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 tevent_fd *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, &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 DATA_BLOB *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         ssize_t pw_len;
 223
 224         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
 225                                                  &session_info))) {
 226                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 227                                                 KRB5_KPASSWD_HARDERROR,
 228                                                 "gensec_session_info failed!",
 229                                                 reply);
 230         }
 231
 232         switch (version) {
 233         case KRB5_KPASSWD_VERS_CHANGEPW:
 234         {
 235                 DATA_BLOB password;
 236                 pw_len = convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx),
 237                                                CH_UTF8, CH_UTF16,
 238                                                (const char *)input->data,
 239                                                input->length,
 240                                                (void **)&password.data, false);
 241
 242                 if (pw_len == -1) {
 243                         return false;
 244                 }
 245                 password.length = pw_len;
 246
 247                 return kpasswdd_change_password(kdc, mem_ctx, session_info,
 248                                                 &password, reply);
 249                 break;
 250         }
 251         case KRB5_KPASSWD_VERS_SETPW:
 252         {
 253                 NTSTATUS status;
 254                 enum samr_RejectReason reject_reason = SAMR_REJECT_OTHER;
 255                 struct samr_DomInfo1 *dominfo = NULL;
 256                 struct ldb_context *samdb;
 257                 struct ldb_message *msg;
 258                 krb5_context context = kdc->smb_krb5_context->krb5_context;
 259
 260                 ChangePasswdDataMS chpw;
 261                 DATA_BLOB password;
 262
 263                 krb5_principal principal;
 264                 char *set_password_on_princ;
 265                 struct ldb_dn *set_password_on_dn;
 266
 267                 size_t len;
 268                 int ret;
 269
 270                 msg = ldb_msg_new(mem_ctx);
 271                 if (!msg) {
 272                         return false;
 273                 }
 274
 275                 ret = decode_ChangePasswdDataMS(input->data, input->length,
 276                                                 &chpw, &len);
 277                 if (ret) {
 278                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 279                                                         KRB5_KPASSWD_MALFORMED,
 280                                                         "failed to decode password change structure",
 281                                                         reply);
 282                 }
 283
 284                 pw_len = convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx),
 285                                                CH_UTF8, CH_UTF16,
 286                                                (const char *)chpw.newpasswd.data,
 287                                                chpw.newpasswd.length,
 288                                                (void **)&password.data, false);
 289                 if (pw_len == -1) {
 290                         free_ChangePasswdDataMS(&chpw);
 291                         return false;
 292                 }
 293
 294                 password.length = pw_len;
 295
 296                 if ((chpw.targname && !chpw.targrealm)
 297                     || (!chpw.targname && chpw.targrealm)) {
 298                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 299                                                         KRB5_KPASSWD_MALFORMED,
 300                                                         "Realm and principal must be both present, or neither present",
 301                                                         reply);
 302                 }
 303                 if (chpw.targname && chpw.targrealm) {
 304 #ifdef SAMBA4_INTERNAL_HEIMDAL
 305                         if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context,
 306                                                                &principal, *chpw.targname,
 307                                                                *chpw.targrealm) != 0) {
 308                                 free_ChangePasswdDataMS(&chpw);
 309                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 310                                                                 KRB5_KPASSWD_MALFORMED,
 311                                                                 "failed to extract principal to set",
 312                                                                 reply);
 313
 314                         }
 315 #else /* SAMBA4_INTERNAL_HEIMDAL */
 316                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 317                                                                 KRB5_KPASSWD_BAD_VERSION,
 318                                                                 "Operation Not Implemented",
 319                                                                 reply);
 320 #endif /* SAMBA4_INTERNAL_HEIMDAL */
 321                 } else {
 322                         free_ChangePasswdDataMS(&chpw);
 323                         return kpasswdd_change_password(kdc, mem_ctx, session_info,
 324                                                         &password, reply);
 325                 }
 326                 free_ChangePasswdDataMS(&chpw);
 327
 328                 if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
 329                         krb5_free_principal(context, principal);
 330                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 331                                                         KRB5_KPASSWD_MALFORMED,
 332                                                         "krb5_unparse_name failed!",
 333                                                         reply);
 334                 }
 335
 336                 krb5_free_principal(context, principal);
 337
 338                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info);
 339                 if (!samdb) {
 340                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 341                                                          KRB5_KPASSWD_HARDERROR,
 342                                                          "Unable to open database!",
 343                                                          reply);
 344                 }
 345
 346                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
 347                           session_info->server_info->domain_name,
 348                           session_info->server_info->account_name,
 349                           dom_sid_string(mem_ctx, session_info->security_token->user_sid),
 350                           set_password_on_princ));
 351                 ret = ldb_transaction_start(samdb);
 352                 if (ret) {
 353                         status = NT_STATUS_TRANSACTION_ABORTED;
 354                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 355                                                            status,
 356                                                            SAMR_REJECT_OTHER,
 357                                                            NULL,
 358                                                            reply);
 359                 }
 360
 361                 status = crack_user_principal_name(samdb, mem_ctx,
 362                                                    set_password_on_princ,
 363                                                    &set_password_on_dn, NULL);
 364                 free(set_password_on_princ);
 365                 if (!NT_STATUS_IS_OK(status)) {
 366                         ldb_transaction_cancel(samdb);
 367                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 368                                                            status,
 369                                                            SAMR_REJECT_OTHER,
 370                                                            NULL,
 371                                                            reply);
 372                 }
 373
 374                 msg = ldb_msg_new(mem_ctx);
 375                 if (msg == NULL) {
 376                         ldb_transaction_cancel(samdb);
 377                         status = NT_STATUS_NO_MEMORY;
 378                 } else {
 379                         msg->dn = ldb_dn_copy(msg, set_password_on_dn);
 380                         if (!msg->dn) {
 381                                 status = NT_STATUS_NO_MEMORY;
 382                         }
 383                 }
 384
 385                 if (NT_STATUS_IS_OK(status)) {
 386                         /* Admin password set */
 387                         status = samdb_set_password(samdb, mem_ctx,
 388                                                     set_password_on_dn, NULL,
 389                                                     msg, &password, NULL, NULL,
 390                                                     false, /* this is not a user password change */
 391                                                     &reject_reason, &dominfo);
 392                 }
 393
 394                 if (NT_STATUS_IS_OK(status)) {
 395                         /* modify the samdb record */
 396                         ret = samdb_replace(samdb, mem_ctx, msg);
 397                         if (ret != 0) {
 398                                 DEBUG(2,("Failed to modify record to set password on %s: %s\n",
 399                                          ldb_dn_get_linearized(msg->dn),
 400                                          ldb_errstring(samdb)));
 401                                 status = NT_STATUS_ACCESS_DENIED;
 402                         }
 403                 }
 404                 if (NT_STATUS_IS_OK(status)) {
 405                         ret = ldb_transaction_commit(samdb);
 406                         if (ret != 0) {
 407                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
 408                                          ldb_dn_get_linearized(msg->dn),
 409                                          ldb_errstring(samdb)));
 410                                 status = NT_STATUS_TRANSACTION_ABORTED;
 411                         }
 412                 } else {
 413                         ldb_transaction_cancel(samdb);
 414                 }
 415                 return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 416                                                    status,
 417                                                    reject_reason,
 418                                                    dominfo,
 419                                                    reply);
 420         }
 421         default:
 422                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 423                                                  KRB5_KPASSWD_BAD_VERSION,
 424                                                  talloc_asprintf(mem_ctx,
 425                                                                  "Protocol version %u not supported",
 426                                                                  version),
 427                                                  reply);
 428         }
 429         return true;
 430 }
 431
 432 bool kpasswdd_process(struct kdc_server *kdc,
 433                       TALLOC_CTX *mem_ctx,
 434                       DATA_BLOB *input,
 435                       DATA_BLOB *reply,
 436                       struct socket_address *peer_addr,
 437                       struct socket_address *my_addr,
 438                       int datagram_reply)
 439 {
 440         bool ret;
 441         const uint16_t header_len = 6;
 442         uint16_t len;
 443         uint16_t ap_req_len;
 444         uint16_t krb_priv_len;
 445         uint16_t version;
 446         NTSTATUS nt_status;
 447         DATA_BLOB ap_req, krb_priv_req;
 448         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
 449         DATA_BLOB ap_rep = data_blob(NULL, 0);
 450         DATA_BLOB kpasswd_req, kpasswd_rep;
 451         struct cli_credentials *server_credentials;
 452         struct gensec_security *gensec_security;
 453         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 454
 455         if (!tmp_ctx) {
 456                 return false;
 457         }
 458
 459         /* Be parinoid.  We need to ensure we don't just let the
 460          * caller lead us into a buffer overflow */
 461         if (input->length <= header_len) {
 462                 talloc_free(tmp_ctx);
 463                 return false;
 464         }
 465
 466         len = RSVAL(input->data, 0);
 467         if (input->length != len) {
 468                 talloc_free(tmp_ctx);
 469                 return false;
 470         }
 471
 472         /* There are two different versions of this protocol so far,
 473          * plus others in the standards pipe.  Fortunetly they all
 474          * take a very similar framing */
 475         version = RSVAL(input->data, 2);
 476         ap_req_len = RSVAL(input->data, 4);
 477         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
 478                 talloc_free(tmp_ctx);
 479                 return false;
 480         }
 481
 482         krb_priv_len = len - ap_req_len;
 483         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
 484         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
 485
 486         server_credentials = cli_credentials_init(tmp_ctx);
 487         if (!server_credentials) {
 488                 DEBUG(1, ("Failed to init server credentials\n"));
 489                 return false;
 490         }
 491
 492         /* We want the credentials subsystem to use the krb5 context
 493          * we already have, rather than a new context */
 494         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
 495         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
 496         nt_status = cli_credentials_set_stored_principal(server_credentials, kdc->task->event_ctx, kdc->task->lp_ctx, "kadmin/changepw");
 497         if (!NT_STATUS_IS_OK(nt_status)) {
 498                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 499                                                        KRB5_KPASSWD_HARDERROR,
 500                                                        talloc_asprintf(mem_ctx,
 501                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n",
 502                                                                        nt_errstr(nt_status)),
 503                                                        &krb_priv_rep);
 504                 ap_rep.length = 0;
 505                 if (ret) {
 506                         goto reply;
 507                 }
 508                 talloc_free(tmp_ctx);
 509                 return ret;
 510         }
 511
 512         /* We don't strictly need to call this wrapper, and could call
 513          * gensec_server_start directly, as we have no need for NTLM
 514          * and we have a PAC, but this ensures that the wrapper can be
 515          * safely extended for other helpful things in future */
 516         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx,
 517                                               kdc->task->msg_ctx,
 518                                               kdc->task->lp_ctx,
 519                                               server_credentials,
 520                                               "kpasswd",
 521                                               &gensec_security);
 522         if (!NT_STATUS_IS_OK(nt_status)) {
 523                 talloc_free(tmp_ctx);
 524                 return false;
 525         }
 526
 527         /* The kerberos PRIV packets include these addresses.  MIT
 528          * clients check that they are present */
 529         nt_status = gensec_set_peer_addr(gensec_security, peer_addr);
 530         if (!NT_STATUS_IS_OK(nt_status)) {
 531                 talloc_free(tmp_ctx);
 532                 return false;
 533         }
 534         nt_status = gensec_set_my_addr(gensec_security, my_addr);
 535         if (!NT_STATUS_IS_OK(nt_status)) {
 536                 talloc_free(tmp_ctx);
 537                 return false;
 538         }
 539
 540         /* We want the GENSEC wrap calls to generate PRIV tokens */
 541         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
 542
 543         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
 544         if (!NT_STATUS_IS_OK(nt_status)) {
 545                 talloc_free(tmp_ctx);
 546                 return false;
 547         }
 548
 549         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
 550         nt_status = gensec_update(gensec_security, tmp_ctx, ap_req, &ap_rep);
 551         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 552
 553                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 554                                                        KRB5_KPASSWD_HARDERROR,
 555                                                        talloc_asprintf(mem_ctx,
 556                                                                        "gensec_update failed: %s",
 557                                                                        nt_errstr(nt_status)),
 558                                                        &krb_priv_rep);
 559                 ap_rep.length = 0;
 560                 if (ret) {
 561                         goto reply;
 562                 }
 563                 talloc_free(tmp_ctx);
 564                 return ret;
 565         }
 566
 567         /* Extract the data from the KRB-PRIV half of the message */
 568         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
 569         if (!NT_STATUS_IS_OK(nt_status)) {
 570                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 571                                                        KRB5_KPASSWD_HARDERROR,
 572                                                        talloc_asprintf(mem_ctx,
 573                                                                        "gensec_unwrap failed: %s",
 574                                                                        nt_errstr(nt_status)),
 575                                                        &krb_priv_rep);
 576                 ap_rep.length = 0;
 577                 if (ret) {
 578                         goto reply;
 579                 }
 580                 talloc_free(tmp_ctx);
 581                 return ret;
 582         }
 583
 584         /* Figure out something to do with it (probably changing a password...) */
 585         ret = kpasswd_process_request(kdc, tmp_ctx,
 586                                       gensec_security,
 587                                       version,
 588                                       &kpasswd_req, &kpasswd_rep);
 589         if (!ret) {
 590                 /* Argh! */
 591                 return false;
 592         }
 593
 594         /* And wrap up the reply: This ensures that the error message
 595          * or success can be verified by the client */
 596         nt_status = gensec_wrap(gensec_security, tmp_ctx,
 597                                 &kpasswd_rep, &krb_priv_rep);
 598         if (!NT_STATUS_IS_OK(nt_status)) {
 599                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 600                                                        KRB5_KPASSWD_HARDERROR,
 601                                                        talloc_asprintf(mem_ctx,
 602                                                                        "gensec_wrap failed: %s",
 603                                                                        nt_errstr(nt_status)),
 604                                                        &krb_priv_rep);
 605                 ap_rep.length = 0;
 606                 if (ret) {
 607                         goto reply;
 608                 }
 609                 talloc_free(tmp_ctx);
 610                 return ret;
 611         }
 612
 613 reply:
 614         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
 615         if (!reply->data) {
 616                 return false;
 617         }
 618
 619         RSSVAL(reply->data, 0, reply->length);
 620         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
 621         RSSVAL(reply->data, 4, ap_rep.length);
 622         memcpy(reply->data + header_len,
 623                ap_rep.data,
 624                ap_rep.length);
 625         memcpy(reply->data + header_len + ap_rep.length,
 626                krb_priv_rep.data,
 627                krb_priv_rep.length);
 628
 629         talloc_free(tmp_ctx);
 630         return ret;
 631 }
 632