source: branches/samba-3.5.x/source4/auth/kerberos/kerberos_util.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 19.5 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Kerberos utility functions for GENSEC
5
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
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 "system/kerberos.h"
25#include "auth/kerberos/kerberos.h"
26#include "auth/credentials/credentials.h"
27#include "auth/credentials/credentials_proto.h"
28#include "auth/credentials/credentials_krb5.h"
29
30struct principal_container {
31 struct smb_krb5_context *smb_krb5_context;
32 krb5_principal principal;
33};
34
35static krb5_error_code free_principal(struct principal_container *pc)
36{
37 /* current heimdal - 0.6.3, which we need anyway, fixes segfaults here */
38 krb5_free_principal(pc->smb_krb5_context->krb5_context, pc->principal);
39
40 return 0;
41}
42
43static krb5_error_code salt_principal_from_credentials(TALLOC_CTX *parent_ctx,
44 struct cli_credentials *machine_account,
45 struct smb_krb5_context *smb_krb5_context,
46 krb5_principal *salt_princ)
47{
48 krb5_error_code ret;
49 char *machine_username;
50 char *salt_body;
51 char *lower_realm;
52 const char *salt_principal;
53 struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
54 if (!mem_ctx) {
55 return ENOMEM;
56 }
57
58 salt_principal = cli_credentials_get_salt_principal(machine_account);
59 if (salt_principal) {
60 ret = krb5_parse_name(smb_krb5_context->krb5_context, salt_principal, salt_princ);
61 } else {
62 machine_username = talloc_strdup(mem_ctx, cli_credentials_get_username(machine_account));
63
64 if (!machine_username) {
65 talloc_free(mem_ctx);
66 return ENOMEM;
67 }
68
69 if (machine_username[strlen(machine_username)-1] == '$') {
70 machine_username[strlen(machine_username)-1] = '\0';
71 }
72 lower_realm = strlower_talloc(mem_ctx, cli_credentials_get_realm(machine_account));
73 if (!lower_realm) {
74 talloc_free(mem_ctx);
75 return ENOMEM;
76 }
77
78 salt_body = talloc_asprintf(mem_ctx, "%s.%s", machine_username,
79 lower_realm);
80 if (!salt_body) {
81 talloc_free(mem_ctx);
82 return ENOMEM;
83 }
84
85 ret = krb5_make_principal(smb_krb5_context->krb5_context, salt_princ,
86 cli_credentials_get_realm(machine_account),
87 "host", salt_body, NULL);
88 }
89
90 if (ret == 0) {
91 /* This song-and-dance effectivly puts the principal
92 * into talloc, so we can't loose it. */
93 mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
94 mem_ctx->principal = *salt_princ;
95 talloc_set_destructor(mem_ctx, free_principal);
96 }
97 return ret;
98}
99
100/* Obtain the principal set on this context. Requires a
101 * smb_krb5_context because we are doing krb5 principal parsing with
102 * the library routines. The returned princ is placed in the talloc
103 * system by means of a destructor (do *not* free). */
104
105 krb5_error_code principal_from_credentials(TALLOC_CTX *parent_ctx,
106 struct cli_credentials *credentials,
107 struct smb_krb5_context *smb_krb5_context,
108 krb5_principal *princ)
109{
110 krb5_error_code ret;
111 const char *princ_string;
112 struct principal_container *mem_ctx = talloc(parent_ctx, struct principal_container);
113 if (!mem_ctx) {
114 return ENOMEM;
115 }
116
117 princ_string = cli_credentials_get_principal(credentials, mem_ctx);
118
119 /* A NULL here has meaning, as the gssapi server case will
120 * then use the principal from the client */
121 if (!princ_string) {
122 talloc_free(mem_ctx);
123 princ = NULL;
124 return 0;
125 }
126
127 ret = krb5_parse_name(smb_krb5_context->krb5_context,
128 princ_string, princ);
129
130 if (ret == 0) {
131 /* This song-and-dance effectivly puts the principal
132 * into talloc, so we can't loose it. */
133 mem_ctx->smb_krb5_context = talloc_reference(mem_ctx, smb_krb5_context);
134 mem_ctx->principal = *princ;
135 talloc_set_destructor(mem_ctx, free_principal);
136 }
137 return ret;
138}
139
140/**
141 * Return a freshly allocated ccache (destroyed by destructor on child
142 * of parent_ctx), for a given set of client credentials
143 */
144
145 krb5_error_code kinit_to_ccache(TALLOC_CTX *parent_ctx,
146 struct cli_credentials *credentials,
147 struct smb_krb5_context *smb_krb5_context,
148 krb5_ccache ccache)
149{
150 krb5_error_code ret;
151 const char *password;
152 time_t kdc_time = 0;
153 krb5_principal princ;
154 int tries;
155 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
156
157 if (!mem_ctx) {
158 return ENOMEM;
159 }
160
161 ret = principal_from_credentials(mem_ctx, credentials, smb_krb5_context, &princ);
162 if (ret) {
163 talloc_free(mem_ctx);
164 return ret;
165 }
166
167 password = cli_credentials_get_password(credentials);
168
169 tries = 2;
170 while (tries--) {
171 if (password) {
172 ret = kerberos_kinit_password_cc(smb_krb5_context->krb5_context, ccache,
173 princ,
174 password, NULL, &kdc_time);
175 } else {
176 /* No password available, try to use a keyblock instead */
177
178 krb5_keyblock keyblock;
179 const struct samr_Password *mach_pwd;
180 mach_pwd = cli_credentials_get_nt_hash(credentials, mem_ctx);
181 if (!mach_pwd) {
182 talloc_free(mem_ctx);
183 DEBUG(1, ("kinit_to_ccache: No password available for kinit\n"));
184 return EINVAL;
185 }
186 ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
187 ENCTYPE_ARCFOUR_HMAC,
188 mach_pwd->hash, sizeof(mach_pwd->hash),
189 &keyblock);
190
191 if (ret == 0) {
192 ret = kerberos_kinit_keyblock_cc(smb_krb5_context->krb5_context, ccache,
193 princ,
194 &keyblock, NULL, &kdc_time);
195 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &keyblock);
196 }
197 }
198
199 if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
200 /* Perhaps we have been given an invalid skew, so try again without it */
201 time_t t = time(NULL);
202 krb5_set_real_time(smb_krb5_context->krb5_context, t, 0);
203 } else {
204 /* not a skew problem */
205 break;
206 }
207 }
208
209 if (ret == KRB5KRB_AP_ERR_SKEW || ret == KRB5_KDCREP_SKEW) {
210 DEBUG(1,("kinit for %s failed (%s)\n",
211 cli_credentials_get_principal(credentials, mem_ctx),
212 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
213 ret, mem_ctx)));
214 talloc_free(mem_ctx);
215 return ret;
216 }
217
218 /* cope with ticket being in the future due to clock skew */
219 if ((unsigned)kdc_time > time(NULL)) {
220 time_t t = time(NULL);
221 int time_offset =(unsigned)kdc_time-t;
222 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
223 krb5_set_real_time(smb_krb5_context->krb5_context, t + time_offset + 1, 0);
224 }
225
226 if (ret == KRB5KDC_ERR_PREAUTH_FAILED && cli_credentials_wrong_password(credentials)) {
227 ret = kinit_to_ccache(parent_ctx,
228 credentials,
229 smb_krb5_context,
230 ccache);
231 }
232 if (ret) {
233 DEBUG(1,("kinit for %s failed (%s)\n",
234 cli_credentials_get_principal(credentials, mem_ctx),
235 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
236 ret, mem_ctx)));
237 talloc_free(mem_ctx);
238 return ret;
239 }
240 talloc_free(mem_ctx);
241 return 0;
242}
243
244static krb5_error_code free_keytab(struct keytab_container *ktc)
245{
246 return krb5_kt_close(ktc->smb_krb5_context->krb5_context, ktc->keytab);
247}
248
249krb5_error_code smb_krb5_open_keytab(TALLOC_CTX *mem_ctx,
250 struct smb_krb5_context *smb_krb5_context,
251 const char *keytab_name, struct keytab_container **ktc)
252{
253 krb5_keytab keytab;
254 krb5_error_code ret;
255 ret = krb5_kt_resolve(smb_krb5_context->krb5_context, keytab_name, &keytab);
256 if (ret) {
257 DEBUG(1,("failed to open krb5 keytab: %s\n",
258 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
259 ret, mem_ctx)));
260 return ret;
261 }
262
263 *ktc = talloc(mem_ctx, struct keytab_container);
264 if (!*ktc) {
265 return ENOMEM;
266 }
267
268 (*ktc)->smb_krb5_context = talloc_reference(*ktc, smb_krb5_context);
269 (*ktc)->keytab = keytab;
270 talloc_set_destructor(*ktc, free_keytab);
271
272 return 0;
273}
274
275static krb5_error_code keytab_add_keys(TALLOC_CTX *parent_ctx,
276 const char *princ_string,
277 krb5_principal princ,
278 krb5_principal salt_princ,
279 int kvno,
280 const char *password_s,
281 struct smb_krb5_context *smb_krb5_context,
282 const char **enctype_strings,
283 krb5_keytab keytab)
284{
285 int i;
286 krb5_error_code ret;
287 krb5_data password;
288 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
289 if (!mem_ctx) {
290 return ENOMEM;
291 }
292
293 password.data = discard_const_p(char *, password_s);
294 password.length = strlen(password_s);
295
296 for (i=0; enctype_strings[i]; i++) {
297 krb5_keytab_entry entry;
298 krb5_enctype enctype;
299 ret = krb5_string_to_enctype(smb_krb5_context->krb5_context, enctype_strings[i], &enctype);
300 if (ret != 0) {
301 DEBUG(1, ("Failed to interpret %s as a krb5 encryption type: %s\n",
302 enctype_strings[i],
303 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
304 ret, mem_ctx)));
305 talloc_free(mem_ctx);
306 return ret;
307 }
308 ret = create_kerberos_key_from_string(smb_krb5_context->krb5_context,
309 salt_princ, &password, &entry.keyblock, enctype);
310 if (ret != 0) {
311 talloc_free(mem_ctx);
312 return ret;
313 }
314
315 entry.principal = princ;
316 entry.vno = kvno;
317 ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
318 if (ret != 0) {
319 DEBUG(1, ("Failed to add %s entry for %s(kvno %d) to keytab: %s\n",
320 enctype_strings[i],
321 princ_string,
322 kvno,
323 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
324 ret, mem_ctx)));
325 talloc_free(mem_ctx);
326 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
327 return ret;
328 }
329
330 DEBUG(5, ("Added %s(kvno %d) to keytab (%s)\n",
331 princ_string, kvno,
332 enctype_strings[i]));
333
334 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
335 }
336 talloc_free(mem_ctx);
337 return 0;
338}
339
340static krb5_error_code create_keytab(TALLOC_CTX *parent_ctx,
341 struct cli_credentials *machine_account,
342 struct smb_krb5_context *smb_krb5_context,
343 const char **enctype_strings,
344 krb5_keytab keytab,
345 bool add_old)
346{
347 krb5_error_code ret;
348 const char *password_s;
349 const char *old_secret;
350 int kvno;
351 krb5_principal salt_princ;
352 krb5_principal princ;
353 const char *princ_string;
354
355 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
356 if (!mem_ctx) {
357 return ENOMEM;
358 }
359
360 princ_string = cli_credentials_get_principal(machine_account, mem_ctx);
361 /* Get the principal we will store the new keytab entries under */
362 ret = principal_from_credentials(mem_ctx, machine_account, smb_krb5_context, &princ);
363 if (ret) {
364 DEBUG(1,("create_keytab: makeing krb5 principal failed (%s)\n",
365 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
366 ret, mem_ctx)));
367 talloc_free(mem_ctx);
368 return ret;
369 }
370
371 /* The salt used to generate these entries may be different however, fetch that */
372 ret = salt_principal_from_credentials(mem_ctx, machine_account,
373 smb_krb5_context,
374 &salt_princ);
375 if (ret) {
376 DEBUG(1,("create_keytab: makeing salt principal failed (%s)\n",
377 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
378 ret, mem_ctx)));
379 talloc_free(mem_ctx);
380 return ret;
381 }
382
383 /* Finally, do the dance to get the password to put in the entry */
384 password_s = cli_credentials_get_password(machine_account);
385 if (!password_s) {
386 krb5_keytab_entry entry;
387 const struct samr_Password *mach_pwd;
388
389 if (!str_list_check(enctype_strings, "arcfour-hmac-md5")) {
390 DEBUG(1, ("Asked to create keytab, but with only an NT hash supplied, "
391 "but not listing arcfour-hmac-md5 as an enc type to include in the keytab!\n"));
392 talloc_free(mem_ctx);
393 return EINVAL;
394 }
395
396 /* If we don't have the plaintext password, try for
397 * the MD4 password hash */
398 mach_pwd = cli_credentials_get_nt_hash(machine_account, mem_ctx);
399 if (!mach_pwd) {
400 /* OK, nothing to do here */
401 talloc_free(mem_ctx);
402 return 0;
403 }
404 ret = krb5_keyblock_init(smb_krb5_context->krb5_context,
405 ETYPE_ARCFOUR_HMAC_MD5,
406 mach_pwd->hash, sizeof(mach_pwd->hash),
407 &entry.keyblock);
408 if (ret) {
409 DEBUG(1, ("create_keytab: krb5_keyblock_init failed: %s\n",
410 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
411 ret, mem_ctx)));
412 talloc_free(mem_ctx);
413 return ret;
414 }
415
416 entry.principal = princ;
417 entry.vno = cli_credentials_get_kvno(machine_account);
418 ret = krb5_kt_add_entry(smb_krb5_context->krb5_context, keytab, &entry);
419 if (ret) {
420 DEBUG(1, ("Failed to add ARCFOUR_HMAC (only) entry for %s to keytab: %s",
421 cli_credentials_get_principal(machine_account, mem_ctx),
422 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
423 ret, mem_ctx)));
424 talloc_free(mem_ctx);
425 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
426 return ret;
427 }
428
429 DEBUG(5, ("Added %s(kvno %d) to keytab (arcfour-hmac-md5)\n",
430 cli_credentials_get_principal(machine_account, mem_ctx),
431 cli_credentials_get_kvno(machine_account)));
432
433 krb5_free_keyblock_contents(smb_krb5_context->krb5_context, &entry.keyblock);
434
435 /* Can't go any further, we only have this one key */
436 talloc_free(mem_ctx);
437 return 0;
438 }
439
440 kvno = cli_credentials_get_kvno(machine_account);
441 /* good, we actually have the real plaintext */
442 ret = keytab_add_keys(mem_ctx, princ_string, princ, salt_princ,
443 kvno, password_s, smb_krb5_context,
444 enctype_strings, keytab);
445 if (!ret) {
446 talloc_free(mem_ctx);
447 return ret;
448 }
449
450 if (!add_old || kvno == 0) {
451 talloc_free(mem_ctx);
452 return 0;
453 }
454
455 old_secret = cli_credentials_get_old_password(machine_account);
456 if (!old_secret) {
457 talloc_free(mem_ctx);
458 return 0;
459 }
460
461 ret = keytab_add_keys(mem_ctx, princ_string, princ, salt_princ,
462 kvno - 1, old_secret, smb_krb5_context,
463 enctype_strings, keytab);
464 if (!ret) {
465 talloc_free(mem_ctx);
466 return ret;
467 }
468
469 talloc_free(mem_ctx);
470 return 0;
471}
472
473
474/*
475 * Walk the keytab, looking for entries of this principal name, with KVNO other than current kvno -1.
476 *
477 * These entries are now stale, we only keep the current, and previous entries around.
478 *
479 * Inspired by the code in Samba3 for 'use kerberos keytab'.
480 *
481 */
482
483static krb5_error_code remove_old_entries(TALLOC_CTX *parent_ctx,
484 struct cli_credentials *machine_account,
485 struct smb_krb5_context *smb_krb5_context,
486 krb5_keytab keytab, bool *found_previous)
487{
488 krb5_error_code ret, ret2;
489 krb5_kt_cursor cursor;
490 krb5_principal princ;
491 int kvno;
492 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
493 const char *princ_string;
494 if (!mem_ctx) {
495 return ENOMEM;
496 }
497
498 *found_previous = false;
499 princ_string = cli_credentials_get_principal(machine_account, mem_ctx);
500
501 /* Get the principal we will store the new keytab entries under */
502 ret = principal_from_credentials(mem_ctx, machine_account, smb_krb5_context, &princ);
503 if (ret) {
504 DEBUG(1,("update_keytab: makeing krb5 principal failed (%s)\n",
505 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
506 ret, mem_ctx)));
507 talloc_free(mem_ctx);
508 return ret;
509 }
510
511 kvno = cli_credentials_get_kvno(machine_account);
512
513 /* for each entry in the keytab */
514 ret = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
515 switch (ret) {
516 case 0:
517 break;
518 case HEIM_ERR_OPNOTSUPP:
519 case ENOENT:
520 case KRB5_KT_END:
521 /* no point enumerating if there isn't anything here */
522 talloc_free(mem_ctx);
523 return 0;
524 default:
525 DEBUG(1,("failed to open keytab for read of old entries: %s\n",
526 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
527 ret, mem_ctx)));
528 talloc_free(mem_ctx);
529 return ret;
530 }
531
532 while (!ret) {
533 krb5_keytab_entry entry;
534 ret = krb5_kt_next_entry(smb_krb5_context->krb5_context, keytab, &entry, &cursor);
535 if (ret) {
536 break;
537 }
538 /* if it matches our principal */
539 if (!krb5_kt_compare(smb_krb5_context->krb5_context, &entry, princ, 0, 0)) {
540 /* Free the entry, it wasn't the one we were looking for anyway */
541 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
542 continue;
543 }
544
545 /* delete it, if it is not kvno -1 */
546 if (entry.vno != (kvno - 1 )) {
547 /* Release the enumeration. We are going to
548 * have to start this from the top again,
549 * because deletes during enumeration may not
550 * always be consistant.
551 *
552 * Also, the enumeration locks a FILE: keytab
553 */
554
555 krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
556
557 ret = krb5_kt_remove_entry(smb_krb5_context->krb5_context, keytab, &entry);
558 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
559
560 /* Deleted: Restart from the top */
561 ret2 = krb5_kt_start_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
562 if (ret2) {
563 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
564 DEBUG(1,("failed to restart enumeration of keytab: %s\n",
565 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
566 ret, mem_ctx)));
567
568 talloc_free(mem_ctx);
569 return ret2;
570 }
571
572 if (ret) {
573 break;
574 }
575
576 } else {
577 *found_previous = true;
578 }
579
580 /* Free the entry, we don't need it any more */
581 krb5_kt_free_entry(smb_krb5_context->krb5_context, &entry);
582
583
584 }
585 krb5_kt_end_seq_get(smb_krb5_context->krb5_context, keytab, &cursor);
586
587 switch (ret) {
588 case 0:
589 break;
590 case ENOENT:
591 case KRB5_KT_END:
592 ret = 0;
593 break;
594 default:
595 DEBUG(1,("failed in deleting old entries for principal: %s: %s\n",
596 princ_string,
597 smb_get_krb5_error_message(smb_krb5_context->krb5_context,
598 ret, mem_ctx)));
599 }
600 talloc_free(mem_ctx);
601 return ret;
602}
603
604krb5_error_code smb_krb5_update_keytab(TALLOC_CTX *parent_ctx,
605 struct cli_credentials *machine_account,
606 struct smb_krb5_context *smb_krb5_context,
607 const char **enctype_strings,
608 struct keytab_container *keytab_container)
609{
610 krb5_error_code ret;
611 bool found_previous;
612 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
613 if (!mem_ctx) {
614 return ENOMEM;
615 }
616
617 ret = remove_old_entries(mem_ctx, machine_account,
618 smb_krb5_context, keytab_container->keytab, &found_previous);
619 if (ret != 0) {
620 talloc_free(mem_ctx);
621 return ret;
622 }
623
624 /* Create a new keytab. If during the cleanout we found
625 * entires for kvno -1, then don't try and duplicate them.
626 * Otherwise, add kvno, and kvno -1 */
627
628 ret = create_keytab(mem_ctx, machine_account, smb_krb5_context,
629 enctype_strings,
630 keytab_container->keytab,
631 found_previous ? false : true);
632 talloc_free(mem_ctx);
633 return ret;
634}
635
636krb5_error_code smb_krb5_create_memory_keytab(TALLOC_CTX *parent_ctx,
637 struct cli_credentials *machine_account,
638 struct smb_krb5_context *smb_krb5_context,
639 const char **enctype_strings,
640 struct keytab_container **keytab_container)
641{
642 krb5_error_code ret;
643 TALLOC_CTX *mem_ctx = talloc_new(parent_ctx);
644 const char *rand_string;
645 const char *keytab_name;
646 if (!mem_ctx) {
647 return ENOMEM;
648 }
649
650 *keytab_container = talloc(mem_ctx, struct keytab_container);
651
652 rand_string = generate_random_str(mem_ctx, 16);
653 if (!rand_string) {
654 talloc_free(mem_ctx);
655 return ENOMEM;
656 }
657
658 keytab_name = talloc_asprintf(mem_ctx, "MEMORY:%s",
659 rand_string);
660 if (!keytab_name) {
661 talloc_free(mem_ctx);
662 return ENOMEM;
663 }
664
665 ret = smb_krb5_open_keytab(mem_ctx, smb_krb5_context, keytab_name, keytab_container);
666 if (ret) {
667 return ret;
668 }
669
670 ret = smb_krb5_update_keytab(mem_ctx, machine_account, smb_krb5_context, enctype_strings, *keytab_container);
671 if (ret == 0) {
672 talloc_steal(parent_ctx, *keytab_container);
673 } else {
674 *keytab_container = NULL;
675 }
676 talloc_free(mem_ctx);
677 return ret;
678}
679
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