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_desired = req->session->encryption_desired;
 189         bool encryption_required = req->session->global->encryption_required;
 190         bool guest_session = false;
 191
 192         if (strncmp(share, "\\\\", 2) == 0) {
 193                 const char *p = strchr(share+2, '\\');
 194                 if (p) {
 195                         share = p + 1;
 196                 }
 197         }
 198
 199         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 200                   in_path, share));
 201
 202         service = talloc_strdup(talloc_tos(), share);
 203         if(!service) {
 204                 return NT_STATUS_NO_MEMORY;
 205         }
 206
 207         if (!strlower_m(service)) {
 208                 DEBUG(2, ("strlower_m %s failed\n", service));
 209                 return NT_STATUS_INVALID_PARAMETER;
 210         }
 211
 212         /* TODO: do more things... */
 213         if (strequal(service,HOMES_NAME)) {
 214                 if (compat_vuser->homes_snum == -1) {
 215                         DEBUG(2, ("[homes] share not available for "
 216                                 "user %s because it was not found "
 217                                 "or created at session setup "
 218                                 "time\n",
 219                                 compat_vuser->session_info->unix_info->unix_name));
 220                         return NT_STATUS_BAD_NETWORK_NAME;
 221                 }
 222                 snum = compat_vuser->homes_snum;
 223         } else if ((compat_vuser->homes_snum != -1)
 224                    && strequal(service,
 225                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 226                 snum = compat_vuser->homes_snum;
 227         } else {
 228                 snum = find_service(talloc_tos(), service, &service);
 229                 if (!service) {
 230                         return NT_STATUS_NO_MEMORY;
 231                 }
 232         }
 233
 234         if (snum < 0) {
 235                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 236                          service));
 237                 return NT_STATUS_BAD_NETWORK_NAME;
 238         }
 239
 240         if ((lp_smb_encrypt(snum) >= SMB_SIGNING_DESIRED) &&
 241             (conn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
 242                 encryption_desired = true;
 243         }
 244
 245         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 246                 encryption_desired = true;
 247                 encryption_required = true;
 248         }
 249
 250         if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
 251                 guest_session = true;
 252         }
 253
 254         if (guest_session && encryption_required) {
 255                 DEBUG(1,("reject guest as encryption is required for service %s\n",
 256                          service));
 257                 return NT_STATUS_ACCESS_DENIED;
 258         }
 259
 260         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 261                 if (encryption_required) {
 262                         DEBUG(1,("reject tcon with dialect[0x%04X] "
 263                                  "as encryption is required for service %s\n",
 264                                  conn->smb2.server.dialect, service));
 265                         return NT_STATUS_ACCESS_DENIED;
 266                 }
 267         }
 268
 269         /* create a new tcon as child of the session */
 270         status = smb2srv_tcon_create(req->session, now, &tcon);
 271         if (!NT_STATUS_IS_OK(status)) {
 272                 return status;
 273         }
 274
 275         tcon->encryption_desired = encryption_desired;
 276         tcon->global->encryption_required = encryption_required;
 277
 278         compat_conn = make_connection_smb2(req->sconn,
 279                                         tcon, snum,
 280                                         req->session->compat,
 281                                         "???",
 282                                         &status);
 283         if (compat_conn == NULL) {
 284                 TALLOC_FREE(tcon);
 285                 return status;
 286         }
 287
 288         tcon->global->share_name = lp_servicename(tcon->global,
 289                                                   SNUM(compat_conn));
 290         if (tcon->global->share_name == NULL) {
 291                 conn_free(compat_conn);
 292                 TALLOC_FREE(tcon);
 293                 return NT_STATUS_NO_MEMORY;
 294         }
 295         tcon->global->session_global_id =
 296                 req->session->global->session_global_id;
 297
 298         tcon->compat = talloc_move(tcon, &compat_conn);
 299
 300         tcon->status = NT_STATUS_OK;
 301
 302         status = smbXsrv_tcon_update(tcon);
 303         if (!NT_STATUS_IS_OK(status)) {
 304                 TALLOC_FREE(tcon);
 305                 return status;
 306         }
 307
 308         if (IS_PRINT(tcon->compat)) {
 309                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 310         } else if (IS_IPC(tcon->compat)) {
 311                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 312         } else {
 313                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 314         }
 315
 316         *out_share_flags = 0;
 317
 318         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 319                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 320                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 321         } else {
 322                 *out_capabilities = 0;
 323         }
 324
 325         switch(lp_csc_policy(SNUM(tcon->compat))) {
 326         case CSC_POLICY_MANUAL:
 327                 break;
 328         case CSC_POLICY_DOCUMENTS:
 329                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 330                 break;
 331         case CSC_POLICY_PROGRAMS:
 332                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 333                 break;
 334         case CSC_POLICY_DISABLE:
 335                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 336                 break;
 337         default:
 338                 break;
 339         }
 340
 341         if (lp_hideunreadable(SNUM(tcon->compat)) ||
 342             lp_hideunwriteable_files(SNUM(tcon->compat))) {
 343                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 344         }
 345
 346         if (encryption_desired) {
 347                 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
 348         }
 349
 350         *out_maximal_access = tcon->compat->share_access;
 351
 352         *out_tree_id = tcon->global->tcon_wire_id;
 353         return NT_STATUS_OK;
 354 }
 355
 356 struct smbd_smb2_tree_connect_state {
 357         const char *in_path;
 358         uint8_t out_share_type;
 359         uint32_t out_share_flags;
 360         uint32_t out_capabilities;
 361         uint32_t out_maximal_access;
 362         uint32_t out_tree_id;
 363 };
 364
 365 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 366                                         struct tevent_context *ev,
 367                                         struct smbd_smb2_request *smb2req,
 368                                         const char *in_path)
 369 {
 370         struct tevent_req *req;
 371         struct smbd_smb2_tree_connect_state *state;
 372         NTSTATUS status;
 373
 374         req = tevent_req_create(mem_ctx, &state,
 375                                 struct smbd_smb2_tree_connect_state);
 376         if (req == NULL) {
 377                 return NULL;
 378         }
 379         state->in_path = in_path;
 380
 381         status = smbd_smb2_tree_connect(smb2req,
 382                                         state->in_path,
 383                                         &state->out_share_type,
 384                                         &state->out_share_flags,
 385                                         &state->out_capabilities,
 386                                         &state->out_maximal_access,
 387                                         &state->out_tree_id);
 388         if (tevent_req_nterror(req, status)) {
 389                 return tevent_req_post(req, ev);
 390         }
 391
 392         tevent_req_done(req);
 393         return tevent_req_post(req, ev);
 394 }
 395
 396 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 397                                             uint8_t *out_share_type,
 398                                             uint32_t *out_share_flags,
 399                                             uint32_t *out_capabilities,
 400                                             uint32_t *out_maximal_access,
 401                                             uint32_t *out_tree_id)
 402 {
 403         struct smbd_smb2_tree_connect_state *state =
 404                 tevent_req_data(req,
 405                 struct smbd_smb2_tree_connect_state);
 406         NTSTATUS status;
 407
 408         if (tevent_req_is_nterror(req, &status)) {
 409                 tevent_req_received(req);
 410                 return status;
 411         }
 412
 413         *out_share_type = state->out_share_type;
 414         *out_share_flags = state->out_share_flags;
 415         *out_capabilities = state->out_capabilities;
 416         *out_maximal_access = state->out_maximal_access;
 417         *out_tree_id = state->out_tree_id;
 418
 419         tevent_req_received(req);
 420         return NT_STATUS_OK;
 421 }
 422
 423 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 424                                         struct tevent_context *ev,
 425                                         struct smbd_smb2_request *smb2req);
 426 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
 427 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
 428
 429 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 430 {
 431         NTSTATUS status;
 432         struct tevent_req *subreq = NULL;
 433
 434         status = smbd_smb2_request_verify_sizes(req, 0x04);
 435         if (!NT_STATUS_IS_OK(status)) {
 436                 return smbd_smb2_request_error(req, status);
 437         }
 438
 439         subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
 440         if (subreq == NULL) {
 441                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 442         }
 443         tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
 444
 445         /*
 446          * Wait a long time before going async on this to allow
 447          * requests we're waiting on to finish. Set timeout to 10 secs.
 448          */
 449         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 450 }
 451
 452 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
 453 {
 454         struct smbd_smb2_request *smb2req =
 455                 tevent_req_callback_data(subreq,
 456                 struct smbd_smb2_request);
 457         DATA_BLOB outbody;
 458         NTSTATUS status;
 459         NTSTATUS error;
 460
 461         status = smbd_smb2_tdis_recv(subreq);
 462         TALLOC_FREE(subreq);
 463         if (!NT_STATUS_IS_OK(status)) {
 464                 error = smbd_smb2_request_error(smb2req, status);
 465                 if (!NT_STATUS_IS_OK(error)) {
 466                         smbd_server_connection_terminate(smb2req->sconn,
 467                                                         nt_errstr(error));
 468                         return;
 469                 }
 470                 return;
 471         }
 472
 473         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 474         if (outbody.data == NULL) {
 475                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 476                 if (!NT_STATUS_IS_OK(error)) {
 477                         smbd_server_connection_terminate(smb2req->sconn,
 478                                                         nt_errstr(error));
 479                         return;
 480                 }
 481                 return;
 482         }
 483
 484         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 485         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 486
 487         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 488         if (!NT_STATUS_IS_OK(error)) {
 489                 smbd_server_connection_terminate(smb2req->sconn,
 490                                                 nt_errstr(error));
 491                 return;
 492         }
 493 }
 494
 495 struct smbd_smb2_tdis_state {
 496         struct smbd_smb2_request *smb2req;
 497         struct tevent_queue *wait_queue;
 498 };
 499
 500 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
 501
 502 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 503                                         struct tevent_context *ev,
 504                                         struct smbd_smb2_request *smb2req)
 505 {
 506         struct tevent_req *req;
 507         struct smbd_smb2_tdis_state *state;
 508         struct tevent_req *subreq;
 509         struct smbd_smb2_request *preq;
 510
 511         req = tevent_req_create(mem_ctx, &state,
 512                         struct smbd_smb2_tdis_state);
 513         if (req == NULL) {
 514                 return NULL;
 515         }
 516         state->smb2req = smb2req;
 517
 518         state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
 519         if (tevent_req_nomem(state->wait_queue, req)) {
 520                 return tevent_req_post(req, ev);
 521         }
 522
 523         /*
 524          * Make sure that no new request will be able to use this tcon.
 525          */
 526         smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 527
 528         for (preq = smb2req->sconn->smb2.requests; preq != NULL; preq = preq->next) {
 529                 if (preq == smb2req) {
 530                         /* Can't cancel current request. */
 531                         continue;
 532                 }
 533                 if (preq->tcon != smb2req->tcon) {
 534                         /* Request on different tcon. */
 535                         continue;
 536                 }
 537
 538                 /*
 539                  * Never cancel anything in a compound
 540                  * request. Way too hard to deal with
 541                  * the result.
 542                  */
 543                 if (!preq->compound_related && preq->subreq != NULL) {
 544                         tevent_req_cancel(preq->subreq);
 545                 }
 546
 547                 /*
 548                  * Now wait until the request is finished.
 549                  *
 550                  * We don't set a callback, as we just want to block the
 551                  * wait queue and the talloc_free() of the request will
 552                  * remove the item from the wait queue.
 553                  */
 554                 subreq = smbd_tevent_queue_wait_send(preq, ev, state->wait_queue);
 555                 if (tevent_req_nomem(subreq, req)) {
 556                         return tevent_req_post(req, ev);
 557                 }
 558         }
 559
 560         /*
 561          * Now we add our own waiter to the end of the queue,
 562          * this way we get notified when all pending requests are finished
 563          * and send to the socket.
 564          */
 565         subreq = smbd_tevent_queue_wait_send(state, ev, state->wait_queue);
 566         if (tevent_req_nomem(subreq, req)) {
 567                 return tevent_req_post(req, ev);
 568         }
 569         tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
 570
 571         return req;
 572 }
 573
 574 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
 575 {
 576         struct tevent_req *req = tevent_req_callback_data(
 577                 subreq, struct tevent_req);
 578         struct smbd_smb2_tdis_state *state = tevent_req_data(
 579                 req, struct smbd_smb2_tdis_state);
 580         NTSTATUS status;
 581
 582         smbd_tevent_queue_wait_recv(subreq);
 583         TALLOC_FREE(subreq);
 584
 585         /*
 586          * As we've been awoken, we may have changed
 587          * uid in the meantime. Ensure we're still
 588          * root (SMB2_OP_TDIS has .as_root = true).
 589          */
 590         change_to_root_user();
 591
 592         status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
 593                                          state->smb2req->tcon->compat->vuid);
 594         if (tevent_req_nterror(req, status)) {
 595                 return;
 596         }
 597
 598         /* We did tear down the tcon. */
 599         TALLOC_FREE(state->smb2req->tcon);
 600         tevent_req_done(req);
 601 }
 602
 603 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
 604 {
 605         return tevent_req_simple_recv_ntstatus(req);
 606 }