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 ((lp_server_signing() == SMB_SIGNING_OFF) &&
 189                         (in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)) {
 190                 DEBUG(0,("SMB2 signing required and we have disabled it.\n"));
 191                 return NT_STATUS_ACCESS_DENIED;
 192         }
 193
 194         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 195             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 196                 x->global->signing_required = true;
 197         }
 198
 199         if (lp_smb_encrypt(-1) == SMB_SIGNING_REQUIRED) {
 200                 x->global->encryption_required = true;
 201         }
 202
 203         if (security_session_user_level(session_info, NULL) < SECURITY_USER) {
 204                 /* we map anonymous to guest internally */
 205                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 206                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 207                 /* force no signing */
 208                 x->global->signing_required = false;
 209                 guest = true;
 210         }
 211
 212         if (guest && x->global->encryption_required) {
 213                 DEBUG(1,("reject guest session as encryption is required\n"));
 214                 return NT_STATUS_ACCESS_DENIED;
 215         }
 216
 217         if (!(conn->smb2.server.capabilities & SMB2_CAP_ENCRYPTION)) {
 218                 if (x->global->encryption_required) {
 219                         DEBUG(1,("reject session with dialect[0x%04X] "
 220                                  "as encryption is required\n",
 221                                  conn->smb2.server.dialect));
 222                         return NT_STATUS_ACCESS_DENIED;
 223                 }
 224         }
 225
 226         if (x->global->encryption_required) {
 227                 *out_session_flags |= SMB2_SESSION_FLAG_ENCRYPT_DATA;
 228         }
 229
 230         ZERO_STRUCT(session_key);
 231         memcpy(session_key, session_info->session_key.data,
 232                MIN(session_info->session_key.length, sizeof(session_key)));
 233
 234         x->global->signing_key = data_blob_talloc(x->global,
 235                                                   session_key,
 236                                                   sizeof(session_key));
 237         if (x->global->signing_key.data == NULL) {
 238                 ZERO_STRUCT(session_key);
 239                 return NT_STATUS_NO_MEMORY;
 240         }
 241
 242         if (conn->protocol >= PROTOCOL_SMB2_24) {
 243                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCMAC");
 244                 const DATA_BLOB context = data_blob_string_const_null("SmbSign");
 245
 246                 smb2_key_derivation(session_key, sizeof(session_key),
 247                                     label.data, label.length,
 248                                     context.data, context.length,
 249                                     x->global->signing_key.data);
 250         }
 251
 252         if (conn->protocol >= PROTOCOL_SMB2_24) {
 253                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 254                 const DATA_BLOB context = data_blob_string_const_null("ServerIn ");
 255
 256                 x->global->decryption_key = data_blob_talloc(x->global,
 257                                                              session_key,
 258                                                              sizeof(session_key));
 259                 if (x->global->decryption_key.data == NULL) {
 260                         ZERO_STRUCT(session_key);
 261                         return NT_STATUS_NO_MEMORY;
 262                 }
 263
 264                 smb2_key_derivation(session_key, sizeof(session_key),
 265                                     label.data, label.length,
 266                                     context.data, context.length,
 267                                     x->global->decryption_key.data);
 268         }
 269
 270         if (conn->protocol >= PROTOCOL_SMB2_24) {
 271                 const DATA_BLOB label = data_blob_string_const_null("SMB2AESCCM");
 272                 const DATA_BLOB context = data_blob_string_const_null("ServerOut");
 273
 274                 x->global->encryption_key = data_blob_talloc(x->global,
 275                                                              session_key,
 276                                                              sizeof(session_key));
 277                 if (x->global->encryption_key.data == NULL) {
 278                         ZERO_STRUCT(session_key);
 279                         return NT_STATUS_NO_MEMORY;
 280                 }
 281
 282                 smb2_key_derivation(session_key, sizeof(session_key),
 283                                     label.data, label.length,
 284                                     context.data, context.length,
 285                                     x->global->encryption_key.data);
 286
 287                 generate_random_buffer((uint8_t *)&x->nonce_high, sizeof(x->nonce_high));
 288                 x->nonce_low = 1;
 289         }
 290
 291         x->global->application_key = data_blob_dup_talloc(x->global,
 292                                                 x->global->signing_key);
 293         if (x->global->application_key.data == NULL) {
 294                 ZERO_STRUCT(session_key);
 295                 return NT_STATUS_NO_MEMORY;
 296         }
 297
 298         if (conn->protocol >= PROTOCOL_SMB2_24) {
 299                 const DATA_BLOB label = data_blob_string_const_null("SMB2APP");
 300                 const DATA_BLOB context = data_blob_string_const_null("SmbRpc");
 301
 302                 smb2_key_derivation(session_key, sizeof(session_key),
 303                                     label.data, label.length,
 304                                     context.data, context.length,
 305                                     x->global->application_key.data);
 306         }
 307         ZERO_STRUCT(session_key);
 308
 309         x->global->channels[0].signing_key = data_blob_dup_talloc(x->global->channels,
 310                                                 x->global->signing_key);
 311         if (x->global->channels[0].signing_key.data == NULL) {
 312                 return NT_STATUS_NO_MEMORY;
 313         }
 314
 315         data_blob_clear_free(&session_info->session_key);
 316         session_info->session_key = data_blob_dup_talloc(session_info,
 317                                                 x->global->application_key);
 318         if (session_info->session_key.data == NULL) {
 319                 return NT_STATUS_NO_MEMORY;
 320         }
 321
 322         session->compat = talloc_zero(session, struct user_struct);
 323         if (session->compat == NULL) {
 324                 return NT_STATUS_NO_MEMORY;
 325         }
 326         session->compat->session = session;
 327         session->compat->homes_snum = -1;
 328         session->compat->session_info = session_info;
 329         session->compat->session_keystr = NULL;
 330         session->compat->vuid = session->global->session_wire_id;
 331         DLIST_ADD(smb2req->sconn->users, session->compat);
 332         smb2req->sconn->num_users++;
 333
 334         if (security_session_user_level(session_info, NULL) >= SECURITY_USER) {
 335                 session->compat->homes_snum =
 336                         register_homes_share(session_info->unix_info->unix_name);
 337         }
 338
 339         if (!session_claim(smb2req->sconn, session->compat)) {
 340                 DEBUG(1, ("smb2: Failed to claim session "
 341                         "for vuid=%llu\n",
 342                         (unsigned long long)session->compat->vuid));
 343                 return NT_STATUS_LOGON_FAILURE;
 344         }
 345
 346         set_current_user_info(session_info->unix_info->sanitized_username,
 347                               session_info->unix_info->unix_name,
 348                               session_info->info->domain_name);
 349
 350         reload_services(smb2req->sconn, conn_snum_used, true);
 351
 352         session->status = NT_STATUS_OK;
 353         session->global->auth_session_info = session_info;
 354         session->global->auth_session_info_seqnum += 1;
 355         session->global->channels[0].auth_session_info_seqnum =
 356                 session->global->auth_session_info_seqnum;
 357         session->global->expiration_time = gensec_expire_time(session->gensec);
 358
 359         status = smbXsrv_session_update(session);
 360         if (!NT_STATUS_IS_OK(status)) {
 361                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 362                           (unsigned long long)session->compat->vuid,
 363                           nt_errstr(status)));
 364                 return NT_STATUS_LOGON_FAILURE;
 365         }
 366
 367         /*
 368          * we attach the session to the request
 369          * so that the response can be signed
 370          */
 371         smb2req->session = session;
 372         if (!guest) {
 373                 smb2req->do_signing = true;
 374         }
 375
 376         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 377
 378         *out_session_id = session->global->session_wire_id;
 379
 380         return NT_STATUS_OK;
 381 }
 382
 383 static NTSTATUS smbd_smb2_reauth_generic_return(struct smbXsrv_session *session,
 384                                         struct smbd_smb2_request *smb2req,
 385                                         struct auth_session_info *session_info,
 386                                         uint16_t *out_session_flags,
 387                                         uint64_t *out_session_id)
 388 {
 389         NTSTATUS status;
 390         struct smbXsrv_session *x = session;
 391         struct smbXsrv_connection *conn = session->connection;
 392
 393         data_blob_clear_free(&session_info->session_key);
 394         session_info->session_key = data_blob_dup_talloc(session_info,
 395                                                 x->global->application_key);
 396         if (session_info->session_key.data == NULL) {
 397                 return NT_STATUS_NO_MEMORY;
 398         }
 399
 400         session->compat->session_info = session_info;
 401         session->compat->vuid = session->global->session_wire_id;
 402
 403         session->compat->homes_snum =
 404                         register_homes_share(session_info->unix_info->unix_name);
 405
 406         set_current_user_info(session_info->unix_info->sanitized_username,
 407                               session_info->unix_info->unix_name,
 408                               session_info->info->domain_name);
 409
 410         reload_services(smb2req->sconn, conn_snum_used, true);
 411
 412         session->status = NT_STATUS_OK;
 413         TALLOC_FREE(session->global->auth_session_info);
 414         session->global->auth_session_info = session_info;
 415         session->global->auth_session_info_seqnum += 1;
 416         session->global->channels[0].auth_session_info_seqnum =
 417                 session->global->auth_session_info_seqnum;
 418         session->global->expiration_time = gensec_expire_time(session->gensec);
 419
 420         status = smbXsrv_session_update(session);
 421         if (!NT_STATUS_IS_OK(status)) {
 422                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 423                           (unsigned long long)session->compat->vuid,
 424                           nt_errstr(status)));
 425                 return NT_STATUS_LOGON_FAILURE;
 426         }
 427
 428         conn_clear_vuid_caches(conn->sconn, session->compat->vuid);
 429
 430         *out_session_id = session->global->session_wire_id;
 431
 432         return NT_STATUS_OK;
 433 }
 434
 435 struct smbd_smb2_session_setup_state {
 436         struct tevent_context *ev;
 437         struct smbd_smb2_request *smb2req;
 438         uint64_t in_session_id;
 439         uint8_t in_flags;
 440         uint8_t in_security_mode;
 441         uint64_t in_previous_session_id;
 442         DATA_BLOB in_security_buffer;
 443         struct smbXsrv_session *session;
 444         struct auth_session_info *session_info;
 445         uint16_t out_session_flags;
 446         DATA_BLOB out_security_buffer;
 447         uint64_t out_session_id;
 448         /* The following pointer is owned by state->session. */
 449         struct smbd_smb2_session_setup_state **pp_self_ref;
 450 };
 451
 452 static int pp_self_ref_destructor(struct smbd_smb2_session_setup_state **pp_state)
 453 {
 454         (*pp_state)->session = NULL;
 455         /*
 456          * To make things clearer, ensure the pp_self_ref
 457          * pointer is nulled out. We're never going to
 458          * access this again.
 459          */
 460         (*pp_state)->pp_self_ref = NULL;
 461         return 0;
 462 }
 463
 464 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 465 {
 466         /*
 467          * if state->session is not NULL,
 468          * we remove the session on failure
 469          */
 470         TALLOC_FREE(state->session);
 471         return 0;
 472 }
 473
 474 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 475 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 476
 477 /************************************************************************
 478  We have to tag the state->session pointer with memory talloc'ed
 479  on it to ensure it gets NULL'ed out if the underlying struct smbXsrv_session
 480  is deleted by shutdown whilst this request is in flight.
 481 ************************************************************************/
 482
 483 static NTSTATUS tag_state_session_ptr(struct smbd_smb2_session_setup_state *state)
 484 {
 485         state->pp_self_ref = talloc_zero(state->session,
 486                         struct smbd_smb2_session_setup_state *);
 487         if (state->pp_self_ref == NULL) {
 488                 return NT_STATUS_NO_MEMORY;
 489         }
 490         *state->pp_self_ref = state;
 491         talloc_set_destructor(state->pp_self_ref, pp_self_ref_destructor);
 492         return NT_STATUS_OK;
 493 }
 494
 495 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 496                                         struct tevent_context *ev,
 497                                         struct smbd_smb2_request *smb2req,
 498                                         uint64_t in_session_id,
 499                                         uint8_t in_flags,
 500                                         uint8_t in_security_mode,
 501                                         uint64_t in_previous_session_id,
 502                                         DATA_BLOB in_security_buffer)
 503 {
 504         struct tevent_req *req;
 505         struct smbd_smb2_session_setup_state *state;
 506         NTSTATUS status;
 507         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 508         struct tevent_req *subreq;
 509
 510         req = tevent_req_create(mem_ctx, &state,
 511                                 struct smbd_smb2_session_setup_state);
 512         if (req == NULL) {
 513                 return NULL;
 514         }
 515         state->ev = ev;
 516         state->smb2req = smb2req;
 517         state->in_session_id = in_session_id;
 518         state->in_flags = in_flags;
 519         state->in_security_mode = in_security_mode;
 520         state->in_previous_session_id = in_previous_session_id;
 521         state->in_security_buffer = in_security_buffer;
 522
 523         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 524                 if (smb2req->sconn->conn->protocol < PROTOCOL_SMB2_22) {
 525                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 526                         return tevent_req_post(req, ev);
 527                 }
 528
 529                 /*
 530                  * We do not support multi channel.
 531                  */
 532                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 533                 return tevent_req_post(req, ev);
 534         }
 535
 536         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 537
 538         if (state->in_session_id == 0) {
 539                 /* create a new session */
 540                 status = smbXsrv_session_create(state->smb2req->sconn->conn,
 541                                                 now, &state->session);
 542                 if (tevent_req_nterror(req, status)) {
 543                         return tevent_req_post(req, ev);
 544                 }
 545         } else {
 546                 status = smb2srv_session_lookup(state->smb2req->sconn->conn,
 547                                                 state->in_session_id, now,
 548                                                 &state->session);
 549                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 550                         status = NT_STATUS_OK;
 551                 }
 552                 if (NT_STATUS_IS_OK(status)) {
 553                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 554                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 555                         TALLOC_FREE(state->session->gensec);
 556                 }
 557                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 558                         tevent_req_nterror(req, status);
 559                         return tevent_req_post(req, ev);
 560                 }
 561         }
 562
 563         status = tag_state_session_ptr(state);
 564         if (tevent_req_nterror(req, status)) {
 565                 return tevent_req_post(req, ev);
 566         }
 567
 568         if (state->session->gensec == NULL) {
 569                 status = auth_generic_prepare(state->session,
 570                                               state->session->connection->remote_address,
 571                                               &state->session->gensec);
 572                 if (tevent_req_nterror(req, status)) {
 573                         return tevent_req_post(req, ev);
 574                 }
 575
 576                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 577                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 578
 579                 status = gensec_start_mech_by_oid(state->session->gensec,
 580                                                   GENSEC_OID_SPNEGO);
 581                 if (tevent_req_nterror(req, status)) {
 582                         return tevent_req_post(req, ev);
 583                 }
 584         }
 585
 586         become_root();
 587         subreq = gensec_update_send(state, state->ev,
 588                                     state->session->gensec,
 589                                     state->in_security_buffer);
 590         unbecome_root();
 591         if (tevent_req_nomem(subreq, req)) {
 592                 return tevent_req_post(req, ev);
 593         }
 594         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 595
 596         return req;
 597 }
 598
 599 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 600 {
 601         struct tevent_req *req =
 602                 tevent_req_callback_data(subreq,
 603                 struct tevent_req);
 604         struct smbd_smb2_session_setup_state *state =
 605                 tevent_req_data(req,
 606                 struct smbd_smb2_session_setup_state);
 607         NTSTATUS status;
 608
 609         become_root();
 610         status = gensec_update_recv(subreq, state,
 611                                     &state->out_security_buffer);
 612         unbecome_root();
 613         TALLOC_FREE(subreq);
 614         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 615             !NT_STATUS_IS_OK(status)) {
 616                 tevent_req_nterror(req, status);
 617                 return;
 618         }
 619
 620         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 621                 state->out_session_id = state->session->global->session_wire_id;
 622                 /* we want to keep the session */
 623                 TALLOC_FREE(state->pp_self_ref);
 624                 tevent_req_nterror(req, status);
 625                 return;
 626         }
 627
 628         status = gensec_session_info(state->session->gensec,
 629                                      state->session->global,
 630                                      &state->session_info);
 631         if (tevent_req_nterror(req, status)) {
 632                 return;
 633         }
 634
 635         if ((state->in_previous_session_id != 0) &&
 636              (state->session->global->session_wire_id !=
 637               state->in_previous_session_id))
 638         {
 639                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 640                                                 state->session->connection,
 641                                                 state->session_info,
 642                                                 state->in_previous_session_id,
 643                                                 state->session->global->session_wire_id);
 644                 if (tevent_req_nomem(subreq, req)) {
 645                         return;
 646                 }
 647                 tevent_req_set_callback(subreq,
 648                                         smbd_smb2_session_setup_previous_done,
 649                                         req);
 650                 return;
 651         }
 652
 653         if (state->session->global->auth_session_info != NULL) {
 654                 status = smbd_smb2_reauth_generic_return(state->session,
 655                                                          state->smb2req,
 656                                                          state->session_info,
 657                                                          &state->out_session_flags,
 658                                                          &state->out_session_id);
 659                 if (tevent_req_nterror(req, status)) {
 660                         return;
 661                 }
 662                 /* we want to keep the session */
 663                 TALLOC_FREE(state->pp_self_ref);
 664                 tevent_req_done(req);
 665                 return;
 666         }
 667
 668         status = smbd_smb2_auth_generic_return(state->session,
 669                                                state->smb2req,
 670                                                state->in_security_mode,
 671                                                state->session_info,
 672                                                &state->out_session_flags,
 673                                                &state->out_session_id);
 674         if (tevent_req_nterror(req, status)) {
 675                 return;
 676         }
 677
 678         /* we want to keep the session */
 679         TALLOC_FREE(state->pp_self_ref);
 680         tevent_req_done(req);
 681         return;
 682 }
 683
 684 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 685 {
 686         struct tevent_req *req =
 687                 tevent_req_callback_data(subreq,
 688                 struct tevent_req);
 689         struct smbd_smb2_session_setup_state *state =
 690                 tevent_req_data(req,
 691                 struct smbd_smb2_session_setup_state);
 692         NTSTATUS status;
 693
 694         status = smb2srv_session_close_previous_recv(subreq);
 695         TALLOC_FREE(subreq);
 696         if (tevent_req_nterror(req, status)) {
 697                 return;
 698         }
 699
 700         if (state->session->global->auth_session_info != NULL) {
 701                 status = smbd_smb2_reauth_generic_return(state->session,
 702                                                          state->smb2req,
 703                                                          state->session_info,
 704                                                          &state->out_session_flags,
 705                                                          &state->out_session_id);
 706                 if (tevent_req_nterror(req, status)) {
 707                         return;
 708                 }
 709                 /* we want to keep the session */
 710                 TALLOC_FREE(state->pp_self_ref);
 711                 tevent_req_done(req);
 712                 return;
 713         }
 714
 715         status = smbd_smb2_auth_generic_return(state->session,
 716                                                state->smb2req,
 717                                                state->in_security_mode,
 718                                                state->session_info,
 719                                                &state->out_session_flags,
 720                                                &state->out_session_id);
 721         if (tevent_req_nterror(req, status)) {
 722                 return;
 723         }
 724
 725         /* we want to keep the session */
 726         TALLOC_FREE(state->pp_self_ref);
 727         tevent_req_done(req);
 728         return;
 729 }
 730
 731 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 732                                         uint16_t *out_session_flags,
 733                                         TALLOC_CTX *mem_ctx,
 734                                         DATA_BLOB *out_security_buffer,
 735                                         uint64_t *out_session_id)
 736 {
 737         struct smbd_smb2_session_setup_state *state =
 738                 tevent_req_data(req,
 739                 struct smbd_smb2_session_setup_state);
 740         NTSTATUS status;
 741
 742         if (tevent_req_is_nterror(req, &status)) {
 743                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 744                         tevent_req_received(req);
 745                         return nt_status_squash(status);
 746                 }
 747         } else {
 748                 status = NT_STATUS_OK;
 749         }
 750
 751         *out_session_flags = state->out_session_flags;
 752         *out_security_buffer = state->out_security_buffer;
 753         *out_session_id = state->out_session_id;
 754
 755         talloc_steal(mem_ctx, out_security_buffer->data);
 756         tevent_req_received(req);
 757         return status;
 758 }
 759
 760 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 761 {
 762         NTSTATUS status;
 763         DATA_BLOB outbody;
 764
 765         status = smbd_smb2_request_verify_sizes(req, 0x04);
 766         if (!NT_STATUS_IS_OK(status)) {
 767                 return smbd_smb2_request_error(req, status);
 768         }
 769
 770         /*
 771          * TODO: cancel all outstanding requests on the session
 772          */
 773         status = smbXsrv_session_logoff(req->session);
 774         if (!NT_STATUS_IS_OK(status)) {
 775                 DEBUG(0, ("smbd_smb2_request_process_logoff: "
 776                           "smbXsrv_session_logoff() failed: %s\n",
 777                           nt_errstr(status)));
 778                 /*
 779                  * If we hit this case, there is something completely
 780                  * wrong, so we better disconnect the transport connection.
 781                  */
 782                 return status;
 783         }
 784
 785         /*
 786          * we may need to sign the response, so we need to keep
 787          * the session until the response is sent to the wire.
 788          */
 789         talloc_steal(req, req->session);
 790
 791         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 792         if (outbody.data == NULL) {
 793                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 794         }
 795
 796         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 797         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 798
 799         return smbd_smb2_request_done(req, outbody, NULL);
 800 }