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
 279                 if (call->out_auth_info->credentials.length != 0) {
 280
 281                         DEBUG(4, ("GENSEC produced output token (len=%u) at bind_auth3\n",
 282                                   (unsigned)call->out_auth_info->credentials.length));
 283                         return false;
 284                 }
 285                 return true;
 286         } else {
 287                 DEBUG(4, ("GENSEC mech rejected the incoming authentication at bind_auth3: %s\n",
 288                           nt_errstr(status)));
 289                 return false;
 290         }
 291 }
 292
 293 /*
 294   parse any auth information from a dcerpc alter request
 295   return false if we can't handle the auth request for some
 296   reason (in which case we send a bind_nak (is this true for here?))
 297 */
 298 bool dcesrv_auth_alter(struct dcesrv_call_state *call)
 299 {
 300         struct ncacn_packet *pkt = &call->pkt;
 301         struct dcesrv_connection *dce_conn = call->conn;
 302         NTSTATUS status;
 303         uint32_t auth_length;
 304
 305         /* on a pure interface change there is no auth blob */
 306         if (pkt->auth_length == 0) {
 307                 if (!dce_conn->auth_state.auth_finished) {
 308                         return false;
 309                 }
 310                 return true;
 311         }
 312
 313         if (dce_conn->auth_state.auth_finished) {
 314                 return false;
 315         }
 316
 317         /* We can't work without an existing gensec state */
 318         if (!dce_conn->auth_state.gensec_security) {
 319                 return false;
 320         }
 321
 322         status = dcerpc_pull_auth_trailer(pkt, call, &pkt->u.alter.auth_info,
 323                                           &call->in_auth_info, &auth_length, true);
 324         if (!NT_STATUS_IS_OK(status)) {
 325                 return false;
 326         }
 327
 328         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 329                 return false;
 330         }
 331
 332         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 333                 return false;
 334         }
 335
 336         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 337                 return false;
 338         }
 339
 340         return true;
 341 }
 342
 343 /*
 344   add any auth information needed in a alter ack, and process the authentication
 345   information found in the alter.
 346 */
 347 NTSTATUS dcesrv_auth_alter_ack(struct dcesrv_call_state *call, struct ncacn_packet *pkt)
 348 {
 349         struct dcesrv_connection *dce_conn = call->conn;
 350         NTSTATUS status;
 351
 352         /* on a pure interface change there is no auth_info structure
 353            setup */
 354         if (call->pkt.auth_length == 0) {
 355                 return NT_STATUS_OK;
 356         }
 357
 358         if (!call->conn->auth_state.gensec_security) {
 359                 return NT_STATUS_INTERNAL_ERROR;
 360         }
 361
 362         call->_out_auth_info = (struct dcerpc_auth) {
 363                 .auth_type = dce_conn->auth_state.auth_type,
 364                 .auth_level = dce_conn->auth_state.auth_level,
 365                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 366         };
 367         call->out_auth_info = &call->_out_auth_info;
 368
 369         status = gensec_update_ev(dce_conn->auth_state.gensec_security,
 370                                call, call->event_ctx,
 371                                call->in_auth_info.credentials,
 372                                &call->out_auth_info->credentials);
 373
 374         if (NT_STATUS_IS_OK(status)) {
 375                 status = gensec_session_info(dce_conn->auth_state.gensec_security,
 376                                              dce_conn,
 377                                              &dce_conn->auth_state.session_info);
 378                 if (!NT_STATUS_IS_OK(status)) {
 379                         DEBUG(1, ("Failed to establish session_info: %s\n", nt_errstr(status)));
 380                         return status;
 381                 }
 382                 dce_conn->auth_state.auth_finished = true;
 383                 dce_conn->allow_request = true;
 384
 385                 /* Now that we are authenticated, got back to the generic session key... */
 386                 dce_conn->auth_state.session_key = dcesrv_generic_session_key;
 387                 return NT_STATUS_OK;
 388         } else if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 389                 return NT_STATUS_OK;
 390         }
 391
 392         DEBUG(4, ("GENSEC mech rejected the incoming authentication at auth alter_ack: %s\n",
 393                   nt_errstr(status)));
 394         return status;
 395 }
 396
 397 /*
 398   check credentials on a request
 399 */
 400 bool dcesrv_auth_request(struct dcesrv_call_state *call, DATA_BLOB *full_packet)
 401 {
 402         struct ncacn_packet *pkt = &call->pkt;
 403         struct dcesrv_connection *dce_conn = call->conn;
 404         NTSTATUS status;
 405         uint32_t auth_length;
 406         size_t hdr_size = DCERPC_REQUEST_LENGTH;
 407
 408         if (!dce_conn->allow_request) {
 409                 return false;
 410         }
 411
 412         if (dce_conn->auth_state.auth_invalid) {
 413                 return false;
 414         }
 415
 416         if (pkt->pfc_flags & DCERPC_PFC_FLAG_OBJECT_UUID) {
 417                 hdr_size += 16;
 418         }
 419
 420         switch (dce_conn->auth_state.auth_level) {
 421         case DCERPC_AUTH_LEVEL_PRIVACY:
 422         case DCERPC_AUTH_LEVEL_INTEGRITY:
 423                 break;
 424
 425         case DCERPC_AUTH_LEVEL_CONNECT:
 426                 if (pkt->auth_length != 0) {
 427                         break;
 428                 }
 429                 return true;
 430         case DCERPC_AUTH_LEVEL_NONE:
 431                 if (pkt->auth_length != 0) {
 432                         return false;
 433                 }
 434                 return true;
 435
 436         default:
 437                 return false;
 438         }
 439
 440         if (!dce_conn->auth_state.gensec_security) {
 441                 return false;
 442         }
 443
 444         status = dcerpc_pull_auth_trailer(pkt, call,
 445                                           &pkt->u.request.stub_and_verifier,
 446                                           &call->in_auth_info, &auth_length, false);
 447         if (!NT_STATUS_IS_OK(status)) {
 448                 return false;
 449         }
 450
 451         if (call->in_auth_info.auth_type != dce_conn->auth_state.auth_type) {
 452                 return false;
 453         }
 454
 455         if (call->in_auth_info.auth_level != dce_conn->auth_state.auth_level) {
 456                 return false;
 457         }
 458
 459         if (call->in_auth_info.auth_context_id != dce_conn->auth_state.auth_context_id) {
 460                 return false;
 461         }
 462
 463         pkt->u.request.stub_and_verifier.length -= auth_length;
 464
 465         /* check signature or unseal the packet */
 466         switch (dce_conn->auth_state.auth_level) {
 467         case DCERPC_AUTH_LEVEL_PRIVACY:
 468                 status = gensec_unseal_packet(dce_conn->auth_state.gensec_security,
 469                                               full_packet->data + hdr_size,
 470                                               pkt->u.request.stub_and_verifier.length,
 471                                               full_packet->data,
 472                                               full_packet->length-
 473                                               call->in_auth_info.credentials.length,
 474                                               &call->in_auth_info.credentials);
 475                 memcpy(pkt->u.request.stub_and_verifier.data,
 476                        full_packet->data + hdr_size,
 477                        pkt->u.request.stub_and_verifier.length);
 478                 break;
 479
 480         case DCERPC_AUTH_LEVEL_INTEGRITY:
 481                 status = gensec_check_packet(dce_conn->auth_state.gensec_security,
 482                                              pkt->u.request.stub_and_verifier.data,
 483                                              pkt->u.request.stub_and_verifier.length,
 484                                              full_packet->data,
 485                                              full_packet->length-
 486                                              call->in_auth_info.credentials.length,
 487                                              &call->in_auth_info.credentials);
 488                 break;
 489
 490         case DCERPC_AUTH_LEVEL_CONNECT:
 491                 /* for now we ignore possible signatures here */
 492                 status = NT_STATUS_OK;
 493                 break;
 494
 495         default:
 496                 status = NT_STATUS_INVALID_LEVEL;
 497                 break;
 498         }
 499
 500         /* remove the indicated amount of padding */
 501         if (pkt->u.request.stub_and_verifier.length < call->in_auth_info.auth_pad_length) {
 502                 return false;
 503         }
 504         pkt->u.request.stub_and_verifier.length -= call->in_auth_info.auth_pad_length;
 505
 506         return NT_STATUS_IS_OK(status);
 507 }
 508
 509
 510 /*
 511    push a signed or sealed dcerpc request packet into a blob
 512 */
 513 bool dcesrv_auth_response(struct dcesrv_call_state *call,
 514                           DATA_BLOB *blob, size_t sig_size,
 515                           struct ncacn_packet *pkt)
 516 {
 517         struct dcesrv_connection *dce_conn = call->conn;
 518         NTSTATUS status;
 519         enum ndr_err_code ndr_err;
 520         struct ndr_push *ndr;
 521         uint32_t payload_length;
 522         DATA_BLOB creds2;
 523
 524         switch (dce_conn->auth_state.auth_level) {
 525         case DCERPC_AUTH_LEVEL_PRIVACY:
 526         case DCERPC_AUTH_LEVEL_INTEGRITY:
 527                 if (sig_size == 0) {
 528                         return false;
 529                 }
 530
 531                 break;
 532
 533         case DCERPC_AUTH_LEVEL_CONNECT:
 534                 /*
 535                  * TODO: let the gensec mech decide if it wants to generate a
 536                  *       signature that might be needed for schannel...
 537                  */
 538                 status = ncacn_push_auth(blob, call, pkt, NULL);
 539                 return NT_STATUS_IS_OK(status);
 540
 541         case DCERPC_AUTH_LEVEL_NONE:
 542                 status = ncacn_push_auth(blob, call, pkt, NULL);
 543                 return NT_STATUS_IS_OK(status);
 544
 545         default:
 546                 return false;
 547         }
 548
 549         if (!dce_conn->auth_state.gensec_security) {
 550                 return false;
 551         }
 552
 553         ndr = ndr_push_init_ctx(call);
 554         if (!ndr) {
 555                 return false;
 556         }
 557
 558         if (!(pkt->drep[0] & DCERPC_DREP_LE)) {
 559                 ndr->flags |= LIBNDR_FLAG_BIGENDIAN;
 560         }
 561
 562         ndr_err = ndr_push_ncacn_packet(ndr, NDR_SCALARS|NDR_BUFFERS, pkt);
 563         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 564                 return false;
 565         }
 566
 567         call->_out_auth_info = (struct dcerpc_auth) {
 568                 .auth_type = dce_conn->auth_state.auth_type,
 569                 .auth_level = dce_conn->auth_state.auth_level,
 570                 .auth_context_id = dce_conn->auth_state.auth_context_id,
 571         };
 572         call->out_auth_info = &call->_out_auth_info;
 573
 574         /* pad to 16 byte multiple in the payload portion of the
 575            packet. This matches what w2k3 does. Note that we can't use
 576            ndr_push_align() as that is relative to the start of the
 577            whole packet, whereas w2k8 wants it relative to the start
 578            of the stub */
 579         call->out_auth_info->auth_pad_length =
 580                 DCERPC_AUTH_PAD_LENGTH(pkt->u.response.stub_and_verifier.length);
 581         ndr_err = ndr_push_zero(ndr, call->out_auth_info->auth_pad_length);
 582         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 583                 return false;
 584         }
 585
 586         payload_length = pkt->u.response.stub_and_verifier.length +
 587                 call->out_auth_info->auth_pad_length;
 588
 589         /* add the auth verifier */
 590         ndr_err = ndr_push_dcerpc_auth(ndr, NDR_SCALARS|NDR_BUFFERS,
 591                                        call->out_auth_info);
 592         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 593                 return false;
 594         }
 595
 596         /* extract the whole packet as a blob */
 597         *blob = ndr_push_blob(ndr);
 598
 599         /*
 600          * Setup the frag and auth length in the packet buffer.
 601          * This is needed if the GENSEC mech does AEAD signing
 602          * of the packet headers. The signature itself will be
 603          * appended later.
 604          */
 605         dcerpc_set_frag_length(blob, blob->length + sig_size);
 606         dcerpc_set_auth_length(blob, sig_size);
 607
 608         /* sign or seal the packet */
 609         switch (dce_conn->auth_state.auth_level) {
 610         case DCERPC_AUTH_LEVEL_PRIVACY:
 611                 status = gensec_seal_packet(dce_conn->auth_state.gensec_security,
 612                                             call,
 613                                             ndr->data + DCERPC_REQUEST_LENGTH,
 614                                             payload_length,
 615                                             blob->data,
 616                                             blob->length,
 617                                             &creds2);
 618                 break;
 619
 620         case DCERPC_AUTH_LEVEL_INTEGRITY:
 621                 status = gensec_sign_packet(dce_conn->auth_state.gensec_security,
 622                                             call,
 623                                             ndr->data + DCERPC_REQUEST_LENGTH,
 624                                             payload_length,
 625                                             blob->data,
 626                                             blob->length,
 627                                             &creds2);
 628                 break;
 629
 630         default:
 631                 status = NT_STATUS_INVALID_LEVEL;
 632                 break;
 633         }
 634
 635         if (!NT_STATUS_IS_OK(status)) {
 636                 return false;
 637         }
 638
 639         if (creds2.length != sig_size) {
 640                 DEBUG(3,("dcesrv_auth_response: creds2.length[%u] != sig_size[%u] pad[%u] stub[%u]\n",
 641                          (unsigned)creds2.length, (uint32_t)sig_size,
 642                          (unsigned)call->out_auth_info->auth_pad_length,
 643                          (unsigned)pkt->u.response.stub_and_verifier.length));
 644                 dcerpc_set_frag_length(blob, blob->length + creds2.length);
 645                 dcerpc_set_auth_length(blob, creds2.length);
 646         }
 647
 648         if (!data_blob_append(call, blob, creds2.data, creds2.length)) {
 649                 status = NT_STATUS_NO_MEMORY;
 650                 return false;
 651         }
 652         data_blob_free(&creds2);
 653
 654         return true;
 655 }