More spelling fixes across source4/
[samba.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 success) 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 = dsdb_replace(samdb, msg, 0);
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         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
440
441         char *keytab_name;
442
443         if (!tmp_ctx) {
444                 return false;
445         }
446
447         /* Be parinoid.  We need to ensure we don't just let the
448          * caller lead us into a buffer overflow */
449         if (input->length <= header_len) {
450                 talloc_free(tmp_ctx);
451                 return false;
452         }
453
454         len = RSVAL(input->data, 0);
455         if (input->length != len) {
456                 talloc_free(tmp_ctx);
457                 return false;
458         }
459
460         /* There are two different versions of this protocol so far,
461          * plus others in the standards pipe.  Fortunetly they all
462          * take a very similar framing */
463         version = RSVAL(input->data, 2);
464         ap_req_len = RSVAL(input->data, 4);
465         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
466                 talloc_free(tmp_ctx);
467                 return false;
468         }
469
470         krb_priv_len = len - ap_req_len;
471         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
472         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
473
474         server_credentials = cli_credentials_init(tmp_ctx);
475         if (!server_credentials) {
476                 DEBUG(1, ("Failed to init server credentials\n"));
477                 return false;
478         }
479
480         /* We want the credentials subsystem to use the krb5 context
481          * we already have, rather than a new context */
482         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
483         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
484
485         keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->base_ctx);
486
487         cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
488         ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->event_ctx, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
489         if (ret != 0) {
490                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx,
491                                                        KRB5_KPASSWD_HARDERROR,
492                                                        talloc_asprintf(mem_ctx,
493                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n",
494                                                                        nt_errstr(nt_status)),
495                                                        &krb_priv_rep);
496                 ap_rep.length = 0;
497                 if (ret) {
498                         goto reply;
499                 }
500                 talloc_free(tmp_ctx);
501                 return ret;
502         }
503
504         /* We don't strictly need to call this wrapper, and could call
505          * gensec_server_start directly, as we have no need for NTLM
506          * and we have a PAC, but this ensures that the wrapper can be
507          * safely extended for other helpful things in future */
508         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx,
509                                               kdc->task->msg_ctx,
510                                               kdc->task->lp_ctx,
511                                               server_credentials,
512                                               "kpasswd",
513                                               &gensec_security);
514         if (!NT_STATUS_IS_OK(nt_status)) {
515                 talloc_free(tmp_ctx);
516                 return false;
517         }
518
519         /* The kerberos PRIV packets include these addresses.  MIT
520          * clients check that they are present */
521 #if 0
522         /* Skip this part for now, it breaks with a NetAPP filer and
523          * in any case where the client address is behind NAT.  If
524          * older MIT clients need this, we might have to insert more
525          * complex code */
526
527         nt_status = gensec_set_local_address(gensec_security, peer_addr);
528         if (!NT_STATUS_IS_OK(nt_status)) {
529                 talloc_free(tmp_ctx);
530                 return false;
531         }
532 #endif
533
534         nt_status = gensec_set_local_address(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