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 fd;
  41         struct sockaddr_storage local_ss;
  42         struct sockaddr_storage remote_ss;
  43         const char *remote_name;
  44
  45         struct tevent_queue *outgoing;
  46         struct tevent_req **pending;
  47         struct tevent_req *read_smb_req;
  48
  49         enum protocol_types protocol;
  50         bool allow_signing;
  51         bool desire_signing;
  52         bool mandatory_signing;
  53
  54         /*
  55          * The incoming dispatch function should return:
  56          * - NT_STATUS_RETRY, if more incoming PDUs are expected.
  57          * - NT_STATUS_OK, if no more processing is desired, e.g.
  58          *                 the dispatch function called
  59          *                 tevent_req_done().
  60          * - All other return values disconnect the connection.
  61          */
  62         NTSTATUS (*dispatch_incoming)(struct smbXcli_conn *conn,
  63                                       TALLOC_CTX *tmp_mem,
  64                                       uint8_t *inbuf);
  65
  66         struct {
  67                 struct {
  68                         uint32_t capabilities;
  69                         uint32_t max_xmit;
  70                 } client;
  71
  72                 struct {
  73                         uint32_t capabilities;
  74                         uint32_t max_xmit;
  75                         uint16_t max_mux;
  76                         uint16_t security_mode;
  77                         bool readbraw;
  78                         bool writebraw;
  79                         bool lockread;
  80                         bool writeunlock;
  81                         uint32_t session_key;
  82                         struct GUID guid;
  83                         DATA_BLOB gss_blob;
  84                         uint8_t challenge[8];
  85                         const char *workgroup;
  86                         const char *name;
  87                         int time_zone;
  88                         NTTIME system_time;
  89                 } server;
  90
  91                 uint32_t capabilities;
  92                 uint32_t max_xmit;
  93
  94                 uint16_t mid;
  95
  96                 struct smb_signing_state *signing;
  97                 struct smb_trans_enc_state *trans_enc;
  98         } smb1;
  99
 100         struct {
 101                 struct {
 102                         uint16_t security_mode;
 103                         struct GUID guid;
 104                 } client;
 105
 106                 struct {
 107                         uint32_t capabilities;
 108                         uint16_t security_mode;
 109                         struct GUID guid;
 110                         uint32_t max_trans_size;
 111                         uint32_t max_read_size;
 112                         uint32_t max_write_size;
 113                         NTTIME system_time;
 114                         NTTIME start_time;
 115                         DATA_BLOB gss_blob;
 116                 } server;
 117
 118                 uint64_t mid;
 119                 uint16_t cur_credits;
 120                 uint16_t max_credits;
 121         } smb2;
 122
 123         struct smbXcli_session *sessions;
 124 };
 125
 126 struct smbXcli_session {
 127         struct smbXcli_session *prev, *next;
 128         struct smbXcli_conn *conn;
 129
 130         struct {
 131                 uint64_t session_id;
 132                 uint16_t session_flags;
 133                 DATA_BLOB signing_key;
 134                 DATA_BLOB session_key;
 135                 bool should_sign;
 136         } smb2;
 137 };
 138
 139 struct smbXcli_req_state {
 140         struct tevent_context *ev;
 141         struct smbXcli_conn *conn;
 142         struct smbXcli_session *session; /* maybe NULL */
 143
 144         uint8_t length_hdr[4];
 145
 146         bool one_way;
 147
 148         uint8_t *inbuf;
 149
 150         struct {
 151                 /* Space for the header including the wct */
 152                 uint8_t hdr[HDR_VWV];
 153
 154                 /*
 155                  * For normal requests, smb1cli_req_send chooses a mid.
 156                  * SecondaryV trans requests need to use the mid of the primary
 157                  * request, so we need a place to store it.
 158                  * Assume it is set if != 0.
 159                  */
 160                 uint16_t mid;
 161
 162                 uint16_t *vwv;
 163                 uint8_t bytecount_buf[2];
 164
 165 #define MAX_SMB_IOV 5
 166                 /* length_hdr, hdr, words, byte_count, buffers */
 167                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 168                 int iov_count;
 169
 170                 uint32_t seqnum;
 171                 struct tevent_req **chained_requests;
 172
 173                 uint8_t recv_cmd;
 174                 NTSTATUS recv_status;
 175                 /* always an array of 3 talloc elements */
 176                 struct iovec *recv_iov;
 177         } smb1;
 178
 179         struct {
 180                 const uint8_t *fixed;
 181                 uint16_t fixed_len;
 182                 const uint8_t *dyn;
 183                 uint32_t dyn_len;
 184
 185                 uint8_t hdr[64];
 186                 uint8_t pad[7]; /* padding space for compounding */
 187
 188                 /* always an array of 3 talloc elements */
 189                 struct iovec *recv_iov;
 190
 191                 uint16_t credit_charge;
 192
 193                 bool signing_skipped;
 194         } smb2;
 195 };
 196
 197 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 198 {
 199         /*
 200          * NT_STATUS_OK, means we do not notify the callers
 201          */
 202         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 203
 204         while (conn->sessions) {
 205                 conn->sessions->conn = NULL;
 206                 DLIST_REMOVE(conn->sessions, conn->sessions);
 207         }
 208
 209         if (conn->smb1.trans_enc) {
 210                 common_free_encryption_state(&conn->smb1.trans_enc);
 211         }
 212
 213         return 0;
 214 }
 215
 216 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 217                                          int fd,
 218                                          const char *remote_name,
 219                                          enum smb_signing_setting signing_state,
 220                                          uint32_t smb1_capabilities,
 221                                          struct GUID *client_guid)
 222 {
 223         struct smbXcli_conn *conn = NULL;
 224         void *ss = NULL;
 225         struct sockaddr *sa = NULL;
 226         socklen_t sa_length;
 227         int ret;
 228
 229         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 230         if (!conn) {
 231                 return NULL;
 232         }
 233
 234         conn->remote_name = talloc_strdup(conn, remote_name);
 235         if (conn->remote_name == NULL) {
 236                 goto error;
 237         }
 238
 239         conn->fd = fd;
 240
 241         ss = (void *)&conn->local_ss;
 242         sa = (struct sockaddr *)ss;
 243         sa_length = sizeof(conn->local_ss);
 244         ret = getsockname(fd, sa, &sa_length);
 245         if (ret == -1) {
 246                 goto error;
 247         }
 248         ss = (void *)&conn->remote_ss;
 249         sa = (struct sockaddr *)ss;
 250         sa_length = sizeof(conn->remote_ss);
 251         ret = getpeername(fd, sa, &sa_length);
 252         if (ret == -1) {
 253                 goto error;
 254         }
 255
 256         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 257         if (conn->outgoing == NULL) {
 258                 goto error;
 259         }
 260         conn->pending = NULL;
 261
 262         conn->protocol = PROTOCOL_NONE;
 263
 264         switch (signing_state) {
 265         case SMB_SIGNING_OFF:
 266                 /* never */
 267                 conn->allow_signing = false;
 268                 conn->desire_signing = false;
 269                 conn->mandatory_signing = false;
 270                 break;
 271         case SMB_SIGNING_DEFAULT:
 272         case SMB_SIGNING_IF_REQUIRED:
 273                 /* if the server requires it */
 274                 conn->allow_signing = true;
 275                 conn->desire_signing = false;
 276                 conn->mandatory_signing = false;
 277                 break;
 278         case SMB_SIGNING_REQUIRED:
 279                 /* always */
 280                 conn->allow_signing = true;
 281                 conn->desire_signing = true;
 282                 conn->mandatory_signing = true;
 283                 break;
 284         }
 285
 286         conn->smb1.client.capabilities = smb1_capabilities;
 287         conn->smb1.client.max_xmit = UINT16_MAX;
 288
 289         conn->smb1.capabilities = conn->smb1.client.capabilities;
 290         conn->smb1.max_xmit = 1024;
 291
 292         conn->smb1.mid = 1;
 293
 294         /* initialise signing */
 295         conn->smb1.signing = smb_signing_init(conn,
 296                                               conn->allow_signing,
 297                                               conn->desire_signing,
 298                                               conn->mandatory_signing);
 299         if (!conn->smb1.signing) {
 300                 goto error;
 301         }
 302
 303         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 304         if (conn->mandatory_signing) {
 305                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 306         }
 307         if (client_guid) {
 308                 conn->smb2.client.guid = *client_guid;
 309         }
 310
 311         conn->smb2.cur_credits = 1;
 312         conn->smb2.max_credits = 0;
 313
 314         talloc_set_destructor(conn, smbXcli_conn_destructor);
 315         return conn;
 316
 317  error:
 318         TALLOC_FREE(conn);
 319         return NULL;
 320 }
 321
 322 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 323 {
 324         if (conn == NULL) {
 325                 return false;
 326         }
 327
 328         if (conn->fd == -1) {
 329                 return false;
 330         }
 331
 332         return true;
 333 }
 334
 335 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 336 {
 337         return conn->protocol;
 338 }
 339
 340 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 341 {
 342         if (conn->protocol >= PROTOCOL_SMB2_02) {
 343                 return true;
 344         }
 345
 346         if (conn->smb1.capabilities & CAP_UNICODE) {
 347                 return true;
 348         }
 349
 350         return false;
 351 }
 352
 353 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 354 {
 355         set_socket_options(conn->fd, options);
 356 }
 357
 358 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 359 {
 360         return &conn->local_ss;
 361 }
 362
 363 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 364 {
 365         return &conn->remote_ss;
 366 }
 367
 368 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 369 {
 370         return conn->remote_name;
 371 }
 372
 373 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 374 {
 375         if (conn->protocol >= PROTOCOL_SMB2_02) {
 376                 /*
 377                  * TODO...
 378                  */
 379                 return 1;
 380         }
 381
 382         return conn->smb1.server.max_mux;
 383 }
 384
 385 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 386 {
 387         if (conn->protocol >= PROTOCOL_SMB2_02) {
 388                 return conn->smb2.server.system_time;
 389         }
 390
 391         return conn->smb1.server.system_time;
 392 }
 393
 394 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 395 {
 396         if (conn->protocol >= PROTOCOL_SMB2_02) {
 397                 return &conn->smb2.server.gss_blob;
 398         }
 399
 400         return &conn->smb1.server.gss_blob;
 401 }
 402
 403 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 404 {
 405         if (conn->protocol >= PROTOCOL_SMB2_02) {
 406                 return &conn->smb2.server.guid;
 407         }
 408
 409         return &conn->smb1.server.guid;
 410 }
 411
 412 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 413 {
 414         return conn->smb1.capabilities;
 415 }
 416
 417 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 418 {
 419         return conn->smb1.max_xmit;
 420 }
 421
 422 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 423 {
 424         return conn->smb1.server.session_key;
 425 }
 426
 427 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 428 {
 429         return conn->smb1.server.challenge;
 430 }
 431
 432 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 433 {
 434         return conn->smb1.server.security_mode;
 435 }
 436
 437 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 438 {
 439         return conn->smb1.server.time_zone;
 440 }
 441
 442 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 443                                    const DATA_BLOB user_session_key,
 444                                    const DATA_BLOB response)
 445 {
 446         return smb_signing_activate(conn->smb1.signing,
 447                                     user_session_key,
 448                                     response);
 449 }
 450
 451 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 452                                 const uint8_t *buf, uint32_t seqnum)
 453 {
 454         return smb_signing_check_pdu(conn->smb1.signing, buf, seqnum);
 455 }
 456
 457 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 458 {
 459         return smb_signing_is_active(conn->smb1.signing);
 460 }
 461
 462 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 463                                  struct smb_trans_enc_state *es)
 464 {
 465         /* Replace the old state, if any. */
 466         if (conn->smb1.trans_enc) {
 467                 common_free_encryption_state(&conn->smb1.trans_enc);
 468         }
 469         conn->smb1.trans_enc = es;
 470 }
 471
 472 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 473 {
 474         return common_encryption_on(conn->smb1.trans_enc);
 475 }
 476
 477
 478 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 479 {
 480         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 481         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 482
 483         if (NT_STATUS_IS_OK(status)) {
 484                 return NT_STATUS_OK;
 485         }
 486
 487         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 488                 return status;
 489         }
 490
 491         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 492 }
 493
 494 /**
 495  * Is the SMB command able to hold an AND_X successor
 496  * @param[in] cmd       The SMB command in question
 497  * @retval Can we add a chained request after "cmd"?
 498  */
 499 bool smb1cli_is_andx_req(uint8_t cmd)
 500 {
 501         switch (cmd) {
 502         case SMBtconX:
 503         case SMBlockingX:
 504         case SMBopenX:
 505         case SMBreadX:
 506         case SMBwriteX:
 507         case SMBsesssetupX:
 508         case SMBulogoffX:
 509         case SMBntcreateX:
 510                 return true;
 511                 break;
 512         default:
 513                 break;
 514         }
 515
 516         return false;
 517 }
 518
 519 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 520 {
 521         size_t num_pending = talloc_array_length(conn->pending);
 522         uint16_t result;
 523
 524         while (true) {
 525                 size_t i;
 526
 527                 result = conn->smb1.mid++;
 528                 if ((result == 0) || (result == 0xffff)) {
 529                         continue;
 530                 }
 531
 532                 for (i=0; i<num_pending; i++) {
 533                         if (result == smb1cli_req_mid(conn->pending[i])) {
 534                                 break;
 535                         }
 536                 }
 537
 538                 if (i == num_pending) {
 539                         return result;
 540                 }
 541         }
 542 }
 543
 544 void smbXcli_req_unset_pending(struct tevent_req *req)
 545 {
 546         struct smbXcli_req_state *state =
 547                 tevent_req_data(req,
 548                 struct smbXcli_req_state);
 549         struct smbXcli_conn *conn = state->conn;
 550         size_t num_pending = talloc_array_length(conn->pending);
 551         size_t i;
 552
 553         if (state->smb1.mid != 0) {
 554                 /*
 555                  * This is a [nt]trans[2] request which waits
 556                  * for more than one reply.
 557                  */
 558                 return;
 559         }
 560
 561         talloc_set_destructor(req, NULL);
 562
 563         if (num_pending == 1) {
 564                 /*
 565                  * The pending read_smb tevent_req is a child of
 566                  * conn->pending. So if nothing is pending anymore, we need to
 567                  * delete the socket read fde.
 568                  */
 569                 TALLOC_FREE(conn->pending);
 570                 conn->read_smb_req = NULL;
 571                 return;
 572         }
 573
 574         for (i=0; i<num_pending; i++) {
 575                 if (req == conn->pending[i]) {
 576                         break;
 577                 }
 578         }
 579         if (i == num_pending) {
 580                 /*
 581                  * Something's seriously broken. Just returning here is the
 582                  * right thing nevertheless, the point of this routine is to
 583                  * remove ourselves from conn->pending.
 584                  */
 585                 return;
 586         }
 587
 588         /*
 589          * Remove ourselves from the conn->pending array
 590          */
 591         for (; i < (num_pending - 1); i++) {
 592                 conn->pending[i] = conn->pending[i+1];
 593         }
 594
 595         /*
 596          * No NULL check here, we're shrinking by sizeof(void *), and
 597          * talloc_realloc just adjusts the size for this.
 598          */
 599         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 600                                        num_pending - 1);
 601         return;
 602 }
 603
 604 static int smbXcli_req_destructor(struct tevent_req *req)
 605 {
 606         struct smbXcli_req_state *state =
 607                 tevent_req_data(req,
 608                 struct smbXcli_req_state);
 609
 610         /*
 611          * Make sure we really remove it from
 612          * the pending array on destruction.
 613          */
 614         state->smb1.mid = 0;
 615         smbXcli_req_unset_pending(req);
 616         return 0;
 617 }
 618
 619 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 620
 621 bool smbXcli_req_set_pending(struct tevent_req *req)
 622 {
 623         struct smbXcli_req_state *state =
 624                 tevent_req_data(req,
 625                 struct smbXcli_req_state);
 626         struct smbXcli_conn *conn;
 627         struct tevent_req **pending;
 628         size_t num_pending;
 629
 630         conn = state->conn;
 631
 632         if (!smbXcli_conn_is_connected(conn)) {
 633                 return false;
 634         }
 635
 636         num_pending = talloc_array_length(conn->pending);
 637
 638         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 639                                  num_pending+1);
 640         if (pending == NULL) {
 641                 return false;
 642         }
 643         pending[num_pending] = req;
 644         conn->pending = pending;
 645         talloc_set_destructor(req, smbXcli_req_destructor);
 646
 647         if (!smbXcli_conn_receive_next(conn)) {
 648                 /*
 649                  * the caller should notify the current request
 650                  *
 651                  * And all other pending requests get notified
 652                  * by smbXcli_conn_disconnect().
 653                  */
 654                 smbXcli_req_unset_pending(req);
 655                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 656                 return false;
 657         }
 658
 659         return true;
 660 }
 661
 662 static void smbXcli_conn_received(struct tevent_req *subreq);
 663
 664 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 665 {
 666         size_t num_pending = talloc_array_length(conn->pending);
 667         struct tevent_req *req;
 668         struct smbXcli_req_state *state;
 669
 670         if (conn->read_smb_req != NULL) {
 671                 return true;
 672         }
 673
 674         if (num_pending == 0) {
 675                 if (conn->smb2.mid < UINT64_MAX) {
 676                         /* no more pending requests, so we are done for now */
 677                         return true;
 678                 }
 679
 680                 /*
 681                  * If there are no more SMB2 requests possible,
 682                  * because we are out of message ids,
 683                  * we need to disconnect.
 684                  */
 685                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
 686                 return true;
 687         }
 688
 689         req = conn->pending[0];
 690         state = tevent_req_data(req, struct smbXcli_req_state);
 691
 692         /*
 693          * We're the first ones, add the read_smb request that waits for the
 694          * answer from the server
 695          */
 696         conn->read_smb_req = read_smb_send(conn->pending, state->ev, conn->fd);
 697         if (conn->read_smb_req == NULL) {
 698                 return false;
 699         }
 700         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
 701         return true;
 702 }
 703
 704 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
 705 {
 706         if (conn->fd != -1) {
 707                 close(conn->fd);
 708         }
 709         conn->fd = -1;
 710
 711         /*
 712          * Cancel all pending requests. We do not do a for-loop walking
 713          * conn->pending because that array changes in
 714          * smbXcli_req_unset_pending.
 715          */
 716         while (talloc_array_length(conn->pending) > 0) {
 717                 struct tevent_req *req;
 718                 struct smbXcli_req_state *state;
 719                 struct tevent_req **chain;
 720                 size_t num_chained;
 721                 size_t i;
 722
 723                 req = conn->pending[0];
 724                 state = tevent_req_data(req, struct smbXcli_req_state);
 725
 726                 if (state->smb1.chained_requests == NULL) {
 727                         /*
 728                          * We're dead. No point waiting for trans2
 729                          * replies.
 730                          */
 731                         state->smb1.mid = 0;
 732
 733                         smbXcli_req_unset_pending(req);
 734
 735                         if (NT_STATUS_IS_OK(status)) {
 736                                 /* do not notify the callers */
 737                                 continue;
 738                         }
 739
 740                         /*
 741                          * we need to defer the callback, because we may notify
 742                          * more then one caller.
 743                          */
 744                         tevent_req_defer_callback(req, state->ev);
 745                         tevent_req_nterror(req, status);
 746                         continue;
 747                 }
 748
 749                 chain = talloc_move(conn, &state->smb1.chained_requests);
 750                 num_chained = talloc_array_length(chain);
 751
 752                 for (i=0; i<num_chained; i++) {
 753                         req = chain[i];
 754                         state = tevent_req_data(req, struct smbXcli_req_state);
 755
 756                         /*
 757                          * We're dead. No point waiting for trans2
 758                          * replies.
 759                          */
 760                         state->smb1.mid = 0;
 761
 762                         smbXcli_req_unset_pending(req);
 763
 764                         if (NT_STATUS_IS_OK(status)) {
 765                                 /* do not notify the callers */
 766                                 continue;
 767                         }
 768
 769                         /*
 770                          * we need to defer the callback, because we may notify
 771                          * more then one caller.
 772                          */
 773                         tevent_req_defer_callback(req, state->ev);
 774                         tevent_req_nterror(req, status);
 775                 }
 776                 TALLOC_FREE(chain);
 777         }
 778 }
 779
 780 /*
 781  * Fetch a smb request's mid. Only valid after the request has been sent by
 782  * smb1cli_req_send().
 783  */
 784 uint16_t smb1cli_req_mid(struct tevent_req *req)
 785 {
 786         struct smbXcli_req_state *state =
 787                 tevent_req_data(req,
 788                 struct smbXcli_req_state);
 789
 790         if (state->smb1.mid != 0) {
 791                 return state->smb1.mid;
 792         }
 793
 794         return SVAL(state->smb1.hdr, HDR_MID);
 795 }
 796
 797 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
 798 {
 799         struct smbXcli_req_state *state =
 800                 tevent_req_data(req,
 801                 struct smbXcli_req_state);
 802
 803         state->smb1.mid = mid;
 804 }
 805
 806 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
 807 {
 808         struct smbXcli_req_state *state =
 809                 tevent_req_data(req,
 810                 struct smbXcli_req_state);
 811
 812         return state->smb1.seqnum;
 813 }
 814
 815 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
 816 {
 817         struct smbXcli_req_state *state =
 818                 tevent_req_data(req,
 819                 struct smbXcli_req_state);
 820
 821         state->smb1.seqnum = seqnum;
 822 }
 823
 824 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
 825 {
 826         size_t result = 0;
 827         int i;
 828         for (i=0; i<count; i++) {
 829                 result += iov[i].iov_len;
 830         }
 831         return result;
 832 }
 833
 834 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
 835                                    const struct iovec *iov,
 836                                    int count)
 837 {
 838         size_t len = smbXcli_iov_len(iov, count);
 839         size_t copied;
 840         uint8_t *buf;
 841         int i;
 842
 843         buf = talloc_array(mem_ctx, uint8_t, len);
 844         if (buf == NULL) {
 845                 return NULL;
 846         }
 847         copied = 0;
 848         for (i=0; i<count; i++) {
 849                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
 850                 copied += iov[i].iov_len;
 851         }
 852         return buf;
 853 }
 854
 855 static void smb1cli_req_flags(enum protocol_types protocol,
 856                               uint32_t smb1_capabilities,
 857                               uint8_t smb_command,
 858                               uint8_t additional_flags,
 859                               uint8_t clear_flags,
 860                               uint8_t *_flags,
 861                               uint16_t additional_flags2,
 862                               uint16_t clear_flags2,
 863                               uint16_t *_flags2)
 864 {
 865         uint8_t flags = 0;
 866         uint16_t flags2 = 0;
 867
 868         if (protocol >= PROTOCOL_LANMAN1) {
 869                 flags |= FLAG_CASELESS_PATHNAMES;
 870                 flags |= FLAG_CANONICAL_PATHNAMES;
 871         }
 872
 873         if (protocol >= PROTOCOL_LANMAN2) {
 874                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
 875                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
 876         }
 877
 878         if (protocol >= PROTOCOL_NT1) {
 879                 flags2 |= FLAGS2_IS_LONG_NAME;
 880
 881                 if (smb1_capabilities & CAP_UNICODE) {
 882                         flags2 |= FLAGS2_UNICODE_STRINGS;
 883                 }
 884                 if (smb1_capabilities & CAP_STATUS32) {
 885                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 886                 }
 887                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
 888                         flags2 |= FLAGS2_EXTENDED_SECURITY;
 889                 }
 890         }
 891
 892         flags |= additional_flags;
 893         flags &= ~clear_flags;
 894         flags2 |= additional_flags2;
 895         flags2 &= ~clear_flags2;
 896
 897         *_flags = flags;
 898         *_flags2 = flags2;
 899 }
 900
 901 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
 902                                       struct tevent_context *ev,
 903                                       struct smbXcli_conn *conn,
 904                                       uint8_t smb_command,
 905                                       uint8_t additional_flags,
 906                                       uint8_t clear_flags,
 907                                       uint16_t additional_flags2,
 908                                       uint16_t clear_flags2,
 909                                       uint32_t timeout_msec,
 910                                       uint32_t pid,
 911                                       uint16_t tid,
 912                                       uint16_t uid,
 913                                       uint8_t wct, uint16_t *vwv,
 914                                       int iov_count,
 915                                       struct iovec *bytes_iov)
 916 {
 917         struct tevent_req *req;
 918         struct smbXcli_req_state *state;
 919         uint8_t flags = 0;
 920         uint16_t flags2 = 0;
 921
 922         if (iov_count > MAX_SMB_IOV) {
 923                 /*
 924                  * Should not happen :-)
 925                  */
 926                 return NULL;
 927         }
 928
 929         req = tevent_req_create(mem_ctx, &state,
 930                                 struct smbXcli_req_state);
 931         if (req == NULL) {
 932                 return NULL;
 933         }
 934         state->ev = ev;
 935         state->conn = conn;
 936
 937         state->smb1.recv_cmd = 0xFF;
 938         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
 939         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
 940         if (state->smb1.recv_iov == NULL) {
 941                 TALLOC_FREE(req);
 942                 return NULL;
 943         }
 944
 945         smb1cli_req_flags(conn->protocol,
 946                           conn->smb1.capabilities,
 947                           smb_command,
 948                           additional_flags,
 949                           clear_flags,
 950                           &flags,
 951                           additional_flags2,
 952                           clear_flags2,
 953                           &flags2);
 954
 955         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
 956         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
 957         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
 958         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
 959         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
 960         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
 961         SSVAL(state->smb1.hdr, HDR_TID,     tid);
 962         SSVAL(state->smb1.hdr, HDR_PID,     pid);
 963         SSVAL(state->smb1.hdr, HDR_UID,     uid);
 964         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
 965         SSVAL(state->smb1.hdr, HDR_WCT,     wct);
 966
 967         state->smb1.vwv = vwv;
 968
 969         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
 970
 971         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
 972         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
 973         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
 974         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
 975         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
 976         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
 977         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
 978         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
 979
 980         if (iov_count != 0) {
 981                 memcpy(&state->smb1.iov[4], bytes_iov,
 982                        iov_count * sizeof(*bytes_iov));
 983         }
 984         state->smb1.iov_count = iov_count + 4;
 985
 986         if (timeout_msec > 0) {
 987                 struct timeval endtime;
 988
 989                 endtime = timeval_current_ofs_msec(timeout_msec);
 990                 if (!tevent_req_set_endtime(req, ev, endtime)) {
 991                         return req;
 992                 }
 993         }
 994
 995         switch (smb_command) {
 996         case SMBtranss:
 997         case SMBtranss2:
 998         case SMBnttranss:
 999         case SMBntcancel:
1000                 state->one_way = true;
1001                 break;
1002         case SMBlockingX:
1003                 if ((wct == 8) &&
1004                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1005                         state->one_way = true;
1006                 }
1007                 break;
1008         }
1009
1010         return req;
1011 }
1012
1013 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1014                                    struct iovec *iov, int iov_count,
1015                                    uint32_t *seqnum)
1016 {
1017         uint8_t *buf;
1018
1019         /*
1020          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1021          * iovec directly. MD5Update would do that just fine.
1022          */
1023
1024         if (iov_count < 4) {
1025                 return NT_STATUS_INVALID_PARAMETER_MIX;
1026         }
1027         if (iov[0].iov_len != NBT_HDR_SIZE) {
1028                 return NT_STATUS_INVALID_PARAMETER_MIX;
1029         }
1030         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1031                 return NT_STATUS_INVALID_PARAMETER_MIX;
1032         }
1033         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1034                 return NT_STATUS_INVALID_PARAMETER_MIX;
1035         }
1036         if (iov[3].iov_len != sizeof(uint16_t)) {
1037                 return NT_STATUS_INVALID_PARAMETER_MIX;
1038         }
1039
1040         buf = smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1041         if (buf == NULL) {
1042                 return NT_STATUS_NO_MEMORY;
1043         }
1044
1045         *seqnum = smb_signing_next_seqnum(conn->smb1.signing, false);
1046         smb_signing_sign_pdu(conn->smb1.signing, buf, *seqnum);
1047         memcpy(iov[1].iov_base, buf+4, iov[1].iov_len);
1048
1049         TALLOC_FREE(buf);
1050         return NT_STATUS_OK;
1051 }
1052
1053 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1054 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1055                                                TALLOC_CTX *tmp_mem,
1056                                                uint8_t *inbuf);
1057
1058 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1059                                           struct smbXcli_req_state *state,
1060                                           struct iovec *iov, int iov_count)
1061 {
1062         struct tevent_req *subreq;
1063         NTSTATUS status;
1064         uint16_t mid;
1065
1066         if (!smbXcli_conn_is_connected(state->conn)) {
1067                 return NT_STATUS_CONNECTION_DISCONNECTED;
1068         }
1069
1070         if (state->conn->protocol > PROTOCOL_NT1) {
1071                 return NT_STATUS_REVISION_MISMATCH;
1072         }
1073
1074         if (iov_count < 4) {
1075                 return NT_STATUS_INVALID_PARAMETER_MIX;
1076         }
1077         if (iov[0].iov_len != NBT_HDR_SIZE) {
1078                 return NT_STATUS_INVALID_PARAMETER_MIX;
1079         }
1080         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1081                 return NT_STATUS_INVALID_PARAMETER_MIX;
1082         }
1083         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1084                 return NT_STATUS_INVALID_PARAMETER_MIX;
1085         }
1086         if (iov[3].iov_len != sizeof(uint16_t)) {
1087                 return NT_STATUS_INVALID_PARAMETER_MIX;
1088         }
1089
1090         if (state->smb1.mid != 0) {
1091                 mid = state->smb1.mid;
1092         } else {
1093                 mid = smb1cli_alloc_mid(state->conn);
1094         }
1095         SSVAL(iov[1].iov_base, HDR_MID, mid);
1096
1097         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1098
1099         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1100                                     &state->smb1.seqnum);
1101
1102         if (!NT_STATUS_IS_OK(status)) {
1103                 return status;
1104         }
1105
1106         /*
1107          * If we supported multiple encrytion contexts
1108          * here we'd look up based on tid.
1109          */
1110         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1111                 char *buf, *enc_buf;
1112
1113                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1114                 if (buf == NULL) {
1115                         return NT_STATUS_NO_MEMORY;
1116                 }
1117                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1118                                                (char *)buf, &enc_buf);
1119                 TALLOC_FREE(buf);
1120                 if (!NT_STATUS_IS_OK(status)) {
1121                         DEBUG(0, ("Error in encrypting client message: %s\n",
1122                                   nt_errstr(status)));
1123                         return status;
1124                 }
1125                 buf = (char *)talloc_memdup(state, enc_buf,
1126                                             smb_len_nbt(enc_buf)+4);
1127                 SAFE_FREE(enc_buf);
1128                 if (buf == NULL) {
1129                         return NT_STATUS_NO_MEMORY;
1130                 }
1131                 iov[0].iov_base = (void *)buf;
1132                 iov[0].iov_len = talloc_get_size(buf);
1133                 iov_count = 1;
1134         }
1135
1136         if (state->conn->dispatch_incoming == NULL) {
1137                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1138         }
1139
1140         subreq = writev_send(state, state->ev, state->conn->outgoing,
1141                              state->conn->fd, false, iov, iov_count);
1142         if (subreq == NULL) {
1143                 return NT_STATUS_NO_MEMORY;
1144         }
1145         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1146         return NT_STATUS_OK;
1147 }
1148
1149 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1150                                     struct tevent_context *ev,
1151                                     struct smbXcli_conn *conn,
1152                                     uint8_t smb_command,
1153                                     uint8_t additional_flags,
1154                                     uint8_t clear_flags,
1155                                     uint16_t additional_flags2,
1156                                     uint16_t clear_flags2,
1157                                     uint32_t timeout_msec,
1158                                     uint32_t pid,
1159                                     uint16_t tid,
1160                                     uint16_t uid,
1161                                     uint8_t wct, uint16_t *vwv,
1162                                     uint32_t num_bytes,
1163                                     const uint8_t *bytes)
1164 {
1165         struct tevent_req *req;
1166         struct iovec iov;
1167         NTSTATUS status;
1168
1169         iov.iov_base = discard_const_p(void, bytes);
1170         iov.iov_len = num_bytes;
1171
1172         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1173                                  additional_flags, clear_flags,
1174                                  additional_flags2, clear_flags2,
1175                                  timeout_msec,
1176                                  pid, tid, uid,
1177                                  wct, vwv, 1, &iov);
1178         if (req == NULL) {
1179                 return NULL;
1180         }
1181         if (!tevent_req_is_in_progress(req)) {
1182                 return tevent_req_post(req, ev);
1183         }
1184         status = smb1cli_req_chain_submit(&req, 1);
1185         if (tevent_req_nterror(req, status)) {
1186                 return tevent_req_post(req, ev);
1187         }
1188         return req;
1189 }
1190
1191 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1192 {
1193         struct tevent_req *req =
1194                 tevent_req_callback_data(subreq,
1195                 struct tevent_req);
1196         struct smbXcli_req_state *state =
1197                 tevent_req_data(req,
1198                 struct smbXcli_req_state);
1199         ssize_t nwritten;
1200         int err;
1201
1202         nwritten = writev_recv(subreq, &err);
1203         TALLOC_FREE(subreq);
1204         if (nwritten == -1) {
1205                 NTSTATUS status = map_nt_error_from_unix_common(err);
1206                 smbXcli_conn_disconnect(state->conn, status);
1207                 return;
1208         }
1209
1210         if (state->one_way) {
1211                 state->inbuf = NULL;
1212                 tevent_req_done(req);
1213                 return;
1214         }
1215
1216         if (!smbXcli_req_set_pending(req)) {
1217                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1218                 return;
1219         }
1220 }
1221
1222 static void smbXcli_conn_received(struct tevent_req *subreq)
1223 {
1224         struct smbXcli_conn *conn =
1225                 tevent_req_callback_data(subreq,
1226                 struct smbXcli_conn);
1227         TALLOC_CTX *frame = talloc_stackframe();
1228         NTSTATUS status;
1229         uint8_t *inbuf;
1230         ssize_t received;
1231         int err;
1232
1233         if (subreq != conn->read_smb_req) {
1234                 DEBUG(1, ("Internal error: cli_smb_received called with "
1235                           "unexpected subreq\n"));
1236                 status = NT_STATUS_INTERNAL_ERROR;
1237                 smbXcli_conn_disconnect(conn, status);
1238                 TALLOC_FREE(frame);
1239                 return;
1240         }
1241         conn->read_smb_req = NULL;
1242
1243         received = read_smb_recv(subreq, frame, &inbuf, &err);
1244         TALLOC_FREE(subreq);
1245         if (received == -1) {
1246                 status = map_nt_error_from_unix_common(err);
1247                 smbXcli_conn_disconnect(conn, status);
1248                 TALLOC_FREE(frame);
1249                 return;
1250         }
1251
1252         status = conn->dispatch_incoming(conn, frame, inbuf);
1253         TALLOC_FREE(frame);
1254         if (NT_STATUS_IS_OK(status)) {
1255                 /*
1256                  * We should not do any more processing
1257                  * as the dispatch function called
1258                  * tevent_req_done().
1259                  */
1260                 return;
1261         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1262                 /*
1263                  * We got an error, so notify all pending requests
1264                  */
1265                 smbXcli_conn_disconnect(conn, status);
1266                 return;
1267         }
1268
1269         /*
1270          * We got NT_STATUS_RETRY, so we may ask for a
1271          * next incoming pdu.
1272          */
1273         if (!smbXcli_conn_receive_next(conn)) {
1274                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1275         }
1276 }
1277
1278 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1279                                           struct iovec **piov, int *pnum_iov)
1280 {
1281         struct iovec *iov;
1282         int num_iov;
1283         size_t buflen;
1284         size_t taken;
1285         size_t remaining;
1286         uint8_t *hdr;
1287         uint8_t cmd;
1288         uint32_t wct_ofs;
1289
1290         buflen = smb_len_nbt(buf);
1291         taken = 0;
1292
1293         hdr = buf + NBT_HDR_SIZE;
1294
1295         if (buflen < MIN_SMB_SIZE) {
1296                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1297         }
1298
1299         /*
1300          * This returns iovec elements in the following order:
1301          *
1302          * - SMB header
1303          *
1304          * - Parameter Block
1305          * - Data Block
1306          *
1307          * - Parameter Block
1308          * - Data Block
1309          *
1310          * - Parameter Block
1311          * - Data Block
1312          */
1313         num_iov = 1;
1314
1315         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1316         if (iov == NULL) {
1317                 return NT_STATUS_NO_MEMORY;
1318         }
1319         iov[0].iov_base = hdr;
1320         iov[0].iov_len = HDR_WCT;
1321         taken += HDR_WCT;
1322
1323         cmd = CVAL(hdr, HDR_COM);
1324         wct_ofs = HDR_WCT;
1325
1326         while (true) {
1327                 size_t len = buflen - taken;
1328                 struct iovec *cur;
1329                 struct iovec *iov_tmp;
1330                 uint8_t wct;
1331                 uint32_t bcc_ofs;
1332                 uint16_t bcc;
1333                 size_t needed;
1334
1335                 /*
1336                  * we need at least WCT and BCC
1337                  */
1338                 needed = sizeof(uint8_t) + sizeof(uint16_t);
1339                 if (len < needed) {
1340                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1341                                    __location__, (int)len, (int)needed));
1342                         goto inval;
1343                 }
1344
1345                 /*
1346                  * Now we check if the specified words are there
1347                  */
1348                 wct = CVAL(hdr, wct_ofs);
1349                 needed += wct * sizeof(uint16_t);
1350                 if (len < needed) {
1351                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1352                                    __location__, (int)len, (int)needed));
1353                         goto inval;
1354                 }
1355
1356                 /*
1357                  * Now we check if the specified bytes are there
1358                  */
1359                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1360                 bcc = SVAL(hdr, bcc_ofs);
1361                 needed += bcc * sizeof(uint8_t);
1362                 if (len < needed) {
1363                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1364                                    __location__, (int)len, (int)needed));
1365                         goto inval;
1366                 }
1367
1368                 /*
1369                  * we allocate 2 iovec structures for words and bytes
1370                  */
1371                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1372                                          num_iov + 2);
1373                 if (iov_tmp == NULL) {
1374                         TALLOC_FREE(iov);
1375                         return NT_STATUS_NO_MEMORY;
1376                 }
1377                 iov = iov_tmp;
1378                 cur = &iov[num_iov];
1379                 num_iov += 2;
1380
1381                 cur[0].iov_len = wct * sizeof(uint16_t);
1382                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1383                 cur[1].iov_len = bcc * sizeof(uint8_t);
1384                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1385
1386                 taken += needed;
1387
1388                 if (!smb1cli_is_andx_req(cmd)) {
1389                         /*
1390                          * If the current command does not have AndX chanining
1391                          * we are done.
1392                          */
1393                         break;
1394                 }
1395
1396                 if (wct == 0 && bcc == 0) {
1397                         /*
1398                          * An empty response also ends the chain,
1399                          * most likely with an error.
1400                          */
1401                         break;
1402                 }
1403
1404                 if (wct < 2) {
1405                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1406                                    __location__, (int)wct, (int)cmd));
1407                         goto inval;
1408                 }
1409                 cmd = CVAL(cur[0].iov_base, 0);
1410                 if (cmd == 0xFF) {
1411                         /*
1412                          * If it is the end of the chain we are also done.
1413                          */
1414                         break;
1415                 }
1416                 wct_ofs = SVAL(cur[0].iov_base, 2);
1417
1418                 if (wct_ofs < taken) {
1419                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1420                 }
1421                 if (wct_ofs > buflen) {
1422                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1423                 }
1424
1425                 /*
1426                  * we consumed everything up to the start of the next
1427                  * parameter block.
1428                  */
1429                 taken = wct_ofs;
1430         }
1431
1432         remaining = buflen - taken;
1433
1434         if (remaining > 0 && num_iov >= 3) {
1435                 /*
1436                  * The last DATA block gets the remaining
1437                  * bytes, this is needed to support
1438                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1439                  */
1440                 iov[num_iov-1].iov_len += remaining;
1441         }
1442
1443         *piov = iov;
1444         *pnum_iov = num_iov;
1445         return NT_STATUS_OK;
1446
1447 inval:
1448         TALLOC_FREE(iov);
1449         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1450 }
1451
1452 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1453                                                TALLOC_CTX *tmp_mem,
1454                                                uint8_t *inbuf)
1455 {
1456         struct tevent_req *req;
1457         struct smbXcli_req_state *state;
1458         NTSTATUS status;
1459         size_t num_pending;
1460         size_t i;
1461         uint8_t cmd;
1462         uint16_t mid;
1463         bool oplock_break;
1464         const uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1465         struct iovec *iov = NULL;
1466         int num_iov = 0;
1467         struct tevent_req **chain = NULL;
1468         size_t num_chained = 0;
1469         size_t num_responses = 0;
1470
1471         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1472             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1473                 DEBUG(10, ("Got non-SMB PDU\n"));
1474                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1475         }
1476
1477         /*
1478          * If we supported multiple encrytion contexts
1479          * here we'd look up based on tid.
1480          */
1481         if (common_encryption_on(conn->smb1.trans_enc)
1482             && (CVAL(inbuf, 0) == 0)) {
1483                 uint16_t enc_ctx_num;
1484
1485                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1486                 if (!NT_STATUS_IS_OK(status)) {
1487                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1488                                    nt_errstr(status)));
1489                         return status;
1490                 }
1491
1492                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1493                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1494                                    enc_ctx_num,
1495                                    conn->smb1.trans_enc->enc_ctx_num));
1496                         return NT_STATUS_INVALID_HANDLE;
1497                 }
1498
1499                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1500                                                (char *)inbuf);
1501                 if (!NT_STATUS_IS_OK(status)) {
1502                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1503                                    nt_errstr(status)));
1504                         return status;
1505                 }
1506         }
1507
1508         mid = SVAL(inhdr, HDR_MID);
1509         num_pending = talloc_array_length(conn->pending);
1510
1511         for (i=0; i<num_pending; i++) {
1512                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1513                         break;
1514                 }
1515         }
1516         if (i == num_pending) {
1517                 /* Dump unexpected reply */
1518                 return NT_STATUS_RETRY;
1519         }
1520
1521         oplock_break = false;
1522
1523         if (mid == 0xffff) {
1524                 /*
1525                  * Paranoia checks that this is really an oplock break request.
1526                  */
1527                 oplock_break = (smb_len_nbt(inbuf) == 51); /* hdr + 8 words */
1528                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1529                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1530                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1531                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1532
1533                 if (!oplock_break) {
1534                         /* Dump unexpected reply */
1535                         return NT_STATUS_RETRY;
1536                 }
1537         }
1538
1539         req = conn->pending[i];
1540         state = tevent_req_data(req, struct smbXcli_req_state);
1541
1542         if (!oplock_break /* oplock breaks are not signed */
1543             && !smb_signing_check_pdu(conn->smb1.signing,
1544                                       inbuf, state->smb1.seqnum+1)) {
1545                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1546                 return NT_STATUS_ACCESS_DENIED;
1547         }
1548
1549         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
1550                                            &iov, &num_iov);
1551         if (!NT_STATUS_IS_OK(status)) {
1552                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
1553                           nt_errstr(status)));
1554                 return status;
1555         }
1556
1557         cmd = CVAL(inhdr, HDR_COM);
1558         status = smb1cli_pull_raw_error(inhdr);
1559
1560         if (state->smb1.chained_requests == NULL) {
1561                 if (num_iov != 3) {
1562                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1563                 }
1564
1565                 smbXcli_req_unset_pending(req);
1566
1567                 state->smb1.recv_cmd = cmd;
1568                 state->smb1.recv_status = status;
1569                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1570
1571                 state->smb1.recv_iov[0] = iov[0];
1572                 state->smb1.recv_iov[1] = iov[1];
1573                 state->smb1.recv_iov[2] = iov[2];
1574
1575                 if (talloc_array_length(conn->pending) == 0) {
1576                         tevent_req_done(req);
1577                         return NT_STATUS_OK;
1578                 }
1579
1580                 tevent_req_defer_callback(req, state->ev);
1581                 tevent_req_done(req);
1582                 return NT_STATUS_RETRY;
1583         }
1584
1585         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
1586         num_chained = talloc_array_length(chain);
1587         num_responses = (num_iov - 1)/2;
1588
1589         if (num_responses > num_chained) {
1590                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1591         }
1592
1593         for (i=0; i<num_chained; i++) {
1594                 size_t iov_idx = 1 + (i*2);
1595                 struct iovec *cur = &iov[iov_idx];
1596                 uint8_t *inbuf_ref;
1597
1598                 req = chain[i];
1599                 state = tevent_req_data(req, struct smbXcli_req_state);
1600
1601                 smbXcli_req_unset_pending(req);
1602
1603                 /*
1604                  * as we finish multiple requests here
1605                  * we need to defer the callbacks as
1606                  * they could destroy our current stack state.
1607                  */
1608                 tevent_req_defer_callback(req, state->ev);
1609
1610                 if (i >= num_responses) {
1611                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
1612                         continue;
1613                 }
1614
1615                 state->smb1.recv_cmd = cmd;
1616
1617                 if (i == (num_responses - 1)) {
1618                         /*
1619                          * The last request in the chain gets the status
1620                          */
1621                         state->smb1.recv_status = status;
1622                 } else {
1623                         cmd = CVAL(cur[0].iov_base, 0);
1624                         state->smb1.recv_status = NT_STATUS_OK;
1625                 }
1626
1627                 state->inbuf = inbuf;
1628
1629                 /*
1630                  * Note: here we use talloc_reference() in a way
1631                  *       that does not expose it to the caller.
1632                  */
1633                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
1634                 if (tevent_req_nomem(inbuf_ref, req)) {
1635                         continue;
1636                 }
1637
1638                 /* copy the related buffers */
1639                 state->smb1.recv_iov[0] = iov[0];
1640                 state->smb1.recv_iov[1] = cur[0];
1641                 state->smb1.recv_iov[2] = cur[1];
1642
1643                 tevent_req_done(req);
1644         }
1645
1646         return NT_STATUS_RETRY;
1647 }
1648
1649 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
1650                           TALLOC_CTX *mem_ctx,
1651                           struct iovec **piov,
1652                           uint8_t **phdr,
1653                           uint8_t *pwct,
1654                           uint16_t **pvwv,
1655                           uint32_t *pvwv_offset,
1656                           uint32_t *pnum_bytes,
1657                           uint8_t **pbytes,
1658                           uint32_t *pbytes_offset,
1659                           uint8_t **pinbuf,
1660                           const struct smb1cli_req_expected_response *expected,
1661                           size_t num_expected)
1662 {
1663         struct smbXcli_req_state *state =
1664                 tevent_req_data(req,
1665                 struct smbXcli_req_state);
1666         NTSTATUS status = NT_STATUS_OK;
1667         struct iovec *recv_iov = NULL;
1668         uint8_t *hdr = NULL;
1669         uint8_t wct = 0;
1670         uint32_t vwv_offset = 0;
1671         uint16_t *vwv = NULL;
1672         uint32_t num_bytes = 0;
1673         uint32_t bytes_offset = 0;
1674         uint8_t *bytes = NULL;
1675         size_t i;
1676         bool found_status = false;
1677         bool found_size = false;
1678
1679         if (piov != NULL) {
1680                 *piov = NULL;
1681         }
1682         if (phdr != NULL) {
1683                 *phdr = 0;
1684         }
1685         if (pwct != NULL) {
1686                 *pwct = 0;
1687         }
1688         if (pvwv != NULL) {
1689                 *pvwv = NULL;
1690         }
1691         if (pvwv_offset != NULL) {
1692                 *pvwv_offset = 0;
1693         }
1694         if (pnum_bytes != NULL) {
1695                 *pnum_bytes = 0;
1696         }
1697         if (pbytes != NULL) {
1698                 *pbytes = NULL;
1699         }
1700         if (pbytes_offset != NULL) {
1701                 *pbytes_offset = 0;
1702         }
1703         if (pinbuf != NULL) {
1704                 *pinbuf = NULL;
1705         }
1706
1707         if (state->inbuf != NULL) {
1708                 recv_iov = state->smb1.recv_iov;
1709                 hdr = (uint8_t *)recv_iov[0].iov_base;
1710                 wct = recv_iov[1].iov_len/2;
1711                 vwv = (uint16_t *)recv_iov[1].iov_base;
1712                 vwv_offset = PTR_DIFF(vwv, hdr);
1713                 num_bytes = recv_iov[2].iov_len;
1714                 bytes = (uint8_t *)recv_iov[2].iov_base;
1715                 bytes_offset = PTR_DIFF(bytes, hdr);
1716         }
1717
1718         if (tevent_req_is_nterror(req, &status)) {
1719                 for (i=0; i < num_expected; i++) {
1720                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
1721                                 found_status = true;
1722                                 break;
1723                         }
1724                 }
1725
1726                 if (found_status) {
1727                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
1728                 }
1729
1730                 return status;
1731         }
1732
1733         if (num_expected == 0) {
1734                 found_status = true;
1735                 found_size = true;
1736         }
1737
1738         status = state->smb1.recv_status;
1739
1740         for (i=0; i < num_expected; i++) {
1741                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
1742                         continue;
1743                 }
1744
1745                 found_status = true;
1746                 if (expected[i].wct == 0) {
1747                         found_size = true;
1748                         break;
1749                 }
1750
1751                 if (expected[i].wct == wct) {
1752                         found_size = true;
1753                         break;
1754                 }
1755         }
1756
1757         if (!found_status) {
1758                 return status;
1759         }
1760
1761         if (!found_size) {
1762                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1763         }
1764
1765         if (piov != NULL) {
1766                 *piov = talloc_move(mem_ctx, &recv_iov);
1767         }
1768
1769         if (phdr != NULL) {
1770                 *phdr = hdr;
1771         }
1772         if (pwct != NULL) {
1773                 *pwct = wct;
1774         }
1775         if (pvwv != NULL) {
1776                 *pvwv = vwv;
1777         }
1778         if (pvwv_offset != NULL) {
1779                 *pvwv_offset = vwv_offset;
1780         }
1781         if (pnum_bytes != NULL) {
1782                 *pnum_bytes = num_bytes;
1783         }
1784         if (pbytes != NULL) {
1785                 *pbytes = bytes;
1786         }
1787         if (pbytes_offset != NULL) {
1788                 *pbytes_offset = bytes_offset;
1789         }
1790         if (pinbuf != NULL) {
1791                 *pinbuf = state->inbuf;
1792         }
1793
1794         return status;
1795 }
1796
1797 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
1798 {
1799         size_t wct_ofs;
1800         int i;
1801
1802         wct_ofs = HDR_WCT;
1803
1804         for (i=0; i<num_reqs; i++) {
1805                 struct smbXcli_req_state *state;
1806                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1807                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
1808                                            state->smb1.iov_count-2);
1809                 wct_ofs = (wct_ofs + 3) & ~3;
1810         }
1811         return wct_ofs;
1812 }
1813
1814 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
1815 {
1816         struct smbXcli_req_state *first_state =
1817                 tevent_req_data(reqs[0],
1818                 struct smbXcli_req_state);
1819         struct smbXcli_req_state *state;
1820         size_t wct_offset;
1821         size_t chain_padding = 0;
1822         int i, iovlen;
1823         struct iovec *iov = NULL;
1824         struct iovec *this_iov;
1825         NTSTATUS status;
1826         size_t nbt_len;
1827
1828         if (num_reqs == 1) {
1829                 return smb1cli_req_writev_submit(reqs[0], first_state,
1830                                                  first_state->smb1.iov,
1831                                                  first_state->smb1.iov_count);
1832         }
1833
1834         iovlen = 0;
1835         for (i=0; i<num_reqs; i++) {
1836                 if (!tevent_req_is_in_progress(reqs[i])) {
1837                         return NT_STATUS_INTERNAL_ERROR;
1838                 }
1839
1840                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1841
1842                 if (state->smb1.iov_count < 4) {
1843                         return NT_STATUS_INVALID_PARAMETER_MIX;
1844                 }
1845
1846                 if (i == 0) {
1847                         /*
1848                          * The NBT and SMB header
1849                          */
1850                         iovlen += 2;
1851                 } else {
1852                         /*
1853                          * Chain padding
1854                          */
1855                         iovlen += 1;
1856                 }
1857
1858                 /*
1859                  * words and bytes
1860                  */
1861                 iovlen += state->smb1.iov_count - 2;
1862         }
1863
1864         iov = talloc_zero_array(first_state, struct iovec, iovlen);
1865         if (iov == NULL) {
1866                 return NT_STATUS_NO_MEMORY;
1867         }
1868
1869         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
1870                 first_state, reqs, sizeof(*reqs) * num_reqs);
1871         if (first_state->smb1.chained_requests == NULL) {
1872                 TALLOC_FREE(iov);
1873                 return NT_STATUS_NO_MEMORY;
1874         }
1875
1876         wct_offset = HDR_WCT;
1877         this_iov = iov;
1878
1879         for (i=0; i<num_reqs; i++) {
1880                 size_t next_padding = 0;
1881                 uint16_t *vwv;
1882
1883                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1884
1885                 if (i < num_reqs-1) {
1886                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
1887                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
1888                                 TALLOC_FREE(iov);
1889                                 TALLOC_FREE(first_state->smb1.chained_requests);
1890                                 return NT_STATUS_INVALID_PARAMETER_MIX;
1891                         }
1892                 }
1893
1894                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
1895                                               state->smb1.iov_count-2) + 1;
1896                 if ((wct_offset % 4) != 0) {
1897                         next_padding = 4 - (wct_offset % 4);
1898                 }
1899                 wct_offset += next_padding;
1900                 vwv = state->smb1.vwv;
1901
1902                 if (i < num_reqs-1) {
1903                         struct smbXcli_req_state *next_state =
1904                                 tevent_req_data(reqs[i+1],
1905                                 struct smbXcli_req_state);
1906                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
1907                         SCVAL(vwv+0, 1, 0);
1908                         SSVAL(vwv+1, 0, wct_offset);
1909                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
1910                         /* properly end the chain */
1911                         SCVAL(vwv+0, 0, 0xff);
1912                         SCVAL(vwv+0, 1, 0xff);
1913                         SSVAL(vwv+1, 0, 0);
1914                 }
1915
1916                 if (i == 0) {
1917                         /*
1918                          * The NBT and SMB header
1919                          */
1920                         this_iov[0] = state->smb1.iov[0];
1921                         this_iov[1] = state->smb1.iov[1];
1922                         this_iov += 2;
1923                 } else {
1924                         /*
1925                          * This one is a bit subtle. We have to add
1926                          * chain_padding bytes between the requests, and we
1927                          * have to also include the wct field of the
1928                          * subsequent requests. We use the subsequent header
1929                          * for the padding, it contains the wct field in its
1930                          * last byte.
1931                          */
1932                         this_iov[0].iov_len = chain_padding+1;
1933                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
1934                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
1935                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
1936                         this_iov += 1;
1937                 }
1938
1939                 /*
1940                  * copy the words and bytes
1941                  */
1942                 memcpy(this_iov, state->smb1.iov+2,
1943                        sizeof(struct iovec) * (state->smb1.iov_count-2));
1944                 this_iov += state->smb1.iov_count - 2;
1945                 chain_padding = next_padding;
1946         }
1947
1948         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
1949         if (nbt_len > first_state->conn->smb1.max_xmit) {
1950                 TALLOC_FREE(iov);
1951                 TALLOC_FREE(first_state->smb1.chained_requests);
1952                 return NT_STATUS_INVALID_PARAMETER_MIX;
1953         }
1954
1955         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
1956         if (!NT_STATUS_IS_OK(status)) {
1957                 TALLOC_FREE(iov);
1958                 TALLOC_FREE(first_state->smb1.chained_requests);
1959                 return status;
1960         }
1961
1962         return NT_STATUS_OK;
1963 }
1964
1965 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
1966 {
1967         return ((tevent_queue_length(conn->outgoing) != 0)
1968                 || (talloc_array_length(conn->pending) != 0));
1969 }
1970
1971 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
1972 {
1973         return conn->smb2.server.capabilities;
1974 }
1975
1976 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
1977 {
1978         return conn->smb2.server.security_mode;
1979 }
1980
1981 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
1982 {
1983         return conn->smb2.server.max_trans_size;
1984 }
1985
1986 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
1987 {
1988         return conn->smb2.server.max_read_size;
1989 }
1990
1991 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
1992 {
1993         return conn->smb2.server.max_write_size;
1994 }
1995
1996 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
1997                                   uint16_t max_credits)
1998 {
1999         conn->smb2.max_credits = max_credits;
2000 }
2001
2002 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2003                                       struct tevent_context *ev,
2004                                       struct smbXcli_conn *conn,
2005                                       uint16_t cmd,
2006                                       uint32_t additional_flags,
2007                                       uint32_t clear_flags,
2008                                       uint32_t timeout_msec,
2009                                       uint32_t pid,
2010                                       uint32_t tid,
2011                                       struct smbXcli_session *session,
2012                                       const uint8_t *fixed,
2013                                       uint16_t fixed_len,
2014                                       const uint8_t *dyn,
2015                                       uint32_t dyn_len)
2016 {
2017         struct tevent_req *req;
2018         struct smbXcli_req_state *state;
2019         uint32_t flags = 0;
2020         uint64_t uid = 0;
2021
2022         req = tevent_req_create(mem_ctx, &state,
2023                                 struct smbXcli_req_state);
2024         if (req == NULL) {
2025                 return NULL;
2026         }
2027
2028         state->ev = ev;
2029         state->conn = conn;
2030         state->session = session;
2031
2032         if (session) {
2033                 uid = session->smb2.session_id;
2034         }
2035
2036         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2037         if (state->smb2.recv_iov == NULL) {
2038                 TALLOC_FREE(req);
2039                 return NULL;
2040         }
2041
2042         flags |= additional_flags;
2043         flags &= ~clear_flags;
2044
2045         state->smb2.fixed = fixed;
2046         state->smb2.fixed_len = fixed_len;
2047         state->smb2.dyn = dyn;
2048         state->smb2.dyn_len = dyn_len;
2049
2050         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2051         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2052         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2053         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2054         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            pid);
2055         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2056         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2057
2058         switch (cmd) {
2059         case SMB2_OP_CANCEL:
2060                 state->one_way = true;
2061                 break;
2062         case SMB2_OP_BREAK:
2063                 /*
2064                  * If this is a dummy request, it will have
2065                  * UINT64_MAX as message id.
2066                  * If we send on break acknowledgement,
2067                  * this gets overwritten later.
2068                  */
2069                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2070                 break;
2071         }
2072
2073         if (timeout_msec > 0) {
2074                 struct timeval endtime;
2075
2076                 endtime = timeval_current_ofs_msec(timeout_msec);
2077                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2078                         return req;
2079                 }
2080         }
2081
2082         return req;
2083 }
2084
2085 static void smb2cli_writev_done(struct tevent_req *subreq);
2086 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2087                                                TALLOC_CTX *tmp_mem,
2088                                                uint8_t *inbuf);
2089
2090 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2091                                      int num_reqs)
2092 {
2093         struct smbXcli_req_state *state;
2094         struct tevent_req *subreq;
2095         struct iovec *iov;
2096         int i, num_iov, nbt_len;
2097
2098         /*
2099          * 1 for the nbt length
2100          * per request: HDR, fixed, dyn, padding
2101          * -1 because the last one does not need padding
2102          */
2103
2104         iov = talloc_array(reqs[0], struct iovec, 1 + 4*num_reqs - 1);
2105         if (iov == NULL) {
2106                 return NT_STATUS_NO_MEMORY;
2107         }
2108
2109         num_iov = 1;
2110         nbt_len = 0;
2111
2112         for (i=0; i<num_reqs; i++) {
2113                 int hdr_iov;
2114                 size_t reqlen;
2115                 bool ret;
2116                 uint64_t avail;
2117                 uint16_t charge;
2118                 uint16_t credits;
2119                 uint64_t mid;
2120
2121                 if (!tevent_req_is_in_progress(reqs[i])) {
2122                         return NT_STATUS_INTERNAL_ERROR;
2123                 }
2124
2125                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2126
2127                 if (!smbXcli_conn_is_connected(state->conn)) {
2128                         return NT_STATUS_CONNECTION_DISCONNECTED;
2129                 }
2130
2131                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2132                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2133                         return NT_STATUS_REVISION_MISMATCH;
2134                 }
2135
2136                 avail = UINT64_MAX - state->conn->smb2.mid;
2137                 if (avail < 1) {
2138                         return NT_STATUS_CONNECTION_ABORTED;
2139                 }
2140
2141                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2142                         charge = (MAX(state->smb2.dyn_len, 1) - 1)/ 65536 + 1;
2143                 } else {
2144                         charge = 1;
2145                 }
2146
2147                 charge = MAX(state->smb2.credit_charge, charge);
2148
2149                 avail = MIN(avail, state->conn->smb2.cur_credits);
2150                 if (avail < charge) {
2151                         return NT_STATUS_INTERNAL_ERROR;
2152                 }
2153
2154                 credits = 0;
2155                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2156                         credits = state->conn->smb2.max_credits -
2157                                   state->conn->smb2.cur_credits;
2158                 }
2159                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2160                         credits += 1;
2161                 }
2162
2163                 mid = state->conn->smb2.mid;
2164                 state->conn->smb2.mid += charge;
2165                 state->conn->smb2.cur_credits -= charge;
2166
2167                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2168                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2169                 }
2170                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2171                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2172
2173                 hdr_iov = num_iov;
2174                 iov[num_iov].iov_base = state->smb2.hdr;
2175                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2176                 num_iov += 1;
2177
2178                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2179                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2180                 num_iov += 1;
2181
2182                 if (state->smb2.dyn != NULL) {
2183                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2184                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2185                         num_iov += 1;
2186                 }
2187
2188                 reqlen  = sizeof(state->smb2.hdr);
2189                 reqlen += state->smb2.fixed_len;
2190                 reqlen += state->smb2.dyn_len;
2191
2192                 if (i < num_reqs-1) {
2193                         if ((reqlen % 8) > 0) {
2194                                 uint8_t pad = 8 - (reqlen % 8);
2195                                 iov[num_iov].iov_base = state->smb2.pad;
2196                                 iov[num_iov].iov_len = pad;
2197                                 num_iov += 1;
2198                                 reqlen += pad;
2199                         }
2200                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2201                 }
2202                 nbt_len += reqlen;
2203
2204                 if (state->session && state->session->smb2.should_sign) {
2205                         NTSTATUS status;
2206
2207                         status = smb2_signing_sign_pdu(state->session->smb2.signing_key,
2208                                                        &iov[hdr_iov], num_iov - hdr_iov);
2209                         if (!NT_STATUS_IS_OK(status)) {
2210                                 return status;
2211                         }
2212                 }
2213
2214                 ret = smbXcli_req_set_pending(reqs[i]);
2215                 if (!ret) {
2216                         return NT_STATUS_NO_MEMORY;
2217                 }
2218         }
2219
2220         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2221         _smb_setlen_tcp(state->length_hdr, nbt_len);
2222         iov[0].iov_base = state->length_hdr;
2223         iov[0].iov_len  = sizeof(state->length_hdr);
2224
2225         if (state->conn->dispatch_incoming == NULL) {
2226                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2227         }
2228
2229         subreq = writev_send(state, state->ev, state->conn->outgoing,
2230                              state->conn->fd, false, iov, num_iov);
2231         if (subreq == NULL) {
2232                 return NT_STATUS_NO_MEMORY;
2233         }
2234         tevent_req_set_callback(subreq, smb2cli_writev_done, reqs[0]);
2235         return NT_STATUS_OK;
2236 }
2237
2238 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
2239 {
2240         struct smbXcli_req_state *state =
2241                 tevent_req_data(req,
2242                 struct smbXcli_req_state);
2243
2244         state->smb2.credit_charge = charge;
2245 }
2246
2247 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
2248                                     struct tevent_context *ev,
2249                                     struct smbXcli_conn *conn,
2250                                     uint16_t cmd,
2251                                     uint32_t additional_flags,
2252                                     uint32_t clear_flags,
2253                                     uint32_t timeout_msec,
2254                                     uint32_t pid,
2255                                     uint32_t tid,
2256                                     struct smbXcli_session *session,
2257                                     const uint8_t *fixed,
2258                                     uint16_t fixed_len,
2259                                     const uint8_t *dyn,
2260                                     uint32_t dyn_len)
2261 {
2262         struct tevent_req *req;
2263         NTSTATUS status;
2264
2265         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
2266                                  additional_flags, clear_flags,
2267                                  timeout_msec,
2268                                  pid, tid, session,
2269                                  fixed, fixed_len, dyn, dyn_len);
2270         if (req == NULL) {
2271                 return NULL;
2272         }
2273         if (!tevent_req_is_in_progress(req)) {
2274                 return tevent_req_post(req, ev);
2275         }
2276         status = smb2cli_req_compound_submit(&req, 1);
2277         if (tevent_req_nterror(req, status)) {
2278                 return tevent_req_post(req, ev);
2279         }
2280         return req;
2281 }
2282
2283 static void smb2cli_writev_done(struct tevent_req *subreq)
2284 {
2285         struct tevent_req *req =
2286                 tevent_req_callback_data(subreq,
2287                 struct tevent_req);
2288         struct smbXcli_req_state *state =
2289                 tevent_req_data(req,
2290                 struct smbXcli_req_state);
2291         ssize_t nwritten;
2292         int err;
2293
2294         nwritten = writev_recv(subreq, &err);
2295         TALLOC_FREE(subreq);
2296         if (nwritten == -1) {
2297                 /* here, we need to notify all pending requests */
2298                 NTSTATUS status = map_nt_error_from_unix_common(err);
2299                 smbXcli_conn_disconnect(state->conn, status);
2300                 return;
2301         }
2302 }
2303
2304 static NTSTATUS smb2cli_inbuf_parse_compound(uint8_t *buf, TALLOC_CTX *mem_ctx,
2305                                              struct iovec **piov, int *pnum_iov)
2306 {
2307         struct iovec *iov;
2308         int num_iov;
2309         size_t buflen;
2310         size_t taken;
2311         uint8_t *first_hdr;
2312
2313         num_iov = 0;
2314
2315         iov = talloc_array(mem_ctx, struct iovec, num_iov);
2316         if (iov == NULL) {
2317                 return NT_STATUS_NO_MEMORY;
2318         }
2319
2320         buflen = smb_len_tcp(buf);
2321         taken = 0;
2322         first_hdr = buf + NBT_HDR_SIZE;
2323
2324         while (taken < buflen) {
2325                 size_t len = buflen - taken;
2326                 uint8_t *hdr = first_hdr + taken;
2327                 struct iovec *cur;
2328                 size_t full_size;
2329                 size_t next_command_ofs;
2330                 uint16_t body_size;
2331                 struct iovec *iov_tmp;
2332
2333                 /*
2334                  * We need the header plus the body length field
2335                  */
2336
2337                 if (len < SMB2_HDR_BODY + 2) {
2338                         DEBUG(10, ("%d bytes left, expected at least %d\n",
2339                                    (int)len, SMB2_HDR_BODY));
2340                         goto inval;
2341                 }
2342                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
2343                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
2344                                    IVAL(hdr, 0)));
2345                         goto inval;
2346                 }
2347                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
2348                         DEBUG(10, ("Got HDR len %d, expected %d\n",
2349                                    SVAL(hdr, 4), SMB2_HDR_BODY));
2350                         goto inval;
2351                 }
2352
2353                 full_size = len;
2354                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
2355                 body_size = SVAL(hdr, SMB2_HDR_BODY);
2356
2357                 if (next_command_ofs != 0) {
2358                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
2359                                 goto inval;
2360                         }
2361                         if (next_command_ofs > full_size) {
2362                                 goto inval;
2363                         }
2364                         full_size = next_command_ofs;
2365                 }
2366                 if (body_size < 2) {
2367                         goto inval;
2368                 }
2369                 body_size &= 0xfffe;
2370
2371                 if (body_size > (full_size - SMB2_HDR_BODY)) {
2372                         goto inval;
2373                 }
2374
2375                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
2376                                          num_iov + 3);
2377                 if (iov_tmp == NULL) {
2378                         TALLOC_FREE(iov);
2379                         return NT_STATUS_NO_MEMORY;
2380                 }
2381                 iov = iov_tmp;
2382                 cur = &iov[num_iov];
2383                 num_iov += 3;
2384
2385                 cur[0].iov_base = hdr;
2386                 cur[0].iov_len  = SMB2_HDR_BODY;
2387                 cur[1].iov_base = hdr + SMB2_HDR_BODY;
2388                 cur[1].iov_len  = body_size;
2389                 cur[2].iov_base = hdr + SMB2_HDR_BODY + body_size;
2390                 cur[2].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
2391
2392                 taken += full_size;
2393         }
2394
2395         *piov = iov;
2396         *pnum_iov = num_iov;
2397         return NT_STATUS_OK;
2398
2399 inval:
2400         TALLOC_FREE(iov);
2401         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2402 }
2403
2404 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
2405                                                     uint64_t mid)
2406 {
2407         size_t num_pending = talloc_array_length(conn->pending);
2408         size_t i;
2409
2410         for (i=0; i<num_pending; i++) {
2411                 struct tevent_req *req = conn->pending[i];
2412                 struct smbXcli_req_state *state =
2413                         tevent_req_data(req,
2414                         struct smbXcli_req_state);
2415
2416                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
2417                         return req;
2418                 }
2419         }
2420         return NULL;
2421 }
2422
2423 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2424                                                TALLOC_CTX *tmp_mem,
2425                                                uint8_t *inbuf)
2426 {
2427         struct tevent_req *req;
2428         struct smbXcli_req_state *state = NULL;
2429         struct iovec *iov;
2430         int i, num_iov;
2431         NTSTATUS status;
2432         bool defer = true;
2433         struct smbXcli_session *last_session = NULL;
2434
2435         status = smb2cli_inbuf_parse_compound(inbuf, tmp_mem,
2436                                               &iov, &num_iov);
2437         if (!NT_STATUS_IS_OK(status)) {
2438                 return status;
2439         }
2440
2441         for (i=0; i<num_iov; i+=3) {
2442                 uint8_t *inbuf_ref = NULL;
2443                 struct iovec *cur = &iov[i];
2444                 uint8_t *inhdr = (uint8_t *)cur[0].iov_base;
2445                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
2446                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
2447                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
2448                 uint16_t req_opcode;
2449                 uint32_t req_flags;
2450                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
2451                 uint32_t new_credits;
2452                 struct smbXcli_session *session = NULL;
2453                 const DATA_BLOB *signing_key = NULL;
2454
2455                 new_credits = conn->smb2.cur_credits;
2456                 new_credits += credits;
2457                 if (new_credits > UINT16_MAX) {
2458                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2459                 }
2460                 conn->smb2.cur_credits += credits;
2461
2462                 req = smb2cli_conn_find_pending(conn, mid);
2463                 if (req == NULL) {
2464                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2465                 }
2466                 state = tevent_req_data(req, struct smbXcli_req_state);
2467
2468                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2469                 if (opcode != req_opcode) {
2470                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2471                 }
2472                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2473
2474                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
2475                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2476                 }
2477
2478                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
2479                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
2480                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
2481                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
2482
2483                         /*
2484                          * async interim responses are not signed,
2485                          * even if the SMB2_HDR_FLAG_SIGNED flag
2486                          * is set.
2487                          */
2488                         req_flags |= SMB2_HDR_FLAG_ASYNC;
2489                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
2490                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
2491                         continue;
2492                 }
2493
2494                 session = state->session;
2495                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
2496                         session = last_session;
2497                 }
2498                 last_session = session;
2499
2500                 if (session && session->smb2.should_sign) {
2501                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
2502                                 return NT_STATUS_ACCESS_DENIED;
2503                         }
2504                 }
2505
2506                 if (flags & SMB2_HDR_FLAG_SIGNED) {
2507                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
2508
2509                         if (session == NULL) {
2510                                 struct smbXcli_session *s;
2511
2512                                 s = state->conn->sessions;
2513                                 for (; s; s = s->next) {
2514                                         if (s->smb2.session_id != uid) {
2515                                                 continue;
2516                                         }
2517
2518                                         session = s;
2519                                         break;
2520                                 }
2521                         }
2522
2523                         if (session == NULL) {
2524                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2525                         }
2526
2527                         last_session = session;
2528                         signing_key = &session->smb2.signing_key;
2529                 }
2530
2531                 if ((opcode == SMB2_OP_SESSSETUP) &&
2532                      NT_STATUS_IS_OK(status)) {
2533                         /*
2534                          * the caller has to check the signing
2535                          * as only the caller knows the correct
2536                          * session key
2537                          */
2538                         signing_key = NULL;
2539                 }
2540
2541                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
2542                         /*
2543                          * if the server returns NT_STATUS_USER_SESSION_DELETED
2544                          * the response is not signed and we should
2545                          * propagate the NT_STATUS_USER_SESSION_DELETED
2546                          * status to the caller.
2547                          */
2548                         if (signing_key) {
2549                                 signing_key = NULL;
2550                         }
2551                 }
2552
2553                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
2554                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
2555                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
2556                         /*
2557                          * if the server returns
2558                          * NT_STATUS_NETWORK_NAME_DELETED
2559                          * NT_STATUS_FILE_CLOSED
2560                          * NT_STATUS_INVALID_PARAMETER
2561                          * the response might not be signed
2562                          * as this happens before the signing checks.
2563                          *
2564                          * If server echos the signature (or all zeros)
2565                          * we should report the status from the server
2566                          * to the caller.
2567                          */
2568                         if (signing_key) {
2569                                 int cmp;
2570
2571                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2572                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
2573                                              16);
2574                                 if (cmp == 0) {
2575                                         state->smb2.signing_skipped = true;
2576                                         signing_key = NULL;
2577                                 }
2578                         }
2579                         if (signing_key) {
2580                                 int cmp;
2581                                 static const uint8_t zeros[16];
2582
2583                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2584                                              zeros,
2585                                              16);
2586                                 if (cmp == 0) {
2587                                         state->smb2.signing_skipped = true;
2588                                         signing_key = NULL;
2589                                 }
2590                         }
2591                 }
2592
2593                 if (signing_key) {
2594                         status = smb2_signing_check_pdu(*signing_key, cur, 3);
2595                         if (!NT_STATUS_IS_OK(status)) {
2596                                 /*
2597                                  * If the signing check fails, we disconnect
2598                                  * the connection.
2599                                  */
2600                                 return status;
2601                         }
2602                 }
2603
2604                 smbXcli_req_unset_pending(req);
2605
2606                 /*
2607                  * There might be more than one response
2608                  * we need to defer the notifications
2609                  */
2610                 if ((num_iov == 4) && (talloc_array_length(conn->pending) == 0)) {
2611                         defer = false;
2612                 }
2613
2614                 if (defer) {
2615                         tevent_req_defer_callback(req, state->ev);
2616                 }
2617
2618                 /*
2619                  * Note: here we use talloc_reference() in a way
2620                  *       that does not expose it to the caller.
2621                  */
2622                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
2623                 if (tevent_req_nomem(inbuf_ref, req)) {
2624                         continue;
2625                 }
2626
2627                 /* copy the related buffers */
2628                 state->smb2.recv_iov[0] = cur[0];
2629                 state->smb2.recv_iov[1] = cur[1];
2630                 state->smb2.recv_iov[2] = cur[2];
2631
2632                 tevent_req_done(req);
2633         }
2634
2635         if (defer) {
2636                 return NT_STATUS_RETRY;
2637         }
2638
2639         return NT_STATUS_OK;
2640 }
2641
2642 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2643                           struct iovec **piov,
2644                           const struct smb2cli_req_expected_response *expected,
2645                           size_t num_expected)
2646 {
2647         struct smbXcli_req_state *state =
2648                 tevent_req_data(req,
2649                 struct smbXcli_req_state);
2650         NTSTATUS status;
2651         size_t body_size;
2652         bool found_status = false;
2653         bool found_size = false;
2654         size_t i;
2655
2656         if (piov != NULL) {
2657                 *piov = NULL;
2658         }
2659
2660         if (tevent_req_is_nterror(req, &status)) {
2661                 for (i=0; i < num_expected; i++) {
2662                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2663                                 found_status = true;
2664                                 break;
2665                         }
2666                 }
2667
2668                 if (found_status) {
2669                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2670                 }
2671
2672                 return status;
2673         }
2674
2675         if (num_expected == 0) {
2676                 found_status = true;
2677                 found_size = true;
2678         }
2679
2680         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
2681         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
2682
2683         for (i=0; i < num_expected; i++) {
2684                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2685                         continue;
2686                 }
2687
2688                 found_status = true;
2689                 if (expected[i].body_size == 0) {
2690                         found_size = true;
2691                         break;
2692                 }
2693
2694                 if (expected[i].body_size == body_size) {
2695                         found_size = true;
2696                         break;
2697                 }
2698         }
2699
2700         if (!found_status) {
2701                 return status;
2702         }
2703
2704         if (state->smb2.signing_skipped) {
2705                 if (num_expected > 0) {
2706                         return NT_STATUS_ACCESS_DENIED;
2707                 }
2708                 if (!NT_STATUS_IS_ERR(status)) {
2709                         return NT_STATUS_ACCESS_DENIED;
2710                 }
2711         }
2712
2713         if (!found_size) {
2714                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2715         }
2716
2717         if (piov != NULL) {
2718                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
2719         }
2720
2721         return status;
2722 }
2723
2724 static const struct {
2725         enum protocol_types proto;
2726         const char *smb1_name;
2727 } smb1cli_prots[] = {
2728         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
2729         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
2730         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
2731         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
2732         {PROTOCOL_LANMAN2,      "LM1.2X002"},
2733         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
2734         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
2735         {PROTOCOL_LANMAN2,      "Samba"},
2736         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
2737         {PROTOCOL_NT1,          "NT LM 0.12"},
2738         {PROTOCOL_SMB2_02,      "SMB 2.002"},
2739         {PROTOCOL_SMB2_10,      "SMB 2.???"},
2740 };
2741
2742 static const struct {
2743         enum protocol_types proto;
2744         uint16_t smb2_dialect;
2745 } smb2cli_prots[] = {
2746         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
2747         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
2748         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
2749 };
2750
2751 struct smbXcli_negprot_state {
2752         struct smbXcli_conn *conn;
2753         struct tevent_context *ev;
2754         uint32_t timeout_msec;
2755         enum protocol_types min_protocol;
2756         enum protocol_types max_protocol;
2757
2758         struct {
2759                 uint8_t fixed[36];
2760                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
2761         } smb2;
2762 };
2763
2764 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
2765 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
2766 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
2767 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
2768 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
2769 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
2770                                                   TALLOC_CTX *frame,
2771                                                   uint8_t *inbuf);
2772
2773 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
2774                                         struct tevent_context *ev,
2775                                         struct smbXcli_conn *conn,
2776                                         uint32_t timeout_msec,
2777                                         enum protocol_types min_protocol,
2778                                         enum protocol_types max_protocol)
2779 {
2780         struct tevent_req *req, *subreq;
2781         struct smbXcli_negprot_state *state;
2782
2783         req = tevent_req_create(mem_ctx, &state,
2784                                 struct smbXcli_negprot_state);
2785         if (req == NULL) {
2786                 return NULL;
2787         }
2788         state->conn = conn;
2789         state->ev = ev;
2790         state->timeout_msec = timeout_msec;
2791         state->min_protocol = min_protocol;
2792         state->max_protocol = max_protocol;
2793
2794         if (min_protocol == PROTOCOL_NONE) {
2795                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2796                 return tevent_req_post(req, ev);
2797         }
2798
2799         if (max_protocol == PROTOCOL_NONE) {
2800                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2801                 return tevent_req_post(req, ev);
2802         }
2803
2804         if (min_protocol > max_protocol) {
2805                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2806                 return tevent_req_post(req, ev);
2807         }
2808
2809         if ((min_protocol < PROTOCOL_SMB2_02) &&
2810             (max_protocol < PROTOCOL_SMB2_02)) {
2811                 /*
2812                  * SMB1 only...
2813                  */
2814                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
2815
2816                 subreq = smbXcli_negprot_smb1_subreq(state);
2817                 if (tevent_req_nomem(subreq, req)) {
2818                         return tevent_req_post(req, ev);
2819                 }
2820                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
2821                 return req;
2822         }
2823
2824         if ((min_protocol >= PROTOCOL_SMB2_02) &&
2825             (max_protocol >= PROTOCOL_SMB2_02)) {
2826                 /*
2827                  * SMB2 only...
2828                  */
2829                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2830
2831                 subreq = smbXcli_negprot_smb2_subreq(state);
2832                 if (tevent_req_nomem(subreq, req)) {
2833                         return tevent_req_post(req, ev);
2834                 }
2835                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
2836                 return req;
2837         }
2838
2839         /*
2840          * We send an SMB1 negprot with the SMB2 dialects
2841          * and expect a SMB1 or a SMB2 response.
2842          *
2843          * smbXcli_negprot_dispatch_incoming() will fix the
2844          * callback to match protocol of the response.
2845          */
2846         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
2847
2848         subreq = smbXcli_negprot_smb1_subreq(state);
2849         if (tevent_req_nomem(subreq, req)) {
2850                 return tevent_req_post(req, ev);
2851         }
2852         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
2853         return req;
2854 }
2855
2856 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
2857 {
2858         struct tevent_req *req =
2859                 tevent_req_callback_data(subreq,
2860                 struct tevent_req);
2861         NTSTATUS status;
2862
2863         /*
2864          * we just want the low level error
2865          */
2866         status = tevent_req_simple_recv_ntstatus(subreq);
2867         TALLOC_FREE(subreq);
2868         if (tevent_req_nterror(req, status)) {
2869                 return;
2870         }
2871
2872         /* this should never happen */
2873         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2874 }
2875
2876 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
2877 {
2878         size_t i;
2879         DATA_BLOB bytes = data_blob_null;
2880         uint8_t flags;
2881         uint16_t flags2;
2882
2883         /* setup the protocol strings */
2884         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
2885                 uint8_t c = 2;
2886                 bool ok;
2887
2888                 if (smb1cli_prots[i].proto < state->min_protocol) {
2889                         continue;
2890                 }
2891
2892                 if (smb1cli_prots[i].proto > state->max_protocol) {
2893                         continue;
2894                 }
2895
2896                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
2897                 if (!ok) {
2898                         return NULL;
2899                 }
2900
2901                 /*
2902                  * We now it is already ascii and
2903                  * we want NULL termination.
2904                  */
2905                 ok = data_blob_append(state, &bytes,
2906                                       smb1cli_prots[i].smb1_name,
2907                                       strlen(smb1cli_prots[i].smb1_name)+1);
2908                 if (!ok) {
2909                         return NULL;
2910                 }
2911         }
2912
2913         smb1cli_req_flags(state->max_protocol,
2914                           state->conn->smb1.client.capabilities,
2915                           SMBnegprot,
2916                           0, 0, &flags,
2917                           0, 0, &flags2);
2918
2919         return smb1cli_req_send(state, state->ev, state->conn,
2920                                 SMBnegprot,
2921                                 flags, ~flags,
2922                                 flags2, ~flags2,
2923                                 state->timeout_msec,
2924                                 0xFFFE, 0, 0, /* pid, tid, uid */
2925                                 0, NULL, /* wct, vwv */
2926                                 bytes.length, bytes.data);
2927 }
2928
2929 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
2930 {
2931         struct tevent_req *req =
2932                 tevent_req_callback_data(subreq,
2933                 struct tevent_req);
2934         struct smbXcli_negprot_state *state =
2935                 tevent_req_data(req,
2936                 struct smbXcli_negprot_state);
2937         struct smbXcli_conn *conn = state->conn;
2938         struct iovec *recv_iov = NULL;
2939         uint8_t *inhdr;
2940         uint8_t wct;
2941         uint16_t *vwv;
2942         uint32_t num_bytes;
2943         uint8_t *bytes;
2944         NTSTATUS status;
2945         uint16_t protnum;
2946         size_t i;
2947         size_t num_prots = 0;
2948         uint8_t flags;
2949         uint32_t client_capabilities = conn->smb1.client.capabilities;
2950         uint32_t both_capabilities;
2951         uint32_t server_capabilities = 0;
2952         uint32_t capabilities;
2953         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
2954         uint32_t server_max_xmit = 0;
2955         uint32_t max_xmit;
2956         uint32_t server_max_mux = 0;
2957         uint16_t server_security_mode = 0;
2958         uint32_t server_session_key = 0;
2959         bool server_readbraw = false;
2960         bool server_writebraw = false;
2961         bool server_lockread = false;
2962         bool server_writeunlock = false;
2963         struct GUID server_guid = GUID_zero();
2964         DATA_BLOB server_gss_blob = data_blob_null;
2965         uint8_t server_challenge[8];
2966         char *server_workgroup = NULL;
2967         char *server_name = NULL;
2968         int server_time_zone = 0;
2969         NTTIME server_system_time = 0;
2970         static const struct smb1cli_req_expected_response expected[] = {
2971         {
2972                 .status = NT_STATUS_OK,
2973                 .wct = 0x11, /* NT1 */
2974         },
2975         {
2976                 .status = NT_STATUS_OK,
2977                 .wct = 0x0D, /* LM */
2978         },
2979         {
2980                 .status = NT_STATUS_OK,
2981                 .wct = 0x01, /* CORE */
2982         }
2983         };
2984
2985         ZERO_STRUCT(server_challenge);
2986
2987         status = smb1cli_req_recv(subreq, state,
2988                                   &recv_iov,
2989                                   &inhdr,
2990                                   &wct,
2991                                   &vwv,
2992                                   NULL, /* pvwv_offset */
2993                                   &num_bytes,
2994                                   &bytes,
2995                                   NULL, /* pbytes_offset */
2996                                   NULL, /* pinbuf */
2997                                   expected, ARRAY_SIZE(expected));
2998         TALLOC_FREE(subreq);
2999         if (tevent_req_nterror(req, status)) {
3000                 return;
3001         }
3002
3003         flags = CVAL(inhdr, HDR_FLG);
3004
3005         protnum = SVAL(vwv, 0);
3006
3007         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3008                 if (smb1cli_prots[i].proto < state->min_protocol) {
3009                         continue;
3010                 }
3011
3012                 if (smb1cli_prots[i].proto > state->max_protocol) {
3013                         continue;
3014                 }
3015
3016                 if (protnum != num_prots) {
3017                         num_prots++;
3018                         continue;
3019                 }
3020
3021                 conn->protocol = smb1cli_prots[i].proto;
3022                 break;
3023         }
3024
3025         if (conn->protocol == PROTOCOL_NONE) {
3026                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3027                 return;
3028         }
3029
3030         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
3031                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
3032                          "and the selected protocol level doesn't support it.\n"));
3033                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3034                 return;
3035         }
3036
3037         if (flags & FLAG_SUPPORT_LOCKREAD) {
3038                 server_lockread = true;
3039                 server_writeunlock = true;
3040         }
3041
3042         if (conn->protocol >= PROTOCOL_NT1) {
3043                 const char *client_signing = NULL;
3044                 bool server_mandatory = false;
3045                 bool server_allowed = false;
3046                 const char *server_signing = NULL;
3047                 bool ok;
3048                 uint8_t key_len;
3049
3050                 if (wct != 0x11) {
3051                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3052                         return;
3053                 }
3054
3055                 /* NT protocol */
3056                 server_security_mode = CVAL(vwv + 1, 0);
3057                 server_max_mux = SVAL(vwv + 1, 1);
3058                 server_max_xmit = IVAL(vwv + 3, 1);
3059                 server_session_key = IVAL(vwv + 7, 1);
3060                 server_time_zone = SVALS(vwv + 15, 1);
3061                 server_time_zone *= 60;
3062                 /* this time arrives in real GMT */
3063                 server_system_time = BVAL(vwv + 11, 1);
3064                 server_capabilities = IVAL(vwv + 9, 1);
3065
3066                 key_len = CVAL(vwv + 16, 1);
3067
3068                 if (server_capabilities & CAP_RAW_MODE) {
3069                         server_readbraw = true;
3070                         server_writebraw = true;
3071                 }
3072                 if (server_capabilities & CAP_LOCK_AND_READ) {
3073                         server_lockread = true;
3074                 }
3075
3076                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
3077                         DATA_BLOB blob1, blob2;
3078
3079                         if (num_bytes < 16) {
3080                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3081                                 return;
3082                         }
3083
3084                         blob1 = data_blob_const(bytes, 16);
3085                         status = GUID_from_data_blob(&blob1, &server_guid);
3086                         if (tevent_req_nterror(req, status)) {
3087                                 return;
3088                         }
3089
3090                         blob1 = data_blob_const(bytes+16, num_bytes-16);
3091                         blob2 = data_blob_dup_talloc(state, blob1);
3092                         if (blob1.length > 0 &&
3093                             tevent_req_nomem(blob2.data, req)) {
3094                                 return;
3095                         }
3096                         server_gss_blob = blob2;
3097                 } else {
3098                         DATA_BLOB blob1, blob2;
3099
3100                         if (num_bytes < key_len) {
3101                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3102                                 return;
3103                         }
3104
3105                         if (key_len != 0 && key_len != 8) {
3106                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3107                                 return;
3108                         }
3109
3110                         if (key_len == 8) {
3111                                 memcpy(server_challenge, bytes, 8);
3112                         }
3113
3114                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3115                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
3116                         if (blob1.length > 0) {
3117                                 size_t len;
3118
3119                                 len = utf16_len_n(blob1.data,
3120                                                   blob1.length);
3121                                 blob1.length = len;
3122
3123                                 ok = convert_string_talloc(state,
3124                                                            CH_UTF16LE,
3125                                                            CH_UNIX,
3126                                                            blob1.data,
3127                                                            blob1.length,
3128                                                            &server_workgroup,
3129                                                            &len);
3130                                 if (!ok) {
3131                                         status = map_nt_error_from_unix_common(errno);
3132                                         tevent_req_nterror(req, status);
3133                                         return;
3134                                 }
3135                         }
3136
3137                         blob2.data += blob1.length;
3138                         blob2.length -= blob1.length;
3139                         if (blob2.length > 0) {
3140                                 size_t len;
3141
3142                                 len = utf16_len_n(blob1.data,
3143                                                   blob1.length);
3144                                 blob1.length = len;
3145
3146                                 ok = convert_string_talloc(state,
3147                                                            CH_UTF16LE,
3148                                                            CH_UNIX,
3149                                                            blob2.data,
3150                                                            blob2.length,
3151                                                            &server_name,
3152                                                            &len);
3153                                 if (!ok) {
3154                                         status = map_nt_error_from_unix_common(errno);
3155                                         tevent_req_nterror(req, status);
3156                                         return;
3157                                 }
3158                         }
3159                 }
3160
3161                 client_signing = "disabled";
3162                 if (conn->allow_signing) {
3163                         client_signing = "allowed";
3164                 }
3165                 if (conn->mandatory_signing) {
3166                         client_signing = "required";
3167                 }
3168
3169                 server_signing = "not supported";
3170                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
3171                         server_signing = "supported";
3172                         server_allowed = true;
3173                 }
3174                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
3175                         server_signing = "required";
3176                         server_mandatory = true;
3177                 }
3178
3179                 ok = smb_signing_set_negotiated(conn->smb1.signing,
3180                                                 server_allowed,
3181                                                 server_mandatory);
3182                 if (!ok) {
3183                         DEBUG(1,("cli_negprot: SMB signing is required, "
3184                                  "but client[%s] and server[%s] mismatch\n",
3185                                  client_signing, server_signing));
3186                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3187                         return;
3188                 }
3189
3190         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
3191                 DATA_BLOB blob1;
3192                 uint8_t key_len;
3193                 time_t t;
3194
3195                 if (wct != 0x0D) {
3196                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3197                         return;
3198                 }
3199
3200                 server_security_mode = SVAL(vwv + 1, 0);
3201                 server_max_xmit = SVAL(vwv + 2, 0);
3202                 server_max_mux = SVAL(vwv + 3, 0);
3203                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
3204                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
3205                 server_session_key = IVAL(vwv + 6, 0);
3206                 server_time_zone = SVALS(vwv + 10, 0);
3207                 server_time_zone *= 60;
3208                 /* this time is converted to GMT by make_unix_date */
3209                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
3210                 unix_to_nt_time(&server_system_time, t);
3211                 key_len = SVAL(vwv + 11, 0);
3212
3213                 if (num_bytes < key_len) {
3214                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3215                         return;
3216                 }
3217
3218                 if (key_len != 0 && key_len != 8) {
3219                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3220                         return;
3221                 }
3222
3223                 if (key_len == 8) {
3224                         memcpy(server_challenge, bytes, 8);
3225                 }
3226
3227                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3228                 if (blob1.length > 0) {
3229                         size_t len;
3230                         bool ok;
3231
3232                         len = utf16_len_n(blob1.data,
3233                                           blob1.length);
3234                         blob1.length = len;
3235
3236                         ok = convert_string_talloc(state,
3237                                                    CH_DOS,
3238                                                    CH_UNIX,
3239                                                    blob1.data,
3240                                                    blob1.length,
3241                                                    &server_workgroup,
3242                                                    &len);
3243                         if (!ok) {
3244                                 status = map_nt_error_from_unix_common(errno);
3245                                 tevent_req_nterror(req, status);
3246                                 return;
3247                         }
3248                 }
3249
3250         } else {
3251                 /* the old core protocol */
3252                 server_time_zone = get_time_zone(time(NULL));
3253                 server_max_xmit = 1024;
3254                 server_max_mux = 1;
3255         }
3256
3257         if (server_max_xmit < 1024) {
3258                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3259                 return;
3260         }
3261
3262         if (server_max_mux < 1) {
3263                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3264                 return;
3265         }
3266
3267         /*
3268          * Now calculate the negotiated capabilities
3269          * based on the mask for:
3270          * - client only flags
3271          * - flags used in both directions
3272          * - server only flags
3273          */
3274         both_capabilities = client_capabilities & server_capabilities;
3275         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
3276         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
3277         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
3278
3279         max_xmit = MIN(client_max_xmit, server_max_xmit);
3280
3281         conn->smb1.server.capabilities = server_capabilities;
3282         conn->smb1.capabilities = capabilities;
3283
3284         conn->smb1.server.max_xmit = server_max_xmit;
3285         conn->smb1.max_xmit = max_xmit;
3286
3287         conn->smb1.server.max_mux = server_max_mux;
3288
3289         conn->smb1.server.security_mode = server_security_mode;
3290
3291         conn->smb1.server.readbraw = server_readbraw;
3292         conn->smb1.server.writebraw = server_writebraw;
3293         conn->smb1.server.lockread = server_lockread;
3294         conn->smb1.server.writeunlock = server_writeunlock;
3295
3296         conn->smb1.server.session_key = server_session_key;
3297
3298         talloc_steal(conn, server_gss_blob.data);
3299         conn->smb1.server.gss_blob = server_gss_blob;
3300         conn->smb1.server.guid = server_guid;
3301         memcpy(conn->smb1.server.challenge, server_challenge, 8);
3302         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
3303         conn->smb1.server.name = talloc_move(conn, &server_name);
3304
3305         conn->smb1.server.time_zone = server_time_zone;
3306         conn->smb1.server.system_time = server_system_time;
3307
3308         tevent_req_done(req);
3309 }
3310
3311 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
3312 {
3313         size_t i;
3314         uint8_t *buf;
3315         uint16_t dialect_count = 0;
3316
3317         buf = state->smb2.dyn;
3318         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3319                 if (smb2cli_prots[i].proto < state->min_protocol) {
3320                         continue;
3321                 }
3322
3323                 if (smb2cli_prots[i].proto > state->max_protocol) {
3324                         continue;
3325                 }
3326
3327                 SSVAL(buf, dialect_count*2, smb2cli_prots[i].smb2_dialect);
3328                 dialect_count++;
3329         }
3330
3331         buf = state->smb2.fixed;
3332         SSVAL(buf, 0, 36);
3333         SSVAL(buf, 2, dialect_count);
3334         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
3335         SSVAL(buf, 6, 0);       /* Reserved */
3336         SSVAL(buf, 8, 0);       /* Capabilities */
3337         if (state->max_protocol >= PROTOCOL_SMB2_10) {
3338                 NTSTATUS status;
3339                 DATA_BLOB blob;
3340
3341                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
3342                                           state, &blob);
3343                 if (!NT_STATUS_IS_OK(status)) {
3344                         return NULL;
3345                 }
3346                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
3347         } else {
3348                 memset(buf+12, 0, 16);  /* ClientGuid */
3349         }
3350         SBVAL(buf, 28, 0);      /* ClientStartTime */
3351
3352         return smb2cli_req_send(state, state->ev,
3353                                 state->conn, SMB2_OP_NEGPROT,
3354                                 0, 0, /* flags */
3355                                 state->timeout_msec,
3356                                 0xFEFF, 0, NULL, /* pid, tid, session */
3357                                 state->smb2.fixed, sizeof(state->smb2.fixed),
3358                                 state->smb2.dyn, dialect_count*2);
3359 }
3360
3361 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
3362 {
3363         struct tevent_req *req =
3364                 tevent_req_callback_data(subreq,
3365                 struct tevent_req);
3366         struct smbXcli_negprot_state *state =
3367                 tevent_req_data(req,
3368                 struct smbXcli_negprot_state);
3369         struct smbXcli_conn *conn = state->conn;
3370         size_t security_offset, security_length;
3371         DATA_BLOB blob;
3372         NTSTATUS status;
3373         struct iovec *iov;
3374         uint8_t *body;
3375         size_t i;
3376         uint16_t dialect_revision;
3377         static const struct smb2cli_req_expected_response expected[] = {
3378         {
3379                 .status = NT_STATUS_OK,
3380                 .body_size = 0x41
3381         }
3382         };
3383
3384         status = smb2cli_req_recv(subreq, state, &iov,
3385                                   expected, ARRAY_SIZE(expected));
3386         TALLOC_FREE(subreq);
3387         if (tevent_req_nterror(req, status)) {
3388                 return;
3389         }
3390
3391         body = (uint8_t *)iov[1].iov_base;
3392
3393         dialect_revision = SVAL(body, 4);
3394
3395         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3396                 if (smb2cli_prots[i].proto < state->min_protocol) {
3397                         continue;
3398                 }
3399
3400                 if (smb2cli_prots[i].proto > state->max_protocol) {
3401                         continue;
3402                 }
3403
3404                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
3405                         continue;
3406                 }
3407
3408                 conn->protocol = smb2cli_prots[i].proto;
3409                 break;
3410         }
3411
3412         if (conn->protocol == PROTOCOL_NONE) {
3413                 if (state->min_protocol >= PROTOCOL_SMB2_02) {
3414                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3415                         return;
3416                 }
3417
3418                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
3419                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3420                         return;
3421                 }
3422
3423                 /* make sure we do not loop forever */
3424                 state->min_protocol = PROTOCOL_SMB2_02;
3425
3426                 /*
3427                  * send a SMB2 negprot, in order to negotiate
3428                  * the SMB2 dialect. This needs to use the
3429                  * message id 1.
3430                  */
3431                 state->conn->smb2.mid = 1;
3432                 subreq = smbXcli_negprot_smb2_subreq(state);
3433                 if (tevent_req_nomem(subreq, req)) {
3434                         return;
3435                 }
3436                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3437                 return;
3438         }
3439
3440         conn->smb2.server.security_mode = SVAL(body, 2);
3441
3442         blob = data_blob_const(body + 8, 16);
3443         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
3444         if (tevent_req_nterror(req, status)) {
3445                 return;
3446         }
3447
3448         conn->smb2.server.capabilities  = IVAL(body, 24);
3449         conn->smb2.server.max_trans_size= IVAL(body, 28);
3450         conn->smb2.server.max_read_size = IVAL(body, 32);
3451         conn->smb2.server.max_write_size= IVAL(body, 36);
3452         conn->smb2.server.system_time   = BVAL(body, 40);
3453         conn->smb2.server.start_time    = BVAL(body, 48);
3454
3455         security_offset = SVAL(body, 56);
3456         security_length = SVAL(body, 58);
3457
3458         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
3459                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3460                 return;
3461         }
3462
3463         if (security_length > iov[2].iov_len) {
3464                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3465                 return;
3466         }
3467
3468         conn->smb2.server.gss_blob = data_blob_talloc(conn,
3469                                                 iov[2].iov_base,
3470                                                 security_length);
3471         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
3472                 return;
3473         }
3474
3475         tevent_req_done(req);
3476 }
3477
3478 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3479                                                   TALLOC_CTX *tmp_mem,
3480                                                   uint8_t *inbuf)
3481 {
3482         size_t num_pending = talloc_array_length(conn->pending);
3483         struct tevent_req *subreq;
3484         struct smbXcli_req_state *substate;
3485         struct tevent_req *req;
3486         struct smbXcli_negprot_state *state;
3487         uint32_t protocol_magic = IVAL(inbuf, 4);
3488
3489         if (num_pending != 1) {
3490                 return NT_STATUS_INTERNAL_ERROR;
3491         }
3492
3493         subreq = conn->pending[0];
3494         substate = tevent_req_data(subreq, struct smbXcli_req_state);
3495         req = tevent_req_callback_data(subreq, struct tevent_req);
3496         state = tevent_req_data(req, struct smbXcli_negprot_state);
3497
3498         switch (protocol_magic) {
3499         case SMB_MAGIC:
3500                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3501                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3502                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3503
3504         case SMB2_MAGIC:
3505                 if (substate->smb2.recv_iov == NULL) {
3506                         /*
3507                          * For the SMB1 negprot we have move it.
3508                          */
3509                         substate->smb2.recv_iov = substate->smb1.recv_iov;
3510                         substate->smb1.recv_iov = NULL;
3511                 }
3512
3513                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3514                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3515                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3516         }
3517
3518         DEBUG(10, ("Got non-SMB PDU\n"));
3519         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3520 }
3521
3522 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
3523 {
3524         return tevent_req_simple_recv_ntstatus(req);
3525 }
3526
3527 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
3528                          uint32_t timeout_msec,
3529                          enum protocol_types min_protocol,
3530                          enum protocol_types max_protocol)
3531 {
3532         TALLOC_CTX *frame = talloc_stackframe();
3533         struct tevent_context *ev;
3534         struct tevent_req *req;
3535         NTSTATUS status = NT_STATUS_NO_MEMORY;
3536         bool ok;
3537
3538         if (smbXcli_conn_has_async_calls(conn)) {
3539                 /*
3540                  * Can't use sync call while an async call is in flight
3541                  */
3542                 status = NT_STATUS_INVALID_PARAMETER_MIX;
3543                 goto fail;
3544         }
3545         ev = tevent_context_init(frame);
3546         if (ev == NULL) {
3547                 goto fail;
3548         }
3549         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
3550                                    min_protocol, max_protocol);
3551         if (req == NULL) {
3552                 goto fail;
3553         }
3554         ok = tevent_req_poll(req, ev);
3555         if (!ok) {
3556                 status = map_nt_error_from_unix_common(errno);
3557                 goto fail;
3558         }
3559         status = smbXcli_negprot_recv(req);
3560  fail:
3561         TALLOC_FREE(frame);
3562         return status;
3563 }
3564
3565 static int smbXcli_session_destructor(struct smbXcli_session *session)
3566 {
3567         if (session->conn == NULL) {
3568                 return 0;
3569         }
3570
3571         DLIST_REMOVE(session->conn->sessions, session);
3572         return 0;
3573 }
3574
3575 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
3576                                                struct smbXcli_conn *conn)
3577 {
3578         struct smbXcli_session *session;
3579
3580         session = talloc_zero(mem_ctx, struct smbXcli_session);
3581         if (session == NULL) {
3582                 return NULL;
3583         }
3584         talloc_set_destructor(session, smbXcli_session_destructor);
3585
3586         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
3587         session->conn = conn;
3588
3589         return session;
3590 }
3591
3592 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
3593 {
3594         struct smbXcli_conn *conn = session->conn;
3595         uint8_t security_mode = 0;
3596
3597         if (conn == NULL) {
3598                 return security_mode;
3599         }
3600
3601         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
3602         if (conn->mandatory_signing) {
3603                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
3604         }
3605
3606         return security_mode;
3607 }
3608
3609 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
3610 {
3611         return session->smb2.session_id;
3612 }
3613
3614 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
3615                                       uint64_t session_id,
3616                                       uint16_t session_flags)
3617 {
3618         session->smb2.session_id = session_id;
3619         session->smb2.session_flags = session_flags;
3620 }
3621
3622 NTSTATUS smb2cli_session_update_session_key(struct smbXcli_session *session,
3623                                             const DATA_BLOB session_key,
3624                                             const struct iovec *recv_iov)
3625 {
3626         struct smbXcli_conn *conn = session->conn;
3627         uint16_t no_sign_flags;
3628         DATA_BLOB signing_key;
3629         NTSTATUS status;
3630
3631         if (conn == NULL) {
3632                 return NT_STATUS_INVALID_PARAMETER_MIX;
3633         }
3634
3635         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
3636
3637         if (session->smb2.session_flags & no_sign_flags) {
3638                 session->smb2.should_sign = false;
3639                 return NT_STATUS_OK;
3640         }
3641
3642         if (session->smb2.signing_key.length > 0) {
3643                 signing_key = session->smb2.signing_key;
3644         } else {
3645                 signing_key = session_key;
3646         }
3647
3648         status = smb2_signing_check_pdu(signing_key, recv_iov, 3);
3649         if (!NT_STATUS_IS_OK(status)) {
3650                 return status;
3651         }
3652
3653         session->smb2.session_key = data_blob_dup_talloc(session, session_key);
3654         if (session->smb2.session_key.data == NULL) {
3655                 return NT_STATUS_NO_MEMORY;
3656         }
3657
3658         if (session->smb2.signing_key.length > 0) {
3659                 return NT_STATUS_OK;
3660         }
3661
3662         session->smb2.signing_key = data_blob_dup_talloc(session, signing_key);
3663         if (session->smb2.signing_key.data == NULL) {
3664                 return NT_STATUS_NO_MEMORY;
3665         }
3666
3667         session->smb2.should_sign = false;
3668
3669         if (conn->desire_signing) {
3670                 session->smb2.should_sign = true;
3671         }
3672
3673         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
3674                 session->smb2.should_sign = true;
3675         }
3676
3677         return NT_STATUS_OK;
3678 }