libcli/smb/smbXcli_base.c

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