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         NTSTATUS status;
 292
 293         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 294
 295         /* TODO: verify more things */
 296
 297         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 298         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 299         switch (opcode) {
 300         case SMB2_OP_NEGPROT:
 301                 return smbd_smb2_request_process_negprot(req);
 302
 303         case SMB2_OP_SESSSETUP:
 304                 return smbd_smb2_request_process_sesssetup(req);
 305
 306         case SMB2_OP_LOGOFF:
 307                 status = smbd_smb2_request_check_session(req);
 308                 if (!NT_STATUS_IS_OK(status)) {
 309                         return smbd_smb2_request_error(req, status);
 310                 }
 311                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 312
 313         case SMB2_OP_TCON:
 314                 status = smbd_smb2_request_check_session(req);
 315                 if (!NT_STATUS_IS_OK(status)) {
 316                         return smbd_smb2_request_error(req, status);
 317                 }
 318                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 319
 320         case SMB2_OP_TDIS:
 321                 status = smbd_smb2_request_check_session(req);
 322                 if (!NT_STATUS_IS_OK(status)) {
 323                         return smbd_smb2_request_error(req, status);
 324                 }
 325                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 326
 327         case SMB2_OP_CREATE:
 328                 status = smbd_smb2_request_check_session(req);
 329                 if (!NT_STATUS_IS_OK(status)) {
 330                         return smbd_smb2_request_error(req, status);
 331                 }
 332                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 333
 334         case SMB2_OP_CLOSE:
 335                 status = smbd_smb2_request_check_session(req);
 336                 if (!NT_STATUS_IS_OK(status)) {
 337                         return smbd_smb2_request_error(req, status);
 338                 }
 339                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 340
 341         case SMB2_OP_FLUSH:
 342                 status = smbd_smb2_request_check_session(req);
 343                 if (!NT_STATUS_IS_OK(status)) {
 344                         return smbd_smb2_request_error(req, status);
 345                 }
 346                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 347
 348         case SMB2_OP_READ:
 349                 status = smbd_smb2_request_check_session(req);
 350                 if (!NT_STATUS_IS_OK(status)) {
 351                         return smbd_smb2_request_error(req, status);
 352                 }
 353                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 354
 355         case SMB2_OP_WRITE:
 356                 status = smbd_smb2_request_check_session(req);
 357                 if (!NT_STATUS_IS_OK(status)) {
 358                         return smbd_smb2_request_error(req, status);
 359                 }
 360                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 361
 362         case SMB2_OP_LOCK:
 363                 status = smbd_smb2_request_check_session(req);
 364                 if (!NT_STATUS_IS_OK(status)) {
 365                         return smbd_smb2_request_error(req, status);
 366                 }
 367                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 368
 369         case SMB2_OP_IOCTL:
 370                 status = smbd_smb2_request_check_session(req);
 371                 if (!NT_STATUS_IS_OK(status)) {
 372                         return smbd_smb2_request_error(req, status);
 373                 }
 374                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 375
 376         case SMB2_OP_CANCEL:
 377                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 378
 379         case SMB2_OP_KEEPALIVE:
 380                 return smbd_smb2_request_process_keepalive(req);
 381
 382         case SMB2_OP_FIND:
 383                 status = smbd_smb2_request_check_session(req);
 384                 if (!NT_STATUS_IS_OK(status)) {
 385                         return smbd_smb2_request_error(req, status);
 386                 }
 387                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 388
 389         case SMB2_OP_NOTIFY:
 390                 status = smbd_smb2_request_check_session(req);
 391                 if (!NT_STATUS_IS_OK(status)) {
 392                         return smbd_smb2_request_error(req, status);
 393                 }
 394                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 395
 396         case SMB2_OP_GETINFO:
 397                 status = smbd_smb2_request_check_session(req);
 398                 if (!NT_STATUS_IS_OK(status)) {
 399                         return smbd_smb2_request_error(req, status);
 400                 }
 401                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 402
 403         case SMB2_OP_SETINFO:
 404                 status = smbd_smb2_request_check_session(req);
 405                 if (!NT_STATUS_IS_OK(status)) {
 406                         return smbd_smb2_request_error(req, status);
 407                 }
 408                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 409
 410         case SMB2_OP_BREAK:
 411                 status = smbd_smb2_request_check_session(req);
 412                 if (!NT_STATUS_IS_OK(status)) {
 413                         return smbd_smb2_request_error(req, status);
 414                 }
 415                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 416         }
 417
 418         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 419 }
 420
 421 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 422 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 423
 424 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 425 {
 426         struct tevent_req *subreq;
 427
 428         /* TODO: sign the response here */
 429
 430         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 431
 432         req->current_idx += 3;
 433
 434         if (req->current_idx > req->in.vector_count) {
 435                 struct timeval zero = timeval_zero();
 436                 subreq = tevent_wakeup_send(req,
 437                                             req->conn->smb2.event_ctx,
 438                                             zero);
 439                 if (subreq == NULL) {
 440                         return NT_STATUS_NO_MEMORY;
 441                 }
 442                 tevent_req_set_callback(subreq,
 443                                         smbd_smb2_request_dispatch_compound,
 444                                         req);
 445
 446                 return NT_STATUS_OK;
 447         }
 448
 449         subreq = tstream_writev_queue_send(req,
 450                                            req->conn->smb2.event_ctx,
 451                                            req->conn->smb2.stream,
 452                                            req->conn->smb2.send_queue,
 453                                            req->out.vector,
 454                                            req->out.vector_count);
 455         if (subreq == NULL) {
 456                 return NT_STATUS_NO_MEMORY;
 457         }
 458         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 459
 460         return NT_STATUS_OK;
 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 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 506                                     NTSTATUS status,
 507                                     DATA_BLOB *info)
 508 {
 509         uint8_t *outhdr;
 510         uint8_t *outbody;
 511         int i = req->current_idx;
 512
 513         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
 514                   i, nt_errstr(status), info ? " +info" : ""));
 515
 516         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 517
 518         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 519
 520         outbody = outhdr + SMB2_HDR_BODY;
 521
 522         req->out.vector[i+1].iov_base = (void *)outbody;
 523         req->out.vector[i+1].iov_len = 8;
 524
 525         if (info) {
 526                 SIVAL(outbody, 0x04, info->length);
 527                 req->out.vector[i+2].iov_base   = (void *)info->data;
 528                 req->out.vector[i+2].iov_len    = info->length;
 529         } else {
 530                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 531                 req->out.vector[i+2].iov_len = 1;
 532         }
 533
 534         /* the error packet is the last response in the chain */
 535         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 536         req->out.vector_count = req->current_idx + 3;
 537
 538         return smbd_smb2_request_reply(req);
 539 }
 540
 541 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 542                                  NTSTATUS status)
 543 {
 544         return smbd_smb2_request_error_ex(req, status, NULL);
 545 }
 546
 547 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 548                                    NTSTATUS status,
 549                                    DATA_BLOB body, DATA_BLOB *dyn)
 550 {
 551         uint8_t *outhdr;
 552         uint8_t *outdyn;
 553         int i = req->current_idx;
 554         uint32_t next_command_ofs;
 555
 556         DEBUG(10,("smbd_smb2_request_done_ex: "
 557                   "idx[%d] status[%s] body[%u] dyn[%s:%u]\n",
 558                   i, nt_errstr(status), (unsigned int)body.length,
 559                   dyn ? "yes": "no",
 560                   (unsigned int)(dyn ? dyn->length : 0)));
 561
 562         if (body.length < 2) {
 563                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 564         }
 565
 566         if ((body.length % 2) != 0) {
 567                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 568         }
 569
 570         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 571         /* the fallback dynamic buffer */
 572         outdyn = outhdr + SMB2_HDR_BODY + 8;
 573
 574         next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 575         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 576
 577         req->out.vector[i+1].iov_base = (void *)body.data;
 578         req->out.vector[i+1].iov_len = body.length;
 579
 580         if (dyn) {
 581                 if (dyn->length > 0) {
 582                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 583                         req->out.vector[i+2].iov_len    = dyn->length;
 584                 } else {
 585                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 586                         req->out.vector[i+2].iov_len    = 1;
 587                 }
 588         } else {
 589                 req->out.vector[i+2].iov_base = NULL;
 590                 req->out.vector[i+2].iov_len = 0;
 591         }
 592
 593         /* see if we need to recalculate the offset to the next response */
 594         if (next_command_ofs > 0) {
 595                 next_command_ofs  = SMB2_HDR_BODY;
 596                 next_command_ofs += req->out.vector[i+1].iov_len;
 597                 next_command_ofs += req->out.vector[i+2].iov_len;
 598         }
 599
 600         /* TODO: we need to add padding ... */
 601         if ((next_command_ofs % 8) != 0) {
 602                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 603         }
 604
 605         /* the error packet is the last response in the chain */
 606         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 607
 608         return smbd_smb2_request_reply(req);
 609 }
 610
 611 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 612                                 DATA_BLOB body, DATA_BLOB *dyn)
 613 {
 614         return smbd_smb2_request_done_ex(req, NT_STATUS_OK, body, dyn);
 615 }
 616
 617 struct smbd_smb2_request_read_state {
 618         size_t missing;
 619         bool asked_for_header;
 620         struct smbd_smb2_request *smb2_req;
 621 };
 622
 623 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 624                                          void *private_data,
 625                                          TALLOC_CTX *mem_ctx,
 626                                          struct iovec **_vector,
 627                                          size_t *_count);
 628 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 629
 630 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 631                                         struct tevent_context *ev,
 632                                         struct smbd_server_connection *conn)
 633 {
 634         struct tevent_req *req;
 635         struct smbd_smb2_request_read_state *state;
 636         struct tevent_req *subreq;
 637         TALLOC_CTX *mem_pool;
 638
 639         req = tevent_req_create(mem_ctx, &state,
 640                                 struct smbd_smb2_request_read_state);
 641         if (req == NULL) {
 642                 return NULL;
 643         }
 644         state->missing = 0;
 645         state->asked_for_header = false;
 646
 647         mem_pool = talloc_pool(state, 8192);
 648         if (tevent_req_nomem(mem_pool, req)) {
 649                 return tevent_req_post(req, ev);
 650         }
 651
 652         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 653         if (tevent_req_nomem(state->smb2_req, req)) {
 654                 return tevent_req_post(req, ev);
 655         }
 656
 657         state->smb2_req->mem_pool       = mem_pool;
 658         state->smb2_req->conn           = conn;
 659
 660         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 661                                               conn->smb2.recv_queue,
 662                                               smbd_smb2_request_next_vector,
 663                                               state);
 664         if (tevent_req_nomem(subreq, req)) {
 665                 return tevent_req_post(req, ev);
 666         }
 667         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 668
 669         return req;
 670 }
 671
 672 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 673                                          void *private_data,
 674                                          TALLOC_CTX *mem_ctx,
 675                                          struct iovec **_vector,
 676                                          size_t *_count)
 677 {
 678         struct smbd_smb2_request_read_state *state =
 679                 talloc_get_type_abort(private_data,
 680                 struct smbd_smb2_request_read_state);
 681         struct smbd_smb2_request *req = state->smb2_req;
 682         struct iovec *vector;
 683         int idx = req->in.vector_count;
 684         size_t len = 0;
 685         uint8_t *buf = NULL;
 686
 687         if (req->in.vector_count == 0) {
 688                 /*
 689                  * first we need to get the NBT header
 690                  */
 691                 req->in.vector = talloc_array(req, struct iovec,
 692                                               req->in.vector_count + 1);
 693                 if (req->in.vector == NULL) {
 694                         return -1;
 695                 }
 696                 req->in.vector_count += 1;
 697
 698                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 699                 req->in.vector[idx].iov_len     = 4;
 700
 701                 vector = talloc_array(mem_ctx, struct iovec, 1);
 702                 if (vector == NULL) {
 703                         return -1;
 704                 }
 705
 706                 vector[0] = req->in.vector[idx];
 707
 708                 *_vector = vector;
 709                 *_count = 1;
 710                 return 0;
 711         }
 712
 713         if (req->in.vector_count == 1) {
 714                 /*
 715                  * Now we analyze the NBT header
 716                  */
 717                 state->missing = smb2_len(req->in.vector[0].iov_base);
 718
 719                 if (state->missing == 0) {
 720                         /* if there're no remaining bytes, we're done */
 721                         *_vector = NULL;
 722                         *_count = 0;
 723                         return 0;
 724                 }
 725
 726                 req->in.vector = talloc_realloc(req, req->in.vector,
 727                                                 struct iovec,
 728                                                 req->in.vector_count + 1);
 729                 if (req->in.vector == NULL) {
 730                         return -1;
 731                 }
 732                 req->in.vector_count += 1;
 733
 734                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 735                         /*
 736                          * it's a special NBT message,
 737                          * so get all remaining bytes
 738                          */
 739                         len = state->missing;
 740                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 741                         /*
 742                          * it's an invalid message, just read what we can get
 743                          * and let the caller handle the error
 744                          */
 745                         len = state->missing;
 746                 } else {
 747                         /*
 748                          * We assume it's a SMB2 request,
 749                          * and we first get the header and the
 750                          * first 2 bytes (the struct size) of the body
 751                          */
 752                         len = SMB2_HDR_BODY + 2;
 753
 754                         state->asked_for_header = true;
 755                 }
 756
 757                 state->missing -= len;
 758
 759                 buf = talloc_array(req->in.vector, uint8_t, len);
 760                 if (buf == NULL) {
 761                         return -1;
 762                 }
 763
 764                 req->in.vector[idx].iov_base    = (void *)buf;
 765                 req->in.vector[idx].iov_len     = len;
 766
 767                 vector = talloc_array(mem_ctx, struct iovec, 1);
 768                 if (vector == NULL) {
 769                         return -1;
 770                 }
 771
 772                 vector[0] = req->in.vector[idx];
 773
 774                 *_vector = vector;
 775                 *_count = 1;
 776                 return 0;
 777         }
 778
 779         if (state->missing == 0) {
 780                 /* if there're no remaining bytes, we're done */
 781                 *_vector = NULL;
 782                 *_count = 0;
 783                 return 0;
 784         }
 785
 786         if (state->asked_for_header) {
 787                 const uint8_t *hdr;
 788                 size_t full_size;
 789                 size_t next_command_ofs;
 790                 size_t body_size;
 791                 uint8_t *body;
 792                 size_t dyn_size;
 793                 uint8_t *dyn;
 794                 bool invalid = false;
 795
 796                 state->asked_for_header = false;
 797
 798                 /*
 799                  * We got the SMB2 header and the first 2 bytes
 800                  * of the body. We fix the size to just the header
 801                  * and manually copy the 2 first bytes to the body section
 802                  */
 803                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 804                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 805
 806                 /* allocate vectors for body and dynamic areas */
 807                 req->in.vector = talloc_realloc(req, req->in.vector,
 808                                                 struct iovec,
 809                                                 req->in.vector_count + 2);
 810                 if (req->in.vector == NULL) {
 811                         return -1;
 812                 }
 813                 req->in.vector_count += 2;
 814
 815                 full_size = state->missing + SMB2_HDR_BODY + 2;
 816                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 817                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 818
 819                 if (next_command_ofs != 0) {
 820                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 821                                 /*
 822                                  * this is invalid, just return a zero
 823                                  * body and let the caller deal with the error
 824                                  */
 825                                 invalid = true;
 826                         } else if (next_command_ofs > full_size) {
 827                                 /*
 828                                  * this is invalid, just return a zero
 829                                  * body and let the caller deal with the error
 830                                  */
 831                                 invalid = true;
 832                         } else {
 833                                 full_size = next_command_ofs;
 834                         }
 835                 }
 836
 837                 if (!invalid) {
 838                         if (body_size < 2) {
 839                                 /*
 840                                  * this is invalid, just return a zero
 841                                  * body and let the caller deal with the error
 842                                  */
 843                                 invalid = true;
 844                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 845                                 /*
 846                                  * this is invalid, just return a zero
 847                                  * body and let the caller deal with the error
 848                                  */
 849                                 invalid = true;
 850                         }
 851                 }
 852
 853                 if (invalid) {
 854                         /* the caller should check this */
 855                         body_size = 0;
 856                 }
 857
 858                 if ((body_size % 2) != 0) {
 859                         body_size -= 1;
 860                 }
 861
 862                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 863
 864                 state->missing -= (body_size - 2) + dyn_size;
 865
 866                 body = talloc_array(req->in.vector, uint8_t, body_size);
 867                 if (body == NULL) {
 868                         return -1;
 869                 }
 870
 871                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 872                 if (dyn == NULL) {
 873                         return -1;
 874                 }
 875
 876                 req->in.vector[idx].iov_base    = (void *)body;
 877                 req->in.vector[idx].iov_len     = body_size;
 878                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 879                 req->in.vector[idx+1].iov_len   = dyn_size;
 880
 881                 vector = talloc_array(mem_ctx, struct iovec, 2);
 882                 if (vector == NULL) {
 883                         return -1;
 884                 }
 885
 886                 /*
 887                  * the first 2 bytes of the body were already fetched
 888                  * together with the header
 889                  */
 890                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 891                 vector[0].iov_base = body + 2;
 892                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 893
 894                 vector[1] = req->in.vector[idx+1];
 895
 896                 *_vector = vector;
 897                 *_count = 2;
 898                 return 0;
 899         }
 900
 901         /*
 902          * when we endup here, we're looking for a new SMB2 request
 903          * next. And we ask for its header and the first 2 bytes of
 904          * the body (like we did for the first SMB2 request).
 905          */
 906
 907         req->in.vector = talloc_realloc(req, req->in.vector,
 908                                         struct iovec,
 909                                         req->in.vector_count + 1);
 910         if (req->in.vector == NULL) {
 911                 return -1;
 912         }
 913         req->in.vector_count += 1;
 914
 915         /*
 916          * We assume it's a SMB2 request,
 917          * and we first get the header and the
 918          * first 2 bytes (the struct size) of the body
 919          */
 920         len = SMB2_HDR_BODY + 2;
 921
 922         if (len > state->missing) {
 923                 /* let the caller handle the error */
 924                 len = state->missing;
 925         }
 926
 927         state->missing -= len;
 928         state->asked_for_header = true;
 929
 930         buf = talloc_array(req->in.vector, uint8_t, len);
 931         if (buf == NULL) {
 932                 return -1;
 933         }
 934
 935         req->in.vector[idx].iov_base    = (void *)buf;
 936         req->in.vector[idx].iov_len     = len;
 937
 938         vector = talloc_array(mem_ctx, struct iovec, 1);
 939         if (vector == NULL) {
 940                 return -1;
 941         }
 942
 943         vector[0] = req->in.vector[idx];
 944
 945         *_vector = vector;
 946         *_count = 1;
 947         return 0;
 948 }
 949
 950 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 951 {
 952         struct tevent_req *req =
 953                 tevent_req_callback_data(subreq,
 954                 struct tevent_req);
 955         int ret;
 956         int sys_errno;
 957         NTSTATUS status;
 958
 959         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
 960         if (ret == -1) {
 961                 status = map_nt_error_from_unix(sys_errno);
 962                 tevent_req_nterror(req, status);
 963                 return;
 964         }
 965
 966         tevent_req_done(req);
 967 }
 968
 969 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
 970                                             TALLOC_CTX *mem_ctx,
 971                                             struct smbd_smb2_request **_smb2_req)
 972 {
 973         struct smbd_smb2_request_read_state *state =
 974                 tevent_req_data(req,
 975                 struct smbd_smb2_request_read_state);
 976         NTSTATUS status;
 977
 978         if (tevent_req_is_nterror(req, &status)) {
 979                 tevent_req_received(req);
 980                 return status;
 981         }
 982
 983         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
 984         *_smb2_req = state->smb2_req;
 985         tevent_req_received(req);
 986         return NT_STATUS_OK;
 987 }
 988
 989 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
 990
 991 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
 992                              const uint8_t *inbuf, size_t size)
 993 {
 994         NTSTATUS status;
 995         struct smbd_smb2_request *req;
 996         struct tevent_req *subreq;
 997
 998         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
 999                  (unsigned int)size));
1000
1001         status = smbd_initialize_smb2(conn);
1002         if (!NT_STATUS_IS_OK(status)) {
1003                 smbd_server_connection_terminate(conn, nt_errstr(status));
1004                 return;
1005         }
1006
1007         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1008         if (!NT_STATUS_IS_OK(status)) {
1009                 smbd_server_connection_terminate(conn, nt_errstr(status));
1010                 return;
1011         }
1012
1013         status = smbd_smb2_request_setup_out(req);
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 smbd_server_connection_terminate(conn, nt_errstr(status));
1016                 return;
1017         }
1018
1019         status = smbd_smb2_request_dispatch(req);
1020         if (!NT_STATUS_IS_OK(status)) {
1021                 smbd_server_connection_terminate(conn, nt_errstr(status));
1022                 return;
1023         }
1024
1025         /* ask for the next request */
1026         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1027         if (subreq == NULL) {
1028                 smbd_server_connection_terminate(conn, "no memory for reading");
1029                 return;
1030         }
1031         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1032 }
1033
1034 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1035 {
1036         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1037                                               struct smbd_server_connection);
1038         NTSTATUS status;
1039         struct smbd_smb2_request *req;
1040
1041         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1042         TALLOC_FREE(subreq);
1043         if (!NT_STATUS_IS_OK(status)) {
1044                 smbd_server_connection_terminate(conn, nt_errstr(status));
1045                 return;
1046         }
1047
1048         /* TODO: validate the incoming request */
1049         req->current_idx = 1;
1050
1051         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1052                  req->current_idx, req->in.vector_count));
1053
1054         status = smbd_smb2_request_setup_out(req);
1055         if (!NT_STATUS_IS_OK(status)) {
1056                 smbd_server_connection_terminate(conn, nt_errstr(status));
1057                 return;
1058         }
1059
1060         status = smbd_smb2_request_dispatch(req);
1061         if (!NT_STATUS_IS_OK(status)) {
1062                 smbd_server_connection_terminate(conn, nt_errstr(status));
1063                 return;
1064         }
1065
1066         /* ask for the next request (this constructs the main loop) */
1067         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1068         if (subreq == NULL) {
1069                 smbd_server_connection_terminate(conn, "no memory for reading");
1070                 return;
1071         }
1072         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1073 }