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                                             bool *disconnect);
  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         bool disconnect = false;
 118         NTSTATUS status;
 119         NTSTATUS error;
 120
 121         status = smbd_smb2_tree_connect_recv(subreq,
 122                                              &out_share_type,
 123                                              &out_share_flags,
 124                                              &out_capabilities,
 125                                              &out_maximal_access,
 126                                              &out_tree_id,
 127                                              &disconnect);
 128         TALLOC_FREE(subreq);
 129         if (!NT_STATUS_IS_OK(status)) {
 130                 if (disconnect) {
 131                         smbd_server_connection_terminate(req->xconn,
 132                                                          nt_errstr(status));
 133                         return;
 134                 }
 135                 error = smbd_smb2_request_error(req, status);
 136                 if (!NT_STATUS_IS_OK(error)) {
 137                         smbd_server_connection_terminate(req->xconn,
 138                                                          nt_errstr(error));
 139                         return;
 140                 }
 141                 return;
 142         }
 143
 144         outhdr = SMBD_SMB2_OUT_HDR_PTR(req);
 145
 146         outbody = smbd_smb2_generate_outbody(req, 0x10);
 147         if (outbody.data == NULL) {
 148                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 149                 if (!NT_STATUS_IS_OK(error)) {
 150                         smbd_server_connection_terminate(req->xconn,
 151                                                          nt_errstr(error));
 152                         return;
 153                 }
 154                 return;
 155         }
 156
 157         SIVAL(outhdr, SMB2_HDR_TID, out_tree_id);
 158
 159         SSVAL(outbody.data, 0x00, 0x10);        /* struct size */
 160         SCVAL(outbody.data, 0x02,
 161               out_share_type);                  /* share type */
 162         SCVAL(outbody.data, 0x03, 0);           /* reserved */
 163         SIVAL(outbody.data, 0x04,
 164               out_share_flags);                 /* share flags */
 165         SIVAL(outbody.data, 0x08,
 166               out_capabilities);                /* capabilities */
 167         SIVAL(outbody.data, 0x0C,
 168               out_maximal_access);              /* maximal access */
 169
 170         error = smbd_smb2_request_done(req, outbody, NULL);
 171         if (!NT_STATUS_IS_OK(error)) {
 172                 smbd_server_connection_terminate(req->xconn,
 173                                                  nt_errstr(error));
 174                 return;
 175         }
 176 }
 177
 178 static NTSTATUS smbd_smb2_tree_connect(struct smbd_smb2_request *req,
 179                                        const char *in_path,
 180                                        uint8_t *out_share_type,
 181                                        uint32_t *out_share_flags,
 182                                        uint32_t *out_capabilities,
 183                                        uint32_t *out_maximal_access,
 184                                        uint32_t *out_tree_id,
 185                                        bool *disconnect)
 186 {
 187         struct smbXsrv_connection *conn = req->xconn;
 188         const char *share = in_path;
 189         char *service = NULL;
 190         int snum = -1;
 191         struct smbXsrv_tcon *tcon;
 192         NTTIME now = timeval_to_nttime(&req->request_time);
 193         connection_struct *compat_conn = NULL;
 194         struct user_struct *compat_vuser = req->session->compat;
 195         NTSTATUS status;
 196         bool encryption_desired = req->session->global->encryption_flags & SMBXSRV_ENCRYPTION_DESIRED;
 197         bool encryption_required = req->session->global->encryption_flags & SMBXSRV_ENCRYPTION_REQUIRED;
 198         bool guest_session = false;
 199         bool require_signed_tcon = false;
 200
 201         *disconnect = false;
 202
 203         if (strncmp(share, "\\\\", 2) == 0) {
 204                 const char *p = strchr(share+2, '\\');
 205                 if (p) {
 206                         share = p + 1;
 207                 }
 208         }
 209
 210         DEBUG(10,("smbd_smb2_tree_connect: path[%s] share[%s]\n",
 211                   in_path, share));
 212
 213         if (security_session_user_level(compat_vuser->session_info, NULL) < SECURITY_USER) {
 214                 guest_session = true;
 215         }
 216
 217         if (conn->protocol >= PROTOCOL_SMB3_11 && !guest_session) {
 218                 require_signed_tcon = true;
 219         }
 220
 221         if (require_signed_tcon && !req->do_encryption && !req->do_signing) {
 222                 DEBUG(1, ("smbd_smb2_tree_connect: reject request to share "
 223                           "[%s] as '%s\\%s' without encryption or signing. "
 224                           "Disconnecting.\n",
 225                           share,
 226                           req->session->global->auth_session_info->info->domain_name,
 227                           req->session->global->auth_session_info->info->account_name));
 228                 *disconnect = true;
 229                 return NT_STATUS_ACCESS_DENIED;
 230         }
 231
 232         service = talloc_strdup(talloc_tos(), share);
 233         if(!service) {
 234                 return NT_STATUS_NO_MEMORY;
 235         }
 236
 237         if (!strlower_m(service)) {
 238                 DEBUG(2, ("strlower_m %s failed\n", service));
 239                 return NT_STATUS_INVALID_PARAMETER;
 240         }
 241
 242         /* TODO: do more things... */
 243         if (strequal(service,HOMES_NAME)) {
 244                 if (compat_vuser->homes_snum == -1) {
 245                         DEBUG(2, ("[homes] share not available for "
 246                                 "user %s because it was not found "
 247                                 "or created at session setup "
 248                                 "time\n",
 249                                 compat_vuser->session_info->unix_info->unix_name));
 250                         return NT_STATUS_BAD_NETWORK_NAME;
 251                 }
 252                 snum = compat_vuser->homes_snum;
 253         } else if ((compat_vuser->homes_snum != -1)
 254                    && strequal(service,
 255                         lp_servicename(talloc_tos(), compat_vuser->homes_snum))) {
 256                 snum = compat_vuser->homes_snum;
 257         } else {
 258                 snum = find_service(talloc_tos(), service, &service);
 259                 if (!service) {
 260                         return NT_STATUS_NO_MEMORY;
 261                 }
 262         }
 263
 264         if (snum < 0) {
 265                 DEBUG(3,("smbd_smb2_tree_connect: couldn't find service %s\n",
 266                          service));
 267                 return NT_STATUS_BAD_NETWORK_NAME;
 268         }
 269
 270         if ((lp_smb_encrypt(snum) >= SMB_SIGNING_DESIRED) &&
 271             (conn->smb2.server.cipher != 0))
 272         {
 273                 encryption_desired = true;
 274         }
 275
 276         if (lp_smb_encrypt(snum) == SMB_SIGNING_REQUIRED) {
 277                 encryption_desired = true;
 278                 encryption_required = true;
 279         }
 280
 281         if (guest_session && encryption_required) {
 282                 DEBUG(1,("reject guest as encryption is required for service %s\n",
 283                          service));
 284                 return NT_STATUS_ACCESS_DENIED;
 285         }
 286
 287         if (conn->smb2.server.cipher == 0) {
 288                 if (encryption_required) {
 289                         DEBUG(1,("reject tcon with dialect[0x%04X] "
 290                                  "as encryption is required for service %s\n",
 291                                  conn->smb2.server.dialect, service));
 292                         return NT_STATUS_ACCESS_DENIED;
 293                 }
 294         }
 295
 296         /* create a new tcon as child of the session */
 297         status = smb2srv_tcon_create(req->session, now, &tcon);
 298         if (!NT_STATUS_IS_OK(status)) {
 299                 return status;
 300         }
 301
 302         if (encryption_desired) {
 303                 tcon->global->encryption_flags |= SMBXSRV_ENCRYPTION_DESIRED;
 304         }
 305         if (encryption_required) {
 306                 tcon->global->encryption_flags |= SMBXSRV_ENCRYPTION_REQUIRED;
 307         }
 308
 309         compat_conn = make_connection_smb2(req,
 310                                         tcon, snum,
 311                                         req->session->compat,
 312                                         "???",
 313                                         &status);
 314         if (compat_conn == NULL) {
 315                 TALLOC_FREE(tcon);
 316                 return status;
 317         }
 318
 319         tcon->global->share_name = lp_servicename(tcon->global,
 320                                                   SNUM(compat_conn));
 321         if (tcon->global->share_name == NULL) {
 322                 conn_free(compat_conn);
 323                 TALLOC_FREE(tcon);
 324                 return NT_STATUS_NO_MEMORY;
 325         }
 326         tcon->global->session_global_id =
 327                 req->session->global->session_global_id;
 328
 329         tcon->compat = talloc_move(tcon, &compat_conn);
 330
 331         tcon->status = NT_STATUS_OK;
 332
 333         status = smbXsrv_tcon_update(tcon);
 334         if (!NT_STATUS_IS_OK(status)) {
 335                 TALLOC_FREE(tcon);
 336                 return status;
 337         }
 338
 339         if (IS_PRINT(tcon->compat)) {
 340                 *out_share_type = SMB2_SHARE_TYPE_PRINT;
 341         } else if (IS_IPC(tcon->compat)) {
 342                 *out_share_type = SMB2_SHARE_TYPE_PIPE;
 343         } else {
 344                 *out_share_type = SMB2_SHARE_TYPE_DISK;
 345         }
 346
 347         *out_share_flags = 0;
 348
 349         if (lp_msdfs_root(SNUM(tcon->compat)) && lp_host_msdfs()) {
 350                 *out_share_flags |= (SMB2_SHAREFLAG_DFS|SMB2_SHAREFLAG_DFS_ROOT);
 351                 *out_capabilities = SMB2_SHARE_CAP_DFS;
 352         } else {
 353                 *out_capabilities = 0;
 354         }
 355
 356         switch(lp_csc_policy(SNUM(tcon->compat))) {
 357         case CSC_POLICY_MANUAL:
 358                 break;
 359         case CSC_POLICY_DOCUMENTS:
 360                 *out_share_flags |= SMB2_SHAREFLAG_AUTO_CACHING;
 361                 break;
 362         case CSC_POLICY_PROGRAMS:
 363                 *out_share_flags |= SMB2_SHAREFLAG_VDO_CACHING;
 364                 break;
 365         case CSC_POLICY_DISABLE:
 366                 *out_share_flags |= SMB2_SHAREFLAG_NO_CACHING;
 367                 break;
 368         default:
 369                 break;
 370         }
 371
 372         if (lp_hide_unreadable(SNUM(tcon->compat)) ||
 373             lp_hide_unwriteable_files(SNUM(tcon->compat))) {
 374                 *out_share_flags |= SMB2_SHAREFLAG_ACCESS_BASED_DIRECTORY_ENUM;
 375         }
 376
 377         if (encryption_desired) {
 378                 *out_share_flags |= SMB2_SHAREFLAG_ENCRYPT_DATA;
 379         }
 380
 381         *out_maximal_access = tcon->compat->share_access;
 382
 383         *out_tree_id = tcon->global->tcon_wire_id;
 384         req->last_tid = tcon->global->tcon_wire_id;
 385
 386         return NT_STATUS_OK;
 387 }
 388
 389 struct smbd_smb2_tree_connect_state {
 390         const char *in_path;
 391         uint8_t out_share_type;
 392         uint32_t out_share_flags;
 393         uint32_t out_capabilities;
 394         uint32_t out_maximal_access;
 395         uint32_t out_tree_id;
 396         bool disconnect;
 397 };
 398
 399 static struct tevent_req *smbd_smb2_tree_connect_send(TALLOC_CTX *mem_ctx,
 400                                         struct tevent_context *ev,
 401                                         struct smbd_smb2_request *smb2req,
 402                                         const char *in_path)
 403 {
 404         struct tevent_req *req;
 405         struct smbd_smb2_tree_connect_state *state;
 406         NTSTATUS status;
 407
 408         req = tevent_req_create(mem_ctx, &state,
 409                                 struct smbd_smb2_tree_connect_state);
 410         if (req == NULL) {
 411                 return NULL;
 412         }
 413         state->in_path = in_path;
 414
 415         status = smbd_smb2_tree_connect(smb2req,
 416                                         state->in_path,
 417                                         &state->out_share_type,
 418                                         &state->out_share_flags,
 419                                         &state->out_capabilities,
 420                                         &state->out_maximal_access,
 421                                         &state->out_tree_id,
 422                                         &state->disconnect);
 423         if (tevent_req_nterror(req, status)) {
 424                 return tevent_req_post(req, ev);
 425         }
 426
 427         tevent_req_done(req);
 428         return tevent_req_post(req, ev);
 429 }
 430
 431 static NTSTATUS smbd_smb2_tree_connect_recv(struct tevent_req *req,
 432                                             uint8_t *out_share_type,
 433                                             uint32_t *out_share_flags,
 434                                             uint32_t *out_capabilities,
 435                                             uint32_t *out_maximal_access,
 436                                             uint32_t *out_tree_id,
 437                                             bool *disconnect)
 438 {
 439         struct smbd_smb2_tree_connect_state *state =
 440                 tevent_req_data(req,
 441                 struct smbd_smb2_tree_connect_state);
 442         NTSTATUS status;
 443
 444         if (tevent_req_is_nterror(req, &status)) {
 445                 tevent_req_received(req);
 446                 return status;
 447         }
 448
 449         *out_share_type = state->out_share_type;
 450         *out_share_flags = state->out_share_flags;
 451         *out_capabilities = state->out_capabilities;
 452         *out_maximal_access = state->out_maximal_access;
 453         *out_tree_id = state->out_tree_id;
 454         *disconnect = state->disconnect;
 455
 456         tevent_req_received(req);
 457         return NT_STATUS_OK;
 458 }
 459
 460 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 461                                         struct tevent_context *ev,
 462                                         struct smbd_smb2_request *smb2req);
 463 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req);
 464 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq);
 465
 466 NTSTATUS smbd_smb2_request_process_tdis(struct smbd_smb2_request *req)
 467 {
 468         NTSTATUS status;
 469         struct tevent_req *subreq = NULL;
 470
 471         status = smbd_smb2_request_verify_sizes(req, 0x04);
 472         if (!NT_STATUS_IS_OK(status)) {
 473                 return smbd_smb2_request_error(req, status);
 474         }
 475
 476         subreq = smbd_smb2_tdis_send(req, req->sconn->ev_ctx, req);
 477         if (subreq == NULL) {
 478                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 479         }
 480         tevent_req_set_callback(subreq, smbd_smb2_request_tdis_done, req);
 481
 482         /*
 483          * Wait a long time before going async on this to allow
 484          * requests we're waiting on to finish. Set timeout to 10 secs.
 485          */
 486         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 487 }
 488
 489 static void smbd_smb2_request_tdis_done(struct tevent_req *subreq)
 490 {
 491         struct smbd_smb2_request *smb2req =
 492                 tevent_req_callback_data(subreq,
 493                 struct smbd_smb2_request);
 494         DATA_BLOB outbody;
 495         NTSTATUS status;
 496         NTSTATUS error;
 497
 498         status = smbd_smb2_tdis_recv(subreq);
 499         TALLOC_FREE(subreq);
 500         if (!NT_STATUS_IS_OK(status)) {
 501                 error = smbd_smb2_request_error(smb2req, status);
 502                 if (!NT_STATUS_IS_OK(error)) {
 503                         smbd_server_connection_terminate(smb2req->xconn,
 504                                                         nt_errstr(error));
 505                         return;
 506                 }
 507                 return;
 508         }
 509
 510         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 511         if (outbody.data == NULL) {
 512                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 513                 if (!NT_STATUS_IS_OK(error)) {
 514                         smbd_server_connection_terminate(smb2req->xconn,
 515                                                         nt_errstr(error));
 516                         return;
 517                 }
 518                 return;
 519         }
 520
 521         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 522         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 523
 524         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 525         if (!NT_STATUS_IS_OK(error)) {
 526                 smbd_server_connection_terminate(smb2req->xconn,
 527                                                 nt_errstr(error));
 528                 return;
 529         }
 530 }
 531
 532 struct smbd_smb2_tdis_state {
 533         struct smbd_smb2_request *smb2req;
 534         struct tevent_queue *wait_queue;
 535 };
 536
 537 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq);
 538
 539 static struct tevent_req *smbd_smb2_tdis_send(TALLOC_CTX *mem_ctx,
 540                                         struct tevent_context *ev,
 541                                         struct smbd_smb2_request *smb2req)
 542 {
 543         struct tevent_req *req;
 544         struct smbd_smb2_tdis_state *state;
 545         struct tevent_req *subreq;
 546         struct smbXsrv_connection *xconn = NULL;
 547
 548         req = tevent_req_create(mem_ctx, &state,
 549                         struct smbd_smb2_tdis_state);
 550         if (req == NULL) {
 551                 return NULL;
 552         }
 553         state->smb2req = smb2req;
 554
 555         state->wait_queue = tevent_queue_create(state, "tdis_wait_queue");
 556         if (tevent_req_nomem(state->wait_queue, req)) {
 557                 return tevent_req_post(req, ev);
 558         }
 559
 560         /*
 561          * Make sure that no new request will be able to use this tcon.
 562          */
 563         smb2req->tcon->status = NT_STATUS_NETWORK_NAME_DELETED;
 564
 565         xconn = smb2req->xconn->client->connections;
 566         for (; xconn != NULL; xconn = xconn->next) {
 567                 struct smbd_smb2_request *preq;
 568
 569                 for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 570                         if (preq == smb2req) {
 571                                 /* Can't cancel current request. */
 572                                 continue;
 573                         }
 574                         if (preq->tcon != smb2req->tcon) {
 575                                 /* Request on different tcon. */
 576                                 continue;
 577                         }
 578
 579                         /*
 580                          * Never cancel anything in a compound
 581                          * request. Way too hard to deal with
 582                          * the result.
 583                          */
 584                         if (!preq->compound_related && preq->subreq != NULL) {
 585                                 tevent_req_cancel(preq->subreq);
 586                         }
 587
 588                         /*
 589                          * Now wait until the request is finished.
 590                          *
 591                          * We don't set a callback, as we just want to block the
 592                          * wait queue and the talloc_free() of the request will
 593                          * remove the item from the wait queue.
 594                          */
 595                         subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 596                         if (tevent_req_nomem(subreq, req)) {
 597                                 return tevent_req_post(req, ev);
 598                         }
 599                 }
 600         }
 601
 602         /*
 603          * Now we add our own waiter to the end of the queue,
 604          * this way we get notified when all pending requests are finished
 605          * and send to the socket.
 606          */
 607         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 608         if (tevent_req_nomem(subreq, req)) {
 609                 return tevent_req_post(req, ev);
 610         }
 611         tevent_req_set_callback(subreq, smbd_smb2_tdis_wait_done, req);
 612
 613         return req;
 614 }
 615
 616 static void smbd_smb2_tdis_wait_done(struct tevent_req *subreq)
 617 {
 618         struct tevent_req *req = tevent_req_callback_data(
 619                 subreq, struct tevent_req);
 620         struct smbd_smb2_tdis_state *state = tevent_req_data(
 621                 req, struct smbd_smb2_tdis_state);
 622         NTSTATUS status;
 623
 624         tevent_queue_wait_recv(subreq);
 625         TALLOC_FREE(subreq);
 626
 627         /*
 628          * As we've been awoken, we may have changed
 629          * uid in the meantime. Ensure we're still
 630          * root (SMB2_OP_TDIS has .as_root = true).
 631          */
 632         change_to_root_user();
 633
 634         status = smbXsrv_tcon_disconnect(state->smb2req->tcon,
 635                                          state->smb2req->tcon->compat->vuid);
 636         if (tevent_req_nterror(req, status)) {
 637                 return;
 638         }
 639
 640         /* We did tear down the tcon. */
 641         TALLOC_FREE(state->smb2req->tcon);
 642         tevent_req_done(req);
 643 }
 644
 645 static NTSTATUS smbd_smb2_tdis_recv(struct tevent_req *req)
 646 {
 647         return tevent_req_simple_recv_ntstatus(req);
 648 }