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         size_t expected_body_size = 0x19;
  51         size_t body_size;
  52         uint64_t in_session_id;
  53         uint8_t in_security_mode;
  54         uint16_t in_security_offset;
  55         uint16_t in_security_length;
  56         DATA_BLOB in_security_buffer;
  57         uint16_t out_session_flags;
  58         uint64_t out_session_id;
  59         uint16_t out_security_offset;
  60         DATA_BLOB out_security_buffer;
  61         NTSTATUS status;
  62
  63         inhdr = (const uint8_t *)smb2req->in.vector[i+0].iov_base;
  64
  65         if (smb2req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
  66                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  67         }
  68
  69         inbody = (const uint8_t *)smb2req->in.vector[i+1].iov_base;
  70
  71         body_size = SVAL(inbody, 0x00);
  72         if (body_size != expected_body_size) {
  73                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  74         }
  75
  76         in_security_offset = SVAL(inbody, 0x0C);
  77         in_security_length = SVAL(inbody, 0x0E);
  78
  79         if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
  80                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  81         }
  82
  83         if (in_security_length > smb2req->in.vector[i+2].iov_len) {
  84                 return smbd_smb2_request_error(smb2req, NT_STATUS_INVALID_PARAMETER);
  85         }
  86
  87         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
  88         in_security_mode = CVAL(inbody, 0x03);
  89         in_security_buffer.data = (uint8_t *)smb2req->in.vector[i+2].iov_base;
  90         in_security_buffer.length = in_security_length;
  91
  92         status = smbd_smb2_session_setup(smb2req,
  93                                          in_session_id,
  94                                          in_security_mode,
  95                                          in_security_buffer,
  96                                          &out_session_flags,
  97                                          &out_security_buffer,
  98                                          &out_session_id);
  99         if (!NT_STATUS_IS_OK(status) &&
 100             !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 101                 status = nt_status_squash(status);
 102                 return smbd_smb2_request_error(smb2req, status);
 103         }
 104
 105         out_security_offset = SMB2_HDR_BODY + 0x08;
 106
 107         outhdr = (uint8_t *)smb2req->out.vector[i].iov_base;
 108
 109         outbody = data_blob_talloc(smb2req->out.vector, NULL, 0x08);
 110         if (outbody.data == NULL) {
 111                 return smbd_smb2_request_error(smb2req, NT_STATUS_NO_MEMORY);
 112         }
 113
 114         SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
 115
 116         SSVAL(outbody.data, 0x00, 0x08 + 1);    /* struct size */
 117         SSVAL(outbody.data, 0x02,
 118               out_session_flags);               /* session flags */
 119         SSVAL(outbody.data, 0x04,
 120               out_security_offset);             /* security buffer offset */
 121         SSVAL(outbody.data, 0x06,
 122               out_security_buffer.length);      /* security buffer length */
 123
 124         outdyn = out_security_buffer;
 125
 126         return smbd_smb2_request_done_ex(smb2req, status, outbody, &outdyn,
 127                                          __location__);
 128 }
 129
 130 static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
 131 {
 132         if (session->sconn == NULL) {
 133                 return 0;
 134         }
 135
 136         /* first free all tcons */
 137         while (session->tcons.list) {
 138                 talloc_free(session->tcons.list);
 139         }
 140
 141         idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
 142         DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
 143         invalidate_vuid(session->sconn, session->vuid);
 144
 145         session->vuid = 0;
 146         session->status = NT_STATUS_USER_SESSION_DELETED;
 147         session->sconn = NULL;
 148
 149         return 0;
 150 }
 151
 152 static NTSTATUS setup_ntlmssp_session_info(struct smbd_smb2_session *session,
 153                                 NTSTATUS status)
 154 {
 155         if (NT_STATUS_IS_OK(status)) {
 156                 status = auth_ntlmssp_steal_session_info(session,
 157                                 session->auth_ntlmssp_state,
 158                                 &session->session_info);
 159         } else {
 160                 /* Note that this session_info won't have a session
 161                  * key.  But for map to guest, that's exactly the right
 162                  * thing - we can't reasonably guess the key the
 163                  * client wants, as the password was wrong */
 164                 status = do_map_to_guest(status,
 165                         &session->session_info,
 166                         auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 167                         auth_ntlmssp_get_domain(session->auth_ntlmssp_state));
 168         }
 169         return status;
 170 }
 171
 172 #ifdef HAVE_KRB5
 173 static NTSTATUS smbd_smb2_session_setup_krb5(struct smbd_smb2_session *session,
 174                                         struct smbd_smb2_request *smb2req,
 175                                         uint8_t in_security_mode,
 176                                         const DATA_BLOB *secblob,
 177                                         const char *mechOID,
 178                                         uint16_t *out_session_flags,
 179                                         DATA_BLOB *out_security_buffer,
 180                                         uint64_t *out_session_id)
 181 {
 182         DATA_BLOB ap_rep = data_blob_null;
 183         DATA_BLOB ap_rep_wrapped = data_blob_null;
 184         DATA_BLOB ticket = data_blob_null;
 185         DATA_BLOB session_key = data_blob_null;
 186         DATA_BLOB secblob_out = data_blob_null;
 187         uint8 tok_id[2];
 188         struct PAC_LOGON_INFO *logon_info = NULL;
 189         char *principal = NULL;
 190         char *user = NULL;
 191         char *domain = NULL;
 192         struct passwd *pw = NULL;
 193         NTSTATUS status;
 194         char *real_username;
 195         fstring tmp;
 196         bool username_was_mapped = false;
 197         bool map_domainuser_to_guest = false;
 198
 199         if (!spnego_parse_krb5_wrap(talloc_tos(), *secblob, &ticket, tok_id)) {
 200                 status = NT_STATUS_LOGON_FAILURE;
 201                 goto fail;
 202         }
 203
 204         status = ads_verify_ticket(smb2req, lp_realm(), 0, &ticket,
 205                                    &principal, &logon_info, &ap_rep,
 206                                    &session_key, true);
 207
 208         if (!NT_STATUS_IS_OK(status)) {
 209                 DEBUG(1,("smb2: Failed to verify incoming ticket with error %s!\n",
 210                         nt_errstr(status)));
 211                 if (!NT_STATUS_EQUAL(status, NT_STATUS_TIME_DIFFERENCE_AT_DC)) {
 212                         status = NT_STATUS_LOGON_FAILURE;
 213                 }
 214                 goto fail;
 215         }
 216
 217         status = get_user_from_kerberos_info(talloc_tos(),
 218                                              smb2req->sconn->client_id.name,
 219                                              principal, logon_info,
 220                                              &username_was_mapped,
 221                                              &map_domainuser_to_guest,
 222                                              &user, &domain,
 223                                              &real_username, &pw);
 224         if (!NT_STATUS_IS_OK(status)) {
 225                 goto fail;
 226         }
 227
 228         /* save the PAC data if we have it */
 229         if (logon_info) {
 230                 netsamlogon_cache_store(user, &logon_info->info3);
 231         }
 232
 233         /* setup the string used by %U */
 234         sub_set_smb_name(real_username);
 235
 236         /* reload services so that the new %U is taken into account */
 237         reload_services(smb2req->sconn->msg_ctx, smb2req->sconn->sock, true);
 238
 239         status = make_server_info_krb5(session,
 240                                        user, domain, real_username, pw,
 241                                        logon_info, map_domainuser_to_guest,
 242                                        username_was_mapped,
 243                                        &session->session_info);
 244         if (!NT_STATUS_IS_OK(status)) {
 245                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 246                 goto fail;
 247         }
 248
 249         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 250              lp_server_signing() == Required) {
 251                 session->do_signing = true;
 252         }
 253
 254         if (session->session_info->guest) {
 255                 /* we map anonymous to guest internally */
 256                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 257                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 258                 /* force no signing */
 259                 session->do_signing = false;
 260         }
 261
 262         data_blob_free(&session->session_info->user_session_key);
 263         session->session_info->user_session_key =
 264                         data_blob_talloc(
 265                                 session->session_info,
 266                                 session_key.data,
 267                                 session_key.length);
 268         if (session_key.length > 0) {
 269                 if (session->session_info->user_session_key.data == NULL) {
 270                         status = NT_STATUS_NO_MEMORY;
 271                         goto fail;
 272                 }
 273         }
 274         session->session_key = session->session_info->user_session_key;
 275
 276         session->compat_vuser = talloc_zero(session, user_struct);
 277         if (session->compat_vuser == NULL) {
 278                 status = NT_STATUS_NO_MEMORY;
 279                 goto fail;
 280         }
 281         session->compat_vuser->auth_ntlmssp_state = NULL;
 282         session->compat_vuser->homes_snum = -1;
 283         session->compat_vuser->session_info = session->session_info;
 284         session->compat_vuser->session_keystr = NULL;
 285         session->compat_vuser->vuid = session->vuid;
 286         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 287
 288         /* This is a potentially untrusted username */
 289         alpha_strcpy(tmp, user, ". _-$", sizeof(tmp));
 290         session->session_info->sanitized_username =
 291                                 talloc_strdup(session->session_info, tmp);
 292
 293         if (!session->session_info->guest) {
 294                 session->compat_vuser->homes_snum =
 295                         register_homes_share(session->session_info->unix_name);
 296         }
 297
 298         if (!session_claim(session->sconn, session->compat_vuser)) {
 299                 DEBUG(1, ("smb2: Failed to claim session "
 300                         "for vuid=%d\n",
 301                         session->compat_vuser->vuid));
 302                 goto fail;
 303         }
 304
 305         session->status = NT_STATUS_OK;
 306
 307         /*
 308          * we attach the session to the request
 309          * so that the response can be signed
 310          */
 311         smb2req->session = session;
 312         if (session->do_signing) {
 313                 smb2req->do_signing = true;
 314         }
 315
 316         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 317         status = NT_STATUS_OK;
 318
 319         /* wrap that up in a nice GSS-API wrapping */
 320         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 321                                 TOK_ID_KRB_AP_REP);
 322
 323         secblob_out = spnego_gen_auth_response(
 324                                         talloc_tos(),
 325                                         &ap_rep_wrapped,
 326                                         status,
 327                                         mechOID);
 328
 329         *out_security_buffer = data_blob_talloc(smb2req,
 330                                                 secblob_out.data,
 331                                                 secblob_out.length);
 332         if (secblob_out.data && out_security_buffer->data == NULL) {
 333                 status = NT_STATUS_NO_MEMORY;
 334                 goto fail;
 335         }
 336
 337         data_blob_free(&ap_rep);
 338         data_blob_free(&ap_rep_wrapped);
 339         data_blob_free(&ticket);
 340         data_blob_free(&session_key);
 341         data_blob_free(&secblob_out);
 342
 343         *out_session_id = session->vuid;
 344
 345         return NT_STATUS_OK;
 346
 347   fail:
 348
 349         data_blob_free(&ap_rep);
 350         data_blob_free(&ap_rep_wrapped);
 351         data_blob_free(&ticket);
 352         data_blob_free(&session_key);
 353         data_blob_free(&secblob_out);
 354
 355         ap_rep_wrapped = data_blob_null;
 356         secblob_out = spnego_gen_auth_response(
 357                                         talloc_tos(),
 358                                         &ap_rep_wrapped,
 359                                         status,
 360                                         mechOID);
 361
 362         *out_security_buffer = data_blob_talloc(smb2req,
 363                                                 secblob_out.data,
 364                                                 secblob_out.length);
 365         data_blob_free(&secblob_out);
 366         return status;
 367 }
 368 #endif
 369
 370 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 371                                         struct smbd_smb2_request *smb2req,
 372                                         uint8_t in_security_mode,
 373                                         DATA_BLOB in_security_buffer,
 374                                         uint16_t *out_session_flags,
 375                                         DATA_BLOB *out_security_buffer,
 376                                         uint64_t *out_session_id)
 377 {
 378         DATA_BLOB secblob_in = data_blob_null;
 379         DATA_BLOB chal_out = data_blob_null;
 380         char *kerb_mech = NULL;
 381         NTSTATUS status;
 382
 383         /* Ensure we have no old NTLM state around. */
 384         TALLOC_FREE(session->auth_ntlmssp_state);
 385
 386         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 387                         &secblob_in, &kerb_mech);
 388         if (!NT_STATUS_IS_OK(status)) {
 389                 goto out;
 390         }
 391
 392 #ifdef HAVE_KRB5
 393         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 394                                 USE_KERBEROS_KEYTAB) ) {
 395                 status = smbd_smb2_session_setup_krb5(session,
 396                                 smb2req,
 397                                 in_security_mode,
 398                                 &secblob_in,
 399                                 kerb_mech,
 400                                 out_session_flags,
 401                                 out_security_buffer,
 402                                 out_session_id);
 403
 404                 goto out;
 405         }
 406 #endif
 407
 408         if (kerb_mech) {
 409                 /* The mechtoken is a krb5 ticket, but
 410                  * we need to fall back to NTLM. */
 411
 412                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 413                         "but set to downgrade to NTLMSSP\n"));
 414
 415                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 416         } else {
 417                 /* Fall back to NTLMSSP. */
 418                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 419                 if (!NT_STATUS_IS_OK(status)) {
 420                         goto out;
 421                 }
 422
 423                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 424                                              secblob_in,
 425                                              &chal_out);
 426         }
 427
 428         if (!NT_STATUS_IS_OK(status) &&
 429                         !NT_STATUS_EQUAL(status,
 430                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 431                 goto out;
 432         }
 433
 434         *out_security_buffer = spnego_gen_auth_response(smb2req,
 435                                                 &chal_out,
 436                                                 status,
 437                                                 OID_NTLMSSP);
 438         if (out_security_buffer->data == NULL) {
 439                 status = NT_STATUS_NO_MEMORY;
 440                 goto out;
 441         }
 442         *out_session_id = session->vuid;
 443
 444   out:
 445
 446         data_blob_free(&secblob_in);
 447         data_blob_free(&chal_out);
 448         TALLOC_FREE(kerb_mech);
 449         if (!NT_STATUS_IS_OK(status) &&
 450                         !NT_STATUS_EQUAL(status,
 451                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 452                 TALLOC_FREE(session->auth_ntlmssp_state);
 453                 TALLOC_FREE(session);
 454         }
 455         return status;
 456 }
 457
 458 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 459                                         struct smbd_smb2_request *smb2req,
 460                                         uint8_t in_security_mode,
 461                                         DATA_BLOB in_security_buffer,
 462                                         uint16_t *out_session_flags,
 463                                         uint64_t *out_session_id)
 464 {
 465         fstring tmp;
 466
 467         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 468             lp_server_signing() == Required) {
 469                 session->do_signing = true;
 470         }
 471
 472         if (session->session_info->guest) {
 473                 /* we map anonymous to guest internally */
 474                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 475                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 476                 /* force no signing */
 477                 session->do_signing = false;
 478         }
 479
 480         session->session_key = session->session_info->user_session_key;
 481
 482         session->compat_vuser = talloc_zero(session, user_struct);
 483         if (session->compat_vuser == NULL) {
 484                 TALLOC_FREE(session->auth_ntlmssp_state);
 485                 TALLOC_FREE(session);
 486                 return NT_STATUS_NO_MEMORY;
 487         }
 488         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 489         session->compat_vuser->homes_snum = -1;
 490         session->compat_vuser->session_info = session->session_info;
 491         session->compat_vuser->session_keystr = NULL;
 492         session->compat_vuser->vuid = session->vuid;
 493         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 494
 495         /* This is a potentially untrusted username */
 496         alpha_strcpy(tmp,
 497                      auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 498                      ". _-$",
 499                      sizeof(tmp));
 500         session->session_info->sanitized_username = talloc_strdup(
 501                 session->session_info, tmp);
 502
 503         if (!session->compat_vuser->session_info->guest) {
 504                 session->compat_vuser->homes_snum =
 505                         register_homes_share(session->session_info->unix_name);
 506         }
 507
 508         if (!session_claim(session->sconn, session->compat_vuser)) {
 509                 DEBUG(1, ("smb2: Failed to claim session "
 510                         "for vuid=%d\n",
 511                         session->compat_vuser->vuid));
 512                 TALLOC_FREE(session->auth_ntlmssp_state);
 513                 TALLOC_FREE(session);
 514                 return NT_STATUS_LOGON_FAILURE;
 515         }
 516
 517
 518         session->status = NT_STATUS_OK;
 519
 520         /*
 521          * we attach the session to the request
 522          * so that the response can be signed
 523          */
 524         smb2req->session = session;
 525         if (session->do_signing) {
 526                 smb2req->do_signing = true;
 527         }
 528
 529         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 530
 531         *out_session_id = session->vuid;
 532
 533         return NT_STATUS_OK;
 534 }
 535
 536 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 537                                         struct smbd_smb2_request *smb2req,
 538                                         uint8_t in_security_mode,
 539                                         DATA_BLOB in_security_buffer,
 540                                         uint16_t *out_session_flags,
 541                                         DATA_BLOB *out_security_buffer,
 542                                         uint64_t *out_session_id)
 543 {
 544         DATA_BLOB auth = data_blob_null;
 545         DATA_BLOB auth_out = data_blob_null;
 546         NTSTATUS status;
 547
 548         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 549                 TALLOC_FREE(session);
 550                 return NT_STATUS_LOGON_FAILURE;
 551         }
 552
 553         if (auth.data[0] == ASN1_APPLICATION(0)) {
 554                 /* Might be a second negTokenTarg packet */
 555                 DATA_BLOB secblob_in = data_blob_null;
 556                 char *kerb_mech = NULL;
 557
 558                 status = parse_spnego_mechanisms(talloc_tos(),
 559                                 in_security_buffer,
 560                                 &secblob_in, &kerb_mech);
 561                 if (!NT_STATUS_IS_OK(status)) {
 562                         TALLOC_FREE(session);
 563                         return status;
 564                 }
 565
 566 #ifdef HAVE_KRB5
 567                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 568                                         USE_KERBEROS_KEYTAB) ) {
 569                         status = smbd_smb2_session_setup_krb5(session,
 570                                         smb2req,
 571                                         in_security_mode,
 572                                         &secblob_in,
 573                                         kerb_mech,
 574                                         out_session_flags,
 575                                         out_security_buffer,
 576                                         out_session_id);
 577
 578                         data_blob_free(&secblob_in);
 579                         TALLOC_FREE(kerb_mech);
 580                         if (!NT_STATUS_IS_OK(status)) {
 581                                 TALLOC_FREE(session);
 582                         }
 583                         return status;
 584                 }
 585 #endif
 586
 587                 /* Can't blunder into NTLMSSP auth if we have
 588                  * a krb5 ticket. */
 589
 590                 if (kerb_mech) {
 591                         DEBUG(3,("smb2: network "
 592                                 "misconfiguration, client sent us a "
 593                                 "krb5 ticket and kerberos security "
 594                                 "not enabled\n"));
 595                         TALLOC_FREE(session);
 596                         data_blob_free(&secblob_in);
 597                         TALLOC_FREE(kerb_mech);
 598                         return NT_STATUS_LOGON_FAILURE;
 599                 }
 600
 601                 data_blob_free(&secblob_in);
 602         }
 603
 604         if (session->auth_ntlmssp_state == NULL) {
 605                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 606                 if (!NT_STATUS_IS_OK(status)) {
 607                         data_blob_free(&auth);
 608                         TALLOC_FREE(session);
 609                         return status;
 610                 }
 611         }
 612
 613         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 614                                      auth,
 615                                      &auth_out);
 616         /* We need to call setup_ntlmssp_session_info() if status==NT_STATUS_OK,
 617            or if status is anything except NT_STATUS_MORE_PROCESSING_REQUIRED,
 618            as this can trigger map to guest. */
 619         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 620                 status = setup_ntlmssp_session_info(session, status);
 621         }
 622
 623         if (!NT_STATUS_IS_OK(status) &&
 624                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 625                 TALLOC_FREE(session->auth_ntlmssp_state);
 626                 data_blob_free(&auth);
 627                 TALLOC_FREE(session);
 628                 return status;
 629         }
 630
 631         data_blob_free(&auth);
 632
 633         *out_security_buffer = spnego_gen_auth_response(smb2req,
 634                                 &auth_out, status, NULL);
 635
 636         if (out_security_buffer->data == NULL) {
 637                 TALLOC_FREE(session->auth_ntlmssp_state);
 638                 TALLOC_FREE(session);
 639                 return NT_STATUS_NO_MEMORY;
 640         }
 641
 642         *out_session_id = session->vuid;
 643
 644         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 645                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 646         }
 647
 648         /* We're done - claim the session. */
 649         return smbd_smb2_common_ntlmssp_auth_return(session,
 650                                                 smb2req,
 651                                                 in_security_mode,
 652                                                 in_security_buffer,
 653                                                 out_session_flags,
 654                                                 out_session_id);
 655 }
 656
 657 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 658                                         struct smbd_smb2_request *smb2req,
 659                                         uint8_t in_security_mode,
 660                                         DATA_BLOB in_security_buffer,
 661                                         uint16_t *out_session_flags,
 662                                         DATA_BLOB *out_security_buffer,
 663                                         uint64_t *out_session_id)
 664 {
 665         NTSTATUS status;
 666         DATA_BLOB secblob_out = data_blob_null;
 667
 668         if (session->auth_ntlmssp_state == NULL) {
 669                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 670                 if (!NT_STATUS_IS_OK(status)) {
 671                         TALLOC_FREE(session);
 672                         return status;
 673                 }
 674         }
 675
 676         /* RAW NTLMSSP */
 677         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 678                                      in_security_buffer,
 679                                      &secblob_out);
 680
 681         if (NT_STATUS_IS_OK(status) ||
 682                         NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 683                 *out_security_buffer = data_blob_talloc(smb2req,
 684                                                 secblob_out.data,
 685                                                 secblob_out.length);
 686                 if (secblob_out.data && out_security_buffer->data == NULL) {
 687                         TALLOC_FREE(session->auth_ntlmssp_state);
 688                         TALLOC_FREE(session);
 689                         return NT_STATUS_NO_MEMORY;
 690                 }
 691         }
 692
 693         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 694                 *out_session_id = session->vuid;
 695                 return status;
 696         }
 697
 698         status = setup_ntlmssp_session_info(session, status);
 699
 700         if (!NT_STATUS_IS_OK(status)) {
 701                 TALLOC_FREE(session->auth_ntlmssp_state);
 702                 TALLOC_FREE(session);
 703                 return status;
 704         }
 705         *out_session_id = session->vuid;
 706
 707         return smbd_smb2_common_ntlmssp_auth_return(session,
 708                                                 smb2req,
 709                                                 in_security_mode,
 710                                                 in_security_buffer,
 711                                                 out_session_flags,
 712                                                 out_session_id);
 713 }
 714
 715 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 716                                         uint64_t in_session_id,
 717                                         uint8_t in_security_mode,
 718                                         DATA_BLOB in_security_buffer,
 719                                         uint16_t *out_session_flags,
 720                                         DATA_BLOB *out_security_buffer,
 721                                         uint64_t *out_session_id)
 722 {
 723         struct smbd_smb2_session *session;
 724
 725         *out_session_flags = 0;
 726         *out_session_id = 0;
 727
 728         if (in_session_id == 0) {
 729                 int id;
 730
 731                 /* create a new session */
 732                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 733                 if (session == NULL) {
 734                         return NT_STATUS_NO_MEMORY;
 735                 }
 736                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 737                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 738                                         session,
 739                                         smb2req->sconn->smb2.sessions.limit);
 740                 if (id == -1) {
 741                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 742                 }
 743                 session->vuid = id;
 744
 745                 session->tcons.idtree = idr_init(session);
 746                 if (session->tcons.idtree == NULL) {
 747                         return NT_STATUS_NO_MEMORY;
 748                 }
 749                 session->tcons.limit = 0x0000FFFE;
 750                 session->tcons.list = NULL;
 751
 752                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 753                               struct smbd_smb2_session *);
 754                 session->sconn = smb2req->sconn;
 755                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 756         } else {
 757                 void *p;
 758
 759                 /* lookup an existing session */
 760                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 761                 if (p == NULL) {
 762                         return NT_STATUS_USER_SESSION_DELETED;
 763                 }
 764                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 765         }
 766
 767         if (NT_STATUS_IS_OK(session->status)) {
 768                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 769         }
 770
 771         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 772                 return smbd_smb2_spnego_negotiate(session,
 773                                                 smb2req,
 774                                                 in_security_mode,
 775                                                 in_security_buffer,
 776                                                 out_session_flags,
 777                                                 out_security_buffer,
 778                                                 out_session_id);
 779         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 780                 return smbd_smb2_spnego_auth(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 (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 788                 return smbd_smb2_raw_ntlmssp_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         }
 796
 797         /* Unknown packet type. */
 798         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 799                 (unsigned int)in_security_buffer.data[0] ));
 800         TALLOC_FREE(session->auth_ntlmssp_state);
 801         TALLOC_FREE(session);
 802         return NT_STATUS_LOGON_FAILURE;
 803 }
 804
 805 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 806 {
 807         const uint8_t *inhdr;
 808         const uint8_t *outhdr;
 809         int i = req->current_idx;
 810         uint64_t in_session_id;
 811         void *p;
 812         struct smbd_smb2_session *session;
 813         bool chained_fixup = false;
 814
 815         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 816
 817         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 818
 819         if (in_session_id == (0xFFFFFFFFFFFFFFFFLL)) {
 820                 if (req->async) {
 821                         /*
 822                          * async request - fill in session_id from
 823                          * already setup request out.vector[].iov_base.
 824                          */
 825                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 826                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 827                 } else if (i > 2) {
 828                         /*
 829                          * Chained request - fill in session_id from
 830                          * the previous request out.vector[].iov_base.
 831                          */
 832                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 833                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 834                         chained_fixup = true;
 835                 }
 836         }
 837
 838         /* lookup an existing session */
 839         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 840         if (p == NULL) {
 841                 return NT_STATUS_USER_SESSION_DELETED;
 842         }
 843         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 844
 845         if (!NT_STATUS_IS_OK(session->status)) {
 846                 return NT_STATUS_ACCESS_DENIED;
 847         }
 848
 849         set_current_user_info(session->session_info->sanitized_username,
 850                               session->session_info->unix_name,
 851                               session->session_info->info3->base.domain.string);
 852
 853         req->session = session;
 854
 855         if (chained_fixup) {
 856                 /* Fix up our own outhdr. */
 857                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 858                 SBVAL(outhdr, SMB2_HDR_SESSION_ID, in_session_id);
 859         }
 860         return NT_STATUS_OK;
 861 }
 862
 863 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 864 {
 865         const uint8_t *inbody;
 866         int i = req->current_idx;
 867         DATA_BLOB outbody;
 868         size_t expected_body_size = 0x04;
 869         size_t body_size;
 870
 871         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 872                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 873         }
 874
 875         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 876
 877         body_size = SVAL(inbody, 0x00);
 878         if (body_size != expected_body_size) {
 879                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 880         }
 881
 882         /*
 883          * TODO: cancel all outstanding requests on the session
 884          *       and delete all tree connections.
 885          */
 886         smbd_smb2_session_destructor(req->session);
 887         /*
 888          * we may need to sign the response, so we need to keep
 889          * the session until the response is sent to the wire.
 890          */
 891         talloc_steal(req, req->session);
 892
 893         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 894         if (outbody.data == NULL) {
 895                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 896         }
 897
 898         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 899         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 900
 901         return smbd_smb2_request_done(req, outbody, NULL);
 902 }