s4-kdc: Migrate to tsocket_address.
[ira/wip.git] / 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 "lib/tsocket/tsocket.h"
28 #include "system/network.h"
29 #include "../lib/util/dlinklist.h"
30 #include "lib/ldb/include/ldb.h"
31 #include "auth/gensec/gensec.h"
32 #include "auth/credentials/credentials.h"
33 #include "auth/credentials/credentials_krb5.h"
34 #include "auth/auth.h"
35 #include "dsdb/samdb/samdb.h"
36 #include "rpc_server/dcerpc_server.h"
37 #include "rpc_server/samr/proto.h"
38 #include "libcli/security/security.h"
39 #include "param/param.h"
40 #include "kdc/kdc.h"
41
42 /* TODO: remove all SAMBA4_INTERNAL_HEIMDAL stuff from this file */
43 #ifdef SAMBA4_INTERNAL_HEIMDAL
44 #include "heimdal_build/kpasswdd-glue.h"
45 #endif
46
47 /* Return true if there is a valid error packet formed in the error_blob */
48 static bool kpasswdd_make_error_reply(struct kdc_server *kdc, 
49                                      TALLOC_CTX *mem_ctx, 
50                                      uint16_t result_code, 
51                                      const char *error_string, 
52                                      DATA_BLOB *error_blob) 
53 {
54         char *error_string_utf8;
55         size_t len;
56         
57         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
58
59         if (!push_utf8_talloc(mem_ctx, &error_string_utf8, error_string, &len)) {
60                 return false;
61         }
62
63         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
64         if (!error_blob->data) {
65                 return false;
66         }
67         RSSVAL(error_blob->data, 0, result_code);
68         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
69         return true;
70 }
71
72 /* Return true if there is a valid error packet formed in the error_blob */
73 static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc, 
74                                             TALLOC_CTX *mem_ctx, 
75                                             uint16_t result_code, 
76                                             const char *error_string, 
77                                             DATA_BLOB *error_blob) 
78 {
79         bool ret;
80         int kret;
81         DATA_BLOB error_bytes;
82         krb5_data k5_error_bytes, k5_error_blob;
83         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string, 
84                                        &error_bytes);
85         if (!ret) {
86                 return false;
87         }
88         k5_error_bytes.data = error_bytes.data;
89         k5_error_bytes.length = error_bytes.length;
90         kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
91                              result_code, NULL, &k5_error_bytes, 
92                              NULL, NULL, NULL, NULL, &k5_error_blob);
93         if (kret) {
94                 return false;
95         }
96         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
97         krb5_data_free(&k5_error_blob);
98         if (!error_blob->data) {
99                 return false;
100         }
101         return true;
102 }
103
104 static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc, 
105                                         TALLOC_CTX *mem_ctx, 
106                                         NTSTATUS status, 
107                                         enum samPwdChangeReason reject_reason,
108                                         struct samr_DomInfo1 *dominfo,
109                                         DATA_BLOB *error_blob) 
110 {
111         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
112                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
113                                                 KRB5_KPASSWD_ACCESSDENIED,
114                                                 "No such user when changing password",
115                                                 error_blob);
116         }
117         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
118                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
119                                                 KRB5_KPASSWD_ACCESSDENIED,
120                                                 "Not permitted to change password",
121                                                 error_blob);
122         }
123         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
124                 const char *reject_string;
125                 switch (reject_reason) {
126                 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
127                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long",
128                                                         dominfo->min_password_length);
129                         break;
130                 case SAM_PWD_CHANGE_NOT_COMPLEX:
131                         reject_string = "Password does not meet complexity requirements";
132                         break;
133                 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
134                         reject_string = "Password is already in password history";
135                         break;
136                 default:
137                         reject_string = talloc_asprintf(mem_ctx, "Password must be at least %d characters long, and cannot match any of your %d previous passwords",
138                                                         dominfo->min_password_length, dominfo->password_history_length);
139                         break;
140                 }
141                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
142                                                 KRB5_KPASSWD_SOFTERROR,
143                                                 reject_string,
144                                                 error_blob);
145         }
146         if (!NT_STATUS_IS_OK(status)) {
147                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
148                                                  KRB5_KPASSWD_HARDERROR,
149                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
150                                                  error_blob);
151                 
152         }
153         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
154                                         "Password changed",
155                                         error_blob);
156 }
157
158 /* 
159    A user password change
160    
161    Return true if there is a valid error packet (or sucess) formed in
162    the error_blob
163 */
164 static bool kpasswdd_change_password(struct kdc_server *kdc,
165                                      TALLOC_CTX *mem_ctx, 
166                                      struct auth_session_info *session_info,
167                                      const DATA_BLOB *password,
168                                      DATA_BLOB *reply)
169 {
170         NTSTATUS status;
171         enum samPwdChangeReason reject_reason;
172         struct samr_DomInfo1 *dominfo;
173         struct ldb_context *samdb;
174
175         samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, system_session(kdc->task->lp_ctx));
176         if (!samdb) {
177                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
178                                                 KRB5_KPASSWD_HARDERROR,
179                                                 "Failed to open samdb",
180                                                 reply);
181         }
182         
183         DEBUG(3, ("Changing password of %s\\%s (%s)\n", 
184                   session_info->server_info->domain_name,
185                   session_info->server_info->account_name,
186                   dom_sid_string(mem_ctx, session_info->security_token->user_sid)));
187
188         /* User password change */
189         status = samdb_set_password_sid(samdb, mem_ctx, 
190                                         session_info->security_token->user_sid,
191                                         password, NULL, NULL, 
192                                         true, /* this is a user password change */
193                                         &reject_reason,
194                                         &dominfo);
195         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
196                                            status, 
197                                            reject_reason,
198                                            dominfo, 
199                                            reply);
200
201 }
202
203 static bool kpasswd_process_request(struct kdc_server *kdc,
204                                     TALLOC_CTX *mem_ctx, 
205                                     struct gensec_security *gensec_security,
206                                     uint16_t version,
207                                     DATA_BLOB *input, 
208                                     DATA_BLOB *reply)
209 {
210         struct auth_session_info *session_info;
211         size_t pw_len;
212
213         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security, 
214                                                  &session_info))) {
215                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
216                                                 KRB5_KPASSWD_HARDERROR,
217                                                 "gensec_session_info failed!",
218                                                 reply);
219         }
220
221         switch (version) {
222         case KRB5_KPASSWD_VERS_CHANGEPW:
223         {
224                 DATA_BLOB password;
225                 if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), 
226                                                CH_UTF8, CH_UTF16, 
227                                                (const char *)input->data, 
228                                                input->length,
229                                                (void **)&password.data, &pw_len, false)) {
230                         return false;
231                 }
232                 password.length = pw_len;
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 samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
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                 DATA_BLOB 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                 if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), 
272                                                CH_UTF8, CH_UTF16, 
273                                                (const char *)chpw.newpasswd.data, 
274                                                chpw.newpasswd.length,
275                                                (void **)&password.data, &pw_len, false)) {
276                         free_ChangePasswdDataMS(&chpw);
277                         return false;
278                 }
279                 
280                 password.length = pw_len;
281         
282                 if ((chpw.targname && !chpw.targrealm) 
283                     || (!chpw.targname && chpw.targrealm)) {
284                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
285                                                         KRB5_KPASSWD_MALFORMED,
286                                                         "Realm and principal must be both present, or neither present",
287                                                         reply);
288                 }
289                 if (chpw.targname && chpw.targrealm) {
290 #ifdef SAMBA4_INTERNAL_HEIMDAL
291                         if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context,
292                                                                &principal, *chpw.targname, 
293                                                                *chpw.targrealm) != 0) {
294                                 free_ChangePasswdDataMS(&chpw);
295                                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
296                                                                 KRB5_KPASSWD_MALFORMED,
297                                                                 "failed to extract principal to set",
298                                                                 reply);
299                                 
300                         }
301 #else /* SAMBA4_INTERNAL_HEIMDAL */
302                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
303                                                                 KRB5_KPASSWD_BAD_VERSION,
304                                                                 "Operation Not Implemented",
305                                                                 reply);
306 #endif /* SAMBA4_INTERNAL_HEIMDAL */
307                 } else {
308                         free_ChangePasswdDataMS(&chpw);
309                         return kpasswdd_change_password(kdc, mem_ctx, session_info, 
310                                                         &password, reply);
311                 }
312                 free_ChangePasswdDataMS(&chpw);
313
314                 if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
315                         krb5_free_principal(context, principal);
316                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
317                                                         KRB5_KPASSWD_MALFORMED,
318                                                         "krb5_unparse_name failed!",
319                                                         reply);
320                 }
321                 
322                 krb5_free_principal(context, principal);
323                 
324                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info);
325                 if (!samdb) {
326                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
327                                                          KRB5_KPASSWD_HARDERROR,
328                                                          "Unable to open database!",
329                                                          reply);
330                 }
331
332                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n", 
333                           session_info->server_info->domain_name,
334                           session_info->server_info->account_name,
335                           dom_sid_string(mem_ctx, session_info->security_token->user_sid), 
336                           set_password_on_princ));
337                 ret = ldb_transaction_start(samdb);
338                 if (ret) {
339                         status = NT_STATUS_TRANSACTION_ABORTED;
340                         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
341                                                            status,
342                                                            SAM_PWD_CHANGE_NO_ERROR,
343                                                            NULL, 
344                                                            reply);
345                 }
346
347                 status = crack_user_principal_name(samdb, mem_ctx, 
348                                                    set_password_on_princ, 
349                                                    &set_password_on_dn, NULL);
350                 free(set_password_on_princ);
351                 if (!NT_STATUS_IS_OK(status)) {
352                         ldb_transaction_cancel(samdb);
353                         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
354                                                            status,
355                                                            SAM_PWD_CHANGE_NO_ERROR,
356                                                            NULL, 
357                                                            reply);
358                 }
359
360                 msg = ldb_msg_new(mem_ctx);
361                 if (msg == NULL) {
362                         ldb_transaction_cancel(samdb);
363                         status = NT_STATUS_NO_MEMORY;
364                 } else {
365                         msg->dn = ldb_dn_copy(msg, set_password_on_dn);
366                         if (!msg->dn) {
367                                 status = NT_STATUS_NO_MEMORY;
368                         }
369                 }
370
371                 if (NT_STATUS_IS_OK(status)) {
372                         /* Admin password set */
373                         status = samdb_set_password(samdb, mem_ctx,
374                                                     set_password_on_dn, NULL,
375                                                     msg, &password, NULL, NULL, 
376                                                     false, /* this is not a user password change */
377                                                     &reject_reason, &dominfo);
378                 }
379
380                 if (NT_STATUS_IS_OK(status)) {
381                         /* modify the samdb record */
382                         ret = samdb_replace(samdb, mem_ctx, msg);
383                         if (ret != 0) {
384                                 DEBUG(2,("Failed to modify record to set password on %s: %s\n",
385                                          ldb_dn_get_linearized(msg->dn),
386                                          ldb_errstring(samdb)));
387                                 status = NT_STATUS_ACCESS_DENIED;
388                         }
389                 }
390                 if (NT_STATUS_IS_OK(status)) {
391                         ret = ldb_transaction_commit(samdb);
392                         if (ret != 0) {
393                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
394                                          ldb_dn_get_linearized(msg->dn),
395                                          ldb_errstring(samdb)));
396                                 status = NT_STATUS_TRANSACTION_ABORTED;
397                         }
398                 } else {
399                         ldb_transaction_cancel(samdb);
400                 }
401                 return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
402                                                    status,
403                                                    reject_reason, 
404                                                    dominfo, 
405                                                    reply);
406         }
407         default:
408                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
409                                                  KRB5_KPASSWD_BAD_VERSION,
410                                                  talloc_asprintf(mem_ctx, 
411                                                                  "Protocol version %u not supported", 
412                                                                  version),
413                                                  reply);
414         }
415         return true;
416 }
417
418 bool kpasswdd_process(struct kdc_server *kdc,
419                       TALLOC_CTX *mem_ctx, 
420                       DATA_BLOB *input, 
421                       DATA_BLOB *reply,
422                       struct tsocket_address *peer_addr,
423                       struct tsocket_address *my_addr,
424                       int datagram_reply)
425 {
426         bool ret;
427         const uint16_t header_len = 6;
428         uint16_t len;
429         uint16_t ap_req_len;
430         uint16_t krb_priv_len;
431         uint16_t version;
432         NTSTATUS nt_status;
433         DATA_BLOB ap_req, krb_priv_req;
434         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
435         DATA_BLOB ap_rep = data_blob(NULL, 0);
436         DATA_BLOB kpasswd_req, kpasswd_rep;
437         struct cli_credentials *server_credentials;
438         struct gensec_security *gensec_security;
439         struct sockaddr_storage ss;
440         ssize_t socklen;
441         struct socket_address *socket_address;
442         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
443
444         char *keytab_name;
445
446         if (!tmp_ctx) {
447                 return false;
448         }
449
450         /* Be parinoid.  We need to ensure we don't just let the
451          * caller lead us into a buffer overflow */
452         if (input->length <= header_len) {
453                 talloc_free(tmp_ctx);
454                 return false;
455         }
456
457         len = RSVAL(input->data, 0);
458         if (input->length != len) {
459                 talloc_free(tmp_ctx);
460                 return false;
461         }
462
463         /* There are two different versions of this protocol so far,
464          * plus others in the standards pipe.  Fortunetly they all
465          * take a very similar framing */
466         version = RSVAL(input->data, 2);
467         ap_req_len = RSVAL(input->data, 4);
468         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
469                 talloc_free(tmp_ctx);
470                 return false;
471         }
472         
473         krb_priv_len = len - ap_req_len;
474         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
475         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
476         
477         server_credentials = cli_credentials_init(tmp_ctx);
478         if (!server_credentials) {
479                 DEBUG(1, ("Failed to init server credentials\n"));
480                 return false;
481         }
482
483         /* We want the credentials subsystem to use the krb5 context
484          * we already have, rather than a new context */        
485         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
486         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
487
488         keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->hdb_samba4_context);
489
490         cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
491         ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->event_ctx, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
492         if (ret != 0) {
493                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
494                                                        KRB5_KPASSWD_HARDERROR,
495                                                        talloc_asprintf(mem_ctx, 
496                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n", 
497                                                                        nt_errstr(nt_status)),
498                                                        &krb_priv_rep);
499                 ap_rep.length = 0;
500                 if (ret) {
501                         goto reply;
502                 }
503                 talloc_free(tmp_ctx);
504                 return ret;
505         }
506         
507         /* We don't strictly need to call this wrapper, and could call
508          * gensec_server_start directly, as we have no need for NTLM
509          * and we have a PAC, but this ensures that the wrapper can be
510          * safely extended for other helpful things in future */
511         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx, 
512                                               kdc->task->msg_ctx,
513                                               kdc->task->lp_ctx,
514                                               server_credentials,
515                                               "kpasswd", 
516                                               &gensec_security);
517         if (!NT_STATUS_IS_OK(nt_status)) {
518                 talloc_free(tmp_ctx);
519                 return false;
520         }
521
522         /* The kerberos PRIV packets include these addresses.  MIT
523          * clients check that they are present */
524 #if 0
525         /* Skip this part for now, it breaks with a NetAPP filer and
526          * in any case where the client address is behind NAT.  If
527          * older MIT clients need this, we might have to insert more
528          * complex code */
529
530         nt_status = gensec_set_peer_addr(gensec_security, peer_addr);
531         if (!NT_STATUS_IS_OK(nt_status)) {
532                 talloc_free(tmp_ctx);
533                 return false;
534         }
535 #endif
536
537         socklen = tsocket_address_bsd_sockaddr(my_addr, (struct sockaddr *) &ss,
538                                 sizeof(struct sockaddr_storage));
539         if (socklen < 0) {
540                 talloc_free(tmp_ctx);
541                 return false;
542         }
543         socket_address = socket_address_from_sockaddr(tmp_ctx,
544                         (struct sockaddr *) &ss, socklen);
545         if (socket_address == NULL) {
546                 talloc_free(tmp_ctx);
547                 return false;
548         }
549
550         nt_status = gensec_set_my_addr(gensec_security, socket_address);
551         if (!NT_STATUS_IS_OK(nt_status)) {
552                 talloc_free(tmp_ctx);
553                 return false;
554         }
555
556         /* We want the GENSEC wrap calls to generate PRIV tokens */
557         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
558
559         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
560         if (!NT_STATUS_IS_OK(nt_status)) {
561                 talloc_free(tmp_ctx);
562                 return false;
563         }
564
565         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
566         nt_status = gensec_update(gensec_security, tmp_ctx, ap_req, &ap_rep);
567         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
568                 
569                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
570                                                        KRB5_KPASSWD_HARDERROR,
571                                                        talloc_asprintf(mem_ctx, 
572                                                                        "gensec_update failed: %s", 
573                                                                        nt_errstr(nt_status)),
574                                                        &krb_priv_rep);
575                 ap_rep.length = 0;
576                 if (ret) {
577                         goto reply;
578                 }
579                 talloc_free(tmp_ctx);
580                 return ret;
581         }
582
583         /* Extract the data from the KRB-PRIV half of the message */
584         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
585         if (!NT_STATUS_IS_OK(nt_status)) {
586                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
587                                                        KRB5_KPASSWD_HARDERROR,
588                                                        talloc_asprintf(mem_ctx, 
589                                                                        "gensec_unwrap failed: %s", 
590                                                                        nt_errstr(nt_status)),
591                                                        &krb_priv_rep);
592                 ap_rep.length = 0;
593                 if (ret) {
594                         goto reply;
595                 }
596                 talloc_free(tmp_ctx);
597                 return ret;
598         }
599
600         /* Figure out something to do with it (probably changing a password...) */
601         ret = kpasswd_process_request(kdc, tmp_ctx, 
602                                       gensec_security, 
603                                       version, 
604                                       &kpasswd_req, &kpasswd_rep); 
605         if (!ret) {
606                 /* Argh! */
607                 return false;
608         }
609
610         /* And wrap up the reply: This ensures that the error message
611          * or success can be verified by the client */
612         nt_status = gensec_wrap(gensec_security, tmp_ctx, 
613                                 &kpasswd_rep, &krb_priv_rep);
614         if (!NT_STATUS_IS_OK(nt_status)) {
615                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
616                                                        KRB5_KPASSWD_HARDERROR,
617                                                        talloc_asprintf(mem_ctx, 
618                                                                        "gensec_wrap failed: %s", 
619                                                                        nt_errstr(nt_status)),
620                                                        &krb_priv_rep);
621                 ap_rep.length = 0;
622                 if (ret) {
623                         goto reply;
624                 }
625                 talloc_free(tmp_ctx);
626                 return ret;
627         }
628         
629 reply:
630         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
631         if (!reply->data) {
632                 return false;
633         }
634
635         RSSVAL(reply->data, 0, reply->length);
636         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
637         RSSVAL(reply->data, 4, ap_rep.length);
638         memcpy(reply->data + header_len, 
639                ap_rep.data, 
640                ap_rep.length);
641         memcpy(reply->data + header_len + ap_rep.length, 
642                krb_priv_rep.data, 
643                krb_priv_rep.length);
644
645         talloc_free(tmp_ctx);
646         return ret;
647 }
648