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
  34 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
  35                                         uint64_t in_session_id,
  36                                         uint8_t in_security_mode,
  37                                         DATA_BLOB in_security_buffer,
  38                                         uint16_t *out_session_flags,
  39                                         DATA_BLOB *out_security_buffer,
  40                                         uint64_t *out_session_id);
  41
  42 NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *smb2req)
  43 {
  44         const uint8_t *inhdr;
  45         const uint8_t *inbody;
  46         int i = smb2req->current_idx;
  47         uint8_t *outhdr;
  48         DATA_BLOB outbody;
  49         DATA_BLOB outdyn;
  50         uint64_t in_session_id;
  51         uint8_t in_security_mode;
  52         uint16_t in_security_offset;
  53         uint16_t in_security_length;
  54         DATA_BLOB in_security_buffer;
  55         uint16_t out_session_flags;
  56         uint64_t out_session_id;
  57         uint16_t out_security_offset;
  58         DATA_BLOB out_security_buffer = data_blob_null;
  59         NTSTATUS status;
  60
  61         status = smbd_smb2_request_verify_sizes(smb2req, 0x19);
  62         if (!NT_STATUS_IS_OK(status)) {
  63                 return smbd_smb2_request_error(smb2req, status);
  64         }
  65         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  66         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  67
  68         in_security_offset = SVAL(inbody, 0x0C);
  69         in_security_length = SVAL(inbody, 0x0E);
  70
  71         if (in_security_offset != (SMB2_HDR_BODY + smb2req->in.vector[i+1].iov_len)) {
  72                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  73         }
  74
  75         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  76                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  77         }
  78
  79         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  80         in_security_mode = CVAL(inbody, 0x03);
  81         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  82         in_security_buffer.length = in_security_length;
  83
  84         status = smbd_smb2_session_setup(smb2req,
  85                                          in_session_id,
  86                                          in_security_mode,
  87                                          in_security_buffer,
  88                                          &out_session_flags,
  89                                          &out_security_buffer,
  90                                          &out_session_id);
  91         if (!NT_STATUS_IS_OK(status) &&
  92             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
  93                 status = nt_status_squash(status);
  94                 return smbd_smb2_request_error(smb2req, status);
  95         }
  96
  97         out_security_offset = SMB2_HDR_BODY + 0x08;
  98
  99         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 100
 101         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 102         if (outbody.data == NULL) {
 103                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 104         }
 105
 106         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 107
 108         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 109         SSVAL(outbody.data, 0x02,
 110               out_session_flags);               /* session flags */
 111         SSVAL(outbody.data, 0x04,
 112               out_security_offset);             /* security buffer offset */
 113         SSVAL(outbody.data, 0x06,
 114               out_security_buffer.length);      /* security buffer length */
 115
 116         outdyn = out_security_buffer;
 117
 118         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 119                                          __location__);
 120 }
 121
 122 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 123 {
 124         if (session->sconn == NULL) {
 125                 return 0;
 126         }
 127
 128         /* first free all tcons */
 129         while (session->tcons.list) {
 130                 talloc_free(session->tcons.list);
 131         }
 132
 133         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 134         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 135         invalidate_vuid(session->sconn, session->vuid);
 136
 137         session->vuid = 0;
 138         session->status = NT_STATUS_USER_SESSION_DELETED;
 139         session->sconn = NULL;
 140
 141         return 0;
 142 }
 143
 144 static NTSTATUS setup_ntlmssp_session_info(struct smbd_smb2_session *session,
 145                                 NTSTATUS status)
 146 {
 147         if (NT_STATUS_IS_OK(status)) {
 148                 status = auth_ntlmssp_steal_session_info(session,
 149                                 session->auth_ntlmssp_state,
 150                                 &session->session_info);
 151         } else {
 152                 /* Note that this session_info won't have a session
 153                  * key.  But for map to guest, that's exactly the right
 154                  * thing - we can't reasonably guess the key the
 155                  * client wants, as the password was wrong */
 156                 status = do_map_to_guest(status,
 157                         &session->session_info,
 158                         auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 159                         auth_ntlmssp_get_domain(session->auth_ntlmssp_state));
 160         }
 161         return status;
 162 }
 163
 164 #ifdef HAVE_KRB5
 165 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 166                                         struct smbd_smb2_request *smb2req,
 167                                         uint8_t in_security_mode,
 168                                         const DATA_BLOB *secblob,
 169                                         const char *mechOID,
 170                                         uint16_t *out_session_flags,
 171                                         DATA_BLOB *out_security_buffer,
 172                                         uint64_t *out_session_id)
 173 {
 174         DATA_BLOB ap_rep = data_blob_null;
 175         DATA_BLOB ap_rep_wrapped = data_blob_null;
 176         DATA_BLOB ticket = data_blob_null;
 177         DATA_BLOB session_key = data_blob_null;
 178         DATA_BLOB secblob_out = data_blob_null;
 179         uint8 tok_id[2];
 180         struct PAC_LOGON_INFO *logon_info = NULL;
 181         char *principal = NULL;
 182         char *user = NULL;
 183         char *domain = NULL;
 184         struct passwd *pw = NULL;
 185         NTSTATUS status;
 186         char *real_username;
 187         fstring tmp;
 188         bool username_was_mapped = false;
 189         bool map_domainuser_to_guest = false;
 190
 191         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 192                 status = NT_STATUS_LOGON_FAILURE;
 193                 goto fail;
 194         }
 195
 196         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 197                                    &principal, &logon_info, &ap_rep,
 198                                    &session_key, true);
 199
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 202                         nt_errstr(status)));
 203                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 204                         status = NT_STATUS_LOGON_FAILURE;
 205                 }
 206                 goto fail;
 207         }
 208
 209         status = get_user_from_kerberos_info(talloc_tos(),
 210                                              smb2req->sconn->client_id.name,
 211                                              principal, logon_info,
 212                                              &username_was_mapped,
 213                                              &map_domainuser_to_guest,
 214                                              &user, &domain,
 215                                              &real_username, &pw);
 216         if (!NT_STATUS_IS_OK(status)) {
 217                 goto fail;
 218         }
 219
 220         /* save the PAC data if we have it */
 221         if (logon_info) {
 222                 netsamlogon_cache_store(user, &logon_info->info3);
 223         }
 224
 225         /* setup the string used by %U */
 226         sub_set_smb_name(real_username);
 227
 228         /* reload services so that the new %U is taken into account */
 229         reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
 230
 231         status = make_server_info_krb5(session,
 232                                         user, domain, real_username, pw,
 233                                         logon_info, map_domainuser_to_guest,
 234                                         &session->session_info);
 235         if (!NT_STATUS_IS_OK(status)) {
 236                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 237                 goto fail;
 238         }
 239
 240
 241         session->session_info->nss_token |= username_was_mapped;
 242
 243         /* we need to build the token for the user. make_session_info_guest()
 244            already does this */
 245
 246         if (!session->session_info->security_token ) {
 247                 status = create_local_token(session->session_info);
 248                 if (!NT_STATUS_IS_OK(status)) {
 249                         DEBUG(10,("smb2: failed to create local token: %s\n",
 250                                 nt_errstr(status)));
 251                         goto fail;
 252                 }
 253         }
 254
 255         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 256              lp_server_signing() == Required) {
 257                 session->do_signing = true;
 258         }
 259
 260         if (session->session_info->guest) {
 261                 /* we map anonymous to guest internally */
 262                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 263                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 264                 /* force no signing */
 265                 session->do_signing = false;
 266         }
 267
 268         data_blob_free(&session->session_info->user_session_key);
 269         session->session_info->user_session_key =
 270                         data_blob_talloc(
 271                                 session->session_info,
 272                                 session_key.data,
 273                                 session_key.length);
 274         if (session_key.length > 0) {
 275                 if (session->session_info->user_session_key.data == NULL) {
 276                         status = NT_STATUS_NO_MEMORY;
 277                         goto fail;
 278                 }
 279         }
 280         session->session_key = session->session_info->user_session_key;
 281
 282         session->compat_vuser = talloc_zero(session, user_struct);
 283         if (session->compat_vuser == NULL) {
 284                 status = NT_STATUS_NO_MEMORY;
 285                 goto fail;
 286         }
 287         session->compat_vuser->auth_ntlmssp_state = NULL;
 288         session->compat_vuser->homes_snum = -1;
 289         session->compat_vuser->session_info = session->session_info;
 290         session->compat_vuser->session_keystr = NULL;
 291         session->compat_vuser->vuid = session->vuid;
 292         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 293
 294         /* This is a potentially untrusted username */
 295         alpha_strcpy(tmp, user, ". _-$", sizeof(tmp));
 296         session->session_info->sanitized_username =
 297                                 talloc_strdup(session->session_info, tmp);
 298
 299         if (!session->session_info->guest) {
 300                 session->compat_vuser->homes_snum =
 301                         register_homes_share(session->session_info->unix_name);
 302         }
 303
 304         if (!session_claim(session->sconn, session->compat_vuser)) {
 305                 DEBUG(1, ("smb2: Failed to claim session "
 306                         "for vuid=%d\n",
 307                         session->compat_vuser->vuid));
 308                 goto fail;
 309         }
 310
 311         session->status = NT_STATUS_OK;
 312
 313         /*
 314          * we attach the session to the request
 315          * so that the response can be signed
 316          */
 317         smb2req->session = session;
 318         if (session->do_signing) {
 319                 smb2req->do_signing = true;
 320         }
 321
 322         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 323         status = NT_STATUS_OK;
 324
 325         /* wrap that up in a nice GSS-API wrapping */
 326         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 327                                 TOK_ID_KRB_AP_REP);
 328
 329         secblob_out = spnego_gen_auth_response(
 330                                         talloc_tos(),
 331                                         &ap_rep_wrapped,
 332                                         status,
 333                                         mechOID);
 334
 335         *out_security_buffer = data_blob_talloc(smb2req,
 336                                                 secblob_out.data,
 337                                                 secblob_out.length);
 338         if (secblob_out.data && out_security_buffer->data == NULL) {
 339                 status = NT_STATUS_NO_MEMORY;
 340                 goto fail;
 341         }
 342
 343         data_blob_free(&ap_rep);
 344         data_blob_free(&ap_rep_wrapped);
 345         data_blob_free(&ticket);
 346         data_blob_free(&session_key);
 347         data_blob_free(&secblob_out);
 348
 349         *out_session_id = session->vuid;
 350
 351         return NT_STATUS_OK;
 352
 353   fail:
 354
 355         data_blob_free(&ap_rep);
 356         data_blob_free(&ap_rep_wrapped);
 357         data_blob_free(&ticket);
 358         data_blob_free(&session_key);
 359         data_blob_free(&secblob_out);
 360
 361         ap_rep_wrapped = data_blob_null;
 362         secblob_out = spnego_gen_auth_response(
 363                                         talloc_tos(),
 364                                         &ap_rep_wrapped,
 365                                         status,
 366                                         mechOID);
 367
 368         *out_security_buffer = data_blob_talloc(smb2req,
 369                                                 secblob_out.data,
 370                                                 secblob_out.length);
 371         data_blob_free(&secblob_out);
 372         return status;
 373 }
 374 #endif
 375
 376 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 377                                         struct smbd_smb2_request *smb2req,
 378                                         uint8_t in_security_mode,
 379                                         DATA_BLOB in_security_buffer,
 380                                         uint16_t *out_session_flags,
 381                                         DATA_BLOB *out_security_buffer,
 382                                         uint64_t *out_session_id)
 383 {
 384         DATA_BLOB secblob_in = data_blob_null;
 385         DATA_BLOB chal_out = data_blob_null;
 386         char *kerb_mech = NULL;
 387         NTSTATUS status;
 388
 389         /* Ensure we have no old NTLM state around. */
 390         TALLOC_FREE(session->auth_ntlmssp_state);
 391
 392         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 393                         &secblob_in, &kerb_mech);
 394         if (!NT_STATUS_IS_OK(status)) {
 395                 goto out;
 396         }
 397
 398 #ifdef HAVE_KRB5
 399         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 400                                 USE_KERBEROS_KEYTAB) ) {
 401                 status = smbd_smb2_session_setup_krb5(session,
 402                                 smb2req,
 403                                 in_security_mode,
 404                                 &secblob_in,
 405                                 kerb_mech,
 406                                 out_session_flags,
 407                                 out_security_buffer,
 408                                 out_session_id);
 409
 410                 goto out;
 411         }
 412 #endif
 413
 414         if (kerb_mech) {
 415                 /* The mechtoken is a krb5 ticket, but
 416                  * we need to fall back to NTLM. */
 417
 418                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 419                         "but set to downgrade to NTLMSSP\n"));
 420
 421                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 422         } else {
 423                 /* Fall back to NTLMSSP. */
 424                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 425                 if (!NT_STATUS_IS_OK(status)) {
 426                         goto out;
 427                 }
 428
 429                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 430                                              secblob_in,
 431                                              &chal_out);
 432         }
 433
 434         if (!NT_STATUS_IS_OK(status) &&
 435                         !NT_STATUS_EQUAL(status,
 436                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 437                 goto out;
 438         }
 439
 440         *out_security_buffer = spnego_gen_auth_response(smb2req,
 441                                                 &chal_out,
 442                                                 status,
 443                                                 OID_NTLMSSP);
 444         if (out_security_buffer->data == NULL) {
 445                 status = NT_STATUS_NO_MEMORY;
 446                 goto out;
 447         }
 448         *out_session_id = session->vuid;
 449
 450   out:
 451
 452         data_blob_free(&secblob_in);
 453         data_blob_free(&chal_out);
 454         TALLOC_FREE(kerb_mech);
 455         if (!NT_STATUS_IS_OK(status) &&
 456                         !NT_STATUS_EQUAL(status,
 457                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 458                 TALLOC_FREE(session->auth_ntlmssp_state);
 459                 TALLOC_FREE(session);
 460         }
 461         return status;
 462 }
 463
 464 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 465                                         struct smbd_smb2_request *smb2req,
 466                                         uint8_t in_security_mode,
 467                                         DATA_BLOB in_security_buffer,
 468                                         uint16_t *out_session_flags,
 469                                         uint64_t *out_session_id)
 470 {
 471         fstring tmp;
 472
 473         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 474             lp_server_signing() == Required) {
 475                 session->do_signing = true;
 476         }
 477
 478         if (session->session_info->guest) {
 479                 /* we map anonymous to guest internally */
 480                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 481                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 482                 /* force no signing */
 483                 session->do_signing = false;
 484         }
 485
 486         session->session_key = session->session_info->user_session_key;
 487
 488         session->compat_vuser = talloc_zero(session, user_struct);
 489         if (session->compat_vuser == NULL) {
 490                 TALLOC_FREE(session->auth_ntlmssp_state);
 491                 TALLOC_FREE(session);
 492                 return NT_STATUS_NO_MEMORY;
 493         }
 494         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 495         session->compat_vuser->homes_snum = -1;
 496         session->compat_vuser->session_info = session->session_info;
 497         session->compat_vuser->session_keystr = NULL;
 498         session->compat_vuser->vuid = session->vuid;
 499         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 500
 501         /* This is a potentially untrusted username */
 502         alpha_strcpy(tmp,
 503                      auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 504                      ". _-$",
 505                      sizeof(tmp));
 506         session->session_info->sanitized_username = talloc_strdup(
 507                 session->session_info, tmp);
 508
 509         if (!session->compat_vuser->session_info->guest) {
 510                 session->compat_vuser->homes_snum =
 511                         register_homes_share(session->session_info->unix_name);
 512         }
 513
 514         if (!session_claim(session->sconn, session->compat_vuser)) {
 515                 DEBUG(1, ("smb2: Failed to claim session "
 516                         "for vuid=%d\n",
 517                         session->compat_vuser->vuid));
 518                 TALLOC_FREE(session->auth_ntlmssp_state);
 519                 TALLOC_FREE(session);
 520                 return NT_STATUS_LOGON_FAILURE;
 521         }
 522
 523
 524         session->status = NT_STATUS_OK;
 525
 526         /*
 527          * we attach the session to the request
 528          * so that the response can be signed
 529          */
 530         smb2req->session = session;
 531         if (session->do_signing) {
 532                 smb2req->do_signing = true;
 533         }
 534
 535         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 536
 537         *out_session_id = session->vuid;
 538
 539         return NT_STATUS_OK;
 540 }
 541
 542 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 543                                         struct smbd_smb2_request *smb2req,
 544                                         uint8_t in_security_mode,
 545                                         DATA_BLOB in_security_buffer,
 546                                         uint16_t *out_session_flags,
 547                                         DATA_BLOB *out_security_buffer,
 548                                         uint64_t *out_session_id)
 549 {
 550         DATA_BLOB auth = data_blob_null;
 551         DATA_BLOB auth_out = data_blob_null;
 552         NTSTATUS status;
 553
 554         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 555                 TALLOC_FREE(session);
 556                 return NT_STATUS_LOGON_FAILURE;
 557         }
 558
 559         if (auth.data[0] == ASN1_APPLICATION(0)) {
 560                 /* Might be a second negTokenTarg packet */
 561                 DATA_BLOB secblob_in = data_blob_null;
 562                 char *kerb_mech = NULL;
 563
 564                 status = parse_spnego_mechanisms(talloc_tos(),
 565                                 in_security_buffer,
 566                                 &secblob_in, &kerb_mech);
 567                 if (!NT_STATUS_IS_OK(status)) {
 568                         TALLOC_FREE(session);
 569                         return status;
 570                 }
 571
 572 #ifdef HAVE_KRB5
 573                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 574                                         USE_KERBEROS_KEYTAB) ) {
 575                         status = smbd_smb2_session_setup_krb5(session,
 576                                         smb2req,
 577                                         in_security_mode,
 578                                         &secblob_in,
 579                                         kerb_mech,
 580                                         out_session_flags,
 581                                         out_security_buffer,
 582                                         out_session_id);
 583
 584                         data_blob_free(&secblob_in);
 585                         TALLOC_FREE(kerb_mech);
 586                         if (!NT_STATUS_IS_OK(status)) {
 587                                 TALLOC_FREE(session);
 588                         }
 589                         return status;
 590                 }
 591 #endif
 592
 593                 /* Can't blunder into NTLMSSP auth if we have
 594                  * a krb5 ticket. */
 595
 596                 if (kerb_mech) {
 597                         DEBUG(3,("smb2: network "
 598                                 "misconfiguration, client sent us a "
 599                                 "krb5 ticket and kerberos security "
 600                                 "not enabled\n"));
 601                         TALLOC_FREE(session);
 602                         data_blob_free(&secblob_in);
 603                         TALLOC_FREE(kerb_mech);
 604                         return NT_STATUS_LOGON_FAILURE;
 605                 }
 606
 607                 data_blob_free(&secblob_in);
 608         }
 609
 610         if (session->auth_ntlmssp_state == NULL) {
 611                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 612                 if (!NT_STATUS_IS_OK(status)) {
 613                         data_blob_free(&auth);
 614                         TALLOC_FREE(session);
 615                         return status;
 616                 }
 617         }
 618
 619         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 620                                      auth,
 621                                      &auth_out);
 622         /* We need to call setup_ntlmssp_session_info() if status==NT_STATUS_OK,
 623            or if status is anything except NT_STATUS_MORE_PROCESSING_REQUIRED,
 624            as this can trigger map to guest. */
 625         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 626                 status = setup_ntlmssp_session_info(session, status);
 627         }
 628
 629         if (!NT_STATUS_IS_OK(status) &&
 630                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 631                 TALLOC_FREE(session->auth_ntlmssp_state);
 632                 data_blob_free(&auth);
 633                 TALLOC_FREE(session);
 634                 return status;
 635         }
 636
 637         data_blob_free(&auth);
 638
 639         *out_security_buffer = spnego_gen_auth_response(smb2req,
 640                                 &auth_out, status, NULL);
 641
 642         if (out_security_buffer->data == NULL) {
 643                 TALLOC_FREE(session->auth_ntlmssp_state);
 644                 TALLOC_FREE(session);
 645                 return NT_STATUS_NO_MEMORY;
 646         }
 647
 648         *out_session_id = session->vuid;
 649
 650         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 651                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 652         }
 653
 654         /* We're done - claim the session. */
 655         return smbd_smb2_common_ntlmssp_auth_return(session,
 656                                                 smb2req,
 657                                                 in_security_mode,
 658                                                 in_security_buffer,
 659                                                 out_session_flags,
 660                                                 out_session_id);
 661 }
 662
 663 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 664                                         struct smbd_smb2_request *smb2req,
 665                                         uint8_t in_security_mode,
 666                                         DATA_BLOB in_security_buffer,
 667                                         uint16_t *out_session_flags,
 668                                         DATA_BLOB *out_security_buffer,
 669                                         uint64_t *out_session_id)
 670 {
 671         NTSTATUS status;
 672         DATA_BLOB secblob_out = data_blob_null;
 673
 674         *out_security_buffer = data_blob_null;
 675
 676         if (session->auth_ntlmssp_state == NULL) {
 677                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 678                 if (!NT_STATUS_IS_OK(status)) {
 679                         TALLOC_FREE(session);
 680                         return status;
 681                 }
 682         }
 683
 684         /* RAW NTLMSSP */
 685         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 686                                      in_security_buffer,
 687                                      &secblob_out);
 688
 689         if (NT_STATUS_IS_OK(status) ||
 690                         NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 691                 *out_security_buffer = data_blob_talloc(smb2req,
 692                                                 secblob_out.data,
 693                                                 secblob_out.length);
 694                 if (secblob_out.data && out_security_buffer->data == NULL) {
 695                         TALLOC_FREE(session->auth_ntlmssp_state);
 696                         TALLOC_FREE(session);
 697                         return NT_STATUS_NO_MEMORY;
 698                 }
 699         }
 700
 701         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 702                 *out_session_id = session->vuid;
 703                 return status;
 704         }
 705
 706         status = setup_ntlmssp_session_info(session, status);
 707
 708         if (!NT_STATUS_IS_OK(status)) {
 709                 TALLOC_FREE(session->auth_ntlmssp_state);
 710                 TALLOC_FREE(session);
 711                 return status;
 712         }
 713         *out_session_id = session->vuid;
 714
 715         return smbd_smb2_common_ntlmssp_auth_return(session,
 716                                                 smb2req,
 717                                                 in_security_mode,
 718                                                 in_security_buffer,
 719                                                 out_session_flags,
 720                                                 out_session_id);
 721 }
 722
 723 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 724                                         uint64_t in_session_id,
 725                                         uint8_t in_security_mode,
 726                                         DATA_BLOB in_security_buffer,
 727                                         uint16_t *out_session_flags,
 728                                         DATA_BLOB *out_security_buffer,
 729                                         uint64_t *out_session_id)
 730 {
 731         struct smbd_smb2_session *session;
 732
 733         *out_session_flags = 0;
 734         *out_session_id = 0;
 735
 736         if (in_session_id == 0) {
 737                 int id;
 738
 739                 /* create a new session */
 740                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 741                 if (session == NULL) {
 742                         return NT_STATUS_NO_MEMORY;
 743                 }
 744                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 745                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 746                                         session,
 747                                         smb2req->sconn->smb2.sessions.limit);
 748                 if (id == -1) {
 749                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 750                 }
 751                 session->vuid = id;
 752
 753                 session->tcons.idtree = idr_init(session);
 754                 if (session->tcons.idtree == NULL) {
 755                         return NT_STATUS_NO_MEMORY;
 756                 }
 757                 session->tcons.limit = 0x0000FFFE;
 758                 session->tcons.list = NULL;
 759
 760                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 761                               struct smbd_smb2_session *);
 762                 session->sconn = smb2req->sconn;
 763                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 764         } else {
 765                 void *p;
 766
 767                 /* lookup an existing session */
 768                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 769                 if (p == NULL) {
 770                         return NT_STATUS_USER_SESSION_DELETED;
 771                 }
 772                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 773         }
 774
 775         if (NT_STATUS_IS_OK(session->status)) {
 776                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 777         }
 778
 779         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 780                 return smbd_smb2_spnego_negotiate(session,
 781                                                 smb2req,
 782                                                 in_security_mode,
 783                                                 in_security_buffer,
 784                                                 out_session_flags,
 785                                                 out_security_buffer,
 786                                                 out_session_id);
 787         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 788                 return smbd_smb2_spnego_auth(session,
 789                                                 smb2req,
 790                                                 in_security_mode,
 791                                                 in_security_buffer,
 792                                                 out_session_flags,
 793                                                 out_security_buffer,
 794                                                 out_session_id);
 795         } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 796                 return smbd_smb2_raw_ntlmssp_auth(session,
 797                                                 smb2req,
 798                                                 in_security_mode,
 799                                                 in_security_buffer,
 800                                                 out_session_flags,
 801                                                 out_security_buffer,
 802                                                 out_session_id);
 803         }
 804
 805         /* Unknown packet type. */
 806         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 807                 (unsigned int)in_security_buffer.data[0] ));
 808         TALLOC_FREE(session->auth_ntlmssp_state);
 809         TALLOC_FREE(session);
 810         return NT_STATUS_LOGON_FAILURE;
 811 }
 812
 813 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 814 {
 815         const uint8_t *inhdr;
 816         int i = req->current_idx;
 817         uint32_t in_flags;
 818         uint64_t in_session_id;
 819         void *p;
 820         struct smbd_smb2_session *session;
 821
 822         req->session = NULL;
 823         req->tcon = NULL;
 824
 825         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 826
 827         in_flags = IVAL(inhdr, SMB2_HDR_FLAGS);
 828         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 829
 830         if (in_flags & SMB2_HDR_FLAG_CHAINED) {
 831                 in_session_id = req->last_session_id;
 832         }
 833
 834         /* lookup an existing session */
 835         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 836         if (p == NULL) {
 837                 return NT_STATUS_USER_SESSION_DELETED;
 838         }
 839         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 840
 841         if (!NT_STATUS_IS_OK(session->status)) {
 842                 return NT_STATUS_ACCESS_DENIED;
 843         }
 844
 845         set_current_user_info(session->session_info->sanitized_username,
 846                               session->session_info->unix_name,
 847                               session->session_info->info3->base.domain.string);
 848
 849         req->session = session;
 850         req->last_session_id = in_session_id;
 851
 852         return NT_STATUS_OK;
 853 }
 854
 855 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 856 {
 857         NTSTATUS status;
 858         DATA_BLOB outbody;
 859
 860         status = smbd_smb2_request_verify_sizes(req, 0x04);
 861         if (!NT_STATUS_IS_OK(status)) {
 862                 return smbd_smb2_request_error(req, status);
 863         }
 864
 865         /*
 866          * TODO: cancel all outstanding requests on the session
 867          *       and delete all tree connections.
 868          */
 869         smbd_smb2_session_destructor(req->session);
 870         /*
 871          * we may need to sign the response, so we need to keep
 872          * the session until the response is sent to the wire.
 873          */
 874         talloc_steal(req, req->session);
 875
 876         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 877         if (outbody.data == NULL) {
 878                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 879         }
 880
 881         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 882         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 883
 884         return smbd_smb2_request_done(req, outbody, NULL);
 885 }