2 Unix SMB/CIFS implementation.
4 Kerberos utility functions for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
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.
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.
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/>.
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 #include "auth/kerberos/kerberos_credentials.h"
30 #include "auth/kerberos/kerberos_util.h"
32 #include "param/secrets.h"
34 struct principal_container
{
35 struct smb_krb5_context
*smb_krb5_context
;
36 krb5_principal principal
;
37 const char *string_form
; /* Optional */
40 static krb5_error_code
free_principal(struct principal_container
*pc
)
42 /* current heimdal - 0.6.3, which we need anyway, fixes segfaults here */
43 krb5_free_principal(pc
->smb_krb5_context
->krb5_context
, pc
->principal
);
49 static krb5_error_code
parse_principal(TALLOC_CTX
*parent_ctx
,
50 const char *princ_string
,
51 struct smb_krb5_context
*smb_krb5_context
,
52 krb5_principal
*princ
,
53 const char **error_string
)
56 struct principal_container
*mem_ctx
;
57 if (princ_string
== NULL
) {
62 ret
= krb5_parse_name(smb_krb5_context
->krb5_context
,
66 (*error_string
) = smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, parent_ctx
);
70 mem_ctx
= talloc(parent_ctx
, struct principal_container
);
72 (*error_string
) = error_message(ENOMEM
);
76 /* This song-and-dance effectivly puts the principal
77 * into talloc, so we can't loose it. */
78 mem_ctx
->smb_krb5_context
= talloc_reference(mem_ctx
, smb_krb5_context
);
79 mem_ctx
->principal
= *princ
;
80 talloc_set_destructor(mem_ctx
, free_principal
);
84 static krb5_error_code
principals_from_msg(TALLOC_CTX
*parent_ctx
,
85 struct ldb_message
*msg
,
86 struct smb_krb5_context
*smb_krb5_context
,
87 struct principal_container
***principals_out
,
88 const char **error_string
)
93 const char *realm
= ldb_msg_find_attr_as_string(msg
, "realm", NULL
);
94 const char *samAccountName
= ldb_msg_find_attr_as_string(msg
, "samAccountName", NULL
);
95 struct ldb_message_element
*spn_el
= ldb_msg_find_element(msg
, "servicePrincipalName");
97 struct principal_container
**principals
;
98 tmp_ctx
= talloc_new(parent_ctx
);
100 *error_string
= "Cannot allocate tmp_ctx";
105 *error_string
= "Cannot have a kerberos secret in secrets.ldb without a realm";
109 upper_realm
= strupper_talloc(tmp_ctx
, realm
);
111 talloc_free(tmp_ctx
);
112 *error_string
= "Cannot allocate full upper case realm";
116 principals
= talloc_array(tmp_ctx
, struct principal_container
*, spn_el
? (spn_el
->num_values
+ 2) : 2);
118 spn_el
= ldb_msg_find_element(msg
, "servicePrincipalName");
119 for (i
=0; spn_el
&& i
< spn_el
->num_values
; i
++) {
120 principals
[i
] = talloc(principals
, struct principal_container
);
121 if (!principals
[i
]) {
122 talloc_free(tmp_ctx
);
123 *error_string
= "Cannot allocate mem_ctx";
127 principals
[i
]->smb_krb5_context
= talloc_reference(principals
[i
], smb_krb5_context
);
128 principals
[i
]->string_form
= talloc_asprintf(principals
[i
], "%*.*s@%s",
129 (int)spn_el
->values
[i
].length
,
130 (int)spn_el
->values
[i
].length
,
131 (const char *)spn_el
->values
[i
].data
, upper_realm
);
132 if (!principals
[i
]->string_form
) {
133 talloc_free(tmp_ctx
);
134 *error_string
= "Cannot allocate full samAccountName";
138 ret
= krb5_parse_name(smb_krb5_context
->krb5_context
,
139 principals
[i
]->string_form
, &principals
[i
]->principal
);
142 talloc_free(tmp_ctx
);
143 (*error_string
) = smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, parent_ctx
);
147 /* This song-and-dance effectivly puts the principal
148 * into talloc, so we can't loose it. */
149 talloc_set_destructor(principals
[i
], free_principal
);
152 if (samAccountName
) {
153 principals
[i
] = talloc(principals
, struct principal_container
);
154 if (!principals
[i
]) {
155 talloc_free(tmp_ctx
);
156 *error_string
= "Cannot allocate mem_ctx";
160 principals
[i
]->smb_krb5_context
= talloc_reference(principals
[i
], smb_krb5_context
);
161 principals
[i
]->string_form
= talloc_asprintf(parent_ctx
, "%s@%s", samAccountName
, upper_realm
);
162 if (!principals
[i
]->string_form
) {
163 talloc_free(tmp_ctx
);
164 *error_string
= "Cannot allocate full samAccountName";
168 ret
= krb5_make_principal(smb_krb5_context
->krb5_context
, &principals
[i
]->principal
, upper_realm
, samAccountName
,
171 talloc_free(tmp_ctx
);
172 (*error_string
) = smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, parent_ctx
);
176 /* This song-and-dance effectively puts the principal
177 * into talloc, so we can't loose it. */
178 talloc_set_destructor(principals
[i
], free_principal
);
182 principals
[i
] = NULL
;
183 *principals_out
= talloc_steal(parent_ctx
, principals
);
185 talloc_free(tmp_ctx
);
189 static krb5_error_code
salt_principal_from_msg(TALLOC_CTX
*parent_ctx
,
190 struct ldb_message
*msg
,
191 struct smb_krb5_context
*smb_krb5_context
,
192 krb5_principal
*salt_princ
,
193 const char **error_string
)
195 const char *salt_principal
= ldb_msg_find_attr_as_string(msg
, "saltPrincipal", NULL
);
196 const char *samAccountName
= ldb_msg_find_attr_as_string(msg
, "samAccountName", NULL
);
197 const char *realm
= ldb_msg_find_attr_as_string(msg
, "realm", NULL
);
198 if (salt_principal
) {
199 return parse_principal(parent_ctx
, salt_principal
, smb_krb5_context
, salt_princ
, error_string
);
200 } else if (samAccountName
) {
202 char *machine_username
;
208 struct principal_container
*mem_ctx
= talloc(parent_ctx
, struct principal_container
);
210 *error_string
= "Cannot allocate mem_ctx";
214 tmp_ctx
= talloc_new(mem_ctx
);
216 talloc_free(mem_ctx
);
217 *error_string
= "Cannot allocate tmp_ctx";
222 *error_string
= "Cannot have a kerberos secret in secrets.ldb without a realm";
226 machine_username
= talloc_strdup(tmp_ctx
, samAccountName
);
227 if (!machine_username
) {
228 talloc_free(mem_ctx
);
229 *error_string
= "Cannot duplicate samAccountName";
233 if (machine_username
[strlen(machine_username
)-1] == '$') {
234 machine_username
[strlen(machine_username
)-1] = '\0';
237 lower_realm
= strlower_talloc(tmp_ctx
, realm
);
239 talloc_free(mem_ctx
);
240 *error_string
= "Cannot allocate to lower case realm";
244 upper_realm
= strupper_talloc(tmp_ctx
, realm
);
246 talloc_free(mem_ctx
);
247 *error_string
= "Cannot allocate to upper case realm";
251 salt_body
= talloc_asprintf(tmp_ctx
, "%s.%s", machine_username
,
253 talloc_free(lower_realm
);
254 talloc_free(machine_username
);
256 talloc_free(mem_ctx
);
257 *error_string
= "Cannot form salt principal body";
261 ret
= krb5_make_principal(smb_krb5_context
->krb5_context
, salt_princ
,
263 "host", salt_body
, NULL
);
265 /* This song-and-dance effectively puts the principal
266 * into talloc, so we can't loose it. */
267 mem_ctx
->smb_krb5_context
= talloc_reference(mem_ctx
, smb_krb5_context
);
268 mem_ctx
->principal
= *salt_princ
;
269 talloc_set_destructor(mem_ctx
, free_principal
);
271 (*error_string
) = smb_get_krb5_error_message(smb_krb5_context
->krb5_context
, ret
, parent_ctx
);
273 talloc_free(tmp_ctx
);
276 (*error_string
) = "Cannot determine salt principal, no saltPrincipal or samAccountName specified";
281 /* Obtain the principal set on this context. Requires a
282 * smb_krb5_context because we are doing krb5 principal parsing with
283 * the library routines. The returned princ is placed in the talloc
284 * system by means of a destructor (do *not* free). */
286 krb5_error_code
principal_from_credentials(TALLOC_CTX
*parent_ctx
,
287 struct cli_credentials
*credentials
,
288 struct smb_krb5_context
*smb_krb5_context
,
289 krb5_principal
*princ
,
290 enum credentials_obtained
*obtained
,
291 const char **error_string
)
294 const char *princ_string
;
295 TALLOC_CTX
*mem_ctx
= talloc_new(parent_ctx
);
297 (*error_string
) = error_message(ENOMEM
);
300 princ_string
= cli_credentials_get_principal_and_obtained(credentials
, mem_ctx
, obtained
);
302 (*error_string
) = error_message(ENOMEM
);
306 ret
= parse_principal(parent_ctx
, princ_string
,
307 smb_krb5_context
, princ
, error_string
);
308 talloc_free(mem_ctx
);
312 /* Obtain the principal set on this context. Requires a
313 * smb_krb5_context because we are doing krb5 principal parsing with
314 * the library routines. The returned princ is placed in the talloc
315 * system by means of a destructor (do *not* free). */
317 krb5_error_code
impersonate_principal_from_credentials(TALLOC_CTX
*parent_ctx
,
318 struct cli_credentials
*credentials
,
319 struct smb_krb5_context
*smb_krb5_context
,
320 krb5_principal
*princ
,
321 const char **error_string
)
323 return parse_principal(parent_ctx
, cli_credentials_get_impersonate_principal(credentials
),
324 smb_krb5_context
, princ
, error_string
);
328 * Return a freshly allocated ccache (destroyed by destructor on child
329 * of parent_ctx), for a given set of client credentials
332 krb5_error_code
kinit_to_ccache(TALLOC_CTX
*parent_ctx
,
333 struct cli_credentials
*credentials
,
334 struct smb_krb5_context
*smb_krb5_context
,
335 struct tevent_context
*event_ctx
,
337 enum credentials_obtained
*obtained
,
338 const char **error_string
)
341 const char *password
;
342 const char *self_service
;
343 const char *target_service
;
345 krb5_principal princ
;
346 krb5_principal impersonate_principal
;
348 TALLOC_CTX
*mem_ctx
= talloc_new(parent_ctx
);
349 krb5_get_init_creds_opt
*krb_options
;
352 (*error_string
) = strerror(ENOMEM
);
356 ret
= principal_from_credentials(mem_ctx
, credentials
, smb_krb5_context
, &princ
, obtained
, error_string
);
358 talloc_free(mem_ctx
);
362 ret
= impersonate_principal_from_credentials(mem_ctx
, credentials
, smb_krb5_context
, &impersonate_principal
, error_string
);
364 talloc_free(mem_ctx
);
368 self_service
= cli_credentials_get_self_service(credentials
);
369 target_service
= cli_credentials_get_target_service(credentials
);
371 password
= cli_credentials_get_password(credentials
);
373 /* setup the krb5 options we want */
374 if ((ret
= krb5_get_init_creds_opt_alloc(smb_krb5_context
->krb5_context
, &krb_options
))) {
375 (*error_string
) = talloc_asprintf(credentials
, "krb5_get_init_creds_opt_alloc failed (%s)\n",
376 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
378 talloc_free(mem_ctx
);
382 /* get the defaults */
383 krb5_get_init_creds_opt_set_default_flags(smb_krb5_context
->krb5_context
, NULL
, NULL
, krb_options
);
385 /* set if we want a forwardable ticket */
386 switch (cli_credentials_get_krb_forwardable(credentials
)) {
387 case CRED_AUTO_KRB_FORWARDABLE
:
389 case CRED_NO_KRB_FORWARDABLE
:
390 krb5_get_init_creds_opt_set_forwardable(krb_options
, FALSE
);
392 case CRED_FORCE_KRB_FORWARDABLE
:
393 krb5_get_init_creds_opt_set_forwardable(krb_options
, TRUE
);
398 * In order to work against windows KDCs even if we use
399 * the netbios domain name as realm, we need to add the following
401 * KRB5_INIT_CREDS_NO_C_CANON_CHECK;
402 * KRB5_INIT_CREDS_NO_C_NO_EKU_CHECK;
404 krb5_get_init_creds_opt_set_win2k(smb_krb5_context
->krb5_context
,
409 struct tevent_context
*previous_ev
;
410 /* Do this every time, in case we have weird recursive issues here */
411 ret
= smb_krb5_context_set_event_ctx(smb_krb5_context
, event_ctx
, &previous_ev
);
413 talloc_free(mem_ctx
);
417 ret
= kerberos_kinit_password_cc(smb_krb5_context
->krb5_context
, ccache
,
419 impersonate_principal
,
424 } else if (impersonate_principal
) {
425 talloc_free(mem_ctx
);
426 (*error_string
) = "INTERNAL error: Cannot impersonate principal with just a keyblock. A password must be specified in the credentials";
429 /* No password available, try to use a keyblock instead */
431 krb5_keyblock keyblock
;
432 const struct samr_Password
*mach_pwd
;
433 mach_pwd
= cli_credentials_get_nt_hash(credentials
, mem_ctx
);
435 talloc_free(mem_ctx
);
436 (*error_string
) = "kinit_to_ccache: No password available for kinit\n";
437 krb5_get_init_creds_opt_free(smb_krb5_context
->krb5_context
, krb_options
);
438 smb_krb5_context_remove_event_ctx(smb_krb5_context
, previous_ev
, event_ctx
);
441 ret
= krb5_keyblock_init(smb_krb5_context
->krb5_context
,
442 ENCTYPE_ARCFOUR_HMAC
,
443 mach_pwd
->hash
, sizeof(mach_pwd
->hash
),
447 ret
= kerberos_kinit_keyblock_cc(smb_krb5_context
->krb5_context
, ccache
,
449 target_service
, krb_options
,
451 krb5_free_keyblock_contents(smb_krb5_context
->krb5_context
, &keyblock
);
455 smb_krb5_context_remove_event_ctx(smb_krb5_context
, previous_ev
, event_ctx
);
457 if (ret
== KRB5KRB_AP_ERR_SKEW
|| ret
== KRB5_KDCREP_SKEW
) {
458 /* Perhaps we have been given an invalid skew, so try again without it */
459 time_t t
= time(NULL
);
460 krb5_set_real_time(smb_krb5_context
->krb5_context
, t
, 0);
462 /* not a skew problem */
467 krb5_get_init_creds_opt_free(smb_krb5_context
->krb5_context
, krb_options
);
469 if (ret
== KRB5KRB_AP_ERR_SKEW
|| ret
== KRB5_KDCREP_SKEW
) {
470 (*error_string
) = talloc_asprintf(credentials
, "kinit for %s failed (%s)\n",
471 cli_credentials_get_principal(credentials
, mem_ctx
),
472 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
474 talloc_free(mem_ctx
);
478 /* cope with ticket being in the future due to clock skew */
479 if ((unsigned)kdc_time
> time(NULL
)) {
480 time_t t
= time(NULL
);
481 int time_offset
=(unsigned)kdc_time
-t
;
482 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset
));
483 krb5_set_real_time(smb_krb5_context
->krb5_context
, t
+ time_offset
+ 1, 0);
486 if (ret
== KRB5KDC_ERR_PREAUTH_FAILED
&& cli_credentials_wrong_password(credentials
)) {
487 ret
= kinit_to_ccache(parent_ctx
,
496 (*error_string
) = talloc_asprintf(credentials
, "kinit for %s failed (%s)\n",
497 cli_credentials_get_principal(credentials
, mem_ctx
),
498 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
500 talloc_free(mem_ctx
);
503 talloc_free(mem_ctx
);
507 static krb5_error_code
free_keytab_container(struct keytab_container
*ktc
)
509 return krb5_kt_close(ktc
->smb_krb5_context
->krb5_context
, ktc
->keytab
);
512 krb5_error_code
smb_krb5_get_keytab_container(TALLOC_CTX
*mem_ctx
,
513 struct smb_krb5_context
*smb_krb5_context
,
514 const char *keytab_name
, struct keytab_container
**ktc
)
518 ret
= krb5_kt_resolve(smb_krb5_context
->krb5_context
, keytab_name
, &keytab
);
520 DEBUG(1,("failed to open krb5 keytab: %s\n",
521 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
526 *ktc
= talloc(mem_ctx
, struct keytab_container
);
531 (*ktc
)->smb_krb5_context
= talloc_reference(*ktc
, smb_krb5_context
);
532 (*ktc
)->keytab
= keytab
;
533 talloc_set_destructor(*ktc
, free_keytab_container
);
538 static krb5_error_code
keytab_add_keys(TALLOC_CTX
*parent_ctx
,
539 struct principal_container
**principals
,
540 krb5_principal salt_princ
,
542 const char *password_s
,
543 struct smb_krb5_context
*smb_krb5_context
,
544 krb5_enctype
*enctypes
,
546 const char **error_string
)
552 password
.data
= discard_const_p(char *, password_s
);
553 password
.length
= strlen(password_s
);
555 for (i
=0; enctypes
[i
]; i
++) {
556 krb5_keytab_entry entry
;
560 ret
= create_kerberos_key_from_string_direct(smb_krb5_context
->krb5_context
,
561 salt_princ
, &password
, &entry
.keyblock
, enctypes
[i
]);
568 for (p
=0; principals
[p
]; p
++) {
569 entry
.principal
= principals
[p
]->principal
;
570 ret
= krb5_kt_add_entry(smb_krb5_context
->krb5_context
, keytab
, &entry
);
572 char *k5_error_string
= smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
574 *error_string
= talloc_asprintf(parent_ctx
, "Failed to add enctype %d entry for %s(kvno %d) to keytab: %s\n",
576 principals
[p
]->string_form
,
579 talloc_free(k5_error_string
);
580 krb5_free_keyblock_contents(smb_krb5_context
->krb5_context
, &entry
.keyblock
);
584 DEBUG(5, ("Added %s(kvno %d) to keytab (enctype %d)\n",
585 principals
[p
]->string_form
, kvno
,
588 krb5_free_keyblock_contents(smb_krb5_context
->krb5_context
, &entry
.keyblock
);
593 static krb5_error_code
create_keytab(TALLOC_CTX
*parent_ctx
,
594 struct ldb_message
*msg
,
595 struct principal_container
**principals
,
596 struct smb_krb5_context
*smb_krb5_context
,
599 const char **error_string
)
602 const char *password_s
;
603 const char *old_secret
;
605 uint32_t enctype_bitmap
;
606 krb5_principal salt_princ
;
607 krb5_enctype
*enctypes
;
608 TALLOC_CTX
*mem_ctx
= talloc_new(parent_ctx
);
610 *error_string
= "unable to allocate tmp_ctx for create_keytab";
614 /* The salt used to generate these entries may be different however, fetch that */
615 ret
= salt_principal_from_msg(mem_ctx
, msg
,
617 &salt_princ
, error_string
);
619 talloc_free(mem_ctx
);
623 kvno
= ldb_msg_find_attr_as_int(msg
, "msDS-KeyVersionNumber", 0);
625 /* Finally, do the dance to get the password to put in the entry */
626 password_s
= ldb_msg_find_attr_as_string(msg
, "secret", NULL
);
629 /* There is no password here, so nothing to do */
630 talloc_free(mem_ctx
);
634 if (add_old
&& kvno
!= 0) {
635 old_secret
= ldb_msg_find_attr_as_string(msg
, "priorSecret", NULL
);
640 enctype_bitmap
= (uint32_t)ldb_msg_find_attr_as_int(msg
, "msDS-SupportedEncryptionTypes", ENC_ALL_TYPES
);
642 ret
= kerberos_enctype_bitmap_to_enctypes(mem_ctx
, enctype_bitmap
, &enctypes
);
644 *error_string
= talloc_asprintf(parent_ctx
, "create_keytab: generating list of encryption types failed (%s)\n",
645 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
647 talloc_free(mem_ctx
);
651 ret
= keytab_add_keys(mem_ctx
, principals
,
653 kvno
, password_s
, smb_krb5_context
,
654 enctypes
, keytab
, error_string
);
656 talloc_free(mem_ctx
);
661 ret
= keytab_add_keys(mem_ctx
, principals
,
663 kvno
- 1, old_secret
, smb_krb5_context
,
664 enctypes
, keytab
, error_string
);
666 talloc_free(mem_ctx
);
671 talloc_free(mem_ctx
);
676 * Walk the keytab, looking for entries of this principal name, with KVNO other than current kvno -1.
678 * These entries are now stale, we only keep the current, and previous entries around.
680 * Inspired by the code in Samba3 for 'use kerberos keytab'.
684 static krb5_error_code
remove_old_entries(TALLOC_CTX
*parent_ctx
,
685 struct ldb_message
*msg
,
686 struct principal_container
**principals
,
687 bool delete_all_kvno
,
688 struct smb_krb5_context
*smb_krb5_context
,
689 krb5_keytab keytab
, bool *found_previous
,
690 const char **error_string
)
692 krb5_error_code ret
, ret2
;
693 krb5_kt_cursor cursor
;
695 TALLOC_CTX
*mem_ctx
= talloc_new(parent_ctx
);
701 *found_previous
= false;
703 kvno
= ldb_msg_find_attr_as_int(msg
, "msDS-KeyVersionNumber", 0);
705 /* for each entry in the keytab */
706 ret
= krb5_kt_start_seq_get(smb_krb5_context
->krb5_context
, keytab
, &cursor
);
710 case HEIM_ERR_OPNOTSUPP
:
713 /* no point enumerating if there isn't anything here */
714 talloc_free(mem_ctx
);
717 *error_string
= talloc_asprintf(parent_ctx
, "failed to open keytab for read of old entries: %s\n",
718 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
720 talloc_free(mem_ctx
);
726 bool matched
= false;
727 krb5_keytab_entry entry
;
728 ret
= krb5_kt_next_entry(smb_krb5_context
->krb5_context
, keytab
, &entry
, &cursor
);
732 for (i
= 0; principals
[i
]; i
++) {
733 /* if it matches our principal */
734 if (krb5_kt_compare(smb_krb5_context
->krb5_context
, &entry
, principals
[i
]->principal
, 0, 0)) {
741 /* Free the entry, it wasn't the one we were looking for anyway */
742 krb5_kt_free_entry(smb_krb5_context
->krb5_context
, &entry
);
746 /* delete it, if it is not kvno -1 */
747 if (entry
.vno
!= (kvno
- 1 )) {
748 /* Release the enumeration. We are going to
749 * have to start this from the top again,
750 * because deletes during enumeration may not
751 * always be consistent.
753 * Also, the enumeration locks a FILE: keytab
756 krb5_kt_end_seq_get(smb_krb5_context
->krb5_context
, keytab
, &cursor
);
758 ret
= krb5_kt_remove_entry(smb_krb5_context
->krb5_context
, keytab
, &entry
);
759 krb5_kt_free_entry(smb_krb5_context
->krb5_context
, &entry
);
761 /* Deleted: Restart from the top */
762 ret2
= krb5_kt_start_seq_get(smb_krb5_context
->krb5_context
, keytab
, &cursor
);
764 krb5_kt_free_entry(smb_krb5_context
->krb5_context
, &entry
);
765 DEBUG(1,("failed to restart enumeration of keytab: %s\n",
766 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
769 talloc_free(mem_ctx
);
778 *found_previous
= true;
781 /* Free the entry, we don't need it any more */
782 krb5_kt_free_entry(smb_krb5_context
->krb5_context
, &entry
);
786 krb5_kt_end_seq_get(smb_krb5_context
->krb5_context
, keytab
, &cursor
);
796 *error_string
= talloc_asprintf(parent_ctx
, "failed in deleting old entries for principal: %s\n",
797 smb_get_krb5_error_message(smb_krb5_context
->krb5_context
,
800 talloc_free(mem_ctx
);
804 krb5_error_code
smb_krb5_update_keytab(TALLOC_CTX
*parent_ctx
,
805 struct smb_krb5_context
*smb_krb5_context
,
806 struct ldb_context
*ldb
,
807 struct ldb_message
*msg
,
808 bool delete_all_kvno
,
809 const char **error_string
)
813 TALLOC_CTX
*mem_ctx
= talloc_new(NULL
);
814 struct keytab_container
*keytab_container
;
815 struct principal_container
**principals
;
816 const char *keytab_name
;
822 keytab_name
= keytab_name_from_msg(mem_ctx
, ldb
, msg
);
827 ret
= smb_krb5_get_keytab_container(mem_ctx
, smb_krb5_context
, keytab_name
, &keytab_container
);
830 talloc_free(mem_ctx
);
834 DEBUG(5, ("Opened keytab %s\n", keytab_name
));
836 /* Get the principal we will store the new keytab entries under */
837 ret
= principals_from_msg(mem_ctx
, msg
, smb_krb5_context
, &principals
, error_string
);
840 *error_string
= talloc_asprintf(parent_ctx
, "Failed to load principals from ldb message: %s\n", *error_string
);
841 talloc_free(mem_ctx
);
845 ret
= remove_old_entries(mem_ctx
, msg
, principals
, delete_all_kvno
,
846 smb_krb5_context
, keytab_container
->keytab
, &found_previous
, error_string
);
848 *error_string
= talloc_asprintf(parent_ctx
, "Failed to remove old principals from keytab: %s\n", *error_string
);
849 talloc_free(mem_ctx
);
853 if (!delete_all_kvno
) {
854 /* Create a new keytab. If during the cleanout we found
855 * entires for kvno -1, then don't try and duplicate them.
856 * Otherwise, add kvno, and kvno -1 */
858 ret
= create_keytab(mem_ctx
, msg
, principals
,
860 keytab_container
->keytab
,
861 found_previous
? false : true, error_string
);
863 talloc_free(mem_ctx
);
867 krb5_error_code
smb_krb5_create_memory_keytab(TALLOC_CTX
*parent_ctx
,
868 struct cli_credentials
*machine_account
,
869 struct smb_krb5_context
*smb_krb5_context
,
870 struct keytab_container
**keytab_container
)
873 TALLOC_CTX
*mem_ctx
= talloc_new(parent_ctx
);
874 const char *rand_string
;
875 const char *keytab_name
;
876 struct ldb_message
*msg
;
877 const char *error_string
;
882 *keytab_container
= talloc(mem_ctx
, struct keytab_container
);
884 rand_string
= generate_random_str(mem_ctx
, 16);
886 talloc_free(mem_ctx
);
890 keytab_name
= talloc_asprintf(mem_ctx
, "MEMORY:%s",
893 talloc_free(mem_ctx
);
897 ret
= smb_krb5_get_keytab_container(mem_ctx
, smb_krb5_context
, keytab_name
, keytab_container
);
902 msg
= ldb_msg_new(mem_ctx
);
904 talloc_free(mem_ctx
);
907 ldb_msg_add_string(msg
, "krb5Keytab", keytab_name
);
908 ldb_msg_add_string(msg
, "secret", cli_credentials_get_password(machine_account
));
909 ldb_msg_add_string(msg
, "samAccountName", cli_credentials_get_username(machine_account
));
910 ldb_msg_add_string(msg
, "realm", cli_credentials_get_realm(machine_account
));
911 ldb_msg_add_fmt(msg
, "msDS-KeyVersionNumber", "%d", (int)cli_credentials_get_kvno(machine_account
));
913 ret
= smb_krb5_update_keytab(mem_ctx
, smb_krb5_context
, NULL
, msg
, false, &error_string
);
915 talloc_steal(parent_ctx
, *keytab_container
);
917 DEBUG(0, ("Failed to create in-memory keytab: %s\n", error_string
));
918 *keytab_container
= NULL
;
920 talloc_free(mem_ctx
);
923 /* Translate between the IETF encryption type values and the Microsoft msDS-SupportedEncryptionTypes values */
924 uint32_t kerberos_enctype_to_bitmap(krb5_enctype enc_type_enum
)
926 switch (enc_type_enum
) {
927 case ENCTYPE_DES_CBC_CRC
:
929 case ENCTYPE_DES_CBC_MD5
:
931 case ENCTYPE_ARCFOUR_HMAC_MD5
:
932 return ENC_RC4_HMAC_MD5
;
933 case ENCTYPE_AES128_CTS_HMAC_SHA1_96
:
934 return ENC_HMAC_SHA1_96_AES128
;
935 case ENCTYPE_AES256_CTS_HMAC_SHA1_96
:
936 return ENC_HMAC_SHA1_96_AES256
;
942 /* Translate between the Microsoft msDS-SupportedEncryptionTypes values and the IETF encryption type values */
943 krb5_enctype
kerberos_enctype_bitmap_to_enctype(uint32_t enctype_bitmap
)
945 switch (enctype_bitmap
) {
947 return ENCTYPE_DES_CBC_CRC
;
949 return ENCTYPE_DES_CBC_MD5
;
950 case ENC_RC4_HMAC_MD5
:
951 return ENCTYPE_ARCFOUR_HMAC_MD5
;
952 case ENC_HMAC_SHA1_96_AES128
:
953 return ENCTYPE_AES128_CTS_HMAC_SHA1_96
;
954 case ENC_HMAC_SHA1_96_AES256
:
955 return ENCTYPE_AES256_CTS_HMAC_SHA1_96
;
961 /* Return an array of krb5_enctype values */
962 krb5_error_code
kerberos_enctype_bitmap_to_enctypes(TALLOC_CTX
*mem_ctx
, uint32_t enctype_bitmap
, krb5_enctype
**enctypes
)
964 unsigned int i
, j
= 0;
965 *enctypes
= talloc_zero_array(mem_ctx
, krb5_enctype
, (8*sizeof(enctype_bitmap
))+1);
969 for (i
=0; i
<(8*sizeof(enctype_bitmap
)); i
++) {
970 uint32_t bit_value
= (1 << i
) & enctype_bitmap
;
971 if (bit_value
& enctype_bitmap
) {
972 (*enctypes
)[j
] = kerberos_enctype_bitmap_to_enctype(bit_value
);
973 if (!(*enctypes
)[j
]) {