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         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 242                 return false;
 243         }
 244
 245         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 246                 return false;
 247         }
 248
 249         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 250                 return false;
 251         }
 252
 253         call->_out_auth_info = (struct dcerpc_auth) {
 254                 .auth_type = dce_conn->auth_state.auth_type,
 255                 .auth_level = dce_conn->auth_state.auth_level,
 256                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 257         };
 258         call->out_auth_info = &call->_out_auth_info;
 259
 260         /* Pass the extra data we got from the client down to gensec for processing */
 261         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 262                                call, call->event_ctx,
 263                                call->in_auth_info.credentials,
 264                                &call->out_auth_info->credentials);
 265         if (NT_STATUS_IS_OK(status)) {
 266                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 267                                              dce_conn,
 268                                              &dce_conn->auth_state.session_info);
 269                 if (!NT_STATUS_IS_OK(status)) {
 270                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 271                         return false;
 272                 }
 273                 dce_conn->auth_state.auth_finished = true;
 274                 dce_conn->allow_request = true;
 275
 276                 /* Now that we are authenticated, go back to the generic session key... */
 277                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 278                 return true;
 279         } else {
 280                 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
 281                           nt_errstr(status)));
 282                 return false;
 283         }
 284 }
 285
 286 /*
 287   parse any auth information from a dcerpc alter request
 288   return false if we can't handle the auth request for some
 289   reason (in which case we send a bind_nak (is this true for here?))
 290 */
 291 bool dcesrv_auth_alter(struct dcesrv_call_state *call)
 292 {
 293         struct ncacn_packet *pkt = &call->pkt;
 294         struct dcesrv_connection *dce_conn = call->conn;
 295         NTSTATUS status;
 296         uint32_t auth_length;
 297
 298         /* on a pure interface change there is no auth blob */
 299         if (pkt->auth_length == 0) {
 300                 if (!dce_conn->auth_state.auth_finished) {
 301                         return false;
 302                 }
 303                 return true;
 304         }
 305
 306         if (dce_conn->auth_state.auth_finished) {
 307                 return false;
 308         }
 309
 310         /* We can't work without an existing gensec state */
 311         if (!dce_conn->auth_state.gensec_security) {
 312                 return false;
 313         }
 314
 315         status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
 316                                           &call->in_auth_info, &auth_length, true);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 return false;
 319         }
 320
 321         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 322                 return false;
 323         }
 324
 325         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 326                 return false;
 327         }
 328
 329         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 330                 return false;
 331         }
 332
 333         return true;
 334 }
 335
 336 /*
 337   add any auth information needed in a alter ack, and process the authentication
 338   information found in the alter.
 339 */
 340 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
 341 {
 342         struct dcesrv_connection *dce_conn = call->conn;
 343         NTSTATUS status;
 344
 345         /* on a pure interface change there is no auth_info structure
 346            setup */
 347         if (call->pkt.auth_length == 0) {
 348                 return NT_STATUS_OK;
 349         }
 350
 351         if (!call->conn->auth_state.gensec_security) {
 352                 return NT_STATUS_INTERNAL_ERROR;
 353         }
 354
 355         call->_out_auth_info = (struct dcerpc_auth) {
 356                 .auth_type = dce_conn->auth_state.auth_type,
 357                 .auth_level = dce_conn->auth_state.auth_level,
 358                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 359         };
 360         call->out_auth_info = &call->_out_auth_info;
 361
 362         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 363                                call, call->event_ctx,
 364                                call->in_auth_info.credentials,
 365                                &call->out_auth_info->credentials);
 366
 367         if (NT_STATUS_IS_OK(status)) {
 368                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 369                                              dce_conn,
 370                                              &dce_conn->auth_state.session_info);
 371                 if (!NT_STATUS_IS_OK(status)) {
 372                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 373                         return status;
 374                 }
 375                 dce_conn->auth_state.auth_finished = true;
 376                 dce_conn->allow_request = true;
 377
 378                 /* Now that we are authenticated, got back to the generic session key... */
 379                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 380                 return NT_STATUS_OK;
 381         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 382                 return NT_STATUS_OK;
 383         }
 384
 385         DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
 386                   nt_errstr(status)));
 387         return status;
 388 }
 389
 390 /*
 391   check credentials on a request
 392 */
 393 bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
 394 {
 395         struct ncacn_packet *pkt = &call->pkt;
 396         struct dcesrv_connection *dce_conn = call->conn;
 397         NTSTATUS status;
 398         uint32_t auth_length;
 399         size_t hdr_size = DCERPC_REQUEST_LENGTH;
 400
 401         if (!dce_conn->allow_request) {
 402                 return false;
 403         }
 404
 405         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
 406                 hdr_size += 16;
 407         }
 408
 409         switch (dce_conn->auth_state.auth_level) {
 410         case DCERPC_AUTH_LEVEL_PRIVACY:
 411         case DCERPC_AUTH_LEVEL_INTEGRITY:
 412                 break;
 413
 414         case DCERPC_AUTH_LEVEL_CONNECT:
 415                 if (pkt->auth_length != 0) {
 416                         break;
 417                 }
 418                 return true;
 419         case DCERPC_AUTH_LEVEL_NONE:
 420                 if (pkt->auth_length != 0) {
 421                         return false;
 422                 }
 423                 return true;
 424
 425         default:
 426                 return false;
 427         }
 428
 429         if (!dce_conn->auth_state.gensec_security) {
 430                 return false;
 431         }
 432
 433         status = dcerpc_pull_auth_trailer(pkt, call,
 434                                           &pkt->u.request.stub_and_verifier,
 435                                           &call->in_auth_info, &auth_length, false);
 436         if (!NT_STATUS_IS_OK(status)) {
 437                 return false;
 438         }
 439
 440         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 441                 return false;
 442         }
 443
 444         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 445                 return false;
 446         }
 447
 448         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 449                 return false;
 450         }
 451
 452         pkt->u.request.stub_and_verifier.length -= auth_length;
 453
 454         /* check signature or unseal the packet */
 455         switch (dce_conn->auth_state.auth_level) {
 456         case DCERPC_AUTH_LEVEL_PRIVACY:
 457                 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
 458                                               full_packet->data + hdr_size,
 459                                               pkt->u.request.stub_and_verifier.length,
 460                                               full_packet->data,
 461                                               full_packet->length-
 462                                               call->in_auth_info.credentials.length,
 463                                               &call->in_auth_info.credentials);
 464                 memcpy(pkt->u.request.stub_and_verifier.data,
 465                        full_packet->data + hdr_size,
 466                        pkt->u.request.stub_and_verifier.length);
 467                 break;
 468
 469         case DCERPC_AUTH_LEVEL_INTEGRITY:
 470                 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
 471                                              pkt->u.request.stub_and_verifier.data,
 472                                              pkt->u.request.stub_and_verifier.length,
 473                                              full_packet->data,
 474                                              full_packet->length-
 475                                              call->in_auth_info.credentials.length,
 476                                              &call->in_auth_info.credentials);
 477                 break;
 478
 479         case DCERPC_AUTH_LEVEL_CONNECT:
 480                 /* for now we ignore possible signatures here */
 481                 status = NT_STATUS_OK;
 482                 break;
 483
 484         default:
 485                 status = NT_STATUS_INVALID_LEVEL;
 486                 break;
 487         }
 488
 489         /* remove the indicated amount of padding */
 490         if (pkt->u.request.stub_and_verifier.length < call->in_auth_info.auth_pad_length) {
 491                 return false;
 492         }
 493         pkt->u.request.stub_and_verifier.length -= call->in_auth_info.auth_pad_length;
 494
 495         return NT_STATUS_IS_OK(status);
 496 }
 497
 498
 499 /*
 500    push a signed or sealed dcerpc request packet into a blob
 501 */
 502 bool dcesrv_auth_response(struct dcesrv_call_state *call,
 503                           DATA_BLOB *blob, size_t sig_size,
 504                           struct ncacn_packet *pkt)
 505 {
 506         struct dcesrv_connection *dce_conn = call->conn;
 507         NTSTATUS status;
 508         enum ndr_err_code ndr_err;
 509         struct ndr_push *ndr;
 510         uint32_t payload_length;
 511         DATA_BLOB creds2;
 512
 513         switch (dce_conn->auth_state.auth_level) {
 514         case DCERPC_AUTH_LEVEL_PRIVACY:
 515         case DCERPC_AUTH_LEVEL_INTEGRITY:
 516                 if (sig_size == 0) {
 517                         return false;
 518                 }
 519
 520                 break;
 521
 522         case DCERPC_AUTH_LEVEL_CONNECT:
 523                 /*
 524                  * TODO: let the gensec mech decide if it wants to generate a
 525                  *       signature that might be needed for schannel...
 526                  */
 527                 status = ncacn_push_auth(blob, call, pkt, NULL);
 528                 return NT_STATUS_IS_OK(status);
 529
 530         case DCERPC_AUTH_LEVEL_NONE:
 531                 status = ncacn_push_auth(blob, call, pkt, NULL);
 532                 return NT_STATUS_IS_OK(status);
 533
 534         default:
 535                 return false;
 536         }
 537
 538         if (!dce_conn->auth_state.gensec_security) {
 539                 return false;
 540         }
 541
 542         ndr = ndr_push_init_ctx(call);
 543         if (!ndr) {
 544                 return false;
 545         }
 546
 547         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 548                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 549         }
 550
 551         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
 552         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 553                 return false;
 554         }
 555
 556         call->_out_auth_info = (struct dcerpc_auth) {
 557                 .auth_type = dce_conn->auth_state.auth_type,
 558                 .auth_level = dce_conn->auth_state.auth_level,
 559                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 560         };
 561         call->out_auth_info = &call->_out_auth_info;
 562
 563         /* pad to 16 byte multiple in the payload portion of the
 564            packet. This matches what w2k3 does. Note that we can't use
 565            ndr_push_align() as that is relative to the start of the
 566            whole packet, whereas w2k8 wants it relative to the start
 567            of the stub */
 568         call->out_auth_info->auth_pad_length =
 569                 DCERPC_AUTH_PAD_LENGTH(pkt->u.response.stub_and_verifier.length);
 570         ndr_err = ndr_push_zero(ndr, call->out_auth_info->auth_pad_length);
 571         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 572                 return false;
 573         }
 574
 575         payload_length = pkt->u.response.stub_and_verifier.length +
 576                 call->out_auth_info->auth_pad_length;
 577
 578         /* add the auth verifier */
 579         ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
 580                                        call->out_auth_info);
 581         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 582                 return false;
 583         }
 584
 585         /* extract the whole packet as a blob */
 586         *blob = ndr_push_blob(ndr);
 587
 588         /*
 589          * Setup the frag and auth length in the packet buffer.
 590          * This is needed if the GENSEC mech does AEAD signing
 591          * of the packet headers. The signature itself will be
 592          * appended later.
 593          */
 594         dcerpc_set_frag_length(blob, blob->length + sig_size);
 595         dcerpc_set_auth_length(blob, sig_size);
 596
 597         /* sign or seal the packet */
 598         switch (dce_conn->auth_state.auth_level) {
 599         case DCERPC_AUTH_LEVEL_PRIVACY:
 600                 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
 601                                             call,
 602                                             ndr->data + DCERPC_REQUEST_LENGTH,
 603                                             payload_length,
 604                                             blob->data,
 605                                             blob->length,
 606                                             &creds2);
 607                 break;
 608
 609         case DCERPC_AUTH_LEVEL_INTEGRITY:
 610                 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
 611                                             call,
 612                                             ndr->data + DCERPC_REQUEST_LENGTH,
 613                                             payload_length,
 614                                             blob->data,
 615                                             blob->length,
 616                                             &creds2);
 617                 break;
 618
 619         default:
 620                 status = NT_STATUS_INVALID_LEVEL;
 621                 break;
 622         }
 623
 624         if (!NT_STATUS_IS_OK(status)) {
 625                 return false;
 626         }
 627
 628         if (creds2.length != sig_size) {
 629                 DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
 630                          (unsigned)creds2.length, (uint32_t)sig_size,
 631                          (unsigned)call->out_auth_info->auth_pad_length,
 632                          (unsigned)pkt->u.response.stub_and_verifier.length));
 633                 dcerpc_set_frag_length(blob, blob->length + creds2.length);
 634                 dcerpc_set_auth_length(blob, creds2.length);
 635         }
 636
 637         if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
 638                 status = NT_STATUS_NO_MEMORY;
 639                 return false;
 640         }
 641         data_blob_free(&creds2);
 642
 643         return true;
 644 }