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 "../libcli/auth/spnego.h"
  27 #include "../auth/gensec/gensec.h"
  28 #include "../auth/ntlmssp/ntlmssp.h"
  29 #include "ntlmssp_wrap.h"
  30 #include "../librpc/gen_ndr/krb5pac.h"
  31 #include "libads/kerberos_proto.h"
  32 #include "../lib/util/asn1.h"
  33 #include "auth.h"
  34 #include "../lib/tsocket/tsocket.h"
  35 #include "../libcli/security/security.h"
  36
  37 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
  38                                         uint64_t in_session_id,
  39                                         uint8_t in_security_mode,
  40                                         DATA_BLOB in_security_buffer,
  41                                         uint16_t *out_session_flags,
  42                                         DATA_BLOB *out_security_buffer,
  43                                         uint64_t *out_session_id);
  44
  45 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  46 {
  47         const uint8_t *inhdr;
  48         const uint8_t *inbody;
  49         int i = smb2req->current_idx;
  50         uint8_t *outhdr;
  51         DATA_BLOB outbody;
  52         DATA_BLOB outdyn;
  53         uint64_t in_session_id;
  54         uint8_t in_security_mode;
  55         uint16_t in_security_offset;
  56         uint16_t in_security_length;
  57         DATA_BLOB in_security_buffer;
  58         uint16_t out_session_flags;
  59         uint64_t out_session_id;
  60         uint16_t out_security_offset;
  61         DATA_BLOB out_security_buffer = data_blob_null;
  62         NTSTATUS status;
  63
  64         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  65         if (!NT_STATUS_IS_OK(status)) {
  66                 return smbd_smb2_request_error(smb2req, status);
  67         }
  68         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  69         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  70
  71         in_security_offset = SVAL(inbody, 0x0C);
  72         in_security_length = SVAL(inbody, 0x0E);
  73
  74         if (in_security_offset != (SMB2_HDR_BODY + smb2req->in.vector[i+1].iov_len)) {
  75                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  76         }
  77
  78         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  79                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  80         }
  81
  82         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  83         in_security_mode = CVAL(inbody, 0x03);
  84         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  85         in_security_buffer.length = in_security_length;
  86
  87         status = smbd_smb2_session_setup(smb2req,
  88                                          in_session_id,
  89                                          in_security_mode,
  90                                          in_security_buffer,
  91                                          &out_session_flags,
  92                                          &out_security_buffer,
  93                                          &out_session_id);
  94         if (!NT_STATUS_IS_OK(status) &&
  95             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  96                 status = nt_status_squash(status);
  97                 return smbd_smb2_request_error(smb2req, status);
  98         }
  99
 100         out_security_offset = SMB2_HDR_BODY + 0x08;
 101
 102         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 103
 104         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 105         if (outbody.data == NULL) {
 106                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 107         }
 108
 109         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 110
 111         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 112         SSVAL(outbody.data, 0x02,
 113               out_session_flags);               /* session flags */
 114         SSVAL(outbody.data, 0x04,
 115               out_security_offset);             /* security buffer offset */
 116         SSVAL(outbody.data, 0x06,
 117               out_security_buffer.length);      /* security buffer length */
 118
 119         outdyn = out_security_buffer;
 120
 121         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 122                                          __location__);
 123 }
 124
 125 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 126 {
 127         if (session->sconn == NULL) {
 128                 return 0;
 129         }
 130
 131         /* first free all tcons */
 132         while (session->tcons.list) {
 133                 talloc_free(session->tcons.list);
 134         }
 135
 136         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 137         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 138         invalidate_vuid(session->sconn, session->vuid);
 139
 140         session->vuid = 0;
 141         session->status = NT_STATUS_USER_SESSION_DELETED;
 142         session->sconn = NULL;
 143
 144         return 0;
 145 }
 146
 147 #ifdef HAVE_KRB5
 148 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 149                                         struct smbd_smb2_request *smb2req,
 150                                         uint8_t in_security_mode,
 151                                         const DATA_BLOB *secblob,
 152                                         const char *mechOID,
 153                                         uint16_t *out_session_flags,
 154                                         DATA_BLOB *out_security_buffer,
 155                                         uint64_t *out_session_id)
 156 {
 157         DATA_BLOB ap_rep = data_blob_null;
 158         DATA_BLOB ap_rep_wrapped = data_blob_null;
 159         DATA_BLOB ticket = data_blob_null;
 160         DATA_BLOB session_key = data_blob_null;
 161         DATA_BLOB secblob_out = data_blob_null;
 162         uint8 tok_id[2];
 163         struct PAC_LOGON_INFO *logon_info = NULL;
 164         char *principal = NULL;
 165         char *user = NULL;
 166         char *domain = NULL;
 167         struct passwd *pw = NULL;
 168         NTSTATUS status;
 169         char *real_username;
 170         bool username_was_mapped = false;
 171         bool map_domainuser_to_guest = false;
 172         bool guest = false;
 173
 174         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 175                 status = NT_STATUS_LOGON_FAILURE;
 176                 goto fail;
 177         }
 178
 179         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 180                                    &principal, &logon_info, &ap_rep,
 181                                    &session_key, true);
 182
 183         if (!NT_STATUS_IS_OK(status)) {
 184                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 185                         nt_errstr(status)));
 186                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 187                         status = NT_STATUS_LOGON_FAILURE;
 188                 }
 189                 goto fail;
 190         }
 191
 192         status = get_user_from_kerberos_info(talloc_tos(),
 193                                              session->sconn->remote_hostname,
 194                                              principal, logon_info,
 195                                              &username_was_mapped,
 196                                              &map_domainuser_to_guest,
 197                                              &user, &domain,
 198                                              &real_username, &pw);
 199         if (!NT_STATUS_IS_OK(status)) {
 200                 goto fail;
 201         }
 202
 203         /* save the PAC data if we have it */
 204         if (logon_info) {
 205                 netsamlogon_cache_store(user, &logon_info->info3);
 206         }
 207
 208         /* setup the string used by %U */
 209         sub_set_smb_name(real_username);
 210
 211         /* reload services so that the new %U is taken into account */
 212         reload_services(smb2req->sconn, conn_snum_used, true);
 213
 214         status = make_session_info_krb5(session,
 215                                         user, domain, real_username, pw,
 216                                         logon_info, map_domainuser_to_guest,
 217                                         username_was_mapped,
 218                                         &session_key,
 219                                         &session->session_info);
 220         if (!NT_STATUS_IS_OK(status)) {
 221                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 222                 goto fail;
 223         }
 224
 225         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 226              lp_server_signing() == SMB_SIGNING_REQUIRED) {
 227                 session->do_signing = true;
 228         }
 229
 230         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 231                 /* we map anonymous to guest internally */
 232                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 233                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 234                 /* force no signing */
 235                 session->do_signing = false;
 236                 guest = true;
 237         }
 238
 239         session->session_key = session->session_info->session_key;
 240
 241         session->compat_vuser = talloc_zero(session, user_struct);
 242         if (session->compat_vuser == NULL) {
 243                 status = NT_STATUS_NO_MEMORY;
 244                 goto fail;
 245         }
 246         session->compat_vuser->auth_ntlmssp_state = NULL;
 247         session->compat_vuser->homes_snum = -1;
 248         session->compat_vuser->session_info = session->session_info;
 249         session->compat_vuser->session_keystr = NULL;
 250         session->compat_vuser->vuid = session->vuid;
 251         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 252
 253         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 254                 session->compat_vuser->homes_snum =
 255                         register_homes_share(session->session_info->unix_info->unix_name);
 256         }
 257
 258         if (!session_claim(session->sconn, session->compat_vuser)) {
 259                 DEBUG(1, ("smb2: Failed to claim session "
 260                         "for vuid=%d\n",
 261                         session->compat_vuser->vuid));
 262                 goto fail;
 263         }
 264
 265         session->status = NT_STATUS_OK;
 266
 267         /*
 268          * we attach the session to the request
 269          * so that the response can be signed
 270          */
 271         smb2req->session = session;
 272         if (!guest) {
 273                 smb2req->do_signing = true;
 274         }
 275
 276         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 277         status = NT_STATUS_OK;
 278
 279         /* wrap that up in a nice GSS-API wrapping */
 280         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 281                                 TOK_ID_KRB_AP_REP);
 282
 283         secblob_out = spnego_gen_auth_response(
 284                                         talloc_tos(),
 285                                         &ap_rep_wrapped,
 286                                         status,
 287                                         mechOID);
 288
 289         *out_security_buffer = data_blob_talloc(smb2req,
 290                                                 secblob_out.data,
 291                                                 secblob_out.length);
 292         if (secblob_out.data && out_security_buffer->data == NULL) {
 293                 status = NT_STATUS_NO_MEMORY;
 294                 goto fail;
 295         }
 296
 297         data_blob_free(&ap_rep);
 298         data_blob_free(&ap_rep_wrapped);
 299         data_blob_free(&ticket);
 300         data_blob_free(&session_key);
 301         data_blob_free(&secblob_out);
 302
 303         *out_session_id = session->vuid;
 304
 305         return NT_STATUS_OK;
 306
 307   fail:
 308
 309         data_blob_free(&ap_rep);
 310         data_blob_free(&ap_rep_wrapped);
 311         data_blob_free(&ticket);
 312         data_blob_free(&session_key);
 313         data_blob_free(&secblob_out);
 314
 315         ap_rep_wrapped = data_blob_null;
 316         secblob_out = spnego_gen_auth_response(
 317                                         talloc_tos(),
 318                                         &ap_rep_wrapped,
 319                                         status,
 320                                         mechOID);
 321
 322         *out_security_buffer = data_blob_talloc(smb2req,
 323                                                 secblob_out.data,
 324                                                 secblob_out.length);
 325         data_blob_free(&secblob_out);
 326         return status;
 327 }
 328 #endif
 329
 330 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 331                                         struct smbd_smb2_request *smb2req,
 332                                         uint8_t in_security_mode,
 333                                         DATA_BLOB in_security_buffer,
 334                                         uint16_t *out_session_flags,
 335                                         DATA_BLOB *out_security_buffer,
 336                                         uint64_t *out_session_id)
 337 {
 338         DATA_BLOB secblob_in = data_blob_null;
 339         DATA_BLOB chal_out = data_blob_null;
 340         char *kerb_mech = NULL;
 341         NTSTATUS status;
 342
 343         /* Ensure we have no old NTLM state around. */
 344         TALLOC_FREE(session->auth_ntlmssp_state);
 345
 346         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 347                         &secblob_in, &kerb_mech);
 348         if (!NT_STATUS_IS_OK(status)) {
 349                 goto out;
 350         }
 351
 352 #ifdef HAVE_KRB5
 353         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 354                                 USE_KERBEROS_KEYTAB) ) {
 355                 status = smbd_smb2_session_setup_krb5(session,
 356                                 smb2req,
 357                                 in_security_mode,
 358                                 &secblob_in,
 359                                 kerb_mech,
 360                                 out_session_flags,
 361                                 out_security_buffer,
 362                                 out_session_id);
 363
 364                 goto out;
 365         }
 366 #endif
 367
 368         if (kerb_mech) {
 369                 /* The mechtoken is a krb5 ticket, but
 370                  * we need to fall back to NTLM. */
 371
 372                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 373                         "but set to downgrade to NTLMSSP\n"));
 374
 375                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 376         } else {
 377                 /* Fall back to NTLMSSP. */
 378                 status = auth_generic_prepare(session, session->sconn->remote_address,
 379                                             &session->auth_ntlmssp_state);
 380                 if (!NT_STATUS_IS_OK(status)) {
 381                         goto out;
 382                 }
 383
 384                 gensec_want_feature(session->auth_ntlmssp_state->gensec_security, GENSEC_FEATURE_SESSION_KEY);
 385
 386                 status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_NTLMSSP);
 387                 if (!NT_STATUS_IS_OK(status)) {
 388                         goto out;
 389                 }
 390
 391                 status = gensec_update(session->auth_ntlmssp_state->gensec_security,
 392                                        talloc_tos(), NULL,
 393                                        secblob_in,
 394                                        &chal_out);
 395         }
 396
 397         if (!NT_STATUS_IS_OK(status) &&
 398                         !NT_STATUS_EQUAL(status,
 399                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 400                 goto out;
 401         }
 402
 403         *out_security_buffer = spnego_gen_auth_response(smb2req,
 404                                                 &chal_out,
 405                                                 status,
 406                                                 OID_NTLMSSP);
 407         if (out_security_buffer->data == NULL) {
 408                 status = NT_STATUS_NO_MEMORY;
 409                 goto out;
 410         }
 411         *out_session_id = session->vuid;
 412
 413   out:
 414
 415         data_blob_free(&secblob_in);
 416         data_blob_free(&chal_out);
 417         TALLOC_FREE(kerb_mech);
 418         if (!NT_STATUS_IS_OK(status) &&
 419                         !NT_STATUS_EQUAL(status,
 420                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 421                 TALLOC_FREE(session);
 422         }
 423         return status;
 424 }
 425
 426 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 427                                         struct smbd_smb2_request *smb2req,
 428                                         uint8_t in_security_mode,
 429                                         DATA_BLOB in_security_buffer,
 430                                         uint16_t *out_session_flags,
 431                                         uint64_t *out_session_id)
 432 {
 433         bool guest = false;
 434
 435         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 436             lp_server_signing() == SMB_SIGNING_REQUIRED) {
 437                 session->do_signing = true;
 438         }
 439
 440         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 441                 /* we map anonymous to guest internally */
 442                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 443                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 444                 /* force no signing */
 445                 session->do_signing = false;
 446                 guest = true;
 447         }
 448
 449         session->session_key = session->session_info->session_key;
 450
 451         session->compat_vuser = talloc_zero(session, user_struct);
 452         if (session->compat_vuser == NULL) {
 453                 TALLOC_FREE(session);
 454                 return NT_STATUS_NO_MEMORY;
 455         }
 456         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 457         session->compat_vuser->homes_snum = -1;
 458         session->compat_vuser->session_info = session->session_info;
 459         session->compat_vuser->session_keystr = NULL;
 460         session->compat_vuser->vuid = session->vuid;
 461         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 462
 463         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 464                 session->compat_vuser->homes_snum =
 465                         register_homes_share(session->session_info->unix_info->unix_name);
 466         }
 467
 468         if (!session_claim(session->sconn, session->compat_vuser)) {
 469                 DEBUG(1, ("smb2: Failed to claim session "
 470                         "for vuid=%d\n",
 471                         session->compat_vuser->vuid));
 472                 TALLOC_FREE(session);
 473                 return NT_STATUS_LOGON_FAILURE;
 474         }
 475
 476
 477         session->status = NT_STATUS_OK;
 478
 479         /*
 480          * we attach the session to the request
 481          * so that the response can be signed
 482          */
 483         smb2req->session = session;
 484         if (!guest) {
 485                 smb2req->do_signing = true;
 486         }
 487
 488         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 489
 490         *out_session_id = session->vuid;
 491
 492         return NT_STATUS_OK;
 493 }
 494
 495 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 496                                         struct smbd_smb2_request *smb2req,
 497                                         uint8_t in_security_mode,
 498                                         DATA_BLOB in_security_buffer,
 499                                         uint16_t *out_session_flags,
 500                                         DATA_BLOB *out_security_buffer,
 501                                         uint64_t *out_session_id)
 502 {
 503         DATA_BLOB auth = data_blob_null;
 504         DATA_BLOB auth_out = data_blob_null;
 505         NTSTATUS status;
 506
 507         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 508                 TALLOC_FREE(session);
 509                 return NT_STATUS_LOGON_FAILURE;
 510         }
 511
 512         if (auth.data[0] == ASN1_APPLICATION(0)) {
 513                 /* Might be a second negTokenTarg packet */
 514                 DATA_BLOB secblob_in = data_blob_null;
 515                 char *kerb_mech = NULL;
 516
 517                 status = parse_spnego_mechanisms(talloc_tos(),
 518                                 in_security_buffer,
 519                                 &secblob_in, &kerb_mech);
 520                 if (!NT_STATUS_IS_OK(status)) {
 521                         TALLOC_FREE(session);
 522                         return status;
 523                 }
 524
 525 #ifdef HAVE_KRB5
 526                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 527                                         USE_KERBEROS_KEYTAB) ) {
 528                         status = smbd_smb2_session_setup_krb5(session,
 529                                         smb2req,
 530                                         in_security_mode,
 531                                         &secblob_in,
 532                                         kerb_mech,
 533                                         out_session_flags,
 534                                         out_security_buffer,
 535                                         out_session_id);
 536
 537                         data_blob_free(&secblob_in);
 538                         TALLOC_FREE(kerb_mech);
 539                         if (!NT_STATUS_IS_OK(status)) {
 540                                 TALLOC_FREE(session);
 541                         }
 542                         return status;
 543                 }
 544 #endif
 545
 546                 /* Can't blunder into NTLMSSP auth if we have
 547                  * a krb5 ticket. */
 548
 549                 if (kerb_mech) {
 550                         DEBUG(3,("smb2: network "
 551                                 "misconfiguration, client sent us a "
 552                                 "krb5 ticket and kerberos security "
 553                                 "not enabled\n"));
 554                         TALLOC_FREE(session);
 555                         data_blob_free(&secblob_in);
 556                         TALLOC_FREE(kerb_mech);
 557                         return NT_STATUS_LOGON_FAILURE;
 558                 }
 559
 560                 data_blob_free(&secblob_in);
 561         }
 562
 563         if (session->auth_ntlmssp_state == NULL) {
 564                 status = auth_generic_prepare(session, session->sconn->remote_address,
 565                                             &session->auth_ntlmssp_state);
 566                 if (!NT_STATUS_IS_OK(status)) {
 567                         data_blob_free(&auth);
 568                         TALLOC_FREE(session);
 569                         return status;
 570                 }
 571
 572                 gensec_want_feature(session->auth_ntlmssp_state->gensec_security, GENSEC_FEATURE_SESSION_KEY);
 573
 574                 status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_NTLMSSP);
 575                 if (!NT_STATUS_IS_OK(status)) {
 576                         data_blob_free(&auth);
 577                         TALLOC_FREE(session);
 578                         return status;
 579                 }
 580         }
 581
 582         status = gensec_update(session->auth_ntlmssp_state->gensec_security,
 583                                talloc_tos(), NULL,
 584                                auth,
 585                                &auth_out);
 586         /* If status is NT_STATUS_OK then we need to get the token.
 587          * Map to guest is now internal to auth_ntlmssp */
 588         if (NT_STATUS_IS_OK(status)) {
 589                 status = gensec_session_info(session->auth_ntlmssp_state->gensec_security,
 590                                              session,
 591                                              &session->session_info);
 592         }
 593
 594         if (!NT_STATUS_IS_OK(status) &&
 595                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 596                 data_blob_free(&auth);
 597                 TALLOC_FREE(session);
 598                 return status;
 599         }
 600
 601         data_blob_free(&auth);
 602
 603         *out_security_buffer = spnego_gen_auth_response(smb2req,
 604                                 &auth_out, status, NULL);
 605
 606         if (out_security_buffer->data == NULL) {
 607                 TALLOC_FREE(session);
 608                 return NT_STATUS_NO_MEMORY;
 609         }
 610
 611         *out_session_id = session->vuid;
 612
 613         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 614                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 615         }
 616
 617         /* We're done - claim the session. */
 618         return smbd_smb2_common_ntlmssp_auth_return(session,
 619                                                 smb2req,
 620                                                 in_security_mode,
 621                                                 in_security_buffer,
 622                                                 out_session_flags,
 623                                                 out_session_id);
 624 }
 625
 626 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 627                                         struct smbd_smb2_request *smb2req,
 628                                         uint8_t in_security_mode,
 629                                         DATA_BLOB in_security_buffer,
 630                                         uint16_t *out_session_flags,
 631                                         DATA_BLOB *out_security_buffer,
 632                                         uint64_t *out_session_id)
 633 {
 634         NTSTATUS status;
 635
 636         *out_security_buffer = data_blob_null;
 637
 638         if (session->auth_ntlmssp_state == NULL) {
 639                 status = auth_generic_prepare(session, session->sconn->remote_address,
 640                                             &session->auth_ntlmssp_state);
 641                 if (!NT_STATUS_IS_OK(status)) {
 642                         TALLOC_FREE(session);
 643                         return status;
 644                 }
 645
 646                 gensec_want_feature(session->auth_ntlmssp_state->gensec_security, GENSEC_FEATURE_SESSION_KEY);
 647
 648                 if (session->sconn->use_gensec_hook) {
 649                         status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_SPNEGO);
 650                 } else {
 651                         status = auth_generic_start(session->auth_ntlmssp_state, GENSEC_OID_NTLMSSP);
 652                 }
 653                 if (!NT_STATUS_IS_OK(status)) {
 654                         TALLOC_FREE(session);
 655                         return status;
 656                 }
 657         }
 658
 659         /* RAW NTLMSSP */
 660         status = gensec_update(session->auth_ntlmssp_state->gensec_security,
 661                                smb2req, NULL,
 662                                in_security_buffer,
 663                                out_security_buffer);
 664
 665         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 666                 *out_session_id = session->vuid;
 667                 return status;
 668         }
 669
 670         status = gensec_session_info(session->auth_ntlmssp_state->gensec_security,
 671                                      session,
 672                                      &session->session_info);
 673
 674         if (!NT_STATUS_IS_OK(status)) {
 675                 TALLOC_FREE(session);
 676                 return status;
 677         }
 678         *out_session_id = session->vuid;
 679
 680         return smbd_smb2_common_ntlmssp_auth_return(session,
 681                                                 smb2req,
 682                                                 in_security_mode,
 683                                                 in_security_buffer,
 684                                                 out_session_flags,
 685                                                 out_session_id);
 686 }
 687
 688 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 689                                         uint64_t in_session_id,
 690                                         uint8_t in_security_mode,
 691                                         DATA_BLOB in_security_buffer,
 692                                         uint16_t *out_session_flags,
 693                                         DATA_BLOB *out_security_buffer,
 694                                         uint64_t *out_session_id)
 695 {
 696         struct smbd_smb2_session *session;
 697
 698         *out_session_flags = 0;
 699         *out_session_id = 0;
 700
 701         if (in_session_id == 0) {
 702                 int id;
 703
 704                 /* create a new session */
 705                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 706                 if (session == NULL) {
 707                         return NT_STATUS_NO_MEMORY;
 708                 }
 709                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 710                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 711                                         session,
 712                                         smb2req->sconn->smb2.sessions.limit);
 713                 if (id == -1) {
 714                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 715                 }
 716                 session->vuid = id;
 717
 718                 session->tcons.idtree = idr_init(session);
 719                 if (session->tcons.idtree == NULL) {
 720                         return NT_STATUS_NO_MEMORY;
 721                 }
 722                 session->tcons.limit = 0x0000FFFE;
 723                 session->tcons.list = NULL;
 724
 725                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 726                               struct smbd_smb2_session *);
 727                 session->sconn = smb2req->sconn;
 728                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 729         } else {
 730                 void *p;
 731
 732                 /* lookup an existing session */
 733                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 734                 if (p == NULL) {
 735                         return NT_STATUS_USER_SESSION_DELETED;
 736                 }
 737                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 738         }
 739
 740         if (NT_STATUS_IS_OK(session->status)) {
 741                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 742         }
 743
 744         /* Handle either raw NTLMSSP or hand off the whole blob to
 745          * GENSEC.  The processing at this layer is essentially
 746          * identical regardless.  In particular, both rely only on the
 747          * status code (not the contents of the packet) and do not
 748          * wrap the result */
 749         if (session->sconn->use_gensec_hook
 750             || ntlmssp_blob_matches_magic(&in_security_buffer)) {
 751                 return smbd_smb2_raw_ntlmssp_auth(session,
 752                                                 smb2req,
 753                                                 in_security_mode,
 754                                                 in_security_buffer,
 755                                                 out_session_flags,
 756                                                 out_security_buffer,
 757                                                 out_session_id);
 758         } else if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 759                 return smbd_smb2_spnego_negotiate(session,
 760                                                 smb2req,
 761                                                 in_security_mode,
 762                                                 in_security_buffer,
 763                                                 out_session_flags,
 764                                                 out_security_buffer,
 765                                                 out_session_id);
 766         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 767                 return smbd_smb2_spnego_auth(session,
 768                                                 smb2req,
 769                                                 in_security_mode,
 770                                                 in_security_buffer,
 771                                                 out_session_flags,
 772                                                 out_security_buffer,
 773                                                 out_session_id);
 774         }
 775
 776         /* Unknown packet type. */
 777         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 778                 (unsigned int)in_security_buffer.data[0] ));
 779         TALLOC_FREE(session);
 780         return NT_STATUS_LOGON_FAILURE;
 781 }
 782
 783 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 784 {
 785         NTSTATUS status;
 786         DATA_BLOB outbody;
 787
 788         status = smbd_smb2_request_verify_sizes(req, 0x04);
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 return smbd_smb2_request_error(req, status);
 791         }
 792
 793         /*
 794          * TODO: cancel all outstanding requests on the session
 795          *       and delete all tree connections.
 796          */
 797         smbd_smb2_session_destructor(req->session);
 798         /*
 799          * we may need to sign the response, so we need to keep
 800          * the session until the response is sent to the wire.
 801          */
 802         talloc_steal(req, req->session);
 803
 804         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 805         if (outbody.data == NULL) {
 806                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 807         }
 808
 809         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 810         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 811
 812         return smbd_smb2_request_done(req, outbody, NULL);
 813 }