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 "kdc/kdc.h"
  28 #include "system/network.h"
  29 #include "lib/util/dlinklist.h"
  30 #include "lib/ldb/include/ldb.h"
  31 #include "heimdal/lib/krb5/krb5_locl.h"
  32 #include "heimdal/lib/krb5/krb5-private.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "auth/credentials/credentials.h"
  35 #include "auth/credentials/credentials_krb5.h"
  36 #include "auth/auth.h"
  37 #include "dsdb/samdb/samdb.h"
  38 #include "rpc_server/dcerpc_server.h"
  39 #include "rpc_server/samr/proto.h"
  40 #include "libcli/security/security.h"
  41
  42 /* hold information about one kdc socket */
  43 struct kpasswd_socket {
  44         struct socket_context *sock;
  45         struct kdc_server *kdc;
  46         struct fd_event *fde;
  47
  48         /* a queue of outgoing replies that have been deferred */
  49         struct kdc_reply *send_queue;
  50 };
  51
  52 /* Return true if there is a valid error packet formed in the error_blob */
  53 static BOOL kpasswdd_make_error_reply(struct kdc_server *kdc,
  54                                      TALLOC_CTX *mem_ctx,
  55                                      uint16_t result_code,
  56                                      const char *error_string,
  57                                      DATA_BLOB *error_blob)
  58 {
  59         char *error_string_utf8;
  60         ssize_t len;
  61
  62         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
  63
  64         len = push_utf8_talloc(mem_ctx, &error_string_utf8, error_string);
  65         if (len == -1) {
  66                 return False;
  67         }
  68
  69         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
  70         if (!error_blob->data) {
  71                 return False;
  72         }
  73         RSSVAL(error_blob->data, 0, result_code);
  74         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
  75         return True;
  76 }
  77
  78 /* Return true if there is a valid error packet formed in the error_blob */
  79 static BOOL kpasswdd_make_unauth_error_reply(struct kdc_server *kdc,
  80                                             TALLOC_CTX *mem_ctx,
  81                                             uint16_t result_code,
  82                                             const char *error_string,
  83                                             DATA_BLOB *error_blob)
  84 {
  85         BOOL ret;
  86         int kret;
  87         DATA_BLOB error_bytes;
  88         krb5_data k5_error_bytes, k5_error_blob;
  89         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string,
  90                                        &error_bytes);
  91         if (!ret) {
  92                 return False;
  93         }
  94         k5_error_bytes.data = error_bytes.data;
  95         k5_error_bytes.length = error_bytes.length;
  96         kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
  97                              result_code, NULL, &k5_error_bytes,
  98                              NULL, NULL, NULL, NULL, &k5_error_blob);
  99         if (kret) {
 100                 return False;
 101         }
 102         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
 103         krb5_data_free(&k5_error_blob);
 104         if (!error_blob->data) {
 105                 return False;
 106         }
 107         return True;
 108 }
 109
 110 static BOOL kpasswd_make_pwchange_reply(struct kdc_server *kdc,
 111                                         TALLOC_CTX *mem_ctx,
 112                                         NTSTATUS status,
 113                                         enum samr_RejectReason reject_reason,
 114                                         struct samr_DomInfo1 *dominfo,
 115                                         DATA_BLOB *error_blob)
 116 {
 117         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
 118                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 119                                                 KRB5_KPASSWD_ACCESSDENIED,
 120                                                 "No such user when changing password",
 121                                                 error_blob);
 122         }
 123         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 124                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 125                                                 KRB5_KPASSWD_ACCESSDENIED,
 126                                                 "Not permitted to change password",
 127                                                 error_blob);
 128         }
 129         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
 130                 const char *reject_string;
 131                 switch (reject_reason) {
 132                 case SAMR_REJECT_TOO_SHORT:
 133                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long",
 134                                                         dominfo->min_password_length);
 135                         break;
 136                 case SAMR_REJECT_COMPLEXITY:
 137                         reject_string = "Password does not meet complexity requirements";
 138                         break;
 139                 case SAMR_REJECT_IN_HISTORY:
 140                         reject_string = "Password is already in password history";
 141                         break;
 142                 case SAMR_REJECT_OTHER:
 143                 default:
 144                         reject_string = talloc_asprintf(mem_ctx, "Password must be at least %d characters long, and cannot match any of your %d previous passwords",
 145                                                         dominfo->min_password_length, dominfo->password_history_length);
 146                         break;
 147                 }
 148                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 149                                                 KRB5_KPASSWD_SOFTERROR,
 150                                                 reject_string,
 151                                                 error_blob);
 152         }
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 155                                                  KRB5_KPASSWD_HARDERROR,
 156                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
 157                                                  error_blob);
 158
 159         }
 160         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
 161                                         "Password changed",
 162                                         error_blob);
 163 }
 164
 165 /*
 166    A user password change
 167
 168    Return true if there is a valid error packet (or sucess) formed in
 169    the error_blob
 170 */
 171 static BOOL kpasswdd_change_password(struct kdc_server *kdc,
 172                                      TALLOC_CTX *mem_ctx,
 173                                      struct auth_session_info *session_info,
 174                                      const char *password,
 175                                      DATA_BLOB *reply)
 176 {
 177         NTSTATUS status;
 178         enum samr_RejectReason reject_reason;
 179         struct samr_DomInfo1 *dominfo;
 180         struct ldb_context *samdb;
 181
 182         samdb = samdb_connect(mem_ctx, system_session(mem_ctx));
 183         if (!samdb) {
 184                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 185                                                 KRB5_KPASSWD_HARDERROR,
 186                                                 "Failed to open samdb",
 187                                                 reply);
 188         }
 189
 190         DEBUG(3, ("Changing password of %s\\%s (%s)\n",
 191                   session_info->server_info->domain_name,
 192                   session_info->server_info->account_name,
 193                   dom_sid_string(mem_ctx, session_info->security_token->user_sid)));
 194
 195         /* User password change */
 196         status = samdb_set_password_sid(samdb, mem_ctx,
 197                                         session_info->security_token->user_sid,
 198                                         password, NULL, NULL,
 199                                         True, /* this is a user password change */
 200                                         True, /* run restriction tests */
 201                                         &reject_reason,
 202                                         &dominfo);
 203         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 204                                            status,
 205                                            reject_reason,
 206                                            dominfo,
 207                                            reply);
 208
 209 }
 210
 211 static BOOL kpasswd_process_request(struct kdc_server *kdc,
 212                                     TALLOC_CTX *mem_ctx,
 213                                     struct gensec_security *gensec_security,
 214                                     uint16_t version,
 215                                     DATA_BLOB *input,
 216                                     DATA_BLOB *reply)
 217 {
 218         struct auth_session_info *session_info;
 219         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
 220                                                  &session_info))) {
 221                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 222                                                 KRB5_KPASSWD_HARDERROR,
 223                                                 "gensec_session_info failed!",
 224                                                 reply);
 225         }
 226
 227         switch (version) {
 228         case KRB5_KPASSWD_VERS_CHANGEPW:
 229         {
 230                 char *password = talloc_strndup(mem_ctx, (const char *)input->data, input->length);
 231                 if (!password) {
 232                         return False;
 233                 }
 234                 return kpasswdd_change_password(kdc, mem_ctx, session_info,
 235                                                 password, reply);
 236                 break;
 237         }
 238         case KRB5_KPASSWD_VERS_SETPW:
 239         {
 240                 NTSTATUS status;
 241                 enum samr_RejectReason reject_reason = SAMR_REJECT_OTHER;
 242                 struct samr_DomInfo1 *dominfo = NULL;
 243                 struct ldb_context *samdb;
 244                 struct ldb_message *msg;
 245                 krb5_context context = kdc->smb_krb5_context->krb5_context;
 246
 247                 ChangePasswdDataMS chpw;
 248                 char *password;
 249
 250                 krb5_principal principal;
 251                 char *set_password_on_princ;
 252                 struct ldb_dn *set_password_on_dn;
 253
 254                 size_t len;
 255                 int ret;
 256
 257                 msg = ldb_msg_new(mem_ctx);
 258                 if (!msg) {
 259                         return False;
 260                 }
 261
 262                 ret = decode_ChangePasswdDataMS(input->data, input->length,
 263                                                 &chpw, &len);
 264                 if (ret) {
 265                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 266                                                         KRB5_KPASSWD_MALFORMED,
 267                                                         "failed to decode password change structure",
 268                                                         reply);
 269                 }
 270
 271                 password = talloc_strndup(mem_ctx, chpw.newpasswd.data,
 272                                           chpw.newpasswd.length);
 273                 if (!password) {
 274                         free_ChangePasswdDataMS(&chpw);
 275                         return False;
 276                 }
 277                 if ((chpw.targname && !chpw.targrealm)
 278                     || (!chpw.targname && chpw.targrealm)) {
 279                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 280                                                         KRB5_KPASSWD_MALFORMED,
 281                                                         "Realm and principal must be both present, or neither present",
 282                                                         reply);
 283                 }
 284                 if (chpw.targname && chpw.targrealm) {
 285                         if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context,
 286                                                                &principal, *chpw.targname,
 287                                                                *chpw.targrealm) != 0) {
 288                                 free_ChangePasswdDataMS(&chpw);
 289                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 290                                                                 KRB5_KPASSWD_MALFORMED,
 291                                                                 "failed to extract principal to set",
 292                                                                 reply);
 293
 294                         }
 295                 } else {
 296                         free_ChangePasswdDataMS(&chpw);
 297                         return kpasswdd_change_password(kdc, mem_ctx, session_info,
 298                                                         password, reply);
 299                 }
 300                 free_ChangePasswdDataMS(&chpw);
 301
 302                 if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
 303                         krb5_free_principal(context, principal);
 304                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 305                                                         KRB5_KPASSWD_MALFORMED,
 306                                                         "krb5_unparse_name failed!",
 307                                                         reply);
 308                 }
 309
 310                 krb5_free_principal(context, principal);
 311
 312                 samdb = samdb_connect(mem_ctx, session_info);
 313                 if (!samdb) {
 314                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 315                                                          KRB5_KPASSWD_HARDERROR,
 316                                                          "Unable to open database!",
 317                                                          reply);
 318                 }
 319
 320                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
 321                           session_info->server_info->domain_name,
 322                           session_info->server_info->account_name,
 323                           dom_sid_string(mem_ctx, session_info->security_token->user_sid),
 324                           set_password_on_princ));
 325                 ret = ldb_transaction_start(samdb);
 326                 if (ret) {
 327                         status = NT_STATUS_TRANSACTION_ABORTED;
 328                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 329                                                            status,
 330                                                            SAMR_REJECT_OTHER,
 331                                                            NULL,
 332                                                            reply);
 333                 }
 334
 335                 status = crack_user_principal_name(samdb, mem_ctx,
 336                                                    set_password_on_princ,
 337                                                    &set_password_on_dn, NULL);
 338                 free(set_password_on_princ);
 339                 if (!NT_STATUS_IS_OK(status)) {
 340                         ldb_transaction_cancel(samdb);
 341                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 342                                                            status,
 343                                                            SAMR_REJECT_OTHER,
 344                                                            NULL,
 345                                                            reply);
 346                 }
 347
 348                 msg = ldb_msg_new(mem_ctx);
 349                 if (msg == NULL) {
 350                         ldb_transaction_cancel(samdb);
 351                         status = NT_STATUS_NO_MEMORY;
 352                 } else {
 353                         msg->dn = ldb_dn_copy(msg, set_password_on_dn);
 354                         if (!msg->dn) {
 355                                 status = NT_STATUS_NO_MEMORY;
 356                         }
 357                 }
 358
 359                 if (NT_STATUS_IS_OK(status)) {
 360                         /* Admin password set */
 361                         status = samdb_set_password(samdb, mem_ctx,
 362                                                     set_password_on_dn, NULL,
 363                                                     msg, password, NULL, NULL,
 364                                                     False, /* this is not a user password change */
 365                                                     True, /* run restriction tests */
 366                                                     &reject_reason, &dominfo);
 367                 }
 368
 369                 if (NT_STATUS_IS_OK(status)) {
 370                         /* modify the samdb record */
 371                         ret = samdb_replace(samdb, mem_ctx, msg);
 372                         if (ret != 0) {
 373                                 DEBUG(2,("Failed to modify record to set password on %s: %s\n",
 374                                          ldb_dn_get_linearized(msg->dn),
 375                                          ldb_errstring(samdb)));
 376                                 status = NT_STATUS_ACCESS_DENIED;
 377                         }
 378                 }
 379                 if (NT_STATUS_IS_OK(status)) {
 380                         ret = ldb_transaction_commit(samdb);
 381                         if (ret != 0) {
 382                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
 383                                          ldb_dn_get_linearized(msg->dn),
 384                                          ldb_errstring(samdb)));
 385                                 status = NT_STATUS_TRANSACTION_ABORTED;
 386                         }
 387                 } else {
 388                         ldb_transaction_cancel(samdb);
 389                 }
 390                 return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 391                                                    status,
 392                                                    reject_reason,
 393                                                    dominfo,
 394                                                    reply);
 395         }
 396         default:
 397                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 398                                                  KRB5_KPASSWD_BAD_VERSION,
 399                                                  talloc_asprintf(mem_ctx,
 400                                                                  "Protocol version %u not supported",
 401                                                                  version),
 402                                                  reply);
 403         }
 404         return True;
 405 }
 406
 407 BOOL kpasswdd_process(struct kdc_server *kdc,
 408                       TALLOC_CTX *mem_ctx,
 409                       DATA_BLOB *input,
 410                       DATA_BLOB *reply,
 411                       struct socket_address *peer_addr,
 412                       struct socket_address *my_addr,
 413                       int datagram_reply)
 414 {
 415         BOOL ret;
 416         const uint16_t header_len = 6;
 417         uint16_t len;
 418         uint16_t ap_req_len;
 419         uint16_t krb_priv_len;
 420         uint16_t version;
 421         NTSTATUS nt_status;
 422         DATA_BLOB ap_req, krb_priv_req;
 423         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
 424         DATA_BLOB ap_rep = data_blob(NULL, 0);
 425         DATA_BLOB kpasswd_req, kpasswd_rep;
 426         struct cli_credentials *server_credentials;
 427         struct gensec_security *gensec_security;
 428         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 429
 430         if (!tmp_ctx) {
 431                 return False;
 432         }
 433
 434         /* Be parinoid.  We need to ensure we don't just let the
 435          * caller lead us into a buffer overflow */
 436         if (input->length <= header_len) {
 437                 talloc_free(tmp_ctx);
 438                 return False;
 439         }
 440
 441         len = RSVAL(input->data, 0);
 442         if (input->length != len) {
 443                 talloc_free(tmp_ctx);
 444                 return False;
 445         }
 446
 447         /* There are two different versions of this protocol so far,
 448          * plus others in the standards pipe.  Fortunetly they all
 449          * take a very similar framing */
 450         version = RSVAL(input->data, 2);
 451         ap_req_len = RSVAL(input->data, 4);
 452         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
 453                 talloc_free(tmp_ctx);
 454                 return False;
 455         }
 456
 457         krb_priv_len = len - ap_req_len;
 458         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
 459         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
 460
 461         nt_status = gensec_server_start(tmp_ctx, kdc->task->event_ctx, kdc->task->msg_ctx, &gensec_security);
 462         if (!NT_STATUS_IS_OK(nt_status)) {
 463                 talloc_free(tmp_ctx);
 464                 return False;
 465         }
 466
 467         server_credentials = cli_credentials_init(tmp_ctx);
 468         if (!server_credentials) {
 469                 DEBUG(1, ("Failed to init server credentials\n"));
 470                 return False;
 471         }
 472
 473         /* We want the credentials subsystem to use the krb5 context
 474          * we already have, rather than a new context */
 475         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
 476         cli_credentials_set_conf(server_credentials);
 477         nt_status = cli_credentials_set_stored_principal(server_credentials, "kadmin/changepw");
 478         if (!NT_STATUS_IS_OK(nt_status)) {
 479                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 480                                                        KRB5_KPASSWD_HARDERROR,
 481                                                        talloc_asprintf(mem_ctx,
 482                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n",
 483                                                                        nt_errstr(nt_status)),
 484                                                        &krb_priv_rep);
 485                 ap_rep.length = 0;
 486                 if (ret) {
 487                         goto reply;
 488                 }
 489                 talloc_free(tmp_ctx);
 490                 return ret;
 491         }
 492
 493         nt_status = gensec_set_credentials(gensec_security, server_credentials);
 494         if (!NT_STATUS_IS_OK(nt_status)) {
 495                 talloc_free(tmp_ctx);
 496                 return False;
 497         }
 498
 499         /* The kerberos PRIV packets include these addresses.  MIT
 500          * clients check that they are present */
 501         nt_status = gensec_set_peer_addr(gensec_security, peer_addr);
 502         if (!NT_STATUS_IS_OK(nt_status)) {
 503                 talloc_free(tmp_ctx);
 504                 return False;
 505         }
 506         nt_status = gensec_set_my_addr(gensec_security, my_addr);
 507         if (!NT_STATUS_IS_OK(nt_status)) {
 508                 talloc_free(tmp_ctx);
 509                 return False;
 510         }
 511
 512         /* We want the GENSEC wrap calls to generate PRIV tokens */
 513         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
 514
 515         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
 516         if (!NT_STATUS_IS_OK(nt_status)) {
 517                 talloc_free(tmp_ctx);
 518                 return False;
 519         }
 520
 521         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
 522         nt_status = gensec_update(gensec_security, tmp_ctx, ap_req, &ap_rep);
 523         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 524
 525                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 526                                                        KRB5_KPASSWD_HARDERROR,
 527                                                        talloc_asprintf(mem_ctx,
 528                                                                        "gensec_update failed: %s",
 529                                                                        nt_errstr(nt_status)),
 530                                                        &krb_priv_rep);
 531                 ap_rep.length = 0;
 532                 if (ret) {
 533                         goto reply;
 534                 }
 535                 talloc_free(tmp_ctx);
 536                 return ret;
 537         }
 538
 539         /* Extract the data from the KRB-PRIV half of the message */
 540         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
 541         if (!NT_STATUS_IS_OK(nt_status)) {
 542                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 543                                                        KRB5_KPASSWD_HARDERROR,
 544                                                        talloc_asprintf(mem_ctx,
 545                                                                        "gensec_unwrap failed: %s",
 546                                                                        nt_errstr(nt_status)),
 547                                                        &krb_priv_rep);
 548                 ap_rep.length = 0;
 549                 if (ret) {
 550                         goto reply;
 551                 }
 552                 talloc_free(tmp_ctx);
 553                 return ret;
 554         }
 555
 556         /* Figure out something to do with it (probably changing a password...) */
 557         ret = kpasswd_process_request(kdc, tmp_ctx,
 558                                       gensec_security,
 559                                       version,
 560                                       &kpasswd_req, &kpasswd_rep);
 561         if (!ret) {
 562                 /* Argh! */
 563                 return False;
 564         }
 565
 566         /* And wrap up the reply: This ensures that the error message
 567          * or success can be verified by the client */
 568         nt_status = gensec_wrap(gensec_security, tmp_ctx,
 569                                 &kpasswd_rep, &krb_priv_rep);
 570         if (!NT_STATUS_IS_OK(nt_status)) {
 571                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 572                                                        KRB5_KPASSWD_HARDERROR,
 573                                                        talloc_asprintf(mem_ctx,
 574                                                                        "gensec_wrap failed: %s",
 575                                                                        nt_errstr(nt_status)),
 576                                                        &krb_priv_rep);
 577                 ap_rep.length = 0;
 578                 if (ret) {
 579                         goto reply;
 580                 }
 581                 talloc_free(tmp_ctx);
 582                 return ret;
 583         }
 584
 585 reply:
 586         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
 587         if (!reply->data) {
 588                 return False;
 589         }
 590
 591         RSSVAL(reply->data, 0, reply->length);
 592         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
 593         RSSVAL(reply->data, 4, ap_rep.length);
 594         memcpy(reply->data + header_len,
 595                ap_rep.data,
 596                ap_rep.length);
 597         memcpy(reply->data + header_len + ap_rep.length,
 598                krb_priv_rep.data,
 599                krb_priv_rep.length);
 600
 601         talloc_free(tmp_ctx);
 602         return ret;
 603 }
 604