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->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         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  59                                           &conn->smb2.stream);
  60         if (ret == -1) {
  61                 status = map_nt_error_from_unix(errno);
  62                 return status;
  63         }
  64
  65         /* Ensure child is set to non-blocking mode */
  66         set_blocking(smbd_server_fd(),false);
  67         return NT_STATUS_OK;
  68 }
  69
  70 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  71 #define _smb2_setlen(_buf,len) do { \
  72         uint8_t *buf = (uint8_t *)_buf; \
  73         buf[0] = 0; \
  74         buf[1] = ((len)&0xFF0000)>>16; \
  75         buf[2] = ((len)&0xFF00)>>8; \
  76         buf[3] = (len)&0xFF; \
  77 } while (0)
  78
  79 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  80 {
  81         size_t len = 0;
  82         int i;
  83
  84         for (i=1; i < count; i++) {
  85                 len += vector[i].iov_len;
  86         }
  87
  88         _smb2_setlen(vector[0].iov_base, len);
  89 }
  90
  91 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
  92                                          const uint8_t *inbuf, size_t size,
  93                                          struct smbd_smb2_request **_req)
  94 {
  95         TALLOC_CTX *mem_pool;
  96         struct smbd_smb2_request *req;
  97         uint32_t protocol_version;
  98         const uint8_t *inhdr = NULL;
  99         off_t ofs = 0;
 100         uint16_t cmd;
 101         uint32_t next_command_ofs;
 102
 103         if (size < (4 + SMB2_HDR_BODY + 2)) {
 104                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 105                 return NT_STATUS_INVALID_PARAMETER;
 106         }
 107
 108         inhdr = inbuf + 4;
 109
 110         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 111         if (protocol_version != SMB2_MAGIC) {
 112                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 113                          protocol_version));
 114                 return NT_STATUS_INVALID_PARAMETER;
 115         }
 116
 117         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 118         if (cmd != SMB2_OP_NEGPROT) {
 119                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 120                          cmd));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 125         if (next_command_ofs != 0) {
 126                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 127                          next_command_ofs));
 128                 return NT_STATUS_INVALID_PARAMETER;
 129         }
 130
 131         mem_pool = talloc_pool(conn, 8192);
 132         if (mem_pool == NULL) {
 133                 return NT_STATUS_NO_MEMORY;
 134         }
 135
 136         req = talloc_zero(mem_pool, struct smbd_smb2_request);
 137         if (req == NULL) {
 138                 talloc_free(mem_pool);
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141         req->mem_pool   = mem_pool;
 142         req->conn       = conn;
 143
 144         talloc_steal(req, inbuf);
 145
 146         req->in.vector = talloc_array(req, struct iovec, 4);
 147         if (req->in.vector == NULL) {
 148                 talloc_free(mem_pool);
 149                 return NT_STATUS_NO_MEMORY;
 150         }
 151         req->in.vector_count = 4;
 152
 153         memcpy(req->in.nbt_hdr, inbuf, 4);
 154
 155         ofs = 0;
 156         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 157         req->in.vector[0].iov_len       = 4;
 158         ofs += req->in.vector[0].iov_len;
 159
 160         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 161         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 162         ofs += req->in.vector[1].iov_len;
 163
 164         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 165         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 166         ofs += req->in.vector[2].iov_len;
 167
 168         if (ofs > size) {
 169                 return NT_STATUS_INVALID_PARAMETER;
 170         }
 171
 172         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 173         req->in.vector[3].iov_len       = size - ofs;
 174         ofs += req->in.vector[3].iov_len;
 175
 176         req->current_idx = 1;
 177
 178         *_req = req;
 179         return NT_STATUS_OK;
 180 }
 181
 182 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 183 {
 184         struct iovec *vector;
 185         int count;
 186         int idx;
 187
 188         count = req->in.vector_count;
 189         vector = talloc_array(req, struct iovec, count);
 190         if (vector == NULL) {
 191                 return NT_STATUS_NO_MEMORY;
 192         }
 193
 194         vector[0].iov_base      = req->out.nbt_hdr;
 195         vector[0].iov_len       = 4;
 196         SIVAL(req->out.nbt_hdr, 0, 0);
 197
 198         for (idx=1; idx < count; idx += 3) {
 199                 const uint8_t *inhdr = NULL;
 200                 uint8_t *outhdr = NULL;
 201                 uint8_t *outbody = NULL;
 202                 uint8_t *outdyn = NULL;
 203                 size_t outdyn_size = 1;
 204                 uint32_t next_command_ofs = 0;
 205                 struct iovec *current = &vector[idx];
 206
 207                 if ((idx + 3) < count) {
 208                         /* we have a next command */
 209                         next_command_ofs = SMB2_HDR_BODY + 8 + 8;
 210                         outdyn_size = 8;
 211                 }
 212
 213                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 214
 215                 outhdr = talloc_array(vector, uint8_t,
 216                                       SMB2_HDR_BODY + 8 + outdyn_size);
 217                 if (outhdr == NULL) {
 218                         return NT_STATUS_NO_MEMORY;
 219                 }
 220
 221                 outbody = outhdr + SMB2_HDR_BODY;
 222                 outdyn = outbody + 8;
 223
 224                 current[0].iov_base     = (void *)outhdr;
 225                 current[0].iov_len      = SMB2_HDR_BODY;
 226
 227                 current[1].iov_base     = (void *)outbody;
 228                 current[1].iov_len      = 8;
 229
 230                 current[2].iov_base     = (void *)outdyn;
 231                 current[2].iov_len      = outdyn_size;
 232
 233                 /* setup the SMB2 header */
 234                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 235                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 236                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 237                 SIVAL(outhdr, SMB2_HDR_STATUS,
 238                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 239                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 240                       SVAL(inhdr, SMB2_HDR_OPCODE));
 241                 SSVAL(outhdr, SMB2_HDR_CREDIT,          0);
 242                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 243                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 244                 SIVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 245                       IVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 246                 SIVAL(outhdr, SMB2_HDR_PID,
 247                       IVAL(inhdr, SMB2_HDR_PID));
 248                 SIVAL(outhdr, SMB2_HDR_TID,
 249                       IVAL(inhdr, SMB2_HDR_TID));
 250                 SIVAL(outhdr, SMB2_HDR_SESSION_ID,
 251                       IVAL(inhdr, SMB2_HDR_SESSION_ID));
 252                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 253
 254                 /* setup error body header */
 255                 SSVAL(outbody, 0x00, 9);
 256                 SSVAL(outbody, 0x02, 0);
 257                 SIVAL(outbody, 0x04, 0);
 258
 259                 /* setup the dynamic part */
 260                 SCVAL(outdyn, 0x00, 0);
 261         }
 262
 263         req->out.vector = vector;
 264         req->out.vector_count = count;
 265
 266         /* setup the length of the NBT packet */
 267         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 268
 269         return NT_STATUS_OK;
 270 }
 271
 272 static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
 273                                              const char *reason)
 274 {
 275         DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
 276         exit_server_cleanly(reason);
 277 }
 278
 279 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 280 {
 281         const uint8_t *inhdr;
 282         int i = req->current_idx;
 283         uint16_t opcode;
 284
 285         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 286
 287         /* TODO: verify more things */
 288
 289         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 290         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 291         switch (opcode) {
 292         case SMB2_OP_NEGPROT:
 293         case SMB2_OP_SESSSETUP:
 294         case SMB2_OP_LOGOFF:
 295         case SMB2_OP_TCON:
 296         case SMB2_OP_TDIS:
 297         case SMB2_OP_CREATE:
 298         case SMB2_OP_CLOSE:
 299         case SMB2_OP_FLUSH:
 300         case SMB2_OP_READ:
 301         case SMB2_OP_WRITE:
 302         case SMB2_OP_LOCK:
 303         case SMB2_OP_IOCTL:
 304         case SMB2_OP_CANCEL:
 305         case SMB2_OP_KEEPALIVE:
 306         case SMB2_OP_FIND:
 307         case SMB2_OP_NOTIFY:
 308         case SMB2_OP_GETINFO:
 309         case SMB2_OP_SETINFO:
 310         case SMB2_OP_BREAK:
 311                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 312         }
 313
 314         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 315 }
 316
 317 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 318 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 319
 320 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 321 {
 322         struct tevent_req *subreq;
 323
 324         /* TODO: sign the response here */
 325
 326         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 327
 328         req->current_idx += 3;
 329
 330         if (req->current_idx > req->in.vector_count) {
 331                 struct timeval zero = timeval_zero();
 332                 subreq = tevent_wakeup_send(req,
 333                                             req->conn->smb2.event_ctx,
 334                                             zero);
 335                 if (subreq == NULL) {
 336                         return NT_STATUS_NO_MEMORY;
 337                 }
 338                 tevent_req_set_callback(subreq,
 339                                         smbd_smb2_request_dispatch_compound,
 340                                         req);
 341
 342                 return NT_STATUS_OK;
 343         }
 344
 345         subreq = tstream_writev_queue_send(req,
 346                                            req->conn->smb2.event_ctx,
 347                                            req->conn->smb2.stream,
 348                                            req->conn->smb2.send_queue,
 349                                            req->out.vector,
 350                                            req->out.vector_count);
 351         if (subreq == NULL) {
 352                 return NT_STATUS_NO_MEMORY;
 353         }
 354         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 355
 356         return NT_STATUS_OK;
 357 }
 358
 359 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 360                                     NTSTATUS status,
 361                                     DATA_BLOB *info)
 362 {
 363         uint8_t *outhdr;
 364         uint8_t *outbody;
 365         int i = req->current_idx;
 366
 367         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
 368                   i, nt_errstr(status), info ? " +info" : ""));
 369
 370         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 371
 372         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 373
 374         outbody = outhdr + SMB2_HDR_BODY;
 375
 376         req->out.vector[i+1].iov_base = (void *)outbody;
 377         req->out.vector[i+1].iov_len = 8;
 378
 379         if (info) {
 380                 SIVAL(outbody, 0x04, info->length);
 381                 req->out.vector[i+2].iov_base   = (void *)info->data;
 382                 req->out.vector[i+2].iov_len    = info->length;
 383         } else {
 384                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 385                 req->out.vector[i+2].iov_len = 1;
 386         }
 387
 388         /* the error packet is the last response in the chain */
 389         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 390         req->out.vector_count = req->current_idx + 3;
 391
 392         return smbd_smb2_request_reply(req);
 393 }
 394
 395 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 396                                  NTSTATUS status)
 397 {
 398         return smbd_smb2_request_error_ex(req, status, NULL);
 399 }
 400
 401 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 402                                 DATA_BLOB body, DATA_BLOB *dyn)
 403 {
 404         uint8_t *outhdr;
 405         uint8_t *outdyn;
 406         int i = req->current_idx;
 407         uint32_t next_command_ofs;
 408
 409         DEBUG(10,("smbd_smb2_request_done: idx[%d] body[%u] dyn[%s:%u]\n",
 410                   i, (unsigned int)body.length,
 411                   dyn ? "yes": "no",
 412                   (unsigned int)(dyn ? dyn->length : 0)));
 413
 414         if (body.length < 2) {
 415                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 416         }
 417
 418         if ((body.length % 2) != 0) {
 419                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 420         }
 421
 422         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 423         /* the fallback dynamic buffer */
 424         outdyn = outhdr + SMB2_HDR_BODY + 8;
 425
 426         next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 427         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(NT_STATUS_OK));
 428
 429         req->out.vector[i+1].iov_base = (void *)body.data;
 430         req->out.vector[i+1].iov_len = body.length;
 431
 432         if (dyn) {
 433                 if (dyn->length > 0) {
 434                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 435                         req->out.vector[i+2].iov_len    = dyn->length;
 436                 } else {
 437                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 438                         req->out.vector[i+2].iov_len    = 1;
 439                 }
 440         } else {
 441                 req->out.vector[i+2].iov_base = NULL;
 442                 req->out.vector[i+2].iov_len = 0;
 443         }
 444
 445         /* see if we need to recalculate the offset to the next response */
 446         if (next_command_ofs > 0) {
 447                 next_command_ofs  = SMB2_HDR_BODY;
 448                 next_command_ofs += req->out.vector[i+1].iov_len;
 449                 next_command_ofs += req->out.vector[i+2].iov_len;
 450         }
 451
 452         /* TODO: we need to add padding ... */
 453         if ((next_command_ofs % 8) != 0) {
 454                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 455         }
 456
 457         /* the error packet is the last response in the chain */
 458         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 459
 460         return smbd_smb2_request_reply(req);
 461 }
 462
 463 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 464 {
 465         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 466                                         struct smbd_smb2_request);
 467         struct smbd_server_connection *conn = req->conn;
 468         NTSTATUS status;
 469
 470         tevent_wakeup_recv(subreq);
 471         TALLOC_FREE(subreq);
 472
 473         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 474                   req->current_idx, req->in.vector_count));
 475
 476         status = smbd_smb2_request_dispatch(req);
 477         if (!NT_STATUS_IS_OK(status)) {
 478                 smbd_server_connection_terminate(conn, nt_errstr(status));
 479                 return;
 480         }
 481 }
 482
 483 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 484 {
 485         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 486                                         struct smbd_smb2_request);
 487         struct smbd_server_connection *conn = req->conn;
 488         int ret;
 489         int sys_errno;
 490         TALLOC_CTX *mem_pool;
 491
 492         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 493         TALLOC_FREE(subreq);
 494         if (ret == -1) {
 495                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 496                 smbd_server_connection_terminate(conn, nt_errstr(status));
 497                 return;
 498         }
 499
 500         mem_pool = req->mem_pool;
 501         req = NULL;
 502         talloc_free(mem_pool);
 503 }
 504
 505 struct smbd_smb2_request_read_state {
 506         size_t missing;
 507         bool asked_for_header;
 508         struct smbd_smb2_request *smb2_req;
 509 };
 510
 511 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 512                                          void *private_data,
 513                                          TALLOC_CTX *mem_ctx,
 514                                          struct iovec **_vector,
 515                                          size_t *_count);
 516 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 517
 518 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 519                                         struct tevent_context *ev,
 520                                         struct smbd_server_connection *conn)
 521 {
 522         struct tevent_req *req;
 523         struct smbd_smb2_request_read_state *state;
 524         struct tevent_req *subreq;
 525         TALLOC_CTX *mem_pool;
 526
 527         req = tevent_req_create(mem_ctx, &state,
 528                                 struct smbd_smb2_request_read_state);
 529         if (req == NULL) {
 530                 return NULL;
 531         }
 532         state->missing = 0;
 533         state->asked_for_header = false;
 534
 535         mem_pool = talloc_pool(state, 8192);
 536         if (tevent_req_nomem(mem_pool, req)) {
 537                 return tevent_req_post(req, ev);
 538         }
 539
 540         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 541         if (tevent_req_nomem(state->smb2_req, req)) {
 542                 return tevent_req_post(req, ev);
 543         }
 544
 545         state->smb2_req->mem_pool       = mem_pool;
 546         state->smb2_req->conn           = conn;
 547
 548         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 549                                               conn->smb2.recv_queue,
 550                                               smbd_smb2_request_next_vector,
 551                                               state);
 552         if (tevent_req_nomem(subreq, req)) {
 553                 return tevent_req_post(req, ev);
 554         }
 555         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 556
 557         return req;
 558 }
 559
 560 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 561                                          void *private_data,
 562                                          TALLOC_CTX *mem_ctx,
 563                                          struct iovec **_vector,
 564                                          size_t *_count)
 565 {
 566         struct smbd_smb2_request_read_state *state =
 567                 talloc_get_type_abort(private_data,
 568                 struct smbd_smb2_request_read_state);
 569         struct smbd_smb2_request *req = state->smb2_req;
 570         struct iovec *vector;
 571         int idx = req->in.vector_count;
 572         size_t len = 0;
 573         uint8_t *buf = NULL;
 574
 575         if (req->in.vector_count == 0) {
 576                 /*
 577                  * first we need to get the NBT header
 578                  */
 579                 req->in.vector = talloc_array(req, struct iovec,
 580                                               req->in.vector_count + 1);
 581                 if (req->in.vector == NULL) {
 582                         return -1;
 583                 }
 584                 req->in.vector_count += 1;
 585
 586                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 587                 req->in.vector[idx].iov_len     = 4;
 588
 589                 vector = talloc_array(mem_ctx, struct iovec, 1);
 590                 if (vector == NULL) {
 591                         return -1;
 592                 }
 593
 594                 vector[0] = req->in.vector[idx];
 595
 596                 *_vector = vector;
 597                 *_count = 1;
 598                 return 0;
 599         }
 600
 601         if (req->in.vector_count == 1) {
 602                 /*
 603                  * Now we analyze the NBT header
 604                  */
 605                 state->missing = smb2_len(req->in.vector[0].iov_base);
 606
 607                 if (state->missing == 0) {
 608                         /* if there're no remaining bytes, we're done */
 609                         *_vector = NULL;
 610                         *_count = 0;
 611                         return 0;
 612                 }
 613
 614                 req->in.vector = talloc_realloc(req, req->in.vector,
 615                                                 struct iovec,
 616                                                 req->in.vector_count + 1);
 617                 if (req->in.vector == NULL) {
 618                         return -1;
 619                 }
 620                 req->in.vector_count += 1;
 621
 622                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 623                         /*
 624                          * it's a special NBT message,
 625                          * so get all remaining bytes
 626                          */
 627                         len = state->missing;
 628                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 629                         /*
 630                          * it's an invalid message, just read what we can get
 631                          * and let the caller handle the error
 632                          */
 633                         len = state->missing;
 634                 } else {
 635                         /*
 636                          * We assume it's a SMB2 request,
 637                          * and we first get the header and the
 638                          * first 2 bytes (the struct size) of the body
 639                          */
 640                         len = SMB2_HDR_BODY + 2;
 641
 642                         state->asked_for_header = true;
 643                 }
 644
 645                 state->missing -= len;
 646
 647                 buf = talloc_array(req->in.vector, uint8_t, len);
 648                 if (buf == NULL) {
 649                         return -1;
 650                 }
 651
 652                 req->in.vector[idx].iov_base    = (void *)buf;
 653                 req->in.vector[idx].iov_len     = len;
 654
 655                 vector = talloc_array(mem_ctx, struct iovec, 1);
 656                 if (vector == NULL) {
 657                         return -1;
 658                 }
 659
 660                 vector[0] = req->in.vector[idx];
 661
 662                 *_vector = vector;
 663                 *_count = 1;
 664                 return 0;
 665         }
 666
 667         if (state->missing == 0) {
 668                 /* if there're no remaining bytes, we're done */
 669                 *_vector = NULL;
 670                 *_count = 0;
 671                 return 0;
 672         }
 673
 674         if (state->asked_for_header) {
 675                 const uint8_t *hdr;
 676                 size_t full_size;
 677                 size_t next_command_ofs;
 678                 size_t body_size;
 679                 uint8_t *body;
 680                 size_t dyn_size;
 681                 uint8_t *dyn;
 682                 bool invalid = false;
 683
 684                 state->asked_for_header = false;
 685
 686                 /*
 687                  * We got the SMB2 header and the first 2 bytes
 688                  * of the body. We fix the size to just the header
 689                  * and manually copy the 2 first bytes to the body section
 690                  */
 691                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 692                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 693
 694                 /* allocate vectors for body and dynamic areas */
 695                 req->in.vector = talloc_realloc(req, req->in.vector,
 696                                                 struct iovec,
 697                                                 req->in.vector_count + 2);
 698                 if (req->in.vector == NULL) {
 699                         return -1;
 700                 }
 701                 req->in.vector_count += 2;
 702
 703                 full_size = state->missing + SMB2_HDR_BODY + 2;
 704                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 705                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 706
 707                 if (next_command_ofs != 0) {
 708                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 709                                 /*
 710                                  * this is invalid, just return a zero
 711                                  * body and let the caller deal with the error
 712                                  */
 713                                 invalid = true;
 714                         } else if (next_command_ofs > full_size) {
 715                                 /*
 716                                  * this is invalid, just return a zero
 717                                  * body and let the caller deal with the error
 718                                  */
 719                                 invalid = true;
 720                         } else {
 721                                 full_size = next_command_ofs;
 722                         }
 723                 }
 724
 725                 if (!invalid) {
 726                         if (body_size < 2) {
 727                                 /*
 728                                  * this is invalid, just return a zero
 729                                  * body and let the caller deal with the error
 730                                  */
 731                                 invalid = true;
 732                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 733                                 /*
 734                                  * this is invalid, just return a zero
 735                                  * body and let the caller deal with the error
 736                                  */
 737                                 invalid = true;
 738                         }
 739                 }
 740
 741                 if (invalid) {
 742                         /* the caller should check this */
 743                         body_size = 0;
 744                 }
 745
 746                 if ((body_size % 2) != 0) {
 747                         body_size -= 1;
 748                 }
 749
 750                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 751
 752                 state->missing -= (body_size - 2) + dyn_size;
 753
 754                 body = talloc_array(req->in.vector, uint8_t, body_size);
 755                 if (body == NULL) {
 756                         return -1;
 757                 }
 758
 759                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 760                 if (dyn == NULL) {
 761                         return -1;
 762                 }
 763
 764                 req->in.vector[idx].iov_base    = (void *)body;
 765                 req->in.vector[idx].iov_len     = body_size;
 766                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 767                 req->in.vector[idx+1].iov_len   = dyn_size;
 768
 769                 vector = talloc_array(mem_ctx, struct iovec, 2);
 770                 if (vector == NULL) {
 771                         return -1;
 772                 }
 773
 774                 /*
 775                  * the first 2 bytes of the body were already fetched
 776                  * together with the header
 777                  */
 778                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 779                 vector[0].iov_base = body + 2;
 780                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 781
 782                 vector[1] = req->in.vector[idx+1];
 783
 784                 *_vector = vector;
 785                 *_count = 2;
 786                 return 0;
 787         }
 788
 789         /*
 790          * when we endup here, we're looking for a new SMB2 request
 791          * next. And we ask for its header and the first 2 bytes of
 792          * the body (like we did for the first SMB2 request).
 793          */
 794
 795         req->in.vector = talloc_realloc(req, req->in.vector,
 796                                         struct iovec,
 797                                         req->in.vector_count + 1);
 798         if (req->in.vector == NULL) {
 799                 return -1;
 800         }
 801         req->in.vector_count += 1;
 802
 803         /*
 804          * We assume it's a SMB2 request,
 805          * and we first get the header and the
 806          * first 2 bytes (the struct size) of the body
 807          */
 808         len = SMB2_HDR_BODY + 2;
 809
 810         if (len > state->missing) {
 811                 /* let the caller handle the error */
 812                 len = state->missing;
 813         }
 814
 815         state->missing -= len;
 816         state->asked_for_header = true;
 817
 818         buf = talloc_array(req->in.vector, uint8_t, len);
 819         if (buf == NULL) {
 820                 return -1;
 821         }
 822
 823         req->in.vector[idx].iov_base    = (void *)buf;
 824         req->in.vector[idx].iov_len     = len;
 825
 826         vector = talloc_array(mem_ctx, struct iovec, 1);
 827         if (vector == NULL) {
 828                 return -1;
 829         }
 830
 831         vector[0] = req->in.vector[idx];
 832
 833         *_vector = vector;
 834         *_count = 1;
 835         return 0;
 836 }
 837
 838 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 839 {
 840         struct tevent_req *req =
 841                 tevent_req_callback_data(subreq,
 842                 struct tevent_req);
 843         int ret;
 844         int sys_errno;
 845         NTSTATUS status;
 846
 847         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
 848         if (ret == -1) {
 849                 status = map_nt_error_from_unix(sys_errno);
 850                 tevent_req_nterror(req, status);
 851                 return;
 852         }
 853
 854         tevent_req_done(req);
 855 }
 856
 857 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
 858                                             TALLOC_CTX *mem_ctx,
 859                                             struct smbd_smb2_request **_smb2_req)
 860 {
 861         struct smbd_smb2_request_read_state *state =
 862                 tevent_req_data(req,
 863                 struct smbd_smb2_request_read_state);
 864         NTSTATUS status;
 865
 866         if (tevent_req_is_nterror(req, &status)) {
 867                 tevent_req_received(req);
 868                 return status;
 869         }
 870
 871         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
 872         *_smb2_req = state->smb2_req;
 873         tevent_req_received(req);
 874         return NT_STATUS_OK;
 875 }
 876
 877 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
 878
 879 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
 880                              const uint8_t *inbuf, size_t size)
 881 {
 882         NTSTATUS status;
 883         struct smbd_smb2_request *req;
 884         struct tevent_req *subreq;
 885
 886         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
 887                  (unsigned int)size));
 888
 889         status = smbd_initialize_smb2(conn);
 890         if (!NT_STATUS_IS_OK(status)) {
 891                 smbd_server_connection_terminate(conn, nt_errstr(status));
 892                 return;
 893         }
 894
 895         status = smbd_smb2_request_create(conn, inbuf, size, &req);
 896         if (!NT_STATUS_IS_OK(status)) {
 897                 smbd_server_connection_terminate(conn, nt_errstr(status));
 898                 return;
 899         }
 900
 901         status = smbd_smb2_request_setup_out(req);
 902         if (!NT_STATUS_IS_OK(status)) {
 903                 smbd_server_connection_terminate(conn, nt_errstr(status));
 904                 return;
 905         }
 906
 907         status = smbd_smb2_request_dispatch(req);
 908         if (!NT_STATUS_IS_OK(status)) {
 909                 smbd_server_connection_terminate(conn, nt_errstr(status));
 910                 return;
 911         }
 912
 913         /* ask for the next request */
 914         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
 915         if (subreq == NULL) {
 916                 smbd_server_connection_terminate(conn, "no memory for reading");
 917                 return;
 918         }
 919         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
 920 }
 921
 922 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
 923 {
 924         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
 925                                               struct smbd_server_connection);
 926         NTSTATUS status;
 927         struct smbd_smb2_request *req;
 928
 929         status = smbd_smb2_request_read_recv(subreq, conn, &req);
 930         TALLOC_FREE(subreq);
 931         if (!NT_STATUS_IS_OK(status)) {
 932                 smbd_server_connection_terminate(conn, nt_errstr(status));
 933                 return;
 934         }
 935
 936         /* TODO: validate the incoming request */
 937         req->current_idx = 1;
 938
 939         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
 940                  req->current_idx, req->in.vector_count));
 941
 942         status = smbd_smb2_request_setup_out(req);
 943         if (!NT_STATUS_IS_OK(status)) {
 944                 smbd_server_connection_terminate(conn, nt_errstr(status));
 945                 return;
 946         }
 947
 948         status = smbd_smb2_request_dispatch(req);
 949         if (!NT_STATUS_IS_OK(status)) {
 950                 smbd_server_connection_terminate(conn, nt_errstr(status));
 951                 return;
 952         }
 953
 954         /* ask for the next request (this constructs the main loop) */
 955         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
 956         if (subreq == NULL) {
 957                 smbd_server_connection_terminate(conn, "no memory for reading");
 958                 return;
 959         }
 960         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
 961 }