source4/kdc/kpasswdd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    kpasswd Server implementation
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Andrew Tridgell        2005
   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 "smbd/service_task.h"
  25 #include "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "system/network.h"
  28 #include "lib/util/dlinklist.h"
  29 #include "lib/ldb/include/ldb.h"
  30 #include "auth/gensec/gensec.h"
  31 #include "auth/credentials/credentials.h"
  32 #include "auth/credentials/credentials_krb5.h"
  33 #include "auth/auth.h"
  34 #include "dsdb/samdb/samdb.h"
  35 #include "rpc_server/dcerpc_server.h"
  36 #include "rpc_server/samr/proto.h"
  37 #include "libcli/security/security.h"
  38 #include "param/param.h"
  39 #include "kdc/kdc.h"
  40
  41 /* TODO: remove all SAMBA4_INTERNAL_HEIMDAL stuff from this file */
  42 #ifdef SAMBA4_INTERNAL_HEIMDAL
  43 #include "heimdal/lib/hcrypto/aes.h"
  44 #include "heimdal/lib/krb5/krb5-private.h"
  45 #endif
  46
  47 /* hold information about one kdc socket */
  48 struct kpasswd_socket {
  49         struct socket_context *sock;
  50         struct kdc_server *kdc;
  51         struct fd_event *fde;
  52
  53         /* a queue of outgoing replies that have been deferred */
  54         struct kdc_reply *send_queue;
  55 };
  56
  57 /* Return true if there is a valid error packet formed in the error_blob */
  58 static bool kpasswdd_make_error_reply(struct kdc_server *kdc,
  59                                      TALLOC_CTX *mem_ctx,
  60                                      uint16_t result_code,
  61                                      const char *error_string,
  62                                      DATA_BLOB *error_blob)
  63 {
  64         char *error_string_utf8;
  65         ssize_t len;
  66
  67         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
  68
  69         len = push_utf8_talloc(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), &error_string_utf8, error_string);
  70         if (len == -1) {
  71                 return false;
  72         }
  73
  74         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
  75         if (!error_blob->data) {
  76                 return false;
  77         }
  78         RSSVAL(error_blob->data, 0, result_code);
  79         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
  80         return true;
  81 }
  82
  83 /* Return true if there is a valid error packet formed in the error_blob */
  84 static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc,
  85                                             TALLOC_CTX *mem_ctx,
  86                                             uint16_t result_code,
  87                                             const char *error_string,
  88                                             DATA_BLOB *error_blob)
  89 {
  90         bool ret;
  91         int kret;
  92         DATA_BLOB error_bytes;
  93         krb5_data k5_error_bytes, k5_error_blob;
  94         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string,
  95                                        &error_bytes);
  96         if (!ret) {
  97                 return false;
  98         }
  99         k5_error_bytes.data = error_bytes.data;
 100         k5_error_bytes.length = error_bytes.length;
 101         kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
 102                              result_code, NULL, &k5_error_bytes,
 103                              NULL, NULL, NULL, NULL, &k5_error_blob);
 104         if (kret) {
 105                 return false;
 106         }
 107         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
 108         krb5_data_free(&k5_error_blob);
 109         if (!error_blob->data) {
 110                 return false;
 111         }
 112         return true;
 113 }
 114
 115 static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc,
 116                                         TALLOC_CTX *mem_ctx,
 117                                         NTSTATUS status,
 118                                         enum samr_RejectReason reject_reason,
 119                                         struct samr_DomInfo1 *dominfo,
 120                                         DATA_BLOB *error_blob)
 121 {
 122         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
 123                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 124                                                 KRB5_KPASSWD_ACCESSDENIED,
 125                                                 "No such user when changing password",
 126                                                 error_blob);
 127         }
 128         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 129                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 130                                                 KRB5_KPASSWD_ACCESSDENIED,
 131                                                 "Not permitted to change password",
 132                                                 error_blob);
 133         }
 134         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
 135                 const char *reject_string;
 136                 switch (reject_reason) {
 137                 case SAMR_REJECT_TOO_SHORT:
 138                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long",
 139                                                         dominfo->min_password_length);
 140                         break;
 141                 case SAMR_REJECT_COMPLEXITY:
 142                         reject_string = "Password does not meet complexity requirements";
 143                         break;
 144                 case SAMR_REJECT_IN_HISTORY:
 145                         reject_string = "Password is already in password history";
 146                         break;
 147                 case SAMR_REJECT_OTHER:
 148                 default:
 149                         reject_string = talloc_asprintf(mem_ctx, "Password must be at least %d characters long, and cannot match any of your %d previous passwords",
 150                                                         dominfo->min_password_length, dominfo->password_history_length);
 151                         break;
 152                 }
 153                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 154                                                 KRB5_KPASSWD_SOFTERROR,
 155                                                 reject_string,
 156                                                 error_blob);
 157         }
 158         if (!NT_STATUS_IS_OK(status)) {
 159                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 160                                                  KRB5_KPASSWD_HARDERROR,
 161                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
 162                                                  error_blob);
 163
 164         }
 165         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
 166                                         "Password changed",
 167                                         error_blob);
 168 }
 169
 170 /*
 171    A user password change
 172
 173    Return true if there is a valid error packet (or sucess) formed in
 174    the error_blob
 175 */
 176 static bool kpasswdd_change_password(struct kdc_server *kdc,
 177                                      TALLOC_CTX *mem_ctx,
 178                                      struct auth_session_info *session_info,
 179                                      const char *password,
 180                                      DATA_BLOB *reply)
 181 {
 182         NTSTATUS status;
 183         enum samr_RejectReason reject_reason;
 184         struct samr_DomInfo1 *dominfo;
 185         struct ldb_context *samdb;
 186
 187         samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, system_session(mem_ctx, kdc->task->lp_ctx));
 188         if (!samdb) {
 189                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 190                                                 KRB5_KPASSWD_HARDERROR,
 191                                                 "Failed to open samdb",
 192                                                 reply);
 193         }
 194
 195         DEBUG(3, ("Changing password of %s\\%s (%s)\n",
 196                   session_info->server_info->domain_name,
 197                   session_info->server_info->account_name,
 198                   dom_sid_string(mem_ctx, session_info->security_token->user_sid)));
 199
 200         /* User password change */
 201         status = samdb_set_password_sid(samdb, mem_ctx,
 202                                         session_info->security_token->user_sid,
 203                                         password, NULL, NULL,
 204                                         true, /* this is a user password change */
 205                                         &reject_reason,
 206                                         &dominfo);
 207         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 208                                            status,
 209                                            reject_reason,
 210                                            dominfo,
 211                                            reply);
 212
 213 }
 214
 215 static bool kpasswd_process_request(struct kdc_server *kdc,
 216                                     TALLOC_CTX *mem_ctx,
 217                                     struct gensec_security *gensec_security,
 218                                     uint16_t version,
 219                                     DATA_BLOB *input,
 220                                     DATA_BLOB *reply)
 221 {
 222         struct auth_session_info *session_info;
 223         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
 224                                                  &session_info))) {
 225                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 226                                                 KRB5_KPASSWD_HARDERROR,
 227                                                 "gensec_session_info failed!",
 228                                                 reply);
 229         }
 230
 231         switch (version) {
 232         case KRB5_KPASSWD_VERS_CHANGEPW:
 233         {
 234                 char *password = talloc_strndup(mem_ctx, (const char *)input->data, input->length);
 235                 if (!password) {
 236                         return false;
 237                 }
 238                 return kpasswdd_change_password(kdc, mem_ctx, session_info,
 239                                                 password, reply);
 240                 break;
 241         }
 242         case KRB5_KPASSWD_VERS_SETPW:
 243         {
 244                 NTSTATUS status;
 245                 enum samr_RejectReason reject_reason = SAMR_REJECT_OTHER;
 246                 struct samr_DomInfo1 *dominfo = NULL;
 247                 struct ldb_context *samdb;
 248                 struct ldb_message *msg;
 249                 krb5_context context = kdc->smb_krb5_context->krb5_context;
 250
 251                 ChangePasswdDataMS chpw;
 252                 char *password;
 253
 254                 krb5_principal principal;
 255                 char *set_password_on_princ;
 256                 struct ldb_dn *set_password_on_dn;
 257
 258                 size_t len;
 259                 int ret;
 260
 261                 msg = ldb_msg_new(mem_ctx);
 262                 if (!msg) {
 263                         return false;
 264                 }
 265
 266                 ret = decode_ChangePasswdDataMS(input->data, input->length,
 267                                                 &chpw, &len);
 268                 if (ret) {
 269                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 270                                                         KRB5_KPASSWD_MALFORMED,
 271                                                         "failed to decode password change structure",
 272                                                         reply);
 273                 }
 274
 275                 password = talloc_strndup(mem_ctx,
 276                                           (const char *)chpw.newpasswd.data,
 277                                           chpw.newpasswd.length);
 278                 if (!password) {
 279                         free_ChangePasswdDataMS(&chpw);
 280                         return false;
 281                 }
 282                 if ((chpw.targname && !chpw.targrealm)
 283                     || (!chpw.targname && chpw.targrealm)) {
 284                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 285                                                         KRB5_KPASSWD_MALFORMED,
 286                                                         "Realm and principal must be both present, or neither present",
 287                                                         reply);
 288                 }
 289                 if (chpw.targname && chpw.targrealm) {
 290 #ifdef SAMBA4_INTERNAL_HEIMDAL
 291                         if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context,
 292                                                                &principal, *chpw.targname,
 293                                                                *chpw.targrealm) != 0) {
 294                                 free_ChangePasswdDataMS(&chpw);
 295                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 296                                                                 KRB5_KPASSWD_MALFORMED,
 297                                                                 "failed to extract principal to set",
 298                                                                 reply);
 299
 300                         }
 301 #else /* SAMBA4_INTERNAL_HEIMDAL */
 302                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 303                                                                 KRB5_KPASSWD_BAD_VERSION,
 304                                                                 "Operation Not Implemented",
 305                                                                 reply);
 306 #endif /* SAMBA4_INTERNAL_HEIMDAL */
 307                 } else {
 308                         free_ChangePasswdDataMS(&chpw);
 309                         return kpasswdd_change_password(kdc, mem_ctx, session_info,
 310                                                         password, reply);
 311                 }
 312                 free_ChangePasswdDataMS(&chpw);
 313
 314                 if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
 315                         krb5_free_principal(context, principal);
 316                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 317                                                         KRB5_KPASSWD_MALFORMED,
 318                                                         "krb5_unparse_name failed!",
 319                                                         reply);
 320                 }
 321
 322                 krb5_free_principal(context, principal);
 323
 324                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info);
 325                 if (!samdb) {
 326                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 327                                                          KRB5_KPASSWD_HARDERROR,
 328                                                          "Unable to open database!",
 329                                                          reply);
 330                 }
 331
 332                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
 333                           session_info->server_info->domain_name,
 334                           session_info->server_info->account_name,
 335                           dom_sid_string(mem_ctx, session_info->security_token->user_sid),
 336                           set_password_on_princ));
 337                 ret = ldb_transaction_start(samdb);
 338                 if (ret) {
 339                         status = NT_STATUS_TRANSACTION_ABORTED;
 340                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 341                                                            status,
 342                                                            SAMR_REJECT_OTHER,
 343                                                            NULL,
 344                                                            reply);
 345                 }
 346
 347                 status = crack_user_principal_name(samdb, mem_ctx,
 348                                                    set_password_on_princ,
 349                                                    &set_password_on_dn, NULL);
 350                 free(set_password_on_princ);
 351                 if (!NT_STATUS_IS_OK(status)) {
 352                         ldb_transaction_cancel(samdb);
 353                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 354                                                            status,
 355                                                            SAMR_REJECT_OTHER,
 356                                                            NULL,
 357                                                            reply);
 358                 }
 359
 360                 msg = ldb_msg_new(mem_ctx);
 361                 if (msg == NULL) {
 362                         ldb_transaction_cancel(samdb);
 363                         status = NT_STATUS_NO_MEMORY;
 364                 } else {
 365                         msg->dn = ldb_dn_copy(msg, set_password_on_dn);
 366                         if (!msg->dn) {
 367                                 status = NT_STATUS_NO_MEMORY;
 368                         }
 369                 }
 370
 371                 if (NT_STATUS_IS_OK(status)) {
 372                         /* Admin password set */
 373                         status = samdb_set_password(samdb, mem_ctx,
 374                                                     set_password_on_dn, NULL,
 375                                                     msg, password, NULL, NULL,
 376                                                     false, /* this is not a user password change */
 377                                                     &reject_reason, &dominfo);
 378                 }
 379
 380                 if (NT_STATUS_IS_OK(status)) {
 381                         /* modify the samdb record */
 382                         ret = samdb_replace(samdb, mem_ctx, msg);
 383                         if (ret != 0) {
 384                                 DEBUG(2,("Failed to modify record to set password on %s: %s\n",
 385                                          ldb_dn_get_linearized(msg->dn),
 386                                          ldb_errstring(samdb)));
 387                                 status = NT_STATUS_ACCESS_DENIED;
 388                         }
 389                 }
 390                 if (NT_STATUS_IS_OK(status)) {
 391                         ret = ldb_transaction_commit(samdb);
 392                         if (ret != 0) {
 393                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
 394                                          ldb_dn_get_linearized(msg->dn),
 395                                          ldb_errstring(samdb)));
 396                                 status = NT_STATUS_TRANSACTION_ABORTED;
 397                         }
 398                 } else {
 399                         ldb_transaction_cancel(samdb);
 400                 }
 401                 return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 402                                                    status,
 403                                                    reject_reason,
 404                                                    dominfo,
 405                                                    reply);
 406         }
 407         default:
 408                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 409                                                  KRB5_KPASSWD_BAD_VERSION,
 410                                                  talloc_asprintf(mem_ctx,
 411                                                                  "Protocol version %u not supported",
 412                                                                  version),
 413                                                  reply);
 414         }
 415         return true;
 416 }
 417
 418 bool kpasswdd_process(struct kdc_server *kdc,
 419                       TALLOC_CTX *mem_ctx,
 420                       DATA_BLOB *input,
 421                       DATA_BLOB *reply,
 422                       struct socket_address *peer_addr,
 423                       struct socket_address *my_addr,
 424                       int datagram_reply)
 425 {
 426         bool ret;
 427         const uint16_t header_len = 6;
 428         uint16_t len;
 429         uint16_t ap_req_len;
 430         uint16_t krb_priv_len;
 431         uint16_t version;
 432         NTSTATUS nt_status;
 433         DATA_BLOB ap_req, krb_priv_req;
 434         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
 435         DATA_BLOB ap_rep = data_blob(NULL, 0);
 436         DATA_BLOB kpasswd_req, kpasswd_rep;
 437         struct cli_credentials *server_credentials;
 438         struct gensec_security *gensec_security;
 439         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 440
 441         if (!tmp_ctx) {
 442                 return false;
 443         }
 444
 445         /* Be parinoid.  We need to ensure we don't just let the
 446          * caller lead us into a buffer overflow */
 447         if (input->length <= header_len) {
 448                 talloc_free(tmp_ctx);
 449                 return false;
 450         }
 451
 452         len = RSVAL(input->data, 0);
 453         if (input->length != len) {
 454                 talloc_free(tmp_ctx);
 455                 return false;
 456         }
 457
 458         /* There are two different versions of this protocol so far,
 459          * plus others in the standards pipe.  Fortunetly they all
 460          * take a very similar framing */
 461         version = RSVAL(input->data, 2);
 462         ap_req_len = RSVAL(input->data, 4);
 463         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
 464                 talloc_free(tmp_ctx);
 465                 return false;
 466         }
 467
 468         krb_priv_len = len - ap_req_len;
 469         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
 470         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
 471
 472         nt_status = gensec_server_start(tmp_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, kdc->task->msg_ctx, &gensec_security);
 473         if (!NT_STATUS_IS_OK(nt_status)) {
 474                 talloc_free(tmp_ctx);
 475                 return false;
 476         }
 477
 478         server_credentials = cli_credentials_init(tmp_ctx);
 479         if (!server_credentials) {
 480                 DEBUG(1, ("Failed to init server credentials\n"));
 481                 return false;
 482         }
 483
 484         /* We want the credentials subsystem to use the krb5 context
 485          * we already have, rather than a new context */
 486         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
 487         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
 488         nt_status = cli_credentials_set_stored_principal(server_credentials, kdc->task->event_ctx, kdc->task->lp_ctx, "kadmin/changepw");
 489         if (!NT_STATUS_IS_OK(nt_status)) {
 490                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 491                                                        KRB5_KPASSWD_HARDERROR,
 492                                                        talloc_asprintf(mem_ctx,
 493                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n",
 494                                                                        nt_errstr(nt_status)),
 495                                                        &krb_priv_rep);
 496                 ap_rep.length = 0;
 497                 if (ret) {
 498                         goto reply;
 499                 }
 500                 talloc_free(tmp_ctx);
 501                 return ret;
 502         }
 503
 504         nt_status = gensec_set_credentials(gensec_security, server_credentials);
 505         if (!NT_STATUS_IS_OK(nt_status)) {
 506                 talloc_free(tmp_ctx);
 507                 return false;
 508         }
 509
 510         /* The kerberos PRIV packets include these addresses.  MIT
 511          * clients check that they are present */
 512         nt_status = gensec_set_peer_addr(gensec_security, peer_addr);
 513         if (!NT_STATUS_IS_OK(nt_status)) {
 514                 talloc_free(tmp_ctx);
 515                 return false;
 516         }
 517         nt_status = gensec_set_my_addr(gensec_security, my_addr);
 518         if (!NT_STATUS_IS_OK(nt_status)) {
 519                 talloc_free(tmp_ctx);
 520                 return false;
 521         }
 522
 523         /* We want the GENSEC wrap calls to generate PRIV tokens */
 524         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
 525
 526         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
 527         if (!NT_STATUS_IS_OK(nt_status)) {
 528                 talloc_free(tmp_ctx);
 529                 return false;
 530         }
 531
 532         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
 533         nt_status = gensec_update(gensec_security, tmp_ctx, ap_req, &ap_rep);
 534         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 535
 536                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 537                                                        KRB5_KPASSWD_HARDERROR,
 538                                                        talloc_asprintf(mem_ctx,
 539                                                                        "gensec_update failed: %s",
 540                                                                        nt_errstr(nt_status)),
 541                                                        &krb_priv_rep);
 542                 ap_rep.length = 0;
 543                 if (ret) {
 544                         goto reply;
 545                 }
 546                 talloc_free(tmp_ctx);
 547                 return ret;
 548         }
 549
 550         /* Extract the data from the KRB-PRIV half of the message */
 551         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
 552         if (!NT_STATUS_IS_OK(nt_status)) {
 553                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 554                                                        KRB5_KPASSWD_HARDERROR,
 555                                                        talloc_asprintf(mem_ctx,
 556                                                                        "gensec_unwrap failed: %s",
 557                                                                        nt_errstr(nt_status)),
 558                                                        &krb_priv_rep);
 559                 ap_rep.length = 0;
 560                 if (ret) {
 561                         goto reply;
 562                 }
 563                 talloc_free(tmp_ctx);
 564                 return ret;
 565         }
 566
 567         /* Figure out something to do with it (probably changing a password...) */
 568         ret = kpasswd_process_request(kdc, tmp_ctx,
 569                                       gensec_security,
 570                                       version,
 571                                       &kpasswd_req, &kpasswd_rep);
 572         if (!ret) {
 573                 /* Argh! */
 574                 return false;
 575         }
 576
 577         /* And wrap up the reply: This ensures that the error message
 578          * or success can be verified by the client */
 579         nt_status = gensec_wrap(gensec_security, tmp_ctx,
 580                                 &kpasswd_rep, &krb_priv_rep);
 581         if (!NT_STATUS_IS_OK(nt_status)) {
 582                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 583                                                        KRB5_KPASSWD_HARDERROR,
 584                                                        talloc_asprintf(mem_ctx,
 585                                                                        "gensec_wrap failed: %s",
 586                                                                        nt_errstr(nt_status)),
 587                                                        &krb_priv_rep);
 588                 ap_rep.length = 0;
 589                 if (ret) {
 590                         goto reply;
 591                 }
 592                 talloc_free(tmp_ctx);
 593                 return ret;
 594         }
 595
 596 reply:
 597         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
 598         if (!reply->data) {
 599                 return false;
 600         }
 601
 602         RSSVAL(reply->data, 0, reply->length);
 603         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
 604         RSSVAL(reply->data, 4, ap_rep.length);
 605         memcpy(reply->data + header_len,
 606                ap_rep.data,
 607                ap_rep.length);
 608         memcpy(reply->data + header_len + ap_rep.length,
 609                krb_priv_rep.data,
 610                krb_priv_rep.length);
 611
 612         talloc_free(tmp_ctx);
 613         return ret;
 614 }
 615