source3/smbd/smb2_sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../auth/gensec/gensec.h"
  27 #include "auth.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "../libcli/security/security.h"
  30 #include "../lib/util/tevent_ntstatus.h"
  31
  32 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
  33                                         struct tevent_context *ev,
  34                                         struct smbd_smb2_request *smb2req,
  35                                         uint64_t in_session_id,
  36                                         uint8_t in_flags,
  37                                         uint8_t in_security_mode,
  38                                         uint64_t in_previous_session_id,
  39                                         DATA_BLOB in_security_buffer);
  40 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
  41                                         uint16_t *out_session_flags,
  42                                         TALLOC_CTX *mem_ctx,
  43                                         DATA_BLOB *out_security_buffer,
  44                                         uint64_t *out_session_id);
  45
  46 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq);
  47
  48 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  49 {
  50         const uint8_t *inhdr;
  51         const uint8_t *inbody;
  52         int i = smb2req->current_idx;
  53         uint64_t in_session_id;
  54         uint8_t in_flags;
  55         uint8_t in_security_mode;
  56         uint64_t in_previous_session_id;
  57         uint16_t in_security_offset;
  58         uint16_t in_security_length;
  59         DATA_BLOB in_security_buffer;
  60         NTSTATUS status;
  61         struct tevent_req *subreq;
  62
  63         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  64         if (!NT_STATUS_IS_OK(status)) {
  65                 return smbd_smb2_request_error(smb2req, status);
  66         }
  67         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  68         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  69
  70         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  71
  72         in_flags = CVAL(inbody, 0x02);
  73         in_security_mode = CVAL(inbody, 0x03);
  74         /* Capabilities = IVAL(inbody, 0x04) */
  75         /* Channel = IVAL(inbody, 0x08) */
  76         in_security_offset = SVAL(inbody, 0x0C);
  77         in_security_length = SVAL(inbody, 0x0E);
  78         in_previous_session_id = BVAL(inbody, 0x10);
  79
  80         if (in_security_offset != (SMB2_HDR_BODY + smb2req->in.vector[i+1].iov_len)) {
  81                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  82         }
  83
  84         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  85                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  86         }
  87
  88         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  89         in_security_buffer.length = in_security_length;
  90
  91         subreq = smbd_smb2_session_setup_send(smb2req,
  92                                               smb2req->sconn->ev_ctx,
  93                                               smb2req,
  94                                               in_session_id,
  95                                               in_flags,
  96                                               in_security_mode,
  97                                               in_previous_session_id,
  98                                               in_security_buffer);
  99         if (subreq == NULL) {
 100                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 101         }
 102         tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
 103
 104         return smbd_smb2_request_pending_queue(smb2req, subreq, 500);
 105 }
 106
 107 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
 108 {
 109         struct smbd_smb2_request *smb2req =
 110                 tevent_req_callback_data(subreq,
 111                 struct smbd_smb2_request);
 112         int i = smb2req->current_idx;
 113         uint8_t *outhdr;
 114         DATA_BLOB outbody;
 115         DATA_BLOB outdyn;
 116         uint16_t out_session_flags;
 117         uint64_t out_session_id;
 118         uint16_t out_security_offset;
 119         DATA_BLOB out_security_buffer = data_blob_null;
 120         NTSTATUS status;
 121         NTSTATUS error; /* transport error */
 122
 123         status = smbd_smb2_session_setup_recv(subreq,
 124                                               &out_session_flags,
 125                                               smb2req,
 126                                               &out_security_buffer,
 127                                               &out_session_id);
 128         TALLOC_FREE(subreq);
 129         if (!NT_STATUS_IS_OK(status) &&
 130             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 131                 status = nt_status_squash(status);
 132                 error = smbd_smb2_request_error(smb2req, status);
 133                 if (!NT_STATUS_IS_OK(error)) {
 134                         smbd_server_connection_terminate(smb2req->sconn,
 135                                                          nt_errstr(error));
 136                         return;
 137                 }
 138                 return;
 139         }
 140
 141         out_security_offset = SMB2_HDR_BODY + 0x08;
 142
 143         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 144
 145         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 146         if (outbody.data == NULL) {
 147                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 148                 if (!NT_STATUS_IS_OK(error)) {
 149                         smbd_server_connection_terminate(smb2req->sconn,
 150                                                          nt_errstr(error));
 151                         return;
 152                 }
 153                 return;
 154         }
 155
 156         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 157
 158         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 159         SSVAL(outbody.data, 0x02,
 160               out_session_flags);               /* session flags */
 161         SSVAL(outbody.data, 0x04,
 162               out_security_offset);             /* security buffer offset */
 163         SSVAL(outbody.data, 0x06,
 164               out_security_buffer.length);      /* security buffer length */
 165
 166         outdyn = out_security_buffer;
 167
 168         error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 169                                            __location__);
 170         if (!NT_STATUS_IS_OK(error)) {
 171                 smbd_server_connection_terminate(smb2req->sconn,
 172                                                  nt_errstr(error));
 173                 return;
 174         }
 175 }
 176
 177 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 178 {
 179         if (session->sconn == NULL) {
 180                 return 0;
 181         }
 182
 183         file_close_user(session->sconn, session->vuid);
 184
 185         /* first free all tcons */
 186         while (session->tcons.list) {
 187                 talloc_free(session->tcons.list);
 188         }
 189
 190         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 191         invalidate_vuid(session->sconn, session->vuid);
 192
 193         session->vuid = 0;
 194         session->status = NT_STATUS_USER_SESSION_DELETED;
 195         session->sconn = NULL;
 196
 197         session->smbXsrv->compat = NULL;
 198         TALLOC_FREE(session->smbXsrv);
 199
 200         return 0;
 201 }
 202
 203 static NTSTATUS smbd_smb2_auth_generic_return(struct smbd_smb2_session *session,
 204                                         struct smbd_smb2_request *smb2req,
 205                                         uint8_t in_security_mode,
 206                                         uint64_t in_previous_session_id,
 207                                         DATA_BLOB in_security_buffer,
 208                                         uint16_t *out_session_flags,
 209                                         uint64_t *out_session_id)
 210 {
 211         NTSTATUS status;
 212         bool guest = false;
 213         uint8_t session_key[16];
 214         struct smbXsrv_session *x = session->smbXsrv;
 215         struct auth_session_info *session_info = session->session_info;
 216         struct smbXsrv_connection *conn = x->connection;
 217
 218         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 219             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 220                 x->global->signing_required = true;
 221         }
 222
 223         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 224                 /* we map anonymous to guest internally */
 225                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 226                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 227                 /* force no signing */
 228                 x->global->signing_required = false;
 229                 guest = true;
 230         }
 231
 232         ZERO_STRUCT(session_key);
 233         memcpy(session_key, session->session_info->session_key.data,
 234                MIN(session->session_info->session_key.length, sizeof(session_key)));
 235
 236         x->global->signing_key = data_blob_talloc(x->global,
 237                                                   session_key,
 238                                                   sizeof(session_key));
 239         if (x->global->signing_key.data == NULL) {
 240                 ZERO_STRUCT(session_key);
 241                 TALLOC_FREE(session);
 242                 return NT_STATUS_NO_MEMORY;
 243         }
 244
 245         if (conn->protocol >= PROTOCOL_SMB2_24) {
 246                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 247                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 248
 249                 smb2_key_derivation(session_key, sizeof(session_key),
 250                                     label.data, label.length,
 251                                     context.data, context.length,
 252                                     x->global->signing_key.data);
 253         }
 254
 255         x->global->application_key = data_blob_dup_talloc(x->global,
 256                                                 x->global->signing_key);
 257         if (x->global->application_key.data == NULL) {
 258                 ZERO_STRUCT(session_key);
 259                 TALLOC_FREE(session);
 260                 return NT_STATUS_NO_MEMORY;
 261         }
 262
 263         if (conn->protocol >= PROTOCOL_SMB2_24) {
 264                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 265                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 266
 267                 smb2_key_derivation(session_key, sizeof(session_key),
 268                                     label.data, label.length,
 269                                     context.data, context.length,
 270                                     x->global->application_key.data);
 271         }
 272         ZERO_STRUCT(session_key);
 273
 274         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 275                                                 x->global->signing_key);
 276         if (x->global->channels[0].signing_key.data == NULL) {
 277                 TALLOC_FREE(session);
 278                 return NT_STATUS_NO_MEMORY;
 279         }
 280
 281         data_blob_clear_free(&session_info->session_key);
 282         session_info->session_key = data_blob_dup_talloc(session_info,
 283                                                 x->global->application_key);
 284         if (session_info->session_key.data == NULL) {
 285                 TALLOC_FREE(session);
 286                 return NT_STATUS_NO_MEMORY;
 287         }
 288
 289         session->compat_vuser = talloc_zero(session, struct user_struct);
 290         if (session->compat_vuser == NULL) {
 291                 TALLOC_FREE(session);
 292                 return NT_STATUS_NO_MEMORY;
 293         }
 294         session->compat_vuser->gensec_security = session->gensec_security;
 295         session->compat_vuser->homes_snum = -1;
 296         session->compat_vuser->session_info = session->session_info;
 297         session->compat_vuser->session_keystr = NULL;
 298         session->compat_vuser->vuid = session->vuid;
 299         DLIST_ADD(session->sconn->users, session->compat_vuser);
 300         session->sconn->num_users++;
 301
 302         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 303                 session->compat_vuser->homes_snum =
 304                         register_homes_share(session->session_info->unix_info->unix_name);
 305         }
 306
 307         if (!session_claim(session->sconn, session->compat_vuser)) {
 308                 DEBUG(1, ("smb2: Failed to claim session "
 309                         "for vuid=%llu\n",
 310                         (unsigned long long)session->compat_vuser->vuid));
 311                 TALLOC_FREE(session);
 312                 return NT_STATUS_LOGON_FAILURE;
 313         }
 314
 315         set_current_user_info(session->session_info->unix_info->sanitized_username,
 316                               session->session_info->unix_info->unix_name,
 317                               session->session_info->info->domain_name);
 318
 319         reload_services(smb2req->sconn, conn_snum_used, true);
 320
 321         session->smbXsrv->status = NT_STATUS_OK;
 322         session->smbXsrv->global->auth_session_info = session->session_info;
 323         session->smbXsrv->global->auth_session_info_seqnum += 1;
 324         session->smbXsrv->global->channels[0].auth_session_info_seqnum =
 325                 session->smbXsrv->global->auth_session_info_seqnum;
 326
 327         status = smbXsrv_session_update(session->smbXsrv);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 330                           (unsigned long long)session->compat_vuser->vuid,
 331                           nt_errstr(status)));
 332                 TALLOC_FREE(session);
 333                 return NT_STATUS_LOGON_FAILURE;
 334         }
 335
 336         session->status = NT_STATUS_OK;
 337
 338         /*
 339          * we attach the session to the request
 340          * so that the response can be signed
 341          */
 342         smb2req->session = session;
 343         if (!guest) {
 344                 smb2req->do_signing = true;
 345         }
 346
 347         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 348
 349         *out_session_id = session->vuid;
 350
 351         return NT_STATUS_OK;
 352 }
 353
 354 static NTSTATUS smbd_smb2_auth_generic(struct smbd_smb2_session *session,
 355                                        struct smbd_smb2_request *smb2req,
 356                                        uint8_t in_security_mode,
 357                                        uint64_t in_previous_session_id,
 358                                        DATA_BLOB in_security_buffer,
 359                                        uint16_t *out_session_flags,
 360                                        DATA_BLOB *out_security_buffer,
 361                                        uint64_t *out_session_id)
 362 {
 363         NTSTATUS status;
 364
 365         *out_security_buffer = data_blob_null;
 366
 367         if (session->gensec_security == NULL) {
 368                 status = auth_generic_prepare(session, session->sconn->remote_address,
 369                                             &session->gensec_security);
 370                 if (!NT_STATUS_IS_OK(status)) {
 371                         TALLOC_FREE(session);
 372                         return status;
 373                 }
 374
 375                 gensec_want_feature(session->gensec_security, GENSEC_FEATURE_SESSION_KEY);
 376                 gensec_want_feature(session->gensec_security, GENSEC_FEATURE_UNIX_TOKEN);
 377
 378                 status = gensec_start_mech_by_oid(session->gensec_security, GENSEC_OID_SPNEGO);
 379                 if (!NT_STATUS_IS_OK(status)) {
 380                         TALLOC_FREE(session);
 381                         return status;
 382                 }
 383         }
 384
 385         become_root();
 386         status = gensec_update(session->gensec_security,
 387                                smb2req, NULL,
 388                                in_security_buffer,
 389                                out_security_buffer);
 390         unbecome_root();
 391         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 392             !NT_STATUS_IS_OK(status)) {
 393                 TALLOC_FREE(session);
 394                 return nt_status_squash(status);
 395         }
 396
 397         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 398                 *out_session_id = session->vuid;
 399                 return status;
 400         }
 401
 402         status = gensec_session_info(session->gensec_security,
 403                                      session,
 404                                      &session->session_info);
 405
 406         if (!NT_STATUS_IS_OK(status)) {
 407                 TALLOC_FREE(session);
 408                 return status;
 409         }
 410         *out_session_id = session->vuid;
 411
 412         return smbd_smb2_auth_generic_return(session,
 413                                              smb2req,
 414                                              in_security_mode,
 415                                              in_previous_session_id,
 416                                              in_security_buffer,
 417                                              out_session_flags,
 418                                              out_session_id);
 419 }
 420
 421 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 422                                         uint64_t in_session_id,
 423                                         uint8_t in_flags,
 424                                         uint8_t in_security_mode,
 425                                         uint64_t in_previous_session_id,
 426                                         DATA_BLOB in_security_buffer,
 427                                         uint16_t *out_session_flags,
 428                                         DATA_BLOB *out_security_buffer,
 429                                         uint64_t *out_session_id)
 430 {
 431         struct smbd_smb2_session *smb2sess;
 432         struct smbXsrv_session *session;
 433         NTSTATUS status;
 434         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 435
 436         *out_session_flags = 0;
 437         *out_session_id = 0;
 438
 439         if (in_session_id == 0) {
 440                 /* create a new session */
 441                 smb2sess = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 442                 if (smb2sess == NULL) {
 443                         return NT_STATUS_NO_MEMORY;
 444                 }
 445
 446                 status = smbXsrv_session_create(smb2req->sconn->conn,
 447                                                 now, &session);
 448                 if (!NT_STATUS_IS_OK(status)) {
 449                         return status;
 450                 }
 451                 smb2sess->smbXsrv = session;
 452                 session->smb2sess = smb2sess;
 453                 talloc_set_destructor(smb2sess, smbd_smb2_session_destructor);
 454
 455                 smb2sess->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 456                 smb2sess->vuid = session->global->session_wire_id;
 457
 458                 smb2sess->tcons.idtree = idr_init(smb2sess);
 459                 if (smb2sess->tcons.idtree == NULL) {
 460                         return NT_STATUS_NO_MEMORY;
 461                 }
 462                 smb2sess->tcons.limit = 0x0000FFFE;
 463                 smb2sess->tcons.list = NULL;
 464
 465                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, smb2sess,
 466                               struct smbd_smb2_session *);
 467                 smb2sess->sconn = smb2req->sconn;
 468         } else {
 469                 status = smb2srv_session_lookup(smb2req->sconn->conn,
 470                                                 in_session_id, now,
 471                                                 &session);
 472                 if (NT_STATUS_IS_OK(status)) {
 473                         return NT_STATUS_REQUEST_NOT_ACCEPTED;
 474                 }
 475                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 476
 477                         return status;
 478                 }
 479
 480                 smb2sess = session->smb2sess;
 481         }
 482
 483         if (NT_STATUS_IS_OK(smb2sess->status)) {
 484                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 485         }
 486
 487         return smbd_smb2_auth_generic(smb2sess,
 488                                       smb2req,
 489                                       in_security_mode,
 490                                       in_previous_session_id,
 491                                       in_security_buffer,
 492                                       out_session_flags,
 493                                       out_security_buffer,
 494                                       out_session_id);
 495 }
 496
 497 struct smbd_smb2_session_setup_state {
 498         struct tevent_context *ev;
 499         struct smbd_smb2_request *smb2req;
 500         uint64_t in_session_id;
 501         uint8_t in_flags;
 502         uint8_t in_security_mode;
 503         uint64_t in_previous_session_id;
 504         DATA_BLOB in_security_buffer;
 505         uint16_t out_session_flags;
 506         DATA_BLOB out_security_buffer;
 507         uint64_t out_session_id;
 508 };
 509
 510 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 511                                         struct tevent_context *ev,
 512                                         struct smbd_smb2_request *smb2req,
 513                                         uint64_t in_session_id,
 514                                         uint8_t in_flags,
 515                                         uint8_t in_security_mode,
 516                                         uint64_t in_previous_session_id,
 517                                         DATA_BLOB in_security_buffer)
 518 {
 519         struct tevent_req *req;
 520         struct smbd_smb2_session_setup_state *state;
 521         NTSTATUS status;
 522
 523         req = tevent_req_create(mem_ctx, &state,
 524                                 struct smbd_smb2_session_setup_state);
 525         if (req == NULL) {
 526                 return NULL;
 527         }
 528         state->ev = ev;
 529         state->smb2req = smb2req;
 530         state->in_session_id = in_session_id;
 531         state->in_flags = in_flags;
 532         state->in_security_mode = in_security_mode;
 533         state->in_previous_session_id = in_previous_session_id;
 534         state->in_security_buffer = in_security_buffer;
 535
 536         status = smbd_smb2_session_setup(smb2req,
 537                                          in_session_id,
 538                                          in_flags,
 539                                          in_security_mode,
 540                                          in_previous_session_id,
 541                                          in_security_buffer,
 542                                          &state->out_session_flags,
 543                                          &state->out_security_buffer,
 544                                          &state->out_session_id);
 545         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) ||
 546             NT_STATUS_IS_OK(status))
 547         {
 548                 talloc_steal(state, state->out_security_buffer.data);
 549         }
 550         if (tevent_req_nterror(req, status)) {
 551                 return tevent_req_post(req, ev);
 552         }
 553
 554         tevent_req_done(req);
 555         return tevent_req_post(req, ev);
 556 }
 557
 558 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 559                                         uint16_t *out_session_flags,
 560                                         TALLOC_CTX *mem_ctx,
 561                                         DATA_BLOB *out_security_buffer,
 562                                         uint64_t *out_session_id)
 563 {
 564         struct smbd_smb2_session_setup_state *state =
 565                 tevent_req_data(req,
 566                 struct smbd_smb2_session_setup_state);
 567         NTSTATUS status;
 568
 569         if (tevent_req_is_nterror(req, &status)) {
 570                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 571                         tevent_req_received(req);
 572                         return nt_status_squash(status);
 573                 }
 574         } else {
 575                 status = NT_STATUS_OK;
 576         }
 577
 578         *out_session_flags = state->out_session_flags;
 579         *out_security_buffer = state->out_security_buffer;
 580         *out_session_id = state->out_session_id;
 581
 582         talloc_steal(mem_ctx, out_security_buffer->data);
 583         tevent_req_received(req);
 584         return status;
 585 }
 586
 587 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 588 {
 589         NTSTATUS status;
 590         DATA_BLOB outbody;
 591
 592         status = smbd_smb2_request_verify_sizes(req, 0x04);
 593         if (!NT_STATUS_IS_OK(status)) {
 594                 return smbd_smb2_request_error(req, status);
 595         }
 596
 597         /*
 598          * TODO: cancel all outstanding requests on the session
 599          *       and delete all tree connections.
 600          */
 601         smbd_smb2_session_destructor(req->session);
 602         /*
 603          * we may need to sign the response, so we need to keep
 604          * the session until the response is sent to the wire.
 605          */
 606         talloc_steal(req, req->session);
 607
 608         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 609         if (outbody.data == NULL) {
 610                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 611         }
 612
 613         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 614         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 615
 616         return smbd_smb2_request_done(req, outbody, NULL);
 617 }