2 * Copyright (c) 1997-2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * return the realm of a krbtgt-ticket or NULL
41 get_krbtgt_realm(const PrincipalName
*p
)
43 if(p
->name_string
.len
== 2
44 && strcmp(p
->name_string
.val
[0], KRB5_TGS_NAME
) == 0)
45 return p
->name_string
.val
[1];
51 * The KDC might add a signed path to the ticket authorization data
52 * field. This is to avoid server impersonating clients and the
53 * request constrained delegation.
55 * This is done by storing a KRB5_AUTHDATA_IF_RELEVANT with a single
56 * entry of type KRB5SignedPath.
59 static krb5_error_code
60 find_KRB5SignedPath(krb5_context context
,
61 const AuthorizationData
*ad
,
64 AuthorizationData child
;
68 if (ad
== NULL
|| ad
->len
== 0)
69 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
73 if (ad
->val
[pos
].ad_type
!= KRB5_AUTHDATA_IF_RELEVANT
)
74 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
76 ret
= decode_AuthorizationData(ad
->val
[pos
].ad_data
.data
,
77 ad
->val
[pos
].ad_data
.length
,
81 krb5_set_error_message(context
, ret
, "Failed to decode "
82 "IF_RELEVANT with %d", ret
);
87 free_AuthorizationData(&child
);
88 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
91 if (child
.val
[0].ad_type
!= KRB5_AUTHDATA_SIGNTICKET
) {
92 free_AuthorizationData(&child
);
93 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
97 ret
= der_copy_octet_string(&child
.val
[0].ad_data
, data
);
98 free_AuthorizationData(&child
);
103 _kdc_add_KRB5SignedPath(krb5_context context
,
104 krb5_kdc_configuration
*config
,
105 hdb_entry_ex
*krbtgt
,
106 krb5_enctype enctype
,
107 krb5_principal client
,
108 krb5_const_principal server
,
109 krb5_principals principals
,
115 krb5_crypto crypto
= NULL
;
118 if (server
&& principals
) {
119 ret
= add_Principals(principals
, server
);
125 KRB5SignedPathData spd
;
128 spd
.authtime
= tkt
->authtime
;
129 spd
.delegated
= principals
;
130 spd
.method_data
= NULL
;
132 ASN1_MALLOC_ENCODE(KRB5SignedPathData
, data
.data
, data
.length
,
136 if (data
.length
!= size
)
137 krb5_abortx(context
, "internal asn.1 encoder error");
142 ret
= hdb_enctype2key(context
, &krbtgt
->entry
, enctype
, &key
);
144 ret
= krb5_crypto_init(context
, &key
->key
, 0, &crypto
);
152 * Fill in KRB5SignedPath
156 sp
.delegated
= principals
;
157 sp
.method_data
= NULL
;
159 ret
= krb5_create_checksum(context
, crypto
, KRB5_KU_KRB5SIGNEDPATH
, 0,
160 data
.data
, data
.length
, &sp
.cksum
);
161 krb5_crypto_destroy(context
, crypto
);
166 ASN1_MALLOC_ENCODE(KRB5SignedPath
, data
.data
, data
.length
, &sp
, &size
, ret
);
167 free_Checksum(&sp
.cksum
);
170 if (data
.length
!= size
)
171 krb5_abortx(context
, "internal asn.1 encoder error");
175 * Add IF-RELEVANT(KRB5SignedPath) to the last slot in
176 * authorization data field.
179 ret
= _kdc_tkt_add_if_relevant_ad(context
, tkt
,
180 KRB5_AUTHDATA_SIGNTICKET
, &data
);
181 krb5_data_free(&data
);
186 static krb5_error_code
187 check_KRB5SignedPath(krb5_context context
,
188 krb5_kdc_configuration
*config
,
189 hdb_entry_ex
*krbtgt
,
192 krb5_principals
*delegated
,
197 krb5_crypto crypto
= NULL
;
202 ret
= find_KRB5SignedPath(context
, tkt
->authorization_data
, &data
);
204 KRB5SignedPathData spd
;
208 ret
= decode_KRB5SignedPath(data
.data
, data
.length
, &sp
, NULL
);
209 krb5_data_free(&data
);
214 spd
.authtime
= tkt
->authtime
;
215 spd
.delegated
= sp
.delegated
;
216 spd
.method_data
= sp
.method_data
;
218 ASN1_MALLOC_ENCODE(KRB5SignedPathData
, data
.data
, data
.length
,
221 free_KRB5SignedPath(&sp
);
224 if (data
.length
!= size
)
225 krb5_abortx(context
, "internal asn.1 encoder error");
229 ret
= hdb_enctype2key(context
, &krbtgt
->entry
, sp
.etype
, &key
);
231 ret
= krb5_crypto_init(context
, &key
->key
, 0, &crypto
);
234 free_KRB5SignedPath(&sp
);
238 ret
= krb5_verify_checksum(context
, crypto
, KRB5_KU_KRB5SIGNEDPATH
,
239 data
.data
, data
.length
,
241 krb5_crypto_destroy(context
, crypto
);
244 free_KRB5SignedPath(&sp
);
245 kdc_log(context
, config
, 5,
246 "KRB5SignedPath not signed correctly, not marking as signed");
250 if (delegated
&& sp
.delegated
) {
252 *delegated
= malloc(sizeof(*sp
.delegated
));
253 if (*delegated
== NULL
) {
254 free_KRB5SignedPath(&sp
);
258 ret
= copy_Principals(*delegated
, sp
.delegated
);
260 free_KRB5SignedPath(&sp
);
266 free_KRB5SignedPath(&sp
);
278 static krb5_error_code
279 check_PAC(krb5_context context
,
280 krb5_kdc_configuration
*config
,
281 const krb5_principal client_principal
,
282 const krb5_principal delegated_proxy_principal
,
283 hdb_entry_ex
*client
,
284 hdb_entry_ex
*server
,
285 hdb_entry_ex
*krbtgt
,
286 const EncryptionKey
*server_check_key
,
287 const EncryptionKey
*server_sign_key
,
288 const EncryptionKey
*krbtgt_sign_key
,
293 AuthorizationData
*ad
= tkt
->authorization_data
;
297 if (ad
== NULL
|| ad
->len
== 0)
300 for (i
= 0; i
< ad
->len
; i
++) {
301 AuthorizationData child
;
303 if (ad
->val
[i
].ad_type
!= KRB5_AUTHDATA_IF_RELEVANT
)
306 ret
= decode_AuthorizationData(ad
->val
[i
].ad_data
.data
,
307 ad
->val
[i
].ad_data
.length
,
311 krb5_set_error_message(context
, ret
, "Failed to decode "
312 "IF_RELEVANT with %d", ret
);
315 for (j
= 0; j
< child
.len
; j
++) {
317 if (child
.val
[j
].ad_type
== KRB5_AUTHDATA_WIN2K_PAC
) {
322 ret
= krb5_pac_parse(context
,
323 child
.val
[j
].ad_data
.data
,
324 child
.val
[j
].ad_data
.length
,
326 free_AuthorizationData(&child
);
330 ret
= krb5_pac_verify(context
, pac
, tkt
->authtime
,
332 server_check_key
, NULL
);
334 krb5_pac_free(context
, pac
);
338 ret
= _kdc_pac_verify(context
, client_principal
,
339 delegated_proxy_principal
,
340 client
, server
, krbtgt
, &pac
, &signed_pac
);
342 krb5_pac_free(context
, pac
);
347 * Only re-sign PAC if we could verify it with the PAC
348 * function. The no-verify case happens when we get in
349 * a PAC from cross realm from a Windows domain and
350 * that there is no PAC verification function.
354 ret
= _krb5_pac_sign(context
, pac
, tkt
->authtime
,
356 server_sign_key
, krbtgt_sign_key
, rspac
);
358 krb5_pac_free(context
, pac
);
363 free_AuthorizationData(&child
);
372 static krb5_error_code
373 check_tgs_flags(krb5_context context
,
374 krb5_kdc_configuration
*config
,
375 KDC_REQ_BODY
*b
, const EncTicketPart
*tgt
, EncTicketPart
*et
)
377 KDCOptions f
= b
->kdc_options
;
380 if(!tgt
->flags
.invalid
|| tgt
->starttime
== NULL
){
381 kdc_log(context
, config
, 0,
382 "Bad request to validate ticket");
383 return KRB5KDC_ERR_BADOPTION
;
385 if(*tgt
->starttime
> kdc_time
){
386 kdc_log(context
, config
, 0,
387 "Early request to validate ticket");
388 return KRB5KRB_AP_ERR_TKT_NYV
;
391 et
->flags
.invalid
= 0;
392 }else if(tgt
->flags
.invalid
){
393 kdc_log(context
, config
, 0,
394 "Ticket-granting ticket has INVALID flag set");
395 return KRB5KRB_AP_ERR_TKT_INVALID
;
399 if(!tgt
->flags
.forwardable
){
400 kdc_log(context
, config
, 0,
401 "Bad request for forwardable ticket");
402 return KRB5KDC_ERR_BADOPTION
;
404 et
->flags
.forwardable
= 1;
407 if(!tgt
->flags
.forwardable
){
408 kdc_log(context
, config
, 0,
409 "Request to forward non-forwardable ticket");
410 return KRB5KDC_ERR_BADOPTION
;
412 et
->flags
.forwarded
= 1;
413 et
->caddr
= b
->addresses
;
415 if(tgt
->flags
.forwarded
)
416 et
->flags
.forwarded
= 1;
419 if(!tgt
->flags
.proxiable
){
420 kdc_log(context
, config
, 0,
421 "Bad request for proxiable ticket");
422 return KRB5KDC_ERR_BADOPTION
;
424 et
->flags
.proxiable
= 1;
427 if(!tgt
->flags
.proxiable
){
428 kdc_log(context
, config
, 0,
429 "Request to proxy non-proxiable ticket");
430 return KRB5KDC_ERR_BADOPTION
;
433 et
->caddr
= b
->addresses
;
438 if(f
.allow_postdate
){
439 if(!tgt
->flags
.may_postdate
){
440 kdc_log(context
, config
, 0,
441 "Bad request for post-datable ticket");
442 return KRB5KDC_ERR_BADOPTION
;
444 et
->flags
.may_postdate
= 1;
447 if(!tgt
->flags
.may_postdate
){
448 kdc_log(context
, config
, 0,
449 "Bad request for postdated ticket");
450 return KRB5KDC_ERR_BADOPTION
;
453 *et
->starttime
= *b
->from
;
454 et
->flags
.postdated
= 1;
455 et
->flags
.invalid
= 1;
456 }else if(b
->from
&& *b
->from
> kdc_time
+ context
->max_skew
){
457 kdc_log(context
, config
, 0, "Ticket cannot be postdated");
458 return KRB5KDC_ERR_CANNOT_POSTDATE
;
462 if(!tgt
->flags
.renewable
|| tgt
->renew_till
== NULL
){
463 kdc_log(context
, config
, 0,
464 "Bad request for renewable ticket");
465 return KRB5KDC_ERR_BADOPTION
;
467 et
->flags
.renewable
= 1;
468 ALLOC(et
->renew_till
);
469 _kdc_fix_time(&b
->rtime
);
470 *et
->renew_till
= *b
->rtime
;
474 if(!tgt
->flags
.renewable
|| tgt
->renew_till
== NULL
){
475 kdc_log(context
, config
, 0,
476 "Request to renew non-renewable ticket");
477 return KRB5KDC_ERR_BADOPTION
;
479 old_life
= tgt
->endtime
;
481 old_life
-= *tgt
->starttime
;
483 old_life
-= tgt
->authtime
;
484 et
->endtime
= *et
->starttime
+ old_life
;
485 if (et
->renew_till
!= NULL
)
486 et
->endtime
= min(*et
->renew_till
, et
->endtime
);
490 /* checks for excess flags */
491 if(f
.request_anonymous
&& !config
->allow_anonymous
){
492 kdc_log(context
, config
, 0,
493 "Request for anonymous ticket");
494 return KRB5KDC_ERR_BADOPTION
;
501 * Determine if constrained delegation is allowed from this client to this server
504 static krb5_error_code
505 check_constrained_delegation(krb5_context context
,
506 krb5_kdc_configuration
*config
,
508 hdb_entry_ex
*client
,
509 hdb_entry_ex
*server
,
510 krb5_const_principal target
)
512 const HDB_Ext_Constrained_delegation_acl
*acl
;
517 * constrained_delegation (S4U2Proxy) only works within
518 * the same realm. We use the already canonicalized version
519 * of the principals here, while "target" is the principal
520 * provided by the client.
522 if(!krb5_realm_compare(context
, client
->entry
.principal
, server
->entry
.principal
)) {
523 ret
= KRB5KDC_ERR_BADOPTION
;
524 kdc_log(context
, config
, 0,
525 "Bad request for constrained delegation");
529 if (clientdb
->hdb_check_constrained_delegation
) {
530 ret
= clientdb
->hdb_check_constrained_delegation(context
, clientdb
, client
, target
);
534 /* if client delegates to itself, that ok */
535 if (krb5_principal_compare(context
, client
->entry
.principal
, server
->entry
.principal
) == TRUE
)
538 ret
= hdb_entry_get_ConstrainedDelegACL(&client
->entry
, &acl
);
540 krb5_clear_error_message(context
);
545 for (i
= 0; i
< acl
->len
; i
++) {
546 if (krb5_principal_compare(context
, target
, &acl
->val
[i
]) == TRUE
)
550 ret
= KRB5KDC_ERR_BADOPTION
;
552 kdc_log(context
, config
, 0,
553 "Bad request for constrained delegation");
558 * Determine if s4u2self is allowed from this client to this server
560 * For example, regardless of the principal being impersonated, if the
561 * 'client' and 'server' are the same, then it's safe.
564 static krb5_error_code
565 check_s4u2self(krb5_context context
,
566 krb5_kdc_configuration
*config
,
568 hdb_entry_ex
*client
,
569 krb5_const_principal server
)
573 /* if client does a s4u2self to itself, that ok */
574 if (krb5_principal_compare(context
, client
->entry
.principal
, server
) == TRUE
)
577 if (clientdb
->hdb_check_s4u2self
) {
578 ret
= clientdb
->hdb_check_s4u2self(context
, clientdb
, client
, server
);
582 ret
= KRB5KDC_ERR_BADOPTION
;
591 static krb5_error_code
592 verify_flags (krb5_context context
,
593 krb5_kdc_configuration
*config
,
594 const EncTicketPart
*et
,
597 if(et
->endtime
< kdc_time
){
598 kdc_log(context
, config
, 0, "Ticket expired (%s)", pstr
);
599 return KRB5KRB_AP_ERR_TKT_EXPIRED
;
601 if(et
->flags
.invalid
){
602 kdc_log(context
, config
, 0, "Ticket not valid (%s)", pstr
);
603 return KRB5KRB_AP_ERR_TKT_NYV
;
612 static krb5_error_code
613 fix_transited_encoding(krb5_context context
,
614 krb5_kdc_configuration
*config
,
615 krb5_boolean check_policy
,
616 const TransitedEncoding
*tr
,
618 const char *client_realm
,
619 const char *server_realm
,
620 const char *tgt_realm
)
622 krb5_error_code ret
= 0;
623 char **realms
, **tmp
;
624 unsigned int num_realms
;
627 switch (tr
->tr_type
) {
628 case DOMAIN_X500_COMPRESS
:
632 * Allow empty content of type 0 because that is was Microsoft
633 * generates in their TGT.
635 if (tr
->contents
.length
== 0)
637 kdc_log(context
, config
, 0,
638 "Transited type 0 with non empty content");
639 return KRB5KDC_ERR_TRTYPE_NOSUPP
;
641 kdc_log(context
, config
, 0,
642 "Unknown transited type: %u", tr
->tr_type
);
643 return KRB5KDC_ERR_TRTYPE_NOSUPP
;
646 ret
= krb5_domain_x500_decode(context
,
653 krb5_warn(context
, ret
,
654 "Decoding transited encoding");
657 if(strcmp(client_realm
, tgt_realm
) && strcmp(server_realm
, tgt_realm
)) {
658 /* not us, so add the previous realm to transited set */
659 if (num_realms
+ 1 > UINT_MAX
/sizeof(*realms
)) {
663 tmp
= realloc(realms
, (num_realms
+ 1) * sizeof(*realms
));
669 realms
[num_realms
] = strdup(tgt_realm
);
670 if(realms
[num_realms
] == NULL
){
676 if(num_realms
== 0) {
677 if(strcmp(client_realm
, server_realm
))
678 kdc_log(context
, config
, 0,
679 "cross-realm %s -> %s", client_realm
, server_realm
);
683 for(i
= 0; i
< num_realms
; i
++)
684 l
+= strlen(realms
[i
]) + 2;
688 for(i
= 0; i
< num_realms
; i
++) {
690 strlcat(rs
, ", ", l
);
691 strlcat(rs
, realms
[i
], l
);
693 kdc_log(context
, config
, 0,
694 "cross-realm %s -> %s via [%s]",
695 client_realm
, server_realm
, rs
);
700 ret
= krb5_check_transited(context
, client_realm
,
702 realms
, num_realms
, NULL
);
704 krb5_warn(context
, ret
, "cross-realm %s -> %s",
705 client_realm
, server_realm
);
708 et
->flags
.transited_policy_checked
= 1;
710 et
->transited
.tr_type
= DOMAIN_X500_COMPRESS
;
711 ret
= krb5_domain_x500_encode(realms
, num_realms
, &et
->transited
.contents
);
713 krb5_warn(context
, ret
, "Encoding transited encoding");
715 for(i
= 0; i
< num_realms
; i
++)
722 static krb5_error_code
723 tgs_make_reply(krb5_context context
,
724 krb5_kdc_configuration
*config
,
726 krb5_const_principal tgt_name
,
727 const EncTicketPart
*tgt
,
728 const krb5_keyblock
*replykey
,
730 const EncryptionKey
*serverkey
,
731 const krb5_keyblock
*sessionkey
,
733 AuthorizationData
*auth_data
,
734 hdb_entry_ex
*server
,
735 krb5_principal server_principal
,
736 const char *server_name
,
737 hdb_entry_ex
*client
,
738 krb5_principal client_principal
,
739 hdb_entry_ex
*krbtgt
,
740 krb5_enctype krbtgt_etype
,
742 const krb5_data
*rspac
,
743 const METHOD_DATA
*enc_pa_data
,
750 KDCOptions f
= b
->kdc_options
;
754 memset(&rep
, 0, sizeof(rep
));
755 memset(&et
, 0, sizeof(et
));
756 memset(&ek
, 0, sizeof(ek
));
759 rep
.msg_type
= krb_tgs_rep
;
761 et
.authtime
= tgt
->authtime
;
762 _kdc_fix_time(&b
->till
);
763 et
.endtime
= min(tgt
->endtime
, *b
->till
);
765 *et
.starttime
= kdc_time
;
767 ret
= check_tgs_flags(context
, config
, b
, tgt
, &et
);
771 /* We should check the transited encoding if:
772 1) the request doesn't ask not to be checked
773 2) globally enforcing a check
774 3) principal requires checking
775 4) we allow non-check per-principal, but principal isn't marked as allowing this
776 5) we don't globally allow this
779 #define GLOBAL_FORCE_TRANSITED_CHECK \
780 (config->trpolicy == TRPOLICY_ALWAYS_CHECK)
781 #define GLOBAL_ALLOW_PER_PRINCIPAL \
782 (config->trpolicy == TRPOLICY_ALLOW_PER_PRINCIPAL)
783 #define GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK \
784 (config->trpolicy == TRPOLICY_ALWAYS_HONOUR_REQUEST)
786 /* these will consult the database in future release */
787 #define PRINCIPAL_FORCE_TRANSITED_CHECK(P) 0
788 #define PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(P) 0
790 ret
= fix_transited_encoding(context
, config
,
791 !f
.disable_transited_check
||
792 GLOBAL_FORCE_TRANSITED_CHECK
||
793 PRINCIPAL_FORCE_TRANSITED_CHECK(server
) ||
794 !((GLOBAL_ALLOW_PER_PRINCIPAL
&&
795 PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(server
)) ||
796 GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK
),
797 &tgt
->transited
, &et
,
798 krb5_principal_get_realm(context
, client_principal
),
799 krb5_principal_get_realm(context
, server
->entry
.principal
),
800 krb5_principal_get_realm(context
, krbtgt
->entry
.principal
));
804 copy_Realm(&server_principal
->realm
, &rep
.ticket
.realm
);
805 _krb5_principal2principalname(&rep
.ticket
.sname
, server_principal
);
806 copy_Realm(&tgt_name
->realm
, &rep
.crealm
);
808 if (f.request_anonymous)
809 _kdc_make_anonymous_principalname (&rep.cname);
812 copy_PrincipalName(&tgt_name
->name
, &rep
.cname
);
813 rep
.ticket
.tkt_vno
= 5;
817 et
.caddr
= tgt
->caddr
;
821 life
= et
.endtime
- *et
.starttime
;
822 if(client
&& client
->entry
.max_life
)
823 life
= min(life
, *client
->entry
.max_life
);
824 if(server
->entry
.max_life
)
825 life
= min(life
, *server
->entry
.max_life
);
826 et
.endtime
= *et
.starttime
+ life
;
828 if(f
.renewable_ok
&& tgt
->flags
.renewable
&&
829 et
.renew_till
== NULL
&& et
.endtime
< *b
->till
&&
830 tgt
->renew_till
!= NULL
)
832 et
.flags
.renewable
= 1;
833 ALLOC(et
.renew_till
);
834 *et
.renew_till
= *b
->till
;
838 renew
= *et
.renew_till
- et
.authtime
;
839 if(client
&& client
->entry
.max_renew
)
840 renew
= min(renew
, *client
->entry
.max_renew
);
841 if(server
->entry
.max_renew
)
842 renew
= min(renew
, *server
->entry
.max_renew
);
843 *et
.renew_till
= et
.authtime
+ renew
;
847 *et
.renew_till
= min(*et
.renew_till
, *tgt
->renew_till
);
848 *et
.starttime
= min(*et
.starttime
, *et
.renew_till
);
849 et
.endtime
= min(et
.endtime
, *et
.renew_till
);
852 *et
.starttime
= min(*et
.starttime
, et
.endtime
);
854 if(*et
.starttime
== et
.endtime
){
855 ret
= KRB5KDC_ERR_NEVER_VALID
;
858 if(et
.renew_till
&& et
.endtime
== *et
.renew_till
){
860 et
.renew_till
= NULL
;
861 et
.flags
.renewable
= 0;
864 et
.flags
.pre_authent
= tgt
->flags
.pre_authent
;
865 et
.flags
.hw_authent
= tgt
->flags
.hw_authent
;
866 et
.flags
.anonymous
= tgt
->flags
.anonymous
;
867 et
.flags
.ok_as_delegate
= server
->entry
.flags
.ok_as_delegate
;
871 * No not need to filter out the any PAC from the
872 * auth_data since it's signed by the KDC.
874 ret
= _kdc_tkt_add_if_relevant_ad(context
, &et
,
875 KRB5_AUTHDATA_WIN2K_PAC
, rspac
);
883 /* XXX check authdata */
885 if (et
.authorization_data
== NULL
) {
886 et
.authorization_data
= calloc(1, sizeof(*et
.authorization_data
));
887 if (et
.authorization_data
== NULL
) {
889 krb5_set_error_message(context
, ret
, "malloc: out of memory");
893 for(i
= 0; i
< auth_data
->len
; i
++) {
894 ret
= add_AuthorizationData(et
.authorization_data
, &auth_data
->val
[i
]);
896 krb5_set_error_message(context
, ret
, "malloc: out of memory");
901 /* Filter out type KRB5SignedPath */
902 ret
= find_KRB5SignedPath(context
, et
.authorization_data
, NULL
);
904 if (et
.authorization_data
->len
== 1) {
905 free_AuthorizationData(et
.authorization_data
);
906 free(et
.authorization_data
);
907 et
.authorization_data
= NULL
;
909 AuthorizationData
*ad
= et
.authorization_data
;
910 free_AuthorizationDataElement(&ad
->val
[ad
->len
- 1]);
916 ret
= krb5_copy_keyblock_contents(context
, sessionkey
, &et
.key
);
919 et
.crealm
= tgt_name
->realm
;
920 et
.cname
= tgt_name
->name
;
923 /* MIT must have at least one last_req */
925 ek
.last_req
.val
= calloc(1, sizeof(*ek
.last_req
.val
));
926 if (ek
.last_req
.val
== NULL
) {
932 ek
.authtime
= et
.authtime
;
933 ek
.starttime
= et
.starttime
;
934 ek
.endtime
= et
.endtime
;
935 ek
.renew_till
= et
.renew_till
;
936 ek
.srealm
= rep
.ticket
.realm
;
937 ek
.sname
= rep
.ticket
.sname
;
939 _kdc_log_timestamp(context
, config
, "TGS-REQ", et
.authtime
, et
.starttime
,
940 et
.endtime
, et
.renew_till
);
942 /* Don't sign cross realm tickets, they can't be checked anyway */
944 char *r
= get_krbtgt_realm(&ek
.sname
);
946 if (r
== NULL
|| strcmp(r
, ek
.srealm
) == 0) {
947 ret
= _kdc_add_KRB5SignedPath(context
,
960 if (enc_pa_data
->len
) {
961 rep
.padata
= calloc(1, sizeof(*rep
.padata
));
962 if (rep
.padata
== NULL
) {
966 ret
= copy_METHOD_DATA(enc_pa_data
, rep
.padata
);
971 if (krb5_enctype_valid(context
, et
.key
.keytype
) != 0
972 && _kdc_is_weak_exception(server
->entry
.principal
, et
.key
.keytype
))
974 krb5_enctype_enable(context
, et
.key
.keytype
);
979 /* It is somewhat unclear where the etype in the following
980 encryption should come from. What we have is a session
981 key in the passed tgt, and a list of preferred etypes
982 *for the new ticket*. Should we pick the best possible
983 etype, given the keytype in the tgt, or should we look
984 at the etype list here as well? What if the tgt
985 session key is DES3 and we want a ticket with a (say)
986 CAST session key. Should the DES3 etype be added to the
987 etype list, even if we don't want a session key with
989 ret
= _kdc_encode_reply(context
, config
,
990 &rep
, &et
, &ek
, et
.key
.keytype
,
992 serverkey
, 0, replykey
, rk_is_subkey
,
995 krb5_enctype_disable(context
, et
.key
.keytype
);
999 free_TransitedEncoding(&et
.transited
);
1003 free(et
.renew_till
);
1004 if(et
.authorization_data
) {
1005 free_AuthorizationData(et
.authorization_data
);
1006 free(et
.authorization_data
);
1008 free_LastReq(&ek
.last_req
);
1009 memset(et
.key
.keyvalue
.data
, 0, et
.key
.keyvalue
.length
);
1010 free_EncryptionKey(&et
.key
);
1014 static krb5_error_code
1015 tgs_check_authenticator(krb5_context context
,
1016 krb5_kdc_configuration
*config
,
1017 krb5_auth_context ac
,
1019 const char **e_text
,
1022 krb5_authenticator auth
;
1026 krb5_error_code ret
;
1029 krb5_auth_con_getauthenticator(context
, ac
, &auth
);
1030 if(auth
->cksum
== NULL
){
1031 kdc_log(context
, config
, 0, "No authenticator in request");
1032 ret
= KRB5KRB_AP_ERR_INAPP_CKSUM
;
1036 * according to RFC1510 it doesn't need to be keyed,
1037 * but according to the latest draft it needs to.
1041 !krb5_checksum_is_keyed(context
, auth
->cksum
->cksumtype
)
1044 !krb5_checksum_is_collision_proof(context
, auth
->cksum
->cksumtype
)) {
1045 kdc_log(context
, config
, 0, "Bad checksum type in authenticator: %d",
1046 auth
->cksum
->cksumtype
);
1047 ret
= KRB5KRB_AP_ERR_INAPP_CKSUM
;
1051 /* XXX should not re-encode this */
1052 ASN1_MALLOC_ENCODE(KDC_REQ_BODY
, buf
, buf_size
, b
, &len
, ret
);
1054 const char *msg
= krb5_get_error_message(context
, ret
);
1055 kdc_log(context
, config
, 0, "Failed to encode KDC-REQ-BODY: %s", msg
);
1056 krb5_free_error_message(context
, msg
);
1059 if(buf_size
!= len
) {
1061 kdc_log(context
, config
, 0, "Internal error in ASN.1 encoder");
1062 *e_text
= "KDC internal error";
1063 ret
= KRB5KRB_ERR_GENERIC
;
1066 ret
= krb5_crypto_init(context
, key
, 0, &crypto
);
1068 const char *msg
= krb5_get_error_message(context
, ret
);
1070 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1071 krb5_free_error_message(context
, msg
);
1074 ret
= krb5_verify_checksum(context
,
1076 KRB5_KU_TGS_REQ_AUTH_CKSUM
,
1081 krb5_crypto_destroy(context
, crypto
);
1083 const char *msg
= krb5_get_error_message(context
, ret
);
1084 kdc_log(context
, config
, 0,
1085 "Failed to verify authenticator checksum: %s", msg
);
1086 krb5_free_error_message(context
, msg
);
1089 free_Authenticator(auth
);
1099 find_rpath(krb5_context context
, Realm crealm
, Realm srealm
)
1101 const char *new_realm
= krb5_config_get_string(context
,
1112 need_referral(krb5_context context
, krb5_kdc_configuration
*config
,
1113 const KDCOptions
* const options
, krb5_principal server
,
1114 krb5_realm
**realms
)
1118 if(!options
->canonicalize
&& server
->name
.name_type
!= KRB5_NT_SRV_INST
)
1121 if (server
->name
.name_string
.len
== 1)
1122 name
= server
->name
.name_string
.val
[0];
1123 else if (server
->name
.name_string
.len
== 3 &&
1124 strcasecmp("E3514235-4B06-11D1-AB04-00C04FC2DCD2", server
->name
.name_string
.val
[0]) == 0) {
1126 This is used to give referrals for the
1127 E3514235-4B06-11D1-AB04-00C04FC2DCD2/NTDSGUID/DNSDOMAIN
1128 SPN form, which is used for inter-domain communication in AD
1130 name
= server
->name
.name_string
.val
[2];
1131 kdc_log(context
, config
, 0, "Giving 3 part DRSUAPI referral for %s", name
);
1132 *realms
= malloc(sizeof(char *)*2);
1133 if (*realms
== NULL
) {
1134 krb5_set_error_message(context
, ENOMEM
, N_("malloc: out of memory", ""));
1137 (*realms
)[0] = strdup(name
);
1138 (*realms
)[1] = NULL
;
1140 } else if (server
->name
.name_string
.len
> 1)
1141 name
= server
->name
.name_string
.val
[1];
1145 kdc_log(context
, config
, 0, "Searching referral for %s", name
);
1147 return _krb5_get_host_realm_int(context
, name
, FALSE
, realms
) == 0;
1150 static krb5_error_code
1151 tgs_parse_request(krb5_context context
,
1152 krb5_kdc_configuration
*config
,
1154 const PA_DATA
*tgs_req
,
1155 hdb_entry_ex
**krbtgt
,
1156 krb5_enctype
*krbtgt_etype
,
1157 krb5_ticket
**ticket
,
1158 const char **e_text
,
1160 const struct sockaddr
*from_addr
,
1163 AuthorizationData
**auth_data
,
1164 krb5_keyblock
**replykey
,
1167 static char failed
[] = "<unparse_name failed>";
1169 krb5_error_code ret
;
1170 krb5_principal princ
;
1171 krb5_auth_context ac
= NULL
;
1172 krb5_flags ap_req_options
;
1173 krb5_flags verify_ap_req_flags
;
1176 krb5_keyblock
*subkey
= NULL
;
1184 memset(&ap_req
, 0, sizeof(ap_req
));
1185 ret
= krb5_decode_ap_req(context
, &tgs_req
->padata_value
, &ap_req
);
1187 const char *msg
= krb5_get_error_message(context
, ret
);
1188 kdc_log(context
, config
, 0, "Failed to decode AP-REQ: %s", msg
);
1189 krb5_free_error_message(context
, msg
);
1193 if(!get_krbtgt_realm(&ap_req
.ticket
.sname
)){
1194 /* XXX check for ticket.sname == req.sname */
1195 kdc_log(context
, config
, 0, "PA-DATA is not a ticket-granting ticket");
1196 ret
= KRB5KDC_ERR_POLICY
; /* ? */
1200 _krb5_principalname2krb5_principal(context
,
1202 ap_req
.ticket
.sname
,
1203 ap_req
.ticket
.realm
);
1205 ret
= _kdc_db_fetch(context
, config
, princ
, HDB_F_GET_KRBTGT
, ap_req
.ticket
.enc_part
.kvno
, NULL
, krbtgt
);
1207 if(ret
== HDB_ERR_NOT_FOUND_HERE
) {
1209 ret
= krb5_unparse_name(context
, princ
, &p
);
1212 krb5_free_principal(context
, princ
);
1213 kdc_log(context
, config
, 5, "Ticket-granting ticket account %s does not have secrets at this KDC, need to proxy", p
);
1216 ret
= HDB_ERR_NOT_FOUND_HERE
;
1219 const char *msg
= krb5_get_error_message(context
, ret
);
1221 ret
= krb5_unparse_name(context
, princ
, &p
);
1224 krb5_free_principal(context
, princ
);
1225 kdc_log(context
, config
, 0,
1226 "Ticket-granting ticket not found in database: %s", msg
);
1227 krb5_free_error_message(context
, msg
);
1230 ret
= KRB5KRB_AP_ERR_NOT_US
;
1234 if(ap_req
.ticket
.enc_part
.kvno
&&
1235 *ap_req
.ticket
.enc_part
.kvno
!= (*krbtgt
)->entry
.kvno
){
1238 ret
= krb5_unparse_name (context
, princ
, &p
);
1239 krb5_free_principal(context
, princ
);
1242 kdc_log(context
, config
, 0,
1243 "Ticket kvno = %d, DB kvno = %d (%s)",
1244 *ap_req
.ticket
.enc_part
.kvno
,
1245 (*krbtgt
)->entry
.kvno
,
1249 ret
= KRB5KRB_AP_ERR_BADKEYVER
;
1253 *krbtgt_etype
= ap_req
.ticket
.enc_part
.etype
;
1255 ret
= hdb_enctype2key(context
, &(*krbtgt
)->entry
,
1256 ap_req
.ticket
.enc_part
.etype
, &tkey
);
1258 char *str
= NULL
, *p
= NULL
;
1260 krb5_enctype_to_string(context
, ap_req
.ticket
.enc_part
.etype
, &str
);
1261 krb5_unparse_name(context
, princ
, &p
);
1262 kdc_log(context
, config
, 0,
1263 "No server key with enctype %s found for %s",
1264 str
? str
: "<unknown enctype>",
1265 p
? p
: "<unparse_name failed>");
1268 ret
= KRB5KRB_AP_ERR_BADKEYVER
;
1272 if (b
->kdc_options
.validate
)
1273 verify_ap_req_flags
= KRB5_VERIFY_AP_REQ_IGNORE_INVALID
;
1275 verify_ap_req_flags
= 0;
1277 ret
= krb5_verify_ap_req2(context
,
1282 verify_ap_req_flags
,
1285 KRB5_KU_TGS_REQ_AUTH
);
1287 krb5_free_principal(context
, princ
);
1289 const char *msg
= krb5_get_error_message(context
, ret
);
1290 kdc_log(context
, config
, 0, "Failed to verify AP-REQ: %s", msg
);
1291 krb5_free_error_message(context
, msg
);
1296 krb5_authenticator auth
;
1298 ret
= krb5_auth_con_getauthenticator(context
, ac
, &auth
);
1300 *csec
= malloc(sizeof(**csec
));
1301 if (*csec
== NULL
) {
1302 krb5_free_authenticator(context
, &auth
);
1303 kdc_log(context
, config
, 0, "malloc failed");
1306 **csec
= auth
->ctime
;
1307 *cusec
= malloc(sizeof(**cusec
));
1308 if (*cusec
== NULL
) {
1309 krb5_free_authenticator(context
, &auth
);
1310 kdc_log(context
, config
, 0, "malloc failed");
1313 **cusec
= auth
->cusec
;
1314 krb5_free_authenticator(context
, &auth
);
1318 ret
= tgs_check_authenticator(context
, config
,
1319 ac
, b
, e_text
, &(*ticket
)->ticket
.key
);
1321 krb5_auth_con_free(context
, ac
);
1325 usage
= KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY
;
1328 ret
= krb5_auth_con_getremotesubkey(context
, ac
, &subkey
);
1330 const char *msg
= krb5_get_error_message(context
, ret
);
1331 krb5_auth_con_free(context
, ac
);
1332 kdc_log(context
, config
, 0, "Failed to get remote subkey: %s", msg
);
1333 krb5_free_error_message(context
, msg
);
1337 usage
= KRB5_KU_TGS_REQ_AUTH_DAT_SESSION
;
1340 ret
= krb5_auth_con_getkey(context
, ac
, &subkey
);
1342 const char *msg
= krb5_get_error_message(context
, ret
);
1343 krb5_auth_con_free(context
, ac
);
1344 kdc_log(context
, config
, 0, "Failed to get session key: %s", msg
);
1345 krb5_free_error_message(context
, msg
);
1350 krb5_auth_con_free(context
, ac
);
1351 kdc_log(context
, config
, 0,
1352 "Failed to get key for enc-authorization-data");
1353 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1359 if (b
->enc_authorization_data
) {
1362 ret
= krb5_crypto_init(context
, subkey
, 0, &crypto
);
1364 const char *msg
= krb5_get_error_message(context
, ret
);
1365 krb5_auth_con_free(context
, ac
);
1366 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1367 krb5_free_error_message(context
, msg
);
1370 ret
= krb5_decrypt_EncryptedData (context
,
1373 b
->enc_authorization_data
,
1375 krb5_crypto_destroy(context
, crypto
);
1377 krb5_auth_con_free(context
, ac
);
1378 kdc_log(context
, config
, 0,
1379 "Failed to decrypt enc-authorization-data");
1380 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1384 if (*auth_data
== NULL
) {
1385 krb5_auth_con_free(context
, ac
);
1386 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1389 ret
= decode_AuthorizationData(ad
.data
, ad
.length
, *auth_data
, NULL
);
1391 krb5_auth_con_free(context
, ac
);
1394 kdc_log(context
, config
, 0, "Failed to decode authorization data");
1395 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1400 krb5_auth_con_free(context
, ac
);
1403 free_AP_REQ(&ap_req
);
1408 static krb5_error_code
1409 build_server_referral(krb5_context context
,
1410 krb5_kdc_configuration
*config
,
1411 krb5_crypto session
,
1412 krb5_const_realm referred_realm
,
1413 const PrincipalName
*true_principal_name
,
1414 const PrincipalName
*requested_principal
,
1417 PA_ServerReferralData ref
;
1418 krb5_error_code ret
;
1423 memset(&ref
, 0, sizeof(ref
));
1425 if (referred_realm
) {
1426 ALLOC(ref
.referred_realm
);
1427 if (ref
.referred_realm
== NULL
)
1429 *ref
.referred_realm
= strdup(referred_realm
);
1430 if (*ref
.referred_realm
== NULL
)
1433 if (true_principal_name
) {
1434 ALLOC(ref
.true_principal_name
);
1435 if (ref
.true_principal_name
== NULL
)
1437 ret
= copy_PrincipalName(true_principal_name
, ref
.true_principal_name
);
1441 if (requested_principal
) {
1442 ALLOC(ref
.requested_principal_name
);
1443 if (ref
.requested_principal_name
== NULL
)
1445 ret
= copy_PrincipalName(requested_principal
,
1446 ref
.requested_principal_name
);
1451 ASN1_MALLOC_ENCODE(PA_ServerReferralData
,
1452 data
.data
, data
.length
,
1454 free_PA_ServerReferralData(&ref
);
1457 if (data
.length
!= size
)
1458 krb5_abortx(context
, "internal asn.1 encoder error");
1460 ret
= krb5_encrypt_EncryptedData(context
, session
,
1461 KRB5_KU_PA_SERVER_REFERRAL
,
1462 data
.data
, data
.length
,
1468 ASN1_MALLOC_ENCODE(EncryptedData
,
1469 outdata
->data
, outdata
->length
,
1471 free_EncryptedData(&ed
);
1474 if (outdata
->length
!= size
)
1475 krb5_abortx(context
, "internal asn.1 encoder error");
1479 free_PA_ServerReferralData(&ref
);
1480 krb5_set_error_message(context
, ENOMEM
, "malloc: out of memory");
1484 static krb5_error_code
1485 tgs_build_reply(krb5_context context
,
1486 krb5_kdc_configuration
*config
,
1489 hdb_entry_ex
*krbtgt
,
1490 krb5_enctype krbtgt_etype
,
1491 const krb5_keyblock
*replykey
,
1493 krb5_ticket
*ticket
,
1496 const char **e_text
,
1497 AuthorizationData
**auth_data
,
1498 const struct sockaddr
*from_addr
)
1500 krb5_error_code ret
;
1501 krb5_principal cp
= NULL
, sp
= NULL
, tp
= NULL
, dp
= NULL
;
1502 krb5_principal krbtgt_principal
= NULL
;
1503 char *spn
= NULL
, *cpn
= NULL
, *tpn
= NULL
, *dpn
= NULL
;
1504 hdb_entry_ex
*server
= NULL
, *client
= NULL
, *s4u2self_impersonated_client
= NULL
;
1505 HDB
*clientdb
, *s4u2self_impersonated_clientdb
;
1506 krb5_realm ref_realm
= NULL
;
1507 EncTicketPart
*tgt
= &ticket
->ticket
;
1508 krb5_principals spp
= NULL
;
1509 const EncryptionKey
*ekey
;
1510 krb5_keyblock sessionkey
;
1514 hdb_entry_ex
*krbtgt_out
= NULL
;
1516 METHOD_DATA enc_pa_data
;
1521 EncTicketPart adtkt
;
1527 int flags
= HDB_F_FOR_TGS_REQ
;
1529 memset(&sessionkey
, 0, sizeof(sessionkey
));
1530 memset(&adtkt
, 0, sizeof(adtkt
));
1531 krb5_data_zero(&rspac
);
1532 memset(&enc_pa_data
, 0, sizeof(enc_pa_data
));
1537 if (b
->kdc_options
.canonicalize
)
1538 flags
|= HDB_F_CANON
;
1540 if(b
->kdc_options
.enc_tkt_in_skey
){
1546 if(b
->additional_tickets
== NULL
||
1547 b
->additional_tickets
->len
== 0){
1548 ret
= KRB5KDC_ERR_BADOPTION
; /* ? */
1549 kdc_log(context
, config
, 0,
1550 "No second ticket present in request");
1553 t
= &b
->additional_tickets
->val
[0];
1554 if(!get_krbtgt_realm(&t
->sname
)){
1555 kdc_log(context
, config
, 0,
1556 "Additional ticket is not a ticket-granting ticket");
1557 ret
= KRB5KDC_ERR_POLICY
;
1560 _krb5_principalname2krb5_principal(context
, &p
, t
->sname
, t
->realm
);
1561 ret
= _kdc_db_fetch(context
, config
, p
,
1562 HDB_F_GET_KRBTGT
, t
->enc_part
.kvno
,
1564 krb5_free_principal(context
, p
);
1566 if (ret
== HDB_ERR_NOENTRY
)
1567 ret
= KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
;
1570 ret
= hdb_enctype2key(context
, &uu
->entry
,
1571 t
->enc_part
.etype
, &uukey
);
1573 _kdc_free_ent(context
, uu
);
1574 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
; /* XXX */
1577 ret
= krb5_decrypt_ticket(context
, t
, &uukey
->key
, &adtkt
, 0);
1578 _kdc_free_ent(context
, uu
);
1582 ret
= verify_flags(context
, config
, &adtkt
, spn
);
1590 _krb5_principalname2krb5_principal(context
, &sp
, *s
, r
);
1591 ret
= krb5_unparse_name(context
, sp
, &spn
);
1594 _krb5_principalname2krb5_principal(context
, &cp
, tgt
->cname
, tgt
->crealm
);
1595 ret
= krb5_unparse_name(context
, cp
, &cpn
);
1598 unparse_flags (KDCOptions2int(b
->kdc_options
),
1599 asn1_KDCOptions_units(),
1600 opt_str
, sizeof(opt_str
));
1602 kdc_log(context
, config
, 0,
1603 "TGS-REQ %s from %s for %s [%s]",
1604 cpn
, from
, spn
, opt_str
);
1606 kdc_log(context
, config
, 0,
1607 "TGS-REQ %s from %s for %s", cpn
, from
, spn
);
1614 ret
= _kdc_db_fetch(context
, config
, sp
, HDB_F_GET_SERVER
| flags
,
1615 NULL
, NULL
, &server
);
1617 if(ret
== HDB_ERR_NOT_FOUND_HERE
) {
1618 kdc_log(context
, config
, 5, "target %s does not have secrets at this KDC, need to proxy", sp
);
1621 const char *new_rlm
, *msg
;
1625 if ((req_rlm
= get_krbtgt_realm(&sp
->name
)) != NULL
) {
1627 new_rlm
= find_rpath(context
, tgt
->crealm
, req_rlm
);
1629 kdc_log(context
, config
, 5, "krbtgt for realm %s "
1630 "not found, trying %s",
1632 krb5_free_principal(context
, sp
);
1634 krb5_make_principal(context
, &sp
, r
,
1635 KRB5_TGS_NAME
, new_rlm
, NULL
);
1636 ret
= krb5_unparse_name(context
, sp
, &spn
);
1642 ref_realm
= strdup(new_rlm
);
1646 } else if(need_referral(context
, config
, &b
->kdc_options
, sp
, &realms
)) {
1647 if (strcmp(realms
[0], sp
->realm
) != 0) {
1648 kdc_log(context
, config
, 5,
1649 "Returning a referral to realm %s for "
1650 "server %s that was not found",
1652 krb5_free_principal(context
, sp
);
1654 krb5_make_principal(context
, &sp
, r
, KRB5_TGS_NAME
,
1656 ret
= krb5_unparse_name(context
, sp
, &spn
);
1662 ref_realm
= strdup(realms
[0]);
1664 krb5_free_host_realm(context
, realms
);
1667 krb5_free_host_realm(context
, realms
);
1669 msg
= krb5_get_error_message(context
, ret
);
1670 kdc_log(context
, config
, 0,
1671 "Server not found in database: %s: %s", spn
, msg
);
1672 krb5_free_error_message(context
, msg
);
1673 if (ret
== HDB_ERR_NOENTRY
)
1674 ret
= KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
;
1679 * Select enctype, return key and kvno.
1685 if(b
->kdc_options
.enc_tkt_in_skey
) {
1688 for(i
= 0; i
< b
->etype
.len
; i
++)
1689 if (b
->etype
.val
[i
] == adtkt
.key
.keytype
)
1691 if(i
== b
->etype
.len
) {
1692 kdc_log(context
, config
, 0,
1693 "Addition ticket have not matching etypes");
1694 krb5_clear_error_message(context
);
1695 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
;
1698 etype
= b
->etype
.val
[i
];
1703 ret
= _kdc_find_etype(context
,
1704 config
->tgs_use_strongest_session_key
, FALSE
,
1705 server
, b
->etype
.val
, b
->etype
.len
, NULL
,
1708 kdc_log(context
, config
, 0,
1709 "Server (%s) has no support for etypes", spn
);
1713 etype
= skey
->key
.keytype
;
1714 kvno
= server
->entry
.kvno
;
1717 ret
= krb5_generate_random_keyblock(context
, etype
, &sessionkey
);
1723 * Check that service is in the same realm as the krbtgt. If it's
1724 * not the same, it's someone that is using a uni-directional trust
1729 * Validate authoriation data
1732 ret
= hdb_enctype2key(context
, &krbtgt
->entry
,
1733 krbtgt_etype
, &tkey_check
);
1735 kdc_log(context
, config
, 0,
1736 "Failed to find key for krbtgt PAC check");
1740 /* Now refetch the primary krbtgt, and get the current kvno (the
1741 * sign check may have been on an old kvno, and the server may
1742 * have been an incoming trust) */
1743 ret
= krb5_make_principal(context
, &krbtgt_principal
,
1744 krb5_principal_get_comp_string(context
,
1745 krbtgt
->entry
.principal
,
1748 krb5_principal_get_comp_string(context
,
1749 krbtgt
->entry
.principal
,
1752 kdc_log(context
, config
, 0,
1753 "Failed to generate krbtgt principal");
1757 ret
= _kdc_db_fetch(context
, config
, krbtgt_principal
, HDB_F_GET_KRBTGT
, NULL
, NULL
, &krbtgt_out
);
1758 krb5_free_principal(context
, krbtgt_principal
);
1760 krb5_error_code ret2
;
1762 ret
= krb5_unparse_name(context
, krbtgt
->entry
.principal
, &ktpn
);
1763 ret2
= krb5_unparse_name(context
, krbtgt_principal
, &ktpn2
);
1764 kdc_log(context
, config
, 0,
1765 "Request with wrong krbtgt: %s, %s not found in our database",
1766 (ret
== 0) ? ktpn
: "<unknown>", (ret2
== 0) ? ktpn2
: "<unknown>");
1771 ret
= KRB5KRB_AP_ERR_NOT_US
;
1775 /* The first realm is the realm of the service, the second is
1776 * krbtgt/<this>/@REALM component of the krbtgt DN the request was
1777 * encrypted to. The redirection via the krbtgt_out entry allows
1778 * the DB to possibly correct the case of the realm (Samba4 does
1779 * this) before the strcmp() */
1780 if (strcmp(krb5_principal_get_realm(context
, server
->entry
.principal
),
1781 krb5_principal_get_realm(context
, krbtgt_out
->entry
.principal
)) != 0) {
1783 ret
= krb5_unparse_name(context
, krbtgt_out
->entry
.principal
, &ktpn
);
1784 kdc_log(context
, config
, 0,
1785 "Request with wrong krbtgt: %s",
1786 (ret
== 0) ? ktpn
: "<unknown>");
1789 ret
= KRB5KRB_AP_ERR_NOT_US
;
1792 ret
= hdb_enctype2key(context
, &krbtgt_out
->entry
,
1793 krbtgt_etype
, &tkey_sign
);
1795 kdc_log(context
, config
, 0,
1796 "Failed to find key for krbtgt PAC signature");
1800 ret
= _kdc_db_fetch(context
, config
, cp
, HDB_F_GET_CLIENT
| flags
,
1801 NULL
, &clientdb
, &client
);
1802 if(ret
== HDB_ERR_NOT_FOUND_HERE
) {
1803 /* This is OK, we are just trying to find out if they have
1804 * been disabled or deleted in the meantime, missing secrets
1807 const char *krbtgt_realm
, *msg
;
1810 * If the client belongs to the same realm as our krbtgt, it
1811 * should exist in the local database.
1815 krbtgt_realm
= krb5_principal_get_realm(context
, krbtgt_out
->entry
.principal
);
1817 if(strcmp(krb5_principal_get_realm(context
, cp
), krbtgt_realm
) == 0) {
1818 if (ret
== HDB_ERR_NOENTRY
)
1819 ret
= KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
;
1820 kdc_log(context
, config
, 1, "Client no longer in database: %s",
1825 msg
= krb5_get_error_message(context
, ret
);
1826 kdc_log(context
, config
, 1, "Client not found in database: %s", msg
);
1827 krb5_free_error_message(context
, msg
);
1830 ret
= check_PAC(context
, config
, cp
, NULL
,
1831 client
, server
, krbtgt
,
1833 ekey
, &tkey_sign
->key
,
1834 tgt
, &rspac
, &signedpath
);
1836 const char *msg
= krb5_get_error_message(context
, ret
);
1837 kdc_log(context
, config
, 0,
1838 "Verify PAC failed for %s (%s) from %s with %s",
1839 spn
, cpn
, from
, msg
);
1840 krb5_free_error_message(context
, msg
);
1844 /* also check the krbtgt for signature */
1845 ret
= check_KRB5SignedPath(context
,
1853 const char *msg
= krb5_get_error_message(context
, ret
);
1854 kdc_log(context
, config
, 0,
1855 "KRB5SignedPath check failed for %s (%s) from %s with %s",
1856 spn
, cpn
, from
, msg
);
1857 krb5_free_error_message(context
, msg
);
1865 /* by default the tgt principal matches the client principal */
1870 const PA_DATA
*sdata
;
1873 sdata
= _kdc_find_padata(req
, &i
, KRB5_PADATA_FOR_USER
);
1880 ret
= decode_PA_S4U2Self(sdata
->padata_value
.data
,
1881 sdata
->padata_value
.length
,
1884 kdc_log(context
, config
, 0, "Failed to decode PA-S4U2Self");
1888 ret
= _krb5_s4u2self_to_checksumdata(context
, &self
, &datack
);
1892 ret
= krb5_crypto_init(context
, &tgt
->key
, 0, &crypto
);
1894 const char *msg
= krb5_get_error_message(context
, ret
);
1895 free_PA_S4U2Self(&self
);
1896 krb5_data_free(&datack
);
1897 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1898 krb5_free_error_message(context
, msg
);
1902 ret
= krb5_verify_checksum(context
,
1904 KRB5_KU_OTHER_CKSUM
,
1908 krb5_data_free(&datack
);
1909 krb5_crypto_destroy(context
, crypto
);
1911 const char *msg
= krb5_get_error_message(context
, ret
);
1912 free_PA_S4U2Self(&self
);
1913 kdc_log(context
, config
, 0,
1914 "krb5_verify_checksum failed for S4U2Self: %s", msg
);
1915 krb5_free_error_message(context
, msg
);
1919 ret
= _krb5_principalname2krb5_principal(context
,
1923 free_PA_S4U2Self(&self
);
1927 ret
= krb5_unparse_name(context
, tp
, &tpn
);
1931 /* If we were about to put a PAC into the ticket, we better fix it to be the right PAC */
1934 krb5_data_free(&rspac
);
1935 ret
= _kdc_db_fetch(context
, config
, tp
, HDB_F_GET_CLIENT
| flags
,
1936 NULL
, &s4u2self_impersonated_clientdb
, &s4u2self_impersonated_client
);
1941 * If the client belongs to the same realm as our krbtgt, it
1942 * should exist in the local database.
1946 if (ret
== HDB_ERR_NOENTRY
)
1947 ret
= KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
;
1948 msg
= krb5_get_error_message(context
, ret
);
1949 kdc_log(context
, config
, 1,
1950 "S2U4Self principal to impersonate %s not found in database: %s",
1952 krb5_free_error_message(context
, msg
);
1955 ret
= _kdc_pac_generate(context
, s4u2self_impersonated_client
, &p
);
1957 kdc_log(context
, config
, 0, "PAC generation failed for -- %s",
1962 ret
= _krb5_pac_sign(context
, p
, ticket
->ticket
.authtime
,
1963 s4u2self_impersonated_client
->entry
.principal
,
1964 ekey
, &tkey_sign
->key
,
1966 krb5_pac_free(context
, p
);
1968 kdc_log(context
, config
, 0, "PAC signing failed for -- %s",
1976 * Check that service doing the impersonating is
1977 * requesting a ticket to it-self.
1979 ret
= check_s4u2self(context
, config
, clientdb
, client
, sp
);
1981 kdc_log(context
, config
, 0, "S4U2Self: %s is not allowed "
1982 "to impersonate to service "
1983 "(tried for user %s to service %s)",
1989 * If the service isn't trusted for authentication to
1990 * delegation, remove the forward flag.
1993 if (client
->entry
.flags
.trusted_for_delegation
) {
1994 str
= "[forwardable]";
1996 b
->kdc_options
.forwardable
= 0;
1999 kdc_log(context
, config
, 0, "s4u2self %s impersonating %s to "
2000 "service %s %s", cpn
, tpn
, spn
, str
);
2005 * Constrained delegation
2009 && b
->additional_tickets
!= NULL
2010 && b
->additional_tickets
->len
!= 0
2011 && b
->kdc_options
.enc_tkt_in_skey
== 0)
2013 int ad_signedpath
= 0;
2018 * Require that the KDC have issued the service's krbtgt (not
2019 * self-issued ticket with kimpersonate(1).
2022 ret
= KRB5KDC_ERR_BADOPTION
;
2023 kdc_log(context
, config
, 0,
2024 "Constrained delegation done on service ticket %s/%s",
2029 t
= &b
->additional_tickets
->val
[0];
2031 ret
= hdb_enctype2key(context
, &client
->entry
,
2032 t
->enc_part
.etype
, &clientkey
);
2034 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
; /* XXX */
2038 ret
= krb5_decrypt_ticket(context
, t
, &clientkey
->key
, &adtkt
, 0);
2040 kdc_log(context
, config
, 0,
2041 "failed to decrypt ticket for "
2042 "constrained delegation from %s to %s ", cpn
, spn
);
2046 ret
= _krb5_principalname2krb5_principal(context
,
2053 ret
= krb5_unparse_name(context
, tp
, &tpn
);
2057 ret
= _krb5_principalname2krb5_principal(context
,
2064 ret
= krb5_unparse_name(context
, dp
, &dpn
);
2068 /* check that ticket is valid */
2069 if (adtkt
.flags
.forwardable
== 0) {
2070 kdc_log(context
, config
, 0,
2071 "Missing forwardable flag on ticket for "
2072 "constrained delegation from %s (%s) as %s to %s ",
2073 cpn
, dpn
, tpn
, spn
);
2074 ret
= KRB5KDC_ERR_BADOPTION
;
2078 ret
= check_constrained_delegation(context
, config
, clientdb
,
2079 client
, server
, sp
);
2081 kdc_log(context
, config
, 0,
2082 "constrained delegation from %s (%s) as %s to %s not allowed",
2083 cpn
, dpn
, tpn
, spn
);
2087 ret
= verify_flags(context
, config
, &adtkt
, tpn
);
2092 krb5_data_free(&rspac
);
2095 * generate the PAC for the user.
2097 * TODO: pass in t->sname and t->realm and build
2098 * a S4U_DELEGATION_INFO blob to the PAC.
2100 ret
= check_PAC(context
, config
, tp
, dp
,
2101 client
, server
, krbtgt
,
2103 ekey
, &tkey_sign
->key
,
2104 &adtkt
, &rspac
, &ad_signedpath
);
2106 const char *msg
= krb5_get_error_message(context
, ret
);
2107 kdc_log(context
, config
, 0,
2108 "Verify delegated PAC failed to %s for client"
2109 "%s (%s) as %s from %s with %s",
2110 spn
, cpn
, dpn
, tpn
, from
, msg
);
2111 krb5_free_error_message(context
, msg
);
2116 * Check that the KDC issued the user's ticket.
2118 ret
= check_KRB5SignedPath(context
,
2126 const char *msg
= krb5_get_error_message(context
, ret
);
2127 kdc_log(context
, config
, 0,
2128 "KRB5SignedPath check from service %s failed "
2129 "for delegation to %s for client %s (%s)"
2130 "from %s failed with %s",
2131 spn
, tpn
, dpn
, cpn
, from
, msg
);
2132 krb5_free_error_message(context
, msg
);
2136 if (!ad_signedpath
) {
2137 ret
= KRB5KDC_ERR_BADOPTION
;
2138 kdc_log(context
, config
, 0,
2139 "Ticket not signed with PAC nor SignedPath service %s failed "
2140 "for delegation to %s for client %s (%s)"
2142 spn
, tpn
, dpn
, cpn
, from
);
2146 kdc_log(context
, config
, 0, "constrained delegation for %s "
2147 "from %s (%s) to %s", tpn
, cpn
, dpn
, spn
);
2154 ret
= kdc_check_flags(context
, config
,
2161 if((b
->kdc_options
.validate
|| b
->kdc_options
.renew
) &&
2162 !krb5_principal_compare(context
,
2163 krbtgt
->entry
.principal
,
2164 server
->entry
.principal
)){
2165 kdc_log(context
, config
, 0, "Inconsistent request.");
2166 ret
= KRB5KDC_ERR_SERVER_NOMATCH
;
2170 /* check for valid set of addresses */
2171 if(!_kdc_check_addresses(context
, config
, tgt
->caddr
, from_addr
)) {
2172 ret
= KRB5KRB_AP_ERR_BADADDR
;
2173 kdc_log(context
, config
, 0, "Request from wrong address");
2178 * If this is an referral, add server referral data to the
2185 kdc_log(context
, config
, 0,
2186 "Adding server referral to %s", ref_realm
);
2188 ret
= krb5_crypto_init(context
, &sessionkey
, 0, &crypto
);
2192 ret
= build_server_referral(context
, config
, crypto
, ref_realm
,
2193 NULL
, s
, &pa
.padata_value
);
2194 krb5_crypto_destroy(context
, crypto
);
2196 kdc_log(context
, config
, 0,
2197 "Failed building server referral");
2200 pa
.padata_type
= KRB5_PADATA_SERVER_REFERRAL
;
2202 ret
= add_METHOD_DATA(&enc_pa_data
, &pa
);
2203 krb5_data_free(&pa
.padata_value
);
2205 kdc_log(context
, config
, 0,
2206 "Add server referral METHOD-DATA failed");
2215 ret
= tgs_make_reply(context
,
2227 server
->entry
.principal
,
2247 krb5_data_free(&rspac
);
2248 krb5_free_keyblock_contents(context
, &sessionkey
);
2250 _kdc_free_ent(context
, krbtgt_out
);
2252 _kdc_free_ent(context
, server
);
2254 _kdc_free_ent(context
, client
);
2255 if(s4u2self_impersonated_client
)
2256 _kdc_free_ent(context
, s4u2self_impersonated_client
);
2259 krb5_free_principal(context
, tp
);
2261 krb5_free_principal(context
, cp
);
2263 krb5_free_principal(context
, dp
);
2265 krb5_free_principal(context
, sp
);
2268 free_METHOD_DATA(&enc_pa_data
);
2270 free_EncTicketPart(&adtkt
);
2280 _kdc_tgs_rep(krb5_context context
,
2281 krb5_kdc_configuration
*config
,
2285 struct sockaddr
*from_addr
,
2288 AuthorizationData
*auth_data
= NULL
;
2289 krb5_error_code ret
;
2291 const PA_DATA
*tgs_req
;
2293 hdb_entry_ex
*krbtgt
= NULL
;
2294 krb5_ticket
*ticket
= NULL
;
2295 const char *e_text
= NULL
;
2296 krb5_enctype krbtgt_etype
= ETYPE_NULL
;
2298 krb5_keyblock
*replykey
= NULL
;
2299 int rk_is_subkey
= 0;
2300 time_t *csec
= NULL
;
2303 if(req
->padata
== NULL
){
2304 ret
= KRB5KDC_ERR_PREAUTH_REQUIRED
; /* XXX ??? */
2305 kdc_log(context
, config
, 0,
2306 "TGS-REQ from %s without PA-DATA", from
);
2310 tgs_req
= _kdc_find_padata(req
, &i
, KRB5_PADATA_TGS_REQ
);
2312 if(tgs_req
== NULL
){
2313 ret
= KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
2315 kdc_log(context
, config
, 0,
2316 "TGS-REQ from %s without PA-TGS-REQ", from
);
2319 ret
= tgs_parse_request(context
, config
,
2320 &req
->req_body
, tgs_req
,
2330 if (ret
== HDB_ERR_NOT_FOUND_HERE
) {
2331 /* kdc_log() is called in tgs_parse_request() */
2335 kdc_log(context
, config
, 0,
2336 "Failed parsing TGS-REQ from %s", from
);
2340 ret
= tgs_build_reply(context
,
2355 kdc_log(context
, config
, 0,
2356 "Failed building TGS-REP to %s", from
);
2361 if (datagram_reply
&& data
->length
> config
->max_datagram_reply_length
) {
2362 krb5_data_free(data
);
2363 ret
= KRB5KRB_ERR_RESPONSE_TOO_BIG
;
2364 e_text
= "Reply packet too large";
2369 krb5_free_keyblock(context
, replykey
);
2370 if(ret
&& ret
!= HDB_ERR_NOT_FOUND_HERE
&& data
->data
== NULL
){
2371 krb5_mk_error(context
,
2385 krb5_free_ticket(context
, ticket
);
2387 _kdc_free_ent(context
, krbtgt
);
2390 free_AuthorizationData(auth_data
);