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 "../libcli/smb/smb_common.h"
  29 #include "../libcli/smb/smb_seal.h"
  30 #include "../libcli/smb/smb_signing.h"
  31 #include "../libcli/smb/read_smb.h"
  32 #include "smbXcli_base.h"
  33 #include "librpc/ndr/libndr.h"
  34 #include "libcli/smb/smb2_negotiate_context.h"
  35 #include <hcrypto/sha.h>
  36
  37 struct smbXcli_conn;
  38 struct smbXcli_req;
  39 struct smbXcli_session;
  40 struct smbXcli_tcon;
  41
  42 struct smbXcli_conn {
  43         int read_fd;
  44         int write_fd;
  45         struct sockaddr_storage local_ss;
  46         struct sockaddr_storage remote_ss;
  47         const char *remote_name;
  48
  49         struct tevent_queue *outgoing;
  50         struct tevent_req **pending;
  51         struct tevent_req *read_smb_req;
  52
  53         enum protocol_types min_protocol;
  54         enum protocol_types max_protocol;
  55         enum protocol_types protocol;
  56         bool allow_signing;
  57         bool desire_signing;
  58         bool mandatory_signing;
  59
  60         /*
  61          * The incoming dispatch function should return:
  62          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
  63          * - NT_STATUS_OK, if no more processing is desired, e.g.
  64          *                 the dispatch function called
  65          *                 tevent_req_done().
  66          * - All other return values disconnect the connection.
  67          */
  68         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
  69                                       TALLOC_CTX *tmp_mem,
  70                                       uint8_t *inbuf);
  71
  72         struct {
  73                 struct {
  74                         uint32_t capabilities;
  75                         uint32_t max_xmit;
  76                 } client;
  77
  78                 struct {
  79                         uint32_t capabilities;
  80                         uint32_t max_xmit;
  81                         uint16_t max_mux;
  82                         uint16_t security_mode;
  83                         bool readbraw;
  84                         bool writebraw;
  85                         bool lockread;
  86                         bool writeunlock;
  87                         uint32_t session_key;
  88                         struct GUID guid;
  89                         DATA_BLOB gss_blob;
  90                         uint8_t challenge[8];
  91                         const char *workgroup;
  92                         const char *name;
  93                         int time_zone;
  94                         NTTIME system_time;
  95                 } server;
  96
  97                 uint32_t capabilities;
  98                 uint32_t max_xmit;
  99
 100                 uint16_t mid;
 101
 102                 struct smb_signing_state *signing;
 103                 struct smb_trans_enc_state *trans_enc;
 104
 105                 struct tevent_req *read_braw_req;
 106         } smb1;
 107
 108         struct {
 109                 struct {
 110                         uint32_t capabilities;
 111                         uint16_t security_mode;
 112                         struct GUID guid;
 113                 } client;
 114
 115                 struct {
 116                         uint32_t capabilities;
 117                         uint16_t security_mode;
 118                         struct GUID guid;
 119                         uint32_t max_trans_size;
 120                         uint32_t max_read_size;
 121                         uint32_t max_write_size;
 122                         NTTIME system_time;
 123                         NTTIME start_time;
 124                         DATA_BLOB gss_blob;
 125                         uint16_t cipher;
 126                 } server;
 127
 128                 uint64_t mid;
 129                 uint16_t cur_credits;
 130                 uint16_t max_credits;
 131
 132                 uint8_t preauth_sha512[64];
 133         } smb2;
 134
 135         struct smbXcli_session *sessions;
 136 };
 137
 138 struct smb2cli_session {
 139         uint64_t session_id;
 140         uint16_t session_flags;
 141         DATA_BLOB application_key;
 142         DATA_BLOB signing_key;
 143         bool should_sign;
 144         bool should_encrypt;
 145         DATA_BLOB encryption_key;
 146         DATA_BLOB decryption_key;
 147         uint64_t nonce_high;
 148         uint64_t nonce_low;
 149         uint16_t channel_sequence;
 150         bool replay_active;
 151 };
 152
 153 struct smbXcli_session {
 154         struct smbXcli_session *prev, *next;
 155         struct smbXcli_conn *conn;
 156
 157         struct {
 158                 uint16_t session_id;
 159                 DATA_BLOB application_key;
 160                 bool protected_key;
 161         } smb1;
 162
 163         struct smb2cli_session *smb2;
 164
 165         struct {
 166                 DATA_BLOB signing_key;
 167                 uint8_t preauth_sha512[64];
 168         } smb2_channel;
 169
 170         /*
 171          * this should be a short term hack
 172          * until the upper layers have implemented
 173          * re-authentication.
 174          */
 175         bool disconnect_expired;
 176 };
 177
 178 struct smbXcli_tcon {
 179         bool is_smb1;
 180         uint32_t fs_attributes;
 181
 182         struct {
 183                 uint16_t tcon_id;
 184                 uint16_t optional_support;
 185                 uint32_t maximal_access;
 186                 uint32_t guest_maximal_access;
 187                 char *service;
 188                 char *fs_type;
 189         } smb1;
 190
 191         struct {
 192                 uint32_t tcon_id;
 193                 uint8_t type;
 194                 uint32_t flags;
 195                 uint32_t capabilities;
 196                 uint32_t maximal_access;
 197                 bool should_sign;
 198                 bool should_encrypt;
 199         } smb2;
 200 };
 201
 202 struct smbXcli_req_state {
 203         struct tevent_context *ev;
 204         struct smbXcli_conn *conn;
 205         struct smbXcli_session *session; /* maybe NULL */
 206         struct smbXcli_tcon *tcon; /* maybe NULL */
 207
 208         uint8_t length_hdr[4];
 209
 210         bool one_way;
 211
 212         uint8_t *inbuf;
 213
 214         struct {
 215                 /* Space for the header including the wct */
 216                 uint8_t hdr[HDR_VWV];
 217
 218                 /*
 219                  * For normal requests, smb1cli_req_send chooses a mid.
 220                  * SecondaryV trans requests need to use the mid of the primary
 221                  * request, so we need a place to store it.
 222                  * Assume it is set if != 0.
 223                  */
 224                 uint16_t mid;
 225
 226                 uint16_t *vwv;
 227                 uint8_t bytecount_buf[2];
 228
 229 #define MAX_SMB_IOV 10
 230                 /* length_hdr, hdr, words, byte_count, buffers */
 231                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 232                 int iov_count;
 233
 234                 bool one_way_seqnum;
 235                 uint32_t seqnum;
 236                 struct tevent_req **chained_requests;
 237
 238                 uint8_t recv_cmd;
 239                 NTSTATUS recv_status;
 240                 /* always an array of 3 talloc elements */
 241                 struct iovec *recv_iov;
 242         } smb1;
 243
 244         struct {
 245                 const uint8_t *fixed;
 246                 uint16_t fixed_len;
 247                 const uint8_t *dyn;
 248                 uint32_t dyn_len;
 249
 250                 uint8_t transform[SMB2_TF_HDR_SIZE];
 251                 uint8_t hdr[SMB2_HDR_BODY];
 252                 uint8_t pad[7]; /* padding space for compounding */
 253
 254                 /*
 255                  * always an array of 3 talloc elements
 256                  * (without a SMB2_TRANSFORM header!)
 257                  *
 258                  * HDR, BODY, DYN
 259                  */
 260                 struct iovec *recv_iov;
 261
 262                 /*
 263                  * the expected max for the response dyn_len
 264                  */
 265                 uint32_t max_dyn_len;
 266
 267                 uint16_t credit_charge;
 268
 269                 bool should_sign;
 270                 bool should_encrypt;
 271                 uint64_t encryption_session_id;
 272
 273                 bool signing_skipped;
 274                 bool notify_async;
 275                 bool got_async;
 276         } smb2;
 277 };
 278
 279 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 280 {
 281         /*
 282          * NT_STATUS_OK, means we do not notify the callers
 283          */
 284         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 285
 286         while (conn->sessions) {
 287                 conn->sessions->conn = NULL;
 288                 DLIST_REMOVE(conn->sessions, conn->sessions);
 289         }
 290
 291         if (conn->smb1.trans_enc) {
 292                 TALLOC_FREE(conn->smb1.trans_enc);
 293         }
 294
 295         return 0;
 296 }
 297
 298 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 299                                          int fd,
 300                                          const char *remote_name,
 301                                          enum smb_signing_setting signing_state,
 302                                          uint32_t smb1_capabilities,
 303                                          struct GUID *client_guid,
 304                                          uint32_t smb2_capabilities)
 305 {
 306         struct smbXcli_conn *conn = NULL;
 307         void *ss = NULL;
 308         struct sockaddr *sa = NULL;
 309         socklen_t sa_length;
 310         int ret;
 311
 312         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 313         if (!conn) {
 314                 return NULL;
 315         }
 316
 317         conn->read_fd = fd;
 318         conn->write_fd = dup(fd);
 319         if (conn->write_fd == -1) {
 320                 goto error;
 321         }
 322
 323         conn->remote_name = talloc_strdup(conn, remote_name);
 324         if (conn->remote_name == NULL) {
 325                 goto error;
 326         }
 327
 328
 329         ss = (void *)&conn->local_ss;
 330         sa = (struct sockaddr *)ss;
 331         sa_length = sizeof(conn->local_ss);
 332         ret = getsockname(fd, sa, &sa_length);
 333         if (ret == -1) {
 334                 goto error;
 335         }
 336         ss = (void *)&conn->remote_ss;
 337         sa = (struct sockaddr *)ss;
 338         sa_length = sizeof(conn->remote_ss);
 339         ret = getpeername(fd, sa, &sa_length);
 340         if (ret == -1) {
 341                 goto error;
 342         }
 343
 344         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 345         if (conn->outgoing == NULL) {
 346                 goto error;
 347         }
 348         conn->pending = NULL;
 349
 350         conn->min_protocol = PROTOCOL_NONE;
 351         conn->max_protocol = PROTOCOL_NONE;
 352         conn->protocol = PROTOCOL_NONE;
 353
 354         switch (signing_state) {
 355         case SMB_SIGNING_OFF:
 356                 /* never */
 357                 conn->allow_signing = false;
 358                 conn->desire_signing = false;
 359                 conn->mandatory_signing = false;
 360                 break;
 361         case SMB_SIGNING_DEFAULT:
 362         case SMB_SIGNING_IF_REQUIRED:
 363                 /* if the server requires it */
 364                 conn->allow_signing = true;
 365                 conn->desire_signing = false;
 366                 conn->mandatory_signing = false;
 367                 break;
 368         case SMB_SIGNING_REQUIRED:
 369                 /* always */
 370                 conn->allow_signing = true;
 371                 conn->desire_signing = true;
 372                 conn->mandatory_signing = true;
 373                 break;
 374         }
 375
 376         conn->smb1.client.capabilities = smb1_capabilities;
 377         conn->smb1.client.max_xmit = UINT16_MAX;
 378
 379         conn->smb1.capabilities = conn->smb1.client.capabilities;
 380         conn->smb1.max_xmit = 1024;
 381
 382         conn->smb1.mid = 1;
 383
 384         /* initialise signing */
 385         conn->smb1.signing = smb_signing_init(conn,
 386                                               conn->allow_signing,
 387                                               conn->desire_signing,
 388                                               conn->mandatory_signing);
 389         if (!conn->smb1.signing) {
 390                 goto error;
 391         }
 392
 393         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 394         if (conn->mandatory_signing) {
 395                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 396         }
 397         if (client_guid) {
 398                 conn->smb2.client.guid = *client_guid;
 399         }
 400         conn->smb2.client.capabilities = smb2_capabilities;
 401
 402         conn->smb2.cur_credits = 1;
 403         conn->smb2.max_credits = 0;
 404
 405         talloc_set_destructor(conn, smbXcli_conn_destructor);
 406         return conn;
 407
 408  error:
 409         if (conn->write_fd != -1) {
 410                 close(conn->write_fd);
 411         }
 412         TALLOC_FREE(conn);
 413         return NULL;
 414 }
 415
 416 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 417 {
 418         if (conn == NULL) {
 419                 return false;
 420         }
 421
 422         if (conn->read_fd == -1) {
 423                 return false;
 424         }
 425
 426         return true;
 427 }
 428
 429 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 430 {
 431         return conn->protocol;
 432 }
 433
 434 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 435 {
 436         if (conn->protocol >= PROTOCOL_SMB2_02) {
 437                 return true;
 438         }
 439
 440         if (conn->smb1.capabilities & CAP_UNICODE) {
 441                 return true;
 442         }
 443
 444         return false;
 445 }
 446
 447 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 448 {
 449         set_socket_options(conn->read_fd, options);
 450 }
 451
 452 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 453 {
 454         return &conn->local_ss;
 455 }
 456
 457 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 458 {
 459         return &conn->remote_ss;
 460 }
 461
 462 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 463 {
 464         return conn->remote_name;
 465 }
 466
 467 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 468 {
 469         if (conn->protocol >= PROTOCOL_SMB2_02) {
 470                 /*
 471                  * TODO...
 472                  */
 473                 return 1;
 474         }
 475
 476         return conn->smb1.server.max_mux;
 477 }
 478
 479 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 480 {
 481         if (conn->protocol >= PROTOCOL_SMB2_02) {
 482                 return conn->smb2.server.system_time;
 483         }
 484
 485         return conn->smb1.server.system_time;
 486 }
 487
 488 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 489 {
 490         if (conn->protocol >= PROTOCOL_SMB2_02) {
 491                 return &conn->smb2.server.gss_blob;
 492         }
 493
 494         return &conn->smb1.server.gss_blob;
 495 }
 496
 497 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 498 {
 499         if (conn->protocol >= PROTOCOL_SMB2_02) {
 500                 return &conn->smb2.server.guid;
 501         }
 502
 503         return &conn->smb1.server.guid;
 504 }
 505
 506 struct smbXcli_conn_samba_suicide_state {
 507         struct smbXcli_conn *conn;
 508         struct iovec iov;
 509         uint8_t buf[9];
 510 };
 511
 512 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq);
 513
 514 struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx,
 515                                                    struct tevent_context *ev,
 516                                                    struct smbXcli_conn *conn,
 517                                                    uint8_t exitcode)
 518 {
 519         struct tevent_req *req, *subreq;
 520         struct smbXcli_conn_samba_suicide_state *state;
 521
 522         req = tevent_req_create(mem_ctx, &state,
 523                                 struct smbXcli_conn_samba_suicide_state);
 524         if (req == NULL) {
 525                 return NULL;
 526         }
 527         state->conn = conn;
 528         SIVAL(state->buf, 4, 0x74697865);
 529         SCVAL(state->buf, 8, exitcode);
 530         _smb_setlen_nbt(state->buf, sizeof(state->buf)-4);
 531
 532         state->iov.iov_base = state->buf;
 533         state->iov.iov_len = sizeof(state->buf);
 534
 535         subreq = writev_send(state, ev, conn->outgoing, conn->write_fd,
 536                              false, &state->iov, 1);
 537         if (tevent_req_nomem(subreq, req)) {
 538                 return tevent_req_post(req, ev);
 539         }
 540         tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req);
 541         return req;
 542 }
 543
 544 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq)
 545 {
 546         struct tevent_req *req = tevent_req_callback_data(
 547                 subreq, struct tevent_req);
 548         struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
 549                 req, struct smbXcli_conn_samba_suicide_state);
 550         ssize_t nwritten;
 551         int err;
 552
 553         nwritten = writev_recv(subreq, &err);
 554         TALLOC_FREE(subreq);
 555         if (nwritten == -1) {
 556                 NTSTATUS status = map_nt_error_from_unix_common(err);
 557                 smbXcli_conn_disconnect(state->conn, status);
 558                 return;
 559         }
 560         tevent_req_done(req);
 561 }
 562
 563 NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req)
 564 {
 565         return tevent_req_simple_recv_ntstatus(req);
 566 }
 567
 568 NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn,
 569                                     uint8_t exitcode)
 570 {
 571         TALLOC_CTX *frame = talloc_stackframe();
 572         struct tevent_context *ev;
 573         struct tevent_req *req;
 574         NTSTATUS status = NT_STATUS_NO_MEMORY;
 575         bool ok;
 576
 577         if (smbXcli_conn_has_async_calls(conn)) {
 578                 /*
 579                  * Can't use sync call while an async call is in flight
 580                  */
 581                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 582                 goto fail;
 583         }
 584         ev = samba_tevent_context_init(frame);
 585         if (ev == NULL) {
 586                 goto fail;
 587         }
 588         req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode);
 589         if (req == NULL) {
 590                 goto fail;
 591         }
 592         ok = tevent_req_poll(req, ev);
 593         if (!ok) {
 594                 status = map_nt_error_from_unix_common(errno);
 595                 goto fail;
 596         }
 597         status = smbXcli_conn_samba_suicide_recv(req);
 598  fail:
 599         TALLOC_FREE(frame);
 600         return status;
 601 }
 602
 603 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 604 {
 605         return conn->smb1.capabilities;
 606 }
 607
 608 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 609 {
 610         return conn->smb1.max_xmit;
 611 }
 612
 613 bool smb1cli_conn_req_possible(struct smbXcli_conn *conn)
 614 {
 615         size_t pending;
 616         uint16_t possible = conn->smb1.server.max_mux;
 617
 618         pending = tevent_queue_length(conn->outgoing);
 619         if (pending >= possible) {
 620                 return false;
 621         }
 622         pending += talloc_array_length(conn->pending);
 623         if (pending >= possible) {
 624                 return false;
 625         }
 626
 627         return true;
 628 }
 629
 630 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 631 {
 632         return conn->smb1.server.session_key;
 633 }
 634
 635 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 636 {
 637         return conn->smb1.server.challenge;
 638 }
 639
 640 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 641 {
 642         return conn->smb1.server.security_mode;
 643 }
 644
 645 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
 646 {
 647         return conn->smb1.server.readbraw;
 648 }
 649
 650 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
 651 {
 652         return conn->smb1.server.writebraw;
 653 }
 654
 655 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
 656 {
 657         return conn->smb1.server.lockread;
 658 }
 659
 660 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
 661 {
 662         return conn->smb1.server.writeunlock;
 663 }
 664
 665 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 666 {
 667         return conn->smb1.server.time_zone;
 668 }
 669
 670 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 671                                    const DATA_BLOB user_session_key,
 672                                    const DATA_BLOB response)
 673 {
 674         return smb_signing_activate(conn->smb1.signing,
 675                                     user_session_key,
 676                                     response);
 677 }
 678
 679 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 680                                 const uint8_t *buf, uint32_t seqnum)
 681 {
 682         const uint8_t *hdr = buf + NBT_HDR_SIZE;
 683         size_t len = smb_len_nbt(buf);
 684
 685         return smb_signing_check_pdu(conn->smb1.signing, hdr, len, seqnum);
 686 }
 687
 688 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 689 {
 690         return smb_signing_is_active(conn->smb1.signing);
 691 }
 692
 693 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 694                                  struct smb_trans_enc_state *es)
 695 {
 696         /* Replace the old state, if any. */
 697         if (conn->smb1.trans_enc) {
 698                 TALLOC_FREE(conn->smb1.trans_enc);
 699         }
 700         conn->smb1.trans_enc = es;
 701 }
 702
 703 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 704 {
 705         return common_encryption_on(conn->smb1.trans_enc);
 706 }
 707
 708
 709 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 710 {
 711         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 712         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 713
 714         if (NT_STATUS_IS_OK(status)) {
 715                 return NT_STATUS_OK;
 716         }
 717
 718         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 719                 return status;
 720         }
 721
 722         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 723 }
 724
 725 /**
 726  * Is the SMB command able to hold an AND_X successor
 727  * @param[in] cmd       The SMB command in question
 728  * @retval Can we add a chained request after "cmd"?
 729  */
 730 bool smb1cli_is_andx_req(uint8_t cmd)
 731 {
 732         switch (cmd) {
 733         case SMBtconX:
 734         case SMBlockingX:
 735         case SMBopenX:
 736         case SMBreadX:
 737         case SMBwriteX:
 738         case SMBsesssetupX:
 739         case SMBulogoffX:
 740         case SMBntcreateX:
 741                 return true;
 742                 break;
 743         default:
 744                 break;
 745         }
 746
 747         return false;
 748 }
 749
 750 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 751 {
 752         size_t num_pending = talloc_array_length(conn->pending);
 753         uint16_t result;
 754
 755         if (conn->protocol == PROTOCOL_NONE) {
 756                 /*
 757                  * This is what windows sends on the SMB1 Negprot request
 758                  * and some vendors reuse the SMB1 MID as SMB2 sequence number.
 759                  */
 760                 return 0;
 761         }
 762
 763         while (true) {
 764                 size_t i;
 765
 766                 result = conn->smb1.mid++;
 767                 if ((result == 0) || (result == 0xffff)) {
 768                         continue;
 769                 }
 770
 771                 for (i=0; i<num_pending; i++) {
 772                         if (result == smb1cli_req_mid(conn->pending[i])) {
 773                                 break;
 774                         }
 775                 }
 776
 777                 if (i == num_pending) {
 778                         return result;
 779                 }
 780         }
 781 }
 782
 783 void smbXcli_req_unset_pending(struct tevent_req *req)
 784 {
 785         struct smbXcli_req_state *state =
 786                 tevent_req_data(req,
 787                 struct smbXcli_req_state);
 788         struct smbXcli_conn *conn = state->conn;
 789         size_t num_pending = talloc_array_length(conn->pending);
 790         size_t i;
 791
 792         if (state->smb1.mid != 0) {
 793                 /*
 794                  * This is a [nt]trans[2] request which waits
 795                  * for more than one reply.
 796                  */
 797                 return;
 798         }
 799
 800         tevent_req_set_cleanup_fn(req, NULL);
 801
 802         if (num_pending == 1) {
 803                 /*
 804                  * The pending read_smb tevent_req is a child of
 805                  * conn->pending. So if nothing is pending anymore, we need to
 806                  * delete the socket read fde.
 807                  */
 808                 TALLOC_FREE(conn->pending);
 809                 conn->read_smb_req = NULL;
 810                 return;
 811         }
 812
 813         for (i=0; i<num_pending; i++) {
 814                 if (req == conn->pending[i]) {
 815                         break;
 816                 }
 817         }
 818         if (i == num_pending) {
 819                 /*
 820                  * Something's seriously broken. Just returning here is the
 821                  * right thing nevertheless, the point of this routine is to
 822                  * remove ourselves from conn->pending.
 823                  */
 824                 return;
 825         }
 826
 827         /*
 828          * Remove ourselves from the conn->pending array
 829          */
 830         for (; i < (num_pending - 1); i++) {
 831                 conn->pending[i] = conn->pending[i+1];
 832         }
 833
 834         /*
 835          * No NULL check here, we're shrinking by sizeof(void *), and
 836          * talloc_realloc just adjusts the size for this.
 837          */
 838         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 839                                        num_pending - 1);
 840         return;
 841 }
 842
 843 static void smbXcli_req_cleanup(struct tevent_req *req,
 844                                 enum tevent_req_state req_state)
 845 {
 846         struct smbXcli_req_state *state =
 847                 tevent_req_data(req,
 848                 struct smbXcli_req_state);
 849
 850         switch (req_state) {
 851         case TEVENT_REQ_RECEIVED:
 852                 /*
 853                  * Make sure we really remove it from
 854                  * the pending array on destruction.
 855                  */
 856                 state->smb1.mid = 0;
 857                 smbXcli_req_unset_pending(req);
 858                 return;
 859         default:
 860                 return;
 861         }
 862 }
 863
 864 static bool smb1cli_req_cancel(struct tevent_req *req);
 865 static bool smb2cli_req_cancel(struct tevent_req *req);
 866
 867 static bool smbXcli_req_cancel(struct tevent_req *req)
 868 {
 869         struct smbXcli_req_state *state =
 870                 tevent_req_data(req,
 871                 struct smbXcli_req_state);
 872
 873         if (!smbXcli_conn_is_connected(state->conn)) {
 874                 return false;
 875         }
 876
 877         if (state->conn->protocol == PROTOCOL_NONE) {
 878                 return false;
 879         }
 880
 881         if (state->conn->protocol >= PROTOCOL_SMB2_02) {
 882                 return smb2cli_req_cancel(req);
 883         }
 884
 885         return smb1cli_req_cancel(req);
 886 }
 887
 888 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 889
 890 bool smbXcli_req_set_pending(struct tevent_req *req)
 891 {
 892         struct smbXcli_req_state *state =
 893                 tevent_req_data(req,
 894                 struct smbXcli_req_state);
 895         struct smbXcli_conn *conn;
 896         struct tevent_req **pending;
 897         size_t num_pending;
 898
 899         conn = state->conn;
 900
 901         if (!smbXcli_conn_is_connected(conn)) {
 902                 return false;
 903         }
 904
 905         num_pending = talloc_array_length(conn->pending);
 906
 907         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 908                                  num_pending+1);
 909         if (pending == NULL) {
 910                 return false;
 911         }
 912         pending[num_pending] = req;
 913         conn->pending = pending;
 914         tevent_req_set_cleanup_fn(req, smbXcli_req_cleanup);
 915         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
 916
 917         if (!smbXcli_conn_receive_next(conn)) {
 918                 /*
 919                  * the caller should notify the current request
 920                  *
 921                  * And all other pending requests get notified
 922                  * by smbXcli_conn_disconnect().
 923                  */
 924                 smbXcli_req_unset_pending(req);
 925                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 926                 return false;
 927         }
 928
 929         return true;
 930 }
 931
 932 static void smbXcli_conn_received(struct tevent_req *subreq);
 933
 934 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 935 {
 936         size_t num_pending = talloc_array_length(conn->pending);
 937         struct tevent_req *req;
 938         struct smbXcli_req_state *state;
 939
 940         if (conn->read_smb_req != NULL) {
 941                 return true;
 942         }
 943
 944         if (num_pending == 0) {
 945                 if (conn->smb2.mid < UINT64_MAX) {
 946                         /* no more pending requests, so we are done for now */
 947                         return true;
 948                 }
 949
 950                 /*
 951                  * If there are no more SMB2 requests possible,
 952                  * because we are out of message ids,
 953                  * we need to disconnect.
 954                  */
 955                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
 956                 return true;
 957         }
 958
 959         req = conn->pending[0];
 960         state = tevent_req_data(req, struct smbXcli_req_state);
 961
 962         /*
 963          * We're the first ones, add the read_smb request that waits for the
 964          * answer from the server
 965          */
 966         conn->read_smb_req = read_smb_send(conn->pending,
 967                                            state->ev,
 968                                            conn->read_fd);
 969         if (conn->read_smb_req == NULL) {
 970                 return false;
 971         }
 972         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
 973         return true;
 974 }
 975
 976 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
 977 {
 978         struct smbXcli_session *session;
 979
 980         tevent_queue_stop(conn->outgoing);
 981
 982         if (conn->read_fd != -1) {
 983                 close(conn->read_fd);
 984         }
 985         if (conn->write_fd != -1) {
 986                 close(conn->write_fd);
 987         }
 988         conn->read_fd = -1;
 989         conn->write_fd = -1;
 990
 991         session = conn->sessions;
 992         if (talloc_array_length(conn->pending) == 0) {
 993                 /*
 994                  * if we do not have pending requests
 995                  * there is no need to update the channel_sequence
 996                  */
 997                 session = NULL;
 998         }
 999         for (; session; session = session->next) {
1000                 smb2cli_session_increment_channel_sequence(session);
1001         }
1002
1003         /*
1004          * Cancel all pending requests. We do not do a for-loop walking
1005          * conn->pending because that array changes in
1006          * smbXcli_req_unset_pending.
1007          */
1008         while (talloc_array_length(conn->pending) > 0) {
1009                 struct tevent_req *req;
1010                 struct smbXcli_req_state *state;
1011                 struct tevent_req **chain;
1012                 size_t num_chained;
1013                 size_t i;
1014
1015                 req = conn->pending[0];
1016                 state = tevent_req_data(req, struct smbXcli_req_state);
1017
1018                 if (state->smb1.chained_requests == NULL) {
1019                         /*
1020                          * We're dead. No point waiting for trans2
1021                          * replies.
1022                          */
1023                         state->smb1.mid = 0;
1024
1025                         smbXcli_req_unset_pending(req);
1026
1027                         if (NT_STATUS_IS_OK(status)) {
1028                                 /* do not notify the callers */
1029                                 continue;
1030                         }
1031
1032                         /*
1033                          * we need to defer the callback, because we may notify
1034                          * more then one caller.
1035                          */
1036                         tevent_req_defer_callback(req, state->ev);
1037                         tevent_req_nterror(req, status);
1038                         continue;
1039                 }
1040
1041                 chain = talloc_move(conn, &state->smb1.chained_requests);
1042                 num_chained = talloc_array_length(chain);
1043
1044                 for (i=0; i<num_chained; i++) {
1045                         req = chain[i];
1046                         state = tevent_req_data(req, struct smbXcli_req_state);
1047
1048                         /*
1049                          * We're dead. No point waiting for trans2
1050                          * replies.
1051                          */
1052                         state->smb1.mid = 0;
1053
1054                         smbXcli_req_unset_pending(req);
1055
1056                         if (NT_STATUS_IS_OK(status)) {
1057                                 /* do not notify the callers */
1058                                 continue;
1059                         }
1060
1061                         /*
1062                          * we need to defer the callback, because we may notify
1063                          * more than one caller.
1064                          */
1065                         tevent_req_defer_callback(req, state->ev);
1066                         tevent_req_nterror(req, status);
1067                 }
1068                 TALLOC_FREE(chain);
1069         }
1070 }
1071
1072 /*
1073  * Fetch a smb request's mid. Only valid after the request has been sent by
1074  * smb1cli_req_send().
1075  */
1076 uint16_t smb1cli_req_mid(struct tevent_req *req)
1077 {
1078         struct smbXcli_req_state *state =
1079                 tevent_req_data(req,
1080                 struct smbXcli_req_state);
1081
1082         if (state->smb1.mid != 0) {
1083                 return state->smb1.mid;
1084         }
1085
1086         return SVAL(state->smb1.hdr, HDR_MID);
1087 }
1088
1089 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
1090 {
1091         struct smbXcli_req_state *state =
1092                 tevent_req_data(req,
1093                 struct smbXcli_req_state);
1094
1095         state->smb1.mid = mid;
1096 }
1097
1098 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
1099 {
1100         struct smbXcli_req_state *state =
1101                 tevent_req_data(req,
1102                 struct smbXcli_req_state);
1103
1104         return state->smb1.seqnum;
1105 }
1106
1107 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
1108 {
1109         struct smbXcli_req_state *state =
1110                 tevent_req_data(req,
1111                 struct smbXcli_req_state);
1112
1113         state->smb1.seqnum = seqnum;
1114 }
1115
1116 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
1117 {
1118         size_t result = 0;
1119         int i;
1120         for (i=0; i<count; i++) {
1121                 result += iov[i].iov_len;
1122         }
1123         return result;
1124 }
1125
1126 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
1127                                    const struct iovec *iov,
1128                                    int count)
1129 {
1130         size_t len = smbXcli_iov_len(iov, count);
1131         size_t copied;
1132         uint8_t *buf;
1133         int i;
1134
1135         buf = talloc_array(mem_ctx, uint8_t, len);
1136         if (buf == NULL) {
1137                 return NULL;
1138         }
1139         copied = 0;
1140         for (i=0; i<count; i++) {
1141                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
1142                 copied += iov[i].iov_len;
1143         }
1144         return buf;
1145 }
1146
1147 static void smb1cli_req_flags(enum protocol_types protocol,
1148                               uint32_t smb1_capabilities,
1149                               uint8_t smb_command,
1150                               uint8_t additional_flags,
1151                               uint8_t clear_flags,
1152                               uint8_t *_flags,
1153                               uint16_t additional_flags2,
1154                               uint16_t clear_flags2,
1155                               uint16_t *_flags2)
1156 {
1157         uint8_t flags = 0;
1158         uint16_t flags2 = 0;
1159
1160         if (protocol >= PROTOCOL_LANMAN1) {
1161                 flags |= FLAG_CASELESS_PATHNAMES;
1162                 flags |= FLAG_CANONICAL_PATHNAMES;
1163         }
1164
1165         if (protocol >= PROTOCOL_LANMAN2) {
1166                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
1167                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
1168         }
1169
1170         if (protocol >= PROTOCOL_NT1) {
1171                 flags2 |= FLAGS2_IS_LONG_NAME;
1172
1173                 if (smb1_capabilities & CAP_UNICODE) {
1174                         flags2 |= FLAGS2_UNICODE_STRINGS;
1175                 }
1176                 if (smb1_capabilities & CAP_STATUS32) {
1177                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
1178                 }
1179                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
1180                         flags2 |= FLAGS2_EXTENDED_SECURITY;
1181                 }
1182         }
1183
1184         flags |= additional_flags;
1185         flags &= ~clear_flags;
1186         flags2 |= additional_flags2;
1187         flags2 &= ~clear_flags2;
1188
1189         *_flags = flags;
1190         *_flags2 = flags2;
1191 }
1192
1193 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
1194
1195 static bool smb1cli_req_cancel(struct tevent_req *req)
1196 {
1197         struct smbXcli_req_state *state =
1198                 tevent_req_data(req,
1199                 struct smbXcli_req_state);
1200         uint8_t flags;
1201         uint16_t flags2;
1202         uint32_t pid;
1203         uint16_t mid;
1204         struct tevent_req *subreq;
1205         NTSTATUS status;
1206
1207         flags = CVAL(state->smb1.hdr, HDR_FLG);
1208         flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
1209         pid  = SVAL(state->smb1.hdr, HDR_PID);
1210         pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
1211         mid = SVAL(state->smb1.hdr, HDR_MID);
1212
1213         subreq = smb1cli_req_create(state, state->ev,
1214                                     state->conn,
1215                                     SMBntcancel,
1216                                     flags, 0,
1217                                     flags2, 0,
1218                                     0, /* timeout */
1219                                     pid,
1220                                     state->tcon,
1221                                     state->session,
1222                                     0, NULL, /* vwv */
1223                                     0, NULL); /* bytes */
1224         if (subreq == NULL) {
1225                 return false;
1226         }
1227         smb1cli_req_set_mid(subreq, mid);
1228
1229         status = smb1cli_req_chain_submit(&subreq, 1);
1230         if (!NT_STATUS_IS_OK(status)) {
1231                 TALLOC_FREE(subreq);
1232                 return false;
1233         }
1234         smb1cli_req_set_mid(subreq, 0);
1235
1236         tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1237
1238         return true;
1239 }
1240
1241 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1242 {
1243         /* we do not care about the result */
1244         TALLOC_FREE(subreq);
1245 }
1246
1247 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1248                                       struct tevent_context *ev,
1249                                       struct smbXcli_conn *conn,
1250                                       uint8_t smb_command,
1251                                       uint8_t additional_flags,
1252                                       uint8_t clear_flags,
1253                                       uint16_t additional_flags2,
1254                                       uint16_t clear_flags2,
1255                                       uint32_t timeout_msec,
1256                                       uint32_t pid,
1257                                       struct smbXcli_tcon *tcon,
1258                                       struct smbXcli_session *session,
1259                                       uint8_t wct, uint16_t *vwv,
1260                                       int iov_count,
1261                                       struct iovec *bytes_iov)
1262 {
1263         struct tevent_req *req;
1264         struct smbXcli_req_state *state;
1265         uint8_t flags = 0;
1266         uint16_t flags2 = 0;
1267         uint16_t uid = 0;
1268         uint16_t tid = 0;
1269
1270         if (iov_count > MAX_SMB_IOV) {
1271                 /*
1272                  * Should not happen :-)
1273                  */
1274                 return NULL;
1275         }
1276
1277         req = tevent_req_create(mem_ctx, &state,
1278                                 struct smbXcli_req_state);
1279         if (req == NULL) {
1280                 return NULL;
1281         }
1282         state->ev = ev;
1283         state->conn = conn;
1284         state->session = session;
1285         state->tcon = tcon;
1286
1287         if (session) {
1288                 uid = session->smb1.session_id;
1289         }
1290
1291         if (tcon) {
1292                 tid = tcon->smb1.tcon_id;
1293
1294                 if (tcon->fs_attributes & FILE_CASE_SENSITIVE_SEARCH) {
1295                         clear_flags |= FLAG_CASELESS_PATHNAMES;
1296                 } else {
1297                         /* Default setting, case insensitive. */
1298                         additional_flags |= FLAG_CASELESS_PATHNAMES;
1299                 }
1300
1301                 if (smbXcli_conn_dfs_supported(conn) &&
1302                     smbXcli_tcon_is_dfs_share(tcon))
1303                 {
1304                         additional_flags2 |= FLAGS2_DFS_PATHNAMES;
1305                 }
1306         }
1307
1308         state->smb1.recv_cmd = 0xFF;
1309         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1310         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1311         if (state->smb1.recv_iov == NULL) {
1312                 TALLOC_FREE(req);
1313                 return NULL;
1314         }
1315
1316         smb1cli_req_flags(conn->protocol,
1317                           conn->smb1.capabilities,
1318                           smb_command,
1319                           additional_flags,
1320                           clear_flags,
1321                           &flags,
1322                           additional_flags2,
1323                           clear_flags2,
1324                           &flags2);
1325
1326         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
1327         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
1328         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
1329         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
1330         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
1331         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1332         SSVAL(state->smb1.hdr, HDR_TID,     tid);
1333         SSVAL(state->smb1.hdr, HDR_PID,     pid);
1334         SSVAL(state->smb1.hdr, HDR_UID,     uid);
1335         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
1336         SCVAL(state->smb1.hdr, HDR_WCT,     wct);
1337
1338         state->smb1.vwv = vwv;
1339
1340         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
1341
1342         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1343         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
1344         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1345         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
1346         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1347         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
1348         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1349         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
1350
1351         if (iov_count != 0) {
1352                 memcpy(&state->smb1.iov[4], bytes_iov,
1353                        iov_count * sizeof(*bytes_iov));
1354         }
1355         state->smb1.iov_count = iov_count + 4;
1356
1357         if (timeout_msec > 0) {
1358                 struct timeval endtime;
1359
1360                 endtime = timeval_current_ofs_msec(timeout_msec);
1361                 if (!tevent_req_set_endtime(req, ev, endtime)) {
1362                         return req;
1363                 }
1364         }
1365
1366         switch (smb_command) {
1367         case SMBtranss:
1368         case SMBtranss2:
1369         case SMBnttranss:
1370                 state->one_way = true;
1371                 break;
1372         case SMBntcancel:
1373                 state->one_way = true;
1374                 state->smb1.one_way_seqnum = true;
1375                 break;
1376         case SMBlockingX:
1377                 if ((wct == 8) &&
1378                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1379                         state->one_way = true;
1380                 }
1381                 break;
1382         }
1383
1384         return req;
1385 }
1386
1387 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1388                                    struct iovec *iov, int iov_count,
1389                                    uint32_t *seqnum,
1390                                    bool one_way_seqnum)
1391 {
1392         TALLOC_CTX *frame = NULL;
1393         uint8_t *buf;
1394
1395         /*
1396          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1397          * iovec directly. MD5Update would do that just fine.
1398          */
1399
1400         if (iov_count < 4) {
1401                 return NT_STATUS_INVALID_PARAMETER_MIX;
1402         }
1403         if (iov[0].iov_len != NBT_HDR_SIZE) {
1404                 return NT_STATUS_INVALID_PARAMETER_MIX;
1405         }
1406         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1407                 return NT_STATUS_INVALID_PARAMETER_MIX;
1408         }
1409         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1410                 return NT_STATUS_INVALID_PARAMETER_MIX;
1411         }
1412         if (iov[3].iov_len != sizeof(uint16_t)) {
1413                 return NT_STATUS_INVALID_PARAMETER_MIX;
1414         }
1415
1416         frame = talloc_stackframe();
1417
1418         buf = smbXcli_iov_concat(frame, &iov[1], iov_count - 1);
1419         if (buf == NULL) {
1420                 return NT_STATUS_NO_MEMORY;
1421         }
1422
1423         *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1424                                           one_way_seqnum);
1425         smb_signing_sign_pdu(conn->smb1.signing,
1426                              buf, talloc_get_size(buf),
1427                              *seqnum);
1428         memcpy(iov[1].iov_base, buf, iov[1].iov_len);
1429
1430         TALLOC_FREE(frame);
1431         return NT_STATUS_OK;
1432 }
1433
1434 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1435 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1436                                                TALLOC_CTX *tmp_mem,
1437                                                uint8_t *inbuf);
1438
1439 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1440                                           struct smbXcli_req_state *state,
1441                                           struct iovec *iov, int iov_count)
1442 {
1443         struct tevent_req *subreq;
1444         NTSTATUS status;
1445         uint8_t cmd;
1446         uint16_t mid;
1447
1448         if (!smbXcli_conn_is_connected(state->conn)) {
1449                 return NT_STATUS_CONNECTION_DISCONNECTED;
1450         }
1451
1452         if (state->conn->protocol > PROTOCOL_NT1) {
1453                 return NT_STATUS_REVISION_MISMATCH;
1454         }
1455
1456         if (iov_count < 4) {
1457                 return NT_STATUS_INVALID_PARAMETER_MIX;
1458         }
1459         if (iov[0].iov_len != NBT_HDR_SIZE) {
1460                 return NT_STATUS_INVALID_PARAMETER_MIX;
1461         }
1462         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1463                 return NT_STATUS_INVALID_PARAMETER_MIX;
1464         }
1465         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1466                 return NT_STATUS_INVALID_PARAMETER_MIX;
1467         }
1468         if (iov[3].iov_len != sizeof(uint16_t)) {
1469                 return NT_STATUS_INVALID_PARAMETER_MIX;
1470         }
1471
1472         cmd = CVAL(iov[1].iov_base, HDR_COM);
1473         if (cmd == SMBreadBraw) {
1474                 if (smbXcli_conn_has_async_calls(state->conn)) {
1475                         return NT_STATUS_INVALID_PARAMETER_MIX;
1476                 }
1477                 state->conn->smb1.read_braw_req = req;
1478         }
1479
1480         if (state->smb1.mid != 0) {
1481                 mid = state->smb1.mid;
1482         } else {
1483                 mid = smb1cli_alloc_mid(state->conn);
1484         }
1485         SSVAL(iov[1].iov_base, HDR_MID, mid);
1486
1487         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1488
1489         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1490                                     &state->smb1.seqnum,
1491                                     state->smb1.one_way_seqnum);
1492
1493         if (!NT_STATUS_IS_OK(status)) {
1494                 return status;
1495         }
1496
1497         /*
1498          * If we supported multiple encrytion contexts
1499          * here we'd look up based on tid.
1500          */
1501         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1502                 char *buf, *enc_buf;
1503
1504                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1505                 if (buf == NULL) {
1506                         return NT_STATUS_NO_MEMORY;
1507                 }
1508                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1509                                                (char *)buf, &enc_buf);
1510                 TALLOC_FREE(buf);
1511                 if (!NT_STATUS_IS_OK(status)) {
1512                         DEBUG(0, ("Error in encrypting client message: %s\n",
1513                                   nt_errstr(status)));
1514                         return status;
1515                 }
1516                 buf = (char *)talloc_memdup(state, enc_buf,
1517                                             smb_len_nbt(enc_buf)+4);
1518                 SAFE_FREE(enc_buf);
1519                 if (buf == NULL) {
1520                         return NT_STATUS_NO_MEMORY;
1521                 }
1522                 iov[0].iov_base = (void *)buf;
1523                 iov[0].iov_len = talloc_get_size(buf);
1524                 iov_count = 1;
1525         }
1526
1527         if (state->conn->dispatch_incoming == NULL) {
1528                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1529         }
1530
1531         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1532
1533         subreq = writev_send(state, state->ev, state->conn->outgoing,
1534                              state->conn->write_fd, false, iov, iov_count);
1535         if (subreq == NULL) {
1536                 return NT_STATUS_NO_MEMORY;
1537         }
1538         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1539         return NT_STATUS_OK;
1540 }
1541
1542 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1543                                     struct tevent_context *ev,
1544                                     struct smbXcli_conn *conn,
1545                                     uint8_t smb_command,
1546                                     uint8_t additional_flags,
1547                                     uint8_t clear_flags,
1548                                     uint16_t additional_flags2,
1549                                     uint16_t clear_flags2,
1550                                     uint32_t timeout_msec,
1551                                     uint32_t pid,
1552                                     struct smbXcli_tcon *tcon,
1553                                     struct smbXcli_session *session,
1554                                     uint8_t wct, uint16_t *vwv,
1555                                     uint32_t num_bytes,
1556                                     const uint8_t *bytes)
1557 {
1558         struct tevent_req *req;
1559         struct iovec iov;
1560         NTSTATUS status;
1561
1562         iov.iov_base = discard_const_p(void, bytes);
1563         iov.iov_len = num_bytes;
1564
1565         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1566                                  additional_flags, clear_flags,
1567                                  additional_flags2, clear_flags2,
1568                                  timeout_msec,
1569                                  pid, tcon, session,
1570                                  wct, vwv, 1, &iov);
1571         if (req == NULL) {
1572                 return NULL;
1573         }
1574         if (!tevent_req_is_in_progress(req)) {
1575                 return tevent_req_post(req, ev);
1576         }
1577         status = smb1cli_req_chain_submit(&req, 1);
1578         if (tevent_req_nterror(req, status)) {
1579                 return tevent_req_post(req, ev);
1580         }
1581         return req;
1582 }
1583
1584 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1585 {
1586         struct tevent_req *req =
1587                 tevent_req_callback_data(subreq,
1588                 struct tevent_req);
1589         struct smbXcli_req_state *state =
1590                 tevent_req_data(req,
1591                 struct smbXcli_req_state);
1592         ssize_t nwritten;
1593         int err;
1594
1595         nwritten = writev_recv(subreq, &err);
1596         TALLOC_FREE(subreq);
1597         if (nwritten == -1) {
1598                 NTSTATUS status = map_nt_error_from_unix_common(err);
1599                 smbXcli_conn_disconnect(state->conn, status);
1600                 return;
1601         }
1602
1603         if (state->one_way) {
1604                 state->inbuf = NULL;
1605                 tevent_req_done(req);
1606                 return;
1607         }
1608
1609         if (!smbXcli_req_set_pending(req)) {
1610                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1611                 return;
1612         }
1613 }
1614
1615 static void smbXcli_conn_received(struct tevent_req *subreq)
1616 {
1617         struct smbXcli_conn *conn =
1618                 tevent_req_callback_data(subreq,
1619                 struct smbXcli_conn);
1620         TALLOC_CTX *frame = talloc_stackframe();
1621         NTSTATUS status;
1622         uint8_t *inbuf;
1623         ssize_t received;
1624         int err;
1625
1626         if (subreq != conn->read_smb_req) {
1627                 DEBUG(1, ("Internal error: cli_smb_received called with "
1628                           "unexpected subreq\n"));
1629                 smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR);
1630                 TALLOC_FREE(frame);
1631                 return;
1632         }
1633         conn->read_smb_req = NULL;
1634
1635         received = read_smb_recv(subreq, frame, &inbuf, &err);
1636         TALLOC_FREE(subreq);
1637         if (received == -1) {
1638                 status = map_nt_error_from_unix_common(err);
1639                 smbXcli_conn_disconnect(conn, status);
1640                 TALLOC_FREE(frame);
1641                 return;
1642         }
1643
1644         status = conn->dispatch_incoming(conn, frame, inbuf);
1645         TALLOC_FREE(frame);
1646         if (NT_STATUS_IS_OK(status)) {
1647                 /*
1648                  * We should not do any more processing
1649                  * as the dispatch function called
1650                  * tevent_req_done().
1651                  */
1652                 return;
1653         }
1654
1655         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1656                 /*
1657                  * We got an error, so notify all pending requests
1658                  */
1659                 smbXcli_conn_disconnect(conn, status);
1660                 return;
1661         }
1662
1663         /*
1664          * We got NT_STATUS_RETRY, so we may ask for a
1665          * next incoming pdu.
1666          */
1667         if (!smbXcli_conn_receive_next(conn)) {
1668                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1669         }
1670 }
1671
1672 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1673                                           struct iovec **piov, int *pnum_iov)
1674 {
1675         struct iovec *iov;
1676         int num_iov;
1677         size_t buflen;
1678         size_t taken;
1679         size_t remaining;
1680         uint8_t *hdr;
1681         uint8_t cmd;
1682         uint32_t wct_ofs;
1683         NTSTATUS status;
1684         size_t min_size = MIN_SMB_SIZE;
1685
1686         buflen = smb_len_tcp(buf);
1687         taken = 0;
1688
1689         hdr = buf + NBT_HDR_SIZE;
1690
1691         status = smb1cli_pull_raw_error(hdr);
1692         if (NT_STATUS_IS_ERR(status)) {
1693                 /*
1694                  * This is an ugly hack to support OS/2
1695                  * which skips the byte_count in the DATA block
1696                  * on some error responses.
1697                  *
1698                  * See bug #9096
1699                  */
1700                 min_size -= sizeof(uint16_t);
1701         }
1702
1703         if (buflen < min_size) {
1704                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1705         }
1706
1707         /*
1708          * This returns iovec elements in the following order:
1709          *
1710          * - SMB header
1711          *
1712          * - Parameter Block
1713          * - Data Block
1714          *
1715          * - Parameter Block
1716          * - Data Block
1717          *
1718          * - Parameter Block
1719          * - Data Block
1720          */
1721         num_iov = 1;
1722
1723         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1724         if (iov == NULL) {
1725                 return NT_STATUS_NO_MEMORY;
1726         }
1727         iov[0].iov_base = hdr;
1728         iov[0].iov_len = HDR_WCT;
1729         taken += HDR_WCT;
1730
1731         cmd = CVAL(hdr, HDR_COM);
1732         wct_ofs = HDR_WCT;
1733
1734         while (true) {
1735                 size_t len = buflen - taken;
1736                 struct iovec *cur;
1737                 struct iovec *iov_tmp;
1738                 uint8_t wct;
1739                 uint32_t bcc_ofs;
1740                 uint16_t bcc;
1741                 size_t needed;
1742
1743                 /*
1744                  * we need at least WCT
1745                  */
1746                 needed = sizeof(uint8_t);
1747                 if (len < needed) {
1748                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1749                                    __location__, (int)len, (int)needed));
1750                         goto inval;
1751                 }
1752
1753                 /*
1754                  * Now we check if the specified words are there
1755                  */
1756                 wct = CVAL(hdr, wct_ofs);
1757                 needed += wct * sizeof(uint16_t);
1758                 if (len < needed) {
1759                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1760                                    __location__, (int)len, (int)needed));
1761                         goto inval;
1762                 }
1763
1764                 if ((num_iov == 1) &&
1765                     (len == needed) &&
1766                     NT_STATUS_IS_ERR(status))
1767                 {
1768                         /*
1769                          * This is an ugly hack to support OS/2
1770                          * which skips the byte_count in the DATA block
1771                          * on some error responses.
1772                          *
1773                          * See bug #9096
1774                          */
1775                         iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1776                                                  num_iov + 2);
1777                         if (iov_tmp == NULL) {
1778                                 TALLOC_FREE(iov);
1779                                 return NT_STATUS_NO_MEMORY;
1780                         }
1781                         iov = iov_tmp;
1782                         cur = &iov[num_iov];
1783                         num_iov += 2;
1784
1785                         cur[0].iov_len = 0;
1786                         cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1787                         cur[1].iov_len = 0;
1788                         cur[1].iov_base = cur[0].iov_base;
1789
1790                         taken += needed;
1791                         break;
1792                 }
1793
1794                 /*
1795                  * we need at least BCC
1796                  */
1797                 needed += sizeof(uint16_t);
1798                 if (len < needed) {
1799                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1800                                    __location__, (int)len, (int)needed));
1801                         goto inval;
1802                 }
1803
1804                 /*
1805                  * Now we check if the specified bytes are there
1806                  */
1807                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1808                 bcc = SVAL(hdr, bcc_ofs);
1809                 needed += bcc * sizeof(uint8_t);
1810                 if (len < needed) {
1811                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1812                                    __location__, (int)len, (int)needed));
1813                         goto inval;
1814                 }
1815
1816                 /*
1817                  * we allocate 2 iovec structures for words and bytes
1818                  */
1819                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1820                                          num_iov + 2);
1821                 if (iov_tmp == NULL) {
1822                         TALLOC_FREE(iov);
1823                         return NT_STATUS_NO_MEMORY;
1824                 }
1825                 iov = iov_tmp;
1826                 cur = &iov[num_iov];
1827                 num_iov += 2;
1828
1829                 cur[0].iov_len = wct * sizeof(uint16_t);
1830                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1831                 cur[1].iov_len = bcc * sizeof(uint8_t);
1832                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1833
1834                 taken += needed;
1835
1836                 if (!smb1cli_is_andx_req(cmd)) {
1837                         /*
1838                          * If the current command does not have AndX chanining
1839                          * we are done.
1840                          */
1841                         break;
1842                 }
1843
1844                 if (wct == 0 && bcc == 0) {
1845                         /*
1846                          * An empty response also ends the chain,
1847                          * most likely with an error.
1848                          */
1849                         break;
1850                 }
1851
1852                 if (wct < 2) {
1853                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1854                                    __location__, (int)wct, (int)cmd));
1855                         goto inval;
1856                 }
1857                 cmd = CVAL(cur[0].iov_base, 0);
1858                 if (cmd == 0xFF) {
1859                         /*
1860                          * If it is the end of the chain we are also done.
1861                          */
1862                         break;
1863                 }
1864                 wct_ofs = SVAL(cur[0].iov_base, 2);
1865
1866                 if (wct_ofs < taken) {
1867                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1868                 }
1869                 if (wct_ofs > buflen) {
1870                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1871                 }
1872
1873                 /*
1874                  * we consumed everything up to the start of the next
1875                  * parameter block.
1876                  */
1877                 taken = wct_ofs;
1878         }
1879
1880         remaining = buflen - taken;
1881
1882         if (remaining > 0 && num_iov >= 3) {
1883                 /*
1884                  * The last DATA block gets the remaining
1885                  * bytes, this is needed to support
1886                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1887                  */
1888                 iov[num_iov-1].iov_len += remaining;
1889         }
1890
1891         *piov = iov;
1892         *pnum_iov = num_iov;
1893         return NT_STATUS_OK;
1894
1895 inval:
1896         TALLOC_FREE(iov);
1897         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1898 }
1899
1900 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1901                                                TALLOC_CTX *tmp_mem,
1902                                                uint8_t *inbuf)
1903 {
1904         struct tevent_req *req;
1905         struct smbXcli_req_state *state;
1906         NTSTATUS status;
1907         size_t num_pending;
1908         size_t i;
1909         uint8_t cmd;
1910         uint16_t mid;
1911         bool oplock_break;
1912         uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1913         size_t len = smb_len_tcp(inbuf);
1914         struct iovec *iov = NULL;
1915         int num_iov = 0;
1916         struct tevent_req **chain = NULL;
1917         size_t num_chained = 0;
1918         size_t num_responses = 0;
1919
1920         if (conn->smb1.read_braw_req != NULL) {
1921                 req = conn->smb1.read_braw_req;
1922                 conn->smb1.read_braw_req = NULL;
1923                 state = tevent_req_data(req, struct smbXcli_req_state);
1924
1925                 smbXcli_req_unset_pending(req);
1926
1927                 if (state->smb1.recv_iov == NULL) {
1928                         /*
1929                          * For requests with more than
1930                          * one response, we have to readd the
1931                          * recv_iov array.
1932                          */
1933                         state->smb1.recv_iov = talloc_zero_array(state,
1934                                                                  struct iovec,
1935                                                                  3);
1936                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1937                                 return NT_STATUS_OK;
1938                         }
1939                 }
1940
1941                 state->smb1.recv_iov[0].iov_base = (void *)(inhdr);
1942                 state->smb1.recv_iov[0].iov_len = len;
1943                 ZERO_STRUCT(state->smb1.recv_iov[1]);
1944                 ZERO_STRUCT(state->smb1.recv_iov[2]);
1945
1946                 state->smb1.recv_cmd = SMBreadBraw;
1947                 state->smb1.recv_status = NT_STATUS_OK;
1948                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1949
1950                 tevent_req_done(req);
1951                 return NT_STATUS_OK;
1952         }
1953
1954         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1955             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1956                 DEBUG(10, ("Got non-SMB PDU\n"));
1957                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1958         }
1959
1960         /*
1961          * If we supported multiple encrytion contexts
1962          * here we'd look up based on tid.
1963          */
1964         if (common_encryption_on(conn->smb1.trans_enc)
1965             && (CVAL(inbuf, 0) == 0)) {
1966                 uint16_t enc_ctx_num;
1967
1968                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1969                 if (!NT_STATUS_IS_OK(status)) {
1970                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1971                                    nt_errstr(status)));
1972                         return status;
1973                 }
1974
1975                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1976                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1977                                    enc_ctx_num,
1978                                    conn->smb1.trans_enc->enc_ctx_num));
1979                         return NT_STATUS_INVALID_HANDLE;
1980                 }
1981
1982                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1983                                                (char *)inbuf);
1984                 if (!NT_STATUS_IS_OK(status)) {
1985                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1986                                    nt_errstr(status)));
1987                         return status;
1988                 }
1989                 inhdr = inbuf + NBT_HDR_SIZE;
1990                 len = smb_len_nbt(inbuf);
1991         }
1992
1993         mid = SVAL(inhdr, HDR_MID);
1994         num_pending = talloc_array_length(conn->pending);
1995
1996         for (i=0; i<num_pending; i++) {
1997                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1998                         break;
1999                 }
2000         }
2001         if (i == num_pending) {
2002                 /* Dump unexpected reply */
2003                 return NT_STATUS_RETRY;
2004         }
2005
2006         oplock_break = false;
2007
2008         if (mid == 0xffff) {
2009                 /*
2010                  * Paranoia checks that this is really an oplock break request.
2011                  */
2012                 oplock_break = (len == 51); /* hdr + 8 words */
2013                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
2014                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
2015                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
2016                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
2017
2018                 if (!oplock_break) {
2019                         /* Dump unexpected reply */
2020                         return NT_STATUS_RETRY;
2021                 }
2022         }
2023
2024         req = conn->pending[i];
2025         state = tevent_req_data(req, struct smbXcli_req_state);
2026
2027         if (!oplock_break /* oplock breaks are not signed */
2028             && !smb_signing_check_pdu(conn->smb1.signing,
2029                                       inhdr, len, state->smb1.seqnum+1)) {
2030                 DEBUG(10, ("cli_check_sign_mac failed\n"));
2031                 return NT_STATUS_ACCESS_DENIED;
2032         }
2033
2034         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
2035                                            &iov, &num_iov);
2036         if (!NT_STATUS_IS_OK(status)) {
2037                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
2038                           nt_errstr(status)));
2039                 return status;
2040         }
2041
2042         cmd = CVAL(inhdr, HDR_COM);
2043         status = smb1cli_pull_raw_error(inhdr);
2044
2045         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
2046             (state->session != NULL) && state->session->disconnect_expired)
2047         {
2048                 /*
2049                  * this should be a short term hack
2050                  * until the upper layers have implemented
2051                  * re-authentication.
2052                  */
2053                 return status;
2054         }
2055
2056         if (state->smb1.chained_requests == NULL) {
2057                 if (num_iov != 3) {
2058                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2059                 }
2060
2061                 smbXcli_req_unset_pending(req);
2062
2063                 if (state->smb1.recv_iov == NULL) {
2064                         /*
2065                          * For requests with more than
2066                          * one response, we have to readd the
2067                          * recv_iov array.
2068                          */
2069                         state->smb1.recv_iov = talloc_zero_array(state,
2070                                                                  struct iovec,
2071                                                                  3);
2072                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2073                                 return NT_STATUS_OK;
2074                         }
2075                 }
2076
2077                 state->smb1.recv_cmd = cmd;
2078                 state->smb1.recv_status = status;
2079                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2080
2081                 state->smb1.recv_iov[0] = iov[0];
2082                 state->smb1.recv_iov[1] = iov[1];
2083                 state->smb1.recv_iov[2] = iov[2];
2084
2085                 if (talloc_array_length(conn->pending) == 0) {
2086                         tevent_req_done(req);
2087                         return NT_STATUS_OK;
2088                 }
2089
2090                 tevent_req_defer_callback(req, state->ev);
2091                 tevent_req_done(req);
2092                 return NT_STATUS_RETRY;
2093         }
2094
2095         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
2096         num_chained = talloc_array_length(chain);
2097         num_responses = (num_iov - 1)/2;
2098
2099         if (num_responses > num_chained) {
2100                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2101         }
2102
2103         for (i=0; i<num_chained; i++) {
2104                 size_t iov_idx = 1 + (i*2);
2105                 struct iovec *cur = &iov[iov_idx];
2106                 uint8_t *inbuf_ref;
2107
2108                 req = chain[i];
2109                 state = tevent_req_data(req, struct smbXcli_req_state);
2110
2111                 smbXcli_req_unset_pending(req);
2112
2113                 /*
2114                  * as we finish multiple requests here
2115                  * we need to defer the callbacks as
2116                  * they could destroy our current stack state.
2117                  */
2118                 tevent_req_defer_callback(req, state->ev);
2119
2120                 if (i >= num_responses) {
2121                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
2122                         continue;
2123                 }
2124
2125                 if (state->smb1.recv_iov == NULL) {
2126                         /*
2127                          * For requests with more than
2128                          * one response, we have to readd the
2129                          * recv_iov array.
2130                          */
2131                         state->smb1.recv_iov = talloc_zero_array(state,
2132                                                                  struct iovec,
2133                                                                  3);
2134                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2135                                 continue;
2136                         }
2137                 }
2138
2139                 state->smb1.recv_cmd = cmd;
2140
2141                 if (i == (num_responses - 1)) {
2142                         /*
2143                          * The last request in the chain gets the status
2144                          */
2145                         state->smb1.recv_status = status;
2146                 } else {
2147                         cmd = CVAL(cur[0].iov_base, 0);
2148                         state->smb1.recv_status = NT_STATUS_OK;
2149                 }
2150
2151                 state->inbuf = inbuf;
2152
2153                 /*
2154                  * Note: here we use talloc_reference() in a way
2155                  *       that does not expose it to the caller.
2156                  */
2157                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
2158                 if (tevent_req_nomem(inbuf_ref, req)) {
2159                         continue;
2160                 }
2161
2162                 /* copy the related buffers */
2163                 state->smb1.recv_iov[0] = iov[0];
2164                 state->smb1.recv_iov[1] = cur[0];
2165                 state->smb1.recv_iov[2] = cur[1];
2166
2167                 tevent_req_done(req);
2168         }
2169
2170         return NT_STATUS_RETRY;
2171 }
2172
2173 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
2174                           TALLOC_CTX *mem_ctx,
2175                           struct iovec **piov,
2176                           uint8_t **phdr,
2177                           uint8_t *pwct,
2178                           uint16_t **pvwv,
2179                           uint32_t *pvwv_offset,
2180                           uint32_t *pnum_bytes,
2181                           uint8_t **pbytes,
2182                           uint32_t *pbytes_offset,
2183                           uint8_t **pinbuf,
2184                           const struct smb1cli_req_expected_response *expected,
2185                           size_t num_expected)
2186 {
2187         struct smbXcli_req_state *state =
2188                 tevent_req_data(req,
2189                 struct smbXcli_req_state);
2190         NTSTATUS status = NT_STATUS_OK;
2191         struct iovec *recv_iov = NULL;
2192         uint8_t *hdr = NULL;
2193         uint8_t wct = 0;
2194         uint32_t vwv_offset = 0;
2195         uint16_t *vwv = NULL;
2196         uint32_t num_bytes = 0;
2197         uint32_t bytes_offset = 0;
2198         uint8_t *bytes = NULL;
2199         size_t i;
2200         bool found_status = false;
2201         bool found_size = false;
2202
2203         if (piov != NULL) {
2204                 *piov = NULL;
2205         }
2206         if (phdr != NULL) {
2207                 *phdr = 0;
2208         }
2209         if (pwct != NULL) {
2210                 *pwct = 0;
2211         }
2212         if (pvwv != NULL) {
2213                 *pvwv = NULL;
2214         }
2215         if (pvwv_offset != NULL) {
2216                 *pvwv_offset = 0;
2217         }
2218         if (pnum_bytes != NULL) {
2219                 *pnum_bytes = 0;
2220         }
2221         if (pbytes != NULL) {
2222                 *pbytes = NULL;
2223         }
2224         if (pbytes_offset != NULL) {
2225                 *pbytes_offset = 0;
2226         }
2227         if (pinbuf != NULL) {
2228                 *pinbuf = NULL;
2229         }
2230
2231         if (state->inbuf != NULL) {
2232                 recv_iov = state->smb1.recv_iov;
2233                 state->smb1.recv_iov = NULL;
2234                 if (state->smb1.recv_cmd != SMBreadBraw) {
2235                         hdr = (uint8_t *)recv_iov[0].iov_base;
2236                         wct = recv_iov[1].iov_len/2;
2237                         vwv = (uint16_t *)recv_iov[1].iov_base;
2238                         vwv_offset = PTR_DIFF(vwv, hdr);
2239                         num_bytes = recv_iov[2].iov_len;
2240                         bytes = (uint8_t *)recv_iov[2].iov_base;
2241                         bytes_offset = PTR_DIFF(bytes, hdr);
2242                 }
2243         }
2244
2245         if (tevent_req_is_nterror(req, &status)) {
2246                 for (i=0; i < num_expected; i++) {
2247                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2248                                 found_status = true;
2249                                 break;
2250                         }
2251                 }
2252
2253                 if (found_status) {
2254                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2255                 }
2256
2257                 return status;
2258         }
2259
2260         if (num_expected == 0) {
2261                 found_status = true;
2262                 found_size = true;
2263         }
2264
2265         status = state->smb1.recv_status;
2266
2267         for (i=0; i < num_expected; i++) {
2268                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2269                         continue;
2270                 }
2271
2272                 found_status = true;
2273                 if (expected[i].wct == 0) {
2274                         found_size = true;
2275                         break;
2276                 }
2277
2278                 if (expected[i].wct == wct) {
2279                         found_size = true;
2280                         break;
2281                 }
2282         }
2283
2284         if (!found_status) {
2285                 return status;
2286         }
2287
2288         if (!found_size) {
2289                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2290         }
2291
2292         if (piov != NULL) {
2293                 *piov = talloc_move(mem_ctx, &recv_iov);
2294         }
2295
2296         if (phdr != NULL) {
2297                 *phdr = hdr;
2298         }
2299         if (pwct != NULL) {
2300                 *pwct = wct;
2301         }
2302         if (pvwv != NULL) {
2303                 *pvwv = vwv;
2304         }
2305         if (pvwv_offset != NULL) {
2306                 *pvwv_offset = vwv_offset;
2307         }
2308         if (pnum_bytes != NULL) {
2309                 *pnum_bytes = num_bytes;
2310         }
2311         if (pbytes != NULL) {
2312                 *pbytes = bytes;
2313         }
2314         if (pbytes_offset != NULL) {
2315                 *pbytes_offset = bytes_offset;
2316         }
2317         if (pinbuf != NULL) {
2318                 *pinbuf = state->inbuf;
2319         }
2320
2321         return status;
2322 }
2323
2324 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2325 {
2326         size_t wct_ofs;
2327         int i;
2328
2329         wct_ofs = HDR_WCT;
2330
2331         for (i=0; i<num_reqs; i++) {
2332                 struct smbXcli_req_state *state;
2333                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2334                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2335                                            state->smb1.iov_count-2);
2336                 wct_ofs = (wct_ofs + 3) & ~3;
2337         }
2338         return wct_ofs;
2339 }
2340
2341 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2342 {
2343         struct smbXcli_req_state *first_state =
2344                 tevent_req_data(reqs[0],
2345                 struct smbXcli_req_state);
2346         struct smbXcli_req_state *state;
2347         size_t wct_offset;
2348         size_t chain_padding = 0;
2349         int i, iovlen;
2350         struct iovec *iov = NULL;
2351         struct iovec *this_iov;
2352         NTSTATUS status;
2353         size_t nbt_len;
2354
2355         if (num_reqs == 1) {
2356                 return smb1cli_req_writev_submit(reqs[0], first_state,
2357                                                  first_state->smb1.iov,
2358                                                  first_state->smb1.iov_count);
2359         }
2360
2361         iovlen = 0;
2362         for (i=0; i<num_reqs; i++) {
2363                 if (!tevent_req_is_in_progress(reqs[i])) {
2364                         return NT_STATUS_INTERNAL_ERROR;
2365                 }
2366
2367                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2368
2369                 if (state->smb1.iov_count < 4) {
2370                         return NT_STATUS_INVALID_PARAMETER_MIX;
2371                 }
2372
2373                 if (i == 0) {
2374                         /*
2375                          * The NBT and SMB header
2376                          */
2377                         iovlen += 2;
2378                 } else {
2379                         /*
2380                          * Chain padding
2381                          */
2382                         iovlen += 1;
2383                 }
2384
2385                 /*
2386                  * words and bytes
2387                  */
2388                 iovlen += state->smb1.iov_count - 2;
2389         }
2390
2391         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2392         if (iov == NULL) {
2393                 return NT_STATUS_NO_MEMORY;
2394         }
2395
2396         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2397                 first_state, reqs, sizeof(*reqs) * num_reqs);
2398         if (first_state->smb1.chained_requests == NULL) {
2399                 TALLOC_FREE(iov);
2400                 return NT_STATUS_NO_MEMORY;
2401         }
2402
2403         wct_offset = HDR_WCT;
2404         this_iov = iov;
2405
2406         for (i=0; i<num_reqs; i++) {
2407                 size_t next_padding = 0;
2408                 uint16_t *vwv;
2409
2410                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2411
2412                 if (i < num_reqs-1) {
2413                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2414                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2415                                 TALLOC_FREE(iov);
2416                                 TALLOC_FREE(first_state->smb1.chained_requests);
2417                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2418                         }
2419                 }
2420
2421                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2422                                               state->smb1.iov_count-2) + 1;
2423                 if ((wct_offset % 4) != 0) {
2424                         next_padding = 4 - (wct_offset % 4);
2425                 }
2426                 wct_offset += next_padding;
2427                 vwv = state->smb1.vwv;
2428
2429                 if (i < num_reqs-1) {
2430                         struct smbXcli_req_state *next_state =
2431                                 tevent_req_data(reqs[i+1],
2432                                 struct smbXcli_req_state);
2433                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2434                         SCVAL(vwv+0, 1, 0);
2435                         SSVAL(vwv+1, 0, wct_offset);
2436                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2437                         /* properly end the chain */
2438                         SCVAL(vwv+0, 0, 0xff);
2439                         SCVAL(vwv+0, 1, 0xff);
2440                         SSVAL(vwv+1, 0, 0);
2441                 }
2442
2443                 if (i == 0) {
2444                         /*
2445                          * The NBT and SMB header
2446                          */
2447                         this_iov[0] = state->smb1.iov[0];
2448                         this_iov[1] = state->smb1.iov[1];
2449                         this_iov += 2;
2450                 } else {
2451                         /*
2452                          * This one is a bit subtle. We have to add
2453                          * chain_padding bytes between the requests, and we
2454                          * have to also include the wct field of the
2455                          * subsequent requests. We use the subsequent header
2456                          * for the padding, it contains the wct field in its
2457                          * last byte.
2458                          */
2459                         this_iov[0].iov_len = chain_padding+1;
2460                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2461                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2462                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2463                         this_iov += 1;
2464                 }
2465
2466                 /*
2467                  * copy the words and bytes
2468                  */
2469                 memcpy(this_iov, state->smb1.iov+2,
2470                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2471                 this_iov += state->smb1.iov_count - 2;
2472                 chain_padding = next_padding;
2473         }
2474
2475         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
2476         if (nbt_len > first_state->conn->smb1.max_xmit) {
2477                 TALLOC_FREE(iov);
2478                 TALLOC_FREE(first_state->smb1.chained_requests);
2479                 return NT_STATUS_INVALID_PARAMETER_MIX;
2480         }
2481
2482         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2483         if (!NT_STATUS_IS_OK(status)) {
2484                 TALLOC_FREE(iov);
2485                 TALLOC_FREE(first_state->smb1.chained_requests);
2486                 return status;
2487         }
2488
2489         return NT_STATUS_OK;
2490 }
2491
2492 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2493 {
2494         return ((tevent_queue_length(conn->outgoing) != 0)
2495                 || (talloc_array_length(conn->pending) != 0));
2496 }
2497
2498 bool smbXcli_conn_dfs_supported(struct smbXcli_conn *conn)
2499 {
2500         if (conn->protocol >= PROTOCOL_SMB2_02) {
2501                 return (smb2cli_conn_server_capabilities(conn) & SMB2_CAP_DFS);
2502         }
2503
2504         return (smb1cli_conn_capabilities(conn) & CAP_DFS);
2505 }
2506
2507 bool smb2cli_conn_req_possible(struct smbXcli_conn *conn, uint32_t *max_dyn_len)
2508 {
2509         uint16_t credits = 1;
2510
2511         if (conn->smb2.cur_credits == 0) {
2512                 if (max_dyn_len != NULL) {
2513                         *max_dyn_len = 0;
2514                 }
2515                 return false;
2516         }
2517
2518         if (conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2519                 credits = conn->smb2.cur_credits;
2520         }
2521
2522         if (max_dyn_len != NULL) {
2523                 *max_dyn_len = credits * 65536;
2524         }
2525
2526         return true;
2527 }
2528
2529 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2530 {
2531         return conn->smb2.server.capabilities;
2532 }
2533
2534 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2535 {
2536         return conn->smb2.server.security_mode;
2537 }
2538
2539 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2540 {
2541         return conn->smb2.server.max_trans_size;
2542 }
2543
2544 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2545 {
2546         return conn->smb2.server.max_read_size;
2547 }
2548
2549 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2550 {
2551         return conn->smb2.server.max_write_size;
2552 }
2553
2554 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2555                                   uint16_t max_credits)
2556 {
2557         conn->smb2.max_credits = max_credits;
2558 }
2559
2560 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2561
2562 static bool smb2cli_req_cancel(struct tevent_req *req)
2563 {
2564         struct smbXcli_req_state *state =
2565                 tevent_req_data(req,
2566                 struct smbXcli_req_state);
2567         uint32_t flags = IVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2568         uint64_t mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID);
2569         uint64_t aid = BVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID);
2570         struct smbXcli_tcon *tcon = state->tcon;
2571         struct smbXcli_session *session = state->session;
2572         uint8_t *fixed = state->smb2.pad;
2573         uint16_t fixed_len = 4;
2574         struct tevent_req *subreq;
2575         struct smbXcli_req_state *substate;
2576         NTSTATUS status;
2577
2578         SSVAL(fixed, 0, 0x04);
2579         SSVAL(fixed, 2, 0);
2580
2581         subreq = smb2cli_req_create(state, state->ev,
2582                                     state->conn,
2583                                     SMB2_OP_CANCEL,
2584                                     flags, 0,
2585                                     0, /* timeout */
2586                                     tcon, session,
2587                                     fixed, fixed_len,
2588                                     NULL, 0, 0);
2589         if (subreq == NULL) {
2590                 return false;
2591         }
2592         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2593
2594         /*
2595          * clear everything but the SMB2_HDR_FLAG_ASYNC flag
2596          * e.g. if SMB2_HDR_FLAG_CHAINED is set we get INVALID_PARAMETER back
2597          */
2598         flags &= SMB2_HDR_FLAG_ASYNC;
2599
2600         if (flags & SMB2_HDR_FLAG_ASYNC) {
2601                 mid = 0;
2602         }
2603
2604         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, flags);
2605         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2606         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, aid);
2607
2608         status = smb2cli_req_compound_submit(&subreq, 1);
2609         if (!NT_STATUS_IS_OK(status)) {
2610                 TALLOC_FREE(subreq);
2611                 return false;
2612         }
2613
2614         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2615
2616         return true;
2617 }
2618
2619 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2620 {
2621         /* we do not care about the result */
2622         TALLOC_FREE(subreq);
2623 }
2624
2625 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2626                                       struct tevent_context *ev,
2627                                       struct smbXcli_conn *conn,
2628                                       uint16_t cmd,
2629                                       uint32_t additional_flags,
2630                                       uint32_t clear_flags,
2631                                       uint32_t timeout_msec,
2632                                       struct smbXcli_tcon *tcon,
2633                                       struct smbXcli_session *session,
2634                                       const uint8_t *fixed,
2635                                       uint16_t fixed_len,
2636                                       const uint8_t *dyn,
2637                                       uint32_t dyn_len,
2638                                       uint32_t max_dyn_len)
2639 {
2640         struct tevent_req *req;
2641         struct smbXcli_req_state *state;
2642         uint32_t flags = 0;
2643         uint32_t tid = 0;
2644         uint64_t uid = 0;
2645         bool use_channel_sequence = false;
2646         uint16_t channel_sequence = 0;
2647         bool use_replay_flag = false;
2648
2649         req = tevent_req_create(mem_ctx, &state,
2650                                 struct smbXcli_req_state);
2651         if (req == NULL) {
2652                 return NULL;
2653         }
2654
2655         state->ev = ev;
2656         state->conn = conn;
2657         state->session = session;
2658         state->tcon = tcon;
2659
2660         if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) {
2661                 use_channel_sequence = true;
2662         } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) {
2663                 use_channel_sequence = true;
2664         }
2665
2666         if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_00) {
2667                 use_replay_flag = true;
2668         }
2669
2670         if (session) {
2671                 uid = session->smb2->session_id;
2672
2673                 if (use_channel_sequence) {
2674                         channel_sequence = session->smb2->channel_sequence;
2675                 }
2676
2677                 if (use_replay_flag && session->smb2->replay_active) {
2678                         additional_flags |= SMB2_HDR_FLAG_REPLAY_OPERATION;
2679                 }
2680
2681                 state->smb2.should_sign = session->smb2->should_sign;
2682                 state->smb2.should_encrypt = session->smb2->should_encrypt;
2683
2684                 if (cmd == SMB2_OP_SESSSETUP &&
2685                     session->smb2->signing_key.length != 0) {
2686                         state->smb2.should_sign = true;
2687                 }
2688
2689                 if (cmd == SMB2_OP_SESSSETUP &&
2690                     session->smb2_channel.signing_key.length == 0) {
2691                         state->smb2.should_encrypt = false;
2692                 }
2693
2694                 if (additional_flags & SMB2_HDR_FLAG_SIGNED) {
2695                         if (session->smb2_channel.signing_key.length == 0) {
2696                                 tevent_req_nterror(req, NT_STATUS_NO_USER_SESSION_KEY);
2697                                 return req;
2698                         }
2699
2700                         additional_flags &= ~SMB2_HDR_FLAG_SIGNED;
2701                         state->smb2.should_sign = true;
2702                 }
2703         }
2704
2705         if (tcon) {
2706                 tid = tcon->smb2.tcon_id;
2707
2708                 if (tcon->smb2.should_sign) {
2709                         state->smb2.should_sign = true;
2710                 }
2711                 if (tcon->smb2.should_encrypt) {
2712                         state->smb2.should_encrypt = true;
2713                 }
2714         }
2715
2716         if (state->smb2.should_encrypt) {
2717                 state->smb2.should_sign = false;
2718         }
2719
2720         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2721         if (state->smb2.recv_iov == NULL) {
2722                 TALLOC_FREE(req);
2723                 return NULL;
2724         }
2725
2726         flags |= additional_flags;
2727         flags &= ~clear_flags;
2728
2729         state->smb2.fixed = fixed;
2730         state->smb2.fixed_len = fixed_len;
2731         state->smb2.dyn = dyn;
2732         state->smb2.dyn_len = dyn_len;
2733         state->smb2.max_dyn_len = max_dyn_len;
2734
2735         if (state->smb2.should_encrypt) {
2736                 SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2737                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid);
2738         }
2739
2740         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2741         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2742         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2743         SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence);
2744         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2745         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            0); /* reserved */
2746         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2747         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2748
2749         switch (cmd) {
2750         case SMB2_OP_CANCEL:
2751                 state->one_way = true;
2752                 break;
2753         case SMB2_OP_BREAK:
2754                 /*
2755                  * If this is a dummy request, it will have
2756                  * UINT64_MAX as message id.
2757                  * If we send on break acknowledgement,
2758                  * this gets overwritten later.
2759                  */
2760                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2761                 break;
2762         }
2763
2764         if (timeout_msec > 0) {
2765                 struct timeval endtime;
2766
2767                 endtime = timeval_current_ofs_msec(timeout_msec);
2768                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2769                         return req;
2770                 }
2771         }
2772
2773         return req;
2774 }
2775
2776 void smb2cli_req_set_notify_async(struct tevent_req *req)
2777 {
2778         struct smbXcli_req_state *state =
2779                 tevent_req_data(req,
2780                 struct smbXcli_req_state);
2781
2782         state->smb2.notify_async = true;
2783 }
2784
2785 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2786 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2787                                                TALLOC_CTX *tmp_mem,
2788                                                uint8_t *inbuf);
2789
2790 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2791                                      int num_reqs)
2792 {
2793         struct smbXcli_req_state *state;
2794         struct tevent_req *subreq;
2795         struct iovec *iov;
2796         int i, num_iov, nbt_len;
2797         int tf_iov = -1;
2798         const DATA_BLOB *encryption_key = NULL;
2799         uint64_t encryption_session_id = 0;
2800
2801         /*
2802          * 1 for the nbt length, optional TRANSFORM
2803          * per request: HDR, fixed, dyn, padding
2804          * -1 because the last one does not need padding
2805          */
2806
2807         iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1);
2808         if (iov == NULL) {
2809                 return NT_STATUS_NO_MEMORY;
2810         }
2811
2812         num_iov = 1;
2813         nbt_len = 0;
2814
2815         /*
2816          * the session of the first request that requires encryption
2817          * specifies the encryption key.
2818          */
2819         for (i=0; i<num_reqs; i++) {
2820                 if (!tevent_req_is_in_progress(reqs[i])) {
2821                         return NT_STATUS_INTERNAL_ERROR;
2822                 }
2823
2824                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2825
2826                 if (!smbXcli_conn_is_connected(state->conn)) {
2827                         return NT_STATUS_CONNECTION_DISCONNECTED;
2828                 }
2829
2830                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2831                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2832                         return NT_STATUS_REVISION_MISMATCH;
2833                 }
2834
2835                 if (state->session == NULL) {
2836                         continue;
2837                 }
2838
2839                 if (!state->smb2.should_encrypt) {
2840                         continue;
2841                 }
2842
2843                 encryption_key = &state->session->smb2->encryption_key;
2844                 if (encryption_key->length == 0) {
2845                         return NT_STATUS_INVALID_PARAMETER_MIX;
2846                 }
2847
2848                 encryption_session_id = state->session->smb2->session_id;
2849
2850                 tf_iov = num_iov;
2851                 iov[num_iov].iov_base = state->smb2.transform;
2852                 iov[num_iov].iov_len  = sizeof(state->smb2.transform);
2853                 num_iov += 1;
2854
2855                 SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2856                 SBVAL(state->smb2.transform, SMB2_TF_NONCE,
2857                       state->session->smb2->nonce_low);
2858                 SBVAL(state->smb2.transform, SMB2_TF_NONCE+8,
2859                       state->session->smb2->nonce_high);
2860                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID,
2861                       encryption_session_id);
2862
2863                 state->session->smb2->nonce_low += 1;
2864                 if (state->session->smb2->nonce_low == 0) {
2865                         state->session->smb2->nonce_high += 1;
2866                         state->session->smb2->nonce_low += 1;
2867                 }
2868
2869                 nbt_len += SMB2_TF_HDR_SIZE;
2870                 break;
2871         }
2872
2873         for (i=0; i<num_reqs; i++) {
2874                 int hdr_iov;
2875                 size_t reqlen;
2876                 bool ret;
2877                 uint16_t opcode;
2878                 uint64_t avail;
2879                 uint16_t charge;
2880                 uint16_t credits;
2881                 uint64_t mid;
2882                 const DATA_BLOB *signing_key = NULL;
2883
2884                 if (!tevent_req_is_in_progress(reqs[i])) {
2885                         return NT_STATUS_INTERNAL_ERROR;
2886                 }
2887
2888                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2889
2890                 if (!smbXcli_conn_is_connected(state->conn)) {
2891                         return NT_STATUS_CONNECTION_DISCONNECTED;
2892                 }
2893
2894                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2895                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2896                         return NT_STATUS_REVISION_MISMATCH;
2897                 }
2898
2899                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2900                 if (opcode == SMB2_OP_CANCEL) {
2901                         goto skip_credits;
2902                 }
2903
2904                 avail = UINT64_MAX - state->conn->smb2.mid;
2905                 if (avail < 1) {
2906                         return NT_STATUS_CONNECTION_ABORTED;
2907                 }
2908
2909                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2910                         uint32_t max_dyn_len = 1;
2911
2912                         max_dyn_len = MAX(max_dyn_len, state->smb2.dyn_len);
2913                         max_dyn_len = MAX(max_dyn_len, state->smb2.max_dyn_len);
2914
2915                         charge = (max_dyn_len - 1)/ 65536 + 1;
2916                 } else {
2917                         charge = 1;
2918                 }
2919
2920                 charge = MAX(state->smb2.credit_charge, charge);
2921
2922                 avail = MIN(avail, state->conn->smb2.cur_credits);
2923                 if (avail < charge) {
2924                         return NT_STATUS_INTERNAL_ERROR;
2925                 }
2926
2927                 credits = 0;
2928                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2929                         credits = state->conn->smb2.max_credits -
2930                                   state->conn->smb2.cur_credits;
2931                 }
2932                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2933                         credits += 1;
2934                 }
2935
2936                 mid = state->conn->smb2.mid;
2937                 state->conn->smb2.mid += charge;
2938                 state->conn->smb2.cur_credits -= charge;
2939
2940                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2941                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2942                 }
2943                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2944                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2945
2946 skip_credits:
2947                 if (state->session && encryption_key == NULL) {
2948                         /*
2949                          * We prefer the channel signing key if it is
2950                          * already there.
2951                          */
2952                         if (state->smb2.should_sign) {
2953                                 signing_key = &state->session->smb2_channel.signing_key;
2954                         }
2955
2956                         /*
2957                          * If it is a channel binding, we already have the main
2958                          * signing key and try that one.
2959                          */
2960                         if (signing_key && signing_key->length == 0) {
2961                                 signing_key = &state->session->smb2->signing_key;
2962                         }
2963
2964                         /*
2965                          * If we do not have any session key yet, we skip the
2966                          * signing of SMB2_OP_SESSSETUP requests.
2967                          */
2968                         if (signing_key && signing_key->length == 0) {
2969                                 signing_key = NULL;
2970                         }
2971                 }
2972
2973                 hdr_iov = num_iov;
2974                 iov[num_iov].iov_base = state->smb2.hdr;
2975                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2976                 num_iov += 1;
2977
2978                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2979                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2980                 num_iov += 1;
2981
2982                 if (state->smb2.dyn != NULL) {
2983                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2984                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2985                         num_iov += 1;
2986                 }
2987
2988                 reqlen  = sizeof(state->smb2.hdr);
2989                 reqlen += state->smb2.fixed_len;
2990                 reqlen += state->smb2.dyn_len;
2991
2992                 if (i < num_reqs-1) {
2993                         if ((reqlen % 8) > 0) {
2994                                 uint8_t pad = 8 - (reqlen % 8);
2995                                 iov[num_iov].iov_base = state->smb2.pad;
2996                                 iov[num_iov].iov_len = pad;
2997                                 num_iov += 1;
2998                                 reqlen += pad;
2999                         }
3000                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
3001                 }
3002
3003                 state->smb2.encryption_session_id = encryption_session_id;
3004
3005                 if (signing_key != NULL) {
3006                         NTSTATUS status;
3007
3008                         status = smb2_signing_sign_pdu(*signing_key,
3009                                                        state->session->conn->protocol,
3010                                                        &iov[hdr_iov], num_iov - hdr_iov);
3011                         if (!NT_STATUS_IS_OK(status)) {
3012                                 return status;
3013                         }
3014                 }
3015
3016                 nbt_len += reqlen;
3017
3018                 ret = smbXcli_req_set_pending(reqs[i]);
3019                 if (!ret) {
3020                         return NT_STATUS_NO_MEMORY;
3021                 }
3022         }
3023
3024         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
3025         _smb_setlen_tcp(state->length_hdr, nbt_len);
3026         iov[0].iov_base = state->length_hdr;
3027         iov[0].iov_len  = sizeof(state->length_hdr);
3028
3029         if (encryption_key != NULL) {
3030                 NTSTATUS status;
3031                 size_t buflen = nbt_len - SMB2_TF_HDR_SIZE;
3032                 uint8_t *buf;
3033                 int vi;
3034
3035                 buf = talloc_array(iov, uint8_t, buflen);
3036                 if (buf == NULL) {
3037                         return NT_STATUS_NO_MEMORY;
3038                 }
3039
3040                 /*
3041                  * We copy the buffers before encrypting them,
3042                  * this is at least currently needed for the
3043                  * to keep state->smb2.hdr.
3044                  *
3045                  * Also the callers may expect there buffers
3046                  * to be const.
3047                  */
3048                 for (vi = tf_iov + 1; vi < num_iov; vi++) {
3049                         struct iovec *v = &iov[vi];
3050                         const uint8_t *o = (const uint8_t *)v->iov_base;
3051
3052                         memcpy(buf, o, v->iov_len);
3053                         v->iov_base = (void *)buf;
3054                         buf += v->iov_len;
3055                 }
3056
3057                 status = smb2_signing_encrypt_pdu(*encryption_key,
3058                                         state->conn->protocol,
3059                                         &iov[tf_iov], num_iov - tf_iov);
3060                 if (!NT_STATUS_IS_OK(status)) {
3061                         return status;
3062                 }
3063         }
3064
3065         if (state->conn->dispatch_incoming == NULL) {
3066                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3067         }
3068
3069         subreq = writev_send(state, state->ev, state->conn->outgoing,
3070                              state->conn->write_fd, false, iov, num_iov);
3071         if (subreq == NULL) {
3072                 return NT_STATUS_NO_MEMORY;
3073         }
3074         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
3075         return NT_STATUS_OK;
3076 }
3077
3078 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
3079 {
3080         struct smbXcli_req_state *state =
3081                 tevent_req_data(req,
3082                 struct smbXcli_req_state);
3083
3084         state->smb2.credit_charge = charge;
3085 }
3086
3087 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
3088                                     struct tevent_context *ev,
3089                                     struct smbXcli_conn *conn,
3090                                     uint16_t cmd,
3091                                     uint32_t additional_flags,
3092                                     uint32_t clear_flags,
3093                                     uint32_t timeout_msec,
3094                                     struct smbXcli_tcon *tcon,
3095                                     struct smbXcli_session *session,
3096                                     const uint8_t *fixed,
3097                                     uint16_t fixed_len,
3098                                     const uint8_t *dyn,
3099                                     uint32_t dyn_len,
3100                                     uint32_t max_dyn_len)
3101 {
3102         struct tevent_req *req;
3103         NTSTATUS status;
3104
3105         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
3106                                  additional_flags, clear_flags,
3107                                  timeout_msec,
3108                                  tcon, session,
3109                                  fixed, fixed_len,
3110                                  dyn, dyn_len,
3111                                  max_dyn_len);
3112         if (req == NULL) {
3113                 return NULL;
3114         }
3115         if (!tevent_req_is_in_progress(req)) {
3116                 return tevent_req_post(req, ev);
3117         }
3118         status = smb2cli_req_compound_submit(&req, 1);
3119         if (tevent_req_nterror(req, status)) {
3120                 return tevent_req_post(req, ev);
3121         }
3122         return req;
3123 }
3124
3125 static void smb2cli_req_writev_done(struct tevent_req *subreq)
3126 {
3127         struct tevent_req *req =
3128                 tevent_req_callback_data(subreq,
3129                 struct tevent_req);
3130         struct smbXcli_req_state *state =
3131                 tevent_req_data(req,
3132                 struct smbXcli_req_state);
3133         ssize_t nwritten;
3134         int err;
3135
3136         nwritten = writev_recv(subreq, &err);
3137         TALLOC_FREE(subreq);
3138         if (nwritten == -1) {
3139                 /* here, we need to notify all pending requests */
3140                 NTSTATUS status = map_nt_error_from_unix_common(err);
3141                 smbXcli_conn_disconnect(state->conn, status);
3142                 return;
3143         }
3144 }
3145
3146 static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn,
3147                                              uint8_t *buf,
3148                                              size_t buflen,
3149                                              TALLOC_CTX *mem_ctx,
3150                                              struct iovec **piov, int *pnum_iov)
3151 {
3152         struct iovec *iov;
3153         int num_iov = 0;
3154         size_t taken = 0;
3155         uint8_t *first_hdr = buf;
3156         size_t verified_buflen = 0;
3157         uint8_t *tf = NULL;
3158         size_t tf_len = 0;
3159
3160         iov = talloc_array(mem_ctx, struct iovec, num_iov);
3161         if (iov == NULL) {
3162                 return NT_STATUS_NO_MEMORY;
3163         }
3164
3165         while (taken < buflen) {
3166                 size_t len = buflen - taken;
3167                 uint8_t *hdr = first_hdr + taken;
3168                 struct iovec *cur;
3169                 size_t full_size;
3170                 size_t next_command_ofs;
3171                 uint16_t body_size;
3172                 struct iovec *iov_tmp;
3173
3174                 if (verified_buflen > taken) {
3175                         len = verified_buflen - taken;
3176                 } else {
3177                         tf = NULL;
3178                         tf_len = 0;
3179                 }
3180
3181                 if (len < 4) {
3182                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3183                                    (int)len, 4));
3184                         goto inval;
3185                 }
3186                 if (IVAL(hdr, 0) == SMB2_TF_MAGIC) {
3187                         struct smbXcli_session *s;
3188                         uint64_t uid;
3189                         struct iovec tf_iov[2];
3190                         size_t enc_len;
3191                         NTSTATUS status;
3192
3193                         if (len < SMB2_TF_HDR_SIZE) {
3194                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3195                                            (int)len, SMB2_TF_HDR_SIZE));
3196                                 goto inval;
3197                         }
3198                         tf = hdr;
3199                         tf_len = SMB2_TF_HDR_SIZE;
3200                         taken += tf_len;
3201
3202                         hdr = first_hdr + taken;
3203                         enc_len = IVAL(tf, SMB2_TF_MSG_SIZE);
3204                         uid = BVAL(tf, SMB2_TF_SESSION_ID);
3205
3206                         if (len < SMB2_TF_HDR_SIZE + enc_len) {
3207                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3208                                            (int)len,
3209                                            (int)(SMB2_TF_HDR_SIZE + enc_len)));
3210                                 goto inval;
3211                         }
3212
3213                         s = conn->sessions;
3214                         for (; s; s = s->next) {
3215                                 if (s->smb2->session_id != uid) {
3216                                         continue;
3217                                 }
3218                                 break;
3219                         }
3220
3221                         if (s == NULL) {
3222                                 DEBUG(10, ("unknown session_id %llu\n",
3223                                            (unsigned long long)uid));
3224                                 goto inval;
3225                         }
3226
3227                         tf_iov[0].iov_base = (void *)tf;
3228                         tf_iov[0].iov_len = tf_len;
3229                         tf_iov[1].iov_base = (void *)hdr;
3230                         tf_iov[1].iov_len = enc_len;
3231
3232                         status = smb2_signing_decrypt_pdu(s->smb2->decryption_key,
3233                                                           conn->protocol,
3234                                                           tf_iov, 2);
3235                         if (!NT_STATUS_IS_OK(status)) {
3236                                 TALLOC_FREE(iov);
3237                                 return status;
3238                         }
3239
3240                         verified_buflen = taken + enc_len;
3241                         len = enc_len;
3242                 }
3243
3244                 /*
3245                  * We need the header plus the body length field
3246                  */
3247
3248                 if (len < SMB2_HDR_BODY + 2) {
3249                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3250                                    (int)len, SMB2_HDR_BODY));
3251                         goto inval;
3252                 }
3253                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
3254                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
3255                                    IVAL(hdr, 0)));
3256                         goto inval;
3257                 }
3258                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
3259                         DEBUG(10, ("Got HDR len %d, expected %d\n",
3260                                    SVAL(hdr, 4), SMB2_HDR_BODY));
3261                         goto inval;
3262                 }
3263
3264                 full_size = len;
3265                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
3266                 body_size = SVAL(hdr, SMB2_HDR_BODY);
3267
3268                 if (next_command_ofs != 0) {
3269                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
3270                                 goto inval;
3271                         }
3272                         if (next_command_ofs > full_size) {
3273                                 goto inval;
3274                         }
3275                         full_size = next_command_ofs;
3276                 }
3277                 if (body_size < 2) {
3278                         goto inval;
3279                 }
3280                 body_size &= 0xfffe;
3281
3282                 if (body_size > (full_size - SMB2_HDR_BODY)) {
3283                         goto inval;
3284                 }
3285
3286                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
3287                                          num_iov + 4);
3288                 if (iov_tmp == NULL) {
3289                         TALLOC_FREE(iov);
3290                         return NT_STATUS_NO_MEMORY;
3291                 }
3292                 iov = iov_tmp;
3293                 cur = &iov[num_iov];
3294                 num_iov += 4;
3295
3296                 cur[0].iov_base = tf;
3297                 cur[0].iov_len  = tf_len;
3298                 cur[1].iov_base = hdr;
3299                 cur[1].iov_len  = SMB2_HDR_BODY;
3300                 cur[2].iov_base = hdr + SMB2_HDR_BODY;
3301                 cur[2].iov_len  = body_size;
3302                 cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size;
3303                 cur[3].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
3304
3305                 taken += full_size;
3306         }
3307
3308         *piov = iov;
3309         *pnum_iov = num_iov;
3310         return NT_STATUS_OK;
3311
3312 inval:
3313         TALLOC_FREE(iov);
3314         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3315 }
3316
3317 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
3318                                                     uint64_t mid)
3319 {
3320         size_t num_pending = talloc_array_length(conn->pending);
3321         size_t i;
3322
3323         for (i=0; i<num_pending; i++) {
3324                 struct tevent_req *req = conn->pending[i];
3325                 struct smbXcli_req_state *state =
3326                         tevent_req_data(req,
3327                         struct smbXcli_req_state);
3328
3329                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
3330                         return req;
3331                 }
3332         }
3333         return NULL;
3334 }
3335
3336 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3337                                                TALLOC_CTX *tmp_mem,
3338                                                uint8_t *inbuf)
3339 {
3340         struct tevent_req *req;
3341         struct smbXcli_req_state *state = NULL;
3342         struct iovec *iov;
3343         int i, num_iov;
3344         NTSTATUS status;
3345         bool defer = true;
3346         struct smbXcli_session *last_session = NULL;
3347         size_t inbuf_len = smb_len_tcp(inbuf);
3348
3349         status = smb2cli_inbuf_parse_compound(conn,
3350                                               inbuf + NBT_HDR_SIZE,
3351                                               inbuf_len,
3352                                               tmp_mem,
3353                                               &iov, &num_iov);
3354         if (!NT_STATUS_IS_OK(status)) {
3355                 return status;
3356         }
3357
3358         for (i=0; i<num_iov; i+=4) {
3359                 uint8_t *inbuf_ref = NULL;
3360                 struct iovec *cur = &iov[i];
3361                 uint8_t *inhdr = (uint8_t *)cur[1].iov_base;
3362                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
3363                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
3364                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
3365                 uint16_t req_opcode;
3366                 uint32_t req_flags;
3367                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
3368                 uint32_t new_credits;
3369                 struct smbXcli_session *session = NULL;
3370                 const DATA_BLOB *signing_key = NULL;
3371                 bool was_encrypted = false;
3372
3373                 new_credits = conn->smb2.cur_credits;
3374                 new_credits += credits;
3375                 if (new_credits > UINT16_MAX) {
3376                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3377                 }
3378                 conn->smb2.cur_credits += credits;
3379
3380                 req = smb2cli_conn_find_pending(conn, mid);
3381                 if (req == NULL) {
3382                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3383                 }
3384                 state = tevent_req_data(req, struct smbXcli_req_state);
3385
3386                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3387                 if (opcode != req_opcode) {
3388                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3389                 }
3390                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
3391
3392                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
3393                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3394                 }
3395
3396                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
3397                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
3398                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
3399                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
3400
3401                         if (state->smb2.got_async) {
3402                                 /* We only expect one STATUS_PENDING response */
3403                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3404                         }
3405                         state->smb2.got_async = true;
3406
3407                         /*
3408                          * async interim responses are not signed,
3409                          * even if the SMB2_HDR_FLAG_SIGNED flag
3410                          * is set.
3411                          */
3412                         req_flags |= SMB2_HDR_FLAG_ASYNC;
3413                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
3414                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
3415
3416                         if (state->smb2.notify_async) {
3417                                 tevent_req_defer_callback(req, state->ev);
3418                                 tevent_req_notify_callback(req);
3419                         }
3420                         continue;
3421                 }
3422
3423                 session = state->session;
3424                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
3425                         session = last_session;
3426                 }
3427                 last_session = session;
3428
3429                 if (state->smb2.should_sign) {
3430                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
3431                                 return NT_STATUS_ACCESS_DENIED;
3432                         }
3433                 }
3434
3435                 if (flags & SMB2_HDR_FLAG_SIGNED) {
3436                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
3437
3438                         if (session == NULL) {
3439                                 struct smbXcli_session *s;
3440
3441                                 s = state->conn->sessions;
3442                                 for (; s; s = s->next) {
3443                                         if (s->smb2->session_id != uid) {
3444                                                 continue;
3445                                         }
3446
3447                                         session = s;
3448                                         break;
3449                                 }
3450                         }
3451
3452                         if (session == NULL) {
3453                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3454                         }
3455
3456                         last_session = session;
3457                         signing_key = &session->smb2_channel.signing_key;
3458                 }
3459
3460                 if (opcode == SMB2_OP_SESSSETUP) {
3461                         /*
3462                          * We prefer the channel signing key, if it is
3463                          * already there.
3464                          *
3465                          * If we do not have a channel signing key yet,
3466                          * we try the main signing key, if it is not
3467                          * the final response.
3468                          */
3469                         if (signing_key && signing_key->length == 0 &&
3470                             !NT_STATUS_IS_OK(status)) {
3471                                 signing_key = &session->smb2->signing_key;
3472                         }
3473
3474                         if (signing_key && signing_key->length == 0) {
3475                                 /*
3476                                  * If we do not have a session key to
3477                                  * verify the signature, we defer the
3478                                  * signing check to the caller.
3479                                  *
3480                                  * The caller gets NT_STATUS_OK, it
3481                                  * has to call
3482                                  * smb2cli_session_set_session_key()
3483                                  * or
3484                                  * smb2cli_session_set_channel_key()
3485                                  * which will check the signature
3486                                  * with the channel signing key.
3487                                  */
3488                                 signing_key = NULL;
3489                         }
3490                 }
3491
3492                 if (cur[0].iov_len == SMB2_TF_HDR_SIZE) {
3493                         const uint8_t *tf = (const uint8_t *)cur[0].iov_base;
3494                         uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID);
3495
3496                         /*
3497                          * If the response was encrypted in a SMB2_TRANSFORM
3498                          * pdu, which belongs to the correct session,
3499                          * we do not need to do signing checks
3500                          *
3501                          * It could be the session the response belongs to
3502                          * or the session that was used to encrypt the
3503                          * SMB2_TRANSFORM request.
3504                          */
3505                         if ((session && session->smb2->session_id == uid) ||
3506                             (state->smb2.encryption_session_id == uid)) {
3507                                 signing_key = NULL;
3508                                 was_encrypted = true;
3509                         }
3510                 }
3511
3512                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
3513                         /*
3514                          * if the server returns NT_STATUS_USER_SESSION_DELETED
3515                          * the response is not signed and we should
3516                          * propagate the NT_STATUS_USER_SESSION_DELETED
3517                          * status to the caller.
3518                          */
3519                         state->smb2.signing_skipped = true;
3520                         signing_key = NULL;
3521                 }
3522
3523                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3524                         /*
3525                          * if the server returns
3526                          * NT_STATUS_INVALID_PARAMETER
3527                          * the response might not be encrypted.
3528                          */
3529                         if (state->smb2.should_encrypt && !was_encrypted) {
3530                                 state->smb2.signing_skipped = true;
3531                                 signing_key = NULL;
3532                         }
3533                 }
3534
3535                 if (state->smb2.should_encrypt && !was_encrypted) {
3536                         if (!state->smb2.signing_skipped) {
3537                                 return NT_STATUS_ACCESS_DENIED;
3538                         }
3539                 }
3540
3541                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
3542                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
3543                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3544                         /*
3545                          * if the server returns
3546                          * NT_STATUS_NETWORK_NAME_DELETED
3547                          * NT_STATUS_FILE_CLOSED
3548                          * NT_STATUS_INVALID_PARAMETER
3549                          * the response might not be signed
3550                          * as this happens before the signing checks.
3551                          *
3552                          * If server echos the signature (or all zeros)
3553                          * we should report the status from the server
3554                          * to the caller.
3555                          */
3556                         if (signing_key) {
3557                                 int cmp;
3558
3559                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3560                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
3561                                              16);
3562                                 if (cmp == 0) {
3563                                         state->smb2.signing_skipped = true;
3564                                         signing_key = NULL;
3565                                 }
3566                         }
3567                         if (signing_key) {
3568                                 int cmp;
3569                                 static const uint8_t zeros[16];
3570
3571                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3572                                              zeros,
3573                                              16);
3574                                 if (cmp == 0) {
3575                                         state->smb2.signing_skipped = true;
3576                                         signing_key = NULL;
3577                                 }
3578                         }
3579                 }
3580
3581                 if (signing_key) {
3582                         status = smb2_signing_check_pdu(*signing_key,
3583                                                         state->conn->protocol,
3584                                                         &cur[1], 3);
3585                         if (!NT_STATUS_IS_OK(status)) {
3586                                 /*
3587                                  * If the signing check fails, we disconnect
3588                                  * the connection.
3589                                  */
3590                                 return status;
3591                         }
3592                 }
3593
3594                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
3595                     (session != NULL) && session->disconnect_expired)
3596                 {
3597                         /*
3598                          * this should be a short term hack
3599                          * until the upper layers have implemented
3600                          * re-authentication.
3601                          */
3602                         return status;
3603                 }
3604
3605                 smbXcli_req_unset_pending(req);
3606
3607                 /*
3608                  * There might be more than one response
3609                  * we need to defer the notifications
3610                  */
3611                 if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) {
3612                         defer = false;
3613                 }
3614
3615                 if (defer) {
3616                         tevent_req_defer_callback(req, state->ev);
3617                 }
3618
3619                 /*
3620                  * Note: here we use talloc_reference() in a way
3621                  *       that does not expose it to the caller.
3622                  */
3623                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3624                 if (tevent_req_nomem(inbuf_ref, req)) {
3625                         continue;
3626                 }
3627
3628                 /* copy the related buffers */
3629                 state->smb2.recv_iov[0] = cur[1];
3630                 state->smb2.recv_iov[1] = cur[2];
3631                 state->smb2.recv_iov[2] = cur[3];
3632
3633                 tevent_req_done(req);
3634         }
3635
3636         if (defer) {
3637                 return NT_STATUS_RETRY;
3638         }
3639
3640         return NT_STATUS_OK;
3641 }
3642
3643 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3644                           struct iovec **piov,
3645                           const struct smb2cli_req_expected_response *expected,
3646                           size_t num_expected)
3647 {
3648         struct smbXcli_req_state *state =
3649                 tevent_req_data(req,
3650                 struct smbXcli_req_state);
3651         NTSTATUS status;
3652         size_t body_size;
3653         bool found_status = false;
3654         bool found_size = false;
3655         size_t i;
3656
3657         if (piov != NULL) {
3658                 *piov = NULL;
3659         }
3660
3661         if (tevent_req_is_in_progress(req) && state->smb2.got_async) {
3662                 return STATUS_PENDING;
3663         }
3664
3665         if (tevent_req_is_nterror(req, &status)) {
3666                 for (i=0; i < num_expected; i++) {
3667                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
3668                                 found_status = true;
3669                                 break;
3670                         }
3671                 }
3672
3673                 if (found_status) {
3674                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3675                 }
3676
3677                 return status;
3678         }
3679
3680         if (num_expected == 0) {
3681                 found_status = true;
3682                 found_size = true;
3683         }
3684
3685         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3686         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3687
3688         for (i=0; i < num_expected; i++) {
3689                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3690                         continue;
3691                 }
3692
3693                 found_status = true;
3694                 if (expected[i].body_size == 0) {
3695                         found_size = true;
3696                         break;
3697                 }
3698
3699                 if (expected[i].body_size == body_size) {
3700                         found_size = true;
3701                         break;
3702                 }
3703         }
3704
3705         if (!found_status) {
3706                 return status;
3707         }
3708
3709         if (state->smb2.signing_skipped) {
3710                 if (num_expected > 0) {
3711                         return NT_STATUS_ACCESS_DENIED;
3712                 }
3713                 if (!NT_STATUS_IS_ERR(status)) {
3714                         return NT_STATUS_ACCESS_DENIED;
3715                 }
3716         }
3717
3718         if (!found_size) {
3719                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3720         }
3721
3722         if (piov != NULL) {
3723                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3724         }
3725
3726         return status;
3727 }
3728
3729 NTSTATUS smb2cli_req_get_sent_iov(struct tevent_req *req,
3730                                   struct iovec *sent_iov)
3731 {
3732         struct smbXcli_req_state *state =
3733                 tevent_req_data(req,
3734                 struct smbXcli_req_state);
3735
3736         if (tevent_req_is_in_progress(req)) {
3737                 return STATUS_PENDING;
3738         }
3739
3740         sent_iov[0].iov_base = state->smb2.hdr;
3741         sent_iov[0].iov_len  = sizeof(state->smb2.hdr);
3742
3743         sent_iov[1].iov_base = discard_const(state->smb2.fixed);
3744         sent_iov[1].iov_len  = state->smb2.fixed_len;
3745
3746         if (state->smb2.dyn != NULL) {
3747                 sent_iov[2].iov_base = discard_const(state->smb2.dyn);
3748                 sent_iov[2].iov_len  = state->smb2.dyn_len;
3749         } else {
3750                 sent_iov[2].iov_base = NULL;
3751                 sent_iov[2].iov_len  = 0;
3752         }
3753
3754         return NT_STATUS_OK;
3755 }
3756
3757 static const struct {
3758         enum protocol_types proto;
3759         const char *smb1_name;
3760 } smb1cli_prots[] = {
3761         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3762         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3763         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3764         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3765         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3766         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3767         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3768         {PROTOCOL_LANMAN2,      "Samba"},
3769         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3770         {PROTOCOL_NT1,          "NT LM 0.12"},
3771         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3772         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3773 };
3774
3775 static const struct {
3776         enum protocol_types proto;
3777         uint16_t smb2_dialect;
3778 } smb2cli_prots[] = {
3779         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3780         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3781         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3782         {PROTOCOL_SMB2_24,      SMB2_DIALECT_REVISION_224},
3783         {PROTOCOL_SMB3_00,      SMB3_DIALECT_REVISION_300},
3784         {PROTOCOL_SMB3_02,      SMB3_DIALECT_REVISION_302},
3785         {PROTOCOL_SMB3_10,      SMB3_DIALECT_REVISION_310},
3786 };
3787
3788 struct smbXcli_negprot_state {
3789         struct smbXcli_conn *conn;
3790         struct tevent_context *ev;
3791         uint32_t timeout_msec;
3792
3793         struct {
3794                 uint8_t fixed[36];
3795         } smb2;
3796 };
3797
3798 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3799 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3800 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3801 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3802 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3803 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3804                                                   TALLOC_CTX *frame,
3805                                                   uint8_t *inbuf);
3806
3807 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3808                                         struct tevent_context *ev,
3809                                         struct smbXcli_conn *conn,
3810                                         uint32_t timeout_msec,
3811                                         enum protocol_types min_protocol,
3812                                         enum protocol_types max_protocol)
3813 {
3814         struct tevent_req *req, *subreq;
3815         struct smbXcli_negprot_state *state;
3816
3817         req = tevent_req_create(mem_ctx, &state,
3818                                 struct smbXcli_negprot_state);
3819         if (req == NULL) {
3820                 return NULL;
3821         }
3822         state->conn = conn;
3823         state->ev = ev;
3824         state->timeout_msec = timeout_msec;
3825
3826         if (min_protocol == PROTOCOL_NONE) {
3827                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3828                 return tevent_req_post(req, ev);
3829         }
3830
3831         if (max_protocol == PROTOCOL_NONE) {
3832                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3833                 return tevent_req_post(req, ev);
3834         }
3835
3836         if (min_protocol > max_protocol) {
3837                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3838                 return tevent_req_post(req, ev);
3839         }
3840
3841         conn->min_protocol = min_protocol;
3842         conn->max_protocol = max_protocol;
3843         conn->protocol = PROTOCOL_NONE;
3844
3845         if ((min_protocol < PROTOCOL_SMB2_02) &&
3846             (max_protocol < PROTOCOL_SMB2_02)) {
3847                 /*
3848                  * SMB1 only...
3849                  */
3850                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3851
3852                 subreq = smbXcli_negprot_smb1_subreq(state);
3853                 if (tevent_req_nomem(subreq, req)) {
3854                         return tevent_req_post(req, ev);
3855                 }
3856                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3857                 return req;
3858         }
3859
3860         if ((min_protocol >= PROTOCOL_SMB2_02) &&
3861             (max_protocol >= PROTOCOL_SMB2_02)) {
3862                 /*
3863                  * SMB2 only...
3864                  */
3865                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3866
3867                 subreq = smbXcli_negprot_smb2_subreq(state);
3868                 if (tevent_req_nomem(subreq, req)) {
3869                         return tevent_req_post(req, ev);
3870                 }
3871                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3872                 return req;
3873         }
3874
3875         /*
3876          * We send an SMB1 negprot with the SMB2 dialects
3877          * and expect a SMB1 or a SMB2 response.
3878          *
3879          * smbXcli_negprot_dispatch_incoming() will fix the
3880          * callback to match protocol of the response.
3881          */
3882         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
3883
3884         subreq = smbXcli_negprot_smb1_subreq(state);
3885         if (tevent_req_nomem(subreq, req)) {
3886                 return tevent_req_post(req, ev);
3887         }
3888         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
3889         return req;
3890 }
3891
3892 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
3893 {
3894         struct tevent_req *req =
3895                 tevent_req_callback_data(subreq,
3896                 struct tevent_req);
3897         NTSTATUS status;
3898
3899         /*
3900          * we just want the low level error
3901          */
3902         status = tevent_req_simple_recv_ntstatus(subreq);
3903         TALLOC_FREE(subreq);
3904         if (tevent_req_nterror(req, status)) {
3905                 return;
3906         }
3907
3908         /* this should never happen */
3909         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3910 }
3911
3912 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
3913 {
3914         size_t i;
3915         DATA_BLOB bytes = data_blob_null;
3916         uint8_t flags;
3917         uint16_t flags2;
3918
3919         /* setup the protocol strings */
3920         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3921                 uint8_t c = 2;
3922                 bool ok;
3923
3924                 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
3925                         continue;
3926                 }
3927
3928                 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
3929                         continue;
3930                 }
3931
3932                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
3933                 if (!ok) {
3934                         return NULL;
3935                 }
3936
3937                 /*
3938                  * We now it is already ascii and
3939                  * we want NULL termination.
3940                  */
3941                 ok = data_blob_append(state, &bytes,
3942                                       smb1cli_prots[i].smb1_name,
3943                                       strlen(smb1cli_prots[i].smb1_name)+1);
3944                 if (!ok) {
3945                         return NULL;
3946                 }
3947         }
3948
3949         smb1cli_req_flags(state->conn->max_protocol,
3950                           state->conn->smb1.client.capabilities,
3951                           SMBnegprot,
3952                           0, 0, &flags,
3953                           0, 0, &flags2);
3954
3955         return smb1cli_req_send(state, state->ev, state->conn,
3956                                 SMBnegprot,
3957                                 flags, ~flags,
3958                                 flags2, ~flags2,
3959                                 state->timeout_msec,
3960                                 0xFFFE, 0, NULL, /* pid, tid, session */
3961                                 0, NULL, /* wct, vwv */
3962                                 bytes.length, bytes.data);
3963 }
3964
3965 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
3966 {
3967         struct tevent_req *req =
3968                 tevent_req_callback_data(subreq,
3969                 struct tevent_req);
3970         struct smbXcli_negprot_state *state =
3971                 tevent_req_data(req,
3972                 struct smbXcli_negprot_state);
3973         struct smbXcli_conn *conn = state->conn;
3974         struct iovec *recv_iov = NULL;
3975         uint8_t *inhdr;
3976         uint8_t wct;
3977         uint16_t *vwv;
3978         uint32_t num_bytes;
3979         uint8_t *bytes;
3980         NTSTATUS status;
3981         uint16_t protnum;
3982         size_t i;
3983         size_t num_prots = 0;
3984         uint8_t flags;
3985         uint32_t client_capabilities = conn->smb1.client.capabilities;
3986         uint32_t both_capabilities;
3987         uint32_t server_capabilities = 0;
3988         uint32_t capabilities;
3989         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
3990         uint32_t server_max_xmit = 0;
3991         uint32_t max_xmit;
3992         uint32_t server_max_mux = 0;
3993         uint16_t server_security_mode = 0;
3994         uint32_t server_session_key = 0;
3995         bool server_readbraw = false;
3996         bool server_writebraw = false;
3997         bool server_lockread = false;
3998         bool server_writeunlock = false;
3999         struct GUID server_guid = GUID_zero();
4000         DATA_BLOB server_gss_blob = data_blob_null;
4001         uint8_t server_challenge[8];
4002         char *server_workgroup = NULL;
4003         char *server_name = NULL;
4004         int server_time_zone = 0;
4005         NTTIME server_system_time = 0;
4006         static const struct smb1cli_req_expected_response expected[] = {
4007         {
4008                 .status = NT_STATUS_OK,
4009                 .wct = 0x11, /* NT1 */
4010         },
4011         {
4012                 .status = NT_STATUS_OK,
4013                 .wct = 0x0D, /* LM */
4014         },
4015         {
4016                 .status = NT_STATUS_OK,
4017                 .wct = 0x01, /* CORE */
4018         }
4019         };
4020
4021         ZERO_STRUCT(server_challenge);
4022
4023         status = smb1cli_req_recv(subreq, state,
4024                                   &recv_iov,
4025                                   &inhdr,
4026                                   &wct,
4027                                   &vwv,
4028                                   NULL, /* pvwv_offset */
4029                                   &num_bytes,
4030                                   &bytes,
4031                                   NULL, /* pbytes_offset */
4032                                   NULL, /* pinbuf */
4033                                   expected, ARRAY_SIZE(expected));
4034         TALLOC_FREE(subreq);
4035         if (tevent_req_nterror(req, status)) {
4036                 return;
4037         }
4038
4039         flags = CVAL(inhdr, HDR_FLG);
4040
4041         protnum = SVAL(vwv, 0);
4042
4043         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
4044                 if (smb1cli_prots[i].proto < state->conn->min_protocol) {
4045                         continue;
4046                 }
4047
4048                 if (smb1cli_prots[i].proto > state->conn->max_protocol) {
4049                         continue;
4050                 }
4051
4052                 if (protnum != num_prots) {
4053                         num_prots++;
4054                         continue;
4055                 }
4056
4057                 conn->protocol = smb1cli_prots[i].proto;
4058                 break;
4059         }
4060
4061         if (conn->protocol == PROTOCOL_NONE) {
4062                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4063                 return;
4064         }
4065
4066         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
4067                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
4068                          "and the selected protocol level doesn't support it.\n"));
4069                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4070                 return;
4071         }
4072
4073         if (flags & FLAG_SUPPORT_LOCKREAD) {
4074                 server_lockread = true;
4075                 server_writeunlock = true;
4076         }
4077
4078         if (conn->protocol >= PROTOCOL_NT1) {
4079                 const char *client_signing = NULL;
4080                 bool server_mandatory = false;
4081                 bool server_allowed = false;
4082                 const char *server_signing = NULL;
4083                 bool ok;
4084                 uint8_t key_len;
4085
4086                 if (wct != 0x11) {
4087                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4088                         return;
4089                 }
4090
4091                 /* NT protocol */
4092                 server_security_mode = CVAL(vwv + 1, 0);
4093                 server_max_mux = SVAL(vwv + 1, 1);
4094                 server_max_xmit = IVAL(vwv + 3, 1);
4095                 server_session_key = IVAL(vwv + 7, 1);
4096                 server_time_zone = SVALS(vwv + 15, 1);
4097                 server_time_zone *= 60;
4098                 /* this time arrives in real GMT */
4099                 server_system_time = BVAL(vwv + 11, 1);
4100                 server_capabilities = IVAL(vwv + 9, 1);
4101
4102                 key_len = CVAL(vwv + 16, 1);
4103
4104                 if (server_capabilities & CAP_RAW_MODE) {
4105                         server_readbraw = true;
4106                         server_writebraw = true;
4107                 }
4108                 if (server_capabilities & CAP_LOCK_AND_READ) {
4109                         server_lockread = true;
4110                 }
4111
4112                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
4113                         DATA_BLOB blob1, blob2;
4114
4115                         if (num_bytes < 16) {
4116                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4117                                 return;
4118                         }
4119
4120                         blob1 = data_blob_const(bytes, 16);
4121                         status = GUID_from_data_blob(&blob1, &server_guid);
4122                         if (tevent_req_nterror(req, status)) {
4123                                 return;
4124                         }
4125
4126                         blob1 = data_blob_const(bytes+16, num_bytes-16);
4127                         blob2 = data_blob_dup_talloc(state, blob1);
4128                         if (blob1.length > 0 &&
4129                             tevent_req_nomem(blob2.data, req)) {
4130                                 return;
4131                         }
4132                         server_gss_blob = blob2;
4133                 } else {
4134                         DATA_BLOB blob1, blob2;
4135
4136                         if (num_bytes < key_len) {
4137                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4138                                 return;
4139                         }
4140
4141                         if (key_len != 0 && key_len != 8) {
4142                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4143                                 return;
4144                         }
4145
4146                         if (key_len == 8) {
4147                                 memcpy(server_challenge, bytes, 8);
4148                         }
4149
4150                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4151                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
4152                         if (blob1.length > 0) {
4153                                 size_t len;
4154
4155                                 len = utf16_len_n(blob1.data,
4156                                                   blob1.length);
4157                                 blob1.length = len;
4158
4159                                 ok = convert_string_talloc(state,
4160                                                            CH_UTF16LE,
4161                                                            CH_UNIX,
4162                                                            blob1.data,
4163                                                            blob1.length,
4164                                                            &server_workgroup,
4165                                                            &len);
4166                                 if (!ok) {
4167                                         status = map_nt_error_from_unix_common(errno);
4168                                         tevent_req_nterror(req, status);
4169                                         return;
4170                                 }
4171                         }
4172
4173                         blob2.data += blob1.length;
4174                         blob2.length -= blob1.length;
4175                         if (blob2.length > 0) {
4176                                 size_t len;
4177
4178                                 len = utf16_len_n(blob1.data,
4179                                                   blob1.length);
4180                                 blob1.length = len;
4181
4182                                 ok = convert_string_talloc(state,
4183                                                            CH_UTF16LE,
4184                                                            CH_UNIX,
4185                                                            blob2.data,
4186                                                            blob2.length,
4187                                                            &server_name,
4188                                                            &len);
4189                                 if (!ok) {
4190                                         status = map_nt_error_from_unix_common(errno);
4191                                         tevent_req_nterror(req, status);
4192                                         return;
4193                                 }
4194                         }
4195                 }
4196
4197                 client_signing = "disabled";
4198                 if (conn->allow_signing) {
4199                         client_signing = "allowed";
4200                 }
4201                 if (conn->mandatory_signing) {
4202                         client_signing = "required";
4203                 }
4204
4205                 server_signing = "not supported";
4206                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
4207                         server_signing = "supported";
4208                         server_allowed = true;
4209                 } else if (conn->mandatory_signing) {
4210                         /*
4211                          * We have mandatory signing as client
4212                          * lets assume the server will look at our
4213                          * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED
4214                          * flag in the session setup
4215                          */
4216                         server_signing = "not announced";
4217                         server_allowed = true;
4218                 }
4219                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
4220                         server_signing = "required";
4221                         server_mandatory = true;
4222                 }
4223
4224                 ok = smb_signing_set_negotiated(conn->smb1.signing,
4225                                                 server_allowed,
4226                                                 server_mandatory);
4227                 if (!ok) {
4228                         DEBUG(1,("cli_negprot: SMB signing is required, "
4229                                  "but client[%s] and server[%s] mismatch\n",
4230                                  client_signing, server_signing));
4231                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4232                         return;
4233                 }
4234
4235         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
4236                 DATA_BLOB blob1;
4237                 uint8_t key_len;
4238                 time_t t;
4239
4240                 if (wct != 0x0D) {
4241                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4242                         return;
4243                 }
4244
4245                 server_security_mode = SVAL(vwv + 1, 0);
4246                 server_max_xmit = SVAL(vwv + 2, 0);
4247                 server_max_mux = SVAL(vwv + 3, 0);
4248                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
4249                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
4250                 server_session_key = IVAL(vwv + 6, 0);
4251                 server_time_zone = SVALS(vwv + 10, 0);
4252                 server_time_zone *= 60;
4253                 /* this time is converted to GMT by make_unix_date */
4254                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
4255                 unix_to_nt_time(&server_system_time, t);
4256                 key_len = SVAL(vwv + 11, 0);
4257
4258                 if (num_bytes < key_len) {
4259                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4260                         return;
4261                 }
4262
4263                 if (key_len != 0 && key_len != 8) {
4264                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4265                         return;
4266                 }
4267
4268                 if (key_len == 8) {
4269                         memcpy(server_challenge, bytes, 8);
4270                 }
4271
4272                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4273                 if (blob1.length > 0) {
4274                         size_t len;
4275                         bool ok;
4276
4277                         len = utf16_len_n(blob1.data,
4278                                           blob1.length);
4279                         blob1.length = len;
4280
4281                         ok = convert_string_talloc(state,
4282                                                    CH_DOS,
4283                                                    CH_UNIX,
4284                                                    blob1.data,
4285                                                    blob1.length,
4286                                                    &server_workgroup,
4287                                                    &len);
4288                         if (!ok) {
4289                                 status = map_nt_error_from_unix_common(errno);
4290                                 tevent_req_nterror(req, status);
4291                                 return;
4292                         }
4293                 }
4294
4295         } else {
4296                 /* the old core protocol */
4297                 server_time_zone = get_time_zone(time(NULL));
4298                 server_max_xmit = 1024;
4299                 server_max_mux = 1;
4300         }
4301
4302         if (server_max_xmit < 1024) {
4303                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4304                 return;
4305         }
4306
4307         if (server_max_mux < 1) {
4308                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4309                 return;
4310         }
4311
4312         /*
4313          * Now calculate the negotiated capabilities
4314          * based on the mask for:
4315          * - client only flags
4316          * - flags used in both directions
4317          * - server only flags
4318          */
4319         both_capabilities = client_capabilities & server_capabilities;
4320         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
4321         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
4322         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
4323
4324         max_xmit = MIN(client_max_xmit, server_max_xmit);
4325
4326         conn->smb1.server.capabilities = server_capabilities;
4327         conn->smb1.capabilities = capabilities;
4328
4329         conn->smb1.server.max_xmit = server_max_xmit;
4330         conn->smb1.max_xmit = max_xmit;
4331
4332         conn->smb1.server.max_mux = server_max_mux;
4333
4334         conn->smb1.server.security_mode = server_security_mode;
4335
4336         conn->smb1.server.readbraw = server_readbraw;
4337         conn->smb1.server.writebraw = server_writebraw;
4338         conn->smb1.server.lockread = server_lockread;
4339         conn->smb1.server.writeunlock = server_writeunlock;
4340
4341         conn->smb1.server.session_key = server_session_key;
4342
4343         talloc_steal(conn, server_gss_blob.data);
4344         conn->smb1.server.gss_blob = server_gss_blob;
4345         conn->smb1.server.guid = server_guid;
4346         memcpy(conn->smb1.server.challenge, server_challenge, 8);
4347         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
4348         conn->smb1.server.name = talloc_move(conn, &server_name);
4349
4350         conn->smb1.server.time_zone = server_time_zone;
4351         conn->smb1.server.system_time = server_system_time;
4352
4353         tevent_req_done(req);
4354 }
4355
4356 static size_t smbXcli_padding_helper(uint32_t offset, size_t n)
4357 {
4358         if ((offset & (n-1)) == 0) return 0;
4359         return n - (offset & (n-1));
4360 }
4361
4362 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
4363 {
4364         size_t i;
4365         uint8_t *buf;
4366         uint16_t dialect_count = 0;
4367         DATA_BLOB dyn = data_blob_null;
4368
4369         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4370                 bool ok;
4371                 uint8_t val[2];
4372
4373                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4374                         continue;
4375                 }
4376
4377                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4378                         continue;
4379                 }
4380
4381                 SSVAL(val, 0, smb2cli_prots[i].smb2_dialect);
4382
4383                 ok = data_blob_append(state, &dyn, val, sizeof(val));
4384                 if (!ok) {
4385                         return NULL;
4386                 }
4387
4388                 dialect_count++;
4389         }
4390
4391         buf = state->smb2.fixed;
4392         SSVAL(buf, 0, 36);
4393         SSVAL(buf, 2, dialect_count);
4394         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
4395         SSVAL(buf, 6, 0);       /* Reserved */
4396         if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
4397                 SIVAL(buf, 8, state->conn->smb2.client.capabilities);
4398         } else {
4399                 SIVAL(buf, 8, 0);       /* Capabilities */
4400         }
4401         if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
4402                 NTSTATUS status;
4403                 DATA_BLOB blob;
4404
4405                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
4406                                           state, &blob);
4407                 if (!NT_STATUS_IS_OK(status)) {
4408                         return NULL;
4409                 }
4410                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
4411         } else {
4412                 memset(buf+12, 0, 16);  /* ClientGuid */
4413         }
4414
4415         if (state->conn->max_protocol >= PROTOCOL_SMB3_10) {
4416                 NTSTATUS status;
4417                 struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4418                 uint32_t offset;
4419                 DATA_BLOB b;
4420                 uint8_t p[38];
4421                 const uint8_t zeros[8] = {0, };
4422                 size_t pad;
4423                 bool ok;
4424
4425                 SSVAL(p, 0,  1); /* HashAlgorithmCount */
4426                 SSVAL(p, 2, 32); /* SaltLength */
4427                 SSVAL(p, 4, SMB2_PREAUTH_INTEGRITY_SHA512);
4428                 generate_random_buffer(p + 6, 32);
4429
4430                 b = data_blob_const(p, 38);
4431                 status = smb2_negotiate_context_add(state, &c,
4432                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES, b);
4433                 if (!NT_STATUS_IS_OK(status)) {
4434                         return NULL;
4435                 }
4436
4437                 SSVAL(p, 0, 1); /* ChiperCount */
4438                 SSVAL(p, 2, SMB2_ENCRYPTION_AES128_CCM);
4439
4440                 b = data_blob_const(p, 4);
4441                 status = smb2_negotiate_context_add(state, &c,
4442                                         SMB2_ENCRYPTION_CAPABILITIES, b);
4443                 if (!NT_STATUS_IS_OK(status)) {
4444                         return NULL;
4445                 }
4446
4447                 status = smb2_negotiate_context_push(state, &b, c);
4448                 if (!NT_STATUS_IS_OK(status)) {
4449                         return NULL;
4450                 }
4451
4452                 offset = SMB2_HDR_BODY + sizeof(state->smb2.fixed) + dyn.length;
4453                 pad = smbXcli_padding_helper(offset, 8);
4454
4455                 ok = data_blob_append(state, &dyn, zeros, pad);
4456                 if (!ok) {
4457                         return NULL;
4458                 }
4459                 offset += pad;
4460
4461                 ok = data_blob_append(state, &dyn, b.data, b.length);
4462                 if (!ok) {
4463                         return NULL;
4464                 }
4465
4466                 SIVAL(buf, 28, offset);   /* NegotiateContextOffset */
4467                 SSVAL(buf, 32, c.num_contexts); /* NegotiateContextCount */
4468                 SSVAL(buf, 34, 0);        /* Reserved */
4469         } else {
4470                 SBVAL(buf, 28, 0);      /* Reserved/ClientStartTime */
4471         }
4472
4473         return smb2cli_req_send(state, state->ev,
4474                                 state->conn, SMB2_OP_NEGPROT,
4475                                 0, 0, /* flags */
4476                                 state->timeout_msec,
4477                                 NULL, NULL, /* tcon, session */
4478                                 state->smb2.fixed, sizeof(state->smb2.fixed),
4479                                 dyn.data, dyn.length,
4480                                 UINT16_MAX); /* max_dyn_len */
4481 }
4482
4483 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
4484 {
4485         struct tevent_req *req =
4486                 tevent_req_callback_data(subreq,
4487                 struct tevent_req);
4488         struct smbXcli_negprot_state *state =
4489                 tevent_req_data(req,
4490                 struct smbXcli_negprot_state);
4491         struct smbXcli_conn *conn = state->conn;
4492         size_t security_offset, security_length;
4493         DATA_BLOB blob;
4494         NTSTATUS status;
4495         struct iovec *iov;
4496         uint8_t *body;
4497         size_t i;
4498         uint16_t dialect_revision;
4499         struct smb2_negotiate_contexts c = { .num_contexts = 0, };
4500         uint32_t negotiate_context_offset = 0;
4501         uint16_t negotiate_context_count = 0;
4502         DATA_BLOB negotiate_context_blob = data_blob_null;
4503         size_t avail;
4504         size_t ctx_ofs;
4505         size_t needed;
4506         struct smb2_negotiate_context *preauth = NULL;
4507         uint16_t hash_count;
4508         uint16_t salt_length;
4509         uint16_t hash_selected;
4510         struct hc_sha512state sctx;
4511         struct smb2_negotiate_context *cipher = NULL;
4512         struct iovec sent_iov[3];
4513         static const struct smb2cli_req_expected_response expected[] = {
4514         {
4515                 .status = NT_STATUS_OK,
4516                 .body_size = 0x41
4517         }
4518         };
4519
4520         status = smb2cli_req_recv(subreq, state, &iov,
4521                                   expected, ARRAY_SIZE(expected));
4522         if (tevent_req_nterror(req, status)) {
4523                 return;
4524         }
4525
4526         body = (uint8_t *)iov[1].iov_base;
4527
4528         dialect_revision = SVAL(body, 4);
4529
4530         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4531                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4532                         continue;
4533                 }
4534
4535                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4536                         continue;
4537                 }
4538
4539                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
4540                         continue;
4541                 }
4542
4543                 conn->protocol = smb2cli_prots[i].proto;
4544                 break;
4545         }
4546
4547         if (conn->protocol == PROTOCOL_NONE) {
4548                 TALLOC_FREE(subreq);
4549
4550                 if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
4551                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4552                         return;
4553                 }
4554
4555                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
4556                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4557                         return;
4558                 }
4559
4560                 /* make sure we do not loop forever */
4561                 state->conn->min_protocol = PROTOCOL_SMB2_02;
4562
4563                 /*
4564                  * send a SMB2 negprot, in order to negotiate
4565                  * the SMB2 dialect.
4566                  */
4567                 subreq = smbXcli_negprot_smb2_subreq(state);
4568                 if (tevent_req_nomem(subreq, req)) {
4569                         return;
4570                 }
4571                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4572                 return;
4573         }
4574
4575         conn->smb2.server.security_mode = SVAL(body, 2);
4576         if (conn->protocol >= PROTOCOL_SMB3_10) {
4577                 negotiate_context_count = SVAL(body, 6);
4578         }
4579
4580         blob = data_blob_const(body + 8, 16);
4581         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
4582         if (tevent_req_nterror(req, status)) {
4583                 return;
4584         }
4585
4586         conn->smb2.server.capabilities  = IVAL(body, 24);
4587         conn->smb2.server.max_trans_size= IVAL(body, 28);
4588         conn->smb2.server.max_read_size = IVAL(body, 32);
4589         conn->smb2.server.max_write_size= IVAL(body, 36);
4590         conn->smb2.server.system_time   = BVAL(body, 40);
4591         conn->smb2.server.start_time    = BVAL(body, 48);
4592
4593         security_offset = SVAL(body, 56);
4594         security_length = SVAL(body, 58);
4595
4596         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
4597                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4598                 return;
4599         }
4600
4601         if (security_length > iov[2].iov_len) {
4602                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4603                 return;
4604         }
4605
4606         conn->smb2.server.gss_blob = data_blob_talloc(conn,
4607                                                 iov[2].iov_base,
4608                                                 security_length);
4609         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
4610                 return;
4611         }
4612
4613         if (conn->protocol < PROTOCOL_SMB3_10) {
4614                 TALLOC_FREE(subreq);
4615
4616                 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4617                         conn->smb2.server.cipher = SMB2_ENCRYPTION_AES128_CCM;
4618                 }
4619                 tevent_req_done(req);
4620                 return;
4621         }
4622
4623         negotiate_context_offset = IVAL(body, 60);
4624         if (negotiate_context_offset < security_offset) {
4625                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4626                 return;
4627         }
4628
4629         ctx_ofs = negotiate_context_offset - security_offset;
4630         if (ctx_ofs > iov[2].iov_len) {
4631                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4632                 return;
4633         }
4634         avail = iov[2].iov_len - security_length;
4635         needed = iov[2].iov_len - ctx_ofs;
4636         if (needed > avail) {
4637                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4638                 return;
4639         }
4640
4641         negotiate_context_blob.data = (uint8_t *)iov[2].iov_base;
4642         negotiate_context_blob.length = iov[2].iov_len;
4643
4644         negotiate_context_blob.data += ctx_ofs;
4645         negotiate_context_blob.length -= ctx_ofs;
4646
4647         status = smb2_negotiate_context_parse(state, negotiate_context_blob, &c);
4648         if (tevent_req_nterror(req, status)) {
4649                 return;
4650         }
4651
4652         if (negotiate_context_count != c.num_contexts) {
4653                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4654                 return;
4655         }
4656
4657         preauth = smb2_negotiate_context_find(&c,
4658                                         SMB2_PREAUTH_INTEGRITY_CAPABILITIES);
4659         if (preauth == NULL) {
4660                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4661                 return;
4662         }
4663
4664         if (preauth->data.length < 6) {
4665                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4666                 return;
4667         }
4668
4669         hash_count = SVAL(preauth->data.data, 0);
4670         salt_length = SVAL(preauth->data.data, 2);
4671         hash_selected = SVAL(preauth->data.data, 4);
4672
4673         if (hash_count != 1) {
4674                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4675                 return;
4676         }
4677
4678         if (preauth->data.length != (6 + salt_length)) {
4679                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4680                 return;
4681         }
4682
4683         if (hash_selected != SMB2_PREAUTH_INTEGRITY_SHA512) {
4684                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4685                 return;
4686         }
4687
4688         cipher = smb2_negotiate_context_find(&c, SMB2_ENCRYPTION_CAPABILITIES);
4689         if (cipher != NULL) {
4690                 uint16_t cipher_count;
4691
4692                 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4693                         tevent_req_nterror(req,
4694                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4695                         return;
4696                 }
4697
4698                 if (cipher->data.length < 2) {
4699                         tevent_req_nterror(req,
4700                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4701                         return;
4702                 }
4703
4704                 cipher_count = SVAL(cipher->data.data, 0);
4705
4706                 if (cipher_count > 1) {
4707                         tevent_req_nterror(req,
4708                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4709                         return;
4710                 }
4711
4712                 if (cipher->data.length != (2 + 2 * cipher_count)) {
4713                         tevent_req_nterror(req,
4714                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4715                         return;
4716                 }
4717
4718                 if (cipher_count == 1) {
4719                         uint16_t cipher_selected;
4720
4721                         cipher_selected = SVAL(cipher->data.data, 2);
4722
4723                         if (cipher_selected == SMB2_ENCRYPTION_AES128_CCM) {
4724                                 conn->smb2.server.cipher = cipher_selected;
4725                                 conn->smb2.server.capabilities |= SMB2_CAP_ENCRYPTION;
4726                         }
4727                 }
4728         } else {
4729                 if (conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION) {
4730                         tevent_req_nterror(req,
4731                                         NT_STATUS_INVALID_NETWORK_RESPONSE);
4732                         return;
4733                 }
4734         }
4735
4736         if (conn->smb2.server.cipher == 0) {
4737                 /*
4738                  * We didn't manage to negotiate a common encryption
4739                  * algorithm.
4740                  */
4741                 conn->smb2.server.capabilities &= ~SMB2_CAP_ENCRYPTION;
4742         }
4743
4744         /* First we hash the request */
4745         smb2cli_req_get_sent_iov(subreq, sent_iov);
4746         SHA512_Init(&sctx);
4747         SHA512_Update(&sctx, conn->smb2.preauth_sha512,
4748                       sizeof(conn->smb2.preauth_sha512));
4749         for (i = 0; i < 3; i++) {
4750                 SHA512_Update(&sctx, sent_iov[i].iov_base, sent_iov[i].iov_len);
4751         }
4752         SHA512_Final(conn->smb2.preauth_sha512, &sctx);
4753         TALLOC_FREE(subreq);
4754
4755         /* And now we hash the response */
4756         SHA512_Init(&sctx);
4757         SHA512_Update(&sctx, conn->smb2.preauth_sha512,
4758                       sizeof(conn->smb2.preauth_sha512));
4759         for (i = 0; i < 3; i++) {
4760                 SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
4761         }
4762         SHA512_Final(conn->smb2.preauth_sha512, &sctx);
4763
4764         tevent_req_done(req);
4765 }
4766
4767 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
4768                                                   TALLOC_CTX *tmp_mem,
4769                                                   uint8_t *inbuf)
4770 {
4771         size_t num_pending = talloc_array_length(conn->pending);
4772         struct tevent_req *subreq;
4773         struct smbXcli_req_state *substate;
4774         struct tevent_req *req;
4775         uint32_t protocol_magic;
4776         size_t inbuf_len = smb_len_nbt(inbuf);
4777
4778         if (num_pending != 1) {
4779                 return NT_STATUS_INTERNAL_ERROR;
4780         }
4781
4782         if (inbuf_len < 4) {
4783                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
4784         }
4785
4786         subreq = conn->pending[0];
4787         substate = tevent_req_data(subreq, struct smbXcli_req_state);
4788         req = tevent_req_callback_data(subreq, struct tevent_req);
4789
4790         protocol_magic = IVAL(inbuf, 4);
4791
4792         switch (protocol_magic) {
4793         case SMB_MAGIC:
4794                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4795                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4796                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4797
4798         case SMB2_MAGIC:
4799                 if (substate->smb2.recv_iov == NULL) {
4800                         /*
4801                          * For the SMB1 negprot we have move it.
4802                          */
4803                         substate->smb2.recv_iov = substate->smb1.recv_iov;
4804                         substate->smb1.recv_iov = NULL;
4805                 }
4806
4807                 /*
4808                  * we got an SMB2 answer, which consumed sequence number 0
4809                  * so we need to use 1 as the next one.
4810                  *
4811                  * we also need to set the current credits to 0
4812                  * as we consumed the initial one. The SMB2 answer
4813                  * hopefully grant us a new credit.
4814                  */
4815                 conn->smb2.mid = 1;
4816                 conn->smb2.cur_credits = 0;
4817                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4818                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4819                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4820         }
4821
4822         DEBUG(10, ("Got non-SMB PDU\n"));
4823         return NT_STATUS_INVALID_NETWORK_RESPONSE;
4824 }
4825
4826 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
4827 {
4828         return tevent_req_simple_recv_ntstatus(req);
4829 }
4830
4831 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
4832                          uint32_t timeout_msec,
4833                          enum protocol_types min_protocol,
4834                          enum protocol_types max_protocol)
4835 {
4836         TALLOC_CTX *frame = talloc_stackframe();
4837         struct tevent_context *ev;
4838         struct tevent_req *req;
4839         NTSTATUS status = NT_STATUS_NO_MEMORY;
4840         bool ok;
4841
4842         if (smbXcli_conn_has_async_calls(conn)) {
4843                 /*
4844                  * Can't use sync call while an async call is in flight
4845                  */
4846                 status = NT_STATUS_INVALID_PARAMETER_MIX;
4847                 goto fail;
4848         }
4849         ev = samba_tevent_context_init(frame);
4850         if (ev == NULL) {
4851                 goto fail;
4852         }
4853         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
4854                                    min_protocol, max_protocol);
4855         if (req == NULL) {
4856                 goto fail;
4857         }
4858         ok = tevent_req_poll(req, ev);
4859         if (!ok) {
4860                 status = map_nt_error_from_unix_common(errno);
4861                 goto fail;
4862         }
4863         status = smbXcli_negprot_recv(req);
4864  fail:
4865         TALLOC_FREE(frame);
4866         return status;
4867 }
4868
4869 struct smb2cli_validate_negotiate_info_state {
4870         struct smbXcli_conn *conn;
4871         DATA_BLOB in_input_buffer;
4872         DATA_BLOB in_output_buffer;
4873         DATA_BLOB out_input_buffer;
4874         DATA_BLOB out_output_buffer;
4875         uint16_t dialect;
4876 };
4877
4878 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq);
4879
4880 struct tevent_req *smb2cli_validate_negotiate_info_send(TALLOC_CTX *mem_ctx,
4881                                                 struct tevent_context *ev,
4882                                                 struct smbXcli_conn *conn,
4883                                                 uint32_t timeout_msec,
4884                                                 struct smbXcli_session *session,
4885                                                 struct smbXcli_tcon *tcon)
4886 {
4887         struct tevent_req *req;
4888         struct smb2cli_validate_negotiate_info_state *state;
4889         uint8_t *buf;
4890         uint16_t dialect_count = 0;
4891         struct tevent_req *subreq;
4892         bool _save_should_sign;
4893         size_t i;
4894
4895         req = tevent_req_create(mem_ctx, &state,
4896                                 struct smb2cli_validate_negotiate_info_state);
4897         if (req == NULL) {
4898                 return NULL;
4899         }
4900         state->conn = conn;
4901
4902         state->in_input_buffer = data_blob_talloc_zero(state,
4903                                         4 + 16 + 1 + 1 + 2);
4904         if (tevent_req_nomem(state->in_input_buffer.data, req)) {
4905                 return tevent_req_post(req, ev);
4906         }
4907         buf = state->in_input_buffer.data;
4908
4909         if (state->conn->max_protocol >= PROTOCOL_SMB2_22) {
4910                 SIVAL(buf, 0, conn->smb2.client.capabilities);
4911         } else {
4912                 SIVAL(buf, 0, 0); /* Capabilities */
4913         }
4914         if (state->conn->max_protocol >= PROTOCOL_SMB2_10) {
4915                 NTSTATUS status;
4916                 DATA_BLOB blob;
4917
4918                 status = GUID_to_ndr_blob(&conn->smb2.client.guid,
4919                                           state, &blob);
4920                 if (!NT_STATUS_IS_OK(status)) {
4921                         return NULL;
4922                 }
4923                 memcpy(buf+4, blob.data, 16); /* ClientGuid */
4924         } else {
4925                 memset(buf+4, 0, 16);   /* ClientGuid */
4926         }
4927         if (state->conn->min_protocol >= PROTOCOL_SMB2_02) {
4928                 SCVAL(buf, 20, conn->smb2.client.security_mode);
4929         } else {
4930                 SCVAL(buf, 20, 0);
4931         }
4932         SCVAL(buf, 21, 0); /* reserved */
4933
4934         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4935                 bool ok;
4936                 size_t ofs;
4937
4938                 if (smb2cli_prots[i].proto < state->conn->min_protocol) {
4939                         continue;
4940                 }
4941
4942                 if (smb2cli_prots[i].proto > state->conn->max_protocol) {
4943                         continue;
4944                 }
4945
4946                 if (smb2cli_prots[i].proto == state->conn->protocol) {
4947                         state->dialect = smb2cli_prots[i].smb2_dialect;
4948                 }
4949
4950                 ofs = state->in_input_buffer.length;
4951                 ok = data_blob_realloc(state, &state->in_input_buffer,
4952                                        ofs + 2);
4953                 if (!ok) {
4954                         tevent_req_oom(req);
4955                         return tevent_req_post(req, ev);
4956                 }
4957
4958                 buf = state->in_input_buffer.data;
4959                 SSVAL(buf, ofs, smb2cli_prots[i].smb2_dialect);
4960
4961                 dialect_count++;
4962         }
4963         buf = state->in_input_buffer.data;
4964         SSVAL(buf, 22, dialect_count);
4965
4966         _save_should_sign = smb2cli_tcon_is_signing_on(tcon);
4967         smb2cli_tcon_should_sign(tcon, true);
4968         subreq = smb2cli_ioctl_send(state, ev, conn,
4969                                     timeout_msec, session, tcon,
4970                                     UINT64_MAX, /* in_fid_persistent */
4971                                     UINT64_MAX, /* in_fid_volatile */
4972                                     FSCTL_VALIDATE_NEGOTIATE_INFO,
4973                                     0, /* in_max_input_length */
4974                                     &state->in_input_buffer,
4975                                     24, /* in_max_output_length */
4976                                     &state->in_output_buffer,
4977                                     SMB2_IOCTL_FLAG_IS_FSCTL);
4978         smb2cli_tcon_should_sign(tcon, _save_should_sign);
4979         if (tevent_req_nomem(subreq, req)) {
4980                 return tevent_req_post(req, ev);
4981         }
4982         tevent_req_set_callback(subreq,
4983                                 smb2cli_validate_negotiate_info_done,
4984                                 req);
4985
4986         return req;
4987 }
4988
4989 static void smb2cli_validate_negotiate_info_done(struct tevent_req *subreq)
4990 {
4991         struct tevent_req *req =
4992                 tevent_req_callback_data(subreq,
4993                 struct tevent_req);
4994         struct smb2cli_validate_negotiate_info_state *state =
4995                 tevent_req_data(req,
4996                 struct smb2cli_validate_negotiate_info_state);
4997         NTSTATUS status;
4998         const uint8_t *buf;
4999         uint32_t capabilities;
5000         DATA_BLOB guid_blob;
5001         struct GUID server_guid;
5002         uint16_t security_mode;
5003         uint16_t dialect;
5004
5005         status = smb2cli_ioctl_recv(subreq, state,
5006                                     &state->out_input_buffer,
5007                                     &state->out_output_buffer);
5008         TALLOC_FREE(subreq);
5009         if (NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED)) {
5010                 /*
5011                  * The response was signed, but not supported
5012                  *
5013                  * Older Windows and Samba releases return
5014                  * NT_STATUS_FILE_CLOSED.
5015                  */
5016                 tevent_req_done(req);
5017                 return;
5018         }
5019         if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_DEVICE_REQUEST)) {
5020                 /*
5021                  * The response was signed, but not supported
5022                  *
5023                  * This is returned by the NTVFS based Samba 4.x file server
5024                  * for file shares.
5025                  */
5026                 tevent_req_done(req);
5027                 return;
5028         }
5029         if (NT_STATUS_EQUAL(status, NT_STATUS_FS_DRIVER_REQUIRED)) {
5030                 /*
5031                  * The response was signed, but not supported
5032                  *
5033                  * This is returned by the NTVFS based Samba 4.x file server
5034                  * for ipc shares.
5035                  */
5036                 tevent_req_done(req);
5037                 return;
5038         }
5039         if (tevent_req_nterror(req, status)) {
5040                 return;
5041         }
5042
5043         if (state->out_output_buffer.length != 24) {
5044                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
5045                 return;
5046         }
5047
5048         buf = state->out_output_buffer.data;
5049
5050         capabilities = IVAL(buf, 0);
5051         guid_blob = data_blob_const(buf + 4, 16);
5052         status = GUID_from_data_blob(&guid_blob, &server_guid);
5053         if (tevent_req_nterror(req, status)) {
5054                 return;
5055         }
5056         security_mode = CVAL(buf, 20);
5057         dialect = SVAL(buf, 22);
5058
5059         if (capabilities != state->conn->smb2.server.capabilities) {
5060                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5061                 return;
5062         }
5063
5064         if (!GUID_equal(&server_guid, &state->conn->smb2.server.guid)) {
5065                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5066                 return;
5067         }
5068
5069         if (security_mode != state->conn->smb2.server.security_mode) {
5070                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5071                 return;
5072         }
5073
5074         if (dialect != state->dialect) {
5075                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
5076                 return;
5077         }
5078
5079         tevent_req_done(req);
5080 }
5081
5082 NTSTATUS smb2cli_validate_negotiate_info_recv(struct tevent_req *req)
5083 {
5084         return tevent_req_simple_recv_ntstatus(req);
5085 }
5086
5087 static int smbXcli_session_destructor(struct smbXcli_session *session)
5088 {
5089         if (session->conn == NULL) {
5090                 return 0;
5091         }
5092
5093         DLIST_REMOVE(session->conn->sessions, session);
5094         return 0;
5095 }
5096
5097 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
5098                                                struct smbXcli_conn *conn)
5099 {
5100         struct smbXcli_session *session;
5101
5102         session = talloc_zero(mem_ctx, struct smbXcli_session);
5103         if (session == NULL) {
5104                 return NULL;
5105         }
5106         session->smb2 = talloc_zero(session, struct smb2cli_session);
5107         if (session->smb2 == NULL) {
5108                 talloc_free(session);
5109                 return NULL;
5110         }
5111         talloc_set_destructor(session, smbXcli_session_destructor);
5112
5113         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
5114         session->conn = conn;
5115
5116         memcpy(session->smb2_channel.preauth_sha512,
5117                conn->smb2.preauth_sha512,
5118                sizeof(session->smb2_channel.preauth_sha512));
5119
5120         return session;
5121 }
5122
5123 struct smbXcli_session *smbXcli_session_copy(TALLOC_CTX *mem_ctx,
5124                                                 struct smbXcli_session *src)
5125 {
5126         struct smbXcli_session *session;
5127
5128         session = talloc_zero(mem_ctx, struct smbXcli_session);
5129         if (session == NULL) {
5130                 return NULL;
5131         }
5132         session->smb2 = talloc_zero(session, struct smb2cli_session);
5133         if (session->smb2 == NULL) {
5134                 talloc_free(session);
5135                 return NULL;
5136         }
5137
5138         session->conn = src->conn;
5139         *session->smb2 = *src->smb2;
5140         session->smb2_channel = src->smb2_channel;
5141         session->disconnect_expired = src->disconnect_expired;
5142
5143         DLIST_ADD_END(src->conn->sessions, session, struct smbXcli_session *);
5144         talloc_set_destructor(session, smbXcli_session_destructor);
5145
5146         return session;
5147 }
5148
5149 bool smbXcli_session_is_authenticated(struct smbXcli_session *session)
5150 {
5151         const DATA_BLOB *application_key;
5152
5153         if (session->conn == NULL) {
5154                 return false;
5155         }
5156
5157         /*
5158          * If we have an application key we had a session key negotiated
5159          * at auth time.
5160          */
5161         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5162                 application_key = &session->smb2->application_key;
5163         } else {
5164                 application_key = &session->smb1.application_key;
5165         }
5166
5167         if (application_key->length == 0) {
5168                 return false;
5169         }
5170
5171         return true;
5172 }
5173
5174 NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session,
5175                                          TALLOC_CTX *mem_ctx,
5176                                          DATA_BLOB *key)
5177 {
5178         const DATA_BLOB *application_key;
5179
5180         *key = data_blob_null;
5181
5182         if (session->conn == NULL) {
5183                 return NT_STATUS_NO_USER_SESSION_KEY;
5184         }
5185
5186         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
5187                 application_key = &session->smb2->application_key;
5188         } else {
5189                 application_key = &session->smb1.application_key;
5190         }
5191
5192         if (application_key->length == 0) {
5193                 return NT_STATUS_NO_USER_SESSION_KEY;
5194         }
5195
5196         *key = data_blob_dup_talloc(mem_ctx, *application_key);
5197         if (key->data == NULL) {
5198                 return NT_STATUS_NO_MEMORY;
5199         }
5200
5201         return NT_STATUS_OK;
5202 }
5203
5204 void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session)
5205 {
5206         session->disconnect_expired = true;
5207 }
5208
5209 uint16_t smb1cli_session_current_id(struct smbXcli_session *session)
5210 {
5211         return session->smb1.session_id;
5212 }
5213
5214 void smb1cli_session_set_id(struct smbXcli_session *session,
5215                             uint16_t session_id)
5216 {
5217         session->smb1.session_id = session_id;
5218 }
5219
5220 NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session,
5221                                          const DATA_BLOB _session_key)
5222 {
5223         struct smbXcli_conn *conn = session->conn;
5224         uint8_t session_key[16];
5225
5226         if (conn == NULL) {
5227                 return NT_STATUS_INVALID_PARAMETER_MIX;
5228         }
5229
5230         if (session->smb1.application_key.length != 0) {
5231                 /*
5232                  * TODO: do not allow this...
5233                  *
5234                  * return NT_STATUS_INVALID_PARAMETER_MIX;
5235                  */
5236                 data_blob_clear_free(&session->smb1.application_key);
5237                 session->smb1.protected_key = false;
5238         }
5239
5240         if (_session_key.length == 0) {
5241                 return NT_STATUS_OK;
5242         }
5243
5244         ZERO_STRUCT(session_key);
5245         memcpy(session_key, _session_key.data,
5246                MIN(_session_key.length, sizeof(session_key)));
5247
5248         session->smb1.application_key = data_blob_talloc(session,
5249                                                          session_key,
5250                                                          sizeof(session_key));
5251         ZERO_STRUCT(session_key);
5252         if (session->smb1.application_key.data == NULL) {
5253                 return NT_STATUS_NO_MEMORY;
5254         }
5255
5256         session->smb1.protected_key = false;
5257
5258         return NT_STATUS_OK;
5259 }
5260
5261 NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session)
5262 {
5263         if (session->smb1.protected_key) {
5264                 /* already protected */
5265                 return NT_STATUS_OK;
5266         }
5267
5268         if (session->smb1.application_key.length != 16) {
5269                 return NT_STATUS_INVALID_PARAMETER_MIX;
5270         }
5271
5272         smb_key_derivation(session->smb1.application_key.data,
5273                            session->smb1.application_key.length,
5274                            session->smb1.application_key.data);
5275
5276         session->smb1.protected_key = true;
5277
5278         return NT_STATUS_OK;
5279 }
5280
5281 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
5282 {
5283         struct smbXcli_conn *conn = session->conn;
5284         uint8_t security_mode = 0;
5285
5286         if (conn == NULL) {
5287                 return security_mode;
5288         }
5289
5290         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
5291         if (conn->mandatory_signing) {
5292                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
5293         }
5294
5295         return security_mode;
5296 }
5297
5298 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
5299 {
5300         return session->smb2->session_id;
5301 }
5302
5303 uint16_t smb2cli_session_get_flags(struct smbXcli_session *session)
5304 {
5305         return session->smb2->session_flags;
5306 }
5307
5308 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
5309                                       uint64_t session_id,
5310                                       uint16_t session_flags)
5311 {
5312         session->smb2->session_id = session_id;
5313         session->smb2->session_flags = session_flags;
5314 }
5315
5316 void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session)
5317 {
5318         session->smb2->channel_sequence += 1;
5319 }
5320
5321 uint16_t smb2cli_session_reset_channel_sequence(struct smbXcli_session *session,
5322                                                 uint16_t channel_sequence)
5323 {
5324         uint16_t prev_cs;
5325
5326         prev_cs = session->smb2->channel_sequence;
5327         session->smb2->channel_sequence = channel_sequence;
5328
5329         return prev_cs;
5330 }
5331
5332 void smb2cli_session_start_replay(struct smbXcli_session *session)
5333 {
5334         session->smb2->replay_active = true;
5335 }
5336
5337 void smb2cli_session_stop_replay(struct smbXcli_session *session)
5338 {
5339         session->smb2->replay_active = false;
5340 }
5341
5342 NTSTATUS smb2cli_session_update_preauth(struct smbXcli_session *session,
5343                                         const struct iovec *iov)
5344 {
5345         struct hc_sha512state sctx;
5346         size_t i;
5347
5348         if (session->conn == NULL) {
5349                 return NT_STATUS_INTERNAL_ERROR;
5350         }
5351
5352         if (session->conn->protocol < PROTOCOL_SMB3_10) {
5353                 return NT_STATUS_OK;
5354         }
5355
5356         if (session->smb2_channel.signing_key.length != 0) {
5357                 return NT_STATUS_OK;
5358         }
5359
5360         SHA512_Init(&sctx);
5361         SHA512_Update(&sctx, session->smb2_channel.preauth_sha512,
5362                       sizeof(session->smb2_channel.preauth_sha512));
5363         for (i = 0; i < 3; i++) {
5364                 SHA512_Update(&sctx, iov[i].iov_base, iov[i].iov_len);
5365         }
5366         SHA512_Final(session->smb2_channel.preauth_sha512, &sctx);
5367
5368         return NT_STATUS_OK;
5369 }
5370
5371 NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
5372                                          const DATA_BLOB _session_key,
5373                                          const struct iovec *recv_iov)
5374 {
5375         struct smbXcli_conn *conn = session->conn;
5376         uint16_t no_sign_flags;
5377         uint8_t session_key[16];
5378         bool check_signature = true;
5379         uint32_t hdr_flags;
5380         NTSTATUS status;
5381         struct _derivation {
5382                 DATA_BLOB label;
5383                 DATA_BLOB context;
5384         };
5385         struct {
5386                 struct _derivation signing;
5387                 struct _derivation encryption;
5388                 struct _derivation decryption;
5389                 struct _derivation application;
5390         } derivation = { };
5391
5392         if (conn == NULL) {
5393                 return NT_STATUS_INVALID_PARAMETER_MIX;
5394         }
5395
5396         if (recv_iov[0].iov_len != SMB2_HDR_BODY) {
5397                 return NT_STATUS_INVALID_PARAMETER_MIX;
5398         }
5399
5400         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
5401
5402         if (session->smb2->session_flags & no_sign_flags) {
5403                 session->smb2->should_sign = false;
5404                 return NT_STATUS_OK;
5405         }
5406
5407         if (session->smb2->signing_key.length != 0) {
5408                 return NT_STATUS_INVALID_PARAMETER_MIX;
5409         }
5410
5411         if (conn->protocol >= PROTOCOL_SMB3_10) {
5412                 struct _derivation *d;
5413                 DATA_BLOB p;
5414
5415                 p = data_blob_const(session->smb2_channel.preauth_sha512,
5416                                 sizeof(session->smb2_channel.preauth_sha512));
5417
5418                 d = &derivation.signing;
5419                 d->label = data_blob_string_const_null("SMBSigningKey");
5420                 d->context = p;
5421
5422                 d = &derivation.encryption;
5423                 d->label = data_blob_string_const_null("SMBC2SCipherKey");
5424                 d->context = p;
5425
5426                 d = &derivation.decryption;
5427                 d->label = data_blob_string_const_null("SMBS2CCipherKey");
5428                 d->context = p;
5429
5430                 d = &derivation.application;
5431                 d->label = data_blob_string_const_null("SMBAppKey");
5432                 d->context = p;
5433
5434         } else if (conn->protocol >= PROTOCOL_SMB2_24) {
5435                 struct _derivation *d;
5436
5437                 d = &derivation.signing;
5438                 d->label = data_blob_string_const_null("SMB2AESCMAC");
5439                 d->context = data_blob_string_const_null("SmbSign");
5440
5441                 d = &derivation.encryption;
5442                 d->label = data_blob_string_const_null("SMB2AESCCM");
5443                 d->context = data_blob_string_const_null("ServerIn ");
5444
5445                 d = &derivation.decryption;
5446                 d->label = data_blob_string_const_null("SMB2AESCCM");
5447                 d->context = data_blob_string_const_null("ServerOut");
5448
5449                 d = &derivation.application;
5450                 d->label = data_blob_string_const_null("SMB2APP");
5451                 d->context = data_blob_string_const_null("SmbRpc");
5452         }
5453
5454         ZERO_STRUCT(session_key);
5455         memcpy(session_key, _session_key.data,
5456                MIN(_session_key.length, sizeof(session_key)));
5457
5458         session->smb2->signing_key = data_blob_talloc(session,
5459                                                      session_key,
5460                                                      sizeof(session_key));
5461         if (session->smb2->signing_key.data == NULL) {
5462                 ZERO_STRUCT(session_key);
5463                 return NT_STATUS_NO_MEMORY;
5464         }
5465
5466         if (conn->protocol >= PROTOCOL_SMB2_24) {
5467                 struct _derivation *d = &derivation.signing;
5468
5469                 smb2_key_derivation(session_key, sizeof(session_key),
5470                                     d->label.data, d->label.length,
5471                                     d->context.data, d->context.length,
5472                                     session->smb2->signing_key.data);
5473         }
5474
5475         session->smb2->encryption_key = data_blob_dup_talloc(session,
5476                                                 session->smb2->signing_key);
5477         if (session->smb2->encryption_key.data == NULL) {
5478                 ZERO_STRUCT(session_key);
5479                 return NT_STATUS_NO_MEMORY;
5480         }
5481
5482         if (conn->protocol >= PROTOCOL_SMB2_24) {
5483                 struct _derivation *d = &derivation.encryption;
5484
5485                 smb2_key_derivation(session_key, sizeof(session_key),
5486                                     d->label.data, d->label.length,
5487                                     d->context.data, d->context.length,
5488                                     session->smb2->encryption_key.data);
5489         }
5490
5491         session->smb2->decryption_key = data_blob_dup_talloc(session,
5492                                                 session->smb2->signing_key);
5493         if (session->smb2->decryption_key.data == NULL) {
5494                 ZERO_STRUCT(session_key);
5495                 return NT_STATUS_NO_MEMORY;
5496         }
5497
5498         if (conn->protocol >= PROTOCOL_SMB2_24) {
5499                 struct _derivation *d = &derivation.decryption;
5500
5501                 smb2_key_derivation(session_key, sizeof(session_key),
5502                                     d->label.data, d->label.length,
5503                                     d->context.data, d->context.length,
5504                                     session->smb2->decryption_key.data);
5505         }
5506
5507         session->smb2->application_key = data_blob_dup_talloc(session,
5508                                                 session->smb2->signing_key);
5509         if (session->smb2->application_key.data == NULL) {
5510                 ZERO_STRUCT(session_key);
5511                 return NT_STATUS_NO_MEMORY;
5512         }
5513
5514         if (conn->protocol >= PROTOCOL_SMB2_24) {
5515                 struct _derivation *d = &derivation.application;
5516
5517                 smb2_key_derivation(session_key, sizeof(session_key),
5518                                     d->label.data, d->label.length,
5519                                     d->context.data, d->context.length,
5520                                     session->smb2->application_key.data);
5521         }
5522         ZERO_STRUCT(session_key);
5523
5524         session->smb2_channel.signing_key = data_blob_dup_talloc(session,
5525                                                 session->smb2->signing_key);
5526         if (session->smb2_channel.signing_key.data == NULL) {
5527                 return NT_STATUS_NO_MEMORY;
5528         }
5529
5530         check_signature = conn->mandatory_signing;
5531
5532         hdr_flags = IVAL(recv_iov[0].iov_base, SMB2_HDR_FLAGS);
5533         if (hdr_flags & SMB2_HDR_FLAG_SIGNED) {
5534                 /*
5535                  * Sadly some vendors don't sign the
5536                  * final SMB2 session setup response
5537                  *
5538                  * At least Windows and Samba are always doing this
5539                  * if there's a session key available.
5540                  *
5541                  * We only check the signature if it's mandatory
5542                  * or SMB2_HDR_FLAG_SIGNED is provided.
5543                  */
5544                 check_signature = true;
5545         }
5546
5547         if (conn->protocol >= PROTOCOL_SMB3_10) {
5548                 check_signature = true;
5549         }
5550
5551         if (check_signature) {
5552                 status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
5553                                                 session->conn->protocol,
5554                                                 recv_iov, 3);
5555                 if (!NT_STATUS_IS_OK(status)) {
5556                         return status;
5557                 }
5558         }
5559
5560         session->smb2->should_sign = false;
5561         session->smb2->should_encrypt = false;
5562
5563         if (conn->desire_signing) {
5564                 session->smb2->should_sign = true;
5565         }
5566
5567         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
5568                 session->smb2->should_sign = true;
5569         }
5570
5571         if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
5572                 session->smb2->should_encrypt = true;
5573         }
5574
5575         if (conn->protocol < PROTOCOL_SMB2_24) {
5576                 session->smb2->should_encrypt = false;
5577         }
5578
5579         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
5580                 session->smb2->should_encrypt = false;
5581         }
5582
5583         generate_random_buffer((uint8_t *)&session->smb2->nonce_high,
5584                                sizeof(session->smb2->nonce_high));
5585         session->smb2->nonce_low = 1;
5586
5587         return NT_STATUS_OK;
5588 }
5589
5590 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
5591                                         struct smbXcli_session *session1,
5592                                         struct smbXcli_conn *conn,
5593                                         struct smbXcli_session **_session2)
5594 {
5595         struct smbXcli_session *session2;
5596
5597         if (session1->smb2->signing_key.length == 0) {
5598                 return NT_STATUS_INVALID_PARAMETER_MIX;
5599         }
5600
5601         if (conn == NULL) {
5602                 return NT_STATUS_INVALID_PARAMETER_MIX;
5603         }
5604
5605         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
5606         if (session2 == NULL) {
5607                 return NT_STATUS_NO_MEMORY;
5608         }
5609         session2->smb2 = talloc_reference(session2, session1->smb2);
5610         if (session2->smb2 == NULL) {
5611                 talloc_free(session2);
5612                 return NT_STATUS_NO_MEMORY;
5613         }
5614
5615         talloc_set_destructor(session2, smbXcli_session_destructor);
5616         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
5617         session2->conn = conn;
5618
5619         memcpy(session2->smb2_channel.preauth_sha512,
5620                conn->smb2.preauth_sha512,
5621                sizeof(session2->smb2_channel.preauth_sha512));
5622
5623         *_session2 = session2;
5624         return NT_STATUS_OK;
5625 }
5626
5627 NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
5628                                          const DATA_BLOB _channel_key,
5629                                          const struct iovec *recv_iov)
5630 {
5631         struct smbXcli_conn *conn = session->conn;
5632         uint8_t channel_key[16];
5633         NTSTATUS status;
5634         struct _derivation {
5635                 DATA_BLOB label;
5636                 DATA_BLOB context;
5637         };
5638         struct {
5639                 struct _derivation signing;
5640         } derivation = { };
5641
5642         if (conn == NULL) {
5643                 return NT_STATUS_INVALID_PARAMETER_MIX;
5644         }
5645
5646         if (session->smb2_channel.signing_key.length != 0) {
5647                 return NT_STATUS_INVALID_PARAMETER_MIX;
5648         }
5649
5650         if (conn->protocol >= PROTOCOL_SMB3_10) {
5651                 struct _derivation *d;
5652                 DATA_BLOB p;
5653
5654                 p = data_blob_const(session->smb2_channel.preauth_sha512,
5655                                 sizeof(session->smb2_channel.preauth_sha512));
5656
5657                 d = &derivation.signing;
5658                 d->label = data_blob_string_const_null("SMBSigningKey");
5659                 d->context = p;
5660         } else if (conn->protocol >= PROTOCOL_SMB2_24) {
5661                 struct _derivation *d;
5662
5663                 d = &derivation.signing;
5664                 d->label = data_blob_string_const_null("SMB2AESCMAC");
5665                 d->context = data_blob_string_const_null("SmbSign");
5666         }
5667
5668         ZERO_STRUCT(channel_key);
5669         memcpy(channel_key, _channel_key.data,
5670                MIN(_channel_key.length, sizeof(channel_key)));
5671
5672         session->smb2_channel.signing_key = data_blob_talloc(session,
5673                                                 channel_key,
5674                                                 sizeof(channel_key));
5675         if (session->smb2_channel.signing_key.data == NULL) {
5676                 ZERO_STRUCT(channel_key);
5677                 return NT_STATUS_NO_MEMORY;
5678         }
5679
5680         if (conn->protocol >= PROTOCOL_SMB2_24) {
5681                 struct _derivation *d = &derivation.signing;
5682
5683                 smb2_key_derivation(channel_key, sizeof(channel_key),
5684                                     d->label.data, d->label.length,
5685                                     d->context.data, d->context.length,
5686                                     session->smb2_channel.signing_key.data);
5687         }
5688         ZERO_STRUCT(channel_key);
5689
5690         status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
5691                                         session->conn->protocol,
5692                                         recv_iov, 3);
5693         if (!NT_STATUS_IS_OK(status)) {
5694                 return status;
5695         }
5696
5697         return NT_STATUS_OK;
5698 }
5699
5700 NTSTATUS smb2cli_session_encryption_on(struct smbXcli_session *session)
5701 {
5702         if (session->smb2->should_encrypt) {
5703                 return NT_STATUS_OK;
5704         }
5705
5706         if (session->conn->protocol < PROTOCOL_SMB2_24) {
5707                 return NT_STATUS_NOT_SUPPORTED;
5708         }
5709
5710         if (!(session->conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
5711                 return NT_STATUS_NOT_SUPPORTED;
5712         }
5713
5714         if (session->smb2->signing_key.data == NULL) {
5715                 return NT_STATUS_NOT_SUPPORTED;
5716         }
5717         session->smb2->should_encrypt = true;
5718         return NT_STATUS_OK;
5719 }
5720
5721 struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx)
5722 {
5723         struct smbXcli_tcon *tcon;
5724
5725         tcon = talloc_zero(mem_ctx, struct smbXcli_tcon);
5726         if (tcon == NULL) {
5727                 return NULL;
5728         }
5729
5730         return tcon;
5731 }
5732
5733 void smbXcli_tcon_set_fs_attributes(struct smbXcli_tcon *tcon,
5734                                     uint32_t fs_attributes)
5735 {
5736         tcon->fs_attributes = fs_attributes;
5737 }
5738
5739 uint32_t smbXcli_tcon_get_fs_attributes(struct smbXcli_tcon *tcon)
5740 {
5741         return tcon->fs_attributes;
5742 }
5743
5744 bool smbXcli_tcon_is_dfs_share(struct smbXcli_tcon *tcon)
5745 {
5746         if (tcon == NULL) {
5747                 return false;
5748         }
5749
5750         if (tcon->is_smb1) {
5751                 if (tcon->smb1.optional_support & SMB_SHARE_IN_DFS) {
5752                         return true;
5753                 }
5754
5755                 return false;
5756         }
5757
5758         if (tcon->smb2.capabilities & SMB2_SHARE_CAP_DFS) {
5759                 return true;
5760         }
5761
5762         return false;
5763 }
5764
5765 uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon)
5766 {
5767         return tcon->smb1.tcon_id;
5768 }
5769
5770 void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id)
5771 {
5772         tcon->is_smb1 = true;
5773         tcon->smb1.tcon_id = tcon_id;
5774 }
5775
5776 bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon,
5777                              uint16_t tcon_id,
5778                              uint16_t optional_support,
5779                              uint32_t maximal_access,
5780                              uint32_t guest_maximal_access,
5781                              const char *service,
5782                              const char *fs_type)
5783 {
5784         tcon->is_smb1 = true;
5785         tcon->fs_attributes = 0;
5786         tcon->smb1.tcon_id = tcon_id;
5787         tcon->smb1.optional_support = optional_support;
5788         tcon->smb1.maximal_access = maximal_access;
5789         tcon->smb1.guest_maximal_access = guest_maximal_access;
5790
5791         TALLOC_FREE(tcon->smb1.service);
5792         tcon->smb1.service = talloc_strdup(tcon, service);
5793         if (service != NULL && tcon->smb1.service == NULL) {
5794                 return false;
5795         }
5796
5797         TALLOC_FREE(tcon->smb1.fs_type);
5798         tcon->smb1.fs_type = talloc_strdup(tcon, fs_type);
5799         if (fs_type != NULL && tcon->smb1.fs_type == NULL) {
5800                 return false;
5801         }
5802
5803         return true;
5804 }
5805
5806 uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon)
5807 {
5808         return tcon->smb2.tcon_id;
5809 }
5810
5811 uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon)
5812 {
5813         return tcon->smb2.capabilities;
5814 }
5815
5816 void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon,
5817                              struct smbXcli_session *session,
5818                              uint32_t tcon_id,
5819                              uint8_t type,
5820                              uint32_t flags,
5821                              uint32_t capabilities,
5822                              uint32_t maximal_access)
5823 {
5824         tcon->is_smb1 = false;
5825         tcon->fs_attributes = 0;
5826         tcon->smb2.tcon_id = tcon_id;
5827         tcon->smb2.type = type;
5828         tcon->smb2.flags = flags;
5829         tcon->smb2.capabilities = capabilities;
5830         tcon->smb2.maximal_access = maximal_access;
5831
5832         tcon->smb2.should_sign = false;
5833         tcon->smb2.should_encrypt = false;
5834
5835         if (session == NULL) {
5836                 return;
5837         }
5838
5839         tcon->smb2.should_sign = session->smb2->should_sign;
5840         tcon->smb2.should_encrypt = session->smb2->should_encrypt;
5841
5842         if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) {
5843                 tcon->smb2.should_encrypt = true;
5844         }
5845 }
5846
5847 void smb2cli_tcon_should_sign(struct smbXcli_tcon *tcon,
5848                               bool should_sign)
5849 {
5850         tcon->smb2.should_sign = should_sign;
5851 }
5852
5853 bool smb2cli_tcon_is_signing_on(struct smbXcli_tcon *tcon)
5854 {
5855         if (tcon->smb2.should_encrypt) {
5856                 return true;
5857         }
5858
5859         return tcon->smb2.should_sign;
5860 }
5861
5862 void smb2cli_tcon_should_encrypt(struct smbXcli_tcon *tcon,
5863                                  bool should_encrypt)
5864 {
5865         tcon->smb2.should_encrypt = should_encrypt;
5866 }
5867
5868 bool smb2cli_tcon_is_encryption_on(struct smbXcli_tcon *tcon)
5869 {
5870         return tcon->smb2.should_encrypt;
5871 }