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         struct smbXsrv_connection *xconn = smb2req->xconn;
 387
 388         data_blob_clear_free(&session_info->session_key);
 389         session_info->session_key = data_blob_dup_talloc(session_info,
 390                                                 x->global->application_key);
 391         if (session_info->session_key.data == NULL) {
 392                 return NT_STATUS_NO_MEMORY;
 393         }
 394
 395         session->compat->session_info = session_info;
 396         session->compat->vuid = session->global->session_wire_id;
 397
 398         session->compat->homes_snum =
 399                         register_homes_share(session_info->unix_info->unix_name);
 400
 401         set_current_user_info(session_info->unix_info->sanitized_username,
 402                               session_info->unix_info->unix_name,
 403                               session_info->info->domain_name);
 404
 405         reload_services(smb2req->sconn, conn_snum_used, true);
 406
 407         session->status = NT_STATUS_OK;
 408         TALLOC_FREE(session->global->auth_session_info);
 409         session->global->auth_session_info = session_info;
 410         session->global->auth_session_info_seqnum += 1;
 411         session->global->channels[0].auth_session_info_seqnum =
 412                 session->global->auth_session_info_seqnum;
 413         session->global->auth_time = timeval_to_nttime(&smb2req->request_time);
 414         session->global->expiration_time = gensec_expire_time(session->gensec);
 415
 416         status = smbXsrv_session_update(session);
 417         if (!NT_STATUS_IS_OK(status)) {
 418                 DEBUG(0, ("smb2: Failed to update session for vuid=%llu - %s\n",
 419                           (unsigned long long)session->compat->vuid,
 420                           nt_errstr(status)));
 421                 return NT_STATUS_LOGON_FAILURE;
 422         }
 423
 424         conn_clear_vuid_caches(xconn->sconn, session->compat->vuid);
 425
 426         *out_session_id = session->global->session_wire_id;
 427
 428         return NT_STATUS_OK;
 429 }
 430
 431 struct smbd_smb2_session_setup_state {
 432         struct tevent_context *ev;
 433         struct smbd_smb2_request *smb2req;
 434         uint64_t in_session_id;
 435         uint8_t in_flags;
 436         uint8_t in_security_mode;
 437         uint64_t in_previous_session_id;
 438         DATA_BLOB in_security_buffer;
 439         struct smbXsrv_session *session;
 440         struct auth_session_info *session_info;
 441         uint16_t out_session_flags;
 442         DATA_BLOB out_security_buffer;
 443         uint64_t out_session_id;
 444         /* The following pointer is owned by state->session. */
 445         struct smbd_smb2_session_setup_state **pp_self_ref;
 446 };
 447
 448 static int pp_self_ref_destructor(struct smbd_smb2_session_setup_state **pp_state)
 449 {
 450         (*pp_state)->session = NULL;
 451         /*
 452          * To make things clearer, ensure the pp_self_ref
 453          * pointer is nulled out. We're never going to
 454          * access this again.
 455          */
 456         (*pp_state)->pp_self_ref = NULL;
 457         return 0;
 458 }
 459
 460 static int smbd_smb2_session_setup_state_destructor(struct smbd_smb2_session_setup_state *state)
 461 {
 462         struct smbXsrv_connection *xconn;
 463         struct smbd_smb2_request *preq;
 464
 465         /*
 466          * If state->session is not NULL,
 467          * we move the session from the session table to the request on failure
 468          * so that the error response can be correctly signed, but the session
 469          * is then really deleted when the request is done.
 470          */
 471
 472         if (state->session == NULL) {
 473                 return 0;
 474         }
 475
 476         state->session->status = NT_STATUS_USER_SESSION_DELETED;
 477         state->smb2req->session = talloc_move(state->smb2req, &state->session);
 478
 479         /*
 480          * We've made this session owned by the current request.
 481          * Ensure that any outstanding requests don't also refer
 482          * to it.
 483          */
 484         xconn = state->smb2req->xconn;
 485
 486         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 487                 if (preq == state->smb2req) {
 488                         continue;
 489                 }
 490                 if (preq->session == state->smb2req->session) {
 491                         preq->session = NULL;
 492                         /*
 493                          * If we no longer have a session we can't
 494                          * sign or encrypt replies.
 495                          */
 496                         preq->do_signing = false;
 497                         preq->do_encryption = false;
 498                 }
 499         }
 500
 501         return 0;
 502 }
 503
 504 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq);
 505 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq);
 506 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req);
 507
 508 /************************************************************************
 509  We have to tag the state->session pointer with memory talloc'ed
 510  on it to ensure it gets NULL'ed out if the underlying struct smbXsrv_session
 511  is deleted by shutdown whilst this request is in flight.
 512 ************************************************************************/
 513
 514 static NTSTATUS tag_state_session_ptr(struct smbd_smb2_session_setup_state *state)
 515 {
 516         state->pp_self_ref = talloc_zero(state->session,
 517                         struct smbd_smb2_session_setup_state *);
 518         if (state->pp_self_ref == NULL) {
 519                 return NT_STATUS_NO_MEMORY;
 520         }
 521         *state->pp_self_ref = state;
 522         talloc_set_destructor(state->pp_self_ref, pp_self_ref_destructor);
 523         return NT_STATUS_OK;
 524 }
 525
 526 static struct tevent_req *smbd_smb2_session_setup_send(TALLOC_CTX *mem_ctx,
 527                                         struct tevent_context *ev,
 528                                         struct smbd_smb2_request *smb2req,
 529                                         uint64_t in_session_id,
 530                                         uint8_t in_flags,
 531                                         uint8_t in_security_mode,
 532                                         uint64_t in_previous_session_id,
 533                                         DATA_BLOB in_security_buffer)
 534 {
 535         struct tevent_req *req;
 536         struct smbd_smb2_session_setup_state *state;
 537         NTSTATUS status;
 538         NTTIME now = timeval_to_nttime(&smb2req->request_time);
 539         struct tevent_req *subreq;
 540
 541         req = tevent_req_create(mem_ctx, &state,
 542                                 struct smbd_smb2_session_setup_state);
 543         if (req == NULL) {
 544                 return NULL;
 545         }
 546         state->ev = ev;
 547         state->smb2req = smb2req;
 548         state->in_session_id = in_session_id;
 549         state->in_flags = in_flags;
 550         state->in_security_mode = in_security_mode;
 551         state->in_previous_session_id = in_previous_session_id;
 552         state->in_security_buffer = in_security_buffer;
 553
 554         if (in_flags & SMB2_SESSION_FLAG_BINDING) {
 555                 if (smb2req->xconn->protocol < PROTOCOL_SMB2_22) {
 556                         tevent_req_nterror(req, NT_STATUS_REQUEST_NOT_ACCEPTED);
 557                         return tevent_req_post(req, ev);
 558                 }
 559
 560                 /*
 561                  * We do not support multi channel.
 562                  */
 563                 tevent_req_nterror(req, NT_STATUS_NOT_SUPPORTED);
 564                 return tevent_req_post(req, ev);
 565         }
 566
 567         talloc_set_destructor(state, smbd_smb2_session_setup_state_destructor);
 568
 569         if (state->in_session_id == 0) {
 570                 /* create a new session */
 571                 status = smbXsrv_session_create(state->smb2req->xconn,
 572                                                 now, &state->session);
 573                 if (tevent_req_nterror(req, status)) {
 574                         return tevent_req_post(req, ev);
 575                 }
 576         } else {
 577                 status = smb2srv_session_lookup(state->smb2req->xconn,
 578                                                 state->in_session_id, now,
 579                                                 &state->session);
 580                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_SESSION_EXPIRED)) {
 581                         status = NT_STATUS_OK;
 582                 }
 583                 if (NT_STATUS_IS_OK(status)) {
 584                         state->session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 585                         status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 586                         TALLOC_FREE(state->session->gensec);
 587                 }
 588                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 589                         tevent_req_nterror(req, status);
 590                         return tevent_req_post(req, ev);
 591                 }
 592         }
 593
 594         status = tag_state_session_ptr(state);
 595         if (tevent_req_nterror(req, status)) {
 596                 return tevent_req_post(req, ev);
 597         }
 598
 599         if (state->session->gensec == NULL) {
 600                 status = auth_generic_prepare(state->session,
 601                                               state->smb2req->xconn->remote_address,
 602                                               &state->session->gensec);
 603                 if (tevent_req_nterror(req, status)) {
 604                         return tevent_req_post(req, ev);
 605                 }
 606
 607                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_SESSION_KEY);
 608                 gensec_want_feature(state->session->gensec, GENSEC_FEATURE_UNIX_TOKEN);
 609
 610                 status = gensec_start_mech_by_oid(state->session->gensec,
 611                                                   GENSEC_OID_SPNEGO);
 612                 if (tevent_req_nterror(req, status)) {
 613                         return tevent_req_post(req, ev);
 614                 }
 615         }
 616
 617         become_root();
 618         subreq = gensec_update_send(state, state->ev,
 619                                     state->session->gensec,
 620                                     state->in_security_buffer);
 621         unbecome_root();
 622         if (tevent_req_nomem(subreq, req)) {
 623                 return tevent_req_post(req, ev);
 624         }
 625         tevent_req_set_callback(subreq, smbd_smb2_session_setup_gensec_done, req);
 626
 627         return req;
 628 }
 629
 630 static void smbd_smb2_session_setup_gensec_done(struct tevent_req *subreq)
 631 {
 632         struct tevent_req *req =
 633                 tevent_req_callback_data(subreq,
 634                 struct tevent_req);
 635         struct smbd_smb2_session_setup_state *state =
 636                 tevent_req_data(req,
 637                 struct smbd_smb2_session_setup_state);
 638         NTSTATUS status;
 639
 640         become_root();
 641         status = gensec_update_recv(subreq, state,
 642                                     &state->out_security_buffer);
 643         unbecome_root();
 644         TALLOC_FREE(subreq);
 645         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) &&
 646             !NT_STATUS_IS_OK(status)) {
 647                 tevent_req_nterror(req, status);
 648                 return;
 649         }
 650
 651         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 652                 state->out_session_id = state->session->global->session_wire_id;
 653                 /* we want to keep the session */
 654                 state->session = NULL;
 655                 TALLOC_FREE(state->pp_self_ref);
 656                 tevent_req_nterror(req, status);
 657                 return;
 658         }
 659
 660         status = gensec_session_info(state->session->gensec,
 661                                      state->session->global,
 662                                      &state->session_info);
 663         if (tevent_req_nterror(req, status)) {
 664                 return;
 665         }
 666
 667         if ((state->in_previous_session_id != 0) &&
 668              (state->session->global->session_wire_id !=
 669               state->in_previous_session_id))
 670         {
 671                 subreq = smb2srv_session_close_previous_send(state, state->ev,
 672                                                 state->smb2req->xconn,
 673                                                 state->session_info,
 674                                                 state->in_previous_session_id,
 675                                                 state->session->global->session_wire_id);
 676                 if (tevent_req_nomem(subreq, req)) {
 677                         return;
 678                 }
 679                 tevent_req_set_callback(subreq,
 680                                         smbd_smb2_session_setup_previous_done,
 681                                         req);
 682                 return;
 683         }
 684
 685         smbd_smb2_session_setup_auth_return(req);
 686 }
 687
 688 static void smbd_smb2_session_setup_previous_done(struct tevent_req *subreq)
 689 {
 690         struct tevent_req *req =
 691                 tevent_req_callback_data(subreq,
 692                 struct tevent_req);
 693         NTSTATUS status;
 694
 695         status = smb2srv_session_close_previous_recv(subreq);
 696         TALLOC_FREE(subreq);
 697         if (tevent_req_nterror(req, status)) {
 698                 return;
 699         }
 700
 701         smbd_smb2_session_setup_auth_return(req);
 702 }
 703
 704 static void smbd_smb2_session_setup_auth_return(struct tevent_req *req)
 705 {
 706         struct smbd_smb2_session_setup_state *state =
 707                 tevent_req_data(req,
 708                 struct smbd_smb2_session_setup_state);
 709         NTSTATUS status;
 710
 711         if (state->session->global->auth_session_info != NULL) {
 712                 status = smbd_smb2_reauth_generic_return(state->session,
 713                                                          state->smb2req,
 714                                                          state->session_info,
 715                                                          &state->out_session_flags,
 716                                                          &state->out_session_id);
 717                 if (tevent_req_nterror(req, status)) {
 718                         return;
 719                 }
 720                 /* we want to keep the session */
 721                 state->session = NULL;
 722                 TALLOC_FREE(state->pp_self_ref);
 723                 tevent_req_done(req);
 724                 return;
 725         }
 726
 727         status = smbd_smb2_auth_generic_return(state->session,
 728                                                state->smb2req,
 729                                                state->in_security_mode,
 730                                                state->session_info,
 731                                                &state->out_session_flags,
 732                                                &state->out_session_id);
 733         if (tevent_req_nterror(req, status)) {
 734                 return;
 735         }
 736
 737         /* we want to keep the session */
 738         state->session = NULL;
 739         TALLOC_FREE(state->pp_self_ref);
 740         tevent_req_done(req);
 741         return;
 742 }
 743
 744 static NTSTATUS smbd_smb2_session_setup_recv(struct tevent_req *req,
 745                                         uint16_t *out_session_flags,
 746                                         TALLOC_CTX *mem_ctx,
 747                                         DATA_BLOB *out_security_buffer,
 748                                         uint64_t *out_session_id)
 749 {
 750         struct smbd_smb2_session_setup_state *state =
 751                 tevent_req_data(req,
 752                 struct smbd_smb2_session_setup_state);
 753         NTSTATUS status;
 754
 755         if (tevent_req_is_nterror(req, &status)) {
 756                 if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 757                         tevent_req_received(req);
 758                         return nt_status_squash(status);
 759                 }
 760         } else {
 761                 status = NT_STATUS_OK;
 762         }
 763
 764         *out_session_flags = state->out_session_flags;
 765         *out_security_buffer = state->out_security_buffer;
 766         *out_session_id = state->out_session_id;
 767
 768         talloc_steal(mem_ctx, out_security_buffer->data);
 769         tevent_req_received(req);
 770         return status;
 771 }
 772
 773 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 774                                         struct tevent_context *ev,
 775                                         struct smbd_smb2_request *smb2req);
 776 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req);
 777 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq);
 778
 779 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 780 {
 781         NTSTATUS status;
 782         struct tevent_req *subreq = NULL;
 783
 784         status = smbd_smb2_request_verify_sizes(req, 0x04);
 785         if (!NT_STATUS_IS_OK(status)) {
 786                 return smbd_smb2_request_error(req, status);
 787         }
 788
 789         subreq = smbd_smb2_logoff_send(req, req->sconn->ev_ctx, req);
 790         if (subreq == NULL) {
 791                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 792         }
 793         tevent_req_set_callback(subreq, smbd_smb2_request_logoff_done, req);
 794
 795         /*
 796          * Wait a long time before going async on this to allow
 797          * requests we're waiting on to finish. Set timeout to 10 secs.
 798          */
 799         return smbd_smb2_request_pending_queue(req, subreq, 10000000);
 800 }
 801
 802 static void smbd_smb2_request_logoff_done(struct tevent_req *subreq)
 803 {
 804         struct smbd_smb2_request *smb2req =
 805                 tevent_req_callback_data(subreq,
 806                 struct smbd_smb2_request);
 807         DATA_BLOB outbody;
 808         NTSTATUS status;
 809         NTSTATUS error;
 810
 811         status = smbd_smb2_logoff_recv(subreq);
 812         TALLOC_FREE(subreq);
 813         if (!NT_STATUS_IS_OK(status)) {
 814                 error = smbd_smb2_request_error(smb2req, status);
 815                 if (!NT_STATUS_IS_OK(error)) {
 816                         smbd_server_connection_terminate(smb2req->xconn,
 817                                                         nt_errstr(error));
 818                         return;
 819                 }
 820                 return;
 821         }
 822
 823         outbody = smbd_smb2_generate_outbody(smb2req, 0x04);
 824         if (outbody.data == NULL) {
 825                 error = smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 826                 if (!NT_STATUS_IS_OK(error)) {
 827                         smbd_server_connection_terminate(smb2req->xconn,
 828                                                         nt_errstr(error));
 829                         return;
 830                 }
 831                 return;
 832         }
 833
 834         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 835         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 836
 837         error = smbd_smb2_request_done(smb2req, outbody, NULL);
 838         if (!NT_STATUS_IS_OK(error)) {
 839                 smbd_server_connection_terminate(smb2req->xconn,
 840                                                 nt_errstr(error));
 841                 return;
 842         }
 843 }
 844
 845 struct smbd_smb2_logout_state {
 846         struct smbd_smb2_request *smb2req;
 847         struct tevent_queue *wait_queue;
 848 };
 849
 850 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq);
 851
 852 static struct tevent_req *smbd_smb2_logoff_send(TALLOC_CTX *mem_ctx,
 853                                         struct tevent_context *ev,
 854                                         struct smbd_smb2_request *smb2req)
 855 {
 856         struct tevent_req *req;
 857         struct smbd_smb2_logout_state *state;
 858         struct tevent_req *subreq;
 859         struct smbd_smb2_request *preq;
 860         struct smbXsrv_connection *xconn = smb2req->xconn;
 861
 862         req = tevent_req_create(mem_ctx, &state,
 863                         struct smbd_smb2_logout_state);
 864         if (req == NULL) {
 865                 return NULL;
 866         }
 867         state->smb2req = smb2req;
 868
 869         state->wait_queue = tevent_queue_create(state, "logoff_wait_queue");
 870         if (tevent_req_nomem(state->wait_queue, req)) {
 871                 return tevent_req_post(req, ev);
 872         }
 873
 874         /*
 875          * Make sure that no new request will be able to use this session.
 876          */
 877         smb2req->session->status = NT_STATUS_USER_SESSION_DELETED;
 878
 879         for (preq = xconn->smb2.requests; preq != NULL; preq = preq->next) {
 880                 if (preq == smb2req) {
 881                         /* Can't cancel current request. */
 882                         continue;
 883                 }
 884                 if (preq->session != smb2req->session) {
 885                         /* Request on different session. */
 886                         continue;
 887                 }
 888
 889                 /*
 890                  * Never cancel anything in a compound
 891                  * request. Way too hard to deal with
 892                  * the result.
 893                  */
 894                 if (!preq->compound_related && preq->subreq != NULL) {
 895                         tevent_req_cancel(preq->subreq);
 896                 }
 897
 898                 /*
 899                  * Now wait until the request is finished.
 900                  *
 901                  * We don't set a callback, as we just want to block the
 902                  * wait queue and the talloc_free() of the request will
 903                  * remove the item from the wait queue.
 904                  */
 905                 subreq = tevent_queue_wait_send(preq, ev, state->wait_queue);
 906                 if (tevent_req_nomem(subreq, req)) {
 907                         return tevent_req_post(req, ev);
 908                 }
 909         }
 910
 911         /*
 912          * Now we add our own waiter to the end of the queue,
 913          * this way we get notified when all pending requests are finished
 914          * and send to the socket.
 915          */
 916         subreq = tevent_queue_wait_send(state, ev, state->wait_queue);
 917         if (tevent_req_nomem(subreq, req)) {
 918                 return tevent_req_post(req, ev);
 919         }
 920         tevent_req_set_callback(subreq, smbd_smb2_logoff_wait_done, req);
 921
 922         return req;
 923 }
 924
 925 static void smbd_smb2_logoff_wait_done(struct tevent_req *subreq)
 926 {
 927         struct tevent_req *req = tevent_req_callback_data(
 928                 subreq, struct tevent_req);
 929         struct smbd_smb2_logout_state *state = tevent_req_data(
 930                 req, struct smbd_smb2_logout_state);
 931         NTSTATUS status;
 932
 933         tevent_queue_wait_recv(subreq);
 934         TALLOC_FREE(subreq);
 935
 936         /*
 937          * As we've been awoken, we may have changed
 938          * uid in the meantime. Ensure we're still
 939          * root (SMB2_OP_LOGOFF has .as_root = true).
 940          */
 941         change_to_root_user();
 942
 943         status = smbXsrv_session_logoff(state->smb2req->session);
 944         if (tevent_req_nterror(req, status)) {
 945                 return;
 946         }
 947
 948         /*
 949          * we may need to sign the response, so we need to keep
 950          * the session until the response is sent to the wire.
 951          */
 952         talloc_steal(state->smb2req, state->smb2req->session);
 953
 954         tevent_req_done(req);
 955 }
 956
 957 static NTSTATUS smbd_smb2_logoff_recv(struct tevent_req *req)
 958 {
 959         return tevent_req_simple_recv_ntstatus(req);
 960 }