source3/smbd/smb2_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   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 "smbd/globals.h"
  23 #include "../libcli/smb/smb_common.h"
  24 #include "../lib/tsocket/tsocket.h"
  25
  26 bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
  27 {
  28         if (size < (4 + SMB2_HDR_BODY)) {
  29                 return false;
  30         }
  31
  32         if (IVAL(inbuf, 4) != SMB2_MAGIC) {
  33                 return false;
  34         }
  35
  36         return true;
  37 }
  38
  39 static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *sconn)
  40 {
  41         NTSTATUS status;
  42         int ret;
  43
  44         TALLOC_FREE(sconn->smb1.fde);
  45
  46         sconn->smb2.event_ctx = smbd_event_context();
  47
  48         sconn->smb2.recv_queue = tevent_queue_create(sconn, "smb2 recv queue");
  49         if (sconn->smb2.recv_queue == NULL) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         sconn->smb2.send_queue = tevent_queue_create(sconn, "smb2 send queue");
  54         if (sconn->smb2.send_queue == NULL) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         sconn->smb2.sessions.idtree = idr_init(sconn);
  59         if (sconn->smb2.sessions.idtree == NULL) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62         sconn->smb2.sessions.limit = 0x0000FFFE;
  63         sconn->smb2.sessions.list = NULL;
  64
  65         ret = tstream_bsd_existing_socket(sconn, smbd_server_fd(),
  66                                           &sconn->smb2.stream);
  67         if (ret == -1) {
  68                 status = map_nt_error_from_unix(errno);
  69                 return status;
  70         }
  71
  72         /* Ensure child is set to non-blocking mode */
  73         set_blocking(smbd_server_fd(),false);
  74         return NT_STATUS_OK;
  75 }
  76
  77 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  78 #define _smb2_setlen(_buf,len) do { \
  79         uint8_t *buf = (uint8_t *)_buf; \
  80         buf[0] = 0; \
  81         buf[1] = ((len)&0xFF0000)>>16; \
  82         buf[2] = ((len)&0xFF00)>>8; \
  83         buf[3] = (len)&0xFF; \
  84 } while (0)
  85
  86 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  87 {
  88         size_t len = 0;
  89         int i;
  90
  91         for (i=1; i < count; i++) {
  92                 len += vector[i].iov_len;
  93         }
  94
  95         _smb2_setlen(vector[0].iov_base, len);
  96 }
  97
  98 static int smbd_smb2_request_parent_destructor(struct smbd_smb2_request **req)
  99 {
 100         if (*req) {
 101                 (*req)->parent = NULL;
 102                 (*req)->mem_pool = NULL;
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int smbd_smb2_request_destructor(struct smbd_smb2_request *req)
 109 {
 110         if (req->out.vector) {
 111                 DLIST_REMOVE(req->sconn->smb2.requests, req);
 112         }
 113
 114         if (req->parent) {
 115                 *req->parent = NULL;
 116                 talloc_free(req->mem_pool);
 117         }
 118
 119         return 0;
 120 }
 121
 122 static struct smbd_smb2_request *smbd_smb2_request_allocate(TALLOC_CTX *mem_ctx)
 123 {
 124         TALLOC_CTX *mem_pool;
 125         struct smbd_smb2_request **parent;
 126         struct smbd_smb2_request *req;
 127
 128         mem_pool = talloc_pool(mem_ctx, 8192);
 129         if (mem_pool == NULL) {
 130                 return NULL;
 131         }
 132
 133         parent = talloc(mem_pool, struct smbd_smb2_request *);
 134         if (parent == NULL) {
 135                 talloc_free(mem_pool);
 136                 return NULL;
 137         }
 138
 139         req = talloc_zero(parent, struct smbd_smb2_request);
 140         if (req == NULL) {
 141                 talloc_free(mem_pool);
 142                 return NULL;
 143         }
 144         *parent         = req;
 145         req->mem_pool   = mem_pool;
 146         req->parent     = parent;
 147
 148         talloc_set_destructor(parent, smbd_smb2_request_parent_destructor);
 149         talloc_set_destructor(req, smbd_smb2_request_destructor);
 150
 151         return req;
 152 }
 153
 154 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *sconn,
 155                                          const uint8_t *inbuf, size_t size,
 156                                          struct smbd_smb2_request **_req)
 157 {
 158         struct smbd_smb2_request *req;
 159         uint32_t protocol_version;
 160         const uint8_t *inhdr = NULL;
 161         off_t ofs = 0;
 162         uint16_t cmd;
 163         uint32_t next_command_ofs;
 164
 165         if (size < (4 + SMB2_HDR_BODY + 2)) {
 166                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 167                 return NT_STATUS_INVALID_PARAMETER;
 168         }
 169
 170         inhdr = inbuf + 4;
 171
 172         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 173         if (protocol_version != SMB2_MAGIC) {
 174                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 175                          protocol_version));
 176                 return NT_STATUS_INVALID_PARAMETER;
 177         }
 178
 179         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 180         if (cmd != SMB2_OP_NEGPROT) {
 181                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 182                          cmd));
 183                 return NT_STATUS_INVALID_PARAMETER;
 184         }
 185
 186         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 187         if (next_command_ofs != 0) {
 188                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 189                          next_command_ofs));
 190                 return NT_STATUS_INVALID_PARAMETER;
 191         }
 192
 193         req = smbd_smb2_request_allocate(sconn);
 194         if (req == NULL) {
 195                 return NT_STATUS_NO_MEMORY;
 196         }
 197         req->sconn = sconn;
 198
 199         talloc_steal(req, inbuf);
 200
 201         req->in.vector = talloc_array(req, struct iovec, 4);
 202         if (req->in.vector == NULL) {
 203                 TALLOC_FREE(req);
 204                 return NT_STATUS_NO_MEMORY;
 205         }
 206         req->in.vector_count = 4;
 207
 208         memcpy(req->in.nbt_hdr, inbuf, 4);
 209
 210         ofs = 0;
 211         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 212         req->in.vector[0].iov_len       = 4;
 213         ofs += req->in.vector[0].iov_len;
 214
 215         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 216         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 217         ofs += req->in.vector[1].iov_len;
 218
 219         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 220         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 221         ofs += req->in.vector[2].iov_len;
 222
 223         if (ofs > size) {
 224                 return NT_STATUS_INVALID_PARAMETER;
 225         }
 226
 227         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 228         req->in.vector[3].iov_len       = size - ofs;
 229         ofs += req->in.vector[3].iov_len;
 230
 231         req->current_idx = 1;
 232
 233         *_req = req;
 234         return NT_STATUS_OK;
 235 }
 236
 237 static NTSTATUS smbd_smb2_request_validate(struct smbd_smb2_request *req)
 238 {
 239         int count;
 240         int idx;
 241         bool compound_related = false;
 242
 243         count = req->in.vector_count;
 244
 245         if (count < 4) {
 246                 /* It's not a SMB2 request */
 247                 return NT_STATUS_INVALID_PARAMETER;
 248         }
 249
 250         for (idx=1; idx < count; idx += 3) {
 251                 const uint8_t *inhdr = NULL;
 252                 uint32_t flags;
 253
 254                 if (req->in.vector[idx].iov_len != SMB2_HDR_BODY) {
 255                         return NT_STATUS_INVALID_PARAMETER;
 256                 }
 257
 258                 if (req->in.vector[idx+1].iov_len < 2) {
 259                         return NT_STATUS_INVALID_PARAMETER;
 260                 }
 261
 262                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 263
 264                 /* setup the SMB2 header */
 265                 if (IVAL(inhdr, SMB2_HDR_PROTOCOL_ID) != SMB2_MAGIC) {
 266                         return NT_STATUS_INVALID_PARAMETER;
 267                 }
 268
 269                 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 270                 if (idx == 1) {
 271                         /*
 272                          * the 1st request should never have the
 273                          * SMB2_HDR_FLAG_CHAINED flag set
 274                          */
 275                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 276                                 req->next_status = NT_STATUS_INVALID_PARAMETER;
 277                                 return NT_STATUS_OK;
 278                         }
 279                 } else if (idx == 4) {
 280                         /*
 281                          * the 2nd request triggers related vs. unrelated
 282                          * compounded requests
 283                          */
 284                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 285                                 compound_related = true;
 286                         }
 287                 } else if (idx > 4) {
 288 #if 0
 289                         /*
 290                          * It seems the this tests are wrong
 291                          * see the SMB2-COMPOUND test
 292                          */
 293
 294                         /*
 295                          * all other requests should match the 2nd one
 296                          */
 297                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 298                                 if (!compound_related) {
 299                                         req->next_status =
 300                                                 NT_STATUS_INVALID_PARAMETER;
 301                                         return NT_STATUS_OK;
 302                                 }
 303                         } else {
 304                                 if (compound_related) {
 305                                         req->next_status =
 306                                                 NT_STATUS_INVALID_PARAMETER;
 307                                         return NT_STATUS_OK;
 308                                 }
 309                         }
 310 #endif
 311                 }
 312         }
 313
 314         return NT_STATUS_OK;
 315 }
 316
 317 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 318 {
 319         struct iovec *vector;
 320         int count;
 321         int idx;
 322
 323         count = req->in.vector_count;
 324         vector = talloc_array(req, struct iovec, count);
 325         if (vector == NULL) {
 326                 return NT_STATUS_NO_MEMORY;
 327         }
 328
 329         vector[0].iov_base      = req->out.nbt_hdr;
 330         vector[0].iov_len       = 4;
 331         SIVAL(req->out.nbt_hdr, 0, 0);
 332
 333         for (idx=1; idx < count; idx += 3) {
 334                 const uint8_t *inhdr = NULL;
 335                 uint32_t in_flags;
 336                 uint8_t *outhdr = NULL;
 337                 uint8_t *outbody = NULL;
 338                 uint32_t next_command_ofs = 0;
 339                 struct iovec *current = &vector[idx];
 340
 341                 if ((idx + 3) < count) {
 342                         /* we have a next command */
 343                         next_command_ofs = SMB2_HDR_BODY + 8;
 344                 }
 345
 346                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 347                 in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 348
 349                 outhdr = talloc_array(vector, uint8_t,
 350                                       SMB2_HDR_BODY + 8);
 351                 if (outhdr == NULL) {
 352                         return NT_STATUS_NO_MEMORY;
 353                 }
 354
 355                 outbody = outhdr + SMB2_HDR_BODY;
 356
 357                 current[0].iov_base     = (void *)outhdr;
 358                 current[0].iov_len      = SMB2_HDR_BODY;
 359
 360                 current[1].iov_base     = (void *)outbody;
 361                 current[1].iov_len      = 8;
 362
 363                 current[2].iov_base     = NULL;
 364                 current[2].iov_len      = 0;
 365
 366                 /* setup the SMB2 header */
 367                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 368                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 369                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 370                 SIVAL(outhdr, SMB2_HDR_STATUS,
 371                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 372                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 373                       SVAL(inhdr, SMB2_HDR_OPCODE));
 374                 /* Make up a number for now... JRA. FIXME ! FIXME !*/
 375                 SSVAL(outhdr, SMB2_HDR_CREDIT,          20);
 376                 SIVAL(outhdr, SMB2_HDR_FLAGS,
 377                       IVAL(inhdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_REDIRECT);
 378                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 379                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 380                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 381                 SIVAL(outhdr, SMB2_HDR_PID,
 382                       IVAL(inhdr, SMB2_HDR_PID));
 383                 SIVAL(outhdr, SMB2_HDR_TID,
 384                       IVAL(inhdr, SMB2_HDR_TID));
 385                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 386                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 387                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 388
 389                 /* setup error body header */
 390                 SSVAL(outbody, 0x00, 0x08 + 1);
 391                 SSVAL(outbody, 0x02, 0);
 392                 SIVAL(outbody, 0x04, 0);
 393         }
 394
 395         req->out.vector = vector;
 396         req->out.vector_count = count;
 397
 398         /* setup the length of the NBT packet */
 399         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 400
 401         DLIST_ADD_END(req->sconn->smb2.requests, req, struct smbd_smb2_request *);
 402
 403         return NT_STATUS_OK;
 404 }
 405
 406 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
 407                                          const char *reason,
 408                                          const char *location)
 409 {
 410         DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
 411                   reason, location));
 412         exit_server_cleanly(reason);
 413 }
 414
 415 struct smbd_smb2_request_pending_state {
 416         struct smbd_server_connection *sconn;
 417         uint8_t buf[4 + SMB2_HDR_BODY + 0x08];
 418         struct iovec vector;
 419 };
 420
 421 static void smbd_smb2_request_pending_writev_done(struct tevent_req *subreq);
 422
 423 NTSTATUS smbd_smb2_request_pending_queue(struct smbd_smb2_request *req)
 424 {
 425         struct smbd_smb2_request_pending_state *state;
 426         struct tevent_req *subreq;
 427         uint8_t *outhdr;
 428         int i = req->current_idx;
 429         uint32_t flags;
 430         uint64_t message_id;
 431         uint64_t async_id;
 432         uint8_t *hdr;
 433         uint8_t *body;
 434
 435         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 436
 437         flags = IVAL(outhdr, SMB2_HDR_FLAGS);
 438         message_id = BVAL(outhdr, SMB2_HDR_MESSAGE_ID);
 439
 440         async_id = message_id; /* keep it simple for now... */
 441         SIVAL(outhdr, SMB2_HDR_FLAGS,   flags | SMB2_HDR_FLAG_ASYNC);
 442         SBVAL(outhdr, SMB2_HDR_PID,     async_id);
 443
 444         /* TODO: add a paramter to delay this */
 445         state = talloc(req->sconn, struct smbd_smb2_request_pending_state);
 446         if (state == NULL) {
 447                 return NT_STATUS_NO_MEMORY;
 448         }
 449         state->sconn = req->sconn;
 450
 451         state->vector.iov_base = (void *)state->buf;
 452         state->vector.iov_len = sizeof(state->buf);
 453
 454         _smb2_setlen(state->buf, sizeof(state->buf) - 4);
 455         hdr = state->buf + 4;
 456         body = hdr + SMB2_HDR_BODY;
 457
 458         SIVAL(hdr, SMB2_HDR_PROTOCOL_ID,        SMB2_MAGIC);
 459         SSVAL(hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
 460         SSVAL(hdr, SMB2_HDR_EPOCH,              0);
 461         SIVAL(hdr, SMB2_HDR_STATUS,             NT_STATUS_V(STATUS_PENDING));
 462         SSVAL(hdr, SMB2_HDR_OPCODE,
 463               SVAL(outhdr, SMB2_HDR_OPCODE));
 464         SSVAL(hdr, SMB2_HDR_CREDIT,             1);
 465         SIVAL(hdr, SMB2_HDR_FLAGS,
 466               IVAL(outhdr, SMB2_HDR_FLAGS));
 467         SIVAL(hdr, SMB2_HDR_NEXT_COMMAND,       0);
 468         SBVAL(hdr, SMB2_HDR_MESSAGE_ID,
 469               BVAL(outhdr, SMB2_HDR_MESSAGE_ID));
 470         SBVAL(hdr, SMB2_HDR_PID,
 471               BVAL(outhdr, SMB2_HDR_PID));
 472         SBVAL(hdr, SMB2_HDR_SESSION_ID,
 473               BVAL(outhdr, SMB2_HDR_SESSION_ID));
 474         memset(hdr+SMB2_HDR_SIGNATURE, 0, 16);
 475
 476         SSVAL(body, 0x00, 0x08 + 1);
 477
 478         SCVAL(body, 0x02, 0);
 479         SCVAL(body, 0x03, 0);
 480         SIVAL(body, 0x04, 0);
 481
 482         subreq = tstream_writev_queue_send(state,
 483                                            req->sconn->smb2.event_ctx,
 484                                            req->sconn->smb2.stream,
 485                                            req->sconn->smb2.send_queue,
 486                                            &state->vector, 1);
 487         if (subreq == NULL) {
 488                 return NT_STATUS_NO_MEMORY;
 489         }
 490         tevent_req_set_callback(subreq,
 491                                 smbd_smb2_request_pending_writev_done,
 492                                 state);
 493
 494         return NT_STATUS_OK;
 495 }
 496
 497 static void smbd_smb2_request_pending_writev_done(struct tevent_req *subreq)
 498 {
 499         struct smbd_smb2_request_pending_state *state =
 500                 tevent_req_callback_data(subreq,
 501                 struct smbd_smb2_request_pending_state);
 502         struct smbd_server_connection *sconn = state->sconn;
 503         int ret;
 504         int sys_errno;
 505
 506         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 507         TALLOC_FREE(subreq);
 508         if (ret == -1) {
 509                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 510                 smbd_server_connection_terminate(sconn, nt_errstr(status));
 511                 return;
 512         }
 513
 514         TALLOC_FREE(state);
 515 }
 516
 517 static NTSTATUS smbd_smb2_request_process_cancel(struct smbd_smb2_request *req)
 518 {
 519         struct smbd_server_connection *sconn = req->sconn;
 520         struct smbd_smb2_request *cur;
 521         const uint8_t *inhdr;
 522         int i = req->current_idx;
 523         uint32_t flags;
 524         uint64_t search_message_id;
 525         uint64_t search_async_id;
 526
 527         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 528
 529         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 530         search_message_id = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
 531         search_async_id = BVAL(inhdr, SMB2_HDR_PID);
 532
 533         /*
 534          * we don't need the request anymore
 535          * cancel requests never have a response
 536          */
 537         TALLOC_FREE(req);
 538
 539         for (cur = sconn->smb2.requests; cur; cur = cur->next) {
 540                 const uint8_t *outhdr;
 541                 uint64_t message_id;
 542                 uint64_t async_id;
 543
 544                 i = cur->current_idx;
 545
 546                 outhdr = (const uint8_t *)cur->out.vector[i].iov_base;
 547
 548                 message_id = BVAL(outhdr, SMB2_HDR_MESSAGE_ID);
 549                 async_id = BVAL(outhdr, SMB2_HDR_PID);
 550
 551                 if (flags & SMB2_HDR_FLAG_ASYNC) {
 552                         if (search_async_id == async_id) {
 553                                 break;
 554                         }
 555                 } else {
 556                         if (search_message_id == message_id) {
 557                                 break;
 558                         }
 559                 }
 560         }
 561
 562         if (cur) {
 563                 /* TODO: try to cancel the request */
 564         }
 565
 566         return NT_STATUS_OK;
 567 }
 568
 569 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 570 {
 571         const uint8_t *inhdr;
 572         int i = req->current_idx;
 573         uint16_t opcode;
 574         uint32_t flags;
 575         NTSTATUS status;
 576         NTSTATUS session_status;
 577         uint32_t allowed_flags;
 578
 579         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 580
 581         /* TODO: verify more things */
 582
 583         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 584         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 585         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 586
 587         allowed_flags = SMB2_HDR_FLAG_CHAINED |
 588                         SMB2_HDR_FLAG_SIGNED |
 589                         SMB2_HDR_FLAG_DFS;
 590         if (opcode == SMB2_OP_CANCEL) {
 591                 allowed_flags |= SMB2_HDR_FLAG_ASYNC;
 592         }
 593         if ((flags & ~allowed_flags) != 0) {
 594                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 595         }
 596
 597         session_status = smbd_smb2_request_check_session(req);
 598
 599         req->do_signing = false;
 600         if (flags & SMB2_HDR_FLAG_SIGNED) {
 601                 if (!NT_STATUS_IS_OK(session_status)) {
 602                         return smbd_smb2_request_error(req, session_status);
 603                 }
 604
 605                 req->do_signing = true;
 606                 status = smb2_signing_check_pdu(req->session->session_key,
 607                                                 &req->in.vector[i], 3);
 608                 if (!NT_STATUS_IS_OK(status)) {
 609                         return smbd_smb2_request_error(req, status);
 610                 }
 611         } else if (req->session && req->session->do_signing) {
 612                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 613         }
 614
 615         if (flags & SMB2_HDR_FLAG_CHAINED) {
 616                 /*
 617                  * This check is mostly for giving the correct error code
 618                  * for compounded requests.
 619                  *
 620                  * TODO: we may need to move this after the session
 621                  *       and tcon checks.
 622                  */
 623                 if (!NT_STATUS_IS_OK(req->next_status)) {
 624                         return smbd_smb2_request_error(req, req->next_status);
 625                 }
 626         } else {
 627                 req->compat_chain_fsp = NULL;
 628         }
 629
 630         switch (opcode) {
 631         case SMB2_OP_NEGPROT:
 632                 return smbd_smb2_request_process_negprot(req);
 633
 634         case SMB2_OP_SESSSETUP:
 635                 return smbd_smb2_request_process_sesssetup(req);
 636
 637         case SMB2_OP_LOGOFF:
 638                 if (!NT_STATUS_IS_OK(session_status)) {
 639                         return smbd_smb2_request_error(req, session_status);
 640                 }
 641                 return smbd_smb2_request_process_logoff(req);
 642
 643         case SMB2_OP_TCON:
 644                 if (!NT_STATUS_IS_OK(session_status)) {
 645                         return smbd_smb2_request_error(req, session_status);
 646                 }
 647                 status = smbd_smb2_request_check_session(req);
 648                 if (!NT_STATUS_IS_OK(status)) {
 649                         return smbd_smb2_request_error(req, status);
 650                 }
 651                 return smbd_smb2_request_process_tcon(req);
 652
 653         case SMB2_OP_TDIS:
 654                 if (!NT_STATUS_IS_OK(session_status)) {
 655                         return smbd_smb2_request_error(req, session_status);
 656                 }
 657                 status = smbd_smb2_request_check_tcon(req);
 658                 if (!NT_STATUS_IS_OK(status)) {
 659                         return smbd_smb2_request_error(req, status);
 660                 }
 661                 return smbd_smb2_request_process_tdis(req);
 662
 663         case SMB2_OP_CREATE:
 664                 if (!NT_STATUS_IS_OK(session_status)) {
 665                         return smbd_smb2_request_error(req, session_status);
 666                 }
 667                 status = smbd_smb2_request_check_tcon(req);
 668                 if (!NT_STATUS_IS_OK(status)) {
 669                         return smbd_smb2_request_error(req, status);
 670                 }
 671                 return smbd_smb2_request_process_create(req);
 672
 673         case SMB2_OP_CLOSE:
 674                 if (!NT_STATUS_IS_OK(session_status)) {
 675                         return smbd_smb2_request_error(req, session_status);
 676                 }
 677                 status = smbd_smb2_request_check_tcon(req);
 678                 if (!NT_STATUS_IS_OK(status)) {
 679                         return smbd_smb2_request_error(req, status);
 680                 }
 681                 return smbd_smb2_request_process_close(req);
 682
 683         case SMB2_OP_FLUSH:
 684                 if (!NT_STATUS_IS_OK(session_status)) {
 685                         return smbd_smb2_request_error(req, session_status);
 686                 }
 687                 status = smbd_smb2_request_check_tcon(req);
 688                 if (!NT_STATUS_IS_OK(status)) {
 689                         return smbd_smb2_request_error(req, status);
 690                 }
 691                 return smbd_smb2_request_process_flush(req);
 692
 693         case SMB2_OP_READ:
 694                 if (!NT_STATUS_IS_OK(session_status)) {
 695                         return smbd_smb2_request_error(req, session_status);
 696                 }
 697                 status = smbd_smb2_request_check_tcon(req);
 698                 if (!NT_STATUS_IS_OK(status)) {
 699                         return smbd_smb2_request_error(req, status);
 700                 }
 701                 return smbd_smb2_request_process_read(req);
 702
 703         case SMB2_OP_WRITE:
 704                 if (!NT_STATUS_IS_OK(session_status)) {
 705                         return smbd_smb2_request_error(req, session_status);
 706                 }
 707                 status = smbd_smb2_request_check_tcon(req);
 708                 if (!NT_STATUS_IS_OK(status)) {
 709                         return smbd_smb2_request_error(req, status);
 710                 }
 711                 return smbd_smb2_request_process_write(req);
 712
 713         case SMB2_OP_LOCK:
 714                 if (!NT_STATUS_IS_OK(session_status)) {
 715                         return smbd_smb2_request_error(req, session_status);
 716                 }
 717                 status = smbd_smb2_request_check_tcon(req);
 718                 if (!NT_STATUS_IS_OK(status)) {
 719                         return smbd_smb2_request_error(req, status);
 720                 }
 721                 return smbd_smb2_request_process_lock(req);
 722
 723         case SMB2_OP_IOCTL:
 724                 if (!NT_STATUS_IS_OK(session_status)) {
 725                         return smbd_smb2_request_error(req, session_status);
 726                 }
 727                 status = smbd_smb2_request_check_tcon(req);
 728                 if (!NT_STATUS_IS_OK(status)) {
 729                         return smbd_smb2_request_error(req, status);
 730                 }
 731                 return smbd_smb2_request_process_ioctl(req);
 732
 733         case SMB2_OP_CANCEL:
 734                 return smbd_smb2_request_process_cancel(req);
 735
 736         case SMB2_OP_KEEPALIVE:
 737                 return smbd_smb2_request_process_keepalive(req);
 738
 739         case SMB2_OP_FIND:
 740                 if (!NT_STATUS_IS_OK(session_status)) {
 741                         return smbd_smb2_request_error(req, session_status);
 742                 }
 743                 status = smbd_smb2_request_check_tcon(req);
 744                 if (!NT_STATUS_IS_OK(status)) {
 745                         return smbd_smb2_request_error(req, status);
 746                 }
 747                 return smbd_smb2_request_process_find(req);
 748
 749         case SMB2_OP_NOTIFY:
 750                 if (!NT_STATUS_IS_OK(session_status)) {
 751                         return smbd_smb2_request_error(req, session_status);
 752                 }
 753                 status = smbd_smb2_request_check_tcon(req);
 754                 if (!NT_STATUS_IS_OK(status)) {
 755                         return smbd_smb2_request_error(req, status);
 756                 }
 757                 return smbd_smb2_request_process_notify(req);
 758
 759         case SMB2_OP_GETINFO:
 760                 if (!NT_STATUS_IS_OK(session_status)) {
 761                         return smbd_smb2_request_error(req, session_status);
 762                 }
 763                 status = smbd_smb2_request_check_tcon(req);
 764                 if (!NT_STATUS_IS_OK(status)) {
 765                         return smbd_smb2_request_error(req, status);
 766                 }
 767                 return smbd_smb2_request_process_getinfo(req);
 768
 769         case SMB2_OP_SETINFO:
 770                 if (!NT_STATUS_IS_OK(session_status)) {
 771                         return smbd_smb2_request_error(req, session_status);
 772                 }
 773                 status = smbd_smb2_request_check_tcon(req);
 774                 if (!NT_STATUS_IS_OK(status)) {
 775                         return smbd_smb2_request_error(req, status);
 776                 }
 777                 return smbd_smb2_request_process_setinfo(req);
 778
 779         case SMB2_OP_BREAK:
 780                 if (!NT_STATUS_IS_OK(session_status)) {
 781                         return smbd_smb2_request_error(req, session_status);
 782                 }
 783                 status = smbd_smb2_request_check_tcon(req);
 784                 if (!NT_STATUS_IS_OK(status)) {
 785                         return smbd_smb2_request_error(req, status);
 786                 }
 787                 return smbd_smb2_request_process_break(req);
 788         }
 789
 790         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 791 }
 792
 793 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 794 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 795
 796 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 797 {
 798         struct tevent_req *subreq;
 799
 800         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 801
 802         if (req->do_signing) {
 803                 int i = req->current_idx;
 804                 NTSTATUS status;
 805                 status = smb2_signing_sign_pdu(req->session->session_key,
 806                                                &req->out.vector[i], 3);
 807                 if (!NT_STATUS_IS_OK(status)) {
 808                         return status;
 809                 }
 810         }
 811
 812         req->current_idx += 3;
 813
 814         if (req->current_idx < req->out.vector_count) {
 815                 struct timeval zero = timeval_zero();
 816                 subreq = tevent_wakeup_send(req,
 817                                             req->sconn->smb2.event_ctx,
 818                                             zero);
 819                 if (subreq == NULL) {
 820                         return NT_STATUS_NO_MEMORY;
 821                 }
 822                 tevent_req_set_callback(subreq,
 823                                         smbd_smb2_request_dispatch_compound,
 824                                         req);
 825
 826                 return NT_STATUS_OK;
 827         }
 828
 829         subreq = tstream_writev_queue_send(req,
 830                                            req->sconn->smb2.event_ctx,
 831                                            req->sconn->smb2.stream,
 832                                            req->sconn->smb2.send_queue,
 833                                            req->out.vector,
 834                                            req->out.vector_count);
 835         if (subreq == NULL) {
 836                 return NT_STATUS_NO_MEMORY;
 837         }
 838         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 839
 840         return NT_STATUS_OK;
 841 }
 842
 843 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 844 {
 845         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 846                                         struct smbd_smb2_request);
 847         struct smbd_server_connection *sconn = req->sconn;
 848         NTSTATUS status;
 849
 850         tevent_wakeup_recv(subreq);
 851         TALLOC_FREE(subreq);
 852
 853         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 854                   req->current_idx, req->in.vector_count));
 855
 856         status = smbd_smb2_request_dispatch(req);
 857         if (!NT_STATUS_IS_OK(status)) {
 858                 smbd_server_connection_terminate(sconn, nt_errstr(status));
 859                 return;
 860         }
 861 }
 862
 863 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 864 {
 865         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 866                                         struct smbd_smb2_request);
 867         struct smbd_server_connection *sconn = req->sconn;
 868         int ret;
 869         int sys_errno;
 870
 871         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 872         TALLOC_FREE(subreq);
 873         TALLOC_FREE(req);
 874         if (ret == -1) {
 875                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 876                 smbd_server_connection_terminate(sconn, nt_errstr(status));
 877                 return;
 878         }
 879 }
 880
 881 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 882                                     NTSTATUS status,
 883                                     DATA_BLOB *info,
 884                                     const char *location)
 885 {
 886         uint8_t *outhdr;
 887         uint8_t *outbody;
 888         int i = req->current_idx;
 889
 890         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 891                   i, nt_errstr(status), info ? " +info" : "",
 892                   location));
 893
 894         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 895
 896         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 897
 898         outbody = outhdr + SMB2_HDR_BODY;
 899
 900         req->out.vector[i+1].iov_base = (void *)outbody;
 901         req->out.vector[i+1].iov_len = 8;
 902
 903         if (info) {
 904                 SIVAL(outbody, 0x04, info->length);
 905                 req->out.vector[i+2].iov_base   = (void *)info->data;
 906                 req->out.vector[i+2].iov_len    = info->length;
 907         } else {
 908                 req->out.vector[i+2].iov_base = NULL;
 909                 req->out.vector[i+2].iov_len = 0;
 910         }
 911
 912         /*
 913          * if a request fails, all other remaining
 914          * compounded requests should fail too
 915          */
 916         req->next_status = NT_STATUS_INVALID_PARAMETER;
 917
 918         return smbd_smb2_request_reply(req);
 919 }
 920
 921 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 922                                    NTSTATUS status,
 923                                    DATA_BLOB body, DATA_BLOB *dyn,
 924                                    const char *location)
 925 {
 926         uint8_t *outhdr;
 927         uint8_t *outdyn;
 928         int i = req->current_idx;
 929         uint32_t next_command_ofs;
 930
 931         DEBUG(10,("smbd_smb2_request_done_ex: "
 932                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 933                   i, nt_errstr(status), (unsigned int)body.length,
 934                   dyn ? "yes": "no",
 935                   (unsigned int)(dyn ? dyn->length : 0),
 936                   location));
 937
 938         if (body.length < 2) {
 939                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 940         }
 941
 942         if ((body.length % 2) != 0) {
 943                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 944         }
 945
 946         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 947         /* the fallback dynamic buffer */
 948         outdyn = outhdr + SMB2_HDR_BODY + 8;
 949
 950         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 951         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 952
 953         req->out.vector[i+1].iov_base = (void *)body.data;
 954         req->out.vector[i+1].iov_len = body.length;
 955
 956         if (dyn) {
 957                 req->out.vector[i+2].iov_base   = (void *)dyn->data;
 958                 req->out.vector[i+2].iov_len    = dyn->length;
 959         } else {
 960                 req->out.vector[i+2].iov_base = NULL;
 961                 req->out.vector[i+2].iov_len = 0;
 962         }
 963
 964         /* see if we need to recalculate the offset to the next response */
 965         if (next_command_ofs > 0) {
 966                 next_command_ofs  = SMB2_HDR_BODY;
 967                 next_command_ofs += req->out.vector[i+1].iov_len;
 968                 next_command_ofs += req->out.vector[i+2].iov_len;
 969         }
 970
 971         if ((next_command_ofs % 8) != 0) {
 972                 size_t pad_size = 8 - (next_command_ofs % 8);
 973                 if (req->out.vector[i+2].iov_len == 0) {
 974                         /*
 975                          * if the dyn buffer is empty
 976                          * we can use it to add padding
 977                          */
 978                         uint8_t *pad;
 979
 980                         pad = talloc_zero_array(req->out.vector,
 981                                                 uint8_t, pad_size);
 982                         if (pad == NULL) {
 983                                 return smbd_smb2_request_error(req,
 984                                                 NT_STATUS_NO_MEMORY);
 985                         }
 986
 987                         req->out.vector[i+2].iov_base = (void *)pad;
 988                         req->out.vector[i+2].iov_len = pad_size;
 989                 } else {
 990                         /*
 991                          * For now we copy the dynamic buffer
 992                          * and add the padding to the new buffer
 993                          */
 994                         size_t old_size;
 995                         uint8_t *old_dyn;
 996                         size_t new_size;
 997                         uint8_t *new_dyn;
 998
 999                         old_size = req->out.vector[i+2].iov_len;
1000                         old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
1001
1002                         new_size = old_size + pad_size;
1003                         new_dyn = talloc_array(req->out.vector,
1004                                                uint8_t, new_size);
1005                         if (new_dyn == NULL) {
1006                                 return smbd_smb2_request_error(req,
1007                                                 NT_STATUS_NO_MEMORY);
1008                         }
1009
1010                         memcpy(new_dyn, old_dyn, old_size);
1011                         memset(new_dyn + old_size, 0, pad_size);
1012
1013                         req->out.vector[i+2].iov_base = (void *)new_dyn;
1014                         req->out.vector[i+2].iov_len = new_size;
1015
1016                         TALLOC_FREE(old_dyn);
1017                 }
1018                 next_command_ofs += pad_size;
1019         }
1020
1021         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
1022
1023         return smbd_smb2_request_reply(req);
1024 }
1025
1026 struct smbd_smb2_send_oplock_break_state {
1027         struct smbd_server_connection *sconn;
1028         uint8_t buf[4 + SMB2_HDR_BODY + 0x18];
1029         struct iovec vector;
1030 };
1031
1032 static void smbd_smb2_oplock_break_writev_done(struct tevent_req *subreq);
1033
1034 NTSTATUS smbd_smb2_send_oplock_break(struct smbd_server_connection *sconn,
1035                                      uint64_t file_id_persistent,
1036                                      uint64_t file_id_volatile,
1037                                      uint8_t oplock_level)
1038 {
1039         struct smbd_smb2_send_oplock_break_state *state;
1040         struct tevent_req *subreq;
1041         uint8_t *hdr;
1042         uint8_t *body;
1043
1044         state = talloc(sconn, struct smbd_smb2_send_oplock_break_state);
1045         if (state == NULL) {
1046                 return NT_STATUS_NO_MEMORY;
1047         }
1048         state->sconn = sconn;
1049
1050         state->vector.iov_base = (void *)state->buf;
1051         state->vector.iov_len = sizeof(state->buf);
1052
1053         _smb2_setlen(state->buf, sizeof(state->buf) - 4);
1054         hdr = state->buf + 4;
1055         body = hdr + SMB2_HDR_BODY;
1056
1057         SIVAL(hdr, 0,                           SMB2_MAGIC);
1058         SSVAL(hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
1059         SSVAL(hdr, SMB2_HDR_EPOCH,              0);
1060         SIVAL(hdr, SMB2_HDR_STATUS,             0);
1061         SSVAL(hdr, SMB2_HDR_OPCODE,             SMB2_OP_BREAK);
1062         SSVAL(hdr, SMB2_HDR_CREDIT,             0);
1063         SIVAL(hdr, SMB2_HDR_FLAGS,              SMB2_HDR_FLAG_REDIRECT);
1064         SIVAL(hdr, SMB2_HDR_NEXT_COMMAND,       0);
1065         SBVAL(hdr, SMB2_HDR_MESSAGE_ID,         UINT64_MAX);
1066         SIVAL(hdr, SMB2_HDR_PID,                0);
1067         SIVAL(hdr, SMB2_HDR_TID,                0);
1068         SBVAL(hdr, SMB2_HDR_SESSION_ID,         0);
1069         memset(hdr+SMB2_HDR_SIGNATURE, 0, 16);
1070
1071         SSVAL(body, 0x00, 0x18);
1072
1073         SCVAL(body, 0x02, oplock_level);
1074         SCVAL(body, 0x03, 0);           /* reserved */
1075         SIVAL(body, 0x04, 0);           /* reserved */
1076         SBVAL(body, 0x08, file_id_persistent);
1077         SBVAL(body, 0x10, file_id_volatile);
1078
1079         subreq = tstream_writev_queue_send(state,
1080                                            sconn->smb2.event_ctx,
1081                                            sconn->smb2.stream,
1082                                            sconn->smb2.send_queue,
1083                                            &state->vector, 1);
1084         if (subreq == NULL) {
1085                 return NT_STATUS_NO_MEMORY;
1086         }
1087         tevent_req_set_callback(subreq,
1088                                 smbd_smb2_oplock_break_writev_done,
1089                                 state);
1090
1091         return NT_STATUS_OK;
1092 }
1093
1094 static void smbd_smb2_oplock_break_writev_done(struct tevent_req *subreq)
1095 {
1096         struct smbd_smb2_send_oplock_break_state *state =
1097                 tevent_req_callback_data(subreq,
1098                 struct smbd_smb2_send_oplock_break_state);
1099         struct smbd_server_connection *sconn = state->sconn;
1100         int ret;
1101         int sys_errno;
1102
1103         ret = tstream_writev_queue_recv(subreq, &sys_errno);
1104         TALLOC_FREE(subreq);
1105         if (ret == -1) {
1106                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
1107                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1108                 return;
1109         }
1110
1111         TALLOC_FREE(state);
1112 }
1113
1114 struct smbd_smb2_request_read_state {
1115         size_t missing;
1116         bool asked_for_header;
1117         struct smbd_smb2_request *smb2_req;
1118 };
1119
1120 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
1121                                          void *private_data,
1122                                          TALLOC_CTX *mem_ctx,
1123                                          struct iovec **_vector,
1124                                          size_t *_count);
1125 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
1126
1127 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
1128                                         struct tevent_context *ev,
1129                                         struct smbd_server_connection *sconn)
1130 {
1131         struct tevent_req *req;
1132         struct smbd_smb2_request_read_state *state;
1133         struct tevent_req *subreq;
1134
1135         req = tevent_req_create(mem_ctx, &state,
1136                                 struct smbd_smb2_request_read_state);
1137         if (req == NULL) {
1138                 return NULL;
1139         }
1140         state->missing = 0;
1141         state->asked_for_header = false;
1142
1143         state->smb2_req = smbd_smb2_request_allocate(state);
1144         if (tevent_req_nomem(state->smb2_req, req)) {
1145                 return tevent_req_post(req, ev);
1146         }
1147         state->smb2_req->sconn = sconn;
1148
1149         subreq = tstream_readv_pdu_queue_send(state, ev, sconn->smb2.stream,
1150                                               sconn->smb2.recv_queue,
1151                                               smbd_smb2_request_next_vector,
1152                                               state);
1153         if (tevent_req_nomem(subreq, req)) {
1154                 return tevent_req_post(req, ev);
1155         }
1156         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
1157
1158         return req;
1159 }
1160
1161 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
1162                                          void *private_data,
1163                                          TALLOC_CTX *mem_ctx,
1164                                          struct iovec **_vector,
1165                                          size_t *_count)
1166 {
1167         struct smbd_smb2_request_read_state *state =
1168                 talloc_get_type_abort(private_data,
1169                 struct smbd_smb2_request_read_state);
1170         struct smbd_smb2_request *req = state->smb2_req;
1171         struct iovec *vector;
1172         int idx = req->in.vector_count;
1173         size_t len = 0;
1174         uint8_t *buf = NULL;
1175
1176         if (req->in.vector_count == 0) {
1177                 /*
1178                  * first we need to get the NBT header
1179                  */
1180                 req->in.vector = talloc_array(req, struct iovec,
1181                                               req->in.vector_count + 1);
1182                 if (req->in.vector == NULL) {
1183                         return -1;
1184                 }
1185                 req->in.vector_count += 1;
1186
1187                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
1188                 req->in.vector[idx].iov_len     = 4;
1189
1190                 vector = talloc_array(mem_ctx, struct iovec, 1);
1191                 if (vector == NULL) {
1192                         return -1;
1193                 }
1194
1195                 vector[0] = req->in.vector[idx];
1196
1197                 *_vector = vector;
1198                 *_count = 1;
1199                 return 0;
1200         }
1201
1202         if (req->in.vector_count == 1) {
1203                 /*
1204                  * Now we analyze the NBT header
1205                  */
1206                 state->missing = smb2_len(req->in.vector[0].iov_base);
1207
1208                 if (state->missing == 0) {
1209                         /* if there're no remaining bytes, we're done */
1210                         *_vector = NULL;
1211                         *_count = 0;
1212                         return 0;
1213                 }
1214
1215                 req->in.vector = talloc_realloc(req, req->in.vector,
1216                                                 struct iovec,
1217                                                 req->in.vector_count + 1);
1218                 if (req->in.vector == NULL) {
1219                         return -1;
1220                 }
1221                 req->in.vector_count += 1;
1222
1223                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
1224                         /*
1225                          * it's a special NBT message,
1226                          * so get all remaining bytes
1227                          */
1228                         len = state->missing;
1229                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
1230                         /*
1231                          * it's an invalid message, just read what we can get
1232                          * and let the caller handle the error
1233                          */
1234                         len = state->missing;
1235                 } else {
1236                         /*
1237                          * We assume it's a SMB2 request,
1238                          * and we first get the header and the
1239                          * first 2 bytes (the struct size) of the body
1240                          */
1241                         len = SMB2_HDR_BODY + 2;
1242
1243                         state->asked_for_header = true;
1244                 }
1245
1246                 state->missing -= len;
1247
1248                 buf = talloc_array(req->in.vector, uint8_t, len);
1249                 if (buf == NULL) {
1250                         return -1;
1251                 }
1252
1253                 req->in.vector[idx].iov_base    = (void *)buf;
1254                 req->in.vector[idx].iov_len     = len;
1255
1256                 vector = talloc_array(mem_ctx, struct iovec, 1);
1257                 if (vector == NULL) {
1258                         return -1;
1259                 }
1260
1261                 vector[0] = req->in.vector[idx];
1262
1263                 *_vector = vector;
1264                 *_count = 1;
1265                 return 0;
1266         }
1267
1268         if (state->missing == 0) {
1269                 /* if there're no remaining bytes, we're done */
1270                 *_vector = NULL;
1271                 *_count = 0;
1272                 return 0;
1273         }
1274
1275         if (state->asked_for_header) {
1276                 const uint8_t *hdr;
1277                 size_t full_size;
1278                 size_t next_command_ofs;
1279                 size_t body_size;
1280                 uint8_t *body;
1281                 size_t dyn_size;
1282                 uint8_t *dyn;
1283                 bool invalid = false;
1284
1285                 state->asked_for_header = false;
1286
1287                 /*
1288                  * We got the SMB2 header and the first 2 bytes
1289                  * of the body. We fix the size to just the header
1290                  * and manually copy the 2 first bytes to the body section
1291                  */
1292                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
1293                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
1294
1295                 /* allocate vectors for body and dynamic areas */
1296                 req->in.vector = talloc_realloc(req, req->in.vector,
1297                                                 struct iovec,
1298                                                 req->in.vector_count + 2);
1299                 if (req->in.vector == NULL) {
1300                         return -1;
1301                 }
1302                 req->in.vector_count += 2;
1303
1304                 full_size = state->missing + SMB2_HDR_BODY + 2;
1305                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1306                 body_size = SVAL(hdr, SMB2_HDR_BODY);
1307
1308                 if (next_command_ofs != 0) {
1309                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1310                                 /*
1311                                  * this is invalid, just return a zero
1312                                  * body and let the caller deal with the error
1313                                  */
1314                                 invalid = true;
1315                         } else if (next_command_ofs > full_size) {
1316                                 /*
1317                                  * this is invalid, just return a zero
1318                                  * body and let the caller deal with the error
1319                                  */
1320                                 invalid = true;
1321                         } else {
1322                                 full_size = next_command_ofs;
1323                         }
1324                 }
1325
1326                 if (!invalid) {
1327                         if (body_size < 2) {
1328                                 /*
1329                                  * this is invalid, just return a zero
1330                                  * body and let the caller deal with the error
1331                                  */
1332                                 invalid = true;
1333                         }
1334
1335                         if ((body_size % 2) != 0) {
1336                                 body_size -= 1;
1337                         }
1338
1339                         if (body_size > (full_size - SMB2_HDR_BODY)) {
1340                                 /*
1341                                  * this is invalid, just return a zero
1342                                  * body and let the caller deal with the error
1343                                  */
1344                                 invalid = true;
1345                         }
1346                 }
1347
1348                 if (invalid) {
1349                         /* the caller should check this */
1350                         body_size = 2;
1351                 }
1352
1353                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1354
1355                 state->missing -= (body_size - 2) + dyn_size;
1356
1357                 body = talloc_array(req->in.vector, uint8_t, body_size);
1358                 if (body == NULL) {
1359                         return -1;
1360                 }
1361
1362                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1363                 if (dyn == NULL) {
1364                         return -1;
1365                 }
1366
1367                 req->in.vector[idx].iov_base    = (void *)body;
1368                 req->in.vector[idx].iov_len     = body_size;
1369                 req->in.vector[idx+1].iov_base  = (void *)dyn;
1370                 req->in.vector[idx+1].iov_len   = dyn_size;
1371
1372                 vector = talloc_array(mem_ctx, struct iovec, 2);
1373                 if (vector == NULL) {
1374                         return -1;
1375                 }
1376
1377                 /*
1378                  * the first 2 bytes of the body were already fetched
1379                  * together with the header
1380                  */
1381                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1382                 vector[0].iov_base = body + 2;
1383                 vector[0].iov_len = body_size - 2;
1384
1385                 vector[1] = req->in.vector[idx+1];
1386
1387                 *_vector = vector;
1388                 *_count = 2;
1389                 return 0;
1390         }
1391
1392         /*
1393          * when we endup here, we're looking for a new SMB2 request
1394          * next. And we ask for its header and the first 2 bytes of
1395          * the body (like we did for the first SMB2 request).
1396          */
1397
1398         req->in.vector = talloc_realloc(req, req->in.vector,
1399                                         struct iovec,
1400                                         req->in.vector_count + 1);
1401         if (req->in.vector == NULL) {
1402                 return -1;
1403         }
1404         req->in.vector_count += 1;
1405
1406         /*
1407          * We assume it's a SMB2 request,
1408          * and we first get the header and the
1409          * first 2 bytes (the struct size) of the body
1410          */
1411         len = SMB2_HDR_BODY + 2;
1412
1413         if (len > state->missing) {
1414                 /* let the caller handle the error */
1415                 len = state->missing;
1416         }
1417
1418         state->missing -= len;
1419         state->asked_for_header = true;
1420
1421         buf = talloc_array(req->in.vector, uint8_t, len);
1422         if (buf == NULL) {
1423                 return -1;
1424         }
1425
1426         req->in.vector[idx].iov_base    = (void *)buf;
1427         req->in.vector[idx].iov_len     = len;
1428
1429         vector = talloc_array(mem_ctx, struct iovec, 1);
1430         if (vector == NULL) {
1431                 return -1;
1432         }
1433
1434         vector[0] = req->in.vector[idx];
1435
1436         *_vector = vector;
1437         *_count = 1;
1438         return 0;
1439 }
1440
1441 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1442 {
1443         struct tevent_req *req =
1444                 tevent_req_callback_data(subreq,
1445                 struct tevent_req);
1446         int ret;
1447         int sys_errno;
1448         NTSTATUS status;
1449
1450         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1451         if (ret == -1) {
1452                 status = map_nt_error_from_unix(sys_errno);
1453                 tevent_req_nterror(req, status);
1454                 return;
1455         }
1456
1457         tevent_req_done(req);
1458 }
1459
1460 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1461                                             TALLOC_CTX *mem_ctx,
1462                                             struct smbd_smb2_request **_smb2_req)
1463 {
1464         struct smbd_smb2_request_read_state *state =
1465                 tevent_req_data(req,
1466                 struct smbd_smb2_request_read_state);
1467         NTSTATUS status;
1468
1469         if (tevent_req_is_nterror(req, &status)) {
1470                 tevent_req_received(req);
1471                 return status;
1472         }
1473
1474         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1475         *_smb2_req = state->smb2_req;
1476         tevent_req_received(req);
1477         return NT_STATUS_OK;
1478 }
1479
1480 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1481
1482 void smbd_smb2_first_negprot(struct smbd_server_connection *sconn,
1483                              const uint8_t *inbuf, size_t size)
1484 {
1485         NTSTATUS status;
1486         struct smbd_smb2_request *req;
1487         struct tevent_req *subreq;
1488
1489         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1490                  (unsigned int)size));
1491
1492         status = smbd_initialize_smb2(sconn);
1493         if (!NT_STATUS_IS_OK(status)) {
1494                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1495                 return;
1496         }
1497
1498         status = smbd_smb2_request_create(sconn, inbuf, size, &req);
1499         if (!NT_STATUS_IS_OK(status)) {
1500                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1501                 return;
1502         }
1503
1504         status = smbd_smb2_request_setup_out(req);
1505         if (!NT_STATUS_IS_OK(status)) {
1506                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1507                 return;
1508         }
1509
1510         status = smbd_smb2_request_dispatch(req);
1511         if (!NT_STATUS_IS_OK(status)) {
1512                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1513                 return;
1514         }
1515
1516         /* ask for the next request */
1517         subreq = smbd_smb2_request_read_send(sconn, sconn->smb2.event_ctx, sconn);
1518         if (subreq == NULL) {
1519                 smbd_server_connection_terminate(sconn, "no memory for reading");
1520                 return;
1521         }
1522         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, sconn);
1523 }
1524
1525 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1526 {
1527         struct smbd_server_connection *sconn = tevent_req_callback_data(subreq,
1528                                                struct smbd_server_connection);
1529         NTSTATUS status;
1530         struct smbd_smb2_request *req = NULL;
1531
1532         status = smbd_smb2_request_read_recv(subreq, sconn, &req);
1533         TALLOC_FREE(subreq);
1534         if (!NT_STATUS_IS_OK(status)) {
1535                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1536                 return;
1537         }
1538
1539         if (req->in.nbt_hdr[0] != 0x00) {
1540                 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1541                          req->in.nbt_hdr[0]));
1542                 TALLOC_FREE(req);
1543                 goto next;
1544         }
1545
1546         req->current_idx = 1;
1547
1548         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1549                  req->current_idx, req->in.vector_count));
1550
1551         status = smbd_smb2_request_validate(req);
1552         if (!NT_STATUS_IS_OK(status)) {
1553                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1554                 return;
1555         }
1556
1557         status = smbd_smb2_request_setup_out(req);
1558         if (!NT_STATUS_IS_OK(status)) {
1559                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1560                 return;
1561         }
1562
1563         status = smbd_smb2_request_dispatch(req);
1564         if (!NT_STATUS_IS_OK(status)) {
1565                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1566                 return;
1567         }
1568
1569 next:
1570         /* ask for the next request (this constructs the main loop) */
1571         subreq = smbd_smb2_request_read_send(sconn, sconn->smb2.event_ctx, sconn);
1572         if (subreq == NULL) {
1573                 smbd_server_connection_terminate(sconn, "no memory for reading");
1574                 return;
1575         }
1576         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, sconn);
1577 }