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