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