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 #if 0
 241                         /*
 242                          * It seems the this tests are wrong
 243                          * see the SMB2-COMPOUND test
 244                          */
 245
 246                         /*
 247                          * all other requests should match the 2nd one
 248                          */
 249                         if (flags & SMB2_HDR_FLAG_CHAINED) {
 250                                 if (!compound_related) {
 251                                         req->next_status =
 252                                                 NT_STATUS_INVALID_PARAMETER;
 253                                         return NT_STATUS_OK;
 254                                 }
 255                         } else {
 256                                 if (compound_related) {
 257                                         req->next_status =
 258                                                 NT_STATUS_INVALID_PARAMETER;
 259                                         return NT_STATUS_OK;
 260                                 }
 261                         }
 262 #endif
 263                 }
 264         }
 265
 266         return NT_STATUS_OK;
 267 }
 268
 269 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 270 {
 271         struct iovec *vector;
 272         int count;
 273         int idx;
 274
 275         count = req->in.vector_count;
 276         vector = talloc_array(req, struct iovec, count);
 277         if (vector == NULL) {
 278                 return NT_STATUS_NO_MEMORY;
 279         }
 280
 281         vector[0].iov_base      = req->out.nbt_hdr;
 282         vector[0].iov_len       = 4;
 283         SIVAL(req->out.nbt_hdr, 0, 0);
 284
 285         for (idx=1; idx < count; idx += 3) {
 286                 const uint8_t *inhdr = NULL;
 287                 uint32_t in_flags;
 288                 uint8_t *outhdr = NULL;
 289                 uint8_t *outbody = NULL;
 290                 uint32_t next_command_ofs = 0;
 291                 struct iovec *current = &vector[idx];
 292
 293                 if ((idx + 3) < count) {
 294                         /* we have a next command */
 295                         next_command_ofs = SMB2_HDR_BODY + 8;
 296                 }
 297
 298                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 299                 in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 300
 301                 outhdr = talloc_array(vector, uint8_t,
 302                                       SMB2_HDR_BODY + 8);
 303                 if (outhdr == NULL) {
 304                         return NT_STATUS_NO_MEMORY;
 305                 }
 306
 307                 outbody = outhdr + SMB2_HDR_BODY;
 308
 309                 current[0].iov_base     = (void *)outhdr;
 310                 current[0].iov_len      = SMB2_HDR_BODY;
 311
 312                 current[1].iov_base     = (void *)outbody;
 313                 current[1].iov_len      = 8;
 314
 315                 current[2].iov_base     = NULL;
 316                 current[2].iov_len      = 0;
 317
 318                 /* setup the SMB2 header */
 319                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 320                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 321                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 322                 SIVAL(outhdr, SMB2_HDR_STATUS,
 323                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 324                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 325                       SVAL(inhdr, SMB2_HDR_OPCODE));
 326                 /* Make up a number for now... JRA. FIXME ! FIXME !*/
 327                 SSVAL(outhdr, SMB2_HDR_CREDIT,          20);
 328                 SIVAL(outhdr, SMB2_HDR_FLAGS,
 329                       IVAL(inhdr, SMB2_HDR_FLAGS) | SMB2_HDR_FLAG_REDIRECT);
 330                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 331                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 332                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 333                 SIVAL(outhdr, SMB2_HDR_PID,
 334                       IVAL(inhdr, SMB2_HDR_PID));
 335                 SIVAL(outhdr, SMB2_HDR_TID,
 336                       IVAL(inhdr, SMB2_HDR_TID));
 337                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 338                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 339                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 340
 341                 /* setup error body header */
 342                 SSVAL(outbody, 0x00, 0x08 + 1);
 343                 SSVAL(outbody, 0x02, 0);
 344                 SIVAL(outbody, 0x04, 0);
 345         }
 346
 347         req->out.vector = vector;
 348         req->out.vector_count = count;
 349
 350         /* setup the length of the NBT packet */
 351         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 352
 353         return NT_STATUS_OK;
 354 }
 355
 356 void smbd_server_connection_terminate_ex(struct smbd_server_connection *sconn,
 357                                          const char *reason,
 358                                          const char *location)
 359 {
 360         DEBUG(10,("smbd_server_connection_terminate_ex: reason[%s] at %s\n",
 361                   reason, location));
 362         exit_server_cleanly(reason);
 363 }
 364
 365 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 366 {
 367         const uint8_t *inhdr;
 368         int i = req->current_idx;
 369         uint16_t opcode;
 370         uint32_t flags;
 371         NTSTATUS status;
 372         NTSTATUS session_status;
 373
 374         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 375
 376         /* TODO: verify more things */
 377
 378         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 379         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 380         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 381
 382 #define TMP_SMB2_ALLOWED_FLAGS ( \
 383         SMB2_HDR_FLAG_CHAINED | \
 384         SMB2_HDR_FLAG_SIGNED | \
 385         SMB2_HDR_FLAG_DFS)
 386         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 387                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 388         }
 389 #undef TMP_SMB2_ALLOWED_FLAGS
 390
 391         session_status = smbd_smb2_request_check_session(req);
 392
 393         req->do_signing = false;
 394         if (flags & SMB2_HDR_FLAG_SIGNED) {
 395                 if (!NT_STATUS_IS_OK(session_status)) {
 396                         return smbd_smb2_request_error(req, session_status);
 397                 }
 398
 399                 req->do_signing = true;
 400                 status = smb2_signing_check_pdu(req->session->session_key,
 401                                                 &req->in.vector[i], 3);
 402                 if (!NT_STATUS_IS_OK(status)) {
 403                         return smbd_smb2_request_error(req, status);
 404                 }
 405         } else if (req->session && req->session->do_signing) {
 406                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 407         }
 408
 409         if (flags & SMB2_HDR_FLAG_CHAINED) {
 410                 /*
 411                  * This check is mostly for giving the correct error code
 412                  * for compounded requests.
 413                  *
 414                  * TODO: we may need to move this after the session
 415                  *       and tcon checks.
 416                  */
 417                 if (!NT_STATUS_IS_OK(req->next_status)) {
 418                         return smbd_smb2_request_error(req, req->next_status);
 419                 }
 420         } else {
 421                 req->compat_chain_fsp = NULL;
 422         }
 423
 424         switch (opcode) {
 425         case SMB2_OP_NEGPROT:
 426                 return smbd_smb2_request_process_negprot(req);
 427
 428         case SMB2_OP_SESSSETUP:
 429                 return smbd_smb2_request_process_sesssetup(req);
 430
 431         case SMB2_OP_LOGOFF:
 432                 if (!NT_STATUS_IS_OK(session_status)) {
 433                         return smbd_smb2_request_error(req, session_status);
 434                 }
 435                 return smbd_smb2_request_process_logoff(req);
 436
 437         case SMB2_OP_TCON:
 438                 if (!NT_STATUS_IS_OK(session_status)) {
 439                         return smbd_smb2_request_error(req, session_status);
 440                 }
 441                 status = smbd_smb2_request_check_session(req);
 442                 if (!NT_STATUS_IS_OK(status)) {
 443                         return smbd_smb2_request_error(req, status);
 444                 }
 445                 return smbd_smb2_request_process_tcon(req);
 446
 447         case SMB2_OP_TDIS:
 448                 if (!NT_STATUS_IS_OK(session_status)) {
 449                         return smbd_smb2_request_error(req, session_status);
 450                 }
 451                 status = smbd_smb2_request_check_tcon(req);
 452                 if (!NT_STATUS_IS_OK(status)) {
 453                         return smbd_smb2_request_error(req, status);
 454                 }
 455                 return smbd_smb2_request_process_tdis(req);
 456
 457         case SMB2_OP_CREATE:
 458                 if (!NT_STATUS_IS_OK(session_status)) {
 459                         return smbd_smb2_request_error(req, session_status);
 460                 }
 461                 status = smbd_smb2_request_check_tcon(req);
 462                 if (!NT_STATUS_IS_OK(status)) {
 463                         return smbd_smb2_request_error(req, status);
 464                 }
 465                 return smbd_smb2_request_process_create(req);
 466
 467         case SMB2_OP_CLOSE:
 468                 if (!NT_STATUS_IS_OK(session_status)) {
 469                         return smbd_smb2_request_error(req, session_status);
 470                 }
 471                 status = smbd_smb2_request_check_tcon(req);
 472                 if (!NT_STATUS_IS_OK(status)) {
 473                         return smbd_smb2_request_error(req, status);
 474                 }
 475                 return smbd_smb2_request_process_close(req);
 476
 477         case SMB2_OP_FLUSH:
 478                 if (!NT_STATUS_IS_OK(session_status)) {
 479                         return smbd_smb2_request_error(req, session_status);
 480                 }
 481                 status = smbd_smb2_request_check_tcon(req);
 482                 if (!NT_STATUS_IS_OK(status)) {
 483                         return smbd_smb2_request_error(req, status);
 484                 }
 485                 return smbd_smb2_request_process_flush(req);
 486
 487         case SMB2_OP_READ:
 488                 if (!NT_STATUS_IS_OK(session_status)) {
 489                         return smbd_smb2_request_error(req, session_status);
 490                 }
 491                 status = smbd_smb2_request_check_tcon(req);
 492                 if (!NT_STATUS_IS_OK(status)) {
 493                         return smbd_smb2_request_error(req, status);
 494                 }
 495                 return smbd_smb2_request_process_read(req);
 496
 497         case SMB2_OP_WRITE:
 498                 if (!NT_STATUS_IS_OK(session_status)) {
 499                         return smbd_smb2_request_error(req, session_status);
 500                 }
 501                 status = smbd_smb2_request_check_tcon(req);
 502                 if (!NT_STATUS_IS_OK(status)) {
 503                         return smbd_smb2_request_error(req, status);
 504                 }
 505                 return smbd_smb2_request_process_write(req);
 506
 507         case SMB2_OP_LOCK:
 508                 if (!NT_STATUS_IS_OK(session_status)) {
 509                         return smbd_smb2_request_error(req, session_status);
 510                 }
 511                 status = smbd_smb2_request_check_tcon(req);
 512                 if (!NT_STATUS_IS_OK(status)) {
 513                         return smbd_smb2_request_error(req, status);
 514                 }
 515                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 516
 517         case SMB2_OP_IOCTL:
 518                 if (!NT_STATUS_IS_OK(session_status)) {
 519                         return smbd_smb2_request_error(req, session_status);
 520                 }
 521                 status = smbd_smb2_request_check_tcon(req);
 522                 if (!NT_STATUS_IS_OK(status)) {
 523                         return smbd_smb2_request_error(req, status);
 524                 }
 525                 return smbd_smb2_request_process_ioctl(req);
 526
 527         case SMB2_OP_CANCEL:
 528                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 529
 530         case SMB2_OP_KEEPALIVE:
 531                 return smbd_smb2_request_process_keepalive(req);
 532
 533         case SMB2_OP_FIND:
 534                 if (!NT_STATUS_IS_OK(session_status)) {
 535                         return smbd_smb2_request_error(req, session_status);
 536                 }
 537                 status = smbd_smb2_request_check_tcon(req);
 538                 if (!NT_STATUS_IS_OK(status)) {
 539                         return smbd_smb2_request_error(req, status);
 540                 }
 541                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 542
 543         case SMB2_OP_NOTIFY:
 544                 if (!NT_STATUS_IS_OK(session_status)) {
 545                         return smbd_smb2_request_error(req, session_status);
 546                 }
 547                 status = smbd_smb2_request_check_tcon(req);
 548                 if (!NT_STATUS_IS_OK(status)) {
 549                         return smbd_smb2_request_error(req, status);
 550                 }
 551                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 552
 553         case SMB2_OP_GETINFO:
 554                 if (!NT_STATUS_IS_OK(session_status)) {
 555                         return smbd_smb2_request_error(req, session_status);
 556                 }
 557                 status = smbd_smb2_request_check_tcon(req);
 558                 if (!NT_STATUS_IS_OK(status)) {
 559                         return smbd_smb2_request_error(req, status);
 560                 }
 561                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 562
 563         case SMB2_OP_SETINFO:
 564                 if (!NT_STATUS_IS_OK(session_status)) {
 565                         return smbd_smb2_request_error(req, session_status);
 566                 }
 567                 status = smbd_smb2_request_check_tcon(req);
 568                 if (!NT_STATUS_IS_OK(status)) {
 569                         return smbd_smb2_request_error(req, status);
 570                 }
 571                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 572
 573         case SMB2_OP_BREAK:
 574                 if (!NT_STATUS_IS_OK(session_status)) {
 575                         return smbd_smb2_request_error(req, session_status);
 576                 }
 577                 status = smbd_smb2_request_check_tcon(req);
 578                 if (!NT_STATUS_IS_OK(status)) {
 579                         return smbd_smb2_request_error(req, status);
 580                 }
 581                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 582         }
 583
 584         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 585 }
 586
 587 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 588 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 589
 590 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 591 {
 592         struct tevent_req *subreq;
 593
 594         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 595
 596         if (req->do_signing) {
 597                 int i = req->current_idx;
 598                 NTSTATUS status;
 599                 status = smb2_signing_sign_pdu(req->session->session_key,
 600                                                &req->out.vector[i], 3);
 601                 if (!NT_STATUS_IS_OK(status)) {
 602                         return status;
 603                 }
 604         }
 605
 606         req->current_idx += 3;
 607
 608         if (req->current_idx < req->out.vector_count) {
 609                 struct timeval zero = timeval_zero();
 610                 subreq = tevent_wakeup_send(req,
 611                                             req->conn->smb2.event_ctx,
 612                                             zero);
 613                 if (subreq == NULL) {
 614                         return NT_STATUS_NO_MEMORY;
 615                 }
 616                 tevent_req_set_callback(subreq,
 617                                         smbd_smb2_request_dispatch_compound,
 618                                         req);
 619
 620                 return NT_STATUS_OK;
 621         }
 622
 623         subreq = tstream_writev_queue_send(req,
 624                                            req->conn->smb2.event_ctx,
 625                                            req->conn->smb2.stream,
 626                                            req->conn->smb2.send_queue,
 627                                            req->out.vector,
 628                                            req->out.vector_count);
 629         if (subreq == NULL) {
 630                 return NT_STATUS_NO_MEMORY;
 631         }
 632         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 633
 634         return NT_STATUS_OK;
 635 }
 636
 637 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 638 {
 639         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 640                                         struct smbd_smb2_request);
 641         struct smbd_server_connection *conn = req->conn;
 642         NTSTATUS status;
 643
 644         tevent_wakeup_recv(subreq);
 645         TALLOC_FREE(subreq);
 646
 647         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 648                   req->current_idx, req->in.vector_count));
 649
 650         status = smbd_smb2_request_dispatch(req);
 651         if (!NT_STATUS_IS_OK(status)) {
 652                 smbd_server_connection_terminate(conn, nt_errstr(status));
 653                 return;
 654         }
 655 }
 656
 657 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 658 {
 659         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 660                                         struct smbd_smb2_request);
 661         struct smbd_server_connection *conn = req->conn;
 662         int ret;
 663         int sys_errno;
 664         TALLOC_CTX *mem_pool;
 665
 666         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 667         TALLOC_FREE(subreq);
 668         if (ret == -1) {
 669                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 670                 smbd_server_connection_terminate(conn, nt_errstr(status));
 671                 return;
 672         }
 673
 674         mem_pool = req->mem_pool;
 675         req = NULL;
 676         talloc_free(mem_pool);
 677 }
 678
 679 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 680                                     NTSTATUS status,
 681                                     DATA_BLOB *info,
 682                                     const char *location)
 683 {
 684         uint8_t *outhdr;
 685         uint8_t *outbody;
 686         int i = req->current_idx;
 687
 688         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s] |%s| at %s\n",
 689                   i, nt_errstr(status), info ? " +info" : "",
 690                   location));
 691
 692         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 693
 694         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 695
 696         outbody = outhdr + SMB2_HDR_BODY;
 697
 698         req->out.vector[i+1].iov_base = (void *)outbody;
 699         req->out.vector[i+1].iov_len = 8;
 700
 701         if (info) {
 702                 SIVAL(outbody, 0x04, info->length);
 703                 req->out.vector[i+2].iov_base   = (void *)info->data;
 704                 req->out.vector[i+2].iov_len    = info->length;
 705         } else {
 706                 req->out.vector[i+2].iov_base = NULL;
 707                 req->out.vector[i+2].iov_len = 0;
 708         }
 709
 710         /*
 711          * if a request fails, all other remaining
 712          * compounded requests should fail too
 713          */
 714         req->next_status = NT_STATUS_INVALID_PARAMETER;
 715
 716         return smbd_smb2_request_reply(req);
 717 }
 718
 719 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 720                                    NTSTATUS status,
 721                                    DATA_BLOB body, DATA_BLOB *dyn,
 722                                    const char *location)
 723 {
 724         uint8_t *outhdr;
 725         uint8_t *outdyn;
 726         int i = req->current_idx;
 727         uint32_t next_command_ofs;
 728
 729         DEBUG(10,("smbd_smb2_request_done_ex: "
 730                   "idx[%d] status[%s] body[%u] dyn[%s:%u] at %s\n",
 731                   i, nt_errstr(status), (unsigned int)body.length,
 732                   dyn ? "yes": "no",
 733                   (unsigned int)(dyn ? dyn->length : 0),
 734                   location));
 735
 736         if (body.length < 2) {
 737                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 738         }
 739
 740         if ((body.length % 2) != 0) {
 741                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 742         }
 743
 744         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 745         /* the fallback dynamic buffer */
 746         outdyn = outhdr + SMB2_HDR_BODY + 8;
 747
 748         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 749         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 750
 751         req->out.vector[i+1].iov_base = (void *)body.data;
 752         req->out.vector[i+1].iov_len = body.length;
 753
 754         if (dyn) {
 755                 req->out.vector[i+2].iov_base   = (void *)dyn->data;
 756                 req->out.vector[i+2].iov_len    = dyn->length;
 757         } else {
 758                 req->out.vector[i+2].iov_base = NULL;
 759                 req->out.vector[i+2].iov_len = 0;
 760         }
 761
 762         /* see if we need to recalculate the offset to the next response */
 763         if (next_command_ofs > 0) {
 764                 next_command_ofs  = SMB2_HDR_BODY;
 765                 next_command_ofs += req->out.vector[i+1].iov_len;
 766                 next_command_ofs += req->out.vector[i+2].iov_len;
 767         }
 768
 769         if ((next_command_ofs % 8) != 0) {
 770                 size_t pad_size = 8 - (next_command_ofs % 8);
 771                 if (req->out.vector[i+2].iov_len == 0) {
 772                         /*
 773                          * if the dyn buffer is empty
 774                          * we can use it to add padding
 775                          */
 776                         uint8_t *pad;
 777
 778                         pad = talloc_zero_array(req->out.vector,
 779                                                 uint8_t, pad_size);
 780                         if (pad == NULL) {
 781                                 return smbd_smb2_request_error(req,
 782                                                 NT_STATUS_NO_MEMORY);
 783                         }
 784
 785                         req->out.vector[i+2].iov_base = (void *)pad;
 786                         req->out.vector[i+2].iov_len = pad_size;
 787                 } else {
 788                         /*
 789                          * For now we copy the dynamic buffer
 790                          * and add the padding to the new buffer
 791                          */
 792                         size_t old_size;
 793                         uint8_t *old_dyn;
 794                         size_t new_size;
 795                         uint8_t *new_dyn;
 796
 797                         old_size = req->out.vector[i+2].iov_len;
 798                         old_dyn = (uint8_t *)req->out.vector[i+2].iov_base;
 799
 800                         new_size = old_size + pad_size;
 801                         new_dyn = talloc_array(req->out.vector,
 802                                                uint8_t, new_size);
 803                         if (new_dyn == NULL) {
 804                                 return smbd_smb2_request_error(req,
 805                                                 NT_STATUS_NO_MEMORY);
 806                         }
 807
 808                         memcpy(new_dyn, old_dyn, old_size);
 809                         memset(new_dyn + old_size, 0, pad_size);
 810
 811                         req->out.vector[i+2].iov_base = (void *)new_dyn;
 812                         req->out.vector[i+2].iov_len = new_size;
 813
 814                         TALLOC_FREE(old_dyn);
 815                 }
 816                 next_command_ofs += pad_size;
 817         }
 818
 819         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 820
 821         return smbd_smb2_request_reply(req);
 822 }
 823
 824 struct smbd_smb2_request_read_state {
 825         size_t missing;
 826         bool asked_for_header;
 827         struct smbd_smb2_request *smb2_req;
 828 };
 829
 830 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 831                                          void *private_data,
 832                                          TALLOC_CTX *mem_ctx,
 833                                          struct iovec **_vector,
 834                                          size_t *_count);
 835 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 836
 837 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 838                                         struct tevent_context *ev,
 839                                         struct smbd_server_connection *conn)
 840 {
 841         struct tevent_req *req;
 842         struct smbd_smb2_request_read_state *state;
 843         struct tevent_req *subreq;
 844         TALLOC_CTX *mem_pool;
 845
 846         req = tevent_req_create(mem_ctx, &state,
 847                                 struct smbd_smb2_request_read_state);
 848         if (req == NULL) {
 849                 return NULL;
 850         }
 851         state->missing = 0;
 852         state->asked_for_header = false;
 853
 854         mem_pool = talloc_pool(state, 8192);
 855         if (tevent_req_nomem(mem_pool, req)) {
 856                 return tevent_req_post(req, ev);
 857         }
 858
 859         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 860         if (tevent_req_nomem(state->smb2_req, req)) {
 861                 return tevent_req_post(req, ev);
 862         }
 863
 864         state->smb2_req->mem_pool       = mem_pool;
 865         state->smb2_req->conn           = conn;
 866
 867         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 868                                               conn->smb2.recv_queue,
 869                                               smbd_smb2_request_next_vector,
 870                                               state);
 871         if (tevent_req_nomem(subreq, req)) {
 872                 return tevent_req_post(req, ev);
 873         }
 874         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 875
 876         return req;
 877 }
 878
 879 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 880                                          void *private_data,
 881                                          TALLOC_CTX *mem_ctx,
 882                                          struct iovec **_vector,
 883                                          size_t *_count)
 884 {
 885         struct smbd_smb2_request_read_state *state =
 886                 talloc_get_type_abort(private_data,
 887                 struct smbd_smb2_request_read_state);
 888         struct smbd_smb2_request *req = state->smb2_req;
 889         struct iovec *vector;
 890         int idx = req->in.vector_count;
 891         size_t len = 0;
 892         uint8_t *buf = NULL;
 893
 894         if (req->in.vector_count == 0) {
 895                 /*
 896                  * first we need to get the NBT header
 897                  */
 898                 req->in.vector = talloc_array(req, struct iovec,
 899                                               req->in.vector_count + 1);
 900                 if (req->in.vector == NULL) {
 901                         return -1;
 902                 }
 903                 req->in.vector_count += 1;
 904
 905                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 906                 req->in.vector[idx].iov_len     = 4;
 907
 908                 vector = talloc_array(mem_ctx, struct iovec, 1);
 909                 if (vector == NULL) {
 910                         return -1;
 911                 }
 912
 913                 vector[0] = req->in.vector[idx];
 914
 915                 *_vector = vector;
 916                 *_count = 1;
 917                 return 0;
 918         }
 919
 920         if (req->in.vector_count == 1) {
 921                 /*
 922                  * Now we analyze the NBT header
 923                  */
 924                 state->missing = smb2_len(req->in.vector[0].iov_base);
 925
 926                 if (state->missing == 0) {
 927                         /* if there're no remaining bytes, we're done */
 928                         *_vector = NULL;
 929                         *_count = 0;
 930                         return 0;
 931                 }
 932
 933                 req->in.vector = talloc_realloc(req, req->in.vector,
 934                                                 struct iovec,
 935                                                 req->in.vector_count + 1);
 936                 if (req->in.vector == NULL) {
 937                         return -1;
 938                 }
 939                 req->in.vector_count += 1;
 940
 941                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 942                         /*
 943                          * it's a special NBT message,
 944                          * so get all remaining bytes
 945                          */
 946                         len = state->missing;
 947                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 948                         /*
 949                          * it's an invalid message, just read what we can get
 950                          * and let the caller handle the error
 951                          */
 952                         len = state->missing;
 953                 } else {
 954                         /*
 955                          * We assume it's a SMB2 request,
 956                          * and we first get the header and the
 957                          * first 2 bytes (the struct size) of the body
 958                          */
 959                         len = SMB2_HDR_BODY + 2;
 960
 961                         state->asked_for_header = true;
 962                 }
 963
 964                 state->missing -= len;
 965
 966                 buf = talloc_array(req->in.vector, uint8_t, len);
 967                 if (buf == NULL) {
 968                         return -1;
 969                 }
 970
 971                 req->in.vector[idx].iov_base    = (void *)buf;
 972                 req->in.vector[idx].iov_len     = len;
 973
 974                 vector = talloc_array(mem_ctx, struct iovec, 1);
 975                 if (vector == NULL) {
 976                         return -1;
 977                 }
 978
 979                 vector[0] = req->in.vector[idx];
 980
 981                 *_vector = vector;
 982                 *_count = 1;
 983                 return 0;
 984         }
 985
 986         if (state->missing == 0) {
 987                 /* if there're no remaining bytes, we're done */
 988                 *_vector = NULL;
 989                 *_count = 0;
 990                 return 0;
 991         }
 992
 993         if (state->asked_for_header) {
 994                 const uint8_t *hdr;
 995                 size_t full_size;
 996                 size_t next_command_ofs;
 997                 size_t body_size;
 998                 uint8_t *body;
 999                 size_t dyn_size;
1000                 uint8_t *dyn;
1001                 bool invalid = false;
1002
1003                 state->asked_for_header = false;
1004
1005                 /*
1006                  * We got the SMB2 header and the first 2 bytes
1007                  * of the body. We fix the size to just the header
1008                  * and manually copy the 2 first bytes to the body section
1009                  */
1010                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
1011                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
1012
1013                 /* allocate vectors for body and dynamic areas */
1014                 req->in.vector = talloc_realloc(req, req->in.vector,
1015                                                 struct iovec,
1016                                                 req->in.vector_count + 2);
1017                 if (req->in.vector == NULL) {
1018                         return -1;
1019                 }
1020                 req->in.vector_count += 2;
1021
1022                 full_size = state->missing + SMB2_HDR_BODY + 2;
1023                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
1024                 body_size = SVAL(hdr, SMB2_HDR_BODY);
1025
1026                 if (next_command_ofs != 0) {
1027                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
1028                                 /*
1029                                  * this is invalid, just return a zero
1030                                  * body and let the caller deal with the error
1031                                  */
1032                                 invalid = true;
1033                         } else if (next_command_ofs > full_size) {
1034                                 /*
1035                                  * this is invalid, just return a zero
1036                                  * body and let the caller deal with the error
1037                                  */
1038                                 invalid = true;
1039                         } else {
1040                                 full_size = next_command_ofs;
1041                         }
1042                 }
1043
1044                 if (!invalid) {
1045                         if (body_size < 2) {
1046                                 /*
1047                                  * this is invalid, just return a zero
1048                                  * body and let the caller deal with the error
1049                                  */
1050                                 invalid = true;
1051                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
1052                                 /*
1053                                  * this is invalid, just return a zero
1054                                  * body and let the caller deal with the error
1055                                  */
1056                                 invalid = true;
1057                         }
1058                 }
1059
1060                 if (invalid) {
1061                         /* the caller should check this */
1062                         body_size = 0;
1063                 }
1064
1065                 if ((body_size % 2) != 0) {
1066                         body_size -= 1;
1067                 }
1068
1069                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
1070
1071                 state->missing -= (body_size - 2) + dyn_size;
1072
1073                 body = talloc_array(req->in.vector, uint8_t, body_size);
1074                 if (body == NULL) {
1075                         return -1;
1076                 }
1077
1078                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
1079                 if (dyn == NULL) {
1080                         return -1;
1081                 }
1082
1083                 req->in.vector[idx].iov_base    = (void *)body;
1084                 req->in.vector[idx].iov_len     = body_size;
1085                 req->in.vector[idx+1].iov_base  = (void *)dyn;
1086                 req->in.vector[idx+1].iov_len   = dyn_size;
1087
1088                 vector = talloc_array(mem_ctx, struct iovec, 2);
1089                 if (vector == NULL) {
1090                         return -1;
1091                 }
1092
1093                 /*
1094                  * the first 2 bytes of the body were already fetched
1095                  * together with the header
1096                  */
1097                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
1098                 vector[0].iov_base = body + 2;
1099                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
1100
1101                 vector[1] = req->in.vector[idx+1];
1102
1103                 *_vector = vector;
1104                 *_count = 2;
1105                 return 0;
1106         }
1107
1108         /*
1109          * when we endup here, we're looking for a new SMB2 request
1110          * next. And we ask for its header and the first 2 bytes of
1111          * the body (like we did for the first SMB2 request).
1112          */
1113
1114         req->in.vector = talloc_realloc(req, req->in.vector,
1115                                         struct iovec,
1116                                         req->in.vector_count + 1);
1117         if (req->in.vector == NULL) {
1118                 return -1;
1119         }
1120         req->in.vector_count += 1;
1121
1122         /*
1123          * We assume it's a SMB2 request,
1124          * and we first get the header and the
1125          * first 2 bytes (the struct size) of the body
1126          */
1127         len = SMB2_HDR_BODY + 2;
1128
1129         if (len > state->missing) {
1130                 /* let the caller handle the error */
1131                 len = state->missing;
1132         }
1133
1134         state->missing -= len;
1135         state->asked_for_header = true;
1136
1137         buf = talloc_array(req->in.vector, uint8_t, len);
1138         if (buf == NULL) {
1139                 return -1;
1140         }
1141
1142         req->in.vector[idx].iov_base    = (void *)buf;
1143         req->in.vector[idx].iov_len     = len;
1144
1145         vector = talloc_array(mem_ctx, struct iovec, 1);
1146         if (vector == NULL) {
1147                 return -1;
1148         }
1149
1150         vector[0] = req->in.vector[idx];
1151
1152         *_vector = vector;
1153         *_count = 1;
1154         return 0;
1155 }
1156
1157 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1158 {
1159         struct tevent_req *req =
1160                 tevent_req_callback_data(subreq,
1161                 struct tevent_req);
1162         int ret;
1163         int sys_errno;
1164         NTSTATUS status;
1165
1166         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1167         if (ret == -1) {
1168                 status = map_nt_error_from_unix(sys_errno);
1169                 tevent_req_nterror(req, status);
1170                 return;
1171         }
1172
1173         tevent_req_done(req);
1174 }
1175
1176 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1177                                             TALLOC_CTX *mem_ctx,
1178                                             struct smbd_smb2_request **_smb2_req)
1179 {
1180         struct smbd_smb2_request_read_state *state =
1181                 tevent_req_data(req,
1182                 struct smbd_smb2_request_read_state);
1183         NTSTATUS status;
1184
1185         if (tevent_req_is_nterror(req, &status)) {
1186                 tevent_req_received(req);
1187                 return status;
1188         }
1189
1190         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1191         *_smb2_req = state->smb2_req;
1192         tevent_req_received(req);
1193         return NT_STATUS_OK;
1194 }
1195
1196 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1197
1198 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1199                              const uint8_t *inbuf, size_t size)
1200 {
1201         NTSTATUS status;
1202         struct smbd_smb2_request *req;
1203         struct tevent_req *subreq;
1204
1205         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1206                  (unsigned int)size));
1207
1208         status = smbd_initialize_smb2(conn);
1209         if (!NT_STATUS_IS_OK(status)) {
1210                 smbd_server_connection_terminate(conn, nt_errstr(status));
1211                 return;
1212         }
1213
1214         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1215         if (!NT_STATUS_IS_OK(status)) {
1216                 smbd_server_connection_terminate(conn, nt_errstr(status));
1217                 return;
1218         }
1219
1220         status = smbd_smb2_request_setup_out(req);
1221         if (!NT_STATUS_IS_OK(status)) {
1222                 smbd_server_connection_terminate(conn, nt_errstr(status));
1223                 return;
1224         }
1225
1226         status = smbd_smb2_request_dispatch(req);
1227         if (!NT_STATUS_IS_OK(status)) {
1228                 smbd_server_connection_terminate(conn, nt_errstr(status));
1229                 return;
1230         }
1231
1232         /* ask for the next request */
1233         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1234         if (subreq == NULL) {
1235                 smbd_server_connection_terminate(conn, "no memory for reading");
1236                 return;
1237         }
1238         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1239 }
1240
1241 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1242 {
1243         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1244                                               struct smbd_server_connection);
1245         NTSTATUS status;
1246         struct smbd_smb2_request *req;
1247
1248         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1249         TALLOC_FREE(subreq);
1250         if (!NT_STATUS_IS_OK(status)) {
1251                 smbd_server_connection_terminate(conn, nt_errstr(status));
1252                 return;
1253         }
1254
1255         if (req->in.nbt_hdr[0] != 0x00) {
1256                 DEBUG(1,("smbd_smb2_request_incoming: ignore NBT[0x%02X] msg\n",
1257                          req->in.nbt_hdr[0]));
1258                 talloc_free(req->mem_pool);
1259                 req = NULL;
1260                 goto next;
1261         }
1262
1263         req->current_idx = 1;
1264
1265         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1266                  req->current_idx, req->in.vector_count));
1267
1268         status = smbd_smb2_request_validate(req);
1269         if (!NT_STATUS_IS_OK(status)) {
1270                 smbd_server_connection_terminate(conn, nt_errstr(status));
1271                 return;
1272         }
1273
1274         status = smbd_smb2_request_setup_out(req);
1275         if (!NT_STATUS_IS_OK(status)) {
1276                 smbd_server_connection_terminate(conn, nt_errstr(status));
1277                 return;
1278         }
1279
1280         status = smbd_smb2_request_dispatch(req);
1281         if (!NT_STATUS_IS_OK(status)) {
1282                 smbd_server_connection_terminate(conn, nt_errstr(status));
1283                 return;
1284         }
1285
1286 next:
1287         /* ask for the next request (this constructs the main loop) */
1288         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1289         if (subreq == NULL) {
1290                 smbd_server_connection_terminate(conn, "no memory for reading");
1291                 return;
1292         }
1293         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1294 }