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                                         struct auth_session_info *session_info,
 181                                         uint16_t *out_session_flags,
 182                                         uint64_t *out_session_id)
 183 {
 184         NTSTATUS status;
 185         bool guest = false;
 186         uint8_t session_key[16];
 187         struct smbXsrv_session *x = session;
 188         struct smbXsrv_connection *conn = session->connection;
 189
 190         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 191             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 192                 x->global->signing_required = true;
 193         }
 194
 195         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 196                 /* we map anonymous to guest internally */
 197                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 198                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 199                 /* force no signing */
 200                 x->global->signing_required = false;
 201                 guest = true;
 202         }
 203
 204         ZERO_STRUCT(session_key);
 205         memcpy(session_key, session_info->session_key.data,
 206                MIN(session_info->session_key.length, sizeof(session_key)));
 207
 208         x->global->signing_key = data_blob_talloc(x->global,
 209                                                   session_key,
 210                                                   sizeof(session_key));
 211         if (x->global->signing_key.data == NULL) {
 212                 ZERO_STRUCT(session_key);
 213                 TALLOC_FREE(session);
 214                 return NT_STATUS_NO_MEMORY;
 215         }
 216
 217         if (conn->protocol >= PROTOCOL_SMB2_24) {
 218                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 219                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 220
 221                 smb2_key_derivation(session_key, sizeof(session_key),
 222                                     label.data, label.length,
 223                                     context.data, context.length,
 224                                     x->global->signing_key.data);
 225         }
 226
 227         x->global->application_key = data_blob_dup_talloc(x->global,
 228                                                 x->global->signing_key);
 229         if (x->global->application_key.data == NULL) {
 230                 ZERO_STRUCT(session_key);
 231                 TALLOC_FREE(session);
 232                 return NT_STATUS_NO_MEMORY;
 233         }
 234
 235         if (conn->protocol >= PROTOCOL_SMB2_24) {
 236                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 237                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 238
 239                 smb2_key_derivation(session_key, sizeof(session_key),
 240                                     label.data, label.length,
 241                                     context.data, context.length,
 242                                     x->global->application_key.data);
 243         }
 244         ZERO_STRUCT(session_key);
 245
 246         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 247                                                 x->global->signing_key);
 248         if (x->global->channels[0].signing_key.data == NULL) {
 249                 TALLOC_FREE(session);
 250                 return NT_STATUS_NO_MEMORY;
 251         }
 252
 253         data_blob_clear_free(&session_info->session_key);
 254         session_info->session_key = data_blob_dup_talloc(session_info,
 255                                                 x->global->application_key);
 256         if (session_info->session_key.data == NULL) {
 257                 TALLOC_FREE(session);
 258                 return NT_STATUS_NO_MEMORY;
 259         }
 260
 261         session->compat = talloc_zero(session, struct user_struct);
 262         if (session->compat == NULL) {
 263                 TALLOC_FREE(session);
 264                 return NT_STATUS_NO_MEMORY;
 265         }
 266         session->compat->session = session;
 267         session->compat->homes_snum = -1;
 268         session->compat->session_info = session_info;
 269         session->compat->session_keystr = NULL;
 270         session->compat->vuid = session->global->session_wire_id;
 271         DLIST_ADD(smb2req->sconn->users, session->compat);
 272         smb2req->sconn->num_users++;
 273
 274         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 275                 session->compat->homes_snum =
 276                         register_homes_share(session_info->unix_info->unix_name);
 277         }
 278
 279         if (!session_claim(smb2req->sconn, session->compat)) {
 280                 DEBUG(1, ("smb2: Failed to claim session "
 281                         "for vuid=%llu\n",
 282                         (unsigned long long)session->compat->vuid));
 283                 TALLOC_FREE(session);
 284                 return NT_STATUS_LOGON_FAILURE;
 285         }
 286
 287         set_current_user_info(session_info->unix_info->sanitized_username,
 288                               session_info->unix_info->unix_name,
 289                               session_info->info->domain_name);
 290
 291         reload_services(smb2req->sconn, conn_snum_used, true);
 292
 293         session->status = NT_STATUS_OK;
 294         session->global->auth_session_info = session_info;
 295         session->global->auth_session_info_seqnum += 1;
 296         session->global->channels[0].auth_session_info_seqnum =
 297                 session->global->auth_session_info_seqnum;
 298         session->global->expiration_time = gensec_expire_time(session->gensec);
 299
 300         status = smbXsrv_session_update(session);
 301         if (!NT_STATUS_IS_OK(status)) {
 302                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 303                           (unsigned long long)session->compat->vuid,
 304                           nt_errstr(status)));
 305                 TALLOC_FREE(session);
 306                 return NT_STATUS_LOGON_FAILURE;
 307         }
 308
 309         /*
 310          * we attach the session to the request
 311          * so that the response can be signed
 312          */
 313         smb2req->session = session;
 314         if (!guest) {
 315                 smb2req->do_signing = true;
 316         }
 317
 318         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 319
 320         *out_session_id = session->global->session_wire_id;
 321
 322         return NT_STATUS_OK;
 323 }
 324
 325 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 326                                         struct smbd_smb2_request *smb2req,
 327                                         struct auth_session_info *session_info,
 328                                         uint16_t *out_session_flags,
 329                                         uint64_t *out_session_id)
 330 {
 331         NTSTATUS status;
 332         struct smbXsrv_session *x = session;
 333         struct smbXsrv_connection *conn = session->connection;
 334
 335         data_blob_clear_free(&session_info->session_key);
 336         session_info->session_key = data_blob_dup_talloc(session_info,
 337                                                 x->global->application_key);
 338         if (session_info->session_key.data == NULL) {
 339                 TALLOC_FREE(session);
 340                 return NT_STATUS_NO_MEMORY;
 341         }
 342
 343         session->compat->session_info = session_info;
 344         session->compat->vuid = session->global->session_wire_id;
 345
 346         session->compat->homes_snum =
 347                         register_homes_share(session_info->unix_info->unix_name);
 348
 349         set_current_user_info(session_info->unix_info->sanitized_username,
 350                               session_info->unix_info->unix_name,
 351                               session_info->info->domain_name);
 352
 353         reload_services(smb2req->sconn, conn_snum_used, true);
 354
 355         session->status = NT_STATUS_OK;
 356         TALLOC_FREE(session->global->auth_session_info);
 357         session->global->auth_session_info = session_info;
 358         session->global->auth_session_info_seqnum += 1;
 359         session->global->channels[0].auth_session_info_seqnum =
 360                 session->global->auth_session_info_seqnum;
 361         session->global->expiration_time = gensec_expire_time(session->gensec);
 362
 363         status = smbXsrv_session_update(session);
 364         if (!NT_STATUS_IS_OK(status)) {
 365                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 366                           (unsigned long long)session->compat->vuid,
 367                           nt_errstr(status)));
 368                 TALLOC_FREE(session);
 369                 return NT_STATUS_LOGON_FAILURE;
 370         }
 371
 372         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 373
 374         /*
 375          * we attach the session to the request
 376          * so that the response can be signed
 377          */
 378         smb2req->session = session;
 379         smb2req->do_signing = true;
 380
 381         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 382
 383         *out_session_id = session->global->session_wire_id;
 384
 385         return NT_STATUS_OK;
 386 }
 387
 388 struct smbd_smb2_session_setup_state {
 389         struct tevent_context *ev;
 390         struct smbd_smb2_request *smb2req;
 391         uint64_t in_session_id;
 392         uint8_t in_flags;
 393         uint8_t in_security_mode;
 394         uint64_t in_previous_session_id;
 395         DATA_BLOB in_security_buffer;
 396         struct smbXsrv_session *session;
 397         struct auth_session_info *session_info;
 398         uint16_t out_session_flags;
 399         DATA_BLOB out_security_buffer;
 400         uint64_t out_session_id;
 401 };
 402
 403 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 404 {
 405         /*
 406          * if state->session is not NULL,
 407          * we remove the session on failure
 408          */
 409         TALLOC_FREE(state->session);
 410         return 0;
 411 }
 412
 413 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 414 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 415
 416 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 417                                         struct tevent_context *ev,
 418                                         struct smbd_smb2_request *smb2req,
 419                                         uint64_t in_session_id,
 420                                         uint8_t in_flags,
 421                                         uint8_t in_security_mode,
 422                                         uint64_t in_previous_session_id,
 423                                         DATA_BLOB in_security_buffer)
 424 {
 425         struct tevent_req *req;
 426         struct smbd_smb2_session_setup_state *state;
 427         NTSTATUS status;
 428         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 429         struct tevent_req *subreq;
 430
 431         req = tevent_req_create(mem_ctx, &state,
 432                                 struct smbd_smb2_session_setup_state);
 433         if (req == NULL) {
 434                 return NULL;
 435         }
 436         state->ev = ev;
 437         state->smb2req = smb2req;
 438         state->in_session_id = in_session_id;
 439         state->in_flags = in_flags;
 440         state->in_security_mode = in_security_mode;
 441         state->in_previous_session_id = in_previous_session_id;
 442         state->in_security_buffer = in_security_buffer;
 443
 444         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 445
 446         if (state->in_session_id == 0) {
 447                 /* create a new session */
 448                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 449                                                 now, &state->session);
 450                 if (tevent_req_nterror(req, status)) {
 451                         return tevent_req_post(req, ev);
 452                 }
 453         } else {
 454                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 455                                                 state->in_session_id, now,
 456                                                 &state->session);
 457                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 458                         status = NT_STATUS_OK;
 459                 }
 460                 if (NT_STATUS_IS_OK(status)) {
 461                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 462                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 463                         TALLOC_FREE(state->session->gensec);
 464                 }
 465                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 466                         tevent_req_nterror(req, status);
 467                         return tevent_req_post(req, ev);
 468                 }
 469         }
 470
 471         if (state->session->gensec == NULL) {
 472                 status = auth_generic_prepare(state->session,
 473                                               state->session->connection->remote_address,
 474                                               &state->session->gensec);
 475                 if (tevent_req_nterror(req, status)) {
 476                         return tevent_req_post(req, ev);
 477                 }
 478
 479                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 480                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 481
 482                 status = gensec_start_mech_by_oid(state->session->gensec,
 483                                                   GENSEC_OID_SPNEGO);
 484                 if (tevent_req_nterror(req, status)) {
 485                         return tevent_req_post(req, ev);
 486                 }
 487         }
 488
 489         become_root();
 490         subreq = gensec_update_send(state, state->ev,
 491                                     state->session->gensec,
 492                                     state->in_security_buffer);
 493         unbecome_root();
 494         if (tevent_req_nomem(subreq, req)) {
 495                 return tevent_req_post(req, ev);
 496         }
 497         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 498
 499         return req;
 500 }
 501
 502 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 503 {
 504         struct tevent_req *req =
 505                 tevent_req_callback_data(subreq,
 506                 struct tevent_req);
 507         struct smbd_smb2_session_setup_state *state =
 508                 tevent_req_data(req,
 509                 struct smbd_smb2_session_setup_state);
 510         NTSTATUS status;
 511
 512         become_root();
 513         status = gensec_update_recv(subreq, state,
 514                                     &state->out_security_buffer);
 515         unbecome_root();
 516         TALLOC_FREE(subreq);
 517         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 518             !NT_STATUS_IS_OK(status)) {
 519                 tevent_req_nterror(req, status);
 520                 return;
 521         }
 522
 523         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 524                 state->out_session_id = state->session->global->session_wire_id;
 525                 /* we want to keep the session */
 526                 state->session = NULL;
 527                 tevent_req_nterror(req, status);
 528                 return;
 529         }
 530
 531         status = gensec_session_info(state->session->gensec,
 532                                      state->session->global,
 533                                      &state->session_info);
 534         if (tevent_req_nterror(req, status)) {
 535                 return;
 536         }
 537
 538         if ((state->in_previous_session_id != 0) &&
 539              (state->session->global->session_wire_id !=
 540               state->in_previous_session_id))
 541         {
 542                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 543                                                 state->session->connection,
 544                                                 state->session_info,
 545                                                 state->in_previous_session_id,
 546                                                 state->session->global->session_wire_id);
 547                 if (tevent_req_nomem(subreq, req)) {
 548                         return;
 549                 }
 550                 tevent_req_set_callback(subreq,
 551                                         smbd_smb2_session_setup_previous_done,
 552                                         req);
 553                 return;
 554         }
 555
 556         if (state->session->global->auth_session_info != NULL) {
 557                 status = smbd_smb2_reauth_generic_return(state->session,
 558                                                          state->smb2req,
 559                                                          state->session_info,
 560                                                          &state->out_session_flags,
 561                                                          &state->out_session_id);
 562                 if (tevent_req_nterror(req, status)) {
 563                         return;
 564                 }
 565                 /* we want to keep the session */
 566                 state->session = NULL;
 567                 tevent_req_done(req);
 568                 return;
 569         }
 570
 571         status = smbd_smb2_auth_generic_return(state->session,
 572                                                state->smb2req,
 573                                                state->in_security_mode,
 574                                                state->session_info,
 575                                                &state->out_session_flags,
 576                                                &state->out_session_id);
 577         if (tevent_req_nterror(req, status)) {
 578                 return;
 579         }
 580
 581         /* we want to keep the session */
 582         state->session = NULL;
 583         tevent_req_done(req);
 584         return;
 585 }
 586
 587 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 588 {
 589         struct tevent_req *req =
 590                 tevent_req_callback_data(subreq,
 591                 struct tevent_req);
 592         struct smbd_smb2_session_setup_state *state =
 593                 tevent_req_data(req,
 594                 struct smbd_smb2_session_setup_state);
 595         NTSTATUS status;
 596
 597         status = smb2srv_session_close_previous_recv(subreq);
 598         TALLOC_FREE(subreq);
 599         if (tevent_req_nterror(req, status)) {
 600                 return;
 601         }
 602
 603         if (state->session->global->auth_session_info != NULL) {
 604                 status = smbd_smb2_reauth_generic_return(state->session,
 605                                                          state->smb2req,
 606                                                          state->session_info,
 607                                                          &state->out_session_flags,
 608                                                          &state->out_session_id);
 609                 if (tevent_req_nterror(req, status)) {
 610                         return;
 611                 }
 612                 /* we want to keep the session */
 613                 state->session = NULL;
 614                 tevent_req_done(req);
 615                 return;
 616         }
 617
 618         status = smbd_smb2_auth_generic_return(state->session,
 619                                                state->smb2req,
 620                                                state->in_security_mode,
 621                                                state->session_info,
 622                                                &state->out_session_flags,
 623                                                &state->out_session_id);
 624         if (tevent_req_nterror(req, status)) {
 625                 return;
 626         }
 627
 628         /* we want to keep the session */
 629         state->session = NULL;
 630         tevent_req_done(req);
 631         return;
 632 }
 633
 634 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 635                                         uint16_t *out_session_flags,
 636                                         TALLOC_CTX *mem_ctx,
 637                                         DATA_BLOB *out_security_buffer,
 638                                         uint64_t *out_session_id)
 639 {
 640         struct smbd_smb2_session_setup_state *state =
 641                 tevent_req_data(req,
 642                 struct smbd_smb2_session_setup_state);
 643         NTSTATUS status;
 644
 645         if (tevent_req_is_nterror(req, &status)) {
 646                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 647                         tevent_req_received(req);
 648                         return nt_status_squash(status);
 649                 }
 650         } else {
 651                 status = NT_STATUS_OK;
 652         }
 653
 654         *out_session_flags = state->out_session_flags;
 655         *out_security_buffer = state->out_security_buffer;
 656         *out_session_id = state->out_session_id;
 657
 658         talloc_steal(mem_ctx, out_security_buffer->data);
 659         tevent_req_received(req);
 660         return status;
 661 }
 662
 663 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 664 {
 665         NTSTATUS status;
 666         DATA_BLOB outbody;
 667
 668         status = smbd_smb2_request_verify_sizes(req, 0x04);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 return smbd_smb2_request_error(req, status);
 671         }
 672
 673         /*
 674          * TODO: cancel all outstanding requests on the session
 675          */
 676         status = smbXsrv_session_logoff(req->session);
 677         if (!NT_STATUS_IS_OK(status)) {
 678                 DEBUG(0, ("smbd_smb2_request_process_logoff: "
 679                           "smbXsrv_session_logoff() failed: %s\n",
 680                           nt_errstr(status)));
 681                 /*
 682                  * If we hit this case, there is something completely
 683                  * wrong, so we better disconnect the transport connection.
 684                  */
 685                 return status;
 686         }
 687
 688         /*
 689          * we may need to sign the response, so we need to keep
 690          * the session until the response is sent to the wire.
 691          */
 692         talloc_steal(req, req->session);
 693
 694         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 695         if (outbody.data == NULL) {
 696                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 697         }
 698
 699         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 700         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 701
 702         return smbd_smb2_request_done(req, outbody, NULL);
 703 }