2 * Copyright (c) 1997 - 2004 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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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.
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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 1.91.4.3 2004/01/09 00:47:17 lha 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;
228 krb5_keyblock *key = NULL;
230 ret = krb5_auth_con_init(context, &ac);
234 if (krb5_config_get_bool_default(context, NULL, FALSE,
236 krbtgt->server->realm,
237 "tgs_require_subkey",
240 ret = krb5_generate_subkey (context, &krbtgt->session, &key);
242 krb5_auth_con_free (context, ac);
246 ret = krb5_auth_con_setlocalsubkey(context, ac, key);
249 krb5_free_keyblock (context, key);
250 krb5_auth_con_free (context, ac);
255 ret = set_auth_data (context, &t->req_body, &in_creds->authdata, key);
258 krb5_free_keyblock (context, key);
259 krb5_auth_con_free (context, ac);
263 ret = make_pa_tgs_req(context,
271 krb5_free_keyblock (context, key);
272 krb5_auth_con_free(context, ac);
277 krb5_auth_con_free(context, ac);
281 t->req_body.addresses = NULL;
288 _krb5_get_krbtgt(krb5_context context,
296 memset(&tmp_cred, 0, sizeof(tmp_cred));
298 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
302 ret = krb5_make_principal(context,
309 krb5_free_principal(context, tmp_cred.client);
312 ret = krb5_get_credentials(context,
317 krb5_free_principal(context, tmp_cred.client);
318 krb5_free_principal(context, tmp_cred.server);
324 /* DCE compatible decrypt proc */
325 static krb5_error_code
326 decrypt_tkt_with_subkey (krb5_context context,
328 krb5_key_usage usage,
329 krb5_const_pointer subkey,
330 krb5_kdc_rep *dec_rep)
337 ret = krb5_crypto_init(context, key, 0, &crypto);
340 ret = krb5_decrypt_EncryptedData (context,
343 &dec_rep->kdc_rep.enc_part,
345 krb5_crypto_destroy(context, crypto);
347 /* DCE compat -- try to decrypt with subkey */
348 ret = krb5_crypto_init(context, (krb5_keyblock*)subkey, 0, &crypto);
351 ret = krb5_decrypt_EncryptedData (context,
353 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
354 &dec_rep->kdc_rep.enc_part,
356 krb5_crypto_destroy(context, crypto);
361 ret = krb5_decode_EncASRepPart(context,
367 ret = krb5_decode_EncTGSRepPart(context,
372 krb5_data_free (&data);
376 static krb5_error_code
377 get_cred_kdc_usage(krb5_context context,
379 krb5_kdc_flags flags,
380 krb5_addresses *addresses,
381 krb5_creds *in_creds,
383 krb5_creds *out_creds,
384 krb5_key_usage usage)
393 krb5_keyblock *subkey = NULL;
397 Ticket second_ticket;
399 krb5_generate_random_block(&nonce, sizeof(nonce));
402 if(flags.b.enc_tkt_in_skey){
403 ret = decode_Ticket(in_creds->second_ticket.data,
404 in_creds->second_ticket.length,
405 &second_ticket, &len);
410 ret = init_tgs_req (context,
414 flags.b.enc_tkt_in_skey ? &second_ticket : NULL,
421 if(flags.b.enc_tkt_in_skey)
422 free_Ticket(&second_ticket);
426 ASN1_MALLOC_ENCODE(TGS_REQ, buf, buf_size, &req, &enc.length, ret);
429 if(enc.length != buf_size)
430 krb5_abortx(context, "internal error in ASN.1 encoder");
432 /* don't free addresses */
433 req.req_body.addresses = NULL;
436 enc.data = buf + buf_size - enc.length;
444 ret = krb5_sendto_kdc (context, &enc,
445 &krbtgt->server->name.name_string.val[1], &resp);
449 memset(&rep, 0, sizeof(rep));
450 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0){
451 ret = krb5_copy_principal(context,
456 ret = krb5_copy_principal(context,
461 /* this should go someplace else */
462 out_creds->times.endtime = in_creds->times.endtime;
464 ret = _krb5_extract_ticket(context,
469 KRB5_KU_TGS_REP_ENC_PART_SESSION,
473 flags.b.request_anonymous,
474 decrypt_tkt_with_subkey,
476 krb5_free_kdc_rep(context, &rep);
479 } else if(krb5_rd_error(context, &resp, &error) == 0) {
480 ret = krb5_error_from_rd_error(context, &error, in_creds);
481 krb5_free_error_contents(context, &error);
482 } else if(resp.data && ((char*)resp.data)[0] == 4) {
483 ret = KRB5KRB_AP_ERR_V4_REPLY;
484 krb5_clear_error_string(context);
486 ret = KRB5KRB_AP_ERR_MSG_TYPE;
487 krb5_clear_error_string(context);
489 krb5_data_free(&resp);
492 krb5_free_keyblock_contents(context, subkey);
501 static krb5_error_code
502 get_cred_kdc(krb5_context context,
504 krb5_kdc_flags flags,
505 krb5_addresses *addresses,
506 krb5_creds *in_creds,
508 krb5_creds *out_creds)
512 ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
513 krbtgt, out_creds, KRB5_KU_TGS_REQ_AUTH);
514 if (ret == KRB5KRB_AP_ERR_BAD_INTEGRITY) {
515 krb5_clear_error_string (context);
516 ret = get_cred_kdc_usage(context, id, flags, addresses, in_creds,
517 krbtgt, out_creds, KRB5_KU_AP_REQ_AUTH);
522 /* same as above, just get local addresses first */
524 static krb5_error_code
525 get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
526 krb5_creds *in_creds, krb5_creds *krbtgt,
527 krb5_creds *out_creds)
530 krb5_addresses addresses, *addrs = &addresses;
532 krb5_get_all_client_addrs(context, &addresses);
533 /* XXX this sucks. */
534 if(addresses.len == 0)
536 ret = get_cred_kdc(context, id, flags, addrs,
537 in_creds, krbtgt, out_creds);
538 krb5_free_addresses(context, &addresses);
543 krb5_get_kdc_cred(krb5_context context,
545 krb5_kdc_flags flags,
546 krb5_addresses *addresses,
547 Ticket *second_ticket,
548 krb5_creds *in_creds,
549 krb5_creds **out_creds
555 *out_creds = calloc(1, sizeof(**out_creds));
556 if(*out_creds == NULL) {
557 krb5_set_error_string(context, "malloc: out of memory");
560 ret = _krb5_get_krbtgt (context,
562 in_creds->server->realm,
568 ret = get_cred_kdc(context, id, flags, addresses,
569 in_creds, krbtgt, *out_creds);
570 krb5_free_creds (context, krbtgt);
577 static krb5_error_code
578 find_cred(krb5_context context,
580 krb5_principal server,
582 krb5_creds *out_creds)
586 mcreds.server = server;
587 ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
591 while(tgts && *tgts){
592 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
594 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
599 krb5_clear_error_string(context);
600 return KRB5_CC_NOTFOUND;
603 static krb5_error_code
604 add_cred(krb5_context context, krb5_creds ***tgts, krb5_creds *tkt)
608 krb5_creds **tmp = *tgts;
610 for(i = 0; tmp && tmp[i]; i++); /* XXX */
611 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
613 krb5_set_error_string(context, "malloc: out of memory");
617 ret = krb5_copy_creds(context, tkt, &tmp[i]);
624 creds = cc_get_cred(server)
625 if(creds) return creds
626 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
628 return get_cred_tgt(server, tgt)
629 if(client_realm == server_realm)
631 tgt = get_cred(krbtgt/server_realm@client_realm)
632 while(tgt_inst != server_realm)
633 tgt = get_cred(krbtgt/server_realm@tgt_inst)
634 return get_cred_tgt(server, tgt)
637 static krb5_error_code
638 get_cred_from_kdc_flags(krb5_context context,
639 krb5_kdc_flags flags,
641 krb5_creds *in_creds,
642 krb5_creds **out_creds,
643 krb5_creds ***ret_tgts)
646 krb5_creds *tgt, tmp_creds;
647 krb5_const_realm client_realm, server_realm, try_realm;
651 client_realm = *krb5_princ_realm(context, in_creds->client);
652 server_realm = *krb5_princ_realm(context, in_creds->server);
653 memset(&tmp_creds, 0, sizeof(tmp_creds));
654 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
658 try_realm = krb5_config_get_string(context, NULL, "capaths",
659 client_realm, server_realm, NULL);
662 /* XXX remove in future release */
663 if(try_realm == NULL)
664 try_realm = krb5_config_get_string(context, NULL, "libdefaults",
665 "capath", server_realm, NULL);
668 if (try_realm == NULL)
669 try_realm = client_realm;
671 ret = krb5_make_principal(context,
678 krb5_free_principal(context, tmp_creds.client);
683 /* XXX try krb5_cc_retrieve_cred first? */
684 ret = find_cred(context, ccache, tmp_creds.server,
687 *out_creds = calloc(1, sizeof(**out_creds));
688 if(*out_creds == NULL) {
689 krb5_set_error_string(context, "malloc: out of memory");
694 krb5_appdefault_boolean(context, NULL, tgts.server->realm,
695 "no-addresses", FALSE, &noaddr);
698 ret = get_cred_kdc(context, ccache, flags, NULL,
699 in_creds, &tgts, *out_creds);
701 ret = get_cred_kdc_la(context, ccache, flags,
702 in_creds, &tgts, *out_creds);
708 krb5_free_creds_contents(context, &tgts);
709 krb5_free_principal(context, tmp_creds.server);
710 krb5_free_principal(context, tmp_creds.client);
714 if(krb5_realm_compare(context, in_creds->client, in_creds->server)) {
715 krb5_clear_error_string (context);
716 return KRB5_CC_NOTFOUND;
718 /* XXX this can loop forever */
720 general_string tgt_inst;
722 ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds,
725 krb5_free_principal(context, tmp_creds.server);
726 krb5_free_principal(context, tmp_creds.client);
729 ret = add_cred(context, ret_tgts, tgt);
731 krb5_free_principal(context, tmp_creds.server);
732 krb5_free_principal(context, tmp_creds.client);
735 tgt_inst = tgt->server->name.name_string.val[1];
736 if(strcmp(tgt_inst, server_realm) == 0)
738 krb5_free_principal(context, tmp_creds.server);
739 ret = krb5_make_principal(context, &tmp_creds.server,
740 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
742 krb5_free_principal(context, tmp_creds.server);
743 krb5_free_principal(context, tmp_creds.client);
746 ret = krb5_free_creds(context, tgt);
748 krb5_free_principal(context, tmp_creds.server);
749 krb5_free_principal(context, tmp_creds.client);
754 krb5_free_principal(context, tmp_creds.server);
755 krb5_free_principal(context, tmp_creds.client);
756 *out_creds = calloc(1, sizeof(**out_creds));
757 if(*out_creds == NULL) {
758 krb5_set_error_string(context, "malloc: out of memory");
763 krb5_appdefault_boolean(context, NULL, tgt->server->realm,
764 "no-addresses", FALSE, &noaddr);
766 ret = get_cred_kdc (context, ccache, flags, NULL,
767 in_creds, tgt, *out_creds);
769 ret = get_cred_kdc_la(context, ccache, flags,
770 in_creds, tgt, *out_creds);
776 krb5_free_creds(context, tgt);
781 krb5_get_cred_from_kdc_opt(krb5_context context,
783 krb5_creds *in_creds,
784 krb5_creds **out_creds,
785 krb5_creds ***ret_tgts,
790 return get_cred_from_kdc_flags(context, f, ccache,
791 in_creds, out_creds, ret_tgts);
795 krb5_get_cred_from_kdc(krb5_context context,
797 krb5_creds *in_creds,
798 krb5_creds **out_creds,
799 krb5_creds ***ret_tgts)
801 return krb5_get_cred_from_kdc_opt(context, ccache,
802 in_creds, out_creds, ret_tgts, 0);
807 krb5_get_credentials_with_flags(krb5_context context,
809 krb5_kdc_flags flags,
811 krb5_creds *in_creds,
812 krb5_creds **out_creds)
816 krb5_creds *res_creds;
820 res_creds = calloc(1, sizeof(*res_creds));
821 if (res_creds == NULL) {
822 krb5_set_error_string(context, "malloc: out of memory");
826 ret = krb5_cc_retrieve_cred(context,
828 in_creds->session.keytype ?
829 KRB5_TC_MATCH_KEYTYPE : 0,
830 in_creds, res_creds);
832 *out_creds = res_creds;
836 if(ret != KRB5_CC_END)
838 if(options & KRB5_GC_CACHED) {
839 krb5_clear_error_string (context);
840 return KRB5_CC_NOTFOUND;
842 if(options & KRB5_GC_USER_USER)
843 flags.b.enc_tkt_in_skey = 1;
845 ret = get_cred_from_kdc_flags(context, flags, ccache,
846 in_creds, out_creds, &tgts);
847 for(i = 0; tgts && tgts[i]; i++) {
848 krb5_cc_store_cred(context, ccache, tgts[i]);
849 krb5_free_creds(context, tgts[i]);
852 if(ret == 0 && flags.b.enc_tkt_in_skey == 0)
853 krb5_cc_store_cred(context, ccache, *out_creds);
858 krb5_get_credentials(krb5_context context,
861 krb5_creds *in_creds,
862 krb5_creds **out_creds)
864 krb5_kdc_flags flags;
866 return krb5_get_credentials_with_flags(context, options, flags,
867 ccache, in_creds, out_creds);