source3/smbd/smb2_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23 #include "../source4/libcli/smb2/smb2_constants.h"
  24 #include "../lib/tsocket/tsocket.h"
  25
  26 bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
  27 {
  28         if (size < (4 + SMB2_HDR_BODY)) {
  29                 return false;
  30         }
  31
  32         if (IVAL(inbuf, 4) != SMB2_MAGIC) {
  33                 return false;
  34         }
  35
  36         return true;
  37 }
  38
  39 static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
  40 {
  41         NTSTATUS status;
  42         int ret;
  43
  44         TALLOC_FREE(conn->smb1.fde);
  45
  46         conn->smb2.event_ctx = smbd_event_context();
  47
  48         conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
  49         if (conn->smb2.recv_queue == NULL) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
  54         if (conn->smb2.send_queue == NULL) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         conn->smb2.sessions.idtree = idr_init(conn);
  59         if (conn->smb2.sessions.idtree == NULL) {
  60                 return NT_STATUS_NO_MEMORY;
  61         }
  62         conn->smb2.sessions.limit = 0x0000FFFE;
  63         conn->smb2.sessions.list = NULL;
  64
  65         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  66                                           &conn->smb2.stream);
  67         if (ret == -1) {
  68                 status = map_nt_error_from_unix(errno);
  69                 return status;
  70         }
  71
  72         /* Ensure child is set to non-blocking mode */
  73         set_blocking(smbd_server_fd(),false);
  74         return NT_STATUS_OK;
  75 }
  76
  77 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  78 #define _smb2_setlen(_buf,len) do { \
  79         uint8_t *buf = (uint8_t *)_buf; \
  80         buf[0] = 0; \
  81         buf[1] = ((len)&0xFF0000)>>16; \
  82         buf[2] = ((len)&0xFF00)>>8; \
  83         buf[3] = (len)&0xFF; \
  84 } while (0)
  85
  86 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  87 {
  88         size_t len = 0;
  89         int i;
  90
  91         for (i=1; i < count; i++) {
  92                 len += vector[i].iov_len;
  93         }
  94
  95         _smb2_setlen(vector[0].iov_base, len);
  96 }
  97
  98 static 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                 /* Make up a number for now... JRA. FIXME ! FIXME !*/
 249                 SSVAL(outhdr, SMB2_HDR_CREDIT,          20);
 250                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 251                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 252                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 253                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 254                 SIVAL(outhdr, SMB2_HDR_PID,
 255                       IVAL(inhdr, SMB2_HDR_PID));
 256                 SIVAL(outhdr, SMB2_HDR_TID,
 257                       IVAL(inhdr, SMB2_HDR_TID));
 258                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 259                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 260                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 261
 262                 /* setup error body header */
 263                 SSVAL(outbody, 0x00, 9);
 264                 SSVAL(outbody, 0x02, 0);
 265                 SIVAL(outbody, 0x04, 0);
 266
 267                 /* setup the dynamic part */
 268                 SCVAL(outdyn, 0x00, 0);
 269         }
 270
 271         req->out.vector = vector;
 272         req->out.vector_count = count;
 273
 274         /* setup the length of the NBT packet */
 275         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 276
 277         return NT_STATUS_OK;
 278 }
 279
 280 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
 281                                          const char *reason,
 282                                          const char *location)
 283 {
 284         DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
 285                   reason, location));
 286         exit_server_cleanly(reason);
 287 }
 288
 289 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 290 {
 291         const uint8_t *inhdr;
 292         int i = req->current_idx;
 293         uint16_t opcode;
 294         uint32_t flags;
 295         NTSTATUS status;
 296         NTSTATUS session_status;
 297
 298         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 299
 300         /* TODO: verify more things */
 301
 302         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 303         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 304         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 305
 306 #define TMP_SMB2_ALLOWED_FLAGS ( \
 307         SMB2_HDR_FLAG_CHAINED | \
 308         SMB2_HDR_FLAG_SIGNED | \
 309         SMB2_HDR_FLAG_DFS)
 310         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 311                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 312         }
 313 #undef TMP_SMB2_ALLOWED_FLAGS
 314
 315         session_status = smbd_smb2_request_check_session(req);
 316
 317         req->do_signing = false;
 318         if (flags & SMB2_HDR_FLAG_SIGNED) {
 319                 if (!NT_STATUS_IS_OK(session_status)) {
 320                         return smbd_smb2_request_error(req, session_status);
 321                 }
 322
 323                 req->do_signing = true;
 324                 status = smb2_signing_check_pdu(req->session->session_key,
 325                                                 &req->in.vector[i], 3);
 326                 if (!NT_STATUS_IS_OK(status)) {
 327                         return smbd_smb2_request_error(req, status);
 328                 }
 329         } else if (req->session && req->session->do_signing) {
 330                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 331         }
 332
 333         switch (opcode) {
 334         case SMB2_OP_NEGPROT:
 335                 return smbd_smb2_request_process_negprot(req);
 336
 337         case SMB2_OP_SESSSETUP:
 338                 return smbd_smb2_request_process_sesssetup(req);
 339
 340         case SMB2_OP_LOGOFF:
 341                 if (!NT_STATUS_IS_OK(session_status)) {
 342                         return smbd_smb2_request_error(req, session_status);
 343                 }
 344                 return smbd_smb2_request_process_logoff(req);
 345
 346         case SMB2_OP_TCON:
 347                 if (!NT_STATUS_IS_OK(session_status)) {
 348                         return smbd_smb2_request_error(req, session_status);
 349                 }
 350                 status = smbd_smb2_request_check_session(req);
 351                 if (!NT_STATUS_IS_OK(status)) {
 352                         return smbd_smb2_request_error(req, status);
 353                 }
 354                 return smbd_smb2_request_process_tcon(req);
 355
 356         case SMB2_OP_TDIS:
 357                 if (!NT_STATUS_IS_OK(session_status)) {
 358                         return smbd_smb2_request_error(req, session_status);
 359                 }
 360                 status = smbd_smb2_request_check_tcon(req);
 361                 if (!NT_STATUS_IS_OK(status)) {
 362                         return smbd_smb2_request_error(req, status);
 363                 }
 364                 return smbd_smb2_request_process_tdis(req);
 365
 366         case SMB2_OP_CREATE:
 367                 if (!NT_STATUS_IS_OK(session_status)) {
 368                         return smbd_smb2_request_error(req, session_status);
 369                 }
 370                 status = smbd_smb2_request_check_tcon(req);
 371                 if (!NT_STATUS_IS_OK(status)) {
 372                         return smbd_smb2_request_error(req, status);
 373                 }
 374                 return smbd_smb2_request_process_create(req);
 375
 376         case SMB2_OP_CLOSE:
 377                 if (!NT_STATUS_IS_OK(session_status)) {
 378                         return smbd_smb2_request_error(req, session_status);
 379                 }
 380                 status = smbd_smb2_request_check_tcon(req);
 381                 if (!NT_STATUS_IS_OK(status)) {
 382                         return smbd_smb2_request_error(req, status);
 383                 }
 384                 return smbd_smb2_request_process_close(req);
 385
 386         case SMB2_OP_FLUSH:
 387                 if (!NT_STATUS_IS_OK(session_status)) {
 388                         return smbd_smb2_request_error(req, session_status);
 389                 }
 390                 status = smbd_smb2_request_check_tcon(req);
 391                 if (!NT_STATUS_IS_OK(status)) {
 392                         return smbd_smb2_request_error(req, status);
 393                 }
 394                 return smbd_smb2_request_process_flush(req);
 395
 396         case SMB2_OP_READ:
 397                 if (!NT_STATUS_IS_OK(session_status)) {
 398                         return smbd_smb2_request_error(req, session_status);
 399                 }
 400                 status = smbd_smb2_request_check_tcon(req);
 401                 if (!NT_STATUS_IS_OK(status)) {
 402                         return smbd_smb2_request_error(req, status);
 403                 }
 404                 return smbd_smb2_request_process_read(req);
 405
 406         case SMB2_OP_WRITE:
 407                 if (!NT_STATUS_IS_OK(session_status)) {
 408                         return smbd_smb2_request_error(req, session_status);
 409                 }
 410                 status = smbd_smb2_request_check_tcon(req);
 411                 if (!NT_STATUS_IS_OK(status)) {
 412                         return smbd_smb2_request_error(req, status);
 413                 }
 414                 return smbd_smb2_request_process_write(req);
 415
 416         case SMB2_OP_LOCK:
 417                 if (!NT_STATUS_IS_OK(session_status)) {
 418                         return smbd_smb2_request_error(req, session_status);
 419                 }
 420                 status = smbd_smb2_request_check_tcon(req);
 421                 if (!NT_STATUS_IS_OK(status)) {
 422                         return smbd_smb2_request_error(req, status);
 423                 }
 424                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 425
 426         case SMB2_OP_IOCTL:
 427                 if (!NT_STATUS_IS_OK(session_status)) {
 428                         return smbd_smb2_request_error(req, session_status);
 429                 }
 430                 status = smbd_smb2_request_check_tcon(req);
 431                 if (!NT_STATUS_IS_OK(status)) {
 432                         return smbd_smb2_request_error(req, status);
 433                 }
 434                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 435
 436         case SMB2_OP_CANCEL:
 437                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 438
 439         case SMB2_OP_KEEPALIVE:
 440                 return smbd_smb2_request_process_keepalive(req);
 441
 442         case SMB2_OP_FIND:
 443                 if (!NT_STATUS_IS_OK(session_status)) {
 444                         return smbd_smb2_request_error(req, session_status);
 445                 }
 446                 status = smbd_smb2_request_check_tcon(req);
 447                 if (!NT_STATUS_IS_OK(status)) {
 448                         return smbd_smb2_request_error(req, status);
 449                 }
 450                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 451
 452         case SMB2_OP_NOTIFY:
 453                 if (!NT_STATUS_IS_OK(session_status)) {
 454                         return smbd_smb2_request_error(req, session_status);
 455                 }
 456                 status = smbd_smb2_request_check_tcon(req);
 457                 if (!NT_STATUS_IS_OK(status)) {
 458                         return smbd_smb2_request_error(req, status);
 459                 }
 460                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 461
 462         case SMB2_OP_GETINFO:
 463                 if (!NT_STATUS_IS_OK(session_status)) {
 464                         return smbd_smb2_request_error(req, session_status);
 465                 }
 466                 status = smbd_smb2_request_check_tcon(req);
 467                 if (!NT_STATUS_IS_OK(status)) {
 468                         return smbd_smb2_request_error(req, status);
 469                 }
 470                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 471
 472         case SMB2_OP_SETINFO:
 473                 if (!NT_STATUS_IS_OK(session_status)) {
 474                         return smbd_smb2_request_error(req, session_status);
 475                 }
 476                 status = smbd_smb2_request_check_tcon(req);
 477                 if (!NT_STATUS_IS_OK(status)) {
 478                         return smbd_smb2_request_error(req, status);
 479                 }
 480                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 481
 482         case SMB2_OP_BREAK:
 483                 if (!NT_STATUS_IS_OK(session_status)) {
 484                         return smbd_smb2_request_error(req, session_status);
 485                 }
 486                 status = smbd_smb2_request_check_tcon(req);
 487                 if (!NT_STATUS_IS_OK(status)) {
 488                         return smbd_smb2_request_error(req, status);
 489                 }
 490                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 491         }
 492
 493         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 494 }
 495
 496 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 497 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 498
 499 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 500 {
 501         struct tevent_req *subreq;
 502
 503         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 504
 505         if (req->do_signing) {
 506                 int i = req->current_idx;
 507                 NTSTATUS status;
 508                 status = smb2_signing_sign_pdu(req->session->session_key,
 509                                                &req->out.vector[i], 3);
 510                 if (!NT_STATUS_IS_OK(status)) {
 511                         return status;
 512                 }
 513         }
 514
 515         req->current_idx += 3;
 516
 517         if (req->current_idx > req->in.vector_count) {
 518                 struct timeval zero = timeval_zero();
 519                 subreq = tevent_wakeup_send(req,
 520                                             req->conn->smb2.event_ctx,
 521                                             zero);
 522                 if (subreq == NULL) {
 523                         return NT_STATUS_NO_MEMORY;
 524                 }
 525                 tevent_req_set_callback(subreq,
 526                                         smbd_smb2_request_dispatch_compound,
 527                                         req);
 528
 529                 return NT_STATUS_OK;
 530         }
 531
 532         subreq = tstream_writev_queue_send(req,
 533                                            req->conn->smb2.event_ctx,
 534                                            req->conn->smb2.stream,
 535                                            req->conn->smb2.send_queue,
 536                                            req->out.vector,
 537                                            req->out.vector_count);
 538         if (subreq == NULL) {
 539                 return NT_STATUS_NO_MEMORY;
 540         }
 541         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 542
 543         return NT_STATUS_OK;
 544 }
 545
 546 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 547 {
 548         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 549                                         struct smbd_smb2_request);
 550         struct smbd_server_connection *conn = req->conn;
 551         NTSTATUS status;
 552
 553         tevent_wakeup_recv(subreq);
 554         TALLOC_FREE(subreq);
 555
 556         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 557                   req->current_idx, req->in.vector_count));
 558
 559         status = smbd_smb2_request_dispatch(req);
 560         if (!NT_STATUS_IS_OK(status)) {
 561                 smbd_server_connection_terminate(conn, nt_errstr(status));
 562                 return;
 563         }
 564 }
 565
 566 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 567 {
 568         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 569                                         struct smbd_smb2_request);
 570         struct smbd_server_connection *conn = req->conn;
 571         int ret;
 572         int sys_errno;
 573         TALLOC_CTX *mem_pool;
 574
 575         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 576         TALLOC_FREE(subreq);
 577         if (ret == -1) {
 578                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 579                 smbd_server_connection_terminate(conn, nt_errstr(status));
 580                 return;
 581         }
 582
 583         mem_pool = req->mem_pool;
 584         req = NULL;
 585         talloc_free(mem_pool);
 586 }
 587
 588 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 589                                     NTSTATUS status,
 590                                     DATA_BLOB *info,
 591                                     const char *location)
 592 {
 593         uint8_t *outhdr;
 594         uint8_t *outbody;
 595         int i = req->current_idx;
 596
 597         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 598                   i, nt_errstr(status), info ? " +info" : "",
 599                   location));
 600
 601         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 602
 603         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 604
 605         outbody = outhdr + SMB2_HDR_BODY;
 606
 607         req->out.vector[i+1].iov_base = (void *)outbody;
 608         req->out.vector[i+1].iov_len = 8;
 609
 610         if (info) {
 611                 SIVAL(outbody, 0x04, info->length);
 612                 req->out.vector[i+2].iov_base   = (void *)info->data;
 613                 req->out.vector[i+2].iov_len    = info->length;
 614         } else {
 615                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 616                 req->out.vector[i+2].iov_len = 1;
 617         }
 618
 619         /* the error packet is the last response in the chain */
 620         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 621         req->out.vector_count = req->current_idx + 3;
 622
 623         return smbd_smb2_request_reply(req);
 624 }
 625
 626 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 627                                    NTSTATUS status,
 628                                    DATA_BLOB body, DATA_BLOB *dyn,
 629                                    const char *location)
 630 {
 631         uint8_t *outhdr;
 632         uint8_t *outdyn;
 633         int i = req->current_idx;
 634         uint32_t next_command_ofs;
 635
 636         DEBUG(10,("smbd_smb2_request_done_ex: "
 637                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 638                   i, nt_errstr(status), (unsigned int)body.length,
 639                   dyn ? "yes": "no",
 640                   (unsigned int)(dyn ? dyn->length : 0),
 641                   location));
 642
 643         if (body.length < 2) {
 644                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 645         }
 646
 647         if ((body.length % 2) != 0) {
 648                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 649         }
 650
 651         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 652         /* the fallback dynamic buffer */
 653         outdyn = outhdr + SMB2_HDR_BODY + 8;
 654
 655         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 656         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 657
 658         req->out.vector[i+1].iov_base = (void *)body.data;
 659         req->out.vector[i+1].iov_len = body.length;
 660
 661         if (dyn) {
 662                 if (dyn->length > 0) {
 663                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 664                         req->out.vector[i+2].iov_len    = dyn->length;
 665                 } else {
 666                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 667                         req->out.vector[i+2].iov_len    = 1;
 668                 }
 669         } else {
 670                 req->out.vector[i+2].iov_base = NULL;
 671                 req->out.vector[i+2].iov_len = 0;
 672         }
 673
 674         /* see if we need to recalculate the offset to the next response */
 675         if (next_command_ofs > 0) {
 676                 next_command_ofs  = SMB2_HDR_BODY;
 677                 next_command_ofs += req->out.vector[i+1].iov_len;
 678                 next_command_ofs += req->out.vector[i+2].iov_len;
 679         }
 680
 681         /* TODO: we need to add padding ... */
 682         if ((next_command_ofs % 8) != 0) {
 683                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 684         }
 685
 686         /* the error packet is the last response in the chain */
 687         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 688
 689         return smbd_smb2_request_reply(req);
 690 }
 691
 692 struct smbd_smb2_request_read_state {
 693         size_t missing;
 694         bool asked_for_header;
 695         struct smbd_smb2_request *smb2_req;
 696 };
 697
 698 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 699                                          void *private_data,
 700                                          TALLOC_CTX *mem_ctx,
 701                                          struct iovec **_vector,
 702                                          size_t *_count);
 703 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 704
 705 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 706                                         struct tevent_context *ev,
 707                                         struct smbd_server_connection *conn)
 708 {
 709         struct tevent_req *req;
 710         struct smbd_smb2_request_read_state *state;
 711         struct tevent_req *subreq;
 712         TALLOC_CTX *mem_pool;
 713
 714         req = tevent_req_create(mem_ctx, &state,
 715                                 struct smbd_smb2_request_read_state);
 716         if (req == NULL) {
 717                 return NULL;
 718         }
 719         state->missing = 0;
 720         state->asked_for_header = false;
 721
 722         mem_pool = talloc_pool(state, 8192);
 723         if (tevent_req_nomem(mem_pool, req)) {
 724                 return tevent_req_post(req, ev);
 725         }
 726
 727         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 728         if (tevent_req_nomem(state->smb2_req, req)) {
 729                 return tevent_req_post(req, ev);
 730         }
 731
 732         state->smb2_req->mem_pool       = mem_pool;
 733         state->smb2_req->conn           = conn;
 734
 735         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 736                                               conn->smb2.recv_queue,
 737                                               smbd_smb2_request_next_vector,
 738                                               state);
 739         if (tevent_req_nomem(subreq, req)) {
 740                 return tevent_req_post(req, ev);
 741         }
 742         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 743
 744         return req;
 745 }
 746
 747 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 748                                          void *private_data,
 749                                          TALLOC_CTX *mem_ctx,
 750                                          struct iovec **_vector,
 751                                          size_t *_count)
 752 {
 753         struct smbd_smb2_request_read_state *state =
 754                 talloc_get_type_abort(private_data,
 755                 struct smbd_smb2_request_read_state);
 756         struct smbd_smb2_request *req = state->smb2_req;
 757         struct iovec *vector;
 758         int idx = req->in.vector_count;
 759         size_t len = 0;
 760         uint8_t *buf = NULL;
 761
 762         if (req->in.vector_count == 0) {
 763                 /*
 764                  * first we need to get the NBT header
 765                  */
 766                 req->in.vector = talloc_array(req, struct iovec,
 767                                               req->in.vector_count + 1);
 768                 if (req->in.vector == NULL) {
 769                         return -1;
 770                 }
 771                 req->in.vector_count += 1;
 772
 773                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 774                 req->in.vector[idx].iov_len     = 4;
 775
 776                 vector = talloc_array(mem_ctx, struct iovec, 1);
 777                 if (vector == NULL) {
 778                         return -1;
 779                 }
 780
 781                 vector[0] = req->in.vector[idx];
 782
 783                 *_vector = vector;
 784                 *_count = 1;
 785                 return 0;
 786         }
 787
 788         if (req->in.vector_count == 1) {
 789                 /*
 790                  * Now we analyze the NBT header
 791                  */
 792                 state->missing = smb2_len(req->in.vector[0].iov_base);
 793
 794                 if (state->missing == 0) {
 795                         /* if there're no remaining bytes, we're done */
 796                         *_vector = NULL;
 797                         *_count = 0;
 798                         return 0;
 799                 }
 800
 801                 req->in.vector = talloc_realloc(req, req->in.vector,
 802                                                 struct iovec,
 803                                                 req->in.vector_count + 1);
 804                 if (req->in.vector == NULL) {
 805                         return -1;
 806                 }
 807                 req->in.vector_count += 1;
 808
 809                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 810                         /*
 811                          * it's a special NBT message,
 812                          * so get all remaining bytes
 813                          */
 814                         len = state->missing;
 815                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 816                         /*
 817                          * it's an invalid message, just read what we can get
 818                          * and let the caller handle the error
 819                          */
 820                         len = state->missing;
 821                 } else {
 822                         /*
 823                          * We assume it's a SMB2 request,
 824                          * and we first get the header and the
 825                          * first 2 bytes (the struct size) of the body
 826                          */
 827                         len = SMB2_HDR_BODY + 2;
 828
 829                         state->asked_for_header = true;
 830                 }
 831
 832                 state->missing -= len;
 833
 834                 buf = talloc_array(req->in.vector, uint8_t, len);
 835                 if (buf == NULL) {
 836                         return -1;
 837                 }
 838
 839                 req->in.vector[idx].iov_base    = (void *)buf;
 840                 req->in.vector[idx].iov_len     = len;
 841
 842                 vector = talloc_array(mem_ctx, struct iovec, 1);
 843                 if (vector == NULL) {
 844                         return -1;
 845                 }
 846
 847                 vector[0] = req->in.vector[idx];
 848
 849                 *_vector = vector;
 850                 *_count = 1;
 851                 return 0;
 852         }
 853
 854         if (state->missing == 0) {
 855                 /* if there're no remaining bytes, we're done */
 856                 *_vector = NULL;
 857                 *_count = 0;
 858                 return 0;
 859         }
 860
 861         if (state->asked_for_header) {
 862                 const uint8_t *hdr;
 863                 size_t full_size;
 864                 size_t next_command_ofs;
 865                 size_t body_size;
 866                 uint8_t *body;
 867                 size_t dyn_size;
 868                 uint8_t *dyn;
 869                 bool invalid = false;
 870
 871                 state->asked_for_header = false;
 872
 873                 /*
 874                  * We got the SMB2 header and the first 2 bytes
 875                  * of the body. We fix the size to just the header
 876                  * and manually copy the 2 first bytes to the body section
 877                  */
 878                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 879                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 880
 881                 /* allocate vectors for body and dynamic areas */
 882                 req->in.vector = talloc_realloc(req, req->in.vector,
 883                                                 struct iovec,
 884                                                 req->in.vector_count + 2);
 885                 if (req->in.vector == NULL) {
 886                         return -1;
 887                 }
 888                 req->in.vector_count += 2;
 889
 890                 full_size = state->missing + SMB2_HDR_BODY + 2;
 891                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 892                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 893
 894                 if (next_command_ofs != 0) {
 895                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 896                                 /*
 897                                  * this is invalid, just return a zero
 898                                  * body and let the caller deal with the error
 899                                  */
 900                                 invalid = true;
 901                         } else if (next_command_ofs > full_size) {
 902                                 /*
 903                                  * this is invalid, just return a zero
 904                                  * body and let the caller deal with the error
 905                                  */
 906                                 invalid = true;
 907                         } else {
 908                                 full_size = next_command_ofs;
 909                         }
 910                 }
 911
 912                 if (!invalid) {
 913                         if (body_size < 2) {
 914                                 /*
 915                                  * this is invalid, just return a zero
 916                                  * body and let the caller deal with the error
 917                                  */
 918                                 invalid = true;
 919                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 920                                 /*
 921                                  * this is invalid, just return a zero
 922                                  * body and let the caller deal with the error
 923                                  */
 924                                 invalid = true;
 925                         }
 926                 }
 927
 928                 if (invalid) {
 929                         /* the caller should check this */
 930                         body_size = 0;
 931                 }
 932
 933                 if ((body_size % 2) != 0) {
 934                         body_size -= 1;
 935                 }
 936
 937                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 938
 939                 state->missing -= (body_size - 2) + dyn_size;
 940
 941                 body = talloc_array(req->in.vector, uint8_t, body_size);
 942                 if (body == NULL) {
 943                         return -1;
 944                 }
 945
 946                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 947                 if (dyn == NULL) {
 948                         return -1;
 949                 }
 950
 951                 req->in.vector[idx].iov_base    = (void *)body;
 952                 req->in.vector[idx].iov_len     = body_size;
 953                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 954                 req->in.vector[idx+1].iov_len   = dyn_size;
 955
 956                 vector = talloc_array(mem_ctx, struct iovec, 2);
 957                 if (vector == NULL) {
 958                         return -1;
 959                 }
 960
 961                 /*
 962                  * the first 2 bytes of the body were already fetched
 963                  * together with the header
 964                  */
 965                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 966                 vector[0].iov_base = body + 2;
 967                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 968
 969                 vector[1] = req->in.vector[idx+1];
 970
 971                 *_vector = vector;
 972                 *_count = 2;
 973                 return 0;
 974         }
 975
 976         /*
 977          * when we endup here, we're looking for a new SMB2 request
 978          * next. And we ask for its header and the first 2 bytes of
 979          * the body (like we did for the first SMB2 request).
 980          */
 981
 982         req->in.vector = talloc_realloc(req, req->in.vector,
 983                                         struct iovec,
 984                                         req->in.vector_count + 1);
 985         if (req->in.vector == NULL) {
 986                 return -1;
 987         }
 988         req->in.vector_count += 1;
 989
 990         /*
 991          * We assume it's a SMB2 request,
 992          * and we first get the header and the
 993          * first 2 bytes (the struct size) of the body
 994          */
 995         len = SMB2_HDR_BODY + 2;
 996
 997         if (len > state->missing) {
 998                 /* let the caller handle the error */
 999                 len = state->missing;
1000         }
1001
1002         state->missing -= len;
1003         state->asked_for_header = true;
1004
1005         buf = talloc_array(req->in.vector, uint8_t, len);
1006         if (buf == NULL) {
1007                 return -1;
1008         }
1009
1010         req->in.vector[idx].iov_base    = (void *)buf;
1011         req->in.vector[idx].iov_len     = len;
1012
1013         vector = talloc_array(mem_ctx, struct iovec, 1);
1014         if (vector == NULL) {
1015                 return -1;
1016         }
1017
1018         vector[0] = req->in.vector[idx];
1019
1020         *_vector = vector;
1021         *_count = 1;
1022         return 0;
1023 }
1024
1025 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1026 {
1027         struct tevent_req *req =
1028                 tevent_req_callback_data(subreq,
1029                 struct tevent_req);
1030         int ret;
1031         int sys_errno;
1032         NTSTATUS status;
1033
1034         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1035         if (ret == -1) {
1036                 status = map_nt_error_from_unix(sys_errno);
1037                 tevent_req_nterror(req, status);
1038                 return;
1039         }
1040
1041         tevent_req_done(req);
1042 }
1043
1044 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1045                                             TALLOC_CTX *mem_ctx,
1046                                             struct smbd_smb2_request **_smb2_req)
1047 {
1048         struct smbd_smb2_request_read_state *state =
1049                 tevent_req_data(req,
1050                 struct smbd_smb2_request_read_state);
1051         NTSTATUS status;
1052
1053         if (tevent_req_is_nterror(req, &status)) {
1054                 tevent_req_received(req);
1055                 return status;
1056         }
1057
1058         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1059         *_smb2_req = state->smb2_req;
1060         tevent_req_received(req);
1061         return NT_STATUS_OK;
1062 }
1063
1064 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1065
1066 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1067                              const uint8_t *inbuf, size_t size)
1068 {
1069         NTSTATUS status;
1070         struct smbd_smb2_request *req;
1071         struct tevent_req *subreq;
1072
1073         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1074                  (unsigned int)size));
1075
1076         status = smbd_initialize_smb2(conn);
1077         if (!NT_STATUS_IS_OK(status)) {
1078                 smbd_server_connection_terminate(conn, nt_errstr(status));
1079                 return;
1080         }
1081
1082         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1083         if (!NT_STATUS_IS_OK(status)) {
1084                 smbd_server_connection_terminate(conn, nt_errstr(status));
1085                 return;
1086         }
1087
1088         status = smbd_smb2_request_setup_out(req);
1089         if (!NT_STATUS_IS_OK(status)) {
1090                 smbd_server_connection_terminate(conn, nt_errstr(status));
1091                 return;
1092         }
1093
1094         status = smbd_smb2_request_dispatch(req);
1095         if (!NT_STATUS_IS_OK(status)) {
1096                 smbd_server_connection_terminate(conn, nt_errstr(status));
1097                 return;
1098         }
1099
1100         /* ask for the next request */
1101         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1102         if (subreq == NULL) {
1103                 smbd_server_connection_terminate(conn, "no memory for reading");
1104                 return;
1105         }
1106         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1107 }
1108
1109 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1110 {
1111         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1112                                               struct smbd_server_connection);
1113         NTSTATUS status;
1114         struct smbd_smb2_request *req;
1115
1116         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1117         TALLOC_FREE(subreq);
1118         if (!NT_STATUS_IS_OK(status)) {
1119                 smbd_server_connection_terminate(conn, nt_errstr(status));
1120                 return;
1121         }
1122
1123         /* TODO: validate the incoming request */
1124         req->current_idx = 1;
1125
1126         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1127                  req->current_idx, req->in.vector_count));
1128
1129         status = smbd_smb2_request_setup_out(req);
1130         if (!NT_STATUS_IS_OK(status)) {
1131                 smbd_server_connection_terminate(conn, nt_errstr(status));
1132                 return;
1133         }
1134
1135         status = smbd_smb2_request_dispatch(req);
1136         if (!NT_STATUS_IS_OK(status)) {
1137                 smbd_server_connection_terminate(conn, nt_errstr(status));
1138                 return;
1139         }
1140
1141         /* ask for the next request (this constructs the main loop) */
1142         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1143         if (subreq == NULL) {
1144                 smbd_server_connection_terminate(conn, "no memory for reading");
1145                 return;
1146         }
1147         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1148 }