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 "../source4/libcli/smb2/smb2_constants.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 *conn)
  40 {
  41         NTSTATUS status;
  42         int ret;
  43
  44         TALLOC_FREE(conn->smb1.fde);
  45
  46         conn->smb2.event_ctx = smbd_event_context();
  47
  48         conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
  49         if (conn->smb2.recv_queue == NULL) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
  54         if (conn->smb2.send_queue == NULL) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         conn->smb2.sessions.idtree = idr_init(conn);
  59         if (conn->smb2.sessions.idtree == NULL) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62         conn->smb2.sessions.limit = 0x0000FFFE;
  63         conn->smb2.sessions.list = NULL;
  64
  65         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  66                                           &conn->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->conn->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 *conn,
 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(conn);
 194         if (req == NULL) {
 195                 return NT_STATUS_NO_MEMORY;
 196         }
 197         req->conn = conn;
 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->conn->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->conn, struct smbd_smb2_request_pending_state);
 446         if (state == NULL) {
 447                 return NT_STATUS_NO_MEMORY;
 448         }
 449         state->sconn = req->conn;
 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->conn->smb2.event_ctx,
 484                                            req->conn->smb2.stream,
 485                                            req->conn->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->conn;
 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
 578         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 579
 580         /* TODO: verify more things */
 581
 582         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 583         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 584         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 585
 586 #define TMP_SMB2_ALLOWED_FLAGS ( \
 587         SMB2_HDR_FLAG_CHAINED | \
 588         SMB2_HDR_FLAG_SIGNED | \
 589         SMB2_HDR_FLAG_DFS)
 590         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 591                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 592         }
 593 #undef TMP_SMB2_ALLOWED_FLAGS
 594
 595         session_status = smbd_smb2_request_check_session(req);
 596
 597         req->do_signing = false;
 598         if (flags & SMB2_HDR_FLAG_SIGNED) {
 599                 if (!NT_STATUS_IS_OK(session_status)) {
 600                         return smbd_smb2_request_error(req, session_status);
 601                 }
 602
 603                 req->do_signing = true;
 604                 status = smb2_signing_check_pdu(req->session->session_key,
 605                                                 &req->in.vector[i], 3);
 606                 if (!NT_STATUS_IS_OK(status)) {
 607                         return smbd_smb2_request_error(req, status);
 608                 }
 609         } else if (req->session && req->session->do_signing) {
 610                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 611         }
 612
 613         if (flags & SMB2_HDR_FLAG_CHAINED) {
 614                 /*
 615                  * This check is mostly for giving the correct error code
 616                  * for compounded requests.
 617                  *
 618                  * TODO: we may need to move this after the session
 619                  *       and tcon checks.
 620                  */
 621                 if (!NT_STATUS_IS_OK(req->next_status)) {
 622                         return smbd_smb2_request_error(req, req->next_status);
 623                 }
 624         } else {
 625                 req->compat_chain_fsp = NULL;
 626         }
 627
 628         switch (opcode) {
 629         case SMB2_OP_NEGPROT:
 630                 return smbd_smb2_request_process_negprot(req);
 631
 632         case SMB2_OP_SESSSETUP:
 633                 return smbd_smb2_request_process_sesssetup(req);
 634
 635         case SMB2_OP_LOGOFF:
 636                 if (!NT_STATUS_IS_OK(session_status)) {
 637                         return smbd_smb2_request_error(req, session_status);
 638                 }
 639                 return smbd_smb2_request_process_logoff(req);
 640
 641         case SMB2_OP_TCON:
 642                 if (!NT_STATUS_IS_OK(session_status)) {
 643                         return smbd_smb2_request_error(req, session_status);
 644                 }
 645                 status = smbd_smb2_request_check_session(req);
 646                 if (!NT_STATUS_IS_OK(status)) {
 647                         return smbd_smb2_request_error(req, status);
 648                 }
 649                 return smbd_smb2_request_process_tcon(req);
 650
 651         case SMB2_OP_TDIS:
 652                 if (!NT_STATUS_IS_OK(session_status)) {
 653                         return smbd_smb2_request_error(req, session_status);
 654                 }
 655                 status = smbd_smb2_request_check_tcon(req);
 656                 if (!NT_STATUS_IS_OK(status)) {
 657                         return smbd_smb2_request_error(req, status);
 658                 }
 659                 return smbd_smb2_request_process_tdis(req);
 660
 661         case SMB2_OP_CREATE:
 662                 if (!NT_STATUS_IS_OK(session_status)) {
 663                         return smbd_smb2_request_error(req, session_status);
 664                 }
 665                 status = smbd_smb2_request_check_tcon(req);
 666                 if (!NT_STATUS_IS_OK(status)) {
 667                         return smbd_smb2_request_error(req, status);
 668                 }
 669                 return smbd_smb2_request_process_create(req);
 670
 671         case SMB2_OP_CLOSE:
 672                 if (!NT_STATUS_IS_OK(session_status)) {
 673                         return smbd_smb2_request_error(req, session_status);
 674                 }
 675                 status = smbd_smb2_request_check_tcon(req);
 676                 if (!NT_STATUS_IS_OK(status)) {
 677                         return smbd_smb2_request_error(req, status);
 678                 }
 679                 return smbd_smb2_request_process_close(req);
 680
 681         case SMB2_OP_FLUSH:
 682                 if (!NT_STATUS_IS_OK(session_status)) {
 683                         return smbd_smb2_request_error(req, session_status);
 684                 }
 685                 status = smbd_smb2_request_check_tcon(req);
 686                 if (!NT_STATUS_IS_OK(status)) {
 687                         return smbd_smb2_request_error(req, status);
 688                 }
 689                 return smbd_smb2_request_process_flush(req);
 690
 691         case SMB2_OP_READ:
 692                 if (!NT_STATUS_IS_OK(session_status)) {
 693                         return smbd_smb2_request_error(req, session_status);
 694                 }
 695                 status = smbd_smb2_request_check_tcon(req);
 696                 if (!NT_STATUS_IS_OK(status)) {
 697                         return smbd_smb2_request_error(req, status);
 698                 }
 699                 return smbd_smb2_request_process_read(req);
 700
 701         case SMB2_OP_WRITE:
 702                 if (!NT_STATUS_IS_OK(session_status)) {
 703                         return smbd_smb2_request_error(req, session_status);
 704                 }
 705                 status = smbd_smb2_request_check_tcon(req);
 706                 if (!NT_STATUS_IS_OK(status)) {
 707                         return smbd_smb2_request_error(req, status);
 708                 }
 709                 return smbd_smb2_request_process_write(req);
 710
 711         case SMB2_OP_LOCK:
 712                 if (!NT_STATUS_IS_OK(session_status)) {
 713                         return smbd_smb2_request_error(req, session_status);
 714                 }
 715                 status = smbd_smb2_request_check_tcon(req);
 716                 if (!NT_STATUS_IS_OK(status)) {
 717                         return smbd_smb2_request_error(req, status);
 718                 }
 719                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 720
 721         case SMB2_OP_IOCTL:
 722                 if (!NT_STATUS_IS_OK(session_status)) {
 723                         return smbd_smb2_request_error(req, session_status);
 724                 }
 725                 status = smbd_smb2_request_check_tcon(req);
 726                 if (!NT_STATUS_IS_OK(status)) {
 727                         return smbd_smb2_request_error(req, status);
 728                 }
 729                 return smbd_smb2_request_process_ioctl(req);
 730
 731         case SMB2_OP_CANCEL:
 732                 return smbd_smb2_request_process_cancel(req);
 733
 734         case SMB2_OP_KEEPALIVE:
 735                 return smbd_smb2_request_process_keepalive(req);
 736
 737         case SMB2_OP_FIND:
 738                 if (!NT_STATUS_IS_OK(session_status)) {
 739                         return smbd_smb2_request_error(req, session_status);
 740                 }
 741                 status = smbd_smb2_request_check_tcon(req);
 742                 if (!NT_STATUS_IS_OK(status)) {
 743                         return smbd_smb2_request_error(req, status);
 744                 }
 745                 return smbd_smb2_request_process_find(req);
 746
 747         case SMB2_OP_NOTIFY:
 748                 if (!NT_STATUS_IS_OK(session_status)) {
 749                         return smbd_smb2_request_error(req, session_status);
 750                 }
 751                 status = smbd_smb2_request_check_tcon(req);
 752                 if (!NT_STATUS_IS_OK(status)) {
 753                         return smbd_smb2_request_error(req, status);
 754                 }
 755                 return smbd_smb2_request_process_notify(req);
 756
 757         case SMB2_OP_GETINFO:
 758                 if (!NT_STATUS_IS_OK(session_status)) {
 759                         return smbd_smb2_request_error(req, session_status);
 760                 }
 761                 status = smbd_smb2_request_check_tcon(req);
 762                 if (!NT_STATUS_IS_OK(status)) {
 763                         return smbd_smb2_request_error(req, status);
 764                 }
 765                 return smbd_smb2_request_process_getinfo(req);
 766
 767         case SMB2_OP_SETINFO:
 768                 if (!NT_STATUS_IS_OK(session_status)) {
 769                         return smbd_smb2_request_error(req, session_status);
 770                 }
 771                 status = smbd_smb2_request_check_tcon(req);
 772                 if (!NT_STATUS_IS_OK(status)) {
 773                         return smbd_smb2_request_error(req, status);
 774                 }
 775                 return smbd_smb2_request_process_setinfo(req);
 776
 777         case SMB2_OP_BREAK:
 778                 if (!NT_STATUS_IS_OK(session_status)) {
 779                         return smbd_smb2_request_error(req, session_status);
 780                 }
 781                 status = smbd_smb2_request_check_tcon(req);
 782                 if (!NT_STATUS_IS_OK(status)) {
 783                         return smbd_smb2_request_error(req, status);
 784                 }
 785                 return smbd_smb2_request_process_break(req);
 786         }
 787
 788         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 789 }
 790
 791 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 792 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 793
 794 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 795 {
 796         struct tevent_req *subreq;
 797
 798         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 799
 800         if (req->do_signing) {
 801                 int i = req->current_idx;
 802                 NTSTATUS status;
 803                 status = smb2_signing_sign_pdu(req->session->session_key,
 804                                                &req->out.vector[i], 3);
 805                 if (!NT_STATUS_IS_OK(status)) {
 806                         return status;
 807                 }
 808         }
 809
 810         req->current_idx += 3;
 811
 812         if (req->current_idx < req->out.vector_count) {
 813                 struct timeval zero = timeval_zero();
 814                 subreq = tevent_wakeup_send(req,
 815                                             req->conn->smb2.event_ctx,
 816                                             zero);
 817                 if (subreq == NULL) {
 818                         return NT_STATUS_NO_MEMORY;
 819                 }
 820                 tevent_req_set_callback(subreq,
 821                                         smbd_smb2_request_dispatch_compound,
 822                                         req);
 823
 824                 return NT_STATUS_OK;
 825         }
 826
 827         subreq = tstream_writev_queue_send(req,
 828                                            req->conn->smb2.event_ctx,
 829                                            req->conn->smb2.stream,
 830                                            req->conn->smb2.send_queue,
 831                                            req->out.vector,
 832                                            req->out.vector_count);
 833         if (subreq == NULL) {
 834                 return NT_STATUS_NO_MEMORY;
 835         }
 836         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 837
 838         return NT_STATUS_OK;
 839 }
 840
 841 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 842 {
 843         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 844                                         struct smbd_smb2_request);
 845         struct smbd_server_connection *conn = req->conn;
 846         NTSTATUS status;
 847
 848         tevent_wakeup_recv(subreq);
 849         TALLOC_FREE(subreq);
 850
 851         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 852                   req->current_idx, req->in.vector_count));
 853
 854         status = smbd_smb2_request_dispatch(req);
 855         if (!NT_STATUS_IS_OK(status)) {
 856                 smbd_server_connection_terminate(conn, nt_errstr(status));
 857                 return;
 858         }
 859 }
 860
 861 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 862 {
 863         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 864                                         struct smbd_smb2_request);
 865         struct smbd_server_connection *conn = req->conn;
 866         int ret;
 867         int sys_errno;
 868
 869         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 870         TALLOC_FREE(subreq);
 871         TALLOC_FREE(req);
 872         if (ret == -1) {
 873                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 874                 smbd_server_connection_terminate(conn, nt_errstr(status));
 875                 return;
 876         }
 877 }
 878
 879 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 880                                     NTSTATUS status,
 881                                     DATA_BLOB *info,
 882                                     const char *location)
 883 {
 884         uint8_t *outhdr;
 885         uint8_t *outbody;
 886         int i = req->current_idx;
 887
 888         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 889                   i, nt_errstr(status), info ? " +info" : "",
 890                   location));
 891
 892         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 893
 894         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 895
 896         outbody = outhdr + SMB2_HDR_BODY;
 897
 898         req->out.vector[i+1].iov_base = (void *)outbody;
 899         req->out.vector[i+1].iov_len = 8;
 900
 901         if (info) {
 902                 SIVAL(outbody, 0x04, info->length);
 903                 req->out.vector[i+2].iov_base   = (void *)info->data;
 904                 req->out.vector[i+2].iov_len    = info->length;
 905         } else {
 906                 req->out.vector[i+2].iov_base = NULL;
 907                 req->out.vector[i+2].iov_len = 0;
 908         }
 909
 910         /*
 911          * if a request fails, all other remaining
 912          * compounded requests should fail too
 913          */
 914         req->next_status = NT_STATUS_INVALID_PARAMETER;
 915
 916         return smbd_smb2_request_reply(req);
 917 }
 918
 919 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 920                                    NTSTATUS status,
 921                                    DATA_BLOB body, DATA_BLOB *dyn,
 922                                    const char *location)
 923 {
 924         uint8_t *outhdr;
 925         uint8_t *outdyn;
 926         int i = req->current_idx;
 927         uint32_t next_command_ofs;
 928
 929         DEBUG(10,("smbd_smb2_request_done_ex: "
 930                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 931                   i, nt_errstr(status), (unsigned int)body.length,
 932                   dyn ? "yes": "no",
 933                   (unsigned int)(dyn ? dyn->length : 0),
 934                   location));
 935
 936         if (body.length < 2) {
 937                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 938         }
 939
 940         if ((body.length % 2) != 0) {
 941                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 942         }
 943
 944         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 945         /* the fallback dynamic buffer */
 946         outdyn = outhdr + SMB2_HDR_BODY + 8;
 947
 948         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 949         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 950
 951         req->out.vector[i+1].iov_base = (void *)body.data;
 952         req->out.vector[i+1].iov_len = body.length;
 953
 954         if (dyn) {
 955                 req->out.vector[i+2].iov_base   = (void *)dyn->data;
 956                 req->out.vector[i+2].iov_len    = dyn->length;
 957         } else {
 958                 req->out.vector[i+2].iov_base = NULL;
 959                 req->out.vector[i+2].iov_len = 0;
 960         }
 961
 962         /* see if we need to recalculate the offset to the next response */
 963         if (next_command_ofs > 0) {
 964                 next_command_ofs  = SMB2_HDR_BODY;
 965                 next_command_ofs += req->out.vector[i+1].iov_len;
 966                 next_command_ofs += req->out.vector[i+2].iov_len;
 967         }
 968
 969         if ((next_command_ofs % 8) != 0) {
 970                 size_t pad_size = 8 - (next_command_ofs % 8);
 971                 if (req->out.vector[i+2].iov_len == 0) {
 972                         /*
 973                          * if the dyn buffer is empty
 974                          * we can use it to add padding
 975                          */
 976                         uint8_t *pad;
 977
 978                         pad = talloc_zero_array(req->out.vector,
 979                                                 uint8_t, pad_size);
 980                         if (pad == NULL) {
 981                                 return smbd_smb2_request_error(req,
 982                                                 NT_STATUS_NO_MEMORY);
 983                         }
 984
 985                         req->out.vector[i+2].iov_base = (void *)pad;
 986                         req->out.vector[i+2].iov_len = pad_size;
 987                 } else {
 988                         /*
 989                          * For now we copy the dynamic buffer
 990                          * and add the padding to the new buffer
 991                          */
 992                         size_t old_size;
 993                         uint8_t *old_dyn;
 994                         size_t new_size;
 995                         uint8_t *new_dyn;
 996
 997                         old_size = req->out.vector[i+2].iov_len;
 998                         old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
 999
1000                         new_size = old_size + pad_size;
1001                         new_dyn = talloc_array(req->out.vector,
1002                                                uint8_t, new_size);
1003                         if (new_dyn == NULL) {
1004                                 return smbd_smb2_request_error(req,
1005                                                 NT_STATUS_NO_MEMORY);
1006                         }
1007
1008                         memcpy(new_dyn, old_dyn, old_size);
1009                         memset(new_dyn + old_size, 0, pad_size);
1010
1011                         req->out.vector[i+2].iov_base = (void *)new_dyn;
1012                         req->out.vector[i+2].iov_len = new_size;
1013
1014                         TALLOC_FREE(old_dyn);
1015                 }
1016                 next_command_ofs += pad_size;
1017         }
1018
1019         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
1020
1021         return smbd_smb2_request_reply(req);
1022 }
1023
1024 struct smbd_smb2_send_oplock_break_state {
1025         struct smbd_server_connection *sconn;
1026         uint8_t buf[4 + SMB2_HDR_BODY + 0x18];
1027         struct iovec vector;
1028 };
1029
1030 static void smbd_smb2_oplock_break_writev_done(struct tevent_req *subreq);
1031
1032 NTSTATUS smbd_smb2_send_oplock_break(struct smbd_server_connection *sconn,
1033                                      uint64_t file_id_persistent,
1034                                      uint64_t file_id_volatile,
1035                                      uint8_t oplock_level)
1036 {
1037         struct smbd_smb2_send_oplock_break_state *state;
1038         struct tevent_req *subreq;
1039         uint8_t *hdr;
1040         uint8_t *body;
1041
1042         state = talloc(sconn, struct smbd_smb2_send_oplock_break_state);
1043         if (state == NULL) {
1044                 return NT_STATUS_NO_MEMORY;
1045         }
1046         state->sconn = sconn;
1047
1048         state->vector.iov_base = (void *)state->buf;
1049         state->vector.iov_len = sizeof(state->buf);
1050
1051         _smb2_setlen(state->buf, sizeof(state->buf) - 4);
1052         hdr = state->buf + 4;
1053         body = hdr + SMB2_HDR_BODY;
1054
1055         SIVAL(hdr, 0,                           SMB2_MAGIC);
1056         SSVAL(hdr, SMB2_HDR_LENGTH,             SMB2_HDR_BODY);
1057         SSVAL(hdr, SMB2_HDR_EPOCH,              0);
1058         SIVAL(hdr, SMB2_HDR_STATUS,             0);
1059         SSVAL(hdr, SMB2_HDR_OPCODE,             SMB2_OP_BREAK);
1060         SSVAL(hdr, SMB2_HDR_CREDIT,             0);
1061         SIVAL(hdr, SMB2_HDR_FLAGS,              SMB2_HDR_FLAG_REDIRECT);
1062         SIVAL(hdr, SMB2_HDR_NEXT_COMMAND,       0);
1063         SBVAL(hdr, SMB2_HDR_MESSAGE_ID,         UINT64_MAX);
1064         SIVAL(hdr, SMB2_HDR_PID,                0);
1065         SIVAL(hdr, SMB2_HDR_TID,                0);
1066         SBVAL(hdr, SMB2_HDR_SESSION_ID,         0);
1067         memset(hdr+SMB2_HDR_SIGNATURE, 0, 16);
1068
1069         SSVAL(body, 0x00, 0x18);
1070
1071         SCVAL(body, 0x02, oplock_level);
1072         SCVAL(body, 0x03, 0);           /* reserved */
1073         SIVAL(body, 0x04, 0);           /* reserved */
1074         SBVAL(body, 0x08, file_id_persistent);
1075         SBVAL(body, 0x10, file_id_volatile);
1076
1077         subreq = tstream_writev_queue_send(state,
1078                                            sconn->smb2.event_ctx,
1079                                            sconn->smb2.stream,
1080                                            sconn->smb2.send_queue,
1081                                            &state->vector, 1);
1082         if (subreq == NULL) {
1083                 return NT_STATUS_NO_MEMORY;
1084         }
1085         tevent_req_set_callback(subreq,
1086                                 smbd_smb2_oplock_break_writev_done,
1087                                 state);
1088
1089         return NT_STATUS_OK;
1090 }
1091
1092 static void smbd_smb2_oplock_break_writev_done(struct tevent_req *subreq)
1093 {
1094         struct smbd_smb2_send_oplock_break_state *state =
1095                 tevent_req_callback_data(subreq,
1096                 struct smbd_smb2_send_oplock_break_state);
1097         struct smbd_server_connection *sconn = state->sconn;
1098         int ret;
1099         int sys_errno;
1100
1101         ret = tstream_writev_queue_recv(subreq, &sys_errno);
1102         TALLOC_FREE(subreq);
1103         if (ret == -1) {
1104                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
1105                 smbd_server_connection_terminate(sconn, nt_errstr(status));
1106                 return;
1107         }
1108
1109         TALLOC_FREE(state);
1110 }
1111
1112 struct smbd_smb2_request_read_state {
1113         size_t missing;
1114         bool asked_for_header;
1115         struct smbd_smb2_request *smb2_req;
1116 };
1117
1118 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
1119                                          void *private_data,
1120                                          TALLOC_CTX *mem_ctx,
1121                                          struct iovec **_vector,
1122                                          size_t *_count);
1123 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
1124
1125 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
1126                                         struct tevent_context *ev,
1127                                         struct smbd_server_connection *conn)
1128 {
1129         struct tevent_req *req;
1130         struct smbd_smb2_request_read_state *state;
1131         struct tevent_req *subreq;
1132
1133         req = tevent_req_create(mem_ctx, &state,
1134                                 struct smbd_smb2_request_read_state);
1135         if (req == NULL) {
1136                 return NULL;
1137         }
1138         state->missing = 0;
1139         state->asked_for_header = false;
1140
1141         state->smb2_req = smbd_smb2_request_allocate(state);
1142         if (tevent_req_nomem(state->smb2_req, req)) {
1143                 return tevent_req_post(req, ev);
1144         }
1145         state->smb2_req->conn = conn;
1146
1147         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
1148                                               conn->smb2.recv_queue,
1149                                               smbd_smb2_request_next_vector,
1150                                               state);
1151         if (tevent_req_nomem(subreq, req)) {
1152                 return tevent_req_post(req, ev);
1153         }
1154         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
1155
1156         return req;
1157 }
1158
1159 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
1160                                          void *private_data,
1161                                          TALLOC_CTX *mem_ctx,
1162                                          struct iovec **_vector,
1163                                          size_t *_count)
1164 {
1165         struct smbd_smb2_request_read_state *state =
1166                 talloc_get_type_abort(private_data,
1167                 struct smbd_smb2_request_read_state);
1168         struct smbd_smb2_request *req = state->smb2_req;
1169         struct iovec *vector;
1170         int idx = req->in.vector_count;
1171         size_t len = 0;
1172         uint8_t *buf = NULL;
1173
1174         if (req->in.vector_count == 0) {
1175                 /*
1176                  * first we need to get the NBT header
1177                  */
1178                 req->in.vector = talloc_array(req, struct iovec,
1179                                               req->in.vector_count + 1);
1180                 if (req->in.vector == NULL) {
1181                         return -1;
1182                 }
1183                 req->in.vector_count += 1;
1184
1185                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
1186                 req->in.vector[idx].iov_len     = 4;
1187
1188                 vector = talloc_array(mem_ctx, struct iovec, 1);
1189                 if (vector == NULL) {
1190                         return -1;
1191                 }
1192
1193                 vector[0] = req->in.vector[idx];
1194
1195                 *_vector = vector;
1196                 *_count = 1;
1197                 return 0;
1198         }
1199
1200         if (req->in.vector_count == 1) {
1201                 /*
1202                  * Now we analyze the NBT header
1203                  */
1204                 state->missing = smb2_len(req->in.vector[0].iov_base);
1205
1206                 if (state->missing == 0) {
1207                         /* if there're no remaining bytes, we're done */
1208                         *_vector = NULL;
1209                         *_count = 0;
1210                         return 0;
1211                 }
1212
1213                 req->in.vector = talloc_realloc(req, req->in.vector,
1214                                                 struct iovec,
1215                                                 req->in.vector_count + 1);
1216                 if (req->in.vector == NULL) {
1217                         return -1;
1218                 }
1219                 req->in.vector_count += 1;
1220
1221                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
1222                         /*
1223                          * it's a special NBT message,
1224                          * so get all remaining bytes
1225                          */
1226                         len = state->missing;
1227                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
1228                         /*
1229                          * it's an invalid message, just read what we can get
1230                          * and let the caller handle the error
1231                          */
1232                         len = state->missing;
1233                 } else {
1234                         /*
1235                          * We assume it's a SMB2 request,
1236                          * and we first get the header and the
1237                          * first 2 bytes (the struct size) of the body
1238                          */
1239                         len = SMB2_HDR_BODY + 2;
1240
1241                         state->asked_for_header = true;
1242                 }
1243
1244                 state->missing -= len;
1245
1246                 buf = talloc_array(req->in.vector, uint8_t, len);
1247                 if (buf == NULL) {
1248                         return -1;
1249                 }
1250
1251                 req->in.vector[idx].iov_base    = (void *)buf;
1252                 req->in.vector[idx].iov_len     = len;
1253
1254                 vector = talloc_array(mem_ctx, struct iovec, 1);
1255                 if (vector == NULL) {
1256                         return -1;
1257                 }
1258
1259                 vector[0] = req->in.vector[idx];
1260
1261                 *_vector = vector;
1262                 *_count = 1;
1263                 return 0;
1264         }
1265
1266         if (state->missing == 0) {
1267                 /* if there're no remaining bytes, we're done */
1268                 *_vector = NULL;
1269                 *_count = 0;
1270                 return 0;
1271         }
1272
1273         if (state->asked_for_header) {
1274                 const uint8_t *hdr;
1275                 size_t full_size;
1276                 size_t next_command_ofs;
1277                 size_t body_size;
1278                 uint8_t *body;
1279                 size_t dyn_size;
1280                 uint8_t *dyn;
1281                 bool invalid = false;
1282
1283                 state->asked_for_header = false;
1284
1285                 /*
1286                  * We got the SMB2 header and the first 2 bytes
1287                  * of the body. We fix the size to just the header
1288                  * and manually copy the 2 first bytes to the body section
1289                  */
1290                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
1291                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
1292
1293                 /* allocate vectors for body and dynamic areas */
1294                 req->in.vector = talloc_realloc(req, req->in.vector,
1295                                                 struct iovec,
1296                                                 req->in.vector_count + 2);
1297                 if (req->in.vector == NULL) {
1298                         return -1;
1299                 }
1300                 req->in.vector_count += 2;
1301
1302                 full_size = state->missing + SMB2_HDR_BODY + 2;
1303                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1304                 body_size = SVAL(hdr, SMB2_HDR_BODY);
1305
1306                 if (next_command_ofs != 0) {
1307                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1308                                 /*
1309                                  * this is invalid, just return a zero
1310                                  * body and let the caller deal with the error
1311                                  */
1312                                 invalid = true;
1313                         } else if (next_command_ofs > full_size) {
1314                                 /*
1315                                  * this is invalid, just return a zero
1316                                  * body and let the caller deal with the error
1317                                  */
1318                                 invalid = true;
1319                         } else {
1320                                 full_size = next_command_ofs;
1321                         }
1322                 }
1323
1324                 if (!invalid) {
1325                         if (body_size < 2) {
1326                                 /*
1327                                  * this is invalid, just return a zero
1328                                  * body and let the caller deal with the error
1329                                  */
1330                                 invalid = true;
1331                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
1332                                 /*
1333                                  * this is invalid, just return a zero
1334                                  * body and let the caller deal with the error
1335                                  */
1336                                 invalid = true;
1337                         }
1338                 }
1339
1340                 if (invalid) {
1341                         /* the caller should check this */
1342                         body_size = 0;
1343                 }
1344
1345                 if ((body_size % 2) != 0) {
1346                         body_size -= 1;
1347                 }
1348
1349                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1350
1351                 state->missing -= (body_size - 2) + dyn_size;
1352
1353                 body = talloc_array(req->in.vector, uint8_t, body_size);
1354                 if (body == NULL) {
1355                         return -1;
1356                 }
1357
1358                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1359                 if (dyn == NULL) {
1360                         return -1;
1361                 }
1362
1363                 req->in.vector[idx].iov_base    = (void *)body;
1364                 req->in.vector[idx].iov_len     = body_size;
1365                 req->in.vector[idx+1].iov_base  = (void *)dyn;
1366                 req->in.vector[idx+1].iov_len   = dyn_size;
1367
1368                 vector = talloc_array(mem_ctx, struct iovec, 2);
1369                 if (vector == NULL) {
1370                         return -1;
1371                 }
1372
1373                 /*
1374                  * the first 2 bytes of the body were already fetched
1375                  * together with the header
1376                  */
1377                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1378                 vector[0].iov_base = body + 2;
1379                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
1380
1381                 vector[1] = req->in.vector[idx+1];
1382
1383                 *_vector = vector;
1384                 *_count = 2;
1385                 return 0;
1386         }
1387
1388         /*
1389          * when we endup here, we're looking for a new SMB2 request
1390          * next. And we ask for its header and the first 2 bytes of
1391          * the body (like we did for the first SMB2 request).
1392          */
1393
1394         req->in.vector = talloc_realloc(req, req->in.vector,
1395                                         struct iovec,
1396                                         req->in.vector_count + 1);
1397         if (req->in.vector == NULL) {
1398                 return -1;
1399         }
1400         req->in.vector_count += 1;
1401
1402         /*
1403          * We assume it's a SMB2 request,
1404          * and we first get the header and the
1405          * first 2 bytes (the struct size) of the body
1406          */
1407         len = SMB2_HDR_BODY + 2;
1408
1409         if (len > state->missing) {
1410                 /* let the caller handle the error */
1411                 len = state->missing;
1412         }
1413
1414         state->missing -= len;
1415         state->asked_for_header = true;
1416
1417         buf = talloc_array(req->in.vector, uint8_t, len);
1418         if (buf == NULL) {
1419                 return -1;
1420         }
1421
1422         req->in.vector[idx].iov_base    = (void *)buf;
1423         req->in.vector[idx].iov_len     = len;
1424
1425         vector = talloc_array(mem_ctx, struct iovec, 1);
1426         if (vector == NULL) {
1427                 return -1;
1428         }
1429
1430         vector[0] = req->in.vector[idx];
1431
1432         *_vector = vector;
1433         *_count = 1;
1434         return 0;
1435 }
1436
1437 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1438 {
1439         struct tevent_req *req =
1440                 tevent_req_callback_data(subreq,
1441                 struct tevent_req);
1442         int ret;
1443         int sys_errno;
1444         NTSTATUS status;
1445
1446         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1447         if (ret == -1) {
1448                 status = map_nt_error_from_unix(sys_errno);
1449                 tevent_req_nterror(req, status);
1450                 return;
1451         }
1452
1453         tevent_req_done(req);
1454 }
1455
1456 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1457                                             TALLOC_CTX *mem_ctx,
1458                                             struct smbd_smb2_request **_smb2_req)
1459 {
1460         struct smbd_smb2_request_read_state *state =
1461                 tevent_req_data(req,
1462                 struct smbd_smb2_request_read_state);
1463         NTSTATUS status;
1464
1465         if (tevent_req_is_nterror(req, &status)) {
1466                 tevent_req_received(req);
1467                 return status;
1468         }
1469
1470         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1471         *_smb2_req = state->smb2_req;
1472         tevent_req_received(req);
1473         return NT_STATUS_OK;
1474 }
1475
1476 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1477
1478 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1479                              const uint8_t *inbuf, size_t size)
1480 {
1481         NTSTATUS status;
1482         struct smbd_smb2_request *req;
1483         struct tevent_req *subreq;
1484
1485         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1486                  (unsigned int)size));
1487
1488         status = smbd_initialize_smb2(conn);
1489         if (!NT_STATUS_IS_OK(status)) {
1490                 smbd_server_connection_terminate(conn, nt_errstr(status));
1491                 return;
1492         }
1493
1494         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1495         if (!NT_STATUS_IS_OK(status)) {
1496                 smbd_server_connection_terminate(conn, nt_errstr(status));
1497                 return;
1498         }
1499
1500         status = smbd_smb2_request_setup_out(req);
1501         if (!NT_STATUS_IS_OK(status)) {
1502                 smbd_server_connection_terminate(conn, nt_errstr(status));
1503                 return;
1504         }
1505
1506         status = smbd_smb2_request_dispatch(req);
1507         if (!NT_STATUS_IS_OK(status)) {
1508                 smbd_server_connection_terminate(conn, nt_errstr(status));
1509                 return;
1510         }
1511
1512         /* ask for the next request */
1513         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1514         if (subreq == NULL) {
1515                 smbd_server_connection_terminate(conn, "no memory for reading");
1516                 return;
1517         }
1518         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1519 }
1520
1521 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1522 {
1523         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1524                                               struct smbd_server_connection);
1525         NTSTATUS status;
1526         struct smbd_smb2_request *req;
1527
1528         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1529         TALLOC_FREE(subreq);
1530         if (!NT_STATUS_IS_OK(status)) {
1531                 smbd_server_connection_terminate(conn, nt_errstr(status));
1532                 return;
1533         }
1534
1535         if (req->in.nbt_hdr[0] != 0x00) {
1536                 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1537                          req->in.nbt_hdr[0]));
1538                 TALLOC_FREE(req);
1539                 goto next;
1540         }
1541
1542         req->current_idx = 1;
1543
1544         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1545                  req->current_idx, req->in.vector_count));
1546
1547         status = smbd_smb2_request_validate(req);
1548         if (!NT_STATUS_IS_OK(status)) {
1549                 smbd_server_connection_terminate(conn, nt_errstr(status));
1550                 return;
1551         }
1552
1553         status = smbd_smb2_request_setup_out(req);
1554         if (!NT_STATUS_IS_OK(status)) {
1555                 smbd_server_connection_terminate(conn, nt_errstr(status));
1556                 return;
1557         }
1558
1559         status = smbd_smb2_request_dispatch(req);
1560         if (!NT_STATUS_IS_OK(status)) {
1561                 smbd_server_connection_terminate(conn, nt_errstr(status));
1562                 return;
1563         }
1564
1565 next:
1566         /* ask for the next request (this constructs the main loop) */
1567         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1568         if (subreq == NULL) {
1569                 smbd_server_connection_terminate(conn, "no memory for reading");
1570                 return;
1571         }
1572         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1573 }