2
* Copyright (c) 1997 - 2007 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>
38
static krb5_error_code
39
decrypt_tkt_enc_part (krb5_context context,
41
EncryptedData *enc_part,
42
EncTicketPart *decr_part)
49
ret = krb5_crypto_init(context, key, 0, &crypto);
52
ret = krb5_decrypt_EncryptedData (context,
57
krb5_crypto_destroy(context, crypto);
61
ret = krb5_decode_EncTicketPart(context, plain.data, plain.length,
63
krb5_data_free (&plain);
67
static krb5_error_code
68
decrypt_authenticator (krb5_context context,
70
EncryptedData *enc_part,
71
Authenticator *authenticator,
79
ret = krb5_crypto_init(context, key, 0, &crypto);
82
ret = krb5_decrypt_EncryptedData (context,
84
usage /* KRB5_KU_AP_REQ_AUTH */,
87
/* for backwards compatibility, also try the old usage */
88
if (ret && usage == KRB5_KU_TGS_REQ_AUTH)
89
ret = krb5_decrypt_EncryptedData (context,
94
krb5_crypto_destroy(context, crypto);
98
ret = krb5_decode_Authenticator(context, plain.data, plain.length,
100
krb5_data_free (&plain);
104
krb5_error_code KRB5_LIB_FUNCTION
105
krb5_decode_ap_req(krb5_context context,
106
const krb5_data *inbuf,
111
ret = decode_AP_REQ(inbuf->data, inbuf->length, ap_req, &len);
114
if (ap_req->pvno != 5){
116
krb5_clear_error_message (context);
117
return KRB5KRB_AP_ERR_BADVERSION;
119
if (ap_req->msg_type != krb_ap_req){
121
krb5_clear_error_message (context);
122
return KRB5KRB_AP_ERR_MSG_TYPE;
124
if (ap_req->ticket.tkt_vno != 5){
126
krb5_clear_error_message (context);
127
return KRB5KRB_AP_ERR_BADVERSION;
132
static krb5_error_code
133
check_transited(krb5_context context, Ticket *ticket, EncTicketPart *enc)
136
unsigned int num_realms;
140
* Windows 2000 and 2003 uses this inside their TGT so it's normaly
141
* not seen by others, however, samba4 joined with a Windows AD as
142
* a Domain Controller gets exposed to this.
144
if(enc->transited.tr_type == 0 && enc->transited.contents.length == 0)
147
if(enc->transited.tr_type != DOMAIN_X500_COMPRESS)
148
return KRB5KDC_ERR_TRTYPE_NOSUPP;
150
if(enc->transited.contents.length == 0)
153
ret = krb5_domain_x500_decode(context, enc->transited.contents,
154
&realms, &num_realms,
159
ret = krb5_check_transited(context, enc->crealm,
161
realms, num_realms, NULL);
166
static krb5_error_code
167
find_etypelist(krb5_context context,
168
krb5_auth_context auth_context,
173
krb5_authdata adIfRelevant;
176
adIfRelevant.len = 0;
181
ad = auth_context->authenticator->authorization_data;
185
for (i = 0; i < ad->len; i++) {
186
if (ad->val[i].ad_type == KRB5_AUTHDATA_IF_RELEVANT) {
187
ret = decode_AD_IF_RELEVANT(ad->val[i].ad_data.data,
188
ad->val[i].ad_data.length,
194
if (adIfRelevant.len == 1 &&
195
adIfRelevant.val[0].ad_type ==
196
KRB5_AUTHDATA_GSS_API_ETYPE_NEGOTIATION) {
199
free_AD_IF_RELEVANT(&adIfRelevant);
200
adIfRelevant.len = 0;
204
if (adIfRelevant.len == 0)
207
ret = decode_EtypeList(adIfRelevant.val[0].ad_data.data,
208
adIfRelevant.val[0].ad_data.length,
212
krb5_clear_error_message(context);
214
free_AD_IF_RELEVANT(&adIfRelevant);
219
krb5_error_code KRB5_LIB_FUNCTION
220
krb5_decrypt_ticket(krb5_context context,
228
ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
234
time_t start = t.authtime;
236
krb5_timeofday (context, &now);
238
start = *t.starttime;
239
if(start - now > context->max_skew
241
&& !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
242
free_EncTicketPart(&t);
243
krb5_clear_error_message (context);
244
return KRB5KRB_AP_ERR_TKT_NYV;
246
if(now - t.endtime > context->max_skew) {
247
free_EncTicketPart(&t);
248
krb5_clear_error_message (context);
249
return KRB5KRB_AP_ERR_TKT_EXPIRED;
252
if(!t.flags.transited_policy_checked) {
253
ret = check_transited(context, ticket, &t);
255
free_EncTicketPart(&t);
264
free_EncTicketPart(&t);
268
krb5_error_code KRB5_LIB_FUNCTION
269
krb5_verify_authenticator_checksum(krb5_context context,
270
krb5_auth_context ac,
276
krb5_authenticator authenticator;
279
ret = krb5_auth_con_getauthenticator (context,
284
if(authenticator->cksum == NULL) {
285
krb5_free_authenticator(context, &authenticator);
288
ret = krb5_auth_con_getkey(context, ac, &key);
290
krb5_free_authenticator(context, &authenticator);
293
ret = krb5_crypto_init(context, key, 0, &crypto);
296
ret = krb5_verify_checksum (context,
298
KRB5_KU_AP_REQ_AUTH_CKSUM,
301
authenticator->cksum);
302
krb5_crypto_destroy(context, crypto);
304
krb5_free_authenticator(context, &authenticator);
305
krb5_free_keyblock(context, key);
310
krb5_error_code KRB5_LIB_FUNCTION
311
krb5_verify_ap_req(krb5_context context,
312
krb5_auth_context *auth_context,
314
krb5_const_principal server,
315
krb5_keyblock *keyblock,
317
krb5_flags *ap_req_options,
318
krb5_ticket **ticket)
320
return krb5_verify_ap_req2 (context,
328
KRB5_KU_AP_REQ_AUTH);
331
krb5_error_code KRB5_LIB_FUNCTION
332
krb5_verify_ap_req2(krb5_context context,
333
krb5_auth_context *auth_context,
335
krb5_const_principal server,
336
krb5_keyblock *keyblock,
338
krb5_flags *ap_req_options,
339
krb5_ticket **ticket,
340
krb5_key_usage usage)
343
krb5_auth_context ac;
350
if (auth_context && *auth_context) {
353
ret = krb5_auth_con_init (context, &ac);
358
t = calloc(1, sizeof(*t));
361
krb5_clear_error_message (context);
365
if (ap_req->ap_options.use_session_key && ac->keyblock){
366
ret = krb5_decrypt_ticket(context, &ap_req->ticket,
370
krb5_free_keyblock(context, ac->keyblock);
373
ret = krb5_decrypt_ticket(context, &ap_req->ticket,
381
ret = _krb5_principalname2krb5_principal(context,
383
ap_req->ticket.sname,
384
ap_req->ticket.realm);
386
ret = _krb5_principalname2krb5_principal(context,
392
ret = decrypt_authenticator (context,
394
&ap_req->authenticator,
401
krb5_principal p1, p2;
404
_krb5_principalname2krb5_principal(context,
406
ac->authenticator->cname,
407
ac->authenticator->crealm);
408
_krb5_principalname2krb5_principal(context,
412
res = krb5_principal_compare (context, p1, p2);
413
krb5_free_principal (context, p1);
414
krb5_free_principal (context, p2);
416
ret = KRB5KRB_AP_ERR_BADMATCH;
417
krb5_clear_error_message (context);
422
/* check addresses */
425
&& ac->remote_address
426
&& !krb5_address_search (context,
429
ret = KRB5KRB_AP_ERR_BADADDR;
430
krb5_clear_error_message (context);
434
/* check timestamp in authenticator */
438
krb5_timeofday (context, &now);
440
if (abs(ac->authenticator->ctime - now) > context->max_skew) {
441
ret = KRB5KRB_AP_ERR_SKEW;
442
krb5_clear_error_message (context);
447
if (ac->authenticator->seq_number)
448
krb5_auth_con_setremoteseqnumber(context, ac,
449
*ac->authenticator->seq_number);
451
/* XXX - Xor sequence numbers */
453
if (ac->authenticator->subkey) {
454
ret = krb5_auth_con_setremotesubkey(context, ac,
455
ac->authenticator->subkey);
460
ret = find_etypelist(context, ac, &etypes);
464
ac->keytype = ETYPE_NULL;
469
for (i = 0; i < etypes.len; i++) {
470
if (krb5_enctype_valid(context, etypes.val[i]) == 0) {
471
ac->keytype = etypes.val[i];
478
ret = krb5_copy_keyblock(context, &t->ticket.key, &ac->keyblock);
481
if (ap_req_options) {
483
if (ac->keytype != ETYPE_NULL)
484
*ap_req_options |= AP_OPTS_USE_SUBKEY;
485
if (ap_req->ap_options.use_session_key)
486
*ap_req_options |= AP_OPTS_USE_SESSION_KEY;
487
if (ap_req->ap_options.mutual_required)
488
*ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
494
krb5_free_ticket (context, t);
496
if (*auth_context == NULL)
499
krb5_auth_con_free (context, ac);
500
free_EtypeList(&etypes);
504
krb5_free_ticket (context, t);
505
if (auth_context == NULL || *auth_context == NULL)
506
krb5_auth_con_free (context, ac);
514
struct krb5_rd_req_in_ctx_data {
516
krb5_keyblock *keyblock;
517
krb5_boolean check_pac;
520
struct krb5_rd_req_out_ctx_data {
521
krb5_keyblock *keyblock;
522
krb5_flags ap_req_options;
530
krb5_error_code KRB5_LIB_FUNCTION
531
krb5_rd_req_in_ctx_alloc(krb5_context context, krb5_rd_req_in_ctx *ctx)
533
*ctx = calloc(1, sizeof(**ctx));
535
krb5_set_error_message(context, ENOMEM,
536
N_("malloc: out of memory", ""));
539
(*ctx)->check_pac = (context->flags & KRB5_CTX_F_CHECK_PAC) ? 1 : 0;
543
krb5_error_code KRB5_LIB_FUNCTION
544
krb5_rd_req_in_set_keytab(krb5_context context,
545
krb5_rd_req_in_ctx in,
548
in->keytab = keytab; /* XXX should make copy */
553
* Set if krb5_rq_red() is going to check the Windows PAC or not
555
* @param context Keberos 5 context.
556
* @param in krb5_rd_req_in_ctx to check the option on.
557
* @param flag flag to select if to check the pac (TRUE) or not (FALSE).
559
* @return Kerberos 5 error code, see krb5_get_error_message().
564
krb5_error_code KRB5_LIB_FUNCTION
565
krb5_rd_req_in_set_pac_check(krb5_context context,
566
krb5_rd_req_in_ctx in,
569
in->check_pac = flag;
574
krb5_error_code KRB5_LIB_FUNCTION
575
krb5_rd_req_in_set_keyblock(krb5_context context,
576
krb5_rd_req_in_ctx in,
577
krb5_keyblock *keyblock)
579
in->keyblock = keyblock; /* XXX should make copy */
583
krb5_error_code KRB5_LIB_FUNCTION
584
krb5_rd_req_out_get_ap_req_options(krb5_context context,
585
krb5_rd_req_out_ctx out,
586
krb5_flags *ap_req_options)
588
*ap_req_options = out->ap_req_options;
592
krb5_error_code KRB5_LIB_FUNCTION
593
krb5_rd_req_out_get_ticket(krb5_context context,
594
krb5_rd_req_out_ctx out,
595
krb5_ticket **ticket)
597
return krb5_copy_ticket(context, out->ticket, ticket);
600
krb5_error_code KRB5_LIB_FUNCTION
601
krb5_rd_req_out_get_keyblock(krb5_context context,
602
krb5_rd_req_out_ctx out,
603
krb5_keyblock **keyblock)
605
return krb5_copy_keyblock(context, out->keyblock, keyblock);
608
void KRB5_LIB_FUNCTION
609
krb5_rd_req_in_ctx_free(krb5_context context, krb5_rd_req_in_ctx ctx)
614
krb5_error_code KRB5_LIB_FUNCTION
615
_krb5_rd_req_out_ctx_alloc(krb5_context context, krb5_rd_req_out_ctx *ctx)
617
*ctx = calloc(1, sizeof(**ctx));
619
krb5_set_error_message(context, ENOMEM,
620
N_("malloc: out of memory", ""));
626
void KRB5_LIB_FUNCTION
627
krb5_rd_req_out_ctx_free(krb5_context context, krb5_rd_req_out_ctx ctx)
629
krb5_free_keyblock(context, ctx->keyblock);
637
krb5_error_code KRB5_LIB_FUNCTION
638
krb5_rd_req(krb5_context context,
639
krb5_auth_context *auth_context,
640
const krb5_data *inbuf,
641
krb5_const_principal server,
643
krb5_flags *ap_req_options,
644
krb5_ticket **ticket)
647
krb5_rd_req_in_ctx in;
648
krb5_rd_req_out_ctx out;
650
ret = krb5_rd_req_in_ctx_alloc(context, &in);
654
ret = krb5_rd_req_in_set_keytab(context, in, keytab);
656
krb5_rd_req_in_ctx_free(context, in);
660
ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
661
krb5_rd_req_in_ctx_free(context, in);
666
*ap_req_options = out->ap_req_options;
668
ret = krb5_copy_ticket(context, out->ticket, ticket);
674
krb5_rd_req_out_ctx_free(context, out);
682
krb5_error_code KRB5_LIB_FUNCTION
683
krb5_rd_req_with_keyblock(krb5_context context,
684
krb5_auth_context *auth_context,
685
const krb5_data *inbuf,
686
krb5_const_principal server,
687
krb5_keyblock *keyblock,
688
krb5_flags *ap_req_options,
689
krb5_ticket **ticket)
692
krb5_rd_req_in_ctx in;
693
krb5_rd_req_out_ctx out;
695
ret = krb5_rd_req_in_ctx_alloc(context, &in);
699
ret = krb5_rd_req_in_set_keyblock(context, in, keyblock);
701
krb5_rd_req_in_ctx_free(context, in);
705
ret = krb5_rd_req_ctx(context, auth_context, inbuf, server, in, &out);
706
krb5_rd_req_in_ctx_free(context, in);
711
*ap_req_options = out->ap_req_options;
713
ret = krb5_copy_ticket(context, out->ticket, ticket);
719
krb5_rd_req_out_ctx_free(context, out);
727
static krb5_error_code
728
get_key_from_keytab(krb5_context context,
729
krb5_auth_context *auth_context,
731
krb5_const_principal server,
733
krb5_keyblock **out_key)
735
krb5_keytab_entry entry;
738
krb5_keytab real_keytab;
741
krb5_kt_default(context, &real_keytab);
743
real_keytab = keytab;
745
if (ap_req->ticket.enc_part.kvno)
746
kvno = *ap_req->ticket.enc_part.kvno;
750
ret = krb5_kt_get_entry (context,
754
ap_req->ticket.enc_part.etype,
758
ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
759
krb5_kt_free_entry (context, &entry);
762
krb5_kt_close(context, real_keytab);
771
krb5_error_code KRB5_LIB_FUNCTION
772
krb5_rd_req_ctx(krb5_context context,
773
krb5_auth_context *auth_context,
774
const krb5_data *inbuf,
775
krb5_const_principal server,
776
krb5_rd_req_in_ctx inctx,
777
krb5_rd_req_out_ctx *outctx)
781
krb5_principal service = NULL;
782
krb5_rd_req_out_ctx o = NULL;
784
ret = _krb5_rd_req_out_ctx_alloc(context, &o);
788
if (*auth_context == NULL) {
789
ret = krb5_auth_con_init(context, auth_context);
794
ret = krb5_decode_ap_req(context, inbuf, &ap_req);
799
ret = _krb5_principalname2krb5_principal(context,
802
ap_req.ticket.realm);
807
if (ap_req.ap_options.use_session_key &&
808
(*auth_context)->keyblock == NULL) {
809
ret = KRB5KRB_AP_ERR_NOKEY;
810
krb5_set_error_message(context, ret,
811
N_("krb5_rd_req: user to user auth "
812
"without session key given", ""));
816
if((*auth_context)->keyblock){
817
ret = krb5_copy_keyblock(context,
818
(*auth_context)->keyblock,
822
} else if(inctx->keyblock){
823
ret = krb5_copy_keyblock(context,
829
krb5_keytab keytab = NULL;
831
if (inctx && inctx->keytab)
832
keytab = inctx->keytab;
834
ret = get_key_from_keytab(context,
844
ret = krb5_verify_ap_req2(context,
852
KRB5_KU_AP_REQ_AUTH);
857
/* If there is a PAC, verify its server signature */
858
if (inctx->check_pac) {
862
ret = krb5_ticket_get_authorization_data_type(context,
864
KRB5_AUTHDATA_WIN2K_PAC,
867
ret = krb5_pac_parse(context, data.data, data.length, &pac);
868
krb5_data_free(&data);
872
ret = krb5_pac_verify(context,
874
o->ticket->ticket.authtime,
878
krb5_pac_free(context, pac);
885
if (ret || outctx == NULL) {
886
krb5_rd_req_out_ctx_free(context, o);
890
free_AP_REQ(&ap_req);
892
krb5_free_principal(context, service);