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
  30 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
  31                                         struct tevent_context *ev,
  32                                         struct smbd_smb2_request *smb2req,
  33                                         const char *in_path);
  34 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
  35                                             uint8_t *out_share_type,
  36                                             uint32_t *out_share_flags,
  37                                             uint32_t *out_capabilities,
  38                                             uint32_t *out_maximal_access,
  39                                             uint32_t *out_tree_id);
  40
  41 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq);
  42
  43 NTSTATUS smbd_smb2_request_process_tcon(struct smbd_smb2_request *req)
  44 {
  45         const uint8_t *inbody;
  46         uint16_t in_path_offset;
  47         uint16_t in_path_length;
  48         DATA_BLOB in_path_buffer;
  49         char *in_path_string;
  50         size_t in_path_string_size;
  51         NTSTATUS status;
  52         bool ok;
  53         struct tevent_req *subreq;
  54
  55         status = smbd_smb2_request_verify_sizes(req, 0x09);
  56         if (!NT_STATUS_IS_OK(status)) {
  57                 return smbd_smb2_request_error(req, status);
  58         }
  59         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  60
  61         in_path_offset = SVAL(inbody, 0x04);
  62         in_path_length = SVAL(inbody, 0x06);
  63
  64         if (in_path_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(req))) {
  65                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  66         }
  67
  68         if (in_path_length > SMBD_SMB2_IN_DYN_LEN(req)) {
  69                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
  70         }
  71
  72         in_path_buffer.data = SMBD_SMB2_IN_DYN_PTR(req);
  73         in_path_buffer.length = in_path_length;
  74
  75         ok = convert_string_talloc(req, CH_UTF16, CH_UNIX,
  76                                    in_path_buffer.data,
  77                                    in_path_buffer.length,
  78                                    &in_path_string,
  79                                    &in_path_string_size);
  80         if (!ok) {
  81                 return smbd_smb2_request_error(req, NT_STATUS_ILLEGAL_CHARACTER);
  82         }
  83
  84         if (in_path_buffer.length == 0) {
  85                 in_path_string_size = 0;
  86         }
  87
  88         if (strlen(in_path_string) != in_path_string_size) {
  89                 return smbd_smb2_request_error(req, NT_STATUS_BAD_NETWORK_NAME);
  90         }
  91
  92         subreq = smbd_smb2_tree_connect_send(req,
  93                                              req->sconn->ev_ctx,
  94                                              req,
  95                                              in_path_string);
  96         if (subreq == NULL) {
  97                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  98         }
  99         tevent_req_set_callback(subreq, smbd_smb2_request_tcon_done, req);
 100
 101         return smbd_smb2_request_pending_queue(req, subreq, 500);
 102 }
 103
 104 static void smbd_smb2_request_tcon_done(struct tevent_req *subreq)
 105 {
 106         struct smbd_smb2_request *req =
 107                 tevent_req_callback_data(subreq,
 108                 struct smbd_smb2_request);
 109         uint8_t *outhdr;
 110         DATA_BLOB outbody;
 111         uint8_t out_share_type = 0;
 112         uint32_t out_share_flags = 0;
 113         uint32_t out_capabilities = 0;
 114         uint32_t out_maximal_access = 0;
 115         uint32_t out_tree_id = 0;
 116         NTSTATUS status;
 117         NTSTATUS error;
 118
 119         status = smbd_smb2_tree_connect_recv(subreq,
 120                                              &out_share_type,
 121                                              &out_share_flags,
 122                                              &out_capabilities,
 123                                              &out_maximal_access,
 124                                              &out_tree_id);
 125         TALLOC_FREE(subreq);
 126         if (!NT_STATUS_IS_OK(status)) {
 127                 error = smbd_smb2_request_error(req, status);
 128                 if (!NT_STATUS_IS_OK(error)) {
 129                         smbd_server_connection_terminate(req->xconn,
 130                                                          nt_errstr(error));
 131                         return;
 132                 }
 133                 return;
 134         }
 135
 136         outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
 137
 138         outbody = smbd_smb2_generate_outbody(req, 0x10);
 139         if (outbody.data == NULL) {
 140                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 141                 if (!NT_STATUS_IS_OK(error)) {
 142                         smbd_server_connection_terminate(req->xconn,
 143                                                          nt_errstr(error));
 144                         return;
 145                 }
 146                 return;
 147         }
 148
 149         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 150
 151         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 152         SCVAL(outbody.data, 0x02,
 153               out_share_type);                  /* share type */
 154         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 155         SIVAL(outbody.data, 0x04,
 156               out_share_flags);                 /* share flags */
 157         SIVAL(outbody.data, 0x08,
 158               out_capabilities);                /* capabilities */
 159         SIVAL(outbody.data, 0x0C,
 160               out_maximal_access);              /* maximal access */
 161
 162         error = smbd_smb2_request_done(req, outbody, NULL);
 163         if (!NT_STATUS_IS_OK(error)) {
 164                 smbd_server_connection_terminate(req->xconn,
 165                                                  nt_errstr(error));
 166                 return;
 167         }
 168 }
 169
 170 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 171                                        const char *in_path,
 172                                        uint8_t *out_share_type,
 173                                        uint32_t *out_share_flags,
 174                                        uint32_t *out_capabilities,
 175                                        uint32_t *out_maximal_access,
 176                                        uint32_t *out_tree_id)
 177 {
 178         struct smbXsrv_connection *conn = req->xconn;
 179         const char *share = in_path;
 180         char *service = NULL;
 181         int snum = -1;
 182         struct smbXsrv_tcon *tcon;
 183         NTTIME now = timeval_to_nttime(&req->request_time);
 184         connection_struct *compat_conn = NULL;
 185         struct user_struct *compat_vuser = req->session->compat;
 186         NTSTATUS status;
 187         bool encryption_required = req->session->global->encryption_required;
 188         bool guest_session = false;
 189
 190         if (strncmp(share, "\\\\", 2) == 0) {
 191                 const char *p = strchr(share+2, '\\');
 192                 if (p) {
 193                         share = p + 1;
 194                 }
 195         }
 196
 197         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 198                   in_path, share));
 199
 200         service = talloc_strdup(talloc_tos(), share);
 201         if(!service) {
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204
 205         if (!strlower_m(service)) {
 206                 DEBUG(2, ("strlower_m %s failed\n", service));
 207                 return NT_STATUS_INVALID_PARAMETER;
 208         }
 209
 210         /* TODO: do more things... */
 211         if (strequal(service,HOMES_NAME)) {
 212                 if (compat_vuser->homes_snum == -1) {
 213                         DEBUG(2, ("[homes] share not available for "
 214                                 "user %s because it was not found "
 215                                 "or created at session setup "
 216                                 "time\n",
 217                                 compat_vuser->session_info->unix_info->unix_name));
 218                         return NT_STATUS_BAD_NETWORK_NAME;
 219                 }
 220                 snum = compat_vuser->homes_snum;
 221         } else if ((compat_vuser->homes_snum != -1)
 222                    && strequal(service,
 223                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 224                 snum = compat_vuser->homes_snum;
 225         } else {
 226                 snum = find_service(talloc_tos(), service, &service);
 227                 if (!service) {
 228                         return NT_STATUS_NO_MEMORY;
 229                 }
 230         }
 231
 232         if (snum < 0) {
 233                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 234                          service));
 235                 return NT_STATUS_BAD_NETWORK_NAME;
 236         }
 237
 238         if ((lp_smb_encrypt(snum) > SMB_SIGNING_OFF) &&
 239             (conn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
 240                 encryption_required = true;
 241         }
 242
 243         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 244                 encryption_required = true;
 245         }
 246
 247         if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
 248                 guest_session = true;
 249         }
 250
 251         if (guest_session && encryption_required) {
 252                 DEBUG(1,("reject guest as encryption is required for service %s\n",
 253                          service));
 254                 return NT_STATUS_ACCESS_DENIED;
 255         }
 256
 257         if (conn->smb2.server.cipher == 0) {
 258                 if (encryption_required) {
 259                         DEBUG(1,("reject tcon with dialect[0x%04X] "
 260                                  "as encryption is required for service %s\n",
 261                                  conn->smb2.server.dialect, service));
 262                         return NT_STATUS_ACCESS_DENIED;
 263                 }
 264         }
 265
 266         /* create a new tcon as child of the session */
 267         status = smb2srv_tcon_create(req->session, now, &tcon);
 268         if (!NT_STATUS_IS_OK(status)) {
 269                 return status;
 270         }
 271
 272         tcon->global->encryption_required = encryption_required;
 273
 274         compat_conn = make_connection_smb2(req,
 275                                         tcon, snum,
 276                                         req->session->compat,
 277                                         "???",
 278                                         &status);
 279         if (compat_conn == NULL) {
 280                 TALLOC_FREE(tcon);
 281                 return status;
 282         }
 283
 284         tcon->global->share_name = lp_servicename(tcon->global,
 285                                                   SNUM(compat_conn));
 286         if (tcon->global->share_name == NULL) {
 287                 conn_free(compat_conn);
 288                 TALLOC_FREE(tcon);
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291         tcon->global->session_global_id =
 292                 req->session->global->session_global_id;
 293
 294         tcon->compat = talloc_move(tcon, &compat_conn);
 295
 296         tcon->status = NT_STATUS_OK;
 297
 298         status = smbXsrv_tcon_update(tcon);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 TALLOC_FREE(tcon);
 301                 return status;
 302         }
 303
 304         if (IS_PRINT(tcon->compat)) {
 305                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 306         } else if (IS_IPC(tcon->compat)) {
 307                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 308         } else {
 309                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 310         }
 311
 312         *out_share_flags = 0;
 313
 314         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 315                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 316                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 317         } else {
 318                 *out_capabilities = 0;
 319         }
 320
 321         switch(lp_csc_policy(SNUM(tcon->compat))) {
 322         case CSC_POLICY_MANUAL:
 323                 break;
 324         case CSC_POLICY_DOCUMENTS:
 325                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 326                 break;
 327         case CSC_POLICY_PROGRAMS:
 328                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 329                 break;
 330         case CSC_POLICY_DISABLE:
 331                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 332                 break;
 333         default:
 334                 break;
 335         }
 336
 337         if (lp_hide_unreadable(SNUM(tcon->compat)) ||
 338             lp_hide_unwriteable_files(SNUM(tcon->compat))) {
 339                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 340         }
 341
 342         if (encryption_required) {
 343                 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
 344         }
 345
 346         *out_maximal_access = tcon->compat->share_access;
 347
 348         *out_tree_id = tcon->global->tcon_wire_id;
 349         return NT_STATUS_OK;
 350 }
 351
 352 struct smbd_smb2_tree_connect_state {
 353         const char *in_path;
 354         uint8_t out_share_type;
 355         uint32_t out_share_flags;
 356         uint32_t out_capabilities;
 357         uint32_t out_maximal_access;
 358         uint32_t out_tree_id;
 359 };
 360
 361 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 362                                         struct tevent_context *ev,
 363                                         struct smbd_smb2_request *smb2req,
 364                                         const char *in_path)
 365 {
 366         struct tevent_req *req;
 367         struct smbd_smb2_tree_connect_state *state;
 368         NTSTATUS status;
 369
 370         req = tevent_req_create(mem_ctx, &state,
 371                                 struct smbd_smb2_tree_connect_state);
 372         if (req == NULL) {
 373                 return NULL;
 374         }
 375         state->in_path = in_path;
 376
 377         status = smbd_smb2_tree_connect(smb2req,
 378                                         state->in_path,
 379                                         &state->out_share_type,
 380                                         &state->out_share_flags,
 381                                         &state->out_capabilities,
 382                                         &state->out_maximal_access,
 383                                         &state->out_tree_id);
 384         if (tevent_req_nterror(req, status)) {
 385                 return tevent_req_post(req, ev);
 386         }
 387
 388         tevent_req_done(req);
 389         return tevent_req_post(req, ev);
 390 }
 391
 392 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 393                                             uint8_t *out_share_type,
 394                                             uint32_t *out_share_flags,
 395                                             uint32_t *out_capabilities,
 396                                             uint32_t *out_maximal_access,
 397                                             uint32_t *out_tree_id)
 398 {
 399         struct smbd_smb2_tree_connect_state *state =
 400                 tevent_req_data(req,
 401                 struct smbd_smb2_tree_connect_state);
 402         NTSTATUS status;
 403
 404         if (tevent_req_is_nterror(req, &status)) {
 405                 tevent_req_received(req);
 406                 return status;
 407         }
 408
 409         *out_share_type = state->out_share_type;
 410         *out_share_flags = state->out_share_flags;
 411         *out_capabilities = state->out_capabilities;
 412         *out_maximal_access = state->out_maximal_access;
 413         *out_tree_id = state->out_tree_id;
 414
 415         tevent_req_received(req);
 416         return NT_STATUS_OK;
 417 }
 418
 419 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 420                                         struct tevent_context *ev,
 421                                         struct smbd_smb2_request *smb2req);
 422 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
 423 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
 424
 425 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 426 {
 427         NTSTATUS status;
 428         struct tevent_req *subreq = NULL;
 429
 430         status = smbd_smb2_request_verify_sizes(req, 0x04);
 431         if (!NT_STATUS_IS_OK(status)) {
 432                 return smbd_smb2_request_error(req, status);
 433         }
 434
 435         subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
 436         if (subreq == NULL) {
 437                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 438         }
 439         tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
 440
 441         /*
 442          * Wait a long time before going async on this to allow
 443          * requests we're waiting on to finish. Set timeout to 10 secs.
 444          */
 445         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 446 }
 447
 448 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
 449 {
 450         struct smbd_smb2_request *smb2req =
 451                 tevent_req_callback_data(subreq,
 452                 struct smbd_smb2_request);
 453         DATA_BLOB outbody;
 454         NTSTATUS status;
 455         NTSTATUS error;
 456
 457         status = smbd_smb2_tdis_recv(subreq);
 458         TALLOC_FREE(subreq);
 459         if (!NT_STATUS_IS_OK(status)) {
 460                 error = smbd_smb2_request_error(smb2req, status);
 461                 if (!NT_STATUS_IS_OK(error)) {
 462                         smbd_server_connection_terminate(smb2req->xconn,
 463                                                         nt_errstr(error));
 464                         return;
 465                 }
 466                 return;
 467         }
 468
 469         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 470         if (outbody.data == NULL) {
 471                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 472                 if (!NT_STATUS_IS_OK(error)) {
 473                         smbd_server_connection_terminate(smb2req->xconn,
 474                                                         nt_errstr(error));
 475                         return;
 476                 }
 477                 return;
 478         }
 479
 480         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 481         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 482
 483         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 484         if (!NT_STATUS_IS_OK(error)) {
 485                 smbd_server_connection_terminate(smb2req->xconn,
 486                                                 nt_errstr(error));
 487                 return;
 488         }
 489 }
 490
 491 struct smbd_smb2_tdis_state {
 492         struct smbd_smb2_request *smb2req;
 493         struct tevent_queue *wait_queue;
 494 };
 495
 496 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
 497
 498 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 499                                         struct tevent_context *ev,
 500                                         struct smbd_smb2_request *smb2req)
 501 {
 502         struct tevent_req *req;
 503         struct smbd_smb2_tdis_state *state;
 504         struct tevent_req *subreq;
 505         struct smbd_smb2_request *preq;
 506         struct smbXsrv_connection *xconn = smb2req->xconn;
 507
 508         req = tevent_req_create(mem_ctx, &state,
 509                         struct smbd_smb2_tdis_state);
 510         if (req == NULL) {
 511                 return NULL;
 512         }
 513         state->smb2req = smb2req;
 514
 515         state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
 516         if (tevent_req_nomem(state->wait_queue, req)) {
 517                 return tevent_req_post(req, ev);
 518         }
 519
 520         /*
 521          * Make sure that no new request will be able to use this tcon.
 522          */
 523         smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 524
 525         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 526                 if (preq == smb2req) {
 527                         /* Can't cancel current request. */
 528                         continue;
 529                 }
 530                 if (preq->tcon != smb2req->tcon) {
 531                         /* Request on different tcon. */
 532                         continue;
 533                 }
 534
 535                 /*
 536                  * Never cancel anything in a compound
 537                  * request. Way too hard to deal with
 538                  * the result.
 539                  */
 540                 if (!preq->compound_related && preq->subreq != NULL) {
 541                         tevent_req_cancel(preq->subreq);
 542                 }
 543
 544                 /*
 545                  * Now wait until the request is finished.
 546                  *
 547                  * We don't set a callback, as we just want to block the
 548                  * wait queue and the talloc_free() of the request will
 549                  * remove the item from the wait queue.
 550                  */
 551                 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 552                 if (tevent_req_nomem(subreq, req)) {
 553                         return tevent_req_post(req, ev);
 554                 }
 555         }
 556
 557         /*
 558          * Now we add our own waiter to the end of the queue,
 559          * this way we get notified when all pending requests are finished
 560          * and send to the socket.
 561          */
 562         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 563         if (tevent_req_nomem(subreq, req)) {
 564                 return tevent_req_post(req, ev);
 565         }
 566         tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
 567
 568         return req;
 569 }
 570
 571 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
 572 {
 573         struct tevent_req *req = tevent_req_callback_data(
 574                 subreq, struct tevent_req);
 575         struct smbd_smb2_tdis_state *state = tevent_req_data(
 576                 req, struct smbd_smb2_tdis_state);
 577         NTSTATUS status;
 578
 579         tevent_queue_wait_recv(subreq);
 580         TALLOC_FREE(subreq);
 581
 582         /*
 583          * As we've been awoken, we may have changed
 584          * uid in the meantime. Ensure we're still
 585          * root (SMB2_OP_TDIS has .as_root = true).
 586          */
 587         change_to_root_user();
 588
 589         status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
 590                                          state->smb2req->tcon->compat->vuid);
 591         if (tevent_req_nterror(req, status)) {
 592                 return;
 593         }
 594
 595         /* We did tear down the tcon. */
 596         TALLOC_FREE(state->smb2req->tcon);
 597         tevent_req_done(req);
 598 }
 599
 600 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
 601 {
 602         return tevent_req_simple_recv_ntstatus(req);
 603 }