source3/smbd/smb2_server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23 #include "../source4/libcli/smb2/smb2_constants.h"
  24 #include "../lib/tsocket/tsocket.h"
  25
  26 bool smbd_is_smb2_header(const uint8_t *inbuf, size_t size)
  27 {
  28         if (size < (4 + SMB2_HDR_BODY)) {
  29                 return false;
  30         }
  31
  32         if (IVAL(inbuf, 4) != SMB2_MAGIC) {
  33                 return false;
  34         }
  35
  36         return true;
  37 }
  38
  39 static NTSTATUS smbd_initialize_smb2(struct smbd_server_connection *conn)
  40 {
  41         NTSTATUS status;
  42         int ret;
  43
  44         TALLOC_FREE(conn->fde);
  45
  46         conn->smb2.event_ctx = smbd_event_context();
  47
  48         conn->smb2.recv_queue = tevent_queue_create(conn, "smb2 recv queue");
  49         if (conn->smb2.recv_queue == NULL) {
  50                 return NT_STATUS_NO_MEMORY;
  51         }
  52
  53         conn->smb2.send_queue = tevent_queue_create(conn, "smb2 send queue");
  54         if (conn->smb2.send_queue == NULL) {
  55                 return NT_STATUS_NO_MEMORY;
  56         }
  57
  58         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  59                                           &conn->smb2.stream);
  60         if (ret == -1) {
  61                 status = map_nt_error_from_unix(errno);
  62                 return status;
  63         }
  64
  65         /* Ensure child is set to non-blocking mode */
  66         set_blocking(smbd_server_fd(),false);
  67         return NT_STATUS_OK;
  68 }
  69
  70 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  71 #define _smb2_setlen(_buf,len) do { \
  72         uint8_t *buf = (uint8_t *)_buf; \
  73         buf[0] = 0; \
  74         buf[1] = ((len)&0xFF0000)>>16; \
  75         buf[2] = ((len)&0xFF00)>>8; \
  76         buf[3] = (len)&0xFF; \
  77 } while (0)
  78
  79 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  80 {
  81         size_t len = 0;
  82         int i;
  83
  84         for (i=1; i < count; i++) {
  85                 len += vector[i].iov_len;
  86         }
  87
  88         _smb2_setlen(vector[0].iov_base, len);
  89 }
  90
  91 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
  92                                          const uint8_t *inbuf, size_t size,
  93                                          struct smbd_smb2_request **_req)
  94 {
  95         TALLOC_CTX *mem_pool;
  96         struct smbd_smb2_request *req;
  97         uint32_t protocol_version;
  98         const uint8_t *inhdr = NULL;
  99         off_t ofs = 0;
 100         uint16_t cmd;
 101         uint32_t next_command_ofs;
 102
 103         if (size < (4 + SMB2_HDR_BODY + 2)) {
 104                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 105                 return NT_STATUS_INVALID_PARAMETER;
 106         }
 107
 108         inhdr = inbuf + 4;
 109
 110         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 111         if (protocol_version != SMB2_MAGIC) {
 112                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 113                          protocol_version));
 114                 return NT_STATUS_INVALID_PARAMETER;
 115         }
 116
 117         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 118         if (cmd != SMB2_OP_NEGPROT) {
 119                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 120                          cmd));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 125         if (next_command_ofs != 0) {
 126                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 127                          next_command_ofs));
 128                 return NT_STATUS_INVALID_PARAMETER;
 129         }
 130
 131         mem_pool = talloc_pool(conn, 8192);
 132         if (mem_pool == NULL) {
 133                 return NT_STATUS_NO_MEMORY;
 134         }
 135
 136         req = talloc_zero(mem_pool, struct smbd_smb2_request);
 137         if (req == NULL) {
 138                 talloc_free(mem_pool);
 139                 return NT_STATUS_NO_MEMORY;
 140         }
 141         req->mem_pool   = mem_pool;
 142         req->conn       = conn;
 143
 144         talloc_steal(req, inbuf);
 145
 146         req->in.vector = talloc_array(req, struct iovec, 4);
 147         if (req->in.vector == NULL) {
 148                 talloc_free(mem_pool);
 149                 return NT_STATUS_NO_MEMORY;
 150         }
 151         req->in.vector_count = 4;
 152
 153         memcpy(req->in.nbt_hdr, inbuf, 4);
 154
 155         ofs = 0;
 156         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 157         req->in.vector[0].iov_len       = 4;
 158         ofs += req->in.vector[0].iov_len;
 159
 160         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 161         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 162         ofs += req->in.vector[1].iov_len;
 163
 164         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 165         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 166         ofs += req->in.vector[2].iov_len;
 167
 168         if (ofs > size) {
 169                 return NT_STATUS_INVALID_PARAMETER;
 170         }
 171
 172         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 173         req->in.vector[3].iov_len       = size - ofs;
 174         ofs += req->in.vector[3].iov_len;
 175
 176         req->current_idx = 1;
 177
 178         *_req = req;
 179         return NT_STATUS_OK;
 180 }
 181
 182 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 183 {
 184         struct iovec *vector;
 185         int count;
 186         int idx;
 187
 188         count = req->in.vector_count;
 189         vector = talloc_array(req, struct iovec, count);
 190         if (vector == NULL) {
 191                 return NT_STATUS_NO_MEMORY;
 192         }
 193
 194         vector[0].iov_base      = req->out.nbt_hdr;
 195         vector[0].iov_len       = 4;
 196         SIVAL(req->out.nbt_hdr, 0, 0);
 197
 198         for (idx=1; idx < count; idx += 3) {
 199                 const uint8_t *inhdr = NULL;
 200                 uint8_t *outhdr = NULL;
 201                 uint8_t *outbody = NULL;
 202                 uint8_t *outdyn = NULL;
 203                 size_t outdyn_size = 1;
 204                 uint32_t next_command_ofs = 0;
 205                 struct iovec *current = &vector[idx];
 206
 207                 if ((idx + 3) < count) {
 208                         /* we have a next command */
 209                         next_command_ofs = SMB2_HDR_BODY + 8 + 8;
 210                         outdyn_size = 8;
 211                 }
 212
 213                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 214
 215                 outhdr = talloc_array(vector, uint8_t,
 216                                       SMB2_HDR_BODY + 8 + outdyn_size);
 217                 if (outhdr == NULL) {
 218                         return NT_STATUS_NO_MEMORY;
 219                 }
 220
 221                 outbody = outhdr + SMB2_HDR_BODY;
 222                 outdyn = outbody + 8;
 223
 224                 current[0].iov_base     = (void *)outhdr;
 225                 current[0].iov_len      = SMB2_HDR_BODY;
 226
 227                 current[1].iov_base     = (void *)outbody;
 228                 current[1].iov_len      = 8;
 229
 230                 current[2].iov_base     = (void *)outdyn;
 231                 current[2].iov_len      = outdyn_size;
 232
 233                 /* setup the SMB2 header */
 234                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 235                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 236                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 237                 SIVAL(outhdr, SMB2_HDR_STATUS,
 238                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 239                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 240                       SVAL(inhdr, SMB2_HDR_OPCODE));
 241                 SSVAL(outhdr, SMB2_HDR_CREDIT,          0);
 242                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 243                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 244                 SIVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 245                       IVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 246                 SIVAL(outhdr, SMB2_HDR_PID,
 247                       IVAL(inhdr, SMB2_HDR_PID));
 248                 SIVAL(outhdr, SMB2_HDR_TID,
 249                       IVAL(inhdr, SMB2_HDR_TID));
 250                 SIVAL(outhdr, SMB2_HDR_SESSION_ID,
 251                       IVAL(inhdr, SMB2_HDR_SESSION_ID));
 252                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 253
 254                 /* setup error body header */
 255                 SSVAL(outbody, 0x00, 9);
 256                 SSVAL(outbody, 0x02, 0);
 257                 SIVAL(outbody, 0x04, 0);
 258
 259                 /* setup the dynamic part */
 260                 SCVAL(outdyn, 0x00, 0);
 261         }
 262
 263         req->out.vector = vector;
 264         req->out.vector_count = count;
 265
 266         /* setup the length of the NBT packet */
 267         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 268
 269         return NT_STATUS_OK;
 270 }
 271
 272 static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
 273                                              const char *reason)
 274 {
 275         DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
 276         exit_server_cleanly(reason);
 277 }
 278
 279 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 280 {
 281         const uint8_t *inhdr;
 282         int i = req->current_idx;
 283         uint16_t opcode;
 284
 285         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 286
 287         /* TODO: verify more things */
 288
 289         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 290         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 291         switch (opcode) {
 292         case SMB2_OP_NEGPROT:
 293                 return smbd_smb2_request_process_negprot(req);
 294
 295         case SMB2_OP_SESSSETUP:
 296                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 297
 298         case SMB2_OP_LOGOFF:
 299                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 300
 301                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 302         case SMB2_OP_TCON:
 303                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 304
 305                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 306         case SMB2_OP_TDIS:
 307                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 308
 309         case SMB2_OP_CREATE:
 310                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 311
 312         case SMB2_OP_CLOSE:
 313                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 314
 315         case SMB2_OP_FLUSH:
 316                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 317
 318         case SMB2_OP_READ:
 319                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 320
 321         case SMB2_OP_WRITE:
 322                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 323
 324         case SMB2_OP_LOCK:
 325                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 326
 327         case SMB2_OP_IOCTL:
 328                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 329
 330         case SMB2_OP_CANCEL:
 331                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 332
 333         case SMB2_OP_KEEPALIVE:
 334                 return smbd_smb2_request_process_keepalive(req);
 335
 336         case SMB2_OP_FIND:
 337                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 338
 339         case SMB2_OP_NOTIFY:
 340                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 341
 342         case SMB2_OP_GETINFO:
 343                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 344
 345         case SMB2_OP_SETINFO:
 346                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 347
 348         case SMB2_OP_BREAK:
 349                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 350         }
 351
 352         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 353 }
 354
 355 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 356 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 357
 358 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 359 {
 360         struct tevent_req *subreq;
 361
 362         /* TODO: sign the response here */
 363
 364         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 365
 366         req->current_idx += 3;
 367
 368         if (req->current_idx > req->in.vector_count) {
 369                 struct timeval zero = timeval_zero();
 370                 subreq = tevent_wakeup_send(req,
 371                                             req->conn->smb2.event_ctx,
 372                                             zero);
 373                 if (subreq == NULL) {
 374                         return NT_STATUS_NO_MEMORY;
 375                 }
 376                 tevent_req_set_callback(subreq,
 377                                         smbd_smb2_request_dispatch_compound,
 378                                         req);
 379
 380                 return NT_STATUS_OK;
 381         }
 382
 383         subreq = tstream_writev_queue_send(req,
 384                                            req->conn->smb2.event_ctx,
 385                                            req->conn->smb2.stream,
 386                                            req->conn->smb2.send_queue,
 387                                            req->out.vector,
 388                                            req->out.vector_count);
 389         if (subreq == NULL) {
 390                 return NT_STATUS_NO_MEMORY;
 391         }
 392         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 393
 394         return NT_STATUS_OK;
 395 }
 396
 397 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 398                                     NTSTATUS status,
 399                                     DATA_BLOB *info)
 400 {
 401         uint8_t *outhdr;
 402         uint8_t *outbody;
 403         int i = req->current_idx;
 404
 405         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
 406                   i, nt_errstr(status), info ? " +info" : ""));
 407
 408         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 409
 410         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 411
 412         outbody = outhdr + SMB2_HDR_BODY;
 413
 414         req->out.vector[i+1].iov_base = (void *)outbody;
 415         req->out.vector[i+1].iov_len = 8;
 416
 417         if (info) {
 418                 SIVAL(outbody, 0x04, info->length);
 419                 req->out.vector[i+2].iov_base   = (void *)info->data;
 420                 req->out.vector[i+2].iov_len    = info->length;
 421         } else {
 422                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 423                 req->out.vector[i+2].iov_len = 1;
 424         }
 425
 426         /* the error packet is the last response in the chain */
 427         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 428         req->out.vector_count = req->current_idx + 3;
 429
 430         return smbd_smb2_request_reply(req);
 431 }
 432
 433 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 434                                  NTSTATUS status)
 435 {
 436         return smbd_smb2_request_error_ex(req, status, NULL);
 437 }
 438
 439 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 440                                 DATA_BLOB body, DATA_BLOB *dyn)
 441 {
 442         uint8_t *outhdr;
 443         uint8_t *outdyn;
 444         int i = req->current_idx;
 445         uint32_t next_command_ofs;
 446
 447         DEBUG(10,("smbd_smb2_request_done: idx[%d] body[%u] dyn[%s:%u]\n",
 448                   i, (unsigned int)body.length,
 449                   dyn ? "yes": "no",
 450                   (unsigned int)(dyn ? dyn->length : 0)));
 451
 452         if (body.length < 2) {
 453                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 454         }
 455
 456         if ((body.length % 2) != 0) {
 457                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 458         }
 459
 460         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 461         /* the fallback dynamic buffer */
 462         outdyn = outhdr + SMB2_HDR_BODY + 8;
 463
 464         next_command_ofs = SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 465         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(NT_STATUS_OK));
 466
 467         req->out.vector[i+1].iov_base = (void *)body.data;
 468         req->out.vector[i+1].iov_len = body.length;
 469
 470         if (dyn) {
 471                 if (dyn->length > 0) {
 472                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 473                         req->out.vector[i+2].iov_len    = dyn->length;
 474                 } else {
 475                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 476                         req->out.vector[i+2].iov_len    = 1;
 477                 }
 478         } else {
 479                 req->out.vector[i+2].iov_base = NULL;
 480                 req->out.vector[i+2].iov_len = 0;
 481         }
 482
 483         /* see if we need to recalculate the offset to the next response */
 484         if (next_command_ofs > 0) {
 485                 next_command_ofs  = SMB2_HDR_BODY;
 486                 next_command_ofs += req->out.vector[i+1].iov_len;
 487                 next_command_ofs += req->out.vector[i+2].iov_len;
 488         }
 489
 490         /* TODO: we need to add padding ... */
 491         if ((next_command_ofs % 8) != 0) {
 492                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 493         }
 494
 495         /* the error packet is the last response in the chain */
 496         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 497
 498         return smbd_smb2_request_reply(req);
 499 }
 500
 501 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 502 {
 503         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 504                                         struct smbd_smb2_request);
 505         struct smbd_server_connection *conn = req->conn;
 506         NTSTATUS status;
 507
 508         tevent_wakeup_recv(subreq);
 509         TALLOC_FREE(subreq);
 510
 511         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 512                   req->current_idx, req->in.vector_count));
 513
 514         status = smbd_smb2_request_dispatch(req);
 515         if (!NT_STATUS_IS_OK(status)) {
 516                 smbd_server_connection_terminate(conn, nt_errstr(status));
 517                 return;
 518         }
 519 }
 520
 521 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 522 {
 523         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 524                                         struct smbd_smb2_request);
 525         struct smbd_server_connection *conn = req->conn;
 526         int ret;
 527         int sys_errno;
 528         TALLOC_CTX *mem_pool;
 529
 530         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 531         TALLOC_FREE(subreq);
 532         if (ret == -1) {
 533                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 534                 smbd_server_connection_terminate(conn, nt_errstr(status));
 535                 return;
 536         }
 537
 538         mem_pool = req->mem_pool;
 539         req = NULL;
 540         talloc_free(mem_pool);
 541 }
 542
 543 struct smbd_smb2_request_read_state {
 544         size_t missing;
 545         bool asked_for_header;
 546         struct smbd_smb2_request *smb2_req;
 547 };
 548
 549 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 550                                          void *private_data,
 551                                          TALLOC_CTX *mem_ctx,
 552                                          struct iovec **_vector,
 553                                          size_t *_count);
 554 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 555
 556 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 557                                         struct tevent_context *ev,
 558                                         struct smbd_server_connection *conn)
 559 {
 560         struct tevent_req *req;
 561         struct smbd_smb2_request_read_state *state;
 562         struct tevent_req *subreq;
 563         TALLOC_CTX *mem_pool;
 564
 565         req = tevent_req_create(mem_ctx, &state,
 566                                 struct smbd_smb2_request_read_state);
 567         if (req == NULL) {
 568                 return NULL;
 569         }
 570         state->missing = 0;
 571         state->asked_for_header = false;
 572
 573         mem_pool = talloc_pool(state, 8192);
 574         if (tevent_req_nomem(mem_pool, req)) {
 575                 return tevent_req_post(req, ev);
 576         }
 577
 578         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 579         if (tevent_req_nomem(state->smb2_req, req)) {
 580                 return tevent_req_post(req, ev);
 581         }
 582
 583         state->smb2_req->mem_pool       = mem_pool;
 584         state->smb2_req->conn           = conn;
 585
 586         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 587                                               conn->smb2.recv_queue,
 588                                               smbd_smb2_request_next_vector,
 589                                               state);
 590         if (tevent_req_nomem(subreq, req)) {
 591                 return tevent_req_post(req, ev);
 592         }
 593         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 594
 595         return req;
 596 }
 597
 598 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 599                                          void *private_data,
 600                                          TALLOC_CTX *mem_ctx,
 601                                          struct iovec **_vector,
 602                                          size_t *_count)
 603 {
 604         struct smbd_smb2_request_read_state *state =
 605                 talloc_get_type_abort(private_data,
 606                 struct smbd_smb2_request_read_state);
 607         struct smbd_smb2_request *req = state->smb2_req;
 608         struct iovec *vector;
 609         int idx = req->in.vector_count;
 610         size_t len = 0;
 611         uint8_t *buf = NULL;
 612
 613         if (req->in.vector_count == 0) {
 614                 /*
 615                  * first we need to get the NBT header
 616                  */
 617                 req->in.vector = talloc_array(req, struct iovec,
 618                                               req->in.vector_count + 1);
 619                 if (req->in.vector == NULL) {
 620                         return -1;
 621                 }
 622                 req->in.vector_count += 1;
 623
 624                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 625                 req->in.vector[idx].iov_len     = 4;
 626
 627                 vector = talloc_array(mem_ctx, struct iovec, 1);
 628                 if (vector == NULL) {
 629                         return -1;
 630                 }
 631
 632                 vector[0] = req->in.vector[idx];
 633
 634                 *_vector = vector;
 635                 *_count = 1;
 636                 return 0;
 637         }
 638
 639         if (req->in.vector_count == 1) {
 640                 /*
 641                  * Now we analyze the NBT header
 642                  */
 643                 state->missing = smb2_len(req->in.vector[0].iov_base);
 644
 645                 if (state->missing == 0) {
 646                         /* if there're no remaining bytes, we're done */
 647                         *_vector = NULL;
 648                         *_count = 0;
 649                         return 0;
 650                 }
 651
 652                 req->in.vector = talloc_realloc(req, req->in.vector,
 653                                                 struct iovec,
 654                                                 req->in.vector_count + 1);
 655                 if (req->in.vector == NULL) {
 656                         return -1;
 657                 }
 658                 req->in.vector_count += 1;
 659
 660                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 661                         /*
 662                          * it's a special NBT message,
 663                          * so get all remaining bytes
 664                          */
 665                         len = state->missing;
 666                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 667                         /*
 668                          * it's an invalid message, just read what we can get
 669                          * and let the caller handle the error
 670                          */
 671                         len = state->missing;
 672                 } else {
 673                         /*
 674                          * We assume it's a SMB2 request,
 675                          * and we first get the header and the
 676                          * first 2 bytes (the struct size) of the body
 677                          */
 678                         len = SMB2_HDR_BODY + 2;
 679
 680                         state->asked_for_header = true;
 681                 }
 682
 683                 state->missing -= len;
 684
 685                 buf = talloc_array(req->in.vector, uint8_t, len);
 686                 if (buf == NULL) {
 687                         return -1;
 688                 }
 689
 690                 req->in.vector[idx].iov_base    = (void *)buf;
 691                 req->in.vector[idx].iov_len     = len;
 692
 693                 vector = talloc_array(mem_ctx, struct iovec, 1);
 694                 if (vector == NULL) {
 695                         return -1;
 696                 }
 697
 698                 vector[0] = req->in.vector[idx];
 699
 700                 *_vector = vector;
 701                 *_count = 1;
 702                 return 0;
 703         }
 704
 705         if (state->missing == 0) {
 706                 /* if there're no remaining bytes, we're done */
 707                 *_vector = NULL;
 708                 *_count = 0;
 709                 return 0;
 710         }
 711
 712         if (state->asked_for_header) {
 713                 const uint8_t *hdr;
 714                 size_t full_size;
 715                 size_t next_command_ofs;
 716                 size_t body_size;
 717                 uint8_t *body;
 718                 size_t dyn_size;
 719                 uint8_t *dyn;
 720                 bool invalid = false;
 721
 722                 state->asked_for_header = false;
 723
 724                 /*
 725                  * We got the SMB2 header and the first 2 bytes
 726                  * of the body. We fix the size to just the header
 727                  * and manually copy the 2 first bytes to the body section
 728                  */
 729                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 730                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 731
 732                 /* allocate vectors for body and dynamic areas */
 733                 req->in.vector = talloc_realloc(req, req->in.vector,
 734                                                 struct iovec,
 735                                                 req->in.vector_count + 2);
 736                 if (req->in.vector == NULL) {
 737                         return -1;
 738                 }
 739                 req->in.vector_count += 2;
 740
 741                 full_size = state->missing + SMB2_HDR_BODY + 2;
 742                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 743                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 744
 745                 if (next_command_ofs != 0) {
 746                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 747                                 /*
 748                                  * this is invalid, just return a zero
 749                                  * body and let the caller deal with the error
 750                                  */
 751                                 invalid = true;
 752                         } else if (next_command_ofs > full_size) {
 753                                 /*
 754                                  * this is invalid, just return a zero
 755                                  * body and let the caller deal with the error
 756                                  */
 757                                 invalid = true;
 758                         } else {
 759                                 full_size = next_command_ofs;
 760                         }
 761                 }
 762
 763                 if (!invalid) {
 764                         if (body_size < 2) {
 765                                 /*
 766                                  * this is invalid, just return a zero
 767                                  * body and let the caller deal with the error
 768                                  */
 769                                 invalid = true;
 770                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 771                                 /*
 772                                  * this is invalid, just return a zero
 773                                  * body and let the caller deal with the error
 774                                  */
 775                                 invalid = true;
 776                         }
 777                 }
 778
 779                 if (invalid) {
 780                         /* the caller should check this */
 781                         body_size = 0;
 782                 }
 783
 784                 if ((body_size % 2) != 0) {
 785                         body_size -= 1;
 786                 }
 787
 788                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 789
 790                 state->missing -= (body_size - 2) + dyn_size;
 791
 792                 body = talloc_array(req->in.vector, uint8_t, body_size);
 793                 if (body == NULL) {
 794                         return -1;
 795                 }
 796
 797                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 798                 if (dyn == NULL) {
 799                         return -1;
 800                 }
 801
 802                 req->in.vector[idx].iov_base    = (void *)body;
 803                 req->in.vector[idx].iov_len     = body_size;
 804                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 805                 req->in.vector[idx+1].iov_len   = dyn_size;
 806
 807                 vector = talloc_array(mem_ctx, struct iovec, 2);
 808                 if (vector == NULL) {
 809                         return -1;
 810                 }
 811
 812                 /*
 813                  * the first 2 bytes of the body were already fetched
 814                  * together with the header
 815                  */
 816                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 817                 vector[0].iov_base = body + 2;
 818                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 819
 820                 vector[1] = req->in.vector[idx+1];
 821
 822                 *_vector = vector;
 823                 *_count = 2;
 824                 return 0;
 825         }
 826
 827         /*
 828          * when we endup here, we're looking for a new SMB2 request
 829          * next. And we ask for its header and the first 2 bytes of
 830          * the body (like we did for the first SMB2 request).
 831          */
 832
 833         req->in.vector = talloc_realloc(req, req->in.vector,
 834                                         struct iovec,
 835                                         req->in.vector_count + 1);
 836         if (req->in.vector == NULL) {
 837                 return -1;
 838         }
 839         req->in.vector_count += 1;
 840
 841         /*
 842          * We assume it's a SMB2 request,
 843          * and we first get the header and the
 844          * first 2 bytes (the struct size) of the body
 845          */
 846         len = SMB2_HDR_BODY + 2;
 847
 848         if (len > state->missing) {
 849                 /* let the caller handle the error */
 850                 len = state->missing;
 851         }
 852
 853         state->missing -= len;
 854         state->asked_for_header = true;
 855
 856         buf = talloc_array(req->in.vector, uint8_t, len);
 857         if (buf == NULL) {
 858                 return -1;
 859         }
 860
 861         req->in.vector[idx].iov_base    = (void *)buf;
 862         req->in.vector[idx].iov_len     = len;
 863
 864         vector = talloc_array(mem_ctx, struct iovec, 1);
 865         if (vector == NULL) {
 866                 return -1;
 867         }
 868
 869         vector[0] = req->in.vector[idx];
 870
 871         *_vector = vector;
 872         *_count = 1;
 873         return 0;
 874 }
 875
 876 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
 877 {
 878         struct tevent_req *req =
 879                 tevent_req_callback_data(subreq,
 880                 struct tevent_req);
 881         int ret;
 882         int sys_errno;
 883         NTSTATUS status;
 884
 885         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
 886         if (ret == -1) {
 887                 status = map_nt_error_from_unix(sys_errno);
 888                 tevent_req_nterror(req, status);
 889                 return;
 890         }
 891
 892         tevent_req_done(req);
 893 }
 894
 895 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
 896                                             TALLOC_CTX *mem_ctx,
 897                                             struct smbd_smb2_request **_smb2_req)
 898 {
 899         struct smbd_smb2_request_read_state *state =
 900                 tevent_req_data(req,
 901                 struct smbd_smb2_request_read_state);
 902         NTSTATUS status;
 903
 904         if (tevent_req_is_nterror(req, &status)) {
 905                 tevent_req_received(req);
 906                 return status;
 907         }
 908
 909         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
 910         *_smb2_req = state->smb2_req;
 911         tevent_req_received(req);
 912         return NT_STATUS_OK;
 913 }
 914
 915 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
 916
 917 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
 918                              const uint8_t *inbuf, size_t size)
 919 {
 920         NTSTATUS status;
 921         struct smbd_smb2_request *req;
 922         struct tevent_req *subreq;
 923
 924         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
 925                  (unsigned int)size));
 926
 927         status = smbd_initialize_smb2(conn);
 928         if (!NT_STATUS_IS_OK(status)) {
 929                 smbd_server_connection_terminate(conn, nt_errstr(status));
 930                 return;
 931         }
 932
 933         status = smbd_smb2_request_create(conn, inbuf, size, &req);
 934         if (!NT_STATUS_IS_OK(status)) {
 935                 smbd_server_connection_terminate(conn, nt_errstr(status));
 936                 return;
 937         }
 938
 939         status = smbd_smb2_request_setup_out(req);
 940         if (!NT_STATUS_IS_OK(status)) {
 941                 smbd_server_connection_terminate(conn, nt_errstr(status));
 942                 return;
 943         }
 944
 945         status = smbd_smb2_request_dispatch(req);
 946         if (!NT_STATUS_IS_OK(status)) {
 947                 smbd_server_connection_terminate(conn, nt_errstr(status));
 948                 return;
 949         }
 950
 951         /* ask for the next request */
 952         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
 953         if (subreq == NULL) {
 954                 smbd_server_connection_terminate(conn, "no memory for reading");
 955                 return;
 956         }
 957         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
 958 }
 959
 960 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
 961 {
 962         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
 963                                               struct smbd_server_connection);
 964         NTSTATUS status;
 965         struct smbd_smb2_request *req;
 966
 967         status = smbd_smb2_request_read_recv(subreq, conn, &req);
 968         TALLOC_FREE(subreq);
 969         if (!NT_STATUS_IS_OK(status)) {
 970                 smbd_server_connection_terminate(conn, nt_errstr(status));
 971                 return;
 972         }
 973
 974         /* TODO: validate the incoming request */
 975         req->current_idx = 1;
 976
 977         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
 978                  req->current_idx, req->in.vector_count));
 979
 980         status = smbd_smb2_request_setup_out(req);
 981         if (!NT_STATUS_IS_OK(status)) {
 982                 smbd_server_connection_terminate(conn, nt_errstr(status));
 983                 return;
 984         }
 985
 986         status = smbd_smb2_request_dispatch(req);
 987         if (!NT_STATUS_IS_OK(status)) {
 988                 smbd_server_connection_terminate(conn, nt_errstr(status));
 989                 return;
 990         }
 991
 992         /* ask for the next request (this constructs the main loop) */
 993         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
 994         if (subreq == NULL) {
 995                 smbd_server_connection_terminate(conn, "no memory for reading");
 996                 return;
 997         }
 998         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
 999 }