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krb5: do not store TGTs if GC_NO_STORE
[heimdal.git] / lib / krb5 / get_cred.c
blobbdc9a499d2a19127df1b86c0e4de8895f676f2f8
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 return krb5_enomem(context);
109 }
110 ret = krb5_crypto_init(context, subkey, 0, &crypto);
111 if (ret) {
112 free (buf);
113 free (req_body->enc_authorization_data);
114 req_body->enc_authorization_data = NULL;
115 return ret;
116 }
117 krb5_encrypt_EncryptedData(context,
118 crypto,
119 KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
120 buf,
121 len,
122 0,
123 req_body->enc_authorization_data);
124 free (buf);
125 krb5_crypto_destroy(context, crypto);
126 } else {
127 req_body->enc_authorization_data = NULL;
128 }
129 return 0;
130 }
131
132 /*
133 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
134 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
135 * subkey in `subkey'.
136 */
137
138 static krb5_error_code
139 init_tgs_req (krb5_context context,
140 krb5_ccache ccache,
141 krb5_addresses *addresses,
142 krb5_kdc_flags flags,
143 Ticket *second_ticket,
144 krb5_creds *in_creds,
145 krb5_creds *krbtgt,
146 unsigned nonce,
147 const METHOD_DATA *padata,
148 krb5_keyblock **subkey,
149 TGS_REQ *t)
150 {
151 krb5_auth_context ac = NULL;
152 krb5_error_code ret = 0;
153
154 memset(t, 0, sizeof(*t));
155 t->pvno = 5;
156 t->msg_type = krb_tgs_req;
157 if (in_creds->session.keytype) {
158 ALLOC_SEQ(&t->req_body.etype, 1);
159 if(t->req_body.etype.val == NULL) {
160 ret = krb5_enomem(context);
161 goto fail;
162 }
163 t->req_body.etype.val[0] = in_creds->session.keytype;
164 } else {
165 ret = _krb5_init_etype(context,
166 KRB5_PDU_TGS_REQUEST,
167 &t->req_body.etype.len,
168 &t->req_body.etype.val,
169 NULL);
170 }
171 if (ret)
172 goto fail;
173 t->req_body.addresses = addresses;
174 t->req_body.kdc_options = flags.b;
175 t->req_body.kdc_options.forwardable = krbtgt->flags.b.forwardable;
176 t->req_body.kdc_options.renewable = krbtgt->flags.b.renewable;
177 t->req_body.kdc_options.proxiable = krbtgt->flags.b.proxiable;
178 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
179 if (ret)
180 goto fail;
181 ALLOC(t->req_body.sname, 1);
182 if (t->req_body.sname == NULL) {
183 ret = krb5_enomem(context);
184 goto fail;
185 }
186
187 /* some versions of some code might require that the client be
188 present in TGS-REQs, but this is clearly against the spec */
189
190 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
191 if (ret)
192 goto fail;
193
194 if (krbtgt->times.starttime) {
195 ALLOC(t->req_body.from, 1);
196 if(t->req_body.from == NULL){
197 ret = krb5_enomem(context);
198 goto fail;
199 }
200 *t->req_body.from = in_creds->times.starttime;
201 }
202
203 /* req_body.till should be NULL if there is no endtime specified,
204 but old MIT code (like DCE secd) doesn't like that */
205 ALLOC(t->req_body.till, 1);
206 if(t->req_body.till == NULL){
207 ret = krb5_enomem(context);
208 goto fail;
209 }
210 *t->req_body.till = in_creds->times.endtime;
211
212 if (t->req_body.kdc_options.renewable && krbtgt->times.renew_till) {
213 ALLOC(t->req_body.rtime, 1);
214 if(t->req_body.rtime == NULL){
215 ret = krb5_enomem(context);
216 goto fail;
217 }
218 *t->req_body.rtime = in_creds->times.renew_till;
219 }
220
221 t->req_body.nonce = nonce;
222 if(second_ticket){
223 ALLOC(t->req_body.additional_tickets, 1);
224 if (t->req_body.additional_tickets == NULL) {
225 ret = krb5_enomem(context);
226 goto fail;
227 }
228 ALLOC_SEQ(t->req_body.additional_tickets, 1);
229 if (t->req_body.additional_tickets->val == NULL) {
230 ret = krb5_enomem(context);
231 goto fail;
232 }
233 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
234 if (ret)
235 goto fail;
236 }
237 ALLOC(t->padata, 1);
238 if (t->padata == NULL) {
239 ret = krb5_enomem(context);
240 goto fail;
241 }
242 ALLOC_SEQ(t->padata, 1 + padata->len);
243 if (t->padata->val == NULL) {
244 ret = krb5_enomem(context);
245 goto fail;
246 }
247 {
248 size_t i;
249 for (i = 0; i < padata->len; i++) {
250 ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
251 if (ret) {
252 krb5_set_error_message(context, ret,
253 N_("malloc: out of memory", ""));
254 goto fail;
255 }
256 }
257 }
258
259 ret = krb5_auth_con_init(context, &ac);
260 if(ret)
261 goto fail;
262
263 ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session);
264 if (ret)
265 goto fail;
266
267 ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
268 ac->local_subkey);
269 if (ret)
270 goto fail;
271
272 ret = make_pa_tgs_req(context,
273 ac,
274 &t->req_body,
275 &t->padata->val[0],
276 krbtgt);
277 if(ret)
278 goto fail;
279
280 ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
281 if (ret)
282 goto fail;
283
284 fail:
285 if (ac)
286 krb5_auth_con_free(context, ac);
287 if (ret) {
288 t->req_body.addresses = NULL;
289 free_TGS_REQ (t);
290 }
291 return ret;
292 }
293
294 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
295 _krb5_get_krbtgt(krb5_context context,
296 krb5_ccache id,
297 krb5_realm realm,
298 krb5_creds **cred)
299 {
300 krb5_error_code ret;
301 krb5_creds tmp_cred;
302
303 memset(&tmp_cred, 0, sizeof(tmp_cred));
304
305 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
306 if (ret)
307 return ret;
308
309 ret = krb5_make_principal(context,
310 &tmp_cred.server,
311 realm,
312 KRB5_TGS_NAME,
313 realm,
314 NULL);
315 if(ret) {
316 krb5_free_principal(context, tmp_cred.client);
317 return ret;
318 }
319 ret = krb5_get_credentials(context,
320 KRB5_GC_CACHED,
321 id,
322 &tmp_cred,
323 cred);
324 krb5_free_principal(context, tmp_cred.client);
325 krb5_free_principal(context, tmp_cred.server);
326 if(ret)
327 return ret;
328 return 0;
329 }
330
331 /* DCE compatible decrypt proc */
332 static krb5_error_code KRB5_CALLCONV
333 decrypt_tkt_with_subkey (krb5_context context,
334 krb5_keyblock *key,
335 krb5_key_usage usage,
336 krb5_const_pointer skey,
337 krb5_kdc_rep *dec_rep)
338 {
339 const krb5_keyblock *subkey = skey;
340 krb5_error_code ret = 0;
341 krb5_data data;
342 size_t size;
343 krb5_crypto crypto;
344
345 assert(usage == 0);
346
347 krb5_data_zero(&data);
348
349 /*
350 * start out with trying with subkey if we have one
351 */
352 if (subkey) {
353 ret = krb5_crypto_init(context, subkey, 0, &crypto);
354 if (ret)
355 return ret;
356 ret = krb5_decrypt_EncryptedData (context,
357 crypto,
358 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
359 &dec_rep->kdc_rep.enc_part,
360 &data);
361 /*
362 * If the is Windows 2000 DC, we need to retry with key usage
363 * 8 when doing ARCFOUR.
364 */
365 if (ret && subkey->keytype == ETYPE_ARCFOUR_HMAC_MD5) {
366 ret = krb5_decrypt_EncryptedData(context,
367 crypto,
368 8,
369 &dec_rep->kdc_rep.enc_part,
370 &data);
371 }
372 krb5_crypto_destroy(context, crypto);
373 }
374 if (subkey == NULL || ret) {
375 ret = krb5_crypto_init(context, key, 0, &crypto);
376 if (ret)
377 return ret;
378 ret = krb5_decrypt_EncryptedData (context,
379 crypto,
380 KRB5_KU_TGS_REP_ENC_PART_SESSION,
381 &dec_rep->kdc_rep.enc_part,
382 &data);
383 krb5_crypto_destroy(context, crypto);
384 }
385 if (ret)
386 return ret;
387
388 ret = decode_EncASRepPart(data.data,
389 data.length,
390 &dec_rep->enc_part,
391 &size);
392 if (ret)
393 ret = decode_EncTGSRepPart(data.data,
394 data.length,
395 &dec_rep->enc_part,
396 &size);
397 if (ret)
398 krb5_set_error_message(context, ret,
399 N_("Failed to decode encpart in ticket", ""));
400 krb5_data_free (&data);
401 return ret;
402 }
403
404 static krb5_error_code
405 get_cred_kdc(krb5_context context,
406 krb5_ccache id,
407 krb5_kdc_flags flags,
408 krb5_addresses *addresses,
409 krb5_creds *in_creds,
410 krb5_creds *krbtgt,
411 krb5_principal impersonate_principal,
412 Ticket *second_ticket,
413 krb5_creds *out_creds)
414 {
415 TGS_REQ req;
416 krb5_data enc;
417 krb5_data resp;
418 krb5_kdc_rep rep;
419 KRB_ERROR error;
420 krb5_error_code ret;
421 unsigned nonce;
422 krb5_keyblock *subkey = NULL;
423 size_t len = 0;
424 Ticket second_ticket_data;
425 METHOD_DATA padata;
426
427 krb5_data_zero(&resp);
428 krb5_data_zero(&enc);
429 padata.val = NULL;
430 padata.len = 0;
431
432 krb5_generate_random_block(&nonce, sizeof(nonce));
433 nonce &= 0xffffffff;
434
435 if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
436 ret = decode_Ticket(in_creds->second_ticket.data,
437 in_creds->second_ticket.length,
438 &second_ticket_data, &len);
439 if(ret)
440 return ret;
441 second_ticket = &second_ticket_data;
442 }
443
444
445 if (impersonate_principal) {
446 krb5_crypto crypto;
447 PA_S4U2Self self;
448 krb5_data data;
449 void *buf;
450 size_t size = 0;
451
452 self.name = impersonate_principal->name;
453 self.realm = impersonate_principal->realm;
454 self.auth = estrdup("Kerberos");
455
456 ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
457 if (ret) {
458 free(self.auth);
459 goto out;
460 }
461
462 ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
463 if (ret) {
464 free(self.auth);
465 krb5_data_free(&data);
466 goto out;
467 }
468
469 ret = krb5_create_checksum(context,
470 crypto,
471 KRB5_KU_OTHER_CKSUM,
472 0,
473 data.data,
474 data.length,
475 &self.cksum);
476 krb5_crypto_destroy(context, crypto);
477 krb5_data_free(&data);
478 if (ret) {
479 free(self.auth);
480 goto out;
481 }
482
483 ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
484 free(self.auth);
485 free_Checksum(&self.cksum);
486 if (ret)
487 goto out;
488 if (len != size)
489 krb5_abortx(context, "internal asn1 error");
490
491 ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
492 if (ret)
493 goto out;
494 }
495
496 ret = init_tgs_req (context,
497 id,
498 addresses,
499 flags,
500 second_ticket,
501 in_creds,
502 krbtgt,
503 nonce,
504 &padata,
505 &subkey,
506 &req);
507 if (ret)
508 goto out;
509
510 ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
511 if (ret)
512 goto out;
513 if(enc.length != len)
514 krb5_abortx(context, "internal error in ASN.1 encoder");
515
516 /* don't free addresses */
517 req.req_body.addresses = NULL;
518 free_TGS_REQ(&req);
519
520 /*
521 * Send and receive
522 */
523 {
524 krb5_sendto_ctx stctx;
525 ret = krb5_sendto_ctx_alloc(context, &stctx);
526 if (ret)
527 return ret;
528 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
529
530 ret = krb5_sendto_context (context, stctx, &enc,
531 krbtgt->server->name.name_string.val[1],
532 &resp);
533 krb5_sendto_ctx_free(context, stctx);
534 }
535 if(ret)
536 goto out;
537
538 memset(&rep, 0, sizeof(rep));
539 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
540 unsigned eflags = 0;
541
542 ret = krb5_copy_principal(context,
543 in_creds->client,
544 &out_creds->client);
545 if(ret)
546 goto out2;
547 ret = krb5_copy_principal(context,
548 in_creds->server,
549 &out_creds->server);
550 if(ret)
551 goto out2;
552 /* this should go someplace else */
553 out_creds->times.endtime = in_creds->times.endtime;
554
555 /* XXX should do better testing */
556 if (flags.b.constrained_delegation || impersonate_principal)
557 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
558
559 ret = _krb5_extract_ticket(context,
560 &rep,
561 out_creds,
562 &krbtgt->session,
563 NULL,
564 0,
565 &krbtgt->addresses,
566 nonce,
567 eflags,
568 NULL,
569 decrypt_tkt_with_subkey,
570 subkey);
571 out2:
572 krb5_free_kdc_rep(context, &rep);
573 } else if(krb5_rd_error(context, &resp, &error) == 0) {
574 ret = krb5_error_from_rd_error(context, &error, in_creds);
575 krb5_free_error_contents(context, &error);
576 } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
577 ret = KRB5KRB_AP_ERR_V4_REPLY;
578 krb5_clear_error_message(context);
579 } else {
580 ret = KRB5KRB_AP_ERR_MSG_TYPE;
581 krb5_clear_error_message(context);
582 }
583
584 out:
585 if (second_ticket == &second_ticket_data)
586 free_Ticket(&second_ticket_data);
587 free_METHOD_DATA(&padata);
588 krb5_data_free(&resp);
589 krb5_data_free(&enc);
590 if(subkey)
591 krb5_free_keyblock(context, subkey);
592 return ret;
593
594 }
595
596 /*
597 * same as above, just get local addresses first if the krbtgt have
598 * them and the realm is not addressless
599 */
600
601 static krb5_error_code
602 get_cred_kdc_address(krb5_context context,
603 krb5_ccache id,
604 krb5_kdc_flags flags,
605 krb5_addresses *addrs,
606 krb5_creds *in_creds,
607 krb5_creds *krbtgt,
608 krb5_principal impersonate_principal,
609 Ticket *second_ticket,
610 krb5_creds *out_creds)
611 {
612 krb5_error_code ret;
613 krb5_addresses addresses = { 0, NULL };
614
615 /*
616 * Inherit the address-ness of the krbtgt if the address is not
617 * specified.
618 */
619
620 if (addrs == NULL && krbtgt->addresses.len != 0) {
621 krb5_boolean noaddr;
622
623 krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
624 "no-addresses", FALSE, &noaddr);
625
626 if (!noaddr) {
627 krb5_get_all_client_addrs(context, &addresses);
628 /* XXX this sucks. */
629 addrs = &addresses;
630 if(addresses.len == 0)
631 addrs = NULL;
632 }
633 }
634 ret = get_cred_kdc(context, id, flags, addrs, in_creds,
635 krbtgt, impersonate_principal,
636 second_ticket, out_creds);
637 krb5_free_addresses(context, &addresses);
638 return ret;
639 }
640
641 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
642 krb5_get_kdc_cred(krb5_context context,
643 krb5_ccache id,
644 krb5_kdc_flags flags,
645 krb5_addresses *addresses,
646 Ticket *second_ticket,
647 krb5_creds *in_creds,
648 krb5_creds **out_creds
649 )
650 {
651 krb5_error_code ret;
652 krb5_creds *krbtgt;
653
654 *out_creds = calloc(1, sizeof(**out_creds));
655 if(*out_creds == NULL)
656 return krb5_enomem(context);
657 ret = _krb5_get_krbtgt (context,
658 id,
659 in_creds->server->realm,
660 &krbtgt);
661 if(ret) {
662 free(*out_creds);
663 *out_creds = NULL;
664 return ret;
665 }
666 ret = get_cred_kdc(context, id, flags, addresses,
667 in_creds, krbtgt, NULL, NULL, *out_creds);
668 krb5_free_creds (context, krbtgt);
669 if(ret) {
670 free(*out_creds);
671 *out_creds = NULL;
672 }
673 return ret;
674 }
675
676 static int
677 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
678 {
679 krb5_error_code ret;
680 char *str;
681
682 ret = krb5_unparse_name(context, p, &str);
683 if(ret) {
684 krb5_clear_error_message(context);
685 return code;
686 }
687 krb5_set_error_message(context, code,
688 N_("Matching credential (%s) not found", ""), str);
689 free(str);
690 return code;
691 }
692
693 static krb5_error_code
694 find_cred(krb5_context context,
695 krb5_ccache id,
696 krb5_principal server,
697 krb5_creds **tgts,
698 krb5_creds *out_creds)
699 {
700 krb5_error_code ret;
701 krb5_creds mcreds;
702
703 krb5_cc_clear_mcred(&mcreds);
704 mcreds.server = server;
705 krb5_timeofday(context, &mcreds.times.endtime);
706 ret = krb5_cc_retrieve_cred(context, id,
707 KRB5_TC_DONT_MATCH_REALM |
708 KRB5_TC_MATCH_TIMES,
709 &mcreds, out_creds);
710 if(ret == 0)
711 return 0;
712 while(tgts && *tgts){
713 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
714 &mcreds, *tgts)){
715 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
716 return ret;
717 }
718 tgts++;
719 }
720 return not_found(context, server, KRB5_CC_NOTFOUND);
721 }
722
723 static krb5_error_code
724 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
725 {
726 int i;
727 krb5_error_code ret;
728 krb5_creds **tmp = *tgts;
729
730 for(i = 0; tmp && tmp[i]; i++); /* XXX */
731 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
732 if(tmp == NULL)
733 return krb5_enomem(context);
734 *tgts = tmp;
735 ret = krb5_copy_creds(context, tkt, &tmp[i]);
736 tmp[i+1] = NULL;
737 return ret;
738 }
739
740 static krb5_error_code
741 get_cred_kdc_capath_worker(krb5_context context,
742 krb5_kdc_flags flags,
743 krb5_ccache ccache,
744 krb5_creds *in_creds,
745 krb5_const_realm try_realm,
746 krb5_principal impersonate_principal,
747 Ticket *second_ticket,
748 krb5_creds **out_creds,
749 krb5_creds ***ret_tgts)
750 {
751 krb5_error_code ret;
752 krb5_creds *tgt = NULL;
753 krb5_creds tmp_creds;
754 krb5_const_realm client_realm, server_realm;
755 int ok_as_delegate = 1;
756
757 *out_creds = calloc(1, sizeof(**out_creds));
758 if (*out_creds == NULL)
759 return krb5_enomem(context);
760
761 memset(&tmp_creds, 0, sizeof(tmp_creds));
762
763 client_realm = krb5_principal_get_realm(context, in_creds->client);
764 server_realm = krb5_principal_get_realm(context, in_creds->server);
765 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
766 if (ret)
767 goto out;
768
769 ret = krb5_make_principal(context,
770 &tmp_creds.server,
771 try_realm,
772 KRB5_TGS_NAME,
773 server_realm,
774 NULL);
775 if (ret)
776 goto out;
777
778 {
779 krb5_creds tgts;
780
781 /*
782 * If we have krbtgt/server_realm@try_realm cached, use it and we're
783 * done.
784 */
785 ret = find_cred(context, ccache, tmp_creds.server,
786 *ret_tgts, &tgts);
787 if (ret == 0) {
788 /* only allow implicit ok_as_delegate if the realm is the clients realm */
789 if (strcmp(try_realm, client_realm) != 0
790 || strcmp(try_realm, server_realm) != 0) {
791 ok_as_delegate = tgts.flags.b.ok_as_delegate;
792 }
793
794 ret = get_cred_kdc_address(context, ccache, flags, NULL,
795 in_creds, &tgts,
796 impersonate_principal,
797 second_ticket,
798 *out_creds);
799 if (ret == 0
800 && !krb5_principal_compare(context, in_creds->server,
801 (*out_creds)->server)) {
802 krb5_free_cred_contents(context, *out_creds);
803 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
804 }
805 if (ret == 0 && ok_as_delegate == 0)
806 (*out_creds)->flags.b.ok_as_delegate = 0;
807
808 krb5_free_cred_contents(context, &tgts);
809 goto out;
810 }
811 }
812
813 if (krb5_realm_compare(context, in_creds->client, in_creds->server)) {
814 ret = not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
815 goto out;
816 }
817
818 /*
819 * XXX This can loop forever, plus we recurse, so we can't just keep a
820 * count here. The count would have to get passed around by reference.
821 *
822 * The KDCs check for transit loops for us, and capath data is finite, so
823 * in fact we'll fall out of this loop at some point. We should do our own
824 * transit loop checking (like get_cred_kdc_referral()), and we should
825 * impose a max number of iterations altogether. But barring malicious or
826 * broken KDCs, this is good enough.
827 */
828 while (1) {
829 heim_general_string tgt_inst;
830
831 ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds,
832 NULL, NULL, &tgt, ret_tgts);
833 if (ret)
834 goto out;
835
836 /*
837 * if either of the chain or the ok_as_delegate was stripped
838 * by the kdc, make sure we strip it too.
839 */
840 if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
841 ok_as_delegate = 0;
842 tgt->flags.b.ok_as_delegate = 0;
843 }
844
845 ret = add_cred(context, tgt, ret_tgts);
846 if (ret)
847 goto out;
848 tgt_inst = tgt->server->name.name_string.val[1];
849 if (strcmp(tgt_inst, server_realm) == 0)
850 break;
851 krb5_free_principal(context, tmp_creds.server);
852 tmp_creds.server = NULL;
853 ret = krb5_make_principal(context, &tmp_creds.server,
854 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
855 if (ret)
856 goto out;
857 ret = krb5_free_creds(context, tgt);
858 tgt = NULL;
859 if (ret)
860 goto out;
861 }
862
863 ret = get_cred_kdc_address (context, ccache, flags, NULL,
864 in_creds, tgt, impersonate_principal,
865 second_ticket, *out_creds);
866
867 out:
868 if (ret) {
869 free (*out_creds);
870 *out_creds = NULL;
871 }
872 if (tmp_creds.server)
873 krb5_free_principal(context, tmp_creds.server);
874 if (tmp_creds.client)
875 krb5_free_principal(context, tmp_creds.client);
876 if (tgt)
877 krb5_free_creds(context, tgt);
878 return ret;
879 }
880
881 /*
882 get_cred(server)
883 creds = cc_get_cred(server)
884 if(creds) return creds
885 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
886 if(tgt)
887 return get_cred_tgt(server, tgt)
888 if(client_realm == server_realm)
889 return NULL
890 tgt = get_cred(krbtgt/server_realm@client_realm)
891 while(tgt_inst != server_realm)
892 tgt = get_cred(krbtgt/server_realm@tgt_inst)
893 return get_cred_tgt(server, tgt)
894 */
895
896 static krb5_error_code
897 get_cred_kdc_capath(krb5_context context,
898 krb5_kdc_flags flags,
899 krb5_ccache ccache,
900 krb5_creds *in_creds,
901 krb5_principal impersonate_principal,
902 Ticket *second_ticket,
903 krb5_creds **out_creds,
904 krb5_creds ***ret_tgts)
905 {
906 krb5_error_code ret;
907 krb5_const_realm client_realm, server_realm, try_realm;
908
909 client_realm = krb5_principal_get_realm(context, in_creds->client);
910 server_realm = krb5_principal_get_realm(context, in_creds->server);
911
912 try_realm = client_realm;
913 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds, try_realm,
914 impersonate_principal, second_ticket, out_creds,
915 ret_tgts);
916
917 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
918 try_realm = krb5_config_get_string(context, NULL, "capaths",
919 client_realm, server_realm, NULL);
920
921 if (try_realm != NULL && strcmp(try_realm, client_realm)) {
922 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds,
923 try_realm, impersonate_principal,
924 second_ticket, out_creds, ret_tgts);
925 }
926 }
927
928 return ret;
929 }
930
931 /*
932 * Get a service ticket from a KDC by chasing referrals from a start realm.
933 *
934 * All referral TGTs produced in the process are thrown away when we're done.
935 * We don't store them, and we don't allow other search mechanisms (capaths) to
936 * use referral TGTs produced here.
937 */
938 static krb5_error_code
939 get_cred_kdc_referral(krb5_context context,
940 krb5_kdc_flags flags,
941 krb5_ccache ccache,
942 krb5_creds *in_creds,
943 krb5_principal impersonate_principal,
944 Ticket *second_ticket,
945 krb5_creds **out_creds)
946 {
947 krb5_const_realm client_realm;
948 krb5_error_code ret;
949 krb5_creds tgt, referral, ticket;
950 krb5_creds **referral_tgts = NULL; /* used for loop detection */
951 int loop = 0;
952 int ok_as_delegate = 1;
953 size_t i;
954
955 if (in_creds->server->name.name_string.len < 2 && !flags.b.canonicalize) {
956 krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED,
957 N_("Name too short to do referals, skipping", ""));
958 return KRB5KDC_ERR_PATH_NOT_ACCEPTED;
959 }
960
961 memset(&tgt, 0, sizeof(tgt));
962 memset(&ticket, 0, sizeof(ticket));
963
964 flags.b.canonicalize = 1;
965
966 *out_creds = NULL;
967
968 client_realm = krb5_principal_get_realm(context, in_creds->client);
969
970 /* find tgt for the clients base realm */
971 {
972 krb5_principal tgtname;
973
974 ret = krb5_make_principal(context, &tgtname,
975 client_realm,
976 KRB5_TGS_NAME,
977 client_realm,
978 NULL);
979 if(ret)
980 return ret;
981
982 ret = find_cred(context, ccache, tgtname, NULL, &tgt);
983 krb5_free_principal(context, tgtname);
984 if (ret)
985 return ret;
986 }
987
988 referral = *in_creds;
989 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
990 if (ret) {
991 krb5_free_cred_contents(context, &tgt);
992 return ret;
993 }
994 ret = krb5_principal_set_realm(context, referral.server, client_realm);
995 if (ret) {
996 krb5_free_cred_contents(context, &tgt);
997 krb5_free_principal(context, referral.server);
998 return ret;
999 }
1000
1001 while (loop++ < 17) {
1002 krb5_creds **tickets;
1003 krb5_creds mcreds;
1004 char *referral_realm;
1005
1006 /* Use cache if we are not doing impersonation or contrained deleg */
1007 if (impersonate_principal == NULL || flags.b.constrained_delegation) {
1008 krb5_cc_clear_mcred(&mcreds);
1009 mcreds.server = referral.server;
1010 krb5_timeofday(context, &mcreds.times.endtime);
1011 ret = krb5_cc_retrieve_cred(context, ccache, KRB5_TC_MATCH_TIMES,
1012 &mcreds, &ticket);
1013 } else
1014 ret = EINVAL;
1015
1016 if (ret) {
1017 ret = get_cred_kdc_address(context, ccache, flags, NULL,
1018 &referral, &tgt, impersonate_principal,
1019 second_ticket, &ticket);
1020 if (ret)
1021 goto out;
1022 }
1023
1024 /* Did we get the right ticket ? */
1025 if (krb5_principal_compare_any_realm(context,
1026 referral.server,
1027 ticket.server))
1028 break;
1029
1030 if (!krb5_principal_is_krbtgt(context, ticket.server)) {
1031 krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
1032 N_("Got back an non krbtgt "
1033 "ticket referrals", ""));
1034 ret = KRB5KRB_AP_ERR_NOT_US;
1035 goto out;
1036 }
1037
1038 referral_realm = ticket.server->name.name_string.val[1];
1039
1040 /* check that there are no referrals loops */
1041 tickets = referral_tgts;
1042
1043 krb5_cc_clear_mcred(&mcreds);
1044 mcreds.server = ticket.server;
1045
1046 while(tickets && *tickets){
1047 if(krb5_compare_creds(context,
1048 KRB5_TC_DONT_MATCH_REALM,
1049 &mcreds,
1050 *tickets))
1051 {
1052 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1053 N_("Referral from %s "
1054 "loops back to realm %s", ""),
1055 tgt.server->realm,
1056 referral_realm);
1057 ret = KRB5_GET_IN_TKT_LOOP;
1058 goto out;
1059 }
1060 tickets++;
1061 }
1062
1063 /*
1064 * if either of the chain or the ok_as_delegate was stripped
1065 * by the kdc, make sure we strip it too.
1066 */
1067
1068 if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
1069 ok_as_delegate = 0;
1070 ticket.flags.b.ok_as_delegate = 0;
1071 }
1072
1073 ret = add_cred(context, &ticket, &referral_tgts);
1074 if (ret)
1075 goto out;
1076
1077 /* try realm in the referral */
1078 ret = krb5_principal_set_realm(context,
1079 referral.server,
1080 referral_realm);
1081 krb5_free_cred_contents(context, &tgt);
1082 tgt = ticket;
1083 memset(&ticket, 0, sizeof(ticket));
1084 if (ret)
1085 goto out;
1086 }
1087
1088 ret = krb5_copy_creds(context, &ticket, out_creds);
1089
1090 out:
1091 for (i = 0; referral_tgts && referral_tgts[i]; i++)
1092 krb5_free_creds(context, referral_tgts[i]);
1093 free(referral_tgts);
1094 krb5_free_principal(context, referral.server);
1095 krb5_free_cred_contents(context, &tgt);
1096 krb5_free_cred_contents(context, &ticket);
1097 return ret;
1098 }
1099
1100
1101 /*
1102 * Glue function between referrals version and old client chasing
1103 * codebase.
1104 */
1105
1106 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1107 _krb5_get_cred_kdc_any(krb5_context context,
1108 krb5_kdc_flags flags,
1109 krb5_ccache ccache,
1110 krb5_creds *in_creds,
1111 krb5_principal impersonate_principal,
1112 Ticket *second_ticket,
1113 krb5_creds **out_creds,
1114 krb5_creds ***ret_tgts)
1115 {
1116 krb5_error_code ret;
1117 krb5_deltat offset;
1118
1119 ret = krb5_cc_get_kdc_offset(context, ccache, &offset);
1120 if (ret) {
1121 context->kdc_sec_offset = offset;
1122 context->kdc_usec_offset = 0;
1123 }
1124
1125 /* Try referrals */
1126 ret = get_cred_kdc_referral(context,
1127 flags,
1128 ccache,
1129 in_creds,
1130 impersonate_principal,
1131 second_ticket,
1132 out_creds);
1133
1134 if (ret == 0 || flags.b.canonicalize)
1135 return ret;
1136
1137 /* Try capaths */
1138 return get_cred_kdc_capath(context,
1139 flags,
1140 ccache,
1141 in_creds,
1142 impersonate_principal,
1143 second_ticket,
1144 out_creds,
1145 ret_tgts);
1146 }
1147
1148 static krb5_error_code
1149 check_cc(krb5_context context, krb5_flags options, krb5_ccache ccache,
1150 krb5_creds *in_creds, krb5_creds *out_creds)
1151 {
1152 krb5_error_code ret;
1153 krb5_timestamp now;
1154 krb5_times save_times;
1155
1156 save_times = in_creds->times;
1157
1158 krb5_timeofday(context, &now);
1159
1160 if (!(options & KRB5_GC_EXPIRED_OK) &&
1161 in_creds->times.endtime < now) {
1162 in_creds->times.renew_till = 0;
1163 krb5_timeofday(context, &in_creds->times.endtime);
1164 options |= KRB5_TC_MATCH_TIMES;
1165 }
1166 ret = krb5_cc_retrieve_cred(context, ccache,
1167 (options &
1168 (KRB5_TC_MATCH_KEYTYPE |
1169 KRB5_TC_MATCH_TIMES)),
1170 in_creds, out_creds);
1171
1172 in_creds->times = save_times;
1173 return ret;
1174 }
1175
1176 static void
1177 store_cred(krb5_context context, krb5_ccache ccache,
1178 krb5_const_principal server_princ, krb5_creds *creds)
1179 {
1180 krb5_error_code ret;
1181 krb5_principal tmp_princ = creds->server;
1182 krb5_principal p;
1183
1184 krb5_cc_store_cred(context, ccache, creds);
1185 if (strcmp(server_princ->realm, "") != 0)
1186 return;
1187
1188 ret = krb5_copy_principal(context, server_princ, &p);
1189 if (ret)
1190 return;
1191 if (p->name.name_type == KRB5_NT_SRV_HST_NEEDS_CANON)
1192 p->name.name_type = KRB5_NT_SRV_HST;
1193 creds->server = p;
1194 krb5_cc_store_cred(context, ccache, creds);
1195 creds->server = tmp_princ;
1196 krb5_free_principal(context, p);
1197 }
1198
1199
1200 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1201 krb5_get_credentials_with_flags(krb5_context context,
1202 krb5_flags options,
1203 krb5_kdc_flags flags,
1204 krb5_ccache ccache,
1205 krb5_creds *in_creds,
1206 krb5_creds **out_creds)
1207 {
1208 krb5_error_code ret;
1209 krb5_name_canon_iterator name_canon_iter = NULL;
1210 krb5_name_canon_rule_options rule_opts;
1211 krb5_creds **tgts;
1212 krb5_creds *try_creds;
1213 krb5_creds *res_creds;
1214 int i;
1215
1216 if (in_creds->session.keytype) {
1217 ret = krb5_enctype_valid(context, in_creds->session.keytype);
1218 if (ret)
1219 return ret;
1220 options |= KRB5_TC_MATCH_KEYTYPE;
1221 }
1222
1223 *out_creds = NULL;
1224 res_creds = calloc(1, sizeof(*res_creds));
1225 if (res_creds == NULL)
1226 return krb5_enomem(context);
1227
1228 if (in_creds->server->name.name_type == KRB5_NT_SRV_HST_NEEDS_CANON) {
1229 ret = check_cc(context, options, ccache, in_creds, res_creds);
1230 if (ret == 0) {
1231 *out_creds = res_creds;
1232 return 0;
1233 }
1234 }
1235
1236 ret = krb5_name_canon_iterator_start(context, NULL, in_creds,
1237 &name_canon_iter);
1238 if (ret)
1239 return ret;
1240
1241 next_rule:
1242 krb5_free_cred_contents(context, res_creds);
1243 memset(res_creds, 0, sizeof (*res_creds));
1244 ret = krb5_name_canon_iterate_creds(context, &name_canon_iter, &try_creds,
1245 &rule_opts);
1246 if (ret)
1247 goto out;
1248 if (name_canon_iter == NULL) {
1249 if (options & KRB5_GC_CACHED)
1250 ret = KRB5_CC_NOTFOUND;
1251 else
1252 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1253 goto out;
1254 }
1255
1256 ret = check_cc(context, options, ccache, try_creds, res_creds);
1257 if (ret == 0) {
1258 *out_creds = res_creds;
1259 goto out;
1260 } else if(ret != KRB5_CC_END) {
1261 goto out;
1262 }
1263 if(options & KRB5_GC_CACHED)
1264 goto next_rule;
1265
1266 if(options & KRB5_GC_USER_USER)
1267 flags.b.enc_tkt_in_skey = 1;
1268 if (flags.b.enc_tkt_in_skey)
1269 options |= KRB5_GC_NO_STORE;
1270
1271 tgts = NULL;
1272 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1273 try_creds, NULL, NULL, out_creds, &tgts);
1274 for (i = 0; tgts && tgts[i]; i++) {
1275 if ((options & KRB5_GC_NO_STORE) == 0)
1276 krb5_cc_store_cred(context, ccache, tgts[i]);
1277 krb5_free_creds(context, tgts[i]);
1278 }
1279 free(tgts);
1280 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN &&
1281 !(rule_opts & KRB5_NCRO_SECURE))
1282 goto next_rule;
1283
1284 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1285 store_cred(context, ccache, in_creds->server, *out_creds);
1286
1287 out:
1288 krb5_free_name_canon_iterator(context, name_canon_iter);
1289 if (ret) {
1290 krb5_free_creds(context, res_creds);
1291 return not_found(context, in_creds->server, ret);
1292 }
1293 return 0;
1294 }
1295
1296 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1297 krb5_get_credentials(krb5_context context,
1298 krb5_flags options,
1299 krb5_ccache ccache,
1300 krb5_creds *in_creds,
1301 krb5_creds **out_creds)
1302 {
1303 krb5_kdc_flags flags;
1304 flags.i = 0;
1305 return krb5_get_credentials_with_flags(context, options, flags,
1306 ccache, in_creds, out_creds);
1307 }
1308
1309 struct krb5_get_creds_opt_data {
1310 krb5_principal self;
1311 krb5_flags options;
1312 krb5_enctype enctype;
1313 Ticket *ticket;
1314 };
1315
1316
1317 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1318 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1319 {
1320 *opt = calloc(1, sizeof(**opt));
1321 if (*opt == NULL)
1322 return krb5_enomem(context);
1323 return 0;
1324 }
1325
1326 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1327 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1328 {
1329 if (opt->self)
1330 krb5_free_principal(context, opt->self);
1331 if (opt->ticket) {
1332 free_Ticket(opt->ticket);
1333 free(opt->ticket);
1334 }
1335 memset(opt, 0, sizeof(*opt));
1336 free(opt);
1337 }
1338
1339 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1340 krb5_get_creds_opt_set_options(krb5_context context,
1341 krb5_get_creds_opt opt,
1342 krb5_flags options)
1343 {
1344 opt->options = options;
1345 }
1346
1347 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1348 krb5_get_creds_opt_add_options(krb5_context context,
1349 krb5_get_creds_opt opt,
1350 krb5_flags options)
1351 {
1352 opt->options |= options;
1353 }
1354
1355 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1356 krb5_get_creds_opt_set_enctype(krb5_context context,
1357 krb5_get_creds_opt opt,
1358 krb5_enctype enctype)
1359 {
1360 opt->enctype = enctype;
1361 }
1362
1363 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1364 krb5_get_creds_opt_set_impersonate(krb5_context context,
1365 krb5_get_creds_opt opt,
1366 krb5_const_principal self)
1367 {
1368 if (opt->self)
1369 krb5_free_principal(context, opt->self);
1370 return krb5_copy_principal(context, self, &opt->self);
1371 }
1372
1373 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1374 krb5_get_creds_opt_set_ticket(krb5_context context,
1375 krb5_get_creds_opt opt,
1376 const Ticket *ticket)
1377 {
1378 if (opt->ticket) {
1379 free_Ticket(opt->ticket);
1380 free(opt->ticket);
1381 opt->ticket = NULL;
1382 }
1383 if (ticket) {
1384 krb5_error_code ret;
1385
1386 opt->ticket = malloc(sizeof(*ticket));
1387 if (opt->ticket == NULL)
1388 return krb5_enomem(context);
1389 ret = copy_Ticket(ticket, opt->ticket);
1390 if (ret) {
1391 free(opt->ticket);
1392 opt->ticket = NULL;
1393 krb5_set_error_message(context, ret,
1394 N_("malloc: out of memory", ""));
1395 return ret;
1396 }
1397 }
1398 return 0;
1399 }
1400
1401
1402 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1403 krb5_get_creds(krb5_context context,
1404 krb5_get_creds_opt opt,
1405 krb5_ccache ccache,
1406 krb5_const_principal inprinc,
1407 krb5_creds **out_creds)
1408 {
1409 krb5_kdc_flags flags;
1410 krb5_flags options;
1411 krb5_creds in_creds;
1412 krb5_error_code ret;
1413 krb5_creds **tgts;
1414 krb5_creds *try_creds;
1415 krb5_creds *res_creds;
1416 krb5_name_canon_iterator name_canon_iter = NULL;
1417 krb5_name_canon_rule_options rule_opts;
1418 int i;
1419
1420 if (opt && opt->enctype) {
1421 ret = krb5_enctype_valid(context, opt->enctype);
1422 if (ret)
1423 return ret;
1424 }
1425
1426 memset(&in_creds, 0, sizeof(in_creds));
1427 in_creds.server = rk_UNCONST(inprinc);
1428
1429 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1430 if (ret)
1431 return ret;
1432
1433 if (opt)
1434 options = opt->options;
1435 else
1436 options = 0;
1437 flags.i = 0;
1438
1439 *out_creds = NULL;
1440 res_creds = calloc(1, sizeof(*res_creds));
1441 if (res_creds == NULL) {
1442 krb5_free_principal(context, in_creds.client);
1443 return krb5_enomem(context);
1444 }
1445
1446 if (opt && opt->enctype) {
1447 in_creds.session.keytype = opt->enctype;
1448 options |= KRB5_TC_MATCH_KEYTYPE;
1449 }
1450
1451 /* Check for entry in ccache */
1452 if (inprinc->name.name_type == KRB5_NT_SRV_HST_NEEDS_CANON) {
1453 ret = check_cc(context, options, ccache, &in_creds, res_creds);
1454 if (ret == 0) {
1455 *out_creds = res_creds;
1456 goto out;
1457 }
1458 }
1459
1460 ret = krb5_name_canon_iterator_start(context, NULL, &in_creds,
1461 &name_canon_iter);
1462 if (ret)
1463 goto out;
1464
1465 next_rule:
1466 ret = krb5_name_canon_iterate_creds(context, &name_canon_iter, &try_creds,
1467 &rule_opts);
1468 if (ret)
1469 return ret;
1470 if (name_canon_iter == NULL) {
1471 if (options & KRB5_GC_CACHED)
1472 ret = KRB5_CC_NOTFOUND;
1473 else
1474 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1475 goto out;
1476 }
1477 ret = check_cc(context, options, ccache, try_creds, res_creds);
1478 if (ret == 0) {
1479 *out_creds = res_creds;
1480 goto out;
1481 } else if(ret != KRB5_CC_END) {
1482 goto out;
1483 }
1484 if(options & KRB5_GC_CACHED)
1485 goto next_rule;
1486
1487 if(rule_opts & KRB5_NCRO_USE_REFERRALS)
1488 flags.b.canonicalize = 1;
1489 else if(rule_opts & KRB5_NCRO_NO_REFERRALS)
1490 flags.b.canonicalize = 0;
1491 else
1492 flags.b.canonicalize = (options & KRB5_GC_CANONICALIZE) ? 1 : 0;
1493 if(options & KRB5_GC_USER_USER) {
1494 flags.b.enc_tkt_in_skey = 1;
1495 options |= KRB5_GC_NO_STORE;
1496 }
1497 if (options & KRB5_GC_FORWARDABLE)
1498 flags.b.forwardable = 1;
1499 if (options & KRB5_GC_NO_TRANSIT_CHECK)
1500 flags.b.disable_transited_check = 1;
1501 if (options & KRB5_GC_CONSTRAINED_DELEGATION) {
1502 flags.b.request_anonymous = 1; /* XXX ARGH confusion */
1503 flags.b.constrained_delegation = 1;
1504 }
1505
1506 tgts = NULL;
1507 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1508 try_creds, opt ? opt->self : 0,
1509 opt ? opt->ticket : 0, out_creds,
1510 &tgts);
1511 for (i = 0; tgts && tgts[i]; i++) {
1512 if ((options & KRB5_GC_NO_STORE) == 0)
1513 krb5_cc_store_cred(context, ccache, tgts[i]);
1514 krb5_free_creds(context, tgts[i]);
1515 }
1516 free(tgts);
1517
1518 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN &&
1519 !(rule_opts & KRB5_NCRO_SECURE))
1520 goto next_rule;
1521
1522 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1523 store_cred(context, ccache, inprinc, *out_creds);
1524
1525 out:
1526 if (ret) {
1527 krb5_free_creds(context, res_creds);
1528 ret = not_found(context, inprinc, ret);
1529 }
1530 krb5_free_principal(context, in_creds.client);
1531 krb5_free_name_canon_iterator(context, name_canon_iter);
1532 _krb5_debug(context, 5, "krb5_get_creds: ret = %d", ret);
1533 return ret;
1534 }
1535
1536 /*
1537 *
1538 */
1539
1540 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1541 krb5_get_renewed_creds(krb5_context context,
1542 krb5_creds *creds,
1543 krb5_const_principal client,
1544 krb5_ccache ccache,
1545 const char *in_tkt_service)
1546 {
1547 krb5_error_code ret;
1548 krb5_kdc_flags flags;
1549 krb5_creds in, *template, *out = NULL;
1550
1551 memset(&in, 0, sizeof(in));
1552 memset(creds, 0, sizeof(*creds));
1553
1554 ret = krb5_copy_principal(context, client, &in.client);
1555 if (ret)
1556 return ret;
1557
1558 if (in_tkt_service) {
1559 ret = krb5_parse_name(context, in_tkt_service, &in.server);
1560 if (ret) {
1561 krb5_free_principal(context, in.client);
1562 return ret;
1563 }
1564 } else {
1565 const char *realm = krb5_principal_get_realm(context, client);
1566
1567 ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1568 realm, NULL);
1569 if (ret) {
1570 krb5_free_principal(context, in.client);
1571 return ret;
1572 }
1573 }
1574
1575 flags.i = 0;
1576 flags.b.renewable = flags.b.renew = 1;
1577
1578 /*
1579 * Get template from old credential cache for the same entry, if
1580 * this failes, no worries.
1581 */
1582 ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
1583 if (ret == 0) {
1584 flags.b.forwardable = template->flags.b.forwardable;
1585 flags.b.proxiable = template->flags.b.proxiable;
1586 krb5_free_creds (context, template);
1587 }
1588
1589 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
1590 krb5_free_principal(context, in.client);
1591 krb5_free_principal(context, in.server);
1592 if (ret)
1593 return ret;
1594
1595 ret = krb5_copy_creds_contents(context, out, creds);
1596 krb5_free_creds(context, out);
1597
1598 return ret;
1599 }
Heimdal