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                                         &session->session_info);
 243         if (!NT_STATUS_IS_OK(status)) {
 244                 DEBUG(1, ("smb2: make_server_info_krb5 failed\n"));
 245                 goto fail;
 246         }
 247
 248
 249         session->session_info->nss_token |= username_was_mapped;
 250
 251         /* we need to build the token for the user. make_session_info_guest()
 252            already does this */
 253
 254         if (!session->session_info->security_token ) {
 255                 status = create_local_token(session->session_info);
 256                 if (!NT_STATUS_IS_OK(status)) {
 257                         DEBUG(10,("smb2: failed to create local token: %s\n",
 258                                 nt_errstr(status)));
 259                         goto fail;
 260                 }
 261         }
 262
 263         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 264              lp_server_signing() == Required) {
 265                 session->do_signing = true;
 266         }
 267
 268         if (session->session_info->guest) {
 269                 /* we map anonymous to guest internally */
 270                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 271                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 272                 /* force no signing */
 273                 session->do_signing = false;
 274         }
 275
 276         data_blob_free(&session->session_info->user_session_key);
 277         session->session_info->user_session_key =
 278                         data_blob_talloc(
 279                                 session->session_info,
 280                                 session_key.data,
 281                                 session_key.length);
 282         if (session_key.length > 0) {
 283                 if (session->session_info->user_session_key.data == NULL) {
 284                         status = NT_STATUS_NO_MEMORY;
 285                         goto fail;
 286                 }
 287         }
 288         session->session_key = session->session_info->user_session_key;
 289
 290         session->compat_vuser = talloc_zero(session, user_struct);
 291         if (session->compat_vuser == NULL) {
 292                 status = NT_STATUS_NO_MEMORY;
 293                 goto fail;
 294         }
 295         session->compat_vuser->auth_ntlmssp_state = NULL;
 296         session->compat_vuser->homes_snum = -1;
 297         session->compat_vuser->session_info = session->session_info;
 298         session->compat_vuser->session_keystr = NULL;
 299         session->compat_vuser->vuid = session->vuid;
 300         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 301
 302         /* This is a potentially untrusted username */
 303         alpha_strcpy(tmp, user, ". _-$", sizeof(tmp));
 304         session->session_info->sanitized_username =
 305                                 talloc_strdup(session->session_info, tmp);
 306
 307         if (!session->session_info->guest) {
 308                 session->compat_vuser->homes_snum =
 309                         register_homes_share(session->session_info->unix_name);
 310         }
 311
 312         if (!session_claim(session->sconn, session->compat_vuser)) {
 313                 DEBUG(1, ("smb2: Failed to claim session "
 314                         "for vuid=%d\n",
 315                         session->compat_vuser->vuid));
 316                 goto fail;
 317         }
 318
 319         session->status = NT_STATUS_OK;
 320
 321         /*
 322          * we attach the session to the request
 323          * so that the response can be signed
 324          */
 325         smb2req->session = session;
 326         if (session->do_signing) {
 327                 smb2req->do_signing = true;
 328         }
 329
 330         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 331         status = NT_STATUS_OK;
 332
 333         /* wrap that up in a nice GSS-API wrapping */
 334         ap_rep_wrapped = spnego_gen_krb5_wrap(talloc_tos(), ap_rep,
 335                                 TOK_ID_KRB_AP_REP);
 336
 337         secblob_out = spnego_gen_auth_response(
 338                                         talloc_tos(),
 339                                         &ap_rep_wrapped,
 340                                         status,
 341                                         mechOID);
 342
 343         *out_security_buffer = data_blob_talloc(smb2req,
 344                                                 secblob_out.data,
 345                                                 secblob_out.length);
 346         if (secblob_out.data && out_security_buffer->data == NULL) {
 347                 status = NT_STATUS_NO_MEMORY;
 348                 goto fail;
 349         }
 350
 351         data_blob_free(&ap_rep);
 352         data_blob_free(&ap_rep_wrapped);
 353         data_blob_free(&ticket);
 354         data_blob_free(&session_key);
 355         data_blob_free(&secblob_out);
 356
 357         *out_session_id = session->vuid;
 358
 359         return NT_STATUS_OK;
 360
 361   fail:
 362
 363         data_blob_free(&ap_rep);
 364         data_blob_free(&ap_rep_wrapped);
 365         data_blob_free(&ticket);
 366         data_blob_free(&session_key);
 367         data_blob_free(&secblob_out);
 368
 369         ap_rep_wrapped = data_blob_null;
 370         secblob_out = spnego_gen_auth_response(
 371                                         talloc_tos(),
 372                                         &ap_rep_wrapped,
 373                                         status,
 374                                         mechOID);
 375
 376         *out_security_buffer = data_blob_talloc(smb2req,
 377                                                 secblob_out.data,
 378                                                 secblob_out.length);
 379         data_blob_free(&secblob_out);
 380         return status;
 381 }
 382 #endif
 383
 384 static NTSTATUS smbd_smb2_spnego_negotiate(struct smbd_smb2_session *session,
 385                                         struct smbd_smb2_request *smb2req,
 386                                         uint8_t in_security_mode,
 387                                         DATA_BLOB in_security_buffer,
 388                                         uint16_t *out_session_flags,
 389                                         DATA_BLOB *out_security_buffer,
 390                                         uint64_t *out_session_id)
 391 {
 392         DATA_BLOB secblob_in = data_blob_null;
 393         DATA_BLOB chal_out = data_blob_null;
 394         char *kerb_mech = NULL;
 395         NTSTATUS status;
 396
 397         /* Ensure we have no old NTLM state around. */
 398         TALLOC_FREE(session->auth_ntlmssp_state);
 399
 400         status = parse_spnego_mechanisms(talloc_tos(), in_security_buffer,
 401                         &secblob_in, &kerb_mech);
 402         if (!NT_STATUS_IS_OK(status)) {
 403                 goto out;
 404         }
 405
 406 #ifdef HAVE_KRB5
 407         if (kerb_mech && ((lp_security()==SEC_ADS) ||
 408                                 USE_KERBEROS_KEYTAB) ) {
 409                 status = smbd_smb2_session_setup_krb5(session,
 410                                 smb2req,
 411                                 in_security_mode,
 412                                 &secblob_in,
 413                                 kerb_mech,
 414                                 out_session_flags,
 415                                 out_security_buffer,
 416                                 out_session_id);
 417
 418                 goto out;
 419         }
 420 #endif
 421
 422         if (kerb_mech) {
 423                 /* The mechtoken is a krb5 ticket, but
 424                  * we need to fall back to NTLM. */
 425
 426                 DEBUG(3,("smb2: Got krb5 ticket in SPNEGO "
 427                         "but set to downgrade to NTLMSSP\n"));
 428
 429                 status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 430         } else {
 431                 /* Fall back to NTLMSSP. */
 432                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 433                 if (!NT_STATUS_IS_OK(status)) {
 434                         goto out;
 435                 }
 436
 437                 status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 438                                              secblob_in,
 439                                              &chal_out);
 440         }
 441
 442         if (!NT_STATUS_IS_OK(status) &&
 443                         !NT_STATUS_EQUAL(status,
 444                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 445                 goto out;
 446         }
 447
 448         *out_security_buffer = spnego_gen_auth_response(smb2req,
 449                                                 &chal_out,
 450                                                 status,
 451                                                 OID_NTLMSSP);
 452         if (out_security_buffer->data == NULL) {
 453                 status = NT_STATUS_NO_MEMORY;
 454                 goto out;
 455         }
 456         *out_session_id = session->vuid;
 457
 458   out:
 459
 460         data_blob_free(&secblob_in);
 461         data_blob_free(&chal_out);
 462         TALLOC_FREE(kerb_mech);
 463         if (!NT_STATUS_IS_OK(status) &&
 464                         !NT_STATUS_EQUAL(status,
 465                                 NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 466                 TALLOC_FREE(session->auth_ntlmssp_state);
 467                 TALLOC_FREE(session);
 468         }
 469         return status;
 470 }
 471
 472 static NTSTATUS smbd_smb2_common_ntlmssp_auth_return(struct smbd_smb2_session *session,
 473                                         struct smbd_smb2_request *smb2req,
 474                                         uint8_t in_security_mode,
 475                                         DATA_BLOB in_security_buffer,
 476                                         uint16_t *out_session_flags,
 477                                         uint64_t *out_session_id)
 478 {
 479         fstring tmp;
 480
 481         if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
 482             lp_server_signing() == Required) {
 483                 session->do_signing = true;
 484         }
 485
 486         if (session->session_info->guest) {
 487                 /* we map anonymous to guest internally */
 488                 *out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
 489                 *out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
 490                 /* force no signing */
 491                 session->do_signing = false;
 492         }
 493
 494         session->session_key = session->session_info->user_session_key;
 495
 496         session->compat_vuser = talloc_zero(session, user_struct);
 497         if (session->compat_vuser == NULL) {
 498                 TALLOC_FREE(session->auth_ntlmssp_state);
 499                 TALLOC_FREE(session);
 500                 return NT_STATUS_NO_MEMORY;
 501         }
 502         session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
 503         session->compat_vuser->homes_snum = -1;
 504         session->compat_vuser->session_info = session->session_info;
 505         session->compat_vuser->session_keystr = NULL;
 506         session->compat_vuser->vuid = session->vuid;
 507         DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
 508
 509         /* This is a potentially untrusted username */
 510         alpha_strcpy(tmp,
 511                      auth_ntlmssp_get_username(session->auth_ntlmssp_state),
 512                      ". _-$",
 513                      sizeof(tmp));
 514         session->session_info->sanitized_username = talloc_strdup(
 515                 session->session_info, tmp);
 516
 517         if (!session->compat_vuser->session_info->guest) {
 518                 session->compat_vuser->homes_snum =
 519                         register_homes_share(session->session_info->unix_name);
 520         }
 521
 522         if (!session_claim(session->sconn, session->compat_vuser)) {
 523                 DEBUG(1, ("smb2: Failed to claim session "
 524                         "for vuid=%d\n",
 525                         session->compat_vuser->vuid));
 526                 TALLOC_FREE(session->auth_ntlmssp_state);
 527                 TALLOC_FREE(session);
 528                 return NT_STATUS_LOGON_FAILURE;
 529         }
 530
 531
 532         session->status = NT_STATUS_OK;
 533
 534         /*
 535          * we attach the session to the request
 536          * so that the response can be signed
 537          */
 538         smb2req->session = session;
 539         if (session->do_signing) {
 540                 smb2req->do_signing = true;
 541         }
 542
 543         global_client_caps |= (CAP_LEVEL_II_OPLOCKS|CAP_STATUS32);
 544
 545         *out_session_id = session->vuid;
 546
 547         return NT_STATUS_OK;
 548 }
 549
 550 static NTSTATUS smbd_smb2_spnego_auth(struct smbd_smb2_session *session,
 551                                         struct smbd_smb2_request *smb2req,
 552                                         uint8_t in_security_mode,
 553                                         DATA_BLOB in_security_buffer,
 554                                         uint16_t *out_session_flags,
 555                                         DATA_BLOB *out_security_buffer,
 556                                         uint64_t *out_session_id)
 557 {
 558         DATA_BLOB auth = data_blob_null;
 559         DATA_BLOB auth_out = data_blob_null;
 560         NTSTATUS status;
 561
 562         if (!spnego_parse_auth(talloc_tos(), in_security_buffer, &auth)) {
 563                 TALLOC_FREE(session);
 564                 return NT_STATUS_LOGON_FAILURE;
 565         }
 566
 567         if (auth.data[0] == ASN1_APPLICATION(0)) {
 568                 /* Might be a second negTokenTarg packet */
 569                 DATA_BLOB secblob_in = data_blob_null;
 570                 char *kerb_mech = NULL;
 571
 572                 status = parse_spnego_mechanisms(talloc_tos(),
 573                                 in_security_buffer,
 574                                 &secblob_in, &kerb_mech);
 575                 if (!NT_STATUS_IS_OK(status)) {
 576                         TALLOC_FREE(session);
 577                         return status;
 578                 }
 579
 580 #ifdef HAVE_KRB5
 581                 if (kerb_mech && ((lp_security()==SEC_ADS) ||
 582                                         USE_KERBEROS_KEYTAB) ) {
 583                         status = smbd_smb2_session_setup_krb5(session,
 584                                         smb2req,
 585                                         in_security_mode,
 586                                         &secblob_in,
 587                                         kerb_mech,
 588                                         out_session_flags,
 589                                         out_security_buffer,
 590                                         out_session_id);
 591
 592                         data_blob_free(&secblob_in);
 593                         TALLOC_FREE(kerb_mech);
 594                         if (!NT_STATUS_IS_OK(status)) {
 595                                 TALLOC_FREE(session);
 596                         }
 597                         return status;
 598                 }
 599 #endif
 600
 601                 /* Can't blunder into NTLMSSP auth if we have
 602                  * a krb5 ticket. */
 603
 604                 if (kerb_mech) {
 605                         DEBUG(3,("smb2: network "
 606                                 "misconfiguration, client sent us a "
 607                                 "krb5 ticket and kerberos security "
 608                                 "not enabled\n"));
 609                         TALLOC_FREE(session);
 610                         data_blob_free(&secblob_in);
 611                         TALLOC_FREE(kerb_mech);
 612                         return NT_STATUS_LOGON_FAILURE;
 613                 }
 614
 615                 data_blob_free(&secblob_in);
 616         }
 617
 618         if (session->auth_ntlmssp_state == NULL) {
 619                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 620                 if (!NT_STATUS_IS_OK(status)) {
 621                         data_blob_free(&auth);
 622                         TALLOC_FREE(session);
 623                         return status;
 624                 }
 625         }
 626
 627         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 628                                      auth,
 629                                      &auth_out);
 630         /* We need to call setup_ntlmssp_session_info() if status==NT_STATUS_OK,
 631            or if status is anything except NT_STATUS_MORE_PROCESSING_REQUIRED,
 632            as this can trigger map to guest. */
 633         if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 634                 status = setup_ntlmssp_session_info(session, status);
 635         }
 636
 637         if (!NT_STATUS_IS_OK(status) &&
 638                         !NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 639                 TALLOC_FREE(session->auth_ntlmssp_state);
 640                 data_blob_free(&auth);
 641                 TALLOC_FREE(session);
 642                 return status;
 643         }
 644
 645         data_blob_free(&auth);
 646
 647         *out_security_buffer = spnego_gen_auth_response(smb2req,
 648                                 &auth_out, status, NULL);
 649
 650         if (out_security_buffer->data == NULL) {
 651                 TALLOC_FREE(session->auth_ntlmssp_state);
 652                 TALLOC_FREE(session);
 653                 return NT_STATUS_NO_MEMORY;
 654         }
 655
 656         *out_session_id = session->vuid;
 657
 658         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 659                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
 660         }
 661
 662         /* We're done - claim the session. */
 663         return smbd_smb2_common_ntlmssp_auth_return(session,
 664                                                 smb2req,
 665                                                 in_security_mode,
 666                                                 in_security_buffer,
 667                                                 out_session_flags,
 668                                                 out_session_id);
 669 }
 670
 671 static NTSTATUS smbd_smb2_raw_ntlmssp_auth(struct smbd_smb2_session *session,
 672                                         struct smbd_smb2_request *smb2req,
 673                                         uint8_t in_security_mode,
 674                                         DATA_BLOB in_security_buffer,
 675                                         uint16_t *out_session_flags,
 676                                         DATA_BLOB *out_security_buffer,
 677                                         uint64_t *out_session_id)
 678 {
 679         NTSTATUS status;
 680         DATA_BLOB secblob_out = data_blob_null;
 681
 682         if (session->auth_ntlmssp_state == NULL) {
 683                 status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
 684                 if (!NT_STATUS_IS_OK(status)) {
 685                         TALLOC_FREE(session);
 686                         return status;
 687                 }
 688         }
 689
 690         /* RAW NTLMSSP */
 691         status = auth_ntlmssp_update(session->auth_ntlmssp_state,
 692                                      in_security_buffer,
 693                                      &secblob_out);
 694
 695         if (NT_STATUS_IS_OK(status) ||
 696                         NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 697                 *out_security_buffer = data_blob_talloc(smb2req,
 698                                                 secblob_out.data,
 699                                                 secblob_out.length);
 700                 if (secblob_out.data && out_security_buffer->data == NULL) {
 701                         TALLOC_FREE(session->auth_ntlmssp_state);
 702                         TALLOC_FREE(session);
 703                         return NT_STATUS_NO_MEMORY;
 704                 }
 705         }
 706
 707         if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 708                 *out_session_id = session->vuid;
 709                 return status;
 710         }
 711
 712         status = setup_ntlmssp_session_info(session, status);
 713
 714         if (!NT_STATUS_IS_OK(status)) {
 715                 TALLOC_FREE(session->auth_ntlmssp_state);
 716                 TALLOC_FREE(session);
 717                 return status;
 718         }
 719         *out_session_id = session->vuid;
 720
 721         return smbd_smb2_common_ntlmssp_auth_return(session,
 722                                                 smb2req,
 723                                                 in_security_mode,
 724                                                 in_security_buffer,
 725                                                 out_session_flags,
 726                                                 out_session_id);
 727 }
 728
 729 static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *smb2req,
 730                                         uint64_t in_session_id,
 731                                         uint8_t in_security_mode,
 732                                         DATA_BLOB in_security_buffer,
 733                                         uint16_t *out_session_flags,
 734                                         DATA_BLOB *out_security_buffer,
 735                                         uint64_t *out_session_id)
 736 {
 737         struct smbd_smb2_session *session;
 738
 739         *out_session_flags = 0;
 740         *out_session_id = 0;
 741
 742         if (in_session_id == 0) {
 743                 int id;
 744
 745                 /* create a new session */
 746                 session = talloc_zero(smb2req->sconn, struct smbd_smb2_session);
 747                 if (session == NULL) {
 748                         return NT_STATUS_NO_MEMORY;
 749                 }
 750                 session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
 751                 id = idr_get_new_random(smb2req->sconn->smb2.sessions.idtree,
 752                                         session,
 753                                         smb2req->sconn->smb2.sessions.limit);
 754                 if (id == -1) {
 755                         return NT_STATUS_INSUFFICIENT_RESOURCES;
 756                 }
 757                 session->vuid = id;
 758
 759                 session->tcons.idtree = idr_init(session);
 760                 if (session->tcons.idtree == NULL) {
 761                         return NT_STATUS_NO_MEMORY;
 762                 }
 763                 session->tcons.limit = 0x0000FFFE;
 764                 session->tcons.list = NULL;
 765
 766                 DLIST_ADD_END(smb2req->sconn->smb2.sessions.list, session,
 767                               struct smbd_smb2_session *);
 768                 session->sconn = smb2req->sconn;
 769                 talloc_set_destructor(session, smbd_smb2_session_destructor);
 770         } else {
 771                 void *p;
 772
 773                 /* lookup an existing session */
 774                 p = idr_find(smb2req->sconn->smb2.sessions.idtree, in_session_id);
 775                 if (p == NULL) {
 776                         return NT_STATUS_USER_SESSION_DELETED;
 777                 }
 778                 session = talloc_get_type_abort(p, struct smbd_smb2_session);
 779         }
 780
 781         if (NT_STATUS_IS_OK(session->status)) {
 782                 return NT_STATUS_REQUEST_NOT_ACCEPTED;
 783         }
 784
 785         if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
 786                 return smbd_smb2_spnego_negotiate(session,
 787                                                 smb2req,
 788                                                 in_security_mode,
 789                                                 in_security_buffer,
 790                                                 out_session_flags,
 791                                                 out_security_buffer,
 792                                                 out_session_id);
 793         } else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
 794                 return smbd_smb2_spnego_auth(session,
 795                                                 smb2req,
 796                                                 in_security_mode,
 797                                                 in_security_buffer,
 798                                                 out_session_flags,
 799                                                 out_security_buffer,
 800                                                 out_session_id);
 801         } else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
 802                 return smbd_smb2_raw_ntlmssp_auth(session,
 803                                                 smb2req,
 804                                                 in_security_mode,
 805                                                 in_security_buffer,
 806                                                 out_session_flags,
 807                                                 out_security_buffer,
 808                                                 out_session_id);
 809         }
 810
 811         /* Unknown packet type. */
 812         DEBUG(1,("Unknown packet type %u in smb2 sessionsetup\n",
 813                 (unsigned int)in_security_buffer.data[0] ));
 814         TALLOC_FREE(session->auth_ntlmssp_state);
 815         TALLOC_FREE(session);
 816         return NT_STATUS_LOGON_FAILURE;
 817 }
 818
 819 NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
 820 {
 821         const uint8_t *inhdr;
 822         const uint8_t *outhdr;
 823         int i = req->current_idx;
 824         uint64_t in_session_id;
 825         void *p;
 826         struct smbd_smb2_session *session;
 827         bool chained_fixup = false;
 828
 829         inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
 830
 831         in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
 832
 833         if (in_session_id == (0xFFFFFFFFFFFFFFFFLL)) {
 834                 if (req->async) {
 835                         /*
 836                          * async request - fill in session_id from
 837                          * already setup request out.vector[].iov_base.
 838                          */
 839                         outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 840                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 841                 } else if (i > 2) {
 842                         /*
 843                          * Chained request - fill in session_id from
 844                          * the previous request out.vector[].iov_base.
 845                          */
 846                         outhdr = (const uint8_t *)req->out.vector[i-3].iov_base;
 847                         in_session_id = BVAL(outhdr, SMB2_HDR_SESSION_ID);
 848                         chained_fixup = true;
 849                 }
 850         }
 851
 852         /* lookup an existing session */
 853         p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
 854         if (p == NULL) {
 855                 return NT_STATUS_USER_SESSION_DELETED;
 856         }
 857         session = talloc_get_type_abort(p, struct smbd_smb2_session);
 858
 859         if (!NT_STATUS_IS_OK(session->status)) {
 860                 return NT_STATUS_ACCESS_DENIED;
 861         }
 862
 863         set_current_user_info(session->session_info->sanitized_username,
 864                               session->session_info->unix_name,
 865                               session->session_info->info3->base.domain.string);
 866
 867         req->session = session;
 868
 869         if (chained_fixup) {
 870                 /* Fix up our own outhdr. */
 871                 outhdr = (const uint8_t *)req->out.vector[i].iov_base;
 872                 SBVAL(outhdr, SMB2_HDR_SESSION_ID, in_session_id);
 873         }
 874         return NT_STATUS_OK;
 875 }
 876
 877 NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
 878 {
 879         const uint8_t *inbody;
 880         int i = req->current_idx;
 881         DATA_BLOB outbody;
 882         size_t expected_body_size = 0x04;
 883         size_t body_size;
 884
 885         if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
 886                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 887         }
 888
 889         inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
 890
 891         body_size = SVAL(inbody, 0x00);
 892         if (body_size != expected_body_size) {
 893                 return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
 894         }
 895
 896         /*
 897          * TODO: cancel all outstanding requests on the session
 898          *       and delete all tree connections.
 899          */
 900         smbd_smb2_session_destructor(req->session);
 901         /*
 902          * we may need to sign the response, so we need to keep
 903          * the session until the response is sent to the wire.
 904          */
 905         talloc_steal(req, req->session);
 906
 907         outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
 908         if (outbody.data == NULL) {
 909                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
 910         }
 911
 912         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
 913         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 914
 915         return smbd_smb2_request_done(req, outbody, NULL);
 916 }