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                 smbXcli_conn_disconnect(conn, NT_STATUS_INTERNAL_ERROR);
1566                 TALLOC_FREE(frame);
1567                 return;
1568         }
1569         conn->read_smb_req = NULL;
1570
1571         received = read_smb_recv(subreq, frame, &inbuf, &err);
1572         TALLOC_FREE(subreq);
1573         if (received == -1) {
1574                 status = map_nt_error_from_unix_common(err);
1575                 smbXcli_conn_disconnect(conn, status);
1576                 TALLOC_FREE(frame);
1577                 return;
1578         }
1579
1580         status = conn->dispatch_incoming(conn, frame, inbuf);
1581         TALLOC_FREE(frame);
1582         if (NT_STATUS_IS_OK(status)) {
1583                 /*
1584                  * We should not do any more processing
1585                  * as the dispatch function called
1586                  * tevent_req_done().
1587                  */
1588                 return;
1589         }
1590
1591         if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1592                 /*
1593                  * We got an error, so notify all pending requests
1594                  */
1595                 smbXcli_conn_disconnect(conn, status);
1596                 return;
1597         }
1598
1599         /*
1600          * We got NT_STATUS_RETRY, so we may ask for a
1601          * next incoming pdu.
1602          */
1603         if (!smbXcli_conn_receive_next(conn)) {
1604                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1605         }
1606 }
1607
1608 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1609                                           struct iovec **piov, int *pnum_iov)
1610 {
1611         struct iovec *iov;
1612         int num_iov;
1613         size_t buflen;
1614         size_t taken;
1615         size_t remaining;
1616         uint8_t *hdr;
1617         uint8_t cmd;
1618         uint32_t wct_ofs;
1619         NTSTATUS status;
1620         size_t min_size = MIN_SMB_SIZE;
1621
1622         buflen = smb_len_tcp(buf);
1623         taken = 0;
1624
1625         hdr = buf + NBT_HDR_SIZE;
1626
1627         status = smb1cli_pull_raw_error(hdr);
1628         if (NT_STATUS_IS_ERR(status)) {
1629                 /*
1630                  * This is an ugly hack to support OS/2
1631                  * which skips the byte_count in the DATA block
1632                  * on some error responses.
1633                  *
1634                  * See bug #9096
1635                  */
1636                 min_size -= sizeof(uint16_t);
1637         }
1638
1639         if (buflen < min_size) {
1640                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1641         }
1642
1643         /*
1644          * This returns iovec elements in the following order:
1645          *
1646          * - SMB header
1647          *
1648          * - Parameter Block
1649          * - Data Block
1650          *
1651          * - Parameter Block
1652          * - Data Block
1653          *
1654          * - Parameter Block
1655          * - Data Block
1656          */
1657         num_iov = 1;
1658
1659         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1660         if (iov == NULL) {
1661                 return NT_STATUS_NO_MEMORY;
1662         }
1663         iov[0].iov_base = hdr;
1664         iov[0].iov_len = HDR_WCT;
1665         taken += HDR_WCT;
1666
1667         cmd = CVAL(hdr, HDR_COM);
1668         wct_ofs = HDR_WCT;
1669
1670         while (true) {
1671                 size_t len = buflen - taken;
1672                 struct iovec *cur;
1673                 struct iovec *iov_tmp;
1674                 uint8_t wct;
1675                 uint32_t bcc_ofs;
1676                 uint16_t bcc;
1677                 size_t needed;
1678
1679                 /*
1680                  * we need at least WCT
1681                  */
1682                 needed = sizeof(uint8_t);
1683                 if (len < needed) {
1684                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1685                                    __location__, (int)len, (int)needed));
1686                         goto inval;
1687                 }
1688
1689                 /*
1690                  * Now we check if the specified words are there
1691                  */
1692                 wct = CVAL(hdr, wct_ofs);
1693                 needed += wct * sizeof(uint16_t);
1694                 if (len < needed) {
1695                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1696                                    __location__, (int)len, (int)needed));
1697                         goto inval;
1698                 }
1699
1700                 if ((num_iov == 1) &&
1701                     (len == needed) &&
1702                     NT_STATUS_IS_ERR(status))
1703                 {
1704                         /*
1705                          * This is an ugly hack to support OS/2
1706                          * which skips the byte_count in the DATA block
1707                          * on some error responses.
1708                          *
1709                          * See bug #9096
1710                          */
1711                         iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1712                                                  num_iov + 2);
1713                         if (iov_tmp == NULL) {
1714                                 TALLOC_FREE(iov);
1715                                 return NT_STATUS_NO_MEMORY;
1716                         }
1717                         iov = iov_tmp;
1718                         cur = &iov[num_iov];
1719                         num_iov += 2;
1720
1721                         cur[0].iov_len = 0;
1722                         cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1723                         cur[1].iov_len = 0;
1724                         cur[1].iov_base = cur[0].iov_base;
1725
1726                         taken += needed;
1727                         break;
1728                 }
1729
1730                 /*
1731                  * we need at least BCC
1732                  */
1733                 needed += sizeof(uint16_t);
1734                 if (len < needed) {
1735                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1736                                    __location__, (int)len, (int)needed));
1737                         goto inval;
1738                 }
1739
1740                 /*
1741                  * Now we check if the specified bytes are there
1742                  */
1743                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1744                 bcc = SVAL(hdr, bcc_ofs);
1745                 needed += bcc * sizeof(uint8_t);
1746                 if (len < needed) {
1747                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1748                                    __location__, (int)len, (int)needed));
1749                         goto inval;
1750                 }
1751
1752                 /*
1753                  * we allocate 2 iovec structures for words and bytes
1754                  */
1755                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1756                                          num_iov + 2);
1757                 if (iov_tmp == NULL) {
1758                         TALLOC_FREE(iov);
1759                         return NT_STATUS_NO_MEMORY;
1760                 }
1761                 iov = iov_tmp;
1762                 cur = &iov[num_iov];
1763                 num_iov += 2;
1764
1765                 cur[0].iov_len = wct * sizeof(uint16_t);
1766                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1767                 cur[1].iov_len = bcc * sizeof(uint8_t);
1768                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1769
1770                 taken += needed;
1771
1772                 if (!smb1cli_is_andx_req(cmd)) {
1773                         /*
1774                          * If the current command does not have AndX chanining
1775                          * we are done.
1776                          */
1777                         break;
1778                 }
1779
1780                 if (wct == 0 && bcc == 0) {
1781                         /*
1782                          * An empty response also ends the chain,
1783                          * most likely with an error.
1784                          */
1785                         break;
1786                 }
1787
1788                 if (wct < 2) {
1789                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1790                                    __location__, (int)wct, (int)cmd));
1791                         goto inval;
1792                 }
1793                 cmd = CVAL(cur[0].iov_base, 0);
1794                 if (cmd == 0xFF) {
1795                         /*
1796                          * If it is the end of the chain we are also done.
1797                          */
1798                         break;
1799                 }
1800                 wct_ofs = SVAL(cur[0].iov_base, 2);
1801
1802                 if (wct_ofs < taken) {
1803                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1804                 }
1805                 if (wct_ofs > buflen) {
1806                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1807                 }
1808
1809                 /*
1810                  * we consumed everything up to the start of the next
1811                  * parameter block.
1812                  */
1813                 taken = wct_ofs;
1814         }
1815
1816         remaining = buflen - taken;
1817
1818         if (remaining > 0 && num_iov >= 3) {
1819                 /*
1820                  * The last DATA block gets the remaining
1821                  * bytes, this is needed to support
1822                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1823                  */
1824                 iov[num_iov-1].iov_len += remaining;
1825         }
1826
1827         *piov = iov;
1828         *pnum_iov = num_iov;
1829         return NT_STATUS_OK;
1830
1831 inval:
1832         TALLOC_FREE(iov);
1833         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1834 }
1835
1836 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1837                                                TALLOC_CTX *tmp_mem,
1838                                                uint8_t *inbuf)
1839 {
1840         struct tevent_req *req;
1841         struct smbXcli_req_state *state;
1842         NTSTATUS status;
1843         size_t num_pending;
1844         size_t i;
1845         uint8_t cmd;
1846         uint16_t mid;
1847         bool oplock_break;
1848         uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1849         size_t len = smb_len_tcp(inbuf);
1850         struct iovec *iov = NULL;
1851         int num_iov = 0;
1852         struct tevent_req **chain = NULL;
1853         size_t num_chained = 0;
1854         size_t num_responses = 0;
1855
1856         if (conn->smb1.read_braw_req != NULL) {
1857                 req = conn->smb1.read_braw_req;
1858                 conn->smb1.read_braw_req = NULL;
1859                 state = tevent_req_data(req, struct smbXcli_req_state);
1860
1861                 smbXcli_req_unset_pending(req);
1862
1863                 if (state->smb1.recv_iov == NULL) {
1864                         /*
1865                          * For requests with more than
1866                          * one response, we have to readd the
1867                          * recv_iov array.
1868                          */
1869                         state->smb1.recv_iov = talloc_zero_array(state,
1870                                                                  struct iovec,
1871                                                                  3);
1872                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1873                                 return NT_STATUS_OK;
1874                         }
1875                 }
1876
1877                 state->smb1.recv_iov[0].iov_base = (void *)(inhdr);
1878                 state->smb1.recv_iov[0].iov_len = len;
1879                 ZERO_STRUCT(state->smb1.recv_iov[1]);
1880                 ZERO_STRUCT(state->smb1.recv_iov[2]);
1881
1882                 state->smb1.recv_cmd = SMBreadBraw;
1883                 state->smb1.recv_status = NT_STATUS_OK;
1884                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1885
1886                 tevent_req_done(req);
1887                 return NT_STATUS_OK;
1888         }
1889
1890         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1891             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1892                 DEBUG(10, ("Got non-SMB PDU\n"));
1893                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1894         }
1895
1896         /*
1897          * If we supported multiple encrytion contexts
1898          * here we'd look up based on tid.
1899          */
1900         if (common_encryption_on(conn->smb1.trans_enc)
1901             && (CVAL(inbuf, 0) == 0)) {
1902                 uint16_t enc_ctx_num;
1903
1904                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1905                 if (!NT_STATUS_IS_OK(status)) {
1906                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1907                                    nt_errstr(status)));
1908                         return status;
1909                 }
1910
1911                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1912                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1913                                    enc_ctx_num,
1914                                    conn->smb1.trans_enc->enc_ctx_num));
1915                         return NT_STATUS_INVALID_HANDLE;
1916                 }
1917
1918                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1919                                                (char *)inbuf);
1920                 if (!NT_STATUS_IS_OK(status)) {
1921                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1922                                    nt_errstr(status)));
1923                         return status;
1924                 }
1925                 inhdr = inbuf + NBT_HDR_SIZE;
1926                 len = smb_len_nbt(inbuf);
1927         }
1928
1929         mid = SVAL(inhdr, HDR_MID);
1930         num_pending = talloc_array_length(conn->pending);
1931
1932         for (i=0; i<num_pending; i++) {
1933                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1934                         break;
1935                 }
1936         }
1937         if (i == num_pending) {
1938                 /* Dump unexpected reply */
1939                 return NT_STATUS_RETRY;
1940         }
1941
1942         oplock_break = false;
1943
1944         if (mid == 0xffff) {
1945                 /*
1946                  * Paranoia checks that this is really an oplock break request.
1947                  */
1948                 oplock_break = (len == 51); /* hdr + 8 words */
1949                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1950                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1951                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1952                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1953
1954                 if (!oplock_break) {
1955                         /* Dump unexpected reply */
1956                         return NT_STATUS_RETRY;
1957                 }
1958         }
1959
1960         req = conn->pending[i];
1961         state = tevent_req_data(req, struct smbXcli_req_state);
1962
1963         if (!oplock_break /* oplock breaks are not signed */
1964             && !smb_signing_check_pdu(conn->smb1.signing,
1965                                       inhdr, len, state->smb1.seqnum+1)) {
1966                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1967                 return NT_STATUS_ACCESS_DENIED;
1968         }
1969
1970         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
1971                                            &iov, &num_iov);
1972         if (!NT_STATUS_IS_OK(status)) {
1973                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
1974                           nt_errstr(status)));
1975                 return status;
1976         }
1977
1978         cmd = CVAL(inhdr, HDR_COM);
1979         status = smb1cli_pull_raw_error(inhdr);
1980
1981         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
1982             (state->session != NULL) && state->session->disconnect_expired)
1983         {
1984                 /*
1985                  * this should be a short term hack
1986                  * until the upper layers have implemented
1987                  * re-authentication.
1988                  */
1989                 return status;
1990         }
1991
1992         if (state->smb1.chained_requests == NULL) {
1993                 if (num_iov != 3) {
1994                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1995                 }
1996
1997                 smbXcli_req_unset_pending(req);
1998
1999                 if (state->smb1.recv_iov == NULL) {
2000                         /*
2001                          * For requests with more than
2002                          * one response, we have to readd the
2003                          * recv_iov array.
2004                          */
2005                         state->smb1.recv_iov = talloc_zero_array(state,
2006                                                                  struct iovec,
2007                                                                  3);
2008                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2009                                 return NT_STATUS_OK;
2010                         }
2011                 }
2012
2013                 state->smb1.recv_cmd = cmd;
2014                 state->smb1.recv_status = status;
2015                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
2016
2017                 state->smb1.recv_iov[0] = iov[0];
2018                 state->smb1.recv_iov[1] = iov[1];
2019                 state->smb1.recv_iov[2] = iov[2];
2020
2021                 if (talloc_array_length(conn->pending) == 0) {
2022                         tevent_req_done(req);
2023                         return NT_STATUS_OK;
2024                 }
2025
2026                 tevent_req_defer_callback(req, state->ev);
2027                 tevent_req_done(req);
2028                 return NT_STATUS_RETRY;
2029         }
2030
2031         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
2032         num_chained = talloc_array_length(chain);
2033         num_responses = (num_iov - 1)/2;
2034
2035         if (num_responses > num_chained) {
2036                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2037         }
2038
2039         for (i=0; i<num_chained; i++) {
2040                 size_t iov_idx = 1 + (i*2);
2041                 struct iovec *cur = &iov[iov_idx];
2042                 uint8_t *inbuf_ref;
2043
2044                 req = chain[i];
2045                 state = tevent_req_data(req, struct smbXcli_req_state);
2046
2047                 smbXcli_req_unset_pending(req);
2048
2049                 /*
2050                  * as we finish multiple requests here
2051                  * we need to defer the callbacks as
2052                  * they could destroy our current stack state.
2053                  */
2054                 tevent_req_defer_callback(req, state->ev);
2055
2056                 if (i >= num_responses) {
2057                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
2058                         continue;
2059                 }
2060
2061                 if (state->smb1.recv_iov == NULL) {
2062                         /*
2063                          * For requests with more than
2064                          * one response, we have to readd the
2065                          * recv_iov array.
2066                          */
2067                         state->smb1.recv_iov = talloc_zero_array(state,
2068                                                                  struct iovec,
2069                                                                  3);
2070                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
2071                                 continue;
2072                         }
2073                 }
2074
2075                 state->smb1.recv_cmd = cmd;
2076
2077                 if (i == (num_responses - 1)) {
2078                         /*
2079                          * The last request in the chain gets the status
2080                          */
2081                         state->smb1.recv_status = status;
2082                 } else {
2083                         cmd = CVAL(cur[0].iov_base, 0);
2084                         state->smb1.recv_status = NT_STATUS_OK;
2085                 }
2086
2087                 state->inbuf = inbuf;
2088
2089                 /*
2090                  * Note: here we use talloc_reference() in a way
2091                  *       that does not expose it to the caller.
2092                  */
2093                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
2094                 if (tevent_req_nomem(inbuf_ref, req)) {
2095                         continue;
2096                 }
2097
2098                 /* copy the related buffers */
2099                 state->smb1.recv_iov[0] = iov[0];
2100                 state->smb1.recv_iov[1] = cur[0];
2101                 state->smb1.recv_iov[2] = cur[1];
2102
2103                 tevent_req_done(req);
2104         }
2105
2106         return NT_STATUS_RETRY;
2107 }
2108
2109 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
2110                           TALLOC_CTX *mem_ctx,
2111                           struct iovec **piov,
2112                           uint8_t **phdr,
2113                           uint8_t *pwct,
2114                           uint16_t **pvwv,
2115                           uint32_t *pvwv_offset,
2116                           uint32_t *pnum_bytes,
2117                           uint8_t **pbytes,
2118                           uint32_t *pbytes_offset,
2119                           uint8_t **pinbuf,
2120                           const struct smb1cli_req_expected_response *expected,
2121                           size_t num_expected)
2122 {
2123         struct smbXcli_req_state *state =
2124                 tevent_req_data(req,
2125                 struct smbXcli_req_state);
2126         NTSTATUS status = NT_STATUS_OK;
2127         struct iovec *recv_iov = NULL;
2128         uint8_t *hdr = NULL;
2129         uint8_t wct = 0;
2130         uint32_t vwv_offset = 0;
2131         uint16_t *vwv = NULL;
2132         uint32_t num_bytes = 0;
2133         uint32_t bytes_offset = 0;
2134         uint8_t *bytes = NULL;
2135         size_t i;
2136         bool found_status = false;
2137         bool found_size = false;
2138
2139         if (piov != NULL) {
2140                 *piov = NULL;
2141         }
2142         if (phdr != NULL) {
2143                 *phdr = 0;
2144         }
2145         if (pwct != NULL) {
2146                 *pwct = 0;
2147         }
2148         if (pvwv != NULL) {
2149                 *pvwv = NULL;
2150         }
2151         if (pvwv_offset != NULL) {
2152                 *pvwv_offset = 0;
2153         }
2154         if (pnum_bytes != NULL) {
2155                 *pnum_bytes = 0;
2156         }
2157         if (pbytes != NULL) {
2158                 *pbytes = NULL;
2159         }
2160         if (pbytes_offset != NULL) {
2161                 *pbytes_offset = 0;
2162         }
2163         if (pinbuf != NULL) {
2164                 *pinbuf = NULL;
2165         }
2166
2167         if (state->inbuf != NULL) {
2168                 recv_iov = state->smb1.recv_iov;
2169                 state->smb1.recv_iov = NULL;
2170                 if (state->smb1.recv_cmd != SMBreadBraw) {
2171                         hdr = (uint8_t *)recv_iov[0].iov_base;
2172                         wct = recv_iov[1].iov_len/2;
2173                         vwv = (uint16_t *)recv_iov[1].iov_base;
2174                         vwv_offset = PTR_DIFF(vwv, hdr);
2175                         num_bytes = recv_iov[2].iov_len;
2176                         bytes = (uint8_t *)recv_iov[2].iov_base;
2177                         bytes_offset = PTR_DIFF(bytes, hdr);
2178                 }
2179         }
2180
2181         if (tevent_req_is_nterror(req, &status)) {
2182                 for (i=0; i < num_expected; i++) {
2183                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2184                                 found_status = true;
2185                                 break;
2186                         }
2187                 }
2188
2189                 if (found_status) {
2190                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2191                 }
2192
2193                 return status;
2194         }
2195
2196         if (num_expected == 0) {
2197                 found_status = true;
2198                 found_size = true;
2199         }
2200
2201         status = state->smb1.recv_status;
2202
2203         for (i=0; i < num_expected; i++) {
2204                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2205                         continue;
2206                 }
2207
2208                 found_status = true;
2209                 if (expected[i].wct == 0) {
2210                         found_size = true;
2211                         break;
2212                 }
2213
2214                 if (expected[i].wct == wct) {
2215                         found_size = true;
2216                         break;
2217                 }
2218         }
2219
2220         if (!found_status) {
2221                 return status;
2222         }
2223
2224         if (!found_size) {
2225                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2226         }
2227
2228         if (piov != NULL) {
2229                 *piov = talloc_move(mem_ctx, &recv_iov);
2230         }
2231
2232         if (phdr != NULL) {
2233                 *phdr = hdr;
2234         }
2235         if (pwct != NULL) {
2236                 *pwct = wct;
2237         }
2238         if (pvwv != NULL) {
2239                 *pvwv = vwv;
2240         }
2241         if (pvwv_offset != NULL) {
2242                 *pvwv_offset = vwv_offset;
2243         }
2244         if (pnum_bytes != NULL) {
2245                 *pnum_bytes = num_bytes;
2246         }
2247         if (pbytes != NULL) {
2248                 *pbytes = bytes;
2249         }
2250         if (pbytes_offset != NULL) {
2251                 *pbytes_offset = bytes_offset;
2252         }
2253         if (pinbuf != NULL) {
2254                 *pinbuf = state->inbuf;
2255         }
2256
2257         return status;
2258 }
2259
2260 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2261 {
2262         size_t wct_ofs;
2263         int i;
2264
2265         wct_ofs = HDR_WCT;
2266
2267         for (i=0; i<num_reqs; i++) {
2268                 struct smbXcli_req_state *state;
2269                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2270                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2271                                            state->smb1.iov_count-2);
2272                 wct_ofs = (wct_ofs + 3) & ~3;
2273         }
2274         return wct_ofs;
2275 }
2276
2277 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2278 {
2279         struct smbXcli_req_state *first_state =
2280                 tevent_req_data(reqs[0],
2281                 struct smbXcli_req_state);
2282         struct smbXcli_req_state *state;
2283         size_t wct_offset;
2284         size_t chain_padding = 0;
2285         int i, iovlen;
2286         struct iovec *iov = NULL;
2287         struct iovec *this_iov;
2288         NTSTATUS status;
2289         size_t nbt_len;
2290
2291         if (num_reqs == 1) {
2292                 return smb1cli_req_writev_submit(reqs[0], first_state,
2293                                                  first_state->smb1.iov,
2294                                                  first_state->smb1.iov_count);
2295         }
2296
2297         iovlen = 0;
2298         for (i=0; i<num_reqs; i++) {
2299                 if (!tevent_req_is_in_progress(reqs[i])) {
2300                         return NT_STATUS_INTERNAL_ERROR;
2301                 }
2302
2303                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2304
2305                 if (state->smb1.iov_count < 4) {
2306                         return NT_STATUS_INVALID_PARAMETER_MIX;
2307                 }
2308
2309                 if (i == 0) {
2310                         /*
2311                          * The NBT and SMB header
2312                          */
2313                         iovlen += 2;
2314                 } else {
2315                         /*
2316                          * Chain padding
2317                          */
2318                         iovlen += 1;
2319                 }
2320
2321                 /*
2322                  * words and bytes
2323                  */
2324                 iovlen += state->smb1.iov_count - 2;
2325         }
2326
2327         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2328         if (iov == NULL) {
2329                 return NT_STATUS_NO_MEMORY;
2330         }
2331
2332         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2333                 first_state, reqs, sizeof(*reqs) * num_reqs);
2334         if (first_state->smb1.chained_requests == NULL) {
2335                 TALLOC_FREE(iov);
2336                 return NT_STATUS_NO_MEMORY;
2337         }
2338
2339         wct_offset = HDR_WCT;
2340         this_iov = iov;
2341
2342         for (i=0; i<num_reqs; i++) {
2343                 size_t next_padding = 0;
2344                 uint16_t *vwv;
2345
2346                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2347
2348                 if (i < num_reqs-1) {
2349                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2350                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2351                                 TALLOC_FREE(iov);
2352                                 TALLOC_FREE(first_state->smb1.chained_requests);
2353                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2354                         }
2355                 }
2356
2357                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2358                                               state->smb1.iov_count-2) + 1;
2359                 if ((wct_offset % 4) != 0) {
2360                         next_padding = 4 - (wct_offset % 4);
2361                 }
2362                 wct_offset += next_padding;
2363                 vwv = state->smb1.vwv;
2364
2365                 if (i < num_reqs-1) {
2366                         struct smbXcli_req_state *next_state =
2367                                 tevent_req_data(reqs[i+1],
2368                                 struct smbXcli_req_state);
2369                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2370                         SCVAL(vwv+0, 1, 0);
2371                         SSVAL(vwv+1, 0, wct_offset);
2372                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2373                         /* properly end the chain */
2374                         SCVAL(vwv+0, 0, 0xff);
2375                         SCVAL(vwv+0, 1, 0xff);
2376                         SSVAL(vwv+1, 0, 0);
2377                 }
2378
2379                 if (i == 0) {
2380                         /*
2381                          * The NBT and SMB header
2382                          */
2383                         this_iov[0] = state->smb1.iov[0];
2384                         this_iov[1] = state->smb1.iov[1];
2385                         this_iov += 2;
2386                 } else {
2387                         /*
2388                          * This one is a bit subtle. We have to add
2389                          * chain_padding bytes between the requests, and we
2390                          * have to also include the wct field of the
2391                          * subsequent requests. We use the subsequent header
2392                          * for the padding, it contains the wct field in its
2393                          * last byte.
2394                          */
2395                         this_iov[0].iov_len = chain_padding+1;
2396                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2397                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2398                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2399                         this_iov += 1;
2400                 }
2401
2402                 /*
2403                  * copy the words and bytes
2404                  */
2405                 memcpy(this_iov, state->smb1.iov+2,
2406                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2407                 this_iov += state->smb1.iov_count - 2;
2408                 chain_padding = next_padding;
2409         }
2410
2411         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
2412         if (nbt_len > first_state->conn->smb1.max_xmit) {
2413                 TALLOC_FREE(iov);
2414                 TALLOC_FREE(first_state->smb1.chained_requests);
2415                 return NT_STATUS_INVALID_PARAMETER_MIX;
2416         }
2417
2418         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2419         if (!NT_STATUS_IS_OK(status)) {
2420                 TALLOC_FREE(iov);
2421                 TALLOC_FREE(first_state->smb1.chained_requests);
2422                 return status;
2423         }
2424
2425         return NT_STATUS_OK;
2426 }
2427
2428 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2429 {
2430         return ((tevent_queue_length(conn->outgoing) != 0)
2431                 || (talloc_array_length(conn->pending) != 0));
2432 }
2433
2434 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2435 {
2436         return conn->smb2.server.capabilities;
2437 }
2438
2439 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2440 {
2441         return conn->smb2.server.security_mode;
2442 }
2443
2444 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2445 {
2446         return conn->smb2.server.max_trans_size;
2447 }
2448
2449 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2450 {
2451         return conn->smb2.server.max_read_size;
2452 }
2453
2454 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2455 {
2456         return conn->smb2.server.max_write_size;
2457 }
2458
2459 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2460                                   uint16_t max_credits)
2461 {
2462         conn->smb2.max_credits = max_credits;
2463 }
2464
2465 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2466
2467 static bool smb2cli_req_cancel(struct tevent_req *req)
2468 {
2469         struct smbXcli_req_state *state =
2470                 tevent_req_data(req,
2471                 struct smbXcli_req_state);
2472         uint32_t flags = IVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2473         uint64_t mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID);
2474         uint64_t aid = BVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID);
2475         struct smbXcli_tcon *tcon = state->tcon;
2476         struct smbXcli_session *session = state->session;
2477         uint8_t *fixed = state->smb2.pad;
2478         uint16_t fixed_len = 4;
2479         struct tevent_req *subreq;
2480         struct smbXcli_req_state *substate;
2481         NTSTATUS status;
2482
2483         SSVAL(fixed, 0, 0x04);
2484         SSVAL(fixed, 2, 0);
2485
2486         subreq = smb2cli_req_create(state, state->ev,
2487                                     state->conn,
2488                                     SMB2_OP_CANCEL,
2489                                     flags, 0,
2490                                     0, /* timeout */
2491                                     tcon, session,
2492                                     fixed, fixed_len,
2493                                     NULL, 0);
2494         if (subreq == NULL) {
2495                 return false;
2496         }
2497         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2498
2499         /*
2500          * clear everything but the SMB2_HDR_FLAG_ASYNC flag
2501          * e.g. if SMB2_HDR_FLAG_CHAINED is set we get INVALID_PARAMETER back
2502          */
2503         flags &= SMB2_HDR_FLAG_ASYNC;
2504
2505         if (flags & SMB2_HDR_FLAG_ASYNC) {
2506                 mid = 0;
2507         }
2508
2509         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, flags);
2510         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2511         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, aid);
2512
2513         status = smb2cli_req_compound_submit(&subreq, 1);
2514         if (!NT_STATUS_IS_OK(status)) {
2515                 TALLOC_FREE(subreq);
2516                 return false;
2517         }
2518
2519         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2520
2521         return true;
2522 }
2523
2524 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2525 {
2526         /* we do not care about the result */
2527         TALLOC_FREE(subreq);
2528 }
2529
2530 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2531                                       struct tevent_context *ev,
2532                                       struct smbXcli_conn *conn,
2533                                       uint16_t cmd,
2534                                       uint32_t additional_flags,
2535                                       uint32_t clear_flags,
2536                                       uint32_t timeout_msec,
2537                                       struct smbXcli_tcon *tcon,
2538                                       struct smbXcli_session *session,
2539                                       const uint8_t *fixed,
2540                                       uint16_t fixed_len,
2541                                       const uint8_t *dyn,
2542                                       uint32_t dyn_len)
2543 {
2544         struct tevent_req *req;
2545         struct smbXcli_req_state *state;
2546         uint32_t flags = 0;
2547         uint32_t tid = 0;
2548         uint64_t uid = 0;
2549         bool use_channel_sequence = false;
2550         uint16_t channel_sequence = 0;
2551
2552         req = tevent_req_create(mem_ctx, &state,
2553                                 struct smbXcli_req_state);
2554         if (req == NULL) {
2555                 return NULL;
2556         }
2557
2558         state->ev = ev;
2559         state->conn = conn;
2560         state->session = session;
2561         state->tcon = tcon;
2562
2563         if (conn->smb2.server.capabilities & SMB2_CAP_PERSISTENT_HANDLES) {
2564                 use_channel_sequence = true;
2565         } else if (conn->smb2.server.capabilities & SMB2_CAP_MULTI_CHANNEL) {
2566                 use_channel_sequence = true;
2567         }
2568
2569         if (session) {
2570                 uid = session->smb2->session_id;
2571
2572                 if (use_channel_sequence) {
2573                         channel_sequence = session->smb2->channel_sequence;
2574                 }
2575
2576                 state->smb2.should_sign = session->smb2->should_sign;
2577                 state->smb2.should_encrypt = session->smb2->should_encrypt;
2578
2579                 if (cmd == SMB2_OP_SESSSETUP &&
2580                     session->smb2->signing_key.length != 0) {
2581                         state->smb2.should_sign = true;
2582                 }
2583
2584                 if (cmd == SMB2_OP_SESSSETUP &&
2585                     session->smb2_channel.signing_key.length == 0) {
2586                         state->smb2.should_encrypt = false;
2587                 }
2588         }
2589
2590         if (tcon) {
2591                 tid = tcon->smb2.tcon_id;
2592
2593                 if (tcon->smb2.should_encrypt) {
2594                         state->smb2.should_encrypt = true;
2595                 }
2596         }
2597
2598         if (state->smb2.should_encrypt) {
2599                 state->smb2.should_sign = false;
2600         }
2601
2602         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2603         if (state->smb2.recv_iov == NULL) {
2604                 TALLOC_FREE(req);
2605                 return NULL;
2606         }
2607
2608         flags |= additional_flags;
2609         flags &= ~clear_flags;
2610
2611         state->smb2.fixed = fixed;
2612         state->smb2.fixed_len = fixed_len;
2613         state->smb2.dyn = dyn;
2614         state->smb2.dyn_len = dyn_len;
2615
2616         if (state->smb2.should_encrypt) {
2617                 SIVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2618                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID, uid);
2619         }
2620
2621         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2622         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2623         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2624         SSVAL(state->smb2.hdr, SMB2_HDR_CHANNEL_SEQUENCE, channel_sequence);
2625         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2626         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            0); /* reserved */
2627         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2628         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2629
2630         switch (cmd) {
2631         case SMB2_OP_CANCEL:
2632                 state->one_way = true;
2633                 break;
2634         case SMB2_OP_BREAK:
2635                 /*
2636                  * If this is a dummy request, it will have
2637                  * UINT64_MAX as message id.
2638                  * If we send on break acknowledgement,
2639                  * this gets overwritten later.
2640                  */
2641                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2642                 break;
2643         }
2644
2645         if (timeout_msec > 0) {
2646                 struct timeval endtime;
2647
2648                 endtime = timeval_current_ofs_msec(timeout_msec);
2649                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2650                         return req;
2651                 }
2652         }
2653
2654         return req;
2655 }
2656
2657 void smb2cli_req_set_notify_async(struct tevent_req *req)
2658 {
2659         struct smbXcli_req_state *state =
2660                 tevent_req_data(req,
2661                 struct smbXcli_req_state);
2662
2663         state->smb2.notify_async = true;
2664 }
2665
2666 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2667 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2668                                                TALLOC_CTX *tmp_mem,
2669                                                uint8_t *inbuf);
2670
2671 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2672                                      int num_reqs)
2673 {
2674         struct smbXcli_req_state *state;
2675         struct tevent_req *subreq;
2676         struct iovec *iov;
2677         int i, num_iov, nbt_len;
2678         int tf_iov = -1;
2679         const DATA_BLOB *encryption_key = NULL;
2680         uint64_t encryption_session_id = 0;
2681
2682         /*
2683          * 1 for the nbt length, optional TRANSFORM
2684          * per request: HDR, fixed, dyn, padding
2685          * -1 because the last one does not need padding
2686          */
2687
2688         iov = talloc_array(reqs[0], struct iovec, 1 + 1 + 4*num_reqs - 1);
2689         if (iov == NULL) {
2690                 return NT_STATUS_NO_MEMORY;
2691         }
2692
2693         num_iov = 1;
2694         nbt_len = 0;
2695
2696         /*
2697          * the session of the first request that requires encryption
2698          * specifies the encryption key.
2699          */
2700         for (i=0; i<num_reqs; i++) {
2701                 if (!tevent_req_is_in_progress(reqs[i])) {
2702                         return NT_STATUS_INTERNAL_ERROR;
2703                 }
2704
2705                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2706
2707                 if (!smbXcli_conn_is_connected(state->conn)) {
2708                         return NT_STATUS_CONNECTION_DISCONNECTED;
2709                 }
2710
2711                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2712                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2713                         return NT_STATUS_REVISION_MISMATCH;
2714                 }
2715
2716                 if (state->session == NULL) {
2717                         continue;
2718                 }
2719
2720                 if (!state->smb2.should_encrypt) {
2721                         continue;
2722                 }
2723
2724                 encryption_key = &state->session->smb2->encryption_key;
2725                 if (encryption_key->length == 0) {
2726                         return NT_STATUS_INVALID_PARAMETER_MIX;
2727                 }
2728
2729                 encryption_session_id = state->session->smb2->session_id;
2730
2731                 tf_iov = num_iov;
2732                 iov[num_iov].iov_base = state->smb2.transform;
2733                 iov[num_iov].iov_len  = sizeof(state->smb2.transform);
2734                 num_iov += 1;
2735
2736                 SBVAL(state->smb2.transform, SMB2_TF_PROTOCOL_ID, SMB2_TF_MAGIC);
2737                 SBVAL(state->smb2.transform, SMB2_TF_NONCE,
2738                       state->session->smb2->nonce_low);
2739                 SBVAL(state->smb2.transform, SMB2_TF_NONCE+8,
2740                       state->session->smb2->nonce_high);
2741                 SBVAL(state->smb2.transform, SMB2_TF_SESSION_ID,
2742                       encryption_session_id);
2743
2744                 state->session->smb2->nonce_low += 1;
2745                 if (state->session->smb2->nonce_low == 0) {
2746                         state->session->smb2->nonce_high += 1;
2747                         state->session->smb2->nonce_low += 1;
2748                 }
2749
2750                 nbt_len += SMB2_TF_HDR_SIZE;
2751                 break;
2752         }
2753
2754         for (i=0; i<num_reqs; i++) {
2755                 int hdr_iov;
2756                 size_t reqlen;
2757                 bool ret;
2758                 uint16_t opcode;
2759                 uint64_t avail;
2760                 uint16_t charge;
2761                 uint16_t credits;
2762                 uint64_t mid;
2763                 const DATA_BLOB *signing_key = NULL;
2764
2765                 if (!tevent_req_is_in_progress(reqs[i])) {
2766                         return NT_STATUS_INTERNAL_ERROR;
2767                 }
2768
2769                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2770
2771                 if (!smbXcli_conn_is_connected(state->conn)) {
2772                         return NT_STATUS_CONNECTION_DISCONNECTED;
2773                 }
2774
2775                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2776                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2777                         return NT_STATUS_REVISION_MISMATCH;
2778                 }
2779
2780                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2781                 if (opcode == SMB2_OP_CANCEL) {
2782                         goto skip_credits;
2783                 }
2784
2785                 avail = UINT64_MAX - state->conn->smb2.mid;
2786                 if (avail < 1) {
2787                         return NT_STATUS_CONNECTION_ABORTED;
2788                 }
2789
2790                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2791                         charge = (MAX(state->smb2.dyn_len, 1) - 1)/ 65536 + 1;
2792                 } else {
2793                         charge = 1;
2794                 }
2795
2796                 charge = MAX(state->smb2.credit_charge, charge);
2797
2798                 avail = MIN(avail, state->conn->smb2.cur_credits);
2799                 if (avail < charge) {
2800                         return NT_STATUS_INTERNAL_ERROR;
2801                 }
2802
2803                 credits = 0;
2804                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2805                         credits = state->conn->smb2.max_credits -
2806                                   state->conn->smb2.cur_credits;
2807                 }
2808                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2809                         credits += 1;
2810                 }
2811
2812                 mid = state->conn->smb2.mid;
2813                 state->conn->smb2.mid += charge;
2814                 state->conn->smb2.cur_credits -= charge;
2815
2816                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2817                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2818                 }
2819                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2820                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2821
2822 skip_credits:
2823                 if (state->session && encryption_key == NULL) {
2824                         /*
2825                          * We prefer the channel signing key if it is
2826                          * already there.
2827                          */
2828                         if (state->smb2.should_sign) {
2829                                 signing_key = &state->session->smb2_channel.signing_key;
2830                         }
2831
2832                         /*
2833                          * If it is a channel binding, we already have the main
2834                          * signing key and try that one.
2835                          */
2836                         if (signing_key && signing_key->length == 0) {
2837                                 signing_key = &state->session->smb2->signing_key;
2838                         }
2839
2840                         /*
2841                          * If we do not have any session key yet, we skip the
2842                          * signing of SMB2_OP_SESSSETUP requests.
2843                          */
2844                         if (signing_key && signing_key->length == 0) {
2845                                 signing_key = NULL;
2846                         }
2847                 }
2848
2849                 hdr_iov = num_iov;
2850                 iov[num_iov].iov_base = state->smb2.hdr;
2851                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2852                 num_iov += 1;
2853
2854                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2855                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2856                 num_iov += 1;
2857
2858                 if (state->smb2.dyn != NULL) {
2859                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2860                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2861                         num_iov += 1;
2862                 }
2863
2864                 reqlen  = sizeof(state->smb2.hdr);
2865                 reqlen += state->smb2.fixed_len;
2866                 reqlen += state->smb2.dyn_len;
2867
2868                 if (i < num_reqs-1) {
2869                         if ((reqlen % 8) > 0) {
2870                                 uint8_t pad = 8 - (reqlen % 8);
2871                                 iov[num_iov].iov_base = state->smb2.pad;
2872                                 iov[num_iov].iov_len = pad;
2873                                 num_iov += 1;
2874                                 reqlen += pad;
2875                         }
2876                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2877                 }
2878
2879                 state->smb2.encryption_session_id = encryption_session_id;
2880
2881                 if (signing_key != NULL) {
2882                         NTSTATUS status;
2883
2884                         status = smb2_signing_sign_pdu(*signing_key,
2885                                                        state->session->conn->protocol,
2886                                                        &iov[hdr_iov], num_iov - hdr_iov);
2887                         if (!NT_STATUS_IS_OK(status)) {
2888                                 return status;
2889                         }
2890                 }
2891
2892                 nbt_len += reqlen;
2893
2894                 ret = smbXcli_req_set_pending(reqs[i]);
2895                 if (!ret) {
2896                         return NT_STATUS_NO_MEMORY;
2897                 }
2898         }
2899
2900         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2901         _smb_setlen_tcp(state->length_hdr, nbt_len);
2902         iov[0].iov_base = state->length_hdr;
2903         iov[0].iov_len  = sizeof(state->length_hdr);
2904
2905         if (encryption_key != NULL) {
2906                 NTSTATUS status;
2907                 size_t buflen = nbt_len - SMB2_TF_HDR_SIZE;
2908                 uint8_t *buf;
2909                 int vi;
2910
2911                 buf = talloc_array(iov, uint8_t, buflen);
2912                 if (buf == NULL) {
2913                         return NT_STATUS_NO_MEMORY;
2914                 }
2915
2916                 /*
2917                  * We copy the buffers before encrypting them,
2918                  * this is at least currently needed for the
2919                  * to keep state->smb2.hdr.
2920                  *
2921                  * Also the callers may expect there buffers
2922                  * to be const.
2923                  */
2924                 for (vi = tf_iov + 1; vi < num_iov; vi++) {
2925                         struct iovec *v = &iov[vi];
2926                         const uint8_t *o = (const uint8_t *)v->iov_base;
2927
2928                         memcpy(buf, o, v->iov_len);
2929                         v->iov_base = (void *)buf;
2930                         buf += v->iov_len;
2931                 }
2932
2933                 status = smb2_signing_encrypt_pdu(*encryption_key,
2934                                         state->conn->protocol,
2935                                         &iov[tf_iov], num_iov - tf_iov);
2936                 if (!NT_STATUS_IS_OK(status)) {
2937                         return status;
2938                 }
2939         }
2940
2941         if (state->conn->dispatch_incoming == NULL) {
2942                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2943         }
2944
2945         subreq = writev_send(state, state->ev, state->conn->outgoing,
2946                              state->conn->write_fd, false, iov, num_iov);
2947         if (subreq == NULL) {
2948                 return NT_STATUS_NO_MEMORY;
2949         }
2950         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
2951         return NT_STATUS_OK;
2952 }
2953
2954 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
2955 {
2956         struct smbXcli_req_state *state =
2957                 tevent_req_data(req,
2958                 struct smbXcli_req_state);
2959
2960         state->smb2.credit_charge = charge;
2961 }
2962
2963 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
2964                                     struct tevent_context *ev,
2965                                     struct smbXcli_conn *conn,
2966                                     uint16_t cmd,
2967                                     uint32_t additional_flags,
2968                                     uint32_t clear_flags,
2969                                     uint32_t timeout_msec,
2970                                     struct smbXcli_tcon *tcon,
2971                                     struct smbXcli_session *session,
2972                                     const uint8_t *fixed,
2973                                     uint16_t fixed_len,
2974                                     const uint8_t *dyn,
2975                                     uint32_t dyn_len)
2976 {
2977         struct tevent_req *req;
2978         NTSTATUS status;
2979
2980         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
2981                                  additional_flags, clear_flags,
2982                                  timeout_msec,
2983                                  tcon, session,
2984                                  fixed, fixed_len, dyn, dyn_len);
2985         if (req == NULL) {
2986                 return NULL;
2987         }
2988         if (!tevent_req_is_in_progress(req)) {
2989                 return tevent_req_post(req, ev);
2990         }
2991         status = smb2cli_req_compound_submit(&req, 1);
2992         if (tevent_req_nterror(req, status)) {
2993                 return tevent_req_post(req, ev);
2994         }
2995         return req;
2996 }
2997
2998 static void smb2cli_req_writev_done(struct tevent_req *subreq)
2999 {
3000         struct tevent_req *req =
3001                 tevent_req_callback_data(subreq,
3002                 struct tevent_req);
3003         struct smbXcli_req_state *state =
3004                 tevent_req_data(req,
3005                 struct smbXcli_req_state);
3006         ssize_t nwritten;
3007         int err;
3008
3009         nwritten = writev_recv(subreq, &err);
3010         TALLOC_FREE(subreq);
3011         if (nwritten == -1) {
3012                 /* here, we need to notify all pending requests */
3013                 NTSTATUS status = map_nt_error_from_unix_common(err);
3014                 smbXcli_conn_disconnect(state->conn, status);
3015                 return;
3016         }
3017 }
3018
3019 static NTSTATUS smb2cli_inbuf_parse_compound(struct smbXcli_conn *conn,
3020                                              uint8_t *buf,
3021                                              size_t buflen,
3022                                              TALLOC_CTX *mem_ctx,
3023                                              struct iovec **piov, int *pnum_iov)
3024 {
3025         struct iovec *iov;
3026         int num_iov = 0;
3027         size_t taken = 0;
3028         uint8_t *first_hdr = buf;
3029         size_t verified_buflen = 0;
3030         uint8_t *tf = NULL;
3031         size_t tf_len = 0;
3032
3033         iov = talloc_array(mem_ctx, struct iovec, num_iov);
3034         if (iov == NULL) {
3035                 return NT_STATUS_NO_MEMORY;
3036         }
3037
3038         while (taken < buflen) {
3039                 size_t len = buflen - taken;
3040                 uint8_t *hdr = first_hdr + taken;
3041                 struct iovec *cur;
3042                 size_t full_size;
3043                 size_t next_command_ofs;
3044                 uint16_t body_size;
3045                 struct iovec *iov_tmp;
3046
3047                 if (verified_buflen > taken) {
3048                         len = verified_buflen - taken;
3049                 } else {
3050                         tf = NULL;
3051                         tf_len = 0;
3052                 }
3053
3054                 if (len < 4) {
3055                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3056                                    (int)len, 4));
3057                         goto inval;
3058                 }
3059                 if (IVAL(hdr, 0) == SMB2_TF_MAGIC) {
3060                         struct smbXcli_session *s;
3061                         uint64_t uid;
3062                         struct iovec tf_iov[2];
3063                         size_t enc_len;
3064                         NTSTATUS status;
3065
3066                         if (len < SMB2_TF_HDR_SIZE) {
3067                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3068                                            (int)len, SMB2_TF_HDR_SIZE));
3069                                 goto inval;
3070                         }
3071                         tf = hdr;
3072                         tf_len = SMB2_TF_HDR_SIZE;
3073                         taken += tf_len;
3074
3075                         hdr = first_hdr + taken;
3076                         enc_len = IVAL(tf, SMB2_TF_MSG_SIZE);
3077                         uid = BVAL(tf, SMB2_TF_SESSION_ID);
3078
3079                         if (len < SMB2_TF_HDR_SIZE + enc_len) {
3080                                 DEBUG(10, ("%d bytes left, expected at least %d\n",
3081                                            (int)len,
3082                                            (int)(SMB2_TF_HDR_SIZE + enc_len)));
3083                                 goto inval;
3084                         }
3085
3086                         s = conn->sessions;
3087                         for (; s; s = s->next) {
3088                                 if (s->smb2->session_id != uid) {
3089                                         continue;
3090                                 }
3091                                 break;
3092                         }
3093
3094                         if (s == NULL) {
3095                                 DEBUG(10, ("unknown session_id %llu\n",
3096                                            (unsigned long long)uid));
3097                                 goto inval;
3098                         }
3099
3100                         tf_iov[0].iov_base = (void *)tf;
3101                         tf_iov[0].iov_len = tf_len;
3102                         tf_iov[1].iov_base = (void *)hdr;
3103                         tf_iov[1].iov_len = enc_len;
3104
3105                         status = smb2_signing_decrypt_pdu(s->smb2->decryption_key,
3106                                                           conn->protocol,
3107                                                           tf_iov, 2);
3108                         if (!NT_STATUS_IS_OK(status)) {
3109                                 TALLOC_FREE(iov);
3110                                 return status;
3111                         }
3112
3113                         verified_buflen = taken + enc_len;
3114                         len = enc_len;
3115                 }
3116
3117                 /*
3118                  * We need the header plus the body length field
3119                  */
3120
3121                 if (len < SMB2_HDR_BODY + 2) {
3122                         DEBUG(10, ("%d bytes left, expected at least %d\n",
3123                                    (int)len, SMB2_HDR_BODY));
3124                         goto inval;
3125                 }
3126                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
3127                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
3128                                    IVAL(hdr, 0)));
3129                         goto inval;
3130                 }
3131                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
3132                         DEBUG(10, ("Got HDR len %d, expected %d\n",
3133                                    SVAL(hdr, 4), SMB2_HDR_BODY));
3134                         goto inval;
3135                 }
3136
3137                 full_size = len;
3138                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
3139                 body_size = SVAL(hdr, SMB2_HDR_BODY);
3140
3141                 if (next_command_ofs != 0) {
3142                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
3143                                 goto inval;
3144                         }
3145                         if (next_command_ofs > full_size) {
3146                                 goto inval;
3147                         }
3148                         full_size = next_command_ofs;
3149                 }
3150                 if (body_size < 2) {
3151                         goto inval;
3152                 }
3153                 body_size &= 0xfffe;
3154
3155                 if (body_size > (full_size - SMB2_HDR_BODY)) {
3156                         goto inval;
3157                 }
3158
3159                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
3160                                          num_iov + 4);
3161                 if (iov_tmp == NULL) {
3162                         TALLOC_FREE(iov);
3163                         return NT_STATUS_NO_MEMORY;
3164                 }
3165                 iov = iov_tmp;
3166                 cur = &iov[num_iov];
3167                 num_iov += 4;
3168
3169                 cur[0].iov_base = tf;
3170                 cur[0].iov_len  = tf_len;
3171                 cur[1].iov_base = hdr;
3172                 cur[1].iov_len  = SMB2_HDR_BODY;
3173                 cur[2].iov_base = hdr + SMB2_HDR_BODY;
3174                 cur[2].iov_len  = body_size;
3175                 cur[3].iov_base = hdr + SMB2_HDR_BODY + body_size;
3176                 cur[3].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
3177
3178                 taken += full_size;
3179         }
3180
3181         *piov = iov;
3182         *pnum_iov = num_iov;
3183         return NT_STATUS_OK;
3184
3185 inval:
3186         TALLOC_FREE(iov);
3187         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3188 }
3189
3190 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
3191                                                     uint64_t mid)
3192 {
3193         size_t num_pending = talloc_array_length(conn->pending);
3194         size_t i;
3195
3196         for (i=0; i<num_pending; i++) {
3197                 struct tevent_req *req = conn->pending[i];
3198                 struct smbXcli_req_state *state =
3199                         tevent_req_data(req,
3200                         struct smbXcli_req_state);
3201
3202                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
3203                         return req;
3204                 }
3205         }
3206         return NULL;
3207 }
3208
3209 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
3210                                                TALLOC_CTX *tmp_mem,
3211                                                uint8_t *inbuf)
3212 {
3213         struct tevent_req *req;
3214         struct smbXcli_req_state *state = NULL;
3215         struct iovec *iov;
3216         int i, num_iov;
3217         NTSTATUS status;
3218         bool defer = true;
3219         struct smbXcli_session *last_session = NULL;
3220         size_t inbuf_len = smb_len_tcp(inbuf);
3221
3222         status = smb2cli_inbuf_parse_compound(conn,
3223                                               inbuf + NBT_HDR_SIZE,
3224                                               inbuf_len,
3225                                               tmp_mem,
3226                                               &iov, &num_iov);
3227         if (!NT_STATUS_IS_OK(status)) {
3228                 return status;
3229         }
3230
3231         for (i=0; i<num_iov; i+=4) {
3232                 uint8_t *inbuf_ref = NULL;
3233                 struct iovec *cur = &iov[i];
3234                 uint8_t *inhdr = (uint8_t *)cur[1].iov_base;
3235                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
3236                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
3237                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
3238                 uint16_t req_opcode;
3239                 uint32_t req_flags;
3240                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
3241                 uint32_t new_credits;
3242                 struct smbXcli_session *session = NULL;
3243                 const DATA_BLOB *signing_key = NULL;
3244                 bool was_encrypted = false;
3245
3246                 new_credits = conn->smb2.cur_credits;
3247                 new_credits += credits;
3248                 if (new_credits > UINT16_MAX) {
3249                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3250                 }
3251                 conn->smb2.cur_credits += credits;
3252
3253                 req = smb2cli_conn_find_pending(conn, mid);
3254                 if (req == NULL) {
3255                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3256                 }
3257                 state = tevent_req_data(req, struct smbXcli_req_state);
3258
3259                 state->smb2.got_async = false;
3260
3261                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
3262                 if (opcode != req_opcode) {
3263                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3264                 }
3265                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
3266
3267                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
3268                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3269                 }
3270
3271                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
3272                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
3273                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
3274                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
3275
3276                         /*
3277                          * async interim responses are not signed,
3278                          * even if the SMB2_HDR_FLAG_SIGNED flag
3279                          * is set.
3280                          */
3281                         req_flags |= SMB2_HDR_FLAG_ASYNC;
3282                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
3283                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
3284
3285                         if (state->smb2.notify_async) {
3286                                 state->smb2.got_async = true;
3287                                 tevent_req_defer_callback(req, state->ev);
3288                                 tevent_req_notify_callback(req);
3289                         }
3290                         continue;
3291                 }
3292
3293                 session = state->session;
3294                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
3295                         session = last_session;
3296                 }
3297                 last_session = session;
3298
3299                 if (state->smb2.should_sign) {
3300                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
3301                                 return NT_STATUS_ACCESS_DENIED;
3302                         }
3303                 }
3304
3305                 if (flags & SMB2_HDR_FLAG_SIGNED) {
3306                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
3307
3308                         if (session == NULL) {
3309                                 struct smbXcli_session *s;
3310
3311                                 s = state->conn->sessions;
3312                                 for (; s; s = s->next) {
3313                                         if (s->smb2->session_id != uid) {
3314                                                 continue;
3315                                         }
3316
3317                                         session = s;
3318                                         break;
3319                                 }
3320                         }
3321
3322                         if (session == NULL) {
3323                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3324                         }
3325
3326                         last_session = session;
3327                         signing_key = &session->smb2_channel.signing_key;
3328                 }
3329
3330                 if (opcode == SMB2_OP_SESSSETUP) {
3331                         /*
3332                          * We prefer the channel signing key, if it is
3333                          * already there.
3334                          *
3335                          * If we do not have a channel signing key yet,
3336                          * we try the main signing key, if it is not
3337                          * the final response.
3338                          */
3339                         if (signing_key && signing_key->length == 0 &&
3340                             !NT_STATUS_IS_OK(status)) {
3341                                 signing_key = &session->smb2->signing_key;
3342                         }
3343
3344                         if (signing_key && signing_key->length == 0) {
3345                                 /*
3346                                  * If we do not have a session key to
3347                                  * verify the signature, we defer the
3348                                  * signing check to the caller.
3349                                  *
3350                                  * The caller gets NT_STATUS_OK, it
3351                                  * has to call
3352                                  * smb2cli_session_set_session_key()
3353                                  * or
3354                                  * smb2cli_session_set_channel_key()
3355                                  * which will check the signature
3356                                  * with the channel signing key.
3357                                  */
3358                                 signing_key = NULL;
3359                         }
3360                 }
3361
3362                 if (cur[0].iov_len == SMB2_TF_HDR_SIZE) {
3363                         const uint8_t *tf = (const uint8_t *)cur[0].iov_base;
3364                         uint64_t uid = BVAL(tf, SMB2_TF_SESSION_ID);
3365
3366                         /*
3367                          * If the response was encrypted in a SMB2_TRANSFORM
3368                          * pdu, which belongs to the correct session,
3369                          * we do not need to do signing checks
3370                          *
3371                          * It could be the session the response belongs to
3372                          * or the session that was used to encrypt the
3373                          * SMB2_TRANSFORM request.
3374                          */
3375                         if ((session && session->smb2->session_id == uid) ||
3376                             (state->smb2.encryption_session_id == uid)) {
3377                                 signing_key = NULL;
3378                                 was_encrypted = true;
3379                         }
3380                 }
3381
3382                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
3383                         /*
3384                          * if the server returns NT_STATUS_USER_SESSION_DELETED
3385                          * the response is not signed and we should
3386                          * propagate the NT_STATUS_USER_SESSION_DELETED
3387                          * status to the caller.
3388                          */
3389                         state->smb2.signing_skipped = true;
3390                         signing_key = NULL;
3391                 }
3392
3393                 if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3394                         /*
3395                          * if the server returns
3396                          * NT_STATUS_INVALID_PARAMETER
3397                          * the response might not be encrypted.
3398                          */
3399                         if (state->smb2.should_encrypt && !was_encrypted) {
3400                                 state->smb2.signing_skipped = true;
3401                                 signing_key = NULL;
3402                         }
3403                 }
3404
3405                 if (state->smb2.should_encrypt && !was_encrypted) {
3406                         if (!state->smb2.signing_skipped) {
3407                                 return NT_STATUS_ACCESS_DENIED;
3408                         }
3409                 }
3410
3411                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
3412                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
3413                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
3414                         /*
3415                          * if the server returns
3416                          * NT_STATUS_NETWORK_NAME_DELETED
3417                          * NT_STATUS_FILE_CLOSED
3418                          * NT_STATUS_INVALID_PARAMETER
3419                          * the response might not be signed
3420                          * as this happens before the signing checks.
3421                          *
3422                          * If server echos the signature (or all zeros)
3423                          * we should report the status from the server
3424                          * to the caller.
3425                          */
3426                         if (signing_key) {
3427                                 int cmp;
3428
3429                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3430                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
3431                                              16);
3432                                 if (cmp == 0) {
3433                                         state->smb2.signing_skipped = true;
3434                                         signing_key = NULL;
3435                                 }
3436                         }
3437                         if (signing_key) {
3438                                 int cmp;
3439                                 static const uint8_t zeros[16];
3440
3441                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
3442                                              zeros,
3443                                              16);
3444                                 if (cmp == 0) {
3445                                         state->smb2.signing_skipped = true;
3446                                         signing_key = NULL;
3447                                 }
3448                         }
3449                 }
3450
3451                 if (signing_key) {
3452                         status = smb2_signing_check_pdu(*signing_key,
3453                                                         state->conn->protocol,
3454                                                         &cur[1], 3);
3455                         if (!NT_STATUS_IS_OK(status)) {
3456                                 /*
3457                                  * If the signing check fails, we disconnect
3458                                  * the connection.
3459                                  */
3460                                 return status;
3461                         }
3462                 }
3463
3464                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED) &&
3465                     (session != NULL) && session->disconnect_expired)
3466                 {
3467                         /*
3468                          * this should be a short term hack
3469                          * until the upper layers have implemented
3470                          * re-authentication.
3471                          */
3472                         return status;
3473                 }
3474
3475                 smbXcli_req_unset_pending(req);
3476
3477                 /*
3478                  * There might be more than one response
3479                  * we need to defer the notifications
3480                  */
3481                 if ((num_iov == 5) && (talloc_array_length(conn->pending) == 0)) {
3482                         defer = false;
3483                 }
3484
3485                 if (defer) {
3486                         tevent_req_defer_callback(req, state->ev);
3487                 }
3488
3489                 /*
3490                  * Note: here we use talloc_reference() in a way
3491                  *       that does not expose it to the caller.
3492                  */
3493                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3494                 if (tevent_req_nomem(inbuf_ref, req)) {
3495                         continue;
3496                 }
3497
3498                 /* copy the related buffers */
3499                 state->smb2.recv_iov[0] = cur[1];
3500                 state->smb2.recv_iov[1] = cur[2];
3501                 state->smb2.recv_iov[2] = cur[3];
3502
3503                 tevent_req_done(req);
3504         }
3505
3506         if (defer) {
3507                 return NT_STATUS_RETRY;
3508         }
3509
3510         return NT_STATUS_OK;
3511 }
3512
3513 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3514                           struct iovec **piov,
3515                           const struct smb2cli_req_expected_response *expected,
3516                           size_t num_expected)
3517 {
3518         struct smbXcli_req_state *state =
3519                 tevent_req_data(req,
3520                 struct smbXcli_req_state);
3521         NTSTATUS status;
3522         size_t body_size;
3523         bool found_status = false;
3524         bool found_size = false;
3525         size_t i;
3526
3527         if (piov != NULL) {
3528                 *piov = NULL;
3529         }
3530
3531         if (state->smb2.got_async) {
3532                 return STATUS_PENDING;
3533         }
3534
3535         if (tevent_req_is_nterror(req, &status)) {
3536                 for (i=0; i < num_expected; i++) {
3537                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
3538                                 found_status = true;
3539                                 break;
3540                         }
3541                 }
3542
3543                 if (found_status) {
3544                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3545                 }
3546
3547                 return status;
3548         }
3549
3550         if (num_expected == 0) {
3551                 found_status = true;
3552                 found_size = true;
3553         }
3554
3555         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3556         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3557
3558         for (i=0; i < num_expected; i++) {
3559                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3560                         continue;
3561                 }
3562
3563                 found_status = true;
3564                 if (expected[i].body_size == 0) {
3565                         found_size = true;
3566                         break;
3567                 }
3568
3569                 if (expected[i].body_size == body_size) {
3570                         found_size = true;
3571                         break;
3572                 }
3573         }
3574
3575         if (!found_status) {
3576                 return status;
3577         }
3578
3579         if (state->smb2.signing_skipped) {
3580                 if (num_expected > 0) {
3581                         return NT_STATUS_ACCESS_DENIED;
3582                 }
3583                 if (!NT_STATUS_IS_ERR(status)) {
3584                         return NT_STATUS_ACCESS_DENIED;
3585                 }
3586         }
3587
3588         if (!found_size) {
3589                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3590         }
3591
3592         if (piov != NULL) {
3593                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3594         }
3595
3596         return status;
3597 }
3598
3599 static const struct {
3600         enum protocol_types proto;
3601         const char *smb1_name;
3602 } smb1cli_prots[] = {
3603         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3604         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3605         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3606         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3607         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3608         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3609         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3610         {PROTOCOL_LANMAN2,      "Samba"},
3611         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3612         {PROTOCOL_NT1,          "NT LM 0.12"},
3613         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3614         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3615 };
3616
3617 static const struct {
3618         enum protocol_types proto;
3619         uint16_t smb2_dialect;
3620 } smb2cli_prots[] = {
3621         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3622         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3623         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3624         {PROTOCOL_SMB2_24,      SMB2_DIALECT_REVISION_224},
3625         {PROTOCOL_SMB3_00,      SMB3_DIALECT_REVISION_300},
3626 };
3627
3628 struct smbXcli_negprot_state {
3629         struct smbXcli_conn *conn;
3630         struct tevent_context *ev;
3631         uint32_t timeout_msec;
3632         enum protocol_types min_protocol;
3633         enum protocol_types max_protocol;
3634
3635         struct {
3636                 uint8_t fixed[36];
3637                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
3638         } smb2;
3639 };
3640
3641 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3642 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3643 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3644 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3645 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3646 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3647                                                   TALLOC_CTX *frame,
3648                                                   uint8_t *inbuf);
3649
3650 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3651                                         struct tevent_context *ev,
3652                                         struct smbXcli_conn *conn,
3653                                         uint32_t timeout_msec,
3654                                         enum protocol_types min_protocol,
3655                                         enum protocol_types max_protocol)
3656 {
3657         struct tevent_req *req, *subreq;
3658         struct smbXcli_negprot_state *state;
3659
3660         req = tevent_req_create(mem_ctx, &state,
3661                                 struct smbXcli_negprot_state);
3662         if (req == NULL) {
3663                 return NULL;
3664         }
3665         state->conn = conn;
3666         state->ev = ev;
3667         state->timeout_msec = timeout_msec;
3668         state->min_protocol = min_protocol;
3669         state->max_protocol = max_protocol;
3670
3671         if (min_protocol == PROTOCOL_NONE) {
3672                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3673                 return tevent_req_post(req, ev);
3674         }
3675
3676         if (max_protocol == PROTOCOL_NONE) {
3677                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3678                 return tevent_req_post(req, ev);
3679         }
3680
3681         if (min_protocol > max_protocol) {
3682                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3683                 return tevent_req_post(req, ev);
3684         }
3685
3686         if ((min_protocol < PROTOCOL_SMB2_02) &&
3687             (max_protocol < PROTOCOL_SMB2_02)) {
3688                 /*
3689                  * SMB1 only...
3690                  */
3691                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3692
3693                 subreq = smbXcli_negprot_smb1_subreq(state);
3694                 if (tevent_req_nomem(subreq, req)) {
3695                         return tevent_req_post(req, ev);
3696                 }
3697                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3698                 return req;
3699         }
3700
3701         if ((min_protocol >= PROTOCOL_SMB2_02) &&
3702             (max_protocol >= PROTOCOL_SMB2_02)) {
3703                 /*
3704                  * SMB2 only...
3705                  */
3706                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3707
3708                 subreq = smbXcli_negprot_smb2_subreq(state);
3709                 if (tevent_req_nomem(subreq, req)) {
3710                         return tevent_req_post(req, ev);
3711                 }
3712                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3713                 return req;
3714         }
3715
3716         /*
3717          * We send an SMB1 negprot with the SMB2 dialects
3718          * and expect a SMB1 or a SMB2 response.
3719          *
3720          * smbXcli_negprot_dispatch_incoming() will fix the
3721          * callback to match protocol of the response.
3722          */
3723         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
3724
3725         subreq = smbXcli_negprot_smb1_subreq(state);
3726         if (tevent_req_nomem(subreq, req)) {
3727                 return tevent_req_post(req, ev);
3728         }
3729         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
3730         return req;
3731 }
3732
3733 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
3734 {
3735         struct tevent_req *req =
3736                 tevent_req_callback_data(subreq,
3737                 struct tevent_req);
3738         NTSTATUS status;
3739
3740         /*
3741          * we just want the low level error
3742          */
3743         status = tevent_req_simple_recv_ntstatus(subreq);
3744         TALLOC_FREE(subreq);
3745         if (tevent_req_nterror(req, status)) {
3746                 return;
3747         }
3748
3749         /* this should never happen */
3750         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3751 }
3752
3753 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
3754 {
3755         size_t i;
3756         DATA_BLOB bytes = data_blob_null;
3757         uint8_t flags;
3758         uint16_t flags2;
3759
3760         /* setup the protocol strings */
3761         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3762                 uint8_t c = 2;
3763                 bool ok;
3764
3765                 if (smb1cli_prots[i].proto < state->min_protocol) {
3766                         continue;
3767                 }
3768
3769                 if (smb1cli_prots[i].proto > state->max_protocol) {
3770                         continue;
3771                 }
3772
3773                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
3774                 if (!ok) {
3775                         return NULL;
3776                 }
3777
3778                 /*
3779                  * We now it is already ascii and
3780                  * we want NULL termination.
3781                  */
3782                 ok = data_blob_append(state, &bytes,
3783                                       smb1cli_prots[i].smb1_name,
3784                                       strlen(smb1cli_prots[i].smb1_name)+1);
3785                 if (!ok) {
3786                         return NULL;
3787                 }
3788         }
3789
3790         smb1cli_req_flags(state->max_protocol,
3791                           state->conn->smb1.client.capabilities,
3792                           SMBnegprot,
3793                           0, 0, &flags,
3794                           0, 0, &flags2);
3795
3796         return smb1cli_req_send(state, state->ev, state->conn,
3797                                 SMBnegprot,
3798                                 flags, ~flags,
3799                                 flags2, ~flags2,
3800                                 state->timeout_msec,
3801                                 0xFFFE, 0, NULL, /* pid, tid, session */
3802                                 0, NULL, /* wct, vwv */
3803                                 bytes.length, bytes.data);
3804 }
3805
3806 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
3807 {
3808         struct tevent_req *req =
3809                 tevent_req_callback_data(subreq,
3810                 struct tevent_req);
3811         struct smbXcli_negprot_state *state =
3812                 tevent_req_data(req,
3813                 struct smbXcli_negprot_state);
3814         struct smbXcli_conn *conn = state->conn;
3815         struct iovec *recv_iov = NULL;
3816         uint8_t *inhdr;
3817         uint8_t wct;
3818         uint16_t *vwv;
3819         uint32_t num_bytes;
3820         uint8_t *bytes;
3821         NTSTATUS status;
3822         uint16_t protnum;
3823         size_t i;
3824         size_t num_prots = 0;
3825         uint8_t flags;
3826         uint32_t client_capabilities = conn->smb1.client.capabilities;
3827         uint32_t both_capabilities;
3828         uint32_t server_capabilities = 0;
3829         uint32_t capabilities;
3830         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
3831         uint32_t server_max_xmit = 0;
3832         uint32_t max_xmit;
3833         uint32_t server_max_mux = 0;
3834         uint16_t server_security_mode = 0;
3835         uint32_t server_session_key = 0;
3836         bool server_readbraw = false;
3837         bool server_writebraw = false;
3838         bool server_lockread = false;
3839         bool server_writeunlock = false;
3840         struct GUID server_guid = GUID_zero();
3841         DATA_BLOB server_gss_blob = data_blob_null;
3842         uint8_t server_challenge[8];
3843         char *server_workgroup = NULL;
3844         char *server_name = NULL;
3845         int server_time_zone = 0;
3846         NTTIME server_system_time = 0;
3847         static const struct smb1cli_req_expected_response expected[] = {
3848         {
3849                 .status = NT_STATUS_OK,
3850                 .wct = 0x11, /* NT1 */
3851         },
3852         {
3853                 .status = NT_STATUS_OK,
3854                 .wct = 0x0D, /* LM */
3855         },
3856         {
3857                 .status = NT_STATUS_OK,
3858                 .wct = 0x01, /* CORE */
3859         }
3860         };
3861
3862         ZERO_STRUCT(server_challenge);
3863
3864         status = smb1cli_req_recv(subreq, state,
3865                                   &recv_iov,
3866                                   &inhdr,
3867                                   &wct,
3868                                   &vwv,
3869                                   NULL, /* pvwv_offset */
3870                                   &num_bytes,
3871                                   &bytes,
3872                                   NULL, /* pbytes_offset */
3873                                   NULL, /* pinbuf */
3874                                   expected, ARRAY_SIZE(expected));
3875         TALLOC_FREE(subreq);
3876         if (tevent_req_nterror(req, status)) {
3877                 return;
3878         }
3879
3880         flags = CVAL(inhdr, HDR_FLG);
3881
3882         protnum = SVAL(vwv, 0);
3883
3884         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3885                 if (smb1cli_prots[i].proto < state->min_protocol) {
3886                         continue;
3887                 }
3888
3889                 if (smb1cli_prots[i].proto > state->max_protocol) {
3890                         continue;
3891                 }
3892
3893                 if (protnum != num_prots) {
3894                         num_prots++;
3895                         continue;
3896                 }
3897
3898                 conn->protocol = smb1cli_prots[i].proto;
3899                 break;
3900         }
3901
3902         if (conn->protocol == PROTOCOL_NONE) {
3903                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3904                 return;
3905         }
3906
3907         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
3908                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
3909                          "and the selected protocol level doesn't support it.\n"));
3910                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3911                 return;
3912         }
3913
3914         if (flags & FLAG_SUPPORT_LOCKREAD) {
3915                 server_lockread = true;
3916                 server_writeunlock = true;
3917         }
3918
3919         if (conn->protocol >= PROTOCOL_NT1) {
3920                 const char *client_signing = NULL;
3921                 bool server_mandatory = false;
3922                 bool server_allowed = false;
3923                 const char *server_signing = NULL;
3924                 bool ok;
3925                 uint8_t key_len;
3926
3927                 if (wct != 0x11) {
3928                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3929                         return;
3930                 }
3931
3932                 /* NT protocol */
3933                 server_security_mode = CVAL(vwv + 1, 0);
3934                 server_max_mux = SVAL(vwv + 1, 1);
3935                 server_max_xmit = IVAL(vwv + 3, 1);
3936                 server_session_key = IVAL(vwv + 7, 1);
3937                 server_time_zone = SVALS(vwv + 15, 1);
3938                 server_time_zone *= 60;
3939                 /* this time arrives in real GMT */
3940                 server_system_time = BVAL(vwv + 11, 1);
3941                 server_capabilities = IVAL(vwv + 9, 1);
3942
3943                 key_len = CVAL(vwv + 16, 1);
3944
3945                 if (server_capabilities & CAP_RAW_MODE) {
3946                         server_readbraw = true;
3947                         server_writebraw = true;
3948                 }
3949                 if (server_capabilities & CAP_LOCK_AND_READ) {
3950                         server_lockread = true;
3951                 }
3952
3953                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
3954                         DATA_BLOB blob1, blob2;
3955
3956                         if (num_bytes < 16) {
3957                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3958                                 return;
3959                         }
3960
3961                         blob1 = data_blob_const(bytes, 16);
3962                         status = GUID_from_data_blob(&blob1, &server_guid);
3963                         if (tevent_req_nterror(req, status)) {
3964                                 return;
3965                         }
3966
3967                         blob1 = data_blob_const(bytes+16, num_bytes-16);
3968                         blob2 = data_blob_dup_talloc(state, blob1);
3969                         if (blob1.length > 0 &&
3970                             tevent_req_nomem(blob2.data, req)) {
3971                                 return;
3972                         }
3973                         server_gss_blob = blob2;
3974                 } else {
3975                         DATA_BLOB blob1, blob2;
3976
3977                         if (num_bytes < key_len) {
3978                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3979                                 return;
3980                         }
3981
3982                         if (key_len != 0 && key_len != 8) {
3983                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3984                                 return;
3985                         }
3986
3987                         if (key_len == 8) {
3988                                 memcpy(server_challenge, bytes, 8);
3989                         }
3990
3991                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3992                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
3993                         if (blob1.length > 0) {
3994                                 size_t len;
3995
3996                                 len = utf16_len_n(blob1.data,
3997                                                   blob1.length);
3998                                 blob1.length = len;
3999
4000                                 ok = convert_string_talloc(state,
4001                                                            CH_UTF16LE,
4002                                                            CH_UNIX,
4003                                                            blob1.data,
4004                                                            blob1.length,
4005                                                            &server_workgroup,
4006                                                            &len);
4007                                 if (!ok) {
4008                                         status = map_nt_error_from_unix_common(errno);
4009                                         tevent_req_nterror(req, status);
4010                                         return;
4011                                 }
4012                         }
4013
4014                         blob2.data += blob1.length;
4015                         blob2.length -= blob1.length;
4016                         if (blob2.length > 0) {
4017                                 size_t len;
4018
4019                                 len = utf16_len_n(blob1.data,
4020                                                   blob1.length);
4021                                 blob1.length = len;
4022
4023                                 ok = convert_string_talloc(state,
4024                                                            CH_UTF16LE,
4025                                                            CH_UNIX,
4026                                                            blob2.data,
4027                                                            blob2.length,
4028                                                            &server_name,
4029                                                            &len);
4030                                 if (!ok) {
4031                                         status = map_nt_error_from_unix_common(errno);
4032                                         tevent_req_nterror(req, status);
4033                                         return;
4034                                 }
4035                         }
4036                 }
4037
4038                 client_signing = "disabled";
4039                 if (conn->allow_signing) {
4040                         client_signing = "allowed";
4041                 }
4042                 if (conn->mandatory_signing) {
4043                         client_signing = "required";
4044                 }
4045
4046                 server_signing = "not supported";
4047                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
4048                         server_signing = "supported";
4049                         server_allowed = true;
4050                 } else if (conn->mandatory_signing) {
4051                         /*
4052                          * We have mandatory signing as client
4053                          * lets assume the server will look at our
4054                          * FLAGS2_SMB_SECURITY_SIGNATURES_REQUIRED
4055                          * flag in the session setup
4056                          */
4057                         server_signing = "not announced";
4058                         server_allowed = true;
4059                 }
4060                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
4061                         server_signing = "required";
4062                         server_mandatory = true;
4063                 }
4064
4065                 ok = smb_signing_set_negotiated(conn->smb1.signing,
4066                                                 server_allowed,
4067                                                 server_mandatory);
4068                 if (!ok) {
4069                         DEBUG(1,("cli_negprot: SMB signing is required, "
4070                                  "but client[%s] and server[%s] mismatch\n",
4071                                  client_signing, server_signing));
4072                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
4073                         return;
4074                 }
4075
4076         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
4077                 DATA_BLOB blob1;
4078                 uint8_t key_len;
4079                 time_t t;
4080
4081                 if (wct != 0x0D) {
4082                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4083                         return;
4084                 }
4085
4086                 server_security_mode = SVAL(vwv + 1, 0);
4087                 server_max_xmit = SVAL(vwv + 2, 0);
4088                 server_max_mux = SVAL(vwv + 3, 0);
4089                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
4090                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
4091                 server_session_key = IVAL(vwv + 6, 0);
4092                 server_time_zone = SVALS(vwv + 10, 0);
4093                 server_time_zone *= 60;
4094                 /* this time is converted to GMT by make_unix_date */
4095                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
4096                 unix_to_nt_time(&server_system_time, t);
4097                 key_len = SVAL(vwv + 11, 0);
4098
4099                 if (num_bytes < key_len) {
4100                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4101                         return;
4102                 }
4103
4104                 if (key_len != 0 && key_len != 8) {
4105                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4106                         return;
4107                 }
4108
4109                 if (key_len == 8) {
4110                         memcpy(server_challenge, bytes, 8);
4111                 }
4112
4113                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
4114                 if (blob1.length > 0) {
4115                         size_t len;
4116                         bool ok;
4117
4118                         len = utf16_len_n(blob1.data,
4119                                           blob1.length);
4120                         blob1.length = len;
4121
4122                         ok = convert_string_talloc(state,
4123                                                    CH_DOS,
4124                                                    CH_UNIX,
4125                                                    blob1.data,
4126                                                    blob1.length,
4127                                                    &server_workgroup,
4128                                                    &len);
4129                         if (!ok) {
4130                                 status = map_nt_error_from_unix_common(errno);
4131                                 tevent_req_nterror(req, status);
4132                                 return;
4133                         }
4134                 }
4135
4136         } else {
4137                 /* the old core protocol */
4138                 server_time_zone = get_time_zone(time(NULL));
4139                 server_max_xmit = 1024;
4140                 server_max_mux = 1;
4141         }
4142
4143         if (server_max_xmit < 1024) {
4144                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4145                 return;
4146         }
4147
4148         if (server_max_mux < 1) {
4149                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4150                 return;
4151         }
4152
4153         /*
4154          * Now calculate the negotiated capabilities
4155          * based on the mask for:
4156          * - client only flags
4157          * - flags used in both directions
4158          * - server only flags
4159          */
4160         both_capabilities = client_capabilities & server_capabilities;
4161         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
4162         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
4163         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
4164
4165         max_xmit = MIN(client_max_xmit, server_max_xmit);
4166
4167         conn->smb1.server.capabilities = server_capabilities;
4168         conn->smb1.capabilities = capabilities;
4169
4170         conn->smb1.server.max_xmit = server_max_xmit;
4171         conn->smb1.max_xmit = max_xmit;
4172
4173         conn->smb1.server.max_mux = server_max_mux;
4174
4175         conn->smb1.server.security_mode = server_security_mode;
4176
4177         conn->smb1.server.readbraw = server_readbraw;
4178         conn->smb1.server.writebraw = server_writebraw;
4179         conn->smb1.server.lockread = server_lockread;
4180         conn->smb1.server.writeunlock = server_writeunlock;
4181
4182         conn->smb1.server.session_key = server_session_key;
4183
4184         talloc_steal(conn, server_gss_blob.data);
4185         conn->smb1.server.gss_blob = server_gss_blob;
4186         conn->smb1.server.guid = server_guid;
4187         memcpy(conn->smb1.server.challenge, server_challenge, 8);
4188         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
4189         conn->smb1.server.name = talloc_move(conn, &server_name);
4190
4191         conn->smb1.server.time_zone = server_time_zone;
4192         conn->smb1.server.system_time = server_system_time;
4193
4194         tevent_req_done(req);
4195 }
4196
4197 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
4198 {
4199         size_t i;
4200         uint8_t *buf;
4201         uint16_t dialect_count = 0;
4202
4203         buf = state->smb2.dyn;
4204         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4205                 if (smb2cli_prots[i].proto < state->min_protocol) {
4206                         continue;
4207                 }
4208
4209                 if (smb2cli_prots[i].proto > state->max_protocol) {
4210                         continue;
4211                 }
4212
4213                 SSVAL(buf, dialect_count*2, smb2cli_prots[i].smb2_dialect);
4214                 dialect_count++;
4215         }
4216
4217         buf = state->smb2.fixed;
4218         SSVAL(buf, 0, 36);
4219         SSVAL(buf, 2, dialect_count);
4220         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
4221         SSVAL(buf, 6, 0);       /* Reserved */
4222         if (state->max_protocol >= PROTOCOL_SMB2_22) {
4223                 SIVAL(buf, 8, state->conn->smb2.client.capabilities);
4224         } else {
4225                 SIVAL(buf, 8, 0);       /* Capabilities */
4226         }
4227         if (state->max_protocol >= PROTOCOL_SMB2_10) {
4228                 NTSTATUS status;
4229                 DATA_BLOB blob;
4230
4231                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
4232                                           state, &blob);
4233                 if (!NT_STATUS_IS_OK(status)) {
4234                         return NULL;
4235                 }
4236                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
4237         } else {
4238                 memset(buf+12, 0, 16);  /* ClientGuid */
4239         }
4240         SBVAL(buf, 28, 0);      /* ClientStartTime */
4241
4242         return smb2cli_req_send(state, state->ev,
4243                                 state->conn, SMB2_OP_NEGPROT,
4244                                 0, 0, /* flags */
4245                                 state->timeout_msec,
4246                                 NULL, NULL, /* tcon, session */
4247                                 state->smb2.fixed, sizeof(state->smb2.fixed),
4248                                 state->smb2.dyn, dialect_count*2);
4249 }
4250
4251 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
4252 {
4253         struct tevent_req *req =
4254                 tevent_req_callback_data(subreq,
4255                 struct tevent_req);
4256         struct smbXcli_negprot_state *state =
4257                 tevent_req_data(req,
4258                 struct smbXcli_negprot_state);
4259         struct smbXcli_conn *conn = state->conn;
4260         size_t security_offset, security_length;
4261         DATA_BLOB blob;
4262         NTSTATUS status;
4263         struct iovec *iov;
4264         uint8_t *body;
4265         size_t i;
4266         uint16_t dialect_revision;
4267         static const struct smb2cli_req_expected_response expected[] = {
4268         {
4269                 .status = NT_STATUS_OK,
4270                 .body_size = 0x41
4271         }
4272         };
4273
4274         status = smb2cli_req_recv(subreq, state, &iov,
4275                                   expected, ARRAY_SIZE(expected));
4276         TALLOC_FREE(subreq);
4277         if (tevent_req_nterror(req, status)) {
4278                 return;
4279         }
4280
4281         body = (uint8_t *)iov[1].iov_base;
4282
4283         dialect_revision = SVAL(body, 4);
4284
4285         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
4286                 if (smb2cli_prots[i].proto < state->min_protocol) {
4287                         continue;
4288                 }
4289
4290                 if (smb2cli_prots[i].proto > state->max_protocol) {
4291                         continue;
4292                 }
4293
4294                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
4295                         continue;
4296                 }
4297
4298                 conn->protocol = smb2cli_prots[i].proto;
4299                 break;
4300         }
4301
4302         if (conn->protocol == PROTOCOL_NONE) {
4303                 if (state->min_protocol >= PROTOCOL_SMB2_02) {
4304                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4305                         return;
4306                 }
4307
4308                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
4309                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4310                         return;
4311                 }
4312
4313                 /* make sure we do not loop forever */
4314                 state->min_protocol = PROTOCOL_SMB2_02;
4315
4316                 /*
4317                  * send a SMB2 negprot, in order to negotiate
4318                  * the SMB2 dialect.
4319                  */
4320                 subreq = smbXcli_negprot_smb2_subreq(state);
4321                 if (tevent_req_nomem(subreq, req)) {
4322                         return;
4323                 }
4324                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4325                 return;
4326         }
4327
4328         conn->smb2.server.security_mode = SVAL(body, 2);
4329
4330         blob = data_blob_const(body + 8, 16);
4331         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
4332         if (tevent_req_nterror(req, status)) {
4333                 return;
4334         }
4335
4336         conn->smb2.server.capabilities  = IVAL(body, 24);
4337         conn->smb2.server.max_trans_size= IVAL(body, 28);
4338         conn->smb2.server.max_read_size = IVAL(body, 32);
4339         conn->smb2.server.max_write_size= IVAL(body, 36);
4340         conn->smb2.server.system_time   = BVAL(body, 40);
4341         conn->smb2.server.start_time    = BVAL(body, 48);
4342
4343         security_offset = SVAL(body, 56);
4344         security_length = SVAL(body, 58);
4345
4346         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
4347                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4348                 return;
4349         }
4350
4351         if (security_length > iov[2].iov_len) {
4352                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
4353                 return;
4354         }
4355
4356         conn->smb2.server.gss_blob = data_blob_talloc(conn,
4357                                                 iov[2].iov_base,
4358                                                 security_length);
4359         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
4360                 return;
4361         }
4362
4363         tevent_req_done(req);
4364 }
4365
4366 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
4367                                                   TALLOC_CTX *tmp_mem,
4368                                                   uint8_t *inbuf)
4369 {
4370         size_t num_pending = talloc_array_length(conn->pending);
4371         struct tevent_req *subreq;
4372         struct smbXcli_req_state *substate;
4373         struct tevent_req *req;
4374         uint32_t protocol_magic;
4375         size_t inbuf_len = smb_len_nbt(inbuf);
4376
4377         if (num_pending != 1) {
4378                 return NT_STATUS_INTERNAL_ERROR;
4379         }
4380
4381         if (inbuf_len < 4) {
4382                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
4383         }
4384
4385         subreq = conn->pending[0];
4386         substate = tevent_req_data(subreq, struct smbXcli_req_state);
4387         req = tevent_req_callback_data(subreq, struct tevent_req);
4388
4389         protocol_magic = IVAL(inbuf, 4);
4390
4391         switch (protocol_magic) {
4392         case SMB_MAGIC:
4393                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
4394                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
4395                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4396
4397         case SMB2_MAGIC:
4398                 if (substate->smb2.recv_iov == NULL) {
4399                         /*
4400                          * For the SMB1 negprot we have move it.
4401                          */
4402                         substate->smb2.recv_iov = substate->smb1.recv_iov;
4403                         substate->smb1.recv_iov = NULL;
4404                 }
4405
4406                 /*
4407                  * we got an SMB2 answer, which consumed sequence number 0
4408                  * so we need to use 1 as the next one
4409                  */
4410                 conn->smb2.mid = 1;
4411                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
4412                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
4413                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
4414         }
4415
4416         DEBUG(10, ("Got non-SMB PDU\n"));
4417         return NT_STATUS_INVALID_NETWORK_RESPONSE;
4418 }
4419
4420 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
4421 {
4422         return tevent_req_simple_recv_ntstatus(req);
4423 }
4424
4425 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
4426                          uint32_t timeout_msec,
4427                          enum protocol_types min_protocol,
4428                          enum protocol_types max_protocol)
4429 {
4430         TALLOC_CTX *frame = talloc_stackframe();
4431         struct tevent_context *ev;
4432         struct tevent_req *req;
4433         NTSTATUS status = NT_STATUS_NO_MEMORY;
4434         bool ok;
4435
4436         if (smbXcli_conn_has_async_calls(conn)) {
4437                 /*
4438                  * Can't use sync call while an async call is in flight
4439                  */
4440                 status = NT_STATUS_INVALID_PARAMETER_MIX;
4441                 goto fail;
4442         }
4443         ev = samba_tevent_context_init(frame);
4444         if (ev == NULL) {
4445                 goto fail;
4446         }
4447         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
4448                                    min_protocol, max_protocol);
4449         if (req == NULL) {
4450                 goto fail;
4451         }
4452         ok = tevent_req_poll(req, ev);
4453         if (!ok) {
4454                 status = map_nt_error_from_unix_common(errno);
4455                 goto fail;
4456         }
4457         status = smbXcli_negprot_recv(req);
4458  fail:
4459         TALLOC_FREE(frame);
4460         return status;
4461 }
4462
4463 static int smbXcli_session_destructor(struct smbXcli_session *session)
4464 {
4465         if (session->conn == NULL) {
4466                 return 0;
4467         }
4468
4469         DLIST_REMOVE(session->conn->sessions, session);
4470         return 0;
4471 }
4472
4473 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
4474                                                struct smbXcli_conn *conn)
4475 {
4476         struct smbXcli_session *session;
4477
4478         session = talloc_zero(mem_ctx, struct smbXcli_session);
4479         if (session == NULL) {
4480                 return NULL;
4481         }
4482         session->smb2 = talloc_zero(session, struct smb2cli_session);
4483         if (session->smb2 == NULL) {
4484                 talloc_free(session);
4485                 return NULL;
4486         }
4487         talloc_set_destructor(session, smbXcli_session_destructor);
4488
4489         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
4490         session->conn = conn;
4491
4492         return session;
4493 }
4494
4495 struct smbXcli_session *smbXcli_session_copy(TALLOC_CTX *mem_ctx,
4496                                                 struct smbXcli_session *src)
4497 {
4498         struct smbXcli_session *session;
4499
4500         session = talloc_zero(mem_ctx, struct smbXcli_session);
4501         if (session == NULL) {
4502                 return NULL;
4503         }
4504         session->smb2 = talloc_zero(session, struct smb2cli_session);
4505         if (session->smb2 == NULL) {
4506                 talloc_free(session);
4507                 return NULL;
4508         }
4509
4510         session->conn = src->conn;
4511         *session->smb2 = *src->smb2;
4512         session->smb2_channel = src->smb2_channel;
4513         session->disconnect_expired = src->disconnect_expired;
4514
4515         DLIST_ADD_END(src->conn->sessions, session, struct smbXcli_session *);
4516         talloc_set_destructor(session, smbXcli_session_destructor);
4517
4518         return session;
4519 }
4520
4521
4522 NTSTATUS smbXcli_session_application_key(struct smbXcli_session *session,
4523                                          TALLOC_CTX *mem_ctx,
4524                                          DATA_BLOB *key)
4525 {
4526         const DATA_BLOB *application_key;
4527
4528         *key = data_blob_null;
4529
4530         if (session->conn == NULL) {
4531                 return NT_STATUS_NO_USER_SESSION_KEY;
4532         }
4533
4534         if (session->conn->protocol >= PROTOCOL_SMB2_02) {
4535                 application_key = &session->smb2->application_key;
4536         } else {
4537                 application_key = &session->smb1.application_key;
4538         }
4539
4540         if (application_key->length == 0) {
4541                 return NT_STATUS_NO_USER_SESSION_KEY;
4542         }
4543
4544         *key = data_blob_dup_talloc(mem_ctx, *application_key);
4545         if (key->data == NULL) {
4546                 return NT_STATUS_NO_MEMORY;
4547         }
4548
4549         return NT_STATUS_OK;
4550 }
4551
4552 void smbXcli_session_set_disconnect_expired(struct smbXcli_session *session)
4553 {
4554         session->disconnect_expired = true;
4555 }
4556
4557 uint16_t smb1cli_session_current_id(struct smbXcli_session *session)
4558 {
4559         return session->smb1.session_id;
4560 }
4561
4562 void smb1cli_session_set_id(struct smbXcli_session *session,
4563                             uint16_t session_id)
4564 {
4565         session->smb1.session_id = session_id;
4566 }
4567
4568 NTSTATUS smb1cli_session_set_session_key(struct smbXcli_session *session,
4569                                          const DATA_BLOB _session_key)
4570 {
4571         struct smbXcli_conn *conn = session->conn;
4572         uint8_t session_key[16];
4573
4574         if (conn == NULL) {
4575                 return NT_STATUS_INVALID_PARAMETER_MIX;
4576         }
4577
4578         if (session->smb1.application_key.length != 0) {
4579                 /*
4580                  * TODO: do not allow this...
4581                  *
4582                  * return NT_STATUS_INVALID_PARAMETER_MIX;
4583                  */
4584                 data_blob_clear_free(&session->smb1.application_key);
4585                 session->smb1.protected_key = false;
4586         }
4587
4588         if (_session_key.length == 0) {
4589                 return NT_STATUS_OK;
4590         }
4591
4592         ZERO_STRUCT(session_key);
4593         memcpy(session_key, _session_key.data,
4594                MIN(_session_key.length, sizeof(session_key)));
4595
4596         session->smb1.application_key = data_blob_talloc(session,
4597                                                          session_key,
4598                                                          sizeof(session_key));
4599         ZERO_STRUCT(session_key);
4600         if (session->smb1.application_key.data == NULL) {
4601                 return NT_STATUS_NO_MEMORY;
4602         }
4603
4604         session->smb1.protected_key = false;
4605
4606         return NT_STATUS_OK;
4607 }
4608
4609 NTSTATUS smb1cli_session_protect_session_key(struct smbXcli_session *session)
4610 {
4611         if (session->smb1.protected_key) {
4612                 /* already protected */
4613                 return NT_STATUS_OK;
4614         }
4615
4616         if (session->smb1.application_key.length != 16) {
4617                 return NT_STATUS_INVALID_PARAMETER_MIX;
4618         }
4619
4620         smb_key_derivation(session->smb1.application_key.data,
4621                            session->smb1.application_key.length,
4622                            session->smb1.application_key.data);
4623
4624         session->smb1.protected_key = true;
4625
4626         return NT_STATUS_OK;
4627 }
4628
4629 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
4630 {
4631         struct smbXcli_conn *conn = session->conn;
4632         uint8_t security_mode = 0;
4633
4634         if (conn == NULL) {
4635                 return security_mode;
4636         }
4637
4638         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
4639         if (conn->mandatory_signing) {
4640                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
4641         }
4642
4643         return security_mode;
4644 }
4645
4646 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
4647 {
4648         return session->smb2->session_id;
4649 }
4650
4651 uint16_t smb2cli_session_get_flags(struct smbXcli_session *session)
4652 {
4653         return session->smb2->session_flags;
4654 }
4655
4656 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
4657                                       uint64_t session_id,
4658                                       uint16_t session_flags)
4659 {
4660         session->smb2->session_id = session_id;
4661         session->smb2->session_flags = session_flags;
4662 }
4663
4664 void smb2cli_session_increment_channel_sequence(struct smbXcli_session *session)
4665 {
4666         session->smb2->channel_sequence += 1;
4667 }
4668
4669 NTSTATUS smb2cli_session_set_session_key(struct smbXcli_session *session,
4670                                          const DATA_BLOB _session_key,
4671                                          const struct iovec *recv_iov)
4672 {
4673         struct smbXcli_conn *conn = session->conn;
4674         uint16_t no_sign_flags;
4675         uint8_t session_key[16];
4676         NTSTATUS status;
4677
4678         if (conn == NULL) {
4679                 return NT_STATUS_INVALID_PARAMETER_MIX;
4680         }
4681
4682         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
4683
4684         if (session->smb2->session_flags & no_sign_flags) {
4685                 session->smb2->should_sign = false;
4686                 return NT_STATUS_OK;
4687         }
4688
4689         if (session->smb2->signing_key.length != 0) {
4690                 return NT_STATUS_INVALID_PARAMETER_MIX;
4691         }
4692
4693         ZERO_STRUCT(session_key);
4694         memcpy(session_key, _session_key.data,
4695                MIN(_session_key.length, sizeof(session_key)));
4696
4697         session->smb2->signing_key = data_blob_talloc(session,
4698                                                      session_key,
4699                                                      sizeof(session_key));
4700         if (session->smb2->signing_key.data == NULL) {
4701                 ZERO_STRUCT(session_key);
4702                 return NT_STATUS_NO_MEMORY;
4703         }
4704
4705         if (conn->protocol >= PROTOCOL_SMB2_24) {
4706                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
4707                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
4708
4709                 smb2_key_derivation(session_key, sizeof(session_key),
4710                                     label.data, label.length,
4711                                     context.data, context.length,
4712                                     session->smb2->signing_key.data);
4713         }
4714
4715         session->smb2->encryption_key = data_blob_dup_talloc(session,
4716                                                 session->smb2->signing_key);
4717         if (session->smb2->encryption_key.data == NULL) {
4718                 ZERO_STRUCT(session_key);
4719                 return NT_STATUS_NO_MEMORY;
4720         }
4721
4722         if (conn->protocol >= PROTOCOL_SMB2_24) {
4723                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
4724                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
4725
4726                 smb2_key_derivation(session_key, sizeof(session_key),
4727                                     label.data, label.length,
4728                                     context.data, context.length,
4729                                     session->smb2->encryption_key.data);
4730         }
4731
4732         session->smb2->decryption_key = data_blob_dup_talloc(session,
4733                                                 session->smb2->signing_key);
4734         if (session->smb2->decryption_key.data == NULL) {
4735                 ZERO_STRUCT(session_key);
4736                 return NT_STATUS_NO_MEMORY;
4737         }
4738
4739         if (conn->protocol >= PROTOCOL_SMB2_24) {
4740                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
4741                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
4742
4743                 smb2_key_derivation(session_key, sizeof(session_key),
4744                                     label.data, label.length,
4745                                     context.data, context.length,
4746                                     session->smb2->decryption_key.data);
4747         }
4748
4749         session->smb2->application_key = data_blob_dup_talloc(session,
4750                                                 session->smb2->signing_key);
4751         if (session->smb2->application_key.data == NULL) {
4752                 ZERO_STRUCT(session_key);
4753                 return NT_STATUS_NO_MEMORY;
4754         }
4755
4756         if (conn->protocol >= PROTOCOL_SMB2_24) {
4757                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
4758                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
4759
4760                 smb2_key_derivation(session_key, sizeof(session_key),
4761                                     label.data, label.length,
4762                                     context.data, context.length,
4763                                     session->smb2->application_key.data);
4764         }
4765         ZERO_STRUCT(session_key);
4766
4767         session->smb2_channel.signing_key = data_blob_dup_talloc(session,
4768                                                 session->smb2->signing_key);
4769         if (session->smb2_channel.signing_key.data == NULL) {
4770                 return NT_STATUS_NO_MEMORY;
4771         }
4772
4773         status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
4774                                         session->conn->protocol,
4775                                         recv_iov, 3);
4776         if (!NT_STATUS_IS_OK(status)) {
4777                 return status;
4778         }
4779
4780         session->smb2->should_sign = false;
4781         session->smb2->should_encrypt = false;
4782
4783         if (conn->desire_signing) {
4784                 session->smb2->should_sign = true;
4785         }
4786
4787         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
4788                 session->smb2->should_sign = true;
4789         }
4790
4791         if (session->smb2->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
4792                 session->smb2->should_encrypt = true;
4793         }
4794
4795         if (conn->protocol < PROTOCOL_SMB2_24) {
4796                 session->smb2->should_encrypt = false;
4797         }
4798
4799         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
4800                 session->smb2->should_encrypt = false;
4801         }
4802
4803         generate_random_buffer((uint8_t *)&session->smb2->nonce_high,
4804                                sizeof(session->smb2->nonce_high));
4805         session->smb2->nonce_low = 1;
4806
4807         return NT_STATUS_OK;
4808 }
4809
4810 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
4811                                         struct smbXcli_session *session1,
4812                                         struct smbXcli_conn *conn,
4813                                         struct smbXcli_session **_session2)
4814 {
4815         struct smbXcli_session *session2;
4816
4817         if (session1->smb2->signing_key.length == 0) {
4818                 return NT_STATUS_INVALID_PARAMETER_MIX;
4819         }
4820
4821         if (conn == NULL) {
4822                 return NT_STATUS_INVALID_PARAMETER_MIX;
4823         }
4824
4825         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
4826         if (session2 == NULL) {
4827                 return NT_STATUS_NO_MEMORY;
4828         }
4829         session2->smb2 = talloc_reference(session2, session1->smb2);
4830         if (session2->smb2 == NULL) {
4831                 talloc_free(session2);
4832                 return NT_STATUS_NO_MEMORY;
4833         }
4834
4835         talloc_set_destructor(session2, smbXcli_session_destructor);
4836         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
4837         session2->conn = conn;
4838
4839         *_session2 = session2;
4840         return NT_STATUS_OK;
4841 }
4842
4843 NTSTATUS smb2cli_session_set_channel_key(struct smbXcli_session *session,
4844                                          const DATA_BLOB _channel_key,
4845                                          const struct iovec *recv_iov)
4846 {
4847         struct smbXcli_conn *conn = session->conn;
4848         uint8_t channel_key[16];
4849         NTSTATUS status;
4850
4851         if (conn == NULL) {
4852                 return NT_STATUS_INVALID_PARAMETER_MIX;
4853         }
4854
4855         if (session->smb2_channel.signing_key.length != 0) {
4856                 return NT_STATUS_INVALID_PARAMETER_MIX;
4857         }
4858
4859         ZERO_STRUCT(channel_key);
4860         memcpy(channel_key, _channel_key.data,
4861                MIN(_channel_key.length, sizeof(channel_key)));
4862
4863         session->smb2_channel.signing_key = data_blob_talloc(session,
4864                                                 channel_key,
4865                                                 sizeof(channel_key));
4866         if (session->smb2_channel.signing_key.data == NULL) {
4867                 ZERO_STRUCT(channel_key);
4868                 return NT_STATUS_NO_MEMORY;
4869         }
4870
4871         if (conn->protocol >= PROTOCOL_SMB2_24) {
4872                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
4873                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
4874
4875                 smb2_key_derivation(channel_key, sizeof(channel_key),
4876                                     label.data, label.length,
4877                                     context.data, context.length,
4878                                     session->smb2_channel.signing_key.data);
4879         }
4880         ZERO_STRUCT(channel_key);
4881
4882         status = smb2_signing_check_pdu(session->smb2_channel.signing_key,
4883                                         session->conn->protocol,
4884                                         recv_iov, 3);
4885         if (!NT_STATUS_IS_OK(status)) {
4886                 return status;
4887         }
4888
4889         return NT_STATUS_OK;
4890 }
4891
4892 struct smbXcli_tcon *smbXcli_tcon_create(TALLOC_CTX *mem_ctx)
4893 {
4894         struct smbXcli_tcon *tcon;
4895
4896         tcon = talloc_zero(mem_ctx, struct smbXcli_tcon);
4897         if (tcon == NULL) {
4898                 return NULL;
4899         }
4900
4901         return tcon;
4902 }
4903
4904 uint16_t smb1cli_tcon_current_id(struct smbXcli_tcon *tcon)
4905 {
4906         return tcon->smb1.tcon_id;
4907 }
4908
4909 void smb1cli_tcon_set_id(struct smbXcli_tcon *tcon, uint16_t tcon_id)
4910 {
4911         tcon->smb1.tcon_id = tcon_id;
4912 }
4913
4914 bool smb1cli_tcon_set_values(struct smbXcli_tcon *tcon,
4915                              uint16_t tcon_id,
4916                              uint16_t optional_support,
4917                              uint32_t maximal_access,
4918                              uint32_t guest_maximal_access,
4919                              const char *service,
4920                              const char *fs_type)
4921 {
4922         tcon->smb1.tcon_id = tcon_id;
4923         tcon->smb1.optional_support = optional_support;
4924         tcon->smb1.maximal_access = maximal_access;
4925         tcon->smb1.guest_maximal_access = guest_maximal_access;
4926
4927         TALLOC_FREE(tcon->smb1.service);
4928         tcon->smb1.service = talloc_strdup(tcon, service);
4929         if (service != NULL && tcon->smb1.service == NULL) {
4930                 return false;
4931         }
4932
4933         TALLOC_FREE(tcon->smb1.fs_type);
4934         tcon->smb1.fs_type = talloc_strdup(tcon, fs_type);
4935         if (fs_type != NULL && tcon->smb1.fs_type == NULL) {
4936                 return false;
4937         }
4938
4939         return true;
4940 }
4941
4942 uint32_t smb2cli_tcon_current_id(struct smbXcli_tcon *tcon)
4943 {
4944         return tcon->smb2.tcon_id;
4945 }
4946
4947 uint32_t smb2cli_tcon_capabilities(struct smbXcli_tcon *tcon)
4948 {
4949         return tcon->smb2.capabilities;
4950 }
4951
4952 void smb2cli_tcon_set_values(struct smbXcli_tcon *tcon,
4953                              struct smbXcli_session *session,
4954                              uint32_t tcon_id,
4955                              uint8_t type,
4956                              uint32_t flags,
4957                              uint32_t capabilities,
4958                              uint32_t maximal_access)
4959 {
4960         tcon->smb2.tcon_id = tcon_id;
4961         tcon->smb2.type = type;
4962         tcon->smb2.flags = flags;
4963         tcon->smb2.capabilities = capabilities;
4964         tcon->smb2.maximal_access = maximal_access;
4965
4966         tcon->smb2.should_encrypt = false;
4967
4968         if (session == NULL) {
4969                 return;
4970         }
4971
4972         tcon->smb2.should_encrypt = session->smb2->should_encrypt;
4973
4974         if (flags & SMB2_SHAREFLAG_ENCRYPT_DATA) {
4975                 tcon->smb2.should_encrypt = true;
4976         }
4977 }