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 "../libcli/auth/ntlmssp.h"
  28 #include "ntlmssp_wrap.h"
  29 #include "../librpc/gen_ndr/krb5pac.h"
  30 #include "libads/kerberos_proto.h"
  31 #include "../lib/util/asn1.h"
  32 #include "auth.h"
  33 #include "../lib/tsocket/tsocket.h"
  34 #include "../libcli/security/security.h"
  35
  36 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
  37                                         uint64_t in_session_id,
  38                                         uint8_t in_security_mode,
  39                                         DATA_BLOB in_security_buffer,
  40                                         uint16_t *out_session_flags,
  41                                         DATA_BLOB *out_security_buffer,
  42                                         uint64_t *out_session_id);
  43
  44 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  45 {
  46         const uint8_t *inhdr;
  47         const uint8_t *inbody;
  48         int i = smb2req->current_idx;
  49         uint8_t *outhdr;
  50         DATA_BLOB outbody;
  51         DATA_BLOB outdyn;
  52         size_t expected_body_size = 0x19;
  53         size_t body_size;
  54         uint64_t in_session_id;
  55         uint8_t in_security_mode;
  56         uint16_t in_security_offset;
  57         uint16_t in_security_length;
  58         DATA_BLOB in_security_buffer;
  59         uint16_t out_session_flags;
  60         uint64_t out_session_id;
  61         uint16_t out_security_offset;
  62         DATA_BLOB out_security_buffer;
  63         NTSTATUS status;
  64
  65         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  66
  67         if (smb2req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  68                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  69         }
  70
  71         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  72
  73         body_size = SVAL(inbody, 0x00);
  74         if (body_size != expected_body_size) {
  75                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  76         }
  77
  78         in_security_offset = SVAL(inbody, 0x0C);
  79         in_security_length = SVAL(inbody, 0x0E);
  80
  81         if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  82                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  83         }
  84
  85         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  86                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  87         }
  88
  89         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  90         in_security_mode = CVAL(inbody, 0x03);
  91         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  92         in_security_buffer.length = in_security_length;
  93
  94         status = smbd_smb2_session_setup(smb2req,
  95                                          in_session_id,
  96                                          in_security_mode,
  97                                          in_security_buffer,
  98                                          &out_session_flags,
  99                                          &out_security_buffer,
 100                                          &out_session_id);
 101         if (!NT_STATUS_IS_OK(status) &&
 102             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 103                 status = nt_status_squash(status);
 104                 return smbd_smb2_request_error(smb2req, status);
 105         }
 106
 107         out_security_offset = SMB2_HDR_BODY + 0x08;
 108
 109         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 110
 111         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 112         if (outbody.data == NULL) {
 113                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 114         }
 115
 116         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 117
 118         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 119         SSVAL(outbody.data, 0x02,
 120               out_session_flags);               /* session flags */
 121         SSVAL(outbody.data, 0x04,
 122               out_security_offset);             /* security buffer offset */
 123         SSVAL(outbody.data, 0x06,
 124               out_security_buffer.length);      /* security buffer length */
 125
 126         outdyn = out_security_buffer;
 127
 128         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 129                                          __location__);
 130 }
 131
 132 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 133 {
 134         if (session->sconn == NULL) {
 135                 return 0;
 136         }
 137
 138         /* first free all tcons */
 139         while (session->tcons.list) {
 140                 talloc_free(session->tcons.list);
 141         }
 142
 143         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 144         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 145         invalidate_vuid(session->sconn, session->vuid);
 146
 147         session->vuid = 0;
 148         session->status = NT_STATUS_USER_SESSION_DELETED;
 149         session->sconn = NULL;
 150
 151         return 0;
 152 }
 153
 154 #ifdef HAVE_KRB5
 155 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 156                                         struct smbd_smb2_request *smb2req,
 157                                         uint8_t in_security_mode,
 158                                         const DATA_BLOB *secblob,
 159                                         const char *mechOID,
 160                                         uint16_t *out_session_flags,
 161                                         DATA_BLOB *out_security_buffer,
 162                                         uint64_t *out_session_id)
 163 {
 164         DATA_BLOB ap_rep = data_blob_null;
 165         DATA_BLOB ap_rep_wrapped = data_blob_null;
 166         DATA_BLOB ticket = data_blob_null;
 167         DATA_BLOB session_key = data_blob_null;
 168         DATA_BLOB secblob_out = data_blob_null;
 169         uint8 tok_id[2];
 170         struct PAC_LOGON_INFO *logon_info = NULL;
 171         char *principal = NULL;
 172         char *user = NULL;
 173         char *domain = NULL;
 174         struct passwd *pw = NULL;
 175         NTSTATUS status;
 176         char *real_username;
 177         bool username_was_mapped = false;
 178         bool map_domainuser_to_guest = false;
 179
 180         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 181                 status = NT_STATUS_LOGON_FAILURE;
 182                 goto fail;
 183         }
 184
 185         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 186                                    &principal, &logon_info, &ap_rep,
 187                                    &session_key, true);
 188
 189         if (!NT_STATUS_IS_OK(status)) {
 190                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 191                         nt_errstr(status)));
 192                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 193                         status = NT_STATUS_LOGON_FAILURE;
 194                 }
 195                 goto fail;
 196         }
 197
 198         status = get_user_from_kerberos_info(talloc_tos(),
 199                                              session->sconn->remote_hostname,
 200                                              principal, logon_info,
 201                                              &username_was_mapped,
 202                                              &map_domainuser_to_guest,
 203                                              &user, &domain,
 204                                              &real_username, &pw);
 205         if (!NT_STATUS_IS_OK(status)) {
 206                 goto fail;
 207         }
 208
 209         /* save the PAC data if we have it */
 210         if (logon_info) {
 211                 netsamlogon_cache_store(user, &logon_info->info3);
 212         }
 213
 214         /* setup the string used by %U */
 215         sub_set_smb_name(real_username);
 216
 217         /* reload services so that the new %U is taken into account */
 218         reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
 219
 220         status = make_session_info_krb5(session,
 221                                         user, domain, real_username, pw,
 222                                         logon_info, map_domainuser_to_guest,
 223                                         username_was_mapped,
 224                                         &session_key,
 225                                         &session->session_info);
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 228                 goto fail;
 229         }
 230
 231         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 232              lp_server_signing() == Required) {
 233                 session->do_signing = true;
 234         }
 235
 236         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 237                 /* we map anonymous to guest internally */
 238                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 239                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 240                 /* force no signing */
 241                 session->do_signing = false;
 242         }
 243
 244         session->session_key = session->session_info->session_key;
 245
 246         session->compat_vuser = talloc_zero(session, user_struct);
 247         if (session->compat_vuser == NULL) {
 248                 status = NT_STATUS_NO_MEMORY;
 249                 goto fail;
 250         }
 251         session->compat_vuser->auth_ntlmssp_state = NULL;
 252         session->compat_vuser->homes_snum = -1;
 253         session->compat_vuser->session_info = session->session_info;
 254         session->compat_vuser->session_keystr = NULL;
 255         session->compat_vuser->vuid = session->vuid;
 256         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 257
 258         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 259                 session->compat_vuser->homes_snum =
 260                         register_homes_share(session->session_info->unix_info->unix_name);
 261         }
 262
 263         if (!session_claim(session->sconn, session->compat_vuser)) {
 264                 DEBUG(1, ("smb2: Failed to claim session "
 265                         "for vuid=%d\n",
 266                         session->compat_vuser->vuid));
 267                 goto fail;
 268         }
 269
 270         session->status = NT_STATUS_OK;
 271
 272         /*
 273          * we attach the session to the request
 274          * so that the response can be signed
 275          */
 276         smb2req->session = session;
 277         if (session->do_signing) {
 278                 smb2req->do_signing = true;
 279         }
 280
 281         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 282         status = NT_STATUS_OK;
 283
 284         /* wrap that up in a nice GSS-API wrapping */
 285         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 286                                 TOK_ID_KRB_AP_REP);
 287
 288         secblob_out = spnego_gen_auth_response(
 289                                         talloc_tos(),
 290                                         &ap_rep_wrapped,
 291                                         status,
 292                                         mechOID);
 293
 294         *out_security_buffer = data_blob_talloc(smb2req,
 295                                                 secblob_out.data,
 296                                                 secblob_out.length);
 297         if (secblob_out.data && out_security_buffer->data == NULL) {
 298                 status = NT_STATUS_NO_MEMORY;
 299                 goto fail;
 300         }
 301
 302         data_blob_free(&ap_rep);
 303         data_blob_free(&ap_rep_wrapped);
 304         data_blob_free(&ticket);
 305         data_blob_free(&session_key);
 306         data_blob_free(&secblob_out);
 307
 308         *out_session_id = session->vuid;
 309
 310         return NT_STATUS_OK;
 311
 312   fail:
 313
 314         data_blob_free(&ap_rep);
 315         data_blob_free(&ap_rep_wrapped);
 316         data_blob_free(&ticket);
 317         data_blob_free(&session_key);
 318         data_blob_free(&secblob_out);
 319
 320         ap_rep_wrapped = data_blob_null;
 321         secblob_out = spnego_gen_auth_response(
 322                                         talloc_tos(),
 323                                         &ap_rep_wrapped,
 324                                         status,
 325                                         mechOID);
 326
 327         *out_security_buffer = data_blob_talloc(smb2req,
 328                                                 secblob_out.data,
 329                                                 secblob_out.length);
 330         data_blob_free(&secblob_out);
 331         return status;
 332 }
 333 #endif
 334
 335 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 336                                         struct smbd_smb2_request *smb2req,
 337                                         uint8_t in_security_mode,
 338                                         DATA_BLOB in_security_buffer,
 339                                         uint16_t *out_session_flags,
 340                                         DATA_BLOB *out_security_buffer,
 341                                         uint64_t *out_session_id)
 342 {
 343         DATA_BLOB secblob_in = data_blob_null;
 344         DATA_BLOB chal_out = data_blob_null;
 345         char *kerb_mech = NULL;
 346         NTSTATUS status;
 347
 348         /* Ensure we have no old NTLM state around. */
 349         TALLOC_FREE(session->auth_ntlmssp_state);
 350
 351         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 352                         &secblob_in, &kerb_mech);
 353         if (!NT_STATUS_IS_OK(status)) {
 354                 goto out;
 355         }
 356
 357 #ifdef HAVE_KRB5
 358         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 359                                 USE_KERBEROS_KEYTAB) ) {
 360                 status = smbd_smb2_session_setup_krb5(session,
 361                                 smb2req,
 362                                 in_security_mode,
 363                                 &secblob_in,
 364                                 kerb_mech,
 365                                 out_session_flags,
 366                                 out_security_buffer,
 367                                 out_session_id);
 368
 369                 goto out;
 370         }
 371 #endif
 372
 373         if (kerb_mech) {
 374                 /* The mechtoken is a krb5 ticket, but
 375                  * we need to fall back to NTLM. */
 376
 377                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 378                         "but set to downgrade to NTLMSSP\n"));
 379
 380                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 381         } else {
 382                 /* Fall back to NTLMSSP. */
 383                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 384                                             &session->auth_ntlmssp_state);
 385                 if (!NT_STATUS_IS_OK(status)) {
 386                         goto out;
 387                 }
 388
 389                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 390
 391                 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 392                 if (!NT_STATUS_IS_OK(status)) {
 393                         goto out;
 394                 }
 395
 396                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 397                                              talloc_tos(),
 398                                              secblob_in,
 399                                              &chal_out);
 400         }
 401
 402         if (!NT_STATUS_IS_OK(status) &&
 403                         !NT_STATUS_EQUAL(status,
 404                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 405                 goto out;
 406         }
 407
 408         *out_security_buffer = spnego_gen_auth_response(smb2req,
 409                                                 &chal_out,
 410                                                 status,
 411                                                 OID_NTLMSSP);
 412         if (out_security_buffer->data == NULL) {
 413                 status = NT_STATUS_NO_MEMORY;
 414                 goto out;
 415         }
 416         *out_session_id = session->vuid;
 417
 418   out:
 419
 420         data_blob_free(&secblob_in);
 421         data_blob_free(&chal_out);
 422         TALLOC_FREE(kerb_mech);
 423         if (!NT_STATUS_IS_OK(status) &&
 424                         !NT_STATUS_EQUAL(status,
 425                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 426                 TALLOC_FREE(session->auth_ntlmssp_state);
 427                 TALLOC_FREE(session);
 428         }
 429         return status;
 430 }
 431
 432 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 433                                         struct smbd_smb2_request *smb2req,
 434                                         uint8_t in_security_mode,
 435                                         DATA_BLOB in_security_buffer,
 436                                         uint16_t *out_session_flags,
 437                                         uint64_t *out_session_id)
 438 {
 439         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 440             lp_server_signing() == Required) {
 441                 session->do_signing = true;
 442         }
 443
 444         if (security_session_user_level(session->session_info, NULL) < SECURITY_USER) {
 445                 /* we map anonymous to guest internally */
 446                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 447                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 448                 /* force no signing */
 449                 session->do_signing = false;
 450         }
 451
 452         session->session_key = session->session_info->session_key;
 453
 454         session->compat_vuser = talloc_zero(session, user_struct);
 455         if (session->compat_vuser == NULL) {
 456                 TALLOC_FREE(session->auth_ntlmssp_state);
 457                 TALLOC_FREE(session);
 458                 return NT_STATUS_NO_MEMORY;
 459         }
 460         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 461         session->compat_vuser->homes_snum = -1;
 462         session->compat_vuser->session_info = session->session_info;
 463         session->compat_vuser->session_keystr = NULL;
 464         session->compat_vuser->vuid = session->vuid;
 465         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 466
 467         if (security_session_user_level(session->session_info, NULL) >= SECURITY_USER) {
 468                 session->compat_vuser->homes_snum =
 469                         register_homes_share(session->session_info->unix_info->unix_name);
 470         }
 471
 472         if (!session_claim(session->sconn, session->compat_vuser)) {
 473                 DEBUG(1, ("smb2: Failed to claim session "
 474                         "for vuid=%d\n",
 475                         session->compat_vuser->vuid));
 476                 TALLOC_FREE(session->auth_ntlmssp_state);
 477                 TALLOC_FREE(session);
 478                 return NT_STATUS_LOGON_FAILURE;
 479         }
 480
 481
 482         session->status = NT_STATUS_OK;
 483
 484         /*
 485          * we attach the session to the request
 486          * so that the response can be signed
 487          */
 488         smb2req->session = session;
 489         if (session->do_signing) {
 490                 smb2req->do_signing = true;
 491         }
 492
 493         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 494
 495         *out_session_id = session->vuid;
 496
 497         return NT_STATUS_OK;
 498 }
 499
 500 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 501                                         struct smbd_smb2_request *smb2req,
 502                                         uint8_t in_security_mode,
 503                                         DATA_BLOB in_security_buffer,
 504                                         uint16_t *out_session_flags,
 505                                         DATA_BLOB *out_security_buffer,
 506                                         uint64_t *out_session_id)
 507 {
 508         DATA_BLOB auth = data_blob_null;
 509         DATA_BLOB auth_out = data_blob_null;
 510         NTSTATUS status;
 511
 512         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 513                 TALLOC_FREE(session);
 514                 return NT_STATUS_LOGON_FAILURE;
 515         }
 516
 517         if (auth.data[0] == ASN1_APPLICATION(0)) {
 518                 /* Might be a second negTokenTarg packet */
 519                 DATA_BLOB secblob_in = data_blob_null;
 520                 char *kerb_mech = NULL;
 521
 522                 status = parse_spnego_mechanisms(talloc_tos(),
 523                                 in_security_buffer,
 524                                 &secblob_in, &kerb_mech);
 525                 if (!NT_STATUS_IS_OK(status)) {
 526                         TALLOC_FREE(session);
 527                         return status;
 528                 }
 529
 530 #ifdef HAVE_KRB5
 531                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 532                                         USE_KERBEROS_KEYTAB) ) {
 533                         status = smbd_smb2_session_setup_krb5(session,
 534                                         smb2req,
 535                                         in_security_mode,
 536                                         &secblob_in,
 537                                         kerb_mech,
 538                                         out_session_flags,
 539                                         out_security_buffer,
 540                                         out_session_id);
 541
 542                         data_blob_free(&secblob_in);
 543                         TALLOC_FREE(kerb_mech);
 544                         if (!NT_STATUS_IS_OK(status)) {
 545                                 TALLOC_FREE(session);
 546                         }
 547                         return status;
 548                 }
 549 #endif
 550
 551                 /* Can't blunder into NTLMSSP auth if we have
 552                  * a krb5 ticket. */
 553
 554                 if (kerb_mech) {
 555                         DEBUG(3,("smb2: network "
 556                                 "misconfiguration, client sent us a "
 557                                 "krb5 ticket and kerberos security "
 558                                 "not enabled\n"));
 559                         TALLOC_FREE(session);
 560                         data_blob_free(&secblob_in);
 561                         TALLOC_FREE(kerb_mech);
 562                         return NT_STATUS_LOGON_FAILURE;
 563                 }
 564
 565                 data_blob_free(&secblob_in);
 566         }
 567
 568         if (session->auth_ntlmssp_state == NULL) {
 569                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 570                                             &session->auth_ntlmssp_state);
 571                 if (!NT_STATUS_IS_OK(status)) {
 572                         data_blob_free(&auth);
 573                         TALLOC_FREE(session);
 574                         return status;
 575                 }
 576
 577                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 578
 579                 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 580                 if (!NT_STATUS_IS_OK(status)) {
 581                         data_blob_free(&auth);
 582                         TALLOC_FREE(session);
 583                         return status;
 584                 }
 585         }
 586
 587         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 588                                      talloc_tos(), auth,
 589                                      &auth_out);
 590         /* If status is NT_STATUS_OK then we need to get the token.
 591          * Map to guest is now internal to auth_ntlmssp */
 592         if (NT_STATUS_IS_OK(status)) {
 593                 status = auth_ntlmssp_steal_session_info(session,
 594                                 session->auth_ntlmssp_state,
 595                                 &session->session_info);
 596         }
 597
 598         if (!NT_STATUS_IS_OK(status) &&
 599                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 600                 TALLOC_FREE(session->auth_ntlmssp_state);
 601                 data_blob_free(&auth);
 602                 TALLOC_FREE(session);
 603                 return status;
 604         }
 605
 606         data_blob_free(&auth);
 607
 608         *out_security_buffer = spnego_gen_auth_response(smb2req,
 609                                 &auth_out, status, NULL);
 610
 611         if (out_security_buffer->data == NULL) {
 612                 TALLOC_FREE(session->auth_ntlmssp_state);
 613                 TALLOC_FREE(session);
 614                 return NT_STATUS_NO_MEMORY;
 615         }
 616
 617         *out_session_id = session->vuid;
 618
 619         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 620                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 621         }
 622
 623         /* We're done - claim the session. */
 624         return smbd_smb2_common_ntlmssp_auth_return(session,
 625                                                 smb2req,
 626                                                 in_security_mode,
 627                                                 in_security_buffer,
 628                                                 out_session_flags,
 629                                                 out_session_id);
 630 }
 631
 632 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 633                                         struct smbd_smb2_request *smb2req,
 634                                         uint8_t in_security_mode,
 635                                         DATA_BLOB in_security_buffer,
 636                                         uint16_t *out_session_flags,
 637                                         DATA_BLOB *out_security_buffer,
 638                                         uint64_t *out_session_id)
 639 {
 640         NTSTATUS status;
 641
 642         if (session->auth_ntlmssp_state == NULL) {
 643                 status = auth_ntlmssp_prepare(session->sconn->remote_address,
 644                                             &session->auth_ntlmssp_state);
 645                 if (!NT_STATUS_IS_OK(status)) {
 646                         TALLOC_FREE(session);
 647                         return status;
 648                 }
 649
 650                 auth_ntlmssp_want_feature(session->auth_ntlmssp_state, NTLMSSP_FEATURE_SESSION_KEY);
 651
 652                 status = auth_ntlmssp_start(session->auth_ntlmssp_state);
 653                 if (!NT_STATUS_IS_OK(status)) {
 654                         TALLOC_FREE(session);
 655                         return status;
 656                 }
 657         }
 658
 659         /* RAW NTLMSSP */
 660         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 661                                      smb2req,
 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 = auth_ntlmssp_steal_session_info(session,
 671                                                  session->auth_ntlmssp_state,
 672                                                  &session->session_info);
 673
 674         if (!NT_STATUS_IS_OK(status)) {
 675                 TALLOC_FREE(session->auth_ntlmssp_state);
 676                 TALLOC_FREE(session);
 677                 return status;
 678         }
 679         *out_session_id = session->vuid;
 680
 681         return smbd_smb2_common_ntlmssp_auth_return(session,
 682                                                 smb2req,
 683                                                 in_security_mode,
 684                                                 in_security_buffer,
 685                                                 out_session_flags,
 686                                                 out_session_id);
 687 }
 688
 689 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 690                                         uint64_t in_session_id,
 691                                         uint8_t in_security_mode,
 692                                         DATA_BLOB in_security_buffer,
 693                                         uint16_t *out_session_flags,
 694                                         DATA_BLOB *out_security_buffer,
 695                                         uint64_t *out_session_id)
 696 {
 697         struct smbd_smb2_session *session;
 698
 699         *out_session_flags = 0;
 700         *out_session_id = 0;
 701
 702         if (in_session_id == 0) {
 703                 int id;
 704
 705                 /* create a new session */
 706                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 707                 if (session == NULL) {
 708                         return NT_STATUS_NO_MEMORY;
 709                 }
 710                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 711                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 712                                         session,
 713                                         smb2req->sconn->smb2.sessions.limit);
 714                 if (id == -1) {
 715                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 716                 }
 717                 session->vuid = id;
 718
 719                 session->tcons.idtree = idr_init(session);
 720                 if (session->tcons.idtree == NULL) {
 721                         return NT_STATUS_NO_MEMORY;
 722                 }
 723                 session->tcons.limit = 0x0000FFFE;
 724                 session->tcons.list = NULL;
 725
 726                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 727                               struct smbd_smb2_session *);
 728                 session->sconn = smb2req->sconn;
 729                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 730         } else {
 731                 void *p;
 732
 733                 /* lookup an existing session */
 734                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 735                 if (p == NULL) {
 736                         return NT_STATUS_USER_SESSION_DELETED;
 737                 }
 738                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 739         }
 740
 741         if (NT_STATUS_IS_OK(session->status)) {
 742                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 743         }
 744
 745         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 746                 return smbd_smb2_spnego_negotiate(session,
 747                                                 smb2req,
 748                                                 in_security_mode,
 749                                                 in_security_buffer,
 750                                                 out_session_flags,
 751                                                 out_security_buffer,
 752                                                 out_session_id);
 753         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 754                 return smbd_smb2_spnego_auth(session,
 755                                                 smb2req,
 756                                                 in_security_mode,
 757                                                 in_security_buffer,
 758                                                 out_session_flags,
 759                                                 out_security_buffer,
 760                                                 out_session_id);
 761         } else if (in_security_buffer.length > 7 && strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 762                 return smbd_smb2_raw_ntlmssp_auth(session,
 763                                                 smb2req,
 764                                                 in_security_mode,
 765                                                 in_security_buffer,
 766                                                 out_session_flags,
 767                                                 out_security_buffer,
 768                                                 out_session_id);
 769         }
 770
 771         /* Unknown packet type. */
 772         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 773                 (unsigned int)in_security_buffer.data[0] ));
 774         TALLOC_FREE(session->auth_ntlmssp_state);
 775         TALLOC_FREE(session);
 776         return NT_STATUS_LOGON_FAILURE;
 777 }
 778
 779 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 780 {
 781         const uint8_t *inbody;
 782         int i = req->current_idx;
 783         DATA_BLOB outbody;
 784         size_t expected_body_size = 0x04;
 785         size_t body_size;
 786
 787         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 788                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 789         }
 790
 791         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 792
 793         body_size = SVAL(inbody, 0x00);
 794         if (body_size != expected_body_size) {
 795                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 796         }
 797
 798         /*
 799          * TODO: cancel all outstanding requests on the session
 800          *       and delete all tree connections.
 801          */
 802         smbd_smb2_session_destructor(req->session);
 803         /*
 804          * we may need to sign the response, so we need to keep
 805          * the session until the response is sent to the wire.
 806          */
 807         talloc_steal(req, req->session);
 808
 809         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 810         if (outbody.data == NULL) {
 811                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 812         }
 813
 814         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 815         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 816
 817         return smbd_smb2_request_done(req, outbody, NULL);
 818 }