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 = 0x00FFFFFF;
  63         conn->smb2.sessions.list = NULL;
  64
  65         ret = tstream_bsd_existing_socket(conn, smbd_server_fd(),
  66                                           &conn->smb2.stream);
  67         if (ret == -1) {
  68                 status = map_nt_error_from_unix(errno);
  69                 return status;
  70         }
  71
  72         /* Ensure child is set to non-blocking mode */
  73         set_blocking(smbd_server_fd(),false);
  74         return NT_STATUS_OK;
  75 }
  76
  77 #define smb2_len(buf) (PVAL(buf,3)|(PVAL(buf,2)<<8)|(PVAL(buf,1)<<16))
  78 #define _smb2_setlen(_buf,len) do { \
  79         uint8_t *buf = (uint8_t *)_buf; \
  80         buf[0] = 0; \
  81         buf[1] = ((len)&0xFF0000)>>16; \
  82         buf[2] = ((len)&0xFF00)>>8; \
  83         buf[3] = (len)&0xFF; \
  84 } while (0)
  85
  86 static void smb2_setup_nbt_length(struct iovec *vector, int count)
  87 {
  88         size_t len = 0;
  89         int i;
  90
  91         for (i=1; i < count; i++) {
  92                 len += vector[i].iov_len;
  93         }
  94
  95         _smb2_setlen(vector[0].iov_base, len);
  96 }
  97
  98 static NTSTATUS smbd_smb2_request_create(struct smbd_server_connection *conn,
  99                                          const uint8_t *inbuf, size_t size,
 100                                          struct smbd_smb2_request **_req)
 101 {
 102         TALLOC_CTX *mem_pool;
 103         struct smbd_smb2_request *req;
 104         uint32_t protocol_version;
 105         const uint8_t *inhdr = NULL;
 106         off_t ofs = 0;
 107         uint16_t cmd;
 108         uint32_t next_command_ofs;
 109
 110         if (size < (4 + SMB2_HDR_BODY + 2)) {
 111                 DEBUG(0,("Invalid SMB2 packet length count %ld\n", (long)size));
 112                 return NT_STATUS_INVALID_PARAMETER;
 113         }
 114
 115         inhdr = inbuf + 4;
 116
 117         protocol_version = IVAL(inhdr, SMB2_HDR_PROTOCOL_ID);
 118         if (protocol_version != SMB2_MAGIC) {
 119                 DEBUG(0,("Invalid SMB packet: protocol prefix: 0x%08X\n",
 120                          protocol_version));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         cmd = SVAL(inhdr, SMB2_HDR_OPCODE);
 125         if (cmd != SMB2_OP_NEGPROT) {
 126                 DEBUG(0,("Invalid SMB packet: first request: 0x%04X\n",
 127                          cmd));
 128                 return NT_STATUS_INVALID_PARAMETER;
 129         }
 130
 131         next_command_ofs = IVAL(inhdr, SMB2_HDR_NEXT_COMMAND);
 132         if (next_command_ofs != 0) {
 133                 DEBUG(0,("Invalid SMB packet: next_command: 0x%08X\n",
 134                          next_command_ofs));
 135                 return NT_STATUS_INVALID_PARAMETER;
 136         }
 137
 138         mem_pool = talloc_pool(conn, 8192);
 139         if (mem_pool == NULL) {
 140                 return NT_STATUS_NO_MEMORY;
 141         }
 142
 143         req = talloc_zero(mem_pool, struct smbd_smb2_request);
 144         if (req == NULL) {
 145                 talloc_free(mem_pool);
 146                 return NT_STATUS_NO_MEMORY;
 147         }
 148         req->mem_pool   = mem_pool;
 149         req->conn       = conn;
 150
 151         talloc_steal(req, inbuf);
 152
 153         req->in.vector = talloc_array(req, struct iovec, 4);
 154         if (req->in.vector == NULL) {
 155                 talloc_free(mem_pool);
 156                 return NT_STATUS_NO_MEMORY;
 157         }
 158         req->in.vector_count = 4;
 159
 160         memcpy(req->in.nbt_hdr, inbuf, 4);
 161
 162         ofs = 0;
 163         req->in.vector[0].iov_base      = (void *)req->in.nbt_hdr;
 164         req->in.vector[0].iov_len       = 4;
 165         ofs += req->in.vector[0].iov_len;
 166
 167         req->in.vector[1].iov_base      = (void *)(inbuf + ofs);
 168         req->in.vector[1].iov_len       = SMB2_HDR_BODY;
 169         ofs += req->in.vector[1].iov_len;
 170
 171         req->in.vector[2].iov_base      = (void *)(inbuf + ofs);
 172         req->in.vector[2].iov_len       = SVAL(inbuf, ofs) & 0xFFFE;
 173         ofs += req->in.vector[2].iov_len;
 174
 175         if (ofs > size) {
 176                 return NT_STATUS_INVALID_PARAMETER;
 177         }
 178
 179         req->in.vector[3].iov_base      = (void *)(inbuf + ofs);
 180         req->in.vector[3].iov_len       = size - ofs;
 181         ofs += req->in.vector[3].iov_len;
 182
 183         req->current_idx = 1;
 184
 185         *_req = req;
 186         return NT_STATUS_OK;
 187 }
 188
 189 static NTSTATUS smbd_smb2_request_setup_out(struct smbd_smb2_request *req)
 190 {
 191         struct iovec *vector;
 192         int count;
 193         int idx;
 194
 195         count = req->in.vector_count;
 196         vector = talloc_array(req, struct iovec, count);
 197         if (vector == NULL) {
 198                 return NT_STATUS_NO_MEMORY;
 199         }
 200
 201         vector[0].iov_base      = req->out.nbt_hdr;
 202         vector[0].iov_len       = 4;
 203         SIVAL(req->out.nbt_hdr, 0, 0);
 204
 205         for (idx=1; idx < count; idx += 3) {
 206                 const uint8_t *inhdr = NULL;
 207                 uint8_t *outhdr = NULL;
 208                 uint8_t *outbody = NULL;
 209                 uint8_t *outdyn = NULL;
 210                 size_t outdyn_size = 1;
 211                 uint32_t next_command_ofs = 0;
 212                 struct iovec *current = &vector[idx];
 213
 214                 if ((idx + 3) < count) {
 215                         /* we have a next command */
 216                         next_command_ofs = SMB2_HDR_BODY + 8 + 8;
 217                         outdyn_size = 8;
 218                 }
 219
 220                 inhdr = (const uint8_t *)req->in.vector[idx].iov_base;
 221
 222                 outhdr = talloc_array(vector, uint8_t,
 223                                       SMB2_HDR_BODY + 8 + outdyn_size);
 224                 if (outhdr == NULL) {
 225                         return NT_STATUS_NO_MEMORY;
 226                 }
 227
 228                 outbody = outhdr + SMB2_HDR_BODY;
 229                 outdyn = outbody + 8;
 230
 231                 current[0].iov_base     = (void *)outhdr;
 232                 current[0].iov_len      = SMB2_HDR_BODY;
 233
 234                 current[1].iov_base     = (void *)outbody;
 235                 current[1].iov_len      = 8;
 236
 237                 current[2].iov_base     = (void *)outdyn;
 238                 current[2].iov_len      = outdyn_size;
 239
 240                 /* setup the SMB2 header */
 241                 SIVAL(outhdr, SMB2_HDR_PROTOCOL_ID,     SMB2_MAGIC);
 242                 SSVAL(outhdr, SMB2_HDR_LENGTH,          SMB2_HDR_BODY);
 243                 SSVAL(outhdr, SMB2_HDR_EPOCH,           0);
 244                 SIVAL(outhdr, SMB2_HDR_STATUS,
 245                       NT_STATUS_V(NT_STATUS_INTERNAL_ERROR));
 246                 SSVAL(outhdr, SMB2_HDR_OPCODE,
 247                       SVAL(inhdr, SMB2_HDR_OPCODE));
 248                 SSVAL(outhdr, SMB2_HDR_CREDIT,          0);
 249                 SIVAL(outhdr, SMB2_HDR_FLAGS,           SMB2_HDR_FLAG_REDIRECT);
 250                 SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND,    next_command_ofs);
 251                 SBVAL(outhdr, SMB2_HDR_MESSAGE_ID,
 252                       BVAL(inhdr, SMB2_HDR_MESSAGE_ID));
 253                 SIVAL(outhdr, SMB2_HDR_PID,
 254                       IVAL(inhdr, SMB2_HDR_PID));
 255                 SIVAL(outhdr, SMB2_HDR_TID,
 256                       IVAL(inhdr, SMB2_HDR_TID));
 257                 SBVAL(outhdr, SMB2_HDR_SESSION_ID,
 258                       BVAL(inhdr, SMB2_HDR_SESSION_ID));
 259                 memset(outhdr + SMB2_HDR_SIGNATURE, 0, 16);
 260
 261                 /* setup error body header */
 262                 SSVAL(outbody, 0x00, 9);
 263                 SSVAL(outbody, 0x02, 0);
 264                 SIVAL(outbody, 0x04, 0);
 265
 266                 /* setup the dynamic part */
 267                 SCVAL(outdyn, 0x00, 0);
 268         }
 269
 270         req->out.vector = vector;
 271         req->out.vector_count = count;
 272
 273         /* setup the length of the NBT packet */
 274         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279 static void smbd_server_connection_terminate(struct smbd_server_connection *conn,
 280                                              const char *reason)
 281 {
 282         DEBUG(10,("smbd_server_connection_terminate: reason[%s]\n", reason));
 283         exit_server_cleanly(reason);
 284 }
 285
 286 static NTSTATUS smbd_smb2_request_dispatch(struct smbd_smb2_request *req)
 287 {
 288         const uint8_t *inhdr;
 289         int i = req->current_idx;
 290         uint16_t opcode;
 291         uint32_t flags;
 292         NTSTATUS status;
 293         NTSTATUS session_status;
 294
 295         inhdr = (const uint8_t *)req->in.vector[i].iov_base;
 296
 297         /* TODO: verify more things */
 298
 299         flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 300         opcode = IVAL(inhdr, SMB2_HDR_OPCODE);
 301         DEBUG(10,("smbd_smb2_request_dispatch: opcode[%u]\n", opcode));
 302
 303 #define TMP_SMB2_ALLOWED_FLAGS ( \
 304         SMB2_HDR_FLAG_CHAINED | \
 305         SMB2_HDR_FLAG_SIGNED | \
 306         SMB2_HDR_FLAG_DFS)
 307         if ((flags & ~TMP_SMB2_ALLOWED_FLAGS) != 0) {
 308                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 309         }
 310 #undef TMP_SMB2_ALLOWED_FLAGS
 311
 312         session_status = smbd_smb2_request_check_session(req);
 313
 314         req->do_signing = false;
 315         if (flags & SMB2_HDR_FLAG_SIGNED) {
 316                 if (!NT_STATUS_IS_OK(session_status)) {
 317                         return smbd_smb2_request_error(req, session_status);
 318                 }
 319
 320                 req->do_signing = true;
 321                 status = smb2_signing_check_pdu(req->session->session_key,
 322                                                 &req->in.vector[i], 3);
 323                 if (!NT_STATUS_IS_OK(status)) {
 324                         return smbd_smb2_request_error(req, status);
 325                 }
 326         } else if (req->session && req->session->do_signing) {
 327                 return smbd_smb2_request_error(req, NT_STATUS_ACCESS_DENIED);
 328         }
 329
 330         switch (opcode) {
 331         case SMB2_OP_NEGPROT:
 332                 return smbd_smb2_request_process_negprot(req);
 333
 334         case SMB2_OP_SESSSETUP:
 335                 return smbd_smb2_request_process_sesssetup(req);
 336
 337         case SMB2_OP_LOGOFF:
 338                 if (!NT_STATUS_IS_OK(session_status)) {
 339                         return smbd_smb2_request_error(req, session_status);
 340                 }
 341                 return smbd_smb2_request_process_logoff(req);
 342
 343         case SMB2_OP_TCON:
 344                 if (!NT_STATUS_IS_OK(session_status)) {
 345                         return smbd_smb2_request_error(req, session_status);
 346                 }
 347                 status = smbd_smb2_request_check_session(req);
 348                 if (!NT_STATUS_IS_OK(status)) {
 349                         return smbd_smb2_request_error(req, status);
 350                 }
 351                 return smbd_smb2_request_process_tcon(req);
 352
 353         case SMB2_OP_TDIS:
 354                 if (!NT_STATUS_IS_OK(session_status)) {
 355                         return smbd_smb2_request_error(req, session_status);
 356                 }
 357                 status = smbd_smb2_request_check_tcon(req);
 358                 if (!NT_STATUS_IS_OK(status)) {
 359                         return smbd_smb2_request_error(req, status);
 360                 }
 361                 return smbd_smb2_request_process_tdis(req);
 362
 363         case SMB2_OP_CREATE:
 364                 if (!NT_STATUS_IS_OK(session_status)) {
 365                         return smbd_smb2_request_error(req, session_status);
 366                 }
 367                 status = smbd_smb2_request_check_tcon(req);
 368                 if (!NT_STATUS_IS_OK(status)) {
 369                         return smbd_smb2_request_error(req, status);
 370                 }
 371                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 372
 373         case SMB2_OP_CLOSE:
 374                 if (!NT_STATUS_IS_OK(session_status)) {
 375                         return smbd_smb2_request_error(req, session_status);
 376                 }
 377                 status = smbd_smb2_request_check_tcon(req);
 378                 if (!NT_STATUS_IS_OK(status)) {
 379                         return smbd_smb2_request_error(req, status);
 380                 }
 381                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 382
 383         case SMB2_OP_FLUSH:
 384                 if (!NT_STATUS_IS_OK(session_status)) {
 385                         return smbd_smb2_request_error(req, session_status);
 386                 }
 387                 status = smbd_smb2_request_check_tcon(req);
 388                 if (!NT_STATUS_IS_OK(status)) {
 389                         return smbd_smb2_request_error(req, status);
 390                 }
 391                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 392
 393         case SMB2_OP_READ:
 394                 if (!NT_STATUS_IS_OK(session_status)) {
 395                         return smbd_smb2_request_error(req, session_status);
 396                 }
 397                 status = smbd_smb2_request_check_tcon(req);
 398                 if (!NT_STATUS_IS_OK(status)) {
 399                         return smbd_smb2_request_error(req, status);
 400                 }
 401                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 402
 403         case SMB2_OP_WRITE:
 404                 if (!NT_STATUS_IS_OK(session_status)) {
 405                         return smbd_smb2_request_error(req, session_status);
 406                 }
 407                 status = smbd_smb2_request_check_tcon(req);
 408                 if (!NT_STATUS_IS_OK(status)) {
 409                         return smbd_smb2_request_error(req, status);
 410                 }
 411                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 412
 413         case SMB2_OP_LOCK:
 414                 if (!NT_STATUS_IS_OK(session_status)) {
 415                         return smbd_smb2_request_error(req, session_status);
 416                 }
 417                 status = smbd_smb2_request_check_tcon(req);
 418                 if (!NT_STATUS_IS_OK(status)) {
 419                         return smbd_smb2_request_error(req, status);
 420                 }
 421                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 422
 423         case SMB2_OP_IOCTL:
 424                 if (!NT_STATUS_IS_OK(session_status)) {
 425                         return smbd_smb2_request_error(req, session_status);
 426                 }
 427                 status = smbd_smb2_request_check_tcon(req);
 428                 if (!NT_STATUS_IS_OK(status)) {
 429                         return smbd_smb2_request_error(req, status);
 430                 }
 431                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 432
 433         case SMB2_OP_CANCEL:
 434                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 435
 436         case SMB2_OP_KEEPALIVE:
 437                 return smbd_smb2_request_process_keepalive(req);
 438
 439         case SMB2_OP_FIND:
 440                 if (!NT_STATUS_IS_OK(session_status)) {
 441                         return smbd_smb2_request_error(req, session_status);
 442                 }
 443                 status = smbd_smb2_request_check_tcon(req);
 444                 if (!NT_STATUS_IS_OK(status)) {
 445                         return smbd_smb2_request_error(req, status);
 446                 }
 447                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 448
 449         case SMB2_OP_NOTIFY:
 450                 if (!NT_STATUS_IS_OK(session_status)) {
 451                         return smbd_smb2_request_error(req, session_status);
 452                 }
 453                 status = smbd_smb2_request_check_tcon(req);
 454                 if (!NT_STATUS_IS_OK(status)) {
 455                         return smbd_smb2_request_error(req, status);
 456                 }
 457                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 458
 459         case SMB2_OP_GETINFO:
 460                 if (!NT_STATUS_IS_OK(session_status)) {
 461                         return smbd_smb2_request_error(req, session_status);
 462                 }
 463                 status = smbd_smb2_request_check_tcon(req);
 464                 if (!NT_STATUS_IS_OK(status)) {
 465                         return smbd_smb2_request_error(req, status);
 466                 }
 467                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 468
 469         case SMB2_OP_SETINFO:
 470                 if (!NT_STATUS_IS_OK(session_status)) {
 471                         return smbd_smb2_request_error(req, session_status);
 472                 }
 473                 status = smbd_smb2_request_check_tcon(req);
 474                 if (!NT_STATUS_IS_OK(status)) {
 475                         return smbd_smb2_request_error(req, status);
 476                 }
 477                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 478
 479         case SMB2_OP_BREAK:
 480                 if (!NT_STATUS_IS_OK(session_status)) {
 481                         return smbd_smb2_request_error(req, session_status);
 482                 }
 483                 status = smbd_smb2_request_check_tcon(req);
 484                 if (!NT_STATUS_IS_OK(status)) {
 485                         return smbd_smb2_request_error(req, status);
 486                 }
 487                 return smbd_smb2_request_error(req, NT_STATUS_NOT_IMPLEMENTED);
 488         }
 489
 490         return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 491 }
 492
 493 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq);
 494 static void smbd_smb2_request_writev_done(struct tevent_req *subreq);
 495
 496 static NTSTATUS smbd_smb2_request_reply(struct smbd_smb2_request *req)
 497 {
 498         struct tevent_req *subreq;
 499
 500         smb2_setup_nbt_length(req->out.vector, req->out.vector_count);
 501
 502         if (req->do_signing) {
 503                 int i = req->current_idx;
 504                 NTSTATUS status;
 505                 status = smb2_signing_sign_pdu(req->session->session_key,
 506                                                &req->out.vector[i], 3);
 507                 if (!NT_STATUS_IS_OK(status)) {
 508                         return status;
 509                 }
 510         }
 511
 512         req->current_idx += 3;
 513
 514         if (req->current_idx > req->in.vector_count) {
 515                 struct timeval zero = timeval_zero();
 516                 subreq = tevent_wakeup_send(req,
 517                                             req->conn->smb2.event_ctx,
 518                                             zero);
 519                 if (subreq == NULL) {
 520                         return NT_STATUS_NO_MEMORY;
 521                 }
 522                 tevent_req_set_callback(subreq,
 523                                         smbd_smb2_request_dispatch_compound,
 524                                         req);
 525
 526                 return NT_STATUS_OK;
 527         }
 528
 529         subreq = tstream_writev_queue_send(req,
 530                                            req->conn->smb2.event_ctx,
 531                                            req->conn->smb2.stream,
 532                                            req->conn->smb2.send_queue,
 533                                            req->out.vector,
 534                                            req->out.vector_count);
 535         if (subreq == NULL) {
 536                 return NT_STATUS_NO_MEMORY;
 537         }
 538         tevent_req_set_callback(subreq, smbd_smb2_request_writev_done, req);
 539
 540         return NT_STATUS_OK;
 541 }
 542
 543 static void smbd_smb2_request_dispatch_compound(struct tevent_req *subreq)
 544 {
 545         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 546                                         struct smbd_smb2_request);
 547         struct smbd_server_connection *conn = req->conn;
 548         NTSTATUS status;
 549
 550         tevent_wakeup_recv(subreq);
 551         TALLOC_FREE(subreq);
 552
 553         DEBUG(10,("smbd_smb2_request_dispatch_compound: idx[%d] of %d vectors\n",
 554                   req->current_idx, req->in.vector_count));
 555
 556         status = smbd_smb2_request_dispatch(req);
 557         if (!NT_STATUS_IS_OK(status)) {
 558                 smbd_server_connection_terminate(conn, nt_errstr(status));
 559                 return;
 560         }
 561 }
 562
 563 static void smbd_smb2_request_writev_done(struct tevent_req *subreq)
 564 {
 565         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
 566                                         struct smbd_smb2_request);
 567         struct smbd_server_connection *conn = req->conn;
 568         int ret;
 569         int sys_errno;
 570         TALLOC_CTX *mem_pool;
 571
 572         ret = tstream_writev_queue_recv(subreq, &sys_errno);
 573         TALLOC_FREE(subreq);
 574         if (ret == -1) {
 575                 NTSTATUS status = map_nt_error_from_unix(sys_errno);
 576                 smbd_server_connection_terminate(conn, nt_errstr(status));
 577                 return;
 578         }
 579
 580         mem_pool = req->mem_pool;
 581         req = NULL;
 582         talloc_free(mem_pool);
 583 }
 584
 585 NTSTATUS smbd_smb2_request_error_ex(struct smbd_smb2_request *req,
 586                                     NTSTATUS status,
 587                                     DATA_BLOB *info)
 588 {
 589         uint8_t *outhdr;
 590         uint8_t *outbody;
 591         int i = req->current_idx;
 592
 593         DEBUG(10,("smbd_smb2_request_error_ex: idx[%d] status[%s]%s\n",
 594                   i, nt_errstr(status), info ? " +info" : ""));
 595
 596         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 597
 598         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 599
 600         outbody = outhdr + SMB2_HDR_BODY;
 601
 602         req->out.vector[i+1].iov_base = (void *)outbody;
 603         req->out.vector[i+1].iov_len = 8;
 604
 605         if (info) {
 606                 SIVAL(outbody, 0x04, info->length);
 607                 req->out.vector[i+2].iov_base   = (void *)info->data;
 608                 req->out.vector[i+2].iov_len    = info->length;
 609         } else {
 610                 req->out.vector[i+2].iov_base = (void *)(outbody + 8);
 611                 req->out.vector[i+2].iov_len = 1;
 612         }
 613
 614         /* the error packet is the last response in the chain */
 615         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, 0);
 616         req->out.vector_count = req->current_idx + 3;
 617
 618         return smbd_smb2_request_reply(req);
 619 }
 620
 621 NTSTATUS smbd_smb2_request_error(struct smbd_smb2_request *req,
 622                                  NTSTATUS status)
 623 {
 624         return smbd_smb2_request_error_ex(req, status, NULL);
 625 }
 626
 627 NTSTATUS smbd_smb2_request_done_ex(struct smbd_smb2_request *req,
 628                                    NTSTATUS status,
 629                                    DATA_BLOB body, DATA_BLOB *dyn)
 630 {
 631         uint8_t *outhdr;
 632         uint8_t *outdyn;
 633         int i = req->current_idx;
 634         uint32_t next_command_ofs;
 635
 636         DEBUG(10,("smbd_smb2_request_done_ex: "
 637                   "idx[%d] status[%s] body[%u] dyn[%s:%u]\n",
 638                   i, nt_errstr(status), (unsigned int)body.length,
 639                   dyn ? "yes": "no",
 640                   (unsigned int)(dyn ? dyn->length : 0)));
 641
 642         if (body.length < 2) {
 643                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 644         }
 645
 646         if ((body.length % 2) != 0) {
 647                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 648         }
 649
 650         outhdr = (uint8_t *)req->out.vector[i].iov_base;
 651         /* the fallback dynamic buffer */
 652         outdyn = outhdr + SMB2_HDR_BODY + 8;
 653
 654         next_command_ofs = IVAL(outhdr, SMB2_HDR_NEXT_COMMAND);
 655         SIVAL(outhdr, SMB2_HDR_STATUS, NT_STATUS_V(status));
 656
 657         req->out.vector[i+1].iov_base = (void *)body.data;
 658         req->out.vector[i+1].iov_len = body.length;
 659
 660         if (dyn) {
 661                 if (dyn->length > 0) {
 662                         req->out.vector[i+2].iov_base   = (void *)dyn->data;
 663                         req->out.vector[i+2].iov_len    = dyn->length;
 664                 } else {
 665                         req->out.vector[i+2].iov_base   = (void *)outdyn;
 666                         req->out.vector[i+2].iov_len    = 1;
 667                 }
 668         } else {
 669                 req->out.vector[i+2].iov_base = NULL;
 670                 req->out.vector[i+2].iov_len = 0;
 671         }
 672
 673         /* see if we need to recalculate the offset to the next response */
 674         if (next_command_ofs > 0) {
 675                 next_command_ofs  = SMB2_HDR_BODY;
 676                 next_command_ofs += req->out.vector[i+1].iov_len;
 677                 next_command_ofs += req->out.vector[i+2].iov_len;
 678         }
 679
 680         /* TODO: we need to add padding ... */
 681         if ((next_command_ofs % 8) != 0) {
 682                 return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
 683         }
 684
 685         /* the error packet is the last response in the chain */
 686         SIVAL(outhdr, SMB2_HDR_NEXT_COMMAND, next_command_ofs);
 687
 688         return smbd_smb2_request_reply(req);
 689 }
 690
 691 NTSTATUS smbd_smb2_request_done(struct smbd_smb2_request *req,
 692                                 DATA_BLOB body, DATA_BLOB *dyn)
 693 {
 694         return smbd_smb2_request_done_ex(req, NT_STATUS_OK, body, dyn);
 695 }
 696
 697 struct smbd_smb2_request_read_state {
 698         size_t missing;
 699         bool asked_for_header;
 700         struct smbd_smb2_request *smb2_req;
 701 };
 702
 703 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 704                                          void *private_data,
 705                                          TALLOC_CTX *mem_ctx,
 706                                          struct iovec **_vector,
 707                                          size_t *_count);
 708 static void smbd_smb2_request_read_done(struct tevent_req *subreq);
 709
 710 static struct tevent_req *smbd_smb2_request_read_send(TALLOC_CTX *mem_ctx,
 711                                         struct tevent_context *ev,
 712                                         struct smbd_server_connection *conn)
 713 {
 714         struct tevent_req *req;
 715         struct smbd_smb2_request_read_state *state;
 716         struct tevent_req *subreq;
 717         TALLOC_CTX *mem_pool;
 718
 719         req = tevent_req_create(mem_ctx, &state,
 720                                 struct smbd_smb2_request_read_state);
 721         if (req == NULL) {
 722                 return NULL;
 723         }
 724         state->missing = 0;
 725         state->asked_for_header = false;
 726
 727         mem_pool = talloc_pool(state, 8192);
 728         if (tevent_req_nomem(mem_pool, req)) {
 729                 return tevent_req_post(req, ev);
 730         }
 731
 732         state->smb2_req = talloc_zero(mem_pool, struct smbd_smb2_request);
 733         if (tevent_req_nomem(state->smb2_req, req)) {
 734                 return tevent_req_post(req, ev);
 735         }
 736
 737         state->smb2_req->mem_pool       = mem_pool;
 738         state->smb2_req->conn           = conn;
 739
 740         subreq = tstream_readv_pdu_queue_send(state, ev, conn->smb2.stream,
 741                                               conn->smb2.recv_queue,
 742                                               smbd_smb2_request_next_vector,
 743                                               state);
 744         if (tevent_req_nomem(subreq, req)) {
 745                 return tevent_req_post(req, ev);
 746         }
 747         tevent_req_set_callback(subreq, smbd_smb2_request_read_done, req);
 748
 749         return req;
 750 }
 751
 752 static int smbd_smb2_request_next_vector(struct tstream_context *stream,
 753                                          void *private_data,
 754                                          TALLOC_CTX *mem_ctx,
 755                                          struct iovec **_vector,
 756                                          size_t *_count)
 757 {
 758         struct smbd_smb2_request_read_state *state =
 759                 talloc_get_type_abort(private_data,
 760                 struct smbd_smb2_request_read_state);
 761         struct smbd_smb2_request *req = state->smb2_req;
 762         struct iovec *vector;
 763         int idx = req->in.vector_count;
 764         size_t len = 0;
 765         uint8_t *buf = NULL;
 766
 767         if (req->in.vector_count == 0) {
 768                 /*
 769                  * first we need to get the NBT header
 770                  */
 771                 req->in.vector = talloc_array(req, struct iovec,
 772                                               req->in.vector_count + 1);
 773                 if (req->in.vector == NULL) {
 774                         return -1;
 775                 }
 776                 req->in.vector_count += 1;
 777
 778                 req->in.vector[idx].iov_base    = (void *)req->in.nbt_hdr;
 779                 req->in.vector[idx].iov_len     = 4;
 780
 781                 vector = talloc_array(mem_ctx, struct iovec, 1);
 782                 if (vector == NULL) {
 783                         return -1;
 784                 }
 785
 786                 vector[0] = req->in.vector[idx];
 787
 788                 *_vector = vector;
 789                 *_count = 1;
 790                 return 0;
 791         }
 792
 793         if (req->in.vector_count == 1) {
 794                 /*
 795                  * Now we analyze the NBT header
 796                  */
 797                 state->missing = smb2_len(req->in.vector[0].iov_base);
 798
 799                 if (state->missing == 0) {
 800                         /* if there're no remaining bytes, we're done */
 801                         *_vector = NULL;
 802                         *_count = 0;
 803                         return 0;
 804                 }
 805
 806                 req->in.vector = talloc_realloc(req, req->in.vector,
 807                                                 struct iovec,
 808                                                 req->in.vector_count + 1);
 809                 if (req->in.vector == NULL) {
 810                         return -1;
 811                 }
 812                 req->in.vector_count += 1;
 813
 814                 if (CVAL(req->in.vector[0].iov_base, 0) != 0) {
 815                         /*
 816                          * it's a special NBT message,
 817                          * so get all remaining bytes
 818                          */
 819                         len = state->missing;
 820                 } else if (state->missing < (SMB2_HDR_BODY + 2)) {
 821                         /*
 822                          * it's an invalid message, just read what we can get
 823                          * and let the caller handle the error
 824                          */
 825                         len = state->missing;
 826                 } else {
 827                         /*
 828                          * We assume it's a SMB2 request,
 829                          * and we first get the header and the
 830                          * first 2 bytes (the struct size) of the body
 831                          */
 832                         len = SMB2_HDR_BODY + 2;
 833
 834                         state->asked_for_header = true;
 835                 }
 836
 837                 state->missing -= len;
 838
 839                 buf = talloc_array(req->in.vector, uint8_t, len);
 840                 if (buf == NULL) {
 841                         return -1;
 842                 }
 843
 844                 req->in.vector[idx].iov_base    = (void *)buf;
 845                 req->in.vector[idx].iov_len     = len;
 846
 847                 vector = talloc_array(mem_ctx, struct iovec, 1);
 848                 if (vector == NULL) {
 849                         return -1;
 850                 }
 851
 852                 vector[0] = req->in.vector[idx];
 853
 854                 *_vector = vector;
 855                 *_count = 1;
 856                 return 0;
 857         }
 858
 859         if (state->missing == 0) {
 860                 /* if there're no remaining bytes, we're done */
 861                 *_vector = NULL;
 862                 *_count = 0;
 863                 return 0;
 864         }
 865
 866         if (state->asked_for_header) {
 867                 const uint8_t *hdr;
 868                 size_t full_size;
 869                 size_t next_command_ofs;
 870                 size_t body_size;
 871                 uint8_t *body;
 872                 size_t dyn_size;
 873                 uint8_t *dyn;
 874                 bool invalid = false;
 875
 876                 state->asked_for_header = false;
 877
 878                 /*
 879                  * We got the SMB2 header and the first 2 bytes
 880                  * of the body. We fix the size to just the header
 881                  * and manually copy the 2 first bytes to the body section
 882                  */
 883                 req->in.vector[idx-1].iov_len = SMB2_HDR_BODY;
 884                 hdr = (const uint8_t *)req->in.vector[idx-1].iov_base;
 885
 886                 /* allocate vectors for body and dynamic areas */
 887                 req->in.vector = talloc_realloc(req, req->in.vector,
 888                                                 struct iovec,
 889                                                 req->in.vector_count + 2);
 890                 if (req->in.vector == NULL) {
 891                         return -1;
 892                 }
 893                 req->in.vector_count += 2;
 894
 895                 full_size = state->missing + SMB2_HDR_BODY + 2;
 896                 next_command_ofs = IVAL(hdr, SMB2_HDR_NEXT_COMMAND);
 897                 body_size = SVAL(hdr, SMB2_HDR_BODY);
 898
 899                 if (next_command_ofs != 0) {
 900                         if (next_command_ofs < (SMB2_HDR_BODY + 2)) {
 901                                 /*
 902                                  * this is invalid, just return a zero
 903                                  * body and let the caller deal with the error
 904                                  */
 905                                 invalid = true;
 906                         } else if (next_command_ofs > full_size) {
 907                                 /*
 908                                  * this is invalid, just return a zero
 909                                  * body and let the caller deal with the error
 910                                  */
 911                                 invalid = true;
 912                         } else {
 913                                 full_size = next_command_ofs;
 914                         }
 915                 }
 916
 917                 if (!invalid) {
 918                         if (body_size < 2) {
 919                                 /*
 920                                  * this is invalid, just return a zero
 921                                  * body and let the caller deal with the error
 922                                  */
 923                                 invalid = true;
 924                         } else if (body_size > (full_size - SMB2_HDR_BODY)) {
 925                                 /*
 926                                  * this is invalid, just return a zero
 927                                  * body and let the caller deal with the error
 928                                  */
 929                                 invalid = true;
 930                         }
 931                 }
 932
 933                 if (invalid) {
 934                         /* the caller should check this */
 935                         body_size = 0;
 936                 }
 937
 938                 if ((body_size % 2) != 0) {
 939                         body_size -= 1;
 940                 }
 941
 942                 dyn_size = full_size - (SMB2_HDR_BODY + body_size);
 943
 944                 state->missing -= (body_size - 2) + dyn_size;
 945
 946                 body = talloc_array(req->in.vector, uint8_t, body_size);
 947                 if (body == NULL) {
 948                         return -1;
 949                 }
 950
 951                 dyn = talloc_array(req->in.vector, uint8_t, dyn_size);
 952                 if (dyn == NULL) {
 953                         return -1;
 954                 }
 955
 956                 req->in.vector[idx].iov_base    = (void *)body;
 957                 req->in.vector[idx].iov_len     = body_size;
 958                 req->in.vector[idx+1].iov_base  = (void *)dyn;
 959                 req->in.vector[idx+1].iov_len   = dyn_size;
 960
 961                 vector = talloc_array(mem_ctx, struct iovec, 2);
 962                 if (vector == NULL) {
 963                         return -1;
 964                 }
 965
 966                 /*
 967                  * the first 2 bytes of the body were already fetched
 968                  * together with the header
 969                  */
 970                 memcpy(body, hdr + SMB2_HDR_BODY, 2);
 971                 vector[0].iov_base = body + 2;
 972                 vector[0].iov_len = req->in.vector[idx].iov_len - 2;
 973
 974                 vector[1] = req->in.vector[idx+1];
 975
 976                 *_vector = vector;
 977                 *_count = 2;
 978                 return 0;
 979         }
 980
 981         /*
 982          * when we endup here, we're looking for a new SMB2 request
 983          * next. And we ask for its header and the first 2 bytes of
 984          * the body (like we did for the first SMB2 request).
 985          */
 986
 987         req->in.vector = talloc_realloc(req, req->in.vector,
 988                                         struct iovec,
 989                                         req->in.vector_count + 1);
 990         if (req->in.vector == NULL) {
 991                 return -1;
 992         }
 993         req->in.vector_count += 1;
 994
 995         /*
 996          * We assume it's a SMB2 request,
 997          * and we first get the header and the
 998          * first 2 bytes (the struct size) of the body
 999          */
1000         len = SMB2_HDR_BODY + 2;
1001
1002         if (len > state->missing) {
1003                 /* let the caller handle the error */
1004                 len = state->missing;
1005         }
1006
1007         state->missing -= len;
1008         state->asked_for_header = true;
1009
1010         buf = talloc_array(req->in.vector, uint8_t, len);
1011         if (buf == NULL) {
1012                 return -1;
1013         }
1014
1015         req->in.vector[idx].iov_base    = (void *)buf;
1016         req->in.vector[idx].iov_len     = len;
1017
1018         vector = talloc_array(mem_ctx, struct iovec, 1);
1019         if (vector == NULL) {
1020                 return -1;
1021         }
1022
1023         vector[0] = req->in.vector[idx];
1024
1025         *_vector = vector;
1026         *_count = 1;
1027         return 0;
1028 }
1029
1030 static void smbd_smb2_request_read_done(struct tevent_req *subreq)
1031 {
1032         struct tevent_req *req =
1033                 tevent_req_callback_data(subreq,
1034                 struct tevent_req);
1035         int ret;
1036         int sys_errno;
1037         NTSTATUS status;
1038
1039         ret = tstream_readv_pdu_queue_recv(subreq, &sys_errno);
1040         if (ret == -1) {
1041                 status = map_nt_error_from_unix(sys_errno);
1042                 tevent_req_nterror(req, status);
1043                 return;
1044         }
1045
1046         tevent_req_done(req);
1047 }
1048
1049 static NTSTATUS smbd_smb2_request_read_recv(struct tevent_req *req,
1050                                             TALLOC_CTX *mem_ctx,
1051                                             struct smbd_smb2_request **_smb2_req)
1052 {
1053         struct smbd_smb2_request_read_state *state =
1054                 tevent_req_data(req,
1055                 struct smbd_smb2_request_read_state);
1056         NTSTATUS status;
1057
1058         if (tevent_req_is_nterror(req, &status)) {
1059                 tevent_req_received(req);
1060                 return status;
1061         }
1062
1063         talloc_steal(mem_ctx, state->smb2_req->mem_pool);
1064         *_smb2_req = state->smb2_req;
1065         tevent_req_received(req);
1066         return NT_STATUS_OK;
1067 }
1068
1069 static void smbd_smb2_request_incoming(struct tevent_req *subreq);
1070
1071 void smbd_smb2_first_negprot(struct smbd_server_connection *conn,
1072                              const uint8_t *inbuf, size_t size)
1073 {
1074         NTSTATUS status;
1075         struct smbd_smb2_request *req;
1076         struct tevent_req *subreq;
1077
1078         DEBUG(10,("smbd_smb2_first_negprot: packet length %u\n",
1079                  (unsigned int)size));
1080
1081         status = smbd_initialize_smb2(conn);
1082         if (!NT_STATUS_IS_OK(status)) {
1083                 smbd_server_connection_terminate(conn, nt_errstr(status));
1084                 return;
1085         }
1086
1087         status = smbd_smb2_request_create(conn, inbuf, size, &req);
1088         if (!NT_STATUS_IS_OK(status)) {
1089                 smbd_server_connection_terminate(conn, nt_errstr(status));
1090                 return;
1091         }
1092
1093         status = smbd_smb2_request_setup_out(req);
1094         if (!NT_STATUS_IS_OK(status)) {
1095                 smbd_server_connection_terminate(conn, nt_errstr(status));
1096                 return;
1097         }
1098
1099         status = smbd_smb2_request_dispatch(req);
1100         if (!NT_STATUS_IS_OK(status)) {
1101                 smbd_server_connection_terminate(conn, nt_errstr(status));
1102                 return;
1103         }
1104
1105         /* ask for the next request */
1106         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1107         if (subreq == NULL) {
1108                 smbd_server_connection_terminate(conn, "no memory for reading");
1109                 return;
1110         }
1111         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1112 }
1113
1114 static void smbd_smb2_request_incoming(struct tevent_req *subreq)
1115 {
1116         struct smbd_server_connection *conn = tevent_req_callback_data(subreq,
1117                                               struct smbd_server_connection);
1118         NTSTATUS status;
1119         struct smbd_smb2_request *req;
1120
1121         status = smbd_smb2_request_read_recv(subreq, conn, &req);
1122         TALLOC_FREE(subreq);
1123         if (!NT_STATUS_IS_OK(status)) {
1124                 smbd_server_connection_terminate(conn, nt_errstr(status));
1125                 return;
1126         }
1127
1128         /* TODO: validate the incoming request */
1129         req->current_idx = 1;
1130
1131         DEBUG(10,("smbd_smb2_request_incoming: idx[%d] of %d vectors\n",
1132                  req->current_idx, req->in.vector_count));
1133
1134         status = smbd_smb2_request_setup_out(req);
1135         if (!NT_STATUS_IS_OK(status)) {
1136                 smbd_server_connection_terminate(conn, nt_errstr(status));
1137                 return;
1138         }
1139
1140         status = smbd_smb2_request_dispatch(req);
1141         if (!NT_STATUS_IS_OK(status)) {
1142                 smbd_server_connection_terminate(conn, nt_errstr(status));
1143                 return;
1144         }
1145
1146         /* ask for the next request (this constructs the main loop) */
1147         subreq = smbd_smb2_request_read_send(conn,conn->smb2.event_ctx, conn);
1148         if (subreq == NULL) {
1149                 smbd_server_connection_terminate(conn, "no memory for reading");
1150                 return;
1151         }
1152         tevent_req_set_callback(subreq, smbd_smb2_request_incoming, conn);
1153 }