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tests: Use here-doc kadmin in Java test
[heimdal.git] / lib / krb5 / get_cred.c
blob6e48846bcb3a8cfeb636bcc2e79c451ff8022be1
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 - 2010 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, struct krb5_fast_state *,
42 krb5_creds *, krb5_principal,
43 Ticket *, const char *, const char *,
44 krb5_creds **, krb5_creds ***);
45
46 /*
47 * Take the `body' and encode it into `padata' using the credentials
48 * in `creds'.
49 */
50
51 static krb5_error_code
52 make_pa_tgs_req(krb5_context context,
53 krb5_auth_context *ac,
54 KDC_REQ_BODY *body,
55 krb5_ccache ccache,
56 krb5_creds *creds,
57 krb5_data *tgs_req)
58 {
59 krb5_error_code ret;
60 krb5_data in_data;
61 size_t buf_size;
62 size_t len = 0;
63 uint8_t *buf;
64
65 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
66 if (ret)
67 return ret;
68
69 if(buf_size != len)
70 krb5_abortx(context, "internal error in ASN.1 encoder");
71
72 in_data.length = len;
73 in_data.data = buf;
74 ret = _krb5_mk_req_internal(context, ac, 0, &in_data,
75 creds, tgs_req,
76 KRB5_KU_TGS_REQ_AUTH_CKSUM,
77 KRB5_KU_TGS_REQ_AUTH);
78 free (buf);
79 return ret;
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 ret = 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 return ret;
127 } else {
128 req_body->enc_authorization_data = NULL;
129 return 0;
130 }
131 }
132
133 /*
134 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
135 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
136 * subkey in `subkey'.
137 */
138
139 static krb5_error_code
140 init_tgs_req (krb5_context context,
141 krb5_ccache ccache,
142 struct krb5_fast_state *state,
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 krb5_data tgs_req;
156
157 krb5_data_zero(&tgs_req);
158 memset(t, 0, sizeof(*t));
159
160 t->pvno = 5;
161 t->msg_type = krb_tgs_req;
162 if (in_creds->session.keytype) {
163 ALLOC_SEQ(&t->req_body.etype, 1);
164 if(t->req_body.etype.val == NULL) {
165 ret = krb5_enomem(context);
166 goto fail;
167 }
168 t->req_body.etype.val[0] = in_creds->session.keytype;
169 } else {
170 ret = _krb5_init_etype(context,
171 KRB5_PDU_TGS_REQUEST,
172 &t->req_body.etype.len,
173 &t->req_body.etype.val,
174 NULL);
175 }
176 if (ret)
177 goto fail;
178 t->req_body.addresses = addresses;
179 t->req_body.kdc_options = flags.b;
180 t->req_body.kdc_options.forwardable = krbtgt->flags.b.forwardable;
181 t->req_body.kdc_options.renewable = krbtgt->flags.b.renewable;
182 t->req_body.kdc_options.proxiable = krbtgt->flags.b.proxiable;
183 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
184 if (ret)
185 goto fail;
186 ALLOC(t->req_body.sname, 1);
187 if (t->req_body.sname == NULL) {
188 ret = krb5_enomem(context);
189 goto fail;
190 }
191
192 /* some versions of some code might require that the client be
193 present in TGS-REQs, but this is clearly against the spec */
194
195 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
196 if (ret)
197 goto fail;
198
199 if (krbtgt->times.starttime) {
200 ALLOC(t->req_body.from, 1);
201 if(t->req_body.from == NULL){
202 ret = krb5_enomem(context);
203 goto fail;
204 }
205 *t->req_body.from = in_creds->times.starttime;
206 }
207
208 /* req_body.till should be NULL if there is no endtime specified,
209 but old MIT code (like DCE secd) doesn't like that */
210 ALLOC(t->req_body.till, 1);
211 if(t->req_body.till == NULL){
212 ret = krb5_enomem(context);
213 goto fail;
214 }
215 *t->req_body.till = in_creds->times.endtime;
216
217 if (t->req_body.kdc_options.renewable && krbtgt->times.renew_till) {
218 ALLOC(t->req_body.rtime, 1);
219 if(t->req_body.rtime == NULL){
220 ret = krb5_enomem(context);
221 goto fail;
222 }
223 *t->req_body.rtime = in_creds->times.renew_till;
224 }
225
226 t->req_body.nonce = nonce;
227 if(second_ticket){
228 ALLOC(t->req_body.additional_tickets, 1);
229 if (t->req_body.additional_tickets == NULL) {
230 ret = krb5_enomem(context);
231 goto fail;
232 }
233 ALLOC_SEQ(t->req_body.additional_tickets, 1);
234 if (t->req_body.additional_tickets->val == NULL) {
235 ret = krb5_enomem(context);
236 goto fail;
237 }
238 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
239 if (ret)
240 goto fail;
241 }
242
243 ret = krb5_auth_con_init(context, &ac);
244 if(ret)
245 goto fail;
246
247 ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session);
248 if (ret)
249 goto fail;
250
251 if (state) {
252 krb5_data empty;
253
254 krb5_data_zero(&empty);
255 ret = krb5_auth_con_add_AuthorizationData(context, ac,
256 KRB5_AUTHDATA_FX_FAST_USED,
257 &empty);
258 if (ret)
259 goto fail;
260 }
261
262 ret = set_auth_data(context, &t->req_body,
263 &in_creds->authdata, ac->local_subkey);
264 if (ret)
265 goto fail;
266
267 ret = make_pa_tgs_req(context,
268 &ac,
269 &t->req_body,
270 ccache,
271 krbtgt,
272 &tgs_req);
273 if(ret)
274 goto fail;
275
276 /*
277 * Add KRB5_PADATA_TGS_REQ first
278 * followed by all others.
279 */
280
281 if (t->padata == NULL) {
282 ALLOC(t->padata, 1);
283 if (t->padata == NULL) {
284 ret = krb5_enomem(context);
285 goto fail;
286 }
287 }
288
289 ret = krb5_padata_add(context, t->padata, KRB5_PADATA_TGS_REQ,
290 tgs_req.data, tgs_req.length);
291 if (ret)
292 goto fail;
293
294 krb5_data_zero(&tgs_req);
295
296 {
297 size_t i;
298 for (i = 0; i < padata->len; i++) {
299 const PA_DATA *val1 = &padata->val[i];
300 PA_DATA val2;
301
302 ret = copy_PA_DATA(val1, &val2);
303 if (ret) {
304 krb5_set_error_message(context, ret,
305 N_("malloc: out of memory", ""));
306 goto fail;
307 }
308
309 ret = krb5_padata_add(context, t->padata,
310 val2.padata_type,
311 val2.padata_value.data,
312 val2.padata_value.length);
313 if (ret) {
314 free_PA_DATA(&val2);
315
316 krb5_set_error_message(context, ret,
317 N_("malloc: out of memory", ""));
318 goto fail;
319 }
320 }
321 }
322
323 if (state) {
324 state->armor_ac = ac;
325 ret = _krb5_fast_create_armor(context, state, NULL);
326 state->armor_ac = NULL;
327 if (ret)
328 goto fail;
329
330 ret = _krb5_fast_wrap_req(context, state, t);
331 if (ret)
332 goto fail;
333
334 /* Its ok if there is no fast in the TGS-REP, older heimdal only support it in the AS code path */
335 state->flags &= ~KRB5_FAST_EXPECTED;
336 }
337
338 ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
339 if (ret)
340 goto fail;
341
342 fail:
343 if (ac)
344 krb5_auth_con_free(context, ac);
345 if (ret) {
346 t->req_body.addresses = NULL;
347 free_TGS_REQ (t);
348 }
349 krb5_data_free(&tgs_req);
350
351 return ret;
352 }
353
354 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
355 _krb5_get_krbtgt(krb5_context context,
356 krb5_ccache id,
357 krb5_realm realm,
358 krb5_creds **cred)
359 {
360 krb5_error_code ret;
361 krb5_creds tmp_cred;
362
363 memset(&tmp_cred, 0, sizeof(tmp_cred));
364
365 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
366 if (ret)
367 return ret;
368
369 if (realm == NULL)
370 realm = tmp_cred.client->realm;
371
372 ret = krb5_make_principal(context,
373 &tmp_cred.server,
374 realm,
375 KRB5_TGS_NAME,
376 realm,
377 NULL);
378 if(ret) {
379 krb5_free_principal(context, tmp_cred.client);
380 return ret;
381 }
382 /*
383 * The forwardable TGT might not be the start TGT, in which case, it is
384 * generally, but not always already cached. Just in case, get it again if
385 * lost.
386 */
387 ret = krb5_get_credentials(context,
388 0,
389 id,
390 &tmp_cred,
391 cred);
392 krb5_free_principal(context, tmp_cred.client);
393 krb5_free_principal(context, tmp_cred.server);
394 if(ret)
395 return ret;
396 return 0;
397 }
398
399 static krb5_error_code
400 fast_tgs_strengthen_key(krb5_context context,
401 struct krb5_fast_state *state,
402 krb5_keyblock *reply_key,
403 krb5_keyblock *extract_key)
404 {
405 krb5_error_code ret;
406
407 if (state && state->strengthen_key) {
408 _krb5_debug(context, 5, "_krb5_fast_tgs_strengthen_key");
409
410 if (state->strengthen_key->keytype != reply_key->keytype) {
411 krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
412 N_("strengthen_key %d not same enctype as reply key %d", ""),
413 state->strengthen_key->keytype, reply_key->keytype);
414 return KRB5KRB_AP_ERR_MODIFIED;
415 }
416
417 ret = _krb5_fast_cf2(context,
418 state->strengthen_key,
419 "strengthenkey",
420 reply_key,
421 "replykey",
422 extract_key,
423 NULL);
424 if (ret)
425 return ret;
426 } else {
427 ret = krb5_copy_keyblock_contents(context, reply_key, extract_key);
428 if (ret)
429 return ret;
430 }
431
432 return 0;
433 }
434
435 /* DCE compatible decrypt proc */
436 static krb5_error_code KRB5_CALLCONV
437 decrypt_tkt_with_subkey (krb5_context context,
438 krb5_keyblock *key,
439 krb5_key_usage usage,
440 krb5_const_pointer skey,
441 krb5_kdc_rep *dec_rep)
442 {
443 struct krb5_decrypt_tkt_with_subkey_state *state;
444 krb5_error_code ret = 0;
445 krb5_data data;
446 size_t size;
447 krb5_crypto crypto;
448 krb5_keyblock extract_key;
449
450 state = (struct krb5_decrypt_tkt_with_subkey_state *)skey;
451
452 assert(usage == 0);
453
454 krb5_data_zero(&data);
455
456 /*
457 * start out with trying with subkey if we have one
458 */
459 if (state->subkey) {
460 ret = fast_tgs_strengthen_key(context, state->fast_state,
461 state->subkey, &extract_key);
462 if (ret)
463 return ret;
464
465 ret = krb5_crypto_init(context, &extract_key, 0, &crypto);
466 krb5_free_keyblock_contents(context, &extract_key);
467 if (ret)
468 return ret;
469 ret = krb5_decrypt_EncryptedData (context,
470 crypto,
471 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
472 &dec_rep->kdc_rep.enc_part,
473 &data);
474 /*
475 * If the is Windows 2000 DC, we need to retry with key usage
476 * 8 when doing ARCFOUR.
477 */
478 if (ret && state->subkey->keytype == ETYPE_ARCFOUR_HMAC_MD5) {
479 ret = krb5_decrypt_EncryptedData(context,
480 crypto,
481 8,
482 &dec_rep->kdc_rep.enc_part,
483 &data);
484 }
485 krb5_crypto_destroy(context, crypto);
486 }
487 if (state->subkey == NULL || ret) {
488 ret = fast_tgs_strengthen_key(context, state->fast_state, key, &extract_key);
489 if (ret)
490 return ret;
491
492 ret = krb5_crypto_init(context, key, 0, &crypto);
493 if (ret)
494 return ret;
495 ret = krb5_decrypt_EncryptedData (context,
496 crypto,
497 KRB5_KU_TGS_REP_ENC_PART_SESSION,
498 &dec_rep->kdc_rep.enc_part,
499 &data);
500 krb5_crypto_destroy(context, crypto);
501 }
502 if (ret)
503 return ret;
504
505 ret = decode_EncASRepPart(data.data,
506 data.length,
507 &dec_rep->enc_part,
508 &size);
509 if (ret)
510 ret = decode_EncTGSRepPart(data.data,
511 data.length,
512 &dec_rep->enc_part,
513 &size);
514 if (ret)
515 krb5_set_error_message(context, ret,
516 N_("Failed to decode encpart in ticket", ""));
517 krb5_data_free (&data);
518 return ret;
519 }
520
521 static krb5_error_code
522 get_cred_kdc(krb5_context context,
523 krb5_ccache id,
524 struct krb5_fast_state *fast_state,
525 krb5_kdc_flags flags,
526 krb5_addresses *addresses,
527 krb5_creds *in_creds,
528 krb5_creds *krbtgt,
529 krb5_principal impersonate_principal,
530 Ticket *second_ticket,
531 const char *kdc_hostname,
532 const char *sitename,
533 krb5_creds *out_creds)
534 {
535 TGS_REQ req;
536 krb5_data enc;
537 krb5_data resp;
538 krb5_kdc_rep rep;
539 krb5_error_code ret;
540 unsigned nonce;
541 krb5_keyblock *subkey = NULL;
542 size_t len = 0;
543 Ticket second_ticket_data;
544 METHOD_DATA padata;
545
546 memset(&rep, 0, sizeof(rep));
547 krb5_data_zero(&resp);
548 krb5_data_zero(&enc);
549 padata.val = NULL;
550 padata.len = 0;
551
552 krb5_generate_random_block(&nonce, sizeof(nonce));
553 nonce &= 0xffffffff;
554
555 if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
556 ret = decode_Ticket(in_creds->second_ticket.data,
557 in_creds->second_ticket.length,
558 &second_ticket_data, &len);
559 if(ret)
560 return ret;
561 second_ticket = &second_ticket_data;
562 }
563
564
565 if (impersonate_principal) {
566 krb5_crypto crypto;
567 PA_S4U2Self self;
568 krb5_data data;
569 void *buf;
570 size_t size = 0;
571
572 self.name = impersonate_principal->name;
573 self.realm = impersonate_principal->realm;
574 self.auth = estrdup("Kerberos");
575
576 ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
577 if (ret) {
578 free(self.auth);
579 goto out;
580 }
581
582 ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
583 if (ret) {
584 free(self.auth);
585 krb5_data_free(&data);
586 goto out;
587 }
588
589 ret = krb5_create_checksum(context,
590 crypto,
591 KRB5_KU_OTHER_CKSUM,
592 0,
593 data.data,
594 data.length,
595 &self.cksum);
596 krb5_crypto_destroy(context, crypto);
597 krb5_data_free(&data);
598 if (ret) {
599 free(self.auth);
600 goto out;
601 }
602
603 ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
604 free(self.auth);
605 free_Checksum(&self.cksum);
606 if (ret)
607 goto out;
608 if (len != size)
609 krb5_abortx(context, "internal asn1 error");
610
611 ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
612 if (ret)
613 goto out;
614 }
615
616 ret = init_tgs_req (context,
617 id,
618 fast_state,
619 addresses,
620 flags,
621 second_ticket,
622 in_creds,
623 krbtgt,
624 nonce,
625 &padata,
626 &subkey,
627 &req);
628 if (ret)
629 goto out;
630
631 ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
632 if (ret)
633 goto out;
634 if(enc.length != len)
635 krb5_abortx(context, "internal error in ASN.1 encoder");
636
637 /* don't free addresses */
638 req.req_body.addresses = NULL;
639 free_TGS_REQ(&req);
640
641 /*
642 * Send and receive
643 */
644 {
645 krb5_sendto_ctx stctx;
646 ret = krb5_sendto_ctx_alloc(context, &stctx);
647 if (ret)
648 return ret;
649 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
650
651 if (kdc_hostname)
652 krb5_sendto_set_hostname(context, stctx, kdc_hostname);
653 if (sitename)
654 krb5_sendto_set_sitename(context, stctx, sitename);
655
656 ret = krb5_sendto_context (context, stctx, &enc,
657 krbtgt->server->name.name_string.val[1],
658 &resp);
659 krb5_sendto_ctx_free(context, stctx);
660 }
661 if(ret)
662 goto out;
663
664 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
665 struct krb5_decrypt_tkt_with_subkey_state state;
666 unsigned eflags = 0;
667 krb5_data data;
668 size_t size;
669
670 ASN1_MALLOC_ENCODE(Ticket, data.data, data.length,
671 &rep.kdc_rep.ticket, &size, ret);
672 if (ret)
673 goto out;
674 heim_assert(data.length == size, "ASN.1 internal error");
675
676 ret = _krb5_fast_unwrap_kdc_rep(context, nonce, &data,
677 fast_state, &rep.kdc_rep);
678 krb5_data_free(&data);
679 if (ret)
680 goto out;
681
682 ret = krb5_copy_principal(context,
683 in_creds->client,
684 &out_creds->client);
685 if(ret)
686 goto out;
687 ret = krb5_copy_principal(context,
688 in_creds->server,
689 &out_creds->server);
690 if(ret)
691 goto out;
692 /* this should go someplace else */
693 out_creds->times.endtime = in_creds->times.endtime;
694
695 /* XXX should do better testing */
696 if (flags.b.cname_in_addl_tkt || impersonate_principal)
697 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
698 if (flags.b.request_anonymous)
699 eflags |= EXTRACT_TICKET_MATCH_ANON;
700
701 state.subkey = subkey;
702 state.fast_state = fast_state;
703
704 ret = _krb5_extract_ticket(context,
705 &rep,
706 out_creds,
707 &krbtgt->session,
708 NULL,
709 0,
710 &krbtgt->addresses,
711 nonce,
712 eflags,
713 NULL,
714 decrypt_tkt_with_subkey,
715 &state);
716 } else if(krb5_rd_error(context, &resp, &rep.error) == 0) {
717 METHOD_DATA md;
718
719 memset(&md, 0, sizeof(md));
720
721 if (rep.error.e_data) {
722 ret = decode_METHOD_DATA(rep.error.e_data->data,
723 rep.error.e_data->length,
724 &md, NULL);
725 if (ret) {
726 krb5_set_error_message(context, ret,
727 N_("Failed to decode METHOD-DATA", ""));
728 goto out;
729 }
730 }
731
732 ret = _krb5_fast_unwrap_error(context, nonce, fast_state, &md, &rep.error);
733 free_METHOD_DATA(&md);
734 if (ret)
735 goto out;
736
737 ret = krb5_error_from_rd_error(context, &rep.error, in_creds);
738
739 /* log the failure */
740 if (_krb5_have_debug(context, 5)) {
741 const char *str = krb5_get_error_message(context, ret);
742 _krb5_debug(context, 5, "parse_tgs_rep: KRB-ERROR %d/%s", ret, str);
743 krb5_free_error_message(context, str);
744 }
745 } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
746 ret = KRB5KRB_AP_ERR_V4_REPLY;
747 krb5_clear_error_message(context);
748 } else {
749 ret = KRB5KRB_AP_ERR_MSG_TYPE;
750 krb5_clear_error_message(context);
751 }
752
753 out:
754 krb5_free_kdc_rep(context, &rep);
755 if (second_ticket == &second_ticket_data)
756 free_Ticket(&second_ticket_data);
757 free_METHOD_DATA(&padata);
758 krb5_data_free(&resp);
759 krb5_data_free(&enc);
760 if(subkey)
761 krb5_free_keyblock(context, subkey);
762 return ret;
763
764 }
765
766 /*
767 * same as above, just get local addresses first if the krbtgt have
768 * them and the realm is not addressless
769 */
770
771 static krb5_error_code
772 get_cred_kdc_address(krb5_context context,
773 krb5_ccache id,
774 struct krb5_fast_state *fast_state,
775 krb5_kdc_flags flags,
776 krb5_addresses *addrs,
777 krb5_creds *in_creds,
778 krb5_creds *krbtgt,
779 krb5_principal impersonate_principal,
780 Ticket *second_ticket,
781 const char *kdc_hostname,
782 const char *sitename,
783 krb5_creds *out_creds)
784 {
785 krb5_error_code ret;
786 krb5_addresses addresses = { 0, NULL };
787
788 /*
789 * Inherit the address-ness of the krbtgt if the address is not
790 * specified.
791 */
792
793 if (addrs == NULL && krbtgt->addresses.len != 0) {
794 krb5_boolean noaddr;
795
796 krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
797 "no-addresses", FALSE, &noaddr);
798
799 if (!noaddr) {
800 ret = krb5_get_all_client_addrs(context, &addresses);
801 if (ret)
802 return ret;
803 /* XXX this sucks. */
804 addrs = &addresses;
805 if(addresses.len == 0)
806 addrs = NULL;
807 }
808 }
809 ret = get_cred_kdc(context, id, fast_state, flags, addrs,
810 in_creds, krbtgt, impersonate_principal,
811 second_ticket, kdc_hostname, sitename, out_creds);
812 krb5_free_addresses(context, &addresses);
813 return ret;
814 }
815
816 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
817 krb5_get_kdc_cred(krb5_context context,
818 krb5_ccache id,
819 krb5_kdc_flags flags,
820 krb5_addresses *addresses,
821 Ticket *second_ticket,
822 krb5_creds *in_creds,
823 krb5_creds **out_creds
824 )
825 {
826 krb5_error_code ret;
827 krb5_creds *krbtgt;
828 struct krb5_fast_state fast_state;
829
830 memset(&fast_state, 0, sizeof(fast_state));
831
832 *out_creds = calloc(1, sizeof(**out_creds));
833 if(*out_creds == NULL)
834 return krb5_enomem(context);
835 ret = _krb5_get_krbtgt (context,
836 id,
837 in_creds->server->realm,
838 &krbtgt);
839 if(ret) {
840 free(*out_creds);
841 *out_creds = NULL;
842 return ret;
843 }
844 ret = get_cred_kdc(context, id, &fast_state, flags,
845 addresses, in_creds, krbtgt,
846 NULL, NULL, NULL, NULL, *out_creds);
847 krb5_free_creds (context, krbtgt);
848 _krb5_fast_free(context, &fast_state);
849 if(ret) {
850 free(*out_creds);
851 *out_creds = NULL;
852 }
853 return ret;
854 }
855
856 static int
857 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
858 {
859 krb5_error_code ret;
860 char *str;
861 const char *err;
862
863 ret = krb5_unparse_name(context, p, &str);
864 if(ret) {
865 krb5_clear_error_message(context);
866 return code;
867 }
868 err = krb5_get_error_message(context, code);
869 krb5_set_error_message(context, code, N_("%s (%s)", ""), err, str);
870 krb5_free_error_message(context, err);
871 free(str);
872 return code;
873 }
874
875 static krb5_error_code
876 find_cred(krb5_context context,
877 krb5_ccache id,
878 krb5_principal server,
879 krb5_creds **tgts,
880 krb5_creds *out_creds)
881 {
882 krb5_error_code ret;
883 krb5_creds mcreds;
884
885 krb5_cc_clear_mcred(&mcreds);
886 mcreds.server = server;
887 krb5_timeofday(context, &mcreds.times.endtime);
888 ret = krb5_cc_retrieve_cred(context, id,
889 KRB5_TC_DONT_MATCH_REALM |
890 KRB5_TC_MATCH_TIMES,
891 &mcreds, out_creds);
892 if(ret == 0)
893 return 0;
894 while(tgts && *tgts){
895 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
896 &mcreds, *tgts)){
897 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
898 return ret;
899 }
900 tgts++;
901 }
902 return not_found(context, server, KRB5_CC_NOTFOUND);
903 }
904
905 static krb5_error_code
906 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
907 {
908 int i;
909 krb5_error_code ret;
910 krb5_creds **tmp = *tgts;
911
912 for(i = 0; tmp && tmp[i]; i++); /* XXX */
913 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
914 if(tmp == NULL)
915 return krb5_enomem(context);
916 *tgts = tmp;
917 ret = krb5_copy_creds(context, tkt, &tmp[i]);
918 tmp[i+1] = NULL;
919 return ret;
920 }
921
922 static krb5_error_code
923 get_cred_kdc_capath_worker(krb5_context context,
924 krb5_kdc_flags flags,
925 krb5_ccache ccache,
926 struct krb5_fast_state *fast_state,
927 krb5_creds *in_creds,
928 krb5_const_realm try_realm,
929 krb5_principal impersonate_principal,
930 Ticket *second_ticket,
931 const char *kdc_hostname,
932 const char *sitename,
933 krb5_creds **out_creds,
934 krb5_creds ***ret_tgts)
935 {
936 krb5_error_code ret;
937 krb5_creds *tgt = NULL;
938 krb5_creds tmp_creds;
939 krb5_const_realm client_realm, server_realm;
940 int ok_as_delegate = 1;
941
942 *out_creds = calloc(1, sizeof(**out_creds));
943 if (*out_creds == NULL)
944 return krb5_enomem(context);
945
946 memset(&tmp_creds, 0, sizeof(tmp_creds));
947
948 client_realm = krb5_principal_get_realm(context, in_creds->client);
949 server_realm = krb5_principal_get_realm(context, in_creds->server);
950 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
951 if (ret)
952 goto out;
953
954 ret = krb5_make_principal(context,
955 &tmp_creds.server,
956 try_realm,
957 KRB5_TGS_NAME,
958 server_realm,
959 NULL);
960 if (ret)
961 goto out;
962
963 {
964 krb5_creds tgts;
965
966 /*
967 * If we have krbtgt/server_realm@try_realm cached, use it and we're
968 * done.
969 */
970 ret = find_cred(context, ccache, tmp_creds.server,
971 *ret_tgts, &tgts);
972 if (ret == 0) {
973 /* only allow implicit ok_as_delegate if the realm is the clients realm */
974 if (strcmp(try_realm, client_realm) != 0
975 || strcmp(try_realm, server_realm) != 0) {
976 ok_as_delegate = tgts.flags.b.ok_as_delegate;
977 }
978
979 ret = get_cred_kdc_address(context, ccache, fast_state,
980 flags, NULL,
981 in_creds, &tgts,
982 impersonate_principal,
983 second_ticket,
984 kdc_hostname,
985 sitename,
986 *out_creds);
987 krb5_free_cred_contents(context, &tgts);
988 if (ret == 0 &&
989 !krb5_principal_compare(context, in_creds->server,
990 (*out_creds)->server)) {
991 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
992 }
993 if (ret == 0 && ok_as_delegate == 0)
994 (*out_creds)->flags.b.ok_as_delegate = 0;
995
996 goto out;
997 }
998 }
999
1000 if (krb5_realm_compare(context, in_creds->client, in_creds->server)) {
1001 ret = not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
1002 goto out;
1003 }
1004
1005 /*
1006 * XXX This can loop forever, plus we recurse, so we can't just keep a
1007 * count here. The count would have to get passed around by reference.
1008 *
1009 * The KDCs check for transit loops for us, and capath data is finite, so
1010 * in fact we'll fall out of this loop at some point. We should do our own
1011 * transit loop checking (like get_cred_kdc_referral()), and we should
1012 * impose a max number of iterations altogether. But barring malicious or
1013 * broken KDCs, this is good enough.
1014 */
1015 while (1) {
1016 heim_general_string tgt_inst;
1017
1018 ret = get_cred_kdc_capath(context, flags, ccache, fast_state,
1019 &tmp_creds, NULL, NULL,
1020 kdc_hostname, sitename,
1021 &tgt, ret_tgts);
1022 if (ret)
1023 goto out;
1024
1025 /*
1026 * if either of the chain or the ok_as_delegate was stripped
1027 * by the kdc, make sure we strip it too.
1028 */
1029 if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
1030 ok_as_delegate = 0;
1031 tgt->flags.b.ok_as_delegate = 0;
1032 }
1033
1034 ret = add_cred(context, tgt, ret_tgts);
1035 if (ret)
1036 goto out;
1037 tgt_inst = tgt->server->name.name_string.val[1];
1038 if (strcmp(tgt_inst, server_realm) == 0)
1039 break;
1040 krb5_free_principal(context, tmp_creds.server);
1041 tmp_creds.server = NULL;
1042 ret = krb5_make_principal(context, &tmp_creds.server,
1043 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
1044 if (ret)
1045 goto out;
1046 ret = krb5_free_creds(context, tgt);
1047 tgt = NULL;
1048 if (ret)
1049 goto out;
1050 }
1051
1052 ret = get_cred_kdc_address(context, ccache, fast_state, flags, NULL,
1053 in_creds, tgt, impersonate_principal,
1054 second_ticket, kdc_hostname, sitename, *out_creds);
1055 if (ret == 0 &&
1056 !krb5_principal_compare(context, in_creds->server,
1057 (*out_creds)->server)) {
1058 krb5_free_cred_contents(context, *out_creds);
1059 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1060 }
1061 if (ret == 0 && ok_as_delegate == 0)
1062 (*out_creds)->flags.b.ok_as_delegate = 0;
1063
1064 out:
1065 if (ret) {
1066 krb5_free_creds(context, *out_creds);
1067 *out_creds = NULL;
1068 }
1069 if (tmp_creds.server)
1070 krb5_free_principal(context, tmp_creds.server);
1071 if (tmp_creds.client)
1072 krb5_free_principal(context, tmp_creds.client);
1073 if (tgt)
1074 krb5_free_creds(context, tgt);
1075 return ret;
1076 }
1077
1078 /*
1079 get_cred(server)
1080 creds = cc_get_cred(server)
1081 if(creds) return creds
1082 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
1083 if(tgt)
1084 return get_cred_tgt(server, tgt)
1085 if(client_realm == server_realm)
1086 return NULL
1087 tgt = get_cred(krbtgt/server_realm@client_realm)
1088 while(tgt_inst != server_realm)
1089 tgt = get_cred(krbtgt/server_realm@tgt_inst)
1090 return get_cred_tgt(server, tgt)
1091 */
1092
1093 static krb5_error_code
1094 get_cred_kdc_capath(krb5_context context,
1095 krb5_kdc_flags flags,
1096 krb5_ccache ccache,
1097 struct krb5_fast_state *fast_state,
1098 krb5_creds *in_creds,
1099 krb5_principal impersonate_principal,
1100 Ticket *second_ticket,
1101 const char *kdc_hostname,
1102 const char *sitename,
1103 krb5_creds **out_creds,
1104 krb5_creds ***ret_tgts)
1105 {
1106 krb5_error_code ret;
1107 krb5_const_realm client_realm, server_realm, try_realm;
1108
1109 client_realm = krb5_principal_get_realm(context, in_creds->client);
1110 server_realm = krb5_principal_get_realm(context, in_creds->server);
1111
1112 try_realm = client_realm;
1113 ret = get_cred_kdc_capath_worker(context, flags, ccache, fast_state,
1114 in_creds, try_realm, impersonate_principal,
1115 second_ticket, kdc_hostname, sitename,
1116 out_creds, ret_tgts);
1117
1118 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
1119 try_realm = krb5_config_get_string(context, NULL, "capaths",
1120 client_realm, server_realm, NULL);
1121
1122 if (try_realm != NULL && strcmp(try_realm, client_realm) != 0) {
1123 ret = get_cred_kdc_capath_worker(context, flags, ccache, fast_state,
1124 in_creds, try_realm, impersonate_principal,
1125 second_ticket, kdc_hostname, sitename,
1126 out_creds, ret_tgts);
1127 }
1128 }
1129
1130 return ret;
1131 }
1132
1133 static krb5_boolean skip_referrals(krb5_principal server,
1134 krb5_kdc_flags *flags)
1135 {
1136 return server->name.name_string.len < 2 && !flags->b.canonicalize;
1137 }
1138
1139 /*
1140 * Get a service ticket from a KDC by chasing referrals from a start realm.
1141 *
1142 * All referral TGTs produced in the process are thrown away when we're done.
1143 * We don't store them, and we don't allow other search mechanisms (capaths) to
1144 * use referral TGTs produced here.
1145 */
1146 static krb5_error_code
1147 get_cred_kdc_referral(krb5_context context,
1148 krb5_kdc_flags flags,
1149 krb5_ccache ccache,
1150 struct krb5_fast_state *fast_state,
1151 krb5_creds *in_creds,
1152 krb5_principal impersonate_principal,
1153 Ticket *second_ticket,
1154 const char *kdc_hostname,
1155 const char *sitename,
1156 krb5_creds **out_creds)
1157 {
1158 krb5_realm start_realm = NULL;
1159 krb5_data config_start_realm;
1160 krb5_error_code ret;
1161 krb5_creds tgt, referral, ticket;
1162 krb5_creds **referral_tgts = NULL; /* used for loop detection */
1163 int loop = 0;
1164 int ok_as_delegate = 1;
1165 int want_tgt;
1166 size_t i;
1167
1168 if (skip_referrals(in_creds->server, &flags)) {
1169 krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED,
1170 N_("Name too short to do referals, skipping", ""));
1171 return KRB5KDC_ERR_PATH_NOT_ACCEPTED;
1172 }
1173
1174 memset(&tgt, 0, sizeof(tgt));
1175 memset(&ticket, 0, sizeof(ticket));
1176
1177 flags.b.canonicalize = 1;
1178
1179 *out_creds = NULL;
1180
1181
1182 ret = krb5_cc_get_config(context, ccache, NULL, "start_realm", &config_start_realm);
1183 if (ret == 0) {
1184 start_realm = strndup(config_start_realm.data, config_start_realm.length);
1185 krb5_data_free(&config_start_realm);
1186 } else {
1187 start_realm = strdup(krb5_principal_get_realm(context, in_creds->client));
1188 }
1189 if (start_realm == NULL)
1190 return krb5_enomem(context);
1191
1192 /* find tgt for the clients base realm */
1193 {
1194 krb5_principal tgtname;
1195
1196 ret = krb5_make_principal(context, &tgtname,
1197 start_realm,
1198 KRB5_TGS_NAME,
1199 start_realm,
1200 NULL);
1201 if (ret) {
1202 free(start_realm);
1203 return ret;
1204 }
1205
1206 ret = find_cred(context, ccache, tgtname, NULL, &tgt);
1207 krb5_free_principal(context, tgtname);
1208 if (ret) {
1209 free(start_realm);
1210 return ret;
1211 }
1212 }
1213
1214 /*
1215 * If the desired service principal service/host@REALM is not a TGT, start
1216 * by asking for a ticket for service/host@START_REALM and process referrals
1217 * from there.
1218 *
1219 * However, when we ask for a TGT, krbtgt/A@B, we're actually looking for a
1220 * path to realm B, so that we can explicitly obtain a ticket for krbtgt/A
1221 * from B, and not some other realm. Therefore, in this case our starting
1222 * point will be krbtgt/B@START_REALM. Only once we obtain a ticket for
1223 * krbtgt/B@some-transit, do we switch to requesting krbtgt/A@B on our
1224 * final request.
1225 */
1226 referral = *in_creds;
1227 want_tgt = in_creds->server->realm[0] != '\0' &&
1228 krb5_principal_is_krbtgt(context, in_creds->server);
1229 if (!want_tgt)
1230 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
1231 else
1232 ret = krb5_make_principal(context, &referral.server, start_realm,
1233 KRB5_TGS_NAME, in_creds->server->realm, NULL);
1234
1235 if (ret) {
1236 krb5_free_cred_contents(context, &tgt);
1237 free(start_realm);
1238 return ret;
1239 }
1240 if (!want_tgt)
1241 ret = krb5_principal_set_realm(context, referral.server, start_realm);
1242 free(start_realm);
1243 start_realm = NULL;
1244 if (ret) {
1245 krb5_free_cred_contents(context, &tgt);
1246 krb5_free_principal(context, referral.server);
1247 return ret;
1248 }
1249
1250 while (loop++ < 17) {
1251 krb5_creds **tickets;
1252 krb5_creds mcreds;
1253 char *referral_realm;
1254
1255 /* Use cache if we are not doing impersonation or contrained deleg */
1256 if (impersonate_principal == NULL && !flags.b.cname_in_addl_tkt) {
1257 krb5_cc_clear_mcred(&mcreds);
1258 mcreds.server = referral.server;
1259 krb5_timeofday(context, &mcreds.times.endtime);
1260 ret = krb5_cc_retrieve_cred(context, ccache, KRB5_TC_MATCH_TIMES,
1261 &mcreds, &ticket);
1262 } else
1263 ret = EINVAL;
1264
1265 if (ret) {
1266 ret = get_cred_kdc_address(context, ccache, fast_state, flags, NULL,
1267 &referral, &tgt, impersonate_principal,
1268 second_ticket, kdc_hostname, sitename, &ticket);
1269 if (ret)
1270 goto out;
1271 }
1272
1273 /*
1274 * Did we get the right ticket?
1275 *
1276 * If we weren't asking for a TGT, then we don't mind if we took a realm
1277 * change (referral.server has a referral realm, not necessarily the
1278 * original).
1279 *
1280 * However, if we were looking for a TGT (which wouldn't be the start
1281 * TGT, since that one must be in the ccache) then we actually want the
1282 * one from the realm we wanted, since otherwise a _referral_ will
1283 * confuse us and we will store that referral. In Heimdal we mostly
1284 * never ask krb5_get_cred*() for TGTs, but some sites have code to ask
1285 * for a ktbgt/REMOTE.REALM@REMOTE.REALM, and one could always use
1286 * kgetcred(1) to get here asking for a krbtgt/C@D and we need to handle
1287 * the case where last hop we get is krbtgt/C@B (in which case we must
1288 * stop so we don't beat up on B for the remaining tries).
1289 */
1290 if (!want_tgt &&
1291 krb5_principal_compare(context, referral.server, ticket.server))
1292 break;
1293
1294 if (!krb5_principal_is_krbtgt(context, ticket.server)) {
1295 krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
1296 N_("Got back an non krbtgt "
1297 "ticket referrals", ""));
1298 ret = KRB5KRB_AP_ERR_NOT_US;
1299 goto out;
1300 }
1301
1302 referral_realm = ticket.server->name.name_string.val[1];
1303
1304 /* check that there are no referrals loops */
1305 tickets = referral_tgts;
1306
1307 krb5_cc_clear_mcred(&mcreds);
1308 mcreds.server = ticket.server;
1309
1310 while (tickets && *tickets){
1311 if (krb5_compare_creds(context,
1312 KRB5_TC_DONT_MATCH_REALM,
1313 &mcreds,
1314 *tickets)) {
1315 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1316 N_("Referral from %s "
1317 "loops back to realm %s", ""),
1318 tgt.server->realm,
1319 referral_realm);
1320 ret = KRB5_GET_IN_TKT_LOOP;
1321 goto out;
1322 }
1323 tickets++;
1324 }
1325
1326 /*
1327 * if either of the chain or the ok_as_delegate was stripped
1328 * by the kdc, make sure we strip it too.
1329 */
1330
1331 if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
1332 ok_as_delegate = 0;
1333 ticket.flags.b.ok_as_delegate = 0;
1334 }
1335
1336 _krb5_debug(context, 6, "get_cred_kdc_referral: got referral "
1337 "to %s from %s", referral_realm, referral.server->realm);
1338 ret = add_cred(context, &ticket, &referral_tgts);
1339 if (ret)
1340 goto out;
1341
1342 /* try realm in the referral */
1343 if (!want_tgt || strcmp(referral_realm, in_creds->server->realm) != 0)
1344 ret = krb5_principal_set_realm(context,
1345 referral.server,
1346 referral_realm);
1347 else {
1348 /*
1349 * Now that we have a ticket for the desired realm, we reset
1350 * want_tgt and reinstate the desired principal so that the we can
1351 * match it and break out of the loop.
1352 */
1353 want_tgt = 0;
1354 krb5_free_principal(context, referral.server);
1355 referral.server = NULL;
1356 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
1357 }
1358 krb5_free_cred_contents(context, &tgt);
1359 tgt = ticket;
1360 memset(&ticket, 0, sizeof(ticket));
1361 if (ret)
1362 goto out;
1363 }
1364
1365 ret = krb5_copy_creds(context, &ticket, out_creds);
1366
1367 out:
1368 for (i = 0; referral_tgts && referral_tgts[i]; i++)
1369 krb5_free_creds(context, referral_tgts[i]);
1370 free(referral_tgts);
1371 krb5_free_principal(context, referral.server);
1372 krb5_free_cred_contents(context, &tgt);
1373 krb5_free_cred_contents(context, &ticket);
1374 return ret;
1375 }
1376
1377
1378 /*
1379 * Glue function between referrals version and old client chasing
1380 * codebase.
1381 */
1382
1383 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1384 _krb5_get_cred_kdc_any(krb5_context context,
1385 krb5_kdc_flags flags,
1386 krb5_ccache ccache,
1387 struct krb5_fast_state *fast_state,
1388 krb5_creds *in_creds,
1389 krb5_principal impersonate_principal,
1390 Ticket *second_ticket,
1391 krb5_creds **out_creds,
1392 krb5_creds ***ret_tgts)
1393 {
1394 char *kdc_hostname = NULL;
1395 char *sitename = NULL;
1396 krb5_error_code ret;
1397 krb5_deltat offset;
1398 krb5_data data;
1399
1400 krb5_data_zero(&data);
1401
1402 /*
1403 * If we are using LKDC, lets pull out the addreses from the
1404 * ticket and use that.
1405 */
1406
1407 ret = krb5_cc_get_config(context, ccache, NULL, "lkdc-hostname", &data);
1408 if (ret == 0) {
1409 if ((kdc_hostname = strndup(data.data, data.length)) == NULL) {
1410 ret = krb5_enomem(context);
1411 goto out;
1412 }
1413 krb5_data_free(&data);
1414 }
1415
1416 ret = krb5_cc_get_config(context, ccache, NULL, "sitename", &data);
1417 if (ret == 0) {
1418 if ((sitename = strndup(data.data, data.length)) == NULL) {
1419 ret = krb5_enomem(context);
1420 goto out;
1421 }
1422 krb5_data_free(&data);
1423 }
1424
1425 ret = krb5_cc_get_kdc_offset(context, ccache, &offset);
1426 if (ret == 0) {
1427 context->kdc_sec_offset = offset;
1428 context->kdc_usec_offset = 0;
1429 }
1430
1431 if (strcmp(in_creds->server->realm, "") != 0) {
1432 /*
1433 * Non-empty realm? Try capaths first. We might have local
1434 * policy (capaths) to honor.
1435 */
1436 ret = get_cred_kdc_capath(context,
1437 flags,
1438 ccache,
1439 fast_state,
1440 in_creds,
1441 impersonate_principal,
1442 second_ticket,
1443 kdc_hostname,
1444 sitename,
1445 out_creds,
1446 ret_tgts);
1447 if (ret == 0 || skip_referrals(in_creds->server, &flags))
1448 goto out;
1449 }
1450
1451 /* Otherwise try referrals */
1452 ret = get_cred_kdc_referral(context,
1453 flags,
1454 ccache,
1455 fast_state,
1456 in_creds,
1457 impersonate_principal,
1458 second_ticket,
1459 kdc_hostname,
1460 sitename,
1461 out_creds);
1462
1463 out:
1464 krb5_data_free(&data);
1465 free(kdc_hostname);
1466 free(sitename);
1467 return ret;
1468 }
1469
1470 static krb5_error_code
1471 check_cc(krb5_context context, krb5_flags options, krb5_ccache ccache,
1472 krb5_creds *in_creds, krb5_creds *out_creds)
1473 {
1474 krb5_error_code ret;
1475 krb5_timestamp now;
1476 krb5_creds mcreds = *in_creds;
1477
1478 krb5_timeofday(context, &now);
1479
1480 if (!(options & KRB5_GC_EXPIRED_OK) &&
1481 mcreds.times.endtime < now) {
1482 mcreds.times.renew_till = 0;
1483 krb5_timeofday(context, &mcreds.times.endtime);
1484 options |= KRB5_TC_MATCH_TIMES;
1485 }
1486
1487 if (mcreds.server->name.name_type == KRB5_NT_SRV_HST_NEEDS_CANON) {
1488 /* Avoid name canonicalization in krb5_cc_retrieve_cred() */
1489 krb5_principal_set_type(context, mcreds.server, KRB5_NT_SRV_HST);
1490 }
1491
1492 if (options & KRB5_GC_ANONYMOUS) {
1493 ret = krb5_make_principal(context,
1494 &mcreds.client,
1495 krb5_principal_get_realm(context, mcreds.client),
1496 KRB5_WELLKNOWN_NAME,
1497 KRB5_ANON_NAME,
1498 NULL);
1499 if (ret)
1500 return ret;
1501 }
1502
1503 ret = krb5_cc_retrieve_cred(context, ccache,
1504 (options &
1505 (KRB5_TC_DONT_MATCH_REALM |
1506 KRB5_TC_MATCH_KEYTYPE |
1507 KRB5_TC_MATCH_TIMES)),
1508 &mcreds, out_creds);
1509
1510 if (options & KRB5_GC_ANONYMOUS)
1511 krb5_free_principal(context, mcreds.client);
1512
1513 if (ret == 0 && out_creds->server->realm &&
1514 out_creds->server->realm[0] == '\0') {
1515 Ticket ticket;
1516
1517 /*
1518 * We only write tickets to the ccache that have been validated, as in,
1519 * the sname/srealm from the KDC-REP enc-part have been checked to
1520 * match the sname/realm from the Ticket from the KDC-REP.
1521 *
1522 * Our caller needs the canonical realm of the service in order to be
1523 * able to get forwarded credentials for it when destination-TGT
1524 * forwarding is enabled.
1525 *
1526 * As well, gss_init_sec_context() ought to arrange for
1527 * gss_inquire_context() to output the canonical acceptor name on the
1528 * initiator side.
1529 */
1530 ret = decode_Ticket(out_creds->ticket.data, out_creds->ticket.length,
1531 &ticket, NULL);
1532 if (ret == 0) {
1533 ret = krb5_principal_set_realm(context, out_creds->server,
1534 ticket.realm);
1535 free_Ticket(&ticket);
1536 } else {
1537 krb5_free_cred_contents(context, out_creds);
1538 }
1539 }
1540 return ret;
1541 }
1542
1543 static void
1544 store_cred(krb5_context context, krb5_ccache ccache,
1545 krb5_const_principal server_princ, krb5_creds *creds)
1546 {
1547 if (context->no_ticket_store)
1548 return;
1549 if (!krb5_principal_compare(context, creds->server, server_princ) &&
1550 !krb5_principal_is_krbtgt(context, server_princ)) {
1551 krb5_principal tmp_princ = creds->server;
1552 /*
1553 * Store the cred with the pre-canon server princ first so it
1554 * can be found quickly in the future.
1555 */
1556 creds->server = (krb5_principal)server_princ;
1557 krb5_cc_store_cred(context, ccache, creds);
1558 creds->server = tmp_princ;
1559 /* Then store again with the canonicalized server princ */
1560 }
1561 krb5_cc_store_cred(context, ccache, creds);
1562 }
1563
1564
1565 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1566 krb5_get_credentials_with_flags(krb5_context context,
1567 krb5_flags options,
1568 krb5_kdc_flags flags,
1569 krb5_ccache ccache,
1570 krb5_creds *in_creds,
1571 krb5_creds **out_creds)
1572 {
1573 struct krb5_fast_state fast_state;
1574 krb5_error_code ret;
1575 krb5_name_canon_iterator name_canon_iter = NULL;
1576 krb5_name_canon_rule_options rule_opts;
1577 krb5_const_principal try_princ = NULL;
1578 krb5_principal save_princ = in_creds->server;
1579 krb5_creds **tgts;
1580 krb5_creds *res_creds;
1581 int i;
1582
1583 memset(&fast_state, 0, sizeof(fast_state));
1584
1585 if (_krb5_have_debug(context, 5)) {
1586 char *unparsed;
1587
1588 ret = krb5_unparse_name(context, in_creds->server, &unparsed);
1589 if (ret) {
1590 _krb5_debug(context, 5, "krb5_get_creds: unable to display "
1591 "requested service principal");
1592 } else {
1593 _krb5_debug(context, 5, "krb5_get_creds: requesting a ticket "
1594 "for %s", unparsed);
1595 free(unparsed);
1596 }
1597 }
1598
1599 if (in_creds->session.keytype) {
1600 ret = krb5_enctype_valid(context, in_creds->session.keytype);
1601 if (ret)
1602 return ret;
1603 options |= KRB5_TC_MATCH_KEYTYPE;
1604 }
1605
1606 *out_creds = NULL;
1607 res_creds = calloc(1, sizeof(*res_creds));
1608 if (res_creds == NULL)
1609 return krb5_enomem(context);
1610
1611 ret = krb5_name_canon_iterator_start(context, in_creds->server,
1612 &name_canon_iter);
1613 if (ret)
1614 goto out;
1615
1616 next_rule:
1617 krb5_free_cred_contents(context, res_creds);
1618 memset(res_creds, 0, sizeof (*res_creds));
1619 ret = krb5_name_canon_iterate(context, &name_canon_iter, &try_princ,
1620 &rule_opts);
1621 in_creds->server = rk_UNCONST(try_princ);
1622 if (ret)
1623 goto out;
1624
1625 if (name_canon_iter == NULL) {
1626 if (options & KRB5_GC_CACHED)
1627 ret = KRB5_CC_NOTFOUND;
1628 else
1629 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1630 goto out;
1631 }
1632
1633 ret = check_cc(context, options, ccache, in_creds, res_creds);
1634 if (ret == 0) {
1635 *out_creds = res_creds;
1636 res_creds = NULL;
1637 goto out;
1638 } else if(ret != KRB5_CC_END) {
1639 goto out;
1640 }
1641 if (options & KRB5_GC_CACHED)
1642 goto next_rule;
1643
1644 if(options & KRB5_GC_USER_USER)
1645 flags.b.enc_tkt_in_skey = 1;
1646 if (flags.b.enc_tkt_in_skey)
1647 options |= KRB5_GC_NO_STORE;
1648
1649 tgts = NULL;
1650 ret = _krb5_get_cred_kdc_any(context, flags, ccache, &fast_state,
1651 in_creds, NULL, NULL, out_creds, &tgts);
1652 for (i = 0; tgts && tgts[i]; i++) {
1653 if ((options & KRB5_GC_NO_STORE) == 0)
1654 krb5_cc_store_cred(context, ccache, tgts[i]);
1655 krb5_free_creds(context, tgts[i]);
1656 }
1657 free(tgts);
1658
1659 /* We don't yet have TGS w/ FAST, so we can't protect KBR-ERRORs */
1660 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN &&
1661 !(rule_opts & KRB5_NCRO_USE_FAST))
1662 goto next_rule;
1663
1664 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1665 store_cred(context, ccache, in_creds->server, *out_creds);
1666
1667 if (ret == 0 && _krb5_have_debug(context, 5)) {
1668 char *unparsed;
1669
1670 ret = krb5_unparse_name(context, (*out_creds)->server, &unparsed);
1671 if (ret) {
1672 _krb5_debug(context, 5, "krb5_get_creds: unable to display "
1673 "service principal");
1674 } else {
1675 _krb5_debug(context, 5, "krb5_get_creds: got a ticket for %s",
1676 unparsed);
1677 free(unparsed);
1678 }
1679 }
1680
1681 out:
1682 in_creds->server = save_princ;
1683 krb5_free_creds(context, res_creds);
1684 krb5_free_name_canon_iterator(context, name_canon_iter);
1685 _krb5_fast_free(context, &fast_state);
1686 if (ret)
1687 return not_found(context, in_creds->server, ret);
1688 return 0;
1689 }
1690
1691 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1692 krb5_get_credentials(krb5_context context,
1693 krb5_flags options,
1694 krb5_ccache ccache,
1695 krb5_creds *in_creds,
1696 krb5_creds **out_creds)
1697 {
1698 krb5_kdc_flags flags;
1699 flags.i = 0;
1700 return krb5_get_credentials_with_flags(context, options, flags,
1701 ccache, in_creds, out_creds);
1702 }
1703
1704 struct krb5_get_creds_opt_data {
1705 krb5_principal self;
1706 krb5_flags options;
1707 krb5_enctype enctype;
1708 Ticket *ticket;
1709 };
1710
1711
1712 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1713 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1714 {
1715 *opt = calloc(1, sizeof(**opt));
1716 if (*opt == NULL)
1717 return krb5_enomem(context);
1718 return 0;
1719 }
1720
1721 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1722 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1723 {
1724 if (opt->self)
1725 krb5_free_principal(context, opt->self);
1726 if (opt->ticket) {
1727 free_Ticket(opt->ticket);
1728 free(opt->ticket);
1729 }
1730 memset(opt, 0, sizeof(*opt));
1731 free(opt);
1732 }
1733
1734 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1735 krb5_get_creds_opt_set_options(krb5_context context,
1736 krb5_get_creds_opt opt,
1737 krb5_flags options)
1738 {
1739 opt->options = options;
1740 }
1741
1742 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1743 krb5_get_creds_opt_add_options(krb5_context context,
1744 krb5_get_creds_opt opt,
1745 krb5_flags options)
1746 {
1747 opt->options |= options;
1748 }
1749
1750 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
1751 krb5_get_creds_opt_set_enctype(krb5_context context,
1752 krb5_get_creds_opt opt,
1753 krb5_enctype enctype)
1754 {
1755 opt->enctype = enctype;
1756 }
1757
1758 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1759 krb5_get_creds_opt_set_impersonate(krb5_context context,
1760 krb5_get_creds_opt opt,
1761 krb5_const_principal self)
1762 {
1763 if (opt->self)
1764 krb5_free_principal(context, opt->self);
1765 return krb5_copy_principal(context, self, &opt->self);
1766 }
1767
1768 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1769 krb5_get_creds_opt_set_ticket(krb5_context context,
1770 krb5_get_creds_opt opt,
1771 const Ticket *ticket)
1772 {
1773 if (opt->ticket) {
1774 free_Ticket(opt->ticket);
1775 free(opt->ticket);
1776 opt->ticket = NULL;
1777 }
1778 if (ticket) {
1779 krb5_error_code ret;
1780
1781 opt->ticket = malloc(sizeof(*ticket));
1782 if (opt->ticket == NULL)
1783 return krb5_enomem(context);
1784 ret = copy_Ticket(ticket, opt->ticket);
1785 if (ret) {
1786 free(opt->ticket);
1787 opt->ticket = NULL;
1788 krb5_set_error_message(context, ret,
1789 N_("malloc: out of memory", ""));
1790 return ret;
1791 }
1792 }
1793 return 0;
1794 }
1795
1796
1797 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1798 krb5_get_creds(krb5_context context,
1799 krb5_get_creds_opt opt,
1800 krb5_ccache ccache,
1801 krb5_const_principal inprinc,
1802 krb5_creds **out_creds)
1803 {
1804 struct krb5_fast_state fast_state;
1805 krb5_kdc_flags flags;
1806 krb5_flags options;
1807 krb5_creds in_creds;
1808 krb5_error_code ret;
1809 krb5_creds **tgts;
1810 krb5_creds *res_creds;
1811 krb5_const_principal try_princ = NULL;
1812 krb5_name_canon_iterator name_canon_iter = NULL;
1813 krb5_name_canon_rule_options rule_opts;
1814 int i;
1815 int type;
1816 const char *comp;
1817
1818 memset(&fast_state, 0, sizeof(fast_state));
1819 memset(&in_creds, 0, sizeof(in_creds));
1820 in_creds.server = rk_UNCONST(inprinc);
1821
1822 if (_krb5_have_debug(context, 5)) {
1823 char *unparsed;
1824
1825 ret = krb5_unparse_name(context, in_creds.server, &unparsed);
1826 if (ret) {
1827 _krb5_debug(context, 5, "krb5_get_creds: unable to display "
1828 "requested service principal");
1829 } else {
1830 _krb5_debug(context, 5, "krb5_get_creds: requesting a ticket "
1831 "for %s", unparsed);
1832 free(unparsed);
1833 }
1834 }
1835
1836 if (opt && opt->enctype) {
1837 ret = krb5_enctype_valid(context, opt->enctype);
1838 if (ret)
1839 return ret;
1840 }
1841
1842 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1843 if (ret)
1844 return ret;
1845
1846 if (opt)
1847 options = opt->options;
1848 else
1849 options = 0;
1850 flags.i = 0;
1851
1852 *out_creds = NULL;
1853 res_creds = calloc(1, sizeof(*res_creds));
1854 if (res_creds == NULL) {
1855 krb5_free_principal(context, in_creds.client);
1856 return krb5_enomem(context);
1857 }
1858
1859 if (opt && opt->enctype) {
1860 in_creds.session.keytype = opt->enctype;
1861 options |= KRB5_TC_MATCH_KEYTYPE;
1862 }
1863
1864 ret = krb5_name_canon_iterator_start(context, in_creds.server,
1865 &name_canon_iter);
1866 if (ret)
1867 goto out;
1868
1869 next_rule:
1870 ret = krb5_name_canon_iterate(context, &name_canon_iter, &try_princ,
1871 &rule_opts);
1872 in_creds.server = rk_UNCONST(try_princ);
1873 if (ret)
1874 goto out;
1875
1876 if (name_canon_iter == NULL) {
1877 if (options & KRB5_GC_CACHED)
1878 ret = KRB5_CC_NOTFOUND;
1879 else
1880 ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
1881 goto out;
1882 }
1883
1884 if ((options & KRB5_GC_CONSTRAINED_DELEGATION) == 0) {
1885 ret = check_cc(context, options, ccache, &in_creds, res_creds);
1886 if (ret == 0) {
1887 *out_creds = res_creds;
1888 res_creds = NULL;
1889 goto out;
1890 } else if (ret != KRB5_CC_END) {
1891 goto out;
1892 }
1893 }
1894 if (options & KRB5_GC_CACHED)
1895 goto next_rule;
1896
1897 type = krb5_principal_get_type(context, try_princ);
1898 comp = krb5_principal_get_comp_string(context, try_princ, 0);
1899 if ((type == KRB5_NT_SRV_HST || type == KRB5_NT_UNKNOWN) &&
1900 comp != NULL && strcmp(comp, "host") == 0)
1901 flags.b.canonicalize = 1;
1902 if (rule_opts & KRB5_NCRO_NO_REFERRALS)
1903 flags.b.canonicalize = 0;
1904 else
1905 flags.b.canonicalize = (options & KRB5_GC_CANONICALIZE) ? 1 : 0;
1906 if (options & KRB5_GC_USER_USER) {
1907 flags.b.enc_tkt_in_skey = 1;
1908 options |= KRB5_GC_NO_STORE;
1909 }
1910 if (options & KRB5_GC_FORWARDABLE)
1911 flags.b.forwardable = 1;
1912 if (options & KRB5_GC_NO_TRANSIT_CHECK)
1913 flags.b.disable_transited_check = 1;
1914 if (options & KRB5_GC_CONSTRAINED_DELEGATION)
1915 flags.b.cname_in_addl_tkt = 1;
1916 if (options & KRB5_GC_ANONYMOUS)
1917 flags.b.request_anonymous = 1;
1918
1919 tgts = NULL;
1920 ret = _krb5_get_cred_kdc_any(context, flags, ccache, &fast_state,
1921 &in_creds, opt ? opt->self : 0,
1922 opt ? opt->ticket : 0, out_creds,
1923 &tgts);
1924 for (i = 0; tgts && tgts[i]; i++) {
1925 if ((options & KRB5_GC_NO_STORE) == 0)
1926 krb5_cc_store_cred(context, ccache, tgts[i]);
1927 krb5_free_creds(context, tgts[i]);
1928 }
1929 free(tgts);
1930
1931 /* We don't yet have TGS w/ FAST, so we can't protect KBR-ERRORs */
1932 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN &&
1933 !(rule_opts & KRB5_NCRO_USE_FAST))
1934 goto next_rule;
1935
1936 if (ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1937 store_cred(context, ccache, inprinc, *out_creds);
1938
1939 if (ret == 0 && _krb5_have_debug(context, 5)) {
1940 char *unparsed;
1941
1942 ret = krb5_unparse_name(context, (*out_creds)->server, &unparsed);
1943 if (ret) {
1944 _krb5_debug(context, 5, "krb5_get_creds: unable to display "
1945 "service principal");
1946 } else {
1947 _krb5_debug(context, 5, "krb5_get_creds: got a ticket for %s",
1948 unparsed);
1949 free(unparsed);
1950 }
1951 }
1952
1953 out:
1954 _krb5_fast_free(context, &fast_state);
1955 krb5_free_creds(context, res_creds);
1956 krb5_free_principal(context, in_creds.client);
1957 krb5_free_name_canon_iterator(context, name_canon_iter);
1958 if (ret)
1959 return not_found(context, inprinc, ret);
1960 return ret;
1961 }
1962
1963 /*
1964 *
1965 */
1966
1967 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
1968 krb5_get_renewed_creds(krb5_context context,
1969 krb5_creds *creds,
1970 krb5_const_principal client,
1971 krb5_ccache ccache,
1972 const char *in_tkt_service)
1973 {
1974 krb5_error_code ret;
1975 krb5_kdc_flags flags;
1976 krb5_creds in, *template, *out = NULL;
1977
1978 memset(&in, 0, sizeof(in));
1979 memset(creds, 0, sizeof(*creds));
1980
1981 ret = krb5_copy_principal(context, client, &in.client);
1982 if (ret)
1983 return ret;
1984
1985 if (in_tkt_service) {
1986 ret = krb5_parse_name(context, in_tkt_service, &in.server);
1987 if (ret) {
1988 krb5_free_principal(context, in.client);
1989 return ret;
1990 }
1991 } else {
1992 const char *realm = krb5_principal_get_realm(context, client);
1993
1994 ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1995 realm, NULL);
1996 if (ret) {
1997 krb5_free_principal(context, in.client);
1998 return ret;
1999 }
2000 }
2001
2002 flags.i = 0;
2003 flags.b.renewable = flags.b.renew = 1;
2004
2005 /*
2006 * Get template from old credential cache for the same entry, if
2007 * this failes, no worries.
2008 */
2009 ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
2010 if (ret == 0) {
2011 flags.b.forwardable = template->flags.b.forwardable;
2012 flags.b.proxiable = template->flags.b.proxiable;
2013 krb5_free_creds (context, template);
2014 }
2015
2016 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
2017 krb5_free_principal(context, in.client);
2018 krb5_free_principal(context, in.server);
2019 if (ret)
2020 return ret;
2021
2022 ret = krb5_copy_creds_contents(context, out, creds);
2023 krb5_free_creds(context, out);
2024
2025 return ret;
2026 }
Heimdal