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                 bool channel_setup;
 137         } smb2;
 138 };
 139
 140 struct smbXcli_req_state {
 141         struct tevent_context *ev;
 142         struct smbXcli_conn *conn;
 143         struct smbXcli_session *session; /* maybe NULL */
 144
 145         uint8_t length_hdr[4];
 146
 147         bool one_way;
 148
 149         uint8_t *inbuf;
 150
 151         struct {
 152                 /* Space for the header including the wct */
 153                 uint8_t hdr[HDR_VWV];
 154
 155                 /*
 156                  * For normal requests, smb1cli_req_send chooses a mid.
 157                  * SecondaryV trans requests need to use the mid of the primary
 158                  * request, so we need a place to store it.
 159                  * Assume it is set if != 0.
 160                  */
 161                 uint16_t mid;
 162
 163                 uint16_t *vwv;
 164                 uint8_t bytecount_buf[2];
 165
 166 #define MAX_SMB_IOV 5
 167                 /* length_hdr, hdr, words, byte_count, buffers */
 168                 struct iovec iov[1 + 3 + MAX_SMB_IOV];
 169                 int iov_count;
 170
 171                 uint32_t seqnum;
 172                 struct tevent_req **chained_requests;
 173
 174                 uint8_t recv_cmd;
 175                 NTSTATUS recv_status;
 176                 /* always an array of 3 talloc elements */
 177                 struct iovec *recv_iov;
 178         } smb1;
 179
 180         struct {
 181                 const uint8_t *fixed;
 182                 uint16_t fixed_len;
 183                 const uint8_t *dyn;
 184                 uint32_t dyn_len;
 185
 186                 uint8_t hdr[64];
 187                 uint8_t pad[7]; /* padding space for compounding */
 188
 189                 /* always an array of 3 talloc elements */
 190                 struct iovec *recv_iov;
 191
 192                 uint16_t credit_charge;
 193
 194                 bool signing_skipped;
 195         } smb2;
 196 };
 197
 198 static int smbXcli_conn_destructor(struct smbXcli_conn *conn)
 199 {
 200         /*
 201          * NT_STATUS_OK, means we do not notify the callers
 202          */
 203         smbXcli_conn_disconnect(conn, NT_STATUS_OK);
 204
 205         while (conn->sessions) {
 206                 conn->sessions->conn = NULL;
 207                 DLIST_REMOVE(conn->sessions, conn->sessions);
 208         }
 209
 210         if (conn->smb1.trans_enc) {
 211                 common_free_encryption_state(&conn->smb1.trans_enc);
 212         }
 213
 214         return 0;
 215 }
 216
 217 struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 218                                          int fd,
 219                                          const char *remote_name,
 220                                          enum smb_signing_setting signing_state,
 221                                          uint32_t smb1_capabilities,
 222                                          struct GUID *client_guid)
 223 {
 224         struct smbXcli_conn *conn = NULL;
 225         void *ss = NULL;
 226         struct sockaddr *sa = NULL;
 227         socklen_t sa_length;
 228         int ret;
 229
 230         conn = talloc_zero(mem_ctx, struct smbXcli_conn);
 231         if (!conn) {
 232                 return NULL;
 233         }
 234
 235         conn->remote_name = talloc_strdup(conn, remote_name);
 236         if (conn->remote_name == NULL) {
 237                 goto error;
 238         }
 239
 240         conn->fd = fd;
 241
 242         ss = (void *)&conn->local_ss;
 243         sa = (struct sockaddr *)ss;
 244         sa_length = sizeof(conn->local_ss);
 245         ret = getsockname(fd, sa, &sa_length);
 246         if (ret == -1) {
 247                 goto error;
 248         }
 249         ss = (void *)&conn->remote_ss;
 250         sa = (struct sockaddr *)ss;
 251         sa_length = sizeof(conn->remote_ss);
 252         ret = getpeername(fd, sa, &sa_length);
 253         if (ret == -1) {
 254                 goto error;
 255         }
 256
 257         conn->outgoing = tevent_queue_create(conn, "smbXcli_outgoing");
 258         if (conn->outgoing == NULL) {
 259                 goto error;
 260         }
 261         conn->pending = NULL;
 262
 263         conn->protocol = PROTOCOL_NONE;
 264
 265         switch (signing_state) {
 266         case SMB_SIGNING_OFF:
 267                 /* never */
 268                 conn->allow_signing = false;
 269                 conn->desire_signing = false;
 270                 conn->mandatory_signing = false;
 271                 break;
 272         case SMB_SIGNING_DEFAULT:
 273         case SMB_SIGNING_IF_REQUIRED:
 274                 /* if the server requires it */
 275                 conn->allow_signing = true;
 276                 conn->desire_signing = false;
 277                 conn->mandatory_signing = false;
 278                 break;
 279         case SMB_SIGNING_REQUIRED:
 280                 /* always */
 281                 conn->allow_signing = true;
 282                 conn->desire_signing = true;
 283                 conn->mandatory_signing = true;
 284                 break;
 285         }
 286
 287         conn->smb1.client.capabilities = smb1_capabilities;
 288         conn->smb1.client.max_xmit = UINT16_MAX;
 289
 290         conn->smb1.capabilities = conn->smb1.client.capabilities;
 291         conn->smb1.max_xmit = 1024;
 292
 293         conn->smb1.mid = 1;
 294
 295         /* initialise signing */
 296         conn->smb1.signing = smb_signing_init(conn,
 297                                               conn->allow_signing,
 298                                               conn->desire_signing,
 299                                               conn->mandatory_signing);
 300         if (!conn->smb1.signing) {
 301                 goto error;
 302         }
 303
 304         conn->smb2.client.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 305         if (conn->mandatory_signing) {
 306                 conn->smb2.client.security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
 307         }
 308         if (client_guid) {
 309                 conn->smb2.client.guid = *client_guid;
 310         }
 311
 312         conn->smb2.cur_credits = 1;
 313         conn->smb2.max_credits = 0;
 314
 315         talloc_set_destructor(conn, smbXcli_conn_destructor);
 316         return conn;
 317
 318  error:
 319         TALLOC_FREE(conn);
 320         return NULL;
 321 }
 322
 323 bool smbXcli_conn_is_connected(struct smbXcli_conn *conn)
 324 {
 325         if (conn == NULL) {
 326                 return false;
 327         }
 328
 329         if (conn->fd == -1) {
 330                 return false;
 331         }
 332
 333         return true;
 334 }
 335
 336 enum protocol_types smbXcli_conn_protocol(struct smbXcli_conn *conn)
 337 {
 338         return conn->protocol;
 339 }
 340
 341 bool smbXcli_conn_use_unicode(struct smbXcli_conn *conn)
 342 {
 343         if (conn->protocol >= PROTOCOL_SMB2_02) {
 344                 return true;
 345         }
 346
 347         if (conn->smb1.capabilities & CAP_UNICODE) {
 348                 return true;
 349         }
 350
 351         return false;
 352 }
 353
 354 void smbXcli_conn_set_sockopt(struct smbXcli_conn *conn, const char *options)
 355 {
 356         set_socket_options(conn->fd, options);
 357 }
 358
 359 const struct sockaddr_storage *smbXcli_conn_local_sockaddr(struct smbXcli_conn *conn)
 360 {
 361         return &conn->local_ss;
 362 }
 363
 364 const struct sockaddr_storage *smbXcli_conn_remote_sockaddr(struct smbXcli_conn *conn)
 365 {
 366         return &conn->remote_ss;
 367 }
 368
 369 const char *smbXcli_conn_remote_name(struct smbXcli_conn *conn)
 370 {
 371         return conn->remote_name;
 372 }
 373
 374 uint16_t smbXcli_conn_max_requests(struct smbXcli_conn *conn)
 375 {
 376         if (conn->protocol >= PROTOCOL_SMB2_02) {
 377                 /*
 378                  * TODO...
 379                  */
 380                 return 1;
 381         }
 382
 383         return conn->smb1.server.max_mux;
 384 }
 385
 386 NTTIME smbXcli_conn_server_system_time(struct smbXcli_conn *conn)
 387 {
 388         if (conn->protocol >= PROTOCOL_SMB2_02) {
 389                 return conn->smb2.server.system_time;
 390         }
 391
 392         return conn->smb1.server.system_time;
 393 }
 394
 395 const DATA_BLOB *smbXcli_conn_server_gss_blob(struct smbXcli_conn *conn)
 396 {
 397         if (conn->protocol >= PROTOCOL_SMB2_02) {
 398                 return &conn->smb2.server.gss_blob;
 399         }
 400
 401         return &conn->smb1.server.gss_blob;
 402 }
 403
 404 const struct GUID *smbXcli_conn_server_guid(struct smbXcli_conn *conn)
 405 {
 406         if (conn->protocol >= PROTOCOL_SMB2_02) {
 407                 return &conn->smb2.server.guid;
 408         }
 409
 410         return &conn->smb1.server.guid;
 411 }
 412
 413 uint32_t smb1cli_conn_capabilities(struct smbXcli_conn *conn)
 414 {
 415         return conn->smb1.capabilities;
 416 }
 417
 418 uint32_t smb1cli_conn_max_xmit(struct smbXcli_conn *conn)
 419 {
 420         return conn->smb1.max_xmit;
 421 }
 422
 423 uint32_t smb1cli_conn_server_session_key(struct smbXcli_conn *conn)
 424 {
 425         return conn->smb1.server.session_key;
 426 }
 427
 428 const uint8_t *smb1cli_conn_server_challenge(struct smbXcli_conn *conn)
 429 {
 430         return conn->smb1.server.challenge;
 431 }
 432
 433 uint16_t smb1cli_conn_server_security_mode(struct smbXcli_conn *conn)
 434 {
 435         return conn->smb1.server.security_mode;
 436 }
 437
 438 int smb1cli_conn_server_time_zone(struct smbXcli_conn *conn)
 439 {
 440         return conn->smb1.server.time_zone;
 441 }
 442
 443 bool smb1cli_conn_activate_signing(struct smbXcli_conn *conn,
 444                                    const DATA_BLOB user_session_key,
 445                                    const DATA_BLOB response)
 446 {
 447         return smb_signing_activate(conn->smb1.signing,
 448                                     user_session_key,
 449                                     response);
 450 }
 451
 452 bool smb1cli_conn_check_signing(struct smbXcli_conn *conn,
 453                                 const uint8_t *buf, uint32_t seqnum)
 454 {
 455         return smb_signing_check_pdu(conn->smb1.signing, buf, seqnum);
 456 }
 457
 458 bool smb1cli_conn_signing_is_active(struct smbXcli_conn *conn)
 459 {
 460         return smb_signing_is_active(conn->smb1.signing);
 461 }
 462
 463 void smb1cli_conn_set_encryption(struct smbXcli_conn *conn,
 464                                  struct smb_trans_enc_state *es)
 465 {
 466         /* Replace the old state, if any. */
 467         if (conn->smb1.trans_enc) {
 468                 common_free_encryption_state(&conn->smb1.trans_enc);
 469         }
 470         conn->smb1.trans_enc = es;
 471 }
 472
 473 bool smb1cli_conn_encryption_on(struct smbXcli_conn *conn)
 474 {
 475         return common_encryption_on(conn->smb1.trans_enc);
 476 }
 477
 478
 479 static NTSTATUS smb1cli_pull_raw_error(const uint8_t *hdr)
 480 {
 481         uint32_t flags2 = SVAL(hdr, HDR_FLG2);
 482         NTSTATUS status = NT_STATUS(IVAL(hdr, HDR_RCLS));
 483
 484         if (NT_STATUS_IS_OK(status)) {
 485                 return NT_STATUS_OK;
 486         }
 487
 488         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
 489                 return status;
 490         }
 491
 492         return NT_STATUS_DOS(CVAL(hdr, HDR_RCLS), SVAL(hdr, HDR_ERR));
 493 }
 494
 495 /**
 496  * Is the SMB command able to hold an AND_X successor
 497  * @param[in] cmd       The SMB command in question
 498  * @retval Can we add a chained request after "cmd"?
 499  */
 500 bool smb1cli_is_andx_req(uint8_t cmd)
 501 {
 502         switch (cmd) {
 503         case SMBtconX:
 504         case SMBlockingX:
 505         case SMBopenX:
 506         case SMBreadX:
 507         case SMBwriteX:
 508         case SMBsesssetupX:
 509         case SMBulogoffX:
 510         case SMBntcreateX:
 511                 return true;
 512                 break;
 513         default:
 514                 break;
 515         }
 516
 517         return false;
 518 }
 519
 520 static uint16_t smb1cli_alloc_mid(struct smbXcli_conn *conn)
 521 {
 522         size_t num_pending = talloc_array_length(conn->pending);
 523         uint16_t result;
 524
 525         while (true) {
 526                 size_t i;
 527
 528                 result = conn->smb1.mid++;
 529                 if ((result == 0) || (result == 0xffff)) {
 530                         continue;
 531                 }
 532
 533                 for (i=0; i<num_pending; i++) {
 534                         if (result == smb1cli_req_mid(conn->pending[i])) {
 535                                 break;
 536                         }
 537                 }
 538
 539                 if (i == num_pending) {
 540                         return result;
 541                 }
 542         }
 543 }
 544
 545 void smbXcli_req_unset_pending(struct tevent_req *req)
 546 {
 547         struct smbXcli_req_state *state =
 548                 tevent_req_data(req,
 549                 struct smbXcli_req_state);
 550         struct smbXcli_conn *conn = state->conn;
 551         size_t num_pending = talloc_array_length(conn->pending);
 552         size_t i;
 553
 554         if (state->smb1.mid != 0) {
 555                 /*
 556                  * This is a [nt]trans[2] request which waits
 557                  * for more than one reply.
 558                  */
 559                 return;
 560         }
 561
 562         talloc_set_destructor(req, NULL);
 563
 564         if (num_pending == 1) {
 565                 /*
 566                  * The pending read_smb tevent_req is a child of
 567                  * conn->pending. So if nothing is pending anymore, we need to
 568                  * delete the socket read fde.
 569                  */
 570                 TALLOC_FREE(conn->pending);
 571                 conn->read_smb_req = NULL;
 572                 return;
 573         }
 574
 575         for (i=0; i<num_pending; i++) {
 576                 if (req == conn->pending[i]) {
 577                         break;
 578                 }
 579         }
 580         if (i == num_pending) {
 581                 /*
 582                  * Something's seriously broken. Just returning here is the
 583                  * right thing nevertheless, the point of this routine is to
 584                  * remove ourselves from conn->pending.
 585                  */
 586                 return;
 587         }
 588
 589         /*
 590          * Remove ourselves from the conn->pending array
 591          */
 592         for (; i < (num_pending - 1); i++) {
 593                 conn->pending[i] = conn->pending[i+1];
 594         }
 595
 596         /*
 597          * No NULL check here, we're shrinking by sizeof(void *), and
 598          * talloc_realloc just adjusts the size for this.
 599          */
 600         conn->pending = talloc_realloc(NULL, conn->pending, struct tevent_req *,
 601                                        num_pending - 1);
 602         return;
 603 }
 604
 605 static int smbXcli_req_destructor(struct tevent_req *req)
 606 {
 607         struct smbXcli_req_state *state =
 608                 tevent_req_data(req,
 609                 struct smbXcli_req_state);
 610
 611         /*
 612          * Make sure we really remove it from
 613          * the pending array on destruction.
 614          */
 615         state->smb1.mid = 0;
 616         smbXcli_req_unset_pending(req);
 617         return 0;
 618 }
 619
 620 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn);
 621
 622 bool smbXcli_req_set_pending(struct tevent_req *req)
 623 {
 624         struct smbXcli_req_state *state =
 625                 tevent_req_data(req,
 626                 struct smbXcli_req_state);
 627         struct smbXcli_conn *conn;
 628         struct tevent_req **pending;
 629         size_t num_pending;
 630
 631         conn = state->conn;
 632
 633         if (!smbXcli_conn_is_connected(conn)) {
 634                 return false;
 635         }
 636
 637         num_pending = talloc_array_length(conn->pending);
 638
 639         pending = talloc_realloc(conn, conn->pending, struct tevent_req *,
 640                                  num_pending+1);
 641         if (pending == NULL) {
 642                 return false;
 643         }
 644         pending[num_pending] = req;
 645         conn->pending = pending;
 646         talloc_set_destructor(req, smbXcli_req_destructor);
 647
 648         if (!smbXcli_conn_receive_next(conn)) {
 649                 /*
 650                  * the caller should notify the current request
 651                  *
 652                  * And all other pending requests get notified
 653                  * by smbXcli_conn_disconnect().
 654                  */
 655                 smbXcli_req_unset_pending(req);
 656                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
 657                 return false;
 658         }
 659
 660         return true;
 661 }
 662
 663 static void smbXcli_conn_received(struct tevent_req *subreq);
 664
 665 static bool smbXcli_conn_receive_next(struct smbXcli_conn *conn)
 666 {
 667         size_t num_pending = talloc_array_length(conn->pending);
 668         struct tevent_req *req;
 669         struct smbXcli_req_state *state;
 670
 671         if (conn->read_smb_req != NULL) {
 672                 return true;
 673         }
 674
 675         if (num_pending == 0) {
 676                 if (conn->smb2.mid < UINT64_MAX) {
 677                         /* no more pending requests, so we are done for now */
 678                         return true;
 679                 }
 680
 681                 /*
 682                  * If there are no more SMB2 requests possible,
 683                  * because we are out of message ids,
 684                  * we need to disconnect.
 685                  */
 686                 smbXcli_conn_disconnect(conn, NT_STATUS_CONNECTION_ABORTED);
 687                 return true;
 688         }
 689
 690         req = conn->pending[0];
 691         state = tevent_req_data(req, struct smbXcli_req_state);
 692
 693         /*
 694          * We're the first ones, add the read_smb request that waits for the
 695          * answer from the server
 696          */
 697         conn->read_smb_req = read_smb_send(conn->pending, state->ev, conn->fd);
 698         if (conn->read_smb_req == NULL) {
 699                 return false;
 700         }
 701         tevent_req_set_callback(conn->read_smb_req, smbXcli_conn_received, conn);
 702         return true;
 703 }
 704
 705 void smbXcli_conn_disconnect(struct smbXcli_conn *conn, NTSTATUS status)
 706 {
 707         if (conn->fd != -1) {
 708                 close(conn->fd);
 709         }
 710         conn->fd = -1;
 711
 712         /*
 713          * Cancel all pending requests. We do not do a for-loop walking
 714          * conn->pending because that array changes in
 715          * smbXcli_req_unset_pending.
 716          */
 717         while (talloc_array_length(conn->pending) > 0) {
 718                 struct tevent_req *req;
 719                 struct smbXcli_req_state *state;
 720                 struct tevent_req **chain;
 721                 size_t num_chained;
 722                 size_t i;
 723
 724                 req = conn->pending[0];
 725                 state = tevent_req_data(req, struct smbXcli_req_state);
 726
 727                 if (state->smb1.chained_requests == NULL) {
 728                         /*
 729                          * We're dead. No point waiting for trans2
 730                          * replies.
 731                          */
 732                         state->smb1.mid = 0;
 733
 734                         smbXcli_req_unset_pending(req);
 735
 736                         if (NT_STATUS_IS_OK(status)) {
 737                                 /* do not notify the callers */
 738                                 continue;
 739                         }
 740
 741                         /*
 742                          * we need to defer the callback, because we may notify
 743                          * more then one caller.
 744                          */
 745                         tevent_req_defer_callback(req, state->ev);
 746                         tevent_req_nterror(req, status);
 747                         continue;
 748                 }
 749
 750                 chain = talloc_move(conn, &state->smb1.chained_requests);
 751                 num_chained = talloc_array_length(chain);
 752
 753                 for (i=0; i<num_chained; i++) {
 754                         req = chain[i];
 755                         state = tevent_req_data(req, struct smbXcli_req_state);
 756
 757                         /*
 758                          * We're dead. No point waiting for trans2
 759                          * replies.
 760                          */
 761                         state->smb1.mid = 0;
 762
 763                         smbXcli_req_unset_pending(req);
 764
 765                         if (NT_STATUS_IS_OK(status)) {
 766                                 /* do not notify the callers */
 767                                 continue;
 768                         }
 769
 770                         /*
 771                          * we need to defer the callback, because we may notify
 772                          * more then one caller.
 773                          */
 774                         tevent_req_defer_callback(req, state->ev);
 775                         tevent_req_nterror(req, status);
 776                 }
 777                 TALLOC_FREE(chain);
 778         }
 779 }
 780
 781 /*
 782  * Fetch a smb request's mid. Only valid after the request has been sent by
 783  * smb1cli_req_send().
 784  */
 785 uint16_t smb1cli_req_mid(struct tevent_req *req)
 786 {
 787         struct smbXcli_req_state *state =
 788                 tevent_req_data(req,
 789                 struct smbXcli_req_state);
 790
 791         if (state->smb1.mid != 0) {
 792                 return state->smb1.mid;
 793         }
 794
 795         return SVAL(state->smb1.hdr, HDR_MID);
 796 }
 797
 798 void smb1cli_req_set_mid(struct tevent_req *req, uint16_t mid)
 799 {
 800         struct smbXcli_req_state *state =
 801                 tevent_req_data(req,
 802                 struct smbXcli_req_state);
 803
 804         state->smb1.mid = mid;
 805 }
 806
 807 uint32_t smb1cli_req_seqnum(struct tevent_req *req)
 808 {
 809         struct smbXcli_req_state *state =
 810                 tevent_req_data(req,
 811                 struct smbXcli_req_state);
 812
 813         return state->smb1.seqnum;
 814 }
 815
 816 void smb1cli_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
 817 {
 818         struct smbXcli_req_state *state =
 819                 tevent_req_data(req,
 820                 struct smbXcli_req_state);
 821
 822         state->smb1.seqnum = seqnum;
 823 }
 824
 825 static size_t smbXcli_iov_len(const struct iovec *iov, int count)
 826 {
 827         size_t result = 0;
 828         int i;
 829         for (i=0; i<count; i++) {
 830                 result += iov[i].iov_len;
 831         }
 832         return result;
 833 }
 834
 835 static uint8_t *smbXcli_iov_concat(TALLOC_CTX *mem_ctx,
 836                                    const struct iovec *iov,
 837                                    int count)
 838 {
 839         size_t len = smbXcli_iov_len(iov, count);
 840         size_t copied;
 841         uint8_t *buf;
 842         int i;
 843
 844         buf = talloc_array(mem_ctx, uint8_t, len);
 845         if (buf == NULL) {
 846                 return NULL;
 847         }
 848         copied = 0;
 849         for (i=0; i<count; i++) {
 850                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
 851                 copied += iov[i].iov_len;
 852         }
 853         return buf;
 854 }
 855
 856 static void smb1cli_req_flags(enum protocol_types protocol,
 857                               uint32_t smb1_capabilities,
 858                               uint8_t smb_command,
 859                               uint8_t additional_flags,
 860                               uint8_t clear_flags,
 861                               uint8_t *_flags,
 862                               uint16_t additional_flags2,
 863                               uint16_t clear_flags2,
 864                               uint16_t *_flags2)
 865 {
 866         uint8_t flags = 0;
 867         uint16_t flags2 = 0;
 868
 869         if (protocol >= PROTOCOL_LANMAN1) {
 870                 flags |= FLAG_CASELESS_PATHNAMES;
 871                 flags |= FLAG_CANONICAL_PATHNAMES;
 872         }
 873
 874         if (protocol >= PROTOCOL_LANMAN2) {
 875                 flags2 |= FLAGS2_LONG_PATH_COMPONENTS;
 876                 flags2 |= FLAGS2_EXTENDED_ATTRIBUTES;
 877         }
 878
 879         if (protocol >= PROTOCOL_NT1) {
 880                 flags2 |= FLAGS2_IS_LONG_NAME;
 881
 882                 if (smb1_capabilities & CAP_UNICODE) {
 883                         flags2 |= FLAGS2_UNICODE_STRINGS;
 884                 }
 885                 if (smb1_capabilities & CAP_STATUS32) {
 886                         flags2 |= FLAGS2_32_BIT_ERROR_CODES;
 887                 }
 888                 if (smb1_capabilities & CAP_EXTENDED_SECURITY) {
 889                         flags2 |= FLAGS2_EXTENDED_SECURITY;
 890                 }
 891         }
 892
 893         flags |= additional_flags;
 894         flags &= ~clear_flags;
 895         flags2 |= additional_flags2;
 896         flags2 &= ~clear_flags2;
 897
 898         *_flags = flags;
 899         *_flags2 = flags2;
 900 }
 901
 902 struct tevent_req *smb1cli_req_create(TALLOC_CTX *mem_ctx,
 903                                       struct tevent_context *ev,
 904                                       struct smbXcli_conn *conn,
 905                                       uint8_t smb_command,
 906                                       uint8_t additional_flags,
 907                                       uint8_t clear_flags,
 908                                       uint16_t additional_flags2,
 909                                       uint16_t clear_flags2,
 910                                       uint32_t timeout_msec,
 911                                       uint32_t pid,
 912                                       uint16_t tid,
 913                                       uint16_t uid,
 914                                       uint8_t wct, uint16_t *vwv,
 915                                       int iov_count,
 916                                       struct iovec *bytes_iov)
 917 {
 918         struct tevent_req *req;
 919         struct smbXcli_req_state *state;
 920         uint8_t flags = 0;
 921         uint16_t flags2 = 0;
 922
 923         if (iov_count > MAX_SMB_IOV) {
 924                 /*
 925                  * Should not happen :-)
 926                  */
 927                 return NULL;
 928         }
 929
 930         req = tevent_req_create(mem_ctx, &state,
 931                                 struct smbXcli_req_state);
 932         if (req == NULL) {
 933                 return NULL;
 934         }
 935         state->ev = ev;
 936         state->conn = conn;
 937
 938         state->smb1.recv_cmd = 0xFF;
 939         state->smb1.recv_status = NT_STATUS_INTERNAL_ERROR;
 940         state->smb1.recv_iov = talloc_zero_array(state, struct iovec, 3);
 941         if (state->smb1.recv_iov == NULL) {
 942                 TALLOC_FREE(req);
 943                 return NULL;
 944         }
 945
 946         smb1cli_req_flags(conn->protocol,
 947                           conn->smb1.capabilities,
 948                           smb_command,
 949                           additional_flags,
 950                           clear_flags,
 951                           &flags,
 952                           additional_flags2,
 953                           clear_flags2,
 954                           &flags2);
 955
 956         SIVAL(state->smb1.hdr, 0,           SMB_MAGIC);
 957         SCVAL(state->smb1.hdr, HDR_COM,     smb_command);
 958         SIVAL(state->smb1.hdr, HDR_RCLS,    NT_STATUS_V(NT_STATUS_OK));
 959         SCVAL(state->smb1.hdr, HDR_FLG,     flags);
 960         SSVAL(state->smb1.hdr, HDR_FLG2,    flags2);
 961         SSVAL(state->smb1.hdr, HDR_PIDHIGH, pid >> 16);
 962         SSVAL(state->smb1.hdr, HDR_TID,     tid);
 963         SSVAL(state->smb1.hdr, HDR_PID,     pid);
 964         SSVAL(state->smb1.hdr, HDR_UID,     uid);
 965         SSVAL(state->smb1.hdr, HDR_MID,     0); /* this comes later */
 966         SSVAL(state->smb1.hdr, HDR_WCT,     wct);
 967
 968         state->smb1.vwv = vwv;
 969
 970         SSVAL(state->smb1.bytecount_buf, 0, smbXcli_iov_len(bytes_iov, iov_count));
 971
 972         state->smb1.iov[0].iov_base = (void *)state->length_hdr;
 973         state->smb1.iov[0].iov_len  = sizeof(state->length_hdr);
 974         state->smb1.iov[1].iov_base = (void *)state->smb1.hdr;
 975         state->smb1.iov[1].iov_len  = sizeof(state->smb1.hdr);
 976         state->smb1.iov[2].iov_base = (void *)state->smb1.vwv;
 977         state->smb1.iov[2].iov_len  = wct * sizeof(uint16_t);
 978         state->smb1.iov[3].iov_base = (void *)state->smb1.bytecount_buf;
 979         state->smb1.iov[3].iov_len  = sizeof(uint16_t);
 980
 981         if (iov_count != 0) {
 982                 memcpy(&state->smb1.iov[4], bytes_iov,
 983                        iov_count * sizeof(*bytes_iov));
 984         }
 985         state->smb1.iov_count = iov_count + 4;
 986
 987         if (timeout_msec > 0) {
 988                 struct timeval endtime;
 989
 990                 endtime = timeval_current_ofs_msec(timeout_msec);
 991                 if (!tevent_req_set_endtime(req, ev, endtime)) {
 992                         return req;
 993                 }
 994         }
 995
 996         switch (smb_command) {
 997         case SMBtranss:
 998         case SMBtranss2:
 999         case SMBnttranss:
1000         case SMBntcancel:
1001                 state->one_way = true;
1002                 break;
1003         case SMBlockingX:
1004                 if ((wct == 8) &&
1005                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
1006                         state->one_way = true;
1007                 }
1008                 break;
1009         }
1010
1011         return req;
1012 }
1013
1014 static NTSTATUS smb1cli_conn_signv(struct smbXcli_conn *conn,
1015                                    struct iovec *iov, int iov_count,
1016                                    uint32_t *seqnum)
1017 {
1018         uint8_t *buf;
1019
1020         /*
1021          * Obvious optimization: Make cli_calculate_sign_mac work with struct
1022          * iovec directly. MD5Update would do that just fine.
1023          */
1024
1025         if (iov_count < 4) {
1026                 return NT_STATUS_INVALID_PARAMETER_MIX;
1027         }
1028         if (iov[0].iov_len != NBT_HDR_SIZE) {
1029                 return NT_STATUS_INVALID_PARAMETER_MIX;
1030         }
1031         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1032                 return NT_STATUS_INVALID_PARAMETER_MIX;
1033         }
1034         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1035                 return NT_STATUS_INVALID_PARAMETER_MIX;
1036         }
1037         if (iov[3].iov_len != sizeof(uint16_t)) {
1038                 return NT_STATUS_INVALID_PARAMETER_MIX;
1039         }
1040
1041         buf = smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1042         if (buf == NULL) {
1043                 return NT_STATUS_NO_MEMORY;
1044         }
1045
1046         *seqnum = smb_signing_next_seqnum(conn->smb1.signing, false);
1047         smb_signing_sign_pdu(conn->smb1.signing, buf, *seqnum);
1048         memcpy(iov[1].iov_base, buf+4, iov[1].iov_len);
1049
1050         TALLOC_FREE(buf);
1051         return NT_STATUS_OK;
1052 }
1053
1054 static void smb1cli_req_writev_done(struct tevent_req *subreq);
1055 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1056                                                TALLOC_CTX *tmp_mem,
1057                                                uint8_t *inbuf);
1058
1059 static NTSTATUS smb1cli_req_writev_submit(struct tevent_req *req,
1060                                           struct smbXcli_req_state *state,
1061                                           struct iovec *iov, int iov_count)
1062 {
1063         struct tevent_req *subreq;
1064         NTSTATUS status;
1065         uint16_t mid;
1066
1067         if (!smbXcli_conn_is_connected(state->conn)) {
1068                 return NT_STATUS_CONNECTION_DISCONNECTED;
1069         }
1070
1071         if (state->conn->protocol > PROTOCOL_NT1) {
1072                 return NT_STATUS_REVISION_MISMATCH;
1073         }
1074
1075         if (iov_count < 4) {
1076                 return NT_STATUS_INVALID_PARAMETER_MIX;
1077         }
1078         if (iov[0].iov_len != NBT_HDR_SIZE) {
1079                 return NT_STATUS_INVALID_PARAMETER_MIX;
1080         }
1081         if (iov[1].iov_len != (MIN_SMB_SIZE-sizeof(uint16_t))) {
1082                 return NT_STATUS_INVALID_PARAMETER_MIX;
1083         }
1084         if (iov[2].iov_len > (0xFF * sizeof(uint16_t))) {
1085                 return NT_STATUS_INVALID_PARAMETER_MIX;
1086         }
1087         if (iov[3].iov_len != sizeof(uint16_t)) {
1088                 return NT_STATUS_INVALID_PARAMETER_MIX;
1089         }
1090
1091         if (state->smb1.mid != 0) {
1092                 mid = state->smb1.mid;
1093         } else {
1094                 mid = smb1cli_alloc_mid(state->conn);
1095         }
1096         SSVAL(iov[1].iov_base, HDR_MID, mid);
1097
1098         _smb_setlen_nbt(iov[0].iov_base, smbXcli_iov_len(&iov[1], iov_count-1));
1099
1100         status = smb1cli_conn_signv(state->conn, iov, iov_count,
1101                                     &state->smb1.seqnum);
1102
1103         if (!NT_STATUS_IS_OK(status)) {
1104                 return status;
1105         }
1106
1107         /*
1108          * If we supported multiple encrytion contexts
1109          * here we'd look up based on tid.
1110          */
1111         if (common_encryption_on(state->conn->smb1.trans_enc)) {
1112                 char *buf, *enc_buf;
1113
1114                 buf = (char *)smbXcli_iov_concat(talloc_tos(), iov, iov_count);
1115                 if (buf == NULL) {
1116                         return NT_STATUS_NO_MEMORY;
1117                 }
1118                 status = common_encrypt_buffer(state->conn->smb1.trans_enc,
1119                                                (char *)buf, &enc_buf);
1120                 TALLOC_FREE(buf);
1121                 if (!NT_STATUS_IS_OK(status)) {
1122                         DEBUG(0, ("Error in encrypting client message: %s\n",
1123                                   nt_errstr(status)));
1124                         return status;
1125                 }
1126                 buf = (char *)talloc_memdup(state, enc_buf,
1127                                             smb_len_nbt(enc_buf)+4);
1128                 SAFE_FREE(enc_buf);
1129                 if (buf == NULL) {
1130                         return NT_STATUS_NO_MEMORY;
1131                 }
1132                 iov[0].iov_base = (void *)buf;
1133                 iov[0].iov_len = talloc_get_size(buf);
1134                 iov_count = 1;
1135         }
1136
1137         if (state->conn->dispatch_incoming == NULL) {
1138                 state->conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
1139         }
1140
1141         subreq = writev_send(state, state->ev, state->conn->outgoing,
1142                              state->conn->fd, false, iov, iov_count);
1143         if (subreq == NULL) {
1144                 return NT_STATUS_NO_MEMORY;
1145         }
1146         tevent_req_set_callback(subreq, smb1cli_req_writev_done, req);
1147         return NT_STATUS_OK;
1148 }
1149
1150 struct tevent_req *smb1cli_req_send(TALLOC_CTX *mem_ctx,
1151                                     struct tevent_context *ev,
1152                                     struct smbXcli_conn *conn,
1153                                     uint8_t smb_command,
1154                                     uint8_t additional_flags,
1155                                     uint8_t clear_flags,
1156                                     uint16_t additional_flags2,
1157                                     uint16_t clear_flags2,
1158                                     uint32_t timeout_msec,
1159                                     uint32_t pid,
1160                                     uint16_t tid,
1161                                     uint16_t uid,
1162                                     uint8_t wct, uint16_t *vwv,
1163                                     uint32_t num_bytes,
1164                                     const uint8_t *bytes)
1165 {
1166         struct tevent_req *req;
1167         struct iovec iov;
1168         NTSTATUS status;
1169
1170         iov.iov_base = discard_const_p(void, bytes);
1171         iov.iov_len = num_bytes;
1172
1173         req = smb1cli_req_create(mem_ctx, ev, conn, smb_command,
1174                                  additional_flags, clear_flags,
1175                                  additional_flags2, clear_flags2,
1176                                  timeout_msec,
1177                                  pid, tid, uid,
1178                                  wct, vwv, 1, &iov);
1179         if (req == NULL) {
1180                 return NULL;
1181         }
1182         if (!tevent_req_is_in_progress(req)) {
1183                 return tevent_req_post(req, ev);
1184         }
1185         status = smb1cli_req_chain_submit(&req, 1);
1186         if (tevent_req_nterror(req, status)) {
1187                 return tevent_req_post(req, ev);
1188         }
1189         return req;
1190 }
1191
1192 static void smb1cli_req_writev_done(struct tevent_req *subreq)
1193 {
1194         struct tevent_req *req =
1195                 tevent_req_callback_data(subreq,
1196                 struct tevent_req);
1197         struct smbXcli_req_state *state =
1198                 tevent_req_data(req,
1199                 struct smbXcli_req_state);
1200         ssize_t nwritten;
1201         int err;
1202
1203         nwritten = writev_recv(subreq, &err);
1204         TALLOC_FREE(subreq);
1205         if (nwritten == -1) {
1206                 NTSTATUS status = map_nt_error_from_unix_common(err);
1207                 smbXcli_conn_disconnect(state->conn, status);
1208                 return;
1209         }
1210
1211         if (state->one_way) {
1212                 state->inbuf = NULL;
1213                 tevent_req_done(req);
1214                 return;
1215         }
1216
1217         if (!smbXcli_req_set_pending(req)) {
1218                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
1219                 return;
1220         }
1221 }
1222
1223 static void smbXcli_conn_received(struct tevent_req *subreq)
1224 {
1225         struct smbXcli_conn *conn =
1226                 tevent_req_callback_data(subreq,
1227                 struct smbXcli_conn);
1228         TALLOC_CTX *frame = talloc_stackframe();
1229         NTSTATUS status;
1230         uint8_t *inbuf;
1231         ssize_t received;
1232         int err;
1233
1234         if (subreq != conn->read_smb_req) {
1235                 DEBUG(1, ("Internal error: cli_smb_received called with "
1236                           "unexpected subreq\n"));
1237                 status = NT_STATUS_INTERNAL_ERROR;
1238                 smbXcli_conn_disconnect(conn, status);
1239                 TALLOC_FREE(frame);
1240                 return;
1241         }
1242         conn->read_smb_req = NULL;
1243
1244         received = read_smb_recv(subreq, frame, &inbuf, &err);
1245         TALLOC_FREE(subreq);
1246         if (received == -1) {
1247                 status = map_nt_error_from_unix_common(err);
1248                 smbXcli_conn_disconnect(conn, status);
1249                 TALLOC_FREE(frame);
1250                 return;
1251         }
1252
1253         status = conn->dispatch_incoming(conn, frame, inbuf);
1254         TALLOC_FREE(frame);
1255         if (NT_STATUS_IS_OK(status)) {
1256                 /*
1257                  * We should not do any more processing
1258                  * as the dispatch function called
1259                  * tevent_req_done().
1260                  */
1261                 return;
1262         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1263                 /*
1264                  * We got an error, so notify all pending requests
1265                  */
1266                 smbXcli_conn_disconnect(conn, status);
1267                 return;
1268         }
1269
1270         /*
1271          * We got NT_STATUS_RETRY, so we may ask for a
1272          * next incoming pdu.
1273          */
1274         if (!smbXcli_conn_receive_next(conn)) {
1275                 smbXcli_conn_disconnect(conn, NT_STATUS_NO_MEMORY);
1276         }
1277 }
1278
1279 static NTSTATUS smb1cli_inbuf_parse_chain(uint8_t *buf, TALLOC_CTX *mem_ctx,
1280                                           struct iovec **piov, int *pnum_iov)
1281 {
1282         struct iovec *iov;
1283         int num_iov;
1284         size_t buflen;
1285         size_t taken;
1286         size_t remaining;
1287         uint8_t *hdr;
1288         uint8_t cmd;
1289         uint32_t wct_ofs;
1290
1291         buflen = smb_len_nbt(buf);
1292         taken = 0;
1293
1294         hdr = buf + NBT_HDR_SIZE;
1295
1296         if (buflen < MIN_SMB_SIZE) {
1297                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1298         }
1299
1300         /*
1301          * This returns iovec elements in the following order:
1302          *
1303          * - SMB header
1304          *
1305          * - Parameter Block
1306          * - Data Block
1307          *
1308          * - Parameter Block
1309          * - Data Block
1310          *
1311          * - Parameter Block
1312          * - Data Block
1313          */
1314         num_iov = 1;
1315
1316         iov = talloc_array(mem_ctx, struct iovec, num_iov);
1317         if (iov == NULL) {
1318                 return NT_STATUS_NO_MEMORY;
1319         }
1320         iov[0].iov_base = hdr;
1321         iov[0].iov_len = HDR_WCT;
1322         taken += HDR_WCT;
1323
1324         cmd = CVAL(hdr, HDR_COM);
1325         wct_ofs = HDR_WCT;
1326
1327         while (true) {
1328                 size_t len = buflen - taken;
1329                 struct iovec *cur;
1330                 struct iovec *iov_tmp;
1331                 uint8_t wct;
1332                 uint32_t bcc_ofs;
1333                 uint16_t bcc;
1334                 size_t needed;
1335
1336                 /*
1337                  * we need at least WCT and BCC
1338                  */
1339                 needed = sizeof(uint8_t) + sizeof(uint16_t);
1340                 if (len < needed) {
1341                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1342                                    __location__, (int)len, (int)needed));
1343                         goto inval;
1344                 }
1345
1346                 /*
1347                  * Now we check if the specified words are there
1348                  */
1349                 wct = CVAL(hdr, wct_ofs);
1350                 needed += wct * sizeof(uint16_t);
1351                 if (len < needed) {
1352                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1353                                    __location__, (int)len, (int)needed));
1354                         goto inval;
1355                 }
1356
1357                 /*
1358                  * Now we check if the specified bytes are there
1359                  */
1360                 bcc_ofs = wct_ofs + sizeof(uint8_t) + wct * sizeof(uint16_t);
1361                 bcc = SVAL(hdr, bcc_ofs);
1362                 needed += bcc * sizeof(uint8_t);
1363                 if (len < needed) {
1364                         DEBUG(10, ("%s: %d bytes left, expected at least %d\n",
1365                                    __location__, (int)len, (int)needed));
1366                         goto inval;
1367                 }
1368
1369                 /*
1370                  * we allocate 2 iovec structures for words and bytes
1371                  */
1372                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
1373                                          num_iov + 2);
1374                 if (iov_tmp == NULL) {
1375                         TALLOC_FREE(iov);
1376                         return NT_STATUS_NO_MEMORY;
1377                 }
1378                 iov = iov_tmp;
1379                 cur = &iov[num_iov];
1380                 num_iov += 2;
1381
1382                 cur[0].iov_len = wct * sizeof(uint16_t);
1383                 cur[0].iov_base = hdr + (wct_ofs + sizeof(uint8_t));
1384                 cur[1].iov_len = bcc * sizeof(uint8_t);
1385                 cur[1].iov_base = hdr + (bcc_ofs + sizeof(uint16_t));
1386
1387                 taken += needed;
1388
1389                 if (!smb1cli_is_andx_req(cmd)) {
1390                         /*
1391                          * If the current command does not have AndX chanining
1392                          * we are done.
1393                          */
1394                         break;
1395                 }
1396
1397                 if (wct == 0 && bcc == 0) {
1398                         /*
1399                          * An empty response also ends the chain,
1400                          * most likely with an error.
1401                          */
1402                         break;
1403                 }
1404
1405                 if (wct < 2) {
1406                         DEBUG(10, ("%s: wct[%d] < 2 for cmd[0x%02X]\n",
1407                                    __location__, (int)wct, (int)cmd));
1408                         goto inval;
1409                 }
1410                 cmd = CVAL(cur[0].iov_base, 0);
1411                 if (cmd == 0xFF) {
1412                         /*
1413                          * If it is the end of the chain we are also done.
1414                          */
1415                         break;
1416                 }
1417                 wct_ofs = SVAL(cur[0].iov_base, 2);
1418
1419                 if (wct_ofs < taken) {
1420                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1421                 }
1422                 if (wct_ofs > buflen) {
1423                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1424                 }
1425
1426                 /*
1427                  * we consumed everything up to the start of the next
1428                  * parameter block.
1429                  */
1430                 taken = wct_ofs;
1431         }
1432
1433         remaining = buflen - taken;
1434
1435         if (remaining > 0 && num_iov >= 3) {
1436                 /*
1437                  * The last DATA block gets the remaining
1438                  * bytes, this is needed to support
1439                  * CAP_LARGE_WRITEX and CAP_LARGE_READX.
1440                  */
1441                 iov[num_iov-1].iov_len += remaining;
1442         }
1443
1444         *piov = iov;
1445         *pnum_iov = num_iov;
1446         return NT_STATUS_OK;
1447
1448 inval:
1449         TALLOC_FREE(iov);
1450         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1451 }
1452
1453 static NTSTATUS smb1cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
1454                                                TALLOC_CTX *tmp_mem,
1455                                                uint8_t *inbuf)
1456 {
1457         struct tevent_req *req;
1458         struct smbXcli_req_state *state;
1459         NTSTATUS status;
1460         size_t num_pending;
1461         size_t i;
1462         uint8_t cmd;
1463         uint16_t mid;
1464         bool oplock_break;
1465         const uint8_t *inhdr = inbuf + NBT_HDR_SIZE;
1466         struct iovec *iov = NULL;
1467         int num_iov = 0;
1468         struct tevent_req **chain = NULL;
1469         size_t num_chained = 0;
1470         size_t num_responses = 0;
1471
1472         if ((IVAL(inhdr, 0) != SMB_MAGIC) /* 0xFF"SMB" */
1473             && (SVAL(inhdr, 0) != 0x45ff)) /* 0xFF"E" */ {
1474                 DEBUG(10, ("Got non-SMB PDU\n"));
1475                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1476         }
1477
1478         /*
1479          * If we supported multiple encrytion contexts
1480          * here we'd look up based on tid.
1481          */
1482         if (common_encryption_on(conn->smb1.trans_enc)
1483             && (CVAL(inbuf, 0) == 0)) {
1484                 uint16_t enc_ctx_num;
1485
1486                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
1487                 if (!NT_STATUS_IS_OK(status)) {
1488                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
1489                                    nt_errstr(status)));
1490                         return status;
1491                 }
1492
1493                 if (enc_ctx_num != conn->smb1.trans_enc->enc_ctx_num) {
1494                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
1495                                    enc_ctx_num,
1496                                    conn->smb1.trans_enc->enc_ctx_num));
1497                         return NT_STATUS_INVALID_HANDLE;
1498                 }
1499
1500                 status = common_decrypt_buffer(conn->smb1.trans_enc,
1501                                                (char *)inbuf);
1502                 if (!NT_STATUS_IS_OK(status)) {
1503                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
1504                                    nt_errstr(status)));
1505                         return status;
1506                 }
1507         }
1508
1509         mid = SVAL(inhdr, HDR_MID);
1510         num_pending = talloc_array_length(conn->pending);
1511
1512         for (i=0; i<num_pending; i++) {
1513                 if (mid == smb1cli_req_mid(conn->pending[i])) {
1514                         break;
1515                 }
1516         }
1517         if (i == num_pending) {
1518                 /* Dump unexpected reply */
1519                 return NT_STATUS_RETRY;
1520         }
1521
1522         oplock_break = false;
1523
1524         if (mid == 0xffff) {
1525                 /*
1526                  * Paranoia checks that this is really an oplock break request.
1527                  */
1528                 oplock_break = (smb_len_nbt(inbuf) == 51); /* hdr + 8 words */
1529                 oplock_break &= ((CVAL(inhdr, HDR_FLG) & FLAG_REPLY) == 0);
1530                 oplock_break &= (CVAL(inhdr, HDR_COM) == SMBlockingX);
1531                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(6)) == 0);
1532                 oplock_break &= (SVAL(inhdr, HDR_VWV+VWV(7)) == 0);
1533
1534                 if (!oplock_break) {
1535                         /* Dump unexpected reply */
1536                         return NT_STATUS_RETRY;
1537                 }
1538         }
1539
1540         req = conn->pending[i];
1541         state = tevent_req_data(req, struct smbXcli_req_state);
1542
1543         if (!oplock_break /* oplock breaks are not signed */
1544             && !smb_signing_check_pdu(conn->smb1.signing,
1545                                       inbuf, state->smb1.seqnum+1)) {
1546                 DEBUG(10, ("cli_check_sign_mac failed\n"));
1547                 return NT_STATUS_ACCESS_DENIED;
1548         }
1549
1550         status = smb1cli_inbuf_parse_chain(inbuf, tmp_mem,
1551                                            &iov, &num_iov);
1552         if (!NT_STATUS_IS_OK(status)) {
1553                 DEBUG(10,("smb1cli_inbuf_parse_chain - %s\n",
1554                           nt_errstr(status)));
1555                 return status;
1556         }
1557
1558         cmd = CVAL(inhdr, HDR_COM);
1559         status = smb1cli_pull_raw_error(inhdr);
1560
1561         if (state->smb1.chained_requests == NULL) {
1562                 if (num_iov != 3) {
1563                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
1564                 }
1565
1566                 smbXcli_req_unset_pending(req);
1567
1568                 state->smb1.recv_cmd = cmd;
1569                 state->smb1.recv_status = status;
1570                 state->inbuf = talloc_move(state->smb1.recv_iov, &inbuf);
1571
1572                 state->smb1.recv_iov[0] = iov[0];
1573                 state->smb1.recv_iov[1] = iov[1];
1574                 state->smb1.recv_iov[2] = iov[2];
1575
1576                 if (talloc_array_length(conn->pending) == 0) {
1577                         tevent_req_done(req);
1578                         return NT_STATUS_OK;
1579                 }
1580
1581                 tevent_req_defer_callback(req, state->ev);
1582                 tevent_req_done(req);
1583                 return NT_STATUS_RETRY;
1584         }
1585
1586         chain = talloc_move(tmp_mem, &state->smb1.chained_requests);
1587         num_chained = talloc_array_length(chain);
1588         num_responses = (num_iov - 1)/2;
1589
1590         if (num_responses > num_chained) {
1591                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1592         }
1593
1594         for (i=0; i<num_chained; i++) {
1595                 size_t iov_idx = 1 + (i*2);
1596                 struct iovec *cur = &iov[iov_idx];
1597                 uint8_t *inbuf_ref;
1598
1599                 req = chain[i];
1600                 state = tevent_req_data(req, struct smbXcli_req_state);
1601
1602                 smbXcli_req_unset_pending(req);
1603
1604                 /*
1605                  * as we finish multiple requests here
1606                  * we need to defer the callbacks as
1607                  * they could destroy our current stack state.
1608                  */
1609                 tevent_req_defer_callback(req, state->ev);
1610
1611                 if (i >= num_responses) {
1612                         tevent_req_nterror(req, NT_STATUS_REQUEST_ABORTED);
1613                         continue;
1614                 }
1615
1616                 state->smb1.recv_cmd = cmd;
1617
1618                 if (i == (num_responses - 1)) {
1619                         /*
1620                          * The last request in the chain gets the status
1621                          */
1622                         state->smb1.recv_status = status;
1623                 } else {
1624                         cmd = CVAL(cur[0].iov_base, 0);
1625                         state->smb1.recv_status = NT_STATUS_OK;
1626                 }
1627
1628                 state->inbuf = inbuf;
1629
1630                 /*
1631                  * Note: here we use talloc_reference() in a way
1632                  *       that does not expose it to the caller.
1633                  */
1634                 inbuf_ref = talloc_reference(state->smb1.recv_iov, inbuf);
1635                 if (tevent_req_nomem(inbuf_ref, req)) {
1636                         continue;
1637                 }
1638
1639                 /* copy the related buffers */
1640                 state->smb1.recv_iov[0] = iov[0];
1641                 state->smb1.recv_iov[1] = cur[0];
1642                 state->smb1.recv_iov[2] = cur[1];
1643
1644                 tevent_req_done(req);
1645         }
1646
1647         return NT_STATUS_RETRY;
1648 }
1649
1650 NTSTATUS smb1cli_req_recv(struct tevent_req *req,
1651                           TALLOC_CTX *mem_ctx,
1652                           struct iovec **piov,
1653                           uint8_t **phdr,
1654                           uint8_t *pwct,
1655                           uint16_t **pvwv,
1656                           uint32_t *pvwv_offset,
1657                           uint32_t *pnum_bytes,
1658                           uint8_t **pbytes,
1659                           uint32_t *pbytes_offset,
1660                           uint8_t **pinbuf,
1661                           const struct smb1cli_req_expected_response *expected,
1662                           size_t num_expected)
1663 {
1664         struct smbXcli_req_state *state =
1665                 tevent_req_data(req,
1666                 struct smbXcli_req_state);
1667         NTSTATUS status = NT_STATUS_OK;
1668         struct iovec *recv_iov = NULL;
1669         uint8_t *hdr = NULL;
1670         uint8_t wct = 0;
1671         uint32_t vwv_offset = 0;
1672         uint16_t *vwv = NULL;
1673         uint32_t num_bytes = 0;
1674         uint32_t bytes_offset = 0;
1675         uint8_t *bytes = NULL;
1676         size_t i;
1677         bool found_status = false;
1678         bool found_size = false;
1679
1680         if (piov != NULL) {
1681                 *piov = NULL;
1682         }
1683         if (phdr != NULL) {
1684                 *phdr = 0;
1685         }
1686         if (pwct != NULL) {
1687                 *pwct = 0;
1688         }
1689         if (pvwv != NULL) {
1690                 *pvwv = NULL;
1691         }
1692         if (pvwv_offset != NULL) {
1693                 *pvwv_offset = 0;
1694         }
1695         if (pnum_bytes != NULL) {
1696                 *pnum_bytes = 0;
1697         }
1698         if (pbytes != NULL) {
1699                 *pbytes = NULL;
1700         }
1701         if (pbytes_offset != NULL) {
1702                 *pbytes_offset = 0;
1703         }
1704         if (pinbuf != NULL) {
1705                 *pinbuf = NULL;
1706         }
1707
1708         if (state->inbuf != NULL) {
1709                 recv_iov = state->smb1.recv_iov;
1710                 hdr = (uint8_t *)recv_iov[0].iov_base;
1711                 wct = recv_iov[1].iov_len/2;
1712                 vwv = (uint16_t *)recv_iov[1].iov_base;
1713                 vwv_offset = PTR_DIFF(vwv, hdr);
1714                 num_bytes = recv_iov[2].iov_len;
1715                 bytes = (uint8_t *)recv_iov[2].iov_base;
1716                 bytes_offset = PTR_DIFF(bytes, hdr);
1717         }
1718
1719         if (tevent_req_is_nterror(req, &status)) {
1720                 for (i=0; i < num_expected; i++) {
1721                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
1722                                 found_status = true;
1723                                 break;
1724                         }
1725                 }
1726
1727                 if (found_status) {
1728                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
1729                 }
1730
1731                 return status;
1732         }
1733
1734         if (num_expected == 0) {
1735                 found_status = true;
1736                 found_size = true;
1737         }
1738
1739         status = state->smb1.recv_status;
1740
1741         for (i=0; i < num_expected; i++) {
1742                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
1743                         continue;
1744                 }
1745
1746                 found_status = true;
1747                 if (expected[i].wct == 0) {
1748                         found_size = true;
1749                         break;
1750                 }
1751
1752                 if (expected[i].wct == wct) {
1753                         found_size = true;
1754                         break;
1755                 }
1756         }
1757
1758         if (!found_status) {
1759                 return status;
1760         }
1761
1762         if (!found_size) {
1763                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
1764         }
1765
1766         if (piov != NULL) {
1767                 *piov = talloc_move(mem_ctx, &recv_iov);
1768         }
1769
1770         if (phdr != NULL) {
1771                 *phdr = hdr;
1772         }
1773         if (pwct != NULL) {
1774                 *pwct = wct;
1775         }
1776         if (pvwv != NULL) {
1777                 *pvwv = vwv;
1778         }
1779         if (pvwv_offset != NULL) {
1780                 *pvwv_offset = vwv_offset;
1781         }
1782         if (pnum_bytes != NULL) {
1783                 *pnum_bytes = num_bytes;
1784         }
1785         if (pbytes != NULL) {
1786                 *pbytes = bytes;
1787         }
1788         if (pbytes_offset != NULL) {
1789                 *pbytes_offset = bytes_offset;
1790         }
1791         if (pinbuf != NULL) {
1792                 *pinbuf = state->inbuf;
1793         }
1794
1795         return status;
1796 }
1797
1798 size_t smb1cli_req_wct_ofs(struct tevent_req **reqs, int num_reqs)
1799 {
1800         size_t wct_ofs;
1801         int i;
1802
1803         wct_ofs = HDR_WCT;
1804
1805         for (i=0; i<num_reqs; i++) {
1806                 struct smbXcli_req_state *state;
1807                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1808                 wct_ofs += smbXcli_iov_len(state->smb1.iov+2,
1809                                            state->smb1.iov_count-2);
1810                 wct_ofs = (wct_ofs + 3) & ~3;
1811         }
1812         return wct_ofs;
1813 }
1814
1815 NTSTATUS smb1cli_req_chain_submit(struct tevent_req **reqs, int num_reqs)
1816 {
1817         struct smbXcli_req_state *first_state =
1818                 tevent_req_data(reqs[0],
1819                 struct smbXcli_req_state);
1820         struct smbXcli_req_state *state;
1821         size_t wct_offset;
1822         size_t chain_padding = 0;
1823         int i, iovlen;
1824         struct iovec *iov = NULL;
1825         struct iovec *this_iov;
1826         NTSTATUS status;
1827         size_t nbt_len;
1828
1829         if (num_reqs == 1) {
1830                 return smb1cli_req_writev_submit(reqs[0], first_state,
1831                                                  first_state->smb1.iov,
1832                                                  first_state->smb1.iov_count);
1833         }
1834
1835         iovlen = 0;
1836         for (i=0; i<num_reqs; i++) {
1837                 if (!tevent_req_is_in_progress(reqs[i])) {
1838                         return NT_STATUS_INTERNAL_ERROR;
1839                 }
1840
1841                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1842
1843                 if (state->smb1.iov_count < 4) {
1844                         return NT_STATUS_INVALID_PARAMETER_MIX;
1845                 }
1846
1847                 if (i == 0) {
1848                         /*
1849                          * The NBT and SMB header
1850                          */
1851                         iovlen += 2;
1852                 } else {
1853                         /*
1854                          * Chain padding
1855                          */
1856                         iovlen += 1;
1857                 }
1858
1859                 /*
1860                  * words and bytes
1861                  */
1862                 iovlen += state->smb1.iov_count - 2;
1863         }
1864
1865         iov = talloc_zero_array(first_state, struct iovec, iovlen);
1866         if (iov == NULL) {
1867                 return NT_STATUS_NO_MEMORY;
1868         }
1869
1870         first_state->smb1.chained_requests = (struct tevent_req **)talloc_memdup(
1871                 first_state, reqs, sizeof(*reqs) * num_reqs);
1872         if (first_state->smb1.chained_requests == NULL) {
1873                 TALLOC_FREE(iov);
1874                 return NT_STATUS_NO_MEMORY;
1875         }
1876
1877         wct_offset = HDR_WCT;
1878         this_iov = iov;
1879
1880         for (i=0; i<num_reqs; i++) {
1881                 size_t next_padding = 0;
1882                 uint16_t *vwv;
1883
1884                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
1885
1886                 if (i < num_reqs-1) {
1887                         if (!smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))
1888                             || CVAL(state->smb1.hdr, HDR_WCT) < 2) {
1889                                 TALLOC_FREE(iov);
1890                                 TALLOC_FREE(first_state->smb1.chained_requests);
1891                                 return NT_STATUS_INVALID_PARAMETER_MIX;
1892                         }
1893                 }
1894
1895                 wct_offset += smbXcli_iov_len(state->smb1.iov+2,
1896                                               state->smb1.iov_count-2) + 1;
1897                 if ((wct_offset % 4) != 0) {
1898                         next_padding = 4 - (wct_offset % 4);
1899                 }
1900                 wct_offset += next_padding;
1901                 vwv = state->smb1.vwv;
1902
1903                 if (i < num_reqs-1) {
1904                         struct smbXcli_req_state *next_state =
1905                                 tevent_req_data(reqs[i+1],
1906                                 struct smbXcli_req_state);
1907                         SCVAL(vwv+0, 0, CVAL(next_state->smb1.hdr, HDR_COM));
1908                         SCVAL(vwv+0, 1, 0);
1909                         SSVAL(vwv+1, 0, wct_offset);
1910                 } else if (smb1cli_is_andx_req(CVAL(state->smb1.hdr, HDR_COM))) {
1911                         /* properly end the chain */
1912                         SCVAL(vwv+0, 0, 0xff);
1913                         SCVAL(vwv+0, 1, 0xff);
1914                         SSVAL(vwv+1, 0, 0);
1915                 }
1916
1917                 if (i == 0) {
1918                         /*
1919                          * The NBT and SMB header
1920                          */
1921                         this_iov[0] = state->smb1.iov[0];
1922                         this_iov[1] = state->smb1.iov[1];
1923                         this_iov += 2;
1924                 } else {
1925                         /*
1926                          * This one is a bit subtle. We have to add
1927                          * chain_padding bytes between the requests, and we
1928                          * have to also include the wct field of the
1929                          * subsequent requests. We use the subsequent header
1930                          * for the padding, it contains the wct field in its
1931                          * last byte.
1932                          */
1933                         this_iov[0].iov_len = chain_padding+1;
1934                         this_iov[0].iov_base = (void *)&state->smb1.hdr[
1935                                 sizeof(state->smb1.hdr) - this_iov[0].iov_len];
1936                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
1937                         this_iov += 1;
1938                 }
1939
1940                 /*
1941                  * copy the words and bytes
1942                  */
1943                 memcpy(this_iov, state->smb1.iov+2,
1944                        sizeof(struct iovec) * (state->smb1.iov_count-2));
1945                 this_iov += state->smb1.iov_count - 2;
1946                 chain_padding = next_padding;
1947         }
1948
1949         nbt_len = smbXcli_iov_len(&iov[1], iovlen-1);
1950         if (nbt_len > first_state->conn->smb1.max_xmit) {
1951                 TALLOC_FREE(iov);
1952                 TALLOC_FREE(first_state->smb1.chained_requests);
1953                 return NT_STATUS_INVALID_PARAMETER_MIX;
1954         }
1955
1956         status = smb1cli_req_writev_submit(reqs[0], first_state, iov, iovlen);
1957         if (!NT_STATUS_IS_OK(status)) {
1958                 TALLOC_FREE(iov);
1959                 TALLOC_FREE(first_state->smb1.chained_requests);
1960                 return status;
1961         }
1962
1963         return NT_STATUS_OK;
1964 }
1965
1966 bool smbXcli_conn_has_async_calls(struct smbXcli_conn *conn)
1967 {
1968         return ((tevent_queue_length(conn->outgoing) != 0)
1969                 || (talloc_array_length(conn->pending) != 0));
1970 }
1971
1972 uint32_t smb2cli_conn_server_capabilities(struct smbXcli_conn *conn)
1973 {
1974         return conn->smb2.server.capabilities;
1975 }
1976
1977 uint16_t smb2cli_conn_server_security_mode(struct smbXcli_conn *conn)
1978 {
1979         return conn->smb2.server.security_mode;
1980 }
1981
1982 uint32_t smb2cli_conn_max_trans_size(struct smbXcli_conn *conn)
1983 {
1984         return conn->smb2.server.max_trans_size;
1985 }
1986
1987 uint32_t smb2cli_conn_max_read_size(struct smbXcli_conn *conn)
1988 {
1989         return conn->smb2.server.max_read_size;
1990 }
1991
1992 uint32_t smb2cli_conn_max_write_size(struct smbXcli_conn *conn)
1993 {
1994         return conn->smb2.server.max_write_size;
1995 }
1996
1997 void smb2cli_conn_set_max_credits(struct smbXcli_conn *conn,
1998                                   uint16_t max_credits)
1999 {
2000         conn->smb2.max_credits = max_credits;
2001 }
2002
2003 struct tevent_req *smb2cli_req_create(TALLOC_CTX *mem_ctx,
2004                                       struct tevent_context *ev,
2005                                       struct smbXcli_conn *conn,
2006                                       uint16_t cmd,
2007                                       uint32_t additional_flags,
2008                                       uint32_t clear_flags,
2009                                       uint32_t timeout_msec,
2010                                       uint32_t pid,
2011                                       uint32_t tid,
2012                                       struct smbXcli_session *session,
2013                                       const uint8_t *fixed,
2014                                       uint16_t fixed_len,
2015                                       const uint8_t *dyn,
2016                                       uint32_t dyn_len)
2017 {
2018         struct tevent_req *req;
2019         struct smbXcli_req_state *state;
2020         uint32_t flags = 0;
2021         uint64_t uid = 0;
2022
2023         req = tevent_req_create(mem_ctx, &state,
2024                                 struct smbXcli_req_state);
2025         if (req == NULL) {
2026                 return NULL;
2027         }
2028
2029         state->ev = ev;
2030         state->conn = conn;
2031         state->session = session;
2032
2033         if (session) {
2034                 uid = session->smb2.session_id;
2035         }
2036
2037         state->smb2.recv_iov = talloc_zero_array(state, struct iovec, 3);
2038         if (state->smb2.recv_iov == NULL) {
2039                 TALLOC_FREE(req);
2040                 return NULL;
2041         }
2042
2043         flags |= additional_flags;
2044         flags &= ~clear_flags;
2045
2046         state->smb2.fixed = fixed;
2047         state->smb2.fixed_len = fixed_len;
2048         state->smb2.dyn = dyn;
2049         state->smb2.dyn_len = dyn_len;
2050
2051         SIVAL(state->smb2.hdr, SMB2_HDR_PROTOCOL_ID,    SMB2_MAGIC);
2052         SSVAL(state->smb2.hdr, SMB2_HDR_LENGTH,         SMB2_HDR_BODY);
2053         SSVAL(state->smb2.hdr, SMB2_HDR_OPCODE,         cmd);
2054         SIVAL(state->smb2.hdr, SMB2_HDR_FLAGS,          flags);
2055         SIVAL(state->smb2.hdr, SMB2_HDR_PID,            pid);
2056         SIVAL(state->smb2.hdr, SMB2_HDR_TID,            tid);
2057         SBVAL(state->smb2.hdr, SMB2_HDR_SESSION_ID,     uid);
2058
2059         switch (cmd) {
2060         case SMB2_OP_CANCEL:
2061                 state->one_way = true;
2062                 break;
2063         case SMB2_OP_BREAK:
2064                 /*
2065                  * If this is a dummy request, it will have
2066                  * UINT64_MAX as message id.
2067                  * If we send on break acknowledgement,
2068                  * this gets overwritten later.
2069                  */
2070                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, UINT64_MAX);
2071                 break;
2072         }
2073
2074         if (timeout_msec > 0) {
2075                 struct timeval endtime;
2076
2077                 endtime = timeval_current_ofs_msec(timeout_msec);
2078                 if (!tevent_req_set_endtime(req, ev, endtime)) {
2079                         return req;
2080                 }
2081         }
2082
2083         return req;
2084 }
2085
2086 static void smb2cli_writev_done(struct tevent_req *subreq);
2087 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2088                                                TALLOC_CTX *tmp_mem,
2089                                                uint8_t *inbuf);
2090
2091 NTSTATUS smb2cli_req_compound_submit(struct tevent_req **reqs,
2092                                      int num_reqs)
2093 {
2094         struct smbXcli_req_state *state;
2095         struct tevent_req *subreq;
2096         struct iovec *iov;
2097         int i, num_iov, nbt_len;
2098
2099         /*
2100          * 1 for the nbt length
2101          * per request: HDR, fixed, dyn, padding
2102          * -1 because the last one does not need padding
2103          */
2104
2105         iov = talloc_array(reqs[0], struct iovec, 1 + 4*num_reqs - 1);
2106         if (iov == NULL) {
2107                 return NT_STATUS_NO_MEMORY;
2108         }
2109
2110         num_iov = 1;
2111         nbt_len = 0;
2112
2113         for (i=0; i<num_reqs; i++) {
2114                 int hdr_iov;
2115                 size_t reqlen;
2116                 bool ret;
2117                 uint64_t avail;
2118                 uint16_t charge;
2119                 uint16_t credits;
2120                 uint64_t mid;
2121                 bool should_sign = false;
2122
2123                 if (!tevent_req_is_in_progress(reqs[i])) {
2124                         return NT_STATUS_INTERNAL_ERROR;
2125                 }
2126
2127                 state = tevent_req_data(reqs[i], struct smbXcli_req_state);
2128
2129                 if (!smbXcli_conn_is_connected(state->conn)) {
2130                         return NT_STATUS_CONNECTION_DISCONNECTED;
2131                 }
2132
2133                 if ((state->conn->protocol != PROTOCOL_NONE) &&
2134                     (state->conn->protocol < PROTOCOL_SMB2_02)) {
2135                         return NT_STATUS_REVISION_MISMATCH;
2136                 }
2137
2138                 avail = UINT64_MAX - state->conn->smb2.mid;
2139                 if (avail < 1) {
2140                         return NT_STATUS_CONNECTION_ABORTED;
2141                 }
2142
2143                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2144                         charge = (MAX(state->smb2.dyn_len, 1) - 1)/ 65536 + 1;
2145                 } else {
2146                         charge = 1;
2147                 }
2148
2149                 charge = MAX(state->smb2.credit_charge, charge);
2150
2151                 avail = MIN(avail, state->conn->smb2.cur_credits);
2152                 if (avail < charge) {
2153                         return NT_STATUS_INTERNAL_ERROR;
2154                 }
2155
2156                 credits = 0;
2157                 if (state->conn->smb2.max_credits > state->conn->smb2.cur_credits) {
2158                         credits = state->conn->smb2.max_credits -
2159                                   state->conn->smb2.cur_credits;
2160                 }
2161                 if (state->conn->smb2.max_credits >= state->conn->smb2.cur_credits) {
2162                         credits += 1;
2163                 }
2164
2165                 mid = state->conn->smb2.mid;
2166                 state->conn->smb2.mid += charge;
2167                 state->conn->smb2.cur_credits -= charge;
2168
2169                 if (state->conn->smb2.server.capabilities & SMB2_CAP_LARGE_MTU) {
2170                         SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT_CHARGE, charge);
2171                 }
2172                 SSVAL(state->smb2.hdr, SMB2_HDR_CREDIT, credits);
2173                 SBVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID, mid);
2174
2175                 hdr_iov = num_iov;
2176                 iov[num_iov].iov_base = state->smb2.hdr;
2177                 iov[num_iov].iov_len  = sizeof(state->smb2.hdr);
2178                 num_iov += 1;
2179
2180                 iov[num_iov].iov_base = discard_const(state->smb2.fixed);
2181                 iov[num_iov].iov_len  = state->smb2.fixed_len;
2182                 num_iov += 1;
2183
2184                 if (state->smb2.dyn != NULL) {
2185                         iov[num_iov].iov_base = discard_const(state->smb2.dyn);
2186                         iov[num_iov].iov_len  = state->smb2.dyn_len;
2187                         num_iov += 1;
2188                 }
2189
2190                 reqlen  = sizeof(state->smb2.hdr);
2191                 reqlen += state->smb2.fixed_len;
2192                 reqlen += state->smb2.dyn_len;
2193
2194                 if (i < num_reqs-1) {
2195                         if ((reqlen % 8) > 0) {
2196                                 uint8_t pad = 8 - (reqlen % 8);
2197                                 iov[num_iov].iov_base = state->smb2.pad;
2198                                 iov[num_iov].iov_len = pad;
2199                                 num_iov += 1;
2200                                 reqlen += pad;
2201                         }
2202                         SIVAL(state->smb2.hdr, SMB2_HDR_NEXT_COMMAND, reqlen);
2203                 }
2204                 nbt_len += reqlen;
2205
2206                 if (state->session) {
2207                         should_sign = state->session->smb2.should_sign;
2208                         if (state->session->smb2.channel_setup) {
2209                                 should_sign = true;
2210                         }
2211                 }
2212
2213                 if (should_sign) {
2214                         NTSTATUS status;
2215
2216                         status = smb2_signing_sign_pdu(state->session->smb2.signing_key,
2217                                                        &iov[hdr_iov], num_iov - hdr_iov);
2218                         if (!NT_STATUS_IS_OK(status)) {
2219                                 return status;
2220                         }
2221                 }
2222
2223                 ret = smbXcli_req_set_pending(reqs[i]);
2224                 if (!ret) {
2225                         return NT_STATUS_NO_MEMORY;
2226                 }
2227         }
2228
2229         state = tevent_req_data(reqs[0], struct smbXcli_req_state);
2230         _smb_setlen_tcp(state->length_hdr, nbt_len);
2231         iov[0].iov_base = state->length_hdr;
2232         iov[0].iov_len  = sizeof(state->length_hdr);
2233
2234         if (state->conn->dispatch_incoming == NULL) {
2235                 state->conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2236         }
2237
2238         subreq = writev_send(state, state->ev, state->conn->outgoing,
2239                              state->conn->fd, false, iov, num_iov);
2240         if (subreq == NULL) {
2241                 return NT_STATUS_NO_MEMORY;
2242         }
2243         tevent_req_set_callback(subreq, smb2cli_writev_done, reqs[0]);
2244         return NT_STATUS_OK;
2245 }
2246
2247 void smb2cli_req_set_credit_charge(struct tevent_req *req, uint16_t charge)
2248 {
2249         struct smbXcli_req_state *state =
2250                 tevent_req_data(req,
2251                 struct smbXcli_req_state);
2252
2253         state->smb2.credit_charge = charge;
2254 }
2255
2256 struct tevent_req *smb2cli_req_send(TALLOC_CTX *mem_ctx,
2257                                     struct tevent_context *ev,
2258                                     struct smbXcli_conn *conn,
2259                                     uint16_t cmd,
2260                                     uint32_t additional_flags,
2261                                     uint32_t clear_flags,
2262                                     uint32_t timeout_msec,
2263                                     uint32_t pid,
2264                                     uint32_t tid,
2265                                     struct smbXcli_session *session,
2266                                     const uint8_t *fixed,
2267                                     uint16_t fixed_len,
2268                                     const uint8_t *dyn,
2269                                     uint32_t dyn_len)
2270 {
2271         struct tevent_req *req;
2272         NTSTATUS status;
2273
2274         req = smb2cli_req_create(mem_ctx, ev, conn, cmd,
2275                                  additional_flags, clear_flags,
2276                                  timeout_msec,
2277                                  pid, tid, session,
2278                                  fixed, fixed_len, dyn, dyn_len);
2279         if (req == NULL) {
2280                 return NULL;
2281         }
2282         if (!tevent_req_is_in_progress(req)) {
2283                 return tevent_req_post(req, ev);
2284         }
2285         status = smb2cli_req_compound_submit(&req, 1);
2286         if (tevent_req_nterror(req, status)) {
2287                 return tevent_req_post(req, ev);
2288         }
2289         return req;
2290 }
2291
2292 static void smb2cli_writev_done(struct tevent_req *subreq)
2293 {
2294         struct tevent_req *req =
2295                 tevent_req_callback_data(subreq,
2296                 struct tevent_req);
2297         struct smbXcli_req_state *state =
2298                 tevent_req_data(req,
2299                 struct smbXcli_req_state);
2300         ssize_t nwritten;
2301         int err;
2302
2303         nwritten = writev_recv(subreq, &err);
2304         TALLOC_FREE(subreq);
2305         if (nwritten == -1) {
2306                 /* here, we need to notify all pending requests */
2307                 NTSTATUS status = map_nt_error_from_unix_common(err);
2308                 smbXcli_conn_disconnect(state->conn, status);
2309                 return;
2310         }
2311 }
2312
2313 static NTSTATUS smb2cli_inbuf_parse_compound(uint8_t *buf, TALLOC_CTX *mem_ctx,
2314                                              struct iovec **piov, int *pnum_iov)
2315 {
2316         struct iovec *iov;
2317         int num_iov;
2318         size_t buflen;
2319         size_t taken;
2320         uint8_t *first_hdr;
2321
2322         num_iov = 0;
2323
2324         iov = talloc_array(mem_ctx, struct iovec, num_iov);
2325         if (iov == NULL) {
2326                 return NT_STATUS_NO_MEMORY;
2327         }
2328
2329         buflen = smb_len_tcp(buf);
2330         taken = 0;
2331         first_hdr = buf + NBT_HDR_SIZE;
2332
2333         while (taken < buflen) {
2334                 size_t len = buflen - taken;
2335                 uint8_t *hdr = first_hdr + taken;
2336                 struct iovec *cur;
2337                 size_t full_size;
2338                 size_t next_command_ofs;
2339                 uint16_t body_size;
2340                 struct iovec *iov_tmp;
2341
2342                 /*
2343                  * We need the header plus the body length field
2344                  */
2345
2346                 if (len < SMB2_HDR_BODY + 2) {
2347                         DEBUG(10, ("%d bytes left, expected at least %d\n",
2348                                    (int)len, SMB2_HDR_BODY));
2349                         goto inval;
2350                 }
2351                 if (IVAL(hdr, 0) != SMB2_MAGIC) {
2352                         DEBUG(10, ("Got non-SMB2 PDU: %x\n",
2353                                    IVAL(hdr, 0)));
2354                         goto inval;
2355                 }
2356                 if (SVAL(hdr, 4) != SMB2_HDR_BODY) {
2357                         DEBUG(10, ("Got HDR len %d, expected %d\n",
2358                                    SVAL(hdr, 4), SMB2_HDR_BODY));
2359                         goto inval;
2360                 }
2361
2362                 full_size = len;
2363                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
2364                 body_size = SVAL(hdr, SMB2_HDR_BODY);
2365
2366                 if (next_command_ofs != 0) {
2367                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
2368                                 goto inval;
2369                         }
2370                         if (next_command_ofs > full_size) {
2371                                 goto inval;
2372                         }
2373                         full_size = next_command_ofs;
2374                 }
2375                 if (body_size < 2) {
2376                         goto inval;
2377                 }
2378                 body_size &= 0xfffe;
2379
2380                 if (body_size > (full_size - SMB2_HDR_BODY)) {
2381                         goto inval;
2382                 }
2383
2384                 iov_tmp = talloc_realloc(mem_ctx, iov, struct iovec,
2385                                          num_iov + 3);
2386                 if (iov_tmp == NULL) {
2387                         TALLOC_FREE(iov);
2388                         return NT_STATUS_NO_MEMORY;
2389                 }
2390                 iov = iov_tmp;
2391                 cur = &iov[num_iov];
2392                 num_iov += 3;
2393
2394                 cur[0].iov_base = hdr;
2395                 cur[0].iov_len  = SMB2_HDR_BODY;
2396                 cur[1].iov_base = hdr + SMB2_HDR_BODY;
2397                 cur[1].iov_len  = body_size;
2398                 cur[2].iov_base = hdr + SMB2_HDR_BODY + body_size;
2399                 cur[2].iov_len  = full_size - (SMB2_HDR_BODY + body_size);
2400
2401                 taken += full_size;
2402         }
2403
2404         *piov = iov;
2405         *pnum_iov = num_iov;
2406         return NT_STATUS_OK;
2407
2408 inval:
2409         TALLOC_FREE(iov);
2410         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2411 }
2412
2413 static struct tevent_req *smb2cli_conn_find_pending(struct smbXcli_conn *conn,
2414                                                     uint64_t mid)
2415 {
2416         size_t num_pending = talloc_array_length(conn->pending);
2417         size_t i;
2418
2419         for (i=0; i<num_pending; i++) {
2420                 struct tevent_req *req = conn->pending[i];
2421                 struct smbXcli_req_state *state =
2422                         tevent_req_data(req,
2423                         struct smbXcli_req_state);
2424
2425                 if (mid == BVAL(state->smb2.hdr, SMB2_HDR_MESSAGE_ID)) {
2426                         return req;
2427                 }
2428         }
2429         return NULL;
2430 }
2431
2432 static NTSTATUS smb2cli_conn_dispatch_incoming(struct smbXcli_conn *conn,
2433                                                TALLOC_CTX *tmp_mem,
2434                                                uint8_t *inbuf)
2435 {
2436         struct tevent_req *req;
2437         struct smbXcli_req_state *state = NULL;
2438         struct iovec *iov;
2439         int i, num_iov;
2440         NTSTATUS status;
2441         bool defer = true;
2442         struct smbXcli_session *last_session = NULL;
2443
2444         status = smb2cli_inbuf_parse_compound(inbuf, tmp_mem,
2445                                               &iov, &num_iov);
2446         if (!NT_STATUS_IS_OK(status)) {
2447                 return status;
2448         }
2449
2450         for (i=0; i<num_iov; i+=3) {
2451                 uint8_t *inbuf_ref = NULL;
2452                 struct iovec *cur = &iov[i];
2453                 uint8_t *inhdr = (uint8_t *)cur[0].iov_base;
2454                 uint16_t opcode = SVAL(inhdr, SMB2_HDR_OPCODE);
2455                 uint32_t flags = IVAL(inhdr, SMB2_HDR_FLAGS);
2456                 uint64_t mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
2457                 uint16_t req_opcode;
2458                 uint32_t req_flags;
2459                 uint16_t credits = SVAL(inhdr, SMB2_HDR_CREDIT);
2460                 uint32_t new_credits;
2461                 struct smbXcli_session *session = NULL;
2462                 const DATA_BLOB *signing_key = NULL;
2463                 bool should_sign = false;
2464
2465                 new_credits = conn->smb2.cur_credits;
2466                 new_credits += credits;
2467                 if (new_credits > UINT16_MAX) {
2468                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2469                 }
2470                 conn->smb2.cur_credits += credits;
2471
2472                 req = smb2cli_conn_find_pending(conn, mid);
2473                 if (req == NULL) {
2474                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2475                 }
2476                 state = tevent_req_data(req, struct smbXcli_req_state);
2477
2478                 req_opcode = SVAL(state->smb2.hdr, SMB2_HDR_OPCODE);
2479                 if (opcode != req_opcode) {
2480                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2481                 }
2482                 req_flags = SVAL(state->smb2.hdr, SMB2_HDR_FLAGS);
2483
2484                 if (!(flags & SMB2_HDR_FLAG_REDIRECT)) {
2485                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
2486                 }
2487
2488                 status = NT_STATUS(IVAL(inhdr, SMB2_HDR_STATUS));
2489                 if ((flags & SMB2_HDR_FLAG_ASYNC) &&
2490                     NT_STATUS_EQUAL(status, STATUS_PENDING)) {
2491                         uint64_t async_id = BVAL(inhdr, SMB2_HDR_ASYNC_ID);
2492
2493                         /*
2494                          * async interim responses are not signed,
2495                          * even if the SMB2_HDR_FLAG_SIGNED flag
2496                          * is set.
2497                          */
2498                         req_flags |= SMB2_HDR_FLAG_ASYNC;
2499                         SBVAL(state->smb2.hdr, SMB2_HDR_FLAGS, req_flags);
2500                         SBVAL(state->smb2.hdr, SMB2_HDR_ASYNC_ID, async_id);
2501                         continue;
2502                 }
2503
2504                 session = state->session;
2505                 if (req_flags & SMB2_HDR_FLAG_CHAINED) {
2506                         session = last_session;
2507                 }
2508                 last_session = session;
2509
2510                 if (session) {
2511                         should_sign = session->smb2.should_sign;
2512                         if (session->smb2.channel_setup) {
2513                                 should_sign = true;
2514                         }
2515                 }
2516
2517                 if (should_sign) {
2518                         if (!(flags & SMB2_HDR_FLAG_SIGNED)) {
2519                                 return NT_STATUS_ACCESS_DENIED;
2520                         }
2521                 }
2522
2523                 if (flags & SMB2_HDR_FLAG_SIGNED) {
2524                         uint64_t uid = BVAL(inhdr, SMB2_HDR_SESSION_ID);
2525
2526                         if (session == NULL) {
2527                                 struct smbXcli_session *s;
2528
2529                                 s = state->conn->sessions;
2530                                 for (; s; s = s->next) {
2531                                         if (s->smb2.session_id != uid) {
2532                                                 continue;
2533                                         }
2534
2535                                         session = s;
2536                                         break;
2537                                 }
2538                         }
2539
2540                         if (session == NULL) {
2541                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2542                         }
2543
2544                         last_session = session;
2545                         signing_key = &session->smb2.signing_key;
2546                 }
2547
2548                 if ((opcode == SMB2_OP_SESSSETUP) &&
2549                      NT_STATUS_IS_OK(status)) {
2550                         /*
2551                          * the caller has to check the signing
2552                          * as only the caller knows the correct
2553                          * session key
2554                          */
2555                         signing_key = NULL;
2556                 }
2557
2558                 if (NT_STATUS_EQUAL(status, NT_STATUS_USER_SESSION_DELETED)) {
2559                         /*
2560                          * if the server returns NT_STATUS_USER_SESSION_DELETED
2561                          * the response is not signed and we should
2562                          * propagate the NT_STATUS_USER_SESSION_DELETED
2563                          * status to the caller.
2564                          */
2565                         if (signing_key) {
2566                                 signing_key = NULL;
2567                         }
2568                 }
2569
2570                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_NAME_DELETED) ||
2571                     NT_STATUS_EQUAL(status, NT_STATUS_FILE_CLOSED) ||
2572                     NT_STATUS_EQUAL(status, NT_STATUS_INVALID_PARAMETER)) {
2573                         /*
2574                          * if the server returns
2575                          * NT_STATUS_NETWORK_NAME_DELETED
2576                          * NT_STATUS_FILE_CLOSED
2577                          * NT_STATUS_INVALID_PARAMETER
2578                          * the response might not be signed
2579                          * as this happens before the signing checks.
2580                          *
2581                          * If server echos the signature (or all zeros)
2582                          * we should report the status from the server
2583                          * to the caller.
2584                          */
2585                         if (signing_key) {
2586                                 int cmp;
2587
2588                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2589                                              state->smb2.hdr+SMB2_HDR_SIGNATURE,
2590                                              16);
2591                                 if (cmp == 0) {
2592                                         state->smb2.signing_skipped = true;
2593                                         signing_key = NULL;
2594                                 }
2595                         }
2596                         if (signing_key) {
2597                                 int cmp;
2598                                 static const uint8_t zeros[16];
2599
2600                                 cmp = memcmp(inhdr+SMB2_HDR_SIGNATURE,
2601                                              zeros,
2602                                              16);
2603                                 if (cmp == 0) {
2604                                         state->smb2.signing_skipped = true;
2605                                         signing_key = NULL;
2606                                 }
2607                         }
2608                 }
2609
2610                 if (signing_key) {
2611                         status = smb2_signing_check_pdu(*signing_key, cur, 3);
2612                         if (!NT_STATUS_IS_OK(status)) {
2613                                 /*
2614                                  * If the signing check fails, we disconnect
2615                                  * the connection.
2616                                  */
2617                                 return status;
2618                         }
2619                 }
2620
2621                 smbXcli_req_unset_pending(req);
2622
2623                 /*
2624                  * There might be more than one response
2625                  * we need to defer the notifications
2626                  */
2627                 if ((num_iov == 4) && (talloc_array_length(conn->pending) == 0)) {
2628                         defer = false;
2629                 }
2630
2631                 if (defer) {
2632                         tevent_req_defer_callback(req, state->ev);
2633                 }
2634
2635                 /*
2636                  * Note: here we use talloc_reference() in a way
2637                  *       that does not expose it to the caller.
2638                  */
2639                 inbuf_ref = talloc_reference(state->smb2.recv_iov, inbuf);
2640                 if (tevent_req_nomem(inbuf_ref, req)) {
2641                         continue;
2642                 }
2643
2644                 /* copy the related buffers */
2645                 state->smb2.recv_iov[0] = cur[0];
2646                 state->smb2.recv_iov[1] = cur[1];
2647                 state->smb2.recv_iov[2] = cur[2];
2648
2649                 tevent_req_done(req);
2650         }
2651
2652         if (defer) {
2653                 return NT_STATUS_RETRY;
2654         }
2655
2656         return NT_STATUS_OK;
2657 }
2658
2659 NTSTATUS smb2cli_req_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
2660                           struct iovec **piov,
2661                           const struct smb2cli_req_expected_response *expected,
2662                           size_t num_expected)
2663 {
2664         struct smbXcli_req_state *state =
2665                 tevent_req_data(req,
2666                 struct smbXcli_req_state);
2667         NTSTATUS status;
2668         size_t body_size;
2669         bool found_status = false;
2670         bool found_size = false;
2671         size_t i;
2672
2673         if (piov != NULL) {
2674                 *piov = NULL;
2675         }
2676
2677         if (tevent_req_is_nterror(req, &status)) {
2678                 for (i=0; i < num_expected; i++) {
2679                         if (NT_STATUS_EQUAL(status, expected[i].status)) {
2680                                 found_status = true;
2681                                 break;
2682                         }
2683                 }
2684
2685                 if (found_status) {
2686                         return NT_STATUS_UNEXPECTED_NETWORK_ERROR;
2687                 }
2688
2689                 return status;
2690         }
2691
2692         if (num_expected == 0) {
2693                 found_status = true;
2694                 found_size = true;
2695         }
2696
2697         status = NT_STATUS(IVAL(state->smb2.recv_iov[0].iov_base, SMB2_HDR_STATUS));
2698         body_size = SVAL(state->smb2.recv_iov[1].iov_base, 0);
2699
2700         for (i=0; i < num_expected; i++) {
2701                 if (!NT_STATUS_EQUAL(status, expected[i].status)) {
2702                         continue;
2703                 }
2704
2705                 found_status = true;
2706                 if (expected[i].body_size == 0) {
2707                         found_size = true;
2708                         break;
2709                 }
2710
2711                 if (expected[i].body_size == body_size) {
2712                         found_size = true;
2713                         break;
2714                 }
2715         }
2716
2717         if (!found_status) {
2718                 return status;
2719         }
2720
2721         if (state->smb2.signing_skipped) {
2722                 if (num_expected > 0) {
2723                         return NT_STATUS_ACCESS_DENIED;
2724                 }
2725                 if (!NT_STATUS_IS_ERR(status)) {
2726                         return NT_STATUS_ACCESS_DENIED;
2727                 }
2728         }
2729
2730         if (!found_size) {
2731                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
2732         }
2733
2734         if (piov != NULL) {
2735                 *piov = talloc_move(mem_ctx, &state->smb2.recv_iov);
2736         }
2737
2738         return status;
2739 }
2740
2741 static const struct {
2742         enum protocol_types proto;
2743         const char *smb1_name;
2744 } smb1cli_prots[] = {
2745         {PROTOCOL_CORE,         "PC NETWORK PROGRAM 1.0"},
2746         {PROTOCOL_COREPLUS,     "MICROSOFT NETWORKS 1.03"},
2747         {PROTOCOL_LANMAN1,      "MICROSOFT NETWORKS 3.0"},
2748         {PROTOCOL_LANMAN1,      "LANMAN1.0"},
2749         {PROTOCOL_LANMAN2,      "LM1.2X002"},
2750         {PROTOCOL_LANMAN2,      "DOS LANMAN2.1"},
2751         {PROTOCOL_LANMAN2,      "LANMAN2.1"},
2752         {PROTOCOL_LANMAN2,      "Samba"},
2753         {PROTOCOL_NT1,          "NT LANMAN 1.0"},
2754         {PROTOCOL_NT1,          "NT LM 0.12"},
2755         {PROTOCOL_SMB2_02,      "SMB 2.002"},
2756         {PROTOCOL_SMB2_10,      "SMB 2.???"},
2757 };
2758
2759 static const struct {
2760         enum protocol_types proto;
2761         uint16_t smb2_dialect;
2762 } smb2cli_prots[] = {
2763         {PROTOCOL_SMB2_02,      SMB2_DIALECT_REVISION_202},
2764         {PROTOCOL_SMB2_10,      SMB2_DIALECT_REVISION_210},
2765         {PROTOCOL_SMB2_22,      SMB2_DIALECT_REVISION_222},
2766 };
2767
2768 struct smbXcli_negprot_state {
2769         struct smbXcli_conn *conn;
2770         struct tevent_context *ev;
2771         uint32_t timeout_msec;
2772         enum protocol_types min_protocol;
2773         enum protocol_types max_protocol;
2774
2775         struct {
2776                 uint8_t fixed[36];
2777                 uint8_t dyn[ARRAY_SIZE(smb2cli_prots)*2];
2778         } smb2;
2779 };
2780
2781 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq);
2782 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state);
2783 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq);
2784 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state);
2785 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq);
2786 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
2787                                                   TALLOC_CTX *frame,
2788                                                   uint8_t *inbuf);
2789
2790 struct tevent_req *smbXcli_negprot_send(TALLOC_CTX *mem_ctx,
2791                                         struct tevent_context *ev,
2792                                         struct smbXcli_conn *conn,
2793                                         uint32_t timeout_msec,
2794                                         enum protocol_types min_protocol,
2795                                         enum protocol_types max_protocol)
2796 {
2797         struct tevent_req *req, *subreq;
2798         struct smbXcli_negprot_state *state;
2799
2800         req = tevent_req_create(mem_ctx, &state,
2801                                 struct smbXcli_negprot_state);
2802         if (req == NULL) {
2803                 return NULL;
2804         }
2805         state->conn = conn;
2806         state->ev = ev;
2807         state->timeout_msec = timeout_msec;
2808         state->min_protocol = min_protocol;
2809         state->max_protocol = max_protocol;
2810
2811         if (min_protocol == PROTOCOL_NONE) {
2812                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2813                 return tevent_req_post(req, ev);
2814         }
2815
2816         if (max_protocol == PROTOCOL_NONE) {
2817                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2818                 return tevent_req_post(req, ev);
2819         }
2820
2821         if (min_protocol > max_protocol) {
2822                 tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
2823                 return tevent_req_post(req, ev);
2824         }
2825
2826         if ((min_protocol < PROTOCOL_SMB2_02) &&
2827             (max_protocol < PROTOCOL_SMB2_02)) {
2828                 /*
2829                  * SMB1 only...
2830                  */
2831                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
2832
2833                 subreq = smbXcli_negprot_smb1_subreq(state);
2834                 if (tevent_req_nomem(subreq, req)) {
2835                         return tevent_req_post(req, ev);
2836                 }
2837                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
2838                 return req;
2839         }
2840
2841         if ((min_protocol >= PROTOCOL_SMB2_02) &&
2842             (max_protocol >= PROTOCOL_SMB2_02)) {
2843                 /*
2844                  * SMB2 only...
2845                  */
2846                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
2847
2848                 subreq = smbXcli_negprot_smb2_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_smb2_done, req);
2853                 return req;
2854         }
2855
2856         /*
2857          * We send an SMB1 negprot with the SMB2 dialects
2858          * and expect a SMB1 or a SMB2 response.
2859          *
2860          * smbXcli_negprot_dispatch_incoming() will fix the
2861          * callback to match protocol of the response.
2862          */
2863         conn->dispatch_incoming = smbXcli_negprot_dispatch_incoming;
2864
2865         subreq = smbXcli_negprot_smb1_subreq(state);
2866         if (tevent_req_nomem(subreq, req)) {
2867                 return tevent_req_post(req, ev);
2868         }
2869         tevent_req_set_callback(subreq, smbXcli_negprot_invalid_done, req);
2870         return req;
2871 }
2872
2873 static void smbXcli_negprot_invalid_done(struct tevent_req *subreq)
2874 {
2875         struct tevent_req *req =
2876                 tevent_req_callback_data(subreq,
2877                 struct tevent_req);
2878         NTSTATUS status;
2879
2880         /*
2881          * we just want the low level error
2882          */
2883         status = tevent_req_simple_recv_ntstatus(subreq);
2884         TALLOC_FREE(subreq);
2885         if (tevent_req_nterror(req, status)) {
2886                 return;
2887         }
2888
2889         /* this should never happen */
2890         tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
2891 }
2892
2893 static struct tevent_req *smbXcli_negprot_smb1_subreq(struct smbXcli_negprot_state *state)
2894 {
2895         size_t i;
2896         DATA_BLOB bytes = data_blob_null;
2897         uint8_t flags;
2898         uint16_t flags2;
2899
2900         /* setup the protocol strings */
2901         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
2902                 uint8_t c = 2;
2903                 bool ok;
2904
2905                 if (smb1cli_prots[i].proto < state->min_protocol) {
2906                         continue;
2907                 }
2908
2909                 if (smb1cli_prots[i].proto > state->max_protocol) {
2910                         continue;
2911                 }
2912
2913                 ok = data_blob_append(state, &bytes, &c, sizeof(c));
2914                 if (!ok) {
2915                         return NULL;
2916                 }
2917
2918                 /*
2919                  * We now it is already ascii and
2920                  * we want NULL termination.
2921                  */
2922                 ok = data_blob_append(state, &bytes,
2923                                       smb1cli_prots[i].smb1_name,
2924                                       strlen(smb1cli_prots[i].smb1_name)+1);
2925                 if (!ok) {
2926                         return NULL;
2927                 }
2928         }
2929
2930         smb1cli_req_flags(state->max_protocol,
2931                           state->conn->smb1.client.capabilities,
2932                           SMBnegprot,
2933                           0, 0, &flags,
2934                           0, 0, &flags2);
2935
2936         return smb1cli_req_send(state, state->ev, state->conn,
2937                                 SMBnegprot,
2938                                 flags, ~flags,
2939                                 flags2, ~flags2,
2940                                 state->timeout_msec,
2941                                 0xFFFE, 0, 0, /* pid, tid, uid */
2942                                 0, NULL, /* wct, vwv */
2943                                 bytes.length, bytes.data);
2944 }
2945
2946 static void smbXcli_negprot_smb1_done(struct tevent_req *subreq)
2947 {
2948         struct tevent_req *req =
2949                 tevent_req_callback_data(subreq,
2950                 struct tevent_req);
2951         struct smbXcli_negprot_state *state =
2952                 tevent_req_data(req,
2953                 struct smbXcli_negprot_state);
2954         struct smbXcli_conn *conn = state->conn;
2955         struct iovec *recv_iov = NULL;
2956         uint8_t *inhdr;
2957         uint8_t wct;
2958         uint16_t *vwv;
2959         uint32_t num_bytes;
2960         uint8_t *bytes;
2961         NTSTATUS status;
2962         uint16_t protnum;
2963         size_t i;
2964         size_t num_prots = 0;
2965         uint8_t flags;
2966         uint32_t client_capabilities = conn->smb1.client.capabilities;
2967         uint32_t both_capabilities;
2968         uint32_t server_capabilities = 0;
2969         uint32_t capabilities;
2970         uint32_t client_max_xmit = conn->smb1.client.max_xmit;
2971         uint32_t server_max_xmit = 0;
2972         uint32_t max_xmit;
2973         uint32_t server_max_mux = 0;
2974         uint16_t server_security_mode = 0;
2975         uint32_t server_session_key = 0;
2976         bool server_readbraw = false;
2977         bool server_writebraw = false;
2978         bool server_lockread = false;
2979         bool server_writeunlock = false;
2980         struct GUID server_guid = GUID_zero();
2981         DATA_BLOB server_gss_blob = data_blob_null;
2982         uint8_t server_challenge[8];
2983         char *server_workgroup = NULL;
2984         char *server_name = NULL;
2985         int server_time_zone = 0;
2986         NTTIME server_system_time = 0;
2987         static const struct smb1cli_req_expected_response expected[] = {
2988         {
2989                 .status = NT_STATUS_OK,
2990                 .wct = 0x11, /* NT1 */
2991         },
2992         {
2993                 .status = NT_STATUS_OK,
2994                 .wct = 0x0D, /* LM */
2995         },
2996         {
2997                 .status = NT_STATUS_OK,
2998                 .wct = 0x01, /* CORE */
2999         }
3000         };
3001
3002         ZERO_STRUCT(server_challenge);
3003
3004         status = smb1cli_req_recv(subreq, state,
3005                                   &recv_iov,
3006                                   &inhdr,
3007                                   &wct,
3008                                   &vwv,
3009                                   NULL, /* pvwv_offset */
3010                                   &num_bytes,
3011                                   &bytes,
3012                                   NULL, /* pbytes_offset */
3013                                   NULL, /* pinbuf */
3014                                   expected, ARRAY_SIZE(expected));
3015         TALLOC_FREE(subreq);
3016         if (tevent_req_nterror(req, status)) {
3017                 return;
3018         }
3019
3020         flags = CVAL(inhdr, HDR_FLG);
3021
3022         protnum = SVAL(vwv, 0);
3023
3024         for (i=0; i < ARRAY_SIZE(smb1cli_prots); i++) {
3025                 if (smb1cli_prots[i].proto < state->min_protocol) {
3026                         continue;
3027                 }
3028
3029                 if (smb1cli_prots[i].proto > state->max_protocol) {
3030                         continue;
3031                 }
3032
3033                 if (protnum != num_prots) {
3034                         num_prots++;
3035                         continue;
3036                 }
3037
3038                 conn->protocol = smb1cli_prots[i].proto;
3039                 break;
3040         }
3041
3042         if (conn->protocol == PROTOCOL_NONE) {
3043                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3044                 return;
3045         }
3046
3047         if ((conn->protocol < PROTOCOL_NT1) && conn->mandatory_signing) {
3048                 DEBUG(0,("smbXcli_negprot: SMB signing is mandatory "
3049                          "and the selected protocol level doesn't support it.\n"));
3050                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3051                 return;
3052         }
3053
3054         if (flags & FLAG_SUPPORT_LOCKREAD) {
3055                 server_lockread = true;
3056                 server_writeunlock = true;
3057         }
3058
3059         if (conn->protocol >= PROTOCOL_NT1) {
3060                 const char *client_signing = NULL;
3061                 bool server_mandatory = false;
3062                 bool server_allowed = false;
3063                 const char *server_signing = NULL;
3064                 bool ok;
3065                 uint8_t key_len;
3066
3067                 if (wct != 0x11) {
3068                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3069                         return;
3070                 }
3071
3072                 /* NT protocol */
3073                 server_security_mode = CVAL(vwv + 1, 0);
3074                 server_max_mux = SVAL(vwv + 1, 1);
3075                 server_max_xmit = IVAL(vwv + 3, 1);
3076                 server_session_key = IVAL(vwv + 7, 1);
3077                 server_time_zone = SVALS(vwv + 15, 1);
3078                 server_time_zone *= 60;
3079                 /* this time arrives in real GMT */
3080                 server_system_time = BVAL(vwv + 11, 1);
3081                 server_capabilities = IVAL(vwv + 9, 1);
3082
3083                 key_len = CVAL(vwv + 16, 1);
3084
3085                 if (server_capabilities & CAP_RAW_MODE) {
3086                         server_readbraw = true;
3087                         server_writebraw = true;
3088                 }
3089                 if (server_capabilities & CAP_LOCK_AND_READ) {
3090                         server_lockread = true;
3091                 }
3092
3093                 if (server_capabilities & CAP_EXTENDED_SECURITY) {
3094                         DATA_BLOB blob1, blob2;
3095
3096                         if (num_bytes < 16) {
3097                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3098                                 return;
3099                         }
3100
3101                         blob1 = data_blob_const(bytes, 16);
3102                         status = GUID_from_data_blob(&blob1, &server_guid);
3103                         if (tevent_req_nterror(req, status)) {
3104                                 return;
3105                         }
3106
3107                         blob1 = data_blob_const(bytes+16, num_bytes-16);
3108                         blob2 = data_blob_dup_talloc(state, blob1);
3109                         if (blob1.length > 0 &&
3110                             tevent_req_nomem(blob2.data, req)) {
3111                                 return;
3112                         }
3113                         server_gss_blob = blob2;
3114                 } else {
3115                         DATA_BLOB blob1, blob2;
3116
3117                         if (num_bytes < key_len) {
3118                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3119                                 return;
3120                         }
3121
3122                         if (key_len != 0 && key_len != 8) {
3123                                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3124                                 return;
3125                         }
3126
3127                         if (key_len == 8) {
3128                                 memcpy(server_challenge, bytes, 8);
3129                         }
3130
3131                         blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3132                         blob2 = data_blob_const(bytes+key_len, num_bytes-key_len);
3133                         if (blob1.length > 0) {
3134                                 size_t len;
3135
3136                                 len = utf16_len_n(blob1.data,
3137                                                   blob1.length);
3138                                 blob1.length = len;
3139
3140                                 ok = convert_string_talloc(state,
3141                                                            CH_UTF16LE,
3142                                                            CH_UNIX,
3143                                                            blob1.data,
3144                                                            blob1.length,
3145                                                            &server_workgroup,
3146                                                            &len);
3147                                 if (!ok) {
3148                                         status = map_nt_error_from_unix_common(errno);
3149                                         tevent_req_nterror(req, status);
3150                                         return;
3151                                 }
3152                         }
3153
3154                         blob2.data += blob1.length;
3155                         blob2.length -= blob1.length;
3156                         if (blob2.length > 0) {
3157                                 size_t len;
3158
3159                                 len = utf16_len_n(blob1.data,
3160                                                   blob1.length);
3161                                 blob1.length = len;
3162
3163                                 ok = convert_string_talloc(state,
3164                                                            CH_UTF16LE,
3165                                                            CH_UNIX,
3166                                                            blob2.data,
3167                                                            blob2.length,
3168                                                            &server_name,
3169                                                            &len);
3170                                 if (!ok) {
3171                                         status = map_nt_error_from_unix_common(errno);
3172                                         tevent_req_nterror(req, status);
3173                                         return;
3174                                 }
3175                         }
3176                 }
3177
3178                 client_signing = "disabled";
3179                 if (conn->allow_signing) {
3180                         client_signing = "allowed";
3181                 }
3182                 if (conn->mandatory_signing) {
3183                         client_signing = "required";
3184                 }
3185
3186                 server_signing = "not supported";
3187                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_ENABLED) {
3188                         server_signing = "supported";
3189                         server_allowed = true;
3190                 }
3191                 if (server_security_mode & NEGOTIATE_SECURITY_SIGNATURES_REQUIRED) {
3192                         server_signing = "required";
3193                         server_mandatory = true;
3194                 }
3195
3196                 ok = smb_signing_set_negotiated(conn->smb1.signing,
3197                                                 server_allowed,
3198                                                 server_mandatory);
3199                 if (!ok) {
3200                         DEBUG(1,("cli_negprot: SMB signing is required, "
3201                                  "but client[%s] and server[%s] mismatch\n",
3202                                  client_signing, server_signing));
3203                         tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
3204                         return;
3205                 }
3206
3207         } else if (conn->protocol >= PROTOCOL_LANMAN1) {
3208                 DATA_BLOB blob1;
3209                 uint8_t key_len;
3210                 time_t t;
3211
3212                 if (wct != 0x0D) {
3213                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3214                         return;
3215                 }
3216
3217                 server_security_mode = SVAL(vwv + 1, 0);
3218                 server_max_xmit = SVAL(vwv + 2, 0);
3219                 server_max_mux = SVAL(vwv + 3, 0);
3220                 server_readbraw = ((SVAL(vwv + 5, 0) & 0x1) != 0);
3221                 server_writebraw = ((SVAL(vwv + 5, 0) & 0x2) != 0);
3222                 server_session_key = IVAL(vwv + 6, 0);
3223                 server_time_zone = SVALS(vwv + 10, 0);
3224                 server_time_zone *= 60;
3225                 /* this time is converted to GMT by make_unix_date */
3226                 t = pull_dos_date((const uint8_t *)(vwv + 8), server_time_zone);
3227                 unix_to_nt_time(&server_system_time, t);
3228                 key_len = SVAL(vwv + 11, 0);
3229
3230                 if (num_bytes < key_len) {
3231                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3232                         return;
3233                 }
3234
3235                 if (key_len != 0 && key_len != 8) {
3236                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3237                         return;
3238                 }
3239
3240                 if (key_len == 8) {
3241                         memcpy(server_challenge, bytes, 8);
3242                 }
3243
3244                 blob1 = data_blob_const(bytes+key_len, num_bytes-key_len);
3245                 if (blob1.length > 0) {
3246                         size_t len;
3247                         bool ok;
3248
3249                         len = utf16_len_n(blob1.data,
3250                                           blob1.length);
3251                         blob1.length = len;
3252
3253                         ok = convert_string_talloc(state,
3254                                                    CH_DOS,
3255                                                    CH_UNIX,
3256                                                    blob1.data,
3257                                                    blob1.length,
3258                                                    &server_workgroup,
3259                                                    &len);
3260                         if (!ok) {
3261                                 status = map_nt_error_from_unix_common(errno);
3262                                 tevent_req_nterror(req, status);
3263                                 return;
3264                         }
3265                 }
3266
3267         } else {
3268                 /* the old core protocol */
3269                 server_time_zone = get_time_zone(time(NULL));
3270                 server_max_xmit = 1024;
3271                 server_max_mux = 1;
3272         }
3273
3274         if (server_max_xmit < 1024) {
3275                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3276                 return;
3277         }
3278
3279         if (server_max_mux < 1) {
3280                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3281                 return;
3282         }
3283
3284         /*
3285          * Now calculate the negotiated capabilities
3286          * based on the mask for:
3287          * - client only flags
3288          * - flags used in both directions
3289          * - server only flags
3290          */
3291         both_capabilities = client_capabilities & server_capabilities;
3292         capabilities = client_capabilities & SMB_CAP_CLIENT_MASK;
3293         capabilities |= both_capabilities & SMB_CAP_BOTH_MASK;
3294         capabilities |= server_capabilities & SMB_CAP_SERVER_MASK;
3295
3296         max_xmit = MIN(client_max_xmit, server_max_xmit);
3297
3298         conn->smb1.server.capabilities = server_capabilities;
3299         conn->smb1.capabilities = capabilities;
3300
3301         conn->smb1.server.max_xmit = server_max_xmit;
3302         conn->smb1.max_xmit = max_xmit;
3303
3304         conn->smb1.server.max_mux = server_max_mux;
3305
3306         conn->smb1.server.security_mode = server_security_mode;
3307
3308         conn->smb1.server.readbraw = server_readbraw;
3309         conn->smb1.server.writebraw = server_writebraw;
3310         conn->smb1.server.lockread = server_lockread;
3311         conn->smb1.server.writeunlock = server_writeunlock;
3312
3313         conn->smb1.server.session_key = server_session_key;
3314
3315         talloc_steal(conn, server_gss_blob.data);
3316         conn->smb1.server.gss_blob = server_gss_blob;
3317         conn->smb1.server.guid = server_guid;
3318         memcpy(conn->smb1.server.challenge, server_challenge, 8);
3319         conn->smb1.server.workgroup = talloc_move(conn, &server_workgroup);
3320         conn->smb1.server.name = talloc_move(conn, &server_name);
3321
3322         conn->smb1.server.time_zone = server_time_zone;
3323         conn->smb1.server.system_time = server_system_time;
3324
3325         tevent_req_done(req);
3326 }
3327
3328 static struct tevent_req *smbXcli_negprot_smb2_subreq(struct smbXcli_negprot_state *state)
3329 {
3330         size_t i;
3331         uint8_t *buf;
3332         uint16_t dialect_count = 0;
3333
3334         buf = state->smb2.dyn;
3335         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3336                 if (smb2cli_prots[i].proto < state->min_protocol) {
3337                         continue;
3338                 }
3339
3340                 if (smb2cli_prots[i].proto > state->max_protocol) {
3341                         continue;
3342                 }
3343
3344                 SSVAL(buf, dialect_count*2, smb2cli_prots[i].smb2_dialect);
3345                 dialect_count++;
3346         }
3347
3348         buf = state->smb2.fixed;
3349         SSVAL(buf, 0, 36);
3350         SSVAL(buf, 2, dialect_count);
3351         SSVAL(buf, 4, state->conn->smb2.client.security_mode);
3352         SSVAL(buf, 6, 0);       /* Reserved */
3353         SSVAL(buf, 8, 0);       /* Capabilities */
3354         if (state->max_protocol >= PROTOCOL_SMB2_10) {
3355                 NTSTATUS status;
3356                 DATA_BLOB blob;
3357
3358                 status = GUID_to_ndr_blob(&state->conn->smb2.client.guid,
3359                                           state, &blob);
3360                 if (!NT_STATUS_IS_OK(status)) {
3361                         return NULL;
3362                 }
3363                 memcpy(buf+12, blob.data, 16); /* ClientGuid */
3364         } else {
3365                 memset(buf+12, 0, 16);  /* ClientGuid */
3366         }
3367         SBVAL(buf, 28, 0);      /* ClientStartTime */
3368
3369         return smb2cli_req_send(state, state->ev,
3370                                 state->conn, SMB2_OP_NEGPROT,
3371                                 0, 0, /* flags */
3372                                 state->timeout_msec,
3373                                 0xFEFF, 0, NULL, /* pid, tid, session */
3374                                 state->smb2.fixed, sizeof(state->smb2.fixed),
3375                                 state->smb2.dyn, dialect_count*2);
3376 }
3377
3378 static void smbXcli_negprot_smb2_done(struct tevent_req *subreq)
3379 {
3380         struct tevent_req *req =
3381                 tevent_req_callback_data(subreq,
3382                 struct tevent_req);
3383         struct smbXcli_negprot_state *state =
3384                 tevent_req_data(req,
3385                 struct smbXcli_negprot_state);
3386         struct smbXcli_conn *conn = state->conn;
3387         size_t security_offset, security_length;
3388         DATA_BLOB blob;
3389         NTSTATUS status;
3390         struct iovec *iov;
3391         uint8_t *body;
3392         size_t i;
3393         uint16_t dialect_revision;
3394         static const struct smb2cli_req_expected_response expected[] = {
3395         {
3396                 .status = NT_STATUS_OK,
3397                 .body_size = 0x41
3398         }
3399         };
3400
3401         status = smb2cli_req_recv(subreq, state, &iov,
3402                                   expected, ARRAY_SIZE(expected));
3403         TALLOC_FREE(subreq);
3404         if (tevent_req_nterror(req, status)) {
3405                 return;
3406         }
3407
3408         body = (uint8_t *)iov[1].iov_base;
3409
3410         dialect_revision = SVAL(body, 4);
3411
3412         for (i=0; i < ARRAY_SIZE(smb2cli_prots); i++) {
3413                 if (smb2cli_prots[i].proto < state->min_protocol) {
3414                         continue;
3415                 }
3416
3417                 if (smb2cli_prots[i].proto > state->max_protocol) {
3418                         continue;
3419                 }
3420
3421                 if (smb2cli_prots[i].smb2_dialect != dialect_revision) {
3422                         continue;
3423                 }
3424
3425                 conn->protocol = smb2cli_prots[i].proto;
3426                 break;
3427         }
3428
3429         if (conn->protocol == PROTOCOL_NONE) {
3430                 if (state->min_protocol >= PROTOCOL_SMB2_02) {
3431                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3432                         return;
3433                 }
3434
3435                 if (dialect_revision != SMB2_DIALECT_REVISION_2FF) {
3436                         tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3437                         return;
3438                 }
3439
3440                 /* make sure we do not loop forever */
3441                 state->min_protocol = PROTOCOL_SMB2_02;
3442
3443                 /*
3444                  * send a SMB2 negprot, in order to negotiate
3445                  * the SMB2 dialect. This needs to use the
3446                  * message id 1.
3447                  */
3448                 state->conn->smb2.mid = 1;
3449                 subreq = smbXcli_negprot_smb2_subreq(state);
3450                 if (tevent_req_nomem(subreq, req)) {
3451                         return;
3452                 }
3453                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3454                 return;
3455         }
3456
3457         conn->smb2.server.security_mode = SVAL(body, 2);
3458
3459         blob = data_blob_const(body + 8, 16);
3460         status = GUID_from_data_blob(&blob, &conn->smb2.server.guid);
3461         if (tevent_req_nterror(req, status)) {
3462                 return;
3463         }
3464
3465         conn->smb2.server.capabilities  = IVAL(body, 24);
3466         conn->smb2.server.max_trans_size= IVAL(body, 28);
3467         conn->smb2.server.max_read_size = IVAL(body, 32);
3468         conn->smb2.server.max_write_size= IVAL(body, 36);
3469         conn->smb2.server.system_time   = BVAL(body, 40);
3470         conn->smb2.server.start_time    = BVAL(body, 48);
3471
3472         security_offset = SVAL(body, 56);
3473         security_length = SVAL(body, 58);
3474
3475         if (security_offset != SMB2_HDR_BODY + iov[1].iov_len) {
3476                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3477                 return;
3478         }
3479
3480         if (security_length > iov[2].iov_len) {
3481                 tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
3482                 return;
3483         }
3484
3485         conn->smb2.server.gss_blob = data_blob_talloc(conn,
3486                                                 iov[2].iov_base,
3487                                                 security_length);
3488         if (tevent_req_nomem(conn->smb2.server.gss_blob.data, req)) {
3489                 return;
3490         }
3491
3492         tevent_req_done(req);
3493 }
3494
3495 static NTSTATUS smbXcli_negprot_dispatch_incoming(struct smbXcli_conn *conn,
3496                                                   TALLOC_CTX *tmp_mem,
3497                                                   uint8_t *inbuf)
3498 {
3499         size_t num_pending = talloc_array_length(conn->pending);
3500         struct tevent_req *subreq;
3501         struct smbXcli_req_state *substate;
3502         struct tevent_req *req;
3503         struct smbXcli_negprot_state *state;
3504         uint32_t protocol_magic = IVAL(inbuf, 4);
3505
3506         if (num_pending != 1) {
3507                 return NT_STATUS_INTERNAL_ERROR;
3508         }
3509
3510         subreq = conn->pending[0];
3511         substate = tevent_req_data(subreq, struct smbXcli_req_state);
3512         req = tevent_req_callback_data(subreq, struct tevent_req);
3513         state = tevent_req_data(req, struct smbXcli_negprot_state);
3514
3515         switch (protocol_magic) {
3516         case SMB_MAGIC:
3517                 tevent_req_set_callback(subreq, smbXcli_negprot_smb1_done, req);
3518                 conn->dispatch_incoming = smb1cli_conn_dispatch_incoming;
3519                 return smb1cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3520
3521         case SMB2_MAGIC:
3522                 if (substate->smb2.recv_iov == NULL) {
3523                         /*
3524                          * For the SMB1 negprot we have move it.
3525                          */
3526                         substate->smb2.recv_iov = substate->smb1.recv_iov;
3527                         substate->smb1.recv_iov = NULL;
3528                 }
3529
3530                 tevent_req_set_callback(subreq, smbXcli_negprot_smb2_done, req);
3531                 conn->dispatch_incoming = smb2cli_conn_dispatch_incoming;
3532                 return smb2cli_conn_dispatch_incoming(conn, tmp_mem, inbuf);
3533         }
3534
3535         DEBUG(10, ("Got non-SMB PDU\n"));
3536         return NT_STATUS_INVALID_NETWORK_RESPONSE;
3537 }
3538
3539 NTSTATUS smbXcli_negprot_recv(struct tevent_req *req)
3540 {
3541         return tevent_req_simple_recv_ntstatus(req);
3542 }
3543
3544 NTSTATUS smbXcli_negprot(struct smbXcli_conn *conn,
3545                          uint32_t timeout_msec,
3546                          enum protocol_types min_protocol,
3547                          enum protocol_types max_protocol)
3548 {
3549         TALLOC_CTX *frame = talloc_stackframe();
3550         struct tevent_context *ev;
3551         struct tevent_req *req;
3552         NTSTATUS status = NT_STATUS_NO_MEMORY;
3553         bool ok;
3554
3555         if (smbXcli_conn_has_async_calls(conn)) {
3556                 /*
3557                  * Can't use sync call while an async call is in flight
3558                  */
3559                 status = NT_STATUS_INVALID_PARAMETER_MIX;
3560                 goto fail;
3561         }
3562         ev = tevent_context_init(frame);
3563         if (ev == NULL) {
3564                 goto fail;
3565         }
3566         req = smbXcli_negprot_send(frame, ev, conn, timeout_msec,
3567                                    min_protocol, max_protocol);
3568         if (req == NULL) {
3569                 goto fail;
3570         }
3571         ok = tevent_req_poll(req, ev);
3572         if (!ok) {
3573                 status = map_nt_error_from_unix_common(errno);
3574                 goto fail;
3575         }
3576         status = smbXcli_negprot_recv(req);
3577  fail:
3578         TALLOC_FREE(frame);
3579         return status;
3580 }
3581
3582 static int smbXcli_session_destructor(struct smbXcli_session *session)
3583 {
3584         if (session->conn == NULL) {
3585                 return 0;
3586         }
3587
3588         DLIST_REMOVE(session->conn->sessions, session);
3589         return 0;
3590 }
3591
3592 struct smbXcli_session *smbXcli_session_create(TALLOC_CTX *mem_ctx,
3593                                                struct smbXcli_conn *conn)
3594 {
3595         struct smbXcli_session *session;
3596
3597         session = talloc_zero(mem_ctx, struct smbXcli_session);
3598         if (session == NULL) {
3599                 return NULL;
3600         }
3601         talloc_set_destructor(session, smbXcli_session_destructor);
3602
3603         DLIST_ADD_END(conn->sessions, session, struct smbXcli_session *);
3604         session->conn = conn;
3605
3606         return session;
3607 }
3608
3609 uint8_t smb2cli_session_security_mode(struct smbXcli_session *session)
3610 {
3611         struct smbXcli_conn *conn = session->conn;
3612         uint8_t security_mode = 0;
3613
3614         if (conn == NULL) {
3615                 return security_mode;
3616         }
3617
3618         security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
3619         if (conn->mandatory_signing) {
3620                 security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
3621         }
3622
3623         return security_mode;
3624 }
3625
3626 uint64_t smb2cli_session_current_id(struct smbXcli_session *session)
3627 {
3628         return session->smb2.session_id;
3629 }
3630
3631 void smb2cli_session_set_id_and_flags(struct smbXcli_session *session,
3632                                       uint64_t session_id,
3633                                       uint16_t session_flags)
3634 {
3635         session->smb2.session_id = session_id;
3636         session->smb2.session_flags = session_flags;
3637 }
3638
3639 NTSTATUS smb2cli_session_update_session_key(struct smbXcli_session *session,
3640                                             const DATA_BLOB session_key,
3641                                             const struct iovec *recv_iov)
3642 {
3643         struct smbXcli_conn *conn = session->conn;
3644         uint16_t no_sign_flags;
3645         DATA_BLOB signing_key;
3646         NTSTATUS status;
3647
3648         if (conn == NULL) {
3649                 return NT_STATUS_INVALID_PARAMETER_MIX;
3650         }
3651
3652         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
3653
3654         if (session->smb2.session_flags & no_sign_flags) {
3655                 session->smb2.should_sign = false;
3656                 return NT_STATUS_OK;
3657         }
3658
3659         if (session->smb2.signing_key.length > 0) {
3660                 signing_key = session->smb2.signing_key;
3661         } else {
3662                 signing_key = session_key;
3663         }
3664         if (session->smb2.channel_setup) {
3665                 signing_key = session_key;
3666         }
3667
3668         status = smb2_signing_check_pdu(signing_key, recv_iov, 3);
3669         if (!NT_STATUS_IS_OK(status)) {
3670                 return status;
3671         }
3672
3673         if (!session->smb2.channel_setup) {
3674                 session->smb2.session_key = data_blob_dup_talloc(session,
3675                                                                  session_key);
3676                 if (session->smb2.session_key.data == NULL) {
3677                         return NT_STATUS_NO_MEMORY;
3678                 }
3679         }
3680
3681         if (session->smb2.channel_setup) {
3682                 data_blob_free(&session->smb2.signing_key);
3683                 session->smb2.channel_setup = false;
3684         }
3685
3686         if (session->smb2.signing_key.length > 0) {
3687                 return NT_STATUS_OK;
3688         }
3689
3690         session->smb2.signing_key = data_blob_dup_talloc(session, signing_key);
3691         if (session->smb2.signing_key.data == NULL) {
3692                 return NT_STATUS_NO_MEMORY;
3693         }
3694
3695         session->smb2.should_sign = false;
3696
3697         if (conn->desire_signing) {
3698                 session->smb2.should_sign = true;
3699         }
3700
3701         if (conn->smb2.server.security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
3702                 session->smb2.should_sign = true;
3703         }
3704
3705         return NT_STATUS_OK;
3706 }
3707
3708 NTSTATUS smb2cli_session_create_channel(TALLOC_CTX *mem_ctx,
3709                                         struct smbXcli_session *session1,
3710                                         struct smbXcli_conn *conn,
3711                                         struct smbXcli_session **_session2)
3712 {
3713         struct smbXcli_session *session2;
3714         uint16_t no_sign_flags;
3715
3716         no_sign_flags = SMB2_SESSION_FLAG_IS_GUEST | SMB2_SESSION_FLAG_IS_NULL;
3717
3718         if (session1->smb2.session_flags & no_sign_flags) {
3719                 return NT_STATUS_INVALID_PARAMETER_MIX;
3720         }
3721
3722         if (session1->smb2.session_key.length == 0) {
3723                 return NT_STATUS_INVALID_PARAMETER_MIX;
3724         }
3725
3726         if (session1->smb2.signing_key.length == 0) {
3727                 return NT_STATUS_INVALID_PARAMETER_MIX;
3728         }
3729
3730         if (conn == NULL) {
3731                 return NT_STATUS_INVALID_PARAMETER_MIX;
3732         }
3733
3734         session2 = talloc_zero(mem_ctx, struct smbXcli_session);
3735         if (session2 == NULL) {
3736                 return NT_STATUS_NO_MEMORY;
3737         }
3738         session2->smb2.session_id = session1->smb2.session_id;
3739         session2->smb2.session_flags = session1->smb2.session_flags;
3740
3741         session2->smb2.session_key = data_blob_dup_talloc(session2,
3742                                                 session1->smb2.session_key);
3743         if (session2->smb2.session_key.data == NULL) {
3744                 return NT_STATUS_NO_MEMORY;
3745         }
3746
3747         session2->smb2.signing_key = data_blob_dup_talloc(session2,
3748                                                 session1->smb2.signing_key);
3749         if (session2->smb2.signing_key.data == NULL) {
3750                 return NT_STATUS_NO_MEMORY;
3751         }
3752
3753         session2->smb2.should_sign = session1->smb2.should_sign;
3754         session2->smb2.channel_setup = true;
3755
3756         talloc_set_destructor(session2, smbXcli_session_destructor);
3757         DLIST_ADD_END(conn->sessions, session2, struct smbXcli_session *);
3758         session2->conn = conn;
3759
3760         *_session2 = session2;
3761         return NT_STATUS_OK;
3762 }