source3/smbd/smb2_tcon.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/smbd.h"
  23 #include "smbd/globals.h"
  24 #include "../libcli/smb/smb_common.h"
  25 #include "../libcli/security/security.h"
  26 #include "auth.h"
  27 #include "lib/param/loadparm.h"
  28 #include "../lib/util/tevent_ntstatus.h"
  29 #include "lib/smbd_tevent_queue.h"
  30
  31 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
  32                                         struct tevent_context *ev,
  33                                         struct smbd_smb2_request *smb2req,
  34                                         const char *in_path);
  35 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
  36                                             uint8_t *out_share_type,
  37                                             uint32_t *out_share_flags,
  38                                             uint32_t *out_capabilities,
  39                                             uint32_t *out_maximal_access,
  40                                             uint32_t *out_tree_id);
  41
  42 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq);
  43
  44 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  45 {
  46         const uint8_t *inbody;
  47         uint16_t in_path_offset;
  48         uint16_t in_path_length;
  49         DATA_BLOB in_path_buffer;
  50         char *in_path_string;
  51         size_t in_path_string_size;
  52         NTSTATUS status;
  53         bool ok;
  54         struct tevent_req *subreq;
  55
  56         status = smbd_smb2_request_verify_sizes(req, 0x09);
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 return smbd_smb2_request_error(req, status);
  59         }
  60         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  61
  62         in_path_offset = SVAL(inbody, 0x04);
  63         in_path_length = SVAL(inbody, 0x06);
  64
  65         if (in_path_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  66                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         if (in_path_length > SMBD_SMB2_IN_DYN_LEN(req)) {
  70                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  71         }
  72
  73         in_path_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
  74         in_path_buffer.length = in_path_length;
  75
  76         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  77                                    in_path_buffer.data,
  78                                    in_path_buffer.length,
  79                                    &in_path_string,
  80                                    &in_path_string_size);
  81         if (!ok) {
  82                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  83         }
  84
  85         if (in_path_buffer.length == 0) {
  86                 in_path_string_size = 0;
  87         }
  88
  89         if (strlen(in_path_string) != in_path_string_size) {
  90                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  91         }
  92
  93         subreq = smbd_smb2_tree_connect_send(req,
  94                                              req->sconn->ev_ctx,
  95                                              req,
  96                                              in_path_string);
  97         if (subreq == NULL) {
  98                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  99         }
 100         tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);
 101
 102         return smbd_smb2_request_pending_queue(req, subreq, 500);
 103 }
 104
 105 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
 106 {
 107         struct smbd_smb2_request *req =
 108                 tevent_req_callback_data(subreq,
 109                 struct smbd_smb2_request);
 110         uint8_t *outhdr;
 111         DATA_BLOB outbody;
 112         uint8_t out_share_type = 0;
 113         uint32_t out_share_flags = 0;
 114         uint32_t out_capabilities = 0;
 115         uint32_t out_maximal_access = 0;
 116         uint32_t out_tree_id = 0;
 117         NTSTATUS status;
 118         NTSTATUS error;
 119
 120         status = smbd_smb2_tree_connect_recv(subreq,
 121                                              &out_share_type,
 122                                              &out_share_flags,
 123                                              &out_capabilities,
 124                                              &out_maximal_access,
 125                                              &out_tree_id);
 126         TALLOC_FREE(subreq);
 127         if (!NT_STATUS_IS_OK(status)) {
 128                 error = smbd_smb2_request_error(req, status);
 129                 if (!NT_STATUS_IS_OK(error)) {
 130                         smbd_server_connection_terminate(req->sconn,
 131                                                          nt_errstr(error));
 132                         return;
 133                 }
 134                 return;
 135         }
 136
 137         outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
 138
 139         outbody = data_blob_talloc(req->out.vector, NULL, 0x10);
 140         if (outbody.data == NULL) {
 141                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 142                 if (!NT_STATUS_IS_OK(error)) {
 143                         smbd_server_connection_terminate(req->sconn,
 144                                                          nt_errstr(error));
 145                         return;
 146                 }
 147                 return;
 148         }
 149
 150         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 151
 152         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 153         SCVAL(outbody.data, 0x02,
 154               out_share_type);                  /* share type */
 155         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 156         SIVAL(outbody.data, 0x04,
 157               out_share_flags);                 /* share flags */
 158         SIVAL(outbody.data, 0x08,
 159               out_capabilities);                /* capabilities */
 160         SIVAL(outbody.data, 0x0C,
 161               out_maximal_access);              /* maximal access */
 162
 163         error = smbd_smb2_request_done(req, outbody, NULL);
 164         if (!NT_STATUS_IS_OK(error)) {
 165                 smbd_server_connection_terminate(req->sconn,
 166                                                  nt_errstr(error));
 167                 return;
 168         }
 169 }
 170
 171 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 172                                        const char *in_path,
 173                                        uint8_t *out_share_type,
 174                                        uint32_t *out_share_flags,
 175                                        uint32_t *out_capabilities,
 176                                        uint32_t *out_maximal_access,
 177                                        uint32_t *out_tree_id)
 178 {
 179         struct smbXsrv_connection *conn = req->sconn->conn;
 180         const char *share = in_path;
 181         char *service = NULL;
 182         int snum = -1;
 183         struct smbXsrv_tcon *tcon;
 184         NTTIME now = timeval_to_nttime(&req->request_time);
 185         connection_struct *compat_conn = NULL;
 186         struct user_struct *compat_vuser = req->session->compat;
 187         NTSTATUS status;
 188         bool encryption_required = req->session->global->encryption_required;
 189         bool guest_session = false;
 190
 191         if (strncmp(share, "\\\\", 2) == 0) {
 192                 const char *p = strchr(share+2, '\\');
 193                 if (p) {
 194                         share = p + 1;
 195                 }
 196         }
 197
 198         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 199                   in_path, share));
 200
 201         service = talloc_strdup(talloc_tos(), share);
 202         if(!service) {
 203                 return NT_STATUS_NO_MEMORY;
 204         }
 205
 206         if (!strlower_m(service)) {
 207                 DEBUG(2, ("strlower_m %s failed\n", service));
 208                 return NT_STATUS_INVALID_PARAMETER;
 209         }
 210
 211         /* TODO: do more things... */
 212         if (strequal(service,HOMES_NAME)) {
 213                 if (compat_vuser->homes_snum == -1) {
 214                         DEBUG(2, ("[homes] share not available for "
 215                                 "user %s because it was not found "
 216                                 "or created at session setup "
 217                                 "time\n",
 218                                 compat_vuser->session_info->unix_info->unix_name));
 219                         return NT_STATUS_BAD_NETWORK_NAME;
 220                 }
 221                 snum = compat_vuser->homes_snum;
 222         } else if ((compat_vuser->homes_snum != -1)
 223                    && strequal(service,
 224                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 225                 snum = compat_vuser->homes_snum;
 226         } else {
 227                 snum = find_service(talloc_tos(), service, &service);
 228                 if (!service) {
 229                         return NT_STATUS_NO_MEMORY;
 230                 }
 231         }
 232
 233         if (snum < 0) {
 234                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 235                          service));
 236                 return NT_STATUS_BAD_NETWORK_NAME;
 237         }
 238
 239         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 240                 encryption_required = true;
 241         }
 242
 243         if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
 244                 guest_session = true;
 245         }
 246
 247         if (guest_session && encryption_required) {
 248                 DEBUG(1,("reject guest as encryption is required for service %s\n",
 249                          service));
 250                 return NT_STATUS_ACCESS_DENIED;
 251         }
 252
 253         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 254                 if (encryption_required) {
 255                         DEBUG(1,("reject tcon with dialect[0x%04X] "
 256                                  "as encryption is required for service %s\n",
 257                                  conn->smb2.server.dialect, service));
 258                         return NT_STATUS_ACCESS_DENIED;
 259                 }
 260         }
 261
 262         /* create a new tcon as child of the session */
 263         status = smb2srv_tcon_create(req->session, now, &tcon);
 264         if (!NT_STATUS_IS_OK(status)) {
 265                 return status;
 266         }
 267
 268         tcon->global->encryption_required = encryption_required;
 269
 270         compat_conn = make_connection_smb2(req->sconn,
 271                                         tcon, snum,
 272                                         req->session->compat,
 273                                         "???",
 274                                         &status);
 275         if (compat_conn == NULL) {
 276                 TALLOC_FREE(tcon);
 277                 return status;
 278         }
 279
 280         tcon->global->share_name = lp_servicename(tcon->global,
 281                                                   SNUM(compat_conn));
 282         if (tcon->global->share_name == NULL) {
 283                 conn_free(compat_conn);
 284                 TALLOC_FREE(tcon);
 285                 return NT_STATUS_NO_MEMORY;
 286         }
 287         tcon->global->session_global_id =
 288                 req->session->global->session_global_id;
 289
 290         tcon->compat = talloc_move(tcon, &compat_conn);
 291
 292         tcon->status = NT_STATUS_OK;
 293
 294         status = smbXsrv_tcon_update(tcon);
 295         if (!NT_STATUS_IS_OK(status)) {
 296                 TALLOC_FREE(tcon);
 297                 return status;
 298         }
 299
 300         if (IS_PRINT(tcon->compat)) {
 301                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 302         } else if (IS_IPC(tcon->compat)) {
 303                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 304         } else {
 305                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 306         }
 307
 308         *out_share_flags = 0;
 309
 310         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 311                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 312                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 313         } else {
 314                 *out_capabilities = 0;
 315         }
 316
 317         switch(lp_csc_policy(SNUM(tcon->compat))) {
 318         case CSC_POLICY_MANUAL:
 319                 break;
 320         case CSC_POLICY_DOCUMENTS:
 321                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 322                 break;
 323         case CSC_POLICY_PROGRAMS:
 324                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 325                 break;
 326         case CSC_POLICY_DISABLE:
 327                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 328                 break;
 329         default:
 330                 break;
 331         }
 332
 333         if (lp_hideunreadable(SNUM(tcon->compat)) ||
 334             lp_hideunwriteable_files(SNUM(tcon->compat))) {
 335                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 336         }
 337
 338         if (encryption_required) {
 339                 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
 340         }
 341
 342         *out_maximal_access = tcon->compat->share_access;
 343
 344         *out_tree_id = tcon->global->tcon_wire_id;
 345         return NT_STATUS_OK;
 346 }
 347
 348 struct smbd_smb2_tree_connect_state {
 349         const char *in_path;
 350         uint8_t out_share_type;
 351         uint32_t out_share_flags;
 352         uint32_t out_capabilities;
 353         uint32_t out_maximal_access;
 354         uint32_t out_tree_id;
 355 };
 356
 357 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 358                                         struct tevent_context *ev,
 359                                         struct smbd_smb2_request *smb2req,
 360                                         const char *in_path)
 361 {
 362         struct tevent_req *req;
 363         struct smbd_smb2_tree_connect_state *state;
 364         NTSTATUS status;
 365
 366         req = tevent_req_create(mem_ctx, &state,
 367                                 struct smbd_smb2_tree_connect_state);
 368         if (req == NULL) {
 369                 return NULL;
 370         }
 371         state->in_path = in_path;
 372
 373         status = smbd_smb2_tree_connect(smb2req,
 374                                         state->in_path,
 375                                         &state->out_share_type,
 376                                         &state->out_share_flags,
 377                                         &state->out_capabilities,
 378                                         &state->out_maximal_access,
 379                                         &state->out_tree_id);
 380         if (tevent_req_nterror(req, status)) {
 381                 return tevent_req_post(req, ev);
 382         }
 383
 384         tevent_req_done(req);
 385         return tevent_req_post(req, ev);
 386 }
 387
 388 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 389                                             uint8_t *out_share_type,
 390                                             uint32_t *out_share_flags,
 391                                             uint32_t *out_capabilities,
 392                                             uint32_t *out_maximal_access,
 393                                             uint32_t *out_tree_id)
 394 {
 395         struct smbd_smb2_tree_connect_state *state =
 396                 tevent_req_data(req,
 397                 struct smbd_smb2_tree_connect_state);
 398         NTSTATUS status;
 399
 400         if (tevent_req_is_nterror(req, &status)) {
 401                 tevent_req_received(req);
 402                 return status;
 403         }
 404
 405         *out_share_type = state->out_share_type;
 406         *out_share_flags = state->out_share_flags;
 407         *out_capabilities = state->out_capabilities;
 408         *out_maximal_access = state->out_maximal_access;
 409         *out_tree_id = state->out_tree_id;
 410
 411         tevent_req_received(req);
 412         return NT_STATUS_OK;
 413 }
 414
 415 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 416                                         struct tevent_context *ev,
 417                                         struct smbd_smb2_request *smb2req);
 418 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
 419 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
 420
 421 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 422 {
 423         NTSTATUS status;
 424         struct tevent_req *subreq = NULL;
 425
 426         status = smbd_smb2_request_verify_sizes(req, 0x04);
 427         if (!NT_STATUS_IS_OK(status)) {
 428                 return smbd_smb2_request_error(req, status);
 429         }
 430
 431         subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
 432         if (subreq == NULL) {
 433                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 434         }
 435         tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
 436
 437         /*
 438          * Wait a long time before going async on this to allow
 439          * requests we're waiting on to finish. Set timeout to 10 secs.
 440          */
 441         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 442 }
 443
 444 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
 445 {
 446         struct smbd_smb2_request *smb2req =
 447                 tevent_req_callback_data(subreq,
 448                 struct smbd_smb2_request);
 449         DATA_BLOB outbody;
 450         NTSTATUS status;
 451         NTSTATUS error;
 452
 453         status = smbd_smb2_tdis_recv(subreq);
 454         TALLOC_FREE(subreq);
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 error = smbd_smb2_request_error(smb2req, status);
 457                 if (!NT_STATUS_IS_OK(error)) {
 458                         smbd_server_connection_terminate(smb2req->sconn,
 459                                                         nt_errstr(error));
 460                         return;
 461                 }
 462                 return;
 463         }
 464
 465         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 466         if (outbody.data == NULL) {
 467                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 468                 if (!NT_STATUS_IS_OK(error)) {
 469                         smbd_server_connection_terminate(smb2req->sconn,
 470                                                         nt_errstr(error));
 471                         return;
 472                 }
 473                 return;
 474         }
 475
 476         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 477         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 478
 479         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 480         if (!NT_STATUS_IS_OK(error)) {
 481                 smbd_server_connection_terminate(smb2req->sconn,
 482                                                 nt_errstr(error));
 483                 return;
 484         }
 485 }
 486
 487 struct smbd_smb2_tdis_state {
 488         struct smbd_smb2_request *smb2req;
 489         struct tevent_queue *wait_queue;
 490 };
 491
 492 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
 493
 494 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 495                                         struct tevent_context *ev,
 496                                         struct smbd_smb2_request *smb2req)
 497 {
 498         struct tevent_req *req;
 499         struct smbd_smb2_tdis_state *state;
 500         struct tevent_req *subreq;
 501         struct smbd_smb2_request *preq;
 502
 503         req = tevent_req_create(mem_ctx, &state,
 504                         struct smbd_smb2_tdis_state);
 505         if (req == NULL) {
 506                 return NULL;
 507         }
 508         state->smb2req = smb2req;
 509
 510         state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
 511         if (tevent_req_nomem(state->wait_queue, req)) {
 512                 return tevent_req_post(req, ev);
 513         }
 514
 515         /*
 516          * Make sure that no new request will be able to use this tcon.
 517          */
 518         smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 519
 520         for (preq = smb2req->sconn->smb2.requests; preq != NULL; preq = preq->next) {
 521                 if (preq == smb2req) {
 522                         /* Can't cancel current request. */
 523                         continue;
 524                 }
 525                 if (preq->tcon != smb2req->tcon) {
 526                         /* Request on different tcon. */
 527                         continue;
 528                 }
 529
 530                 /*
 531                  * Never cancel anything in a compound
 532                  * request. Way too hard to deal with
 533                  * the result.
 534                  */
 535                 if (!preq->compound_related && preq->subreq != NULL) {
 536                         tevent_req_cancel(preq->subreq);
 537                 }
 538
 539                 /*
 540                  * Now wait until the request is finished.
 541                  *
 542                  * We don't set a callback, as we just want to block the
 543                  * wait queue and the talloc_free() of the request will
 544                  * remove the item from the wait queue.
 545                  */
 546                 subreq = smbd_tevent_queue_wait_send(preq, ev, state->wait_queue);
 547                 if (tevent_req_nomem(subreq, req)) {
 548                         return tevent_req_post(req, ev);
 549                 }
 550         }
 551
 552         /*
 553          * Now we add our own waiter to the end of the queue,
 554          * this way we get notified when all pending requests are finished
 555          * and send to the socket.
 556          */
 557         subreq = smbd_tevent_queue_wait_send(state, ev, state->wait_queue);
 558         if (tevent_req_nomem(subreq, req)) {
 559                 return tevent_req_post(req, ev);
 560         }
 561         tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
 562
 563         return req;
 564 }
 565
 566 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
 567 {
 568         struct tevent_req *req = tevent_req_callback_data(
 569                 subreq, struct tevent_req);
 570         struct smbd_smb2_tdis_state *state = tevent_req_data(
 571                 req, struct smbd_smb2_tdis_state);
 572         NTSTATUS status;
 573
 574         smbd_tevent_queue_wait_recv(subreq);
 575         TALLOC_FREE(subreq);
 576
 577         /*
 578          * As we've been awoken, we may have changed
 579          * uid in the meantime. Ensure we're still
 580          * root (SMB2_OP_TDIS has .as_root = true).
 581          */
 582         change_to_root_user();
 583
 584         status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
 585                                          state->smb2req->tcon->compat->vuid);
 586         if (tevent_req_nterror(req, status)) {
 587                 return;
 588         }
 589
 590         /* We did tear down the tcon. */
 591         TALLOC_FREE(state->smb2req->tcon);
 592         tevent_req_done(req);
 593 }
 594
 595 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
 596 {
 597         return tevent_req_simple_recv_ntstatus(req);
 598 }