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
  39 struct smbXcli_conn {
  40         int read_fd;
  41         int write_fd;
  42         struct sockaddr_storage local_ss;
  43         struct sockaddr_storage remote_ss;
  44         const char *remote_name;
  45
  46         struct tevent_queue *outgoing;
  47         struct tevent_req **pending;
  48         struct tevent_req *read_smb_req;
  49
  50         enum protocol_types protocol;
  51         bool allow_signing;
  52         bool desire_signing;
  53         bool mandatory_signing;
  54
  55         /*
  56          * The incoming dispatch function should return:
  57          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
  58          * - NT_STATUS_OK, if no more processing is desired, e.g.
  59          *                 the dispatch function called
  60          *                 tevent_req_done().
  61          * - All other return values disconnect the connection.
  62          */
  63         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
  64                                       TALLOC_CTX *tmp_mem,
  65                                       uint8_t *inbuf);
  66
  67         struct {
  68                 struct {
  69                         uint32_t capabilities;
  70                         uint32_t max_xmit;
  71                 } client;
  72
  73                 struct {
  74                         uint32_t capabilities;
  75                         uint32_t max_xmit;
  76                         uint16_t max_mux;
  77                         uint16_t security_mode;
  78                         bool readbraw;
  79                         bool writebraw;
  80                         bool lockread;
  81                         bool writeunlock;
  82                         uint32_t session_key;
  83                         struct GUID guid;
  84                         DATA_BLOB gss_blob;
  85                         uint8_t challenge[8];
  86                         const char *workgroup;
  87                         const char *name;
  88                         int time_zone;
  89                         NTTIME system_time;
  90                 } server;
  91
  92                 uint32_t capabilities;
  93                 uint32_t max_xmit;
  94
  95                 uint16_t mid;
  96
  97                 struct smb_signing_state *signing;
  98                 struct smb_trans_enc_state *trans_enc;
  99
 100                 struct tevent_req *read_braw_req;
 101         } smb1;
 102
 103         struct {
 104                 struct {
 105                         uint16_t security_mode;
 106                         struct GUID guid;
 107                 } client;
 108
 109                 struct {
 110                         uint32_t capabilities;
 111                         uint16_t security_mode;
 112                         struct GUID guid;
 113                         uint32_t max_trans_size;
 114                         uint32_t max_read_size;
 115                         uint32_t max_write_size;
 116                         NTTIME system_time;
 117                         NTTIME start_time;
 118                         DATA_BLOB gss_blob;
 119                 } server;
 120
 121                 uint64_t mid;
 122                 uint16_t cur_credits;
 123                 uint16_t max_credits;
 124         } smb2;
 125
 126         struct smbXcli_session *sessions;
 127 };
 128
 129 struct smbXcli_session {
 130         struct smbXcli_session *prev, *next;
 131         struct smbXcli_conn *conn;
 132
 133         struct {
 134                 uint64_t session_id;
 135                 uint16_t session_flags;
 136                 DATA_BLOB signing_key;
 137                 DATA_BLOB session_key;
 138                 bool should_sign;
 139                 bool channel_setup;
 140         } smb2;
 141 };
 142
 143 struct smbXcli_req_state {
 144         struct tevent_context *ev;
 145         struct smbXcli_conn *conn;
 146         struct smbXcli_session *session; /* maybe NULL */
 147
 148         uint8_t length_hdr[4];
 149
 150         bool one_way;
 151
 152         uint8_t *inbuf;
 153
 154         struct {
 155                 /* Space for the header including the wct */
 156                 uint8_t hdr[HDR_VWV];
 157
 158                 /*
 159                  * For normal requests, smb1cli_req_send chooses a mid.
 160                  * SecondaryV trans requests need to use the mid of the primary
 161                  * request, so we need a place to store it.
 162                  * Assume it is set if != 0.
 163                  */
 164                 uint16_t mid;
 165
 166                 uint16_t *vwv;
 167                 uint8_t bytecount_buf[2];
 168
 169 #define MAX_SMB_IOV 10
 170                 /* length_hdr, hdr, words, byte_count, buffers */
 171                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 172                 int iov_count;
 173
 174                 bool one_way_seqnum;
 175                 uint32_t seqnum;
 176                 struct tevent_req **chained_requests;
 177
 178                 uint8_t recv_cmd;
 179                 NTSTATUS recv_status;
 180                 /* always an array of 3 talloc elements */
 181                 struct iovec *recv_iov;
 182         } smb1;
 183
 184         struct {
 185                 const uint8_t *fixed;
 186                 uint16_t fixed_len;
 187                 const uint8_t *dyn;
 188                 uint32_t dyn_len;
 189
 190                 uint8_t hdr[64];
 191                 uint8_t pad[7]; /* padding space for compounding */
 192
 193                 /* always an array of 3 talloc elements */
 194                 struct iovec *recv_iov;
 195
 196                 uint16_t credit_charge;
 197
 198                 bool signing_skipped;
 199                 bool notify_async;
 200                 bool got_async;
 201         } smb2;
 202 };
 203
 204 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 205 {
 206         /*
 207          * NT_STATUS_OK, means we do not notify the callers
 208          */
 209         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 210
 211         while (conn->sessions) {
 212                 conn->sessions->conn = NULL;
 213                 DLIST_REMOVE(conn->sessions, conn->sessions);
 214         }
 215
 216         if (conn->smb1.trans_enc) {
 217                 common_free_encryption_state(&conn->smb1.trans_enc);
 218         }
 219
 220         return 0;
 221 }
 222
 223 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 224                                          int fd,
 225                                          const char *remote_name,
 226                                          enum smb_signing_setting signing_state,
 227                                          uint32_t smb1_capabilities,
 228                                          struct GUID *client_guid)
 229 {
 230         struct smbXcli_conn *conn = NULL;
 231         void *ss = NULL;
 232         struct sockaddr *sa = NULL;
 233         socklen_t sa_length;
 234         int ret;
 235
 236         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 237         if (!conn) {
 238                 return NULL;
 239         }
 240
 241         conn->read_fd = fd;
 242         conn->write_fd = dup(fd);
 243         if (conn->write_fd == -1) {
 244                 goto error;
 245         }
 246
 247         conn->remote_name = talloc_strdup(conn, remote_name);
 248         if (conn->remote_name == NULL) {
 249                 goto error;
 250         }
 251
 252
 253         ss = (void *)&conn->local_ss;
 254         sa = (struct sockaddr *)ss;
 255         sa_length = sizeof(conn->local_ss);
 256         ret = getsockname(fd, sa, &sa_length);
 257         if (ret == -1) {
 258                 goto error;
 259         }
 260         ss = (void *)&conn->remote_ss;
 261         sa = (struct sockaddr *)ss;
 262         sa_length = sizeof(conn->remote_ss);
 263         ret = getpeername(fd, sa, &sa_length);
 264         if (ret == -1) {
 265                 goto error;
 266         }
 267
 268         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 269         if (conn->outgoing == NULL) {
 270                 goto error;
 271         }
 272         conn->pending = NULL;
 273
 274         conn->protocol = PROTOCOL_NONE;
 275
 276         switch (signing_state) {
 277         case SMB_SIGNING_OFF:
 278                 /* never */
 279                 conn->allow_signing = false;
 280                 conn->desire_signing = false;
 281                 conn->mandatory_signing = false;
 282                 break;
 283         case SMB_SIGNING_DEFAULT:
 284         case SMB_SIGNING_IF_REQUIRED:
 285                 /* if the server requires it */
 286                 conn->allow_signing = true;
 287                 conn->desire_signing = false;
 288                 conn->mandatory_signing = false;
 289                 break;
 290         case SMB_SIGNING_REQUIRED:
 291                 /* always */
 292                 conn->allow_signing = true;
 293                 conn->desire_signing = true;
 294                 conn->mandatory_signing = true;
 295                 break;
 296         }
 297
 298         conn->smb1.client.capabilities = smb1_capabilities;
 299         conn->smb1.client.max_xmit = UINT16_MAX;
 300
 301         conn->smb1.capabilities = conn->smb1.client.capabilities;
 302         conn->smb1.max_xmit = 1024;
 303
 304         conn->smb1.mid = 1;
 305
 306         /* initialise signing */
 307         conn->smb1.signing = smb_signing_init(conn,
 308                                               conn->allow_signing,
 309                                               conn->desire_signing,
 310                                               conn->mandatory_signing);
 311         if (!conn->smb1.signing) {
 312                 goto error;
 313         }
 314
 315         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 316         if (conn->mandatory_signing) {
 317                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 318         }
 319         if (client_guid) {
 320                 conn->smb2.client.guid = *client_guid;
 321         }
 322
 323         conn->smb2.cur_credits = 1;
 324         conn->smb2.max_credits = 0;
 325
 326         talloc_set_destructor(conn, smbXcli_conn_destructor);
 327         return conn;
 328
 329  error:
 330         if (conn->write_fd != -1) {
 331                 close(conn->write_fd);
 332         }
 333         TALLOC_FREE(conn);
 334         return NULL;
 335 }
 336
 337 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 338 {
 339         if (conn == NULL) {
 340                 return false;
 341         }
 342
 343         if (conn->read_fd == -1) {
 344                 return false;
 345         }
 346
 347         return true;
 348 }
 349
 350 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 351 {
 352         return conn->protocol;
 353 }
 354
 355 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 356 {
 357         if (conn->protocol >= PROTOCOL_SMB2_02) {
 358                 return true;
 359         }
 360
 361         if (conn->smb1.capabilities & CAP_UNICODE) {
 362                 return true;
 363         }
 364
 365         return false;
 366 }
 367
 368 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 369 {
 370         set_socket_options(conn->read_fd, options);
 371 }
 372
 373 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 374 {
 375         return &conn->local_ss;
 376 }
 377
 378 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 379 {
 380         return &conn->remote_ss;
 381 }
 382
 383 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 384 {
 385         return conn->remote_name;
 386 }
 387
 388 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 389 {
 390         if (conn->protocol >= PROTOCOL_SMB2_02) {
 391                 /*
 392                  * TODO...
 393                  */
 394                 return 1;
 395         }
 396
 397         return conn->smb1.server.max_mux;
 398 }
 399
 400 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 401 {
 402         if (conn->protocol >= PROTOCOL_SMB2_02) {
 403                 return conn->smb2.server.system_time;
 404         }
 405
 406         return conn->smb1.server.system_time;
 407 }
 408
 409 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 410 {
 411         if (conn->protocol >= PROTOCOL_SMB2_02) {
 412                 return &conn->smb2.server.gss_blob;
 413         }
 414
 415         return &conn->smb1.server.gss_blob;
 416 }
 417
 418 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 419 {
 420         if (conn->protocol >= PROTOCOL_SMB2_02) {
 421                 return &conn->smb2.server.guid;
 422         }
 423
 424         return &conn->smb1.server.guid;
 425 }
 426
 427 struct smbXcli_conn_samba_suicide_state {
 428         struct smbXcli_conn *conn;
 429         struct iovec iov;
 430         uint8_t buf[9];
 431 };
 432
 433 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq);
 434
 435 struct tevent_req *smbXcli_conn_samba_suicide_send(TALLOC_CTX *mem_ctx,
 436                                                    struct tevent_context *ev,
 437                                                    struct smbXcli_conn *conn,
 438                                                    uint8_t exitcode)
 439 {
 440         struct tevent_req *req, *subreq;
 441         struct smbXcli_conn_samba_suicide_state *state;
 442
 443         req = tevent_req_create(mem_ctx, &state,
 444                                 struct smbXcli_conn_samba_suicide_state);
 445         if (req == NULL) {
 446                 return NULL;
 447         }
 448         state->conn = conn;
 449         SIVAL(state->buf, 4, 0x74697865);
 450         SCVAL(state->buf, 8, exitcode);
 451         _smb_setlen_nbt(state->buf, sizeof(state->buf)-4);
 452
 453         state->iov.iov_base = state->buf;
 454         state->iov.iov_len = sizeof(state->buf);
 455
 456         subreq = writev_send(state, ev, conn->outgoing, conn->write_fd,
 457                              false, &state->iov, 1);
 458         if (tevent_req_nomem(subreq, req)) {
 459                 return tevent_req_post(req, ev);
 460         }
 461         tevent_req_set_callback(subreq, smbXcli_conn_samba_suicide_done, req);
 462         return req;
 463 }
 464
 465 static void smbXcli_conn_samba_suicide_done(struct tevent_req *subreq)
 466 {
 467         struct tevent_req *req = tevent_req_callback_data(
 468                 subreq, struct tevent_req);
 469         struct smbXcli_conn_samba_suicide_state *state = tevent_req_data(
 470                 req, struct smbXcli_conn_samba_suicide_state);
 471         ssize_t nwritten;
 472         int err;
 473
 474         nwritten = writev_recv(subreq, &err);
 475         TALLOC_FREE(subreq);
 476         if (nwritten == -1) {
 477                 NTSTATUS status = map_nt_error_from_unix_common(err);
 478                 smbXcli_conn_disconnect(state->conn, status);
 479                 return;
 480         }
 481         tevent_req_done(req);
 482 }
 483
 484 NTSTATUS smbXcli_conn_samba_suicide_recv(struct tevent_req *req)
 485 {
 486         return tevent_req_simple_recv_ntstatus(req);
 487 }
 488
 489 NTSTATUS smbXcli_conn_samba_suicide(struct smbXcli_conn *conn,
 490                                     uint8_t exitcode)
 491 {
 492         TALLOC_CTX *frame = talloc_stackframe();
 493         struct tevent_context *ev;
 494         struct tevent_req *req;
 495         NTSTATUS status = NT_STATUS_NO_MEMORY;
 496         bool ok;
 497
 498         if (smbXcli_conn_has_async_calls(conn)) {
 499                 /*
 500                  * Can't use sync call while an async call is in flight
 501                  */
 502                 status = NT_STATUS_INVALID_PARAMETER_MIX;
 503                 goto fail;
 504         }
 505         ev = tevent_context_init(frame);
 506         if (ev == NULL) {
 507                 goto fail;
 508         }
 509         req = smbXcli_conn_samba_suicide_send(frame, ev, conn, exitcode);
 510         if (req == NULL) {
 511                 goto fail;
 512         }
 513         ok = tevent_req_poll(req, ev);
 514         if (!ok) {
 515                 status = map_nt_error_from_unix_common(errno);
 516                 goto fail;
 517         }
 518         status = smbXcli_conn_samba_suicide_recv(req);
 519  fail:
 520         TALLOC_FREE(frame);
 521         return status;
 522 }
 523
 524 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 525 {
 526         return conn->smb1.capabilities;
 527 }
 528
 529 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 530 {
 531         return conn->smb1.max_xmit;
 532 }
 533
 534 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 535 {
 536         return conn->smb1.server.session_key;
 537 }
 538
 539 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 540 {
 541         return conn->smb1.server.challenge;
 542 }
 543
 544 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 545 {
 546         return conn->smb1.server.security_mode;
 547 }
 548
 549 bool smb1cli_conn_server_readbraw(struct smbXcli_conn *conn)
 550 {
 551         return conn->smb1.server.readbraw;
 552 }
 553
 554 bool smb1cli_conn_server_writebraw(struct smbXcli_conn *conn)
 555 {
 556         return conn->smb1.server.writebraw;
 557 }
 558
 559 bool smb1cli_conn_server_lockread(struct smbXcli_conn *conn)
 560 {
 561         return conn->smb1.server.lockread;
 562 }
 563
 564 bool smb1cli_conn_server_writeunlock(struct smbXcli_conn *conn)
 565 {
 566         return conn->smb1.server.writeunlock;
 567 }
 568
 569 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 570 {
 571         return conn->smb1.server.time_zone;
 572 }
 573
 574 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 575                                    const DATA_BLOB user_session_key,
 576                                    const DATA_BLOB response)
 577 {
 578         return smb_signing_activate(conn->smb1.signing,
 579                                     user_session_key,
 580                                     response);
 581 }
 582
 583 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 584                                 const uint8_t *buf, uint32_t seqnum)
 585 {
 586         return smb_signing_check_pdu(conn->smb1.signing, buf, seqnum);
 587 }
 588
 589 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 590 {
 591         return smb_signing_is_active(conn->smb1.signing);
 592 }
 593
 594 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 595                                  struct smb_trans_enc_state *es)
 596 {
 597         /* Replace the old state, if any. */
 598         if (conn->smb1.trans_enc) {
 599                 common_free_encryption_state(&conn->smb1.trans_enc);
 600         }
 601         conn->smb1.trans_enc = es;
 602 }
 603
 604 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 605 {
 606         return common_encryption_on(conn->smb1.trans_enc);
 607 }
 608
 609
 610 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 611 {
 612         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 613         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 614
 615         if (NT_STATUS_IS_OK(status)) {
 616                 return NT_STATUS_OK;
 617         }
 618
 619         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 620                 return status;
 621         }
 622
 623         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 624 }
 625
 626 /**
 627  * Is the SMB command able to hold an AND_X successor
 628  * @param[in] cmd       The SMB command in question
 629  * @retval Can we add a chained request after "cmd"?
 630  */
 631 bool smb1cli_is_andx_req(uint8_t cmd)
 632 {
 633         switch (cmd) {
 634         case SMBtconX:
 635         case SMBlockingX:
 636         case SMBopenX:
 637         case SMBreadX:
 638         case SMBwriteX:
 639         case SMBsesssetupX:
 640         case SMBulogoffX:
 641         case SMBntcreateX:
 642                 return true;
 643                 break;
 644         default:
 645                 break;
 646         }
 647
 648         return false;
 649 }
 650
 651 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 652 {
 653         size_t num_pending = talloc_array_length(conn->pending);
 654         uint16_t result;
 655
 656         while (true) {
 657                 size_t i;
 658
 659                 result = conn->smb1.mid++;
 660                 if ((result == 0) || (result == 0xffff)) {
 661                         continue;
 662                 }
 663
 664                 for (i=0; i<num_pending; i++) {
 665                         if (result == smb1cli_req_mid(conn->pending[i])) {
 666                                 break;
 667                         }
 668                 }
 669
 670                 if (i == num_pending) {
 671                         return result;
 672                 }
 673         }
 674 }
 675
 676 void smbXcli_req_unset_pending(struct tevent_req *req)
 677 {
 678         struct smbXcli_req_state *state =
 679                 tevent_req_data(req,
 680                 struct smbXcli_req_state);
 681         struct smbXcli_conn *conn = state->conn;
 682         size_t num_pending = talloc_array_length(conn->pending);
 683         size_t i;
 684
 685         if (state->smb1.mid != 0) {
 686                 /*
 687                  * This is a [nt]trans[2] request which waits
 688                  * for more than one reply.
 689                  */
 690                 return;
 691         }
 692
 693         talloc_set_destructor(req, NULL);
 694
 695         if (num_pending == 1) {
 696                 /*
 697                  * The pending read_smb tevent_req is a child of
 698                  * conn->pending. So if nothing is pending anymore, we need to
 699                  * delete the socket read fde.
 700                  */
 701                 TALLOC_FREE(conn->pending);
 702                 conn->read_smb_req = NULL;
 703                 return;
 704         }
 705
 706         for (i=0; i<num_pending; i++) {
 707                 if (req == conn->pending[i]) {
 708                         break;
 709                 }
 710         }
 711         if (i == num_pending) {
 712                 /*
 713                  * Something's seriously broken. Just returning here is the
 714                  * right thing nevertheless, the point of this routine is to
 715                  * remove ourselves from conn->pending.
 716                  */
 717                 return;
 718         }
 719
 720         /*
 721          * Remove ourselves from the conn->pending array
 722          */
 723         for (; i < (num_pending - 1); i++) {
 724                 conn->pending[i] = conn->pending[i+1];
 725         }
 726
 727         /*
 728          * No NULL check here, we're shrinking by sizeof(void *), and
 729          * talloc_realloc just adjusts the size for this.
 730          */
 731         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 732                                        num_pending - 1);
 733         return;
 734 }
 735
 736 static int smbXcli_req_destructor(struct tevent_req *req)
 737 {
 738         struct smbXcli_req_state *state =
 739                 tevent_req_data(req,
 740                 struct smbXcli_req_state);
 741
 742         /*
 743          * Make sure we really remove it from
 744          * the pending array on destruction.
 745          */
 746         state->smb1.mid = 0;
 747         smbXcli_req_unset_pending(req);
 748         return 0;
 749 }
 750
 751 static bool smb1cli_req_cancel(struct tevent_req *req);
 752 static bool smb2cli_req_cancel(struct tevent_req *req);
 753
 754 static bool smbXcli_req_cancel(struct tevent_req *req)
 755 {
 756         struct smbXcli_req_state *state =
 757                 tevent_req_data(req,
 758                 struct smbXcli_req_state);
 759
 760         if (!smbXcli_conn_is_connected(state->conn)) {
 761                 return false;
 762         }
 763
 764         if (state->conn->protocol == PROTOCOL_NONE) {
 765                 return false;
 766         }
 767
 768         if (state->conn->protocol >= PROTOCOL_SMB2_02) {
 769                 return smb2cli_req_cancel(req);
 770         }
 771
 772         return smb1cli_req_cancel(req);
 773 }
 774
 775 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 776
 777 bool smbXcli_req_set_pending(struct tevent_req *req)
 778 {
 779         struct smbXcli_req_state *state =
 780                 tevent_req_data(req,
 781                 struct smbXcli_req_state);
 782         struct smbXcli_conn *conn;
 783         struct tevent_req **pending;
 784         size_t num_pending;
 785
 786         conn = state->conn;
 787
 788         if (!smbXcli_conn_is_connected(conn)) {
 789                 return false;
 790         }
 791
 792         num_pending = talloc_array_length(conn->pending);
 793
 794         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 795                                  num_pending+1);
 796         if (pending == NULL) {
 797                 return false;
 798         }
 799         pending[num_pending] = req;
 800         conn->pending = pending;
 801         talloc_set_destructor(req, smbXcli_req_destructor);
 802         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
 803
 804         if (!smbXcli_conn_receive_next(conn)) {
 805                 /*
 806                  * the caller should notify the current request
 807                  *
 808                  * And all other pending requests get notified
 809                  * by smbXcli_conn_disconnect().
 810                  */
 811                 smbXcli_req_unset_pending(req);
 812                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 813                 return false;
 814         }
 815
 816         return true;
 817 }
 818
 819 static void smbXcli_conn_received(struct tevent_req *subreq);
 820
 821 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 822 {
 823         size_t num_pending = talloc_array_length(conn->pending);
 824         struct tevent_req *req;
 825         struct smbXcli_req_state *state;
 826
 827         if (conn->read_smb_req != NULL) {
 828                 return true;
 829         }
 830
 831         if (num_pending == 0) {
 832                 if (conn->smb2.mid < UINT64_MAX) {
 833                         /* no more pending requests, so we are done for now */
 834                         return true;
 835                 }
 836
 837                 /*
 838                  * If there are no more SMB2 requests possible,
 839                  * because we are out of message ids,
 840                  * we need to disconnect.
 841                  */
 842                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
 843                 return true;
 844         }
 845
 846         req = conn->pending[0];
 847         state = tevent_req_data(req, struct smbXcli_req_state);
 848
 849         /*
 850          * We're the first ones, add the read_smb request that waits for the
 851          * answer from the server
 852          */
 853         conn->read_smb_req = read_smb_send(conn->pending,
 854                                            state->ev,
 855                                            conn->read_fd);
 856         if (conn->read_smb_req == NULL) {
 857                 return false;
 858         }
 859         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
 860         return true;
 861 }
 862
 863 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
 864 {
 865         tevent_queue_stop(conn->outgoing);
 866
 867         if (conn->read_fd != -1) {
 868                 close(conn->read_fd);
 869         }
 870         if (conn->write_fd != -1) {
 871                 close(conn->write_fd);
 872         }
 873         conn->read_fd = -1;
 874         conn->write_fd = -1;
 875
 876         /*
 877          * Cancel all pending requests. We do not do a for-loop walking
 878          * conn->pending because that array changes in
 879          * smbXcli_req_unset_pending.
 880          */
 881         while (talloc_array_length(conn->pending) > 0) {
 882                 struct tevent_req *req;
 883                 struct smbXcli_req_state *state;
 884                 struct tevent_req **chain;
 885                 size_t num_chained;
 886                 size_t i;
 887
 888                 req = conn->pending[0];
 889                 state = tevent_req_data(req, struct smbXcli_req_state);
 890
 891                 if (state->smb1.chained_requests == NULL) {
 892                         /*
 893                          * We're dead. No point waiting for trans2
 894                          * replies.
 895                          */
 896                         state->smb1.mid = 0;
 897
 898                         smbXcli_req_unset_pending(req);
 899
 900                         if (NT_STATUS_IS_OK(status)) {
 901                                 /* do not notify the callers */
 902                                 continue;
 903                         }
 904
 905                         /*
 906                          * we need to defer the callback, because we may notify
 907                          * more then one caller.
 908                          */
 909                         tevent_req_defer_callback(req, state->ev);
 910                         tevent_req_nterror(req, status);
 911                         continue;
 912                 }
 913
 914                 chain = talloc_move(conn, &state->smb1.chained_requests);
 915                 num_chained = talloc_array_length(chain);
 916
 917                 for (i=0; i<num_chained; i++) {
 918                         req = chain[i];
 919                         state = tevent_req_data(req, struct smbXcli_req_state);
 920
 921                         /*
 922                          * We're dead. No point waiting for trans2
 923                          * replies.
 924                          */
 925                         state->smb1.mid = 0;
 926
 927                         smbXcli_req_unset_pending(req);
 928
 929                         if (NT_STATUS_IS_OK(status)) {
 930                                 /* do not notify the callers */
 931                                 continue;
 932                         }
 933
 934                         /*
 935                          * we need to defer the callback, because we may notify
 936                          * more than one caller.
 937                          */
 938                         tevent_req_defer_callback(req, state->ev);
 939                         tevent_req_nterror(req, status);
 940                 }
 941                 TALLOC_FREE(chain);
 942         }
 943 }
 944
 945 /*
 946  * Fetch a smb request's mid. Only valid after the request has been sent by
 947  * smb1cli_req_send().
 948  */
 949 uint16_t smb1cli_req_mid(struct tevent_req *req)
 950 {
 951         struct smbXcli_req_state *state =
 952                 tevent_req_data(req,
 953                 struct smbXcli_req_state);
 954
 955         if (state->smb1.mid != 0) {
 956                 return state->smb1.mid;
 957         }
 958
 959         return SVAL(state->smb1.hdr, HDR_MID);
 960 }
 961
 962 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
 963 {
 964         struct smbXcli_req_state *state =
 965                 tevent_req_data(req,
 966                 struct smbXcli_req_state);
 967
 968         state->smb1.mid = mid;
 969 }
 970
 971 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
 972 {
 973         struct smbXcli_req_state *state =
 974                 tevent_req_data(req,
 975                 struct smbXcli_req_state);
 976
 977         return state->smb1.seqnum;
 978 }
 979
 980 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
 981 {
 982         struct smbXcli_req_state *state =
 983                 tevent_req_data(req,
 984                 struct smbXcli_req_state);
 985
 986         state->smb1.seqnum = seqnum;
 987 }
 988
 989 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
 990 {
 991         size_t result = 0;
 992         int i;
 993         for (i=0; i<count; i++) {
 994                 result += iov[i].iov_len;
 995         }
 996         return result;
 997 }
 998
 999 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
1000                                    const struct iovec *iov,
1001                                    int count)
1002 {
1003         size_t len = smbXcli_iov_len(iov, count);
1004         size_t copied;
1005         uint8_t *buf;
1006         int i;
1007
1008         buf = talloc_array(mem_ctx, uint8_t, len);
1009         if (buf == NULL) {
1010                 return NULL;
1011         }
1012         copied = 0;
1013         for (i=0; i<count; i++) {
1014                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
1015                 copied += iov[i].iov_len;
1016         }
1017         return buf;
1018 }
1019
1020 static void smb1cli_req_flags(enum protocol_types protocol,
1021                               uint32_t smb1_capabilities,
1022                               uint8_t smb_command,
1023                               uint8_t additional_flags,
1024                               uint8_t clear_flags,
1025                               uint8_t *_flags,
1026                               uint16_t additional_flags2,
1027                               uint16_t clear_flags2,
1028                               uint16_t *_flags2)
1029 {
1030         uint8_t flags = 0;
1031         uint16_t flags2 = 0;
1032
1033         if (protocol >= PROTOCOL_LANMAN1) {
1034                 flags |= FLAG_CASELESS_PATHNAMES;
1035                 flags |= FLAG_CANONICAL_PATHNAMES;
1036         }
1037
1038         if (protocol >= PROTOCOL_LANMAN2) {
1039                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
1040                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
1041         }
1042
1043         if (protocol >= PROTOCOL_NT1) {
1044                 flags2 |= FLAGS2_IS_LONG_NAME;
1045
1046                 if (smb1_capabilities & CAP_UNICODE) {
1047                         flags2 |= FLAGS2_UNICODE_STRINGS;
1048                 }
1049                 if (smb1_capabilities & CAP_STATUS32) {
1050                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
1051                 }
1052                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
1053                         flags2 |= FLAGS2_EXTENDED_SECURITY;
1054                 }
1055         }
1056
1057         flags |= additional_flags;
1058         flags &= ~clear_flags;
1059         flags2 |= additional_flags2;
1060         flags2 &= ~clear_flags2;
1061
1062         *_flags = flags;
1063         *_flags2 = flags2;
1064 }
1065
1066 static void smb1cli_req_cancel_done(struct tevent_req *subreq);
1067
1068 static bool smb1cli_req_cancel(struct tevent_req *req)
1069 {
1070         struct smbXcli_req_state *state =
1071                 tevent_req_data(req,
1072                 struct smbXcli_req_state);
1073         uint8_t flags;
1074         uint16_t flags2;
1075         uint32_t pid;
1076         uint16_t tid;
1077         uint16_t uid;
1078         uint16_t mid;
1079         struct tevent_req *subreq;
1080         NTSTATUS status;
1081
1082         flags = CVAL(state->smb1.hdr, HDR_FLG);
1083         flags2 = SVAL(state->smb1.hdr, HDR_FLG2);
1084         pid  = SVAL(state->smb1.hdr, HDR_PID);
1085         pid |= SVAL(state->smb1.hdr, HDR_PIDHIGH)<<16;
1086         tid = SVAL(state->smb1.hdr, HDR_TID);
1087         uid = SVAL(state->smb1.hdr, HDR_UID);
1088         mid = SVAL(state->smb1.hdr, HDR_MID);
1089
1090         subreq = smb1cli_req_create(state, state->ev,
1091                                     state->conn,
1092                                     SMBntcancel,
1093                                     flags, 0,
1094                                     flags2, 0,
1095                                     0, /* timeout */
1096                                     pid, tid, uid,
1097                                     0, NULL, /* vwv */
1098                                     0, NULL); /* bytes */
1099         if (subreq == NULL) {
1100                 return false;
1101         }
1102         smb1cli_req_set_mid(subreq, mid);
1103
1104         status = smb1cli_req_chain_submit(&subreq, 1);
1105         if (!NT_STATUS_IS_OK(status)) {
1106                 TALLOC_FREE(subreq);
1107                 return false;
1108         }
1109         smb1cli_req_set_mid(subreq, 0);
1110
1111         tevent_req_set_callback(subreq, smb1cli_req_cancel_done, NULL);
1112
1113         return true;
1114 }
1115
1116 static void smb1cli_req_cancel_done(struct tevent_req *subreq)
1117 {
1118         /* we do not care about the result */
1119         TALLOC_FREE(subreq);
1120 }
1121
1122 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
1123                                       struct tevent_context *ev,
1124                                       struct smbXcli_conn *conn,
1125                                       uint8_t smb_command,
1126                                       uint8_t additional_flags,
1127                                       uint8_t clear_flags,
1128                                       uint16_t additional_flags2,
1129                                       uint16_t clear_flags2,
1130                                       uint32_t timeout_msec,
1131                                       uint32_t pid,
1132                                       uint16_t tid,
1133                                       uint16_t uid,
1134                                       uint8_t wct, uint16_t *vwv,
1135                                       int iov_count,
1136                                       struct iovec *bytes_iov)
1137 {
1138         struct tevent_req *req;
1139         struct smbXcli_req_state *state;
1140         uint8_t flags = 0;
1141         uint16_t flags2 = 0;
1142
1143         if (iov_count > MAX_SMB_IOV) {
1144                 /*
1145                  * Should not happen :-)
1146                  */
1147                 return NULL;
1148         }
1149
1150         req = tevent_req_create(mem_ctx, &state,
1151                                 struct smbXcli_req_state);
1152         if (req == NULL) {
1153                 return NULL;
1154         }
1155         state->ev = ev;
1156         state->conn = conn;
1157
1158         state->smb1.recv_cmd = 0xFF;
1159         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
1160         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
1161         if (state->smb1.recv_iov == NULL) {
1162                 TALLOC_FREE(req);
1163                 return NULL;
1164         }
1165
1166         smb1cli_req_flags(conn->protocol,
1167                           conn->smb1.capabilities,
1168                           smb_command,
1169                           additional_flags,
1170                           clear_flags,
1171                           &flags,
1172                           additional_flags2,
1173                           clear_flags2,
1174                           &flags2);
1175
1176         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
1177         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
1178         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
1179         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
1180         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
1181         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
1182         SSVAL(state->smb1.hdr, HDR_TID,     tid);
1183         SSVAL(state->smb1.hdr, HDR_PID,     pid);
1184         SSVAL(state->smb1.hdr, HDR_UID,     uid);
1185         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
1186         SCVAL(state->smb1.hdr, HDR_WCT,     wct);
1187
1188         state->smb1.vwv = vwv;
1189
1190         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
1191
1192         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
1193         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
1194         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
1195         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
1196         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
1197         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
1198         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
1199         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
1200
1201         if (iov_count != 0) {
1202                 memcpy(&state->smb1.iov[4], bytes_iov,
1203                        iov_count * sizeof(*bytes_iov));
1204         }
1205         state->smb1.iov_count = iov_count + 4;
1206
1207         if (timeout_msec > 0) {
1208                 struct timeval endtime;
1209
1210                 endtime = timeval_current_ofs_msec(timeout_msec);
1211                 if (!tevent_req_set_endtime(req, ev, endtime)) {
1212                         return req;
1213                 }
1214         }
1215
1216         switch (smb_command) {
1217         case SMBtranss:
1218         case SMBtranss2:
1219         case SMBnttranss:
1220                 state->one_way = true;
1221                 break;
1222         case SMBntcancel:
1223                 state->one_way = true;
1224                 state->smb1.one_way_seqnum = true;
1225                 break;
1226         case SMBlockingX:
1227                 if ((wct == 8) &&
1228                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1229                         state->one_way = true;
1230                 }
1231                 break;
1232         }
1233
1234         return req;
1235 }
1236
1237 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1238                                    struct iovec *iov, int iov_count,
1239                                    uint32_t *seqnum,
1240                                    bool one_way_seqnum)
1241 {
1242         TALLOC_CTX *frame = NULL;
1243         uint8_t *buf;
1244
1245         /*
1246          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1247          * iovec directly. MD5Update would do that just fine.
1248          */
1249
1250         if (iov_count < 4) {
1251                 return NT_STATUS_INVALID_PARAMETER_MIX;
1252         }
1253         if (iov[0].iov_len != NBT_HDR_SIZE) {
1254                 return NT_STATUS_INVALID_PARAMETER_MIX;
1255         }
1256         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1257                 return NT_STATUS_INVALID_PARAMETER_MIX;
1258         }
1259         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1260                 return NT_STATUS_INVALID_PARAMETER_MIX;
1261         }
1262         if (iov[3].iov_len != sizeof(uint16_t)) {
1263                 return NT_STATUS_INVALID_PARAMETER_MIX;
1264         }
1265
1266         frame = talloc_stackframe();
1267
1268         buf = smbXcli_iov_concat(frame, iov, iov_count);
1269         if (buf == NULL) {
1270                 return NT_STATUS_NO_MEMORY;
1271         }
1272
1273         *seqnum = smb_signing_next_seqnum(conn->smb1.signing,
1274                                           one_way_seqnum);
1275         smb_signing_sign_pdu(conn->smb1.signing, buf, *seqnum);
1276         memcpy(iov[1].iov_base, buf+4, iov[1].iov_len);
1277
1278         TALLOC_FREE(frame);
1279         return NT_STATUS_OK;
1280 }
1281
1282 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1283 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1284                                                TALLOC_CTX *tmp_mem,
1285                                                uint8_t *inbuf);
1286
1287 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1288                                           struct smbXcli_req_state *state,
1289                                           struct iovec *iov, int iov_count)
1290 {
1291         struct tevent_req *subreq;
1292         NTSTATUS status;
1293         uint8_t cmd;
1294         uint16_t mid;
1295
1296         if (!smbXcli_conn_is_connected(state->conn)) {
1297                 return NT_STATUS_CONNECTION_DISCONNECTED;
1298         }
1299
1300         if (state->conn->protocol > PROTOCOL_NT1) {
1301                 return NT_STATUS_REVISION_MISMATCH;
1302         }
1303
1304         if (iov_count < 4) {
1305                 return NT_STATUS_INVALID_PARAMETER_MIX;
1306         }
1307         if (iov[0].iov_len != NBT_HDR_SIZE) {
1308                 return NT_STATUS_INVALID_PARAMETER_MIX;
1309         }
1310         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1311                 return NT_STATUS_INVALID_PARAMETER_MIX;
1312         }
1313         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1314                 return NT_STATUS_INVALID_PARAMETER_MIX;
1315         }
1316         if (iov[3].iov_len != sizeof(uint16_t)) {
1317                 return NT_STATUS_INVALID_PARAMETER_MIX;
1318         }
1319
1320         cmd = CVAL(iov[1].iov_base, HDR_COM);
1321         if (cmd == SMBreadBraw) {
1322                 if (smbXcli_conn_has_async_calls(state->conn)) {
1323                         return NT_STATUS_INVALID_PARAMETER_MIX;
1324                 }
1325                 state->conn->smb1.read_braw_req = req;
1326         }
1327
1328         if (state->smb1.mid != 0) {
1329                 mid = state->smb1.mid;
1330         } else {
1331                 mid = smb1cli_alloc_mid(state->conn);
1332         }
1333         SSVAL(iov[1].iov_base, HDR_MID, mid);
1334
1335         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1336
1337         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1338                                     &state->smb1.seqnum,
1339                                     state->smb1.one_way_seqnum);
1340
1341         if (!NT_STATUS_IS_OK(status)) {
1342                 return status;
1343         }
1344
1345         /*
1346          * If we supported multiple encrytion contexts
1347          * here we'd look up based on tid.
1348          */
1349         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1350                 char *buf, *enc_buf;
1351
1352                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1353                 if (buf == NULL) {
1354                         return NT_STATUS_NO_MEMORY;
1355                 }
1356                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1357                                                (char *)buf, &enc_buf);
1358                 TALLOC_FREE(buf);
1359                 if (!NT_STATUS_IS_OK(status)) {
1360                         DEBUG(0, ("Error in encrypting client message: %s\n",
1361                                   nt_errstr(status)));
1362                         return status;
1363                 }
1364                 buf = (char *)talloc_memdup(state, enc_buf,
1365                                             smb_len_nbt(enc_buf)+4);
1366                 SAFE_FREE(enc_buf);
1367                 if (buf == NULL) {
1368                         return NT_STATUS_NO_MEMORY;
1369                 }
1370                 iov[0].iov_base = (void *)buf;
1371                 iov[0].iov_len = talloc_get_size(buf);
1372                 iov_count = 1;
1373         }
1374
1375         if (state->conn->dispatch_incoming == NULL) {
1376                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1377         }
1378
1379         tevent_req_set_cancel_fn(req, smbXcli_req_cancel);
1380
1381         subreq = writev_send(state, state->ev, state->conn->outgoing,
1382                              state->conn->write_fd, false, iov, iov_count);
1383         if (subreq == NULL) {
1384                 return NT_STATUS_NO_MEMORY;
1385         }
1386         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1387         return NT_STATUS_OK;
1388 }
1389
1390 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1391                                     struct tevent_context *ev,
1392                                     struct smbXcli_conn *conn,
1393                                     uint8_t smb_command,
1394                                     uint8_t additional_flags,
1395                                     uint8_t clear_flags,
1396                                     uint16_t additional_flags2,
1397                                     uint16_t clear_flags2,
1398                                     uint32_t timeout_msec,
1399                                     uint32_t pid,
1400                                     uint16_t tid,
1401                                     uint16_t uid,
1402                                     uint8_t wct, uint16_t *vwv,
1403                                     uint32_t num_bytes,
1404                                     const uint8_t *bytes)
1405 {
1406         struct tevent_req *req;
1407         struct iovec iov;
1408         NTSTATUS status;
1409
1410         iov.iov_base = discard_const_p(void, bytes);
1411         iov.iov_len = num_bytes;
1412
1413         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1414                                  additional_flags, clear_flags,
1415                                  additional_flags2, clear_flags2,
1416                                  timeout_msec,
1417                                  pid, tid, uid,
1418                                  wct, vwv, 1, &iov);
1419         if (req == NULL) {
1420                 return NULL;
1421         }
1422         if (!tevent_req_is_in_progress(req)) {
1423                 return tevent_req_post(req, ev);
1424         }
1425         status = smb1cli_req_chain_submit(&req, 1);
1426         if (tevent_req_nterror(req, status)) {
1427                 return tevent_req_post(req, ev);
1428         }
1429         return req;
1430 }
1431
1432 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1433 {
1434         struct tevent_req *req =
1435                 tevent_req_callback_data(subreq,
1436                 struct tevent_req);
1437         struct smbXcli_req_state *state =
1438                 tevent_req_data(req,
1439                 struct smbXcli_req_state);
1440         ssize_t nwritten;
1441         int err;
1442
1443         nwritten = writev_recv(subreq, &err);
1444         TALLOC_FREE(subreq);
1445         if (nwritten == -1) {
1446                 NTSTATUS status = map_nt_error_from_unix_common(err);
1447                 smbXcli_conn_disconnect(state->conn, status);
1448                 return;
1449         }
1450
1451         if (state->one_way) {
1452                 state->inbuf = NULL;
1453                 tevent_req_done(req);
1454                 return;
1455         }
1456
1457         if (!smbXcli_req_set_pending(req)) {
1458                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1459                 return;
1460         }
1461 }
1462
1463 static void smbXcli_conn_received(struct tevent_req *subreq)
1464 {
1465         struct smbXcli_conn *conn =
1466                 tevent_req_callback_data(subreq,
1467                 struct smbXcli_conn);
1468         TALLOC_CTX *frame = talloc_stackframe();
1469         NTSTATUS status;
1470         uint8_t *inbuf;
1471         ssize_t received;
1472         int err;
1473
1474         if (subreq != conn->read_smb_req) {
1475                 DEBUG(1, ("Internal error: cli_smb_received called with "
1476                           "unexpected subreq\n"));
1477                 status = NT_STATUS_INTERNAL_ERROR;
1478                 smbXcli_conn_disconnect(conn, status);
1479                 TALLOC_FREE(frame);
1480                 return;
1481         }
1482         conn->read_smb_req = NULL;
1483
1484         received = read_smb_recv(subreq, frame, &inbuf, &err);
1485         TALLOC_FREE(subreq);
1486         if (received == -1) {
1487                 status = map_nt_error_from_unix_common(err);
1488                 smbXcli_conn_disconnect(conn, status);
1489                 TALLOC_FREE(frame);
1490                 return;
1491         }
1492
1493         status = conn->dispatch_incoming(conn, frame, inbuf);
1494         TALLOC_FREE(frame);
1495         if (NT_STATUS_IS_OK(status)) {
1496                 /*
1497                  * We should not do any more processing
1498                  * as the dispatch function called
1499                  * tevent_req_done().
1500                  */
1501                 return;
1502         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1503                 /*
1504                  * We got an error, so notify all pending requests
1505                  */
1506                 smbXcli_conn_disconnect(conn, status);
1507                 return;
1508         }
1509
1510         /*
1511          * We got NT_STATUS_RETRY, so we may ask for a
1512          * next incoming pdu.
1513          */
1514         if (!smbXcli_conn_receive_next(conn)) {
1515                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1516         }
1517 }
1518
1519 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1520                                           struct iovec **piov, int *pnum_iov)
1521 {
1522         struct iovec *iov;
1523         int num_iov;
1524         size_t buflen;
1525         size_t taken;
1526         size_t remaining;
1527         uint8_t *hdr;
1528         uint8_t cmd;
1529         uint32_t wct_ofs;
1530
1531         buflen = smb_len_nbt(buf);
1532         taken = 0;
1533
1534         hdr = buf + NBT_HDR_SIZE;
1535
1536         if (buflen < MIN_SMB_SIZE) {
1537                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1538         }
1539
1540         /*
1541          * This returns iovec elements in the following order:
1542          *
1543          * - SMB header
1544          *
1545          * - Parameter Block
1546          * - Data Block
1547          *
1548          * - Parameter Block
1549          * - Data Block
1550          *
1551          * - Parameter Block
1552          * - Data Block
1553          */
1554         num_iov = 1;
1555
1556         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1557         if (iov == NULL) {
1558                 return NT_STATUS_NO_MEMORY;
1559         }
1560         iov[0].iov_base = hdr;
1561         iov[0].iov_len = HDR_WCT;
1562         taken += HDR_WCT;
1563
1564         cmd = CVAL(hdr, HDR_COM);
1565         wct_ofs = HDR_WCT;
1566
1567         while (true) {
1568                 size_t len = buflen - taken;
1569                 struct iovec *cur;
1570                 struct iovec *iov_tmp;
1571                 uint8_t wct;
1572                 uint32_t bcc_ofs;
1573                 uint16_t bcc;
1574                 size_t needed;
1575
1576                 /*
1577                  * we need at least WCT and BCC
1578                  */
1579                 needed = sizeof(uint8_t) + sizeof(uint16_t);
1580                 if (len < needed) {
1581                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1582                                    __location__, (int)len, (int)needed));
1583                         goto inval;
1584                 }
1585
1586                 /*
1587                  * Now we check if the specified words are there
1588                  */
1589                 wct = CVAL(hdr, wct_ofs);
1590                 needed += wct * sizeof(uint16_t);
1591                 if (len < needed) {
1592                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1593                                    __location__, (int)len, (int)needed));
1594                         goto inval;
1595                 }
1596
1597                 /*
1598                  * Now we check if the specified bytes are there
1599                  */
1600                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1601                 bcc = SVAL(hdr, bcc_ofs);
1602                 needed += bcc * sizeof(uint8_t);
1603                 if (len < needed) {
1604                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1605                                    __location__, (int)len, (int)needed));
1606                         goto inval;
1607                 }
1608
1609                 /*
1610                  * we allocate 2 iovec structures for words and bytes
1611                  */
1612                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1613                                          num_iov + 2);
1614                 if (iov_tmp == NULL) {
1615                         TALLOC_FREE(iov);
1616                         return NT_STATUS_NO_MEMORY;
1617                 }
1618                 iov = iov_tmp;
1619                 cur = &iov[num_iov];
1620                 num_iov += 2;
1621
1622                 cur[0].iov_len = wct * sizeof(uint16_t);
1623                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1624                 cur[1].iov_len = bcc * sizeof(uint8_t);
1625                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1626
1627                 taken += needed;
1628
1629                 if (!smb1cli_is_andx_req(cmd)) {
1630                         /*
1631                          * If the current command does not have AndX chanining
1632                          * we are done.
1633                          */
1634                         break;
1635                 }
1636
1637                 if (wct == 0 && bcc == 0) {
1638                         /*
1639                          * An empty response also ends the chain,
1640                          * most likely with an error.
1641                          */
1642                         break;
1643                 }
1644
1645                 if (wct < 2) {
1646                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1647                                    __location__, (int)wct, (int)cmd));
1648                         goto inval;
1649                 }
1650                 cmd = CVAL(cur[0].iov_base, 0);
1651                 if (cmd == 0xFF) {
1652                         /*
1653                          * If it is the end of the chain we are also done.
1654                          */
1655                         break;
1656                 }
1657                 wct_ofs = SVAL(cur[0].iov_base, 2);
1658
1659                 if (wct_ofs < taken) {
1660                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1661                 }
1662                 if (wct_ofs > buflen) {
1663                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1664                 }
1665
1666                 /*
1667                  * we consumed everything up to the start of the next
1668                  * parameter block.
1669                  */
1670                 taken = wct_ofs;
1671         }
1672
1673         remaining = buflen - taken;
1674
1675         if (remaining > 0 && num_iov >= 3) {
1676                 /*
1677                  * The last DATA block gets the remaining
1678                  * bytes, this is needed to support
1679                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1680                  */
1681                 iov[num_iov-1].iov_len += remaining;
1682         }
1683
1684         *piov = iov;
1685         *pnum_iov = num_iov;
1686         return NT_STATUS_OK;
1687
1688 inval:
1689         TALLOC_FREE(iov);
1690         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1691 }
1692
1693 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1694                                                TALLOC_CTX *tmp_mem,
1695                                                uint8_t *inbuf)
1696 {
1697         struct tevent_req *req;
1698         struct smbXcli_req_state *state;
1699         NTSTATUS status;
1700         size_t num_pending;
1701         size_t i;
1702         uint8_t cmd;
1703         uint16_t mid;
1704         bool oplock_break;
1705         const uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1706         struct iovec *iov = NULL;
1707         int num_iov = 0;
1708         struct tevent_req **chain = NULL;
1709         size_t num_chained = 0;
1710         size_t num_responses = 0;
1711
1712         if (conn->smb1.read_braw_req != NULL) {
1713                 req = conn->smb1.read_braw_req;
1714                 conn->smb1.read_braw_req = NULL;
1715                 state = tevent_req_data(req, struct smbXcli_req_state);
1716
1717                 smbXcli_req_unset_pending(req);
1718
1719                 if (state->smb1.recv_iov == NULL) {
1720                         /*
1721                          * For requests with more than
1722                          * one response, we have to readd the
1723                          * recv_iov array.
1724                          */
1725                         state->smb1.recv_iov = talloc_zero_array(state,
1726                                                                  struct iovec,
1727                                                                  3);
1728                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1729                                 return NT_STATUS_OK;
1730                         }
1731                 }
1732
1733                 state->smb1.recv_iov[0].iov_base = (void *)(inbuf + NBT_HDR_SIZE);
1734                 state->smb1.recv_iov[0].iov_len = smb_len_nbt(inbuf);
1735                 ZERO_STRUCT(state->smb1.recv_iov[1]);
1736                 ZERO_STRUCT(state->smb1.recv_iov[2]);
1737
1738                 state->smb1.recv_cmd = SMBreadBraw;
1739                 state->smb1.recv_status = NT_STATUS_OK;
1740                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1741
1742                 tevent_req_done(req);
1743                 return NT_STATUS_OK;
1744         }
1745
1746         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1747             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1748                 DEBUG(10, ("Got non-SMB PDU\n"));
1749                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1750         }
1751
1752         /*
1753          * If we supported multiple encrytion contexts
1754          * here we'd look up based on tid.
1755          */
1756         if (common_encryption_on(conn->smb1.trans_enc)
1757             && (CVAL(inbuf, 0) == 0)) {
1758                 uint16_t enc_ctx_num;
1759
1760                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1761                 if (!NT_STATUS_IS_OK(status)) {
1762                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1763                                    nt_errstr(status)));
1764                         return status;
1765                 }
1766
1767                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1768                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1769                                    enc_ctx_num,
1770                                    conn->smb1.trans_enc->enc_ctx_num));
1771                         return NT_STATUS_INVALID_HANDLE;
1772                 }
1773
1774                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1775                                                (char *)inbuf);
1776                 if (!NT_STATUS_IS_OK(status)) {
1777                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1778                                    nt_errstr(status)));
1779                         return status;
1780                 }
1781         }
1782
1783         mid = SVAL(inhdr, HDR_MID);
1784         num_pending = talloc_array_length(conn->pending);
1785
1786         for (i=0; i<num_pending; i++) {
1787                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1788                         break;
1789                 }
1790         }
1791         if (i == num_pending) {
1792                 /* Dump unexpected reply */
1793                 return NT_STATUS_RETRY;
1794         }
1795
1796         oplock_break = false;
1797
1798         if (mid == 0xffff) {
1799                 /*
1800                  * Paranoia checks that this is really an oplock break request.
1801                  */
1802                 oplock_break = (smb_len_nbt(inbuf) == 51); /* hdr + 8 words */
1803                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1804                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1805                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1806                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1807
1808                 if (!oplock_break) {
1809                         /* Dump unexpected reply */
1810                         return NT_STATUS_RETRY;
1811                 }
1812         }
1813
1814         req = conn->pending[i];
1815         state = tevent_req_data(req, struct smbXcli_req_state);
1816
1817         if (!oplock_break /* oplock breaks are not signed */
1818             && !smb_signing_check_pdu(conn->smb1.signing,
1819                                       inbuf, state->smb1.seqnum+1)) {
1820                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1821                 return NT_STATUS_ACCESS_DENIED;
1822         }
1823
1824         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
1825                                            &iov, &num_iov);
1826         if (!NT_STATUS_IS_OK(status)) {
1827                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
1828                           nt_errstr(status)));
1829                 return status;
1830         }
1831
1832         cmd = CVAL(inhdr, HDR_COM);
1833         status = smb1cli_pull_raw_error(inhdr);
1834
1835         if (state->smb1.chained_requests == NULL) {
1836                 if (num_iov != 3) {
1837                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1838                 }
1839
1840                 smbXcli_req_unset_pending(req);
1841
1842                 if (state->smb1.recv_iov == NULL) {
1843                         /*
1844                          * For requests with more than
1845                          * one response, we have to readd the
1846                          * recv_iov array.
1847                          */
1848                         state->smb1.recv_iov = talloc_zero_array(state,
1849                                                                  struct iovec,
1850                                                                  3);
1851                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1852                                 return NT_STATUS_OK;
1853                         }
1854                 }
1855
1856                 state->smb1.recv_cmd = cmd;
1857                 state->smb1.recv_status = status;
1858                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1859
1860                 state->smb1.recv_iov[0] = iov[0];
1861                 state->smb1.recv_iov[1] = iov[1];
1862                 state->smb1.recv_iov[2] = iov[2];
1863
1864                 if (talloc_array_length(conn->pending) == 0) {
1865                         tevent_req_done(req);
1866                         return NT_STATUS_OK;
1867                 }
1868
1869                 tevent_req_defer_callback(req, state->ev);
1870                 tevent_req_done(req);
1871                 return NT_STATUS_RETRY;
1872         }
1873
1874         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
1875         num_chained = talloc_array_length(chain);
1876         num_responses = (num_iov - 1)/2;
1877
1878         if (num_responses > num_chained) {
1879                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1880         }
1881
1882         for (i=0; i<num_chained; i++) {
1883                 size_t iov_idx = 1 + (i*2);
1884                 struct iovec *cur = &iov[iov_idx];
1885                 uint8_t *inbuf_ref;
1886
1887                 req = chain[i];
1888                 state = tevent_req_data(req, struct smbXcli_req_state);
1889
1890                 smbXcli_req_unset_pending(req);
1891
1892                 /*
1893                  * as we finish multiple requests here
1894                  * we need to defer the callbacks as
1895                  * they could destroy our current stack state.
1896                  */
1897                 tevent_req_defer_callback(req, state->ev);
1898
1899                 if (i >= num_responses) {
1900                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
1901                         continue;
1902                 }
1903
1904                 if (state->smb1.recv_iov == NULL) {
1905                         /*
1906                          * For requests with more than
1907                          * one response, we have to readd the
1908                          * recv_iov array.
1909                          */
1910                         state->smb1.recv_iov = talloc_zero_array(state,
1911                                                                  struct iovec,
1912                                                                  3);
1913                         if (tevent_req_nomem(state->smb1.recv_iov, req)) {
1914                                 continue;
1915                         }
1916                 }
1917
1918                 state->smb1.recv_cmd = cmd;
1919
1920                 if (i == (num_responses - 1)) {
1921                         /*
1922                          * The last request in the chain gets the status
1923                          */
1924                         state->smb1.recv_status = status;
1925                 } else {
1926                         cmd = CVAL(cur[0].iov_base, 0);
1927                         state->smb1.recv_status = NT_STATUS_OK;
1928                 }
1929
1930                 state->inbuf = inbuf;
1931
1932                 /*
1933                  * Note: here we use talloc_reference() in a way
1934                  *       that does not expose it to the caller.
1935                  */
1936                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
1937                 if (tevent_req_nomem(inbuf_ref, req)) {
1938                         continue;
1939                 }
1940
1941                 /* copy the related buffers */
1942                 state->smb1.recv_iov[0] = iov[0];
1943                 state->smb1.recv_iov[1] = cur[0];
1944                 state->smb1.recv_iov[2] = cur[1];
1945
1946                 tevent_req_done(req);
1947         }
1948
1949         return NT_STATUS_RETRY;
1950 }
1951
1952 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
1953                           TALLOC_CTX *mem_ctx,
1954                           struct iovec **piov,
1955                           uint8_t **phdr,
1956                           uint8_t *pwct,
1957                           uint16_t **pvwv,
1958                           uint32_t *pvwv_offset,
1959                           uint32_t *pnum_bytes,
1960                           uint8_t **pbytes,
1961                           uint32_t *pbytes_offset,
1962                           uint8_t **pinbuf,
1963                           const struct smb1cli_req_expected_response *expected,
1964                           size_t num_expected)
1965 {
1966         struct smbXcli_req_state *state =
1967                 tevent_req_data(req,
1968                 struct smbXcli_req_state);
1969         NTSTATUS status = NT_STATUS_OK;
1970         struct iovec *recv_iov = NULL;
1971         uint8_t *hdr = NULL;
1972         uint8_t wct = 0;
1973         uint32_t vwv_offset = 0;
1974         uint16_t *vwv = NULL;
1975         uint32_t num_bytes = 0;
1976         uint32_t bytes_offset = 0;
1977         uint8_t *bytes = NULL;
1978         size_t i;
1979         bool found_status = false;
1980         bool found_size = false;
1981
1982         if (piov != NULL) {
1983                 *piov = NULL;
1984         }
1985         if (phdr != NULL) {
1986                 *phdr = 0;
1987         }
1988         if (pwct != NULL) {
1989                 *pwct = 0;
1990         }
1991         if (pvwv != NULL) {
1992                 *pvwv = NULL;
1993         }
1994         if (pvwv_offset != NULL) {
1995                 *pvwv_offset = 0;
1996         }
1997         if (pnum_bytes != NULL) {
1998                 *pnum_bytes = 0;
1999         }
2000         if (pbytes != NULL) {
2001                 *pbytes = NULL;
2002         }
2003         if (pbytes_offset != NULL) {
2004                 *pbytes_offset = 0;
2005         }
2006         if (pinbuf != NULL) {
2007                 *pinbuf = NULL;
2008         }
2009
2010         if (state->inbuf != NULL) {
2011                 recv_iov = state->smb1.recv_iov;
2012                 state->smb1.recv_iov = NULL;
2013                 if (state->smb1.recv_cmd != SMBreadBraw) {
2014                         hdr = (uint8_t *)recv_iov[0].iov_base;
2015                         wct = recv_iov[1].iov_len/2;
2016                         vwv = (uint16_t *)recv_iov[1].iov_base;
2017                         vwv_offset = PTR_DIFF(vwv, hdr);
2018                         num_bytes = recv_iov[2].iov_len;
2019                         bytes = (uint8_t *)recv_iov[2].iov_base;
2020                         bytes_offset = PTR_DIFF(bytes, hdr);
2021                 }
2022         }
2023
2024         if (tevent_req_is_nterror(req, &status)) {
2025                 for (i=0; i < num_expected; i++) {
2026                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2027                                 found_status = true;
2028                                 break;
2029                         }
2030                 }
2031
2032                 if (found_status) {
2033                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2034                 }
2035
2036                 return status;
2037         }
2038
2039         if (num_expected == 0) {
2040                 found_status = true;
2041                 found_size = true;
2042         }
2043
2044         status = state->smb1.recv_status;
2045
2046         for (i=0; i < num_expected; i++) {
2047                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2048                         continue;
2049                 }
2050
2051                 found_status = true;
2052                 if (expected[i].wct == 0) {
2053                         found_size = true;
2054                         break;
2055                 }
2056
2057                 if (expected[i].wct == wct) {
2058                         found_size = true;
2059                         break;
2060                 }
2061         }
2062
2063         if (!found_status) {
2064                 return status;
2065         }
2066
2067         if (!found_size) {
2068                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2069         }
2070
2071         if (piov != NULL) {
2072                 *piov = talloc_move(mem_ctx, &recv_iov);
2073         }
2074
2075         if (phdr != NULL) {
2076                 *phdr = hdr;
2077         }
2078         if (pwct != NULL) {
2079                 *pwct = wct;
2080         }
2081         if (pvwv != NULL) {
2082                 *pvwv = vwv;
2083         }
2084         if (pvwv_offset != NULL) {
2085                 *pvwv_offset = vwv_offset;
2086         }
2087         if (pnum_bytes != NULL) {
2088                 *pnum_bytes = num_bytes;
2089         }
2090         if (pbytes != NULL) {
2091                 *pbytes = bytes;
2092         }
2093         if (pbytes_offset != NULL) {
2094                 *pbytes_offset = bytes_offset;
2095         }
2096         if (pinbuf != NULL) {
2097                 *pinbuf = state->inbuf;
2098         }
2099
2100         return status;
2101 }
2102
2103 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
2104 {
2105         size_t wct_ofs;
2106         int i;
2107
2108         wct_ofs = HDR_WCT;
2109
2110         for (i=0; i<num_reqs; i++) {
2111                 struct smbXcli_req_state *state;
2112                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2113                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
2114                                            state->smb1.iov_count-2);
2115                 wct_ofs = (wct_ofs + 3) & ~3;
2116         }
2117         return wct_ofs;
2118 }
2119
2120 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
2121 {
2122         struct smbXcli_req_state *first_state =
2123                 tevent_req_data(reqs[0],
2124                 struct smbXcli_req_state);
2125         struct smbXcli_req_state *state;
2126         size_t wct_offset;
2127         size_t chain_padding = 0;
2128         int i, iovlen;
2129         struct iovec *iov = NULL;
2130         struct iovec *this_iov;
2131         NTSTATUS status;
2132         size_t nbt_len;
2133
2134         if (num_reqs == 1) {
2135                 return smb1cli_req_writev_submit(reqs[0], first_state,
2136                                                  first_state->smb1.iov,
2137                                                  first_state->smb1.iov_count);
2138         }
2139
2140         iovlen = 0;
2141         for (i=0; i<num_reqs; i++) {
2142                 if (!tevent_req_is_in_progress(reqs[i])) {
2143                         return NT_STATUS_INTERNAL_ERROR;
2144                 }
2145
2146                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2147
2148                 if (state->smb1.iov_count < 4) {
2149                         return NT_STATUS_INVALID_PARAMETER_MIX;
2150                 }
2151
2152                 if (i == 0) {
2153                         /*
2154                          * The NBT and SMB header
2155                          */
2156                         iovlen += 2;
2157                 } else {
2158                         /*
2159                          * Chain padding
2160                          */
2161                         iovlen += 1;
2162                 }
2163
2164                 /*
2165                  * words and bytes
2166                  */
2167                 iovlen += state->smb1.iov_count - 2;
2168         }
2169
2170         iov = talloc_zero_array(first_state, struct iovec, iovlen);
2171         if (iov == NULL) {
2172                 return NT_STATUS_NO_MEMORY;
2173         }
2174
2175         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
2176                 first_state, reqs, sizeof(*reqs) * num_reqs);
2177         if (first_state->smb1.chained_requests == NULL) {
2178                 TALLOC_FREE(iov);
2179                 return NT_STATUS_NO_MEMORY;
2180         }
2181
2182         wct_offset = HDR_WCT;
2183         this_iov = iov;
2184
2185         for (i=0; i<num_reqs; i++) {
2186                 size_t next_padding = 0;
2187                 uint16_t *vwv;
2188
2189                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2190
2191                 if (i < num_reqs-1) {
2192                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
2193                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
2194                                 TALLOC_FREE(iov);
2195                                 TALLOC_FREE(first_state->smb1.chained_requests);
2196                                 return NT_STATUS_INVALID_PARAMETER_MIX;
2197                         }
2198                 }
2199
2200                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
2201                                               state->smb1.iov_count-2) + 1;
2202                 if ((wct_offset % 4) != 0) {
2203                         next_padding = 4 - (wct_offset % 4);
2204                 }
2205                 wct_offset += next_padding;
2206                 vwv = state->smb1.vwv;
2207
2208                 if (i < num_reqs-1) {
2209                         struct smbXcli_req_state *next_state =
2210                                 tevent_req_data(reqs[i+1],
2211                                 struct smbXcli_req_state);
2212                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
2213                         SCVAL(vwv+0, 1, 0);
2214                         SSVAL(vwv+1, 0, wct_offset);
2215                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
2216                         /* properly end the chain */
2217                         SCVAL(vwv+0, 0, 0xff);
2218                         SCVAL(vwv+0, 1, 0xff);
2219                         SSVAL(vwv+1, 0, 0);
2220                 }
2221
2222                 if (i == 0) {
2223                         /*
2224                          * The NBT and SMB header
2225                          */
2226                         this_iov[0] = state->smb1.iov[0];
2227                         this_iov[1] = state->smb1.iov[1];
2228                         this_iov += 2;
2229                 } else {
2230                         /*
2231                          * This one is a bit subtle. We have to add
2232                          * chain_padding bytes between the requests, and we
2233                          * have to also include the wct field of the
2234                          * subsequent requests. We use the subsequent header
2235                          * for the padding, it contains the wct field in its
2236                          * last byte.
2237                          */
2238                         this_iov[0].iov_len = chain_padding+1;
2239                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
2240                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
2241                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
2242                         this_iov += 1;
2243                 }
2244
2245                 /*
2246                  * copy the words and bytes
2247                  */
2248                 memcpy(this_iov, state->smb1.iov+2,
2249                        sizeof(struct iovec) * (state->smb1.iov_count-2));
2250                 this_iov += state->smb1.iov_count - 2;
2251                 chain_padding = next_padding;
2252         }
2253
2254         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
2255         if (nbt_len > first_state->conn->smb1.max_xmit) {
2256                 TALLOC_FREE(iov);
2257                 TALLOC_FREE(first_state->smb1.chained_requests);
2258                 return NT_STATUS_INVALID_PARAMETER_MIX;
2259         }
2260
2261         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
2262         if (!NT_STATUS_IS_OK(status)) {
2263                 TALLOC_FREE(iov);
2264                 TALLOC_FREE(first_state->smb1.chained_requests);
2265                 return status;
2266         }
2267
2268         return NT_STATUS_OK;
2269 }
2270
2271 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
2272 {
2273         return ((tevent_queue_length(conn->outgoing) != 0)
2274                 || (talloc_array_length(conn->pending) != 0));
2275 }
2276
2277 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
2278 {
2279         return conn->smb2.server.capabilities;
2280 }
2281
2282 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
2283 {
2284         return conn->smb2.server.security_mode;
2285 }
2286
2287 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
2288 {
2289         return conn->smb2.server.max_trans_size;
2290 }
2291
2292 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
2293 {
2294         return conn->smb2.server.max_read_size;
2295 }
2296
2297 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
2298 {
2299         return conn->smb2.server.max_write_size;
2300 }
2301
2302 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
2303                                   uint16_t max_credits)
2304 {
2305         conn->smb2.max_credits = max_credits;
2306 }
2307
2308 static void smb2cli_req_cancel_done(struct tevent_req *subreq);
2309
2310 static bool smb2cli_req_cancel(struct tevent_req *req)
2311 {
2312         struct smbXcli_req_state *state =
2313                 tevent_req_data(req,
2314                 struct smbXcli_req_state);
2315         uint32_t flags = IVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2316         uint32_t pid = IVAL(state->smb2.hdr, SMB2_HDR_PID);
2317         uint32_t tid = IVAL(state->smb2.hdr, SMB2_HDR_TID);
2318         uint64_t mid = BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID);
2319         uint64_t aid = BVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID);
2320         struct smbXcli_session *session = state->session;
2321         uint8_t *fixed = state->smb2.pad;
2322         uint16_t fixed_len = 4;
2323         struct tevent_req *subreq;
2324         struct smbXcli_req_state *substate;
2325         NTSTATUS status;
2326
2327         SSVAL(fixed, 0, 0x04);
2328         SSVAL(fixed, 2, 0);
2329
2330         subreq = smb2cli_req_create(state, state->ev,
2331                                     state->conn,
2332                                     SMB2_OP_CANCEL,
2333                                     flags, 0,
2334                                     0, /* timeout */
2335                                     pid, tid, session,
2336                                     fixed, fixed_len,
2337                                     NULL, 0);
2338         if (subreq == NULL) {
2339                 return false;
2340         }
2341         substate = tevent_req_data(subreq, struct smbXcli_req_state);
2342
2343         if (flags & SMB2_HDR_FLAG_ASYNC) {
2344                 mid = 0;
2345         }
2346
2347         SIVAL(substate->smb2.hdr, SMB2_HDR_FLAGS, flags);
2348         SIVAL(substate->smb2.hdr, SMB2_HDR_PID, pid);
2349         SIVAL(substate->smb2.hdr, SMB2_HDR_TID, tid);
2350         SBVAL(substate->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2351         SBVAL(substate->smb2.hdr, SMB2_HDR_ASYNC_ID, aid);
2352
2353         status = smb2cli_req_compound_submit(&subreq, 1);
2354         if (!NT_STATUS_IS_OK(status)) {
2355                 TALLOC_FREE(subreq);
2356                 return false;
2357         }
2358
2359         tevent_req_set_callback(subreq, smb2cli_req_cancel_done, NULL);
2360
2361         return true;
2362 }
2363
2364 static void smb2cli_req_cancel_done(struct tevent_req *subreq)
2365 {
2366         /* we do not care about the result */
2367         TALLOC_FREE(subreq);
2368 }
2369
2370 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2371                                       struct tevent_context *ev,
2372                                       struct smbXcli_conn *conn,
2373                                       uint16_t cmd,
2374                                       uint32_t additional_flags,
2375                                       uint32_t clear_flags,
2376                                       uint32_t timeout_msec,
2377                                       uint32_t pid,
2378                                       uint32_t tid,
2379                                       struct smbXcli_session *session,
2380                                       const uint8_t *fixed,
2381                                       uint16_t fixed_len,
2382                                       const uint8_t *dyn,
2383                                       uint32_t dyn_len)
2384 {
2385         struct tevent_req *req;
2386         struct smbXcli_req_state *state;
2387         uint32_t flags = 0;
2388         uint64_t uid = 0;
2389
2390         req = tevent_req_create(mem_ctx, &state,
2391                                 struct smbXcli_req_state);
2392         if (req == NULL) {
2393                 return NULL;
2394         }
2395
2396         state->ev = ev;
2397         state->conn = conn;
2398         state->session = session;
2399
2400         if (session) {
2401                 uid = session->smb2.session_id;
2402         }
2403
2404         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2405         if (state->smb2.recv_iov == NULL) {
2406                 TALLOC_FREE(req);
2407                 return NULL;
2408         }
2409
2410         flags |= additional_flags;
2411         flags &= ~clear_flags;
2412
2413         state->smb2.fixed = fixed;
2414         state->smb2.fixed_len = fixed_len;
2415         state->smb2.dyn = dyn;
2416         state->smb2.dyn_len = dyn_len;
2417
2418         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2419         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2420         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2421         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2422         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            pid);
2423         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2424         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2425
2426         switch (cmd) {
2427         case SMB2_OP_CANCEL:
2428                 state->one_way = true;
2429                 break;
2430         case SMB2_OP_BREAK:
2431                 /*
2432                  * If this is a dummy request, it will have
2433                  * UINT64_MAX as message id.
2434                  * If we send on break acknowledgement,
2435                  * this gets overwritten later.
2436                  */
2437                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2438                 break;
2439         }
2440
2441         if (timeout_msec > 0) {
2442                 struct timeval endtime;
2443
2444                 endtime = timeval_current_ofs_msec(timeout_msec);
2445                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2446                         return req;
2447                 }
2448         }
2449
2450         return req;
2451 }
2452
2453 void smb2cli_req_set_notify_async(struct tevent_req *req)
2454 {
2455         struct smbXcli_req_state *state =
2456                 tevent_req_data(req,
2457                 struct smbXcli_req_state);
2458
2459         state->smb2.notify_async = true;
2460 }
2461
2462 static void smb2cli_req_writev_done(struct tevent_req *subreq);
2463 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2464                                                TALLOC_CTX *tmp_mem,
2465                                                uint8_t *inbuf);
2466
2467 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2468                                      int num_reqs)
2469 {
2470         struct smbXcli_req_state *state;
2471         struct tevent_req *subreq;
2472         struct iovec *iov;
2473         int i, num_iov, nbt_len;
2474
2475         /*
2476          * 1 for the nbt length
2477          * per request: HDR, fixed, dyn, padding
2478          * -1 because the last one does not need padding
2479          */
2480
2481         iov = talloc_array(reqs[0], struct iovec, 1 + 4*num_reqs - 1);
2482         if (iov == NULL) {
2483                 return NT_STATUS_NO_MEMORY;
2484         }
2485
2486         num_iov = 1;
2487         nbt_len = 0;
2488
2489         for (i=0; i<num_reqs; i++) {
2490                 int hdr_iov;
2491                 size_t reqlen;
2492                 bool ret;
2493                 uint16_t opcode;
2494                 uint64_t avail;
2495                 uint16_t charge;
2496                 uint16_t credits;
2497                 uint64_t mid;
2498                 bool should_sign = false;
2499
2500                 if (!tevent_req_is_in_progress(reqs[i])) {
2501                         return NT_STATUS_INTERNAL_ERROR;
2502                 }
2503
2504                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2505
2506                 if (!smbXcli_conn_is_connected(state->conn)) {
2507                         return NT_STATUS_CONNECTION_DISCONNECTED;
2508                 }
2509
2510                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2511                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2512                         return NT_STATUS_REVISION_MISMATCH;
2513                 }
2514
2515                 opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2516                 if (opcode == SMB2_OP_CANCEL) {
2517                         goto skip_credits;
2518                 }
2519
2520                 avail = UINT64_MAX - state->conn->smb2.mid;
2521                 if (avail < 1) {
2522                         return NT_STATUS_CONNECTION_ABORTED;
2523                 }
2524
2525                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2526                         charge = (MAX(state->smb2.dyn_len, 1) - 1)/ 65536 + 1;
2527                 } else {
2528                         charge = 1;
2529                 }
2530
2531                 charge = MAX(state->smb2.credit_charge, charge);
2532
2533                 avail = MIN(avail, state->conn->smb2.cur_credits);
2534                 if (avail < charge) {
2535                         return NT_STATUS_INTERNAL_ERROR;
2536                 }
2537
2538                 credits = 0;
2539                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2540                         credits = state->conn->smb2.max_credits -
2541                                   state->conn->smb2.cur_credits;
2542                 }
2543                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2544                         credits += 1;
2545                 }
2546
2547                 mid = state->conn->smb2.mid;
2548                 state->conn->smb2.mid += charge;
2549                 state->conn->smb2.cur_credits -= charge;
2550
2551                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2552                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2553                 }
2554                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2555                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2556
2557 skip_credits:
2558                 hdr_iov = num_iov;
2559                 iov[num_iov].iov_base = state->smb2.hdr;
2560                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2561                 num_iov += 1;
2562
2563                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2564                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2565                 num_iov += 1;
2566
2567                 if (state->smb2.dyn != NULL) {
2568                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2569                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2570                         num_iov += 1;
2571                 }
2572
2573                 reqlen  = sizeof(state->smb2.hdr);
2574                 reqlen += state->smb2.fixed_len;
2575                 reqlen += state->smb2.dyn_len;
2576
2577                 if (i < num_reqs-1) {
2578                         if ((reqlen % 8) > 0) {
2579                                 uint8_t pad = 8 - (reqlen % 8);
2580                                 iov[num_iov].iov_base = state->smb2.pad;
2581                                 iov[num_iov].iov_len = pad;
2582                                 num_iov += 1;
2583                                 reqlen += pad;
2584                         }
2585                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2586                 }
2587                 nbt_len += reqlen;
2588
2589                 if (state->session) {
2590                         should_sign = state->session->smb2.should_sign;
2591                         if (state->session->smb2.channel_setup) {
2592                                 should_sign = true;
2593                         }
2594                 }
2595
2596                 if (should_sign) {
2597                         NTSTATUS status;
2598
2599                         status = smb2_signing_sign_pdu(state->session->smb2.signing_key,
2600                                                        &iov[hdr_iov], num_iov - hdr_iov);
2601                         if (!NT_STATUS_IS_OK(status)) {
2602                                 return status;
2603                         }
2604                 }
2605
2606                 ret = smbXcli_req_set_pending(reqs[i]);
2607                 if (!ret) {
2608                         return NT_STATUS_NO_MEMORY;
2609                 }
2610         }
2611
2612         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2613         _smb_setlen_tcp(state->length_hdr, nbt_len);
2614         iov[0].iov_base = state->length_hdr;
2615         iov[0].iov_len  = sizeof(state->length_hdr);
2616
2617         if (state->conn->dispatch_incoming == NULL) {
2618                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2619         }
2620
2621         subreq = writev_send(state, state->ev, state->conn->outgoing,
2622                              state->conn->write_fd, false, iov, num_iov);
2623         if (subreq == NULL) {
2624                 return NT_STATUS_NO_MEMORY;
2625         }
2626         tevent_req_set_callback(subreq, smb2cli_req_writev_done, reqs[0]);
2627         return NT_STATUS_OK;
2628 }
2629
2630 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
2631 {
2632         struct smbXcli_req_state *state =
2633                 tevent_req_data(req,
2634                 struct smbXcli_req_state);
2635
2636         state->smb2.credit_charge = charge;
2637 }
2638
2639 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
2640                                     struct tevent_context *ev,
2641                                     struct smbXcli_conn *conn,
2642                                     uint16_t cmd,
2643                                     uint32_t additional_flags,
2644                                     uint32_t clear_flags,
2645                                     uint32_t timeout_msec,
2646                                     uint32_t pid,
2647                                     uint32_t tid,
2648                                     struct smbXcli_session *session,
2649                                     const uint8_t *fixed,
2650                                     uint16_t fixed_len,
2651                                     const uint8_t *dyn,
2652                                     uint32_t dyn_len)
2653 {
2654         struct tevent_req *req;
2655         NTSTATUS status;
2656
2657         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
2658                                  additional_flags, clear_flags,
2659                                  timeout_msec,
2660                                  pid, tid, session,
2661                                  fixed, fixed_len, dyn, dyn_len);
2662         if (req == NULL) {
2663                 return NULL;
2664         }
2665         if (!tevent_req_is_in_progress(req)) {
2666                 return tevent_req_post(req, ev);
2667         }
2668         status = smb2cli_req_compound_submit(&req, 1);
2669         if (tevent_req_nterror(req, status)) {
2670                 return tevent_req_post(req, ev);
2671         }
2672         return req;
2673 }
2674
2675 static void smb2cli_req_writev_done(struct tevent_req *subreq)
2676 {
2677         struct tevent_req *req =
2678                 tevent_req_callback_data(subreq,
2679                 struct tevent_req);
2680         struct smbXcli_req_state *state =
2681                 tevent_req_data(req,
2682                 struct smbXcli_req_state);
2683         ssize_t nwritten;
2684         int err;
2685
2686         nwritten = writev_recv(subreq, &err);
2687         TALLOC_FREE(subreq);
2688         if (nwritten == -1) {
2689                 /* here, we need to notify all pending requests */
2690                 NTSTATUS status = map_nt_error_from_unix_common(err);
2691                 smbXcli_conn_disconnect(state->conn, status);
2692                 return;
2693         }
2694 }
2695
2696 static NTSTATUS smb2cli_inbuf_parse_compound(uint8_t *buf, TALLOC_CTX *mem_ctx,
2697                                              struct iovec **piov, int *pnum_iov)
2698 {
2699         struct iovec *iov;
2700         int num_iov;
2701         size_t buflen;
2702         size_t taken;
2703         uint8_t *first_hdr;
2704
2705         num_iov = 0;
2706
2707         iov = talloc_array(mem_ctx, struct iovec, num_iov);
2708         if (iov == NULL) {
2709                 return NT_STATUS_NO_MEMORY;
2710         }
2711
2712         buflen = smb_len_tcp(buf);
2713         taken = 0;
2714         first_hdr = buf + NBT_HDR_SIZE;
2715
2716         while (taken < buflen) {
2717                 size_t len = buflen - taken;
2718                 uint8_t *hdr = first_hdr + taken;
2719                 struct iovec *cur;
2720                 size_t full_size;
2721                 size_t next_command_ofs;
2722                 uint16_t body_size;
2723                 struct iovec *iov_tmp;
2724
2725                 /*
2726                  * We need the header plus the body length field
2727                  */
2728
2729                 if (len < SMB2_HDR_BODY + 2) {
2730                         DEBUG(10, ("%d bytes left, expected at least %d\n",
2731                                    (int)len, SMB2_HDR_BODY));
2732                         goto inval;
2733                 }
2734                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
2735                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
2736                                    IVAL(hdr, 0)));
2737                         goto inval;
2738                 }
2739                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
2740                         DEBUG(10, ("Got HDR len %d, expected %d\n",
2741                                    SVAL(hdr, 4), SMB2_HDR_BODY));
2742                         goto inval;
2743                 }
2744
2745                 full_size = len;
2746                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
2747                 body_size = SVAL(hdr, SMB2_HDR_BODY);
2748
2749                 if (next_command_ofs != 0) {
2750                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
2751                                 goto inval;
2752                         }
2753                         if (next_command_ofs > full_size) {
2754                                 goto inval;
2755                         }
2756                         full_size = next_command_ofs;
2757                 }
2758                 if (body_size < 2) {
2759                         goto inval;
2760                 }
2761                 body_size &= 0xfffe;
2762
2763                 if (body_size > (full_size - SMB2_HDR_BODY)) {
2764                         goto inval;
2765                 }
2766
2767                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
2768                                          num_iov + 3);
2769                 if (iov_tmp == NULL) {
2770                         TALLOC_FREE(iov);
2771                         return NT_STATUS_NO_MEMORY;
2772                 }
2773                 iov = iov_tmp;
2774                 cur = &iov[num_iov];
2775                 num_iov += 3;
2776
2777                 cur[0].iov_base = hdr;
2778                 cur[0].iov_len  = SMB2_HDR_BODY;
2779                 cur[1].iov_base = hdr + SMB2_HDR_BODY;
2780                 cur[1].iov_len  = body_size;
2781                 cur[2].iov_base = hdr + SMB2_HDR_BODY + body_size;
2782                 cur[2].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
2783
2784                 taken += full_size;
2785         }
2786
2787         *piov = iov;
2788         *pnum_iov = num_iov;
2789         return NT_STATUS_OK;
2790
2791 inval:
2792         TALLOC_FREE(iov);
2793         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2794 }
2795
2796 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
2797                                                     uint64_t mid)
2798 {
2799         size_t num_pending = talloc_array_length(conn->pending);
2800         size_t i;
2801
2802         for (i=0; i<num_pending; i++) {
2803                 struct tevent_req *req = conn->pending[i];
2804                 struct smbXcli_req_state *state =
2805                         tevent_req_data(req,
2806                         struct smbXcli_req_state);
2807
2808                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
2809                         return req;
2810                 }
2811         }
2812         return NULL;
2813 }
2814
2815 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2816                                                TALLOC_CTX *tmp_mem,
2817                                                uint8_t *inbuf)
2818 {
2819         struct tevent_req *req;
2820         struct smbXcli_req_state *state = NULL;
2821         struct iovec *iov;
2822         int i, num_iov;
2823         NTSTATUS status;
2824         bool defer = true;
2825         struct smbXcli_session *last_session = NULL;
2826
2827         status = smb2cli_inbuf_parse_compound(inbuf, tmp_mem,
2828                                               &iov, &num_iov);
2829         if (!NT_STATUS_IS_OK(status)) {
2830                 return status;
2831         }
2832
2833         for (i=0; i<num_iov; i+=3) {
2834                 uint8_t *inbuf_ref = NULL;
2835                 struct iovec *cur = &iov[i];
2836                 uint8_t *inhdr = (uint8_t *)cur[0].iov_base;
2837                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
2838                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
2839                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
2840                 uint16_t req_opcode;
2841                 uint32_t req_flags;
2842                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
2843                 uint32_t new_credits;
2844                 struct smbXcli_session *session = NULL;
2845                 const DATA_BLOB *signing_key = NULL;
2846                 bool should_sign = false;
2847
2848                 new_credits = conn->smb2.cur_credits;
2849                 new_credits += credits;
2850                 if (new_credits > UINT16_MAX) {
2851                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2852                 }
2853                 conn->smb2.cur_credits += credits;
2854
2855                 req = smb2cli_conn_find_pending(conn, mid);
2856                 if (req == NULL) {
2857                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2858                 }
2859                 state = tevent_req_data(req, struct smbXcli_req_state);
2860
2861                 state->smb2.got_async = false;
2862
2863                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2864                 if (opcode != req_opcode) {
2865                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2866                 }
2867                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2868
2869                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
2870                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2871                 }
2872
2873                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
2874                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
2875                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
2876                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
2877
2878                         /*
2879                          * async interim responses are not signed,
2880                          * even if the SMB2_HDR_FLAG_SIGNED flag
2881                          * is set.
2882                          */
2883                         req_flags |= SMB2_HDR_FLAG_ASYNC;
2884                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
2885                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
2886
2887                         if (state->smb2.notify_async) {
2888                                 state->smb2.got_async = true;
2889                                 tevent_req_defer_callback(req, state->ev);
2890                                 tevent_req_notify_callback(req);
2891                         }
2892                         continue;
2893                 }
2894
2895                 session = state->session;
2896                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
2897                         session = last_session;
2898                 }
2899                 last_session = session;
2900
2901                 if (session) {
2902                         should_sign = session->smb2.should_sign;
2903                         if (session->smb2.channel_setup) {
2904                                 should_sign = true;
2905                         }
2906                 }
2907
2908                 if (should_sign) {
2909                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
2910                                 return NT_STATUS_ACCESS_DENIED;
2911                         }
2912                 }
2913
2914                 if (flags & SMB2_HDR_FLAG_SIGNED) {
2915                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
2916
2917                         if (session == NULL) {
2918                                 struct smbXcli_session *s;
2919
2920                                 s = state->conn->sessions;
2921                                 for (; s; s = s->next) {
2922                                         if (s->smb2.session_id != uid) {
2923                                                 continue;
2924                                         }
2925
2926                                         session = s;
2927                                         break;
2928                                 }
2929                         }
2930
2931                         if (session == NULL) {
2932                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2933                         }
2934
2935                         last_session = session;
2936                         signing_key = &session->smb2.signing_key;
2937                 }
2938
2939                 if ((opcode == SMB2_OP_SESSSETUP) &&
2940                      NT_STATUS_IS_OK(status)) {
2941                         /*
2942                          * the caller has to check the signing
2943                          * as only the caller knows the correct
2944                          * session key
2945                          */
2946                         signing_key = NULL;
2947                 }
2948
2949                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
2950                         /*
2951                          * if the server returns NT_STATUS_USER_SESSION_DELETED
2952                          * the response is not signed and we should
2953                          * propagate the NT_STATUS_USER_SESSION_DELETED
2954                          * status to the caller.
2955                          */
2956                         if (signing_key) {
2957                                 signing_key = NULL;
2958                         }
2959                 }
2960
2961                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
2962                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
2963                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
2964                         /*
2965                          * if the server returns
2966                          * NT_STATUS_NETWORK_NAME_DELETED
2967                          * NT_STATUS_FILE_CLOSED
2968                          * NT_STATUS_INVALID_PARAMETER
2969                          * the response might not be signed
2970                          * as this happens before the signing checks.
2971                          *
2972                          * If server echos the signature (or all zeros)
2973                          * we should report the status from the server
2974                          * to the caller.
2975                          */
2976                         if (signing_key) {
2977                                 int cmp;
2978
2979                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2980                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
2981                                              16);
2982                                 if (cmp == 0) {
2983                                         state->smb2.signing_skipped = true;
2984                                         signing_key = NULL;
2985                                 }
2986                         }
2987                         if (signing_key) {
2988                                 int cmp;
2989                                 static const uint8_t zeros[16];
2990
2991                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2992                                              zeros,
2993                                              16);
2994                                 if (cmp == 0) {
2995                                         state->smb2.signing_skipped = true;
2996                                         signing_key = NULL;
2997                                 }
2998                         }
2999                 }
3000
3001                 if (signing_key) {
3002                         status = smb2_signing_check_pdu(*signing_key, cur, 3);
3003                         if (!NT_STATUS_IS_OK(status)) {
3004                                 /*
3005                                  * If the signing check fails, we disconnect
3006                                  * the connection.
3007                                  */
3008                                 return status;
3009                         }
3010                 }
3011
3012                 smbXcli_req_unset_pending(req);
3013
3014                 /*
3015                  * There might be more than one response
3016                  * we need to defer the notifications
3017                  */
3018                 if ((num_iov == 4) && (talloc_array_length(conn->pending) == 0)) {
3019                         defer = false;
3020                 }
3021
3022                 if (defer) {
3023                         tevent_req_defer_callback(req, state->ev);
3024                 }
3025
3026                 /*
3027                  * Note: here we use talloc_reference() in a way
3028                  *       that does not expose it to the caller.
3029                  */
3030                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
3031                 if (tevent_req_nomem(inbuf_ref, req)) {
3032                         continue;
3033                 }
3034
3035                 /* copy the related buffers */
3036                 state->smb2.recv_iov[0] = cur[0];
3037                 state->smb2.recv_iov[1] = cur[1];
3038                 state->smb2.recv_iov[2] = cur[2];
3039
3040                 tevent_req_done(req);
3041         }
3042
3043         if (defer) {
3044                 return NT_STATUS_RETRY;
3045         }
3046
3047         return NT_STATUS_OK;
3048 }
3049
3050 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
3051                           struct iovec **piov,
3052                           const struct smb2cli_req_expected_response *expected,
3053                           size_t num_expected)
3054 {
3055         struct smbXcli_req_state *state =
3056                 tevent_req_data(req,
3057                 struct smbXcli_req_state);
3058         NTSTATUS status;
3059         size_t body_size;
3060         bool found_status = false;
3061         bool found_size = false;
3062         size_t i;
3063
3064         if (piov != NULL) {
3065                 *piov = NULL;
3066         }
3067
3068         if (state->smb2.got_async) {
3069                 return STATUS_PENDING;
3070         }
3071
3072         if (tevent_req_is_nterror(req, &status)) {
3073                 for (i=0; i < num_expected; i++) {
3074                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
3075                                 found_status = true;
3076                                 break;
3077                         }
3078                 }
3079
3080                 if (found_status) {
3081                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
3082                 }
3083
3084                 return status;
3085         }
3086
3087         if (num_expected == 0) {
3088                 found_status = true;
3089                 found_size = true;
3090         }
3091
3092         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
3093         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
3094
3095         for (i=0; i < num_expected; i++) {
3096                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
3097                         continue;
3098                 }
3099
3100                 found_status = true;
3101                 if (expected[i].body_size == 0) {
3102                         found_size = true;
3103                         break;
3104                 }
3105
3106                 if (expected[i].body_size == body_size) {
3107                         found_size = true;
3108                         break;
3109                 }
3110         }
3111
3112         if (!found_status) {
3113                 return status;
3114         }
3115
3116         if (state->smb2.signing_skipped) {
3117                 if (num_expected > 0) {
3118                         return NT_STATUS_ACCESS_DENIED;
3119                 }
3120                 if (!NT_STATUS_IS_ERR(status)) {
3121                         return NT_STATUS_ACCESS_DENIED;
3122                 }
3123         }
3124
3125         if (!found_size) {
3126                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
3127         }
3128
3129         if (piov != NULL) {
3130                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
3131         }
3132
3133         return status;
3134 }
3135
3136 static const struct {
3137         enum protocol_types proto;
3138         const char *smb1_name;
3139 } smb1cli_prots[] = {
3140         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
3141         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
3142         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
3143         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
3144         {PROTOCOL_LANMAN2,      "LM1.2X002"},
3145         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
3146         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
3147         {PROTOCOL_LANMAN2,      "Samba"},
3148         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
3149         {PROTOCOL_NT1,          "NT LM 0.12"},
3150         {PROTOCOL_SMB2_02,      "SMB 2.002"},
3151         {PROTOCOL_SMB2_10,      "SMB 2.???"},
3152 };
3153
3154 static const struct {
3155         enum protocol_types proto;
3156         uint16_t smb2_dialect;
3157 } smb2cli_prots[] = {
3158         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
3159         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
3160         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
3161         {PROTOCOL_SMB2_24,      SMB2_DIALECT_REVISION_224},
3162 };
3163
3164 struct smbXcli_negprot_state {
3165         struct smbXcli_conn *conn;
3166         struct tevent_context *ev;
3167         uint32_t timeout_msec;
3168         enum protocol_types min_protocol;
3169         enum protocol_types max_protocol;
3170
3171         struct {
3172                 uint8_t fixed[36];
3173                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
3174         } smb2;
3175 };
3176
3177 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
3178 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
3179 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
3180 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
3181 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
3182 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3183                                                   TALLOC_CTX *frame,
3184                                                   uint8_t *inbuf);
3185
3186 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
3187                                         struct tevent_context *ev,
3188                                         struct smbXcli_conn *conn,
3189                                         uint32_t timeout_msec,
3190                                         enum protocol_types min_protocol,
3191                                         enum protocol_types max_protocol)
3192 {
3193         struct tevent_req *req, *subreq;
3194         struct smbXcli_negprot_state *state;
3195
3196         req = tevent_req_create(mem_ctx, &state,
3197                                 struct smbXcli_negprot_state);
3198         if (req == NULL) {
3199                 return NULL;
3200         }
3201         state->conn = conn;
3202         state->ev = ev;
3203         state->timeout_msec = timeout_msec;
3204         state->min_protocol = min_protocol;
3205         state->max_protocol = max_protocol;
3206
3207         if (min_protocol == PROTOCOL_NONE) {
3208                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3209                 return tevent_req_post(req, ev);
3210         }
3211
3212         if (max_protocol == PROTOCOL_NONE) {
3213                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3214                 return tevent_req_post(req, ev);
3215         }
3216
3217         if (min_protocol > max_protocol) {
3218                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
3219                 return tevent_req_post(req, ev);
3220         }
3221
3222         if ((min_protocol < PROTOCOL_SMB2_02) &&
3223             (max_protocol < PROTOCOL_SMB2_02)) {
3224                 /*
3225                  * SMB1 only...
3226                  */
3227                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3228
3229                 subreq = smbXcli_negprot_smb1_subreq(state);
3230                 if (tevent_req_nomem(subreq, req)) {
3231                         return tevent_req_post(req, ev);
3232                 }
3233                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3234                 return req;
3235         }
3236
3237         if ((min_protocol >= PROTOCOL_SMB2_02) &&
3238             (max_protocol >= PROTOCOL_SMB2_02)) {
3239                 /*
3240                  * SMB2 only...
3241                  */
3242                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3243
3244                 subreq = smbXcli_negprot_smb2_subreq(state);
3245                 if (tevent_req_nomem(subreq, req)) {
3246                         return tevent_req_post(req, ev);
3247                 }
3248                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3249                 return req;
3250         }
3251
3252         /*
3253          * We send an SMB1 negprot with the SMB2 dialects
3254          * and expect a SMB1 or a SMB2 response.
3255          *
3256          * smbXcli_negprot_dispatch_incoming() will fix the
3257          * callback to match protocol of the response.
3258          */
3259         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
3260
3261         subreq = smbXcli_negprot_smb1_subreq(state);
3262         if (tevent_req_nomem(subreq, req)) {
3263                 return tevent_req_post(req, ev);
3264         }
3265         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
3266         return req;
3267 }
3268
3269 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
3270 {
3271         struct tevent_req *req =
3272                 tevent_req_callback_data(subreq,
3273                 struct tevent_req);
3274         NTSTATUS status;
3275
3276         /*
3277          * we just want the low level error
3278          */
3279         status = tevent_req_simple_recv_ntstatus(subreq);
3280         TALLOC_FREE(subreq);
3281         if (tevent_req_nterror(req, status)) {
3282                 return;
3283         }
3284
3285         /* this should never happen */
3286         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
3287 }
3288
3289 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
3290 {
3291         size_t i;
3292         DATA_BLOB bytes = data_blob_null;
3293         uint8_t flags;
3294         uint16_t flags2;
3295
3296         /* setup the protocol strings */
3297         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3298                 uint8_t c = 2;
3299                 bool ok;
3300
3301                 if (smb1cli_prots[i].proto < state->min_protocol) {
3302                         continue;
3303                 }
3304
3305                 if (smb1cli_prots[i].proto > state->max_protocol) {
3306                         continue;
3307                 }
3308
3309                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
3310                 if (!ok) {
3311                         return NULL;
3312                 }
3313
3314                 /*
3315                  * We now it is already ascii and
3316                  * we want NULL termination.
3317                  */
3318                 ok = data_blob_append(state, &bytes,
3319                                       smb1cli_prots[i].smb1_name,
3320                                       strlen(smb1cli_prots[i].smb1_name)+1);
3321                 if (!ok) {
3322                         return NULL;
3323                 }
3324         }
3325
3326         smb1cli_req_flags(state->max_protocol,
3327                           state->conn->smb1.client.capabilities,
3328                           SMBnegprot,
3329                           0, 0, &flags,
3330                           0, 0, &flags2);
3331
3332         return smb1cli_req_send(state, state->ev, state->conn,
3333                                 SMBnegprot,
3334                                 flags, ~flags,
3335                                 flags2, ~flags2,
3336                                 state->timeout_msec,
3337                                 0xFFFE, 0, 0, /* pid, tid, uid */
3338                                 0, NULL, /* wct, vwv */
3339                                 bytes.length, bytes.data);
3340 }
3341
3342 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
3343 {
3344         struct tevent_req *req =
3345                 tevent_req_callback_data(subreq,
3346                 struct tevent_req);
3347         struct smbXcli_negprot_state *state =
3348                 tevent_req_data(req,
3349                 struct smbXcli_negprot_state);
3350         struct smbXcli_conn *conn = state->conn;
3351         struct iovec *recv_iov = NULL;
3352         uint8_t *inhdr;
3353         uint8_t wct;
3354         uint16_t *vwv;
3355         uint32_t num_bytes;
3356         uint8_t *bytes;
3357         NTSTATUS status;
3358         uint16_t protnum;
3359         size_t i;
3360         size_t num_prots = 0;
3361         uint8_t flags;
3362         uint32_t client_capabilities = conn->smb1.client.capabilities;
3363         uint32_t both_capabilities;
3364         uint32_t server_capabilities = 0;
3365         uint32_t capabilities;
3366         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
3367         uint32_t server_max_xmit = 0;
3368         uint32_t max_xmit;
3369         uint32_t server_max_mux = 0;
3370         uint16_t server_security_mode = 0;
3371         uint32_t server_session_key = 0;
3372         bool server_readbraw = false;
3373         bool server_writebraw = false;
3374         bool server_lockread = false;
3375         bool server_writeunlock = false;
3376         struct GUID server_guid = GUID_zero();
3377         DATA_BLOB server_gss_blob = data_blob_null;
3378         uint8_t server_challenge[8];
3379         char *server_workgroup = NULL;
3380         char *server_name = NULL;
3381         int server_time_zone = 0;
3382         NTTIME server_system_time = 0;
3383         static const struct smb1cli_req_expected_response expected[] = {
3384         {
3385                 .status = NT_STATUS_OK,
3386                 .wct = 0x11, /* NT1 */
3387         },
3388         {
3389                 .status = NT_STATUS_OK,
3390                 .wct = 0x0D, /* LM */
3391         },
3392         {
3393                 .status = NT_STATUS_OK,
3394                 .wct = 0x01, /* CORE */
3395         }
3396         };
3397
3398         ZERO_STRUCT(server_challenge);
3399
3400         status = smb1cli_req_recv(subreq, state,
3401                                   &recv_iov,
3402                                   &inhdr,
3403                                   &wct,
3404                                   &vwv,
3405                                   NULL, /* pvwv_offset */
3406                                   &num_bytes,
3407                                   &bytes,
3408                                   NULL, /* pbytes_offset */
3409                                   NULL, /* pinbuf */
3410                                   expected, ARRAY_SIZE(expected));
3411         TALLOC_FREE(subreq);
3412         if (tevent_req_nterror(req, status)) {
3413                 return;
3414         }
3415
3416         flags = CVAL(inhdr, HDR_FLG);
3417
3418         protnum = SVAL(vwv, 0);
3419
3420         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3421                 if (smb1cli_prots[i].proto < state->min_protocol) {
3422                         continue;
3423                 }
3424
3425                 if (smb1cli_prots[i].proto > state->max_protocol) {
3426                         continue;
3427                 }
3428
3429                 if (protnum != num_prots) {
3430                         num_prots++;
3431                         continue;
3432                 }
3433
3434                 conn->protocol = smb1cli_prots[i].proto;
3435                 break;
3436         }
3437
3438         if (conn->protocol == PROTOCOL_NONE) {
3439                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3440                 return;
3441         }
3442
3443         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
3444                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
3445                          "and the selected protocol level doesn't support it.\n"));
3446                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3447                 return;
3448         }
3449
3450         if (flags & FLAG_SUPPORT_LOCKREAD) {
3451                 server_lockread = true;
3452                 server_writeunlock = true;
3453         }
3454
3455         if (conn->protocol >= PROTOCOL_NT1) {
3456                 const char *client_signing = NULL;
3457                 bool server_mandatory = false;
3458                 bool server_allowed = false;
3459                 const char *server_signing = NULL;
3460                 bool ok;
3461                 uint8_t key_len;
3462
3463                 if (wct != 0x11) {
3464                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3465                         return;
3466                 }
3467
3468                 /* NT protocol */
3469                 server_security_mode = CVAL(vwv + 1, 0);
3470                 server_max_mux = SVAL(vwv + 1, 1);
3471                 server_max_xmit = IVAL(vwv + 3, 1);
3472                 server_session_key = IVAL(vwv + 7, 1);
3473                 server_time_zone = SVALS(vwv + 15, 1);
3474                 server_time_zone *= 60;
3475                 /* this time arrives in real GMT */
3476                 server_system_time = BVAL(vwv + 11, 1);
3477                 server_capabilities = IVAL(vwv + 9, 1);
3478
3479                 key_len = CVAL(vwv + 16, 1);
3480
3481                 if (server_capabilities & CAP_RAW_MODE) {
3482                         server_readbraw = true;
3483                         server_writebraw = true;
3484                 }
3485                 if (server_capabilities & CAP_LOCK_AND_READ) {
3486                         server_lockread = true;
3487                 }
3488
3489                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
3490                         DATA_BLOB blob1, blob2;
3491
3492                         if (num_bytes < 16) {
3493                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3494                                 return;
3495                         }
3496
3497                         blob1 = data_blob_const(bytes, 16);
3498                         status = GUID_from_data_blob(&blob1, &server_guid);
3499                         if (tevent_req_nterror(req, status)) {
3500                                 return;
3501                         }
3502
3503                         blob1 = data_blob_const(bytes+16, num_bytes-16);
3504                         blob2 = data_blob_dup_talloc(state, blob1);
3505                         if (blob1.length > 0 &&
3506                             tevent_req_nomem(blob2.data, req)) {
3507                                 return;
3508                         }
3509                         server_gss_blob = blob2;
3510                 } else {
3511                         DATA_BLOB blob1, blob2;
3512
3513                         if (num_bytes < key_len) {
3514                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3515                                 return;
3516                         }
3517
3518                         if (key_len != 0 && key_len != 8) {
3519                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3520                                 return;
3521                         }
3522
3523                         if (key_len == 8) {
3524                                 memcpy(server_challenge, bytes, 8);
3525                         }
3526
3527                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3528                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
3529                         if (blob1.length > 0) {
3530                                 size_t len;
3531
3532                                 len = utf16_len_n(blob1.data,
3533                                                   blob1.length);
3534                                 blob1.length = len;
3535
3536                                 ok = convert_string_talloc(state,
3537                                                            CH_UTF16LE,
3538                                                            CH_UNIX,
3539                                                            blob1.data,
3540                                                            blob1.length,
3541                                                            &server_workgroup,
3542                                                            &len);
3543                                 if (!ok) {
3544                                         status = map_nt_error_from_unix_common(errno);
3545                                         tevent_req_nterror(req, status);
3546                                         return;
3547                                 }
3548                         }
3549
3550                         blob2.data += blob1.length;
3551                         blob2.length -= blob1.length;
3552                         if (blob2.length > 0) {
3553                                 size_t len;
3554
3555                                 len = utf16_len_n(blob1.data,
3556                                                   blob1.length);
3557                                 blob1.length = len;
3558
3559                                 ok = convert_string_talloc(state,
3560                                                            CH_UTF16LE,
3561                                                            CH_UNIX,
3562                                                            blob2.data,
3563                                                            blob2.length,
3564                                                            &server_name,
3565                                                            &len);
3566                                 if (!ok) {
3567                                         status = map_nt_error_from_unix_common(errno);
3568                                         tevent_req_nterror(req, status);
3569                                         return;
3570                                 }
3571                         }
3572                 }
3573
3574                 client_signing = "disabled";
3575                 if (conn->allow_signing) {
3576                         client_signing = "allowed";
3577                 }
3578                 if (conn->mandatory_signing) {
3579                         client_signing = "required";
3580                 }
3581
3582                 server_signing = "not supported";
3583                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
3584                         server_signing = "supported";
3585                         server_allowed = true;
3586                 }
3587                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
3588                         server_signing = "required";
3589                         server_mandatory = true;
3590                 }
3591
3592                 ok = smb_signing_set_negotiated(conn->smb1.signing,
3593                                                 server_allowed,
3594                                                 server_mandatory);
3595                 if (!ok) {
3596                         DEBUG(1,("cli_negprot: SMB signing is required, "
3597                                  "but client[%s] and server[%s] mismatch\n",
3598                                  client_signing, server_signing));
3599                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3600                         return;
3601                 }
3602
3603         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
3604                 DATA_BLOB blob1;
3605                 uint8_t key_len;
3606                 time_t t;
3607
3608                 if (wct != 0x0D) {
3609                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3610                         return;
3611                 }
3612
3613                 server_security_mode = SVAL(vwv + 1, 0);
3614                 server_max_xmit = SVAL(vwv + 2, 0);
3615                 server_max_mux = SVAL(vwv + 3, 0);
3616                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
3617                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
3618                 server_session_key = IVAL(vwv + 6, 0);
3619                 server_time_zone = SVALS(vwv + 10, 0);
3620                 server_time_zone *= 60;
3621                 /* this time is converted to GMT by make_unix_date */
3622                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
3623                 unix_to_nt_time(&server_system_time, t);
3624                 key_len = SVAL(vwv + 11, 0);
3625
3626                 if (num_bytes < key_len) {
3627                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3628                         return;
3629                 }
3630
3631                 if (key_len != 0 && key_len != 8) {
3632                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3633                         return;
3634                 }
3635
3636                 if (key_len == 8) {
3637                         memcpy(server_challenge, bytes, 8);
3638                 }
3639
3640                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3641                 if (blob1.length > 0) {
3642                         size_t len;
3643                         bool ok;
3644
3645                         len = utf16_len_n(blob1.data,
3646                                           blob1.length);
3647                         blob1.length = len;
3648
3649                         ok = convert_string_talloc(state,
3650                                                    CH_DOS,
3651                                                    CH_UNIX,
3652                                                    blob1.data,
3653                                                    blob1.length,
3654                                                    &server_workgroup,
3655                                                    &len);
3656                         if (!ok) {
3657                                 status = map_nt_error_from_unix_common(errno);
3658                                 tevent_req_nterror(req, status);
3659                                 return;
3660                         }
3661                 }
3662
3663         } else {
3664                 /* the old core protocol */
3665                 server_time_zone = get_time_zone(time(NULL));
3666                 server_max_xmit = 1024;
3667                 server_max_mux = 1;
3668         }
3669
3670         if (server_max_xmit < 1024) {
3671                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3672                 return;
3673         }
3674
3675         if (server_max_mux < 1) {
3676                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3677                 return;
3678         }
3679
3680         /*
3681          * Now calculate the negotiated capabilities
3682          * based on the mask for:
3683          * - client only flags
3684          * - flags used in both directions
3685          * - server only flags
3686          */
3687         both_capabilities = client_capabilities & server_capabilities;
3688         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
3689         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
3690         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
3691
3692         max_xmit = MIN(client_max_xmit, server_max_xmit);
3693
3694         conn->smb1.server.capabilities = server_capabilities;
3695         conn->smb1.capabilities = capabilities;
3696
3697         conn->smb1.server.max_xmit = server_max_xmit;
3698         conn->smb1.max_xmit = max_xmit;
3699
3700         conn->smb1.server.max_mux = server_max_mux;
3701
3702         conn->smb1.server.security_mode = server_security_mode;
3703
3704         conn->smb1.server.readbraw = server_readbraw;
3705         conn->smb1.server.writebraw = server_writebraw;
3706         conn->smb1.server.lockread = server_lockread;
3707         conn->smb1.server.writeunlock = server_writeunlock;
3708
3709         conn->smb1.server.session_key = server_session_key;
3710
3711         talloc_steal(conn, server_gss_blob.data);
3712         conn->smb1.server.gss_blob = server_gss_blob;
3713         conn->smb1.server.guid = server_guid;
3714         memcpy(conn->smb1.server.challenge, server_challenge, 8);
3715         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
3716         conn->smb1.server.name = talloc_move(conn, &server_name);
3717
3718         conn->smb1.server.time_zone = server_time_zone;
3719         conn->smb1.server.system_time = server_system_time;
3720
3721         tevent_req_done(req);
3722 }
3723
3724 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
3725 {
3726         size_t i;
3727         uint8_t *buf;
3728         uint16_t dialect_count = 0;
3729
3730         buf = state->smb2.dyn;
3731         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3732                 if (smb2cli_prots[i].proto < state->min_protocol) {
3733                         continue;
3734                 }
3735
3736                 if (smb2cli_prots[i].proto > state->max_protocol) {
3737                         continue;
3738                 }
3739
3740                 SSVAL(buf, dialect_count*2, smb2cli_prots[i].smb2_dialect);
3741                 dialect_count++;
3742         }
3743
3744         buf = state->smb2.fixed;
3745         SSVAL(buf, 0, 36);
3746         SSVAL(buf, 2, dialect_count);
3747         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
3748         SSVAL(buf, 6, 0);       /* Reserved */
3749         SSVAL(buf, 8, 0);       /* Capabilities */
3750         if (state->max_protocol >= PROTOCOL_SMB2_10) {
3751                 NTSTATUS status;
3752                 DATA_BLOB blob;
3753
3754                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
3755                                           state, &blob);
3756                 if (!NT_STATUS_IS_OK(status)) {
3757                         return NULL;
3758                 }
3759                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
3760         } else {
3761                 memset(buf+12, 0, 16);  /* ClientGuid */
3762         }
3763         SBVAL(buf, 28, 0);      /* ClientStartTime */
3764
3765         return smb2cli_req_send(state, state->ev,
3766                                 state->conn, SMB2_OP_NEGPROT,
3767                                 0, 0, /* flags */
3768                                 state->timeout_msec,
3769                                 0xFEFF, 0, NULL, /* pid, tid, session */
3770                                 state->smb2.fixed, sizeof(state->smb2.fixed),
3771                                 state->smb2.dyn, dialect_count*2);
3772 }
3773
3774 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
3775 {
3776         struct tevent_req *req =
3777                 tevent_req_callback_data(subreq,
3778                 struct tevent_req);
3779         struct smbXcli_negprot_state *state =
3780                 tevent_req_data(req,
3781                 struct smbXcli_negprot_state);
3782         struct smbXcli_conn *conn = state->conn;
3783         size_t security_offset, security_length;
3784         DATA_BLOB blob;
3785         NTSTATUS status;
3786         struct iovec *iov;
3787         uint8_t *body;
3788         size_t i;
3789         uint16_t dialect_revision;
3790         static const struct smb2cli_req_expected_response expected[] = {
3791         {
3792                 .status = NT_STATUS_OK,
3793                 .body_size = 0x41
3794         }
3795         };
3796
3797         status = smb2cli_req_recv(subreq, state, &iov,
3798                                   expected, ARRAY_SIZE(expected));
3799         TALLOC_FREE(subreq);
3800         if (tevent_req_nterror(req, status)) {
3801                 return;
3802         }
3803
3804         body = (uint8_t *)iov[1].iov_base;
3805
3806         dialect_revision = SVAL(body, 4);
3807
3808         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3809                 if (smb2cli_prots[i].proto < state->min_protocol) {
3810                         continue;
3811                 }
3812
3813                 if (smb2cli_prots[i].proto > state->max_protocol) {
3814                         continue;
3815                 }
3816
3817                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
3818                         continue;
3819                 }
3820
3821                 conn->protocol = smb2cli_prots[i].proto;
3822                 break;
3823         }
3824
3825         if (conn->protocol == PROTOCOL_NONE) {
3826                 if (state->min_protocol >= PROTOCOL_SMB2_02) {
3827                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3828                         return;
3829                 }
3830
3831                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
3832                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3833                         return;
3834                 }
3835
3836                 /* make sure we do not loop forever */
3837                 state->min_protocol = PROTOCOL_SMB2_02;
3838
3839                 /*
3840                  * send a SMB2 negprot, in order to negotiate
3841                  * the SMB2 dialect.
3842                  */
3843                 subreq = smbXcli_negprot_smb2_subreq(state);
3844                 if (tevent_req_nomem(subreq, req)) {
3845                         return;
3846                 }
3847                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3848                 return;
3849         }
3850
3851         conn->smb2.server.security_mode = SVAL(body, 2);
3852
3853         blob = data_blob_const(body + 8, 16);
3854         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
3855         if (tevent_req_nterror(req, status)) {
3856                 return;
3857         }
3858
3859         conn->smb2.server.capabilities  = IVAL(body, 24);
3860         conn->smb2.server.max_trans_size= IVAL(body, 28);
3861         conn->smb2.server.max_read_size = IVAL(body, 32);
3862         conn->smb2.server.max_write_size= IVAL(body, 36);
3863         conn->smb2.server.system_time   = BVAL(body, 40);
3864         conn->smb2.server.start_time    = BVAL(body, 48);
3865
3866         security_offset = SVAL(body, 56);
3867         security_length = SVAL(body, 58);
3868
3869         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
3870                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3871                 return;
3872         }
3873
3874         if (security_length > iov[2].iov_len) {
3875                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3876                 return;
3877         }
3878
3879         conn->smb2.server.gss_blob = data_blob_talloc(conn,
3880                                                 iov[2].iov_base,
3881                                                 security_length);
3882         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
3883                 return;
3884         }
3885
3886         tevent_req_done(req);
3887 }
3888
3889 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3890                                                   TALLOC_CTX *tmp_mem,
3891                                                   uint8_t *inbuf)
3892 {
3893         size_t num_pending = talloc_array_length(conn->pending);
3894         struct tevent_req *subreq;
3895         struct smbXcli_req_state *substate;
3896         struct tevent_req *req;
3897         uint32_t protocol_magic = IVAL(inbuf, 4);
3898
3899         if (num_pending != 1) {
3900                 return NT_STATUS_INTERNAL_ERROR;
3901         }
3902
3903         subreq = conn->pending[0];
3904         substate = tevent_req_data(subreq, struct smbXcli_req_state);
3905         req = tevent_req_callback_data(subreq, struct tevent_req);
3906
3907         switch (protocol_magic) {
3908         case SMB_MAGIC:
3909                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3910                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3911                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3912
3913         case SMB2_MAGIC:
3914                 if (substate->smb2.recv_iov == NULL) {
3915                         /*
3916                          * For the SMB1 negprot we have move it.
3917                          */
3918                         substate->smb2.recv_iov = substate->smb1.recv_iov;
3919                         substate->smb1.recv_iov = NULL;
3920                 }
3921
3922                 /*
3923                  * we got an SMB2 answer, which consumed sequence number 0
3924                  * so we need to use 1 as the next one
3925                  */
3926                 conn->smb2.mid = 1;
3927                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3928                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3929                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3930         }
3931
3932         DEBUG(10, ("Got non-SMB PDU\n"));
3933         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3934 }
3935
3936 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
3937 {
3938         return tevent_req_simple_recv_ntstatus(req);
3939 }
3940
3941 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
3942                          uint32_t timeout_msec,
3943                          enum protocol_types min_protocol,
3944                          enum protocol_types max_protocol)
3945 {
3946         TALLOC_CTX *frame = talloc_stackframe();
3947         struct tevent_context *ev;
3948         struct tevent_req *req;
3949         NTSTATUS status = NT_STATUS_NO_MEMORY;
3950         bool ok;
3951
3952         if (smbXcli_conn_has_async_calls(conn)) {
3953                 /*
3954                  * Can't use sync call while an async call is in flight
3955                  */
3956                 status = NT_STATUS_INVALID_PARAMETER_MIX;
3957                 goto fail;
3958         }
3959         ev = tevent_context_init(frame);
3960         if (ev == NULL) {
3961                 goto fail;
3962         }
3963         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
3964                                    min_protocol, max_protocol);
3965         if (req == NULL) {
3966                 goto fail;
3967         }
3968         ok = tevent_req_poll(req, ev);
3969         if (!ok) {
3970                 status = map_nt_error_from_unix_common(errno);
3971                 goto fail;
3972         }
3973         status = smbXcli_negprot_recv(req);
3974  fail:
3975         TALLOC_FREE(frame);
3976         return status;
3977 }
3978
3979 static int smbXcli_session_destructor(struct smbXcli_session *session)
3980 {
3981         if (session->conn == NULL) {
3982                 return 0;
3983         }
3984
3985         DLIST_REMOVE(session->conn->sessions, session);
3986         return 0;
3987 }
3988
3989 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
3990                                                struct smbXcli_conn *conn)
3991 {
3992         struct smbXcli_session *session;
3993
3994         session = talloc_zero(mem_ctx, struct smbXcli_session);
3995         if (session == NULL) {
3996                 return NULL;
3997         }
3998         talloc_set_destructor(session, smbXcli_session_destructor);
3999
4000         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
4001         session->conn = conn;
4002
4003         return session;
4004 }
4005
4006 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
4007 {
4008         struct smbXcli_conn *conn = session->conn;
4009         uint8_t security_mode = 0;
4010
4011         if (conn == NULL) {
4012                 return security_mode;
4013         }
4014
4015         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
4016         if (conn->mandatory_signing) {
4017                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
4018         }
4019
4020         return security_mode;
4021 }
4022
4023 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
4024 {
4025         return session->smb2.session_id;
4026 }
4027
4028 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
4029                                       uint64_t session_id,
4030                                       uint16_t session_flags)
4031 {
4032         session->smb2.session_id = session_id;
4033         session->smb2.session_flags = session_flags;
4034 }
4035
4036 NTSTATUS smb2cli_session_update_session_key(struct smbXcli_session *session,
4037                                             const DATA_BLOB session_key,
4038                                             const struct iovec *recv_iov)
4039 {
4040         struct smbXcli_conn *conn = session->conn;
4041         uint16_t no_sign_flags;
4042         DATA_BLOB signing_key;
4043         NTSTATUS status;
4044
4045         if (conn == NULL) {
4046                 return NT_STATUS_INVALID_PARAMETER_MIX;
4047         }
4048
4049         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
4050
4051         if (session->smb2.session_flags & no_sign_flags) {
4052                 session->smb2.should_sign = false;
4053                 return NT_STATUS_OK;
4054         }
4055
4056         if (session->smb2.signing_key.length > 0) {
4057                 signing_key = session->smb2.signing_key;
4058         } else {
4059                 signing_key = session_key;
4060         }
4061         if (session->smb2.channel_setup) {
4062                 signing_key = session_key;
4063         }
4064
4065         status = smb2_signing_check_pdu(signing_key, recv_iov, 3);
4066         if (!NT_STATUS_IS_OK(status)) {
4067                 return status;
4068         }
4069
4070         if (!session->smb2.channel_setup) {
4071                 session->smb2.session_key = data_blob_dup_talloc(session,
4072                                                                  session_key);
4073                 if (session->smb2.session_key.data == NULL) {
4074                         return NT_STATUS_NO_MEMORY;
4075                 }
4076         }
4077
4078         if (session->smb2.channel_setup) {
4079                 data_blob_free(&session->smb2.signing_key);
4080                 session->smb2.channel_setup = false;
4081         }
4082
4083         if (session->smb2.signing_key.length > 0) {
4084                 return NT_STATUS_OK;
4085         }
4086
4087         session->smb2.signing_key = data_blob_dup_talloc(session, signing_key);
4088         if (session->smb2.signing_key.data == NULL) {
4089                 return NT_STATUS_NO_MEMORY;
4090         }
4091
4092         session->smb2.should_sign = false;
4093
4094         if (conn->desire_signing) {
4095                 session->smb2.should_sign = true;
4096         }
4097
4098         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
4099                 session->smb2.should_sign = true;
4100         }
4101
4102         return NT_STATUS_OK;
4103 }
4104
4105 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
4106                                         struct smbXcli_session *session1,
4107                                         struct smbXcli_conn *conn,
4108                                         struct smbXcli_session **_session2)
4109 {
4110         struct smbXcli_session *session2;
4111         uint16_t no_sign_flags;
4112
4113         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
4114
4115         if (session1->smb2.session_flags & no_sign_flags) {
4116                 return NT_STATUS_INVALID_PARAMETER_MIX;
4117         }
4118
4119         if (session1->smb2.session_key.length == 0) {
4120                 return NT_STATUS_INVALID_PARAMETER_MIX;
4121         }
4122
4123         if (session1->smb2.signing_key.length == 0) {
4124                 return NT_STATUS_INVALID_PARAMETER_MIX;
4125         }
4126
4127         if (conn == NULL) {
4128                 return NT_STATUS_INVALID_PARAMETER_MIX;
4129         }
4130
4131         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
4132         if (session2 == NULL) {
4133                 return NT_STATUS_NO_MEMORY;
4134         }
4135         session2->smb2.session_id = session1->smb2.session_id;
4136         session2->smb2.session_flags = session1->smb2.session_flags;
4137
4138         session2->smb2.session_key = data_blob_dup_talloc(session2,
4139                                                 session1->smb2.session_key);
4140         if (session2->smb2.session_key.data == NULL) {
4141                 return NT_STATUS_NO_MEMORY;
4142         }
4143
4144         session2->smb2.signing_key = data_blob_dup_talloc(session2,
4145                                                 session1->smb2.signing_key);
4146         if (session2->smb2.signing_key.data == NULL) {
4147                 return NT_STATUS_NO_MEMORY;
4148         }
4149
4150         session2->smb2.should_sign = session1->smb2.should_sign;
4151         session2->smb2.channel_setup = true;
4152
4153         talloc_set_destructor(session2, smbXcli_session_destructor);
4154         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
4155         session2->conn = conn;
4156
4157         *_session2 = session2;
4158         return NT_STATUS_OK;
4159 }