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[heimdal.git] / lib / krb5 / get_cred.c
blobe3bb23a2e9d72b9ef9bdea46f5ecd4cc05f4bfec
1 /*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37 #include <assert.h>
38
39 static krb5_error_code
40 get_cred_kdc_capath(krb5_context, krb5_kdc_flags,
41 krb5_ccache, krb5_creds *, krb5_principal,
42 Ticket *, krb5_creds **, krb5_creds ***);
43
44 /*
45 * Take the `body' and encode it into `padata' using the credentials
46 * in `creds'.
47 */
48
49 static krb5_error_code
50 make_pa_tgs_req(krb5_context context,
51 krb5_auth_context ac,
52 KDC_REQ_BODY *body,
53 PA_DATA *padata,
54 krb5_creds *creds)
55 {
56 u_char *buf;
57 size_t buf_size;
58 size_t len = 0;
59 krb5_data in_data;
60 krb5_error_code ret;
61
62 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
63 if (ret)
64 goto out;
65 if(buf_size != len)
66 krb5_abortx(context, "internal error in ASN.1 encoder");
67
68 in_data.length = len;
69 in_data.data = buf;
70 ret = _krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
71 &padata->padata_value,
72 KRB5_KU_TGS_REQ_AUTH_CKSUM,
73 KRB5_KU_TGS_REQ_AUTH);
74 out:
75 free (buf);
76 if(ret)
77 return ret;
78 padata->padata_type = KRB5_PADATA_TGS_REQ;
79 return 0;
80 }
81
82 /*
83 * Set the `enc-authorization-data' in `req_body' based on `authdata'
84 */
85
86 static krb5_error_code
87 set_auth_data (krb5_context context,
88 KDC_REQ_BODY *req_body,
89 krb5_authdata *authdata,
90 krb5_keyblock *subkey)
91 {
92 if(authdata->len) {
93 size_t len = 0, buf_size;
94 unsigned char *buf;
95 krb5_crypto crypto;
96 krb5_error_code ret;
97
98 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata,
99 &len, ret);
100 if (ret)
101 return ret;
102 if (buf_size != len)
103 krb5_abortx(context, "internal error in ASN.1 encoder");
104
105 ALLOC(req_body->enc_authorization_data, 1);
106 if (req_body->enc_authorization_data == NULL) {
107 free (buf);
108 krb5_set_error_message(context, ENOMEM,
109 N_("malloc: out of memory", ""));
110 return ENOMEM;
111 }
112 ret = krb5_crypto_init(context, subkey, 0, &crypto);
113 if (ret) {
114 free (buf);
115 free (req_body->enc_authorization_data);
116 req_body->enc_authorization_data = NULL;
117 return ret;
118 }
119 krb5_encrypt_EncryptedData(context,
120 crypto,
121 KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
122 buf,
123 len,
124 0,
125 req_body->enc_authorization_data);
126 free (buf);
127 krb5_crypto_destroy(context, crypto);
128 } else {
129 req_body->enc_authorization_data = NULL;
130 }
131 return 0;
132 }
133
134 /*
135 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
136 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
137 * subkey in `subkey'.
138 */
139
140 static krb5_error_code
141 init_tgs_req (krb5_context context,
142 krb5_ccache ccache,
143 krb5_addresses *addresses,
144 krb5_kdc_flags flags,
145 Ticket *second_ticket,
146 krb5_creds *in_creds,
147 krb5_creds *krbtgt,
148 unsigned nonce,
149 const METHOD_DATA *padata,
150 krb5_keyblock **subkey,
151 TGS_REQ *t)
152 {
153 krb5_auth_context ac = NULL;
154 krb5_error_code ret = 0;
155
156 memset(t, 0, sizeof(*t));
157 t->pvno = 5;
158 t->msg_type = krb_tgs_req;
159 if (in_creds->session.keytype) {
160 ALLOC_SEQ(&t->req_body.etype, 1);
161 if(t->req_body.etype.val == NULL) {
162 ret = ENOMEM;
163 krb5_set_error_message(context, ret,
164 N_("malloc: out of memory", ""));
165 goto fail;
166 }
167 t->req_body.etype.val[0] = in_creds->session.keytype;
168 } else {
169 ret = _krb5_init_etype(context,
170 KRB5_PDU_TGS_REQUEST,
171 &t->req_body.etype.len,
172 &t->req_body.etype.val,
173 NULL);
174 }
175 if (ret)
176 goto fail;
177 t->req_body.addresses = addresses;
178 t->req_body.kdc_options = flags.b;
179 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
180 if (ret)
181 goto fail;
182 ALLOC(t->req_body.sname, 1);
183 if (t->req_body.sname == NULL) {
184 ret = ENOMEM;
185 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
186 goto fail;
187 }
188
189 /* some versions of some code might require that the client be
190 present in TGS-REQs, but this is clearly against the spec */
191
192 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
193 if (ret)
194 goto fail;
195
196 /* req_body.till should be NULL if there is no endtime specified,
197 but old MIT code (like DCE secd) doesn't like that */
198 ALLOC(t->req_body.till, 1);
199 if(t->req_body.till == NULL){
200 ret = ENOMEM;
201 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
202 goto fail;
203 }
204 *t->req_body.till = in_creds->times.endtime;
205
206 t->req_body.nonce = nonce;
207 if(second_ticket){
208 ALLOC(t->req_body.additional_tickets, 1);
209 if (t->req_body.additional_tickets == NULL) {
210 ret = ENOMEM;
211 krb5_set_error_message(context, ret,
212 N_("malloc: out of memory", ""));
213 goto fail;
214 }
215 ALLOC_SEQ(t->req_body.additional_tickets, 1);
216 if (t->req_body.additional_tickets->val == NULL) {
217 ret = ENOMEM;
218 krb5_set_error_message(context, ret,
219 N_("malloc: out of memory", ""));
220 goto fail;
221 }
222 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
223 if (ret)
224 goto fail;
225 }
226 ALLOC(t->padata, 1);
227 if (t->padata == NULL) {
228 ret = ENOMEM;
229 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
230 goto fail;
231 }
232 ALLOC_SEQ(t->padata, 1 + padata->len);
233 if (t->padata->val == NULL) {
234 ret = ENOMEM;
235 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
236 goto fail;
237 }
238 {
239 size_t i;
240 for (i = 0; i < padata->len; i++) {
241 ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
242 if (ret) {
243 krb5_set_error_message(context, ret,
244 N_("malloc: out of memory", ""));
245 goto fail;
246 }
247 }
248 }
249
250 ret = krb5_auth_con_init(context, &ac);
251 if(ret)
252 goto fail;
253
254 ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session);
255 if (ret)
256 goto fail;
257
258 ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
259 ac->local_subkey);
260 if (ret)
261 goto fail;
262
263 ret = make_pa_tgs_req(context,
264 ac,
265 &t->req_body,
266 &t->padata->val[0],
267 krbtgt);
268 if(ret)
269 goto fail;
270
271 ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
272 if (ret)
273 goto fail;
274
275 fail:
276 if (ac)
277 krb5_auth_con_free(context, ac);
278 if (ret) {
279 t->req_body.addresses = NULL;
280 free_TGS_REQ (t);
281 }
282 return ret;
283 }
284
285 krb5_error_code
286 _krb5_get_krbtgt(krb5_context context,
287 krb5_ccache id,
288 krb5_realm realm,
289 krb5_creds **cred)
290 {
291 krb5_error_code ret;
292 krb5_creds tmp_cred;
293
294 memset(&tmp_cred, 0, sizeof(tmp_cred));
295
296 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
297 if (ret)
298 return ret;
299
300 ret = krb5_make_principal(context,
301 &tmp_cred.server,
302 realm,
303 KRB5_TGS_NAME,
304 realm,
305 NULL);
306 if(ret) {
307 krb5_free_principal(context, tmp_cred.client);
308 return ret;
309 }
310 ret = krb5_get_credentials(context,
311 KRB5_GC_CACHED,
312 id,
313 &tmp_cred,
314 cred);
315 krb5_free_principal(context, tmp_cred.client);
316 krb5_free_principal(context, tmp_cred.server);
317 if(ret)
318 return ret;
319 return 0;
320 }
321
322 /* DCE compatible decrypt proc */
323 static krb5_error_code KRB5_CALLCONV
324 decrypt_tkt_with_subkey (krb5_context context,
325 krb5_keyblock *key,
326 krb5_key_usage usage,
327 krb5_const_pointer skey,
328 krb5_kdc_rep *dec_rep)
329 {
330 const krb5_keyblock *subkey = skey;
331 krb5_error_code ret = 0;
332 krb5_data data;
333 size_t size;
334 krb5_crypto crypto;
335
336 assert(usage == 0);
337
338 krb5_data_zero(&data);
339
340 /*
341 * start out with trying with subkey if we have one
342 */
343 if (subkey) {
344 ret = krb5_crypto_init(context, subkey, 0, &crypto);
345 if (ret)
346 return ret;
347 ret = krb5_decrypt_EncryptedData (context,
348 crypto,
349 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
350 &dec_rep->kdc_rep.enc_part,
351 &data);
352 /*
353 * If the is Windows 2000 DC, we need to retry with key usage
354 * 8 when doing ARCFOUR.
355 */
356 if (ret && subkey->keytype == ETYPE_ARCFOUR_HMAC_MD5) {
357 ret = krb5_decrypt_EncryptedData(context,
358 crypto,
359 8,
360 &dec_rep->kdc_rep.enc_part,
361 &data);
362 }
363 krb5_crypto_destroy(context, crypto);
364 }
365 if (subkey == NULL || ret) {
366 ret = krb5_crypto_init(context, key, 0, &crypto);
367 if (ret)
368 return ret;
369 ret = krb5_decrypt_EncryptedData (context,
370 crypto,
371 KRB5_KU_TGS_REP_ENC_PART_SESSION,
372 &dec_rep->kdc_rep.enc_part,
373 &data);
374 krb5_crypto_destroy(context, crypto);
375 }
376 if (ret)
377 return ret;
378
379 ret = decode_EncASRepPart(data.data,
380 data.length,
381 &dec_rep->enc_part,
382 &size);
383 if (ret)
384 ret = decode_EncTGSRepPart(data.data,
385 data.length,
386 &dec_rep->enc_part,
387 &size);
388 if (ret)
389 krb5_set_error_message(context, ret,
390 N_("Failed to decode encpart in ticket", ""));
391 krb5_data_free (&data);
392 return ret;
393 }
394
395 static krb5_error_code
396 get_cred_kdc(krb5_context context,
397 krb5_ccache id,
398 krb5_kdc_flags flags,
399 krb5_addresses *addresses,
400 krb5_creds *in_creds,
401 krb5_creds *krbtgt,
402 krb5_principal impersonate_principal,
403 Ticket *second_ticket,
404 krb5_creds *out_creds)
405 {
406 TGS_REQ req;
407 krb5_data enc;
408 krb5_data resp;
409 krb5_kdc_rep rep;
410 KRB_ERROR error;
411 krb5_error_code ret;
412 unsigned nonce;
413 krb5_keyblock *subkey = NULL;
414 size_t len = 0;
415 Ticket second_ticket_data;
416 METHOD_DATA padata;
417
418 krb5_data_zero(&resp);
419 krb5_data_zero(&enc);
420 padata.val = NULL;
421 padata.len = 0;
422
423 krb5_generate_random_block(&nonce, sizeof(nonce));
424 nonce &= 0xffffffff;
425
426 if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
427 ret = decode_Ticket(in_creds->second_ticket.data,
428 in_creds->second_ticket.length,
429 &second_ticket_data, &len);
430 if(ret)
431 return ret;
432 second_ticket = &second_ticket_data;
433 }
434
435
436 if (impersonate_principal) {
437 krb5_crypto crypto;
438 PA_S4U2Self self;
439 krb5_data data;
440 void *buf;
441 size_t size = 0;
442
443 self.name = impersonate_principal->name;
444 self.realm = impersonate_principal->realm;
445 self.auth = estrdup("Kerberos");
446
447 ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
448 if (ret) {
449 free(self.auth);
450 goto out;
451 }
452
453 ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
454 if (ret) {
455 free(self.auth);
456 krb5_data_free(&data);
457 goto out;
458 }
459
460 ret = krb5_create_checksum(context,
461 crypto,
462 KRB5_KU_OTHER_CKSUM,
463 0,
464 data.data,
465 data.length,
466 &self.cksum);
467 krb5_crypto_destroy(context, crypto);
468 krb5_data_free(&data);
469 if (ret) {
470 free(self.auth);
471 goto out;
472 }
473
474 ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
475 free(self.auth);
476 free_Checksum(&self.cksum);
477 if (ret)
478 goto out;
479 if (len != size)
480 krb5_abortx(context, "internal asn1 error");
481
482 ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
483 if (ret)
484 goto out;
485 }
486
487 ret = init_tgs_req (context,
488 id,
489 addresses,
490 flags,
491 second_ticket,
492 in_creds,
493 krbtgt,
494 nonce,
495 &padata,
496 &subkey,
497 &req);
498 if (ret)
499 goto out;
500
501 ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
502 if (ret)
503 goto out;
504 if(enc.length != len)
505 krb5_abortx(context, "internal error in ASN.1 encoder");
506
507 /* don't free addresses */
508 req.req_body.addresses = NULL;
509 free_TGS_REQ(&req);
510
511 /*
512 * Send and receive
513 */
514 {
515 krb5_sendto_ctx stctx;
516 ret = krb5_sendto_ctx_alloc(context, &stctx);
517 if (ret)
518 return ret;
519 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
520
521 ret = krb5_sendto_context (context, stctx, &enc,
522 krbtgt->server->name.name_string.val[1],
523 &resp);
524 krb5_sendto_ctx_free(context, stctx);
525 }
526 if(ret)
527 goto out;
528
529 memset(&rep, 0, sizeof(rep));
530 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
531 unsigned eflags = 0;
532
533 ret = krb5_copy_principal(context,
534 in_creds->client,
535 &out_creds->client);
536 if(ret)
537 goto out2;
538 ret = krb5_copy_principal(context,
539 in_creds->server,
540 &out_creds->server);
541 if(ret)
542 goto out2;
543 /* this should go someplace else */
544 out_creds->times.endtime = in_creds->times.endtime;
545
546 /* XXX should do better testing */
547 if (flags.b.constrained_delegation || impersonate_principal)
548 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
549
550 ret = _krb5_extract_ticket(context,
551 &rep,
552 out_creds,
553 &krbtgt->session,
554 NULL,
555 0,
556 &krbtgt->addresses,
557 nonce,
558 eflags,
559 decrypt_tkt_with_subkey,
560 subkey);
561 out2:
562 krb5_free_kdc_rep(context, &rep);
563 } else if(krb5_rd_error(context, &resp, &error) == 0) {
564 ret = krb5_error_from_rd_error(context, &error, in_creds);
565 krb5_free_error_contents(context, &error);
566 } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
567 ret = KRB5KRB_AP_ERR_V4_REPLY;
568 krb5_clear_error_message(context);
569 } else {
570 ret = KRB5KRB_AP_ERR_MSG_TYPE;
571 krb5_clear_error_message(context);
572 }
573
574 out:
575 if (second_ticket == &second_ticket_data)
576 free_Ticket(&second_ticket_data);
577 free_METHOD_DATA(&padata);
578 krb5_data_free(&resp);
579 krb5_data_free(&enc);
580 if(subkey)
581 krb5_free_keyblock(context, subkey);
582 return ret;
583
584 }
585
586 /*
587 * same as above, just get local addresses first if the krbtgt have
588 * them and the realm is not addressless
589 */
590
591 static krb5_error_code
592 get_cred_kdc_address(krb5_context context,
593 krb5_ccache id,
594 krb5_kdc_flags flags,
595 krb5_addresses *addrs,
596 krb5_creds *in_creds,
597 krb5_creds *krbtgt,
598 krb5_principal impersonate_principal,
599 Ticket *second_ticket,
600 krb5_creds *out_creds)
601 {
602 krb5_error_code ret;
603 krb5_addresses addresses = { 0, NULL };
604
605 /*
606 * Inherit the address-ness of the krbtgt if the address is not
607 * specified.
608 */
609
610 if (addrs == NULL && krbtgt->addresses.len != 0) {
611 krb5_boolean noaddr;
612
613 krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
614 "no-addresses", FALSE, &noaddr);
615
616 if (!noaddr) {
617 krb5_get_all_client_addrs(context, &addresses);
618 /* XXX this sucks. */
619 addrs = &addresses;
620 if(addresses.len == 0)
621 addrs = NULL;
622 }
623 }
624 ret = get_cred_kdc(context, id, flags, addrs, in_creds,
625 krbtgt, impersonate_principal,
626 second_ticket, out_creds);
627 krb5_free_addresses(context, &addresses);
628 return ret;
629 }
630
631 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
632 krb5_get_kdc_cred(krb5_context context,
633 krb5_ccache id,
634 krb5_kdc_flags flags,
635 krb5_addresses *addresses,
636 Ticket *second_ticket,
637 krb5_creds *in_creds,
638 krb5_creds **out_creds
639 )
640 {
641 krb5_error_code ret;
642 krb5_creds *krbtgt;
643
644 *out_creds = calloc(1, sizeof(**out_creds));
645 if(*out_creds == NULL) {
646 krb5_set_error_message(context, ENOMEM,
647 N_("malloc: out of memory", ""));
648 return ENOMEM;
649 }
650 ret = _krb5_get_krbtgt (context,
651 id,
652 in_creds->server->realm,
653 &krbtgt);
654 if(ret) {
655 free(*out_creds);
656 *out_creds = NULL;
657 return ret;
658 }
659 ret = get_cred_kdc(context, id, flags, addresses,
660 in_creds, krbtgt, NULL, NULL, *out_creds);
661 krb5_free_creds (context, krbtgt);
662 if(ret) {
663 free(*out_creds);
664 *out_creds = NULL;
665 }
666 return ret;
667 }
668
669 static int
670 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
671 {
672 krb5_error_code ret;
673 char *str;
674
675 ret = krb5_unparse_name(context, p, &str);
676 if(ret) {
677 krb5_clear_error_message(context);
678 return code;
679 }
680 krb5_set_error_message(context, code,
681 N_("Matching credential (%s) not found", ""), str);
682 free(str);
683 return code;
684 }
685
686 static krb5_error_code
687 find_cred(krb5_context context,
688 krb5_ccache id,
689 krb5_principal server,
690 krb5_creds **tgts,
691 krb5_creds *out_creds)
692 {
693 krb5_error_code ret;
694 krb5_creds mcreds;
695
696 krb5_cc_clear_mcred(&mcreds);
697 mcreds.server = server;
698 ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
699 &mcreds, out_creds);
700 if(ret == 0)
701 return 0;
702 while(tgts && *tgts){
703 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
704 &mcreds, *tgts)){
705 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
706 return ret;
707 }
708 tgts++;
709 }
710 return not_found(context, server, KRB5_CC_NOTFOUND);
711 }
712
713 static krb5_error_code
714 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
715 {
716 int i;
717 krb5_error_code ret;
718 krb5_creds **tmp = *tgts;
719
720 for(i = 0; tmp && tmp[i]; i++); /* XXX */
721 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
722 if(tmp == NULL) {
723 krb5_set_error_message(context, ENOMEM,
724 N_("malloc: out of memory", ""));
725 return ENOMEM;
726 }
727 *tgts = tmp;
728 ret = krb5_copy_creds(context, tkt, &tmp[i]);
729 tmp[i+1] = NULL;
730 return ret;
731 }
732
733 static krb5_error_code
734 get_cred_kdc_capath_worker(krb5_context context,
735 krb5_kdc_flags flags,
736 krb5_ccache ccache,
737 krb5_creds *in_creds,
738 krb5_const_realm try_realm,
739 krb5_principal impersonate_principal,
740 Ticket *second_ticket,
741 krb5_creds **out_creds,
742 krb5_creds ***ret_tgts)
743 {
744 krb5_error_code ret;
745 krb5_creds *tgt, tmp_creds;
746 krb5_const_realm client_realm, server_realm;
747 int ok_as_delegate = 1;
748
749 *out_creds = NULL;
750
751 client_realm = krb5_principal_get_realm(context, in_creds->client);
752 server_realm = krb5_principal_get_realm(context, in_creds->server);
753 memset(&tmp_creds, 0, sizeof(tmp_creds));
754 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
755 if(ret)
756 return ret;
757
758 ret = krb5_make_principal(context,
759 &tmp_creds.server,
760 try_realm,
761 KRB5_TGS_NAME,
762 server_realm,
763 NULL);
764 if(ret){
765 krb5_free_principal(context, tmp_creds.client);
766 return ret;
767 }
768 {
769 krb5_creds tgts;
770
771 ret = find_cred(context, ccache, tmp_creds.server,
772 *ret_tgts, &tgts);
773 if(ret == 0){
774 /* only allow implicit ok_as_delegate if the realm is the clients realm */
775 if (strcmp(try_realm, client_realm) != 0 || strcmp(try_realm, server_realm) != 0)
776 ok_as_delegate = tgts.flags.b.ok_as_delegate;
777
778 *out_creds = calloc(1, sizeof(**out_creds));
779 if(*out_creds == NULL) {
780 ret = ENOMEM;
781 krb5_set_error_message(context, ret,
782 N_("malloc: out of memory", ""));
783 } else {
784 ret = get_cred_kdc_address(context, ccache, flags, NULL,
785 in_creds, &tgts,
786 impersonate_principal,
787 second_ticket,
788 *out_creds);
789 if (ret) {
790 free (*out_creds);
791 *out_creds = NULL;
792 } else if (ok_as_delegate == 0)
793 (*out_creds)->flags.b.ok_as_delegate = 0;
794 }
795 krb5_free_cred_contents(context, &tgts);
796 krb5_free_principal(context, tmp_creds.server);
797 krb5_free_principal(context, tmp_creds.client);
798 return ret;
799 }
800 }
801 if(krb5_realm_compare(context, in_creds->client, in_creds->server))
802 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
803
804 /* XXX this can loop forever */
805 while(1){
806 heim_general_string tgt_inst;
807
808 ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds,
809 NULL, NULL, &tgt, ret_tgts);
810 if(ret) {
811 krb5_free_principal(context, tmp_creds.server);
812 krb5_free_principal(context, tmp_creds.client);
813 return ret;
814 }
815 /*
816 * if either of the chain or the ok_as_delegate was stripped
817 * by the kdc, make sure we strip it too.
818 */
819 if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
820 ok_as_delegate = 0;
821 tgt->flags.b.ok_as_delegate = 0;
822 }
823
824 ret = add_cred(context, tgt, ret_tgts);
825 if(ret) {
826 krb5_free_principal(context, tmp_creds.server);
827 krb5_free_principal(context, tmp_creds.client);
828 return ret;
829 }
830 tgt_inst = tgt->server->name.name_string.val[1];
831 if(strcmp(tgt_inst, server_realm) == 0)
832 break;
833 krb5_free_principal(context, tmp_creds.server);
834 ret = krb5_make_principal(context, &tmp_creds.server,
835 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
836 if(ret) {
837 krb5_free_principal(context, tmp_creds.server);
838 krb5_free_principal(context, tmp_creds.client);
839 return ret;
840 }
841 ret = krb5_free_creds(context, tgt);
842 if(ret) {
843 krb5_free_principal(context, tmp_creds.server);
844 krb5_free_principal(context, tmp_creds.client);
845 return ret;
846 }
847 }
848
849 krb5_free_principal(context, tmp_creds.server);
850 krb5_free_principal(context, tmp_creds.client);
851 *out_creds = calloc(1, sizeof(**out_creds));
852 if(*out_creds == NULL) {
853 ret = ENOMEM;
854 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
855 } else {
856 ret = get_cred_kdc_address (context, ccache, flags, NULL,
857 in_creds, tgt, impersonate_principal,
858 second_ticket, *out_creds);
859 if (ret) {
860 free (*out_creds);
861 *out_creds = NULL;
862 }
863 }
864 krb5_free_creds(context, tgt);
865 return ret;
866 }
867
868 /*
869 get_cred(server)
870 creds = cc_get_cred(server)
871 if(creds) return creds
872 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
873 if(tgt)
874 return get_cred_tgt(server, tgt)
875 if(client_realm == server_realm)
876 return NULL
877 tgt = get_cred(krbtgt/server_realm@client_realm)
878 while(tgt_inst != server_realm)
879 tgt = get_cred(krbtgt/server_realm@tgt_inst)
880 return get_cred_tgt(server, tgt)
881 */
882
883 static krb5_error_code
884 get_cred_kdc_capath(krb5_context context,
885 krb5_kdc_flags flags,
886 krb5_ccache ccache,
887 krb5_creds *in_creds,
888 krb5_principal impersonate_principal,
889 Ticket *second_ticket,
890 krb5_creds **out_creds,
891 krb5_creds ***ret_tgts)
892 {
893 krb5_error_code ret;
894 krb5_const_realm client_realm, server_realm, try_realm;
895
896 client_realm = krb5_principal_get_realm(context, in_creds->client);
897 server_realm = krb5_principal_get_realm(context, in_creds->server);
898
899 try_realm = client_realm;
900 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds, try_realm,
901 impersonate_principal, second_ticket, out_creds,
902 ret_tgts);
903
904 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
905 try_realm = krb5_config_get_string(context, NULL, "capaths",
906 client_realm, server_realm, NULL);
907
908 if (try_realm != NULL && strcmp(try_realm, client_realm)) {
909 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds,
910 try_realm, impersonate_principal,
911 second_ticket, out_creds, ret_tgts);
912 }
913 }
914
915 return ret;
916 }
917
918 static krb5_error_code
919 get_cred_kdc_referral(krb5_context context,
920 krb5_kdc_flags flags,
921 krb5_ccache ccache,
922 krb5_creds *in_creds,
923 krb5_principal impersonate_principal,
924 Ticket *second_ticket,
925 krb5_creds **out_creds,
926 krb5_creds ***ret_tgts)
927 {
928 krb5_const_realm client_realm;
929 krb5_error_code ret;
930 krb5_creds tgt, referral, ticket;
931 int loop = 0;
932 int ok_as_delegate = 1;
933
934 if (in_creds->server->name.name_string.len < 2 && !flags.b.canonicalize) {
935 krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED,
936 N_("Name too short to do referals, skipping", ""));
937 return KRB5KDC_ERR_PATH_NOT_ACCEPTED;
938 }
939
940 memset(&tgt, 0, sizeof(tgt));
941 memset(&ticket, 0, sizeof(ticket));
942
943 flags.b.canonicalize = 1;
944
945 *out_creds = NULL;
946
947 client_realm = krb5_principal_get_realm(context, in_creds->client);
948
949 /* find tgt for the clients base realm */
950 {
951 krb5_principal tgtname;
952
953 ret = krb5_make_principal(context, &tgtname,
954 client_realm,
955 KRB5_TGS_NAME,
956 client_realm,
957 NULL);
958 if(ret)
959 return ret;
960
961 ret = find_cred(context, ccache, tgtname, *ret_tgts, &tgt);
962 krb5_free_principal(context, tgtname);
963 if (ret)
964 return ret;
965 }
966
967 referral = *in_creds;
968 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
969 if (ret) {
970 krb5_free_cred_contents(context, &tgt);
971 return ret;
972 }
973 ret = krb5_principal_set_realm(context, referral.server, client_realm);
974 if (ret) {
975 krb5_free_cred_contents(context, &tgt);
976 krb5_free_principal(context, referral.server);
977 return ret;
978 }
979
980 while (loop++ < 17) {
981 krb5_creds **tickets;
982 krb5_creds mcreds;
983 char *referral_realm;
984
985 /* Use cache if we are not doing impersonation or contrainte deleg */
986 if (impersonate_principal == NULL || flags.b.constrained_delegation) {
987 krb5_cc_clear_mcred(&mcreds);
988 mcreds.server = referral.server;
989 ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcreds, &ticket);
990 } else
991 ret = EINVAL;
992
993 if (ret) {
994 ret = get_cred_kdc_address(context, ccache, flags, NULL,
995 &referral, &tgt, impersonate_principal,
996 second_ticket, &ticket);
997 if (ret)
998 goto out;
999 }
1000
1001 /* Did we get the right ticket ? */
1002 if (krb5_principal_compare_any_realm(context,
1003 referral.server,
1004 ticket.server))
1005 break;
1006
1007 if (!krb5_principal_is_krbtgt(context, ticket.server)) {
1008 krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
1009 N_("Got back an non krbtgt "
1010 "ticket referrals", ""));
1011 ret = KRB5KRB_AP_ERR_NOT_US;
1012 goto out;
1013 }
1014
1015 referral_realm = ticket.server->name.name_string.val[1];
1016
1017 /* check that there are no referrals loops */
1018 tickets = *ret_tgts;
1019
1020 krb5_cc_clear_mcred(&mcreds);
1021 mcreds.server = ticket.server;
1022
1023 while(tickets && *tickets){
1024 if(krb5_compare_creds(context,
1025 KRB5_TC_DONT_MATCH_REALM,
1026 &mcreds,
1027 *tickets))
1028 {
1029 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1030 N_("Referral from %s "
1031 "loops back to realm %s", ""),
1032 tgt.server->realm,
1033 referral_realm);
1034 ret = KRB5_GET_IN_TKT_LOOP;
1035 goto out;
1036 }
1037 tickets++;
1038 }
1039
1040 /*
1041 * if either of the chain or the ok_as_delegate was stripped
1042 * by the kdc, make sure we strip it too.
1043 */
1044
1045 if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
1046 ok_as_delegate = 0;
1047 ticket.flags.b.ok_as_delegate = 0;
1048 }
1049
1050 ret = add_cred(context, &ticket, ret_tgts);
1051 if (ret)
1052 goto out;
1053
1054 /* try realm in the referral */
1055 ret = krb5_principal_set_realm(context,
1056 referral.server,
1057 referral_realm);
1058 krb5_free_cred_contents(context, &tgt);
1059 tgt = ticket;
1060 memset(&ticket, 0, sizeof(ticket));
1061 if (ret)
1062 goto out;
1063 }
1064
1065 ret = krb5_copy_creds(context, &ticket, out_creds);
1066
1067 out:
1068 krb5_free_principal(context, referral.server);
1069 krb5_free_cred_contents(context, &tgt);
1070 krb5_free_cred_contents(context, &ticket);
1071 return ret;
1072 }
1073
1074
1075 /*
1076 * Glue function between referrals version and old client chasing
1077 * codebase.
1078 */
1079
1080 krb5_error_code
1081 _krb5_get_cred_kdc_any(krb5_context context,
1082 krb5_kdc_flags flags,
1083 krb5_ccache ccache,
1084 krb5_creds *in_creds,
1085 krb5_principal impersonate_principal,
1086 Ticket *second_ticket,
1087 krb5_creds **out_creds,
1088 krb5_creds ***ret_tgts)
1089 {
1090 krb5_error_code ret;
1091 krb5_deltat offset;
1092
1093 ret = krb5_cc_get_kdc_offset(context, ccache, &offset);
1094 if (ret) {
1095 context->kdc_sec_offset = offset;
1096 context->kdc_usec_offset = 0;
1097 }
1098
1099 ret = get_cred_kdc_referral(context,
1100 flags,
1101 ccache,
1102 in_creds,
1103 impersonate_principal,
1104 second_ticket,
1105 out_creds,
1106 ret_tgts);
1107 if (ret == 0 || flags.b.canonicalize)
1108 return ret;
1109 return get_cred_kdc_capath(context,
1110 flags,
1111 ccache,
1112 in_creds,
1113 impersonate_principal,
1114 second_ticket,
1115 out_creds,
1116 ret_tgts);
1117 }
1118
1119
1120 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1121 krb5_get_credentials_with_flags(krb5_context context,
1122 krb5_flags options,
1123 krb5_kdc_flags flags,
1124 krb5_ccache ccache,
1125 krb5_creds *in_creds,
1126 krb5_creds **out_creds)
1127 {
1128 krb5_error_code ret;
1129 krb5_creds **tgts;
1130 krb5_creds *res_creds;
1131 int i;
1132
1133 if (in_creds->session.keytype) {
1134 ret = krb5_enctype_valid(context, in_creds->session.keytype);
1135 if (ret)
1136 return ret;
1137 }
1138
1139 *out_creds = NULL;
1140 res_creds = calloc(1, sizeof(*res_creds));
1141 if (res_creds == NULL) {
1142 krb5_set_error_message(context, ENOMEM,
1143 N_("malloc: out of memory", ""));
1144 return ENOMEM;
1145 }
1146
1147 if (in_creds->session.keytype)
1148 options |= KRB5_TC_MATCH_KEYTYPE;
1149
1150 /*
1151 * If we got a credential, check if credential is expired before
1152 * returning it.
1153 */
1154 ret = krb5_cc_retrieve_cred(context,
1155 ccache,
1156 in_creds->session.keytype ?
1157 KRB5_TC_MATCH_KEYTYPE : 0,
1158 in_creds, res_creds);
1159 /*
1160 * If we got a credential, check if credential is expired before
1161 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1162 */
1163 if (ret == 0) {
1164 krb5_timestamp timeret;
1165
1166 /* If expired ok, don't bother checking */
1167 if(options & KRB5_GC_EXPIRED_OK) {
1168 *out_creds = res_creds;
1169 return 0;
1170 }
1171
1172 krb5_timeofday(context, &timeret);
1173 if(res_creds->times.endtime > timeret) {
1174 *out_creds = res_creds;
1175 return 0;
1176 }
1177 if(options & KRB5_GC_CACHED)
1178 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1179
1180 } else if(ret != KRB5_CC_END) {
1181 free(res_creds);
1182 return ret;
1183 }
1184 free(res_creds);
1185 if(options & KRB5_GC_CACHED)
1186 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
1187
1188 if(options & KRB5_GC_USER_USER)
1189 flags.b.enc_tkt_in_skey = 1;
1190 if (flags.b.enc_tkt_in_skey)
1191 options |= KRB5_GC_NO_STORE;
1192
1193 tgts = NULL;
1194 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1195 in_creds, NULL, NULL, out_creds, &tgts);
1196 for(i = 0; tgts && tgts[i]; i++) {
1197 krb5_cc_store_cred(context, ccache, tgts[i]);
1198 krb5_free_creds(context, tgts[i]);
1199 }
1200 free(tgts);
1201 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1202 krb5_cc_store_cred(context, ccache, *out_creds);
1203 return ret;
1204 }
1205
1206 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1207 krb5_get_credentials(krb5_context context,
1208 krb5_flags options,
1209 krb5_ccache ccache,
1210 krb5_creds *in_creds,
1211 krb5_creds **out_creds)
1212 {
1213 krb5_kdc_flags flags;
1214 flags.i = 0;
1215 return krb5_get_credentials_with_flags(context, options, flags,
1216 ccache, in_creds, out_creds);
1217 }
1218
1219 struct krb5_get_creds_opt_data {
1220 krb5_principal self;
1221 krb5_flags options;
1222 krb5_enctype enctype;
1223 Ticket *ticket;
1224 };
1225
1226
1227 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1228 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1229 {
1230 *opt = calloc(1, sizeof(**opt));
1231 if (*opt == NULL) {
1232 krb5_set_error_message(context, ENOMEM,
1233 N_("malloc: out of memory", ""));
1234 return ENOMEM;
1235 }
1236 return 0;
1237 }
1238
1239 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1240 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1241 {
1242 if (opt->self)
1243 krb5_free_principal(context, opt->self);
1244 if (opt->ticket) {
1245 free_Ticket(opt->ticket);
1246 free(opt->ticket);
1247 }
1248 memset(opt, 0, sizeof(*opt));
1249 free(opt);
1250 }
1251
1252 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1253 krb5_get_creds_opt_set_options(krb5_context context,
1254 krb5_get_creds_opt opt,
1255 krb5_flags options)
1256 {
1257 opt->options = options;
1258 }
1259
1260 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1261 krb5_get_creds_opt_add_options(krb5_context context,
1262 krb5_get_creds_opt opt,
1263 krb5_flags options)
1264 {
1265 opt->options |= options;
1266 }
1267
1268 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1269 krb5_get_creds_opt_set_enctype(krb5_context context,
1270 krb5_get_creds_opt opt,
1271 krb5_enctype enctype)
1272 {
1273 opt->enctype = enctype;
1274 }
1275
1276 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1277 krb5_get_creds_opt_set_impersonate(krb5_context context,
1278 krb5_get_creds_opt opt,
1279 krb5_const_principal self)
1280 {
1281 if (opt->self)
1282 krb5_free_principal(context, opt->self);
1283 return krb5_copy_principal(context, self, &opt->self);
1284 }
1285
1286 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1287 krb5_get_creds_opt_set_ticket(krb5_context context,
1288 krb5_get_creds_opt opt,
1289 const Ticket *ticket)
1290 {
1291 if (opt->ticket) {
1292 free_Ticket(opt->ticket);
1293 free(opt->ticket);
1294 opt->ticket = NULL;
1295 }
1296 if (ticket) {
1297 krb5_error_code ret;
1298
1299 opt->ticket = malloc(sizeof(*ticket));
1300 if (opt->ticket == NULL) {
1301 krb5_set_error_message(context, ENOMEM,
1302 N_("malloc: out of memory", ""));
1303 return ENOMEM;
1304 }
1305 ret = copy_Ticket(ticket, opt->ticket);
1306 if (ret) {
1307 free(opt->ticket);
1308 opt->ticket = NULL;
1309 krb5_set_error_message(context, ret,
1310 N_("malloc: out of memory", ""));
1311 return ret;
1312 }
1313 }
1314 return 0;
1315 }
1316
1317
1318
1319 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1320 krb5_get_creds(krb5_context context,
1321 krb5_get_creds_opt opt,
1322 krb5_ccache ccache,
1323 krb5_const_principal inprinc,
1324 krb5_creds **out_creds)
1325 {
1326 krb5_kdc_flags flags;
1327 krb5_flags options;
1328 krb5_creds in_creds;
1329 krb5_error_code ret;
1330 krb5_creds **tgts;
1331 krb5_creds *res_creds;
1332 int i;
1333
1334 if (opt && opt->enctype) {
1335 ret = krb5_enctype_valid(context, opt->enctype);
1336 if (ret)
1337 return ret;
1338 }
1339
1340 memset(&in_creds, 0, sizeof(in_creds));
1341 in_creds.server = rk_UNCONST(inprinc);
1342
1343 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1344 if (ret)
1345 return ret;
1346
1347 if (opt)
1348 options = opt->options;
1349 else
1350 options = 0;
1351 flags.i = 0;
1352
1353 *out_creds = NULL;
1354 res_creds = calloc(1, sizeof(*res_creds));
1355 if (res_creds == NULL) {
1356 krb5_free_principal(context, in_creds.client);
1357 krb5_set_error_message(context, ENOMEM,
1358 N_("malloc: out of memory", ""));
1359 return ENOMEM;
1360 }
1361
1362 if (opt && opt->enctype) {
1363 in_creds.session.keytype = opt->enctype;
1364 options |= KRB5_TC_MATCH_KEYTYPE;
1365 }
1366
1367 /*
1368 * If we got a credential, check if credential is expired before
1369 * returning it.
1370 */
1371 ret = krb5_cc_retrieve_cred(context,
1372 ccache,
1373 options & KRB5_TC_MATCH_KEYTYPE,
1374 &in_creds, res_creds);
1375 /*
1376 * If we got a credential, check if credential is expired before
1377 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1378 */
1379 if (ret == 0) {
1380 krb5_timestamp timeret;
1381
1382 /* If expired ok, don't bother checking */
1383 if(options & KRB5_GC_EXPIRED_OK) {
1384 *out_creds = res_creds;
1385 krb5_free_principal(context, in_creds.client);
1386 goto out;
1387 }
1388
1389 krb5_timeofday(context, &timeret);
1390 if(res_creds->times.endtime > timeret) {
1391 *out_creds = res_creds;
1392 krb5_free_principal(context, in_creds.client);
1393 goto out;
1394 }
1395 if(options & KRB5_GC_CACHED)
1396 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1397
1398 } else if(ret != KRB5_CC_END) {
1399 free(res_creds);
1400 krb5_free_principal(context, in_creds.client);
1401 goto out;
1402 }
1403 free(res_creds);
1404 if(options & KRB5_GC_CACHED) {
1405 krb5_free_principal(context, in_creds.client);
1406 ret = not_found(context, in_creds.server, KRB5_CC_NOTFOUND);
1407 goto out;
1408 }
1409 if(options & KRB5_GC_USER_USER) {
1410 flags.b.enc_tkt_in_skey = 1;
1411 options |= KRB5_GC_NO_STORE;
1412 }
1413 if (options & KRB5_GC_FORWARDABLE)
1414 flags.b.forwardable = 1;
1415 if (options & KRB5_GC_NO_TRANSIT_CHECK)
1416 flags.b.disable_transited_check = 1;
1417 if (options & KRB5_GC_CONSTRAINED_DELEGATION) {
1418 flags.b.request_anonymous = 1; /* XXX ARGH confusion */
1419 flags.b.constrained_delegation = 1;
1420 }
1421 if (options & KRB5_GC_CANONICALIZE)
1422 flags.b.canonicalize = 1;
1423
1424 tgts = NULL;
1425 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1426 &in_creds, opt->self, opt->ticket,
1427 out_creds, &tgts);
1428 krb5_free_principal(context, in_creds.client);
1429 for(i = 0; tgts && tgts[i]; i++) {
1430 krb5_cc_store_cred(context, ccache, tgts[i]);
1431 krb5_free_creds(context, tgts[i]);
1432 }
1433 free(tgts);
1434 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1435 krb5_cc_store_cred(context, ccache, *out_creds);
1436
1437 out:
1438 _krb5_debug(context, 5, "krb5_get_creds: ret = %d", ret);
1439
1440 return ret;
1441 }
1442
1443 /*
1444 *
1445 */
1446
1447 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1448 krb5_get_renewed_creds(krb5_context context,
1449 krb5_creds *creds,
1450 krb5_const_principal client,
1451 krb5_ccache ccache,
1452 const char *in_tkt_service)
1453 {
1454 krb5_error_code ret;
1455 krb5_kdc_flags flags;
1456 krb5_creds in, *template, *out = NULL;
1457
1458 memset(&in, 0, sizeof(in));
1459 memset(creds, 0, sizeof(*creds));
1460
1461 ret = krb5_copy_principal(context, client, &in.client);
1462 if (ret)
1463 return ret;
1464
1465 if (in_tkt_service) {
1466 ret = krb5_parse_name(context, in_tkt_service, &in.server);
1467 if (ret) {
1468 krb5_free_principal(context, in.client);
1469 return ret;
1470 }
1471 } else {
1472 const char *realm = krb5_principal_get_realm(context, client);
1473
1474 ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1475 realm, NULL);
1476 if (ret) {
1477 krb5_free_principal(context, in.client);
1478 return ret;
1479 }
1480 }
1481
1482 flags.i = 0;
1483 flags.b.renewable = flags.b.renew = 1;
1484
1485 /*
1486 * Get template from old credential cache for the same entry, if
1487 * this failes, no worries.
1488 */
1489 ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
1490 if (ret == 0) {
1491 flags.b.forwardable = template->flags.b.forwardable;
1492 flags.b.proxiable = template->flags.b.proxiable;
1493 krb5_free_creds (context, template);
1494 }
1495
1496 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
1497 krb5_free_principal(context, in.client);
1498 krb5_free_principal(context, in.server);
1499 if (ret)
1500 return ret;
1501
1502 ret = krb5_copy_creds_contents(context, out, creds);
1503 krb5_free_creds(context, out);
1504
1505 return ret;
1506 }
Heimdal