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 = 0;
 115         uint64_t out_session_id = 0;
 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->xconn,
 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 = smbd_smb2_generate_outbody(smb2req, 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->xconn,
 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->xconn,
 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         set_current_user_info(session_info->unix_info->sanitized_username,
 334                               session_info->unix_info->unix_name,
 335                               session_info->info->domain_name);
 336
 337         reload_services(smb2req->sconn, conn_snum_used, true);
 338
 339         session->status = NT_STATUS_OK;
 340         session->global->auth_session_info = session_info;
 341         session->global->auth_session_info_seqnum += 1;
 342         session->global->channels[0].auth_session_info_seqnum =
 343                 session->global->auth_session_info_seqnum;
 344         session->global->expiration_time = gensec_expire_time(session->gensec);
 345
 346         if (!session_claim(session)) {
 347                 DEBUG(1, ("smb2: Failed to claim session "
 348                         "for vuid=%llu\n",
 349                         (unsigned long long)session->compat->vuid));
 350                 return NT_STATUS_LOGON_FAILURE;
 351         }
 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         /* The following pointer is owned by state->session. */
 443         struct smbd_smb2_session_setup_state **pp_self_ref;
 444 };
 445
 446 static int pp_self_ref_destructor(struct smbd_smb2_session_setup_state **pp_state)
 447 {
 448         (*pp_state)->session = NULL;
 449         /*
 450          * To make things clearer, ensure the pp_self_ref
 451          * pointer is nulled out. We're never going to
 452          * access this again.
 453          */
 454         (*pp_state)->pp_self_ref = NULL;
 455         return 0;
 456 }
 457
 458 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 459 {
 460         struct smbXsrv_connection *xconn;
 461         struct smbd_smb2_request *preq;
 462
 463         /*
 464          * If state->session is not NULL,
 465          * we move the session from the session table to the request on failure
 466          * so that the error response can be correctly signed, but the session
 467          * is then really deleted when the request is done.
 468          */
 469
 470         if (state->session == NULL) {
 471                 return 0;
 472         }
 473
 474         state->session->status = NT_STATUS_USER_SESSION_DELETED;
 475         state->smb2req->session = talloc_move(state->smb2req, &state->session);
 476
 477         /*
 478          * We've made this session owned by the current request.
 479          * Ensure that any outstanding requests don't also refer
 480          * to it.
 481          */
 482         xconn = state->smb2req->xconn;
 483
 484         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 485                 if (preq == state->smb2req) {
 486                         continue;
 487                 }
 488                 if (preq->session == state->smb2req->session) {
 489                         preq->session = NULL;
 490                         /*
 491                          * If we no longer have a session we can't
 492                          * sign or encrypt replies.
 493                          */
 494                         preq->do_signing = false;
 495                         preq->do_encryption = false;
 496                 }
 497         }
 498
 499         return 0;
 500 }
 501
 502 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 503 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 504 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
 505
 506 /************************************************************************
 507  We have to tag the state->session pointer with memory talloc'ed
 508  on it to ensure it gets NULL'ed out if the underlying struct smbXsrv_session
 509  is deleted by shutdown whilst this request is in flight.
 510 ************************************************************************/
 511
 512 static NTSTATUS tag_state_session_ptr(struct smbd_smb2_session_setup_state *state)
 513 {
 514         state->pp_self_ref = talloc_zero(state->session,
 515                         struct smbd_smb2_session_setup_state *);
 516         if (state->pp_self_ref == NULL) {
 517                 return NT_STATUS_NO_MEMORY;
 518         }
 519         *state->pp_self_ref = state;
 520         talloc_set_destructor(state->pp_self_ref, pp_self_ref_destructor);
 521         return NT_STATUS_OK;
 522 }
 523
 524 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 525                                         struct tevent_context *ev,
 526                                         struct smbd_smb2_request *smb2req,
 527                                         uint64_t in_session_id,
 528                                         uint8_t in_flags,
 529                                         uint8_t in_security_mode,
 530                                         uint64_t in_previous_session_id,
 531                                         DATA_BLOB in_security_buffer)
 532 {
 533         struct tevent_req *req;
 534         struct smbd_smb2_session_setup_state *state;
 535         NTSTATUS status;
 536         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 537         struct tevent_req *subreq;
 538
 539         req = tevent_req_create(mem_ctx, &state,
 540                                 struct smbd_smb2_session_setup_state);
 541         if (req == NULL) {
 542                 return NULL;
 543         }
 544         state->ev = ev;
 545         state->smb2req = smb2req;
 546         state->in_session_id = in_session_id;
 547         state->in_flags = in_flags;
 548         state->in_security_mode = in_security_mode;
 549         state->in_previous_session_id = in_previous_session_id;
 550         state->in_security_buffer = in_security_buffer;
 551
 552         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 553                 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
 554                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 555                         return tevent_req_post(req, ev);
 556                 }
 557
 558                 /*
 559                  * We do not support multi channel.
 560                  */
 561                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 562                 return tevent_req_post(req, ev);
 563         }
 564
 565         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 566
 567         if (state->in_session_id == 0) {
 568                 /* create a new session */
 569                 status = smbXsrv_session_create(state->smb2req->xconn,
 570                                                 now, &state->session);
 571                 if (tevent_req_nterror(req, status)) {
 572                         return tevent_req_post(req, ev);
 573                 }
 574         } else {
 575                 status = smb2srv_session_lookup(state->smb2req->xconn,
 576                                                 state->in_session_id, now,
 577                                                 &state->session);
 578                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 579                         status = NT_STATUS_OK;
 580                 }
 581                 if (NT_STATUS_IS_OK(status)) {
 582                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 583                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 584                         TALLOC_FREE(state->session->gensec);
 585                 }
 586                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 587                         tevent_req_nterror(req, status);
 588                         return tevent_req_post(req, ev);
 589                 }
 590         }
 591
 592         status = tag_state_session_ptr(state);
 593         if (tevent_req_nterror(req, status)) {
 594                 return tevent_req_post(req, ev);
 595         }
 596
 597         if (state->session->gensec == NULL) {
 598                 status = auth_generic_prepare(state->session,
 599                                               state->session->connection->remote_address,
 600                                               &state->session->gensec);
 601                 if (tevent_req_nterror(req, status)) {
 602                         return tevent_req_post(req, ev);
 603                 }
 604
 605                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 606                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 607
 608                 status = gensec_start_mech_by_oid(state->session->gensec,
 609                                                   GENSEC_OID_SPNEGO);
 610                 if (tevent_req_nterror(req, status)) {
 611                         return tevent_req_post(req, ev);
 612                 }
 613         }
 614
 615         become_root();
 616         subreq = gensec_update_send(state, state->ev,
 617                                     state->session->gensec,
 618                                     state->in_security_buffer);
 619         unbecome_root();
 620         if (tevent_req_nomem(subreq, req)) {
 621                 return tevent_req_post(req, ev);
 622         }
 623         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 624
 625         return req;
 626 }
 627
 628 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 629 {
 630         struct tevent_req *req =
 631                 tevent_req_callback_data(subreq,
 632                 struct tevent_req);
 633         struct smbd_smb2_session_setup_state *state =
 634                 tevent_req_data(req,
 635                 struct smbd_smb2_session_setup_state);
 636         NTSTATUS status;
 637
 638         become_root();
 639         status = gensec_update_recv(subreq, state,
 640                                     &state->out_security_buffer);
 641         unbecome_root();
 642         TALLOC_FREE(subreq);
 643         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 644             !NT_STATUS_IS_OK(status)) {
 645                 tevent_req_nterror(req, status);
 646                 return;
 647         }
 648
 649         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 650                 state->out_session_id = state->session->global->session_wire_id;
 651                 /* we want to keep the session */
 652                 state->session = NULL;
 653                 TALLOC_FREE(state->pp_self_ref);
 654                 tevent_req_nterror(req, status);
 655                 return;
 656         }
 657
 658         status = gensec_session_info(state->session->gensec,
 659                                      state->session->global,
 660                                      &state->session_info);
 661         if (tevent_req_nterror(req, status)) {
 662                 return;
 663         }
 664
 665         if ((state->in_previous_session_id != 0) &&
 666              (state->session->global->session_wire_id !=
 667               state->in_previous_session_id))
 668         {
 669                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 670                                                 state->session->connection,
 671                                                 state->session_info,
 672                                                 state->in_previous_session_id,
 673                                                 state->session->global->session_wire_id);
 674                 if (tevent_req_nomem(subreq, req)) {
 675                         return;
 676                 }
 677                 tevent_req_set_callback(subreq,
 678                                         smbd_smb2_session_setup_previous_done,
 679                                         req);
 680                 return;
 681         }
 682
 683         smbd_smb2_session_setup_auth_return(req);
 684 }
 685
 686 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 687 {
 688         struct tevent_req *req =
 689                 tevent_req_callback_data(subreq,
 690                 struct tevent_req);
 691         NTSTATUS status;
 692
 693         status = smb2srv_session_close_previous_recv(subreq);
 694         TALLOC_FREE(subreq);
 695         if (tevent_req_nterror(req, status)) {
 696                 return;
 697         }
 698
 699         smbd_smb2_session_setup_auth_return(req);
 700 }
 701
 702 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
 703 {
 704         struct smbd_smb2_session_setup_state *state =
 705                 tevent_req_data(req,
 706                 struct smbd_smb2_session_setup_state);
 707         NTSTATUS status;
 708
 709         if (state->session->global->auth_session_info != NULL) {
 710                 status = smbd_smb2_reauth_generic_return(state->session,
 711                                                          state->smb2req,
 712                                                          state->session_info,
 713                                                          &state->out_session_flags,
 714                                                          &state->out_session_id);
 715                 if (tevent_req_nterror(req, status)) {
 716                         return;
 717                 }
 718                 /* we want to keep the session */
 719                 state->session = NULL;
 720                 TALLOC_FREE(state->pp_self_ref);
 721                 tevent_req_done(req);
 722                 return;
 723         }
 724
 725         status = smbd_smb2_auth_generic_return(state->session,
 726                                                state->smb2req,
 727                                                state->in_security_mode,
 728                                                state->session_info,
 729                                                &state->out_session_flags,
 730                                                &state->out_session_id);
 731         if (tevent_req_nterror(req, status)) {
 732                 return;
 733         }
 734
 735         /* we want to keep the session */
 736         state->session = NULL;
 737         TALLOC_FREE(state->pp_self_ref);
 738         tevent_req_done(req);
 739         return;
 740 }
 741
 742 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 743                                         uint16_t *out_session_flags,
 744                                         TALLOC_CTX *mem_ctx,
 745                                         DATA_BLOB *out_security_buffer,
 746                                         uint64_t *out_session_id)
 747 {
 748         struct smbd_smb2_session_setup_state *state =
 749                 tevent_req_data(req,
 750                 struct smbd_smb2_session_setup_state);
 751         NTSTATUS status;
 752
 753         if (tevent_req_is_nterror(req, &status)) {
 754                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 755                         tevent_req_received(req);
 756                         return nt_status_squash(status);
 757                 }
 758         } else {
 759                 status = NT_STATUS_OK;
 760         }
 761
 762         *out_session_flags = state->out_session_flags;
 763         *out_security_buffer = state->out_security_buffer;
 764         *out_session_id = state->out_session_id;
 765
 766         talloc_steal(mem_ctx, out_security_buffer->data);
 767         tevent_req_received(req);
 768         return status;
 769 }
 770
 771 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 772                                         struct tevent_context *ev,
 773                                         struct smbd_smb2_request *smb2req);
 774 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 775 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 776
 777 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 778 {
 779         NTSTATUS status;
 780         struct tevent_req *subreq = NULL;
 781
 782         status = smbd_smb2_request_verify_sizes(req, 0x04);
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 return smbd_smb2_request_error(req, status);
 785         }
 786
 787         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
 788         if (subreq == NULL) {
 789                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 790         }
 791         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
 792
 793         /*
 794          * Wait a long time before going async on this to allow
 795          * requests we're waiting on to finish. Set timeout to 10 secs.
 796          */
 797         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 798 }
 799
 800 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
 801 {
 802         struct smbd_smb2_request *smb2req =
 803                 tevent_req_callback_data(subreq,
 804                 struct smbd_smb2_request);
 805         DATA_BLOB outbody;
 806         NTSTATUS status;
 807         NTSTATUS error;
 808
 809         status = smbd_smb2_logoff_recv(subreq);
 810         TALLOC_FREE(subreq);
 811         if (!NT_STATUS_IS_OK(status)) {
 812                 error = smbd_smb2_request_error(smb2req, status);
 813                 if (!NT_STATUS_IS_OK(error)) {
 814                         smbd_server_connection_terminate(smb2req->xconn,
 815                                                         nt_errstr(error));
 816                         return;
 817                 }
 818                 return;
 819         }
 820
 821         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 822         if (outbody.data == NULL) {
 823                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 824                 if (!NT_STATUS_IS_OK(error)) {
 825                         smbd_server_connection_terminate(smb2req->xconn,
 826                                                         nt_errstr(error));
 827                         return;
 828                 }
 829                 return;
 830         }
 831
 832         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 833         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 834
 835         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 836         if (!NT_STATUS_IS_OK(error)) {
 837                 smbd_server_connection_terminate(smb2req->xconn,
 838                                                 nt_errstr(error));
 839                 return;
 840         }
 841 }
 842
 843 struct smbd_smb2_logout_state {
 844         struct smbd_smb2_request *smb2req;
 845         struct tevent_queue *wait_queue;
 846 };
 847
 848 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq);
 849
 850 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 851                                         struct tevent_context *ev,
 852                                         struct smbd_smb2_request *smb2req)
 853 {
 854         struct tevent_req *req;
 855         struct smbd_smb2_logout_state *state;
 856         struct tevent_req *subreq;
 857         struct smbd_smb2_request *preq;
 858         struct smbXsrv_connection *xconn = smb2req->xconn;
 859
 860         req = tevent_req_create(mem_ctx, &state,
 861                         struct smbd_smb2_logout_state);
 862         if (req == NULL) {
 863                 return NULL;
 864         }
 865         state->smb2req = smb2req;
 866
 867         state->wait_queue = tevent_queue_create(state, "logoff_wait_queue");
 868         if (tevent_req_nomem(state->wait_queue, req)) {
 869                 return tevent_req_post(req, ev);
 870         }
 871
 872         /*
 873          * Make sure that no new request will be able to use this session.
 874          */
 875         smb2req->session->status = NT_STATUS_USER_SESSION_DELETED;
 876
 877         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 878                 if (preq == smb2req) {
 879                         /* Can't cancel current request. */
 880                         continue;
 881                 }
 882                 if (preq->session != smb2req->session) {
 883                         /* Request on different session. */
 884                         continue;
 885                 }
 886
 887                 /*
 888                  * Never cancel anything in a compound
 889                  * request. Way too hard to deal with
 890                  * the result.
 891                  */
 892                 if (!preq->compound_related && preq->subreq != NULL) {
 893                         tevent_req_cancel(preq->subreq);
 894                 }
 895
 896                 /*
 897                  * Now wait until the request is finished.
 898                  *
 899                  * We don't set a callback, as we just want to block the
 900                  * wait queue and the talloc_free() of the request will
 901                  * remove the item from the wait queue.
 902                  */
 903                 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 904                 if (tevent_req_nomem(subreq, req)) {
 905                         return tevent_req_post(req, ev);
 906                 }
 907         }
 908
 909         /*
 910          * Now we add our own waiter to the end of the queue,
 911          * this way we get notified when all pending requests are finished
 912          * and send to the socket.
 913          */
 914         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 915         if (tevent_req_nomem(subreq, req)) {
 916                 return tevent_req_post(req, ev);
 917         }
 918         tevent_req_set_callback(subreq, smbd_smb2_logoff_wait_done, req);
 919
 920         return req;
 921 }
 922
 923 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq)
 924 {
 925         struct tevent_req *req = tevent_req_callback_data(
 926                 subreq, struct tevent_req);
 927         struct smbd_smb2_logout_state *state = tevent_req_data(
 928                 req, struct smbd_smb2_logout_state);
 929         NTSTATUS status;
 930
 931         tevent_queue_wait_recv(subreq);
 932         TALLOC_FREE(subreq);
 933
 934         /*
 935          * As we've been awoken, we may have changed
 936          * uid in the meantime. Ensure we're still
 937          * root (SMB2_OP_LOGOFF has .as_root = true).
 938          */
 939         change_to_root_user();
 940
 941         status = smbXsrv_session_logoff(state->smb2req->session);
 942         if (tevent_req_nterror(req, status)) {
 943                 return;
 944         }
 945
 946         /*
 947          * we may need to sign the response, so we need to keep
 948          * the session until the response is sent to the wire.
 949          */
 950         talloc_steal(state->smb2req, state->smb2req->session);
 951
 952         tevent_req_done(req);
 953 }
 954
 955 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
 956 {
 957         return tevent_req_simple_recv_ntstatus(req);
 958 }