source4/kdc/kpasswd-heimdal.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    kpasswd Server implementation
   5
   6    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   7    Copyright (C) Andrew Tridgell        2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "smbd/service_task.h"
  25 #include "auth/gensec/gensec.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "auth/auth.h"
  28 #include "dsdb/samdb/samdb.h"
  29 #include "../lib/util/util_ldb.h"
  30 #include "libcli/security/security.h"
  31 #include "param/param.h"
  32 #include "kdc/kdc-glue.h"
  33 #include "dsdb/common/util.h"
  34 #include "kdc/kpasswd_glue.h"
  35
  36 /* Return true if there is a valid error packet formed in the error_blob */
  37 static bool kpasswdd_make_error_reply(struct kdc_server *kdc,
  38                                      TALLOC_CTX *mem_ctx,
  39                                      uint16_t result_code,
  40                                      const char *error_string,
  41                                      DATA_BLOB *error_blob)
  42 {
  43         char *error_string_utf8;
  44         size_t len;
  45
  46         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
  47
  48         if (!push_utf8_talloc(mem_ctx, &error_string_utf8, error_string, &len)) {
  49                 return false;
  50         }
  51
  52         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
  53         if (!error_blob->data) {
  54                 return false;
  55         }
  56         RSSVAL(error_blob->data, 0, result_code);
  57         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
  58         return true;
  59 }
  60
  61 /* Return true if there is a valid error packet formed in the error_blob */
  62 static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc,
  63                                             TALLOC_CTX *mem_ctx,
  64                                             uint16_t result_code,
  65                                             const char *error_string,
  66                                             DATA_BLOB *error_blob)
  67 {
  68         bool ret;
  69         int kret;
  70         DATA_BLOB error_bytes;
  71         krb5_data k5_error_bytes, k5_error_blob;
  72         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string,
  73                                        &error_bytes);
  74         if (!ret) {
  75                 return false;
  76         }
  77         k5_error_bytes.data = error_bytes.data;
  78         k5_error_bytes.length = error_bytes.length;
  79         kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
  80                              result_code, NULL, &k5_error_bytes,
  81                              NULL, NULL, NULL, NULL, &k5_error_blob);
  82         if (kret) {
  83                 return false;
  84         }
  85         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
  86         krb5_data_free(&k5_error_blob);
  87         if (!error_blob->data) {
  88                 return false;
  89         }
  90         return true;
  91 }
  92
  93 static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc,
  94                                         TALLOC_CTX *mem_ctx,
  95                                         NTSTATUS status,
  96                                         enum samPwdChangeReason reject_reason,
  97                                         struct samr_DomInfo1 *dominfo,
  98                                         DATA_BLOB *error_blob)
  99 {
 100         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
 101                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 102                                                 KRB5_KPASSWD_ACCESSDENIED,
 103                                                 "No such user when changing password",
 104                                                 error_blob);
 105         }
 106         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
 107                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 108                                                 KRB5_KPASSWD_ACCESSDENIED,
 109                                                 "Not permitted to change password",
 110                                                 error_blob);
 111         }
 112         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
 113                 const char *reject_string;
 114                 switch (reject_reason) {
 115                 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
 116                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long.",
 117                                                         dominfo->min_password_length);
 118                         break;
 119                 case SAM_PWD_CHANGE_NOT_COMPLEX:
 120                         reject_string = "Password does not meet complexity requirements";
 121                         break;
 122                 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
 123                         reject_string = talloc_asprintf(mem_ctx, "Password is already in password history.  New password must not match any of your %d previous passwords.",
 124                                                         dominfo->password_history_length);
 125                         break;
 126                 default:
 127                         reject_string = "Password change rejected, password changes may not be permitted on this account, or the minimum password age may not have elapsed.";
 128                         break;
 129                 }
 130                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 131                                                 KRB5_KPASSWD_SOFTERROR,
 132                                                 reject_string,
 133                                                 error_blob);
 134         }
 135         if (!NT_STATUS_IS_OK(status)) {
 136                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 137                                                  KRB5_KPASSWD_HARDERROR,
 138                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
 139                                                  error_blob);
 140
 141         }
 142         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
 143                                         "Password changed",
 144                                         error_blob);
 145 }
 146
 147 /*
 148    A user password change
 149
 150    Return true if there is a valid error packet (or success) formed in
 151    the error_blob
 152 */
 153 static bool kpasswdd_change_password(struct kdc_server *kdc,
 154                                      TALLOC_CTX *mem_ctx,
 155                                      struct auth_session_info *session_info,
 156                                      const DATA_BLOB *password,
 157                                      DATA_BLOB *reply)
 158 {
 159         NTSTATUS status;
 160         NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
 161         enum samPwdChangeReason reject_reason;
 162         struct samr_DomInfo1 *dominfo;
 163         const char *error_string;
 164
 165         status = samdb_kpasswd_change_password(mem_ctx,
 166                                                kdc->task->lp_ctx,
 167                                                kdc->task->event_ctx,
 168                                                kdc->samdb,
 169                                                session_info,
 170                                                password,
 171                                                &reject_reason,
 172                                                &dominfo,
 173                                                &error_string,
 174                                                &result);
 175         if (!NT_STATUS_IS_OK(status)) {
 176                 return kpasswdd_make_error_reply(kdc,
 177                                                  mem_ctx,
 178                                                  KRB5_KPASSWD_ACCESSDENIED,
 179                                                  error_string,
 180                                                  reply);
 181         }
 182
 183         return kpasswd_make_pwchange_reply(kdc,
 184                                            mem_ctx,
 185                                            result,
 186                                            reject_reason,
 187                                            dominfo,
 188                                            reply);
 189 }
 190
 191 static bool kpasswd_process_request(struct kdc_server *kdc,
 192                                     TALLOC_CTX *mem_ctx,
 193                                     struct gensec_security *gensec_security,
 194                                     uint16_t version,
 195                                     DATA_BLOB *input,
 196                                     DATA_BLOB *reply)
 197 {
 198         struct auth_session_info *session_info;
 199         size_t pw_len;
 200
 201         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security,
 202                                                  mem_ctx,
 203                                                  &session_info))) {
 204                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 205                                                 KRB5_KPASSWD_HARDERROR,
 206                                                 "gensec_session_info failed!",
 207                                                 reply);
 208         }
 209
 210         switch (version) {
 211         case KRB5_KPASSWD_VERS_CHANGEPW:
 212         {
 213                 DATA_BLOB password;
 214                 if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
 215                                                CH_UTF8, CH_UTF16,
 216                                                (const char *)input->data,
 217                                                input->length,
 218                                                (void **)&password.data, &pw_len)) {
 219                         return false;
 220                 }
 221                 password.length = pw_len;
 222
 223                 return kpasswdd_change_password(kdc, mem_ctx, session_info,
 224                                                 &password, reply);
 225         }
 226         case KRB5_KPASSWD_VERS_SETPW:
 227         {
 228                 NTSTATUS status;
 229                 enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
 230                 struct samr_DomInfo1 *dominfo = NULL;
 231                 struct ldb_context *samdb;
 232                 krb5_context context = kdc->smb_krb5_context->krb5_context;
 233
 234                 ChangePasswdDataMS chpw;
 235                 DATA_BLOB password;
 236
 237                 krb5_principal principal;
 238                 char *set_password_on_princ;
 239                 struct ldb_dn *set_password_on_dn;
 240                 bool service_principal_name = false;
 241
 242                 size_t len;
 243                 int ret;
 244
 245                 ret = decode_ChangePasswdDataMS(input->data, input->length,
 246                                                 &chpw, &len);
 247                 if (ret) {
 248                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 249                                                         KRB5_KPASSWD_MALFORMED,
 250                                                         "failed to decode password change structure",
 251                                                         reply);
 252                 }
 253
 254                 if (!convert_string_talloc_handle(mem_ctx, lpcfg_iconv_handle(kdc->task->lp_ctx),
 255                                                CH_UTF8, CH_UTF16,
 256                                                (const char *)chpw.newpasswd.data,
 257                                                chpw.newpasswd.length,
 258                                                (void **)&password.data, &pw_len)) {
 259                         free_ChangePasswdDataMS(&chpw);
 260                         return false;
 261                 }
 262
 263                 password.length = pw_len;
 264
 265                 if ((chpw.targname && !chpw.targrealm)
 266                     || (!chpw.targname && chpw.targrealm)) {
 267                         free_ChangePasswdDataMS(&chpw);
 268                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 269                                                         KRB5_KPASSWD_MALFORMED,
 270                                                         "Realm and principal must be both present, or neither present",
 271                                                         reply);
 272                 }
 273                 if (chpw.targname && chpw.targrealm) {
 274                         ret = krb5_build_principal_ext(kdc->smb_krb5_context->krb5_context,
 275                                                        &principal,
 276                                                        strlen(*chpw.targrealm),
 277                                                        *chpw.targrealm, 0);
 278                         if (ret) {
 279                                 free_ChangePasswdDataMS(&chpw);
 280                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 281                                                                 KRB5_KPASSWD_MALFORMED,
 282                                                                 "failed to get principal",
 283                                                                 reply);
 284                         }
 285                         if (copy_PrincipalName(chpw.targname, &principal->name)) {
 286                                 free_ChangePasswdDataMS(&chpw);
 287                                 krb5_free_principal(context, principal);
 288                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 289                                                                 KRB5_KPASSWD_MALFORMED,
 290                                                                 "failed to extract principal to set",
 291                                                                 reply);
 292                         }
 293                 } else {
 294                         free_ChangePasswdDataMS(&chpw);
 295                         return kpasswdd_change_password(kdc, mem_ctx, session_info,
 296                                                         &password, reply);
 297                 }
 298                 free_ChangePasswdDataMS(&chpw);
 299
 300                 if (principal->name.name_string.len >= 2) {
 301                         service_principal_name = true;
 302
 303                         /* We use this, rather than 'no realm' flag,
 304                          * as we don't want to accept a password
 305                          * change on a principal from another realm */
 306
 307                         if (krb5_unparse_name_short(context, principal, &set_password_on_princ) != 0) {
 308                                 krb5_free_principal(context, principal);
 309                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 310                                                                  KRB5_KPASSWD_MALFORMED,
 311                                                                  "krb5_unparse_name failed!",
 312                                                                  reply);
 313                         }
 314                 } else {
 315                         if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
 316                                 krb5_free_principal(context, principal);
 317                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 318                                                                  KRB5_KPASSWD_MALFORMED,
 319                                                                  "krb5_unparse_name failed!",
 320                                                                  reply);
 321                         }
 322                 }
 323                 krb5_free_principal(context, principal);
 324
 325                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info, 0);
 326                 if (!samdb) {
 327                         free(set_password_on_princ);
 328                         return kpasswdd_make_error_reply(kdc, mem_ctx,
 329                                                          KRB5_KPASSWD_HARDERROR,
 330                                                          "Unable to open database!",
 331                                                          reply);
 332                 }
 333
 334                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n",
 335                           session_info->info->domain_name,
 336                           session_info->info->account_name,
 337                           dom_sid_string(mem_ctx, &session_info->security_token->sids[PRIMARY_USER_SID_INDEX]),
 338                           set_password_on_princ));
 339                 ret = ldb_transaction_start(samdb);
 340                 if (ret != LDB_SUCCESS) {
 341                         free(set_password_on_princ);
 342                         status = NT_STATUS_TRANSACTION_ABORTED;
 343                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 344                                                            status,
 345                                                            SAM_PWD_CHANGE_NO_ERROR,
 346                                                            NULL,
 347                                                            reply);
 348                 }
 349
 350                 if (service_principal_name) {
 351                         status = crack_service_principal_name(samdb, mem_ctx,
 352                                                               set_password_on_princ,
 353                                                               &set_password_on_dn, NULL);
 354                 } else {
 355                         status = crack_user_principal_name(samdb, mem_ctx,
 356                                                            set_password_on_princ,
 357                                                            &set_password_on_dn, NULL);
 358                 }
 359                 free(set_password_on_princ);
 360                 if (!NT_STATUS_IS_OK(status)) {
 361                         ldb_transaction_cancel(samdb);
 362                         return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 363                                                            status,
 364                                                            SAM_PWD_CHANGE_NO_ERROR,
 365                                                            NULL,
 366                                                            reply);
 367                 }
 368
 369                 if (NT_STATUS_IS_OK(status)) {
 370                         /* Admin password set */
 371                         status = samdb_set_password(samdb, mem_ctx,
 372                                                     set_password_on_dn, NULL,
 373                                                     &password, NULL, NULL,
 374                                                     NULL, NULL, /* this is not a user password change */
 375                                                     &reject_reason, &dominfo);
 376                 }
 377
 378                 if (NT_STATUS_IS_OK(status)) {
 379                         ret = ldb_transaction_commit(samdb);
 380                         if (ret != LDB_SUCCESS) {
 381                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
 382                                          ldb_dn_get_linearized(set_password_on_dn),
 383                                          ldb_errstring(samdb)));
 384                                 status = NT_STATUS_TRANSACTION_ABORTED;
 385                         }
 386                 } else {
 387                         ldb_transaction_cancel(samdb);
 388                 }
 389                 return kpasswd_make_pwchange_reply(kdc, mem_ctx,
 390                                                    status,
 391                                                    reject_reason,
 392                                                    dominfo,
 393                                                    reply);
 394         }
 395         default:
 396                 return kpasswdd_make_error_reply(kdc, mem_ctx,
 397                                                  KRB5_KPASSWD_BAD_VERSION,
 398                                                  talloc_asprintf(mem_ctx,
 399                                                                  "Protocol version %u not supported",
 400                                                                  version),
 401                                                  reply);
 402         }
 403 }
 404
 405 enum kdc_process_ret kpasswdd_process(struct kdc_server *kdc,
 406                                       TALLOC_CTX *mem_ctx,
 407                                       DATA_BLOB *input,
 408                                       DATA_BLOB *reply,
 409                                       struct tsocket_address *peer_addr,
 410                                       struct tsocket_address *my_addr,
 411                                       int datagram_reply)
 412 {
 413         bool ret;
 414         const uint16_t header_len = 6;
 415         uint16_t len;
 416         uint16_t ap_req_len;
 417         uint16_t krb_priv_len;
 418         uint16_t version;
 419         NTSTATUS nt_status;
 420         DATA_BLOB ap_req, krb_priv_req;
 421         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
 422         DATA_BLOB ap_rep = data_blob(NULL, 0);
 423         DATA_BLOB kpasswd_req, kpasswd_rep;
 424         struct cli_credentials *server_credentials;
 425         struct gensec_security *gensec_security;
 426         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 427
 428         char *keytab_name;
 429
 430         if (!tmp_ctx) {
 431                 return KDC_PROCESS_FAILED;
 432         }
 433
 434         if (kdc->am_rodc) {
 435                 talloc_free(tmp_ctx);
 436                 return KDC_PROCESS_PROXY;
 437         }
 438
 439         /* Be parinoid.  We need to ensure we don't just let the
 440          * caller lead us into a buffer overflow */
 441         if (input->length <= header_len) {
 442                 talloc_free(tmp_ctx);
 443                 return KDC_PROCESS_FAILED;
 444         }
 445
 446         len = RSVAL(input->data, 0);
 447         if (input->length != len) {
 448                 talloc_free(tmp_ctx);
 449                 return KDC_PROCESS_FAILED;
 450         }
 451
 452         /* There are two different versions of this protocol so far,
 453          * plus others in the standards pipe.  Fortunetly they all
 454          * take a very similar framing */
 455         version = RSVAL(input->data, 2);
 456         ap_req_len = RSVAL(input->data, 4);
 457         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
 458                 talloc_free(tmp_ctx);
 459                 return KDC_PROCESS_FAILED;
 460         }
 461
 462         krb_priv_len = len - ap_req_len;
 463         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
 464         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
 465
 466         server_credentials = cli_credentials_init(tmp_ctx);
 467         if (!server_credentials) {
 468                 DEBUG(1, ("Failed to init server credentials\n"));
 469                 talloc_free(tmp_ctx);
 470                 return KDC_PROCESS_FAILED;
 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, kdc->task->lp_ctx);
 477
 478         keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->base_ctx);
 479
 480         cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
 481         ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
 482         if (ret != 0) {
 483                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 484                                                        KRB5_KPASSWD_HARDERROR,
 485                                                        talloc_asprintf(mem_ctx,
 486                                                                        "Failed to obtain server credentials for kadmin/changepw!"),
 487                                                        &krb_priv_rep);
 488                 ap_rep.length = 0;
 489                 if (ret) {
 490                         goto reply;
 491                 }
 492                 talloc_free(tmp_ctx);
 493                 return ret;
 494         }
 495
 496         /* We don't strictly need to call this wrapper, and could call
 497          * gensec_server_start directly, as we have no need for NTLM
 498          * and we have a PAC, but this ensures that the wrapper can be
 499          * safely extended for other helpful things in future */
 500         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx,
 501                                               kdc->task->msg_ctx,
 502                                               kdc->task->lp_ctx,
 503                                               server_credentials,
 504                                               "kpasswd",
 505                                               &gensec_security);
 506         if (!NT_STATUS_IS_OK(nt_status)) {
 507                 talloc_free(tmp_ctx);
 508                 return KDC_PROCESS_FAILED;
 509         }
 510
 511         /* The kerberos PRIV packets include these addresses.  MIT
 512          * clients check that they are present */
 513 #if 0
 514         /* Skip this part for now, it breaks with a NetAPP filer and
 515          * in any case where the client address is behind NAT.  If
 516          * older MIT clients need this, we might have to insert more
 517          * complex code */
 518
 519         nt_status = gensec_set_remote_address(gensec_security, peer_addr);
 520         if (!NT_STATUS_IS_OK(nt_status)) {
 521                 talloc_free(tmp_ctx);
 522                 return KDC_PROCESS_FAILED;
 523         }
 524 #endif
 525
 526         nt_status = gensec_set_local_address(gensec_security, my_addr);
 527         if (!NT_STATUS_IS_OK(nt_status)) {
 528                 talloc_free(tmp_ctx);
 529                 return KDC_PROCESS_FAILED;
 530         }
 531
 532         /* We want the GENSEC wrap calls to generate PRIV tokens */
 533         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
 534
 535         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
 536         if (!NT_STATUS_IS_OK(nt_status)) {
 537                 talloc_free(tmp_ctx);
 538                 return KDC_PROCESS_FAILED;
 539         }
 540
 541         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
 542         nt_status = gensec_update_ev(gensec_security, tmp_ctx, kdc->task->event_ctx, ap_req, &ap_rep);
 543         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
 544
 545                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 546                                                        KRB5_KPASSWD_HARDERROR,
 547                                                        talloc_asprintf(mem_ctx,
 548                                                                        "gensec_update failed: %s",
 549                                                                        nt_errstr(nt_status)),
 550                                                        &krb_priv_rep);
 551                 ap_rep.length = 0;
 552                 if (ret) {
 553                         goto reply;
 554                 }
 555                 talloc_free(tmp_ctx);
 556                 return KDC_PROCESS_FAILED;
 557         }
 558
 559         /* Extract the data from the KRB-PRIV half of the message */
 560         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
 561         if (!NT_STATUS_IS_OK(nt_status)) {
 562                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 563                                                        KRB5_KPASSWD_HARDERROR,
 564                                                        talloc_asprintf(mem_ctx,
 565                                                                        "gensec_unwrap failed: %s",
 566                                                                        nt_errstr(nt_status)),
 567                                                        &krb_priv_rep);
 568                 ap_rep.length = 0;
 569                 if (ret) {
 570                         goto reply;
 571                 }
 572                 talloc_free(tmp_ctx);
 573                 return KDC_PROCESS_FAILED;
 574         }
 575
 576         /* Figure out something to do with it (probably changing a password...) */
 577         ret = kpasswd_process_request(kdc, tmp_ctx,
 578                                       gensec_security,
 579                                       version,
 580                                       &kpasswd_req, &kpasswd_rep);
 581         if (!ret) {
 582                 /* Argh! */
 583                 talloc_free(tmp_ctx);
 584                 return KDC_PROCESS_FAILED;
 585         }
 586
 587         /* And wrap up the reply: This ensures that the error message
 588          * or success can be verified by the client */
 589         nt_status = gensec_wrap(gensec_security, tmp_ctx,
 590                                 &kpasswd_rep, &krb_priv_rep);
 591         if (!NT_STATUS_IS_OK(nt_status)) {
 592                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
 593                                                        KRB5_KPASSWD_HARDERROR,
 594                                                        talloc_asprintf(mem_ctx,
 595                                                                        "gensec_wrap failed: %s",
 596                                                                        nt_errstr(nt_status)),
 597                                                        &krb_priv_rep);
 598                 ap_rep.length = 0;
 599                 if (ret) {
 600                         goto reply;
 601                 }
 602                 talloc_free(tmp_ctx);
 603                 return KDC_PROCESS_FAILED;
 604         }
 605
 606 reply:
 607         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
 608         if (!reply->data) {
 609                 talloc_free(tmp_ctx);
 610                 return KDC_PROCESS_FAILED;
 611         }
 612
 613         RSSVAL(reply->data, 0, reply->length);
 614         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
 615         RSSVAL(reply->data, 4, ap_rep.length);
 616         memcpy(reply->data + header_len,
 617                ap_rep.data,
 618                ap_rep.length);
 619         memcpy(reply->data + header_len + ap_rep.length,
 620                krb_priv_rep.data,
 621                krb_priv_rep.length);
 622
 623         talloc_free(tmp_ctx);
 624         return KDC_PROCESS_OK;
 625 }