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_wrap_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_wrap_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_wrap_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_wrap_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_OFF) &&
 194             (conn->smb2.client.capabilities & SMB2_CAP_ENCRYPTION)) {
 195                 x->global->encryption_required = true;
 196         }
 197
 198         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 199                 x->global->encryption_required = true;
 200         }
 201
 202         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 203                 /* we map anonymous to guest internally */
 204                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 205                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 206                 /* force no signing */
 207                 x->global->signing_required = false;
 208                 guest = true;
 209         }
 210
 211         if (guest && x->global->encryption_required) {
 212                 DEBUG(1,("reject guest session as encryption is required\n"));
 213                 return NT_STATUS_ACCESS_DENIED;
 214         }
 215
 216         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 217                 if (x->global->encryption_required) {
 218                         DEBUG(1,("reject session with dialect[0x%04X] "
 219                                  "as encryption is required\n",
 220                                  conn->smb2.server.dialect));
 221                         return NT_STATUS_ACCESS_DENIED;
 222                 }
 223         }
 224
 225         if (x->global->encryption_required) {
 226                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 227         }
 228
 229         ZERO_STRUCT(session_key);
 230         memcpy(session_key, session_info->session_key.data,
 231                MIN(session_info->session_key.length, sizeof(session_key)));
 232
 233         x->global->signing_key = data_blob_talloc(x->global,
 234                                                   session_key,
 235                                                   sizeof(session_key));
 236         if (x->global->signing_key.data == NULL) {
 237                 ZERO_STRUCT(session_key);
 238                 return NT_STATUS_NO_MEMORY;
 239         }
 240
 241         if (conn->protocol >= PROTOCOL_SMB2_24) {
 242                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 243                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 244
 245                 smb2_key_derivation(session_key, sizeof(session_key),
 246                                     label.data, label.length,
 247                                     context.data, context.length,
 248                                     x->global->signing_key.data);
 249         }
 250
 251         if (conn->protocol >= PROTOCOL_SMB2_24) {
 252                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 253                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
 254
 255                 x->global->decryption_key = data_blob_talloc(x->global,
 256                                                              session_key,
 257                                                              sizeof(session_key));
 258                 if (x->global->decryption_key.data == NULL) {
 259                         ZERO_STRUCT(session_key);
 260                         return NT_STATUS_NO_MEMORY;
 261                 }
 262
 263                 smb2_key_derivation(session_key, sizeof(session_key),
 264                                     label.data, label.length,
 265                                     context.data, context.length,
 266                                     x->global->decryption_key.data);
 267         }
 268
 269         if (conn->protocol >= PROTOCOL_SMB2_24) {
 270                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 271                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
 272
 273                 x->global->encryption_key = data_blob_talloc(x->global,
 274                                                              session_key,
 275                                                              sizeof(session_key));
 276                 if (x->global->encryption_key.data == NULL) {
 277                         ZERO_STRUCT(session_key);
 278                         return NT_STATUS_NO_MEMORY;
 279                 }
 280
 281                 smb2_key_derivation(session_key, sizeof(session_key),
 282                                     label.data, label.length,
 283                                     context.data, context.length,
 284                                     x->global->encryption_key.data);
 285
 286                 generate_random_buffer((uint8_t *)&x->nonce_high, sizeof(x->nonce_high));
 287                 x->nonce_low = 1;
 288         }
 289
 290         x->global->application_key = data_blob_dup_talloc(x->global,
 291                                                 x->global->signing_key);
 292         if (x->global->application_key.data == NULL) {
 293                 ZERO_STRUCT(session_key);
 294                 return NT_STATUS_NO_MEMORY;
 295         }
 296
 297         if (conn->protocol >= PROTOCOL_SMB2_24) {
 298                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 299                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 300
 301                 smb2_key_derivation(session_key, sizeof(session_key),
 302                                     label.data, label.length,
 303                                     context.data, context.length,
 304                                     x->global->application_key.data);
 305         }
 306         ZERO_STRUCT(session_key);
 307
 308         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 309                                                 x->global->signing_key);
 310         if (x->global->channels[0].signing_key.data == NULL) {
 311                 return NT_STATUS_NO_MEMORY;
 312         }
 313
 314         data_blob_clear_free(&session_info->session_key);
 315         session_info->session_key = data_blob_dup_talloc(session_info,
 316                                                 x->global->application_key);
 317         if (session_info->session_key.data == NULL) {
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320
 321         session->compat = talloc_zero(session, struct user_struct);
 322         if (session->compat == NULL) {
 323                 return NT_STATUS_NO_MEMORY;
 324         }
 325         session->compat->session = session;
 326         session->compat->homes_snum = -1;
 327         session->compat->session_info = session_info;
 328         session->compat->session_keystr = NULL;
 329         session->compat->vuid = session->global->session_wire_id;
 330         DLIST_ADD(smb2req->sconn->users, session->compat);
 331         smb2req->sconn->num_users++;
 332
 333         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 334                 session->compat->homes_snum =
 335                         register_homes_share(session_info->unix_info->unix_name);
 336         }
 337
 338         set_current_user_info(session_info->unix_info->sanitized_username,
 339                               session_info->unix_info->unix_name,
 340                               session_info->info->domain_name);
 341
 342         reload_services(smb2req->sconn, conn_snum_used, true);
 343
 344         session->status = NT_STATUS_OK;
 345         session->global->auth_session_info = session_info;
 346         session->global->auth_session_info_seqnum += 1;
 347         session->global->channels[0].auth_session_info_seqnum =
 348                 session->global->auth_session_info_seqnum;
 349         session->global->expiration_time = gensec_expire_time(session->gensec);
 350
 351         if (!session_claim(session)) {
 352                 DEBUG(1, ("smb2: Failed to claim session "
 353                         "for vuid=%llu\n",
 354                         (unsigned long long)session->compat->vuid));
 355                 return NT_STATUS_LOGON_FAILURE;
 356         }
 357
 358         status = smbXsrv_session_update(session);
 359         if (!NT_STATUS_IS_OK(status)) {
 360                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 361                           (unsigned long long)session->compat->vuid,
 362                           nt_errstr(status)));
 363                 return NT_STATUS_LOGON_FAILURE;
 364         }
 365
 366         /*
 367          * we attach the session to the request
 368          * so that the response can be signed
 369          */
 370         if (!guest) {
 371                 smb2req->do_signing = true;
 372         }
 373
 374         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 375
 376         *out_session_id = session->global->session_wire_id;
 377
 378         return NT_STATUS_OK;
 379 }
 380
 381 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 382                                         struct smbd_smb2_request *smb2req,
 383                                         struct auth_session_info *session_info,
 384                                         uint16_t *out_session_flags,
 385                                         uint64_t *out_session_id)
 386 {
 387         NTSTATUS status;
 388         struct smbXsrv_session *x = session;
 389         struct smbXsrv_connection *conn = session->connection;
 390
 391         data_blob_clear_free(&session_info->session_key);
 392         session_info->session_key = data_blob_dup_talloc(session_info,
 393                                                 x->global->application_key);
 394         if (session_info->session_key.data == NULL) {
 395                 return NT_STATUS_NO_MEMORY;
 396         }
 397
 398         session->compat->session_info = session_info;
 399         session->compat->vuid = session->global->session_wire_id;
 400
 401         session->compat->homes_snum =
 402                         register_homes_share(session_info->unix_info->unix_name);
 403
 404         set_current_user_info(session_info->unix_info->sanitized_username,
 405                               session_info->unix_info->unix_name,
 406                               session_info->info->domain_name);
 407
 408         reload_services(smb2req->sconn, conn_snum_used, true);
 409
 410         session->status = NT_STATUS_OK;
 411         TALLOC_FREE(session->global->auth_session_info);
 412         session->global->auth_session_info = session_info;
 413         session->global->auth_session_info_seqnum += 1;
 414         session->global->channels[0].auth_session_info_seqnum =
 415                 session->global->auth_session_info_seqnum;
 416         session->global->expiration_time = gensec_expire_time(session->gensec);
 417
 418         status = smbXsrv_session_update(session);
 419         if (!NT_STATUS_IS_OK(status)) {
 420                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 421                           (unsigned long long)session->compat->vuid,
 422                           nt_errstr(status)));
 423                 return NT_STATUS_LOGON_FAILURE;
 424         }
 425
 426         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 427
 428         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 429                 smb2req->do_signing = true;
 430         }
 431
 432         *out_session_id = session->global->session_wire_id;
 433
 434         return NT_STATUS_OK;
 435 }
 436
 437 struct smbd_smb2_session_setup_state {
 438         struct tevent_context *ev;
 439         struct smbd_smb2_request *smb2req;
 440         uint64_t in_session_id;
 441         uint8_t in_flags;
 442         uint8_t in_security_mode;
 443         uint64_t in_previous_session_id;
 444         DATA_BLOB in_security_buffer;
 445         struct smbXsrv_session *session;
 446         struct auth_session_info *session_info;
 447         uint16_t out_session_flags;
 448         DATA_BLOB out_security_buffer;
 449         uint64_t out_session_id;
 450 };
 451
 452 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 453 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 454
 455 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 456                                         struct tevent_context *ev,
 457                                         struct smbd_smb2_request *smb2req,
 458                                         uint64_t in_session_id,
 459                                         uint8_t in_flags,
 460                                         uint8_t in_security_mode,
 461                                         uint64_t in_previous_session_id,
 462                                         DATA_BLOB in_security_buffer)
 463 {
 464         struct tevent_req *req;
 465         struct smbd_smb2_session_setup_state *state;
 466         NTSTATUS status;
 467         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 468         struct tevent_req *subreq;
 469
 470         req = tevent_req_create(mem_ctx, &state,
 471                                 struct smbd_smb2_session_setup_state);
 472         if (req == NULL) {
 473                 return NULL;
 474         }
 475         state->ev = ev;
 476         state->smb2req = smb2req;
 477         state->in_session_id = in_session_id;
 478         state->in_flags = in_flags;
 479         state->in_security_mode = in_security_mode;
 480         state->in_previous_session_id = in_previous_session_id;
 481         state->in_security_buffer = in_security_buffer;
 482
 483         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 484                 if (smb2req->sconn->conn->protocol < PROTOCOL_SMB2_22) {
 485                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 486                         return tevent_req_post(req, ev);
 487                 }
 488
 489                 /*
 490                  * We do not support multi channel.
 491                  */
 492                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 493                 return tevent_req_post(req, ev);
 494         }
 495
 496         if (state->in_session_id == 0) {
 497                 /* create a new session */
 498                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 499                                                 now, &state->session);
 500                 if (tevent_req_nterror(req, status)) {
 501                         return tevent_req_post(req, ev);
 502                 }
 503                 smb2req->session = state->session;
 504         } else {
 505                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 506                                                 state->in_session_id, now,
 507                                                 &state->session);
 508                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 509                         status = NT_STATUS_OK;
 510                 }
 511                 if (NT_STATUS_IS_OK(status)) {
 512                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 513                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 514                         TALLOC_FREE(state->session->gensec);
 515                 }
 516                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 517                         tevent_req_nterror(req, status);
 518                         return tevent_req_post(req, ev);
 519                 }
 520         }
 521
 522         if (state->session->gensec == NULL) {
 523                 status = auth_generic_prepare(state->session,
 524                                               state->session->connection->remote_address,
 525                                               &state->session->gensec);
 526                 if (tevent_req_nterror(req, status)) {
 527                         return tevent_req_post(req, ev);
 528                 }
 529
 530                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 531                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 532
 533                 status = gensec_start_mech_by_oid(state->session->gensec,
 534                                                   GENSEC_OID_SPNEGO);
 535                 if (tevent_req_nterror(req, status)) {
 536                         return tevent_req_post(req, ev);
 537                 }
 538         }
 539
 540         become_root();
 541         subreq = gensec_update_send(state, state->ev,
 542                                     state->session->gensec,
 543                                     state->in_security_buffer);
 544         unbecome_root();
 545         if (tevent_req_nomem(subreq, req)) {
 546                 return tevent_req_post(req, ev);
 547         }
 548         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 549
 550         return req;
 551 }
 552
 553 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 554 {
 555         struct tevent_req *req =
 556                 tevent_req_callback_data(subreq,
 557                 struct tevent_req);
 558         struct smbd_smb2_session_setup_state *state =
 559                 tevent_req_data(req,
 560                 struct smbd_smb2_session_setup_state);
 561         NTSTATUS status;
 562
 563         become_root();
 564         status = gensec_update_recv(subreq, state,
 565                                     &state->out_security_buffer);
 566         unbecome_root();
 567         TALLOC_FREE(subreq);
 568         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 569             !NT_STATUS_IS_OK(status)) {
 570                 tevent_req_nterror(req, status);
 571                 return;
 572         }
 573
 574         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 575                 state->out_session_id = state->session->global->session_wire_id;
 576                 tevent_req_nterror(req, status);
 577                 return;
 578         }
 579
 580         status = gensec_session_info(state->session->gensec,
 581                                      state->session->global,
 582                                      &state->session_info);
 583         if (tevent_req_nterror(req, status)) {
 584                 return;
 585         }
 586
 587         if ((state->in_previous_session_id != 0) &&
 588              (state->session->global->session_wire_id !=
 589               state->in_previous_session_id))
 590         {
 591                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 592                                                 state->session->connection,
 593                                                 state->session_info,
 594                                                 state->in_previous_session_id,
 595                                                 state->session->global->session_wire_id);
 596                 if (tevent_req_nomem(subreq, req)) {
 597                         return;
 598                 }
 599                 tevent_req_set_callback(subreq,
 600                                         smbd_smb2_session_setup_previous_done,
 601                                         req);
 602                 return;
 603         }
 604
 605         if (state->session->global->auth_session_info != NULL) {
 606                 status = smbd_smb2_reauth_generic_return(state->session,
 607                                                          state->smb2req,
 608                                                          state->session_info,
 609                                                          &state->out_session_flags,
 610                                                          &state->out_session_id);
 611                 if (tevent_req_nterror(req, status)) {
 612                         return;
 613                 }
 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         tevent_req_done(req);
 629         return;
 630 }
 631
 632 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 633 {
 634         struct tevent_req *req =
 635                 tevent_req_callback_data(subreq,
 636                 struct tevent_req);
 637         struct smbd_smb2_session_setup_state *state =
 638                 tevent_req_data(req,
 639                 struct smbd_smb2_session_setup_state);
 640         NTSTATUS status;
 641
 642         status = smb2srv_session_close_previous_recv(subreq);
 643         TALLOC_FREE(subreq);
 644         if (tevent_req_nterror(req, status)) {
 645                 return;
 646         }
 647
 648         if (state->session->global->auth_session_info != NULL) {
 649                 status = smbd_smb2_reauth_generic_return(state->session,
 650                                                          state->smb2req,
 651                                                          state->session_info,
 652                                                          &state->out_session_flags,
 653                                                          &state->out_session_id);
 654                 if (tevent_req_nterror(req, status)) {
 655                         return;
 656                 }
 657                 tevent_req_done(req);
 658                 return;
 659         }
 660
 661         status = smbd_smb2_auth_generic_return(state->session,
 662                                                state->smb2req,
 663                                                state->in_security_mode,
 664                                                state->session_info,
 665                                                &state->out_session_flags,
 666                                                &state->out_session_id);
 667         if (tevent_req_nterror(req, status)) {
 668                 return;
 669         }
 670
 671         tevent_req_done(req);
 672         return;
 673 }
 674
 675 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 676                                         uint16_t *out_session_flags,
 677                                         TALLOC_CTX *mem_ctx,
 678                                         DATA_BLOB *out_security_buffer,
 679                                         uint64_t *out_session_id)
 680 {
 681         struct smbd_smb2_session_setup_state *state =
 682                 tevent_req_data(req,
 683                 struct smbd_smb2_session_setup_state);
 684         NTSTATUS status;
 685
 686         if (tevent_req_is_nterror(req, &status)) {
 687                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 688                         tevent_req_received(req);
 689                         return nt_status_squash(status);
 690                 }
 691         } else {
 692                 status = NT_STATUS_OK;
 693         }
 694
 695         *out_session_flags = state->out_session_flags;
 696         *out_security_buffer = state->out_security_buffer;
 697         *out_session_id = state->out_session_id;
 698
 699         talloc_steal(mem_ctx, out_security_buffer->data);
 700         tevent_req_received(req);
 701         return status;
 702 }
 703
 704 struct smbd_smb2_session_setup_wrap_state {
 705         struct tevent_context *ev;
 706         struct smbd_smb2_request *smb2req;
 707         uint64_t in_session_id;
 708         uint8_t in_flags;
 709         uint8_t in_security_mode;
 710         uint64_t in_previous_session_id;
 711         DATA_BLOB in_security_buffer;
 712         uint16_t out_session_flags;
 713         DATA_BLOB out_security_buffer;
 714         uint64_t out_session_id;
 715         NTSTATUS error;
 716 };
 717
 718 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq);
 719 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq);
 720
 721 static struct tevent_req *smbd_smb2_session_setup_wrap_send(TALLOC_CTX *mem_ctx,
 722                                         struct tevent_context *ev,
 723                                         struct smbd_smb2_request *smb2req,
 724                                         uint64_t in_session_id,
 725                                         uint8_t in_flags,
 726                                         uint8_t in_security_mode,
 727                                         uint64_t in_previous_session_id,
 728                                         DATA_BLOB in_security_buffer)
 729 {
 730         struct tevent_req *req;
 731         struct smbd_smb2_session_setup_wrap_state *state;
 732         struct tevent_req *subreq;
 733
 734         req = tevent_req_create(mem_ctx, &state,
 735                                 struct smbd_smb2_session_setup_wrap_state);
 736         if (req == NULL) {
 737                 return NULL;
 738         }
 739         state->ev = ev;
 740         state->smb2req = smb2req;
 741         state->in_session_id = in_session_id;
 742         state->in_flags = in_flags;
 743         state->in_security_mode = in_security_mode;
 744         state->in_previous_session_id = in_previous_session_id;
 745         state->in_security_buffer = in_security_buffer;
 746
 747         subreq = smbd_smb2_session_setup_send(state, state->ev,
 748                                               state->smb2req,
 749                                               state->in_session_id,
 750                                               state->in_flags,
 751                                               state->in_security_mode,
 752                                               state->in_previous_session_id,
 753                                               state->in_security_buffer);
 754         if (tevent_req_nomem(subreq, req)) {
 755                 return tevent_req_post(req, ev);
 756         }
 757         tevent_req_set_callback(subreq,
 758                                 smbd_smb2_session_setup_wrap_setup_done, req);
 759
 760         return req;
 761 }
 762
 763 static void smbd_smb2_session_setup_wrap_setup_done(struct tevent_req *subreq)
 764 {
 765         struct tevent_req *req =
 766                 tevent_req_callback_data(subreq,
 767                 struct tevent_req);
 768         struct smbd_smb2_session_setup_wrap_state *state =
 769                 tevent_req_data(req,
 770                 struct smbd_smb2_session_setup_wrap_state);
 771         NTSTATUS status;
 772
 773         status = smbd_smb2_session_setup_recv(subreq,
 774                                               &state->out_session_flags,
 775                                               state,
 776                                               &state->out_security_buffer,
 777                                               &state->out_session_id);
 778         TALLOC_FREE(subreq);
 779         if (NT_STATUS_IS_OK(status)) {
 780                 tevent_req_done(req);
 781                 return;
 782         }
 783         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 784                 tevent_req_nterror(req, status);
 785                 return;
 786         }
 787
 788         if (state->smb2req->session == NULL) {
 789                 tevent_req_nterror(req, status);
 790                 return;
 791         }
 792
 793         state->error = status;
 794
 795         subreq = smb2srv_session_shutdown_send(state, state->ev,
 796                                                state->smb2req->session,
 797                                                state->smb2req);
 798         if (tevent_req_nomem(subreq, req)) {
 799                 return;
 800         }
 801         tevent_req_set_callback(subreq,
 802                                 smbd_smb2_session_setup_wrap_shutdown_done,
 803                                 req);
 804 }
 805
 806 static void smbd_smb2_session_setup_wrap_shutdown_done(struct tevent_req *subreq)
 807 {
 808         struct tevent_req *req =
 809                 tevent_req_callback_data(subreq,
 810                 struct tevent_req);
 811         struct smbd_smb2_session_setup_wrap_state *state =
 812                 tevent_req_data(req,
 813                 struct smbd_smb2_session_setup_wrap_state);
 814         NTSTATUS status;
 815
 816         status = smb2srv_session_shutdown_recv(subreq);
 817         TALLOC_FREE(subreq);
 818         if (tevent_req_nterror(req, status)) {
 819                 return;
 820         }
 821
 822         /*
 823          * we may need to sign the response, so we need to keep
 824          * the session until the response is sent to the wire.
 825          */
 826         talloc_steal(state->smb2req, state->smb2req->session);
 827
 828         tevent_req_nterror(req, state->error);
 829 }
 830
 831 static NTSTATUS smbd_smb2_session_setup_wrap_recv(struct tevent_req *req,
 832                                         uint16_t *out_session_flags,
 833                                         TALLOC_CTX *mem_ctx,
 834                                         DATA_BLOB *out_security_buffer,
 835                                         uint64_t *out_session_id)
 836 {
 837         struct smbd_smb2_session_setup_wrap_state *state =
 838                 tevent_req_data(req,
 839                 struct smbd_smb2_session_setup_wrap_state);
 840         NTSTATUS status;
 841
 842         if (tevent_req_is_nterror(req, &status)) {
 843                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 844                         tevent_req_received(req);
 845                         return nt_status_squash(status);
 846                 }
 847         } else {
 848                 status = NT_STATUS_OK;
 849         }
 850
 851         *out_session_flags = state->out_session_flags;
 852         *out_security_buffer = state->out_security_buffer;
 853         *out_session_id = state->out_session_id;
 854
 855         talloc_steal(mem_ctx, out_security_buffer->data);
 856         tevent_req_received(req);
 857         return status;
 858 }
 859
 860 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 861                                         struct tevent_context *ev,
 862                                         struct smbd_smb2_request *smb2req);
 863 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 864 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 865
 866 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 867 {
 868         NTSTATUS status;
 869         struct tevent_req *subreq = NULL;
 870
 871         status = smbd_smb2_request_verify_sizes(req, 0x04);
 872         if (!NT_STATUS_IS_OK(status)) {
 873                 return smbd_smb2_request_error(req, status);
 874         }
 875
 876         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
 877         if (subreq == NULL) {
 878                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 879         }
 880         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
 881
 882         /*
 883          * Wait a long time before going async on this to allow
 884          * requests we're waiting on to finish. Set timeout to 10 secs.
 885          */
 886         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 887 }
 888
 889 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
 890 {
 891         struct smbd_smb2_request *smb2req =
 892                 tevent_req_callback_data(subreq,
 893                 struct smbd_smb2_request);
 894         DATA_BLOB outbody;
 895         NTSTATUS status;
 896         NTSTATUS error;
 897
 898         status = smbd_smb2_logoff_recv(subreq);
 899         TALLOC_FREE(subreq);
 900         if (!NT_STATUS_IS_OK(status)) {
 901                 error = smbd_smb2_request_error(smb2req, status);
 902                 if (!NT_STATUS_IS_OK(error)) {
 903                         smbd_server_connection_terminate(smb2req->sconn,
 904                                                         nt_errstr(error));
 905                         return;
 906                 }
 907                 return;
 908         }
 909
 910         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 911         if (outbody.data == NULL) {
 912                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 913                 if (!NT_STATUS_IS_OK(error)) {
 914                         smbd_server_connection_terminate(smb2req->sconn,
 915                                                         nt_errstr(error));
 916                         return;
 917                 }
 918                 return;
 919         }
 920
 921         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 922         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 923
 924         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 925         if (!NT_STATUS_IS_OK(error)) {
 926                 smbd_server_connection_terminate(smb2req->sconn,
 927                                                 nt_errstr(error));
 928                 return;
 929         }
 930 }
 931
 932 struct smbd_smb2_logoff_state {
 933         struct smbd_smb2_request *smb2req;
 934 };
 935
 936 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
 937
 938 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 939                                         struct tevent_context *ev,
 940                                         struct smbd_smb2_request *smb2req)
 941 {
 942         struct tevent_req *req;
 943         struct smbd_smb2_logoff_state *state;
 944         struct tevent_req *subreq;
 945
 946         req = tevent_req_create(mem_ctx, &state,
 947                         struct smbd_smb2_logoff_state);
 948         if (req == NULL) {
 949                 return NULL;
 950         }
 951         state->smb2req = smb2req;
 952
 953         subreq = smb2srv_session_shutdown_send(state, ev,
 954                                                smb2req->session,
 955                                                smb2req);
 956         if (tevent_req_nomem(subreq, req)) {
 957                 return tevent_req_post(req, ev);
 958         }
 959         tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
 960
 961         return req;
 962 }
 963
 964 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
 965 {
 966         struct tevent_req *req = tevent_req_callback_data(
 967                 subreq, struct tevent_req);
 968         struct smbd_smb2_logoff_state *state = tevent_req_data(
 969                 req, struct smbd_smb2_logoff_state);
 970         NTSTATUS status;
 971
 972         status = smb2srv_session_shutdown_recv(subreq);
 973         if (tevent_req_nterror(req, status)) {
 974                 return;
 975         }
 976         TALLOC_FREE(subreq);
 977
 978         /*
 979          * As we've been awoken, we may have changed
 980          * uid in the meantime. Ensure we're still
 981          * root (SMB2_OP_LOGOFF has .as_root = true).
 982          */
 983         change_to_root_user();
 984
 985         status = smbXsrv_session_logoff(state->smb2req->session);
 986         if (tevent_req_nterror(req, status)) {
 987                 return;
 988         }
 989
 990         /*
 991          * we may need to sign the response, so we need to keep
 992          * the session until the response is sent to the wire.
 993          */
 994         talloc_steal(state->smb2req, state->smb2req->session);
 995
 996         tevent_req_done(req);
 997 }
 998
 999 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
1000 {
1001         return tevent_req_simple_recv_ntstatus(req);
1002 }