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 NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
 178                                         struct smbd_smb2_request *smb2req,
 179                                         uint8_t in_security_mode,
 180                                         uint64_t in_previous_session_id,
 181                                         DATA_BLOB in_security_buffer,
 182                                         uint16_t *out_session_flags,
 183                                         uint64_t *out_session_id)
 184 {
 185         NTSTATUS status;
 186         bool guest = false;
 187         uint8_t session_key[16];
 188         struct smbXsrv_session *x = session;
 189         struct auth_session_info *session_info;
 190         struct smbXsrv_connection *conn = session->connection;
 191
 192         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 193             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 194                 x->global->signing_required = true;
 195         }
 196
 197         status = gensec_session_info(session->gensec,
 198                                      session->global,
 199                                      &session_info);
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 TALLOC_FREE(session);
 202                 return status;
 203         }
 204
 205         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 206                 /* we map anonymous to guest internally */
 207                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 208                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 209                 /* force no signing */
 210                 x->global->signing_required = false;
 211                 guest = true;
 212         }
 213
 214         ZERO_STRUCT(session_key);
 215         memcpy(session_key, session_info->session_key.data,
 216                MIN(session_info->session_key.length, sizeof(session_key)));
 217
 218         x->global->signing_key = data_blob_talloc(x->global,
 219                                                   session_key,
 220                                                   sizeof(session_key));
 221         if (x->global->signing_key.data == NULL) {
 222                 ZERO_STRUCT(session_key);
 223                 TALLOC_FREE(session);
 224                 return NT_STATUS_NO_MEMORY;
 225         }
 226
 227         if (conn->protocol >= PROTOCOL_SMB2_24) {
 228                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 229                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 230
 231                 smb2_key_derivation(session_key, sizeof(session_key),
 232                                     label.data, label.length,
 233                                     context.data, context.length,
 234                                     x->global->signing_key.data);
 235         }
 236
 237         x->global->application_key = data_blob_dup_talloc(x->global,
 238                                                 x->global->signing_key);
 239         if (x->global->application_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("SMB2APP");
 247                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 248
 249                 smb2_key_derivation(session_key, sizeof(session_key),
 250                                     label.data, label.length,
 251                                     context.data, context.length,
 252                                     x->global->application_key.data);
 253         }
 254         ZERO_STRUCT(session_key);
 255
 256         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 257                                                 x->global->signing_key);
 258         if (x->global->channels[0].signing_key.data == NULL) {
 259                 TALLOC_FREE(session);
 260                 return NT_STATUS_NO_MEMORY;
 261         }
 262
 263         data_blob_clear_free(&session_info->session_key);
 264         session_info->session_key = data_blob_dup_talloc(session_info,
 265                                                 x->global->application_key);
 266         if (session_info->session_key.data == NULL) {
 267                 TALLOC_FREE(session);
 268                 return NT_STATUS_NO_MEMORY;
 269         }
 270
 271         session->compat = talloc_zero(session, struct user_struct);
 272         if (session->compat == NULL) {
 273                 TALLOC_FREE(session);
 274                 return NT_STATUS_NO_MEMORY;
 275         }
 276         session->compat->session = session;
 277         session->compat->homes_snum = -1;
 278         session->compat->session_info = session_info;
 279         session->compat->session_keystr = NULL;
 280         session->compat->vuid = session->global->session_wire_id;
 281         DLIST_ADD(smb2req->sconn->users, session->compat);
 282         smb2req->sconn->num_users++;
 283
 284         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 285                 session->compat->homes_snum =
 286                         register_homes_share(session_info->unix_info->unix_name);
 287         }
 288
 289         if (!session_claim(smb2req->sconn, session->compat)) {
 290                 DEBUG(1, ("smb2: Failed to claim session "
 291                         "for vuid=%llu\n",
 292                         (unsigned long long)session->compat->vuid));
 293                 TALLOC_FREE(session);
 294                 return NT_STATUS_LOGON_FAILURE;
 295         }
 296
 297         set_current_user_info(session_info->unix_info->sanitized_username,
 298                               session_info->unix_info->unix_name,
 299                               session_info->info->domain_name);
 300
 301         reload_services(smb2req->sconn, conn_snum_used, true);
 302
 303         session->status = NT_STATUS_OK;
 304         session->global->auth_session_info = session_info;
 305         session->global->auth_session_info_seqnum += 1;
 306         session->global->channels[0].auth_session_info_seqnum =
 307                 session->global->auth_session_info_seqnum;
 308         session->global->expiration_time = gensec_expire_time(session->gensec);
 309
 310         status = smbXsrv_session_update(session);
 311         if (!NT_STATUS_IS_OK(status)) {
 312                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 313                           (unsigned long long)session->compat->vuid,
 314                           nt_errstr(status)));
 315                 TALLOC_FREE(session);
 316                 return NT_STATUS_LOGON_FAILURE;
 317         }
 318
 319         /*
 320          * we attach the session to the request
 321          * so that the response can be signed
 322          */
 323         smb2req->session = session;
 324         if (!guest) {
 325                 smb2req->do_signing = true;
 326         }
 327
 328         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 329
 330         *out_session_id = session->global->session_wire_id;
 331
 332         return NT_STATUS_OK;
 333 }
 334
 335 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 336                                         struct smbd_smb2_request *smb2req,
 337                                         uint16_t *out_session_flags,
 338                                         uint64_t *out_session_id)
 339 {
 340         NTSTATUS status;
 341         struct smbXsrv_session *x = session;
 342         struct auth_session_info *session_info;
 343         struct smbXsrv_connection *conn = session->connection;
 344
 345         status = gensec_session_info(session->gensec,
 346                                      session->global,
 347                                      &session_info);
 348         if (!NT_STATUS_IS_OK(status)) {
 349                 TALLOC_FREE(session);
 350                 return status;
 351         }
 352
 353         data_blob_clear_free(&session_info->session_key);
 354         session_info->session_key = data_blob_dup_talloc(session_info,
 355                                                 x->global->application_key);
 356         if (session_info->session_key.data == NULL) {
 357                 TALLOC_FREE(session);
 358                 return NT_STATUS_NO_MEMORY;
 359         }
 360
 361         session->compat->session_info = session_info;
 362         session->compat->vuid = session->global->session_wire_id;
 363
 364         session->compat->homes_snum =
 365                         register_homes_share(session_info->unix_info->unix_name);
 366
 367         set_current_user_info(session_info->unix_info->sanitized_username,
 368                               session_info->unix_info->unix_name,
 369                               session_info->info->domain_name);
 370
 371         reload_services(smb2req->sconn, conn_snum_used, true);
 372
 373         session->status = NT_STATUS_OK;
 374         TALLOC_FREE(session->global->auth_session_info);
 375         session->global->auth_session_info = session_info;
 376         session->global->auth_session_info_seqnum += 1;
 377         session->global->channels[0].auth_session_info_seqnum =
 378                 session->global->auth_session_info_seqnum;
 379         session->global->expiration_time = gensec_expire_time(session->gensec);
 380
 381         status = smbXsrv_session_update(session);
 382         if (!NT_STATUS_IS_OK(status)) {
 383                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 384                           (unsigned long long)session->compat->vuid,
 385                           nt_errstr(status)));
 386                 TALLOC_FREE(session);
 387                 return NT_STATUS_LOGON_FAILURE;
 388         }
 389
 390         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 391
 392         /*
 393          * we attach the session to the request
 394          * so that the response can be signed
 395          */
 396         smb2req->session = session;
 397         smb2req->do_signing = true;
 398
 399         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 400
 401         *out_session_id = session->global->session_wire_id;
 402
 403         return NT_STATUS_OK;
 404 }
 405
 406 struct smbd_smb2_session_setup_state {
 407         struct tevent_context *ev;
 408         struct smbd_smb2_request *smb2req;
 409         uint64_t in_session_id;
 410         uint8_t in_flags;
 411         uint8_t in_security_mode;
 412         uint64_t in_previous_session_id;
 413         DATA_BLOB in_security_buffer;
 414         struct smbXsrv_session *session;
 415         uint16_t out_session_flags;
 416         DATA_BLOB out_security_buffer;
 417         uint64_t out_session_id;
 418 };
 419
 420 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 421 {
 422         /*
 423          * if state->session is not NULL,
 424          * we remove the session on failure
 425          */
 426         TALLOC_FREE(state->session);
 427         return 0;
 428 }
 429
 430 static void smbd_smb2_session_setup_done(struct tevent_req *subreq);
 431
 432 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 433                                         struct tevent_context *ev,
 434                                         struct smbd_smb2_request *smb2req,
 435                                         uint64_t in_session_id,
 436                                         uint8_t in_flags,
 437                                         uint8_t in_security_mode,
 438                                         uint64_t in_previous_session_id,
 439                                         DATA_BLOB in_security_buffer)
 440 {
 441         struct tevent_req *req;
 442         struct smbd_smb2_session_setup_state *state;
 443         NTSTATUS status;
 444         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 445         struct tevent_req *subreq;
 446
 447         req = tevent_req_create(mem_ctx, &state,
 448                                 struct smbd_smb2_session_setup_state);
 449         if (req == NULL) {
 450                 return NULL;
 451         }
 452         state->ev = ev;
 453         state->smb2req = smb2req;
 454         state->in_session_id = in_session_id;
 455         state->in_flags = in_flags;
 456         state->in_security_mode = in_security_mode;
 457         state->in_previous_session_id = in_previous_session_id;
 458         state->in_security_buffer = in_security_buffer;
 459
 460         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 461
 462         if (state->in_session_id == 0) {
 463                 /* create a new session */
 464                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 465                                                 now, &state->session);
 466                 if (tevent_req_nterror(req, status)) {
 467                         return tevent_req_post(req, ev);
 468                 }
 469         } else {
 470                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 471                                                 state->in_session_id, now,
 472                                                 &state->session);
 473                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 474                         status = NT_STATUS_OK;
 475                 }
 476                 if (NT_STATUS_IS_OK(status)) {
 477                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 478                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 479                         TALLOC_FREE(state->session->gensec);
 480                 }
 481                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 482                         tevent_req_nterror(req, status);
 483                         return tevent_req_post(req, ev);
 484                 }
 485         }
 486
 487         if (state->session->gensec == NULL) {
 488                 status = auth_generic_prepare(state->session,
 489                                               state->session->connection->remote_address,
 490                                               &state->session->gensec);
 491                 if (tevent_req_nterror(req, status)) {
 492                         return tevent_req_post(req, ev);
 493                 }
 494
 495                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 496                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 497
 498                 status = gensec_start_mech_by_oid(state->session->gensec,
 499                                                   GENSEC_OID_SPNEGO);
 500                 if (tevent_req_nterror(req, status)) {
 501                         return tevent_req_post(req, ev);
 502                 }
 503         }
 504
 505         become_root();
 506         subreq = gensec_update_send(state, state->ev,
 507                                     state->session->gensec,
 508                                     state->in_security_buffer);
 509         unbecome_root();
 510         if (tevent_req_nomem(subreq, req)) {
 511                 return tevent_req_post(req, ev);
 512         }
 513         tevent_req_set_callback(subreq, smbd_smb2_session_setup_done, req);
 514
 515         return req;
 516 }
 517
 518 static void smbd_smb2_session_setup_done(struct tevent_req *subreq)
 519 {
 520         struct tevent_req *req =
 521                 tevent_req_callback_data(subreq,
 522                 struct tevent_req);
 523         struct smbd_smb2_session_setup_state *state =
 524                 tevent_req_data(req,
 525                 struct smbd_smb2_session_setup_state);
 526         NTSTATUS status;
 527
 528         become_root();
 529         status = gensec_update_recv(subreq, state,
 530                                     &state->out_security_buffer);
 531         unbecome_root();
 532         TALLOC_FREE(subreq);
 533         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 534             !NT_STATUS_IS_OK(status)) {
 535                 tevent_req_nterror(req, status);
 536                 return;
 537         }
 538
 539         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 540                 state->out_session_id = state->session->global->session_wire_id;
 541                 /* we want to keep the session */
 542                 state->session = NULL;
 543                 tevent_req_nterror(req, status);
 544                 return;
 545         }
 546
 547         if (state->session->global->auth_session_info != NULL) {
 548                 status = smbd_smb2_reauth_generic_return(state->session,
 549                                                          state->smb2req,
 550                                                          &state->out_session_flags,
 551                                                          &state->out_session_id);
 552                 if (tevent_req_nterror(req, status)) {
 553                         return;
 554                 }
 555                 /* we want to keep the session */
 556                 state->session = NULL;
 557                 tevent_req_done(req);
 558                 return;
 559         }
 560
 561         status = smbd_smb2_auth_generic_return(state->session,
 562                                                state->smb2req,
 563                                                state->in_security_mode,
 564                                                state->in_previous_session_id,
 565                                                state->in_security_buffer,
 566                                                &state->out_session_flags,
 567                                                &state->out_session_id);
 568         if (tevent_req_nterror(req, status)) {
 569                 return;
 570         }
 571
 572         /* we want to keep the session */
 573         state->session = NULL;
 574         tevent_req_done(req);
 575         return;
 576 }
 577
 578 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 579                                         uint16_t *out_session_flags,
 580                                         TALLOC_CTX *mem_ctx,
 581                                         DATA_BLOB *out_security_buffer,
 582                                         uint64_t *out_session_id)
 583 {
 584         struct smbd_smb2_session_setup_state *state =
 585                 tevent_req_data(req,
 586                 struct smbd_smb2_session_setup_state);
 587         NTSTATUS status;
 588
 589         if (tevent_req_is_nterror(req, &status)) {
 590                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 591                         tevent_req_received(req);
 592                         return nt_status_squash(status);
 593                 }
 594         } else {
 595                 status = NT_STATUS_OK;
 596         }
 597
 598         *out_session_flags = state->out_session_flags;
 599         *out_security_buffer = state->out_security_buffer;
 600         *out_session_id = state->out_session_id;
 601
 602         talloc_steal(mem_ctx, out_security_buffer->data);
 603         tevent_req_received(req);
 604         return status;
 605 }
 606
 607 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 608 {
 609         NTSTATUS status;
 610         DATA_BLOB outbody;
 611
 612         status = smbd_smb2_request_verify_sizes(req, 0x04);
 613         if (!NT_STATUS_IS_OK(status)) {
 614                 return smbd_smb2_request_error(req, status);
 615         }
 616
 617         /*
 618          * TODO: cancel all outstanding requests on the session
 619          */
 620         status = smbXsrv_session_logoff(req->session);
 621         if (!NT_STATUS_IS_OK(status)) {
 622                 DEBUG(0, ("smbd_smb2_request_process_logoff: "
 623                           "smbXsrv_session_logoff() failed: %s\n",
 624                           nt_errstr(status)));
 625                 /*
 626                  * If we hit this case, there is something completely
 627                  * wrong, so we better disconnect the transport connection.
 628                  */
 629                 return status;
 630         }
 631
 632         /*
 633          * we may need to sign the response, so we need to keep
 634          * the session until the response is sent to the wire.
 635          */
 636         talloc_steal(req, req->session);
 637
 638         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 639         if (outbody.data == NULL) {
 640                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 641         }
 642
 643         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 644         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 645
 646         return smbd_smb2_request_done(req, outbody, NULL);
 647 }