source3/libsmb/async_smb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Infrastructure for async SMB client requests
   4    Copyright (C) Volker Lendecke 2008
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libsmb/libsmb.h"
  22 #include "../lib/async_req/async_sock.h"
  23 #include "../lib/util/tevent_ntstatus.h"
  24 #include "../lib/util/tevent_unix.h"
  25 #include "async_smb.h"
  26 #include "smb_crypt.h"
  27 #include "libsmb/nmblib.h"
  28 #include "read_smb.h"
  29
  30 static NTSTATUS cli_pull_raw_error(const uint8_t *buf)
  31 {
  32         uint32_t flags2 = SVAL(buf, smb_flg2);
  33         NTSTATUS status = NT_STATUS(IVAL(buf, smb_rcls));
  34
  35         if (NT_STATUS_IS_OK(status)) {
  36                 return NT_STATUS_OK;
  37         }
  38
  39         if (flags2 & FLAGS2_32_BIT_ERROR_CODES) {
  40                 return status;
  41         }
  42
  43         return NT_STATUS_DOS(CVAL(buf, smb_rcls), SVAL(buf,smb_err));
  44 }
  45
  46 /**
  47  * Figure out if there is an andx command behind the current one
  48  * @param[in] buf       The smb buffer to look at
  49  * @param[in] ofs       The offset to the wct field that is followed by the cmd
  50  * @retval Is there a command following?
  51  */
  52
  53 static bool have_andx_command(const char *buf, uint16_t ofs)
  54 {
  55         uint8_t wct;
  56         size_t buflen = talloc_get_size(buf);
  57
  58         if ((ofs == buflen-1) || (ofs == buflen)) {
  59                 return false;
  60         }
  61
  62         wct = CVAL(buf, ofs);
  63         if (wct < 2) {
  64                 /*
  65                  * Not enough space for the command and a following pointer
  66                  */
  67                 return false;
  68         }
  69         return (CVAL(buf, ofs+1) != 0xff);
  70 }
  71
  72 #define MAX_SMB_IOV 5
  73
  74 struct cli_smb_state {
  75         struct tevent_context *ev;
  76         struct cli_state *cli;
  77         uint8_t header[smb_wct+1]; /* Space for the header including the wct */
  78
  79         /*
  80          * For normal requests, cli_smb_req_send chooses a mid. Secondary
  81          * trans requests need to use the mid of the primary request, so we
  82          * need a place to store it. Assume it's set if != 0.
  83          */
  84         uint16_t mid;
  85
  86         uint16_t *vwv;
  87         uint8_t bytecount_buf[2];
  88
  89         struct iovec iov[MAX_SMB_IOV+3];
  90         int iov_count;
  91
  92         uint8_t *inbuf;
  93         uint32_t seqnum;
  94         int chain_num;
  95         int chain_length;
  96         struct tevent_req **chained_requests;
  97
  98         bool one_way;
  99 };
 100
 101 static uint16_t cli_alloc_mid(struct cli_state *cli)
 102 {
 103         int num_pending = talloc_array_length(cli->conn.pending);
 104         uint16_t result;
 105
 106         while (true) {
 107                 int i;
 108
 109                 result = cli->conn.smb1.mid++;
 110                 if ((result == 0) || (result == 0xffff)) {
 111                         continue;
 112                 }
 113
 114                 for (i=0; i<num_pending; i++) {
 115                         if (result == cli_smb_req_mid(cli->conn.pending[i])) {
 116                                 break;
 117                         }
 118                 }
 119
 120                 if (i == num_pending) {
 121                         return result;
 122                 }
 123         }
 124 }
 125
 126 void cli_smb_req_unset_pending(struct tevent_req *req)
 127 {
 128         struct cli_smb_state *state = tevent_req_data(
 129                 req, struct cli_smb_state);
 130         struct cli_state *cli = state->cli;
 131         int num_pending = talloc_array_length(cli->conn.pending);
 132         int i;
 133
 134         if (state->mid != 0) {
 135                 /*
 136                  * This is a [nt]trans[2] request which waits
 137                  * for more than one reply.
 138                  */
 139                 return;
 140         }
 141
 142         talloc_set_destructor(req, NULL);
 143
 144         if (num_pending == 1) {
 145                 /*
 146                  * The pending read_smb tevent_req is a child of
 147                  * cli->pending. So if nothing is pending anymore, we need to
 148                  * delete the socket read fde.
 149                  */
 150                 TALLOC_FREE(cli->conn.pending);
 151                 cli->conn.read_smb_req = NULL;
 152                 return;
 153         }
 154
 155         for (i=0; i<num_pending; i++) {
 156                 if (req == cli->conn.pending[i]) {
 157                         break;
 158                 }
 159         }
 160         if (i == num_pending) {
 161                 /*
 162                  * Something's seriously broken. Just returning here is the
 163                  * right thing nevertheless, the point of this routine is to
 164                  * remove ourselves from cli->conn.pending.
 165                  */
 166                 return;
 167         }
 168
 169         /*
 170          * Remove ourselves from the cli->conn.pending array
 171          */
 172         for (; i < (num_pending - 1); i++) {
 173                 cli->conn.pending[i] = cli->conn.pending[i+1];
 174         }
 175
 176         /*
 177          * No NULL check here, we're shrinking by sizeof(void *), and
 178          * talloc_realloc just adjusts the size for this.
 179          */
 180         cli->conn.pending = talloc_realloc(NULL, cli->conn.pending,
 181                                            struct tevent_req *,
 182                                            num_pending - 1);
 183         return;
 184 }
 185
 186 static int cli_smb_req_destructor(struct tevent_req *req)
 187 {
 188         struct cli_smb_state *state = tevent_req_data(
 189                 req, struct cli_smb_state);
 190         /*
 191          * Make sure we really remove it from
 192          * the pending array on destruction.
 193          */
 194         state->mid = 0;
 195         cli_smb_req_unset_pending(req);
 196         return 0;
 197 }
 198
 199 static bool cli_state_receive_next(struct cli_state *cli);
 200 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status);
 201
 202 bool cli_smb_req_set_pending(struct tevent_req *req)
 203 {
 204         struct cli_smb_state *state = tevent_req_data(
 205                 req, struct cli_smb_state);
 206         struct cli_state *cli;
 207         struct tevent_req **pending;
 208         int num_pending;
 209
 210         cli = state->cli;
 211         num_pending = talloc_array_length(cli->conn.pending);
 212
 213         pending = talloc_realloc(cli, cli->conn.pending, struct tevent_req *,
 214                                  num_pending+1);
 215         if (pending == NULL) {
 216                 return false;
 217         }
 218         pending[num_pending] = req;
 219         cli->conn.pending = pending;
 220         talloc_set_destructor(req, cli_smb_req_destructor);
 221
 222         if (!cli_state_receive_next(cli)) {
 223                 /*
 224                  * the caller should notify the current request
 225                  *
 226                  * And all other pending requests get notified
 227                  * by cli_state_notify_pending().
 228                  */
 229                 cli_smb_req_unset_pending(req);
 230                 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
 231                 return false;
 232         }
 233
 234         return true;
 235 }
 236
 237 static void cli_smb_received(struct tevent_req *subreq);
 238 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
 239                                         TALLOC_CTX *frame,
 240                                         uint8_t *inbuf);
 241
 242 static bool cli_state_receive_next(struct cli_state *cli)
 243 {
 244         size_t num_pending = talloc_array_length(cli->conn.pending);
 245         struct tevent_req *req;
 246         struct cli_smb_state *state;
 247
 248         if (cli->conn.read_smb_req != NULL) {
 249                 return true;
 250         }
 251
 252         if (num_pending == 0) {
 253                 return true;
 254         }
 255
 256         req = cli->conn.pending[0];
 257         state = tevent_req_data(req, struct cli_smb_state);
 258
 259         cli->conn.dispatch_incoming = cli_state_dispatch_smb1;
 260
 261         /*
 262          * We're the first ones, add the read_smb request that waits for the
 263          * answer from the server
 264          */
 265         cli->conn.read_smb_req = read_smb_send(cli->conn.pending, state->ev,
 266                                                cli->conn.fd);
 267         if (cli->conn.read_smb_req == NULL) {
 268                 return false;
 269         }
 270         tevent_req_set_callback(cli->conn.read_smb_req, cli_smb_received, cli);
 271         return true;
 272 }
 273
 274 static void cli_state_notify_pending(struct cli_state *cli, NTSTATUS status)
 275 {
 276         cli_state_disconnect(cli);
 277
 278         /*
 279          * Cancel all pending requests. We do not do a for-loop walking
 280          * cli->conn.pending because that array changes in
 281          * cli_smb_req_destructor().
 282          */
 283         while (talloc_array_length(cli->conn.pending) > 0) {
 284                 struct tevent_req *req;
 285                 struct cli_smb_state *state;
 286
 287                 req = cli->conn.pending[0];
 288                 state = tevent_req_data(req, struct cli_smb_state);
 289
 290                 cli_smb_req_unset_pending(req);
 291
 292                 /*
 293                  * we need to defer the callback, because we may notify more
 294                  * then one caller.
 295                  */
 296                 tevent_req_defer_callback(req, state->ev);
 297                 tevent_req_nterror(req, status);
 298         }
 299 }
 300
 301 /*
 302  * Fetch a smb request's mid. Only valid after the request has been sent by
 303  * cli_smb_req_send().
 304  */
 305 uint16_t cli_smb_req_mid(struct tevent_req *req)
 306 {
 307         struct cli_smb_state *state = tevent_req_data(
 308                 req, struct cli_smb_state);
 309
 310         if (state->mid != 0) {
 311                 return state->mid;
 312         }
 313
 314         return SVAL(state->header, smb_mid);
 315 }
 316
 317 void cli_smb_req_set_mid(struct tevent_req *req, uint16_t mid)
 318 {
 319         struct cli_smb_state *state = tevent_req_data(
 320                 req, struct cli_smb_state);
 321         state->mid = mid;
 322 }
 323
 324 uint32_t cli_smb_req_seqnum(struct tevent_req *req)
 325 {
 326         struct cli_smb_state *state = tevent_req_data(
 327                 req, struct cli_smb_state);
 328         return state->seqnum;
 329 }
 330
 331 void cli_smb_req_set_seqnum(struct tevent_req *req, uint32_t seqnum)
 332 {
 333         struct cli_smb_state *state = tevent_req_data(
 334                 req, struct cli_smb_state);
 335         state->seqnum = seqnum;
 336 }
 337
 338 static size_t iov_len(const struct iovec *iov, int count)
 339 {
 340         size_t result = 0;
 341         int i;
 342         for (i=0; i<count; i++) {
 343                 result += iov[i].iov_len;
 344         }
 345         return result;
 346 }
 347
 348 static uint8_t *iov_concat(TALLOC_CTX *mem_ctx, const struct iovec *iov,
 349                            int count)
 350 {
 351         size_t len = iov_len(iov, count);
 352         size_t copied;
 353         uint8_t *buf;
 354         int i;
 355
 356         buf = talloc_array(mem_ctx, uint8_t, len);
 357         if (buf == NULL) {
 358                 return NULL;
 359         }
 360         copied = 0;
 361         for (i=0; i<count; i++) {
 362                 memcpy(buf+copied, iov[i].iov_base, iov[i].iov_len);
 363                 copied += iov[i].iov_len;
 364         }
 365         return buf;
 366 }
 367
 368 struct tevent_req *cli_smb_req_create(TALLOC_CTX *mem_ctx,
 369                                       struct event_context *ev,
 370                                       struct cli_state *cli,
 371                                       uint8_t smb_command,
 372                                       uint8_t additional_flags,
 373                                       uint8_t wct, uint16_t *vwv,
 374                                       int iov_count,
 375                                       struct iovec *bytes_iov)
 376 {
 377         struct tevent_req *result;
 378         struct cli_smb_state *state;
 379         struct timeval endtime;
 380
 381         if (iov_count > MAX_SMB_IOV) {
 382                 /*
 383                  * Should not happen :-)
 384                  */
 385                 return NULL;
 386         }
 387
 388         result = tevent_req_create(mem_ctx, &state, struct cli_smb_state);
 389         if (result == NULL) {
 390                 return NULL;
 391         }
 392         state->ev = ev;
 393         state->cli = cli;
 394         state->mid = 0;         /* Set to auto-choose in cli_smb_req_send */
 395         state->chain_num = 0;
 396         state->chained_requests = NULL;
 397
 398         cli_setup_packet_buf(cli, (char *)state->header);
 399         SCVAL(state->header, smb_com, smb_command);
 400         SSVAL(state->header, smb_tid, cli->smb1.tid);
 401         SCVAL(state->header, smb_wct, wct);
 402
 403         state->vwv = vwv;
 404
 405         SSVAL(state->bytecount_buf, 0, iov_len(bytes_iov, iov_count));
 406
 407         state->iov[0].iov_base = (void *)state->header;
 408         state->iov[0].iov_len  = sizeof(state->header);
 409         state->iov[1].iov_base = (void *)state->vwv;
 410         state->iov[1].iov_len  = wct * sizeof(uint16_t);
 411         state->iov[2].iov_base = (void *)state->bytecount_buf;
 412         state->iov[2].iov_len  = sizeof(uint16_t);
 413
 414         if (iov_count != 0) {
 415                 memcpy(&state->iov[3], bytes_iov,
 416                        iov_count * sizeof(*bytes_iov));
 417         }
 418         state->iov_count = iov_count + 3;
 419
 420         if (cli->timeout) {
 421                 endtime = timeval_current_ofs_msec(cli->timeout);
 422                 if (!tevent_req_set_endtime(result, ev, endtime)) {
 423                         return result;
 424                 }
 425         }
 426
 427         switch (smb_command) {
 428         case SMBtranss:
 429         case SMBtranss2:
 430         case SMBnttranss:
 431         case SMBntcancel:
 432                 state->one_way = true;
 433                 break;
 434         case SMBlockingX:
 435                 if ((wct == 8) &&
 436                     (CVAL(vwv+3, 0) == LOCKING_ANDX_OPLOCK_RELEASE)) {
 437                         state->one_way = true;
 438                 }
 439                 break;
 440         }
 441
 442         return result;
 443 }
 444
 445 static NTSTATUS cli_signv(struct cli_state *cli, struct iovec *iov, int count,
 446                           uint32_t *seqnum)
 447 {
 448         uint8_t *buf;
 449
 450         /*
 451          * Obvious optimization: Make cli_calculate_sign_mac work with struct
 452          * iovec directly. MD5Update would do that just fine.
 453          */
 454
 455         if ((count <= 0) || (iov[0].iov_len < smb_wct)) {
 456                 return NT_STATUS_INVALID_PARAMETER;
 457         }
 458
 459         buf = iov_concat(talloc_tos(), iov, count);
 460         if (buf == NULL) {
 461                 return NT_STATUS_NO_MEMORY;
 462         }
 463
 464         cli_calculate_sign_mac(cli, (char *)buf, seqnum);
 465         memcpy(iov[0].iov_base, buf, iov[0].iov_len);
 466
 467         TALLOC_FREE(buf);
 468         return NT_STATUS_OK;
 469 }
 470
 471 static void cli_smb_sent(struct tevent_req *subreq);
 472
 473 static NTSTATUS cli_smb_req_iov_send(struct tevent_req *req,
 474                                      struct cli_smb_state *state,
 475                                      struct iovec *iov, int iov_count)
 476 {
 477         struct tevent_req *subreq;
 478         NTSTATUS status;
 479
 480         if (!cli_state_is_connected(state->cli)) {
 481                 return NT_STATUS_CONNECTION_DISCONNECTED;
 482         }
 483
 484         if (iov[0].iov_len < smb_wct) {
 485                 return NT_STATUS_INVALID_PARAMETER;
 486         }
 487
 488         if (state->mid != 0) {
 489                 SSVAL(iov[0].iov_base, smb_mid, state->mid);
 490         } else {
 491                 uint16_t mid = cli_alloc_mid(state->cli);
 492                 SSVAL(iov[0].iov_base, smb_mid, mid);
 493         }
 494
 495         smb_setlen((char *)iov[0].iov_base, iov_len(iov, iov_count) - 4);
 496
 497         status = cli_signv(state->cli, iov, iov_count, &state->seqnum);
 498
 499         if (!NT_STATUS_IS_OK(status)) {
 500                 return status;
 501         }
 502
 503         if (cli_state_encryption_on(state->cli)) {
 504                 char *buf, *enc_buf;
 505
 506                 buf = (char *)iov_concat(talloc_tos(), iov, iov_count);
 507                 if (buf == NULL) {
 508                         return NT_STATUS_NO_MEMORY;
 509                 }
 510                 status = common_encrypt_buffer(state->cli->trans_enc_state,
 511                                                (char *)buf, &enc_buf);
 512                 TALLOC_FREE(buf);
 513                 if (!NT_STATUS_IS_OK(status)) {
 514                         DEBUG(0, ("Error in encrypting client message: %s\n",
 515                                   nt_errstr(status)));
 516                         return status;
 517                 }
 518                 buf = (char *)talloc_memdup(state, enc_buf,
 519                                             smb_len(enc_buf)+4);
 520                 SAFE_FREE(enc_buf);
 521                 if (buf == NULL) {
 522                         return NT_STATUS_NO_MEMORY;
 523                 }
 524                 iov[0].iov_base = (void *)buf;
 525                 iov[0].iov_len = talloc_get_size(buf);
 526                 iov_count = 1;
 527         }
 528         subreq = writev_send(state, state->ev, state->cli->conn.outgoing,
 529                              state->cli->conn.fd, false, iov, iov_count);
 530         if (subreq == NULL) {
 531                 return NT_STATUS_NO_MEMORY;
 532         }
 533         tevent_req_set_callback(subreq, cli_smb_sent, req);
 534         return NT_STATUS_OK;
 535 }
 536
 537 NTSTATUS cli_smb_req_send(struct tevent_req *req)
 538 {
 539         struct cli_smb_state *state = tevent_req_data(
 540                 req, struct cli_smb_state);
 541
 542         if (!tevent_req_is_in_progress(req)) {
 543                 return NT_STATUS_INTERNAL_ERROR;
 544         }
 545
 546         return cli_smb_req_iov_send(req, state, state->iov, state->iov_count);
 547 }
 548
 549 struct tevent_req *cli_smb_send(TALLOC_CTX *mem_ctx,
 550                                 struct event_context *ev,
 551                                 struct cli_state *cli,
 552                                 uint8_t smb_command,
 553                                 uint8_t additional_flags,
 554                                 uint8_t wct, uint16_t *vwv,
 555                                 uint32_t num_bytes,
 556                                 const uint8_t *bytes)
 557 {
 558         struct tevent_req *req;
 559         struct iovec iov;
 560         NTSTATUS status;
 561
 562         iov.iov_base = discard_const_p(void, bytes);
 563         iov.iov_len = num_bytes;
 564
 565         req = cli_smb_req_create(mem_ctx, ev, cli, smb_command,
 566                                  additional_flags, wct, vwv, 1, &iov);
 567         if (req == NULL) {
 568                 return NULL;
 569         }
 570         if (!tevent_req_is_in_progress(req)) {
 571                 return tevent_req_post(req, ev);
 572         }
 573         status = cli_smb_req_send(req);
 574         if (!NT_STATUS_IS_OK(status)) {
 575                 tevent_req_nterror(req, status);
 576                 return tevent_req_post(req, ev);
 577         }
 578         return req;
 579 }
 580
 581 static void cli_smb_sent(struct tevent_req *subreq)
 582 {
 583         struct tevent_req *req = tevent_req_callback_data(
 584                 subreq, struct tevent_req);
 585         struct cli_smb_state *state = tevent_req_data(
 586                 req, struct cli_smb_state);
 587         ssize_t nwritten;
 588         int err;
 589
 590         nwritten = writev_recv(subreq, &err);
 591         TALLOC_FREE(subreq);
 592         if (nwritten == -1) {
 593                 NTSTATUS status = map_nt_error_from_unix(err);
 594                 cli_state_notify_pending(state->cli, status);
 595                 return;
 596         }
 597
 598         if (state->one_way) {
 599                 state->inbuf = NULL;
 600                 tevent_req_done(req);
 601                 return;
 602         }
 603
 604         if (!cli_smb_req_set_pending(req)) {
 605                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 606                 return;
 607         }
 608 }
 609
 610 static void cli_smb_received(struct tevent_req *subreq)
 611 {
 612         struct cli_state *cli = tevent_req_callback_data(
 613                 subreq, struct cli_state);
 614         TALLOC_CTX *frame = talloc_stackframe();
 615         NTSTATUS status;
 616         uint8_t *inbuf;
 617         ssize_t received;
 618         int err;
 619
 620         if (subreq != cli->conn.read_smb_req) {
 621                 DEBUG(1, ("Internal error: cli_smb_received called with "
 622                           "unexpected subreq\n"));
 623                 status = NT_STATUS_INTERNAL_ERROR;
 624                 cli_state_notify_pending(cli, status);
 625                 TALLOC_FREE(frame);
 626                 return;
 627         }
 628
 629         received = read_smb_recv(subreq, frame, &inbuf, &err);
 630         TALLOC_FREE(subreq);
 631         cli->conn.read_smb_req = NULL;
 632         if (received == -1) {
 633                 status = map_nt_error_from_unix(err);
 634                 cli_state_notify_pending(cli, status);
 635                 TALLOC_FREE(frame);
 636                 return;
 637         }
 638
 639         status = cli->conn.dispatch_incoming(cli, frame, inbuf);
 640         TALLOC_FREE(frame);
 641         if (NT_STATUS_IS_OK(status)) {
 642                 /*
 643                  * We should not do any more processing
 644                  * as the dispatch function called
 645                  * tevent_req_done().
 646                  */
 647                 return;
 648         } else if (!NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 649                 /*
 650                  * We got an error, so notify all pending requests
 651                  */
 652                 cli_state_notify_pending(cli, status);
 653                 return;
 654         }
 655
 656         /*
 657          * We got NT_STATUS_RETRY, so we may ask for a
 658          * next incoming pdu.
 659          */
 660         if (!cli_state_receive_next(cli)) {
 661                 cli_state_notify_pending(cli, NT_STATUS_NO_MEMORY);
 662         }
 663 }
 664
 665 static NTSTATUS cli_state_dispatch_smb1(struct cli_state *cli,
 666                                         TALLOC_CTX *frame,
 667                                         uint8_t *inbuf)
 668 {
 669         struct tevent_req *req;
 670         struct cli_smb_state *state;
 671         NTSTATUS status;
 672         int num_pending;
 673         int i;
 674         uint16_t mid;
 675         bool oplock_break;
 676
 677         if ((IVAL(inbuf, 4) != 0x424d53ff) /* 0xFF"SMB" */
 678             && (SVAL(inbuf, 4) != 0x45ff)) /* 0xFF"E" */ {
 679                 DEBUG(10, ("Got non-SMB PDU\n"));
 680                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 681         }
 682
 683         if (cli_state_encryption_on(cli) && (CVAL(inbuf, 0) == 0)) {
 684                 uint16_t enc_ctx_num;
 685
 686                 status = get_enc_ctx_num(inbuf, &enc_ctx_num);
 687                 if (!NT_STATUS_IS_OK(status)) {
 688                         DEBUG(10, ("get_enc_ctx_num returned %s\n",
 689                                    nt_errstr(status)));
 690                         return status;
 691                 }
 692
 693                 if (enc_ctx_num != cli->trans_enc_state->enc_ctx_num) {
 694                         DEBUG(10, ("wrong enc_ctx %d, expected %d\n",
 695                                    enc_ctx_num,
 696                                    cli->trans_enc_state->enc_ctx_num));
 697                         return NT_STATUS_INVALID_HANDLE;
 698                 }
 699
 700                 status = common_decrypt_buffer(cli->trans_enc_state,
 701                                                (char *)inbuf);
 702                 if (!NT_STATUS_IS_OK(status)) {
 703                         DEBUG(10, ("common_decrypt_buffer returned %s\n",
 704                                    nt_errstr(status)));
 705                         return status;
 706                 }
 707         }
 708
 709         mid = SVAL(inbuf, smb_mid);
 710         num_pending = talloc_array_length(cli->conn.pending);
 711
 712         for (i=0; i<num_pending; i++) {
 713                 if (mid == cli_smb_req_mid(cli->conn.pending[i])) {
 714                         break;
 715                 }
 716         }
 717         if (i == num_pending) {
 718                 /* Dump unexpected reply */
 719                 return NT_STATUS_RETRY;
 720         }
 721
 722         oplock_break = false;
 723
 724         if (mid == 0xffff) {
 725                 /*
 726                  * Paranoia checks that this is really an oplock break request.
 727                  */
 728                 oplock_break = (smb_len(inbuf) == 51); /* hdr + 8 words */
 729                 oplock_break &= ((CVAL(inbuf, smb_flg) & FLAG_REPLY) == 0);
 730                 oplock_break &= (CVAL(inbuf, smb_com) == SMBlockingX);
 731                 oplock_break &= (SVAL(inbuf, smb_vwv6) == 0);
 732                 oplock_break &= (SVAL(inbuf, smb_vwv7) == 0);
 733
 734                 if (!oplock_break) {
 735                         /* Dump unexpected reply */
 736                         return NT_STATUS_RETRY;
 737                 }
 738         }
 739
 740         req = cli->conn.pending[i];
 741         state = tevent_req_data(req, struct cli_smb_state);
 742
 743         if (!oplock_break /* oplock breaks are not signed */
 744             && !cli_check_sign_mac(cli, (char *)inbuf, state->seqnum+1)) {
 745                 DEBUG(10, ("cli_check_sign_mac failed\n"));
 746                 return NT_STATUS_ACCESS_DENIED;
 747         }
 748
 749         if (state->chained_requests != NULL) {
 750                 struct tevent_req **chain = talloc_move(frame,
 751                                             &state->chained_requests);
 752                 int num_chained = talloc_array_length(chain);
 753
 754                 /*
 755                  * We steal the inbuf to the chain,
 756                  * so that it will stay until all
 757                  * requests of the chain are finished.
 758                  *
 759                  * Each requests in the chain will
 760                  * hold a talloc reference to the chain.
 761                  * This way we do not expose the talloc_reference()
 762                  * behavior to the callers.
 763                  */
 764                 talloc_steal(chain, inbuf);
 765
 766                 for (i=0; i<num_chained; i++) {
 767                         struct tevent_req **ref;
 768
 769                         req = chain[i];
 770                         state = tevent_req_data(req, struct cli_smb_state);
 771
 772                         cli_smb_req_unset_pending(req);
 773
 774                         /*
 775                          * as we finish multiple requests here
 776                          * we need to defer the callbacks as
 777                          * they could destroy our current stack state.
 778                          */
 779                         tevent_req_defer_callback(req, state->ev);
 780
 781                         ref = talloc_reference(state, chain);
 782                         if (tevent_req_nomem(ref, req)) {
 783                                 continue;
 784                         }
 785
 786                         state->inbuf = inbuf;
 787                         state->chain_num = i;
 788                         state->chain_length = num_chained;
 789
 790                         tevent_req_done(req);
 791                 }
 792
 793                 return NT_STATUS_RETRY;
 794         }
 795
 796         cli_smb_req_unset_pending(req);
 797
 798         state->inbuf = talloc_move(state, &inbuf);
 799         state->chain_num = 0;
 800         state->chain_length = 1;
 801
 802         if (talloc_array_length(cli->conn.pending) == 0) {
 803                 tevent_req_done(req);
 804                 return NT_STATUS_OK;
 805         }
 806
 807         tevent_req_defer_callback(req, state->ev);
 808         tevent_req_done(req);
 809         return NT_STATUS_RETRY;
 810 }
 811
 812 NTSTATUS cli_smb_recv(struct tevent_req *req,
 813                       TALLOC_CTX *mem_ctx, uint8_t **pinbuf,
 814                       uint8_t min_wct, uint8_t *pwct, uint16_t **pvwv,
 815                       uint32_t *pnum_bytes, uint8_t **pbytes)
 816 {
 817         struct cli_smb_state *state = tevent_req_data(
 818                 req, struct cli_smb_state);
 819         NTSTATUS status = NT_STATUS_OK;
 820         uint8_t cmd, wct;
 821         uint16_t num_bytes;
 822         size_t wct_ofs, bytes_offset;
 823         int i;
 824
 825         if (tevent_req_is_nterror(req, &status)) {
 826                 return status;
 827         }
 828
 829         if (state->inbuf == NULL) {
 830                 if (min_wct != 0) {
 831                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 832                 }
 833                 if (pinbuf) {
 834                         *pinbuf = NULL;
 835                 }
 836                 if (pwct) {
 837                         *pwct = 0;
 838                 }
 839                 if (pvwv) {
 840                         *pvwv = NULL;
 841                 }
 842                 if (pnum_bytes) {
 843                         *pnum_bytes = 0;
 844                 }
 845                 if (pbytes) {
 846                         *pbytes = NULL;
 847                 }
 848                 /* This was a request without a reply */
 849                 return NT_STATUS_OK;
 850         }
 851
 852         wct_ofs = smb_wct;
 853         cmd = CVAL(state->inbuf, smb_com);
 854
 855         for (i=0; i<state->chain_num; i++) {
 856                 if (i < state->chain_num-1) {
 857                         if (cmd == 0xff) {
 858                                 return NT_STATUS_REQUEST_ABORTED;
 859                         }
 860                         if (!is_andx_req(cmd)) {
 861                                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 862                         }
 863                 }
 864
 865                 if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 866                         /*
 867                          * This request was not completed because a previous
 868                          * request in the chain had received an error.
 869                          */
 870                         return NT_STATUS_REQUEST_ABORTED;
 871                 }
 872
 873                 wct_ofs = SVAL(state->inbuf, wct_ofs + 3);
 874
 875                 /*
 876                  * Skip the all-present length field. No overflow, we've just
 877                  * put a 16-bit value into a size_t.
 878                  */
 879                 wct_ofs += 4;
 880
 881                 if (wct_ofs+2 > talloc_get_size(state->inbuf)) {
 882                         return NT_STATUS_INVALID_NETWORK_RESPONSE;
 883                 }
 884
 885                 cmd = CVAL(state->inbuf, wct_ofs + 1);
 886         }
 887
 888         state->cli->raw_status = cli_pull_raw_error(state->inbuf);
 889         if (NT_STATUS_IS_DOS(state->cli->raw_status)) {
 890                 uint8_t eclass = NT_STATUS_DOS_CLASS(state->cli->raw_status);
 891                 uint16_t ecode = NT_STATUS_DOS_CODE(state->cli->raw_status);
 892                 /*
 893                  * TODO: is it really a good idea to do a mapping here?
 894                  *
 895                  * The old cli_pull_error() also does it, so I do not change
 896                  * the behavior yet.
 897                  */
 898                 status = dos_to_ntstatus(eclass, ecode);
 899         } else {
 900                 status = state->cli->raw_status;
 901         }
 902
 903         if (!have_andx_command((char *)state->inbuf, wct_ofs)) {
 904
 905                 if ((cmd == SMBsesssetupX)
 906                     && NT_STATUS_EQUAL(
 907                             status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 908                         /*
 909                          * NT_STATUS_MORE_PROCESSING_REQUIRED is a
 910                          * valid return code for session setup
 911                          */
 912                         goto no_err;
 913                 }
 914
 915                 if (NT_STATUS_IS_ERR(status)) {
 916                         /*
 917                          * The last command takes the error code. All
 918                          * further commands down the requested chain
 919                          * will get a NT_STATUS_REQUEST_ABORTED.
 920                          */
 921                         return status;
 922                 }
 923         }
 924
 925 no_err:
 926
 927         wct = CVAL(state->inbuf, wct_ofs);
 928         bytes_offset = wct_ofs + 1 + wct * sizeof(uint16_t);
 929         num_bytes = SVAL(state->inbuf, bytes_offset);
 930
 931         if (wct < min_wct) {
 932                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 933         }
 934
 935         /*
 936          * wct_ofs is a 16-bit value plus 4, wct is a 8-bit value, num_bytes
 937          * is a 16-bit value. So bytes_offset being size_t should be far from
 938          * wrapping.
 939          */
 940         if ((bytes_offset + 2 > talloc_get_size(state->inbuf))
 941             || (bytes_offset > 0xffff)) {
 942                 return NT_STATUS_INVALID_NETWORK_RESPONSE;
 943         }
 944
 945         if (pwct != NULL) {
 946                 *pwct = wct;
 947         }
 948         if (pvwv != NULL) {
 949                 *pvwv = (uint16_t *)(state->inbuf + wct_ofs + 1);
 950         }
 951         if (pnum_bytes != NULL) {
 952                 *pnum_bytes = num_bytes;
 953         }
 954         if (pbytes != NULL) {
 955                 *pbytes = (uint8_t *)state->inbuf + bytes_offset + 2;
 956         }
 957         if ((mem_ctx != NULL) && (pinbuf != NULL)) {
 958                 if (state->chain_num == state->chain_length-1) {
 959                         *pinbuf = talloc_move(mem_ctx, &state->inbuf);
 960                 } else {
 961                         *pinbuf = state->inbuf;
 962                 }
 963         }
 964
 965         return status;
 966 }
 967
 968 size_t cli_smb_wct_ofs(struct tevent_req **reqs, int num_reqs)
 969 {
 970         size_t wct_ofs;
 971         int i;
 972
 973         wct_ofs = smb_wct - 4;
 974
 975         for (i=0; i<num_reqs; i++) {
 976                 struct cli_smb_state *state;
 977                 state = tevent_req_data(reqs[i], struct cli_smb_state);
 978                 wct_ofs += iov_len(state->iov+1, state->iov_count-1);
 979                 wct_ofs = (wct_ofs + 3) & ~3;
 980         }
 981         return wct_ofs;
 982 }
 983
 984 NTSTATUS cli_smb_chain_send(struct tevent_req **reqs, int num_reqs)
 985 {
 986         struct cli_smb_state *first_state = tevent_req_data(
 987                 reqs[0], struct cli_smb_state);
 988         struct cli_smb_state *last_state = tevent_req_data(
 989                 reqs[num_reqs-1], struct cli_smb_state);
 990         struct cli_smb_state *state;
 991         size_t wct_offset;
 992         size_t chain_padding = 0;
 993         int i, iovlen;
 994         struct iovec *iov = NULL;
 995         struct iovec *this_iov;
 996         NTSTATUS status;
 997
 998         iovlen = 0;
 999         for (i=0; i<num_reqs; i++) {
1000                 if (!tevent_req_is_in_progress(reqs[i])) {
1001                         return NT_STATUS_INTERNAL_ERROR;
1002                 }
1003
1004                 state = tevent_req_data(reqs[i], struct cli_smb_state);
1005                 iovlen += state->iov_count;
1006         }
1007
1008         iov = talloc_array(last_state, struct iovec, iovlen);
1009         if (iov == NULL) {
1010                 return NT_STATUS_NO_MEMORY;
1011         }
1012
1013         first_state->chained_requests = (struct tevent_req **)talloc_memdup(
1014                 last_state, reqs, sizeof(*reqs) * num_reqs);
1015         if (first_state->chained_requests == NULL) {
1016                 TALLOC_FREE(iov);
1017                 return NT_STATUS_NO_MEMORY;
1018         }
1019
1020         wct_offset = smb_wct - 4;
1021         this_iov = iov;
1022
1023         for (i=0; i<num_reqs; i++) {
1024                 size_t next_padding = 0;
1025                 uint16_t *vwv;
1026
1027                 state = tevent_req_data(reqs[i], struct cli_smb_state);
1028
1029                 if (i < num_reqs-1) {
1030                         if (!is_andx_req(CVAL(state->header, smb_com))
1031                             || CVAL(state->header, smb_wct) < 2) {
1032                                 TALLOC_FREE(iov);
1033                                 TALLOC_FREE(first_state->chained_requests);
1034                                 return NT_STATUS_INVALID_PARAMETER;
1035                         }
1036                 }
1037
1038                 wct_offset += iov_len(state->iov+1, state->iov_count-1) + 1;
1039                 if ((wct_offset % 4) != 0) {
1040                         next_padding = 4 - (wct_offset % 4);
1041                 }
1042                 wct_offset += next_padding;
1043                 vwv = state->vwv;
1044
1045                 if (i < num_reqs-1) {
1046                         struct cli_smb_state *next_state = tevent_req_data(
1047                                 reqs[i+1], struct cli_smb_state);
1048                         SCVAL(vwv+0, 0, CVAL(next_state->header, smb_com));
1049                         SCVAL(vwv+0, 1, 0);
1050                         SSVAL(vwv+1, 0, wct_offset);
1051                 } else if (is_andx_req(CVAL(state->header, smb_com))) {
1052                         /* properly end the chain */
1053                         SCVAL(vwv+0, 0, 0xff);
1054                         SCVAL(vwv+0, 1, 0xff);
1055                         SSVAL(vwv+1, 0, 0);
1056                 }
1057
1058                 if (i == 0) {
1059                         this_iov[0] = state->iov[0];
1060                 } else {
1061                         /*
1062                          * This one is a bit subtle. We have to add
1063                          * chain_padding bytes between the requests, and we
1064                          * have to also include the wct field of the
1065                          * subsequent requests. We use the subsequent header
1066                          * for the padding, it contains the wct field in its
1067                          * last byte.
1068                          */
1069                         this_iov[0].iov_len = chain_padding+1;
1070                         this_iov[0].iov_base = (void *)&state->header[
1071                                 sizeof(state->header) - this_iov[0].iov_len];
1072                         memset(this_iov[0].iov_base, 0, this_iov[0].iov_len-1);
1073                 }
1074                 memcpy(this_iov+1, state->iov+1,
1075                        sizeof(struct iovec) * (state->iov_count-1));
1076                 this_iov += state->iov_count;
1077                 chain_padding = next_padding;
1078         }
1079
1080         status = cli_smb_req_iov_send(reqs[0], last_state, iov, iovlen);
1081         if (!NT_STATUS_IS_OK(status)) {
1082                 TALLOC_FREE(iov);
1083                 TALLOC_FREE(first_state->chained_requests);
1084                 return status;
1085         }
1086
1087         return NT_STATUS_OK;
1088 }
1089
1090 bool cli_has_async_calls(struct cli_state *cli)
1091 {
1092         return ((tevent_queue_length(cli->conn.outgoing) != 0)
1093                 || (talloc_array_length(cli->conn.pending) != 0));
1094 }