source4/kdc/kpasswd-heimdal.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 "auth/gensec/gensec.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "auth/auth.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "../lib/util/util_ldb.h"
  30 #include "libcli/security/security.h"
  31 #include "param/param.h"
  32 #include "kdc/kdc-server.h"
  33 #include "kdc/kdc-glue.h"
  34 #include "dsdb/common/util.h"
  35 #include "kdc/kpasswd_glue.h"
  36
  37 /* Return true if there is a valid error packet formed in the error_blob */
  38 static bool kpasswdd_make_error_reply(struct kdc_server *kdc,
  39                                      TALLOC_CTX *mem_ctx,
  40                                      uint16_t result_code,
  41                                      const char *error_string,
  42                                      DATA_BLOB *error_blob)
  43 {
  44         char *error_string_utf8;
  45         size_t len;
  46
  47         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
  48
  49         if (!push_utf8_talloc(mem_ctx, &error_string_utf8, error_string, &len)) {
  50                 return false;
  51         }
  52
  53         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
  54         if (!error_blob->data) {
  55                 return false;
  56         }
  57         RSSVAL(error_blob->data, 0, result_code);
  58         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
  59         return true;
  60 }
  61
  62 /* Return true if there is a valid error packet formed in the error_blob */
  63 static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc,
  64                                             TALLOC_CTX *mem_ctx,
  65                                             uint16_t result_code,
  66                                             const char *error_string,
  67                                             DATA_BLOB *error_blob)
  68 {
  69         bool ret;
  70         int kret;
  71         DATA_BLOB error_bytes;
  72         krb5_data k5_error_bytes, k5_error_blob;
  73         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string,
  74                                        &error_bytes);
  75         if (!ret) {
  76                 return false;
  77         }
  78         k5_error_bytes.data = error_bytes.data;
  79         k5_error_bytes.length = error_bytes.length;
  80         kret = smb_krb5_mk_error(kdc->smb_krb5_context->krb5_context,
  81                                  result_code,
  82                                  NULL,
  83                                  &k5_error_bytes,
  84                                  &k5_error_blob);
  85         if (kret) {
  86                 return false;
  87         }
  88         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
  89         smb_krb5_free_data_contents(kdc->smb_krb5_context->krb5_context,
  90                                     &k5_error_blob);
  91         if (!error_blob->data) {
  92                 return false;
  93         }
  94         return true;
  95 }
  96
  97 static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc,
  98                                         TALLOC_CTX *mem_ctx,
  99                                         NTSTATUS status,
 100                                         enum samPwdChangeReason reject_reason,
 101                                         struct samr_DomInfo1 *dominfo,
 102                                         DATA_BLOB *error_blob)
 103 {
 104         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
 105                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 106                                                 KRB5_KPASSWD_ACCESSDENIED,
 107                                                 "No such user when changing password",
 108                                                 error_blob);
 109         }
 110         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 111                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 112                                                 KRB5_KPASSWD_ACCESSDENIED,
 113                                                 "Not permitted to change password",
 114                                                 error_blob);
 115         }
 116         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
 117                 const char *reject_string;
 118                 switch (reject_reason) {
 119                 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
 120                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long.",
 121                                                         dominfo->min_password_length);
 122                         break;
 123                 case SAM_PWD_CHANGE_NOT_COMPLEX:
 124                         reject_string = "Password does not meet complexity requirements";
 125                         break;
 126                 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
 127                         reject_string = talloc_asprintf(mem_ctx, "Password is already in password history.  New password must not match any of your %d previous passwords.",
 128                                                         dominfo->password_history_length);
 129                         break;
 130                 default:
 131                         reject_string = "Password change rejected, password changes may not be permitted on this account, or the minimum password age may not have elapsed.";
 132                         break;
 133                 }
 134                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 135                                                 KRB5_KPASSWD_SOFTERROR,
 136                                                 reject_string,
 137                                                 error_blob);
 138         }
 139         if (!NT_STATUS_IS_OK(status)) {
 140                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 141                                                  KRB5_KPASSWD_HARDERROR,
 142                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
 143                                                  error_blob);
 144
 145         }
 146         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
 147                                         "Password changed",
 148                                         error_blob);
 149 }
 150
 151 /*
 152    A user password change
 153
 154    Return true if there is a valid error packet (or success) formed in
 155    the error_blob
 156 */
 157 static bool kpasswdd_change_password(struct kdc_server *kdc,
 158                                      TALLOC_CTX *mem_ctx,
 159                                      struct auth_session_info *session_info,
 160                                      const DATA_BLOB *password,
 161                                      DATA_BLOB *reply)
 162 {
 163         NTSTATUS status;
 164         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 165         enum samPwdChangeReason reject_reason;
 166         struct samr_DomInfo1 *dominfo;
 167         const char *error_string;
 168
 169         status = samdb_kpasswd_change_password(mem_ctx,
 170                                                kdc->task->lp_ctx,
 171                                                kdc->task->event_ctx,
 172                                                kdc->samdb,
 173                                                session_info,
 174                                                password,
 175                                                &reject_reason,
 176                                                &dominfo,
 177                                                &error_string,
 178                                                &result);
 179         if (!NT_STATUS_IS_OK(status)) {
 180                 return kpasswdd_make_error_reply(kdc,
 181                                                  mem_ctx,
 182                                                  KRB5_KPASSWD_ACCESSDENIED,
 183                                                  error_string,
 184                                                  reply);
 185         }
 186
 187         return kpasswd_make_pwchange_reply(kdc,
 188                                            mem_ctx,
 189                                            result,
 190                                            reject_reason,
 191                                            dominfo,
 192                                            reply);
 193 }
 194
 195 static bool kpasswd_process_request(struct kdc_server *kdc,
 196                                     TALLOC_CTX *mem_ctx,
 197                                     struct gensec_security *gensec_security,
 198                                     uint16_t version,
 199                                     DATA_BLOB *input,
 200                                     DATA_BLOB *reply)
 201 {
 202         struct auth_session_info *session_info;
 203         size_t pw_len;
 204
 205         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
 206                                                  mem_ctx,
 207                                                  &session_info))) {
 208                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 209                                                 KRB5_KPASSWD_HARDERROR,
 210                                                 "gensec_session_info failed!",
 211                                                 reply);
 212         }
 213
 214         switch (version) {
 215         case KRB5_KPASSWD_VERS_CHANGEPW:
 216         {
 217                 DATA_BLOB password;
 218                 if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
 219                                                CH_UTF8, CH_UTF16,
 220                                                (const char *)input->data,
 221                                                input->length,
 222                                                (void **)&password.data, &pw_len)) {
 223                         return false;
 224                 }
 225                 password.length = pw_len;
 226
 227                 return kpasswdd_change_password(kdc, mem_ctx, session_info,
 228                                                 &password, reply);
 229         }
 230         case KRB5_KPASSWD_VERS_SETPW:
 231         {
 232                 NTSTATUS status;
 233                 enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
 234                 struct samr_DomInfo1 *dominfo = NULL;
 235                 struct ldb_context *samdb;
 236                 krb5_context context = kdc->smb_krb5_context->krb5_context;
 237
 238                 ChangePasswdDataMS chpw;
 239                 DATA_BLOB password;
 240
 241                 krb5_principal principal;
 242                 char *set_password_on_princ;
 243                 struct ldb_dn *set_password_on_dn;
 244                 bool service_principal_name = false;
 245
 246                 size_t len;
 247                 int ret;
 248
 249                 ret = decode_ChangePasswdDataMS(input->data, input->length,
 250                                                 &chpw, &len);
 251                 if (ret) {
 252                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 253                                                         KRB5_KPASSWD_MALFORMED,
 254                                                         "failed to decode password change structure",
 255                                                         reply);
 256                 }
 257
 258                 if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
 259                                                CH_UTF8, CH_UTF16,
 260                                                (const char *)chpw.newpasswd.data,
 261                                                chpw.newpasswd.length,
 262                                                (void **)&password.data, &pw_len)) {
 263                         free_ChangePasswdDataMS(&chpw);
 264                         return false;
 265                 }
 266
 267                 password.length = pw_len;
 268
 269                 if ((chpw.targname && !chpw.targrealm)
 270                     || (!chpw.targname && chpw.targrealm)) {
 271                         free_ChangePasswdDataMS(&chpw);
 272                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 273                                                         KRB5_KPASSWD_MALFORMED,
 274                                                         "Realm and principal must be both present, or neither present",
 275                                                         reply);
 276                 }
 277                 if (chpw.targname && chpw.targrealm) {
 278                         ret = krb5_build_principal_ext(kdc->smb_krb5_context->krb5_context,
 279                                                        &principal,
 280                                                        strlen(*chpw.targrealm),
 281                                                        *chpw.targrealm, 0);
 282                         if (ret) {
 283                                 free_ChangePasswdDataMS(&chpw);
 284                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 285                                                                 KRB5_KPASSWD_MALFORMED,
 286                                                                 "failed to get principal",
 287                                                                 reply);
 288                         }
 289                         if (copy_PrincipalName(chpw.targname, &principal->name)) {
 290                                 free_ChangePasswdDataMS(&chpw);
 291                                 krb5_free_principal(context, principal);
 292                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 293                                                                 KRB5_KPASSWD_MALFORMED,
 294                                                                 "failed to extract principal to set",
 295                                                                 reply);
 296                         }
 297                 } else {
 298                         free_ChangePasswdDataMS(&chpw);
 299                         return kpasswdd_change_password(kdc, mem_ctx, session_info,
 300                                                         &password, reply);
 301                 }
 302                 free_ChangePasswdDataMS(&chpw);
 303
 304                 if (principal->name.name_string.len >= 2) {
 305                         service_principal_name = true;
 306
 307                         /* We use this, rather than 'no realm' flag,
 308                          * as we don't want to accept a password
 309                          * change on a principal from another realm */
 310
 311                         if (krb5_unparse_name_short(context, principal, &set_password_on_princ) != 0) {
 312                                 krb5_free_principal(context, principal);
 313                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 314                                                                  KRB5_KPASSWD_MALFORMED,
 315                                                                  "krb5_unparse_name failed!",
 316                                                                  reply);
 317                         }
 318                 } else {
 319                         if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
 320                                 krb5_free_principal(context, principal);
 321                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 322                                                                  KRB5_KPASSWD_MALFORMED,
 323                                                                  "krb5_unparse_name failed!",
 324                                                                  reply);
 325                         }
 326                 }
 327                 krb5_free_principal(context, principal);
 328
 329                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info, 0);
 330                 if (!samdb) {
 331                         free(set_password_on_princ);
 332                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 333                                                          KRB5_KPASSWD_HARDERROR,
 334                                                          "Unable to open database!",
 335                                                          reply);
 336                 }
 337
 338                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
 339                           session_info->info->domain_name,
 340                           session_info->info->account_name,
 341                           dom_sid_string(mem_ctx, &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
 342                           set_password_on_princ));
 343                 ret = ldb_transaction_start(samdb);
 344                 if (ret != LDB_SUCCESS) {
 345                         free(set_password_on_princ);
 346                         status = NT_STATUS_TRANSACTION_ABORTED;
 347                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 348                                                            status,
 349                                                            SAM_PWD_CHANGE_NO_ERROR,
 350                                                            NULL,
 351                                                            reply);
 352                 }
 353
 354                 if (service_principal_name) {
 355                         status = crack_service_principal_name(samdb, mem_ctx,
 356                                                               set_password_on_princ,
 357                                                               &set_password_on_dn, NULL);
 358                 } else {
 359                         status = crack_user_principal_name(samdb, mem_ctx,
 360                                                            set_password_on_princ,
 361                                                            &set_password_on_dn, NULL);
 362                 }
 363                 free(set_password_on_princ);
 364                 if (!NT_STATUS_IS_OK(status)) {
 365                         ldb_transaction_cancel(samdb);
 366                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 367                                                            status,
 368                                                            SAM_PWD_CHANGE_NO_ERROR,
 369                                                            NULL,
 370                                                            reply);
 371                 }
 372
 373                 if (NT_STATUS_IS_OK(status)) {
 374                         /* Admin password set */
 375                         status = samdb_set_password(samdb, mem_ctx,
 376                                                     set_password_on_dn, NULL,
 377                                                     &password, NULL, NULL,
 378                                                     NULL, NULL, /* this is not a user password change */
 379                                                     &reject_reason, &dominfo);
 380                 }
 381
 382                 if (NT_STATUS_IS_OK(status)) {
 383                         ret = ldb_transaction_commit(samdb);
 384                         if (ret != LDB_SUCCESS) {
 385                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
 386                                          ldb_dn_get_linearized(set_password_on_dn),
 387                                          ldb_errstring(samdb)));
 388                                 status = NT_STATUS_TRANSACTION_ABORTED;
 389                         }
 390                 } else {
 391                         ldb_transaction_cancel(samdb);
 392                 }
 393                 return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 394                                                    status,
 395                                                    reject_reason,
 396                                                    dominfo,
 397                                                    reply);
 398         }
 399         default:
 400                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 401                                                  KRB5_KPASSWD_BAD_VERSION,
 402                                                  talloc_asprintf(mem_ctx,
 403                                                                  "Protocol version %u not supported",
 404                                                                  version),
 405                                                  reply);
 406         }
 407 }
 408
 409 kdc_code kpasswdd_process(struct kdc_server *kdc,
 410                           TALLOC_CTX *mem_ctx,
 411                           DATA_BLOB *input,
 412                           DATA_BLOB *reply,
 413                           struct tsocket_address *peer_addr,
 414                           struct tsocket_address *my_addr,
 415                           int datagram_reply)
 416 {
 417         bool ret;
 418         const uint16_t header_len = 6;
 419         uint16_t len;
 420         uint16_t ap_req_len;
 421         uint16_t krb_priv_len;
 422         uint16_t version;
 423         NTSTATUS nt_status;
 424         DATA_BLOB ap_req, krb_priv_req;
 425         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
 426         DATA_BLOB ap_rep = data_blob(NULL, 0);
 427         DATA_BLOB kpasswd_req, kpasswd_rep;
 428         struct cli_credentials *server_credentials;
 429         struct gensec_security *gensec_security;
 430         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 431
 432         char *keytab_name;
 433
 434         if (!tmp_ctx) {
 435                 return KDC_ERROR;
 436         }
 437
 438         if (kdc->am_rodc) {
 439                 talloc_free(tmp_ctx);
 440                 return KDC_PROXY_REQUEST;
 441         }
 442
 443         /* Be parinoid.  We need to ensure we don't just let the
 444          * caller lead us into a buffer overflow */
 445         if (input->length <= header_len) {
 446                 talloc_free(tmp_ctx);
 447                 return KDC_ERROR;
 448         }
 449
 450         len = RSVAL(input->data, 0);
 451         if (input->length != len) {
 452                 talloc_free(tmp_ctx);
 453                 return KDC_ERROR;
 454         }
 455
 456         /* There are two different versions of this protocol so far,
 457          * plus others in the standards pipe.  Fortunetly they all
 458          * take a very similar framing */
 459         version = RSVAL(input->data, 2);
 460         ap_req_len = RSVAL(input->data, 4);
 461         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
 462                 talloc_free(tmp_ctx);
 463                 return KDC_ERROR;
 464         }
 465
 466         krb_priv_len = len - ap_req_len;
 467         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
 468         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
 469
 470         server_credentials = cli_credentials_init(tmp_ctx);
 471         if (!server_credentials) {
 472                 DEBUG(1, ("Failed to init server credentials\n"));
 473                 talloc_free(tmp_ctx);
 474                 return KDC_ERROR;
 475         }
 476
 477         /* We want the credentials subsystem to use the krb5 context
 478          * we already have, rather than a new context */
 479         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
 480         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
 481
 482         keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->base_ctx);
 483
 484         cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
 485         ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
 486         if (ret != 0) {
 487                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 488                                                        KRB5_KPASSWD_HARDERROR,
 489                                                        talloc_asprintf(mem_ctx,
 490                                                                        "Failed to obtain server credentials for kadmin/changepw!"),
 491                                                        &krb_priv_rep);
 492                 ap_rep.length = 0;
 493                 if (ret) {
 494                         goto reply;
 495                 }
 496                 talloc_free(tmp_ctx);
 497                 return ret;
 498         }
 499
 500         /* We don't strictly need to call this wrapper, and could call
 501          * gensec_server_start directly, as we have no need for NTLM
 502          * and we have a PAC, but this ensures that the wrapper can be
 503          * safely extended for other helpful things in future */
 504         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx,
 505                                               kdc->task->msg_ctx,
 506                                               kdc->task->lp_ctx,
 507                                               server_credentials,
 508                                               "kpasswd",
 509                                               &gensec_security);
 510         if (!NT_STATUS_IS_OK(nt_status)) {
 511                 talloc_free(tmp_ctx);
 512                 return KDC_ERROR;
 513         }
 514
 515         /* The kerberos PRIV packets include these addresses.  MIT
 516          * clients check that they are present */
 517 #if 0
 518         /* Skip this part for now, it breaks with a NetAPP filer and
 519          * in any case where the client address is behind NAT.  If
 520          * older MIT clients need this, we might have to insert more
 521          * complex code */
 522
 523         nt_status = gensec_set_remote_address(gensec_security, peer_addr);
 524         if (!NT_STATUS_IS_OK(nt_status)) {
 525                 talloc_free(tmp_ctx);
 526                 return KDC_ERROR;
 527         }
 528 #endif
 529
 530         nt_status = gensec_set_local_address(gensec_security, my_addr);
 531         if (!NT_STATUS_IS_OK(nt_status)) {
 532                 talloc_free(tmp_ctx);
 533                 return KDC_ERROR;
 534         }
 535
 536         /* We want the GENSEC wrap calls to generate PRIV tokens */
 537         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
 538
 539         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
 540         if (!NT_STATUS_IS_OK(nt_status)) {
 541                 talloc_free(tmp_ctx);
 542                 return KDC_ERROR;
 543         }
 544
 545         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
 546         nt_status = gensec_update_ev(gensec_security, tmp_ctx, kdc->task->event_ctx, ap_req, &ap_rep);
 547         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 548
 549                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 550                                                        KRB5_KPASSWD_HARDERROR,
 551                                                        talloc_asprintf(mem_ctx,
 552                                                                        "gensec_update failed: %s",
 553                                                                        nt_errstr(nt_status)),
 554                                                        &krb_priv_rep);
 555                 ap_rep.length = 0;
 556                 if (ret) {
 557                         goto reply;
 558                 }
 559                 talloc_free(tmp_ctx);
 560                 return KDC_ERROR;
 561         }
 562
 563         /* Extract the data from the KRB-PRIV half of the message */
 564         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
 565         if (!NT_STATUS_IS_OK(nt_status)) {
 566                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 567                                                        KRB5_KPASSWD_HARDERROR,
 568                                                        talloc_asprintf(mem_ctx,
 569                                                                        "gensec_unwrap failed: %s",
 570                                                                        nt_errstr(nt_status)),
 571                                                        &krb_priv_rep);
 572                 ap_rep.length = 0;
 573                 if (ret) {
 574                         goto reply;
 575                 }
 576                 talloc_free(tmp_ctx);
 577                 return KDC_ERROR;
 578         }
 579
 580         /* Figure out something to do with it (probably changing a password...) */
 581         ret = kpasswd_process_request(kdc, tmp_ctx,
 582                                       gensec_security,
 583                                       version,
 584                                       &kpasswd_req, &kpasswd_rep);
 585         if (!ret) {
 586                 /* Argh! */
 587                 talloc_free(tmp_ctx);
 588                 return KDC_ERROR;
 589         }
 590
 591         /* And wrap up the reply: This ensures that the error message
 592          * or success can be verified by the client */
 593         nt_status = gensec_wrap(gensec_security, tmp_ctx,
 594                                 &kpasswd_rep, &krb_priv_rep);
 595         if (!NT_STATUS_IS_OK(nt_status)) {
 596                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 597                                                        KRB5_KPASSWD_HARDERROR,
 598                                                        talloc_asprintf(mem_ctx,
 599                                                                        "gensec_wrap failed: %s",
 600                                                                        nt_errstr(nt_status)),
 601                                                        &krb_priv_rep);
 602                 ap_rep.length = 0;
 603                 if (ret) {
 604                         goto reply;
 605                 }
 606                 talloc_free(tmp_ctx);
 607                 return KDC_ERROR;
 608         }
 609
 610 reply:
 611         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
 612         if (!reply->data) {
 613                 talloc_free(tmp_ctx);
 614                 return KDC_ERROR;
 615         }
 616
 617         RSSVAL(reply->data, 0, reply->length);
 618         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
 619         RSSVAL(reply->data, 4, ap_rep.length);
 620         memcpy(reply->data + header_len,
 621                ap_rep.data,
 622                ap_rep.length);
 623         memcpy(reply->data + header_len + ap_rep.length,
 624                krb_priv_rep.data,
 625                krb_priv_rep.length);
 626
 627         talloc_free(tmp_ctx);
 628         return KDC_OK;
 629 }