libcli/smb/smbXcli_base.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   5    Copyright (C) Stefan Metzmacher 2011
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "system/network.h"
  23 #include "../lib/async_req/async_sock.h"
  24 #include "../lib/util/tevent_ntstatus.h"
  25 #include "../lib/util/tevent_unix.h"
  26 #include "lib/util/util_net.h"
  27 #include "lib/util/dlinklist.h"
  28 #include "lib/util/iov_buf.h"
  29 #include "../libcli/smb/smb_common.h"
  30 #include "../libcli/smb/smb_seal.h"
  31 #include "../libcli/smb/smb_signing.h"
  32 #include "../libcli/smb/read_smb.h"
  33 #include "smbXcli_base.h"
  34 #include "librpc/ndr/libndr.h"
  35 #include "libcli/smb/smb2_negotiate_context.h"
  36 #include "lib/crypto/sha512.h"
  37 #include "lib/crypto/aes.h"
  38 #include "lib/crypto/aes_ccm_128.h"
  39 #include "lib/crypto/aes_gcm_128.h"
  40
  41 struct smbXcli_conn;
  42 struct smbXcli_req;
  43 struct smbXcli_session;
  44 struct smbXcli_tcon;
  45
  46 struct smbXcli_conn {
  47         int sock_fd;
  48         struct sockaddr_storage local_ss;
  49         struct sockaddr_storage remote_ss;
  50         const char *remote_name;
  51
  52         struct tevent_queue *outgoing;
  53         struct tevent_req **pending;
  54         struct tevent_req *read_smb_req;
  55         struct tevent_req *suicide_req;
  56
  57         enum protocol_types min_protocol;
  58         enum protocol_types max_protocol;
  59         enum protocol_types protocol;
  60         bool allow_signing;
  61         bool desire_signing;
  62         bool mandatory_signing;
  63
  64         /*
  65          * The incoming dispatch function should return:
  66          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
  67          * - NT_STATUS_OK, if no more processing is desired, e.g.
  68          *                 the dispatch function called
  69          *                 tevent_req_done().
  70          * - All other return values disconnect the connection.
  71          */
  72         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
  73                                       TALLOC_CTX *tmp_mem,
  74                                       uint8_t *inbuf);
  75
  76         struct {
  77                 struct {
  78                         uint32_t capabilities;
  79                         uint32_t max_xmit;
  80                 } client;
  81
  82                 struct {
  83                         uint32_t capabilities;
  84                         uint32_t max_xmit;
  85                         uint16_t max_mux;
  86                         uint16_t security_mode;
  87                         bool readbraw;
  88                         bool writebraw;
  89                         bool lockread;
  90                         bool writeunlock;
  91                         uint32_t session_key;
  92                         struct GUID guid;
  93                         DATA_BLOB gss_blob;
  94                         uint8_t challenge[8];
  95                         const char *workgroup;
  96                         const char *name;
  97                         int time_zone;
  98                         NTTIME system_time;
  99                 } server;
 100
 101                 uint32_t capabilities;
 102                 uint32_t max_xmit;
 103
 104                 uint16_t mid;
 105
 106                 struct smb_signing_state *signing;
 107                 struct smb_trans_enc_state *trans_enc;
 108
 109                 struct tevent_req *read_braw_req;
 110         } smb1;
 111
 112         struct {
 113                 struct {
 114                         uint32_t capabilities;
 115                         uint16_t security_mode;
 116                         struct GUID guid;
 117                 } client;
 118
 119                 struct {
 120                         uint32_t capabilities;
 121                         uint16_t security_mode;
 122                         struct GUID guid;
 123                         uint32_t max_trans_size;
 124                         uint32_t max_read_size;
 125                         uint32_t max_write_size;
 126                         NTTIME system_time;
 127                         NTTIME start_time;
 128                         DATA_BLOB gss_blob;
 129                         uint16_t cipher;
 130                 } server;
 131
 132                 uint64_t mid;
 133                 uint16_t cur_credits;
 134                 uint16_t max_credits;
 135
 136                 uint32_t cc_chunk_len;
 137                 uint32_t cc_max_chunks;
 138
 139                 uint8_t io_priority;
 140
 141                 uint8_t preauth_sha512[64];
 142         } smb2;
 143
 144         struct smbXcli_session *sessions;
 145 };
 146
 147 struct smb2cli_session {
 148         uint64_t session_id;
 149         uint16_t session_flags;
 150         DATA_BLOB application_key;
 151         DATA_BLOB signing_key;
 152         bool should_sign;
 153         bool should_encrypt;
 154         DATA_BLOB encryption_key;
 155         DATA_BLOB decryption_key;
 156         uint64_t nonce_high_random;
 157         uint64_t nonce_high_max;
 158         uint64_t nonce_high;
 159         uint64_t nonce_low;
 160         uint16_t channel_sequence;
 161         bool replay_active;
 162 };
 163
 164 struct smbXcli_session {
 165         struct smbXcli_session *prev, *next;
 166         struct smbXcli_conn *conn;
 167
 168         struct {
 169                 uint16_t session_id;
 170                 DATA_BLOB application_key;
 171                 bool protected_key;
 172         } smb1;
 173
 174         struct smb2cli_session *smb2;
 175
 176         struct {
 177                 DATA_BLOB signing_key;
 178                 uint8_t preauth_sha512[64];
 179         } smb2_channel;
 180
 181         /*
 182          * this should be a short term hack
 183          * until the upper layers have implemented
 184          * re-authentication.
 185          */
 186         bool disconnect_expired;
 187 };
 188
 189 struct smbXcli_tcon {
 190         bool is_smb1;
 191         uint32_t fs_attributes;
 192
 193         struct {
 194                 uint16_t tcon_id;
 195                 uint16_t optional_support;
 196                 uint32_t maximal_access;
 197                 uint32_t guest_maximal_access;
 198                 char *service;
 199                 char *fs_type;
 200         } smb1;
 201
 202         struct {
 203                 uint32_t tcon_id;
 204                 uint8_t type;
 205                 uint32_t flags;
 206                 uint32_t capabilities;
 207                 uint32_t maximal_access;
 208                 bool should_sign;
 209                 bool should_encrypt;
 210         } smb2;
 211 };
 212
 213 struct smbXcli_req_state {
 214         struct tevent_context *ev;
 215         struct smbXcli_conn *conn;
 216         struct smbXcli_session *session; /* maybe NULL */
 217         struct smbXcli_tcon *tcon; /* maybe NULL */
 218
 219         uint8_t length_hdr[4];
 220
 221         bool one_way;
 222
 223         uint8_t *inbuf;
 224
 225         struct tevent_req *write_req;
 226
 227         struct {
 228                 /* Space for the header including the wct */
 229                 uint8_t hdr[HDR_VWV];
 230
 231                 /*
 232                  * For normal requests, smb1cli_req_send chooses a mid.
 233                  * SecondaryV trans requests need to use the mid of the primary
 234                  * request, so we need a place to store it.
 235                  * Assume it is set if != 0.
 236                  */
 237                 uint16_t mid;
 238
 239                 uint16_t *vwv;
 240                 uint8_t bytecount_buf[2];
 241
 242 #define MAX_SMB_IOV 10
 243                 /* length_hdr, hdr, words, byte_count, buffers */
 244                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 245                 int iov_count;
 246
 247                 bool one_way_seqnum;
 248                 uint32_t seqnum;
 249                 struct tevent_req **chained_requests;
 250
 251                 uint8_t recv_cmd;
 252                 NTSTATUS recv_status;
 253                 /* always an array of 3 talloc elements */
 254                 struct iovec *recv_iov;
 255         } smb1;
 256
 257         struct {
 258                 const uint8_t *fixed;
 259                 uint16_t fixed_len;
 260                 const uint8_t *dyn;
 261                 uint32_t dyn_len;
 262
 263                 uint8_t transform[SMB2_TF_HDR_SIZE];
 264                 uint8_t hdr[SMB2_HDR_BODY];
 265                 uint8_t pad[7]; /* padding space for compounding */
 266
 267                 /*
 268                  * always an array of 3 talloc elements
 269                  * (without a SMB2_TRANSFORM header!)
 270                  *
 271                  * HDR, BODY, DYN
 272                  */
 273                 struct iovec *recv_iov;
 274
 275                 /*
 276                  * the expected max for the response dyn_len
 277                  */
 278                 uint32_t max_dyn_len;
 279
 280                 uint16_t credit_charge;
 281
 282                 bool should_sign;
 283                 bool should_encrypt;
 284                 uint64_t encryption_session_id;
 285
 286                 bool signing_skipped;
 287                 bool notify_async;
 288                 bool got_async;
 289                 uint16_t cancel_flags;
 290                 uint64_t cancel_mid;
 291                 uint64_t cancel_aid;
 292         } smb2;
 293 };
 294
 295 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 296 {
 297         /*
 298          * NT_STATUS_OK, means we do not notify the callers
 299          */
 300         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 301
 302         while (conn->sessions) {
 303                 conn->sessions->conn = NULL;
 304                 DLIST_REMOVE(conn->sessions, conn->sessions);
 305         }
 306
 307         if (conn->smb1.trans_enc) {
 308                 TALLOC_FREE(conn->smb1.trans_enc);
 309         }
 310
 311         return 0;
 312 }
 313
 314 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 315                                          int fd,
 316                                          const char *remote_name,
 317                                          enum smb_signing_setting signing_state,
 318                                          uint32_t smb1_capabilities,
 319                                          struct GUID *client_guid,
 320                                          uint32_t smb2_capabilities)
 321 {
 322         struct smbXcli_conn *conn = NULL;
 323         void *ss = NULL;
 324         struct sockaddr *sa = NULL;
 325         socklen_t sa_length;
 326         int ret;
 327
 328         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 329         if (!conn) {
 330                 return NULL;
 331         }
 332
 333         conn->sock_fd = fd;
 334
 335         conn->remote_name = talloc_strdup(conn, remote_name);
 336         if (conn->remote_name == NULL) {
 337                 goto error;
 338         }
 339
 340         ss = (void *)&conn->local_ss;
 341         sa = (struct sockaddr *)ss;
 342         sa_length = sizeof(conn->local_ss);
 343         ret = getsockname(fd, sa, &sa_length);
 344         if (ret == -1) {
 345                 goto error;
 346         }
 347         ss = (void *)&conn->remote_ss;
 348         sa = (struct sockaddr *)ss;
 349         sa_length = sizeof(conn->remote_ss);
 350         ret = getpeername(fd, sa, &sa_length);
 351         if (ret == -1) {
 352                 goto error;
 353         }
 354
 355         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 356         if (conn->outgoing == NULL) {
 357                 goto error;
 358         }
 359         conn->pending = NULL;
 360
 361         conn->min_protocol = PROTOCOL_NONE;
 362         conn->max_protocol = PROTOCOL_NONE;
 363         conn->protocol = PROTOCOL_NONE;
 364
 365         switch (signing_state) {
 366         case SMB_SIGNING_OFF:
 367                 /* never */
 368                 conn->allow_signing = false;
 369                 conn->desire_signing = false;
 370                 conn->mandatory_signing = false;
 371                 break;
 372         case SMB_SIGNING_DEFAULT:
 373         case SMB_SIGNING_IF_REQUIRED:
 374                 /* if the server requires it */
 375                 conn->allow_signing = true;
 376                 conn->desire_signing = false;
 377                 conn->mandatory_signing = false;
 378                 break;
 379         case SMB_SIGNING_DESIRED:
 380                 /* if the server desires it */
 381                 conn->allow_signing = true;
 382                 conn->desire_signing = true;
 383                 conn->mandatory_signing = false;
 384                 break;
 385         case SMB_SIGNING_REQUIRED:
 386                 /* always */
 387                 conn->allow_signing = true;
 388                 conn->desire_signing = true;
 389                 conn->mandatory_signing = true;
 390                 break;
 391         }
 392
 393         conn->smb1.client.capabilities = smb1_capabilities;
 394         conn->smb1.client.max_xmit = UINT16_MAX;
 395
 396         conn->smb1.capabilities = conn->smb1.client.capabilities;
 397         conn->smb1.max_xmit = 1024;
 398
 399         conn->smb1.mid = 1;
 400
 401         /* initialise signing */
 402         conn->smb1.signing = smb_signing_init(conn,
 403                                               conn->allow_signing,
 404                                               conn->desire_signing,
 405                                               conn->mandatory_signing);
 406         if (!conn->smb1.signing) {
 407                 goto error;
 408         }
 409
 410         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 411         if (conn->mandatory_signing) {
 412                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 413         }
 414         if (client_guid) {
 415                 conn->smb2.client.guid = *client_guid;
 416         }
 417         conn->smb2.client.capabilities = smb2_capabilities;
 418
 419         conn->smb2.cur_credits = 1;
 420         conn->smb2.max_credits = 0;
 421         conn->smb2.io_priority = 1;
 422
 423         /*
 424          * Samba and Windows servers accept a maximum of 16 MiB with a maximum
 425          * chunk length of 1 MiB.
 426          */
 427         conn->smb2.cc_chunk_len = 1024 * 1024;
 428         conn->smb2.cc_max_chunks = 16;
 429
 430         talloc_set_destructor(conn, smbXcli_conn_destructor);
 431         return conn;
 432
 433  error:
 434         TALLOC_FREE(conn);
 435         return NULL;
 436 }
 437
 438 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 439 {
 440         if (conn == NULL) {
 441                 return false;
 442         }
 443
 444         if (conn->sock_fd == -1) {
 445                 return false;
 446         }
 447
 448         return true;
 449 }
 450
 451 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 452 {
 453         return conn->protocol;
 454 }
 455
 456 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 457 {
 458         if (conn->protocol >= PROTOCOL_SMB2_02) {
 459                 return true;
 460         }
 461
 462         if (conn->smb1.capabilities & CAP_UNICODE) {
 463                 return true;
 464         }
 465
 466         return false;
 467 }
 468
 469 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 470 {
 471         set_socket_options(conn->sock_fd, options);
 472 }
 473
 474 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 475 {
 476         return &conn->local_ss;
 477 }
 478
 479 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 480 {
 481         return &conn->remote_ss;
 482 }
 483
 484 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 485 {
 486         return conn->remote_name;
 487 }
 488
 489 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 490 {
 491         if (conn->protocol >= PROTOCOL_SMB2_02) {
 492                 /*
 493                  * TODO...
 494                  */
 495                 return 1;
 496         }
 497
 498         return conn->smb1.server.max_mux;
 499 }
 500
 501 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 502 {
 503         if (conn->protocol >= PROTOCOL_SMB2_02) {
 504                 return conn->smb2.server.system_time;
 505         }
 506
 507         return conn->smb1.server.system_time;
 508 }
 509
 510 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 511 {
 512         if (conn->protocol >= PROTOCOL_SMB2_02) {
 513                 return &conn->smb2.server.gss_blob;
 514         }
 515
 516         return &conn->smb1.server.gss_blob;
 517 }
 518
 519 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 520 {
 521         if (conn->protocol >= PROTOCOL_SMB2_02) {
 522                 return &conn->smb2.server.guid;
 523         }
 524
 525         return &conn->smb1.server.guid;
 526 }
 527
 528 struct smbXcli_conn_samba_suicide_state {
 529         struct smbXcli_conn *conn;
 530         struct iovec iov;
 531         uint8_t buf[9];
 532         struct tevent_req *write_req;
 533 };
 534
 535 static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req,
 536                                                enum tevent_req_state req_state);
 537 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq);
 538
 539 struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx,
 540                                                    struct tevent_context *ev,
 541                                                    struct smbXcli_conn *conn,
 542                                                    uint8_t exitcode)
 543 {
 544         struct tevent_req *req, *subreq;
 545         struct smbXcli_conn_samba_suicide_state *state;
 546
 547         req = tevent_req_create(mem_ctx, &state,
 548                                 struct smbXcli_conn_samba_suicide_state);
 549         if (req == NULL) {
 550                 return NULL;
 551         }
 552         state->conn = conn;
 553         SIVAL(state->buf, 4, 0x74697865);
 554         SCVAL(state->buf, 8, exitcode);
 555         _smb_setlen_nbt(state->buf, sizeof(state->buf)-4);
 556
 557         if (conn->suicide_req != NULL) {
 558                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER);
 559                 return tevent_req_post(req, ev);
 560         }
 561
 562         state->iov.iov_base = state->buf;
 563         state->iov.iov_len = sizeof(state->buf);
 564
 565         subreq = writev_send(state, ev, conn->outgoing, conn->sock_fd,
 566                              false, &state->iov, 1);
 567         if (tevent_req_nomem(subreq, req)) {
 568                 return tevent_req_post(req, ev);
 569         }
 570         tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req);
 571         state->write_req = subreq;
 572
 573         tevent_req_set_cleanup_fn(req, smbXcli_conn_samba_suicide_cleanup);
 574
 575         /*
 576          * We need to use tevent_req_defer_callback()
 577          * in order to allow smbXcli_conn_disconnect()
 578          * to do a safe cleanup.
 579          */
 580         tevent_req_defer_callback(req, ev);
 581         conn->suicide_req = req;
 582
 583         return req;
 584 }
 585
 586 static void smbXcli_conn_samba_suicide_cleanup(struct tevent_req *req,
 587                                                enum tevent_req_state req_state)
 588 {
 589         struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
 590                 req, struct smbXcli_conn_samba_suicide_state);
 591
 592         TALLOC_FREE(state->write_req);
 593
 594         if (state->conn == NULL) {
 595                 return;
 596         }
 597
 598         if (state->conn->suicide_req == req) {
 599                 state->conn->suicide_req = NULL;
 600         }
 601         state->conn = NULL;
 602 }
 603
 604 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq)
 605 {
 606         struct tevent_req *req = tevent_req_callback_data(
 607                 subreq, struct tevent_req);
 608         struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
 609                 req, struct smbXcli_conn_samba_suicide_state);
 610         ssize_t nwritten;
 611         int err;
 612
 613         state->write_req = NULL;
 614
 615         nwritten = writev_recv(subreq, &err);
 616         TALLOC_FREE(subreq);
 617         if (nwritten == -1) {
 618                 /* here, we need to notify all pending requests */
 619                 NTSTATUS status = map_nt_error_from_unix_common(err);
 620                 smbXcli_conn_disconnect(state->conn, status);
 621                 return;
 622         }
 623         tevent_req_done(req);
 624 }
 625
 626 NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req)
 627 {
 628         return tevent_req_simple_recv_ntstatus(req);
 629 }
 630
 631 NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn,
 632                                     uint8_t exitcode)
 633 {
 634         TALLOC_CTX *frame = talloc_stackframe();
 635         struct tevent_context *ev;
 636         struct tevent_req *req;
 637         NTSTATUS status = NT_STATUS_NO_MEMORY;
 638         bool ok;
 639
 640         if (smbXcli_conn_has_async_calls(conn)) {
 641                 /*
 642                  * Can't use sync call while an async call is in flight
 643                  */
 644                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 645                 goto fail;
 646         }
 647         ev = samba_tevent_context_init(frame);
 648         if (ev == NULL) {
 649                 goto fail;
 650         }
 651         req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode);
 652         if (req == NULL) {
 653                 goto fail;
 654         }
 655         ok = tevent_req_poll_ntstatus(req, ev, &status);
 656         if (!ok) {
 657                 goto fail;
 658         }
 659         status = smbXcli_conn_samba_suicide_recv(req);
 660  fail:
 661         TALLOC_FREE(frame);
 662         return status;
 663 }
 664
 665 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 666 {
 667         return conn->smb1.capabilities;
 668 }
 669
 670 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 671 {
 672         return conn->smb1.max_xmit;
 673 }
 674
 675 bool smb1cli_conn_req_possible(struct smbXcli_conn *conn)
 676 {
 677         size_t pending = talloc_array_length(conn->pending);
 678         uint16_t possible = conn->smb1.server.max_mux;
 679
 680         if (pending >= possible) {
 681                 return false;
 682         }
 683
 684         return true;
 685 }
 686
 687 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 688 {
 689         return conn->smb1.server.session_key;
 690 }
 691
 692 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 693 {
 694         return conn->smb1.server.challenge;
 695 }
 696
 697 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 698 {
 699         return conn->smb1.server.security_mode;
 700 }
 701
 702 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
 703 {
 704         return conn->smb1.server.readbraw;
 705 }
 706
 707 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
 708 {
 709         return conn->smb1.server.writebraw;
 710 }
 711
 712 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
 713 {
 714         return conn->smb1.server.lockread;
 715 }
 716
 717 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
 718 {
 719         return conn->smb1.server.writeunlock;
 720 }
 721
 722 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 723 {
 724         return conn->smb1.server.time_zone;
 725 }
 726
 727 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 728                                    const DATA_BLOB user_session_key,
 729                                    const DATA_BLOB response)
 730 {
 731         return smb_signing_activate(conn->smb1.signing,
 732                                     user_session_key,
 733                                     response);
 734 }
 735
 736 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 737                                 const uint8_t *buf, uint32_t seqnum)
 738 {
 739         const uint8_t *hdr = buf + NBT_HDR_SIZE;
 740         size_t len = smb_len_nbt(buf);
 741
 742         return smb_signing_check_pdu(conn->smb1.signing, hdr, len, seqnum);
 743 }
 744
 745 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 746 {
 747         return smb_signing_is_active(conn->smb1.signing);
 748 }
 749
 750 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 751                                  struct smb_trans_enc_state *es)
 752 {
 753         /* Replace the old state, if any. */
 754         if (conn->smb1.trans_enc) {
 755                 TALLOC_FREE(conn->smb1.trans_enc);
 756         }
 757         conn->smb1.trans_enc = es;
 758 }
 759
 760 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 761 {
 762         return common_encryption_on(conn->smb1.trans_enc);
 763 }
 764
 765
 766 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 767 {
 768         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 769         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 770
 771         if (NT_STATUS_IS_OK(status)) {
 772                 return NT_STATUS_OK;
 773         }
 774
 775         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 776                 return status;
 777         }
 778
 779         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 780 }
 781
 782 /**
 783  * Is the SMB command able to hold an AND_X successor
 784  * @param[in] cmd       The SMB command in question
 785  * @retval Can we add a chained request after "cmd"?
 786  */
 787 bool smb1cli_is_andx_req(uint8_t cmd)
 788 {
 789         switch (cmd) {
 790         case SMBtconX:
 791         case SMBlockingX:
 792         case SMBopenX:
 793         case SMBreadX:
 794         case SMBwriteX:
 795         case SMBsesssetupX:
 796         case SMBulogoffX:
 797         case SMBntcreateX:
 798                 return true;
 799                 break;
 800         default:
 801                 break;
 802         }
 803
 804         return false;
 805 }
 806
 807 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 808 {
 809         size_t num_pending = talloc_array_length(conn->pending);
 810         uint16_t result;
 811
 812         if (conn->protocol == PROTOCOL_NONE) {
 813                 /*
 814                  * This is what windows sends on the SMB1 Negprot request
 815                  * and some vendors reuse the SMB1 MID as SMB2 sequence number.
 816                  */
 817                 return 0;
 818         }
 819
 820         while (true) {
 821                 size_t i;
 822
 823                 result = conn->smb1.mid++;
 824                 if ((result == 0) || (result == 0xffff)) {
 825                         continue;
 826                 }
 827
 828                 for (i=0; i<num_pending; i++) {
 829                         if (result == smb1cli_req_mid(conn->pending[i])) {
 830                                 break;
 831                         }
 832                 }
 833
 834                 if (i == num_pending) {
 835                         return result;
 836                 }
 837         }
 838 }
 839
 840 void smbXcli_req_unset_pending(struct tevent_req *req)
 841 {
 842         struct smbXcli_req_state *state =
 843                 tevent_req_data(req,
 844                 struct smbXcli_req_state);
 845         struct smbXcli_conn *conn = state->conn;
 846         size_t num_pending = talloc_array_length(conn->pending);
 847         size_t i;
 848
 849         TALLOC_FREE(state->write_req);
 850
 851         if (state->smb1.mid != 0) {
 852                 /*
 853                  * This is a [nt]trans[2] request which waits
 854                  * for more than one reply.
 855                  */
 856                 return;
 857         }
 858
 859         tevent_req_set_cleanup_fn(req, NULL);
 860
 861         if (num_pending == 1) {
 862                 /*
 863                  * The pending read_smb tevent_req is a child of
 864                  * conn->pending. So if nothing is pending anymore, we need to
 865                  * delete the socket read fde.
 866                  */
 867                 TALLOC_FREE(conn->pending);
 868                 conn->read_smb_req = NULL;
 869                 return;
 870         }
 871
 872         for (i=0; i<num_pending; i++) {
 873                 if (req == conn->pending[i]) {
 874                         break;
 875                 }
 876         }
 877         if (i == num_pending) {
 878                 /*
 879                  * Something's seriously broken. Just returning here is the
 880                  * right thing nevertheless, the point of this routine is to
 881                  * remove ourselves from conn->pending.
 882                  */
 883                 return;
 884         }
 885
 886         /*
 887          * Remove ourselves from the conn->pending array
 888          */
 889         for (; i < (num_pending - 1); i++) {
 890                 conn->pending[i] = conn->pending[i+1];
 891         }
 892
 893         /*
 894          * No NULL check here, we're shrinking by sizeof(void *), and
 895          * talloc_realloc just adjusts the size for this.
 896          */
 897         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 898                                        num_pending - 1);
 899         return;
 900 }
 901
 902 static void smbXcli_req_cleanup(struct tevent_req *req,
 903                                 enum tevent_req_state req_state)
 904 {
 905         struct smbXcli_req_state *state =
 906                 tevent_req_data(req,
 907                 struct smbXcli_req_state);
 908
 909         TALLOC_FREE(state->write_req);
 910
 911         switch (req_state) {
 912         case TEVENT_REQ_RECEIVED:
 913                 /*
 914                  * Make sure we really remove it from
 915                  * the pending array on destruction.
 916                  */
 917                 state->smb1.mid = 0;
 918                 smbXcli_req_unset_pending(req);
 919                 return;
 920         default:
 921                 return;
 922         }
 923 }
 924
 925 static bool smb1cli_req_cancel(struct tevent_req *req);
 926 static bool smb2cli_req_cancel(struct tevent_req *req);
 927
 928 static bool smbXcli_req_cancel(struct tevent_req *req)
 929 {
 930         struct smbXcli_req_state *state =
 931                 tevent_req_data(req,
 932                 struct smbXcli_req_state);
 933
 934         if (!smbXcli_conn_is_connected(state->conn)) {
 935                 return false;
 936         }
 937
 938         if (state->conn->protocol == PROTOCOL_NONE) {
 939                 return false;
 940         }
 941
 942         if (state->conn->protocol >= PROTOCOL_SMB2_02) {
 943                 return smb2cli_req_cancel(req);
 944         }
 945
 946         return smb1cli_req_cancel(req);
 947 }
 948
 949 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 950
 951 bool smbXcli_req_set_pending(struct tevent_req *req)
 952 {
 953         struct smbXcli_req_state *state =
 954                 tevent_req_data(req,
 955                 struct smbXcli_req_state);
 956         struct smbXcli_conn *conn;
 957         struct tevent_req **pending;
 958         size_t num_pending;
 959
 960         conn = state->conn;
 961
 962         if (!smbXcli_conn_is_connected(conn)) {
 963                 return false;
 964         }
 965
 966         num_pending = talloc_array_length(conn->pending);
 967
 968         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 969                                  num_pending+1);
 970         if (pending == NULL) {
 971                 return false;
 972         }
 973         pending[num_pending] = req;
 974         conn->pending = pending;
 975         tevent_req_set_cleanup_fn(req, smbXcli_req_cleanup);
 976         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
 977
 978         if (!smbXcli_conn_receive_next(conn)) {
 979                 /*
 980                  * the caller should notify the current request
 981                  *
 982                  * And all other pending requests get notified
 983                  * by smbXcli_conn_disconnect().
 984                  */
 985                 smbXcli_req_unset_pending(req);
 986                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 987                 return false;
 988         }
 989
 990         return true;
 991 }
 992
 993 static void smbXcli_conn_received(struct tevent_req *subreq);
 994
 995 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 996 {
 997         size_t num_pending = talloc_array_length(conn->pending);
 998         struct tevent_req *req;
 999         struct smbXcli_req_state *state;
1000
1001         if (conn->read_smb_req != NULL) {
1002                 return true;
1003         }
1004
1005         if (num_pending == 0) {
1006                 if (conn->smb2.mid < UINT64_MAX) {
1007                         /* no more pending requests, so we are done for now */
1008                         return true;
1009                 }
1010
1011                 /*
1012                  * If there are no more SMB2 requests possible,
1013                  * because we are out of message ids,
1014                  * we need to disconnect.
1015                  */
1016                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
1017                 return true;
1018         }
1019
1020         req = conn->pending[0];
1021         state = tevent_req_data(req, struct smbXcli_req_state);
1022
1023         /*
1024          * We're the first ones, add the read_smb request that waits for the
1025          * answer from the server
1026          */
1027         conn->read_smb_req = read_smb_send(conn->pending,
1028                                            state->ev,
1029                                            conn->sock_fd);
1030         if (conn->read_smb_req == NULL) {
1031                 return false;
1032         }
1033         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
1034         return true;
1035 }
1036
1037 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
1038 {
1039         struct smbXcli_session *session;
1040         int sock_fd = conn->sock_fd;
1041
1042         tevent_queue_stop(conn->outgoing);
1043
1044         conn->sock_fd = -1;
1045
1046         session = conn->sessions;
1047         if (talloc_array_length(conn->pending) == 0) {
1048                 /*
1049                  * if we do not have pending requests
1050                  * there is no need to update the channel_sequence
1051                  */
1052                 session = NULL;
1053         }
1054         for (; session; session = session->next) {
1055                 smb2cli_session_increment_channel_sequence(session);
1056         }
1057
1058         if (conn->suicide_req != NULL) {
1059                 /*
1060                  * smbXcli_conn_samba_suicide_send()
1061                  * used tevent_req_defer_callback() already.
1062                  */
1063                 if (!NT_STATUS_IS_OK(status)) {
1064                         tevent_req_nterror(conn->suicide_req, status);
1065                 }
1066                 conn->suicide_req = NULL;
1067         }
1068
1069         /*
1070          * Cancel all pending requests. We do not do a for-loop walking
1071          * conn->pending because that array changes in
1072          * smbXcli_req_unset_pending.
1073          */
1074         while (talloc_array_length(conn->pending) > 0) {
1075                 struct tevent_req *req;
1076                 struct smbXcli_req_state *state;
1077                 struct tevent_req **chain;
1078                 size_t num_chained;
1079                 size_t i;
1080
1081                 req = conn->pending[0];
1082                 state = tevent_req_data(req, struct smbXcli_req_state);
1083
1084                 if (state->smb1.chained_requests == NULL) {
1085                         /*
1086                          * We're dead. No point waiting for trans2
1087                          * replies.
1088                          */
1089                         state->smb1.mid = 0;
1090
1091                         smbXcli_req_unset_pending(req);
1092
1093                         if (NT_STATUS_IS_OK(status)) {
1094                                 /* do not notify the callers */
1095                                 continue;
1096                         }
1097
1098                         /*
1099                          * we need to defer the callback, because we may notify
1100                          * more then one caller.
1101                          */
1102                         tevent_req_defer_callback(req, state->ev);
1103                         tevent_req_nterror(req, status);
1104                         continue;
1105                 }
1106
1107                 chain = talloc_move(conn, &state->smb1.chained_requests);
1108                 num_chained = talloc_array_length(chain);
1109
1110                 for (i=0; i<num_chained; i++) {
1111                         req = chain[i];
1112                         state = tevent_req_data(req, struct smbXcli_req_state);
1113
1114                         /*
1115                          * We're dead. No point waiting for trans2
1116                          * replies.
1117                          */
1118                         state->smb1.mid = 0;
1119
1120                         smbXcli_req_unset_pending(req);
1121
1122                         if (NT_STATUS_IS_OK(status)) {
1123                                 /* do not notify the callers */
1124                                 continue;
1125                         }
1126
1127                         /*
1128                          * we need to defer the callback, because we may notify
1129                          * more than one caller.
1130                          */
1131                         tevent_req_defer_callback(req, state->ev);
1132                         tevent_req_nterror(req, status);
1133                 }
1134                 TALLOC_FREE(chain);
1135         }
1136
1137         if (sock_fd != -1) {
1138                 close(sock_fd);
1139         }
1140 }
1141
1142 /*
1143  * Fetch a smb request's mid. Only valid after the request has been sent by
1144  * smb1cli_req_send().
1145  */
1146 uint16_t smb1cli_req_mid(struct tevent_req *req)
1147 {
1148         struct smbXcli_req_state *state =
1149                 tevent_req_data(req,
1150                 struct smbXcli_req_state);
1151
1152         if (state->smb1.mid != 0) {
1153                 return state->smb1.mid;
1154         }
1155
1156         return SVAL(state->smb1.hdr, HDR_MID);
1157 }
1158
1159 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
1160 {
1161         struct smbXcli_req_state *state =
1162                 tevent_req_data(req,
1163                 struct smbXcli_req_state);
1164
1165         state->smb1.mid = mid;
1166 }
1167
1168 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
1169 {
1170         struct smbXcli_req_state *state =
1171                 tevent_req_data(req,
1172                 struct smbXcli_req_state);
1173
1174         return state->smb1.seqnum;
1175 }
1176
1177 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
1178 {
1179         struct smbXcli_req_state *state =
1180                 tevent_req_data(req,
1181                 struct smbXcli_req_state);
1182
1183         state->smb1.seqnum = seqnum;
1184 }
1185
1186 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
1187 {
1188         ssize_t ret = iov_buflen(iov, count);
1189
1190         /* Ignore the overflow case for now ... */
1191         return ret;
1192 }
1193
1194 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
1195                                    const struct iovec *iov,
1196                                    int count)
1197 {
1198         ssize_t buflen;
1199         uint8_t *buf;
1200
1201         buflen = iov_buflen(iov, count);
1202         if (buflen == -1) {
1203                 return NULL;
1204         }
1205
1206         buf = talloc_array(mem_ctx, uint8_t, buflen);
1207         if (buf == NULL) {
1208                 return NULL;
1209         }
1210
1211         iov_buf(iov, count, buf, buflen);
1212
1213         return buf;
1214 }
1215
1216 static void smb1cli_req_flags(enum protocol_types protocol,
1217                               uint32_t smb1_capabilities,
1218                               uint8_t smb_command,
1219                               uint8_t additional_flags,
1220                               uint8_t clear_flags,
1221                               uint8_t *_flags,
1222                               uint16_t additional_flags2,
1223                               uint16_t clear_flags2,
1224                               uint16_t *_flags2)
1225 {
1226         uint8_t flags = 0;
1227         uint16_t flags2 = 0;
1228
1229         if (protocol >= PROTOCOL_LANMAN1) {
1230                 flags |= FLAG_CASELESS_PATHNAMES;
1231                 flags |= FLAG_CANONICAL_PATHNAMES;
1232         }
1233
1234         if (protocol >= PROTOCOL_LANMAN2) {
1235                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
1236                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
1237         }
1238
1239         if (protocol >= PROTOCOL_NT1) {
1240                 flags2 |= FLAGS2_IS_LONG_NAME;
1241
1242                 if (smb1_capabilities & CAP_UNICODE) {
1243                         flags2 |= FLAGS2_UNICODE_STRINGS;
1244                 }
1245                 if (smb1_capabilities & CAP_STATUS32) {
1246                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
1247                 }
1248                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
1249                         flags2 |= FLAGS2_EXTENDED_SECURITY;
1250                 }
1251         }
1252
1253         flags |= additional_flags;
1254         flags &= ~clear_flags;
1255         flags2 |= additional_flags2;
1256         flags2 &= ~clear_flags2;
1257
1258         *_flags = flags;
1259         *_flags2 = flags2;
1260 }
1261
1262 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
1263
1264 static bool smb1cli_req_cancel(struct tevent_req *req)
1265 {
1266         struct smbXcli_req_state *state =
1267                 tevent_req_data(req,
1268                 struct smbXcli_req_state);
1269         uint8_t flags;
1270         uint16_t flags2;
1271         uint32_t pid;
1272         uint16_t mid;
1273         struct tevent_req *subreq;
1274         NTSTATUS status;
1275
1276         flags = CVAL(state->smb1.hdr, HDR_FLG);
1277         flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
1278         pid  = SVAL(state->smb1.hdr, HDR_PID);
1279         pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
1280         mid = SVAL(state->smb1.hdr, HDR_MID);
1281
1282         subreq = smb1cli_req_create(state, state->ev,
1283                                     state->conn,
1284                                     SMBntcancel,
1285                                     flags, 0,
1286                                     flags2, 0,
1287                                     0, /* timeout */
1288                                     pid,
1289                                     state->tcon,
1290                                     state->session,
1291                                     0, NULL, /* vwv */
1292                                     0, NULL); /* bytes */
1293         if (subreq == NULL) {
1294                 return false;
1295         }
1296         smb1cli_req_set_mid(subreq, mid);
1297
1298         status = smb1cli_req_chain_submit(&subreq, 1);
1299         if (!NT_STATUS_IS_OK(status)) {
1300                 TALLOC_FREE(subreq);
1301                 return false;
1302         }
1303         smb1cli_req_set_mid(subreq, 0);
1304
1305         tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1306
1307         return true;
1308 }
1309
1310 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1311 {
1312         /* we do not care about the result */
1313         TALLOC_FREE(subreq);
1314 }
1315
1316 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1317                                       struct tevent_context *ev,
1318                                       struct smbXcli_conn *conn,
1319                                       uint8_t smb_command,
1320                                       uint8_t additional_flags,
1321                                       uint8_t clear_flags,
1322                                       uint16_t additional_flags2,
1323                                       uint16_t clear_flags2,
1324                                       uint32_t timeout_msec,
1325                                       uint32_t pid,
1326                                       struct smbXcli_tcon *tcon,
1327                                       struct smbXcli_session *session,
1328                                       uint8_t wct, uint16_t *vwv,
1329                                       int iov_count,
1330                                       struct iovec *bytes_iov)
1331 {
1332         struct tevent_req *req;
1333         struct smbXcli_req_state *state;
1334         uint8_t flags = 0;
1335         uint16_t flags2 = 0;
1336         uint16_t uid = 0;
1337         uint16_t tid = 0;
1338         ssize_t num_bytes;
1339
1340         if (iov_count > MAX_SMB_IOV) {
1341                 /*
1342                  * Should not happen :-)
1343                  */
1344                 return NULL;
1345         }
1346
1347         req = tevent_req_create(mem_ctx, &state,
1348                                 struct smbXcli_req_state);
1349         if (req == NULL) {
1350                 return NULL;
1351         }
1352         state->ev = ev;
1353         state->conn = conn;
1354         state->session = session;
1355         state->tcon = tcon;
1356
1357         if (session) {
1358                 uid = session->smb1.session_id;
1359         }
1360
1361         if (tcon) {
1362                 tid = tcon->smb1.tcon_id;
1363
1364                 if (tcon->fs_attributes & FILE_CASE_SENSITIVE_SEARCH) {
1365                         clear_flags |= FLAG_CASELESS_PATHNAMES;
1366                 } else {
1367                         /* Default setting, case insensitive. */
1368                         additional_flags |= FLAG_CASELESS_PATHNAMES;
1369                 }
1370
1371                 if (smbXcli_conn_dfs_supported(conn) &&
1372                     smbXcli_tcon_is_dfs_share(tcon))
1373                 {
1374                         additional_flags2 |= FLAGS2_DFS_PATHNAMES;
1375                 }
1376         }
1377
1378         state->smb1.recv_cmd = 0xFF;
1379         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1380         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1381         if (state->smb1.recv_iov == NULL) {
1382                 TALLOC_FREE(req);
1383                 return NULL;
1384         }
1385
1386         smb1cli_req_flags(conn->protocol,
1387                           conn->smb1.capabilities,
1388                           smb_command,
1389                           additional_flags,
1390                           clear_flags,
1391                           &flags,
1392                           additional_flags2,
1393                           clear_flags2,
1394                           &flags2);
1395
1396         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
1397         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
1398         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
1399         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
1400         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
1401         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1402         SSVAL(state->smb1.hdr, HDR_TID,     tid);
1403         SSVAL(state->smb1.hdr, HDR_PID,     pid);
1404         SSVAL(state->smb1.hdr, HDR_UID,     uid);
1405         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
1406         SCVAL(state->smb1.hdr, HDR_WCT,     wct);
1407
1408         state->smb1.vwv = vwv;
1409
1410         num_bytes = iov_buflen(bytes_iov, iov_count);
1411         if (num_bytes == -1) {
1412                 /*
1413                  * I'd love to add a check for num_bytes<=UINT16_MAX here, but
1414                  * the smbclient->samba connections can lie and transfer more.
1415                  */
1416                 TALLOC_FREE(req);
1417                 return NULL;
1418         }
1419
1420         SSVAL(state->smb1.bytecount_buf, 0, num_bytes);
1421
1422         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1423         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
1424         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1425         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
1426         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1427         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
1428         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1429         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
1430
1431         if (iov_count != 0) {
1432                 memcpy(&state->smb1.iov[4], bytes_iov,
1433                        iov_count * sizeof(*bytes_iov));
1434         }
1435         state->smb1.iov_count = iov_count + 4;
1436
1437         if (timeout_msec > 0) {
1438                 struct timeval endtime;
1439
1440                 endtime = timeval_current_ofs_msec(timeout_msec);
1441                 if (!tevent_req_set_endtime(req, ev, endtime)) {
1442                         return req;
1443                 }
1444         }
1445
1446         switch (smb_command) {
1447         case SMBtranss:
1448         case SMBtranss2:
1449         case SMBnttranss:
1450                 state->one_way = true;
1451                 break;
1452         case SMBntcancel:
1453                 state->one_way = true;
1454                 state->smb1.one_way_seqnum = true;
1455                 break;
1456         case SMBlockingX:
1457                 if ((wct == 8) &&
1458                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1459                         state->one_way = true;
1460                 }
1461                 break;
1462         }
1463
1464         return req;
1465 }
1466
1467 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1468                                    struct iovec *iov, int iov_count,
1469                                    uint32_t *seqnum,
1470                                    bool one_way_seqnum)
1471 {
1472         TALLOC_CTX *frame = NULL;
1473         uint8_t *buf;
1474
1475         /*
1476          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1477          * iovec directly. MD5Update would do that just fine.
1478          */
1479
1480         if (iov_count < 4) {
1481                 return NT_STATUS_INVALID_PARAMETER_MIX;
1482         }
1483         if (iov[0].iov_len != NBT_HDR_SIZE) {
1484                 return NT_STATUS_INVALID_PARAMETER_MIX;
1485         }
1486         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1487                 return NT_STATUS_INVALID_PARAMETER_MIX;
1488         }
1489         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1490                 return NT_STATUS_INVALID_PARAMETER_MIX;
1491         }
1492         if (iov[3].iov_len != sizeof(uint16_t)) {
1493                 return NT_STATUS_INVALID_PARAMETER_MIX;
1494         }
1495
1496         frame = talloc_stackframe();
1497
1498         buf = smbXcli_iov_concat(frame, &iov[1], iov_count - 1);
1499         if (buf == NULL) {
1500                 return NT_STATUS_NO_MEMORY;
1501         }
1502
1503         *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1504                                           one_way_seqnum);
1505         smb_signing_sign_pdu(conn->smb1.signing,
1506                              buf, talloc_get_size(buf),
1507                              *seqnum);
1508         memcpy(iov[1].iov_base, buf, iov[1].iov_len);
1509
1510         TALLOC_FREE(frame);
1511         return NT_STATUS_OK;
1512 }
1513
1514 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1515 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1516                                                TALLOC_CTX *tmp_mem,
1517                                                uint8_t *inbuf);
1518
1519 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1520                                           struct smbXcli_req_state *state,
1521                                           struct iovec *iov, int iov_count)
1522 {
1523         struct tevent_req *subreq;
1524         NTSTATUS status;
1525         uint8_t cmd;
1526         uint16_t mid;
1527         ssize_t nbtlen;
1528
1529         if (!smbXcli_conn_is_connected(state->conn)) {
1530                 return NT_STATUS_CONNECTION_DISCONNECTED;
1531         }
1532
1533         if (state->conn->protocol > PROTOCOL_NT1) {
1534                 return NT_STATUS_REVISION_MISMATCH;
1535         }
1536
1537         if (iov_count < 4) {
1538                 return NT_STATUS_INVALID_PARAMETER_MIX;
1539         }
1540         if (iov[0].iov_len != NBT_HDR_SIZE) {
1541                 return NT_STATUS_INVALID_PARAMETER_MIX;
1542         }
1543         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1544                 return NT_STATUS_INVALID_PARAMETER_MIX;
1545         }
1546         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1547                 return NT_STATUS_INVALID_PARAMETER_MIX;
1548         }
1549         if (iov[3].iov_len != sizeof(uint16_t)) {
1550                 return NT_STATUS_INVALID_PARAMETER_MIX;
1551         }
1552
1553         cmd = CVAL(iov[1].iov_base, HDR_COM);
1554         if (cmd == SMBreadBraw) {
1555                 if (smbXcli_conn_has_async_calls(state->conn)) {
1556                         return NT_STATUS_INVALID_PARAMETER_MIX;
1557                 }
1558                 state->conn->smb1.read_braw_req = req;
1559         }
1560
1561         if (state->smb1.mid != 0) {
1562                 mid = state->smb1.mid;
1563         } else {
1564                 mid = smb1cli_alloc_mid(state->conn);
1565         }
1566         SSVAL(iov[1].iov_base, HDR_MID, mid);
1567
1568         nbtlen = iov_buflen(&iov[1], iov_count-1);
1569         if ((nbtlen == -1) || (nbtlen > 0x1FFFF)) {
1570                 return NT_STATUS_INVALID_PARAMETER_MIX;
1571         }
1572
1573         _smb_setlen_nbt(iov[0].iov_base, nbtlen);
1574
1575         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1576                                     &state->smb1.seqnum,
1577                                     state->smb1.one_way_seqnum);
1578
1579         if (!NT_STATUS_IS_OK(status)) {
1580                 return status;
1581         }
1582
1583         /*
1584          * If we supported multiple encrytion contexts
1585          * here we'd look up based on tid.
1586          */
1587         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1588                 char *buf, *enc_buf;
1589
1590                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1591                 if (buf == NULL) {
1592                         return NT_STATUS_NO_MEMORY;
1593                 }
1594                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1595                                                (char *)buf, &enc_buf);
1596                 TALLOC_FREE(buf);
1597                 if (!NT_STATUS_IS_OK(status)) {
1598                         DEBUG(0, ("Error in encrypting client message: %s\n",
1599                                   nt_errstr(status)));
1600                         return status;
1601                 }
1602                 buf = (char *)talloc_memdup(state, enc_buf,
1603                                             smb_len_nbt(enc_buf)+4);
1604                 SAFE_FREE(enc_buf);
1605                 if (buf == NULL) {
1606                         return NT_STATUS_NO_MEMORY;
1607                 }
1608                 iov[0].iov_base = (void *)buf;
1609                 iov[0].iov_len = talloc_get_size(buf);
1610                 iov_count = 1;
1611         }
1612
1613         if (state->conn->dispatch_incoming == NULL) {
1614                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1615         }
1616
1617         if (!smbXcli_req_set_pending(req)) {
1618                 return NT_STATUS_NO_MEMORY;
1619         }
1620
1621         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1622
1623         subreq = writev_send(state, state->ev, state->conn->outgoing,
1624                              state->conn->sock_fd, false, iov, iov_count);
1625         if (subreq == NULL) {
1626                 return NT_STATUS_NO_MEMORY;
1627         }
1628         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1629         state->write_req = subreq;
1630
1631         return NT_STATUS_OK;
1632 }
1633
1634 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1635                                     struct tevent_context *ev,
1636                                     struct smbXcli_conn *conn,
1637                                     uint8_t smb_command,
1638                                     uint8_t additional_flags,
1639                                     uint8_t clear_flags,
1640                                     uint16_t additional_flags2,
1641                                     uint16_t clear_flags2,
1642                                     uint32_t timeout_msec,
1643                                     uint32_t pid,
1644                                     struct smbXcli_tcon *tcon,
1645                                     struct smbXcli_session *session,
1646                                     uint8_t wct, uint16_t *vwv,
1647                                     uint32_t num_bytes,
1648                                     const uint8_t *bytes)
1649 {
1650         struct tevent_req *req;
1651         struct iovec iov;
1652         NTSTATUS status;
1653
1654         iov.iov_base = discard_const_p(void, bytes);
1655         iov.iov_len = num_bytes;
1656
1657         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1658                                  additional_flags, clear_flags,
1659                                  additional_flags2, clear_flags2,
1660                                  timeout_msec,
1661                                  pid, tcon, session,
1662                                  wct, vwv, 1, &iov);
1663         if (req == NULL) {
1664                 return NULL;
1665         }
1666         if (!tevent_req_is_in_progress(req)) {
1667                 return tevent_req_post(req, ev);
1668         }
1669         status = smb1cli_req_chain_submit(&req, 1);
1670         if (tevent_req_nterror(req, status)) {
1671                 return tevent_req_post(req, ev);
1672         }
1673         return req;
1674 }
1675
1676 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1677 {
1678         struct tevent_req *req =
1679                 tevent_req_callback_data(subreq,
1680                 struct tevent_req);
1681         struct smbXcli_req_state *state =
1682                 tevent_req_data(req,
1683                 struct smbXcli_req_state);
1684         ssize_t nwritten;
1685         int err;
1686
1687         state->write_req = NULL;
1688
1689         nwritten = writev_recv(subreq, &err);
1690         TALLOC_FREE(subreq);
1691         if (nwritten == -1) {
1692                 /* here, we need to notify all pending requests */
1693                 NTSTATUS status = map_nt_error_from_unix_common(err);
1694                 smbXcli_conn_disconnect(state->conn, status);
1695                 return;
1696         }
1697
1698         if (state->one_way) {
1699                 state->inbuf = NULL;
1700                 tevent_req_done(req);
1701                 return;
1702         }
1703 }
1704
1705 static void smbXcli_conn_received(struct tevent_req *subreq)
1706 {
1707         struct smbXcli_conn *conn =
1708                 tevent_req_callback_data(subreq,
1709                 struct smbXcli_conn);
1710         TALLOC_CTX *frame = talloc_stackframe();
1711         NTSTATUS status;
1712         uint8_t *inbuf;
1713         ssize_t received;
1714         int err;
1715
1716         if (subreq != conn->read_smb_req) {
1717                 DEBUG(1, ("Internal error: cli_smb_received called with "
1718                           "unexpected subreq\n"));
1719                 smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR);
1720                 TALLOC_FREE(frame);
1721                 return;
1722         }
1723         conn->read_smb_req = NULL;
1724
1725         received = read_smb_recv(subreq, frame, &inbuf, &err);
1726         TALLOC_FREE(subreq);
1727         if (received == -1) {
1728                 status = map_nt_error_from_unix_common(err);
1729                 smbXcli_conn_disconnect(conn, status);
1730                 TALLOC_FREE(frame);
1731                 return;
1732         }
1733
1734         status = conn->dispatch_incoming(conn, frame, inbuf);
1735         TALLOC_FREE(frame);
1736         if (NT_STATUS_IS_OK(status)) {
1737                 /*
1738                  * We should not do any more processing
1739                  * as the dispatch function called
1740                  * tevent_req_done().
1741                  */
1742                 return;
1743         }
1744
1745         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1746                 /*
1747                  * We got an error, so notify all pending requests
1748                  */
1749                 smbXcli_conn_disconnect(conn, status);
1750                 return;
1751         }
1752
1753         /*
1754          * We got NT_STATUS_RETRY, so we may ask for a
1755          * next incoming pdu.
1756          */
1757         if (!smbXcli_conn_receive_next(conn)) {
1758                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1759         }
1760 }
1761
1762 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1763                                           struct iovec **piov, int *pnum_iov)
1764 {
1765         struct iovec *iov;
1766         int num_iov;
1767         size_t buflen;
1768         size_t taken;
1769         size_t remaining;
1770         uint8_t *hdr;
1771         uint8_t cmd;
1772         uint32_t wct_ofs;
1773         NTSTATUS status;
1774         size_t min_size = MIN_SMB_SIZE;
1775
1776         buflen = smb_len_tcp(buf);
1777         taken = 0;
1778
1779         hdr = buf + NBT_HDR_SIZE;
1780
1781         status = smb1cli_pull_raw_error(hdr);
1782         if (NT_STATUS_IS_ERR(status)) {
1783                 /*
1784                  * This is an ugly hack to support OS/2
1785                  * which skips the byte_count in the DATA block
1786                  * on some error responses.
1787                  *
1788                  * See bug #9096
1789                  */
1790                 min_size -= sizeof(uint16_t);
1791         }
1792
1793         if (buflen < min_size) {
1794                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1795         }
1796
1797         /*
1798          * This returns iovec elements in the following order:
1799          *
1800          * - SMB header
1801          *
1802          * - Parameter Block
1803          * - Data Block
1804          *
1805          * - Parameter Block
1806          * - Data Block
1807          *
1808          * - Parameter Block
1809          * - Data Block
1810          */
1811         num_iov = 1;
1812
1813         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1814         if (iov == NULL) {
1815                 return NT_STATUS_NO_MEMORY;
1816         }
1817         iov[0].iov_base = hdr;
1818         iov[0].iov_len = HDR_WCT;
1819         taken += HDR_WCT;
1820
1821         cmd = CVAL(hdr, HDR_COM);
1822         wct_ofs = HDR_WCT;
1823
1824         while (true) {
1825                 size_t len = buflen - taken;
1826                 struct iovec *cur;
1827                 struct iovec *iov_tmp;
1828                 uint8_t wct;
1829                 uint32_t bcc_ofs;
1830                 uint16_t bcc;
1831                 size_t needed;
1832
1833                 /*
1834                  * we need at least WCT
1835                  */
1836                 needed = sizeof(uint8_t);
1837                 if (len < needed) {
1838                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1839                                    __location__, (int)len, (int)needed));
1840                         goto inval;
1841                 }
1842
1843                 /*
1844                  * Now we check if the specified words are there
1845                  */
1846                 wct = CVAL(hdr, wct_ofs);
1847                 needed += wct * sizeof(uint16_t);
1848                 if (len < needed) {
1849                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1850                                    __location__, (int)len, (int)needed));
1851                         goto inval;
1852                 }
1853
1854                 if ((num_iov == 1) &&
1855                     (len == needed) &&
1856                     NT_STATUS_IS_ERR(status))
1857                 {
1858                         /*
1859                          * This is an ugly hack to support OS/2
1860                          * which skips the byte_count in the DATA block
1861                          * on some error responses.
1862                          *
1863                          * See bug #9096
1864                          */
1865                         iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1866                                                  num_iov + 2);
1867                         if (iov_tmp == NULL) {
1868                                 TALLOC_FREE(iov);
1869                                 return NT_STATUS_NO_MEMORY;
1870                         }
1871                         iov = iov_tmp;
1872                         cur = &iov[num_iov];
1873                         num_iov += 2;
1874
1875                         cur[0].iov_len = 0;
1876                         cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1877                         cur[1].iov_len = 0;
1878                         cur[1].iov_base = cur[0].iov_base;
1879
1880                         taken += needed;
1881                         break;
1882                 }
1883
1884                 /*
1885                  * we need at least BCC
1886                  */
1887                 needed += sizeof(uint16_t);
1888                 if (len < needed) {
1889                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1890                                    __location__, (int)len, (int)needed));
1891                         goto inval;
1892                 }
1893
1894                 /*
1895                  * Now we check if the specified bytes are there
1896                  */
1897                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1898                 bcc = SVAL(hdr, bcc_ofs);
1899                 needed += bcc * sizeof(uint8_t);
1900                 if (len < needed) {
1901                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1902                                    __location__, (int)len, (int)needed));
1903                         goto inval;
1904                 }
1905
1906                 /*
1907                  * we allocate 2 iovec structures for words and bytes
1908                  */
1909                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1910                                          num_iov + 2);
1911                 if (iov_tmp == NULL) {
1912                         TALLOC_FREE(iov);
1913                         return NT_STATUS_NO_MEMORY;
1914                 }
1915                 iov = iov_tmp;
1916                 cur = &iov[num_iov];
1917                 num_iov += 2;
1918
1919                 cur[0].iov_len = wct * sizeof(uint16_t);
1920                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1921                 cur[1].iov_len = bcc * sizeof(uint8_t);
1922                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1923
1924                 taken += needed;
1925
1926                 if (!smb1cli_is_andx_req(cmd)) {
1927                         /*
1928                          * If the current command does not have AndX chanining
1929                          * we are done.
1930                          */
1931                         break;
1932                 }
1933
1934                 if (wct == 0 && bcc == 0) {
1935                         /*
1936                          * An empty response also ends the chain,
1937                          * most likely with an error.
1938                          */
1939                         break;
1940                 }
1941
1942                 if (wct < 2) {
1943                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1944                                    __location__, (int)wct, (int)cmd));
1945                         goto inval;
1946                 }
1947                 cmd = CVAL(cur[0].iov_base, 0);
1948                 if (cmd == 0xFF) {
1949                         /*
1950                          * If it is the end of the chain we are also done.
1951                          */
1952                         break;
1953                 }
1954                 wct_ofs = SVAL(cur[0].iov_base, 2);
1955
1956                 if (wct_ofs < taken) {
1957                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1958                 }
1959                 if (wct_ofs > buflen) {
1960                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1961                 }
1962
1963                 /*
1964                  * we consumed everything up to the start of the next
1965                  * parameter block.
1966                  */
1967                 taken = wct_ofs;
1968         }
1969
1970         remaining = buflen - taken;
1971
1972         if (remaining > 0 && num_iov >= 3) {
1973                 /*
1974                  * The last DATA block gets the remaining
1975                  * bytes, this is needed to support
1976                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1977                  */
1978                 iov[num_iov-1].iov_len += remaining;
1979         }
1980
1981         *piov = iov;
1982         *pnum_iov = num_iov;
1983         return NT_STATUS_OK;
1984
1985 inval:
1986         TALLOC_FREE(iov);
1987         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1988 }
1989
1990 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1991                                                TALLOC_CTX *tmp_mem,
1992                                                uint8_t *inbuf)
1993 {
1994         struct tevent_req *req;
1995         struct smbXcli_req_state *state;
1996         NTSTATUS status;
1997         size_t num_pending;
1998         size_t i;
1999         uint8_t cmd;
2000         uint16_t mid;
2001         bool oplock_break;
2002         uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
2003         size_t len = smb_len_tcp(inbuf);
2004         struct iovec *iov = NULL;
2005         int num_iov = 0;
2006         struct tevent_req **chain = NULL;
2007         size_t num_chained = 0;
2008         size_t num_responses = 0;
2009
2010         if (conn->smb1.read_braw_req != NULL) {
2011                 req = conn->smb1.read_braw_req;
2012                 conn->smb1.read_braw_req = NULL;
2013                 state = tevent_req_data(req, struct smbXcli_req_state);
2014
2015                 smbXcli_req_unset_pending(req);
2016
2017                 if (state->smb1.recv_iov == NULL) {
2018                         /*
2019                          * For requests with more than
2020                          * one response, we have to readd the
2021                          * recv_iov array.
2022                          */
2023                         state->smb1.recv_iov = talloc_zero_array(state,
2024                                                                  struct iovec,
2025                                                                  3);
2026                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2027                                 return NT_STATUS_OK;
2028                         }
2029                 }
2030
2031                 state->smb1.recv_iov[0].iov_base = (void *)(inhdr);
2032                 state->smb1.recv_iov[0].iov_len = len;
2033                 ZERO_STRUCT(state->smb1.recv_iov[1]);
2034                 ZERO_STRUCT(state->smb1.recv_iov[2]);
2035
2036                 state->smb1.recv_cmd = SMBreadBraw;
2037                 state->smb1.recv_status = NT_STATUS_OK;
2038                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2039
2040                 tevent_req_done(req);
2041                 return NT_STATUS_OK;
2042         }
2043
2044         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
2045             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
2046                 DEBUG(10, ("Got non-SMB PDU\n"));
2047                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2048         }
2049
2050         /*
2051          * If we supported multiple encrytion contexts
2052          * here we'd look up based on tid.
2053          */
2054         if (common_encryption_on(conn->smb1.trans_enc)
2055             && (CVAL(inbuf, 0) == 0)) {
2056                 uint16_t enc_ctx_num;
2057
2058                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
2059                 if (!NT_STATUS_IS_OK(status)) {
2060                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
2061                                    nt_errstr(status)));
2062                         return status;
2063                 }
2064
2065                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
2066                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
2067                                    enc_ctx_num,
2068                                    conn->smb1.trans_enc->enc_ctx_num));
2069                         return NT_STATUS_INVALID_HANDLE;
2070                 }
2071
2072                 status = common_decrypt_buffer(conn->smb1.trans_enc,
2073                                                (char *)inbuf);
2074                 if (!NT_STATUS_IS_OK(status)) {
2075                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
2076                                    nt_errstr(status)));
2077                         return status;
2078                 }
2079                 inhdr = inbuf + NBT_HDR_SIZE;
2080                 len = smb_len_nbt(inbuf);
2081         }
2082
2083         mid = SVAL(inhdr, HDR_MID);
2084         num_pending = talloc_array_length(conn->pending);
2085
2086         for (i=0; i<num_pending; i++) {
2087                 if (mid == smb1cli_req_mid(conn->pending[i])) {
2088                         break;
2089                 }
2090         }
2091         if (i == num_pending) {
2092                 /* Dump unexpected reply */
2093                 return NT_STATUS_RETRY;
2094         }
2095
2096         oplock_break = false;
2097
2098         if (mid == 0xffff) {
2099                 /*
2100                  * Paranoia checks that this is really an oplock break request.
2101                  */
2102                 oplock_break = (len == 51); /* hdr + 8 words */
2103                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
2104                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
2105                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
2106                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
2107
2108                 if (!oplock_break) {
2109                         /* Dump unexpected reply */
2110                         return NT_STATUS_RETRY;
2111                 }
2112         }
2113
2114         req = conn->pending[i];
2115         state = tevent_req_data(req, struct smbXcli_req_state);
2116
2117         if (!oplock_break /* oplock breaks are not signed */
2118             && !smb_signing_check_pdu(conn->smb1.signing,
2119                                       inhdr, len, state->smb1.seqnum+1)) {
2120                 DEBUG(10, ("cli_check_sign_mac failed\n"));
2121                 return NT_STATUS_ACCESS_DENIED;
2122         }
2123
2124         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
2125                                            &iov, &num_iov);
2126         if (!NT_STATUS_IS_OK(status)) {
2127                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
2128                           nt_errstr(status)));
2129                 return status;
2130         }
2131
2132         cmd = CVAL(inhdr, HDR_COM);
2133         status = smb1cli_pull_raw_error(inhdr);
2134
2135         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
2136             (state->session != NULL) && state->session->disconnect_expired)
2137         {
2138                 /*
2139                  * this should be a short term hack
2140                  * until the upper layers have implemented
2141                  * re-authentication.
2142                  */
2143                 return status;
2144         }
2145
2146         if (state->smb1.chained_requests == NULL) {
2147                 if (num_iov != 3) {
2148                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2149                 }
2150
2151                 smbXcli_req_unset_pending(req);
2152
2153                 if (state->smb1.recv_iov == NULL) {
2154                         /*
2155                          * For requests with more than
2156                          * one response, we have to readd the
2157                          * recv_iov array.
2158                          */
2159                         state->smb1.recv_iov = talloc_zero_array(state,
2160                                                                  struct iovec,
2161                                                                  3);
2162                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2163                                 return NT_STATUS_OK;
2164                         }
2165                 }
2166
2167                 state->smb1.recv_cmd = cmd;
2168                 state->smb1.recv_status = status;
2169                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2170
2171                 state->smb1.recv_iov[0] = iov[0];
2172                 state->smb1.recv_iov[1] = iov[1];
2173                 state->smb1.recv_iov[2] = iov[2];
2174
2175                 if (talloc_array_length(conn->pending) == 0) {
2176                         tevent_req_done(req);
2177                         return NT_STATUS_OK;
2178                 }
2179
2180                 tevent_req_defer_callback(req, state->ev);
2181                 tevent_req_done(req);
2182                 return NT_STATUS_RETRY;
2183         }
2184
2185         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
2186         num_chained = talloc_array_length(chain);
2187         num_responses = (num_iov - 1)/2;
2188
2189         if (num_responses > num_chained) {
2190                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2191         }
2192
2193         for (i=0; i<num_chained; i++) {
2194                 size_t iov_idx = 1 + (i*2);
2195                 struct iovec *cur = &iov[iov_idx];
2196                 uint8_t *inbuf_ref;
2197
2198                 req = chain[i];
2199                 state = tevent_req_data(req, struct smbXcli_req_state);
2200
2201                 smbXcli_req_unset_pending(req);
2202
2203                 /*
2204                  * as we finish multiple requests here
2205                  * we need to defer the callbacks as
2206                  * they could destroy our current stack state.
2207                  */
2208                 tevent_req_defer_callback(req, state->ev);
2209
2210                 if (i >= num_responses) {
2211                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
2212                         continue;
2213                 }
2214
2215                 if (state->smb1.recv_iov == NULL) {
2216                         /*
2217                          * For requests with more than
2218                          * one response, we have to readd the
2219                          * recv_iov array.
2220                          */
2221                         state->smb1.recv_iov = talloc_zero_array(state,
2222                                                                  struct iovec,
2223                                                                  3);
2224                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2225                                 continue;
2226                         }
2227                 }
2228
2229                 state->smb1.recv_cmd = cmd;
2230
2231                 if (i == (num_responses - 1)) {
2232                         /*
2233                          * The last request in the chain gets the status
2234                          */
2235                         state->smb1.recv_status = status;
2236                 } else {
2237                         cmd = CVAL(cur[0].iov_base, 0);
2238                         state->smb1.recv_status = NT_STATUS_OK;
2239                 }
2240
2241                 state->inbuf = inbuf;
2242
2243                 /*
2244                  * Note: here we use talloc_reference() in a way
2245                  *       that does not expose it to the caller.
2246                  */
2247                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
2248                 if (tevent_req_nomem(inbuf_ref, req)) {
2249                         continue;
2250                 }
2251
2252                 /* copy the related buffers */
2253                 state->smb1.recv_iov[0] = iov[0];
2254                 state->smb1.recv_iov[1] = cur[0];
2255                 state->smb1.recv_iov[2] = cur[1];
2256
2257                 tevent_req_done(req);
2258         }
2259
2260         return NT_STATUS_RETRY;
2261 }
2262
2263 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
2264                           TALLOC_CTX *mem_ctx,
2265                           struct iovec **piov,
2266                           uint8_t **phdr,
2267                           uint8_t *pwct,
2268                           uint16_t **pvwv,
2269                           uint32_t *pvwv_offset,
2270                           uint32_t *pnum_bytes,
2271                           uint8_t **pbytes,
2272                           uint32_t *pbytes_offset,
2273                           uint8_t **pinbuf,
2274                           const struct smb1cli_req_expected_response *expected,
2275                           size_t num_expected)
2276 {
2277         struct smbXcli_req_state *state =
2278                 tevent_req_data(req,
2279                 struct smbXcli_req_state);
2280         NTSTATUS status = NT_STATUS_OK;
2281         struct iovec *recv_iov = NULL;
2282         uint8_t *hdr = NULL;
2283         uint8_t wct = 0;
2284         uint32_t vwv_offset = 0;
2285         uint16_t *vwv = NULL;
2286         uint32_t num_bytes = 0;
2287         uint32_t bytes_offset = 0;
2288         uint8_t *bytes = NULL;
2289         size_t i;
2290         bool found_status = false;
2291         bool found_size = false;
2292
2293         if (piov != NULL) {
2294                 *piov = NULL;
2295         }
2296         if (phdr != NULL) {
2297                 *phdr = 0;
2298         }
2299         if (pwct != NULL) {
2300                 *pwct = 0;
2301         }
2302         if (pvwv != NULL) {
2303                 *pvwv = NULL;
2304         }
2305         if (pvwv_offset != NULL) {
2306                 *pvwv_offset = 0;
2307         }
2308         if (pnum_bytes != NULL) {
2309                 *pnum_bytes = 0;
2310         }
2311         if (pbytes != NULL) {
2312                 *pbytes = NULL;
2313         }
2314         if (pbytes_offset != NULL) {
2315                 *pbytes_offset = 0;
2316         }
2317         if (pinbuf != NULL) {
2318                 *pinbuf = NULL;
2319         }
2320
2321         if (state->inbuf != NULL) {
2322                 recv_iov = state->smb1.recv_iov;
2323                 state->smb1.recv_iov = NULL;
2324                 if (state->smb1.recv_cmd != SMBreadBraw) {
2325                         hdr = (uint8_t *)recv_iov[0].iov_base;
2326                         wct = recv_iov[1].iov_len/2;
2327                         vwv = (uint16_t *)recv_iov[1].iov_base;
2328                         vwv_offset = PTR_DIFF(vwv, hdr);
2329                         num_bytes = recv_iov[2].iov_len;
2330                         bytes = (uint8_t *)recv_iov[2].iov_base;
2331                         bytes_offset = PTR_DIFF(bytes, hdr);
2332                 }
2333         }
2334
2335         if (tevent_req_is_nterror(req, &status)) {
2336                 for (i=0; i < num_expected; i++) {
2337                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2338                                 found_status = true;
2339                                 break;
2340                         }
2341                 }
2342
2343                 if (found_status) {
2344                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2345                 }
2346
2347                 return status;
2348         }
2349
2350         if (num_expected == 0) {
2351                 found_status = true;
2352                 found_size = true;
2353         }
2354
2355         status = state->smb1.recv_status;
2356
2357         for (i=0; i < num_expected; i++) {
2358                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2359                         continue;
2360                 }
2361
2362                 found_status = true;
2363                 if (expected[i].wct == 0) {
2364                         found_size = true;
2365                         break;
2366                 }
2367
2368                 if (expected[i].wct == wct) {
2369                         found_size = true;
2370                         break;
2371                 }
2372         }
2373
2374         if (!found_status) {
2375                 return status;
2376         }
2377
2378         if (!found_size) {
2379                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2380         }
2381
2382         if (piov != NULL) {
2383                 *piov = talloc_move(mem_ctx, &recv_iov);
2384         }
2385
2386         if (phdr != NULL) {
2387                 *phdr = hdr;
2388         }
2389         if (pwct != NULL) {
2390                 *pwct = wct;
2391         }
2392         if (pvwv != NULL) {
2393                 *pvwv = vwv;
2394         }
2395         if (pvwv_offset != NULL) {
2396                 *pvwv_offset = vwv_offset;
2397         }
2398         if (pnum_bytes != NULL) {
2399                 *pnum_bytes = num_bytes;
2400         }
2401         if (pbytes != NULL) {
2402                 *pbytes = bytes;
2403         }
2404         if (pbytes_offset != NULL) {
2405                 *pbytes_offset = bytes_offset;
2406         }
2407         if (pinbuf != NULL) {
2408                 *pinbuf = state->inbuf;
2409         }
2410
2411         return status;
2412 }
2413
2414 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2415 {
2416         size_t wct_ofs;
2417         int i;
2418
2419         wct_ofs = HDR_WCT;
2420
2421         for (i=0; i<num_reqs; i++) {
2422                 struct smbXcli_req_state *state;
2423                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2424                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2425                                            state->smb1.iov_count-2);
2426                 wct_ofs = (wct_ofs + 3) & ~3;
2427         }
2428         return wct_ofs;
2429 }
2430
2431 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2432 {
2433         struct smbXcli_req_state *first_state =
2434                 tevent_req_data(reqs[0],
2435                 struct smbXcli_req_state);
2436         struct smbXcli_req_state *state;
2437         size_t wct_offset;
2438         size_t chain_padding = 0;
2439         int i, iovlen;
2440         struct iovec *iov = NULL;
2441         struct iovec *this_iov;
2442         NTSTATUS status;
2443         ssize_t nbt_len;
2444
2445         if (num_reqs == 1) {
2446                 return smb1cli_req_writev_submit(reqs[0], first_state,
2447                                                  first_state->smb1.iov,
2448                                                  first_state->smb1.iov_count);
2449         }
2450
2451         iovlen = 0;
2452         for (i=0; i<num_reqs; i++) {
2453                 if (!tevent_req_is_in_progress(reqs[i])) {
2454                         return NT_STATUS_INTERNAL_ERROR;
2455                 }
2456
2457                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2458
2459                 if (state->smb1.iov_count < 4) {
2460                         return NT_STATUS_INVALID_PARAMETER_MIX;
2461                 }
2462
2463                 if (i == 0) {
2464                         /*
2465                          * The NBT and SMB header
2466                          */
2467                         iovlen += 2;
2468                 } else {
2469                         /*
2470                          * Chain padding
2471                          */
2472                         iovlen += 1;
2473                 }
2474
2475                 /*
2476                  * words and bytes
2477                  */
2478                 iovlen += state->smb1.iov_count - 2;
2479         }
2480
2481         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2482         if (iov == NULL) {
2483                 return NT_STATUS_NO_MEMORY;
2484         }
2485
2486         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2487                 first_state, reqs, sizeof(*reqs) * num_reqs);
2488         if (first_state->smb1.chained_requests == NULL) {
2489                 TALLOC_FREE(iov);
2490                 return NT_STATUS_NO_MEMORY;
2491         }
2492
2493         wct_offset = HDR_WCT;
2494         this_iov = iov;
2495
2496         for (i=0; i<num_reqs; i++) {
2497                 size_t next_padding = 0;
2498                 uint16_t *vwv;
2499
2500                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2501
2502                 if (i < num_reqs-1) {
2503                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2504                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2505                                 TALLOC_FREE(iov);
2506                                 TALLOC_FREE(first_state->smb1.chained_requests);
2507                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2508                         }
2509                 }
2510
2511                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2512                                               state->smb1.iov_count-2) + 1;
2513                 if ((wct_offset % 4) != 0) {
2514                         next_padding = 4 - (wct_offset % 4);
2515                 }
2516                 wct_offset += next_padding;
2517                 vwv = state->smb1.vwv;
2518
2519                 if (i < num_reqs-1) {
2520                         struct smbXcli_req_state *next_state =
2521                                 tevent_req_data(reqs[i+1],
2522                                 struct smbXcli_req_state);
2523                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2524                         SCVAL(vwv+0, 1, 0);
2525                         SSVAL(vwv+1, 0, wct_offset);
2526                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2527                         /* properly end the chain */
2528                         SCVAL(vwv+0, 0, 0xff);
2529                         SCVAL(vwv+0, 1, 0xff);
2530                         SSVAL(vwv+1, 0, 0);
2531                 }
2532
2533                 if (i == 0) {
2534                         /*
2535                          * The NBT and SMB header
2536                          */
2537                         this_iov[0] = state->smb1.iov[0];
2538                         this_iov[1] = state->smb1.iov[1];
2539                         this_iov += 2;
2540                 } else {
2541                         /*
2542                          * This one is a bit subtle. We have to add
2543                          * chain_padding bytes between the requests, and we
2544                          * have to also include the wct field of the
2545                          * subsequent requests. We use the subsequent header
2546                          * for the padding, it contains the wct field in its
2547                          * last byte.
2548                          */
2549                         this_iov[0].iov_len = chain_padding+1;
2550                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2551                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2552                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2553                         this_iov += 1;
2554                 }
2555
2556                 /*
2557                  * copy the words and bytes
2558                  */
2559                 memcpy(this_iov, state->smb1.iov+2,
2560                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2561                 this_iov += state->smb1.iov_count - 2;
2562                 chain_padding = next_padding;
2563         }
2564
2565         nbt_len = iov_buflen(&iov[1], iovlen-1);
2566         if ((nbt_len == -1) || (nbt_len > first_state->conn->smb1.max_xmit)) {
2567                 TALLOC_FREE(iov);
2568                 TALLOC_FREE(first_state->smb1.chained_requests);
2569                 return NT_STATUS_INVALID_PARAMETER_MIX;
2570         }
2571
2572         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2573         if (!NT_STATUS_IS_OK(status)) {
2574                 TALLOC_FREE(iov);
2575                 TALLOC_FREE(first_state->smb1.chained_requests);
2576                 return status;
2577         }
2578
2579         return NT_STATUS_OK;
2580 }
2581
2582 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2583 {
2584         return ((tevent_queue_length(conn->outgoing) != 0)
2585                 || (talloc_array_length(conn->pending) != 0));
2586 }
2587
2588 bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn)
2589 {
2590         if (conn->protocol >= PROTOCOL_SMB2_02) {
2591                 return (smb2cli_conn_server_capabilities(conn) & SMB2_CAP_DFS);
2592         }
2593
2594         return (smb1cli_conn_capabilities(conn) & CAP_DFS);
2595 }
2596
2597 bool smb2cli_conn_req_possible(struct smbXcli_conn *conn, uint32_t *max_dyn_len)
2598 {
2599         uint16_t credits = 1;
2600
2601         if (conn->smb2.cur_credits == 0) {
2602                 if (max_dyn_len != NULL) {
2603                         *max_dyn_len = 0;
2604                 }
2605                 return false;
2606         }
2607
2608         if (conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2609                 credits = conn->smb2.cur_credits;
2610         }
2611
2612         if (max_dyn_len != NULL) {
2613                 *max_dyn_len = credits * 65536;
2614         }
2615
2616         return true;
2617 }
2618
2619 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2620 {
2621         return conn->smb2.server.capabilities;
2622 }
2623
2624 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2625 {
2626         return conn->smb2.server.security_mode;
2627 }
2628
2629 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2630 {
2631         return conn->smb2.server.max_trans_size;
2632 }
2633
2634 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2635 {
2636         return conn->smb2.server.max_read_size;
2637 }
2638
2639 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2640 {
2641         return conn->smb2.server.max_write_size;
2642 }
2643
2644 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2645                                   uint16_t max_credits)
2646 {
2647         conn->smb2.max_credits = max_credits;
2648 }
2649
2650 uint8_t smb2cli_conn_get_io_priority(struct smbXcli_conn *conn)
2651 {
2652         if (conn->protocol < PROTOCOL_SMB3_11) {
2653                 return 0;
2654         }
2655
2656         return conn->smb2.io_priority;
2657 }
2658
2659 void smb2cli_conn_set_io_priority(struct smbXcli_conn *conn,
2660                                   uint8_t io_priority)
2661 {
2662         conn->smb2.io_priority = io_priority;
2663 }
2664
2665 uint32_t smb2cli_conn_cc_chunk_len(struct smbXcli_conn *conn)
2666 {
2667         return conn->smb2.cc_chunk_len;
2668 }
2669
2670 void smb2cli_conn_set_cc_chunk_len(struct smbXcli_conn *conn,
2671                                     uint32_t chunk_len)
2672 {
2673         conn->smb2.cc_chunk_len = chunk_len;
2674 }
2675
2676 uint32_t smb2cli_conn_cc_max_chunks(struct smbXcli_conn *conn)
2677 {
2678         return conn->smb2.cc_max_chunks;
2679 }
2680
2681 void smb2cli_conn_set_cc_max_chunks(struct smbXcli_conn *conn,
2682                                     uint32_t max_chunks)
2683 {
2684         conn->smb2.cc_max_chunks = max_chunks;
2685 }
2686
2687 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2688
2689 static bool smb2cli_req_cancel(struct tevent_req *req)
2690 {
2691         struct smbXcli_req_state *state =
2692                 tevent_req_data(req,
2693                 struct smbXcli_req_state);
2694         struct smbXcli_tcon *tcon = state->tcon;
2695         struct smbXcli_session *session = state->session;
2696         uint8_t *fixed = state->smb2.pad;
2697         uint16_t fixed_len = 4;
2698         struct tevent_req *subreq;
2699         struct smbXcli_req_state *substate;
2700         NTSTATUS status;
2701
2702         SSVAL(fixed, 0, 0x04);
2703         SSVAL(fixed, 2, 0);
2704
2705         subreq = smb2cli_req_create(state, state->ev,
2706                                     state->conn,
2707                                     SMB2_OP_CANCEL,
2708                                     0, 0, /* flags */
2709                                     0, /* timeout */
2710                                     tcon, session,
2711                                     fixed, fixed_len,
2712                                     NULL, 0, 0);
2713         if (subreq == NULL) {
2714                 return false;
2715         }
2716         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2717
2718         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, state->smb2.cancel_flags);
2719         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, state->smb2.cancel_mid);
2720         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, state->smb2.cancel_aid);
2721
2722         status = smb2cli_req_compound_submit(&subreq, 1);
2723         if (!NT_STATUS_IS_OK(status)) {
2724                 TALLOC_FREE(subreq);
2725                 return false;
2726         }
2727
2728         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2729
2730         return true;
2731 }
2732
2733 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2734 {
2735         /* we do not care about the result */
2736         TALLOC_FREE(subreq);
2737 }
2738
2739 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2740                                       struct tevent_context *ev,
2741                                       struct smbXcli_conn *conn,
2742                                       uint16_t cmd,
2743                                       uint32_t additional_flags,
2744                                       uint32_t clear_flags,
2745                                       uint32_t timeout_msec,
2746                                       struct smbXcli_tcon *tcon,
2747                                       struct smbXcli_session *session,
2748                                       const uint8_t *fixed,
2749                                       uint16_t fixed_len,
2750                                       const uint8_t *dyn,
2751                                       uint32_t dyn_len,
2752                                       uint32_t max_dyn_len)
2753 {
2754         struct tevent_req *req;
2755         struct smbXcli_req_state *state;
2756         uint32_t flags = 0;
2757         uint32_t tid = 0;
2758         uint64_t uid = 0;
2759         bool use_channel_sequence = false;
2760         uint16_t channel_sequence = 0;
2761         bool use_replay_flag = false;
2762
2763         req = tevent_req_create(mem_ctx, &state,
2764                                 struct smbXcli_req_state);
2765         if (req == NULL) {
2766                 return NULL;
2767         }
2768
2769         state->ev = ev;
2770         state->conn = conn;
2771         state->session = session;
2772         state->tcon = tcon;
2773
2774         if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) {
2775                 use_channel_sequence = true;
2776         } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) {
2777                 use_channel_sequence = true;
2778         }
2779
2780         if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_00) {
2781                 use_replay_flag = true;
2782         }
2783
2784         if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_11) {
2785                 flags |= SMB2_PRIORITY_VALUE_TO_MASK(conn->smb2.io_priority);
2786         }
2787
2788         if (session) {
2789                 uid = session->smb2->session_id;
2790
2791                 if (use_channel_sequence) {
2792                         channel_sequence = session->smb2->channel_sequence;
2793                 }
2794
2795                 if (use_replay_flag && session->smb2->replay_active) {
2796                         additional_flags |= SMB2_HDR_FLAG_REPLAY_OPERATION;
2797                 }
2798
2799                 state->smb2.should_sign = session->smb2->should_sign;
2800                 state->smb2.should_encrypt = session->smb2->should_encrypt;
2801
2802                 if (cmd == SMB2_OP_SESSSETUP &&
2803                     session->smb2_channel.signing_key.length == 0 &&
2804                     session->smb2->signing_key.length != 0)
2805                 {
2806                         /*
2807                          * a session bind needs to be signed
2808                          */
2809                         state->smb2.should_sign = true;
2810                 }
2811
2812                 if (cmd == SMB2_OP_SESSSETUP &&
2813                     session->smb2_channel.signing_key.length == 0) {
2814                         state->smb2.should_encrypt = false;
2815                 }
2816
2817                 if (additional_flags & SMB2_HDR_FLAG_SIGNED) {
2818                         if (session->smb2_channel.signing_key.length == 0) {
2819                                 tevent_req_nterror(req, NT_STATUS_NO_USER_SESSION_KEY);
2820                                 return req;
2821                         }
2822
2823                         additional_flags &= ~SMB2_HDR_FLAG_SIGNED;
2824                         state->smb2.should_sign = true;
2825                 }
2826         }
2827
2828         if (tcon) {
2829                 tid = tcon->smb2.tcon_id;
2830
2831                 if (tcon->smb2.should_sign) {
2832                         state->smb2.should_sign = true;
2833                 }
2834                 if (tcon->smb2.should_encrypt) {
2835                         state->smb2.should_encrypt = true;
2836                 }
2837         }
2838
2839         if (state->smb2.should_encrypt) {
2840                 state->smb2.should_sign = false;
2841         }
2842
2843         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2844         if (state->smb2.recv_iov == NULL) {
2845                 TALLOC_FREE(req);
2846                 return NULL;
2847         }
2848
2849         flags |= additional_flags;
2850         flags &= ~clear_flags;
2851
2852         state->smb2.fixed = fixed;
2853         state->smb2.fixed_len = fixed_len;
2854         state->smb2.dyn = dyn;
2855         state->smb2.dyn_len = dyn_len;
2856         state->smb2.max_dyn_len = max_dyn_len;
2857
2858         if (state->smb2.should_encrypt) {
2859                 SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2860                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid);
2861         }
2862
2863         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2864         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2865         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2866         SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence);
2867         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2868         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            0); /* reserved */
2869         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2870         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2871
2872         switch (cmd) {
2873         case SMB2_OP_CANCEL:
2874                 state->one_way = true;
2875                 break;
2876         case SMB2_OP_BREAK:
2877                 /*
2878                  * If this is a dummy request, it will have
2879                  * UINT64_MAX as message id.
2880                  * If we send on break acknowledgement,
2881                  * this gets overwritten later.
2882                  */
2883                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2884                 break;
2885         }
2886
2887         if (timeout_msec > 0) {
2888                 struct timeval endtime;
2889
2890                 endtime = timeval_current_ofs_msec(timeout_msec);
2891                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2892                         return req;
2893                 }
2894         }
2895
2896         return req;
2897 }
2898
2899 void smb2cli_req_set_notify_async(struct tevent_req *req)
2900 {
2901         struct smbXcli_req_state *state =
2902                 tevent_req_data(req,
2903                 struct smbXcli_req_state);
2904
2905         state->smb2.notify_async = true;
2906 }
2907
2908 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2909 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2910                                                TALLOC_CTX *tmp_mem,
2911                                                uint8_t *inbuf);
2912
2913 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2914                                      int num_reqs)
2915 {
2916         struct smbXcli_req_state *state;
2917         struct tevent_req *subreq;
2918         struct iovec *iov;
2919         int i, num_iov, nbt_len;
2920         int tf_iov = -1;
2921         const DATA_BLOB *encryption_key = NULL;
2922         uint64_t encryption_session_id = 0;
2923         uint64_t nonce_high = UINT64_MAX;
2924         uint64_t nonce_low = UINT64_MAX;
2925
2926         /*
2927          * 1 for the nbt length, optional TRANSFORM
2928          * per request: HDR, fixed, dyn, padding
2929          * -1 because the last one does not need padding
2930          */
2931
2932         iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1);
2933         if (iov == NULL) {
2934                 return NT_STATUS_NO_MEMORY;
2935         }
2936
2937         num_iov = 1;
2938         nbt_len = 0;
2939
2940         /*
2941          * the session of the first request that requires encryption
2942          * specifies the encryption key.
2943          */
2944         for (i=0; i<num_reqs; i++) {
2945                 if (!tevent_req_is_in_progress(reqs[i])) {
2946                         return NT_STATUS_INTERNAL_ERROR;
2947                 }
2948
2949                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2950
2951                 if (!smbXcli_conn_is_connected(state->conn)) {
2952                         return NT_STATUS_CONNECTION_DISCONNECTED;
2953                 }
2954
2955                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2956                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2957                         return NT_STATUS_REVISION_MISMATCH;
2958                 }
2959
2960                 if (state->session == NULL) {
2961                         continue;
2962                 }
2963
2964                 if (!state->smb2.should_encrypt) {
2965                         continue;
2966                 }
2967
2968                 encryption_key = &state->session->smb2->encryption_key;
2969                 if (encryption_key->length == 0) {
2970                         return NT_STATUS_INVALID_PARAMETER_MIX;
2971                 }
2972
2973                 encryption_session_id = state->session->smb2->session_id;
2974
2975                 state->session->smb2->nonce_low += 1;
2976                 if (state->session->smb2->nonce_low == 0) {
2977                         state->session->smb2->nonce_high += 1;
2978                         state->session->smb2->nonce_low += 1;
2979                 }
2980
2981                 /*
2982                  * CCM and GCM algorithms must never have their
2983                  * nonce wrap, or the security of the whole
2984                  * communication and the keys is destroyed.
2985                  * We must drop the connection once we have
2986                  * transfered too much data.
2987                  *
2988                  * NOTE: We assume nonces greater than 8 bytes.
2989                  */
2990                 if (state->session->smb2->nonce_high >=
2991                     state->session->smb2->nonce_high_max)
2992                 {
2993                         return NT_STATUS_ENCRYPTION_FAILED;
2994                 }
2995
2996                 nonce_high = state->session->smb2->nonce_high_random;
2997                 nonce_high += state->session->smb2->nonce_high;
2998                 nonce_low = state->session->smb2->nonce_low;
2999
3000                 tf_iov = num_iov;
3001                 iov[num_iov].iov_base = state->smb2.transform;
3002                 iov[num_iov].iov_len  = sizeof(state->smb2.transform);
3003                 num_iov += 1;
3004
3005                 SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
3006                 SBVAL(state->smb2.transform, SMB2_TF_NONCE,
3007                       nonce_low);
3008                 SBVAL(state->smb2.transform, SMB2_TF_NONCE+8,
3009                       nonce_high);
3010                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID,
3011                       encryption_session_id);
3012
3013                 nbt_len += SMB2_TF_HDR_SIZE;
3014                 break;
3015         }
3016
3017         for (i=0; i<num_reqs; i++) {
3018                 int hdr_iov;
3019                 size_t reqlen;
3020                 bool ret;
3021                 uint16_t opcode;
3022                 uint64_t avail;
3023                 uint16_t charge;
3024                 uint16_t credits;
3025                 uint64_t mid;
3026                 const DATA_BLOB *signing_key = NULL;
3027
3028                 if (!tevent_req_is_in_progress(reqs[i])) {
3029                         return NT_STATUS_INTERNAL_ERROR;
3030                 }
3031
3032                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
3033
3034                 if (!smbXcli_conn_is_connected(state->conn)) {
3035                         return NT_STATUS_CONNECTION_DISCONNECTED;
3036                 }
3037
3038                 if ((state->conn->protocol != PROTOCOL_NONE) &&
3039                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
3040                         return NT_STATUS_REVISION_MISMATCH;
3041                 }
3042
3043                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3044                 if (opcode == SMB2_OP_CANCEL) {
3045                         goto skip_credits;
3046                 }
3047
3048                 avail = UINT64_MAX - state->conn->smb2.mid;
3049                 if (avail < 1) {
3050                         return NT_STATUS_CONNECTION_ABORTED;
3051                 }
3052
3053                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
3054                         uint32_t max_dyn_len = 1;
3055
3056                         max_dyn_len = MAX(max_dyn_len, state->smb2.dyn_len);
3057                         max_dyn_len = MAX(max_dyn_len, state->smb2.max_dyn_len);
3058
3059                         charge = (max_dyn_len - 1)/ 65536 + 1;
3060                 } else {
3061                         charge = 1;
3062                 }
3063
3064                 charge = MAX(state->smb2.credit_charge, charge);
3065
3066                 avail = MIN(avail, state->conn->smb2.cur_credits);
3067                 if (avail < charge) {
3068                         return NT_STATUS_INTERNAL_ERROR;
3069                 }
3070
3071                 credits = 0;
3072                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
3073                         credits = state->conn->smb2.max_credits -
3074                                   state->conn->smb2.cur_credits;
3075                 }
3076                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
3077                         credits += 1;
3078                 }
3079
3080                 mid = state->conn->smb2.mid;
3081                 state->conn->smb2.mid += charge;
3082                 state->conn->smb2.cur_credits -= charge;
3083
3084                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
3085                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
3086                 }
3087                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
3088                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
3089
3090                 state->smb2.cancel_flags = 0;
3091                 state->smb2.cancel_mid = mid;
3092                 state->smb2.cancel_aid = 0;
3093
3094 skip_credits:
3095                 if (state->session && encryption_key == NULL) {
3096                         /*
3097                          * We prefer the channel signing key if it is
3098                          * already there.
3099                          */
3100                         if (state->smb2.should_sign) {
3101                                 signing_key = &state->session->smb2_channel.signing_key;
3102                         }
3103
3104                         /*
3105                          * If it is a channel binding, we already have the main
3106                          * signing key and try that one.
3107                          */
3108                         if (signing_key && signing_key->length == 0) {
3109                                 signing_key = &state->session->smb2->signing_key;
3110                         }
3111
3112                         /*
3113                          * If we do not have any session key yet, we skip the
3114                          * signing of SMB2_OP_SESSSETUP requests.
3115                          */
3116                         if (signing_key && signing_key->length == 0) {
3117                                 signing_key = NULL;
3118                         }
3119                 }
3120
3121                 hdr_iov = num_iov;
3122                 iov[num_iov].iov_base = state->smb2.hdr;
3123                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
3124                 num_iov += 1;
3125
3126                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
3127                 iov[num_iov].iov_len  = state->smb2.fixed_len;
3128                 num_iov += 1;
3129
3130                 if (state->smb2.dyn != NULL) {
3131                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
3132                         iov[num_iov].iov_len  = state->smb2.dyn_len;
3133                         num_iov += 1;
3134                 }
3135
3136                 reqlen  = sizeof(state->smb2.hdr);
3137                 reqlen += state->smb2.fixed_len;
3138                 reqlen += state->smb2.dyn_len;
3139
3140                 if (i < num_reqs-1) {
3141                         if ((reqlen % 8) > 0) {
3142                                 uint8_t pad = 8 - (reqlen % 8);
3143                                 iov[num_iov].iov_base = state->smb2.pad;
3144                                 iov[num_iov].iov_len = pad;
3145                                 num_iov += 1;
3146                                 reqlen += pad;
3147                         }
3148                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
3149                 }
3150
3151                 state->smb2.encryption_session_id = encryption_session_id;
3152
3153                 if (signing_key != NULL) {
3154                         NTSTATUS status;
3155
3156                         status = smb2_signing_sign_pdu(*signing_key,
3157                                                        state->session->conn->protocol,
3158                                                        &iov[hdr_iov], num_iov - hdr_iov);
3159                         if (!NT_STATUS_IS_OK(status)) {
3160                                 return status;
3161                         }
3162                 }
3163
3164                 nbt_len += reqlen;
3165
3166                 ret = smbXcli_req_set_pending(reqs[i]);
3167                 if (!ret) {
3168                         return NT_STATUS_NO_MEMORY;
3169                 }
3170         }
3171
3172         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
3173         _smb_setlen_tcp(state->length_hdr, nbt_len);
3174         iov[0].iov_base = state->length_hdr;
3175         iov[0].iov_len  = sizeof(state->length_hdr);
3176
3177         if (encryption_key != NULL) {
3178                 NTSTATUS status;
3179                 size_t buflen = nbt_len - SMB2_TF_HDR_SIZE;
3180                 uint8_t *buf;
3181                 int vi;
3182
3183                 buf = talloc_array(iov, uint8_t, buflen);
3184                 if (buf == NULL) {
3185                         return NT_STATUS_NO_MEMORY;
3186                 }
3187
3188                 /*
3189                  * We copy the buffers before encrypting them,
3190                  * this is at least currently needed for the
3191                  * to keep state->smb2.hdr.
3192                  *
3193                  * Also the callers may expect there buffers
3194                  * to be const.
3195                  */
3196                 for (vi = tf_iov + 1; vi < num_iov; vi++) {
3197                         struct iovec *v = &iov[vi];
3198                         const uint8_t *o = (const uint8_t *)v->iov_base;
3199
3200                         memcpy(buf, o, v->iov_len);
3201                         v->iov_base = (void *)buf;
3202                         buf += v->iov_len;
3203                 }
3204
3205                 status = smb2_signing_encrypt_pdu(*encryption_key,
3206                                         state->conn->smb2.server.cipher,
3207                                         &iov[tf_iov], num_iov - tf_iov);
3208                 if (!NT_STATUS_IS_OK(status)) {
3209                         return status;
3210                 }
3211         }
3212
3213         if (state->conn->dispatch_incoming == NULL) {
3214                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3215         }
3216
3217         subreq = writev_send(state, state->ev, state->conn->outgoing,
3218                              state->conn->sock_fd, false, iov, num_iov);
3219         if (subreq == NULL) {
3220                 return NT_STATUS_NO_MEMORY;
3221         }
3222         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
3223         state->write_req = subreq;
3224
3225         return NT_STATUS_OK;
3226 }
3227
3228 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
3229 {
3230         struct smbXcli_req_state *state =
3231                 tevent_req_data(req,
3232                 struct smbXcli_req_state);
3233
3234         state->smb2.credit_charge = charge;
3235 }
3236
3237 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
3238                                     struct tevent_context *ev,
3239                                     struct smbXcli_conn *conn,
3240                                     uint16_t cmd,
3241                                     uint32_t additional_flags,
3242                                     uint32_t clear_flags,
3243                                     uint32_t timeout_msec,
3244                                     struct smbXcli_tcon *tcon,
3245                                     struct smbXcli_session *session,
3246                                     const uint8_t *fixed,
3247                                     uint16_t fixed_len,
3248                                     const uint8_t *dyn,
3249                                     uint32_t dyn_len,
3250                                     uint32_t max_dyn_len)
3251 {
3252         struct tevent_req *req;
3253         NTSTATUS status;
3254
3255         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
3256                                  additional_flags, clear_flags,
3257                                  timeout_msec,
3258                                  tcon, session,
3259                                  fixed, fixed_len,
3260                                  dyn, dyn_len,
3261                                  max_dyn_len);
3262         if (req == NULL) {
3263                 return NULL;
3264         }
3265         if (!tevent_req_is_in_progress(req)) {
3266                 return tevent_req_post(req, ev);
3267         }
3268         status = smb2cli_req_compound_submit(&req, 1);
3269         if (tevent_req_nterror(req, status)) {
3270                 return tevent_req_post(req, ev);
3271         }
3272         return req;
3273 }
3274
3275 static void smb2cli_req_writev_done(struct tevent_req *subreq)
3276 {
3277         struct tevent_req *req =
3278                 tevent_req_callback_data(subreq,
3279                 struct tevent_req);
3280         struct smbXcli_req_state *state =
3281                 tevent_req_data(req,
3282                 struct smbXcli_req_state);
3283         ssize_t nwritten;
3284         int err;
3285
3286         state->write_req = NULL;
3287
3288         nwritten = writev_recv(subreq, &err);
3289         TALLOC_FREE(subreq);
3290         if (nwritten == -1) {
3291                 /* here, we need to notify all pending requests */
3292                 NTSTATUS status = map_nt_error_from_unix_common(err);
3293                 smbXcli_conn_disconnect(state->conn, status);
3294                 return;
3295         }
3296 }
3297
3298 static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn,
3299                                              uint8_t *buf,
3300                                              size_t buflen,
3301                                              TALLOC_CTX *mem_ctx,
3302                                              struct iovec **piov, int *pnum_iov)
3303 {
3304         struct iovec *iov;
3305         int num_iov = 0;
3306         size_t taken = 0;
3307         uint8_t *first_hdr = buf;
3308         size_t verified_buflen = 0;
3309         uint8_t *tf = NULL;
3310         size_t tf_len = 0;
3311
3312         iov = talloc_array(mem_ctx, struct iovec, num_iov);
3313         if (iov == NULL) {
3314                 return NT_STATUS_NO_MEMORY;
3315         }
3316
3317         while (taken < buflen) {
3318                 size_t len = buflen - taken;
3319                 uint8_t *hdr = first_hdr + taken;
3320                 struct iovec *cur;
3321                 size_t full_size;
3322                 size_t next_command_ofs;
3323                 uint16_t body_size;
3324                 struct iovec *iov_tmp;
3325
3326                 if (verified_buflen > taken) {
3327                         len = verified_buflen - taken;
3328                 } else {
3329                         tf = NULL;
3330                         tf_len = 0;
3331                 }
3332
3333                 if (len < 4) {
3334                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3335                                    (int)len, 4));
3336                         goto inval;
3337                 }
3338                 if (IVAL(hdr, 0) == SMB2_TF_MAGIC) {
3339                         struct smbXcli_session *s;
3340                         uint64_t uid;
3341                         struct iovec tf_iov[2];
3342                         size_t enc_len;
3343                         NTSTATUS status;
3344
3345                         if (len < SMB2_TF_HDR_SIZE) {
3346                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3347                                            (int)len, SMB2_TF_HDR_SIZE));
3348                                 goto inval;
3349                         }
3350                         tf = hdr;
3351                         tf_len = SMB2_TF_HDR_SIZE;
3352                         taken += tf_len;
3353
3354                         hdr = first_hdr + taken;
3355                         enc_len = IVAL(tf, SMB2_TF_MSG_SIZE);
3356                         uid = BVAL(tf, SMB2_TF_SESSION_ID);
3357
3358                         if (len < SMB2_TF_HDR_SIZE + enc_len) {
3359                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3360                                            (int)len,
3361                                            (int)(SMB2_TF_HDR_SIZE + enc_len)));
3362                                 goto inval;
3363                         }
3364
3365                         s = conn->sessions;
3366                         for (; s; s = s->next) {
3367                                 if (s->smb2->session_id != uid) {
3368                                         continue;
3369                                 }
3370                                 break;
3371                         }
3372
3373                         if (s == NULL) {
3374                                 DEBUG(10, ("unknown session_id %llu\n",
3375                                            (unsigned long long)uid));
3376                                 goto inval;
3377                         }
3378
3379                         tf_iov[0].iov_base = (void *)tf;
3380                         tf_iov[0].iov_len = tf_len;
3381                         tf_iov[1].iov_base = (void *)hdr;
3382                         tf_iov[1].iov_len = enc_len;
3383
3384                         status = smb2_signing_decrypt_pdu(s->smb2->decryption_key,
3385                                                           conn->smb2.server.cipher,
3386                                                           tf_iov, 2);
3387                         if (!NT_STATUS_IS_OK(status)) {
3388                                 TALLOC_FREE(iov);
3389                                 return status;
3390                         }
3391
3392                         verified_buflen = taken + enc_len;
3393                         len = enc_len;
3394                 }
3395
3396                 /*
3397                  * We need the header plus the body length field
3398                  */
3399
3400                 if (len < SMB2_HDR_BODY + 2) {
3401                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3402                                    (int)len, SMB2_HDR_BODY));
3403                         goto inval;
3404                 }
3405                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
3406                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
3407                                    IVAL(hdr, 0)));
3408                         goto inval;
3409                 }
3410                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
3411                         DEBUG(10, ("Got HDR len %d, expected %d\n",
3412                                    SVAL(hdr, 4), SMB2_HDR_BODY));
3413                         goto inval;
3414                 }
3415
3416                 full_size = len;
3417                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
3418                 body_size = SVAL(hdr, SMB2_HDR_BODY);
3419
3420                 if (next_command_ofs != 0) {
3421                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
3422                                 goto inval;
3423                         }
3424                         if (next_command_ofs > full_size) {
3425                                 goto inval;
3426                         }
3427                         full_size = next_command_ofs;
3428                 }
3429                 if (body_size < 2) {
3430                         goto inval;
3431                 }
3432                 body_size &= 0xfffe;
3433
3434                 if (body_size > (full_size - SMB2_HDR_BODY)) {
3435                         goto inval;
3436                 }
3437
3438                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
3439                                          num_iov + 4);
3440                 if (iov_tmp == NULL) {
3441                         TALLOC_FREE(iov);
3442                         return NT_STATUS_NO_MEMORY;
3443                 }
3444                 iov = iov_tmp;
3445                 cur = &iov[num_iov];
3446                 num_iov += 4;
3447
3448                 cur[0].iov_base = tf;
3449                 cur[0].iov_len  = tf_len;
3450                 cur[1].iov_base = hdr;
3451                 cur[1].iov_len  = SMB2_HDR_BODY;
3452                 cur[2].iov_base = hdr + SMB2_HDR_BODY;
3453                 cur[2].iov_len  = body_size;
3454                 cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size;
3455                 cur[3].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
3456
3457                 taken += full_size;
3458         }
3459
3460         *piov = iov;
3461         *pnum_iov = num_iov;
3462         return NT_STATUS_OK;
3463
3464 inval:
3465         TALLOC_FREE(iov);
3466         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3467 }
3468
3469 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
3470                                                     uint64_t mid)
3471 {
3472         size_t num_pending = talloc_array_length(conn->pending);
3473         size_t i;
3474
3475         for (i=0; i<num_pending; i++) {
3476                 struct tevent_req *req = conn->pending[i];
3477                 struct smbXcli_req_state *state =
3478                         tevent_req_data(req,
3479                         struct smbXcli_req_state);
3480
3481                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
3482                         return req;
3483                 }
3484         }
3485         return NULL;
3486 }
3487
3488 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3489                                                TALLOC_CTX *tmp_mem,
3490                                                uint8_t *inbuf)
3491 {
3492         struct tevent_req *req;
3493         struct smbXcli_req_state *state = NULL;
3494         struct iovec *iov;
3495         int i, num_iov;
3496         NTSTATUS status;
3497         bool defer = true;
3498         struct smbXcli_session *last_session = NULL;
3499         size_t inbuf_len = smb_len_tcp(inbuf);
3500
3501         status = smb2cli_inbuf_parse_compound(conn,
3502                                               inbuf + NBT_HDR_SIZE,
3503                                               inbuf_len,
3504                                               tmp_mem,
3505                                               &iov, &num_iov);
3506         if (!NT_STATUS_IS_OK(status)) {
3507                 return status;
3508         }
3509
3510         for (i=0; i<num_iov; i+=4) {
3511                 uint8_t *inbuf_ref = NULL;
3512                 struct iovec *cur = &iov[i];
3513                 uint8_t *inhdr = (uint8_t *)cur[1].iov_base;
3514                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
3515                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
3516                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
3517                 uint16_t req_opcode;
3518                 uint32_t req_flags;
3519                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
3520                 uint32_t new_credits;
3521                 struct smbXcli_session *session = NULL;
3522                 const DATA_BLOB *signing_key = NULL;
3523                 bool was_encrypted = false;
3524
3525                 new_credits = conn->smb2.cur_credits;
3526                 new_credits += credits;
3527                 if (new_credits > UINT16_MAX) {
3528                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3529                 }
3530                 conn->smb2.cur_credits += credits;
3531
3532                 req = smb2cli_conn_find_pending(conn, mid);
3533                 if (req == NULL) {
3534                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3535                 }
3536                 state = tevent_req_data(req, struct smbXcli_req_state);
3537
3538                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3539                 if (opcode != req_opcode) {
3540                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3541                 }
3542                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
3543
3544                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
3545                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3546                 }
3547
3548                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
3549                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
3550                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
3551                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
3552
3553                         if (state->smb2.got_async) {
3554                                 /* We only expect one STATUS_PENDING response */
3555                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3556                         }
3557                         state->smb2.got_async = true;
3558
3559                         /*
3560                          * async interim responses are not signed,
3561                          * even if the SMB2_HDR_FLAG_SIGNED flag
3562                          * is set.
3563                          */
3564                         state->smb2.cancel_flags = SMB2_HDR_FLAG_ASYNC;
3565                         state->smb2.cancel_mid = 0;
3566                         state->smb2.cancel_aid = async_id;
3567
3568                         if (state->smb2.notify_async) {
3569                                 tevent_req_defer_callback(req, state->ev);
3570                                 tevent_req_notify_callback(req);
3571                         }
3572                         continue;
3573                 }
3574
3575                 session = state->session;
3576                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
3577                         session = last_session;
3578                 }
3579                 last_session = session;
3580
3581                 if (state->smb2.should_sign) {
3582                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
3583                                 return NT_STATUS_ACCESS_DENIED;
3584                         }
3585                 }
3586
3587                 if (flags & SMB2_HDR_FLAG_SIGNED) {
3588                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
3589
3590                         if (session == NULL) {
3591                                 struct smbXcli_session *s;
3592
3593                                 s = state->conn->sessions;
3594                                 for (; s; s = s->next) {
3595                                         if (s->smb2->session_id != uid) {
3596                                                 continue;
3597                                         }
3598
3599                                         session = s;
3600                                         break;
3601                                 }
3602                         }
3603
3604                         if (session == NULL) {
3605                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3606                         }
3607
3608                         last_session = session;
3609                         signing_key = &session->smb2_channel.signing_key;
3610                 }
3611
3612                 if (opcode == SMB2_OP_SESSSETUP) {
3613                         /*
3614                          * We prefer the channel signing key, if it is
3615                          * already there.
3616                          *
3617                          * If we do not have a channel signing key yet,
3618                          * we try the main signing key, if it is not
3619                          * the final response.
3620                          */
3621                         if (signing_key && signing_key->length == 0 &&
3622                             !NT_STATUS_IS_OK(status)) {
3623                                 signing_key = &session->smb2->signing_key;
3624                         }
3625
3626                         if (signing_key && signing_key->length == 0) {
3627                                 /*
3628                                  * If we do not have a session key to
3629                                  * verify the signature, we defer the
3630                                  * signing check to the caller.
3631                                  *
3632                                  * The caller gets NT_STATUS_OK, it
3633                                  * has to call
3634                                  * smb2cli_session_set_session_key()
3635                                  * or
3636                                  * smb2cli_session_set_channel_key()
3637                                  * which will check the signature
3638                                  * with the channel signing key.
3639                                  */
3640                                 signing_key = NULL;
3641                         }
3642                 }
3643
3644                 if (cur[0].iov_len == SMB2_TF_HDR_SIZE) {
3645                         const uint8_t *tf = (const uint8_t *)cur[0].iov_base;
3646                         uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID);
3647
3648                         /*
3649                          * If the response was encrypted in a SMB2_TRANSFORM
3650                          * pdu, which belongs to the correct session,
3651                          * we do not need to do signing checks
3652                          *
3653                          * It could be the session the response belongs to
3654                          * or the session that was used to encrypt the
3655                          * SMB2_TRANSFORM request.
3656                          */
3657                         if ((session && session->smb2->session_id == uid) ||
3658                             (state->smb2.encryption_session_id == uid)) {
3659                                 signing_key = NULL;
3660                                 was_encrypted = true;
3661                         }
3662                 }
3663
3664                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
3665                         /*
3666                          * if the server returns NT_STATUS_USER_SESSION_DELETED
3667                          * the response is not signed and we should
3668                          * propagate the NT_STATUS_USER_SESSION_DELETED
3669                          * status to the caller.
3670                          */
3671                         state->smb2.signing_skipped = true;
3672                         signing_key = NULL;
3673                 }
3674
3675                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3676                         /*
3677                          * if the server returns
3678                          * NT_STATUS_INVALID_PARAMETER
3679                          * the response might not be encrypted.
3680                          */
3681                         if (state->smb2.should_encrypt && !was_encrypted) {
3682                                 state->smb2.signing_skipped = true;
3683                                 signing_key = NULL;
3684                         }
3685                 }
3686
3687                 if (state->smb2.should_encrypt && !was_encrypted) {
3688                         if (!state->smb2.signing_skipped) {
3689                                 return NT_STATUS_ACCESS_DENIED;
3690                         }
3691                 }
3692
3693                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
3694                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
3695                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3696                         /*
3697                          * if the server returns
3698                          * NT_STATUS_NETWORK_NAME_DELETED
3699                          * NT_STATUS_FILE_CLOSED
3700                          * NT_STATUS_INVALID_PARAMETER
3701                          * the response might not be signed
3702                          * as this happens before the signing checks.
3703                          *
3704                          * If server echos the signature (or all zeros)
3705                          * we should report the status from the server
3706                          * to the caller.
3707                          */
3708                         if (signing_key) {
3709                                 int cmp;
3710
3711                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3712                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
3713                                              16);
3714                                 if (cmp == 0) {
3715                                         state->smb2.signing_skipped = true;
3716                                         signing_key = NULL;
3717                                 }
3718                         }
3719                         if (signing_key) {
3720                                 int cmp;
3721                                 static const uint8_t zeros[16];
3722
3723                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3724                                              zeros,
3725                                              16);
3726                                 if (cmp == 0) {
3727                                         state->smb2.signing_skipped = true;
3728                                         signing_key = NULL;
3729                                 }
3730                         }
3731                 }
3732
3733                 if (signing_key) {
3734                         status = smb2_signing_check_pdu(*signing_key,
3735                                                         state->conn->protocol,
3736                                                         &cur[1], 3);
3737                         if (!NT_STATUS_IS_OK(status)) {
3738                                 /*
3739                                  * If the signing check fails, we disconnect
3740                                  * the connection.
3741                                  */
3742                                 return status;
3743                         }
3744                 }
3745
3746                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
3747                     (session != NULL) && session->disconnect_expired)
3748                 {
3749                         /*
3750                          * this should be a short term hack
3751                          * until the upper layers have implemented
3752                          * re-authentication.
3753                          */
3754                         return status;
3755                 }
3756
3757                 smbXcli_req_unset_pending(req);
3758
3759                 /*
3760                  * There might be more than one response
3761                  * we need to defer the notifications
3762                  */
3763                 if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) {
3764                         defer = false;
3765                 }
3766
3767                 if (defer) {
3768                         tevent_req_defer_callback(req, state->ev);
3769                 }
3770
3771                 /*
3772                  * Note: here we use talloc_reference() in a way
3773                  *       that does not expose it to the caller.
3774                  */
3775                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3776                 if (tevent_req_nomem(inbuf_ref, req)) {
3777                         continue;
3778                 }
3779
3780                 /* copy the related buffers */
3781                 state->smb2.recv_iov[0] = cur[1];
3782                 state->smb2.recv_iov[1] = cur[2];
3783                 state->smb2.recv_iov[2] = cur[3];
3784
3785                 tevent_req_done(req);
3786         }
3787
3788         if (defer) {
3789                 return NT_STATUS_RETRY;
3790         }
3791
3792         return NT_STATUS_OK;
3793 }
3794
3795 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3796                           struct iovec **piov,
3797                           const struct smb2cli_req_expected_response *expected,
3798                           size_t num_expected)
3799 {
3800         struct smbXcli_req_state *state =
3801                 tevent_req_data(req,
3802                 struct smbXcli_req_state);
3803         NTSTATUS status;
3804         size_t body_size;
3805         bool found_status = false;
3806         bool found_size = false;
3807         size_t i;
3808
3809         if (piov != NULL) {
3810                 *piov = NULL;
3811         }
3812
3813         if (tevent_req_is_in_progress(req) && state->smb2.got_async) {
3814                 return STATUS_PENDING;
3815         }
3816
3817         if (tevent_req_is_nterror(req, &status)) {
3818                 for (i=0; i < num_expected; i++) {
3819                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
3820                                 found_status = true;
3821                                 break;
3822                         }
3823                 }
3824
3825                 if (found_status) {
3826                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3827                 }
3828
3829                 return status;
3830         }
3831
3832         if (num_expected == 0) {
3833                 found_status = true;
3834                 found_size = true;
3835         }
3836
3837         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3838         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3839
3840         for (i=0; i < num_expected; i++) {
3841                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3842                         continue;
3843                 }
3844
3845                 found_status = true;
3846                 if (expected[i].body_size == 0) {
3847                         found_size = true;
3848                         break;
3849                 }
3850
3851                 if (expected[i].body_size == body_size) {
3852                         found_size = true;
3853                         break;
3854                 }
3855         }
3856
3857         if (!found_status) {
3858                 return status;
3859         }
3860
3861         if (state->smb2.signing_skipped) {
3862                 if (num_expected > 0) {
3863                         return NT_STATUS_ACCESS_DENIED;
3864                 }
3865                 if (!NT_STATUS_IS_ERR(status)) {
3866                         return NT_STATUS_ACCESS_DENIED;
3867                 }
3868         }
3869
3870         if (!found_size) {
3871                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3872         }
3873
3874         if (piov != NULL) {
3875                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3876         }
3877
3878         return status;
3879 }
3880
3881 NTSTATUS smb2cli_req_get_sent_iov(struct tevent_req *req,
3882                                   struct iovec *sent_iov)
3883 {
3884         struct smbXcli_req_state *state =
3885                 tevent_req_data(req,
3886                 struct smbXcli_req_state);
3887
3888         if (tevent_req_is_in_progress(req)) {
3889                 return STATUS_PENDING;
3890         }
3891
3892         sent_iov[0].iov_base = state->smb2.hdr;
3893         sent_iov[0].iov_len  = sizeof(state->smb2.hdr);
3894
3895         sent_iov[1].iov_base = discard_const(state->smb2.fixed);
3896         sent_iov[1].iov_len  = state->smb2.fixed_len;
3897
3898         if (state->smb2.dyn != NULL) {
3899                 sent_iov[2].iov_base = discard_const(state->smb2.dyn);
3900                 sent_iov[2].iov_len  = state->smb2.dyn_len;
3901         } else {
3902                 sent_iov[2].iov_base = NULL;
3903                 sent_iov[2].iov_len  = 0;
3904         }
3905
3906         return NT_STATUS_OK;
3907 }
3908
3909 static const struct {
3910         enum protocol_types proto;
3911         const char *smb1_name;
3912 } smb1cli_prots[] = {
3913         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3914         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3915         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3916         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3917         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3918         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3919         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3920         {PROTOCOL_LANMAN2,      "Samba"},
3921         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3922         {PROTOCOL_NT1,          "NT LM 0.12"},
3923         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3924         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3925 };
3926
3927 static const struct {
3928         enum protocol_types proto;
3929         uint16_t smb2_dialect;
3930 } smb2cli_prots[] = {
3931         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3932         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3933         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3934         {PROTOCOL_SMB2_24,      SMB2_DIALECT_REVISION_224},
3935         {PROTOCOL_SMB3_00,      SMB3_DIALECT_REVISION_300},
3936         {PROTOCOL_SMB3_02,      SMB3_DIALECT_REVISION_302},
3937         {PROTOCOL_SMB3_10,      SMB3_DIALECT_REVISION_310},
3938         {PROTOCOL_SMB3_11,      SMB3_DIALECT_REVISION_311},
3939 };
3940
3941 struct smbXcli_negprot_state {
3942         struct smbXcli_conn *conn;
3943         struct tevent_context *ev;
3944         uint32_t timeout_msec;
3945
3946         struct {
3947                 uint8_t fixed[36];
3948         } smb2;
3949 };
3950
3951 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3952 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3953 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3954 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3955 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3956 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3957                                                   TALLOC_CTX *frame,
3958                                                   uint8_t *inbuf);
3959
3960 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3961                                         struct tevent_context *ev,
3962                                         struct smbXcli_conn *conn,
3963                                         uint32_t timeout_msec,
3964                                         enum protocol_types min_protocol,
3965                                         enum protocol_types max_protocol)
3966 {
3967         struct tevent_req *req, *subreq;
3968         struct smbXcli_negprot_state *state;
3969
3970         req = tevent_req_create(mem_ctx, &state,
3971                                 struct smbXcli_negprot_state);
3972         if (req == NULL) {
3973                 return NULL;
3974         }
3975         state->conn = conn;
3976         state->ev = ev;
3977         state->timeout_msec = timeout_msec;
3978
3979         if (min_protocol == PROTOCOL_NONE) {
3980                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3981                 return tevent_req_post(req, ev);
3982         }
3983
3984         if (max_protocol == PROTOCOL_NONE) {
3985                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3986                 return tevent_req_post(req, ev);
3987         }
3988
3989         if (min_protocol > max_protocol) {
3990                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3991                 return tevent_req_post(req, ev);
3992         }
3993
3994         conn->min_protocol = min_protocol;
3995         conn->max_protocol = max_protocol;
3996         conn->protocol = PROTOCOL_NONE;
3997
3998         if ((min_protocol < PROTOCOL_SMB2_02) &&
3999             (max_protocol < PROTOCOL_SMB2_02)) {
4000                 /*
4001                  * SMB1 only...
4002                  */
4003                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4004
4005                 subreq = smbXcli_negprot_smb1_subreq(state);
4006                 if (tevent_req_nomem(subreq, req)) {
4007                         return tevent_req_post(req, ev);
4008                 }
4009                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4010                 return req;
4011         }
4012
4013         if ((min_protocol >= PROTOCOL_SMB2_02) &&
4014             (max_protocol >= PROTOCOL_SMB2_02)) {
4015                 /*
4016                  * SMB2 only...
4017                  */
4018                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4019
4020                 /*
4021                  * As we're starting with an SMB2 negprot, emulate Windows
4022                  * and ask for 31 credits in the initial SMB2 negprot.
4023                  * If we don't and leave requested credits at
4024                  * zero, MacOSX servers return zero credits on
4025                  * the negprot reply and we fail to connect.
4026                  */
4027                 smb2cli_conn_set_max_credits(conn,
4028                         WINDOWS_CLIENT_PURE_SMB2_NEGPROT_INITIAL_CREDIT_ASK);
4029
4030                 subreq = smbXcli_negprot_smb2_subreq(state);
4031                 if (tevent_req_nomem(subreq, req)) {
4032                         return tevent_req_post(req, ev);
4033                 }
4034                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4035                 return req;
4036         }
4037
4038         /*
4039          * We send an SMB1 negprot with the SMB2 dialects
4040          * and expect a SMB1 or a SMB2 response.
4041          *
4042          * smbXcli_negprot_dispatch_incoming() will fix the
4043          * callback to match protocol of the response.
4044          */
4045         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
4046
4047         subreq = smbXcli_negprot_smb1_subreq(state);
4048         if (tevent_req_nomem(subreq, req)) {
4049                 return tevent_req_post(req, ev);
4050         }
4051         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
4052         return req;
4053 }
4054
4055 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
4056 {
4057         struct tevent_req *req =
4058                 tevent_req_callback_data(subreq,
4059                 struct tevent_req);
4060         NTSTATUS status;
4061
4062         /*
4063          * we just want the low level error
4064          */
4065         status = tevent_req_simple_recv_ntstatus(subreq);
4066         TALLOC_FREE(subreq);
4067         if (tevent_req_nterror(req, status)) {
4068                 return;
4069         }
4070
4071         /* this should never happen */
4072         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
4073 }
4074
4075 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
4076 {
4077         size_t i;
4078         DATA_BLOB bytes = data_blob_null;
4079         uint8_t flags;
4080         uint16_t flags2;
4081
4082         /* setup the protocol strings */
4083         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
4084                 uint8_t c = 2;
4085                 bool ok;
4086
4087                 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
4088                         continue;
4089                 }
4090
4091                 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
4092                         continue;
4093                 }
4094
4095                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
4096                 if (!ok) {
4097                         return NULL;
4098                 }
4099
4100                 /*
4101                  * We now it is already ascii and
4102                  * we want NULL termination.
4103                  */
4104                 ok = data_blob_append(state, &bytes,
4105                                       smb1cli_prots[i].smb1_name,
4106                                       strlen(smb1cli_prots[i].smb1_name)+1);
4107                 if (!ok) {
4108                         return NULL;
4109                 }
4110         }
4111
4112         smb1cli_req_flags(state->conn->max_protocol,
4113                           state->conn->smb1.client.capabilities,
4114                           SMBnegprot,
4115                           0, 0, &flags,
4116                           0, 0, &flags2);
4117
4118         return smb1cli_req_send(state, state->ev, state->conn,
4119                                 SMBnegprot,
4120                                 flags, ~flags,
4121                                 flags2, ~flags2,
4122                                 state->timeout_msec,
4123                                 0xFFFE, 0, NULL, /* pid, tid, session */
4124                                 0, NULL, /* wct, vwv */
4125                                 bytes.length, bytes.data);
4126 }
4127
4128 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
4129 {
4130         struct tevent_req *req =
4131                 tevent_req_callback_data(subreq,
4132                 struct tevent_req);
4133         struct smbXcli_negprot_state *state =
4134                 tevent_req_data(req,
4135                 struct smbXcli_negprot_state);
4136         struct smbXcli_conn *conn = state->conn;
4137         struct iovec *recv_iov = NULL;
4138         uint8_t *inhdr;
4139         uint8_t wct;
4140         uint16_t *vwv;
4141         uint32_t num_bytes;
4142         uint8_t *bytes;
4143         NTSTATUS status;
4144         uint16_t protnum;
4145         size_t i;
4146         size_t num_prots = 0;
4147         uint8_t flags;
4148         uint32_t client_capabilities = conn->smb1.client.capabilities;
4149         uint32_t both_capabilities;
4150         uint32_t server_capabilities = 0;
4151         uint32_t capabilities;
4152         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
4153         uint32_t server_max_xmit = 0;
4154         uint32_t max_xmit;
4155         uint32_t server_max_mux = 0;
4156         uint16_t server_security_mode = 0;
4157         uint32_t server_session_key = 0;
4158         bool server_readbraw = false;
4159         bool server_writebraw = false;
4160         bool server_lockread = false;
4161         bool server_writeunlock = false;
4162         struct GUID server_guid = GUID_zero();
4163         DATA_BLOB server_gss_blob = data_blob_null;
4164         uint8_t server_challenge[8];
4165         char *server_workgroup = NULL;
4166         char *server_name = NULL;
4167         int server_time_zone = 0;
4168         NTTIME server_system_time = 0;
4169         static const struct smb1cli_req_expected_response expected[] = {
4170         {
4171                 .status = NT_STATUS_OK,
4172                 .wct = 0x11, /* NT1 */
4173         },
4174         {
4175                 .status = NT_STATUS_OK,
4176                 .wct = 0x0D, /* LM */
4177         },
4178         {
4179                 .status = NT_STATUS_OK,
4180                 .wct = 0x01, /* CORE */
4181         }
4182         };
4183
4184         ZERO_STRUCT(server_challenge);
4185
4186         status = smb1cli_req_recv(subreq, state,
4187                                   &recv_iov,
4188                                   &inhdr,
4189                                   &wct,
4190                                   &vwv,
4191                                   NULL, /* pvwv_offset */
4192                                   &num_bytes,
4193                                   &bytes,
4194                                   NULL, /* pbytes_offset */
4195                                   NULL, /* pinbuf */
4196                                   expected, ARRAY_SIZE(expected));
4197         TALLOC_FREE(subreq);
4198         if (tevent_req_nterror(req, status)) {
4199                 return;
4200         }
4201
4202         flags = CVAL(inhdr, HDR_FLG);
4203
4204         protnum = SVAL(vwv, 0);
4205
4206         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
4207                 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
4208                         continue;
4209                 }
4210
4211                 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
4212                         continue;
4213                 }
4214
4215                 if (protnum != num_prots) {
4216                         num_prots++;
4217                         continue;
4218                 }
4219
4220                 conn->protocol = smb1cli_prots[i].proto;
4221                 break;
4222         }
4223
4224         if (conn->protocol == PROTOCOL_NONE) {
4225                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4226                 return;
4227         }
4228
4229         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
4230                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
4231                          "and the selected protocol level doesn't support it.\n"));
4232                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4233                 return;
4234         }
4235
4236         if (flags & FLAG_SUPPORT_LOCKREAD) {
4237                 server_lockread = true;
4238                 server_writeunlock = true;
4239         }
4240
4241         if (conn->protocol >= PROTOCOL_NT1) {
4242                 const char *client_signing = NULL;
4243                 bool server_mandatory = false;
4244                 bool server_allowed = false;
4245                 const char *server_signing = NULL;
4246                 bool ok;
4247                 uint8_t key_len;
4248
4249                 if (wct != 0x11) {
4250                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4251                         return;
4252                 }
4253
4254                 /* NT protocol */
4255                 server_security_mode = CVAL(vwv + 1, 0);
4256                 server_max_mux = SVAL(vwv + 1, 1);
4257                 server_max_xmit = IVAL(vwv + 3, 1);
4258                 server_session_key = IVAL(vwv + 7, 1);
4259                 server_time_zone = SVALS(vwv + 15, 1);
4260                 server_time_zone *= 60;
4261                 /* this time arrives in real GMT */
4262                 server_system_time = BVAL(vwv + 11, 1);
4263                 server_capabilities = IVAL(vwv + 9, 1);
4264
4265                 key_len = CVAL(vwv + 16, 1);
4266
4267                 if (server_capabilities & CAP_RAW_MODE) {
4268                         server_readbraw = true;
4269                         server_writebraw = true;
4270                 }
4271                 if (server_capabilities & CAP_LOCK_AND_READ) {
4272                         server_lockread = true;
4273                 }
4274
4275                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
4276                         DATA_BLOB blob1, blob2;
4277
4278                         if (num_bytes < 16) {
4279                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4280                                 return;
4281                         }
4282
4283                         blob1 = data_blob_const(bytes, 16);
4284                         status = GUID_from_data_blob(&blob1, &server_guid);
4285                         if (tevent_req_nterror(req, status)) {
4286                                 return;
4287                         }
4288
4289                         blob1 = data_blob_const(bytes+16, num_bytes-16);
4290                         blob2 = data_blob_dup_talloc(state, blob1);
4291                         if (blob1.length > 0 &&
4292                             tevent_req_nomem(blob2.data, req)) {
4293                                 return;
4294                         }
4295                         server_gss_blob = blob2;
4296                 } else {
4297                         DATA_BLOB blob1, blob2;
4298
4299                         if (num_bytes < key_len) {
4300                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4301                                 return;
4302                         }
4303
4304                         if (key_len != 0 && key_len != 8) {
4305                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4306                                 return;
4307                         }
4308
4309                         if (key_len == 8) {
4310                                 memcpy(server_challenge, bytes, 8);
4311                         }
4312
4313                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4314                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
4315                         if (blob1.length > 0) {
4316                                 size_t len;
4317
4318                                 len = utf16_len_n(blob1.data,
4319                                                   blob1.length);
4320                                 blob1.length = len;
4321
4322                                 ok = convert_string_talloc(state,
4323                                                            CH_UTF16LE,
4324                                                            CH_UNIX,
4325                                                            blob1.data,
4326                                                            blob1.length,
4327                                                            &server_workgroup,
4328                                                            &len);
4329                                 if (!ok) {
4330                                         status = map_nt_error_from_unix_common(errno);
4331                                         tevent_req_nterror(req, status);
4332                                         return;
4333                                 }
4334                         }
4335
4336                         blob2.data += blob1.length;
4337                         blob2.length -= blob1.length;
4338                         if (blob2.length > 0) {
4339                                 size_t len;
4340
4341                                 len = utf16_len_n(blob1.data,
4342                                                   blob1.length);
4343                                 blob1.length = len;
4344
4345                                 ok = convert_string_talloc(state,
4346                                                            CH_UTF16LE,
4347                                                            CH_UNIX,
4348                                                            blob2.data,
4349                                                            blob2.length,
4350                                                            &server_name,
4351                                                            &len);
4352                                 if (!ok) {
4353                                         status = map_nt_error_from_unix_common(errno);
4354                                         tevent_req_nterror(req, status);
4355                                         return;
4356                                 }
4357                         }
4358                 }
4359
4360                 client_signing = "disabled";
4361                 if (conn->allow_signing) {
4362                         client_signing = "allowed";
4363                 }
4364                 if (conn->mandatory_signing) {
4365                         client_signing = "required";
4366                 }
4367
4368                 server_signing = "not supported";
4369                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
4370                         server_signing = "supported";
4371                         server_allowed = true;
4372                 } else if (conn->mandatory_signing) {
4373                         /*
4374                          * We have mandatory signing as client
4375                          * lets assume the server will look at our
4376                          * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED
4377                          * flag in the session setup
4378                          */
4379                         server_signing = "not announced";
4380                         server_allowed = true;
4381                 }
4382                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
4383                         server_signing = "required";
4384                         server_mandatory = true;
4385                 }
4386
4387                 ok = smb_signing_set_negotiated(conn->smb1.signing,
4388                                                 server_allowed,
4389                                                 server_mandatory);
4390                 if (!ok) {
4391                         DEBUG(1,("cli_negprot: SMB signing is required, "
4392                                  "but client[%s] and server[%s] mismatch\n",
4393                                  client_signing, server_signing));
4394                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4395                         return;
4396                 }
4397
4398         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
4399                 DATA_BLOB blob1;
4400                 uint8_t key_len;
4401                 time_t t;
4402
4403                 if (wct != 0x0D) {
4404                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4405                         return;
4406                 }
4407
4408                 server_security_mode = SVAL(vwv + 1, 0);
4409                 server_max_xmit = SVAL(vwv + 2, 0);
4410                 server_max_mux = SVAL(vwv + 3, 0);
4411                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
4412                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
4413                 server_session_key = IVAL(vwv + 6, 0);
4414                 server_time_zone = SVALS(vwv + 10, 0);
4415                 server_time_zone *= 60;
4416                 /* this time is converted to GMT by make_unix_date */
4417                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
4418                 unix_to_nt_time(&server_system_time, t);
4419                 key_len = SVAL(vwv + 11, 0);
4420
4421                 if (num_bytes < key_len) {
4422                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4423                         return;
4424                 }
4425
4426                 if (key_len != 0 && key_len != 8) {
4427                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4428                         return;
4429                 }
4430
4431                 if (key_len == 8) {
4432                         memcpy(server_challenge, bytes, 8);
4433                 }
4434
4435                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4436                 if (blob1.length > 0) {
4437                         size_t len;
4438                         bool ok;
4439
4440                         len = utf16_len_n(blob1.data,
4441                                           blob1.length);
4442                         blob1.length = len;
4443
4444                         ok = convert_string_talloc(state,
4445                                                    CH_DOS,
4446                                                    CH_UNIX,
4447                                                    blob1.data,
4448                                                    blob1.length,
4449                                                    &server_workgroup,
4450                                                    &len);
4451                         if (!ok) {
4452                                 status = map_nt_error_from_unix_common(errno);
4453                                 tevent_req_nterror(req, status);
4454                                 return;
4455                         }
4456                 }
4457
4458         } else {
4459                 /* the old core protocol */
4460                 server_time_zone = get_time_zone(time(NULL));
4461                 server_max_xmit = 1024;
4462                 server_max_mux = 1;
4463         }
4464
4465         if (server_max_xmit < 1024) {
4466                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4467                 return;
4468         }
4469
4470         if (server_max_mux < 1) {
4471                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4472                 return;
4473         }
4474
4475         /*
4476          * Now calculate the negotiated capabilities
4477          * based on the mask for:
4478          * - client only flags
4479          * - flags used in both directions
4480          * - server only flags
4481          */
4482         both_capabilities = client_capabilities & server_capabilities;
4483         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
4484         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
4485         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
4486
4487         max_xmit = MIN(client_max_xmit, server_max_xmit);
4488
4489         conn->smb1.server.capabilities = server_capabilities;
4490         conn->smb1.capabilities = capabilities;
4491
4492         conn->smb1.server.max_xmit = server_max_xmit;
4493         conn->smb1.max_xmit = max_xmit;
4494
4495         conn->smb1.server.max_mux = server_max_mux;
4496
4497         conn->smb1.server.security_mode = server_security_mode;
4498
4499         conn->smb1.server.readbraw = server_readbraw;
4500         conn->smb1.server.writebraw = server_writebraw;
4501         conn->smb1.server.lockread = server_lockread;
4502         conn->smb1.server.writeunlock = server_writeunlock;
4503
4504         conn->smb1.server.session_key = server_session_key;
4505
4506         talloc_steal(conn, server_gss_blob.data);
4507         conn->smb1.server.gss_blob = server_gss_blob;
4508         conn->smb1.server.guid = server_guid;
4509         memcpy(conn->smb1.server.challenge, server_challenge, 8);
4510         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
4511         conn->smb1.server.name = talloc_move(conn, &server_name);
4512
4513         conn->smb1.server.time_zone = server_time_zone;
4514         conn->smb1.server.system_time = server_system_time;
4515
4516         tevent_req_done(req);
4517 }
4518
4519 static size_t smbXcli_padding_helper(uint32_t offset, size_t n)
4520 {
4521         if ((offset & (n-1)) == 0) return 0;
4522         return n - (offset & (n-1));
4523 }
4524
4525 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
4526 {
4527         size_t i;
4528         uint8_t *buf;
4529         uint16_t dialect_count = 0;
4530         DATA_BLOB dyn = data_blob_null;
4531
4532         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4533                 bool ok;
4534                 uint8_t val[2];
4535
4536                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4537                         continue;
4538                 }
4539
4540                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4541                         continue;
4542                 }
4543
4544                 SSVAL(val, 0, smb2cli_prots[i].smb2_dialect);
4545
4546                 ok = data_blob_append(state, &dyn, val, sizeof(val));
4547                 if (!ok) {
4548                         return NULL;
4549                 }
4550
4551                 dialect_count++;
4552         }
4553
4554         buf = state->smb2.fixed;
4555         SSVAL(buf, 0, 36);
4556         SSVAL(buf, 2, dialect_count);
4557         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
4558         SSVAL(buf, 6, 0);       /* Reserved */
4559         if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
4560                 SIVAL(buf, 8, state->conn->smb2.client.capabilities);
4561         } else {
4562                 SIVAL(buf, 8, 0);       /* Capabilities */
4563         }
4564         if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
4565                 NTSTATUS status;
4566                 DATA_BLOB blob;
4567
4568                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
4569                                           state, &blob);
4570                 if (!NT_STATUS_IS_OK(status)) {
4571                         return NULL;
4572                 }
4573                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
4574         } else {
4575                 memset(buf+12, 0, 16);  /* ClientGuid */
4576         }
4577
4578         if (state->conn->max_protocol >= PROTOCOL_SMB3_10) {
4579                 NTSTATUS status;
4580                 struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4581                 uint32_t offset;
4582                 DATA_BLOB b;
4583                 uint8_t p[38];
4584                 const uint8_t zeros[8] = {0, };
4585                 size_t pad;
4586                 bool ok;
4587
4588                 SSVAL(p, 0,  1); /* HashAlgorithmCount */
4589                 SSVAL(p, 2, 32); /* SaltLength */
4590                 SSVAL(p, 4, SMB2_PREAUTH_INTEGRITY_SHA512);
4591                 generate_random_buffer(p + 6, 32);
4592
4593                 b = data_blob_const(p, 38);
4594                 status = smb2_negotiate_context_add(state, &c,
4595                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
4596                 if (!NT_STATUS_IS_OK(status)) {
4597                         return NULL;
4598                 }
4599
4600                 SSVAL(p, 0, 2); /* ChiperCount */
4601                 /*
4602                  * For now we preferr CCM because our implementation
4603                  * is faster than GCM, see bug #11451.
4604                  */
4605                 SSVAL(p, 2, SMB2_ENCRYPTION_AES128_CCM);
4606                 SSVAL(p, 4, SMB2_ENCRYPTION_AES128_GCM);
4607
4608                 b = data_blob_const(p, 6);
4609                 status = smb2_negotiate_context_add(state, &c,
4610                                         SMB2_ENCRYPTION_CAPABILITIES, b);
4611                 if (!NT_STATUS_IS_OK(status)) {
4612                         return NULL;
4613                 }
4614
4615                 status = smb2_negotiate_context_push(state, &b, c);
4616                 if (!NT_STATUS_IS_OK(status)) {
4617                         return NULL;
4618                 }
4619
4620                 offset = SMB2_HDR_BODY + sizeof(state->smb2.fixed) + dyn.length;
4621                 pad = smbXcli_padding_helper(offset, 8);
4622
4623                 ok = data_blob_append(state, &dyn, zeros, pad);
4624                 if (!ok) {
4625                         return NULL;
4626                 }
4627                 offset += pad;
4628
4629                 ok = data_blob_append(state, &dyn, b.data, b.length);
4630                 if (!ok) {
4631                         return NULL;
4632                 }
4633
4634                 SIVAL(buf, 28, offset);   /* NegotiateContextOffset */
4635                 SSVAL(buf, 32, c.num_contexts); /* NegotiateContextCount */
4636                 SSVAL(buf, 34, 0);        /* Reserved */
4637         } else {
4638                 SBVAL(buf, 28, 0);      /* Reserved/ClientStartTime */
4639         }
4640
4641         return smb2cli_req_send(state, state->ev,
4642                                 state->conn, SMB2_OP_NEGPROT,
4643                                 0, 0, /* flags */
4644                                 state->timeout_msec,
4645                                 NULL, NULL, /* tcon, session */
4646                                 state->smb2.fixed, sizeof(state->smb2.fixed),
4647                                 dyn.data, dyn.length,
4648                                 UINT16_MAX); /* max_dyn_len */
4649 }
4650
4651 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
4652 {
4653         struct tevent_req *req =
4654                 tevent_req_callback_data(subreq,
4655                 struct tevent_req);
4656         struct smbXcli_negprot_state *state =
4657                 tevent_req_data(req,
4658                 struct smbXcli_negprot_state);
4659         struct smbXcli_conn *conn = state->conn;
4660         size_t security_offset, security_length;
4661         DATA_BLOB blob;
4662         NTSTATUS status;
4663         struct iovec *iov;
4664         uint8_t *body;
4665         size_t i;
4666         uint16_t dialect_revision;
4667         struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4668         uint32_t negotiate_context_offset = 0;
4669         uint16_t negotiate_context_count = 0;
4670         DATA_BLOB negotiate_context_blob = data_blob_null;
4671         size_t avail;
4672         size_t ctx_ofs;
4673         size_t needed;
4674         struct smb2_negotiate_context *preauth = NULL;
4675         uint16_t hash_count;
4676         uint16_t salt_length;
4677         uint16_t hash_selected;
4678         struct hc_sha512state sctx;
4679         struct smb2_negotiate_context *cipher = NULL;
4680         struct iovec sent_iov[3];
4681         static const struct smb2cli_req_expected_response expected[] = {
4682         {
4683                 .status = NT_STATUS_OK,
4684                 .body_size = 0x41
4685         }
4686         };
4687
4688         status = smb2cli_req_recv(subreq, state, &iov,
4689                                   expected, ARRAY_SIZE(expected));
4690         if (tevent_req_nterror(req, status)) {
4691                 return;
4692         }
4693
4694         body = (uint8_t *)iov[1].iov_base;
4695
4696         dialect_revision = SVAL(body, 4);
4697
4698         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4699                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4700                         continue;
4701                 }
4702
4703                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4704                         continue;
4705                 }
4706
4707                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
4708                         continue;
4709                 }
4710
4711                 conn->protocol = smb2cli_prots[i].proto;
4712                 break;
4713         }
4714
4715         if (conn->protocol == PROTOCOL_NONE) {
4716                 TALLOC_FREE(subreq);
4717
4718                 if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
4719                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4720                         return;
4721                 }
4722
4723                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
4724                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4725                         return;
4726                 }
4727
4728                 /* make sure we do not loop forever */
4729                 state->conn->min_protocol = PROTOCOL_SMB2_02;
4730
4731                 /*
4732                  * send a SMB2 negprot, in order to negotiate
4733                  * the SMB2 dialect.
4734                  */
4735                 subreq = smbXcli_negprot_smb2_subreq(state);
4736                 if (tevent_req_nomem(subreq, req)) {
4737                         return;
4738                 }
4739                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4740                 return;
4741         }
4742
4743         conn->smb2.server.security_mode = SVAL(body, 2);
4744         if (conn->protocol >= PROTOCOL_SMB3_10) {
4745                 negotiate_context_count = SVAL(body, 6);
4746         }
4747
4748         blob = data_blob_const(body + 8, 16);
4749         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
4750         if (tevent_req_nterror(req, status)) {
4751                 return;
4752         }
4753
4754         conn->smb2.server.capabilities  = IVAL(body, 24);
4755         conn->smb2.server.max_trans_size= IVAL(body, 28);
4756         conn->smb2.server.max_read_size = IVAL(body, 32);
4757         conn->smb2.server.max_write_size= IVAL(body, 36);
4758         conn->smb2.server.system_time   = BVAL(body, 40);
4759         conn->smb2.server.start_time    = BVAL(body, 48);
4760
4761         security_offset = SVAL(body, 56);
4762         security_length = SVAL(body, 58);
4763
4764         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
4765                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4766                 return;
4767         }
4768
4769         if (security_length > iov[2].iov_len) {
4770                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4771                 return;
4772         }
4773
4774         conn->smb2.server.gss_blob = data_blob_talloc(conn,
4775                                                 iov[2].iov_base,
4776                                                 security_length);
4777         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
4778                 return;
4779         }
4780
4781         if (conn->protocol < PROTOCOL_SMB3_10) {
4782                 TALLOC_FREE(subreq);
4783
4784                 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4785                         conn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
4786                 }
4787                 tevent_req_done(req);
4788                 return;
4789         }
4790
4791         if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4792                 tevent_req_nterror(req,
4793                                 NT_STATUS_INVALID_NETWORK_RESPONSE);
4794                 return;
4795         }
4796
4797         negotiate_context_offset = IVAL(body, 60);
4798         if (negotiate_context_offset < security_offset) {
4799                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4800                 return;
4801         }
4802
4803         ctx_ofs = negotiate_context_offset - security_offset;
4804         if (ctx_ofs > iov[2].iov_len) {
4805                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4806                 return;
4807         }
4808         avail = iov[2].iov_len - security_length;
4809         needed = iov[2].iov_len - ctx_ofs;
4810         if (needed > avail) {
4811                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4812                 return;
4813         }
4814
4815         negotiate_context_blob.data = (uint8_t *)iov[2].iov_base;
4816         negotiate_context_blob.length = iov[2].iov_len;
4817
4818         negotiate_context_blob.data += ctx_ofs;
4819         negotiate_context_blob.length -= ctx_ofs;
4820
4821         status = smb2_negotiate_context_parse(state, negotiate_context_blob, &c);
4822         if (tevent_req_nterror(req, status)) {
4823                 return;
4824         }
4825
4826         if (negotiate_context_count != c.num_contexts) {
4827                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4828                 return;
4829         }
4830
4831         preauth = smb2_negotiate_context_find(&c,
4832                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
4833         if (preauth == NULL) {
4834                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4835                 return;
4836         }
4837
4838         if (preauth->data.length < 6) {
4839                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4840                 return;
4841         }
4842
4843         hash_count = SVAL(preauth->data.data, 0);
4844         salt_length = SVAL(preauth->data.data, 2);
4845         hash_selected = SVAL(preauth->data.data, 4);
4846
4847         if (hash_count != 1) {
4848                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4849                 return;
4850         }
4851
4852         if (preauth->data.length != (6 + salt_length)) {
4853                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4854                 return;
4855         }
4856
4857         if (hash_selected != SMB2_PREAUTH_INTEGRITY_SHA512) {
4858                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4859                 return;
4860         }
4861
4862         cipher = smb2_negotiate_context_find(&c, SMB2_ENCRYPTION_CAPABILITIES);
4863         if (cipher != NULL) {
4864                 uint16_t cipher_count;
4865
4866                 if (cipher->data.length < 2) {
4867                         tevent_req_nterror(req,
4868                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4869                         return;
4870                 }
4871
4872                 cipher_count = SVAL(cipher->data.data, 0);
4873
4874                 if (cipher_count > 1) {
4875                         tevent_req_nterror(req,
4876                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4877                         return;
4878                 }
4879
4880                 if (cipher->data.length != (2 + 2 * cipher_count)) {
4881                         tevent_req_nterror(req,
4882                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4883                         return;
4884                 }
4885
4886                 if (cipher_count == 1) {
4887                         uint16_t cipher_selected;
4888
4889                         cipher_selected = SVAL(cipher->data.data, 2);
4890
4891                         switch (cipher_selected) {
4892                         case SMB2_ENCRYPTION_AES128_GCM:
4893                         case SMB2_ENCRYPTION_AES128_CCM:
4894                                 conn->smb2.server.cipher = cipher_selected;
4895                                 break;
4896                         }
4897                 }
4898         }
4899
4900         /* First we hash the request */
4901         smb2cli_req_get_sent_iov(subreq, sent_iov);
4902         samba_SHA512_Init(&sctx);
4903         samba_SHA512_Update(&sctx, conn->smb2.preauth_sha512,
4904                       sizeof(conn->smb2.preauth_sha512));
4905         for (i = 0; i < 3; i++) {
4906                 samba_SHA512_Update(&sctx, sent_iov[i].iov_base, sent_iov[i].iov_len);
4907         }
4908         samba_SHA512_Final(conn->smb2.preauth_sha512, &sctx);
4909         TALLOC_FREE(subreq);
4910
4911         /* And now we hash the response */
4912         samba_SHA512_Init(&sctx);
4913         samba_SHA512_Update(&sctx, conn->smb2.preauth_sha512,
4914                       sizeof(conn->smb2.preauth_sha512));
4915         for (i = 0; i < 3; i++) {
4916                 samba_SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
4917         }
4918         samba_SHA512_Final(conn->smb2.preauth_sha512, &sctx);
4919
4920         tevent_req_done(req);
4921 }
4922
4923 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
4924                                                   TALLOC_CTX *tmp_mem,
4925                                                   uint8_t *inbuf)
4926 {
4927         size_t num_pending = talloc_array_length(conn->pending);
4928         struct tevent_req *subreq;
4929         struct smbXcli_req_state *substate;
4930         struct tevent_req *req;
4931         uint32_t protocol_magic;
4932         size_t inbuf_len = smb_len_nbt(inbuf);
4933
4934         if (num_pending != 1) {
4935                 return NT_STATUS_INTERNAL_ERROR;
4936         }
4937
4938         if (inbuf_len < 4) {
4939                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
4940         }
4941
4942         subreq = conn->pending[0];
4943         substate = tevent_req_data(subreq, struct smbXcli_req_state);
4944         req = tevent_req_callback_data(subreq, struct tevent_req);
4945
4946         protocol_magic = IVAL(inbuf, 4);
4947
4948         switch (protocol_magic) {
4949         case SMB_MAGIC:
4950                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4951                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4952                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4953
4954         case SMB2_MAGIC:
4955                 if (substate->smb2.recv_iov == NULL) {
4956                         /*
4957                          * For the SMB1 negprot we have move it.
4958                          */
4959                         substate->smb2.recv_iov = substate->smb1.recv_iov;
4960                         substate->smb1.recv_iov = NULL;
4961                 }
4962
4963                 /*
4964                  * we got an SMB2 answer, which consumed sequence number 0
4965                  * so we need to use 1 as the next one.
4966                  *
4967                  * we also need to set the current credits to 0
4968                  * as we consumed the initial one. The SMB2 answer
4969                  * hopefully grant us a new credit.
4970                  */
4971                 conn->smb2.mid = 1;
4972                 conn->smb2.cur_credits = 0;
4973                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4974                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4975                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4976         }
4977
4978         DEBUG(10, ("Got non-SMB PDU\n"));
4979         return NT_STATUS_INVALID_NETWORK_RESPONSE;
4980 }
4981
4982 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
4983 {
4984         return tevent_req_simple_recv_ntstatus(req);
4985 }
4986
4987 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
4988                          uint32_t timeout_msec,
4989                          enum protocol_types min_protocol,
4990                          enum protocol_types max_protocol)
4991 {
4992         TALLOC_CTX *frame = talloc_stackframe();
4993         struct tevent_context *ev;
4994         struct tevent_req *req;
4995         NTSTATUS status = NT_STATUS_NO_MEMORY;
4996         bool ok;
4997
4998         if (smbXcli_conn_has_async_calls(conn)) {
4999                 /*
5000                  * Can't use sync call while an async call is in flight
5001                  */
5002                 status = NT_STATUS_INVALID_PARAMETER_MIX;
5003                 goto fail;
5004         }
5005         ev = samba_tevent_context_init(frame);
5006         if (ev == NULL) {
5007                 goto fail;
5008         }
5009         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
5010                                    min_protocol, max_protocol);
5011         if (req == NULL) {
5012                 goto fail;
5013         }
5014         ok = tevent_req_poll_ntstatus(req, ev, &status);
5015         if (!ok) {
5016                 goto fail;
5017         }
5018         status = smbXcli_negprot_recv(req);
5019  fail:
5020         TALLOC_FREE(frame);
5021         return status;
5022 }
5023
5024 struct smb2cli_validate_negotiate_info_state {
5025         struct smbXcli_conn *conn;
5026         DATA_BLOB in_input_buffer;
5027         DATA_BLOB in_output_buffer;
5028         DATA_BLOB out_input_buffer;
5029         DATA_BLOB out_output_buffer;
5030         uint16_t dialect;
5031 };
5032
5033 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq);
5034
5035 struct tevent_req *smb2cli_validate_negotiate_info_send(TALLOC_CTX *mem_ctx,
5036                                                 struct tevent_context *ev,
5037                                                 struct smbXcli_conn *conn,
5038                                                 uint32_t timeout_msec,
5039                                                 struct smbXcli_session *session,
5040                                                 struct smbXcli_tcon *tcon)
5041 {
5042         struct tevent_req *req;
5043         struct smb2cli_validate_negotiate_info_state *state;
5044         uint8_t *buf;
5045         uint16_t dialect_count = 0;
5046         struct tevent_req *subreq;
5047         bool _save_should_sign;
5048         size_t i;
5049
5050         req = tevent_req_create(mem_ctx, &state,
5051                                 struct smb2cli_validate_negotiate_info_state);
5052         if (req == NULL) {
5053                 return NULL;
5054         }
5055         state->conn = conn;
5056
5057         state->in_input_buffer = data_blob_talloc_zero(state,
5058                                         4 + 16 + 1 + 1 + 2);
5059         if (tevent_req_nomem(state->in_input_buffer.data, req)) {
5060                 return tevent_req_post(req, ev);
5061         }
5062         buf = state->in_input_buffer.data;
5063
5064         if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
5065                 SIVAL(buf, 0, conn->smb2.client.capabilities);
5066         } else {
5067                 SIVAL(buf, 0, 0); /* Capabilities */
5068         }
5069         if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
5070                 NTSTATUS status;
5071                 DATA_BLOB blob;
5072
5073                 status = GUID_to_ndr_blob(&conn->smb2.client.guid,
5074                                           state, &blob);
5075                 if (!NT_STATUS_IS_OK(status)) {
5076                         return NULL;
5077                 }
5078                 memcpy(buf+4, blob.data, 16); /* ClientGuid */
5079         } else {
5080                 memset(buf+4, 0, 16);   /* ClientGuid */
5081         }
5082         if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
5083                 SCVAL(buf, 20, conn->smb2.client.security_mode);
5084         } else {
5085                 SCVAL(buf, 20, 0);
5086         }
5087         SCVAL(buf, 21, 0); /* reserved */
5088
5089         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
5090                 bool ok;
5091                 size_t ofs;
5092
5093                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
5094                         continue;
5095                 }
5096
5097                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
5098                         continue;
5099                 }
5100
5101                 if (smb2cli_prots[i].proto == state->conn->protocol) {
5102                         state->dialect = smb2cli_prots[i].smb2_dialect;
5103                 }
5104
5105                 ofs = state->in_input_buffer.length;
5106                 ok = data_blob_realloc(state, &state->in_input_buffer,
5107                                        ofs + 2);
5108                 if (!ok) {
5109                         tevent_req_oom(req);
5110                         return tevent_req_post(req, ev);
5111                 }
5112
5113                 buf = state->in_input_buffer.data;
5114                 SSVAL(buf, ofs, smb2cli_prots[i].smb2_dialect);
5115
5116                 dialect_count++;
5117         }
5118         buf = state->in_input_buffer.data;
5119         SSVAL(buf, 22, dialect_count);
5120
5121         _save_should_sign = smb2cli_tcon_is_signing_on(tcon);
5122         smb2cli_tcon_should_sign(tcon, true);
5123         subreq = smb2cli_ioctl_send(state, ev, conn,
5124                                     timeout_msec, session, tcon,
5125                                     UINT64_MAX, /* in_fid_persistent */
5126                                     UINT64_MAX, /* in_fid_volatile */
5127                                     FSCTL_VALIDATE_NEGOTIATE_INFO,
5128                                     0, /* in_max_input_length */
5129                                     &state->in_input_buffer,
5130                                     24, /* in_max_output_length */
5131                                     &state->in_output_buffer,
5132                                     SMB2_IOCTL_FLAG_IS_FSCTL);
5133         smb2cli_tcon_should_sign(tcon, _save_should_sign);
5134         if (tevent_req_nomem(subreq, req)) {
5135                 return tevent_req_post(req, ev);
5136         }
5137         tevent_req_set_callback(subreq,
5138                                 smb2cli_validate_negotiate_info_done,
5139                                 req);
5140
5141         return req;
5142 }
5143
5144 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq)
5145 {
5146         struct tevent_req *req =
5147                 tevent_req_callback_data(subreq,
5148                 struct tevent_req);
5149         struct smb2cli_validate_negotiate_info_state *state =
5150                 tevent_req_data(req,
5151                 struct smb2cli_validate_negotiate_info_state);
5152         NTSTATUS status;
5153         const uint8_t *buf;
5154         uint32_t capabilities;
5155         DATA_BLOB guid_blob;
5156         struct GUID server_guid;
5157         uint16_t security_mode;
5158         uint16_t dialect;
5159
5160         status = smb2cli_ioctl_recv(subreq, state,
5161                                     &state->out_input_buffer,
5162                                     &state->out_output_buffer);
5163         TALLOC_FREE(subreq);
5164         if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED)) {
5165                 /*
5166                  * The response was signed, but not supported
5167                  *
5168                  * Older Windows and Samba releases return
5169                  * NT_STATUS_FILE_CLOSED.
5170                  */
5171                 tevent_req_done(req);
5172                 return;
5173         }
5174         if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_DEVICE_REQUEST)) {
5175                 /*
5176                  * The response was signed, but not supported
5177                  *
5178                  * This is returned by the NTVFS based Samba 4.x file server
5179                  * for file shares.
5180                  */
5181                 tevent_req_done(req);
5182                 return;
5183         }
5184         if (NT_STATUS_EQUAL(status, NT_STATUS_FS_DRIVER_REQUIRED)) {
5185                 /*
5186                  * The response was signed, but not supported
5187                  *
5188                  * This is returned by the NTVFS based Samba 4.x file server
5189                  * for ipc shares.
5190                  */
5191                 tevent_req_done(req);
5192                 return;
5193         }
5194         if (tevent_req_nterror(req, status)) {
5195                 return;
5196         }
5197
5198         if (state->out_output_buffer.length != 24) {
5199                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
5200                 return;
5201         }
5202
5203         buf = state->out_output_buffer.data;
5204
5205         capabilities = IVAL(buf, 0);
5206         guid_blob = data_blob_const(buf + 4, 16);
5207         status = GUID_from_data_blob(&guid_blob, &server_guid);
5208         if (tevent_req_nterror(req, status)) {
5209                 return;
5210         }
5211         security_mode = CVAL(buf, 20);
5212         dialect = SVAL(buf, 22);
5213
5214         if (capabilities != state->conn->smb2.server.capabilities) {
5215                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5216                 return;
5217         }
5218
5219         if (!GUID_equal(&server_guid, &state->conn->smb2.server.guid)) {
5220                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5221                 return;
5222         }
5223
5224         if (security_mode != state->conn->smb2.server.security_mode) {
5225                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5226                 return;
5227         }
5228
5229         if (dialect != state->dialect) {
5230                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5231                 return;
5232         }
5233
5234         tevent_req_done(req);
5235 }
5236
5237 NTSTATUS smb2cli_validate_negotiate_info_recv(struct tevent_req *req)
5238 {
5239         return tevent_req_simple_recv_ntstatus(req);
5240 }
5241
5242 static int smbXcli_session_destructor(struct smbXcli_session *session)
5243 {
5244         if (session->conn == NULL) {
5245                 return 0;
5246         }
5247
5248         DLIST_REMOVE(session->conn->sessions, session);
5249         return 0;
5250 }
5251
5252 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
5253                                                struct smbXcli_conn *conn)
5254 {
5255         struct smbXcli_session *session;
5256
5257         session = talloc_zero(mem_ctx, struct smbXcli_session);
5258         if (session == NULL) {
5259                 return NULL;
5260         }
5261         session->smb2 = talloc_zero(session, struct smb2cli_session);
5262         if (session->smb2 == NULL) {
5263                 talloc_free(session);
5264                 return NULL;
5265         }
5266         talloc_set_destructor(session, smbXcli_session_destructor);
5267
5268         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
5269         session->conn = conn;
5270
5271         memcpy(session->smb2_channel.preauth_sha512,
5272                conn->smb2.preauth_sha512,
5273                sizeof(session->smb2_channel.preauth_sha512));
5274
5275         return session;
5276 }
5277
5278 struct smbXcli_session *smbXcli_session_copy(TALLOC_CTX *mem_ctx,
5279                                                 struct smbXcli_session *src)
5280 {
5281         struct smbXcli_session *session;
5282
5283         session = talloc_zero(mem_ctx, struct smbXcli_session);
5284         if (session == NULL) {
5285                 return NULL;
5286         }
5287         session->smb2 = talloc_zero(session, struct smb2cli_session);
5288         if (session->smb2 == NULL) {
5289                 talloc_free(session);
5290                 return NULL;
5291         }
5292
5293         session->conn = src->conn;
5294         *session->smb2 = *src->smb2;
5295         session->smb2_channel = src->smb2_channel;
5296         session->disconnect_expired = src->disconnect_expired;
5297
5298         DLIST_ADD_END(src->conn->sessions, session, struct smbXcli_session *);
5299         talloc_set_destructor(session, smbXcli_session_destructor);
5300
5301         return session;
5302 }
5303
5304 bool smbXcli_session_is_authenticated(struct smbXcli_session *session)
5305 {
5306         const DATA_BLOB *application_key;
5307
5308         if (session->conn == NULL) {
5309                 return false;
5310         }
5311
5312         /*
5313          * If we have an application key we had a session key negotiated
5314          * at auth time.
5315          */
5316         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5317                 application_key = &session->smb2->application_key;
5318         } else {
5319                 application_key = &session->smb1.application_key;
5320         }
5321
5322         if (application_key->length == 0) {
5323                 return false;
5324         }
5325
5326         return true;
5327 }
5328
5329 NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session,
5330                                          TALLOC_CTX *mem_ctx,
5331                                          DATA_BLOB *key)
5332 {
5333         const DATA_BLOB *application_key;
5334
5335         *key = data_blob_null;
5336
5337         if (session->conn == NULL) {
5338                 return NT_STATUS_NO_USER_SESSION_KEY;
5339         }
5340
5341         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5342                 application_key = &session->smb2->application_key;
5343         } else {
5344                 application_key = &session->smb1.application_key;
5345         }
5346
5347         if (application_key->length == 0) {
5348                 return NT_STATUS_NO_USER_SESSION_KEY;
5349         }
5350
5351         *key = data_blob_dup_talloc(mem_ctx, *application_key);
5352         if (key->data == NULL) {
5353                 return NT_STATUS_NO_MEMORY;
5354         }
5355
5356         return NT_STATUS_OK;
5357 }
5358
5359 void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session)
5360 {
5361         session->disconnect_expired = true;
5362 }
5363
5364 uint16_t smb1cli_session_current_id(struct smbXcli_session *session)
5365 {
5366         return session->smb1.session_id;
5367 }
5368
5369 void smb1cli_session_set_id(struct smbXcli_session *session,
5370                             uint16_t session_id)
5371 {
5372         session->smb1.session_id = session_id;
5373 }
5374
5375 NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session,
5376                                          const DATA_BLOB _session_key)
5377 {
5378         struct smbXcli_conn *conn = session->conn;
5379         uint8_t session_key[16];
5380
5381         if (conn == NULL) {
5382                 return NT_STATUS_INVALID_PARAMETER_MIX;
5383         }
5384
5385         if (session->smb1.application_key.length != 0) {
5386                 /*
5387                  * TODO: do not allow this...
5388                  *
5389                  * return NT_STATUS_INVALID_PARAMETER_MIX;
5390                  */
5391                 data_blob_clear_free(&session->smb1.application_key);
5392                 session->smb1.protected_key = false;
5393         }
5394
5395         if (_session_key.length == 0) {
5396                 return NT_STATUS_OK;
5397         }
5398
5399         ZERO_STRUCT(session_key);
5400         memcpy(session_key, _session_key.data,
5401                MIN(_session_key.length, sizeof(session_key)));
5402
5403         session->smb1.application_key = data_blob_talloc(session,
5404                                                          session_key,
5405                                                          sizeof(session_key));
5406         ZERO_STRUCT(session_key);
5407         if (session->smb1.application_key.data == NULL) {
5408                 return NT_STATUS_NO_MEMORY;
5409         }
5410
5411         session->smb1.protected_key = false;
5412
5413         return NT_STATUS_OK;
5414 }
5415
5416 NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session)
5417 {
5418         if (session->smb1.protected_key) {
5419                 /* already protected */
5420                 return NT_STATUS_OK;
5421         }
5422
5423         if (session->smb1.application_key.length != 16) {
5424                 return NT_STATUS_INVALID_PARAMETER_MIX;
5425         }
5426
5427         smb_key_derivation(session->smb1.application_key.data,
5428                            session->smb1.application_key.length,
5429                            session->smb1.application_key.data);
5430
5431         session->smb1.protected_key = true;
5432
5433         return NT_STATUS_OK;
5434 }
5435
5436 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
5437 {
5438         struct smbXcli_conn *conn = session->conn;
5439         uint8_t security_mode = 0;
5440
5441         if (conn == NULL) {
5442                 return security_mode;
5443         }
5444
5445         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
5446         if (conn->mandatory_signing) {
5447                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
5448         }
5449
5450         return security_mode;
5451 }
5452
5453 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
5454 {
5455         return session->smb2->session_id;
5456 }
5457
5458 uint16_t smb2cli_session_get_flags(struct smbXcli_session *session)
5459 {
5460         return session->smb2->session_flags;
5461 }
5462
5463 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
5464                                       uint64_t session_id,
5465                                       uint16_t session_flags)
5466 {
5467         session->smb2->session_id = session_id;
5468         session->smb2->session_flags = session_flags;
5469 }
5470
5471 void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session)
5472 {
5473         session->smb2->channel_sequence += 1;
5474 }
5475
5476 uint16_t smb2cli_session_reset_channel_sequence(struct smbXcli_session *session,
5477                                                 uint16_t channel_sequence)
5478 {
5479         uint16_t prev_cs;
5480
5481         prev_cs = session->smb2->channel_sequence;
5482         session->smb2->channel_sequence = channel_sequence;
5483
5484         return prev_cs;
5485 }
5486
5487 void smb2cli_session_start_replay(struct smbXcli_session *session)
5488 {
5489         session->smb2->replay_active = true;
5490 }
5491
5492 void smb2cli_session_stop_replay(struct smbXcli_session *session)
5493 {
5494         session->smb2->replay_active = false;
5495 }
5496
5497 NTSTATUS smb2cli_session_update_preauth(struct smbXcli_session *session,
5498                                         const struct iovec *iov)
5499 {
5500         struct hc_sha512state sctx;
5501         size_t i;
5502
5503         if (session->conn == NULL) {
5504                 return NT_STATUS_INTERNAL_ERROR;
5505         }
5506
5507         if (session->conn->protocol < PROTOCOL_SMB3_10) {
5508                 return NT_STATUS_OK;
5509         }
5510
5511         if (session->smb2_channel.signing_key.length != 0) {
5512                 return NT_STATUS_OK;
5513         }
5514
5515         samba_SHA512_Init(&sctx);
5516         samba_SHA512_Update(&sctx, session->smb2_channel.preauth_sha512,
5517                       sizeof(session->smb2_channel.preauth_sha512));
5518         for (i = 0; i < 3; i++) {
5519                 samba_SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
5520         }
5521         samba_SHA512_Final(session->smb2_channel.preauth_sha512, &sctx);
5522
5523         return NT_STATUS_OK;
5524 }
5525
5526 NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
5527                                          const DATA_BLOB _session_key,
5528                                          const struct iovec *recv_iov)
5529 {
5530         struct smbXcli_conn *conn = session->conn;
5531         uint16_t no_sign_flags;
5532         uint8_t session_key[16];
5533         bool check_signature = true;
5534         uint32_t hdr_flags;
5535         NTSTATUS status;
5536         struct _derivation {
5537                 DATA_BLOB label;
5538                 DATA_BLOB context;
5539         };
5540         struct {
5541                 struct _derivation signing;
5542                 struct _derivation encryption;
5543                 struct _derivation decryption;
5544                 struct _derivation application;
5545         } derivation = { };
5546         size_t nonce_size = 0;
5547
5548         if (conn == NULL) {
5549                 return NT_STATUS_INVALID_PARAMETER_MIX;
5550         }
5551
5552         if (recv_iov[0].iov_len != SMB2_HDR_BODY) {
5553                 return NT_STATUS_INVALID_PARAMETER_MIX;
5554         }
5555
5556         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
5557
5558         if (session->smb2->session_flags & no_sign_flags) {
5559                 session->smb2->should_sign = false;
5560                 return NT_STATUS_OK;
5561         }
5562
5563         if (session->smb2->signing_key.length != 0) {
5564                 return NT_STATUS_INVALID_PARAMETER_MIX;
5565         }
5566
5567         if (conn->protocol >= PROTOCOL_SMB3_10) {
5568                 struct _derivation *d;
5569                 DATA_BLOB p;
5570
5571                 p = data_blob_const(session->smb2_channel.preauth_sha512,
5572                                 sizeof(session->smb2_channel.preauth_sha512));
5573
5574                 d = &derivation.signing;
5575                 d->label = data_blob_string_const_null("SMBSigningKey");
5576                 d->context = p;
5577
5578                 d = &derivation.encryption;
5579                 d->label = data_blob_string_const_null("SMBC2SCipherKey");
5580                 d->context = p;
5581
5582                 d = &derivation.decryption;
5583                 d->label = data_blob_string_const_null("SMBS2CCipherKey");
5584                 d->context = p;
5585
5586                 d = &derivation.application;
5587                 d->label = data_blob_string_const_null("SMBAppKey");
5588                 d->context = p;
5589
5590         } else if (conn->protocol >= PROTOCOL_SMB2_24) {
5591                 struct _derivation *d;
5592
5593                 d = &derivation.signing;
5594                 d->label = data_blob_string_const_null("SMB2AESCMAC");
5595                 d->context = data_blob_string_const_null("SmbSign");
5596
5597                 d = &derivation.encryption;
5598                 d->label = data_blob_string_const_null("SMB2AESCCM");
5599                 d->context = data_blob_string_const_null("ServerIn ");
5600
5601                 d = &derivation.decryption;
5602                 d->label = data_blob_string_const_null("SMB2AESCCM");
5603                 d->context = data_blob_string_const_null("ServerOut");
5604
5605                 d = &derivation.application;
5606                 d->label = data_blob_string_const_null("SMB2APP");
5607                 d->context = data_blob_string_const_null("SmbRpc");
5608         }
5609
5610         ZERO_STRUCT(session_key);
5611         memcpy(session_key, _session_key.data,
5612                MIN(_session_key.length, sizeof(session_key)));
5613
5614         session->smb2->signing_key = data_blob_talloc(session,
5615                                                      session_key,
5616                                                      sizeof(session_key));
5617         if (session->smb2->signing_key.data == NULL) {
5618                 ZERO_STRUCT(session_key);
5619                 return NT_STATUS_NO_MEMORY;
5620         }
5621
5622         if (conn->protocol >= PROTOCOL_SMB2_24) {
5623                 struct _derivation *d = &derivation.signing;
5624
5625                 smb2_key_derivation(session_key, sizeof(session_key),
5626                                     d->label.data, d->label.length,
5627                                     d->context.data, d->context.length,
5628                                     session->smb2->signing_key.data);
5629         }
5630
5631         session->smb2->encryption_key = data_blob_dup_talloc(session,
5632                                                 session->smb2->signing_key);
5633         if (session->smb2->encryption_key.data == NULL) {
5634                 ZERO_STRUCT(session_key);
5635                 return NT_STATUS_NO_MEMORY;
5636         }
5637
5638         if (conn->protocol >= PROTOCOL_SMB2_24) {
5639                 struct _derivation *d = &derivation.encryption;
5640
5641                 smb2_key_derivation(session_key, sizeof(session_key),
5642                                     d->label.data, d->label.length,
5643                                     d->context.data, d->context.length,
5644                                     session->smb2->encryption_key.data);
5645         }
5646
5647         session->smb2->decryption_key = data_blob_dup_talloc(session,
5648                                                 session->smb2->signing_key);
5649         if (session->smb2->decryption_key.data == NULL) {
5650                 ZERO_STRUCT(session_key);
5651                 return NT_STATUS_NO_MEMORY;
5652         }
5653
5654         if (conn->protocol >= PROTOCOL_SMB2_24) {
5655                 struct _derivation *d = &derivation.decryption;
5656
5657                 smb2_key_derivation(session_key, sizeof(session_key),
5658                                     d->label.data, d->label.length,
5659                                     d->context.data, d->context.length,
5660                                     session->smb2->decryption_key.data);
5661         }
5662
5663         session->smb2->application_key = data_blob_dup_talloc(session,
5664                                                 session->smb2->signing_key);
5665         if (session->smb2->application_key.data == NULL) {
5666                 ZERO_STRUCT(session_key);
5667                 return NT_STATUS_NO_MEMORY;
5668         }
5669
5670         if (conn->protocol >= PROTOCOL_SMB2_24) {
5671                 struct _derivation *d = &derivation.application;
5672
5673                 smb2_key_derivation(session_key, sizeof(session_key),
5674                                     d->label.data, d->label.length,
5675                                     d->context.data, d->context.length,
5676                                     session->smb2->application_key.data);
5677         }
5678         ZERO_STRUCT(session_key);
5679
5680         session->smb2_channel.signing_key = data_blob_dup_talloc(session,
5681                                                 session->smb2->signing_key);
5682         if (session->smb2_channel.signing_key.data == NULL) {
5683                 return NT_STATUS_NO_MEMORY;
5684         }
5685
5686         check_signature = conn->mandatory_signing;
5687
5688         hdr_flags = IVAL(recv_iov[0].iov_base, SMB2_HDR_FLAGS);
5689         if (hdr_flags & SMB2_HDR_FLAG_SIGNED) {
5690                 /*
5691                  * Sadly some vendors don't sign the
5692                  * final SMB2 session setup response
5693                  *
5694                  * At least Windows and Samba are always doing this
5695                  * if there's a session key available.
5696                  *
5697                  * We only check the signature if it's mandatory
5698                  * or SMB2_HDR_FLAG_SIGNED is provided.
5699                  */
5700                 check_signature = true;
5701         }
5702
5703         if (conn->protocol >= PROTOCOL_SMB3_10) {
5704                 check_signature = true;
5705         }
5706
5707         if (check_signature) {
5708                 status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
5709                                                 session->conn->protocol,
5710                                                 recv_iov, 3);
5711                 if (!NT_STATUS_IS_OK(status)) {
5712                         return status;
5713                 }
5714         }
5715
5716         session->smb2->should_sign = false;
5717         session->smb2->should_encrypt = false;
5718
5719         if (conn->desire_signing) {
5720                 session->smb2->should_sign = true;
5721         }
5722
5723         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
5724                 session->smb2->should_sign = true;
5725         }
5726
5727         if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
5728                 session->smb2->should_encrypt = true;
5729         }
5730
5731         if (conn->protocol < PROTOCOL_SMB2_24) {
5732                 session->smb2->should_encrypt = false;
5733         }
5734
5735         if (conn->smb2.server.cipher == 0) {
5736                 session->smb2->should_encrypt = false;
5737         }
5738
5739         /*
5740          * CCM and GCM algorithms must never have their
5741          * nonce wrap, or the security of the whole
5742          * communication and the keys is destroyed.
5743          * We must drop the connection once we have
5744          * transfered too much data.
5745          *
5746          * NOTE: We assume nonces greater than 8 bytes.
5747          */
5748         generate_random_buffer((uint8_t *)&session->smb2->nonce_high_random,
5749                                sizeof(session->smb2->nonce_high_random));
5750         switch (conn->smb2.server.cipher) {
5751         case SMB2_ENCRYPTION_AES128_CCM:
5752                 nonce_size = AES_CCM_128_NONCE_SIZE;
5753                 break;
5754         case SMB2_ENCRYPTION_AES128_GCM:
5755                 nonce_size = AES_GCM_128_IV_SIZE;
5756                 break;
5757         default:
5758                 nonce_size = 0;
5759                 break;
5760         }
5761         session->smb2->nonce_high_max = SMB2_NONCE_HIGH_MAX(nonce_size);
5762         session->smb2->nonce_high = 0;
5763         session->smb2->nonce_low = 0;
5764
5765         return NT_STATUS_OK;
5766 }
5767
5768 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
5769                                         struct smbXcli_session *session1,
5770                                         struct smbXcli_conn *conn,
5771                                         struct smbXcli_session **_session2)
5772 {
5773         struct smbXcli_session *session2;
5774
5775         if (session1->smb2->signing_key.length == 0) {
5776                 return NT_STATUS_INVALID_PARAMETER_MIX;
5777         }
5778
5779         if (conn == NULL) {
5780                 return NT_STATUS_INVALID_PARAMETER_MIX;
5781         }
5782
5783         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
5784         if (session2 == NULL) {
5785                 return NT_STATUS_NO_MEMORY;
5786         }
5787         session2->smb2 = talloc_reference(session2, session1->smb2);
5788         if (session2->smb2 == NULL) {
5789                 talloc_free(session2);
5790                 return NT_STATUS_NO_MEMORY;
5791         }
5792
5793         talloc_set_destructor(session2, smbXcli_session_destructor);
5794         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
5795         session2->conn = conn;
5796
5797         memcpy(session2->smb2_channel.preauth_sha512,
5798                conn->smb2.preauth_sha512,
5799                sizeof(session2->smb2_channel.preauth_sha512));
5800
5801         *_session2 = session2;
5802         return NT_STATUS_OK;
5803 }
5804
5805 NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
5806                                          const DATA_BLOB _channel_key,
5807                                          const struct iovec *recv_iov)
5808 {
5809         struct smbXcli_conn *conn = session->conn;
5810         uint8_t channel_key[16];
5811         NTSTATUS status;
5812         struct _derivation {
5813                 DATA_BLOB label;
5814                 DATA_BLOB context;
5815         };
5816         struct {
5817                 struct _derivation signing;
5818         } derivation = { };
5819
5820         if (conn == NULL) {
5821                 return NT_STATUS_INVALID_PARAMETER_MIX;
5822         }
5823
5824         if (session->smb2_channel.signing_key.length != 0) {
5825                 return NT_STATUS_INVALID_PARAMETER_MIX;
5826         }
5827
5828         if (conn->protocol >= PROTOCOL_SMB3_10) {
5829                 struct _derivation *d;
5830                 DATA_BLOB p;
5831
5832                 p = data_blob_const(session->smb2_channel.preauth_sha512,
5833                                 sizeof(session->smb2_channel.preauth_sha512));
5834
5835                 d = &derivation.signing;
5836                 d->label = data_blob_string_const_null("SMBSigningKey");
5837                 d->context = p;
5838         } else if (conn->protocol >= PROTOCOL_SMB2_24) {
5839                 struct _derivation *d;
5840
5841                 d = &derivation.signing;
5842                 d->label = data_blob_string_const_null("SMB2AESCMAC");
5843                 d->context = data_blob_string_const_null("SmbSign");
5844         }
5845
5846         ZERO_STRUCT(channel_key);
5847         memcpy(channel_key, _channel_key.data,
5848                MIN(_channel_key.length, sizeof(channel_key)));
5849
5850         session->smb2_channel.signing_key = data_blob_talloc(session,
5851                                                 channel_key,
5852                                                 sizeof(channel_key));
5853         if (session->smb2_channel.signing_key.data == NULL) {
5854                 ZERO_STRUCT(channel_key);
5855                 return NT_STATUS_NO_MEMORY;
5856         }
5857
5858         if (conn->protocol >= PROTOCOL_SMB2_24) {
5859                 struct _derivation *d = &derivation.signing;
5860
5861                 smb2_key_derivation(channel_key, sizeof(channel_key),
5862                                     d->label.data, d->label.length,
5863                                     d->context.data, d->context.length,
5864                                     session->smb2_channel.signing_key.data);
5865         }
5866         ZERO_STRUCT(channel_key);
5867
5868         status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
5869                                         session->conn->protocol,
5870                                         recv_iov, 3);
5871         if (!NT_STATUS_IS_OK(status)) {
5872                 return status;
5873         }
5874
5875         return NT_STATUS_OK;
5876 }
5877
5878 NTSTATUS smb2cli_session_encryption_on(struct smbXcli_session *session)
5879 {
5880         if (session->smb2->should_encrypt) {
5881                 return NT_STATUS_OK;
5882         }
5883
5884         if (session->conn->protocol < PROTOCOL_SMB2_24) {
5885                 return NT_STATUS_NOT_SUPPORTED;
5886         }
5887
5888         if (session->conn->smb2.server.cipher == 0) {
5889                 return NT_STATUS_NOT_SUPPORTED;
5890         }
5891
5892         if (session->smb2->signing_key.data == NULL) {
5893                 return NT_STATUS_NOT_SUPPORTED;
5894         }
5895         session->smb2->should_encrypt = true;
5896         return NT_STATUS_OK;
5897 }
5898
5899 struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx)
5900 {
5901         struct smbXcli_tcon *tcon;
5902
5903         tcon = talloc_zero(mem_ctx, struct smbXcli_tcon);
5904         if (tcon == NULL) {
5905                 return NULL;
5906         }
5907
5908         return tcon;
5909 }
5910
5911 void smbXcli_tcon_set_fs_attributes(struct smbXcli_tcon *tcon,
5912                                     uint32_t fs_attributes)
5913 {
5914         tcon->fs_attributes = fs_attributes;
5915 }
5916
5917 uint32_t smbXcli_tcon_get_fs_attributes(struct smbXcli_tcon *tcon)
5918 {
5919         return tcon->fs_attributes;
5920 }
5921
5922 bool smbXcli_tcon_is_dfs_share(struct smbXcli_tcon *tcon)
5923 {
5924         if (tcon == NULL) {
5925                 return false;
5926         }
5927
5928         if (tcon->is_smb1) {
5929                 if (tcon->smb1.optional_support & SMB_SHARE_IN_DFS) {
5930                         return true;
5931                 }
5932
5933                 return false;
5934         }
5935
5936         if (tcon->smb2.capabilities & SMB2_SHARE_CAP_DFS) {
5937                 return true;
5938         }
5939
5940         return false;
5941 }
5942
5943 uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon)
5944 {
5945         return tcon->smb1.tcon_id;
5946 }
5947
5948 void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id)
5949 {
5950         tcon->is_smb1 = true;
5951         tcon->smb1.tcon_id = tcon_id;
5952 }
5953
5954 bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon,
5955                              uint16_t tcon_id,
5956                              uint16_t optional_support,
5957                              uint32_t maximal_access,
5958                              uint32_t guest_maximal_access,
5959                              const char *service,
5960                              const char *fs_type)
5961 {
5962         tcon->is_smb1 = true;
5963         tcon->fs_attributes = 0;
5964         tcon->smb1.tcon_id = tcon_id;
5965         tcon->smb1.optional_support = optional_support;
5966         tcon->smb1.maximal_access = maximal_access;
5967         tcon->smb1.guest_maximal_access = guest_maximal_access;
5968
5969         TALLOC_FREE(tcon->smb1.service);
5970         tcon->smb1.service = talloc_strdup(tcon, service);
5971         if (service != NULL && tcon->smb1.service == NULL) {
5972                 return false;
5973         }
5974
5975         TALLOC_FREE(tcon->smb1.fs_type);
5976         tcon->smb1.fs_type = talloc_strdup(tcon, fs_type);
5977         if (fs_type != NULL && tcon->smb1.fs_type == NULL) {
5978                 return false;
5979         }
5980
5981         return true;
5982 }
5983
5984 uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon)
5985 {
5986         return tcon->smb2.tcon_id;
5987 }
5988
5989 uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon)
5990 {
5991         return tcon->smb2.capabilities;
5992 }
5993
5994 uint32_t smb2cli_tcon_flags(struct smbXcli_tcon *tcon)
5995 {
5996         return tcon->smb2.flags;
5997 }
5998
5999 void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon,
6000                              struct smbXcli_session *session,
6001                              uint32_t tcon_id,
6002                              uint8_t type,
6003                              uint32_t flags,
6004                              uint32_t capabilities,
6005                              uint32_t maximal_access)
6006 {
6007         tcon->is_smb1 = false;
6008         tcon->fs_attributes = 0;
6009         tcon->smb2.tcon_id = tcon_id;
6010         tcon->smb2.type = type;
6011         tcon->smb2.flags = flags;
6012         tcon->smb2.capabilities = capabilities;
6013         tcon->smb2.maximal_access = maximal_access;
6014
6015         tcon->smb2.should_sign = false;
6016         tcon->smb2.should_encrypt = false;
6017
6018         if (session == NULL) {
6019                 return;
6020         }
6021
6022         tcon->smb2.should_sign = session->smb2->should_sign;
6023         tcon->smb2.should_encrypt = session->smb2->should_encrypt;
6024
6025         if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) {
6026                 tcon->smb2.should_encrypt = true;
6027         }
6028 }
6029
6030 void smb2cli_tcon_should_sign(struct smbXcli_tcon *tcon,
6031                               bool should_sign)
6032 {
6033         tcon->smb2.should_sign = should_sign;
6034 }
6035
6036 bool smb2cli_tcon_is_signing_on(struct smbXcli_tcon *tcon)
6037 {
6038         if (tcon->smb2.should_encrypt) {
6039                 return true;
6040         }
6041
6042         return tcon->smb2.should_sign;
6043 }
6044
6045 void smb2cli_tcon_should_encrypt(struct smbXcli_tcon *tcon,
6046                                  bool should_encrypt)
6047 {
6048         tcon->smb2.should_encrypt = should_encrypt;
6049 }
6050
6051 bool smb2cli_tcon_is_encryption_on(struct smbXcli_tcon *tcon)
6052 {
6053         return tcon->smb2.should_encrypt;
6054 }