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         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 = 0x0000FFFF;
  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 NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
  99                                          const uint8_t *inbuf, size_t size,
 100                                          struct smbd_smb2_request **_req)
 101 {
 102         TALLOC_CTX *mem_pool;
 103         struct smbd_smb2_request *req;
 104         uint32_t protocol_version;
 105         const uint8_t *inhdr = NULL;
 106         off_t ofs = 0;
 107         uint16_t cmd;
 108         uint32_t next_command_ofs;
 109
 110         if (size < (4 + SMB2_HDR_BODY + 2)) {
 111                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 112                 return NT_STATUS_INVALID_PARAMETER;
 113         }
 114
 115         inhdr = inbuf + 4;
 116
 117         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 118         if (protocol_version != SMB2_MAGIC) {
 119                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 120                          protocol_version));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 125         if (cmd != SMB2_OP_NEGPROT) {
 126                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 127                          cmd));
 128                 return NT_STATUS_INVALID_PARAMETER;
 129         }
 130
 131         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 132         if (next_command_ofs != 0) {
 133                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 134                          next_command_ofs));
 135                 return NT_STATUS_INVALID_PARAMETER;
 136         }
 137
 138         mem_pool = talloc_pool(conn, 8192);
 139         if (mem_pool == NULL) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         req = talloc_zero(mem_pool, struct smbd_smb2_request);
 144         if (req == NULL) {
 145                 talloc_free(mem_pool);
 146                 return NT_STATUS_NO_MEMORY;
 147         }
 148         req->mem_pool   = mem_pool;
 149         req->conn       = conn;
 150
 151         talloc_steal(req, inbuf);
 152
 153         req->in.vector = talloc_array(req, struct iovec, 4);
 154         if (req->in.vector == NULL) {
 155                 talloc_free(mem_pool);
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158         req->in.vector_count = 4;
 159
 160         memcpy(req->in.nbt_hdr, inbuf, 4);
 161
 162         ofs = 0;
 163         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 164         req->in.vector[0].iov_len       = 4;
 165         ofs += req->in.vector[0].iov_len;
 166
 167         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 168         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 169         ofs += req->in.vector[1].iov_len;
 170
 171         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 172         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 173         ofs += req->in.vector[2].iov_len;
 174
 175         if (ofs > size) {
 176                 return NT_STATUS_INVALID_PARAMETER;
 177         }
 178
 179         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 180         req->in.vector[3].iov_len       = size - ofs;
 181         ofs += req->in.vector[3].iov_len;
 182
 183         req->current_idx = 1;
 184
 185         *_req = req;
 186         return NT_STATUS_OK;
 187 }
 188
 189 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 190 {
 191         struct iovec *vector;
 192         int count;
 193         int idx;
 194
 195         count = req->in.vector_count;
 196         vector = talloc_array(req, struct iovec, count);
 197         if (vector == NULL) {
 198                 return NT_STATUS_NO_MEMORY;
 199         }
 200
 201         vector[0].iov_base      = req->out.nbt_hdr;
 202         vector[0].iov_len       = 4;
 203         SIVAL(req->out.nbt_hdr, 0, 0);
 204
 205         for (idx=1; idx < count; idx += 3) {
 206                 const uint8_t *inhdr = NULL;
 207                 uint8_t *outhdr = NULL;
 208                 uint8_t *outbody = NULL;
 209                 uint8_t *outdyn = NULL;
 210                 size_t outdyn_size = 1;
 211                 uint32_t next_command_ofs = 0;
 212                 struct iovec *current = &vector[idx];
 213
 214                 if ((idx + 3) < count) {
 215                         /* we have a next command */
 216                         next_command_ofs = SMB2_HDR_BODY + 8 + 8;
 217                         outdyn_size = 8;
 218                 }
 219
 220                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 221
 222                 outhdr = talloc_array(vector, uint8_t,
 223                                       SMB2_HDR_BODY + 8 + outdyn_size);
 224                 if (outhdr == NULL) {
 225                         return NT_STATUS_NO_MEMORY;
 226                 }
 227
 228                 outbody = outhdr + SMB2_HDR_BODY;
 229                 outdyn = outbody + 8;
 230
 231                 current[0].iov_base     = (void *)outhdr;
 232                 current[0].iov_len      = SMB2_HDR_BODY;
 233
 234                 current[1].iov_base     = (void *)outbody;
 235                 current[1].iov_len      = 8;
 236
 237                 current[2].iov_base     = (void *)outdyn;
 238                 current[2].iov_len      = outdyn_size;
 239
 240                 /* setup the SMB2 header */
 241                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 242                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 243                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 244                 SIVAL(outhdr, SMB2_HDR_STATUS,
 245                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 246                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 247                       SVAL(inhdr, SMB2_HDR_OPCODE));
 248                 SSVAL(outhdr, SMB2_HDR_CREDIT,          0);
 249                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 250                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 251                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 252                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 253                 SIVAL(outhdr, SMB2_HDR_PID,
 254                       IVAL(inhdr, SMB2_HDR_PID));
 255                 SIVAL(outhdr, SMB2_HDR_TID,
 256                       IVAL(inhdr, SMB2_HDR_TID));
 257                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 258                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 259                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 260
 261                 /* setup error body header */
 262                 SSVAL(outbody, 0x00, 9);
 263                 SSVAL(outbody, 0x02, 0);
 264                 SIVAL(outbody, 0x04, 0);
 265
 266                 /* setup the dynamic part */
 267                 SCVAL(outdyn, 0x00, 0);
 268         }
 269
 270         req->out.vector = vector;
 271         req->out.vector_count = count;
 272
 273         /* setup the length of the NBT packet */
 274         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279 static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
 280                                              const char *reason)
 281 {
 282         DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
 283         exit_server_cleanly(reason);
 284 }
 285
 286 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 287 {
 288         const uint8_t *inhdr;
 289         int i = req->current_idx;
 290         uint16_t opcode;
 291
 292         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 293
 294         /* TODO: verify more things */
 295
 296         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 297         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 298         switch (opcode) {
 299         case SMB2_OP_NEGPROT:
 300                 return smbd_smb2_request_process_negprot(req);
 301
 302         case SMB2_OP_SESSSETUP:
 303                 return smbd_smb2_request_process_sesssetup(req);
 304
 305         case SMB2_OP_LOGOFF:
 306                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 307
 308                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 309         case SMB2_OP_TCON:
 310                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 311
 312                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 313         case SMB2_OP_TDIS:
 314                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 315
 316         case SMB2_OP_CREATE:
 317                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 318
 319         case SMB2_OP_CLOSE:
 320                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 321
 322         case SMB2_OP_FLUSH:
 323                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 324
 325         case SMB2_OP_READ:
 326                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 327
 328         case SMB2_OP_WRITE:
 329                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 330
 331         case SMB2_OP_LOCK:
 332                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 333
 334         case SMB2_OP_IOCTL:
 335                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 336
 337         case SMB2_OP_CANCEL:
 338                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 339
 340         case SMB2_OP_KEEPALIVE:
 341                 return smbd_smb2_request_process_keepalive(req);
 342
 343         case SMB2_OP_FIND:
 344                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 345
 346         case SMB2_OP_NOTIFY:
 347                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 348
 349         case SMB2_OP_GETINFO:
 350                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 351
 352         case SMB2_OP_SETINFO:
 353                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 354
 355         case SMB2_OP_BREAK:
 356                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 357         }
 358
 359         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 360 }
 361
 362 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 363 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 364
 365 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 366 {
 367         struct tevent_req *subreq;
 368
 369         /* TODO: sign the response here */
 370
 371         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 372
 373         req->current_idx += 3;
 374
 375         if (req->current_idx > req->in.vector_count) {
 376                 struct timeval zero = timeval_zero();
 377                 subreq = tevent_wakeup_send(req,
 378                                             req->conn->smb2.event_ctx,
 379                                             zero);
 380                 if (subreq == NULL) {
 381                         return NT_STATUS_NO_MEMORY;
 382                 }
 383                 tevent_req_set_callback(subreq,
 384                                         smbd_smb2_request_dispatch_compound,
 385                                         req);
 386
 387                 return NT_STATUS_OK;
 388         }
 389
 390         subreq = tstream_writev_queue_send(req,
 391                                            req->conn->smb2.event_ctx,
 392                                            req->conn->smb2.stream,
 393                                            req->conn->smb2.send_queue,
 394                                            req->out.vector,
 395                                            req->out.vector_count);
 396         if (subreq == NULL) {
 397                 return NT_STATUS_NO_MEMORY;
 398         }
 399         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 400
 401         return NT_STATUS_OK;
 402 }
 403
 404 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 405 {
 406         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 407                                         struct smbd_smb2_request);
 408         struct smbd_server_connection *conn = req->conn;
 409         NTSTATUS status;
 410
 411         tevent_wakeup_recv(subreq);
 412         TALLOC_FREE(subreq);
 413
 414         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 415                   req->current_idx, req->in.vector_count));
 416
 417         status = smbd_smb2_request_dispatch(req);
 418         if (!NT_STATUS_IS_OK(status)) {
 419                 smbd_server_connection_terminate(conn, nt_errstr(status));
 420                 return;
 421         }
 422 }
 423
 424 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 425 {
 426         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 427                                         struct smbd_smb2_request);
 428         struct smbd_server_connection *conn = req->conn;
 429         int ret;
 430         int sys_errno;
 431         TALLOC_CTX *mem_pool;
 432
 433         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 434         TALLOC_FREE(subreq);
 435         if (ret == -1) {
 436                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 437                 smbd_server_connection_terminate(conn, nt_errstr(status));
 438                 return;
 439         }
 440
 441         mem_pool = req->mem_pool;
 442         req = NULL;
 443         talloc_free(mem_pool);
 444 }
 445
 446 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 447                                     NTSTATUS status,
 448                                     DATA_BLOB *info)
 449 {
 450         uint8_t *outhdr;
 451         uint8_t *outbody;
 452         int i = req->current_idx;
 453
 454         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
 455                   i, nt_errstr(status), info ? " +info" : ""));
 456
 457         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 458
 459         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 460
 461         outbody = outhdr + SMB2_HDR_BODY;
 462
 463         req->out.vector[i+1].iov_base = (void *)outbody;
 464         req->out.vector[i+1].iov_len = 8;
 465
 466         if (info) {
 467                 SIVAL(outbody, 0x04, info->length);
 468                 req->out.vector[i+2].iov_base   = (void *)info->data;
 469                 req->out.vector[i+2].iov_len    = info->length;
 470         } else {
 471                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 472                 req->out.vector[i+2].iov_len = 1;
 473         }
 474
 475         /* the error packet is the last response in the chain */
 476         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 477         req->out.vector_count = req->current_idx + 3;
 478
 479         return smbd_smb2_request_reply(req);
 480 }
 481
 482 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 483                                  NTSTATUS status)
 484 {
 485         return smbd_smb2_request_error_ex(req, status, NULL);
 486 }
 487
 488 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 489                                    NTSTATUS status,
 490                                    DATA_BLOB body, DATA_BLOB *dyn)
 491 {
 492         uint8_t *outhdr;
 493         uint8_t *outdyn;
 494         int i = req->current_idx;
 495         uint32_t next_command_ofs;
 496
 497         DEBUG(10,("smbd_smb2_request_done_ex: "
 498                   "idx[%d] status[%s] body[%u] dyn[%s:%u]\n",
 499                   i, nt_errstr(status), (unsigned int)body.length,
 500                   dyn ? "yes": "no",
 501                   (unsigned int)(dyn ? dyn->length : 0)));
 502
 503         if (body.length < 2) {
 504                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 505         }
 506
 507         if ((body.length % 2) != 0) {
 508                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 509         }
 510
 511         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 512         /* the fallback dynamic buffer */
 513         outdyn = outhdr + SMB2_HDR_BODY + 8;
 514
 515         next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 516         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 517
 518         req->out.vector[i+1].iov_base = (void *)body.data;
 519         req->out.vector[i+1].iov_len = body.length;
 520
 521         if (dyn) {
 522                 if (dyn->length > 0) {
 523                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 524                         req->out.vector[i+2].iov_len    = dyn->length;
 525                 } else {
 526                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 527                         req->out.vector[i+2].iov_len    = 1;
 528                 }
 529         } else {
 530                 req->out.vector[i+2].iov_base = NULL;
 531                 req->out.vector[i+2].iov_len = 0;
 532         }
 533
 534         /* see if we need to recalculate the offset to the next response */
 535         if (next_command_ofs > 0) {
 536                 next_command_ofs  = SMB2_HDR_BODY;
 537                 next_command_ofs += req->out.vector[i+1].iov_len;
 538                 next_command_ofs += req->out.vector[i+2].iov_len;
 539         }
 540
 541         /* TODO: we need to add padding ... */
 542         if ((next_command_ofs % 8) != 0) {
 543                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 544         }
 545
 546         /* the error packet is the last response in the chain */
 547         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 548
 549         return smbd_smb2_request_reply(req);
 550 }
 551
 552 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 553                                 DATA_BLOB body, DATA_BLOB *dyn)
 554 {
 555         return smbd_smb2_request_done_ex(req, NT_STATUS_OK, body, dyn);
 556 }
 557
 558 struct smbd_smb2_request_read_state {
 559         size_t missing;
 560         bool asked_for_header;
 561         struct smbd_smb2_request *smb2_req;
 562 };
 563
 564 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 565                                          void *private_data,
 566                                          TALLOC_CTX *mem_ctx,
 567                                          struct iovec **_vector,
 568                                          size_t *_count);
 569 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 570
 571 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 572                                         struct tevent_context *ev,
 573                                         struct smbd_server_connection *conn)
 574 {
 575         struct tevent_req *req;
 576         struct smbd_smb2_request_read_state *state;
 577         struct tevent_req *subreq;
 578         TALLOC_CTX *mem_pool;
 579
 580         req = tevent_req_create(mem_ctx, &state,
 581                                 struct smbd_smb2_request_read_state);
 582         if (req == NULL) {
 583                 return NULL;
 584         }
 585         state->missing = 0;
 586         state->asked_for_header = false;
 587
 588         mem_pool = talloc_pool(state, 8192);
 589         if (tevent_req_nomem(mem_pool, req)) {
 590                 return tevent_req_post(req, ev);
 591         }
 592
 593         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 594         if (tevent_req_nomem(state->smb2_req, req)) {
 595                 return tevent_req_post(req, ev);
 596         }
 597
 598         state->smb2_req->mem_pool       = mem_pool;
 599         state->smb2_req->conn           = conn;
 600
 601         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 602                                               conn->smb2.recv_queue,
 603                                               smbd_smb2_request_next_vector,
 604                                               state);
 605         if (tevent_req_nomem(subreq, req)) {
 606                 return tevent_req_post(req, ev);
 607         }
 608         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 609
 610         return req;
 611 }
 612
 613 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 614                                          void *private_data,
 615                                          TALLOC_CTX *mem_ctx,
 616                                          struct iovec **_vector,
 617                                          size_t *_count)
 618 {
 619         struct smbd_smb2_request_read_state *state =
 620                 talloc_get_type_abort(private_data,
 621                 struct smbd_smb2_request_read_state);
 622         struct smbd_smb2_request *req = state->smb2_req;
 623         struct iovec *vector;
 624         int idx = req->in.vector_count;
 625         size_t len = 0;
 626         uint8_t *buf = NULL;
 627
 628         if (req->in.vector_count == 0) {
 629                 /*
 630                  * first we need to get the NBT header
 631                  */
 632                 req->in.vector = talloc_array(req, struct iovec,
 633                                               req->in.vector_count + 1);
 634                 if (req->in.vector == NULL) {
 635                         return -1;
 636                 }
 637                 req->in.vector_count += 1;
 638
 639                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 640                 req->in.vector[idx].iov_len     = 4;
 641
 642                 vector = talloc_array(mem_ctx, struct iovec, 1);
 643                 if (vector == NULL) {
 644                         return -1;
 645                 }
 646
 647                 vector[0] = req->in.vector[idx];
 648
 649                 *_vector = vector;
 650                 *_count = 1;
 651                 return 0;
 652         }
 653
 654         if (req->in.vector_count == 1) {
 655                 /*
 656                  * Now we analyze the NBT header
 657                  */
 658                 state->missing = smb2_len(req->in.vector[0].iov_base);
 659
 660                 if (state->missing == 0) {
 661                         /* if there're no remaining bytes, we're done */
 662                         *_vector = NULL;
 663                         *_count = 0;
 664                         return 0;
 665                 }
 666
 667                 req->in.vector = talloc_realloc(req, req->in.vector,
 668                                                 struct iovec,
 669                                                 req->in.vector_count + 1);
 670                 if (req->in.vector == NULL) {
 671                         return -1;
 672                 }
 673                 req->in.vector_count += 1;
 674
 675                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 676                         /*
 677                          * it's a special NBT message,
 678                          * so get all remaining bytes
 679                          */
 680                         len = state->missing;
 681                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 682                         /*
 683                          * it's an invalid message, just read what we can get
 684                          * and let the caller handle the error
 685                          */
 686                         len = state->missing;
 687                 } else {
 688                         /*
 689                          * We assume it's a SMB2 request,
 690                          * and we first get the header and the
 691                          * first 2 bytes (the struct size) of the body
 692                          */
 693                         len = SMB2_HDR_BODY + 2;
 694
 695                         state->asked_for_header = true;
 696                 }
 697
 698                 state->missing -= len;
 699
 700                 buf = talloc_array(req->in.vector, uint8_t, len);
 701                 if (buf == NULL) {
 702                         return -1;
 703                 }
 704
 705                 req->in.vector[idx].iov_base    = (void *)buf;
 706                 req->in.vector[idx].iov_len     = len;
 707
 708                 vector = talloc_array(mem_ctx, struct iovec, 1);
 709                 if (vector == NULL) {
 710                         return -1;
 711                 }
 712
 713                 vector[0] = req->in.vector[idx];
 714
 715                 *_vector = vector;
 716                 *_count = 1;
 717                 return 0;
 718         }
 719
 720         if (state->missing == 0) {
 721                 /* if there're no remaining bytes, we're done */
 722                 *_vector = NULL;
 723                 *_count = 0;
 724                 return 0;
 725         }
 726
 727         if (state->asked_for_header) {
 728                 const uint8_t *hdr;
 729                 size_t full_size;
 730                 size_t next_command_ofs;
 731                 size_t body_size;
 732                 uint8_t *body;
 733                 size_t dyn_size;
 734                 uint8_t *dyn;
 735                 bool invalid = false;
 736
 737                 state->asked_for_header = false;
 738
 739                 /*
 740                  * We got the SMB2 header and the first 2 bytes
 741                  * of the body. We fix the size to just the header
 742                  * and manually copy the 2 first bytes to the body section
 743                  */
 744                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 745                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 746
 747                 /* allocate vectors for body and dynamic areas */
 748                 req->in.vector = talloc_realloc(req, req->in.vector,
 749                                                 struct iovec,
 750                                                 req->in.vector_count + 2);
 751                 if (req->in.vector == NULL) {
 752                         return -1;
 753                 }
 754                 req->in.vector_count += 2;
 755
 756                 full_size = state->missing + SMB2_HDR_BODY + 2;
 757                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 758                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 759
 760                 if (next_command_ofs != 0) {
 761                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 762                                 /*
 763                                  * this is invalid, just return a zero
 764                                  * body and let the caller deal with the error
 765                                  */
 766                                 invalid = true;
 767                         } else if (next_command_ofs > full_size) {
 768                                 /*
 769                                  * this is invalid, just return a zero
 770                                  * body and let the caller deal with the error
 771                                  */
 772                                 invalid = true;
 773                         } else {
 774                                 full_size = next_command_ofs;
 775                         }
 776                 }
 777
 778                 if (!invalid) {
 779                         if (body_size < 2) {
 780                                 /*
 781                                  * this is invalid, just return a zero
 782                                  * body and let the caller deal with the error
 783                                  */
 784                                 invalid = true;
 785                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 786                                 /*
 787                                  * this is invalid, just return a zero
 788                                  * body and let the caller deal with the error
 789                                  */
 790                                 invalid = true;
 791                         }
 792                 }
 793
 794                 if (invalid) {
 795                         /* the caller should check this */
 796                         body_size = 0;
 797                 }
 798
 799                 if ((body_size % 2) != 0) {
 800                         body_size -= 1;
 801                 }
 802
 803                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 804
 805                 state->missing -= (body_size - 2) + dyn_size;
 806
 807                 body = talloc_array(req->in.vector, uint8_t, body_size);
 808                 if (body == NULL) {
 809                         return -1;
 810                 }
 811
 812                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 813                 if (dyn == NULL) {
 814                         return -1;
 815                 }
 816
 817                 req->in.vector[idx].iov_base    = (void *)body;
 818                 req->in.vector[idx].iov_len     = body_size;
 819                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 820                 req->in.vector[idx+1].iov_len   = dyn_size;
 821
 822                 vector = talloc_array(mem_ctx, struct iovec, 2);
 823                 if (vector == NULL) {
 824                         return -1;
 825                 }
 826
 827                 /*
 828                  * the first 2 bytes of the body were already fetched
 829                  * together with the header
 830                  */
 831                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 832                 vector[0].iov_base = body + 2;
 833                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 834
 835                 vector[1] = req->in.vector[idx+1];
 836
 837                 *_vector = vector;
 838                 *_count = 2;
 839                 return 0;
 840         }
 841
 842         /*
 843          * when we endup here, we're looking for a new SMB2 request
 844          * next. And we ask for its header and the first 2 bytes of
 845          * the body (like we did for the first SMB2 request).
 846          */
 847
 848         req->in.vector = talloc_realloc(req, req->in.vector,
 849                                         struct iovec,
 850                                         req->in.vector_count + 1);
 851         if (req->in.vector == NULL) {
 852                 return -1;
 853         }
 854         req->in.vector_count += 1;
 855
 856         /*
 857          * We assume it's a SMB2 request,
 858          * and we first get the header and the
 859          * first 2 bytes (the struct size) of the body
 860          */
 861         len = SMB2_HDR_BODY + 2;
 862
 863         if (len > state->missing) {
 864                 /* let the caller handle the error */
 865                 len = state->missing;
 866         }
 867
 868         state->missing -= len;
 869         state->asked_for_header = true;
 870
 871         buf = talloc_array(req->in.vector, uint8_t, len);
 872         if (buf == NULL) {
 873                 return -1;
 874         }
 875
 876         req->in.vector[idx].iov_base    = (void *)buf;
 877         req->in.vector[idx].iov_len     = len;
 878
 879         vector = talloc_array(mem_ctx, struct iovec, 1);
 880         if (vector == NULL) {
 881                 return -1;
 882         }
 883
 884         vector[0] = req->in.vector[idx];
 885
 886         *_vector = vector;
 887         *_count = 1;
 888         return 0;
 889 }
 890
 891 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 892 {
 893         struct tevent_req *req =
 894                 tevent_req_callback_data(subreq,
 895                 struct tevent_req);
 896         int ret;
 897         int sys_errno;
 898         NTSTATUS status;
 899
 900         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
 901         if (ret == -1) {
 902                 status = map_nt_error_from_unix(sys_errno);
 903                 tevent_req_nterror(req, status);
 904                 return;
 905         }
 906
 907         tevent_req_done(req);
 908 }
 909
 910 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
 911                                             TALLOC_CTX *mem_ctx,
 912                                             struct smbd_smb2_request **_smb2_req)
 913 {
 914         struct smbd_smb2_request_read_state *state =
 915                 tevent_req_data(req,
 916                 struct smbd_smb2_request_read_state);
 917         NTSTATUS status;
 918
 919         if (tevent_req_is_nterror(req, &status)) {
 920                 tevent_req_received(req);
 921                 return status;
 922         }
 923
 924         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
 925         *_smb2_req = state->smb2_req;
 926         tevent_req_received(req);
 927         return NT_STATUS_OK;
 928 }
 929
 930 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
 931
 932 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
 933                              const uint8_t *inbuf, size_t size)
 934 {
 935         NTSTATUS status;
 936         struct smbd_smb2_request *req;
 937         struct tevent_req *subreq;
 938
 939         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
 940                  (unsigned int)size));
 941
 942         status = smbd_initialize_smb2(conn);
 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_create(conn, inbuf, size, &req);
 949         if (!NT_STATUS_IS_OK(status)) {
 950                 smbd_server_connection_terminate(conn, nt_errstr(status));
 951                 return;
 952         }
 953
 954         status = smbd_smb2_request_setup_out(req);
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 smbd_server_connection_terminate(conn, nt_errstr(status));
 957                 return;
 958         }
 959
 960         status = smbd_smb2_request_dispatch(req);
 961         if (!NT_STATUS_IS_OK(status)) {
 962                 smbd_server_connection_terminate(conn, nt_errstr(status));
 963                 return;
 964         }
 965
 966         /* ask for the next request */
 967         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
 968         if (subreq == NULL) {
 969                 smbd_server_connection_terminate(conn, "no memory for reading");
 970                 return;
 971         }
 972         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
 973 }
 974
 975 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
 976 {
 977         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
 978                                               struct smbd_server_connection);
 979         NTSTATUS status;
 980         struct smbd_smb2_request *req;
 981
 982         status = smbd_smb2_request_read_recv(subreq, conn, &req);
 983         TALLOC_FREE(subreq);
 984         if (!NT_STATUS_IS_OK(status)) {
 985                 smbd_server_connection_terminate(conn, nt_errstr(status));
 986                 return;
 987         }
 988
 989         /* TODO: validate the incoming request */
 990         req->current_idx = 1;
 991
 992         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
 993                  req->current_idx, req->in.vector_count));
 994
 995         status = smbd_smb2_request_setup_out(req);
 996         if (!NT_STATUS_IS_OK(status)) {
 997                 smbd_server_connection_terminate(conn, nt_errstr(status));
 998                 return;
 999         }
1000
1001         status = smbd_smb2_request_dispatch(req);
1002         if (!NT_STATUS_IS_OK(status)) {
1003                 smbd_server_connection_terminate(conn, nt_errstr(status));
1004                 return;
1005         }
1006
1007         /* ask for the next request (this constructs the main loop) */
1008         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1009         if (subreq == NULL) {
1010                 smbd_server_connection_terminate(conn, "no memory for reading");
1011                 return;
1012         }
1013         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1014 }