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_validate(struct smbd_smb2_request *req)
 190 {
 191         int count;
 192         int idx;
 193         bool compound_related = false;
 194
 195         count = req->in.vector_count;
 196
 197         if (count < 4) {
 198                 /* It's not a SMB2 request */
 199                 return NT_STATUS_INVALID_PARAMETER;
 200         }
 201
 202         for (idx=1; idx < count; idx += 3) {
 203                 const uint8_t *inhdr = NULL;
 204                 uint32_t flags;
 205
 206                 if (req->in.vector[idx].iov_len != SMB2_HDR_BODY) {
 207                         return NT_STATUS_INVALID_PARAMETER;
 208                 }
 209
 210                 if (req->in.vector[idx+1].iov_len < 2) {
 211                         return NT_STATUS_INVALID_PARAMETER;
 212                 }
 213
 214                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 215
 216                 /* setup the SMB2 header */
 217                 if (IVAL(inhdr, SMB2_HDR_PROTOCOL_ID) != SMB2_MAGIC) {
 218                         return NT_STATUS_INVALID_PARAMETER;
 219                 }
 220
 221                 flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 222                 if (idx == 1) {
 223                         /*
 224                          * the 1st request should never have the
 225                          * SMB2_HDR_FLAG_CHAINED flag set
 226                          */
 227                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 228                                 req->next_status = NT_STATUS_INVALID_PARAMETER;
 229                                 return NT_STATUS_OK;
 230                         }
 231                 } else if (idx == 4) {
 232                         /*
 233                          * the 2nd request triggers related vs. unrelated
 234                          * compounded requests
 235                          */
 236                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 237                                 compound_related = true;
 238                         }
 239                 } else if (idx > 4) {
 240                         /*
 241                          * all other requests should match the 2nd one
 242                          */
 243                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 244                                 if (!compound_related) {
 245                                         req->next_status =
 246                                                 NT_STATUS_INVALID_PARAMETER;
 247                                         return NT_STATUS_OK;
 248                                 }
 249                         } else {
 250                                 if (compound_related) {
 251                                         req->next_status =
 252                                                 NT_STATUS_INVALID_PARAMETER;
 253                                         return NT_STATUS_OK;
 254                                 }
 255                         }
 256                 }
 257         }
 258
 259         return NT_STATUS_OK;
 260 }
 261
 262 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 263 {
 264         struct iovec *vector;
 265         int count;
 266         int idx;
 267
 268         count = req->in.vector_count;
 269         vector = talloc_array(req, struct iovec, count);
 270         if (vector == NULL) {
 271                 return NT_STATUS_NO_MEMORY;
 272         }
 273
 274         vector[0].iov_base      = req->out.nbt_hdr;
 275         vector[0].iov_len       = 4;
 276         SIVAL(req->out.nbt_hdr, 0, 0);
 277
 278         for (idx=1; idx < count; idx += 3) {
 279                 const uint8_t *inhdr = NULL;
 280                 uint32_t in_flags;
 281                 uint8_t *outhdr = NULL;
 282                 uint8_t *outbody = NULL;
 283                 uint32_t next_command_ofs = 0;
 284                 struct iovec *current = &vector[idx];
 285
 286                 if ((idx + 3) < count) {
 287                         /* we have a next command */
 288                         next_command_ofs = SMB2_HDR_BODY + 8;
 289                 }
 290
 291                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 292                 in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 293
 294                 outhdr = talloc_array(vector, uint8_t,
 295                                       SMB2_HDR_BODY + 8);
 296                 if (outhdr == NULL) {
 297                         return NT_STATUS_NO_MEMORY;
 298                 }
 299
 300                 outbody = outhdr + SMB2_HDR_BODY;
 301
 302                 current[0].iov_base     = (void *)outhdr;
 303                 current[0].iov_len      = SMB2_HDR_BODY;
 304
 305                 current[1].iov_base     = (void *)outbody;
 306                 current[1].iov_len      = 8;
 307
 308                 current[2].iov_base     = NULL;
 309                 current[2].iov_len      = 0;
 310
 311                 /* setup the SMB2 header */
 312                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 313                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 314                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 315                 SIVAL(outhdr, SMB2_HDR_STATUS,
 316                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 317                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 318                       SVAL(inhdr, SMB2_HDR_OPCODE));
 319                 /* Make up a number for now... JRA. FIXME ! FIXME !*/
 320                 SSVAL(outhdr, SMB2_HDR_CREDIT,          20);
 321                 SIVAL(outhdr, SMB2_HDR_FLAGS,
 322                       IVAL(inhdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_REDIRECT);
 323                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 324                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 325                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 326                 SIVAL(outhdr, SMB2_HDR_PID,
 327                       IVAL(inhdr, SMB2_HDR_PID));
 328                 SIVAL(outhdr, SMB2_HDR_TID,
 329                       IVAL(inhdr, SMB2_HDR_TID));
 330                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 331                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 332                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 333
 334                 /* setup error body header */
 335                 SSVAL(outbody, 0x00, 0x08 + 1);
 336                 SSVAL(outbody, 0x02, 0);
 337                 SIVAL(outbody, 0x04, 0);
 338         }
 339
 340         req->out.vector = vector;
 341         req->out.vector_count = count;
 342
 343         /* setup the length of the NBT packet */
 344         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 345
 346         return NT_STATUS_OK;
 347 }
 348
 349 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
 350                                          const char *reason,
 351                                          const char *location)
 352 {
 353         DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
 354                   reason, location));
 355         exit_server_cleanly(reason);
 356 }
 357
 358 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 359 {
 360         const uint8_t *inhdr;
 361         int i = req->current_idx;
 362         uint16_t opcode;
 363         uint32_t flags;
 364         NTSTATUS status;
 365         NTSTATUS session_status;
 366
 367         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 368
 369         /* TODO: verify more things */
 370
 371         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 372         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 373         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 374
 375 #define TMP_SMB2_ALLOWED_FLAGS ( \
 376         SMB2_HDR_FLAG_CHAINED | \
 377         SMB2_HDR_FLAG_SIGNED | \
 378         SMB2_HDR_FLAG_DFS)
 379         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 380                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 381         }
 382 #undef TMP_SMB2_ALLOWED_FLAGS
 383
 384         session_status = smbd_smb2_request_check_session(req);
 385
 386         req->do_signing = false;
 387         if (flags & SMB2_HDR_FLAG_SIGNED) {
 388                 if (!NT_STATUS_IS_OK(session_status)) {
 389                         return smbd_smb2_request_error(req, session_status);
 390                 }
 391
 392                 req->do_signing = true;
 393                 status = smb2_signing_check_pdu(req->session->session_key,
 394                                                 &req->in.vector[i], 3);
 395                 if (!NT_STATUS_IS_OK(status)) {
 396                         return smbd_smb2_request_error(req, status);
 397                 }
 398         } else if (req->session && req->session->do_signing) {
 399                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 400         }
 401
 402         if (flags & SMB2_HDR_FLAG_CHAINED) {
 403                 /*
 404                  * This check is mostly for giving the correct error code
 405                  * for compounded requests.
 406                  *
 407                  * TODO: we may need to move this after the session
 408                  *       and tcon checks.
 409                  */
 410                 if (!NT_STATUS_IS_OK(req->next_status)) {
 411                         return smbd_smb2_request_error(req, req->next_status);
 412                 }
 413         } else {
 414                 req->compat_chain_fsp = NULL;
 415         }
 416
 417         switch (opcode) {
 418         case SMB2_OP_NEGPROT:
 419                 return smbd_smb2_request_process_negprot(req);
 420
 421         case SMB2_OP_SESSSETUP:
 422                 return smbd_smb2_request_process_sesssetup(req);
 423
 424         case SMB2_OP_LOGOFF:
 425                 if (!NT_STATUS_IS_OK(session_status)) {
 426                         return smbd_smb2_request_error(req, session_status);
 427                 }
 428                 return smbd_smb2_request_process_logoff(req);
 429
 430         case SMB2_OP_TCON:
 431                 if (!NT_STATUS_IS_OK(session_status)) {
 432                         return smbd_smb2_request_error(req, session_status);
 433                 }
 434                 status = smbd_smb2_request_check_session(req);
 435                 if (!NT_STATUS_IS_OK(status)) {
 436                         return smbd_smb2_request_error(req, status);
 437                 }
 438                 return smbd_smb2_request_process_tcon(req);
 439
 440         case SMB2_OP_TDIS:
 441                 if (!NT_STATUS_IS_OK(session_status)) {
 442                         return smbd_smb2_request_error(req, session_status);
 443                 }
 444                 status = smbd_smb2_request_check_tcon(req);
 445                 if (!NT_STATUS_IS_OK(status)) {
 446                         return smbd_smb2_request_error(req, status);
 447                 }
 448                 return smbd_smb2_request_process_tdis(req);
 449
 450         case SMB2_OP_CREATE:
 451                 if (!NT_STATUS_IS_OK(session_status)) {
 452                         return smbd_smb2_request_error(req, session_status);
 453                 }
 454                 status = smbd_smb2_request_check_tcon(req);
 455                 if (!NT_STATUS_IS_OK(status)) {
 456                         return smbd_smb2_request_error(req, status);
 457                 }
 458                 return smbd_smb2_request_process_create(req);
 459
 460         case SMB2_OP_CLOSE:
 461                 if (!NT_STATUS_IS_OK(session_status)) {
 462                         return smbd_smb2_request_error(req, session_status);
 463                 }
 464                 status = smbd_smb2_request_check_tcon(req);
 465                 if (!NT_STATUS_IS_OK(status)) {
 466                         return smbd_smb2_request_error(req, status);
 467                 }
 468                 return smbd_smb2_request_process_close(req);
 469
 470         case SMB2_OP_FLUSH:
 471                 if (!NT_STATUS_IS_OK(session_status)) {
 472                         return smbd_smb2_request_error(req, session_status);
 473                 }
 474                 status = smbd_smb2_request_check_tcon(req);
 475                 if (!NT_STATUS_IS_OK(status)) {
 476                         return smbd_smb2_request_error(req, status);
 477                 }
 478                 return smbd_smb2_request_process_flush(req);
 479
 480         case SMB2_OP_READ:
 481                 if (!NT_STATUS_IS_OK(session_status)) {
 482                         return smbd_smb2_request_error(req, session_status);
 483                 }
 484                 status = smbd_smb2_request_check_tcon(req);
 485                 if (!NT_STATUS_IS_OK(status)) {
 486                         return smbd_smb2_request_error(req, status);
 487                 }
 488                 return smbd_smb2_request_process_read(req);
 489
 490         case SMB2_OP_WRITE:
 491                 if (!NT_STATUS_IS_OK(session_status)) {
 492                         return smbd_smb2_request_error(req, session_status);
 493                 }
 494                 status = smbd_smb2_request_check_tcon(req);
 495                 if (!NT_STATUS_IS_OK(status)) {
 496                         return smbd_smb2_request_error(req, status);
 497                 }
 498                 return smbd_smb2_request_process_write(req);
 499
 500         case SMB2_OP_LOCK:
 501                 if (!NT_STATUS_IS_OK(session_status)) {
 502                         return smbd_smb2_request_error(req, session_status);
 503                 }
 504                 status = smbd_smb2_request_check_tcon(req);
 505                 if (!NT_STATUS_IS_OK(status)) {
 506                         return smbd_smb2_request_error(req, status);
 507                 }
 508                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 509
 510         case SMB2_OP_IOCTL:
 511                 if (!NT_STATUS_IS_OK(session_status)) {
 512                         return smbd_smb2_request_error(req, session_status);
 513                 }
 514                 status = smbd_smb2_request_check_tcon(req);
 515                 if (!NT_STATUS_IS_OK(status)) {
 516                         return smbd_smb2_request_error(req, status);
 517                 }
 518                 return smbd_smb2_request_process_ioctl(req);
 519
 520         case SMB2_OP_CANCEL:
 521                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 522
 523         case SMB2_OP_KEEPALIVE:
 524                 return smbd_smb2_request_process_keepalive(req);
 525
 526         case SMB2_OP_FIND:
 527                 if (!NT_STATUS_IS_OK(session_status)) {
 528                         return smbd_smb2_request_error(req, session_status);
 529                 }
 530                 status = smbd_smb2_request_check_tcon(req);
 531                 if (!NT_STATUS_IS_OK(status)) {
 532                         return smbd_smb2_request_error(req, status);
 533                 }
 534                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 535
 536         case SMB2_OP_NOTIFY:
 537                 if (!NT_STATUS_IS_OK(session_status)) {
 538                         return smbd_smb2_request_error(req, session_status);
 539                 }
 540                 status = smbd_smb2_request_check_tcon(req);
 541                 if (!NT_STATUS_IS_OK(status)) {
 542                         return smbd_smb2_request_error(req, status);
 543                 }
 544                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 545
 546         case SMB2_OP_GETINFO:
 547                 if (!NT_STATUS_IS_OK(session_status)) {
 548                         return smbd_smb2_request_error(req, session_status);
 549                 }
 550                 status = smbd_smb2_request_check_tcon(req);
 551                 if (!NT_STATUS_IS_OK(status)) {
 552                         return smbd_smb2_request_error(req, status);
 553                 }
 554                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 555
 556         case SMB2_OP_SETINFO:
 557                 if (!NT_STATUS_IS_OK(session_status)) {
 558                         return smbd_smb2_request_error(req, session_status);
 559                 }
 560                 status = smbd_smb2_request_check_tcon(req);
 561                 if (!NT_STATUS_IS_OK(status)) {
 562                         return smbd_smb2_request_error(req, status);
 563                 }
 564                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 565
 566         case SMB2_OP_BREAK:
 567                 if (!NT_STATUS_IS_OK(session_status)) {
 568                         return smbd_smb2_request_error(req, session_status);
 569                 }
 570                 status = smbd_smb2_request_check_tcon(req);
 571                 if (!NT_STATUS_IS_OK(status)) {
 572                         return smbd_smb2_request_error(req, status);
 573                 }
 574                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 575         }
 576
 577         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 578 }
 579
 580 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 581 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 582
 583 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 584 {
 585         struct tevent_req *subreq;
 586
 587         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 588
 589         if (req->do_signing) {
 590                 int i = req->current_idx;
 591                 NTSTATUS status;
 592                 status = smb2_signing_sign_pdu(req->session->session_key,
 593                                                &req->out.vector[i], 3);
 594                 if (!NT_STATUS_IS_OK(status)) {
 595                         return status;
 596                 }
 597         }
 598
 599         req->current_idx += 3;
 600
 601         if (req->current_idx < req->out.vector_count) {
 602                 struct timeval zero = timeval_zero();
 603                 subreq = tevent_wakeup_send(req,
 604                                             req->conn->smb2.event_ctx,
 605                                             zero);
 606                 if (subreq == NULL) {
 607                         return NT_STATUS_NO_MEMORY;
 608                 }
 609                 tevent_req_set_callback(subreq,
 610                                         smbd_smb2_request_dispatch_compound,
 611                                         req);
 612
 613                 return NT_STATUS_OK;
 614         }
 615
 616         subreq = tstream_writev_queue_send(req,
 617                                            req->conn->smb2.event_ctx,
 618                                            req->conn->smb2.stream,
 619                                            req->conn->smb2.send_queue,
 620                                            req->out.vector,
 621                                            req->out.vector_count);
 622         if (subreq == NULL) {
 623                 return NT_STATUS_NO_MEMORY;
 624         }
 625         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 626
 627         return NT_STATUS_OK;
 628 }
 629
 630 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 631 {
 632         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 633                                         struct smbd_smb2_request);
 634         struct smbd_server_connection *conn = req->conn;
 635         NTSTATUS status;
 636
 637         tevent_wakeup_recv(subreq);
 638         TALLOC_FREE(subreq);
 639
 640         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 641                   req->current_idx, req->in.vector_count));
 642
 643         status = smbd_smb2_request_dispatch(req);
 644         if (!NT_STATUS_IS_OK(status)) {
 645                 smbd_server_connection_terminate(conn, nt_errstr(status));
 646                 return;
 647         }
 648 }
 649
 650 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 651 {
 652         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 653                                         struct smbd_smb2_request);
 654         struct smbd_server_connection *conn = req->conn;
 655         int ret;
 656         int sys_errno;
 657         TALLOC_CTX *mem_pool;
 658
 659         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 660         TALLOC_FREE(subreq);
 661         if (ret == -1) {
 662                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 663                 smbd_server_connection_terminate(conn, nt_errstr(status));
 664                 return;
 665         }
 666
 667         mem_pool = req->mem_pool;
 668         req = NULL;
 669         talloc_free(mem_pool);
 670 }
 671
 672 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 673                                     NTSTATUS status,
 674                                     DATA_BLOB *info,
 675                                     const char *location)
 676 {
 677         uint8_t *outhdr;
 678         uint8_t *outbody;
 679         int i = req->current_idx;
 680
 681         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 682                   i, nt_errstr(status), info ? " +info" : "",
 683                   location));
 684
 685         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 686
 687         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 688
 689         outbody = outhdr + SMB2_HDR_BODY;
 690
 691         req->out.vector[i+1].iov_base = (void *)outbody;
 692         req->out.vector[i+1].iov_len = 8;
 693
 694         if (info) {
 695                 SIVAL(outbody, 0x04, info->length);
 696                 req->out.vector[i+2].iov_base   = (void *)info->data;
 697                 req->out.vector[i+2].iov_len    = info->length;
 698         } else {
 699                 req->out.vector[i+2].iov_base = NULL;
 700                 req->out.vector[i+2].iov_len = 0;
 701         }
 702
 703         /*
 704          * if a request fails, all other remaining
 705          * compounded requests should fail too
 706          */
 707         req->next_status = NT_STATUS_INVALID_PARAMETER;
 708
 709         return smbd_smb2_request_reply(req);
 710 }
 711
 712 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 713                                    NTSTATUS status,
 714                                    DATA_BLOB body, DATA_BLOB *dyn,
 715                                    const char *location)
 716 {
 717         uint8_t *outhdr;
 718         uint8_t *outdyn;
 719         int i = req->current_idx;
 720         uint32_t next_command_ofs;
 721
 722         DEBUG(10,("smbd_smb2_request_done_ex: "
 723                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 724                   i, nt_errstr(status), (unsigned int)body.length,
 725                   dyn ? "yes": "no",
 726                   (unsigned int)(dyn ? dyn->length : 0),
 727                   location));
 728
 729         if (body.length < 2) {
 730                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 731         }
 732
 733         if ((body.length % 2) != 0) {
 734                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 735         }
 736
 737         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 738         /* the fallback dynamic buffer */
 739         outdyn = outhdr + SMB2_HDR_BODY + 8;
 740
 741         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 742         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 743
 744         req->out.vector[i+1].iov_base = (void *)body.data;
 745         req->out.vector[i+1].iov_len = body.length;
 746
 747         if (dyn) {
 748                 req->out.vector[i+2].iov_base   = (void *)dyn->data;
 749                 req->out.vector[i+2].iov_len    = dyn->length;
 750         } else {
 751                 req->out.vector[i+2].iov_base = NULL;
 752                 req->out.vector[i+2].iov_len = 0;
 753         }
 754
 755         /* see if we need to recalculate the offset to the next response */
 756         if (next_command_ofs > 0) {
 757                 next_command_ofs  = SMB2_HDR_BODY;
 758                 next_command_ofs += req->out.vector[i+1].iov_len;
 759                 next_command_ofs += req->out.vector[i+2].iov_len;
 760         }
 761
 762         if ((next_command_ofs % 8) != 0) {
 763                 size_t pad_size = 8 - (next_command_ofs % 8);
 764                 if (req->out.vector[i+2].iov_len == 0) {
 765                         /*
 766                          * if the dyn buffer is empty
 767                          * we can use it to add padding
 768                          */
 769                         uint8_t *pad;
 770
 771                         pad = talloc_zero_array(req->out.vector,
 772                                                 uint8_t, pad_size);
 773                         if (pad == NULL) {
 774                                 return smbd_smb2_request_error(req,
 775                                                 NT_STATUS_NO_MEMORY);
 776                         }
 777
 778                         req->out.vector[i+2].iov_base = (void *)pad;
 779                         req->out.vector[i+2].iov_len = pad_size;
 780                 } else {
 781                         /*
 782                          * For now we copy the dynamic buffer
 783                          * and add the padding to the new buffer
 784                          */
 785                         size_t old_size;
 786                         uint8_t *old_dyn;
 787                         size_t new_size;
 788                         uint8_t *new_dyn;
 789
 790                         old_size = req->out.vector[i+2].iov_len;
 791                         old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
 792
 793                         new_size = old_size + pad_size;
 794                         new_dyn = talloc_array(req->out.vector,
 795                                                uint8_t, new_size);
 796                         if (new_dyn == NULL) {
 797                                 return smbd_smb2_request_error(req,
 798                                                 NT_STATUS_NO_MEMORY);
 799                         }
 800
 801                         memcpy(new_dyn, old_dyn, old_size);
 802                         memset(new_dyn + old_size, 0, pad_size);
 803
 804                         req->out.vector[i+2].iov_base = (void *)new_dyn;
 805                         req->out.vector[i+2].iov_len = new_size;
 806
 807                         TALLOC_FREE(old_dyn);
 808                 }
 809                 next_command_ofs += pad_size;
 810         }
 811
 812         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 813
 814         return smbd_smb2_request_reply(req);
 815 }
 816
 817 struct smbd_smb2_request_read_state {
 818         size_t missing;
 819         bool asked_for_header;
 820         struct smbd_smb2_request *smb2_req;
 821 };
 822
 823 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 824                                          void *private_data,
 825                                          TALLOC_CTX *mem_ctx,
 826                                          struct iovec **_vector,
 827                                          size_t *_count);
 828 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 829
 830 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 831                                         struct tevent_context *ev,
 832                                         struct smbd_server_connection *conn)
 833 {
 834         struct tevent_req *req;
 835         struct smbd_smb2_request_read_state *state;
 836         struct tevent_req *subreq;
 837         TALLOC_CTX *mem_pool;
 838
 839         req = tevent_req_create(mem_ctx, &state,
 840                                 struct smbd_smb2_request_read_state);
 841         if (req == NULL) {
 842                 return NULL;
 843         }
 844         state->missing = 0;
 845         state->asked_for_header = false;
 846
 847         mem_pool = talloc_pool(state, 8192);
 848         if (tevent_req_nomem(mem_pool, req)) {
 849                 return tevent_req_post(req, ev);
 850         }
 851
 852         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 853         if (tevent_req_nomem(state->smb2_req, req)) {
 854                 return tevent_req_post(req, ev);
 855         }
 856
 857         state->smb2_req->mem_pool       = mem_pool;
 858         state->smb2_req->conn           = conn;
 859
 860         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 861                                               conn->smb2.recv_queue,
 862                                               smbd_smb2_request_next_vector,
 863                                               state);
 864         if (tevent_req_nomem(subreq, req)) {
 865                 return tevent_req_post(req, ev);
 866         }
 867         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 868
 869         return req;
 870 }
 871
 872 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 873                                          void *private_data,
 874                                          TALLOC_CTX *mem_ctx,
 875                                          struct iovec **_vector,
 876                                          size_t *_count)
 877 {
 878         struct smbd_smb2_request_read_state *state =
 879                 talloc_get_type_abort(private_data,
 880                 struct smbd_smb2_request_read_state);
 881         struct smbd_smb2_request *req = state->smb2_req;
 882         struct iovec *vector;
 883         int idx = req->in.vector_count;
 884         size_t len = 0;
 885         uint8_t *buf = NULL;
 886
 887         if (req->in.vector_count == 0) {
 888                 /*
 889                  * first we need to get the NBT header
 890                  */
 891                 req->in.vector = talloc_array(req, struct iovec,
 892                                               req->in.vector_count + 1);
 893                 if (req->in.vector == NULL) {
 894                         return -1;
 895                 }
 896                 req->in.vector_count += 1;
 897
 898                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 899                 req->in.vector[idx].iov_len     = 4;
 900
 901                 vector = talloc_array(mem_ctx, struct iovec, 1);
 902                 if (vector == NULL) {
 903                         return -1;
 904                 }
 905
 906                 vector[0] = req->in.vector[idx];
 907
 908                 *_vector = vector;
 909                 *_count = 1;
 910                 return 0;
 911         }
 912
 913         if (req->in.vector_count == 1) {
 914                 /*
 915                  * Now we analyze the NBT header
 916                  */
 917                 state->missing = smb2_len(req->in.vector[0].iov_base);
 918
 919                 if (state->missing == 0) {
 920                         /* if there're no remaining bytes, we're done */
 921                         *_vector = NULL;
 922                         *_count = 0;
 923                         return 0;
 924                 }
 925
 926                 req->in.vector = talloc_realloc(req, req->in.vector,
 927                                                 struct iovec,
 928                                                 req->in.vector_count + 1);
 929                 if (req->in.vector == NULL) {
 930                         return -1;
 931                 }
 932                 req->in.vector_count += 1;
 933
 934                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 935                         /*
 936                          * it's a special NBT message,
 937                          * so get all remaining bytes
 938                          */
 939                         len = state->missing;
 940                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 941                         /*
 942                          * it's an invalid message, just read what we can get
 943                          * and let the caller handle the error
 944                          */
 945                         len = state->missing;
 946                 } else {
 947                         /*
 948                          * We assume it's a SMB2 request,
 949                          * and we first get the header and the
 950                          * first 2 bytes (the struct size) of the body
 951                          */
 952                         len = SMB2_HDR_BODY + 2;
 953
 954                         state->asked_for_header = true;
 955                 }
 956
 957                 state->missing -= len;
 958
 959                 buf = talloc_array(req->in.vector, uint8_t, len);
 960                 if (buf == NULL) {
 961                         return -1;
 962                 }
 963
 964                 req->in.vector[idx].iov_base    = (void *)buf;
 965                 req->in.vector[idx].iov_len     = len;
 966
 967                 vector = talloc_array(mem_ctx, struct iovec, 1);
 968                 if (vector == NULL) {
 969                         return -1;
 970                 }
 971
 972                 vector[0] = req->in.vector[idx];
 973
 974                 *_vector = vector;
 975                 *_count = 1;
 976                 return 0;
 977         }
 978
 979         if (state->missing == 0) {
 980                 /* if there're no remaining bytes, we're done */
 981                 *_vector = NULL;
 982                 *_count = 0;
 983                 return 0;
 984         }
 985
 986         if (state->asked_for_header) {
 987                 const uint8_t *hdr;
 988                 size_t full_size;
 989                 size_t next_command_ofs;
 990                 size_t body_size;
 991                 uint8_t *body;
 992                 size_t dyn_size;
 993                 uint8_t *dyn;
 994                 bool invalid = false;
 995
 996                 state->asked_for_header = false;
 997
 998                 /*
 999                  * We got the SMB2 header and the first 2 bytes
1000                  * of the body. We fix the size to just the header
1001                  * and manually copy the 2 first bytes to the body section
1002                  */
1003                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
1004                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
1005
1006                 /* allocate vectors for body and dynamic areas */
1007                 req->in.vector = talloc_realloc(req, req->in.vector,
1008                                                 struct iovec,
1009                                                 req->in.vector_count + 2);
1010                 if (req->in.vector == NULL) {
1011                         return -1;
1012                 }
1013                 req->in.vector_count += 2;
1014
1015                 full_size = state->missing + SMB2_HDR_BODY + 2;
1016                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1017                 body_size = SVAL(hdr, SMB2_HDR_BODY);
1018
1019                 if (next_command_ofs != 0) {
1020                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1021                                 /*
1022                                  * this is invalid, just return a zero
1023                                  * body and let the caller deal with the error
1024                                  */
1025                                 invalid = true;
1026                         } else if (next_command_ofs > full_size) {
1027                                 /*
1028                                  * this is invalid, just return a zero
1029                                  * body and let the caller deal with the error
1030                                  */
1031                                 invalid = true;
1032                         } else {
1033                                 full_size = next_command_ofs;
1034                         }
1035                 }
1036
1037                 if (!invalid) {
1038                         if (body_size < 2) {
1039                                 /*
1040                                  * this is invalid, just return a zero
1041                                  * body and let the caller deal with the error
1042                                  */
1043                                 invalid = true;
1044                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
1045                                 /*
1046                                  * this is invalid, just return a zero
1047                                  * body and let the caller deal with the error
1048                                  */
1049                                 invalid = true;
1050                         }
1051                 }
1052
1053                 if (invalid) {
1054                         /* the caller should check this */
1055                         body_size = 0;
1056                 }
1057
1058                 if ((body_size % 2) != 0) {
1059                         body_size -= 1;
1060                 }
1061
1062                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1063
1064                 state->missing -= (body_size - 2) + dyn_size;
1065
1066                 body = talloc_array(req->in.vector, uint8_t, body_size);
1067                 if (body == NULL) {
1068                         return -1;
1069                 }
1070
1071                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1072                 if (dyn == NULL) {
1073                         return -1;
1074                 }
1075
1076                 req->in.vector[idx].iov_base    = (void *)body;
1077                 req->in.vector[idx].iov_len     = body_size;
1078                 req->in.vector[idx+1].iov_base  = (void *)dyn;
1079                 req->in.vector[idx+1].iov_len   = dyn_size;
1080
1081                 vector = talloc_array(mem_ctx, struct iovec, 2);
1082                 if (vector == NULL) {
1083                         return -1;
1084                 }
1085
1086                 /*
1087                  * the first 2 bytes of the body were already fetched
1088                  * together with the header
1089                  */
1090                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1091                 vector[0].iov_base = body + 2;
1092                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
1093
1094                 vector[1] = req->in.vector[idx+1];
1095
1096                 *_vector = vector;
1097                 *_count = 2;
1098                 return 0;
1099         }
1100
1101         /*
1102          * when we endup here, we're looking for a new SMB2 request
1103          * next. And we ask for its header and the first 2 bytes of
1104          * the body (like we did for the first SMB2 request).
1105          */
1106
1107         req->in.vector = talloc_realloc(req, req->in.vector,
1108                                         struct iovec,
1109                                         req->in.vector_count + 1);
1110         if (req->in.vector == NULL) {
1111                 return -1;
1112         }
1113         req->in.vector_count += 1;
1114
1115         /*
1116          * We assume it's a SMB2 request,
1117          * and we first get the header and the
1118          * first 2 bytes (the struct size) of the body
1119          */
1120         len = SMB2_HDR_BODY + 2;
1121
1122         if (len > state->missing) {
1123                 /* let the caller handle the error */
1124                 len = state->missing;
1125         }
1126
1127         state->missing -= len;
1128         state->asked_for_header = true;
1129
1130         buf = talloc_array(req->in.vector, uint8_t, len);
1131         if (buf == NULL) {
1132                 return -1;
1133         }
1134
1135         req->in.vector[idx].iov_base    = (void *)buf;
1136         req->in.vector[idx].iov_len     = len;
1137
1138         vector = talloc_array(mem_ctx, struct iovec, 1);
1139         if (vector == NULL) {
1140                 return -1;
1141         }
1142
1143         vector[0] = req->in.vector[idx];
1144
1145         *_vector = vector;
1146         *_count = 1;
1147         return 0;
1148 }
1149
1150 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1151 {
1152         struct tevent_req *req =
1153                 tevent_req_callback_data(subreq,
1154                 struct tevent_req);
1155         int ret;
1156         int sys_errno;
1157         NTSTATUS status;
1158
1159         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1160         if (ret == -1) {
1161                 status = map_nt_error_from_unix(sys_errno);
1162                 tevent_req_nterror(req, status);
1163                 return;
1164         }
1165
1166         tevent_req_done(req);
1167 }
1168
1169 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1170                                             TALLOC_CTX *mem_ctx,
1171                                             struct smbd_smb2_request **_smb2_req)
1172 {
1173         struct smbd_smb2_request_read_state *state =
1174                 tevent_req_data(req,
1175                 struct smbd_smb2_request_read_state);
1176         NTSTATUS status;
1177
1178         if (tevent_req_is_nterror(req, &status)) {
1179                 tevent_req_received(req);
1180                 return status;
1181         }
1182
1183         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1184         *_smb2_req = state->smb2_req;
1185         tevent_req_received(req);
1186         return NT_STATUS_OK;
1187 }
1188
1189 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1190
1191 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1192                              const uint8_t *inbuf, size_t size)
1193 {
1194         NTSTATUS status;
1195         struct smbd_smb2_request *req;
1196         struct tevent_req *subreq;
1197
1198         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1199                  (unsigned int)size));
1200
1201         status = smbd_initialize_smb2(conn);
1202         if (!NT_STATUS_IS_OK(status)) {
1203                 smbd_server_connection_terminate(conn, nt_errstr(status));
1204                 return;
1205         }
1206
1207         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1208         if (!NT_STATUS_IS_OK(status)) {
1209                 smbd_server_connection_terminate(conn, nt_errstr(status));
1210                 return;
1211         }
1212
1213         status = smbd_smb2_request_setup_out(req);
1214         if (!NT_STATUS_IS_OK(status)) {
1215                 smbd_server_connection_terminate(conn, nt_errstr(status));
1216                 return;
1217         }
1218
1219         status = smbd_smb2_request_dispatch(req);
1220         if (!NT_STATUS_IS_OK(status)) {
1221                 smbd_server_connection_terminate(conn, nt_errstr(status));
1222                 return;
1223         }
1224
1225         /* ask for the next request */
1226         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1227         if (subreq == NULL) {
1228                 smbd_server_connection_terminate(conn, "no memory for reading");
1229                 return;
1230         }
1231         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1232 }
1233
1234 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1235 {
1236         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1237                                               struct smbd_server_connection);
1238         NTSTATUS status;
1239         struct smbd_smb2_request *req;
1240
1241         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1242         TALLOC_FREE(subreq);
1243         if (!NT_STATUS_IS_OK(status)) {
1244                 smbd_server_connection_terminate(conn, nt_errstr(status));
1245                 return;
1246         }
1247
1248         if (req->in.nbt_hdr[0] != 0x00) {
1249                 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1250                          req->in.nbt_hdr[0]));
1251                 talloc_free(req->mem_pool);
1252                 req = NULL;
1253                 goto next;
1254         }
1255
1256         req->current_idx = 1;
1257
1258         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1259                  req->current_idx, req->in.vector_count));
1260
1261         status = smbd_smb2_request_validate(req);
1262         if (!NT_STATUS_IS_OK(status)) {
1263                 smbd_server_connection_terminate(conn, nt_errstr(status));
1264                 return;
1265         }
1266
1267         status = smbd_smb2_request_setup_out(req);
1268         if (!NT_STATUS_IS_OK(status)) {
1269                 smbd_server_connection_terminate(conn, nt_errstr(status));
1270                 return;
1271         }
1272
1273         status = smbd_smb2_request_dispatch(req);
1274         if (!NT_STATUS_IS_OK(status)) {
1275                 smbd_server_connection_terminate(conn, nt_errstr(status));
1276                 return;
1277         }
1278
1279 next:
1280         /* ask for the next request (this constructs the main loop) */
1281         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1282         if (subreq == NULL) {
1283                 smbd_server_connection_terminate(conn, "no memory for reading");
1284                 return;
1285         }
1286         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1287 }