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