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
39 * return the realm of a krbtgt-ticket or NULL
43 get_krbtgt_realm(const PrincipalName
*p
)
45 if(p
->name_string
.len
== 2
46 && strcmp(p
->name_string
.val
[0], KRB5_TGS_NAME
) == 0)
47 return p
->name_string
.val
[1];
53 * The KDC might add a signed path to the ticket authorization data
54 * field. This is to avoid server impersonating clients and the
55 * request constrained delegation.
57 * This is done by storing a KRB5_AUTHDATA_IF_RELEVANT with a single
58 * entry of type KRB5SignedPath.
61 static krb5_error_code
62 find_KRB5SignedPath(krb5_context context
,
63 const AuthorizationData
*ad
,
66 AuthorizationData child
;
70 if (ad
== NULL
|| ad
->len
== 0)
71 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
75 if (ad
->val
[pos
].ad_type
!= KRB5_AUTHDATA_IF_RELEVANT
)
76 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
78 ret
= decode_AuthorizationData(ad
->val
[pos
].ad_data
.data
,
79 ad
->val
[pos
].ad_data
.length
,
83 krb5_set_error_message(context
, ret
, "Failed to decode "
84 "IF_RELEVANT with %d", ret
);
89 free_AuthorizationData(&child
);
90 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
93 if (child
.val
[0].ad_type
!= KRB5_AUTHDATA_SIGNTICKET
) {
94 free_AuthorizationData(&child
);
95 return KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
99 ret
= der_copy_octet_string(&child
.val
[0].ad_data
, data
);
100 free_AuthorizationData(&child
);
105 _kdc_add_KRB5SignedPath(krb5_context context
,
106 krb5_kdc_configuration
*config
,
107 hdb_entry_ex
*krbtgt
,
108 krb5_enctype enctype
,
109 krb5_principal client
,
110 krb5_const_principal server
,
111 krb5_principals principals
,
117 krb5_crypto crypto
= NULL
;
120 if (server
&& principals
) {
121 ret
= add_Principals(principals
, server
);
127 KRB5SignedPathData spd
;
130 spd
.authtime
= tkt
->authtime
;
131 spd
.delegated
= principals
;
132 spd
.method_data
= NULL
;
134 ASN1_MALLOC_ENCODE(KRB5SignedPathData
, data
.data
, data
.length
,
138 if (data
.length
!= size
)
139 krb5_abortx(context
, "internal asn.1 encoder error");
144 ret
= hdb_enctype2key(context
, &krbtgt
->entry
, enctype
, &key
);
146 ret
= krb5_crypto_init(context
, &key
->key
, 0, &crypto
);
154 * Fill in KRB5SignedPath
158 sp
.delegated
= principals
;
159 sp
.method_data
= NULL
;
161 ret
= krb5_create_checksum(context
, crypto
, KRB5_KU_KRB5SIGNEDPATH
, 0,
162 data
.data
, data
.length
, &sp
.cksum
);
163 krb5_crypto_destroy(context
, crypto
);
168 ASN1_MALLOC_ENCODE(KRB5SignedPath
, data
.data
, data
.length
, &sp
, &size
, ret
);
169 free_Checksum(&sp
.cksum
);
172 if (data
.length
!= size
)
173 krb5_abortx(context
, "internal asn.1 encoder error");
177 * Add IF-RELEVANT(KRB5SignedPath) to the last slot in
178 * authorization data field.
181 ret
= _kdc_tkt_add_if_relevant_ad(context
, tkt
,
182 KRB5_AUTHDATA_SIGNTICKET
, &data
);
183 krb5_data_free(&data
);
188 static krb5_error_code
189 check_KRB5SignedPath(krb5_context context
,
190 krb5_kdc_configuration
*config
,
191 hdb_entry_ex
*krbtgt
,
194 krb5_principals
*delegated
,
199 krb5_crypto crypto
= NULL
;
204 ret
= find_KRB5SignedPath(context
, tkt
->authorization_data
, &data
);
206 KRB5SignedPathData spd
;
210 ret
= decode_KRB5SignedPath(data
.data
, data
.length
, &sp
, NULL
);
211 krb5_data_free(&data
);
216 spd
.authtime
= tkt
->authtime
;
217 spd
.delegated
= sp
.delegated
;
218 spd
.method_data
= sp
.method_data
;
220 ASN1_MALLOC_ENCODE(KRB5SignedPathData
, data
.data
, data
.length
,
223 free_KRB5SignedPath(&sp
);
226 if (data
.length
!= size
)
227 krb5_abortx(context
, "internal asn.1 encoder error");
231 ret
= hdb_enctype2key(context
, &krbtgt
->entry
, sp
.etype
, &key
);
233 ret
= krb5_crypto_init(context
, &key
->key
, 0, &crypto
);
236 free_KRB5SignedPath(&sp
);
240 ret
= krb5_verify_checksum(context
, crypto
, KRB5_KU_KRB5SIGNEDPATH
,
241 data
.data
, data
.length
,
243 krb5_crypto_destroy(context
, crypto
);
246 free_KRB5SignedPath(&sp
);
247 kdc_log(context
, config
, 5,
248 "KRB5SignedPath not signed correctly, not marking as signed");
252 if (delegated
&& sp
.delegated
) {
254 *delegated
= malloc(sizeof(*sp
.delegated
));
255 if (*delegated
== NULL
) {
256 free_KRB5SignedPath(&sp
);
260 ret
= copy_Principals(*delegated
, sp
.delegated
);
262 free_KRB5SignedPath(&sp
);
268 free_KRB5SignedPath(&sp
);
280 static krb5_error_code
281 check_PAC(krb5_context context
,
282 krb5_kdc_configuration
*config
,
283 const krb5_principal client_principal
,
284 hdb_entry_ex
*client
,
285 hdb_entry_ex
*server
,
286 const EncryptionKey
*server_key
,
287 const EncryptionKey
*krbtgt_key
,
292 AuthorizationData
*ad
= tkt
->authorization_data
;
296 if (ad
== NULL
|| ad
->len
== 0)
299 for (i
= 0; i
< ad
->len
; i
++) {
300 AuthorizationData child
;
302 if (ad
->val
[i
].ad_type
!= KRB5_AUTHDATA_IF_RELEVANT
)
305 ret
= decode_AuthorizationData(ad
->val
[i
].ad_data
.data
,
306 ad
->val
[i
].ad_data
.length
,
310 krb5_set_error_message(context
, ret
, "Failed to decode "
311 "IF_RELEVANT with %d", ret
);
314 for (j
= 0; j
< child
.len
; j
++) {
316 if (child
.val
[j
].ad_type
== KRB5_AUTHDATA_WIN2K_PAC
) {
320 ret
= krb5_pac_parse(context
,
321 child
.val
[j
].ad_data
.data
,
322 child
.val
[j
].ad_data
.length
,
324 free_AuthorizationData(&child
);
328 ret
= krb5_pac_verify(context
, pac
, tkt
->authtime
,
332 krb5_pac_free(context
, pac
);
336 ret
= _kdc_pac_verify(context
, client_principal
,
337 client
, server
, &pac
);
339 krb5_pac_free(context
, pac
);
344 ret
= _krb5_pac_sign(context
, pac
, tkt
->authtime
,
346 server_key
, krbtgt_key
, rspac
);
348 krb5_pac_free(context
, pac
);
353 free_AuthorizationData(&child
);
362 static krb5_error_code
363 check_tgs_flags(krb5_context context
,
364 krb5_kdc_configuration
*config
,
365 KDC_REQ_BODY
*b
, const EncTicketPart
*tgt
, EncTicketPart
*et
)
367 KDCOptions f
= b
->kdc_options
;
370 if(!tgt
->flags
.invalid
|| tgt
->starttime
== NULL
){
371 kdc_log(context
, config
, 0,
372 "Bad request to validate ticket");
373 return KRB5KDC_ERR_BADOPTION
;
375 if(*tgt
->starttime
> kdc_time
){
376 kdc_log(context
, config
, 0,
377 "Early request to validate ticket");
378 return KRB5KRB_AP_ERR_TKT_NYV
;
381 et
->flags
.invalid
= 0;
382 }else if(tgt
->flags
.invalid
){
383 kdc_log(context
, config
, 0,
384 "Ticket-granting ticket has INVALID flag set");
385 return KRB5KRB_AP_ERR_TKT_INVALID
;
389 if(!tgt
->flags
.forwardable
){
390 kdc_log(context
, config
, 0,
391 "Bad request for forwardable ticket");
392 return KRB5KDC_ERR_BADOPTION
;
394 et
->flags
.forwardable
= 1;
397 if(!tgt
->flags
.forwardable
){
398 kdc_log(context
, config
, 0,
399 "Request to forward non-forwardable ticket");
400 return KRB5KDC_ERR_BADOPTION
;
402 et
->flags
.forwarded
= 1;
403 et
->caddr
= b
->addresses
;
405 if(tgt
->flags
.forwarded
)
406 et
->flags
.forwarded
= 1;
409 if(!tgt
->flags
.proxiable
){
410 kdc_log(context
, config
, 0,
411 "Bad request for proxiable ticket");
412 return KRB5KDC_ERR_BADOPTION
;
414 et
->flags
.proxiable
= 1;
417 if(!tgt
->flags
.proxiable
){
418 kdc_log(context
, config
, 0,
419 "Request to proxy non-proxiable ticket");
420 return KRB5KDC_ERR_BADOPTION
;
423 et
->caddr
= b
->addresses
;
428 if(f
.allow_postdate
){
429 if(!tgt
->flags
.may_postdate
){
430 kdc_log(context
, config
, 0,
431 "Bad request for post-datable ticket");
432 return KRB5KDC_ERR_BADOPTION
;
434 et
->flags
.may_postdate
= 1;
437 if(!tgt
->flags
.may_postdate
){
438 kdc_log(context
, config
, 0,
439 "Bad request for postdated ticket");
440 return KRB5KDC_ERR_BADOPTION
;
443 *et
->starttime
= *b
->from
;
444 et
->flags
.postdated
= 1;
445 et
->flags
.invalid
= 1;
446 }else if(b
->from
&& *b
->from
> kdc_time
+ context
->max_skew
){
447 kdc_log(context
, config
, 0, "Ticket cannot be postdated");
448 return KRB5KDC_ERR_CANNOT_POSTDATE
;
452 if(!tgt
->flags
.renewable
){
453 kdc_log(context
, config
, 0,
454 "Bad request for renewable ticket");
455 return KRB5KDC_ERR_BADOPTION
;
457 et
->flags
.renewable
= 1;
458 ALLOC(et
->renew_till
);
459 _kdc_fix_time(&b
->rtime
);
460 *et
->renew_till
= *b
->rtime
;
464 if(!tgt
->flags
.renewable
|| tgt
->renew_till
== NULL
){
465 kdc_log(context
, config
, 0,
466 "Request to renew non-renewable ticket");
467 return KRB5KDC_ERR_BADOPTION
;
469 old_life
= tgt
->endtime
;
471 old_life
-= *tgt
->starttime
;
473 old_life
-= tgt
->authtime
;
474 et
->endtime
= *et
->starttime
+ old_life
;
475 if (et
->renew_till
!= NULL
)
476 et
->endtime
= min(*et
->renew_till
, et
->endtime
);
480 /* checks for excess flags */
481 if(f
.request_anonymous
&& !config
->allow_anonymous
){
482 kdc_log(context
, config
, 0,
483 "Request for anonymous ticket");
484 return KRB5KDC_ERR_BADOPTION
;
494 static krb5_error_code
495 check_constrained_delegation(krb5_context context
,
496 krb5_kdc_configuration
*config
,
498 hdb_entry_ex
*client
,
499 krb5_const_principal server
)
501 const HDB_Ext_Constrained_delegation_acl
*acl
;
505 /* if client delegates to itself, that ok */
506 if (krb5_principal_compare(context
, client
->entry
.principal
, server
) == TRUE
)
509 if (clientdb
->hdb_check_constrained_delegation
) {
510 ret
= clientdb
->hdb_check_constrained_delegation(context
, clientdb
, client
, server
);
514 ret
= hdb_entry_get_ConstrainedDelegACL(&client
->entry
, &acl
);
516 krb5_clear_error_message(context
);
521 for (i
= 0; i
< acl
->len
; i
++) {
522 if (krb5_principal_compare(context
, server
, &acl
->val
[i
]) == TRUE
)
526 ret
= KRB5KDC_ERR_BADOPTION
;
528 kdc_log(context
, config
, 0,
529 "Bad request for constrained delegation");
537 static krb5_error_code
538 verify_flags (krb5_context context
,
539 krb5_kdc_configuration
*config
,
540 const EncTicketPart
*et
,
543 if(et
->endtime
< kdc_time
){
544 kdc_log(context
, config
, 0, "Ticket expired (%s)", pstr
);
545 return KRB5KRB_AP_ERR_TKT_EXPIRED
;
547 if(et
->flags
.invalid
){
548 kdc_log(context
, config
, 0, "Ticket not valid (%s)", pstr
);
549 return KRB5KRB_AP_ERR_TKT_NYV
;
558 static krb5_error_code
559 fix_transited_encoding(krb5_context context
,
560 krb5_kdc_configuration
*config
,
561 krb5_boolean check_policy
,
562 const TransitedEncoding
*tr
,
564 const char *client_realm
,
565 const char *server_realm
,
566 const char *tgt_realm
)
568 krb5_error_code ret
= 0;
569 char **realms
, **tmp
;
570 unsigned int num_realms
;
573 switch (tr
->tr_type
) {
574 case DOMAIN_X500_COMPRESS
:
578 * Allow empty content of type 0 because that is was Microsoft
579 * generates in their TGT.
581 if (tr
->contents
.length
== 0)
583 kdc_log(context
, config
, 0,
584 "Transited type 0 with non empty content");
585 return KRB5KDC_ERR_TRTYPE_NOSUPP
;
587 kdc_log(context
, config
, 0,
588 "Unknown transited type: %u", tr
->tr_type
);
589 return KRB5KDC_ERR_TRTYPE_NOSUPP
;
592 ret
= krb5_domain_x500_decode(context
,
599 krb5_warn(context
, ret
,
600 "Decoding transited encoding");
603 if(strcmp(client_realm
, tgt_realm
) && strcmp(server_realm
, tgt_realm
)) {
604 /* not us, so add the previous realm to transited set */
605 if (num_realms
+ 1 > UINT_MAX
/sizeof(*realms
)) {
609 tmp
= realloc(realms
, (num_realms
+ 1) * sizeof(*realms
));
615 realms
[num_realms
] = strdup(tgt_realm
);
616 if(realms
[num_realms
] == NULL
){
622 if(num_realms
== 0) {
623 if(strcmp(client_realm
, server_realm
))
624 kdc_log(context
, config
, 0,
625 "cross-realm %s -> %s", client_realm
, server_realm
);
629 for(i
= 0; i
< num_realms
; i
++)
630 l
+= strlen(realms
[i
]) + 2;
634 for(i
= 0; i
< num_realms
; i
++) {
636 strlcat(rs
, ", ", l
);
637 strlcat(rs
, realms
[i
], l
);
639 kdc_log(context
, config
, 0,
640 "cross-realm %s -> %s via [%s]",
641 client_realm
, server_realm
, rs
);
646 ret
= krb5_check_transited(context
, client_realm
,
648 realms
, num_realms
, NULL
);
650 krb5_warn(context
, ret
, "cross-realm %s -> %s",
651 client_realm
, server_realm
);
654 et
->flags
.transited_policy_checked
= 1;
656 et
->transited
.tr_type
= DOMAIN_X500_COMPRESS
;
657 ret
= krb5_domain_x500_encode(realms
, num_realms
, &et
->transited
.contents
);
659 krb5_warn(context
, ret
, "Encoding transited encoding");
661 for(i
= 0; i
< num_realms
; i
++)
668 static krb5_error_code
669 tgs_make_reply(krb5_context context
,
670 krb5_kdc_configuration
*config
,
672 krb5_const_principal tgt_name
,
673 const EncTicketPart
*tgt
,
674 const krb5_keyblock
*replykey
,
676 const EncryptionKey
*serverkey
,
677 const krb5_keyblock
*sessionkey
,
679 AuthorizationData
*auth_data
,
680 hdb_entry_ex
*server
,
681 krb5_principal server_principal
,
682 const char *server_name
,
683 hdb_entry_ex
*client
,
684 krb5_principal client_principal
,
685 hdb_entry_ex
*krbtgt
,
686 krb5_enctype krbtgt_etype
,
688 const krb5_data
*rspac
,
689 const METHOD_DATA
*enc_pa_data
,
696 KDCOptions f
= b
->kdc_options
;
700 memset(&rep
, 0, sizeof(rep
));
701 memset(&et
, 0, sizeof(et
));
702 memset(&ek
, 0, sizeof(ek
));
705 rep
.msg_type
= krb_tgs_rep
;
707 et
.authtime
= tgt
->authtime
;
708 _kdc_fix_time(&b
->till
);
709 et
.endtime
= min(tgt
->endtime
, *b
->till
);
711 *et
.starttime
= kdc_time
;
713 ret
= check_tgs_flags(context
, config
, b
, tgt
, &et
);
717 /* We should check the transited encoding if:
718 1) the request doesn't ask not to be checked
719 2) globally enforcing a check
720 3) principal requires checking
721 4) we allow non-check per-principal, but principal isn't marked as allowing this
722 5) we don't globally allow this
725 #define GLOBAL_FORCE_TRANSITED_CHECK \
726 (config->trpolicy == TRPOLICY_ALWAYS_CHECK)
727 #define GLOBAL_ALLOW_PER_PRINCIPAL \
728 (config->trpolicy == TRPOLICY_ALLOW_PER_PRINCIPAL)
729 #define GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK \
730 (config->trpolicy == TRPOLICY_ALWAYS_HONOUR_REQUEST)
732 /* these will consult the database in future release */
733 #define PRINCIPAL_FORCE_TRANSITED_CHECK(P) 0
734 #define PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(P) 0
736 ret
= fix_transited_encoding(context
, config
,
737 !f
.disable_transited_check
||
738 GLOBAL_FORCE_TRANSITED_CHECK
||
739 PRINCIPAL_FORCE_TRANSITED_CHECK(server
) ||
740 !((GLOBAL_ALLOW_PER_PRINCIPAL
&&
741 PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(server
)) ||
742 GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK
),
743 &tgt
->transited
, &et
,
744 krb5_principal_get_realm(context
, client_principal
),
745 krb5_principal_get_realm(context
, server
->entry
.principal
),
746 krb5_principal_get_realm(context
, krbtgt
->entry
.principal
));
750 copy_Realm(&server_principal
->realm
, &rep
.ticket
.realm
);
751 _krb5_principal2principalname(&rep
.ticket
.sname
, server_principal
);
752 copy_Realm(&tgt_name
->realm
, &rep
.crealm
);
754 if (f.request_anonymous)
755 _kdc_make_anonymous_principalname (&rep.cname);
758 copy_PrincipalName(&tgt_name
->name
, &rep
.cname
);
759 rep
.ticket
.tkt_vno
= 5;
763 et
.caddr
= tgt
->caddr
;
767 life
= et
.endtime
- *et
.starttime
;
768 if(client
&& client
->entry
.max_life
)
769 life
= min(life
, *client
->entry
.max_life
);
770 if(server
->entry
.max_life
)
771 life
= min(life
, *server
->entry
.max_life
);
772 et
.endtime
= *et
.starttime
+ life
;
774 if(f
.renewable_ok
&& tgt
->flags
.renewable
&&
775 et
.renew_till
== NULL
&& et
.endtime
< *b
->till
){
776 et
.flags
.renewable
= 1;
777 ALLOC(et
.renew_till
);
778 *et
.renew_till
= *b
->till
;
782 renew
= *et
.renew_till
- et
.authtime
;
783 if(client
&& client
->entry
.max_renew
)
784 renew
= min(renew
, *client
->entry
.max_renew
);
785 if(server
->entry
.max_renew
)
786 renew
= min(renew
, *server
->entry
.max_renew
);
787 *et
.renew_till
= et
.authtime
+ renew
;
791 *et
.renew_till
= min(*et
.renew_till
, *tgt
->renew_till
);
792 *et
.starttime
= min(*et
.starttime
, *et
.renew_till
);
793 et
.endtime
= min(et
.endtime
, *et
.renew_till
);
796 *et
.starttime
= min(*et
.starttime
, et
.endtime
);
798 if(*et
.starttime
== et
.endtime
){
799 ret
= KRB5KDC_ERR_NEVER_VALID
;
802 if(et
.renew_till
&& et
.endtime
== *et
.renew_till
){
804 et
.renew_till
= NULL
;
805 et
.flags
.renewable
= 0;
808 et
.flags
.pre_authent
= tgt
->flags
.pre_authent
;
809 et
.flags
.hw_authent
= tgt
->flags
.hw_authent
;
810 et
.flags
.anonymous
= tgt
->flags
.anonymous
;
811 et
.flags
.ok_as_delegate
= server
->entry
.flags
.ok_as_delegate
;
815 * No not need to filter out the any PAC from the
816 * auth_data since it's signed by the KDC.
818 ret
= _kdc_tkt_add_if_relevant_ad(context
, &et
,
819 KRB5_AUTHDATA_WIN2K_PAC
, rspac
);
827 /* XXX check authdata */
829 if (et
.authorization_data
== NULL
) {
830 et
.authorization_data
= calloc(1, sizeof(*et
.authorization_data
));
831 if (et
.authorization_data
== NULL
) {
833 krb5_set_error_message(context
, ret
, "malloc: out of memory");
837 for(i
= 0; i
< auth_data
->len
; i
++) {
838 ret
= add_AuthorizationData(et
.authorization_data
, &auth_data
->val
[i
]);
840 krb5_set_error_message(context
, ret
, "malloc: out of memory");
845 /* Filter out type KRB5SignedPath */
846 ret
= find_KRB5SignedPath(context
, et
.authorization_data
, NULL
);
848 if (et
.authorization_data
->len
== 1) {
849 free_AuthorizationData(et
.authorization_data
);
850 free(et
.authorization_data
);
851 et
.authorization_data
= NULL
;
853 AuthorizationData
*ad
= et
.authorization_data
;
854 free_AuthorizationDataElement(&ad
->val
[ad
->len
- 1]);
860 ret
= krb5_copy_keyblock_contents(context
, sessionkey
, &et
.key
);
863 et
.crealm
= tgt
->crealm
;
864 et
.cname
= tgt_name
->name
;
867 /* MIT must have at least one last_req */
869 ek
.last_req
.val
= calloc(1, sizeof(*ek
.last_req
.val
));
870 if (ek
.last_req
.val
== NULL
) {
876 ek
.authtime
= et
.authtime
;
877 ek
.starttime
= et
.starttime
;
878 ek
.endtime
= et
.endtime
;
879 ek
.renew_till
= et
.renew_till
;
880 ek
.srealm
= rep
.ticket
.realm
;
881 ek
.sname
= rep
.ticket
.sname
;
883 _kdc_log_timestamp(context
, config
, "TGS-REQ", et
.authtime
, et
.starttime
,
884 et
.endtime
, et
.renew_till
);
886 /* Don't sign cross realm tickets, they can't be checked anyway */
888 char *r
= get_krbtgt_realm(&ek
.sname
);
890 if (r
== NULL
|| strcmp(r
, ek
.srealm
) == 0) {
891 ret
= _kdc_add_KRB5SignedPath(context
,
904 if (enc_pa_data
->len
) {
905 rep
.padata
= calloc(1, sizeof(*rep
.padata
));
906 if (rep
.padata
== NULL
) {
910 ret
= copy_METHOD_DATA(enc_pa_data
, rep
.padata
);
915 if (krb5_enctype_valid(context
, et
.key
.keytype
) != 0
916 && _kdc_is_weak_exception(server
->entry
.principal
, et
.key
.keytype
))
918 krb5_enctype_enable(context
, et
.key
.keytype
);
923 /* It is somewhat unclear where the etype in the following
924 encryption should come from. What we have is a session
925 key in the passed tgt, and a list of preferred etypes
926 *for the new ticket*. Should we pick the best possible
927 etype, given the keytype in the tgt, or should we look
928 at the etype list here as well? What if the tgt
929 session key is DES3 and we want a ticket with a (say)
930 CAST session key. Should the DES3 etype be added to the
931 etype list, even if we don't want a session key with
933 ret
= _kdc_encode_reply(context
, config
,
934 &rep
, &et
, &ek
, et
.key
.keytype
,
936 serverkey
, 0, replykey
, rk_is_subkey
,
939 krb5_enctype_disable(context
, et
.key
.keytype
);
943 free_TransitedEncoding(&et
.transited
);
948 if(et
.authorization_data
) {
949 free_AuthorizationData(et
.authorization_data
);
950 free(et
.authorization_data
);
952 free_LastReq(&ek
.last_req
);
953 memset(et
.key
.keyvalue
.data
, 0, et
.key
.keyvalue
.length
);
954 free_EncryptionKey(&et
.key
);
958 static krb5_error_code
959 tgs_check_authenticator(krb5_context context
,
960 krb5_kdc_configuration
*config
,
961 krb5_auth_context ac
,
966 krb5_authenticator auth
;
973 krb5_auth_con_getauthenticator(context
, ac
, &auth
);
974 if(auth
->cksum
== NULL
){
975 kdc_log(context
, config
, 0, "No authenticator in request");
976 ret
= KRB5KRB_AP_ERR_INAPP_CKSUM
;
980 * according to RFC1510 it doesn't need to be keyed,
981 * but according to the latest draft it needs to.
985 !krb5_checksum_is_keyed(context
, auth
->cksum
->cksumtype
)
988 !krb5_checksum_is_collision_proof(context
, auth
->cksum
->cksumtype
)) {
989 kdc_log(context
, config
, 0, "Bad checksum type in authenticator: %d",
990 auth
->cksum
->cksumtype
);
991 ret
= KRB5KRB_AP_ERR_INAPP_CKSUM
;
995 /* XXX should not re-encode this */
996 ASN1_MALLOC_ENCODE(KDC_REQ_BODY
, buf
, buf_size
, b
, &len
, ret
);
998 const char *msg
= krb5_get_error_message(context
, ret
);
999 kdc_log(context
, config
, 0, "Failed to encode KDC-REQ-BODY: %s", msg
);
1000 krb5_free_error_message(context
, msg
);
1003 if(buf_size
!= len
) {
1005 kdc_log(context
, config
, 0, "Internal error in ASN.1 encoder");
1006 *e_text
= "KDC internal error";
1007 ret
= KRB5KRB_ERR_GENERIC
;
1010 ret
= krb5_crypto_init(context
, key
, 0, &crypto
);
1012 const char *msg
= krb5_get_error_message(context
, ret
);
1014 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1015 krb5_free_error_message(context
, msg
);
1018 ret
= krb5_verify_checksum(context
,
1020 KRB5_KU_TGS_REQ_AUTH_CKSUM
,
1025 krb5_crypto_destroy(context
, crypto
);
1027 const char *msg
= krb5_get_error_message(context
, ret
);
1028 kdc_log(context
, config
, 0,
1029 "Failed to verify authenticator checksum: %s", msg
);
1030 krb5_free_error_message(context
, msg
);
1033 free_Authenticator(auth
);
1043 find_rpath(krb5_context context
, Realm crealm
, Realm srealm
)
1045 const char *new_realm
= krb5_config_get_string(context
,
1056 need_referral(krb5_context context
, krb5_kdc_configuration
*config
,
1057 const KDCOptions
* const options
, krb5_principal server
,
1058 krb5_realm
**realms
)
1062 if(!options
->canonicalize
&& server
->name
.name_type
!= KRB5_NT_SRV_INST
)
1065 if (server
->name
.name_string
.len
== 1)
1066 name
= server
->name
.name_string
.val
[0];
1067 else if (server
->name
.name_string
.len
> 1)
1068 name
= server
->name
.name_string
.val
[1];
1072 kdc_log(context
, config
, 0, "Searching referral for %s", name
);
1074 return _krb5_get_host_realm_int(context
, name
, FALSE
, realms
) == 0;
1077 static krb5_error_code
1078 tgs_parse_request(krb5_context context
,
1079 krb5_kdc_configuration
*config
,
1081 const PA_DATA
*tgs_req
,
1082 hdb_entry_ex
**krbtgt
,
1083 krb5_enctype
*krbtgt_etype
,
1084 krb5_ticket
**ticket
,
1085 const char **e_text
,
1087 const struct sockaddr
*from_addr
,
1090 AuthorizationData
**auth_data
,
1091 krb5_keyblock
**replykey
,
1095 krb5_error_code ret
;
1096 krb5_principal princ
;
1097 krb5_auth_context ac
= NULL
;
1098 krb5_flags ap_req_options
;
1099 krb5_flags verify_ap_req_flags
;
1102 krb5_keyblock
*subkey
= NULL
;
1110 memset(&ap_req
, 0, sizeof(ap_req
));
1111 ret
= krb5_decode_ap_req(context
, &tgs_req
->padata_value
, &ap_req
);
1113 const char *msg
= krb5_get_error_message(context
, ret
);
1114 kdc_log(context
, config
, 0, "Failed to decode AP-REQ: %s", msg
);
1115 krb5_free_error_message(context
, msg
);
1119 if(!get_krbtgt_realm(&ap_req
.ticket
.sname
)){
1120 /* XXX check for ticket.sname == req.sname */
1121 kdc_log(context
, config
, 0, "PA-DATA is not a ticket-granting ticket");
1122 ret
= KRB5KDC_ERR_POLICY
; /* ? */
1126 _krb5_principalname2krb5_principal(context
,
1128 ap_req
.ticket
.sname
,
1129 ap_req
.ticket
.realm
);
1131 ret
= _kdc_db_fetch(context
, config
, princ
, HDB_F_GET_KRBTGT
, NULL
, krbtgt
);
1134 const char *msg
= krb5_get_error_message(context
, ret
);
1136 ret
= krb5_unparse_name(context
, princ
, &p
);
1138 p
= "<unparse_name failed>";
1139 krb5_free_principal(context
, princ
);
1140 kdc_log(context
, config
, 0,
1141 "Ticket-granting ticket not found in database: %s", msg
);
1142 krb5_free_error_message(context
, msg
);
1145 ret
= KRB5KRB_AP_ERR_NOT_US
;
1149 if(ap_req
.ticket
.enc_part
.kvno
&&
1150 *ap_req
.ticket
.enc_part
.kvno
!= (*krbtgt
)->entry
.kvno
){
1153 ret
= krb5_unparse_name (context
, princ
, &p
);
1154 krb5_free_principal(context
, princ
);
1156 p
= "<unparse_name failed>";
1157 kdc_log(context
, config
, 0,
1158 "Ticket kvno = %d, DB kvno = %d (%s)",
1159 *ap_req
.ticket
.enc_part
.kvno
,
1160 (*krbtgt
)->entry
.kvno
,
1164 ret
= KRB5KRB_AP_ERR_BADKEYVER
;
1168 *krbtgt_etype
= ap_req
.ticket
.enc_part
.etype
;
1170 ret
= hdb_enctype2key(context
, &(*krbtgt
)->entry
,
1171 ap_req
.ticket
.enc_part
.etype
, &tkey
);
1173 char *str
= NULL
, *p
= NULL
;
1175 krb5_enctype_to_string(context
, ap_req
.ticket
.enc_part
.etype
, &str
);
1176 krb5_unparse_name(context
, princ
, &p
);
1177 kdc_log(context
, config
, 0,
1178 "No server key with enctype %s found for %s",
1179 str
? str
: "<unknown enctype>",
1180 p
? p
: "<unparse_name failed>");
1183 ret
= KRB5KRB_AP_ERR_BADKEYVER
;
1187 if (b
->kdc_options
.validate
)
1188 verify_ap_req_flags
= KRB5_VERIFY_AP_REQ_IGNORE_INVALID
;
1190 verify_ap_req_flags
= 0;
1192 ret
= krb5_verify_ap_req2(context
,
1197 verify_ap_req_flags
,
1200 KRB5_KU_TGS_REQ_AUTH
);
1202 krb5_free_principal(context
, princ
);
1204 const char *msg
= krb5_get_error_message(context
, ret
);
1205 kdc_log(context
, config
, 0, "Failed to verify AP-REQ: %s", msg
);
1206 krb5_free_error_message(context
, msg
);
1211 krb5_authenticator auth
;
1213 ret
= krb5_auth_con_getauthenticator(context
, ac
, &auth
);
1215 *csec
= malloc(sizeof(**csec
));
1216 if (*csec
== NULL
) {
1217 krb5_free_authenticator(context
, &auth
);
1218 kdc_log(context
, config
, 0, "malloc failed");
1221 **csec
= auth
->ctime
;
1222 *cusec
= malloc(sizeof(**cusec
));
1223 if (*cusec
== NULL
) {
1224 krb5_free_authenticator(context
, &auth
);
1225 kdc_log(context
, config
, 0, "malloc failed");
1228 **cusec
= auth
->cusec
;
1229 krb5_free_authenticator(context
, &auth
);
1233 ret
= tgs_check_authenticator(context
, config
,
1234 ac
, b
, e_text
, &(*ticket
)->ticket
.key
);
1236 krb5_auth_con_free(context
, ac
);
1240 usage
= KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY
;
1243 ret
= krb5_auth_con_getremotesubkey(context
, ac
, &subkey
);
1245 const char *msg
= krb5_get_error_message(context
, ret
);
1246 krb5_auth_con_free(context
, ac
);
1247 kdc_log(context
, config
, 0, "Failed to get remote subkey: %s", msg
);
1248 krb5_free_error_message(context
, msg
);
1252 usage
= KRB5_KU_TGS_REQ_AUTH_DAT_SESSION
;
1255 ret
= krb5_auth_con_getkey(context
, ac
, &subkey
);
1257 const char *msg
= krb5_get_error_message(context
, ret
);
1258 krb5_auth_con_free(context
, ac
);
1259 kdc_log(context
, config
, 0, "Failed to get session key: %s", msg
);
1260 krb5_free_error_message(context
, msg
);
1265 krb5_auth_con_free(context
, ac
);
1266 kdc_log(context
, config
, 0,
1267 "Failed to get key for enc-authorization-data");
1268 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1274 if (b
->enc_authorization_data
) {
1277 ret
= krb5_crypto_init(context
, subkey
, 0, &crypto
);
1279 const char *msg
= krb5_get_error_message(context
, ret
);
1280 krb5_auth_con_free(context
, ac
);
1281 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1282 krb5_free_error_message(context
, msg
);
1285 ret
= krb5_decrypt_EncryptedData (context
,
1288 b
->enc_authorization_data
,
1290 krb5_crypto_destroy(context
, crypto
);
1292 krb5_auth_con_free(context
, ac
);
1293 kdc_log(context
, config
, 0,
1294 "Failed to decrypt enc-authorization-data");
1295 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1299 if (*auth_data
== NULL
) {
1300 krb5_auth_con_free(context
, ac
);
1301 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1304 ret
= decode_AuthorizationData(ad
.data
, ad
.length
, *auth_data
, NULL
);
1306 krb5_auth_con_free(context
, ac
);
1309 kdc_log(context
, config
, 0, "Failed to decode authorization data");
1310 ret
= KRB5KRB_AP_ERR_BAD_INTEGRITY
; /* ? */
1315 krb5_auth_con_free(context
, ac
);
1318 free_AP_REQ(&ap_req
);
1323 static krb5_error_code
1324 build_server_referral(krb5_context context
,
1325 krb5_kdc_configuration
*config
,
1326 krb5_crypto session
,
1327 krb5_const_realm referred_realm
,
1328 const PrincipalName
*true_principal_name
,
1329 const PrincipalName
*requested_principal
,
1332 PA_ServerReferralData ref
;
1333 krb5_error_code ret
;
1338 memset(&ref
, 0, sizeof(ref
));
1340 if (referred_realm
) {
1341 ALLOC(ref
.referred_realm
);
1342 if (ref
.referred_realm
== NULL
)
1344 *ref
.referred_realm
= strdup(referred_realm
);
1345 if (*ref
.referred_realm
== NULL
)
1348 if (true_principal_name
) {
1349 ALLOC(ref
.true_principal_name
);
1350 if (ref
.true_principal_name
== NULL
)
1352 ret
= copy_PrincipalName(true_principal_name
, ref
.true_principal_name
);
1356 if (requested_principal
) {
1357 ALLOC(ref
.requested_principal_name
);
1358 if (ref
.requested_principal_name
== NULL
)
1360 ret
= copy_PrincipalName(requested_principal
,
1361 ref
.requested_principal_name
);
1366 ASN1_MALLOC_ENCODE(PA_ServerReferralData
,
1367 data
.data
, data
.length
,
1369 free_PA_ServerReferralData(&ref
);
1372 if (data
.length
!= size
)
1373 krb5_abortx(context
, "internal asn.1 encoder error");
1375 ret
= krb5_encrypt_EncryptedData(context
, session
,
1376 KRB5_KU_PA_SERVER_REFERRAL
,
1377 data
.data
, data
.length
,
1383 ASN1_MALLOC_ENCODE(EncryptedData
,
1384 outdata
->data
, outdata
->length
,
1386 free_EncryptedData(&ed
);
1389 if (outdata
->length
!= size
)
1390 krb5_abortx(context
, "internal asn.1 encoder error");
1394 free_PA_ServerReferralData(&ref
);
1395 krb5_set_error_message(context
, ENOMEM
, "malloc: out of memory");
1399 static krb5_error_code
1400 tgs_build_reply(krb5_context context
,
1401 krb5_kdc_configuration
*config
,
1404 hdb_entry_ex
*krbtgt
,
1405 krb5_enctype krbtgt_etype
,
1406 const krb5_keyblock
*replykey
,
1408 krb5_ticket
*ticket
,
1411 const char **e_text
,
1412 AuthorizationData
**auth_data
,
1413 const struct sockaddr
*from_addr
)
1415 krb5_error_code ret
;
1416 krb5_principal cp
= NULL
, sp
= NULL
;
1417 krb5_principal client_principal
= NULL
;
1418 char *spn
= NULL
, *cpn
= NULL
;
1419 hdb_entry_ex
*server
= NULL
, *client
= NULL
;
1421 krb5_realm ref_realm
= NULL
;
1422 EncTicketPart
*tgt
= &ticket
->ticket
;
1423 krb5_principals spp
= NULL
;
1424 const EncryptionKey
*ekey
;
1425 krb5_keyblock sessionkey
;
1429 METHOD_DATA enc_pa_data
;
1434 EncTicketPart adtkt
;
1440 memset(&sessionkey
, 0, sizeof(sessionkey
));
1441 memset(&adtkt
, 0, sizeof(adtkt
));
1442 krb5_data_zero(&rspac
);
1443 memset(&enc_pa_data
, 0, sizeof(enc_pa_data
));
1448 if(b
->kdc_options
.enc_tkt_in_skey
){
1454 if(b
->additional_tickets
== NULL
||
1455 b
->additional_tickets
->len
== 0){
1456 ret
= KRB5KDC_ERR_BADOPTION
; /* ? */
1457 kdc_log(context
, config
, 0,
1458 "No second ticket present in request");
1461 t
= &b
->additional_tickets
->val
[0];
1462 if(!get_krbtgt_realm(&t
->sname
)){
1463 kdc_log(context
, config
, 0,
1464 "Additional ticket is not a ticket-granting ticket");
1465 ret
= KRB5KDC_ERR_POLICY
;
1468 _krb5_principalname2krb5_principal(context
, &p
, t
->sname
, t
->realm
);
1469 ret
= _kdc_db_fetch(context
, config
, p
,
1470 HDB_F_GET_CLIENT
|HDB_F_GET_SERVER
,
1472 krb5_free_principal(context
, p
);
1474 if (ret
== HDB_ERR_NOENTRY
)
1475 ret
= KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
;
1478 ret
= hdb_enctype2key(context
, &uu
->entry
,
1479 t
->enc_part
.etype
, &uukey
);
1481 _kdc_free_ent(context
, uu
);
1482 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
; /* XXX */
1485 ret
= krb5_decrypt_ticket(context
, t
, &uukey
->key
, &adtkt
, 0);
1486 _kdc_free_ent(context
, uu
);
1490 ret
= verify_flags(context
, config
, &adtkt
, spn
);
1498 _krb5_principalname2krb5_principal(context
, &sp
, *s
, r
);
1499 ret
= krb5_unparse_name(context
, sp
, &spn
);
1502 _krb5_principalname2krb5_principal(context
, &cp
, tgt
->cname
, tgt
->crealm
);
1503 ret
= krb5_unparse_name(context
, cp
, &cpn
);
1506 unparse_flags (KDCOptions2int(b
->kdc_options
),
1507 asn1_KDCOptions_units(),
1508 opt_str
, sizeof(opt_str
));
1510 kdc_log(context
, config
, 0,
1511 "TGS-REQ %s from %s for %s [%s]",
1512 cpn
, from
, spn
, opt_str
);
1514 kdc_log(context
, config
, 0,
1515 "TGS-REQ %s from %s for %s", cpn
, from
, spn
);
1522 ret
= _kdc_db_fetch(context
, config
, sp
, HDB_F_GET_SERVER
| HDB_F_CANON
,
1526 const char *new_rlm
, *msg
;
1530 if ((req_rlm
= get_krbtgt_realm(&sp
->name
)) != NULL
) {
1532 new_rlm
= find_rpath(context
, tgt
->crealm
, req_rlm
);
1534 kdc_log(context
, config
, 5, "krbtgt for realm %s "
1535 "not found, trying %s",
1537 krb5_free_principal(context
, sp
);
1539 krb5_make_principal(context
, &sp
, r
,
1540 KRB5_TGS_NAME
, new_rlm
, NULL
);
1541 ret
= krb5_unparse_name(context
, sp
, &spn
);
1547 ref_realm
= strdup(new_rlm
);
1551 } else if(need_referral(context
, config
, &b
->kdc_options
, sp
, &realms
)) {
1552 if (strcmp(realms
[0], sp
->realm
) != 0) {
1553 kdc_log(context
, config
, 5,
1554 "Returning a referral to realm %s for "
1555 "server %s that was not found",
1557 krb5_free_principal(context
, sp
);
1559 krb5_make_principal(context
, &sp
, r
, KRB5_TGS_NAME
,
1561 ret
= krb5_unparse_name(context
, sp
, &spn
);
1567 ref_realm
= strdup(realms
[0]);
1569 krb5_free_host_realm(context
, realms
);
1572 krb5_free_host_realm(context
, realms
);
1574 msg
= krb5_get_error_message(context
, ret
);
1575 kdc_log(context
, config
, 0,
1576 "Server not found in database: %s: %s", spn
, msg
);
1577 krb5_free_error_message(context
, msg
);
1578 if (ret
== HDB_ERR_NOENTRY
)
1579 ret
= KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
;
1583 ret
= _kdc_db_fetch(context
, config
, cp
, HDB_F_GET_CLIENT
| HDB_F_CANON
,
1584 &clientdb
, &client
);
1586 const char *krbtgt_realm
, *msg
;
1589 * If the client belongs to the same realm as our krbtgt, it
1590 * should exist in the local database.
1595 krb5_principal_get_comp_string(context
,
1596 krbtgt
->entry
.principal
, 1);
1598 if(strcmp(krb5_principal_get_realm(context
, cp
), krbtgt_realm
) == 0) {
1599 if (ret
== HDB_ERR_NOENTRY
)
1600 ret
= KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN
;
1601 kdc_log(context
, config
, 1, "Client no longer in database: %s",
1606 msg
= krb5_get_error_message(context
, ret
);
1607 kdc_log(context
, config
, 1, "Client not found in database: %s", msg
);
1608 krb5_free_error_message(context
, msg
);
1612 * Select enctype, return key and kvno.
1618 if(b
->kdc_options
.enc_tkt_in_skey
) {
1621 for(i
= 0; i
< b
->etype
.len
; i
++)
1622 if (b
->etype
.val
[i
] == adtkt
.key
.keytype
)
1624 if(i
== b
->etype
.len
) {
1625 kdc_log(context
, config
, 0,
1626 "Addition ticket have not matching etypes");
1627 krb5_clear_error_message(context
);
1628 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
;
1631 etype
= b
->etype
.val
[i
];
1636 ret
= _kdc_find_etype(context
, server
,
1637 b
->etype
.val
, b
->etype
.len
, &skey
);
1639 kdc_log(context
, config
, 0,
1640 "Server (%s) has no support for etypes", spn
);
1644 etype
= skey
->key
.keytype
;
1645 kvno
= server
->entry
.kvno
;
1648 ret
= krb5_generate_random_keyblock(context
, etype
, &sessionkey
);
1654 * Check that service is in the same realm as the krbtgt. If it's
1655 * not the same, it's someone that is using a uni-directional trust
1659 if (strcmp(krb5_principal_get_realm(context
, sp
),
1660 krb5_principal_get_comp_string(context
,
1661 krbtgt
->entry
.principal
,
1664 ret
= krb5_unparse_name(context
, krbtgt
->entry
.principal
, &tpn
);
1665 kdc_log(context
, config
, 0,
1666 "Request with wrong krbtgt: %s",
1667 (ret
== 0) ? tpn
: "<unknown>");
1670 ret
= KRB5KRB_AP_ERR_NOT_US
;
1675 * Validate authoriation data
1678 ret
= hdb_enctype2key(context
, &krbtgt
->entry
,
1679 krbtgt_etype
, &tkey
);
1681 kdc_log(context
, config
, 0,
1682 "Failed to find key for krbtgt PAC check");
1686 ret
= check_PAC(context
, config
, cp
,
1687 client
, server
, ekey
, &tkey
->key
,
1688 tgt
, &rspac
, &signedpath
);
1690 const char *msg
= krb5_get_error_message(context
, ret
);
1691 kdc_log(context
, config
, 0,
1692 "Verify PAC failed for %s (%s) from %s with %s",
1693 spn
, cpn
, from
, msg
);
1694 krb5_free_error_message(context
, msg
);
1698 /* also check the krbtgt for signature */
1699 ret
= check_KRB5SignedPath(context
,
1707 const char *msg
= krb5_get_error_message(context
, ret
);
1708 kdc_log(context
, config
, 0,
1709 "KRB5SignedPath check failed for %s (%s) from %s with %s",
1710 spn
, cpn
, from
, msg
);
1711 krb5_free_error_message(context
, msg
);
1719 client_principal
= cp
;
1722 const PA_DATA
*sdata
;
1725 sdata
= _kdc_find_padata(req
, &i
, KRB5_PADATA_FOR_USER
);
1730 char *selfcpn
= NULL
;
1733 ret
= decode_PA_S4U2Self(sdata
->padata_value
.data
,
1734 sdata
->padata_value
.length
,
1737 kdc_log(context
, config
, 0, "Failed to decode PA-S4U2Self");
1741 ret
= _krb5_s4u2self_to_checksumdata(context
, &self
, &datack
);
1745 ret
= krb5_crypto_init(context
, &tgt
->key
, 0, &crypto
);
1747 const char *msg
= krb5_get_error_message(context
, ret
);
1748 free_PA_S4U2Self(&self
);
1749 krb5_data_free(&datack
);
1750 kdc_log(context
, config
, 0, "krb5_crypto_init failed: %s", msg
);
1751 krb5_free_error_message(context
, msg
);
1755 ret
= krb5_verify_checksum(context
,
1757 KRB5_KU_OTHER_CKSUM
,
1761 krb5_data_free(&datack
);
1762 krb5_crypto_destroy(context
, crypto
);
1764 const char *msg
= krb5_get_error_message(context
, ret
);
1765 free_PA_S4U2Self(&self
);
1766 kdc_log(context
, config
, 0,
1767 "krb5_verify_checksum failed for S4U2Self: %s", msg
);
1768 krb5_free_error_message(context
, msg
);
1772 ret
= _krb5_principalname2krb5_principal(context
,
1776 free_PA_S4U2Self(&self
);
1780 ret
= krb5_unparse_name(context
, client_principal
, &selfcpn
);
1785 * Check that service doing the impersonating is
1786 * requesting a ticket to it-self.
1788 if (krb5_principal_compare(context
, cp
, sp
) != TRUE
) {
1789 kdc_log(context
, config
, 0, "S4U2Self: %s is not allowed "
1790 "to impersonate some other user "
1791 "(tried for user %s to service %s)",
1794 ret
= KRB5KDC_ERR_BADOPTION
; /* ? */
1799 * If the service isn't trusted for authentication to
1800 * delegation, remove the forward flag.
1803 if (client
->entry
.flags
.trusted_for_delegation
) {
1804 str
= "[forwardable]";
1806 b
->kdc_options
.forwardable
= 0;
1809 kdc_log(context
, config
, 0, "s4u2self %s impersonating %s to "
1810 "service %s %s", cpn
, selfcpn
, spn
, str
);
1816 * Constrained delegation
1820 && b
->additional_tickets
!= NULL
1821 && b
->additional_tickets
->len
!= 0
1822 && b
->kdc_options
.enc_tkt_in_skey
== 0)
1824 int ad_signedpath
= 0;
1830 * Require that the KDC have issued the service's krbtgt (not
1831 * self-issued ticket with kimpersonate(1).
1834 ret
= KRB5KDC_ERR_BADOPTION
;
1835 kdc_log(context
, config
, 0,
1836 "Constrained delegation done on service ticket %s/%s",
1841 t
= &b
->additional_tickets
->val
[0];
1843 ret
= hdb_enctype2key(context
, &client
->entry
,
1844 t
->enc_part
.etype
, &clientkey
);
1846 ret
= KRB5KDC_ERR_ETYPE_NOSUPP
; /* XXX */
1850 ret
= krb5_decrypt_ticket(context
, t
, &clientkey
->key
, &adtkt
, 0);
1852 kdc_log(context
, config
, 0,
1853 "failed to decrypt ticket for "
1854 "constrained delegation from %s to %s ", cpn
, spn
);
1858 /* check that ticket is valid */
1859 if (adtkt
.flags
.forwardable
== 0) {
1860 kdc_log(context
, config
, 0,
1861 "Missing forwardable flag on ticket for "
1862 "constrained delegation from %s to %s ", cpn
, spn
);
1863 ret
= KRB5KDC_ERR_BADOPTION
;
1867 ret
= check_constrained_delegation(context
, config
, clientdb
,
1870 kdc_log(context
, config
, 0,
1871 "constrained delegation from %s to %s not allowed",
1876 ret
= _krb5_principalname2krb5_principal(context
,
1883 ret
= krb5_unparse_name(context
, client_principal
, &str
);
1887 ret
= verify_flags(context
, config
, &adtkt
, str
);
1894 * Check that the KDC issued the user's ticket.
1896 ret
= check_KRB5SignedPath(context
,
1903 if (ret
== 0 && !ad_signedpath
)
1904 ret
= KRB5KDC_ERR_BADOPTION
;
1906 const char *msg
= krb5_get_error_message(context
, ret
);
1907 kdc_log(context
, config
, 0,
1908 "KRB5SignedPath check from service %s failed "
1909 "for delegation to %s for client %s "
1910 "from %s failed with %s",
1911 spn
, str
, cpn
, from
, msg
);
1912 krb5_free_error_message(context
, msg
);
1917 kdc_log(context
, config
, 0, "constrained delegation for %s "
1918 "from %s to %s", str
, cpn
, spn
);
1926 ret
= kdc_check_flags(context
, config
,
1933 if((b
->kdc_options
.validate
|| b
->kdc_options
.renew
) &&
1934 !krb5_principal_compare(context
,
1935 krbtgt
->entry
.principal
,
1936 server
->entry
.principal
)){
1937 kdc_log(context
, config
, 0, "Inconsistent request.");
1938 ret
= KRB5KDC_ERR_SERVER_NOMATCH
;
1942 /* check for valid set of addresses */
1943 if(!_kdc_check_addresses(context
, config
, tgt
->caddr
, from_addr
)) {
1944 ret
= KRB5KRB_AP_ERR_BADADDR
;
1945 kdc_log(context
, config
, 0, "Request from wrong address");
1950 * If this is an referral, add server referral data to the
1957 kdc_log(context
, config
, 0,
1958 "Adding server referral to %s", ref_realm
);
1960 ret
= krb5_crypto_init(context
, &sessionkey
, 0, &crypto
);
1964 ret
= build_server_referral(context
, config
, crypto
, ref_realm
,
1965 NULL
, s
, &pa
.padata_value
);
1966 krb5_crypto_destroy(context
, crypto
);
1968 kdc_log(context
, config
, 0,
1969 "Failed building server referral");
1972 pa
.padata_type
= KRB5_PADATA_SERVER_REFERRAL
;
1974 ret
= add_METHOD_DATA(&enc_pa_data
, &pa
);
1975 krb5_data_free(&pa
.padata_value
);
1977 kdc_log(context
, config
, 0,
1978 "Add server referral METHOD-DATA failed");
1987 ret
= tgs_make_reply(context
,
2015 krb5_data_free(&rspac
);
2016 krb5_free_keyblock_contents(context
, &sessionkey
);
2018 _kdc_free_ent(context
, server
);
2020 _kdc_free_ent(context
, client
);
2022 if (client_principal
&& client_principal
!= cp
)
2023 krb5_free_principal(context
, client_principal
);
2025 krb5_free_principal(context
, cp
);
2027 krb5_free_principal(context
, sp
);
2030 free_METHOD_DATA(&enc_pa_data
);
2032 free_EncTicketPart(&adtkt
);
2042 _kdc_tgs_rep(krb5_context context
,
2043 krb5_kdc_configuration
*config
,
2047 struct sockaddr
*from_addr
,
2050 AuthorizationData
*auth_data
= NULL
;
2051 krb5_error_code ret
;
2053 const PA_DATA
*tgs_req
;
2055 hdb_entry_ex
*krbtgt
= NULL
;
2056 krb5_ticket
*ticket
= NULL
;
2057 const char *e_text
= NULL
;
2058 krb5_enctype krbtgt_etype
= ETYPE_NULL
;
2060 krb5_keyblock
*replykey
= NULL
;
2061 int rk_is_subkey
= 0;
2062 time_t *csec
= NULL
;
2065 if(req
->padata
== NULL
){
2066 ret
= KRB5KDC_ERR_PREAUTH_REQUIRED
; /* XXX ??? */
2067 kdc_log(context
, config
, 0,
2068 "TGS-REQ from %s without PA-DATA", from
);
2072 tgs_req
= _kdc_find_padata(req
, &i
, KRB5_PADATA_TGS_REQ
);
2074 if(tgs_req
== NULL
){
2075 ret
= KRB5KDC_ERR_PADATA_TYPE_NOSUPP
;
2077 kdc_log(context
, config
, 0,
2078 "TGS-REQ from %s without PA-TGS-REQ", from
);
2081 ret
= tgs_parse_request(context
, config
,
2082 &req
->req_body
, tgs_req
,
2093 kdc_log(context
, config
, 0,
2094 "Failed parsing TGS-REQ from %s", from
);
2098 ret
= tgs_build_reply(context
,
2113 kdc_log(context
, config
, 0,
2114 "Failed building TGS-REP to %s", from
);
2119 if (datagram_reply
&& data
->length
> config
->max_datagram_reply_length
) {
2120 krb5_data_free(data
);
2121 ret
= KRB5KRB_ERR_RESPONSE_TOO_BIG
;
2122 e_text
= "Reply packet too large";
2127 krb5_free_keyblock(context
, replykey
);
2128 if(ret
&& data
->data
== NULL
){
2129 krb5_mk_error(context
,
2142 krb5_free_ticket(context
, ticket
);
2144 _kdc_free_ent(context
, krbtgt
);
2147 free_AuthorizationData(auth_data
);