source4/rpc_server/dcesrv_auth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    server side dcerpc authentication code
   5
   6    Copyright (C) Andrew Tridgell 2003
   7    Copyright (C) Stefan (metze) Metzmacher 2004
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "rpc_server/dcerpc_server.h"
  25 #include "rpc_server/dcerpc_server_proto.h"
  26 #include "rpc_server/common/proto.h"
  27 #include "librpc/rpc/dcerpc_proto.h"
  28 #include "librpc/gen_ndr/ndr_dcerpc.h"
  29 #include "auth/credentials/credentials.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/auth.h"
  32 #include "param/param.h"
  33 #include "librpc/rpc/rpc_common.h"
  34
  35 /*
  36   parse any auth information from a dcerpc bind request
  37   return false if we can't handle the auth request for some
  38   reason (in which case we send a bind_nak)
  39 */
  40 bool dcesrv_auth_bind(struct dcesrv_call_state *call)
  41 {
  42         struct cli_credentials *server_credentials = NULL;
  43         struct ncacn_packet *pkt = &call->pkt;
  44         struct dcesrv_connection *dce_conn = call->conn;
  45         struct dcesrv_auth *auth = &dce_conn->auth_state;
  46         NTSTATUS status;
  47         uint32_t auth_length;
  48
  49         if (pkt->auth_length == 0) {
  50                 auth->auth_type = DCERPC_AUTH_TYPE_NONE;
  51                 auth->auth_level = DCERPC_AUTH_LEVEL_NONE;
  52                 auth->auth_context_id = 0;
  53                 return true;
  54         }
  55
  56         status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.bind.auth_info,
  57                                           &call->in_auth_info,
  58                                           &auth_length, false);
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 return false;
  61         }
  62
  63         auth->auth_type = call->in_auth_info.auth_type;
  64         auth->auth_level = call->in_auth_info.auth_level;
  65         auth->auth_context_id = call->in_auth_info.auth_context_id;
  66
  67         server_credentials
  68                 = cli_credentials_init(call);
  69         if (!server_credentials) {
  70                 DEBUG(1, ("Failed to init server credentials\n"));
  71                 return false;
  72         }
  73
  74         cli_credentials_set_conf(server_credentials, call->conn->dce_ctx->lp_ctx);
  75         status = cli_credentials_set_machine_account(server_credentials, call->conn->dce_ctx->lp_ctx);
  76         if (!NT_STATUS_IS_OK(status)) {
  77                 DEBUG(1, ("Failed to obtain server credentials: %s\n",
  78                           nt_errstr(status)));
  79                 return false;
  80         }
  81
  82         status = samba_server_gensec_start(dce_conn, call->event_ctx,
  83                                            call->msg_ctx,
  84                                            call->conn->dce_ctx->lp_ctx,
  85                                            server_credentials,
  86                                            NULL,
  87                                            &auth->gensec_security);
  88         if (!NT_STATUS_IS_OK(status)) {
  89                 DEBUG(1, ("Failed to call samba_server_gensec_start %s\n",
  90                           nt_errstr(status)));
  91                 return false;
  92         }
  93
  94         if (call->conn->remote_address != NULL) {
  95                 status = gensec_set_remote_address(auth->gensec_security,
  96                                                 call->conn->remote_address);
  97                 if (!NT_STATUS_IS_OK(status)) {
  98                         DEBUG(1, ("Failed to call gensec_set_remote_address() %s\n",
  99                                   nt_errstr(status)));
 100                         return false;
 101                 }
 102         }
 103
 104         status = gensec_start_mech_by_authtype(auth->gensec_security, auth->auth_type,
 105                                                auth->auth_level);
 106         if (!NT_STATUS_IS_OK(status)) {
 107                 DEBUG(3, ("Failed to start GENSEC mechanism for DCERPC server: auth_type=%d, auth_level=%d: %s\n",
 108                           (int)auth->auth_type,
 109                           (int)auth->auth_level,
 110                           nt_errstr(status)));
 111                 return false;
 112         }
 113
 114         return true;
 115 }
 116
 117 /*
 118   add any auth information needed in a bind ack, and process the authentication
 119   information found in the bind.
 120 */
 121 NTSTATUS dcesrv_auth_bind_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
 122 {
 123         struct dcesrv_connection *dce_conn = call->conn;
 124         NTSTATUS status;
 125         bool want_header_signing = false;
 126
 127         dce_conn->allow_alter = true;
 128         dce_conn->allow_auth3 = true;
 129
 130         if (call->pkt.auth_length == 0) {
 131                 dce_conn->auth_state.auth_finished = true;
 132                 dce_conn->allow_request = true;
 133                 return NT_STATUS_OK;
 134         }
 135
 136         /* We can't work without an existing gensec state */
 137         if (!call->conn->auth_state.gensec_security) {
 138                 return NT_STATUS_INTERNAL_ERROR;
 139         }
 140
 141         if (call->pkt.pfc_flags & DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN) {
 142                 dce_conn->auth_state.client_hdr_signing = true;
 143                 want_header_signing = true;
 144         }
 145
 146         if (!lpcfg_parm_bool(call->conn->dce_ctx->lp_ctx, NULL, "dcesrv","header signing", true)) {
 147                 want_header_signing = false;
 148         }
 149
 150         call->_out_auth_info = (struct dcerpc_auth) {
 151                 .auth_type = dce_conn->auth_state.auth_type,
 152                 .auth_level = dce_conn->auth_state.auth_level,
 153                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 154         };
 155         call->out_auth_info = &call->_out_auth_info;
 156
 157         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 158                                call, call->event_ctx,
 159                                call->in_auth_info.credentials,
 160                                &call->out_auth_info->credentials);
 161
 162         if (NT_STATUS_IS_OK(status)) {
 163                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 164                                              dce_conn,
 165                                              &dce_conn->auth_state.session_info);
 166                 if (!NT_STATUS_IS_OK(status)) {
 167                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 168                         return status;
 169                 }
 170                 dce_conn->auth_state.auth_finished = true;
 171                 dce_conn->allow_request = true;
 172
 173                 if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
 174                                          GENSEC_FEATURE_SIGN_PKT_HEADER))
 175                 {
 176                         want_header_signing = false;
 177                 }
 178
 179                 if (want_header_signing) {
 180                         gensec_want_feature(dce_conn->auth_state.gensec_security,
 181                                             GENSEC_FEATURE_SIGN_PKT_HEADER);
 182                         dce_conn->auth_state.hdr_signing = true;
 183                         pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
 184                 }
 185
 186                 /* Now that we are authenticated, go back to the generic session key... */
 187                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 188                 return NT_STATUS_OK;
 189         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 190                 if (!gensec_have_feature(dce_conn->auth_state.gensec_security,
 191                                          GENSEC_FEATURE_SIGN_PKT_HEADER))
 192                 {
 193                         want_header_signing = false;
 194                 }
 195
 196                 if (want_header_signing) {
 197                         gensec_want_feature(dce_conn->auth_state.gensec_security,
 198                                             GENSEC_FEATURE_SIGN_PKT_HEADER);
 199                         dce_conn->auth_state.hdr_signing = true;
 200                         pkt->pfc_flags |= DCERPC_PFC_FLAG_SUPPORT_HEADER_SIGN;
 201                 }
 202
 203                 return NT_STATUS_OK;
 204         } else {
 205                 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_ack: %s\n",
 206                           nt_errstr(status)));
 207                 return status;
 208         }
 209 }
 210
 211
 212 /*
 213   process the final stage of a auth request
 214 */
 215 bool dcesrv_auth_auth3(struct dcesrv_call_state *call)
 216 {
 217         struct ncacn_packet *pkt = &call->pkt;
 218         struct dcesrv_connection *dce_conn = call->conn;
 219         NTSTATUS status;
 220         uint32_t auth_length;
 221
 222         if (pkt->auth_length == 0) {
 223                 return false;
 224         }
 225
 226         if (dce_conn->auth_state.auth_finished) {
 227                 return false;
 228         }
 229
 230         /* We can't work without an existing gensec state */
 231         if (!dce_conn->auth_state.gensec_security) {
 232                 return false;
 233         }
 234
 235         status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.auth3.auth_info,
 236                                           &call->in_auth_info, &auth_length, true);
 237         if (!NT_STATUS_IS_OK(status)) {
 238                 return false;
 239         }
 240
 241         call->_out_auth_info = (struct dcerpc_auth) {
 242                 .auth_type = dce_conn->auth_state.auth_type,
 243                 .auth_level = dce_conn->auth_state.auth_level,
 244                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 245         };
 246         call->out_auth_info = &call->_out_auth_info;
 247
 248         /* Pass the extra data we got from the client down to gensec for processing */
 249         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 250                                call, call->event_ctx,
 251                                call->in_auth_info.credentials,
 252                                &call->out_auth_info->credentials);
 253         if (NT_STATUS_IS_OK(status)) {
 254                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 255                                              dce_conn,
 256                                              &dce_conn->auth_state.session_info);
 257                 if (!NT_STATUS_IS_OK(status)) {
 258                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 259                         return false;
 260                 }
 261                 dce_conn->auth_state.auth_finished = true;
 262                 dce_conn->allow_request = true;
 263
 264                 /* Now that we are authenticated, go back to the generic session key... */
 265                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 266                 return true;
 267         } else {
 268                 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
 269                           nt_errstr(status)));
 270                 return false;
 271         }
 272 }
 273
 274 /*
 275   parse any auth information from a dcerpc alter request
 276   return false if we can't handle the auth request for some
 277   reason (in which case we send a bind_nak (is this true for here?))
 278 */
 279 bool dcesrv_auth_alter(struct dcesrv_call_state *call)
 280 {
 281         struct ncacn_packet *pkt = &call->pkt;
 282         struct dcesrv_connection *dce_conn = call->conn;
 283         NTSTATUS status;
 284         uint32_t auth_length;
 285
 286         /* on a pure interface change there is no auth blob */
 287         if (pkt->auth_length == 0) {
 288                 if (!dce_conn->auth_state.auth_finished) {
 289                         return false;
 290                 }
 291                 return true;
 292         }
 293
 294         if (dce_conn->auth_state.auth_finished) {
 295                 return false;
 296         }
 297
 298         /* We can't work without an existing gensec state */
 299         if (!dce_conn->auth_state.gensec_security) {
 300                 return false;
 301         }
 302
 303         status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
 304                                           &call->in_auth_info, &auth_length, true);
 305         if (!NT_STATUS_IS_OK(status)) {
 306                 return false;
 307         }
 308
 309         return true;
 310 }
 311
 312 /*
 313   add any auth information needed in a alter ack, and process the authentication
 314   information found in the alter.
 315 */
 316 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
 317 {
 318         struct dcesrv_connection *dce_conn = call->conn;
 319         NTSTATUS status;
 320
 321         /* on a pure interface change there is no auth_info structure
 322            setup */
 323         if (call->pkt.auth_length == 0) {
 324                 return NT_STATUS_OK;
 325         }
 326
 327         if (!call->conn->auth_state.gensec_security) {
 328                 return NT_STATUS_INTERNAL_ERROR;
 329         }
 330
 331         call->_out_auth_info = (struct dcerpc_auth) {
 332                 .auth_type = dce_conn->auth_state.auth_type,
 333                 .auth_level = dce_conn->auth_state.auth_level,
 334                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 335         };
 336         call->out_auth_info = &call->_out_auth_info;
 337
 338         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 339                                call, call->event_ctx,
 340                                call->in_auth_info.credentials,
 341                                &call->out_auth_info->credentials);
 342
 343         if (NT_STATUS_IS_OK(status)) {
 344                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 345                                              dce_conn,
 346                                              &dce_conn->auth_state.session_info);
 347                 if (!NT_STATUS_IS_OK(status)) {
 348                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 349                         return status;
 350                 }
 351                 dce_conn->auth_state.auth_finished = true;
 352                 dce_conn->allow_request = true;
 353
 354                 /* Now that we are authenticated, got back to the generic session key... */
 355                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 356                 return NT_STATUS_OK;
 357         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 358                 return NT_STATUS_OK;
 359         }
 360
 361         DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
 362                   nt_errstr(status)));
 363         return status;
 364 }
 365
 366 /*
 367   check credentials on a request
 368 */
 369 bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
 370 {
 371         struct ncacn_packet *pkt = &call->pkt;
 372         struct dcesrv_connection *dce_conn = call->conn;
 373         NTSTATUS status;
 374         uint32_t auth_length;
 375         size_t hdr_size = DCERPC_REQUEST_LENGTH;
 376
 377         if (!dce_conn->allow_request) {
 378                 return false;
 379         }
 380
 381         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
 382                 hdr_size += 16;
 383         }
 384
 385         switch (dce_conn->auth_state.auth_level) {
 386         case DCERPC_AUTH_LEVEL_PRIVACY:
 387         case DCERPC_AUTH_LEVEL_INTEGRITY:
 388                 break;
 389
 390         case DCERPC_AUTH_LEVEL_CONNECT:
 391                 if (pkt->auth_length != 0) {
 392                         break;
 393                 }
 394                 return true;
 395         case DCERPC_AUTH_LEVEL_NONE:
 396                 if (pkt->auth_length != 0) {
 397                         return false;
 398                 }
 399                 return true;
 400
 401         default:
 402                 return false;
 403         }
 404
 405         if (!dce_conn->auth_state.gensec_security) {
 406                 return false;
 407         }
 408
 409         status = dcerpc_pull_auth_trailer(pkt, call,
 410                                           &pkt->u.request.stub_and_verifier,
 411                                           &call->in_auth_info, &auth_length, false);
 412         if (!NT_STATUS_IS_OK(status)) {
 413                 return false;
 414         }
 415
 416         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 417                 return false;
 418         }
 419
 420         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 421                 return false;
 422         }
 423
 424         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 425                 return false;
 426         }
 427
 428         pkt->u.request.stub_and_verifier.length -= auth_length;
 429
 430         /* check signature or unseal the packet */
 431         switch (dce_conn->auth_state.auth_level) {
 432         case DCERPC_AUTH_LEVEL_PRIVACY:
 433                 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
 434                                               full_packet->data + hdr_size,
 435                                               pkt->u.request.stub_and_verifier.length,
 436                                               full_packet->data,
 437                                               full_packet->length-
 438                                               call->in_auth_info.credentials.length,
 439                                               &call->in_auth_info.credentials);
 440                 memcpy(pkt->u.request.stub_and_verifier.data,
 441                        full_packet->data + hdr_size,
 442                        pkt->u.request.stub_and_verifier.length);
 443                 break;
 444
 445         case DCERPC_AUTH_LEVEL_INTEGRITY:
 446                 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
 447                                              pkt->u.request.stub_and_verifier.data,
 448                                              pkt->u.request.stub_and_verifier.length,
 449                                              full_packet->data,
 450                                              full_packet->length-
 451                                              call->in_auth_info.credentials.length,
 452                                              &call->in_auth_info.credentials);
 453                 break;
 454
 455         case DCERPC_AUTH_LEVEL_CONNECT:
 456                 /* for now we ignore possible signatures here */
 457                 status = NT_STATUS_OK;
 458                 break;
 459
 460         default:
 461                 status = NT_STATUS_INVALID_LEVEL;
 462                 break;
 463         }
 464
 465         /* remove the indicated amount of padding */
 466         if (pkt->u.request.stub_and_verifier.length < call->in_auth_info.auth_pad_length) {
 467                 return false;
 468         }
 469         pkt->u.request.stub_and_verifier.length -= call->in_auth_info.auth_pad_length;
 470
 471         return NT_STATUS_IS_OK(status);
 472 }
 473
 474
 475 /*
 476    push a signed or sealed dcerpc request packet into a blob
 477 */
 478 bool dcesrv_auth_response(struct dcesrv_call_state *call,
 479                           DATA_BLOB *blob, size_t sig_size,
 480                           struct ncacn_packet *pkt)
 481 {
 482         struct dcesrv_connection *dce_conn = call->conn;
 483         NTSTATUS status;
 484         enum ndr_err_code ndr_err;
 485         struct ndr_push *ndr;
 486         uint32_t payload_length;
 487         DATA_BLOB creds2;
 488
 489         switch (dce_conn->auth_state.auth_level) {
 490         case DCERPC_AUTH_LEVEL_PRIVACY:
 491         case DCERPC_AUTH_LEVEL_INTEGRITY:
 492                 if (sig_size == 0) {
 493                         return false;
 494                 }
 495
 496                 break;
 497
 498         case DCERPC_AUTH_LEVEL_CONNECT:
 499                 /*
 500                  * TODO: let the gensec mech decide if it wants to generate a
 501                  *       signature that might be needed for schannel...
 502                  */
 503                 status = ncacn_push_auth(blob, call, pkt, NULL);
 504                 return NT_STATUS_IS_OK(status);
 505
 506         case DCERPC_AUTH_LEVEL_NONE:
 507                 status = ncacn_push_auth(blob, call, pkt, NULL);
 508                 return NT_STATUS_IS_OK(status);
 509
 510         default:
 511                 return false;
 512         }
 513
 514         if (!dce_conn->auth_state.gensec_security) {
 515                 return false;
 516         }
 517
 518         ndr = ndr_push_init_ctx(call);
 519         if (!ndr) {
 520                 return false;
 521         }
 522
 523         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 524                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 525         }
 526
 527         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
 528         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 529                 return false;
 530         }
 531
 532         call->_out_auth_info = (struct dcerpc_auth) {
 533                 .auth_type = dce_conn->auth_state.auth_type,
 534                 .auth_level = dce_conn->auth_state.auth_level,
 535                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 536         };
 537         call->out_auth_info = &call->_out_auth_info;
 538
 539         /* pad to 16 byte multiple in the payload portion of the
 540            packet. This matches what w2k3 does. Note that we can't use
 541            ndr_push_align() as that is relative to the start of the
 542            whole packet, whereas w2k8 wants it relative to the start
 543            of the stub */
 544         call->out_auth_info->auth_pad_length =
 545                 DCERPC_AUTH_PAD_LENGTH(pkt->u.response.stub_and_verifier.length);
 546         ndr_err = ndr_push_zero(ndr, call->out_auth_info->auth_pad_length);
 547         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 548                 return false;
 549         }
 550
 551         payload_length = pkt->u.response.stub_and_verifier.length +
 552                 call->out_auth_info->auth_pad_length;
 553
 554         /* add the auth verifier */
 555         ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
 556                                        call->out_auth_info);
 557         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 558                 return false;
 559         }
 560
 561         /* extract the whole packet as a blob */
 562         *blob = ndr_push_blob(ndr);
 563
 564         /*
 565          * Setup the frag and auth length in the packet buffer.
 566          * This is needed if the GENSEC mech does AEAD signing
 567          * of the packet headers. The signature itself will be
 568          * appended later.
 569          */
 570         dcerpc_set_frag_length(blob, blob->length + sig_size);
 571         dcerpc_set_auth_length(blob, sig_size);
 572
 573         /* sign or seal the packet */
 574         switch (dce_conn->auth_state.auth_level) {
 575         case DCERPC_AUTH_LEVEL_PRIVACY:
 576                 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
 577                                             call,
 578                                             ndr->data + DCERPC_REQUEST_LENGTH,
 579                                             payload_length,
 580                                             blob->data,
 581                                             blob->length,
 582                                             &creds2);
 583                 break;
 584
 585         case DCERPC_AUTH_LEVEL_INTEGRITY:
 586                 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
 587                                             call,
 588                                             ndr->data + DCERPC_REQUEST_LENGTH,
 589                                             payload_length,
 590                                             blob->data,
 591                                             blob->length,
 592                                             &creds2);
 593                 break;
 594
 595         default:
 596                 status = NT_STATUS_INVALID_LEVEL;
 597                 break;
 598         }
 599
 600         if (!NT_STATUS_IS_OK(status)) {
 601                 return false;
 602         }
 603
 604         if (creds2.length != sig_size) {
 605                 DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
 606                          (unsigned)creds2.length, (uint32_t)sig_size,
 607                          (unsigned)call->out_auth_info->auth_pad_length,
 608                          (unsigned)pkt->u.response.stub_and_verifier.length));
 609                 dcerpc_set_frag_length(blob, blob->length + creds2.length);
 610                 dcerpc_set_auth_length(blob, creds2.length);
 611         }
 612
 613         if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
 614                 status = NT_STATUS_NO_MEMORY;
 615                 return false;
 616         }
 617         data_blob_free(&creds2);
 618
 619         return true;
 620 }