tsocket: Fixed tsocket_guide.txt asciidoc syntax.
[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 "system/network.h"
28 #include "../lib/util/dlinklist.h"
29 #include "lib/ldb/include/ldb.h"
30 #include "auth/gensec/gensec.h"
31 #include "auth/credentials/credentials.h"
32 #include "auth/credentials/credentials_krb5.h"
33 #include "auth/auth.h"
34 #include "dsdb/samdb/samdb.h"
35 #include "rpc_server/dcerpc_server.h"
36 #include "rpc_server/samr/proto.h"
37 #include "libcli/security/security.h"
38 #include "param/param.h"
39 #include "kdc/kdc.h"
40
41 /* TODO: remove all SAMBA4_INTERNAL_HEIMDAL stuff from this file */
42 #ifdef SAMBA4_INTERNAL_HEIMDAL
43 #include "heimdal_build/kpasswdd-glue.h"
44 #endif
45
46 /* Return true if there is a valid error packet formed in the error_blob */
47 static bool kpasswdd_make_error_reply(struct kdc_server *kdc, 
48                                      TALLOC_CTX *mem_ctx, 
49                                      uint16_t result_code, 
50                                      const char *error_string, 
51                                      DATA_BLOB *error_blob) 
52 {
53         char *error_string_utf8;
54         size_t len;
55         
56         DEBUG(result_code ? 3 : 10, ("kpasswdd: %s\n", error_string));
57
58         if (!push_utf8_talloc(mem_ctx, &error_string_utf8, error_string, &len)) {
59                 return false;
60         }
61
62         *error_blob = data_blob_talloc(mem_ctx, NULL, 2 + len + 1);
63         if (!error_blob->data) {
64                 return false;
65         }
66         RSSVAL(error_blob->data, 0, result_code);
67         memcpy(error_blob->data + 2, error_string_utf8, len + 1);
68         return true;
69 }
70
71 /* Return true if there is a valid error packet formed in the error_blob */
72 static bool kpasswdd_make_unauth_error_reply(struct kdc_server *kdc, 
73                                             TALLOC_CTX *mem_ctx, 
74                                             uint16_t result_code, 
75                                             const char *error_string, 
76                                             DATA_BLOB *error_blob) 
77 {
78         bool ret;
79         int kret;
80         DATA_BLOB error_bytes;
81         krb5_data k5_error_bytes, k5_error_blob;
82         ret = kpasswdd_make_error_reply(kdc, mem_ctx, result_code, error_string, 
83                                        &error_bytes);
84         if (!ret) {
85                 return false;
86         }
87         k5_error_bytes.data = error_bytes.data;
88         k5_error_bytes.length = error_bytes.length;
89         kret = krb5_mk_error(kdc->smb_krb5_context->krb5_context,
90                              result_code, NULL, &k5_error_bytes, 
91                              NULL, NULL, NULL, NULL, &k5_error_blob);
92         if (kret) {
93                 return false;
94         }
95         *error_blob = data_blob_talloc(mem_ctx, k5_error_blob.data, k5_error_blob.length);
96         krb5_data_free(&k5_error_blob);
97         if (!error_blob->data) {
98                 return false;
99         }
100         return true;
101 }
102
103 static bool kpasswd_make_pwchange_reply(struct kdc_server *kdc, 
104                                         TALLOC_CTX *mem_ctx, 
105                                         NTSTATUS status, 
106                                         enum samPwdChangeReason reject_reason,
107                                         struct samr_DomInfo1 *dominfo,
108                                         DATA_BLOB *error_blob) 
109 {
110         if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
111                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
112                                                 KRB5_KPASSWD_ACCESSDENIED,
113                                                 "No such user when changing password",
114                                                 error_blob);
115         }
116         if (NT_STATUS_EQUAL(status, NT_STATUS_ACCESS_DENIED)) {
117                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
118                                                 KRB5_KPASSWD_ACCESSDENIED,
119                                                 "Not permitted to change password",
120                                                 error_blob);
121         }
122         if (dominfo && NT_STATUS_EQUAL(status, NT_STATUS_PASSWORD_RESTRICTION)) {
123                 const char *reject_string;
124                 switch (reject_reason) {
125                 case SAM_PWD_CHANGE_PASSWORD_TOO_SHORT:
126                         reject_string = talloc_asprintf(mem_ctx, "Password too short, password must be at least %d characters long",
127                                                         dominfo->min_password_length);
128                         break;
129                 case SAM_PWD_CHANGE_NOT_COMPLEX:
130                         reject_string = "Password does not meet complexity requirements";
131                         break;
132                 case SAM_PWD_CHANGE_PWD_IN_HISTORY:
133                         reject_string = "Password is already in password history";
134                         break;
135                 default:
136                         reject_string = talloc_asprintf(mem_ctx, "Password must be at least %d characters long, and cannot match any of your %d previous passwords",
137                                                         dominfo->min_password_length, dominfo->password_history_length);
138                         break;
139                 }
140                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
141                                                 KRB5_KPASSWD_SOFTERROR,
142                                                 reject_string,
143                                                 error_blob);
144         }
145         if (!NT_STATUS_IS_OK(status)) {
146                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
147                                                  KRB5_KPASSWD_HARDERROR,
148                                                  talloc_asprintf(mem_ctx, "failed to set password: %s", nt_errstr(status)),
149                                                  error_blob);
150                 
151         }
152         return kpasswdd_make_error_reply(kdc, mem_ctx, KRB5_KPASSWD_SUCCESS,
153                                         "Password changed",
154                                         error_blob);
155 }
156
157 /* 
158    A user password change
159    
160    Return true if there is a valid error packet (or sucess) formed in
161    the error_blob
162 */
163 static bool kpasswdd_change_password(struct kdc_server *kdc,
164                                      TALLOC_CTX *mem_ctx, 
165                                      struct auth_session_info *session_info,
166                                      const DATA_BLOB *password,
167                                      DATA_BLOB *reply)
168 {
169         NTSTATUS status;
170         enum samPwdChangeReason reject_reason;
171         struct samr_DomInfo1 *dominfo;
172         struct ldb_context *samdb;
173
174         samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, system_session(kdc->task->lp_ctx));
175         if (!samdb) {
176                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
177                                                 KRB5_KPASSWD_HARDERROR,
178                                                 "Failed to open samdb",
179                                                 reply);
180         }
181         
182         DEBUG(3, ("Changing password of %s\\%s (%s)\n", 
183                   session_info->server_info->domain_name,
184                   session_info->server_info->account_name,
185                   dom_sid_string(mem_ctx, session_info->security_token->user_sid)));
186
187         /* User password change */
188         status = samdb_set_password_sid(samdb, mem_ctx, 
189                                         session_info->security_token->user_sid,
190                                         password, NULL, NULL, 
191                                         true, /* this is a user password change */
192                                         &reject_reason,
193                                         &dominfo);
194         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
195                                            status, 
196                                            reject_reason,
197                                            dominfo, 
198                                            reply);
199
200 }
201
202 static bool kpasswd_process_request(struct kdc_server *kdc,
203                                     TALLOC_CTX *mem_ctx, 
204                                     struct gensec_security *gensec_security,
205                                     uint16_t version,
206                                     DATA_BLOB *input, 
207                                     DATA_BLOB *reply)
208 {
209         struct auth_session_info *session_info;
210         size_t pw_len;
211
212         if (!NT_STATUS_IS_OK(gensec_session_info(gensec_security, 
213                                                  &session_info))) {
214                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
215                                                 KRB5_KPASSWD_HARDERROR,
216                                                 "gensec_session_info failed!",
217                                                 reply);
218         }
219
220         switch (version) {
221         case KRB5_KPASSWD_VERS_CHANGEPW:
222         {
223                 DATA_BLOB password;
224                 if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), 
225                                                CH_UTF8, CH_UTF16, 
226                                                (const char *)input->data, 
227                                                input->length,
228                                                (void **)&password.data, &pw_len, false)) {
229                         return false;
230                 }
231                 password.length = pw_len;
232         
233                 return kpasswdd_change_password(kdc, mem_ctx, session_info, 
234                                                 &password, reply);
235                 break;
236         }
237         case KRB5_KPASSWD_VERS_SETPW:
238         {
239                 NTSTATUS status;
240                 enum samPwdChangeReason reject_reason = SAM_PWD_CHANGE_NO_ERROR;
241                 struct samr_DomInfo1 *dominfo = NULL;
242                 struct ldb_context *samdb;
243                 struct ldb_message *msg;
244                 krb5_context context = kdc->smb_krb5_context->krb5_context;
245
246                 ChangePasswdDataMS chpw;
247                 DATA_BLOB password;
248
249                 krb5_principal principal;
250                 char *set_password_on_princ;
251                 struct ldb_dn *set_password_on_dn;
252
253                 size_t len;
254                 int ret;
255
256                 msg = ldb_msg_new(mem_ctx);
257                 if (!msg) {
258                         return false;
259                 }
260
261                 ret = decode_ChangePasswdDataMS(input->data, input->length,
262                                                 &chpw, &len);
263                 if (ret) {
264                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
265                                                         KRB5_KPASSWD_MALFORMED,
266                                                         "failed to decode password change structure",
267                                                         reply);
268                 }
269                 
270                 if (!convert_string_talloc_convenience(mem_ctx, lp_iconv_convenience(kdc->task->lp_ctx), 
271                                                CH_UTF8, CH_UTF16, 
272                                                (const char *)chpw.newpasswd.data, 
273                                                chpw.newpasswd.length,
274                                                (void **)&password.data, &pw_len, false)) {
275                         free_ChangePasswdDataMS(&chpw);
276                         return false;
277                 }
278                 
279                 password.length = pw_len;
280         
281                 if ((chpw.targname && !chpw.targrealm) 
282                     || (!chpw.targname && chpw.targrealm)) {
283                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
284                                                         KRB5_KPASSWD_MALFORMED,
285                                                         "Realm and principal must be both present, or neither present",
286                                                         reply);
287                 }
288                 if (chpw.targname && chpw.targrealm) {
289 #ifdef SAMBA4_INTERNAL_HEIMDAL
290                         if (_krb5_principalname2krb5_principal(kdc->smb_krb5_context->krb5_context,
291                                                                &principal, *chpw.targname, 
292                                                                *chpw.targrealm) != 0) {
293                                 free_ChangePasswdDataMS(&chpw);
294                                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
295                                                                 KRB5_KPASSWD_MALFORMED,
296                                                                 "failed to extract principal to set",
297                                                                 reply);
298                                 
299                         }
300 #else /* SAMBA4_INTERNAL_HEIMDAL */
301                                 return kpasswdd_make_error_reply(kdc, mem_ctx,
302                                                                 KRB5_KPASSWD_BAD_VERSION,
303                                                                 "Operation Not Implemented",
304                                                                 reply);
305 #endif /* SAMBA4_INTERNAL_HEIMDAL */
306                 } else {
307                         free_ChangePasswdDataMS(&chpw);
308                         return kpasswdd_change_password(kdc, mem_ctx, session_info, 
309                                                         &password, reply);
310                 }
311                 free_ChangePasswdDataMS(&chpw);
312
313                 if (krb5_unparse_name(context, principal, &set_password_on_princ) != 0) {
314                         krb5_free_principal(context, principal);
315                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
316                                                         KRB5_KPASSWD_MALFORMED,
317                                                         "krb5_unparse_name failed!",
318                                                         reply);
319                 }
320                 
321                 krb5_free_principal(context, principal);
322                 
323                 samdb = samdb_connect(mem_ctx, kdc->task->event_ctx, kdc->task->lp_ctx, session_info);
324                 if (!samdb) {
325                         return kpasswdd_make_error_reply(kdc, mem_ctx, 
326                                                          KRB5_KPASSWD_HARDERROR,
327                                                          "Unable to open database!",
328                                                          reply);
329                 }
330
331                 DEBUG(3, ("%s\\%s (%s) is changing password of %s\n", 
332                           session_info->server_info->domain_name,
333                           session_info->server_info->account_name,
334                           dom_sid_string(mem_ctx, session_info->security_token->user_sid), 
335                           set_password_on_princ));
336                 ret = ldb_transaction_start(samdb);
337                 if (ret) {
338                         status = NT_STATUS_TRANSACTION_ABORTED;
339                         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
340                                                            status,
341                                                            SAM_PWD_CHANGE_NO_ERROR,
342                                                            NULL, 
343                                                            reply);
344                 }
345
346                 status = crack_user_principal_name(samdb, mem_ctx, 
347                                                    set_password_on_princ, 
348                                                    &set_password_on_dn, NULL);
349                 free(set_password_on_princ);
350                 if (!NT_STATUS_IS_OK(status)) {
351                         ldb_transaction_cancel(samdb);
352                         return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
353                                                            status,
354                                                            SAM_PWD_CHANGE_NO_ERROR,
355                                                            NULL, 
356                                                            reply);
357                 }
358
359                 msg = ldb_msg_new(mem_ctx);
360                 if (msg == NULL) {
361                         ldb_transaction_cancel(samdb);
362                         status = NT_STATUS_NO_MEMORY;
363                 } else {
364                         msg->dn = ldb_dn_copy(msg, set_password_on_dn);
365                         if (!msg->dn) {
366                                 status = NT_STATUS_NO_MEMORY;
367                         }
368                 }
369
370                 if (NT_STATUS_IS_OK(status)) {
371                         /* Admin password set */
372                         status = samdb_set_password(samdb, mem_ctx,
373                                                     set_password_on_dn, NULL,
374                                                     msg, &password, NULL, NULL, 
375                                                     false, /* this is not a user password change */
376                                                     &reject_reason, &dominfo);
377                 }
378
379                 if (NT_STATUS_IS_OK(status)) {
380                         /* modify the samdb record */
381                         ret = samdb_replace(samdb, mem_ctx, msg);
382                         if (ret != 0) {
383                                 DEBUG(2,("Failed to modify record to set password on %s: %s\n",
384                                          ldb_dn_get_linearized(msg->dn),
385                                          ldb_errstring(samdb)));
386                                 status = NT_STATUS_ACCESS_DENIED;
387                         }
388                 }
389                 if (NT_STATUS_IS_OK(status)) {
390                         ret = ldb_transaction_commit(samdb);
391                         if (ret != 0) {
392                                 DEBUG(1,("Failed to commit transaction to set password on %s: %s\n",
393                                          ldb_dn_get_linearized(msg->dn),
394                                          ldb_errstring(samdb)));
395                                 status = NT_STATUS_TRANSACTION_ABORTED;
396                         }
397                 } else {
398                         ldb_transaction_cancel(samdb);
399                 }
400                 return kpasswd_make_pwchange_reply(kdc, mem_ctx, 
401                                                    status,
402                                                    reject_reason, 
403                                                    dominfo, 
404                                                    reply);
405         }
406         default:
407                 return kpasswdd_make_error_reply(kdc, mem_ctx, 
408                                                  KRB5_KPASSWD_BAD_VERSION,
409                                                  talloc_asprintf(mem_ctx, 
410                                                                  "Protocol version %u not supported", 
411                                                                  version),
412                                                  reply);
413         }
414         return true;
415 }
416
417 bool kpasswdd_process(struct kdc_server *kdc,
418                       TALLOC_CTX *mem_ctx, 
419                       DATA_BLOB *input, 
420                       DATA_BLOB *reply,
421                       struct socket_address *peer_addr,
422                       struct socket_address *my_addr,
423                       int datagram_reply)
424 {
425         bool ret;
426         const uint16_t header_len = 6;
427         uint16_t len;
428         uint16_t ap_req_len;
429         uint16_t krb_priv_len;
430         uint16_t version;
431         NTSTATUS nt_status;
432         DATA_BLOB ap_req, krb_priv_req;
433         DATA_BLOB krb_priv_rep = data_blob(NULL, 0);
434         DATA_BLOB ap_rep = data_blob(NULL, 0);
435         DATA_BLOB kpasswd_req, kpasswd_rep;
436         struct cli_credentials *server_credentials;
437         struct gensec_security *gensec_security;
438         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
439
440         char *keytab_name;
441
442         if (!tmp_ctx) {
443                 return false;
444         }
445
446         /* Be parinoid.  We need to ensure we don't just let the
447          * caller lead us into a buffer overflow */
448         if (input->length <= header_len) {
449                 talloc_free(tmp_ctx);
450                 return false;
451         }
452
453         len = RSVAL(input->data, 0);
454         if (input->length != len) {
455                 talloc_free(tmp_ctx);
456                 return false;
457         }
458
459         /* There are two different versions of this protocol so far,
460          * plus others in the standards pipe.  Fortunetly they all
461          * take a very similar framing */
462         version = RSVAL(input->data, 2);
463         ap_req_len = RSVAL(input->data, 4);
464         if ((ap_req_len >= len) || (ap_req_len + header_len) >= len) {
465                 talloc_free(tmp_ctx);
466                 return false;
467         }
468         
469         krb_priv_len = len - ap_req_len;
470         ap_req = data_blob_const(&input->data[header_len], ap_req_len);
471         krb_priv_req = data_blob_const(&input->data[header_len + ap_req_len], krb_priv_len);
472         
473         server_credentials = cli_credentials_init(tmp_ctx);
474         if (!server_credentials) {
475                 DEBUG(1, ("Failed to init server credentials\n"));
476                 return false;
477         }
478
479         /* We want the credentials subsystem to use the krb5 context
480          * we already have, rather than a new context */        
481         cli_credentials_set_krb5_context(server_credentials, kdc->smb_krb5_context);
482         cli_credentials_set_conf(server_credentials, kdc->task->lp_ctx);
483
484         keytab_name = talloc_asprintf(server_credentials, "HDB:samba4&%p", kdc->hdb_samba4_context);
485
486         cli_credentials_set_username(server_credentials, "kadmin/changepw", CRED_SPECIFIED);
487         ret = cli_credentials_set_keytab_name(server_credentials, kdc->task->event_ctx, kdc->task->lp_ctx, keytab_name, CRED_SPECIFIED);
488         if (ret != 0) {
489                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
490                                                        KRB5_KPASSWD_HARDERROR,
491                                                        talloc_asprintf(mem_ctx, 
492                                                                        "Failed to obtain server credentials for kadmin/changepw: %s\n", 
493                                                                        nt_errstr(nt_status)),
494                                                        &krb_priv_rep);
495                 ap_rep.length = 0;
496                 if (ret) {
497                         goto reply;
498                 }
499                 talloc_free(tmp_ctx);
500                 return ret;
501         }
502         
503         /* We don't strictly need to call this wrapper, and could call
504          * gensec_server_start directly, as we have no need for NTLM
505          * and we have a PAC, but this ensures that the wrapper can be
506          * safely extended for other helpful things in future */
507         nt_status = samba_server_gensec_start(tmp_ctx, kdc->task->event_ctx, 
508                                               kdc->task->msg_ctx,
509                                               kdc->task->lp_ctx,
510                                               server_credentials,
511                                               "kpasswd", 
512                                               &gensec_security);
513         if (!NT_STATUS_IS_OK(nt_status)) {
514                 talloc_free(tmp_ctx);
515                 return false;
516         }
517
518         /* The kerberos PRIV packets include these addresses.  MIT
519          * clients check that they are present */
520 #if 0
521         /* Skip this part for now, it breaks with a NetAPP filer and
522          * in any case where the client address is behind NAT.  If
523          * older MIT clients need this, we might have to insert more
524          * complex code */
525
526         nt_status = gensec_set_peer_addr(gensec_security, peer_addr);
527         if (!NT_STATUS_IS_OK(nt_status)) {
528                 talloc_free(tmp_ctx);
529                 return false;
530         }
531 #endif
532
533         nt_status = gensec_set_my_addr(gensec_security, my_addr);
534         if (!NT_STATUS_IS_OK(nt_status)) {
535                 talloc_free(tmp_ctx);
536                 return false;
537         }
538
539         /* We want the GENSEC wrap calls to generate PRIV tokens */
540         gensec_want_feature(gensec_security, GENSEC_FEATURE_SEAL);
541
542         nt_status = gensec_start_mech_by_name(gensec_security, "krb5");
543         if (!NT_STATUS_IS_OK(nt_status)) {
544                 talloc_free(tmp_ctx);
545                 return false;
546         }
547
548         /* Accept the AP-REQ and generate teh AP-REP we need for the reply */
549         nt_status = gensec_update(gensec_security, tmp_ctx, ap_req, &ap_rep);
550         if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
551                 
552                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
553                                                        KRB5_KPASSWD_HARDERROR,
554                                                        talloc_asprintf(mem_ctx, 
555                                                                        "gensec_update failed: %s", 
556                                                                        nt_errstr(nt_status)),
557                                                        &krb_priv_rep);
558                 ap_rep.length = 0;
559                 if (ret) {
560                         goto reply;
561                 }
562                 talloc_free(tmp_ctx);
563                 return ret;
564         }
565
566         /* Extract the data from the KRB-PRIV half of the message */
567         nt_status = gensec_unwrap(gensec_security, tmp_ctx, &krb_priv_req, &kpasswd_req);
568         if (!NT_STATUS_IS_OK(nt_status)) {
569                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
570                                                        KRB5_KPASSWD_HARDERROR,
571                                                        talloc_asprintf(mem_ctx, 
572                                                                        "gensec_unwrap 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         /* Figure out something to do with it (probably changing a password...) */
584         ret = kpasswd_process_request(kdc, tmp_ctx, 
585                                       gensec_security, 
586                                       version, 
587                                       &kpasswd_req, &kpasswd_rep); 
588         if (!ret) {
589                 /* Argh! */
590                 return false;
591         }
592
593         /* And wrap up the reply: This ensures that the error message
594          * or success can be verified by the client */
595         nt_status = gensec_wrap(gensec_security, tmp_ctx, 
596                                 &kpasswd_rep, &krb_priv_rep);
597         if (!NT_STATUS_IS_OK(nt_status)) {
598                 ret = kpasswdd_make_unauth_error_reply(kdc, mem_ctx, 
599                                                        KRB5_KPASSWD_HARDERROR,
600                                                        talloc_asprintf(mem_ctx, 
601                                                                        "gensec_wrap failed: %s", 
602                                                                        nt_errstr(nt_status)),
603                                                        &krb_priv_rep);
604                 ap_rep.length = 0;
605                 if (ret) {
606                         goto reply;
607                 }
608                 talloc_free(tmp_ctx);
609                 return ret;
610         }
611         
612 reply:
613         *reply = data_blob_talloc(mem_ctx, NULL, krb_priv_rep.length + ap_rep.length + header_len);
614         if (!reply->data) {
615                 return false;
616         }
617
618         RSSVAL(reply->data, 0, reply->length);
619         RSSVAL(reply->data, 2, 1); /* This is a version 1 reply, MS change/set or otherwise */
620         RSSVAL(reply->data, 4, ap_rep.length);
621         memcpy(reply->data + header_len, 
622                ap_rep.data, 
623                ap_rep.length);
624         memcpy(reply->data + header_len + ap_rep.length, 
625                krb_priv_rep.data, 
626                krb_priv_rep.length);
627
628         talloc_free(tmp_ctx);
629         return ret;
630 }
631