source3/smbd/smb2_sesssetup.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   6    Copyright (C) Jeremy Allison 2010
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "includes.h"
  23 #include "smbd/smbd.h"
  24 #include "smbd/globals.h"
  25 #include "../libcli/smb/smb_common.h"
  26 #include "../auth/gensec/gensec.h"
  27 #include "auth.h"
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "../libcli/security/security.h"
  30 #include "../lib/util/tevent_ntstatus.h"
  31
  32 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
  33                                         struct tevent_context *ev,
  34                                         struct smbd_smb2_request *smb2req,
  35                                         uint64_t in_session_id,
  36                                         uint8_t in_flags,
  37                                         uint8_t in_security_mode,
  38                                         uint64_t in_previous_session_id,
  39                                         DATA_BLOB in_security_buffer);
  40 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
  41                                         uint16_t *out_session_flags,
  42                                         TALLOC_CTX *mem_ctx,
  43                                         DATA_BLOB *out_security_buffer,
  44                                         uint64_t *out_session_id);
  45
  46 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq);
  47
  48 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  49 {
  50         const uint8_t *inhdr;
  51         const uint8_t *inbody;
  52         uint64_t in_session_id;
  53         uint8_t in_flags;
  54         uint8_t in_security_mode;
  55         uint64_t in_previous_session_id;
  56         uint16_t in_security_offset;
  57         uint16_t in_security_length;
  58         DATA_BLOB in_security_buffer;
  59         NTSTATUS status;
  60         struct tevent_req *subreq;
  61
  62         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  63         if (!NT_STATUS_IS_OK(status)) {
  64                 return smbd_smb2_request_error(smb2req, status);
  65         }
  66         inhdr = SMBD_SMB2_IN_HDR_PTR(smb2req);
  67         inbody = SMBD_SMB2_IN_BODY_PTR(smb2req);
  68
  69         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  70
  71         in_flags = CVAL(inbody, 0x02);
  72         in_security_mode = CVAL(inbody, 0x03);
  73         /* Capabilities = IVAL(inbody, 0x04) */
  74         /* Channel = IVAL(inbody, 0x08) */
  75         in_security_offset = SVAL(inbody, 0x0C);
  76         in_security_length = SVAL(inbody, 0x0E);
  77         in_previous_session_id = BVAL(inbody, 0x10);
  78
  79         if (in_security_offset != (SMB2_HDR_BODY + SMBD_SMB2_IN_BODY_LEN(smb2req))) {
  80                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (in_security_length > SMBD_SMB2_IN_DYN_LEN(smb2req)) {
  84                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_security_buffer.data = SMBD_SMB2_IN_DYN_PTR(smb2req);
  88         in_security_buffer.length = in_security_length;
  89
  90         subreq = smbd_smb2_session_setup_send(smb2req,
  91                                               smb2req->sconn->ev_ctx,
  92                                               smb2req,
  93                                               in_session_id,
  94                                               in_flags,
  95                                               in_security_mode,
  96                                               in_previous_session_id,
  97                                               in_security_buffer);
  98         if (subreq == NULL) {
  99                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 100         }
 101         tevent_req_set_callback(subreq, smbd_smb2_request_sesssetup_done, smb2req);
 102
 103         return smbd_smb2_request_pending_queue(smb2req, subreq, 500);
 104 }
 105
 106 static void smbd_smb2_request_sesssetup_done(struct tevent_req *subreq)
 107 {
 108         struct smbd_smb2_request *smb2req =
 109                 tevent_req_callback_data(subreq,
 110                 struct smbd_smb2_request);
 111         uint8_t *outhdr;
 112         DATA_BLOB outbody;
 113         DATA_BLOB outdyn;
 114         uint16_t out_session_flags;
 115         uint64_t out_session_id;
 116         uint16_t out_security_offset;
 117         DATA_BLOB out_security_buffer = data_blob_null;
 118         NTSTATUS status;
 119         NTSTATUS error; /* transport error */
 120
 121         status = smbd_smb2_session_setup_recv(subreq,
 122                                               &out_session_flags,
 123                                               smb2req,
 124                                               &out_security_buffer,
 125                                               &out_session_id);
 126         TALLOC_FREE(subreq);
 127         if (!NT_STATUS_IS_OK(status) &&
 128             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 129                 status = nt_status_squash(status);
 130                 error = smbd_smb2_request_error(smb2req, status);
 131                 if (!NT_STATUS_IS_OK(error)) {
 132                         smbd_server_connection_terminate(smb2req->sconn,
 133                                                          nt_errstr(error));
 134                         return;
 135                 }
 136                 return;
 137         }
 138
 139         out_security_offset = SMB2_HDR_BODY + 0x08;
 140
 141         outhdr = SMBD_SMB2_OUT_HDR_PTR(smb2req);
 142
 143         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 144         if (outbody.data == NULL) {
 145                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 146                 if (!NT_STATUS_IS_OK(error)) {
 147                         smbd_server_connection_terminate(smb2req->sconn,
 148                                                          nt_errstr(error));
 149                         return;
 150                 }
 151                 return;
 152         }
 153
 154         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 155
 156         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 157         SSVAL(outbody.data, 0x02,
 158               out_session_flags);               /* session flags */
 159         SSVAL(outbody.data, 0x04,
 160               out_security_offset);             /* security buffer offset */
 161         SSVAL(outbody.data, 0x06,
 162               out_security_buffer.length);      /* security buffer length */
 163
 164         outdyn = out_security_buffer;
 165
 166         error = smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 167                                            __location__);
 168         if (!NT_STATUS_IS_OK(error)) {
 169                 smbd_server_connection_terminate(smb2req->sconn,
 170                                                  nt_errstr(error));
 171                 return;
 172         }
 173 }
 174
 175 static NTSTATUS smbd_smb2_auth_generic_return(struct smbXsrv_session *session,
 176                                         struct smbd_smb2_request *smb2req,
 177                                         uint8_t in_security_mode,
 178                                         struct auth_session_info *session_info,
 179                                         uint16_t *out_session_flags,
 180                                         uint64_t *out_session_id)
 181 {
 182         NTSTATUS status;
 183         bool guest = false;
 184         uint8_t session_key[16];
 185         struct smbXsrv_session *x = session;
 186         struct smbXsrv_connection *conn = session->connection;
 187
 188         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 189             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 190                 x->global->signing_required = true;
 191         }
 192
 193         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 194                 x->global->encryption_required = true;
 195         }
 196
 197         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 198                 /* we map anonymous to guest internally */
 199                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 200                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 201                 /* force no signing */
 202                 x->global->signing_required = false;
 203                 guest = true;
 204         }
 205
 206         if (guest && x->global->encryption_required) {
 207                 DEBUG(1,("reject guest session as encryption is required\n"));
 208                 return NT_STATUS_ACCESS_DENIED;
 209         }
 210
 211         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 212                 if (x->global->encryption_required) {
 213                         DEBUG(1,("reject session with dialect[0x%04X] "
 214                                  "as encryption is required\n",
 215                                  conn->smb2.server.dialect));
 216                         return NT_STATUS_ACCESS_DENIED;
 217                 }
 218         }
 219
 220         if (x->global->encryption_required) {
 221                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 222         }
 223
 224         ZERO_STRUCT(session_key);
 225         memcpy(session_key, session_info->session_key.data,
 226                MIN(session_info->session_key.length, sizeof(session_key)));
 227
 228         x->global->signing_key = data_blob_talloc(x->global,
 229                                                   session_key,
 230                                                   sizeof(session_key));
 231         if (x->global->signing_key.data == NULL) {
 232                 ZERO_STRUCT(session_key);
 233                 return NT_STATUS_NO_MEMORY;
 234         }
 235
 236         if (conn->protocol >= PROTOCOL_SMB2_24) {
 237                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 238                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 239
 240                 smb2_key_derivation(session_key, sizeof(session_key),
 241                                     label.data, label.length,
 242                                     context.data, context.length,
 243                                     x->global->signing_key.data);
 244         }
 245
 246         if (conn->protocol >= PROTOCOL_SMB2_24) {
 247                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 248                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
 249
 250                 x->global->decryption_key = data_blob_talloc(x->global,
 251                                                              session_key,
 252                                                              sizeof(session_key));
 253                 if (x->global->decryption_key.data == NULL) {
 254                         ZERO_STRUCT(session_key);
 255                         return NT_STATUS_NO_MEMORY;
 256                 }
 257
 258                 smb2_key_derivation(session_key, sizeof(session_key),
 259                                     label.data, label.length,
 260                                     context.data, context.length,
 261                                     x->global->decryption_key.data);
 262         }
 263
 264         if (conn->protocol >= PROTOCOL_SMB2_24) {
 265                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 266                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
 267
 268                 x->global->encryption_key = data_blob_talloc(x->global,
 269                                                              session_key,
 270                                                              sizeof(session_key));
 271                 if (x->global->encryption_key.data == NULL) {
 272                         ZERO_STRUCT(session_key);
 273                         return NT_STATUS_NO_MEMORY;
 274                 }
 275
 276                 smb2_key_derivation(session_key, sizeof(session_key),
 277                                     label.data, label.length,
 278                                     context.data, context.length,
 279                                     x->global->encryption_key.data);
 280
 281                 generate_random_buffer((uint8_t *)&x->nonce_high, sizeof(x->nonce_high));
 282                 x->nonce_low = 1;
 283         }
 284
 285         x->global->application_key = data_blob_dup_talloc(x->global,
 286                                                 x->global->signing_key);
 287         if (x->global->application_key.data == NULL) {
 288                 ZERO_STRUCT(session_key);
 289                 return NT_STATUS_NO_MEMORY;
 290         }
 291
 292         if (conn->protocol >= PROTOCOL_SMB2_24) {
 293                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 294                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 295
 296                 smb2_key_derivation(session_key, sizeof(session_key),
 297                                     label.data, label.length,
 298                                     context.data, context.length,
 299                                     x->global->application_key.data);
 300         }
 301         ZERO_STRUCT(session_key);
 302
 303         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 304                                                 x->global->signing_key);
 305         if (x->global->channels[0].signing_key.data == NULL) {
 306                 return NT_STATUS_NO_MEMORY;
 307         }
 308
 309         data_blob_clear_free(&session_info->session_key);
 310         session_info->session_key = data_blob_dup_talloc(session_info,
 311                                                 x->global->application_key);
 312         if (session_info->session_key.data == NULL) {
 313                 return NT_STATUS_NO_MEMORY;
 314         }
 315
 316         session->compat = talloc_zero(session, struct user_struct);
 317         if (session->compat == NULL) {
 318                 return NT_STATUS_NO_MEMORY;
 319         }
 320         session->compat->session = session;
 321         session->compat->homes_snum = -1;
 322         session->compat->session_info = session_info;
 323         session->compat->session_keystr = NULL;
 324         session->compat->vuid = session->global->session_wire_id;
 325         DLIST_ADD(smb2req->sconn->users, session->compat);
 326         smb2req->sconn->num_users++;
 327
 328         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 329                 session->compat->homes_snum =
 330                         register_homes_share(session_info->unix_info->unix_name);
 331         }
 332
 333         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         if (!guest) {
 366                 smb2req->do_signing = true;
 367         }
 368
 369         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 370
 371         *out_session_id = session->global->session_wire_id;
 372
 373         return NT_STATUS_OK;
 374 }
 375
 376 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 377                                         struct smbd_smb2_request *smb2req,
 378                                         struct auth_session_info *session_info,
 379                                         uint16_t *out_session_flags,
 380                                         uint64_t *out_session_id)
 381 {
 382         NTSTATUS status;
 383         struct smbXsrv_session *x = session;
 384         struct smbXsrv_connection *conn = session->connection;
 385
 386         data_blob_clear_free(&session_info->session_key);
 387         session_info->session_key = data_blob_dup_talloc(session_info,
 388                                                 x->global->application_key);
 389         if (session_info->session_key.data == NULL) {
 390                 return NT_STATUS_NO_MEMORY;
 391         }
 392
 393         session->compat->session_info = session_info;
 394         session->compat->vuid = session->global->session_wire_id;
 395
 396         session->compat->homes_snum =
 397                         register_homes_share(session_info->unix_info->unix_name);
 398
 399         set_current_user_info(session_info->unix_info->sanitized_username,
 400                               session_info->unix_info->unix_name,
 401                               session_info->info->domain_name);
 402
 403         reload_services(smb2req->sconn, conn_snum_used, true);
 404
 405         session->status = NT_STATUS_OK;
 406         TALLOC_FREE(session->global->auth_session_info);
 407         session->global->auth_session_info = session_info;
 408         session->global->auth_session_info_seqnum += 1;
 409         session->global->channels[0].auth_session_info_seqnum =
 410                 session->global->auth_session_info_seqnum;
 411         session->global->expiration_time = gensec_expire_time(session->gensec);
 412
 413         status = smbXsrv_session_update(session);
 414         if (!NT_STATUS_IS_OK(status)) {
 415                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 416                           (unsigned long long)session->compat->vuid,
 417                           nt_errstr(status)));
 418                 return NT_STATUS_LOGON_FAILURE;
 419         }
 420
 421         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 422
 423         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 424                 smb2req->do_signing = true;
 425         }
 426
 427         *out_session_id = session->global->session_wire_id;
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 struct smbd_smb2_session_setup_state {
 433         struct tevent_context *ev;
 434         struct smbd_smb2_request *smb2req;
 435         uint64_t in_session_id;
 436         uint8_t in_flags;
 437         uint8_t in_security_mode;
 438         uint64_t in_previous_session_id;
 439         DATA_BLOB in_security_buffer;
 440         struct smbXsrv_session *session;
 441         struct auth_session_info *session_info;
 442         uint16_t out_session_flags;
 443         DATA_BLOB out_security_buffer;
 444         uint64_t out_session_id;
 445         /* The following pointer is owned by state->session. */
 446         struct smbd_smb2_session_setup_state **pp_self_ref;
 447 };
 448
 449 static int pp_self_ref_destructor(struct smbd_smb2_session_setup_state **pp_state)
 450 {
 451         (*pp_state)->session = NULL;
 452         /*
 453          * To make things clearer, ensure the pp_self_ref
 454          * pointer is nulled out. We're never going to
 455          * access this again.
 456          */
 457         (*pp_state)->pp_self_ref = NULL;
 458         return 0;
 459 }
 460
 461 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 462 {
 463         /*
 464          * if state->session is not NULL,
 465          * we remove the session on failure
 466          */
 467         TALLOC_FREE(state->session);
 468         return 0;
 469 }
 470
 471 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 472 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 473
 474 /************************************************************************
 475  We have to tag the state->session pointer with memory talloc'ed
 476  on it to ensure it gets NULL'ed out if the underlying struct smbXsrv_session
 477  is deleted by shutdown whilst this request is in flight.
 478 ************************************************************************/
 479
 480 static NTSTATUS tag_state_session_ptr(struct smbd_smb2_session_setup_state *state)
 481 {
 482         state->pp_self_ref = talloc_zero(state->session,
 483                         struct smbd_smb2_session_setup_state *);
 484         if (state->pp_self_ref == NULL) {
 485                 return NT_STATUS_NO_MEMORY;
 486         }
 487         *state->pp_self_ref = state;
 488         talloc_set_destructor(state->pp_self_ref, pp_self_ref_destructor);
 489         return NT_STATUS_OK;
 490 }
 491
 492 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 493                                         struct tevent_context *ev,
 494                                         struct smbd_smb2_request *smb2req,
 495                                         uint64_t in_session_id,
 496                                         uint8_t in_flags,
 497                                         uint8_t in_security_mode,
 498                                         uint64_t in_previous_session_id,
 499                                         DATA_BLOB in_security_buffer)
 500 {
 501         struct tevent_req *req;
 502         struct smbd_smb2_session_setup_state *state;
 503         NTSTATUS status;
 504         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 505         struct tevent_req *subreq;
 506
 507         req = tevent_req_create(mem_ctx, &state,
 508                                 struct smbd_smb2_session_setup_state);
 509         if (req == NULL) {
 510                 return NULL;
 511         }
 512         state->ev = ev;
 513         state->smb2req = smb2req;
 514         state->in_session_id = in_session_id;
 515         state->in_flags = in_flags;
 516         state->in_security_mode = in_security_mode;
 517         state->in_previous_session_id = in_previous_session_id;
 518         state->in_security_buffer = in_security_buffer;
 519
 520         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 521                 if (smb2req->sconn->conn->protocol < PROTOCOL_SMB2_22) {
 522                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 523                         return tevent_req_post(req, ev);
 524                 }
 525
 526                 /*
 527                  * We do not support multi channel.
 528                  */
 529                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 530                 return tevent_req_post(req, ev);
 531         }
 532
 533         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 534
 535         if (state->in_session_id == 0) {
 536                 /* create a new session */
 537                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 538                                                 now, &state->session);
 539                 if (tevent_req_nterror(req, status)) {
 540                         return tevent_req_post(req, ev);
 541                 }
 542                 smb2req->session = state->session;
 543         } else {
 544                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 545                                                 state->in_session_id, now,
 546                                                 &state->session);
 547                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 548                         status = NT_STATUS_OK;
 549                 }
 550                 if (NT_STATUS_IS_OK(status)) {
 551                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 552                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 553                         TALLOC_FREE(state->session->gensec);
 554                 }
 555                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 556                         tevent_req_nterror(req, status);
 557                         return tevent_req_post(req, ev);
 558                 }
 559         }
 560
 561         status = tag_state_session_ptr(state);
 562         if (tevent_req_nterror(req, status)) {
 563                 return tevent_req_post(req, ev);
 564         }
 565
 566         if (state->session->gensec == NULL) {
 567                 status = auth_generic_prepare(state->session,
 568                                               state->session->connection->remote_address,
 569                                               &state->session->gensec);
 570                 if (tevent_req_nterror(req, status)) {
 571                         return tevent_req_post(req, ev);
 572                 }
 573
 574                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 575                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 576
 577                 status = gensec_start_mech_by_oid(state->session->gensec,
 578                                                   GENSEC_OID_SPNEGO);
 579                 if (tevent_req_nterror(req, status)) {
 580                         return tevent_req_post(req, ev);
 581                 }
 582         }
 583
 584         become_root();
 585         subreq = gensec_update_send(state, state->ev,
 586                                     state->session->gensec,
 587                                     state->in_security_buffer);
 588         unbecome_root();
 589         if (tevent_req_nomem(subreq, req)) {
 590                 return tevent_req_post(req, ev);
 591         }
 592         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 593
 594         return req;
 595 }
 596
 597 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 598 {
 599         struct tevent_req *req =
 600                 tevent_req_callback_data(subreq,
 601                 struct tevent_req);
 602         struct smbd_smb2_session_setup_state *state =
 603                 tevent_req_data(req,
 604                 struct smbd_smb2_session_setup_state);
 605         NTSTATUS status;
 606
 607         become_root();
 608         status = gensec_update_recv(subreq, state,
 609                                     &state->out_security_buffer);
 610         unbecome_root();
 611         TALLOC_FREE(subreq);
 612         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 613             !NT_STATUS_IS_OK(status)) {
 614                 tevent_req_nterror(req, status);
 615                 return;
 616         }
 617
 618         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 619                 state->out_session_id = state->session->global->session_wire_id;
 620                 /* we want to keep the session */
 621                 TALLOC_FREE(state->pp_self_ref);
 622                 tevent_req_nterror(req, status);
 623                 return;
 624         }
 625
 626         status = gensec_session_info(state->session->gensec,
 627                                      state->session->global,
 628                                      &state->session_info);
 629         if (tevent_req_nterror(req, status)) {
 630                 return;
 631         }
 632
 633         if ((state->in_previous_session_id != 0) &&
 634              (state->session->global->session_wire_id !=
 635               state->in_previous_session_id))
 636         {
 637                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 638                                                 state->session->connection,
 639                                                 state->session_info,
 640                                                 state->in_previous_session_id,
 641                                                 state->session->global->session_wire_id);
 642                 if (tevent_req_nomem(subreq, req)) {
 643                         return;
 644                 }
 645                 tevent_req_set_callback(subreq,
 646                                         smbd_smb2_session_setup_previous_done,
 647                                         req);
 648                 return;
 649         }
 650
 651         if (state->session->global->auth_session_info != NULL) {
 652                 status = smbd_smb2_reauth_generic_return(state->session,
 653                                                          state->smb2req,
 654                                                          state->session_info,
 655                                                          &state->out_session_flags,
 656                                                          &state->out_session_id);
 657                 if (tevent_req_nterror(req, status)) {
 658                         return;
 659                 }
 660                 /* we want to keep the session */
 661                 TALLOC_FREE(state->pp_self_ref);
 662                 tevent_req_done(req);
 663                 return;
 664         }
 665
 666         status = smbd_smb2_auth_generic_return(state->session,
 667                                                state->smb2req,
 668                                                state->in_security_mode,
 669                                                state->session_info,
 670                                                &state->out_session_flags,
 671                                                &state->out_session_id);
 672         if (tevent_req_nterror(req, status)) {
 673                 return;
 674         }
 675
 676         /* we want to keep the session */
 677         TALLOC_FREE(state->pp_self_ref);
 678         tevent_req_done(req);
 679         return;
 680 }
 681
 682 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 683 {
 684         struct tevent_req *req =
 685                 tevent_req_callback_data(subreq,
 686                 struct tevent_req);
 687         struct smbd_smb2_session_setup_state *state =
 688                 tevent_req_data(req,
 689                 struct smbd_smb2_session_setup_state);
 690         NTSTATUS status;
 691
 692         status = smb2srv_session_close_previous_recv(subreq);
 693         TALLOC_FREE(subreq);
 694         if (tevent_req_nterror(req, status)) {
 695                 return;
 696         }
 697
 698         if (state->session->global->auth_session_info != NULL) {
 699                 status = smbd_smb2_reauth_generic_return(state->session,
 700                                                          state->smb2req,
 701                                                          state->session_info,
 702                                                          &state->out_session_flags,
 703                                                          &state->out_session_id);
 704                 if (tevent_req_nterror(req, status)) {
 705                         return;
 706                 }
 707                 /* we want to keep the session */
 708                 TALLOC_FREE(state->pp_self_ref);
 709                 tevent_req_done(req);
 710                 return;
 711         }
 712
 713         status = smbd_smb2_auth_generic_return(state->session,
 714                                                state->smb2req,
 715                                                state->in_security_mode,
 716                                                state->session_info,
 717                                                &state->out_session_flags,
 718                                                &state->out_session_id);
 719         if (tevent_req_nterror(req, status)) {
 720                 return;
 721         }
 722
 723         /* we want to keep the session */
 724         TALLOC_FREE(state->pp_self_ref);
 725         tevent_req_done(req);
 726         return;
 727 }
 728
 729 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 730                                         uint16_t *out_session_flags,
 731                                         TALLOC_CTX *mem_ctx,
 732                                         DATA_BLOB *out_security_buffer,
 733                                         uint64_t *out_session_id)
 734 {
 735         struct smbd_smb2_session_setup_state *state =
 736                 tevent_req_data(req,
 737                 struct smbd_smb2_session_setup_state);
 738         NTSTATUS status;
 739
 740         if (tevent_req_is_nterror(req, &status)) {
 741                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 742                         tevent_req_received(req);
 743                         return nt_status_squash(status);
 744                 }
 745         } else {
 746                 status = NT_STATUS_OK;
 747         }
 748
 749         *out_session_flags = state->out_session_flags;
 750         *out_security_buffer = state->out_security_buffer;
 751         *out_session_id = state->out_session_id;
 752
 753         talloc_steal(mem_ctx, out_security_buffer->data);
 754         tevent_req_received(req);
 755         return status;
 756 }
 757
 758 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 759                                         struct tevent_context *ev,
 760                                         struct smbd_smb2_request *smb2req);
 761 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 762 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 763
 764 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 765 {
 766         NTSTATUS status;
 767         struct tevent_req *subreq = NULL;
 768
 769         status = smbd_smb2_request_verify_sizes(req, 0x04);
 770         if (!NT_STATUS_IS_OK(status)) {
 771                 return smbd_smb2_request_error(req, status);
 772         }
 773
 774         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
 775         if (subreq == NULL) {
 776                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 777         }
 778         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
 779
 780         /*
 781          * Wait a long time before going async on this to allow
 782          * requests we're waiting on to finish. Set timeout to 10 secs.
 783          */
 784         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 785 }
 786
 787 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
 788 {
 789         struct smbd_smb2_request *smb2req =
 790                 tevent_req_callback_data(subreq,
 791                 struct smbd_smb2_request);
 792         DATA_BLOB outbody;
 793         NTSTATUS status;
 794         NTSTATUS error;
 795
 796         status = smbd_smb2_logoff_recv(subreq);
 797         TALLOC_FREE(subreq);
 798         if (!NT_STATUS_IS_OK(status)) {
 799                 error = smbd_smb2_request_error(smb2req, status);
 800                 if (!NT_STATUS_IS_OK(error)) {
 801                         smbd_server_connection_terminate(smb2req->sconn,
 802                                                         nt_errstr(error));
 803                         return;
 804                 }
 805                 return;
 806         }
 807
 808         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x04);
 809         if (outbody.data == NULL) {
 810                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 811                 if (!NT_STATUS_IS_OK(error)) {
 812                         smbd_server_connection_terminate(smb2req->sconn,
 813                                                         nt_errstr(error));
 814                         return;
 815                 }
 816                 return;
 817         }
 818
 819         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 820         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 821
 822         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 823         if (!NT_STATUS_IS_OK(error)) {
 824                 smbd_server_connection_terminate(smb2req->sconn,
 825                                                 nt_errstr(error));
 826                 return;
 827         }
 828 }
 829
 830 struct smbd_smb2_logoff_state {
 831         struct smbd_smb2_request *smb2req;
 832 };
 833
 834 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq);
 835
 836 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 837                                         struct tevent_context *ev,
 838                                         struct smbd_smb2_request *smb2req)
 839 {
 840         struct tevent_req *req;
 841         struct smbd_smb2_logoff_state *state;
 842         struct tevent_req *subreq;
 843
 844         req = tevent_req_create(mem_ctx, &state,
 845                         struct smbd_smb2_logoff_state);
 846         if (req == NULL) {
 847                 return NULL;
 848         }
 849         state->smb2req = smb2req;
 850
 851         subreq = smb2srv_session_shutdown_send(state, ev,
 852                                                smb2req->session,
 853                                                smb2req);
 854         if (tevent_req_nomem(subreq, req)) {
 855                 return tevent_req_post(req, ev);
 856         }
 857         tevent_req_set_callback(subreq, smbd_smb2_logoff_shutdown_done, req);
 858
 859         return req;
 860 }
 861
 862 static void smbd_smb2_logoff_shutdown_done(struct tevent_req *subreq)
 863 {
 864         struct tevent_req *req = tevent_req_callback_data(
 865                 subreq, struct tevent_req);
 866         struct smbd_smb2_logoff_state *state = tevent_req_data(
 867                 req, struct smbd_smb2_logoff_state);
 868         NTSTATUS status;
 869
 870         status = smb2srv_session_shutdown_recv(subreq);
 871         if (tevent_req_nterror(req, status)) {
 872                 return;
 873         }
 874         TALLOC_FREE(subreq);
 875
 876         /*
 877          * As we've been awoken, we may have changed
 878          * uid in the meantime. Ensure we're still
 879          * root (SMB2_OP_LOGOFF has .as_root = true).
 880          */
 881         change_to_root_user();
 882
 883         status = smbXsrv_session_logoff(state->smb2req->session);
 884         if (tevent_req_nterror(req, status)) {
 885                 return;
 886         }
 887
 888         /*
 889          * we may need to sign the response, so we need to keep
 890          * the session until the response is sent to the wire.
 891          */
 892         talloc_steal(state->smb2req, state->smb2req->session);
 893
 894         tevent_req_done(req);
 895 }
 896
 897 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
 898 {
 899         return tevent_req_simple_recv_ntstatus(req);
 900 }