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 *xconn = smb2req->xconn;
 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 (!(xconn->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                                  xconn->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 (xconn->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 (xconn->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 (xconn->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 (xconn->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->auth_time = timeval_to_nttime(&smb2req->request_time);
 345         session->global->expiration_time = gensec_expire_time(session->gensec);
 346
 347         if (!session_claim(session)) {
 348                 DEBUG(1, ("smb2: Failed to claim session "
 349                         "for vuid=%llu\n",
 350                         (unsigned long long)session->compat->vuid));
 351                 return NT_STATUS_LOGON_FAILURE;
 352         }
 353
 354         status = smbXsrv_session_update(session);
 355         if (!NT_STATUS_IS_OK(status)) {
 356                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 357                           (unsigned long long)session->compat->vuid,
 358                           nt_errstr(status)));
 359                 return NT_STATUS_LOGON_FAILURE;
 360         }
 361
 362         /*
 363          * we attach the session to the request
 364          * so that the response can be signed
 365          */
 366         smb2req->session = session;
 367         if (!guest) {
 368                 smb2req->do_signing = true;
 369         }
 370
 371         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 372
 373         *out_session_id = session->global->session_wire_id;
 374
 375         return NT_STATUS_OK;
 376 }
 377
 378 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 379                                         struct smbd_smb2_request *smb2req,
 380                                         struct auth_session_info *session_info,
 381                                         uint16_t *out_session_flags,
 382                                         uint64_t *out_session_id)
 383 {
 384         NTSTATUS status;
 385         struct smbXsrv_session *x = session;
 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->auth_time = timeval_to_nttime(&smb2req->request_time);
 413         session->global->expiration_time = gensec_expire_time(session->gensec);
 414
 415         status = smbXsrv_session_update(session);
 416         if (!NT_STATUS_IS_OK(status)) {
 417                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 418                           (unsigned long long)session->compat->vuid,
 419                           nt_errstr(status)));
 420                 return NT_STATUS_LOGON_FAILURE;
 421         }
 422
 423         conn_clear_vuid_caches(smb2req->sconn, session->compat->vuid);
 424
 425         *out_session_id = session->global->session_wire_id;
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 struct smbd_smb2_session_setup_state {
 431         struct tevent_context *ev;
 432         struct smbd_smb2_request *smb2req;
 433         uint64_t in_session_id;
 434         uint8_t in_flags;
 435         uint8_t in_security_mode;
 436         uint64_t in_previous_session_id;
 437         DATA_BLOB in_security_buffer;
 438         struct smbXsrv_session *session;
 439         struct auth_session_info *session_info;
 440         uint16_t out_session_flags;
 441         DATA_BLOB out_security_buffer;
 442         uint64_t out_session_id;
 443         /* The following pointer is owned by state->session. */
 444         struct smbd_smb2_session_setup_state **pp_self_ref;
 445 };
 446
 447 static int pp_self_ref_destructor(struct smbd_smb2_session_setup_state **pp_state)
 448 {
 449         (*pp_state)->session = NULL;
 450         /*
 451          * To make things clearer, ensure the pp_self_ref
 452          * pointer is nulled out. We're never going to
 453          * access this again.
 454          */
 455         (*pp_state)->pp_self_ref = NULL;
 456         return 0;
 457 }
 458
 459 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 460 {
 461         struct smbXsrv_connection *xconn;
 462         struct smbd_smb2_request *preq;
 463
 464         /*
 465          * If state->session is not NULL,
 466          * we move the session from the session table to the request on failure
 467          * so that the error response can be correctly signed, but the session
 468          * is then really deleted when the request is done.
 469          */
 470
 471         if (state->session == NULL) {
 472                 return 0;
 473         }
 474
 475         state->session->status = NT_STATUS_USER_SESSION_DELETED;
 476         state->smb2req->session = talloc_move(state->smb2req, &state->session);
 477
 478         /*
 479          * We own the session now - we don't need the
 480          * tag talloced on session that keeps track of session independently.
 481          */
 482         TALLOC_FREE(state->pp_self_ref);
 483
 484         /*
 485          * We've made this session owned by the current request.
 486          * Ensure that any outstanding requests don't also refer
 487          * to it.
 488          */
 489         xconn = state->smb2req->xconn;
 490
 491         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 492                 if (preq == state->smb2req) {
 493                         continue;
 494                 }
 495                 if (preq->session == state->smb2req->session) {
 496                         preq->session = NULL;
 497                         /*
 498                          * If we no longer have a session we can't
 499                          * sign or encrypt replies.
 500                          */
 501                         preq->do_signing = false;
 502                         preq->do_encryption = false;
 503                 }
 504         }
 505
 506         return 0;
 507 }
 508
 509 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 510 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 511 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
 512
 513 /************************************************************************
 514  We have to tag the state->session pointer with memory talloc'ed
 515  on it to ensure it gets NULL'ed out if the underlying struct smbXsrv_session
 516  is deleted by shutdown whilst this request is in flight.
 517 ************************************************************************/
 518
 519 static NTSTATUS tag_state_session_ptr(struct smbd_smb2_session_setup_state *state)
 520 {
 521         state->pp_self_ref = talloc_zero(state->session,
 522                         struct smbd_smb2_session_setup_state *);
 523         if (state->pp_self_ref == NULL) {
 524                 return NT_STATUS_NO_MEMORY;
 525         }
 526         *state->pp_self_ref = state;
 527         talloc_set_destructor(state->pp_self_ref, pp_self_ref_destructor);
 528         return NT_STATUS_OK;
 529 }
 530
 531 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 532                                         struct tevent_context *ev,
 533                                         struct smbd_smb2_request *smb2req,
 534                                         uint64_t in_session_id,
 535                                         uint8_t in_flags,
 536                                         uint8_t in_security_mode,
 537                                         uint64_t in_previous_session_id,
 538                                         DATA_BLOB in_security_buffer)
 539 {
 540         struct tevent_req *req;
 541         struct smbd_smb2_session_setup_state *state;
 542         NTSTATUS status;
 543         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 544         struct tevent_req *subreq;
 545
 546         req = tevent_req_create(mem_ctx, &state,
 547                                 struct smbd_smb2_session_setup_state);
 548         if (req == NULL) {
 549                 return NULL;
 550         }
 551         state->ev = ev;
 552         state->smb2req = smb2req;
 553         state->in_session_id = in_session_id;
 554         state->in_flags = in_flags;
 555         state->in_security_mode = in_security_mode;
 556         state->in_previous_session_id = in_previous_session_id;
 557         state->in_security_buffer = in_security_buffer;
 558
 559         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 560                 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
 561                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 562                         return tevent_req_post(req, ev);
 563                 }
 564
 565                 /*
 566                  * We do not support multi channel.
 567                  */
 568                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 569                 return tevent_req_post(req, ev);
 570         }
 571
 572         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 573
 574         if (state->in_session_id == 0) {
 575                 /* create a new session */
 576                 status = smbXsrv_session_create(state->smb2req->xconn,
 577                                                 now, &state->session);
 578                 if (tevent_req_nterror(req, status)) {
 579                         return tevent_req_post(req, ev);
 580                 }
 581         } else {
 582                 status = smb2srv_session_lookup(state->smb2req->xconn,
 583                                                 state->in_session_id, now,
 584                                                 &state->session);
 585                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 586                         status = NT_STATUS_OK;
 587                 }
 588                 if (NT_STATUS_IS_OK(status)) {
 589                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 590                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 591                         TALLOC_FREE(state->session->gensec);
 592                 }
 593                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 594                         tevent_req_nterror(req, status);
 595                         return tevent_req_post(req, ev);
 596                 }
 597         }
 598
 599         status = tag_state_session_ptr(state);
 600         if (tevent_req_nterror(req, status)) {
 601                 return tevent_req_post(req, ev);
 602         }
 603
 604         if (state->session->gensec == NULL) {
 605                 status = auth_generic_prepare(state->session,
 606                                               state->smb2req->xconn->remote_address,
 607                                               &state->session->gensec);
 608                 if (tevent_req_nterror(req, status)) {
 609                         return tevent_req_post(req, ev);
 610                 }
 611
 612                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 613                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 614
 615                 status = gensec_start_mech_by_oid(state->session->gensec,
 616                                                   GENSEC_OID_SPNEGO);
 617                 if (tevent_req_nterror(req, status)) {
 618                         return tevent_req_post(req, ev);
 619                 }
 620         }
 621
 622         become_root();
 623         subreq = gensec_update_send(state, state->ev,
 624                                     state->session->gensec,
 625                                     state->in_security_buffer);
 626         unbecome_root();
 627         if (tevent_req_nomem(subreq, req)) {
 628                 return tevent_req_post(req, ev);
 629         }
 630         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 631
 632         return req;
 633 }
 634
 635 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 636 {
 637         struct tevent_req *req =
 638                 tevent_req_callback_data(subreq,
 639                 struct tevent_req);
 640         struct smbd_smb2_session_setup_state *state =
 641                 tevent_req_data(req,
 642                 struct smbd_smb2_session_setup_state);
 643         NTSTATUS status;
 644
 645         become_root();
 646         status = gensec_update_recv(subreq, state,
 647                                     &state->out_security_buffer);
 648         unbecome_root();
 649         TALLOC_FREE(subreq);
 650         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 651             !NT_STATUS_IS_OK(status)) {
 652                 tevent_req_nterror(req, status);
 653                 return;
 654         }
 655
 656         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 657                 state->out_session_id = state->session->global->session_wire_id;
 658                 /* we want to keep the session */
 659                 state->session = NULL;
 660                 TALLOC_FREE(state->pp_self_ref);
 661                 tevent_req_nterror(req, status);
 662                 return;
 663         }
 664
 665         status = gensec_session_info(state->session->gensec,
 666                                      state->session->global,
 667                                      &state->session_info);
 668         if (tevent_req_nterror(req, status)) {
 669                 return;
 670         }
 671
 672         if ((state->in_previous_session_id != 0) &&
 673              (state->session->global->session_wire_id !=
 674               state->in_previous_session_id))
 675         {
 676                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 677                                                 state->smb2req->xconn,
 678                                                 state->session_info,
 679                                                 state->in_previous_session_id,
 680                                                 state->session->global->session_wire_id);
 681                 if (tevent_req_nomem(subreq, req)) {
 682                         return;
 683                 }
 684                 tevent_req_set_callback(subreq,
 685                                         smbd_smb2_session_setup_previous_done,
 686                                         req);
 687                 return;
 688         }
 689
 690         smbd_smb2_session_setup_auth_return(req);
 691 }
 692
 693 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 694 {
 695         struct tevent_req *req =
 696                 tevent_req_callback_data(subreq,
 697                 struct tevent_req);
 698         NTSTATUS status;
 699
 700         status = smb2srv_session_close_previous_recv(subreq);
 701         TALLOC_FREE(subreq);
 702         if (tevent_req_nterror(req, status)) {
 703                 return;
 704         }
 705
 706         smbd_smb2_session_setup_auth_return(req);
 707 }
 708
 709 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
 710 {
 711         struct smbd_smb2_session_setup_state *state =
 712                 tevent_req_data(req,
 713                 struct smbd_smb2_session_setup_state);
 714         NTSTATUS status;
 715
 716         if (state->session->global->auth_session_info != NULL) {
 717                 status = smbd_smb2_reauth_generic_return(state->session,
 718                                                          state->smb2req,
 719                                                          state->session_info,
 720                                                          &state->out_session_flags,
 721                                                          &state->out_session_id);
 722                 if (tevent_req_nterror(req, status)) {
 723                         return;
 724                 }
 725                 /* we want to keep the session */
 726                 state->session = NULL;
 727                 TALLOC_FREE(state->pp_self_ref);
 728                 tevent_req_done(req);
 729                 return;
 730         }
 731
 732         status = smbd_smb2_auth_generic_return(state->session,
 733                                                state->smb2req,
 734                                                state->in_security_mode,
 735                                                state->session_info,
 736                                                &state->out_session_flags,
 737                                                &state->out_session_id);
 738         if (tevent_req_nterror(req, status)) {
 739                 return;
 740         }
 741
 742         /* we want to keep the session */
 743         state->session = NULL;
 744         TALLOC_FREE(state->pp_self_ref);
 745         tevent_req_done(req);
 746         return;
 747 }
 748
 749 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 750                                         uint16_t *out_session_flags,
 751                                         TALLOC_CTX *mem_ctx,
 752                                         DATA_BLOB *out_security_buffer,
 753                                         uint64_t *out_session_id)
 754 {
 755         struct smbd_smb2_session_setup_state *state =
 756                 tevent_req_data(req,
 757                 struct smbd_smb2_session_setup_state);
 758         NTSTATUS status;
 759
 760         if (tevent_req_is_nterror(req, &status)) {
 761                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 762                         tevent_req_received(req);
 763                         return nt_status_squash(status);
 764                 }
 765         } else {
 766                 status = NT_STATUS_OK;
 767         }
 768
 769         *out_session_flags = state->out_session_flags;
 770         *out_security_buffer = state->out_security_buffer;
 771         *out_session_id = state->out_session_id;
 772
 773         talloc_steal(mem_ctx, out_security_buffer->data);
 774         tevent_req_received(req);
 775         return status;
 776 }
 777
 778 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 779                                         struct tevent_context *ev,
 780                                         struct smbd_smb2_request *smb2req);
 781 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 782 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 783
 784 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 785 {
 786         NTSTATUS status;
 787         struct tevent_req *subreq = NULL;
 788
 789         status = smbd_smb2_request_verify_sizes(req, 0x04);
 790         if (!NT_STATUS_IS_OK(status)) {
 791                 return smbd_smb2_request_error(req, status);
 792         }
 793
 794         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
 795         if (subreq == NULL) {
 796                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 797         }
 798         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
 799
 800         /*
 801          * Wait a long time before going async on this to allow
 802          * requests we're waiting on to finish. Set timeout to 10 secs.
 803          */
 804         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 805 }
 806
 807 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
 808 {
 809         struct smbd_smb2_request *smb2req =
 810                 tevent_req_callback_data(subreq,
 811                 struct smbd_smb2_request);
 812         DATA_BLOB outbody;
 813         NTSTATUS status;
 814         NTSTATUS error;
 815
 816         status = smbd_smb2_logoff_recv(subreq);
 817         TALLOC_FREE(subreq);
 818         if (!NT_STATUS_IS_OK(status)) {
 819                 error = smbd_smb2_request_error(smb2req, status);
 820                 if (!NT_STATUS_IS_OK(error)) {
 821                         smbd_server_connection_terminate(smb2req->xconn,
 822                                                         nt_errstr(error));
 823                         return;
 824                 }
 825                 return;
 826         }
 827
 828         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 829         if (outbody.data == NULL) {
 830                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 831                 if (!NT_STATUS_IS_OK(error)) {
 832                         smbd_server_connection_terminate(smb2req->xconn,
 833                                                         nt_errstr(error));
 834                         return;
 835                 }
 836                 return;
 837         }
 838
 839         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 840         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 841
 842         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 843         if (!NT_STATUS_IS_OK(error)) {
 844                 smbd_server_connection_terminate(smb2req->xconn,
 845                                                 nt_errstr(error));
 846                 return;
 847         }
 848 }
 849
 850 struct smbd_smb2_logout_state {
 851         struct smbd_smb2_request *smb2req;
 852         struct tevent_queue *wait_queue;
 853 };
 854
 855 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq);
 856
 857 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 858                                         struct tevent_context *ev,
 859                                         struct smbd_smb2_request *smb2req)
 860 {
 861         struct tevent_req *req;
 862         struct smbd_smb2_logout_state *state;
 863         struct tevent_req *subreq;
 864         struct smbd_smb2_request *preq;
 865         struct smbXsrv_connection *xconn = smb2req->xconn;
 866
 867         req = tevent_req_create(mem_ctx, &state,
 868                         struct smbd_smb2_logout_state);
 869         if (req == NULL) {
 870                 return NULL;
 871         }
 872         state->smb2req = smb2req;
 873
 874         state->wait_queue = tevent_queue_create(state, "logoff_wait_queue");
 875         if (tevent_req_nomem(state->wait_queue, req)) {
 876                 return tevent_req_post(req, ev);
 877         }
 878
 879         /*
 880          * Make sure that no new request will be able to use this session.
 881          */
 882         smb2req->session->status = NT_STATUS_USER_SESSION_DELETED;
 883
 884         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 885                 if (preq == smb2req) {
 886                         /* Can't cancel current request. */
 887                         continue;
 888                 }
 889                 if (preq->session != smb2req->session) {
 890                         /* Request on different session. */
 891                         continue;
 892                 }
 893
 894                 /*
 895                  * Never cancel anything in a compound
 896                  * request. Way too hard to deal with
 897                  * the result.
 898                  */
 899                 if (!preq->compound_related && preq->subreq != NULL) {
 900                         tevent_req_cancel(preq->subreq);
 901                 }
 902
 903                 /*
 904                  * Now wait until the request is finished.
 905                  *
 906                  * We don't set a callback, as we just want to block the
 907                  * wait queue and the talloc_free() of the request will
 908                  * remove the item from the wait queue.
 909                  */
 910                 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 911                 if (tevent_req_nomem(subreq, req)) {
 912                         return tevent_req_post(req, ev);
 913                 }
 914         }
 915
 916         /*
 917          * Now we add our own waiter to the end of the queue,
 918          * this way we get notified when all pending requests are finished
 919          * and send to the socket.
 920          */
 921         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 922         if (tevent_req_nomem(subreq, req)) {
 923                 return tevent_req_post(req, ev);
 924         }
 925         tevent_req_set_callback(subreq, smbd_smb2_logoff_wait_done, req);
 926
 927         return req;
 928 }
 929
 930 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq)
 931 {
 932         struct tevent_req *req = tevent_req_callback_data(
 933                 subreq, struct tevent_req);
 934         struct smbd_smb2_logout_state *state = tevent_req_data(
 935                 req, struct smbd_smb2_logout_state);
 936         NTSTATUS status;
 937
 938         tevent_queue_wait_recv(subreq);
 939         TALLOC_FREE(subreq);
 940
 941         /*
 942          * As we've been awoken, we may have changed
 943          * uid in the meantime. Ensure we're still
 944          * root (SMB2_OP_LOGOFF has .as_root = true).
 945          */
 946         change_to_root_user();
 947
 948         status = smbXsrv_session_logoff(state->smb2req->session);
 949         if (tevent_req_nterror(req, status)) {
 950                 return;
 951         }
 952
 953         /*
 954          * we may need to sign the response, so we need to keep
 955          * the session until the response is sent to the wire.
 956          */
 957         talloc_steal(state->smb2req, state->smb2req->session);
 958
 959         tevent_req_done(req);
 960 }
 961
 962 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
 963 {
 964         return tevent_req_simple_recv_ntstatus(req);
 965 }