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