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
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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34 #include <krb5_locl.h>
36 RCSID("$Id: get_cred.c,v 1.91 2002/09/04 21:12:46 joda Exp $");
39 * Take the `body' and encode it into `padata' using the credentials
43 static krb5_error_code
44 make_pa_tgs_req(krb5_context context,
57 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
61 krb5_abortx(context, "internal error in ASN.1 encoder");
65 ret = krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
66 &padata->padata_value,
67 KRB5_KU_TGS_REQ_AUTH_CKSUM,
69 /* KRB5_KU_TGS_REQ_AUTH */);
74 padata->padata_type = KRB5_PADATA_TGS_REQ;
79 * Set the `enc-authorization-data' in `req_body' based on `authdata'
82 static krb5_error_code
83 set_auth_data (krb5_context context,
84 KDC_REQ_BODY *req_body,
85 krb5_authdata *authdata,
94 ASN1_MALLOC_ENCODE(AuthorizationData, buf, len, authdata, &len, ret);
98 ALLOC(req_body->enc_authorization_data, 1);
99 if (req_body->enc_authorization_data == NULL) {
101 krb5_set_error_string(context, "malloc: out of memory");
104 ret = krb5_crypto_init(context, key, 0, &crypto);
107 free (req_body->enc_authorization_data);
110 krb5_encrypt_EncryptedData(context,
112 KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
113 /* KRB5_KU_TGS_REQ_AUTH_DAT_SESSION? */
117 req_body->enc_authorization_data);
119 krb5_crypto_destroy(context, crypto);
121 req_body->enc_authorization_data = NULL;
127 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
128 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
129 * subkey in `subkey'.
132 static krb5_error_code
133 init_tgs_req (krb5_context context,
135 krb5_addresses *addresses,
136 krb5_kdc_flags flags,
137 Ticket *second_ticket,
138 krb5_creds *in_creds,
141 krb5_keyblock **subkey,
143 krb5_key_usage usage)
145 krb5_error_code ret = 0;
147 memset(t, 0, sizeof(*t));
149 t->msg_type = krb_tgs_req;
150 if (in_creds->session.keytype) {
151 ALLOC_SEQ(&t->req_body.etype, 1);
152 if(t->req_body.etype.val == NULL) {
154 krb5_set_error_string(context, "malloc: out of memory");
157 t->req_body.etype.val[0] = in_creds->session.keytype;
159 ret = krb5_init_etype(context,
160 &t->req_body.etype.len,
161 &t->req_body.etype.val,
166 t->req_body.addresses = addresses;
167 t->req_body.kdc_options = flags.b;
168 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
171 ALLOC(t->req_body.sname, 1);
172 if (t->req_body.sname == NULL) {
174 krb5_set_error_string(context, "malloc: out of memory");
178 /* some versions of some code might require that the client be
179 present in TGS-REQs, but this is clearly against the spec */
181 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
185 /* req_body.till should be NULL if there is no endtime specified,
186 but old MIT code (like DCE secd) doesn't like that */
187 ALLOC(t->req_body.till, 1);
188 if(t->req_body.till == NULL){
190 krb5_set_error_string(context, "malloc: out of memory");
193 *t->req_body.till = in_creds->times.endtime;
195 t->req_body.nonce = nonce;
197 ALLOC(t->req_body.additional_tickets, 1);
198 if (t->req_body.additional_tickets == NULL) {
200 krb5_set_error_string(context, "malloc: out of memory");
203 ALLOC_SEQ(t->req_body.additional_tickets, 1);
204 if (t->req_body.additional_tickets->val == NULL) {
206 krb5_set_error_string(context, "malloc: out of memory");
209 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
214 if (t->padata == NULL) {
216 krb5_set_error_string(context, "malloc: out of memory");
219 ALLOC_SEQ(t->padata, 1);
220 if (t->padata->val == NULL) {
222 krb5_set_error_string(context, "malloc: out of memory");
227 krb5_auth_context ac;
230 ret = krb5_auth_con_init(context, &ac);
233 ret = krb5_generate_subkey (context, &krbtgt->session, &key);
235 krb5_auth_con_free (context, ac);
238 ret = krb5_auth_con_setlocalsubkey(context, ac, key);
240 krb5_free_keyblock (context, key);
241 krb5_auth_con_free (context, ac);
245 ret = set_auth_data (context, &t->req_body, &in_creds->authdata, key);
247 krb5_free_keyblock (context, key);
248 krb5_auth_con_free (context, ac);
252 ret = make_pa_tgs_req(context,
259 krb5_free_keyblock (context, key);
260 krb5_auth_con_free(context, ac);
265 krb5_auth_con_free(context, ac);
269 /* XXX - don't free addresses? */
274 static krb5_error_code
275 get_krbtgt(krb5_context context,
283 memset(&tmp_cred, 0, sizeof(tmp_cred));
285 ret = krb5_make_principal(context,
293 ret = krb5_get_credentials(context,
298 krb5_free_principal(context, tmp_cred.server);
304 /* DCE compatible decrypt proc */
305 static krb5_error_code
306 decrypt_tkt_with_subkey (krb5_context context,
308 krb5_key_usage usage,
309 krb5_const_pointer subkey,
310 krb5_kdc_rep *dec_rep)
317 ret = krb5_crypto_init(context, key, 0, &crypto);
320 ret = krb5_decrypt_EncryptedData (context,
323 &dec_rep->kdc_rep.enc_part,
325 krb5_crypto_destroy(context, crypto);
327 /* DCE compat -- try to decrypt with subkey */
328 ret = krb5_crypto_init(context, (krb5_keyblock*)subkey, 0, &crypto);
331 ret = krb5_decrypt_EncryptedData (context,
333 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
334 &dec_rep->kdc_rep.enc_part,
336 krb5_crypto_destroy(context, crypto);
341 ret = krb5_decode_EncASRepPart(context,
347 ret = krb5_decode_EncTGSRepPart(context,
352 krb5_data_free (&data);
356 static krb5_error_code
357 get_cred_kdc_usage(krb5_context context,
359 krb5_kdc_flags flags,
360 krb5_addresses *addresses,
361 krb5_creds *in_creds,
363 krb5_creds *out_creds,
364 krb5_key_usage usage)
373 krb5_keyblock *subkey = NULL;
377 Ticket second_ticket;
379 krb5_generate_random_block(&nonce, sizeof(nonce));
382 if(flags.b.enc_tkt_in_skey){
383 ret = decode_Ticket(in_creds->second_ticket.data,
384 in_creds->second_ticket.length,
385 &second_ticket, &len);
390 ret = init_tgs_req (context,
394 flags.b.enc_tkt_in_skey ? &second_ticket : NULL,
401 if(flags.b.enc_tkt_in_skey)
402 free_Ticket(&second_ticket);
406 ASN1_MALLOC_ENCODE(TGS_REQ, buf, buf_size, &req, &enc.length, ret);
409 if(enc.length != buf_size)
410 krb5_abortx(context, "internal error in ASN.1 encoder");
412 /* don't free addresses */
413 req.req_body.addresses = NULL;
416 enc.data = buf + buf_size - enc.length;
424 ret = krb5_sendto_kdc (context, &enc,
425 &krbtgt->server->name.name_string.val[1], &resp);
429 memset(&rep, 0, sizeof(rep));
430 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0){
431 ret = krb5_copy_principal(context,
436 ret = krb5_copy_principal(context,
441 /* this should go someplace else */
442 out_creds->times.endtime = in_creds->times.endtime;
444 ret = _krb5_extract_ticket(context,
449 KRB5_KU_TGS_REP_ENC_PART_SESSION,
453 flags.b.request_anonymous,
454 decrypt_tkt_with_subkey,
456 krb5_free_kdc_rep(context, &rep);
459 } else if(krb5_rd_error(context, &resp, &error) == 0) {
460 ret = krb5_error_from_rd_error(context, &error, in_creds);
461 krb5_free_error_contents(context, &error);
462 } else if(resp.data && ((char*)resp.data)[0] == 4) {
463 ret = KRB5KRB_AP_ERR_V4_REPLY;
464 krb5_clear_error_string(context);
466 ret = KRB5KRB_AP_ERR_MSG_TYPE;
467 krb5_clear_error_string(context);
469 krb5_data_free(&resp);
472 krb5_free_keyblock_contents(context, subkey);
481 static krb5_error_code
482 get_cred_kdc(krb5_context context,
484 krb5_kdc_flags flags,
485 krb5_addresses *addresses,
486 krb5_creds *in_creds,
488 krb5_creds *out_creds)
492 ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
493 krbtgt, out_creds, KRB5_KU_TGS_REQ_AUTH);
494 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
495 krb5_clear_error_string (context);
496 ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
497 krbtgt, out_creds, KRB5_KU_AP_REQ_AUTH);
502 /* same as above, just get local addresses first */
504 static krb5_error_code
505 get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
506 krb5_creds *in_creds, krb5_creds *krbtgt,
507 krb5_creds *out_creds)
510 krb5_addresses addresses, *addrs = &addresses;
512 krb5_get_all_client_addrs(context, &addresses);
513 /* XXX this sucks. */
514 if(addresses.len == 0)
516 ret = get_cred_kdc(context, id, flags, addrs,
517 in_creds, krbtgt, out_creds);
518 krb5_free_addresses(context, &addresses);
523 krb5_get_kdc_cred(krb5_context context,
525 krb5_kdc_flags flags,
526 krb5_addresses *addresses,
527 Ticket *second_ticket,
528 krb5_creds *in_creds,
529 krb5_creds **out_creds
535 *out_creds = calloc(1, sizeof(**out_creds));
536 if(*out_creds == NULL) {
537 krb5_set_error_string(context, "malloc: out of memory");
540 ret = get_krbtgt (context,
542 in_creds->server->realm,
548 ret = get_cred_kdc(context, id, flags, addresses,
549 in_creds, krbtgt, *out_creds);
550 krb5_free_creds (context, krbtgt);
557 static krb5_error_code
558 find_cred(krb5_context context,
560 krb5_principal server,
562 krb5_creds *out_creds)
566 mcreds.server = server;
567 ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
571 while(tgts && *tgts){
572 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
574 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
579 krb5_clear_error_string(context);
580 return KRB5_CC_NOTFOUND;
583 static krb5_error_code
584 add_cred(krb5_context context, krb5_creds ***tgts, krb5_creds *tkt)
588 krb5_creds **tmp = *tgts;
590 for(i = 0; tmp && tmp[i]; i++); /* XXX */
591 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
593 krb5_set_error_string(context, "malloc: out of memory");
597 ret = krb5_copy_creds(context, tkt, &tmp[i]);
604 creds = cc_get_cred(server)
605 if(creds) return creds
606 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
608 return get_cred_tgt(server, tgt)
609 if(client_realm == server_realm)
611 tgt = get_cred(krbtgt/server_realm@client_realm)
612 while(tgt_inst != server_realm)
613 tgt = get_cred(krbtgt/server_realm@tgt_inst)
614 return get_cred_tgt(server, tgt)
617 static krb5_error_code
618 get_cred_from_kdc_flags(krb5_context context,
619 krb5_kdc_flags flags,
621 krb5_creds *in_creds,
622 krb5_creds **out_creds,
623 krb5_creds ***ret_tgts)
626 krb5_creds *tgt, tmp_creds;
627 krb5_const_realm client_realm, server_realm, try_realm;
631 client_realm = *krb5_princ_realm(context, in_creds->client);
632 server_realm = *krb5_princ_realm(context, in_creds->server);
633 memset(&tmp_creds, 0, sizeof(tmp_creds));
634 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
638 try_realm = krb5_config_get_string(context, NULL, "libdefaults",
639 "capath", server_realm, NULL);
640 if (try_realm == NULL)
641 try_realm = client_realm;
643 ret = krb5_make_principal(context,
650 krb5_free_principal(context, tmp_creds.client);
655 /* XXX try krb5_cc_retrieve_cred first? */
656 ret = find_cred(context, ccache, tmp_creds.server,
659 *out_creds = calloc(1, sizeof(**out_creds));
660 if(*out_creds == NULL) {
661 krb5_set_error_string(context, "malloc: out of memory");
666 krb5_appdefault_boolean(context, NULL, tgts.server->realm,
667 "no-addresses", FALSE, &noaddr);
670 ret = get_cred_kdc(context, ccache, flags, NULL,
671 in_creds, &tgts, *out_creds);
673 ret = get_cred_kdc_la(context, ccache, flags,
674 in_creds, &tgts, *out_creds);
680 krb5_free_creds_contents(context, &tgts);
681 krb5_free_principal(context, tmp_creds.server);
682 krb5_free_principal(context, tmp_creds.client);
686 if(krb5_realm_compare(context, in_creds->client, in_creds->server)) {
687 krb5_clear_error_string (context);
688 return KRB5_CC_NOTFOUND;
690 /* XXX this can loop forever */
692 general_string tgt_inst;
694 ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds,
697 krb5_free_principal(context, tmp_creds.server);
698 krb5_free_principal(context, tmp_creds.client);
701 ret = add_cred(context, ret_tgts, tgt);
703 krb5_free_principal(context, tmp_creds.server);
704 krb5_free_principal(context, tmp_creds.client);
707 tgt_inst = tgt->server->name.name_string.val[1];
708 if(strcmp(tgt_inst, server_realm) == 0)
710 krb5_free_principal(context, tmp_creds.server);
711 ret = krb5_make_principal(context, &tmp_creds.server,
712 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
714 krb5_free_principal(context, tmp_creds.server);
715 krb5_free_principal(context, tmp_creds.client);
718 ret = krb5_free_creds(context, tgt);
720 krb5_free_principal(context, tmp_creds.server);
721 krb5_free_principal(context, tmp_creds.client);
726 krb5_free_principal(context, tmp_creds.server);
727 krb5_free_principal(context, tmp_creds.client);
728 *out_creds = calloc(1, sizeof(**out_creds));
729 if(*out_creds == NULL) {
730 krb5_set_error_string(context, "malloc: out of memory");
735 krb5_appdefault_boolean(context, NULL, tgt->server->realm,
736 "no-addresses", FALSE, &noaddr);
738 ret = get_cred_kdc (context, ccache, flags, NULL,
739 in_creds, tgt, *out_creds);
741 ret = get_cred_kdc_la(context, ccache, flags,
742 in_creds, tgt, *out_creds);
748 krb5_free_creds(context, tgt);
753 krb5_get_cred_from_kdc_opt(krb5_context context,
755 krb5_creds *in_creds,
756 krb5_creds **out_creds,
757 krb5_creds ***ret_tgts,
762 return get_cred_from_kdc_flags(context, f, ccache,
763 in_creds, out_creds, ret_tgts);
767 krb5_get_cred_from_kdc(krb5_context context,
769 krb5_creds *in_creds,
770 krb5_creds **out_creds,
771 krb5_creds ***ret_tgts)
773 return krb5_get_cred_from_kdc_opt(context, ccache,
774 in_creds, out_creds, ret_tgts, 0);
779 krb5_get_credentials_with_flags(krb5_context context,
781 krb5_kdc_flags flags,
783 krb5_creds *in_creds,
784 krb5_creds **out_creds)
788 krb5_creds *res_creds;
792 res_creds = calloc(1, sizeof(*res_creds));
793 if (res_creds == NULL) {
794 krb5_set_error_string(context, "malloc: out of memory");
798 ret = krb5_cc_retrieve_cred(context,
800 in_creds->session.keytype ?
801 KRB5_TC_MATCH_KEYTYPE : 0,
802 in_creds, res_creds);
804 *out_creds = res_creds;
808 if(ret != KRB5_CC_END)
810 if(options & KRB5_GC_CACHED) {
811 krb5_clear_error_string (context);
812 return KRB5_CC_NOTFOUND;
814 if(options & KRB5_GC_USER_USER)
815 flags.b.enc_tkt_in_skey = 1;
817 ret = get_cred_from_kdc_flags(context, flags, ccache,
818 in_creds, out_creds, &tgts);
819 for(i = 0; tgts && tgts[i]; i++) {
820 krb5_cc_store_cred(context, ccache, tgts[i]);
821 krb5_free_creds(context, tgts[i]);
824 if(ret == 0 && flags.b.enc_tkt_in_skey == 0)
825 krb5_cc_store_cred(context, ccache, *out_creds);
830 krb5_get_credentials(krb5_context context,
833 krb5_creds *in_creds,
834 krb5_creds **out_creds)
836 krb5_kdc_flags flags;
838 return krb5_get_credentials_with_flags(context, options, flags,
839 ccache, in_creds, out_creds);