2 * Copyright (c) 1997 - 2002 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
34 #include "krb5_locl.h"
39 krb5_init_etype (krb5_context context
,
42 const krb5_enctype
*etypes
)
46 krb5_enctype
*tmp
= NULL
;
50 ret
= krb5_get_default_in_tkt_etypes(context
,
57 for (i
= 0; etypes
[i
]; ++i
)
60 *val
= malloc(i
* sizeof(**val
));
61 if (i
!= 0 && *val
== NULL
) {
63 krb5_set_error_string(context
, "malloc: out of memory");
76 static krb5_error_code
77 decrypt_tkt (krb5_context context
,
80 krb5_const_pointer decrypt_arg
,
81 krb5_kdc_rep
*dec_rep
)
88 ret
= krb5_crypto_init(context
, key
, 0, &crypto
);
92 ret
= krb5_decrypt_EncryptedData (context
,
95 &dec_rep
->kdc_rep
.enc_part
,
97 krb5_crypto_destroy(context
, crypto
);
102 ret
= krb5_decode_EncASRepPart(context
,
108 ret
= krb5_decode_EncTGSRepPart(context
,
113 krb5_data_free (&data
);
120 _krb5_extract_ticket(krb5_context context
,
124 krb5_const_pointer keyseed
,
125 krb5_key_usage key_usage
,
126 krb5_addresses
*addrs
,
128 krb5_boolean allow_server_mismatch
,
129 krb5_boolean ignore_cname
,
130 krb5_decrypt_proc decrypt_proc
,
131 krb5_const_pointer decryptarg
)
134 krb5_principal tmp_principal
;
137 krb5_timestamp sec_now
;
139 ret
= principalname2krb5_principal (&tmp_principal
,
141 rep
->kdc_rep
.crealm
);
148 tmp
= krb5_principal_compare (context
, tmp_principal
, creds
->client
);
150 krb5_free_principal (context
, tmp_principal
);
151 krb5_clear_error_string (context
);
152 ret
= KRB5KRB_AP_ERR_MODIFIED
;
157 krb5_free_principal (context
, creds
->client
);
158 creds
->client
= tmp_principal
;
161 ASN1_MALLOC_ENCODE(Ticket
, creds
->ticket
.data
, creds
->ticket
.length
,
162 &rep
->kdc_rep
.ticket
, &creds
->ticket
.length
, ret
);
165 creds
->second_ticket
.length
= 0;
166 creds
->second_ticket
.data
= NULL
;
170 ret
= principalname2krb5_principal (&tmp_principal
,
171 rep
->kdc_rep
.ticket
.sname
,
172 rep
->kdc_rep
.ticket
.realm
);
175 if(allow_server_mismatch
){
176 krb5_free_principal(context
, creds
->server
);
177 creds
->server
= tmp_principal
;
178 tmp_principal
= NULL
;
180 tmp
= krb5_principal_compare (context
, tmp_principal
, creds
->server
);
181 krb5_free_principal (context
, tmp_principal
);
183 ret
= KRB5KRB_AP_ERR_MODIFIED
;
184 krb5_clear_error_string (context
);
191 if (decrypt_proc
== NULL
)
192 decrypt_proc
= decrypt_tkt
;
194 ret
= (*decrypt_proc
)(context
, key
, key_usage
, decryptarg
, rep
);
199 /* XXX should this decode be here, or in the decrypt_proc? */
200 ret
= krb5_decode_keyblock(context
, &rep
->enc_part
.key
, 1);
207 if (nonce
!= rep
->enc_part
.nonce
) {
208 ret
= KRB5KRB_AP_ERR_MODIFIED
;
209 krb5_set_error_string(context
, "malloc: out of memory");
215 krb5_timeofday (context
, &sec_now
);
216 if (rep
->enc_part
.flags
.initial
217 && context
->kdc_sec_offset
== 0
218 && krb5_config_get_bool (context
, NULL
,
222 context
->kdc_sec_offset
= rep
->enc_part
.authtime
- sec_now
;
223 krb5_timeofday (context
, &sec_now
);
226 /* check all times */
228 if (rep
->enc_part
.starttime
) {
229 tmp_time
= *rep
->enc_part
.starttime
;
231 tmp_time
= rep
->enc_part
.authtime
;
233 if (creds
->times
.starttime
== 0
234 && abs(tmp_time
- sec_now
) > context
->max_skew
) {
235 ret
= KRB5KRB_AP_ERR_SKEW
;
236 krb5_set_error_string (context
,
237 "time skew (%d) larger than max (%d)",
238 abs(tmp_time
- sec_now
),
239 (int)context
->max_skew
);
243 if (creds
->times
.starttime
!= 0
244 && tmp_time
!= creds
->times
.starttime
) {
245 krb5_clear_error_string (context
);
246 ret
= KRB5KRB_AP_ERR_MODIFIED
;
250 creds
->times
.starttime
= tmp_time
;
252 if (rep
->enc_part
.renew_till
) {
253 tmp_time
= *rep
->enc_part
.renew_till
;
257 if (creds
->times
.renew_till
!= 0
258 && tmp_time
> creds
->times
.renew_till
) {
259 krb5_clear_error_string (context
);
260 ret
= KRB5KRB_AP_ERR_MODIFIED
;
264 creds
->times
.renew_till
= tmp_time
;
266 creds
->times
.authtime
= rep
->enc_part
.authtime
;
268 if (creds
->times
.endtime
!= 0
269 && rep
->enc_part
.endtime
> creds
->times
.endtime
) {
270 krb5_clear_error_string (context
);
271 ret
= KRB5KRB_AP_ERR_MODIFIED
;
275 creds
->times
.endtime
= rep
->enc_part
.endtime
;
277 if(rep
->enc_part
.caddr
)
278 krb5_copy_addresses (context
, rep
->enc_part
.caddr
, &creds
->addresses
);
280 krb5_copy_addresses (context
, addrs
, &creds
->addresses
);
282 creds
->addresses
.len
= 0;
283 creds
->addresses
.val
= NULL
;
285 creds
->flags
.b
= rep
->enc_part
.flags
;
287 creds
->authdata
.len
= 0;
288 creds
->authdata
.val
= NULL
;
289 creds
->session
.keyvalue
.length
= 0;
290 creds
->session
.keyvalue
.data
= NULL
;
291 creds
->session
.keytype
= rep
->enc_part
.key
.keytype
;
292 ret
= krb5_data_copy (&creds
->session
.keyvalue
,
293 rep
->enc_part
.key
.keyvalue
.data
,
294 rep
->enc_part
.key
.keyvalue
.length
);
297 memset (rep
->enc_part
.key
.keyvalue
.data
, 0,
298 rep
->enc_part
.key
.keyvalue
.length
);
303 static krb5_error_code
304 make_pa_enc_timestamp(krb5_context context
, PA_DATA
*pa
,
305 krb5_enctype etype
, krb5_keyblock
*key
)
311 EncryptedData encdata
;
317 krb5_us_timeofday (context
, &sec
, &usec
);
322 ASN1_MALLOC_ENCODE(PA_ENC_TS_ENC
, buf
, buf_size
, &p
, &len
, ret
);
326 krb5_abortx(context
, "internal error in ASN.1 encoder");
327 ret
= krb5_crypto_init(context
, key
, 0, &crypto
);
332 ret
= krb5_encrypt_EncryptedData(context
,
334 KRB5_KU_PA_ENC_TIMESTAMP
,
340 krb5_crypto_destroy(context
, crypto
);
344 ASN1_MALLOC_ENCODE(EncryptedData
, buf
, buf_size
, &encdata
, &len
, ret
);
345 free_EncryptedData(&encdata
);
349 krb5_abortx(context
, "internal error in ASN.1 encoder");
350 pa
->padata_type
= KRB5_PADATA_ENC_TIMESTAMP
;
351 pa
->padata_value
.length
= len
;
352 pa
->padata_value
.data
= buf
;
356 static krb5_error_code
357 add_padata(krb5_context context
,
359 krb5_principal client
,
360 krb5_key_proc key_proc
,
361 krb5_const_pointer keyseed
,
362 krb5_enctype
*enctypes
,
373 /* default to standard salt */
374 ret
= krb5_get_pw_salt (context
, client
, &salt2
);
378 enctypes
= context
->etypes
;
380 for (ep
= enctypes
; *ep
!= ETYPE_NULL
; ep
++)
383 pa2
= realloc (md
->val
, (md
->len
+ netypes
) * sizeof(*md
->val
));
385 krb5_set_error_string(context
, "malloc: out of memory");
390 for (i
= 0; i
< netypes
; ++i
) {
393 ret
= (*key_proc
)(context
, enctypes
[i
], *salt
, keyseed
, &key
);
396 ret
= make_pa_enc_timestamp (context
, &md
->val
[md
->len
],
398 krb5_free_keyblock (context
, key
);
404 krb5_free_salt(context
, salt2
);
408 static krb5_error_code
409 init_as_req (krb5_context context
,
412 const krb5_addresses
*addrs
,
413 const krb5_enctype
*etypes
,
414 const krb5_preauthtype
*ptypes
,
415 const krb5_preauthdata
*preauth
,
416 krb5_key_proc key_proc
,
417 krb5_const_pointer keyseed
,
424 memset(a
, 0, sizeof(*a
));
427 a
->msg_type
= krb_as_req
;
428 a
->req_body
.kdc_options
= opts
.b
;
429 a
->req_body
.cname
= malloc(sizeof(*a
->req_body
.cname
));
430 if (a
->req_body
.cname
== NULL
) {
432 krb5_set_error_string(context
, "malloc: out of memory");
435 a
->req_body
.sname
= malloc(sizeof(*a
->req_body
.sname
));
436 if (a
->req_body
.sname
== NULL
) {
438 krb5_set_error_string(context
, "malloc: out of memory");
441 ret
= krb5_principal2principalname (a
->req_body
.cname
, creds
->client
);
444 ret
= krb5_principal2principalname (a
->req_body
.sname
, creds
->server
);
447 ret
= copy_Realm(&creds
->client
->realm
, &a
->req_body
.realm
);
451 if(creds
->times
.starttime
) {
452 a
->req_body
.from
= malloc(sizeof(*a
->req_body
.from
));
453 if (a
->req_body
.from
== NULL
) {
455 krb5_set_error_string(context
, "malloc: out of memory");
458 *a
->req_body
.from
= creds
->times
.starttime
;
460 if(creds
->times
.endtime
){
461 ALLOC(a
->req_body
.till
, 1);
462 *a
->req_body
.till
= creds
->times
.endtime
;
464 if(creds
->times
.renew_till
){
465 a
->req_body
.rtime
= malloc(sizeof(*a
->req_body
.rtime
));
466 if (a
->req_body
.rtime
== NULL
) {
468 krb5_set_error_string(context
, "malloc: out of memory");
471 *a
->req_body
.rtime
= creds
->times
.renew_till
;
473 a
->req_body
.nonce
= nonce
;
474 ret
= krb5_init_etype (context
,
475 &a
->req_body
.etype
.len
,
476 &a
->req_body
.etype
.val
,
482 * This means no addresses
485 if (addrs
&& addrs
->len
== 0) {
486 a
->req_body
.addresses
= NULL
;
488 a
->req_body
.addresses
= malloc(sizeof(*a
->req_body
.addresses
));
489 if (a
->req_body
.addresses
== NULL
) {
491 krb5_set_error_string(context
, "malloc: out of memory");
496 ret
= krb5_copy_addresses(context
, addrs
, a
->req_body
.addresses
);
498 ret
= krb5_get_all_client_addrs (context
, a
->req_body
.addresses
);
499 if(ret
== 0 && a
->req_body
.addresses
->len
== 0) {
500 free(a
->req_body
.addresses
);
501 a
->req_body
.addresses
= NULL
;
508 a
->req_body
.enc_authorization_data
= NULL
;
509 a
->req_body
.additional_tickets
= NULL
;
511 if(preauth
!= NULL
) {
514 if(a
->padata
== NULL
) {
516 krb5_set_error_string(context
, "malloc: out of memory");
519 for(i
= 0; i
< preauth
->len
; i
++) {
520 if(preauth
->val
[i
].type
== KRB5_PADATA_ENC_TIMESTAMP
){
522 PA_DATA
*tmp
= realloc(a
->padata
->val
,
524 preauth
->val
[i
].info
.len
) *
525 sizeof(*a
->padata
->val
));
528 krb5_set_error_string(context
, "malloc: out of memory");
531 a
->padata
->val
= tmp
;
532 for(j
= 0; j
< preauth
->val
[i
].info
.len
; j
++) {
533 krb5_salt
*sp
= &salt
;
534 if(preauth
->val
[i
].info
.val
[j
].salttype
)
535 salt
.salttype
= *preauth
->val
[i
].info
.val
[j
].salttype
;
537 salt
.salttype
= KRB5_PW_SALT
;
538 if(preauth
->val
[i
].info
.val
[j
].salt
)
539 salt
.saltvalue
= *preauth
->val
[i
].info
.val
[j
].salt
;
541 if(salt
.salttype
== KRB5_PW_SALT
)
544 krb5_data_zero(&salt
.saltvalue
);
545 ret
= add_padata(context
, a
->padata
, creds
->client
,
547 &preauth
->val
[i
].info
.val
[j
].etype
, 1,
555 /* not sure this is the way to use `ptypes' */
556 if (ptypes
== NULL
|| *ptypes
== KRB5_PADATA_NONE
)
558 else if (*ptypes
== KRB5_PADATA_ENC_TIMESTAMP
) {
560 if (a
->padata
== NULL
) {
562 krb5_set_error_string(context
, "malloc: out of memory");
566 a
->padata
->val
= NULL
;
568 /* make a v5 salted pa-data */
569 add_padata(context
, a
->padata
, creds
->client
,
570 key_proc
, keyseed
, a
->req_body
.etype
.val
,
571 a
->req_body
.etype
.len
, NULL
);
573 /* make a v4 salted pa-data */
574 salt
.salttype
= KRB5_PW_SALT
;
575 krb5_data_zero(&salt
.saltvalue
);
576 add_padata(context
, a
->padata
, creds
->client
,
577 key_proc
, keyseed
, a
->req_body
.etype
.val
,
578 a
->req_body
.etype
.len
, &salt
);
580 krb5_set_error_string (context
, "pre-auth type %d not supported",
582 ret
= KRB5_PREAUTH_BAD_TYPE
;
592 set_ptypes(krb5_context context
,
594 krb5_preauthtype
**ptypes
,
595 krb5_preauthdata
**preauth
)
597 static krb5_preauthdata preauth2
;
598 static krb5_preauthtype ptypes2
[] = { KRB5_PADATA_ENC_TIMESTAMP
, KRB5_PADATA_NONE
};
603 decode_METHOD_DATA(error
->e_data
->data
,
604 error
->e_data
->length
,
607 for(i
= 0; i
< md
.len
; i
++){
608 switch(md
.val
[i
].padata_type
){
609 case KRB5_PADATA_ENC_TIMESTAMP
:
612 case KRB5_PADATA_ETYPE_INFO
:
613 *preauth
= &preauth2
;
614 ALLOC_SEQ(*preauth
, 1);
615 (*preauth
)->val
[0].type
= KRB5_PADATA_ENC_TIMESTAMP
;
616 krb5_decode_ETYPE_INFO(context
,
617 md
.val
[i
].padata_value
.data
,
618 md
.val
[i
].padata_value
.length
,
619 &(*preauth
)->val
[0].info
,
626 free_METHOD_DATA(&md
);
634 krb5_get_in_cred(krb5_context context
,
636 const krb5_addresses
*addrs
,
637 const krb5_enctype
*etypes
,
638 const krb5_preauthtype
*ptypes
,
639 const krb5_preauthdata
*preauth
,
640 krb5_key_proc key_proc
,
641 krb5_const_pointer keyseed
,
642 krb5_decrypt_proc decrypt_proc
,
643 krb5_const_pointer decryptarg
,
645 krb5_kdc_rep
*ret_as_reply
)
658 krb5_preauthdata
*my_preauth
= NULL
;
664 krb5_generate_random_block (&nonce
, sizeof(nonce
));
669 ret
= init_as_req (context
,
681 free_ETYPE_INFO(&my_preauth
->val
[0].info
);
682 free (my_preauth
->val
);
687 ASN1_MALLOC_ENCODE(AS_REQ
, req
.data
, req
.length
, &a
, &len
, ret
);
691 if(len
!= req
.length
)
692 krb5_abortx(context
, "internal error in ASN.1 encoder");
694 ret
= krb5_sendto_kdc (context
, &req
, &creds
->client
->realm
, &resp
);
695 krb5_data_free(&req
);
699 memset (&rep
, 0, sizeof(rep
));
700 ret
= decode_AS_REP(resp
.data
, resp
.length
, &rep
.kdc_rep
, &size
);
702 /* let's try to parse it as a KRB-ERROR */
706 ret2
= krb5_rd_error(context
, &resp
, &error
);
707 if(ret2
&& resp
.data
&& ((char*)resp
.data
)[0] == 4)
708 ret
= KRB5KRB_AP_ERR_V4_REPLY
;
709 krb5_data_free(&resp
);
711 ret
= krb5_error_from_rd_error(context
, &error
, creds
);
712 /* if no preauth was set and KDC requires it, give it
714 if (!ptypes
&& !preauth
715 && ret
== KRB5KDC_ERR_PREAUTH_REQUIRED
717 || ret
== KRB5KDC_ERR_BADOPTION
719 && set_ptypes(context
, &error
, &ptypes
, &my_preauth
)) {
721 preauth
= my_preauth
;
722 krb5_free_error_contents(context
, &error
);
723 krb5_clear_error_string(context
);
727 ret_as_reply
->error
= error
;
729 free_KRB_ERROR (&error
);
734 krb5_data_free(&resp
);
738 etype
= rep
.kdc_rep
.enc_part
.etype
;
739 if(rep
.kdc_rep
.padata
){
741 pa
= krb5_find_padata(rep
.kdc_rep
.padata
->val
, rep
.kdc_rep
.padata
->len
,
742 KRB5_PADATA_PW_SALT
, &index
);
745 pa
= krb5_find_padata(rep
.kdc_rep
.padata
->val
,
746 rep
.kdc_rep
.padata
->len
,
747 KRB5_PADATA_AFS3_SALT
, &index
);
751 salt
.salttype
= pa
->padata_type
;
752 salt
.saltvalue
= pa
->padata_value
;
754 ret
= (*key_proc
)(context
, etype
, salt
, keyseed
, &key
);
756 /* make a v5 salted pa-data */
757 ret
= krb5_get_pw_salt (context
, creds
->client
, &salt
);
761 ret
= (*key_proc
)(context
, etype
, salt
, keyseed
, &key
);
762 krb5_free_salt(context
, salt
);
767 ret
= _krb5_extract_ticket(context
,
772 KRB5_KU_AS_REP_ENC_PART
,
776 opts
.b
.request_anonymous
,
779 memset (key
->keyvalue
.data
, 0, key
->keyvalue
.length
);
780 krb5_free_keyblock_contents (context
, key
);
784 if (ret
== 0 && ret_as_reply
)
787 krb5_free_kdc_rep (context
, &rep
);
792 krb5_get_in_tkt(krb5_context context
,
794 const krb5_addresses
*addrs
,
795 const krb5_enctype
*etypes
,
796 const krb5_preauthtype
*ptypes
,
797 krb5_key_proc key_proc
,
798 krb5_const_pointer keyseed
,
799 krb5_decrypt_proc decrypt_proc
,
800 krb5_const_pointer decryptarg
,
803 krb5_kdc_rep
*ret_as_reply
)
808 opts
.b
= int2KDCOptions(options
);
810 ret
= krb5_get_in_cred (context
,
824 ret
= krb5_cc_store_cred (context
, ccache
, creds
);
825 krb5_free_creds_contents (context
, creds
);