2 * Copyright (c) 1997 - 2001, 2003 - 2005 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>
36 RCSID("$Id: rd_req.c,v 1.63 2006/04/10 10:14:44 lha Exp $");
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_string (context);
117 return KRB5KRB_AP_ERR_BADVERSION;
119 if (ap_req->msg_type != krb_ap_req){
121 krb5_clear_error_string (context);
122 return KRB5KRB_AP_ERR_MSG_TYPE;
124 if (ap_req->ticket.tkt_vno != 5){
126 krb5_clear_error_string (context);
127 return KRB5KRB_AP_ERR_BADVERSION;
132 static krb5_error_code
133 check_transited(krb5_context context, Ticket *ticket, EncTicketPart *enc)
140 * Windows 2000 and 2003 uses this inside their TGT so its 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 free_AD_IF_RELEVANT(&adIfRelevant);
217 krb5_error_code KRB5_LIB_FUNCTION
218 krb5_decrypt_ticket(krb5_context context,
226 ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
232 time_t start = t.authtime;
234 krb5_timeofday (context, &now);
236 start = *t.starttime;
237 if(start - now > context->max_skew
239 && !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
240 free_EncTicketPart(&t);
241 krb5_clear_error_string (context);
242 return KRB5KRB_AP_ERR_TKT_NYV;
244 if(now - t.endtime > context->max_skew) {
245 free_EncTicketPart(&t);
246 krb5_clear_error_string (context);
247 return KRB5KRB_AP_ERR_TKT_EXPIRED;
250 if(!t.flags.transited_policy_checked) {
251 ret = check_transited(context, ticket, &t);
253 free_EncTicketPart(&t);
262 free_EncTicketPart(&t);
266 krb5_error_code KRB5_LIB_FUNCTION
267 krb5_verify_authenticator_checksum(krb5_context context,
268 krb5_auth_context ac,
274 krb5_authenticator authenticator;
277 ret = krb5_auth_con_getauthenticator (context,
282 if(authenticator->cksum == NULL) {
283 krb5_free_authenticator(context, &authenticator);
286 ret = krb5_auth_con_getkey(context, ac, &key);
288 krb5_free_authenticator(context, &authenticator);
291 ret = krb5_crypto_init(context, key, 0, &crypto);
294 ret = krb5_verify_checksum (context,
296 KRB5_KU_AP_REQ_AUTH_CKSUM,
299 authenticator->cksum);
300 krb5_crypto_destroy(context, crypto);
302 krb5_free_authenticator(context, &authenticator);
303 krb5_free_keyblock(context, key);
308 krb5_error_code KRB5_LIB_FUNCTION
309 krb5_verify_ap_req(krb5_context context,
310 krb5_auth_context *auth_context,
312 krb5_const_principal server,
313 krb5_keyblock *keyblock,
315 krb5_flags *ap_req_options,
316 krb5_ticket **ticket)
318 return krb5_verify_ap_req2 (context,
326 KRB5_KU_AP_REQ_AUTH);
329 krb5_error_code KRB5_LIB_FUNCTION
330 krb5_verify_ap_req2(krb5_context context,
331 krb5_auth_context *auth_context,
333 krb5_const_principal server,
334 krb5_keyblock *keyblock,
336 krb5_flags *ap_req_options,
337 krb5_ticket **ticket,
338 krb5_key_usage usage)
341 krb5_auth_context ac;
348 if (auth_context && *auth_context) {
351 ret = krb5_auth_con_init (context, &ac);
356 t = calloc(1, sizeof(*t));
359 krb5_clear_error_string (context);
363 if (ap_req->ap_options.use_session_key && ac->keyblock){
364 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
368 krb5_free_keyblock(context, ac->keyblock);
371 ret = krb5_decrypt_ticket(context, &ap_req->ticket,
379 ret = _krb5_principalname2krb5_principal(&t->server, ap_req->ticket.sname,
380 ap_req->ticket.realm);
382 ret = _krb5_principalname2krb5_principal(&t->client, t->ticket.cname,
388 ret = krb5_copy_keyblock(context, &t->ticket.key, &ac->keyblock);
391 ret = decrypt_authenticator (context,
393 &ap_req->authenticator,
400 krb5_principal p1, p2;
403 _krb5_principalname2krb5_principal(&p1,
404 ac->authenticator->cname,
405 ac->authenticator->crealm);
406 _krb5_principalname2krb5_principal(&p2,
409 res = krb5_principal_compare (context, p1, p2);
410 krb5_free_principal (context, p1);
411 krb5_free_principal (context, p2);
413 ret = KRB5KRB_AP_ERR_BADMATCH;
414 krb5_clear_error_string (context);
419 /* check addresses */
422 && ac->remote_address
423 && !krb5_address_search (context,
426 ret = KRB5KRB_AP_ERR_BADADDR;
427 krb5_clear_error_string (context);
431 /* check timestamp in authenticator */
435 krb5_timeofday (context, &now);
437 if (abs(ac->authenticator->ctime - now) > context->max_skew) {
438 ret = KRB5KRB_AP_ERR_SKEW;
439 krb5_clear_error_string (context);
444 if (ac->authenticator->seq_number)
445 krb5_auth_con_setremoteseqnumber(context, ac,
446 *ac->authenticator->seq_number);
448 /* XXX - Xor sequence numbers */
450 if (ac->authenticator->subkey) {
451 ret = krb5_auth_con_setremotesubkey(context, ac,
452 ac->authenticator->subkey);
457 ret = find_etypelist(context, ac, &etypes);
461 ac->keytype = ETYPE_NULL;
466 for (i = 0; i < etypes.len; i++) {
467 if (krb5_enctype_valid(context, etypes.val[i]) == 0) {
468 ac->keytype = etypes.val[i];
474 if (ap_req_options) {
476 if (ac->keytype != ETYPE_NULL)
477 *ap_req_options |= AP_OPTS_USE_SUBKEY;
478 if (ap_req->ap_options.use_session_key)
479 *ap_req_options |= AP_OPTS_USE_SESSION_KEY;
480 if (ap_req->ap_options.mutual_required)
481 *ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
487 krb5_free_ticket (context, t);
489 if (*auth_context == NULL)
492 krb5_auth_con_free (context, ac);
493 free_EtypeList(&etypes);
497 krb5_free_ticket (context, t);
498 if (auth_context == NULL || *auth_context == NULL)
499 krb5_auth_con_free (context, ac);
504 krb5_error_code KRB5_LIB_FUNCTION
505 krb5_rd_req_with_keyblock(krb5_context context,
506 krb5_auth_context *auth_context,
507 const krb5_data *inbuf,
508 krb5_const_principal server,
509 krb5_keyblock *keyblock,
510 krb5_flags *ap_req_options,
511 krb5_ticket **ticket)
516 if (*auth_context == NULL) {
517 ret = krb5_auth_con_init(context, auth_context);
522 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
526 ret = krb5_verify_ap_req(context,
535 free_AP_REQ(&ap_req);
539 static krb5_error_code
540 get_key_from_keytab(krb5_context context,
541 krb5_auth_context *auth_context,
543 krb5_const_principal server,
545 krb5_keyblock **out_key)
547 krb5_keytab_entry entry;
550 krb5_keytab real_keytab;
553 krb5_kt_default(context, &real_keytab);
555 real_keytab = keytab;
557 if (ap_req->ticket.enc_part.kvno)
558 kvno = *ap_req->ticket.enc_part.kvno;
562 ret = krb5_kt_get_entry (context,
566 ap_req->ticket.enc_part.etype,
570 ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
571 krb5_kt_free_entry (context, &entry);
574 krb5_kt_close(context, real_keytab);
579 krb5_error_code KRB5_LIB_FUNCTION
580 krb5_rd_req_return_keyblock(krb5_context context,
581 krb5_auth_context *auth_context,
582 const krb5_data *inbuf,
583 krb5_const_principal server,
585 krb5_flags *ap_req_options,
586 krb5_ticket **ticket,
587 krb5_keyblock **return_keyblock)
591 krb5_keyblock *keyblock = NULL;
592 krb5_principal service = NULL;
595 *return_keyblock = NULL;
597 if (*auth_context == NULL) {
598 ret = krb5_auth_con_init(context, auth_context);
603 ret = krb5_decode_ap_req(context, inbuf, &ap_req);
608 _krb5_principalname2krb5_principal(&service,
610 ap_req.ticket.realm);
613 if (ap_req.ap_options.use_session_key &&
614 (*auth_context)->keyblock == NULL) {
615 krb5_set_error_string(context, "krb5_rd_req: user to user auth "
616 "without session key given");
617 ret = KRB5KRB_AP_ERR_NOKEY;
621 if((*auth_context)->keyblock == NULL){
622 ret = get_key_from_keytab(context,
631 ret = krb5_copy_keyblock(context,
632 (*auth_context)->keyblock,
638 ret = krb5_verify_ap_req(context,
647 if (ret == 0 && return_keyblock)
648 *return_keyblock = keyblock;
650 krb5_free_keyblock(context, keyblock);
653 free_AP_REQ(&ap_req);
655 krb5_free_principal(context, service);
659 krb5_error_code KRB5_LIB_FUNCTION
660 krb5_rd_req(krb5_context context,
661 krb5_auth_context *auth_context,
662 const krb5_data *inbuf,
663 krb5_const_principal server,
665 krb5_flags *ap_req_options,
666 krb5_ticket **ticket)
668 return krb5_rd_req_return_keyblock(context,