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         uint64_t in_session_id;
  53         uint8_t in_flags;
  54         uint8_t in_security_mode;
  55         uint64_t in_previous_session_id;
  56         uint16_t in_security_offset;
  57         uint16_t in_security_length;
  58         DATA_BLOB in_security_buffer;
  59         NTSTATUS status;
  60         struct tevent_req *subreq;
  61
  62         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  63         if (!NT_STATUS_IS_OK(status)) {
  64                 return smbd_smb2_request_error(smb2req, status);
  65         }
  66         inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
  67         inbody = SMBD_SMB2_IN_BODY_PTR(smb2req);
  68
  69         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  70
  71         in_flags = CVAL(inbody, 0x02);
  72         in_security_mode = CVAL(inbody, 0x03);
  73         /* Capabilities = IVAL(inbody, 0x04) */
  74         /* Channel = IVAL(inbody, 0x08) */
  75         in_security_offset = SVAL(inbody, 0x0C);
  76         in_security_length = SVAL(inbody, 0x0E);
  77         in_previous_session_id = BVAL(inbody, 0x10);
  78
  79         if (in_security_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(smb2req))) {
  80                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (in_security_length > SMBD_SMB2_IN_DYN_LEN(smb2req)) {
  84                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_security_buffer.data = SMBD_SMB2_IN_DYN_PTR(smb2req);
  88         in_security_buffer.length = in_security_length;
  89
  90         subreq = smbd_smb2_session_setup_send(smb2req,
  91                                               smb2req->sconn->ev_ctx,
  92                                               smb2req,
  93                                               in_session_id,
  94                                               in_flags,
  95                                               in_security_mode,
  96                                               in_previous_session_id,
  97                                               in_security_buffer);
  98         if (subreq == NULL) {
  99                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 100         }
 101         tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
 102
 103         return smbd_smb2_request_pending_queue(smb2req, subreq, 500);
 104 }
 105
 106 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
 107 {
 108         struct smbd_smb2_request *smb2req =
 109                 tevent_req_callback_data(subreq,
 110                 struct smbd_smb2_request);
 111         uint8_t *outhdr;
 112         DATA_BLOB outbody;
 113         DATA_BLOB outdyn;
 114         uint16_t out_session_flags;
 115         uint64_t out_session_id;
 116         uint16_t out_security_offset;
 117         DATA_BLOB out_security_buffer = data_blob_null;
 118         NTSTATUS status;
 119         NTSTATUS error; /* transport error */
 120
 121         status = smbd_smb2_session_setup_recv(subreq,
 122                                               &out_session_flags,
 123                                               smb2req,
 124                                               &out_security_buffer,
 125                                               &out_session_id);
 126         TALLOC_FREE(subreq);
 127         if (!NT_STATUS_IS_OK(status) &&
 128             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 129                 status = nt_status_squash(status);
 130                 error = smbd_smb2_request_error(smb2req, status);
 131                 if (!NT_STATUS_IS_OK(error)) {
 132                         smbd_server_connection_terminate(smb2req->sconn,
 133                                                          nt_errstr(error));
 134                         return;
 135                 }
 136                 return;
 137         }
 138
 139         out_security_offset = SMB2_HDR_BODY + 0x08;
 140
 141         outhdr = SMBD_SMB2_OUT_HDR_PTR(smb2req);
 142
 143         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 144         if (outbody.data == NULL) {
 145                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 146                 if (!NT_STATUS_IS_OK(error)) {
 147                         smbd_server_connection_terminate(smb2req->sconn,
 148                                                          nt_errstr(error));
 149                         return;
 150                 }
 151                 return;
 152         }
 153
 154         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 155
 156         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 157         SSVAL(outbody.data, 0x02,
 158               out_session_flags);               /* session flags */
 159         SSVAL(outbody.data, 0x04,
 160               out_security_offset);             /* security buffer offset */
 161         SSVAL(outbody.data, 0x06,
 162               out_security_buffer.length);      /* security buffer length */
 163
 164         outdyn = out_security_buffer;
 165
 166         error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 167                                            __location__);
 168         if (!NT_STATUS_IS_OK(error)) {
 169                 smbd_server_connection_terminate(smb2req->sconn,
 170                                                  nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 static NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
 176                                         struct smbd_smb2_request *smb2req,
 177                                         uint8_t in_security_mode,
 178                                         struct auth_session_info *session_info,
 179                                         uint16_t *out_session_flags,
 180                                         uint64_t *out_session_id)
 181 {
 182         NTSTATUS status;
 183         bool guest = false;
 184         uint8_t session_key[16];
 185         struct smbXsrv_session *x = session;
 186         struct smbXsrv_connection *conn = session->connection;
 187
 188         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 189             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 190                 x->global->signing_required = true;
 191         }
 192
 193         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 194                 x->global->encryption_required = true;
 195         }
 196
 197         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 198                 /* we map anonymous to guest internally */
 199                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 200                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 201                 /* force no signing */
 202                 x->global->signing_required = false;
 203                 guest = true;
 204         }
 205
 206         if (guest && x->global->encryption_required) {
 207                 DEBUG(1,("reject guest session as encryption is required\n"));
 208                 return NT_STATUS_ACCESS_DENIED;
 209         }
 210
 211         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 212                 if (x->global->encryption_required) {
 213                         DEBUG(1,("reject session with dialect[0x%04X] "
 214                                  "as encryption is required\n",
 215                                  conn->smb2.server.dialect));
 216                         return NT_STATUS_ACCESS_DENIED;
 217                 }
 218         }
 219
 220         if (x->global->encryption_required) {
 221                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 222         }
 223
 224         ZERO_STRUCT(session_key);
 225         memcpy(session_key, session_info->session_key.data,
 226                MIN(session_info->session_key.length, sizeof(session_key)));
 227
 228         x->global->signing_key = data_blob_talloc(x->global,
 229                                                   session_key,
 230                                                   sizeof(session_key));
 231         if (x->global->signing_key.data == NULL) {
 232                 ZERO_STRUCT(session_key);
 233                 return NT_STATUS_NO_MEMORY;
 234         }
 235
 236         if (conn->protocol >= PROTOCOL_SMB2_24) {
 237                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 238                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 239
 240                 smb2_key_derivation(session_key, sizeof(session_key),
 241                                     label.data, label.length,
 242                                     context.data, context.length,
 243                                     x->global->signing_key.data);
 244         }
 245
 246         if (conn->protocol >= PROTOCOL_SMB2_24) {
 247                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 248                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
 249
 250                 x->global->decryption_key = data_blob_talloc(x->global,
 251                                                              session_key,
 252                                                              sizeof(session_key));
 253                 if (x->global->decryption_key.data == NULL) {
 254                         ZERO_STRUCT(session_key);
 255                         return NT_STATUS_NO_MEMORY;
 256                 }
 257
 258                 smb2_key_derivation(session_key, sizeof(session_key),
 259                                     label.data, label.length,
 260                                     context.data, context.length,
 261                                     x->global->decryption_key.data);
 262         }
 263
 264         if (conn->protocol >= PROTOCOL_SMB2_24) {
 265                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 266                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
 267
 268                 x->global->encryption_key = data_blob_talloc(x->global,
 269                                                              session_key,
 270                                                              sizeof(session_key));
 271                 if (x->global->encryption_key.data == NULL) {
 272                         ZERO_STRUCT(session_key);
 273                         return NT_STATUS_NO_MEMORY;
 274                 }
 275
 276                 smb2_key_derivation(session_key, sizeof(session_key),
 277                                     label.data, label.length,
 278                                     context.data, context.length,
 279                                     x->global->encryption_key.data);
 280
 281                 generate_random_buffer((uint8_t *)&x->nonce_high, sizeof(x->nonce_high));
 282                 x->nonce_low = 1;
 283         }
 284
 285         x->global->application_key = data_blob_dup_talloc(x->global,
 286                                                 x->global->signing_key);
 287         if (x->global->application_key.data == NULL) {
 288                 ZERO_STRUCT(session_key);
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291
 292         if (conn->protocol >= PROTOCOL_SMB2_24) {
 293                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 294                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 295
 296                 smb2_key_derivation(session_key, sizeof(session_key),
 297                                     label.data, label.length,
 298                                     context.data, context.length,
 299                                     x->global->application_key.data);
 300         }
 301         ZERO_STRUCT(session_key);
 302
 303         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 304                                                 x->global->signing_key);
 305         if (x->global->channels[0].signing_key.data == NULL) {
 306                 return NT_STATUS_NO_MEMORY;
 307         }
 308
 309         data_blob_clear_free(&session_info->session_key);
 310         session_info->session_key = data_blob_dup_talloc(session_info,
 311                                                 x->global->application_key);
 312         if (session_info->session_key.data == NULL) {
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         session->compat = talloc_zero(session, struct user_struct);
 317         if (session->compat == NULL) {
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320         session->compat->session = session;
 321         session->compat->homes_snum = -1;
 322         session->compat->session_info = session_info;
 323         session->compat->session_keystr = NULL;
 324         session->compat->vuid = session->global->session_wire_id;
 325         DLIST_ADD(smb2req->sconn->users, session->compat);
 326         smb2req->sconn->num_users++;
 327
 328         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 329                 session->compat->homes_snum =
 330                         register_homes_share(session_info->unix_info->unix_name);
 331         }
 332
 333         if (!session_claim(smb2req->sconn, session->compat)) {
 334                 DEBUG(1, ("smb2: Failed to claim session "
 335                         "for vuid=%llu\n",
 336                         (unsigned long long)session->compat->vuid));
 337                 return NT_STATUS_LOGON_FAILURE;
 338         }
 339
 340         set_current_user_info(session_info->unix_info->sanitized_username,
 341                               session_info->unix_info->unix_name,
 342                               session_info->info->domain_name);
 343
 344         reload_services(smb2req->sconn, conn_snum_used, true);
 345
 346         session->status = NT_STATUS_OK;
 347         session->global->auth_session_info = session_info;
 348         session->global->auth_session_info_seqnum += 1;
 349         session->global->channels[0].auth_session_info_seqnum =
 350                 session->global->auth_session_info_seqnum;
 351         session->global->expiration_time = gensec_expire_time(session->gensec);
 352
 353         status = smbXsrv_session_update(session);
 354         if (!NT_STATUS_IS_OK(status)) {
 355                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 356                           (unsigned long long)session->compat->vuid,
 357                           nt_errstr(status)));
 358                 return NT_STATUS_LOGON_FAILURE;
 359         }
 360
 361         /*
 362          * we attach the session to the request
 363          * so that the response can be signed
 364          */
 365         smb2req->session = session;
 366         if (!guest) {
 367                 smb2req->do_signing = true;
 368         }
 369
 370         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 371
 372         *out_session_id = session->global->session_wire_id;
 373
 374         return NT_STATUS_OK;
 375 }
 376
 377 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 378                                         struct smbd_smb2_request *smb2req,
 379                                         struct auth_session_info *session_info,
 380                                         uint16_t *out_session_flags,
 381                                         uint64_t *out_session_id)
 382 {
 383         NTSTATUS status;
 384         struct smbXsrv_session *x = session;
 385         struct smbXsrv_connection *conn = session->connection;
 386
 387         data_blob_clear_free(&session_info->session_key);
 388         session_info->session_key = data_blob_dup_talloc(session_info,
 389                                                 x->global->application_key);
 390         if (session_info->session_key.data == NULL) {
 391                 return NT_STATUS_NO_MEMORY;
 392         }
 393
 394         session->compat->session_info = session_info;
 395         session->compat->vuid = session->global->session_wire_id;
 396
 397         session->compat->homes_snum =
 398                         register_homes_share(session_info->unix_info->unix_name);
 399
 400         set_current_user_info(session_info->unix_info->sanitized_username,
 401                               session_info->unix_info->unix_name,
 402                               session_info->info->domain_name);
 403
 404         reload_services(smb2req->sconn, conn_snum_used, true);
 405
 406         session->status = NT_STATUS_OK;
 407         TALLOC_FREE(session->global->auth_session_info);
 408         session->global->auth_session_info = session_info;
 409         session->global->auth_session_info_seqnum += 1;
 410         session->global->channels[0].auth_session_info_seqnum =
 411                 session->global->auth_session_info_seqnum;
 412         session->global->expiration_time = gensec_expire_time(session->gensec);
 413
 414         status = smbXsrv_session_update(session);
 415         if (!NT_STATUS_IS_OK(status)) {
 416                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 417                           (unsigned long long)session->compat->vuid,
 418                           nt_errstr(status)));
 419                 return NT_STATUS_LOGON_FAILURE;
 420         }
 421
 422         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 423
 424         *out_session_id = session->global->session_wire_id;
 425
 426         return NT_STATUS_OK;
 427 }
 428
 429 struct smbd_smb2_session_setup_state {
 430         struct tevent_context *ev;
 431         struct smbd_smb2_request *smb2req;
 432         uint64_t in_session_id;
 433         uint8_t in_flags;
 434         uint8_t in_security_mode;
 435         uint64_t in_previous_session_id;
 436         DATA_BLOB in_security_buffer;
 437         struct smbXsrv_session *session;
 438         struct auth_session_info *session_info;
 439         uint16_t out_session_flags;
 440         DATA_BLOB out_security_buffer;
 441         uint64_t out_session_id;
 442 };
 443
 444 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 445 {
 446         /*
 447          * if state->session is not NULL,
 448          * we remove the session on failure
 449          */
 450         TALLOC_FREE(state->session);
 451         return 0;
 452 }
 453
 454 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 455 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 456
 457 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 458                                         struct tevent_context *ev,
 459                                         struct smbd_smb2_request *smb2req,
 460                                         uint64_t in_session_id,
 461                                         uint8_t in_flags,
 462                                         uint8_t in_security_mode,
 463                                         uint64_t in_previous_session_id,
 464                                         DATA_BLOB in_security_buffer)
 465 {
 466         struct tevent_req *req;
 467         struct smbd_smb2_session_setup_state *state;
 468         NTSTATUS status;
 469         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 470         struct tevent_req *subreq;
 471
 472         req = tevent_req_create(mem_ctx, &state,
 473                                 struct smbd_smb2_session_setup_state);
 474         if (req == NULL) {
 475                 return NULL;
 476         }
 477         state->ev = ev;
 478         state->smb2req = smb2req;
 479         state->in_session_id = in_session_id;
 480         state->in_flags = in_flags;
 481         state->in_security_mode = in_security_mode;
 482         state->in_previous_session_id = in_previous_session_id;
 483         state->in_security_buffer = in_security_buffer;
 484
 485         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 486                 if (smb2req->sconn->conn->protocol < PROTOCOL_SMB2_22) {
 487                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 488                         return tevent_req_post(req, ev);
 489                 }
 490
 491                 /*
 492                  * We do not support multi channel.
 493                  */
 494                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 495                 return tevent_req_post(req, ev);
 496         }
 497
 498         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 499
 500         if (state->in_session_id == 0) {
 501                 /* create a new session */
 502                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 503                                                 now, &state->session);
 504                 if (tevent_req_nterror(req, status)) {
 505                         return tevent_req_post(req, ev);
 506                 }
 507         } else {
 508                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 509                                                 state->in_session_id, now,
 510                                                 &state->session);
 511                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 512                         status = NT_STATUS_OK;
 513                 }
 514                 if (NT_STATUS_IS_OK(status)) {
 515                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 516                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 517                         TALLOC_FREE(state->session->gensec);
 518                 }
 519                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 520                         tevent_req_nterror(req, status);
 521                         return tevent_req_post(req, ev);
 522                 }
 523         }
 524
 525         if (state->session->gensec == NULL) {
 526                 status = auth_generic_prepare(state->session,
 527                                               state->session->connection->remote_address,
 528                                               &state->session->gensec);
 529                 if (tevent_req_nterror(req, status)) {
 530                         return tevent_req_post(req, ev);
 531                 }
 532
 533                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 534                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 535
 536                 status = gensec_start_mech_by_oid(state->session->gensec,
 537                                                   GENSEC_OID_SPNEGO);
 538                 if (tevent_req_nterror(req, status)) {
 539                         return tevent_req_post(req, ev);
 540                 }
 541         }
 542
 543         become_root();
 544         subreq = gensec_update_send(state, state->ev,
 545                                     state->session->gensec,
 546                                     state->in_security_buffer);
 547         unbecome_root();
 548         if (tevent_req_nomem(subreq, req)) {
 549                 return tevent_req_post(req, ev);
 550         }
 551         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 552
 553         return req;
 554 }
 555
 556 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 557 {
 558         struct tevent_req *req =
 559                 tevent_req_callback_data(subreq,
 560                 struct tevent_req);
 561         struct smbd_smb2_session_setup_state *state =
 562                 tevent_req_data(req,
 563                 struct smbd_smb2_session_setup_state);
 564         NTSTATUS status;
 565
 566         become_root();
 567         status = gensec_update_recv(subreq, state,
 568                                     &state->out_security_buffer);
 569         unbecome_root();
 570         TALLOC_FREE(subreq);
 571         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 572             !NT_STATUS_IS_OK(status)) {
 573                 tevent_req_nterror(req, status);
 574                 return;
 575         }
 576
 577         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 578                 state->out_session_id = state->session->global->session_wire_id;
 579                 /* we want to keep the session */
 580                 state->session = NULL;
 581                 tevent_req_nterror(req, status);
 582                 return;
 583         }
 584
 585         status = gensec_session_info(state->session->gensec,
 586                                      state->session->global,
 587                                      &state->session_info);
 588         if (tevent_req_nterror(req, status)) {
 589                 return;
 590         }
 591
 592         if ((state->in_previous_session_id != 0) &&
 593              (state->session->global->session_wire_id !=
 594               state->in_previous_session_id))
 595         {
 596                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 597                                                 state->session->connection,
 598                                                 state->session_info,
 599                                                 state->in_previous_session_id,
 600                                                 state->session->global->session_wire_id);
 601                 if (tevent_req_nomem(subreq, req)) {
 602                         return;
 603                 }
 604                 tevent_req_set_callback(subreq,
 605                                         smbd_smb2_session_setup_previous_done,
 606                                         req);
 607                 return;
 608         }
 609
 610         if (state->session->global->auth_session_info != NULL) {
 611                 status = smbd_smb2_reauth_generic_return(state->session,
 612                                                          state->smb2req,
 613                                                          state->session_info,
 614                                                          &state->out_session_flags,
 615                                                          &state->out_session_id);
 616                 if (tevent_req_nterror(req, status)) {
 617                         return;
 618                 }
 619                 /* we want to keep the session */
 620                 state->session = NULL;
 621                 tevent_req_done(req);
 622                 return;
 623         }
 624
 625         status = smbd_smb2_auth_generic_return(state->session,
 626                                                state->smb2req,
 627                                                state->in_security_mode,
 628                                                state->session_info,
 629                                                &state->out_session_flags,
 630                                                &state->out_session_id);
 631         if (tevent_req_nterror(req, status)) {
 632                 return;
 633         }
 634
 635         /* we want to keep the session */
 636         state->session = NULL;
 637         tevent_req_done(req);
 638         return;
 639 }
 640
 641 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 642 {
 643         struct tevent_req *req =
 644                 tevent_req_callback_data(subreq,
 645                 struct tevent_req);
 646         struct smbd_smb2_session_setup_state *state =
 647                 tevent_req_data(req,
 648                 struct smbd_smb2_session_setup_state);
 649         NTSTATUS status;
 650
 651         status = smb2srv_session_close_previous_recv(subreq);
 652         TALLOC_FREE(subreq);
 653         if (tevent_req_nterror(req, status)) {
 654                 return;
 655         }
 656
 657         if (state->session->global->auth_session_info != NULL) {
 658                 status = smbd_smb2_reauth_generic_return(state->session,
 659                                                          state->smb2req,
 660                                                          state->session_info,
 661                                                          &state->out_session_flags,
 662                                                          &state->out_session_id);
 663                 if (tevent_req_nterror(req, status)) {
 664                         return;
 665                 }
 666                 /* we want to keep the session */
 667                 state->session = NULL;
 668                 tevent_req_done(req);
 669                 return;
 670         }
 671
 672         status = smbd_smb2_auth_generic_return(state->session,
 673                                                state->smb2req,
 674                                                state->in_security_mode,
 675                                                state->session_info,
 676                                                &state->out_session_flags,
 677                                                &state->out_session_id);
 678         if (tevent_req_nterror(req, status)) {
 679                 return;
 680         }
 681
 682         /* we want to keep the session */
 683         state->session = NULL;
 684         tevent_req_done(req);
 685         return;
 686 }
 687
 688 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 689                                         uint16_t *out_session_flags,
 690                                         TALLOC_CTX *mem_ctx,
 691                                         DATA_BLOB *out_security_buffer,
 692                                         uint64_t *out_session_id)
 693 {
 694         struct smbd_smb2_session_setup_state *state =
 695                 tevent_req_data(req,
 696                 struct smbd_smb2_session_setup_state);
 697         NTSTATUS status;
 698
 699         if (tevent_req_is_nterror(req, &status)) {
 700                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 701                         tevent_req_received(req);
 702                         return nt_status_squash(status);
 703                 }
 704         } else {
 705                 status = NT_STATUS_OK;
 706         }
 707
 708         *out_session_flags = state->out_session_flags;
 709         *out_security_buffer = state->out_security_buffer;
 710         *out_session_id = state->out_session_id;
 711
 712         talloc_steal(mem_ctx, out_security_buffer->data);
 713         tevent_req_received(req);
 714         return status;
 715 }
 716
 717 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 718 {
 719         NTSTATUS status;
 720         DATA_BLOB outbody;
 721
 722         status = smbd_smb2_request_verify_sizes(req, 0x04);
 723         if (!NT_STATUS_IS_OK(status)) {
 724                 return smbd_smb2_request_error(req, status);
 725         }
 726
 727         /*
 728          * TODO: cancel all outstanding requests on the session
 729          */
 730         status = smbXsrv_session_logoff(req->session);
 731         if (!NT_STATUS_IS_OK(status)) {
 732                 DEBUG(0, ("smbd_smb2_request_process_logoff: "
 733                           "smbXsrv_session_logoff() failed: %s\n",
 734                           nt_errstr(status)));
 735                 /*
 736                  * If we hit this case, there is something completely
 737                  * wrong, so we better disconnect the transport connection.
 738                  */
 739                 return status;
 740         }
 741
 742         /*
 743          * we may need to sign the response, so we need to keep
 744          * the session until the response is sent to the wire.
 745          */
 746         talloc_steal(req, req->session);
 747
 748         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 749         if (outbody.data == NULL) {
 750                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 751         }
 752
 753         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 754         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 755
 756         return smbd_smb2_request_done(req, outbody, NULL);
 757 }