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Add missing ',' between parameters [HEIMDAL-599]
[heimdal.git] / lib / krb5 / get_cred.c
blob10417f1a529f1bcb309a3cf4b995cc2787b46ca7
1 /*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 #include <krb5_locl.h>
35
36 /*
37 * Take the `body' and encode it into `padata' using the credentials
38 * in `creds'.
39 */
40
41 static krb5_error_code
42 make_pa_tgs_req(krb5_context context,
43 krb5_auth_context ac,
44 KDC_REQ_BODY *body,
45 PA_DATA *padata,
46 krb5_creds *creds)
47 {
48 u_char *buf;
49 size_t buf_size;
50 size_t len;
51 krb5_data in_data;
52 krb5_error_code ret;
53
54 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
55 if (ret)
56 goto out;
57 if(buf_size != len)
58 krb5_abortx(context, "internal error in ASN.1 encoder");
59
60 in_data.length = len;
61 in_data.data = buf;
62 ret = _krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
63 &padata->padata_value,
64 KRB5_KU_TGS_REQ_AUTH_CKSUM,
65 KRB5_KU_TGS_REQ_AUTH);
66 out:
67 free (buf);
68 if(ret)
69 return ret;
70 padata->padata_type = KRB5_PADATA_TGS_REQ;
71 return 0;
72 }
73
74 /*
75 * Set the `enc-authorization-data' in `req_body' based on `authdata'
76 */
77
78 static krb5_error_code
79 set_auth_data (krb5_context context,
80 KDC_REQ_BODY *req_body,
81 krb5_authdata *authdata,
82 krb5_keyblock *key)
83 {
84 if(authdata->len) {
85 size_t len, buf_size;
86 unsigned char *buf;
87 krb5_crypto crypto;
88 krb5_error_code ret;
89
90 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata,
91 &len, ret);
92 if (ret)
93 return ret;
94 if (buf_size != len)
95 krb5_abortx(context, "internal error in ASN.1 encoder");
96
97 ALLOC(req_body->enc_authorization_data, 1);
98 if (req_body->enc_authorization_data == NULL) {
99 free (buf);
100 krb5_set_error_message(context, ENOMEM,
101 N_("malloc: out of memory", ""));
102 return ENOMEM;
103 }
104 ret = krb5_crypto_init(context, key, 0, &crypto);
105 if (ret) {
106 free (buf);
107 free (req_body->enc_authorization_data);
108 req_body->enc_authorization_data = NULL;
109 return ret;
110 }
111 krb5_encrypt_EncryptedData(context,
112 crypto,
113 KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
114 /* KRB5_KU_TGS_REQ_AUTH_DAT_SESSION? */
115 buf,
116 len,
117 0,
118 req_body->enc_authorization_data);
119 free (buf);
120 krb5_crypto_destroy(context, crypto);
121 } else {
122 req_body->enc_authorization_data = NULL;
123 }
124 return 0;
125 }
126
127 /*
128 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
129 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
130 * subkey in `subkey'.
131 */
132
133 static krb5_error_code
134 init_tgs_req (krb5_context context,
135 krb5_ccache ccache,
136 krb5_addresses *addresses,
137 krb5_kdc_flags flags,
138 Ticket *second_ticket,
139 krb5_creds *in_creds,
140 krb5_creds *krbtgt,
141 unsigned nonce,
142 const METHOD_DATA *padata,
143 krb5_keyblock **subkey,
144 TGS_REQ *t)
145 {
146 krb5_error_code ret = 0;
147
148 memset(t, 0, sizeof(*t));
149 t->pvno = 5;
150 t->msg_type = krb_tgs_req;
151 if (in_creds->session.keytype) {
152 ALLOC_SEQ(&t->req_body.etype, 1);
153 if(t->req_body.etype.val == NULL) {
154 ret = ENOMEM;
155 krb5_set_error_message(context, ret,
156 N_("malloc: out of memory", ""));
157 goto fail;
158 }
159 t->req_body.etype.val[0] = in_creds->session.keytype;
160 } else {
161 ret = krb5_init_etype(context,
162 &t->req_body.etype.len,
163 &t->req_body.etype.val,
164 NULL);
165 }
166 if (ret)
167 goto fail;
168 t->req_body.addresses = addresses;
169 t->req_body.kdc_options = flags.b;
170 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
171 if (ret)
172 goto fail;
173 ALLOC(t->req_body.sname, 1);
174 if (t->req_body.sname == NULL) {
175 ret = ENOMEM;
176 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
177 goto fail;
178 }
179
180 /* some versions of some code might require that the client be
181 present in TGS-REQs, but this is clearly against the spec */
182
183 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
184 if (ret)
185 goto fail;
186
187 /* req_body.till should be NULL if there is no endtime specified,
188 but old MIT code (like DCE secd) doesn't like that */
189 ALLOC(t->req_body.till, 1);
190 if(t->req_body.till == NULL){
191 ret = ENOMEM;
192 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
193 goto fail;
194 }
195 *t->req_body.till = in_creds->times.endtime;
196
197 t->req_body.nonce = nonce;
198 if(second_ticket){
199 ALLOC(t->req_body.additional_tickets, 1);
200 if (t->req_body.additional_tickets == NULL) {
201 ret = ENOMEM;
202 krb5_set_error_message(context, ret,
203 N_("malloc: out of memory", ""));
204 goto fail;
205 }
206 ALLOC_SEQ(t->req_body.additional_tickets, 1);
207 if (t->req_body.additional_tickets->val == NULL) {
208 ret = ENOMEM;
209 krb5_set_error_message(context, ret,
210 N_("malloc: out of memory", ""));
211 goto fail;
212 }
213 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
214 if (ret)
215 goto fail;
216 }
217 ALLOC(t->padata, 1);
218 if (t->padata == NULL) {
219 ret = ENOMEM;
220 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
221 goto fail;
222 }
223 ALLOC_SEQ(t->padata, 1 + padata->len);
224 if (t->padata->val == NULL) {
225 ret = ENOMEM;
226 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
227 goto fail;
228 }
229 {
230 int i;
231 for (i = 0; i < padata->len; i++) {
232 ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
233 if (ret) {
234 krb5_set_error_message(context, ret,
235 N_("malloc: out of memory", ""));
236 goto fail;
237 }
238 }
239 }
240
241 {
242 krb5_auth_context ac;
243 krb5_keyblock *key = NULL;
244
245 ret = krb5_auth_con_init(context, &ac);
246 if(ret)
247 goto fail;
248
249 if (krb5_config_get_bool_default(context, NULL, FALSE,
250 "realms",
251 krbtgt->server->realm,
252 "tgs_require_subkey",
253 NULL))
254 {
255 ret = krb5_generate_subkey (context, &krbtgt->session, &key);
256 if (ret) {
257 krb5_auth_con_free (context, ac);
258 goto fail;
259 }
260
261 ret = krb5_auth_con_setlocalsubkey(context, ac, key);
262 if (ret) {
263 if (key)
264 krb5_free_keyblock (context, key);
265 krb5_auth_con_free (context, ac);
266 goto fail;
267 }
268 }
269
270 ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
271 key ? key : &krbtgt->session);
272 if (ret) {
273 if (key)
274 krb5_free_keyblock (context, key);
275 krb5_auth_con_free (context, ac);
276 goto fail;
277 }
278
279 ret = make_pa_tgs_req(context,
280 ac,
281 &t->req_body,
282 &t->padata->val[0],
283 krbtgt);
284 if(ret) {
285 if (key)
286 krb5_free_keyblock (context, key);
287 krb5_auth_con_free(context, ac);
288 goto fail;
289 }
290 *subkey = key;
291
292 krb5_auth_con_free(context, ac);
293 }
294 fail:
295 if (ret) {
296 t->req_body.addresses = NULL;
297 free_TGS_REQ (t);
298 }
299 return ret;
300 }
301
302 krb5_error_code
303 _krb5_get_krbtgt(krb5_context context,
304 krb5_ccache id,
305 krb5_realm realm,
306 krb5_creds **cred)
307 {
308 krb5_error_code ret;
309 krb5_creds tmp_cred;
310
311 memset(&tmp_cred, 0, sizeof(tmp_cred));
312
313 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
314 if (ret)
315 return ret;
316
317 ret = krb5_make_principal(context,
318 &tmp_cred.server,
319 realm,
320 KRB5_TGS_NAME,
321 realm,
322 NULL);
323 if(ret) {
324 krb5_free_principal(context, tmp_cred.client);
325 return ret;
326 }
327 ret = krb5_get_credentials(context,
328 KRB5_GC_CACHED,
329 id,
330 &tmp_cred,
331 cred);
332 krb5_free_principal(context, tmp_cred.client);
333 krb5_free_principal(context, tmp_cred.server);
334 if(ret)
335 return ret;
336 return 0;
337 }
338
339 /* DCE compatible decrypt proc */
340 static krb5_error_code
341 decrypt_tkt_with_subkey (krb5_context context,
342 krb5_keyblock *key,
343 krb5_key_usage usage,
344 krb5_const_pointer subkey,
345 krb5_kdc_rep *dec_rep)
346 {
347 krb5_error_code ret;
348 krb5_data data;
349 size_t size;
350 krb5_crypto crypto;
351
352 ret = krb5_crypto_init(context, key, 0, &crypto);
353 if (ret)
354 return ret;
355 ret = krb5_decrypt_EncryptedData (context,
356 crypto,
357 usage,
358 &dec_rep->kdc_rep.enc_part,
359 &data);
360 krb5_crypto_destroy(context, crypto);
361 if(ret && subkey){
362 /* DCE compat -- try to decrypt with subkey */
363 ret = krb5_crypto_init(context, subkey, 0, &crypto);
364 if (ret)
365 return ret;
366 ret = krb5_decrypt_EncryptedData (context,
367 crypto,
368 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
369 &dec_rep->kdc_rep.enc_part,
370 &data);
371 krb5_crypto_destroy(context, crypto);
372 }
373 if (ret)
374 return ret;
375
376 ret = decode_EncASRepPart(data.data,
377 data.length,
378 &dec_rep->enc_part,
379 &size);
380 if (ret)
381 ret = decode_EncTGSRepPart(data.data,
382 data.length,
383 &dec_rep->enc_part,
384 &size);
385 if (ret)
386 krb5_set_error_message(context, ret,
387 N_("Failed to decode encpart in ticket", ""));
388 krb5_data_free (&data);
389 return ret;
390 }
391
392 static krb5_error_code
393 get_cred_kdc(krb5_context context,
394 krb5_ccache id,
395 krb5_kdc_flags flags,
396 krb5_addresses *addresses,
397 krb5_creds *in_creds,
398 krb5_creds *krbtgt,
399 krb5_principal impersonate_principal,
400 Ticket *second_ticket,
401 krb5_creds *out_creds)
402 {
403 TGS_REQ req;
404 krb5_data enc;
405 krb5_data resp;
406 krb5_kdc_rep rep;
407 KRB_ERROR error;
408 krb5_error_code ret;
409 unsigned nonce;
410 krb5_keyblock *subkey = NULL;
411 size_t len;
412 Ticket second_ticket_data;
413 METHOD_DATA padata;
414
415 krb5_data_zero(&resp);
416 krb5_data_zero(&enc);
417 padata.val = NULL;
418 padata.len = 0;
419
420 krb5_generate_random_block(&nonce, sizeof(nonce));
421 nonce &= 0xffffffff;
422
423 if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
424 ret = decode_Ticket(in_creds->second_ticket.data,
425 in_creds->second_ticket.length,
426 &second_ticket_data, &len);
427 if(ret)
428 return ret;
429 second_ticket = &second_ticket_data;
430 }
431
432
433 if (impersonate_principal) {
434 krb5_crypto crypto;
435 PA_S4U2Self self;
436 krb5_data data;
437 void *buf;
438 size_t size;
439
440 self.name = impersonate_principal->name;
441 self.realm = impersonate_principal->realm;
442 self.auth = estrdup("Kerberos");
443
444 ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
445 if (ret) {
446 free(self.auth);
447 goto out;
448 }
449
450 ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
451 if (ret) {
452 free(self.auth);
453 krb5_data_free(&data);
454 goto out;
455 }
456
457 ret = krb5_create_checksum(context,
458 crypto,
459 KRB5_KU_OTHER_CKSUM,
460 0,
461 data.data,
462 data.length,
463 &self.cksum);
464 krb5_crypto_destroy(context, crypto);
465 krb5_data_free(&data);
466 if (ret) {
467 free(self.auth);
468 goto out;
469 }
470
471 ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
472 free(self.auth);
473 free_Checksum(&self.cksum);
474 if (ret)
475 goto out;
476 if (len != size)
477 krb5_abortx(context, "internal asn1 error");
478
479 ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
480 if (ret)
481 goto out;
482 }
483
484 ret = init_tgs_req (context,
485 id,
486 addresses,
487 flags,
488 second_ticket,
489 in_creds,
490 krbtgt,
491 nonce,
492 &padata,
493 &subkey,
494 &req);
495 if (ret)
496 goto out;
497
498 ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
499 if (ret)
500 goto out;
501 if(enc.length != len)
502 krb5_abortx(context, "internal error in ASN.1 encoder");
503
504 /* don't free addresses */
505 req.req_body.addresses = NULL;
506 free_TGS_REQ(&req);
507
508 /*
509 * Send and receive
510 */
511 {
512 krb5_sendto_ctx stctx;
513 ret = krb5_sendto_ctx_alloc(context, &stctx);
514 if (ret)
515 return ret;
516 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
517
518 ret = krb5_sendto_context (context, stctx, &enc,
519 krbtgt->server->name.name_string.val[1],
520 &resp);
521 krb5_sendto_ctx_free(context, stctx);
522 }
523 if(ret)
524 goto out;
525
526 memset(&rep, 0, sizeof(rep));
527 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
528 unsigned eflags = 0;
529
530 ret = krb5_copy_principal(context,
531 in_creds->client,
532 &out_creds->client);
533 if(ret)
534 goto out2;
535 ret = krb5_copy_principal(context,
536 in_creds->server,
537 &out_creds->server);
538 if(ret)
539 goto out2;
540 /* this should go someplace else */
541 out_creds->times.endtime = in_creds->times.endtime;
542
543 /* XXX should do better testing */
544 if (flags.b.constrained_delegation || impersonate_principal)
545 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
546
547 ret = _krb5_extract_ticket(context,
548 &rep,
549 out_creds,
550 &krbtgt->session,
551 NULL,
552 KRB5_KU_TGS_REP_ENC_PART_SESSION,
553 &krbtgt->addresses,
554 nonce,
555 eflags,
556 decrypt_tkt_with_subkey,
557 subkey);
558 out2:
559 krb5_free_kdc_rep(context, &rep);
560 } else if(krb5_rd_error(context, &resp, &error) == 0) {
561 ret = krb5_error_from_rd_error(context, &error, in_creds);
562 krb5_free_error_contents(context, &error);
563 } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
564 ret = KRB5KRB_AP_ERR_V4_REPLY;
565 krb5_clear_error_message(context);
566 } else {
567 ret = KRB5KRB_AP_ERR_MSG_TYPE;
568 krb5_clear_error_message(context);
569 }
570
571 out:
572 if (second_ticket == &second_ticket_data)
573 free_Ticket(&second_ticket_data);
574 free_METHOD_DATA(&padata);
575 krb5_data_free(&resp);
576 krb5_data_free(&enc);
577 if(subkey){
578 krb5_free_keyblock_contents(context, subkey);
579 free(subkey);
580 }
581 return ret;
582
583 }
584
585 /*
586 * same as above, just get local addresses first if the krbtgt have
587 * them and the realm is not addressless
588 */
589
590 static krb5_error_code
591 get_cred_kdc_address(krb5_context context,
592 krb5_ccache id,
593 krb5_kdc_flags flags,
594 krb5_addresses *addrs,
595 krb5_creds *in_creds,
596 krb5_creds *krbtgt,
597 krb5_principal impersonate_principal,
598 Ticket *second_ticket,
599 krb5_creds *out_creds)
600 {
601 krb5_error_code ret;
602 krb5_addresses addresses = { 0, NULL };
603
604 /*
605 * Inherit the address-ness of the krbtgt if the address is not
606 * specified.
607 */
608
609 if (addrs == NULL && krbtgt->addresses.len != 0) {
610 krb5_boolean noaddr;
611
612 krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
613 "no-addresses", FALSE, &noaddr);
614
615 if (!noaddr) {
616 krb5_get_all_client_addrs(context, &addresses);
617 /* XXX this sucks. */
618 addrs = &addresses;
619 if(addresses.len == 0)
620 addrs = NULL;
621 }
622 }
623 ret = get_cred_kdc(context, id, flags, addrs, in_creds,
624 krbtgt, impersonate_principal,
625 second_ticket, out_creds);
626 krb5_free_addresses(context, &addresses);
627 return ret;
628 }
629
630 krb5_error_code KRB5_LIB_FUNCTION
631 krb5_get_kdc_cred(krb5_context context,
632 krb5_ccache id,
633 krb5_kdc_flags flags,
634 krb5_addresses *addresses,
635 Ticket *second_ticket,
636 krb5_creds *in_creds,
637 krb5_creds **out_creds
638 )
639 {
640 krb5_error_code ret;
641 krb5_creds *krbtgt;
642
643 *out_creds = calloc(1, sizeof(**out_creds));
644 if(*out_creds == NULL) {
645 krb5_set_error_message(context, ENOMEM,
646 N_("malloc: out of memory", ""));
647 return ENOMEM;
648 }
649 ret = _krb5_get_krbtgt (context,
650 id,
651 in_creds->server->realm,
652 &krbtgt);
653 if(ret) {
654 free(*out_creds);
655 *out_creds = NULL;
656 return ret;
657 }
658 ret = get_cred_kdc(context, id, flags, addresses,
659 in_creds, krbtgt, NULL, NULL, *out_creds);
660 krb5_free_creds (context, krbtgt);
661 if(ret) {
662 free(*out_creds);
663 *out_creds = NULL;
664 }
665 return ret;
666 }
667
668 static int
669 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
670 {
671 krb5_error_code ret;
672 char *str;
673
674 ret = krb5_unparse_name(context, p, &str);
675 if(ret) {
676 krb5_clear_error_message(context);
677 return code;
678 }
679 krb5_set_error_message(context, code,
680 N_("Matching credential (%s) not found", ""), str);
681 free(str);
682 return code;
683 }
684
685 static krb5_error_code
686 find_cred(krb5_context context,
687 krb5_ccache id,
688 krb5_principal server,
689 krb5_creds **tgts,
690 krb5_creds *out_creds)
691 {
692 krb5_error_code ret;
693 krb5_creds mcreds;
694
695 krb5_cc_clear_mcred(&mcreds);
696 mcreds.server = server;
697 ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
698 &mcreds, out_creds);
699 if(ret == 0)
700 return 0;
701 while(tgts && *tgts){
702 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
703 &mcreds, *tgts)){
704 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
705 return ret;
706 }
707 tgts++;
708 }
709 return not_found(context, server, KRB5_CC_NOTFOUND);
710 }
711
712 static krb5_error_code
713 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
714 {
715 int i;
716 krb5_error_code ret;
717 krb5_creds **tmp = *tgts;
718
719 for(i = 0; tmp && tmp[i]; i++); /* XXX */
720 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
721 if(tmp == NULL) {
722 krb5_set_error_message(context, ENOMEM,
723 N_("malloc: out of memory", ""));
724 return ENOMEM;
725 }
726 *tgts = tmp;
727 ret = krb5_copy_creds(context, tkt, &tmp[i]);
728 tmp[i+1] = NULL;
729 return ret;
730 }
731
732 /*
733 get_cred(server)
734 creds = cc_get_cred(server)
735 if(creds) return creds
736 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
737 if(tgt)
738 return get_cred_tgt(server, tgt)
739 if(client_realm == server_realm)
740 return NULL
741 tgt = get_cred(krbtgt/server_realm@client_realm)
742 while(tgt_inst != server_realm)
743 tgt = get_cred(krbtgt/server_realm@tgt_inst)
744 return get_cred_tgt(server, tgt)
745 */
746
747 static krb5_error_code
748 get_cred_kdc_capath(krb5_context context,
749 krb5_kdc_flags flags,
750 krb5_ccache ccache,
751 krb5_creds *in_creds,
752 krb5_principal impersonate_principal,
753 Ticket *second_ticket,
754 krb5_creds **out_creds,
755 krb5_creds ***ret_tgts)
756 {
757 krb5_error_code ret;
758 krb5_creds *tgt, tmp_creds;
759 krb5_const_realm client_realm, server_realm, try_realm;
760 int ok_as_delegate = 1;
761
762 *out_creds = NULL;
763
764 client_realm = krb5_principal_get_realm(context, in_creds->client);
765 server_realm = krb5_principal_get_realm(context, in_creds->server);
766 memset(&tmp_creds, 0, sizeof(tmp_creds));
767 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
768 if(ret)
769 return ret;
770
771 try_realm = krb5_config_get_string(context, NULL, "capaths",
772 client_realm, server_realm, NULL);
773 if (try_realm == NULL)
774 try_realm = client_realm;
775
776 ret = krb5_make_principal(context,
777 &tmp_creds.server,
778 try_realm,
779 KRB5_TGS_NAME,
780 server_realm,
781 NULL);
782 if(ret){
783 krb5_free_principal(context, tmp_creds.client);
784 return ret;
785 }
786 {
787 krb5_creds tgts;
788
789 ret = find_cred(context, ccache, tmp_creds.server,
790 *ret_tgts, &tgts);
791 if(ret == 0){
792 if (try_realm != client_realm)
793 ok_as_delegate = tgts.flags.b.ok_as_delegate;
794
795 *out_creds = calloc(1, sizeof(**out_creds));
796 if(*out_creds == NULL) {
797 ret = ENOMEM;
798 krb5_set_error_message(context, ret,
799 N_("malloc: out of memory", ""));
800 } else {
801 ret = get_cred_kdc_address(context, ccache, flags, NULL,
802 in_creds, &tgts,
803 impersonate_principal,
804 second_ticket,
805 *out_creds);
806 if (ret) {
807 free (*out_creds);
808 *out_creds = NULL;
809 } else if (ok_as_delegate == 0)
810 (*out_creds)->flags.b.ok_as_delegate = 0;
811 }
812 krb5_free_cred_contents(context, &tgts);
813 krb5_free_principal(context, tmp_creds.server);
814 krb5_free_principal(context, tmp_creds.client);
815 return ret;
816 }
817 }
818 if(krb5_realm_compare(context, in_creds->client, in_creds->server))
819 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
820
821 /* XXX this can loop forever */
822 while(1){
823 heim_general_string tgt_inst;
824
825 ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds,
826 NULL, NULL, &tgt, ret_tgts);
827 if(ret) {
828 krb5_free_principal(context, tmp_creds.server);
829 krb5_free_principal(context, tmp_creds.client);
830 return ret;
831 }
832 /*
833 * if either of the chain or the ok_as_delegate was stripped
834 * by the kdc, make sure we strip it too.
835 */
836 if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
837 ok_as_delegate = 0;
838 tgt->flags.b.ok_as_delegate = 0;
839 }
840
841 ret = add_cred(context, tgt, ret_tgts);
842 if(ret) {
843 krb5_free_principal(context, tmp_creds.server);
844 krb5_free_principal(context, tmp_creds.client);
845 return ret;
846 }
847 tgt_inst = tgt->server->name.name_string.val[1];
848 if(strcmp(tgt_inst, server_realm) == 0)
849 break;
850 krb5_free_principal(context, tmp_creds.server);
851 ret = krb5_make_principal(context, &tmp_creds.server,
852 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
853 if(ret) {
854 krb5_free_principal(context, tmp_creds.server);
855 krb5_free_principal(context, tmp_creds.client);
856 return ret;
857 }
858 ret = krb5_free_creds(context, tgt);
859 if(ret) {
860 krb5_free_principal(context, tmp_creds.server);
861 krb5_free_principal(context, tmp_creds.client);
862 return ret;
863 }
864 }
865
866 krb5_free_principal(context, tmp_creds.server);
867 krb5_free_principal(context, tmp_creds.client);
868 *out_creds = calloc(1, sizeof(**out_creds));
869 if(*out_creds == NULL) {
870 ret = ENOMEM;
871 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
872 } else {
873 ret = get_cred_kdc_address (context, ccache, flags, NULL,
874 in_creds, tgt, impersonate_principal,
875 second_ticket, *out_creds);
876 if (ret) {
877 free (*out_creds);
878 *out_creds = NULL;
879 }
880 }
881 krb5_free_creds(context, tgt);
882 return ret;
883 }
884
885 static krb5_error_code
886 get_cred_kdc_referral(krb5_context context,
887 krb5_kdc_flags flags,
888 krb5_ccache ccache,
889 krb5_creds *in_creds,
890 krb5_principal impersonate_principal,
891 Ticket *second_ticket,
892 krb5_creds **out_creds,
893 krb5_creds ***ret_tgts)
894 {
895 krb5_const_realm client_realm;
896 krb5_error_code ret;
897 krb5_creds tgt, referral, ticket;
898 int loop = 0;
899 int ok_as_delegate = 1;
900
901 memset(&tgt, 0, sizeof(tgt));
902 memset(&ticket, 0, sizeof(ticket));
903
904 flags.b.canonicalize = 1;
905
906 *out_creds = NULL;
907
908 client_realm = krb5_principal_get_realm(context, in_creds->client);
909
910 /* find tgt for the clients base realm */
911 {
912 krb5_principal tgtname;
913
914 ret = krb5_make_principal(context, &tgtname,
915 client_realm,
916 KRB5_TGS_NAME,
917 client_realm,
918 NULL);
919 if(ret)
920 return ret;
921
922 ret = find_cred(context, ccache, tgtname, *ret_tgts, &tgt);
923 krb5_free_principal(context, tgtname);
924 if (ret)
925 return ret;
926 }
927
928 referral = *in_creds;
929 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
930 if (ret) {
931 krb5_free_cred_contents(context, &tgt);
932 return ret;
933 }
934 ret = krb5_principal_set_realm(context, referral.server, client_realm);
935 if (ret) {
936 krb5_free_cred_contents(context, &tgt);
937 krb5_free_principal(context, referral.server);
938 return ret;
939 }
940
941 while (loop++ < 17) {
942 krb5_creds **tickets;
943 krb5_creds mcreds;
944 char *referral_realm;
945
946 /* Use cache if we are not doing impersonation or contrainte deleg */
947 if (impersonate_principal == NULL || flags.b.constrained_delegation) {
948 krb5_cc_clear_mcred(&mcreds);
949 mcreds.server = referral.server;
950 ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcreds, &ticket);
951 } else
952 ret = EINVAL;
953
954 if (ret) {
955 ret = get_cred_kdc_address (context, ccache, flags, NULL,
956 &referral, &tgt, impersonate_principal,
957 second_ticket, &ticket);
958 if (ret)
959 goto out;
960 }
961
962 /* Did we get the right ticket ? */
963 if (krb5_principal_compare_any_realm(context,
964 referral.server,
965 ticket.server))
966 break;
967
968 if (ticket.server->name.name_string.len != 2 &&
969 strcmp(ticket.server->name.name_string.val[0], KRB5_TGS_NAME) != 0)
970 {
971 krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
972 N_("Got back an non krbtgt "
973 "ticket referrals", ""));
974 krb5_free_cred_contents(context, &ticket);
975 return KRB5KRB_AP_ERR_NOT_US;
976 }
977
978 referral_realm = ticket.server->name.name_string.val[1];
979
980 /* check that there are no referrals loops */
981 tickets = *ret_tgts;
982
983 krb5_cc_clear_mcred(&mcreds);
984 mcreds.server = ticket.server;
985
986 while(tickets && *tickets){
987 if(krb5_compare_creds(context,
988 KRB5_TC_DONT_MATCH_REALM,
989 &mcreds,
990 *tickets))
991 {
992 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
993 N_("Referral from %s "
994 "loops back to realm %s", ""),
995 tgt.server->realm,
996 referral_realm);
997 krb5_free_cred_contents(context, &ticket);
998 return KRB5_GET_IN_TKT_LOOP;
999 }
1000 tickets++;
1001 }
1002
1003 /*
1004 * if either of the chain or the ok_as_delegate was stripped
1005 * by the kdc, make sure we strip it too.
1006 */
1007
1008 if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
1009 ok_as_delegate = 0;
1010 ticket.flags.b.ok_as_delegate = 0;
1011 }
1012
1013 ret = add_cred(context, &ticket, ret_tgts);
1014 if (ret) {
1015 krb5_free_cred_contents(context, &ticket);
1016 goto out;
1017 }
1018
1019 /* try realm in the referral */
1020 ret = krb5_principal_set_realm(context,
1021 referral.server,
1022 referral_realm);
1023 krb5_free_cred_contents(context, &tgt);
1024 tgt = ticket;
1025 memset(&ticket, 0, sizeof(ticket));
1026 if (ret)
1027 goto out;
1028 }
1029
1030 ret = krb5_copy_creds(context, &ticket, out_creds);
1031
1032 out:
1033 krb5_free_principal(context, referral.server);
1034 krb5_free_cred_contents(context, &tgt);
1035 return ret;
1036 }
1037
1038
1039 /*
1040 * Glue function between referrals version and old client chasing
1041 * codebase.
1042 */
1043
1044 krb5_error_code
1045 _krb5_get_cred_kdc_any(krb5_context context,
1046 krb5_kdc_flags flags,
1047 krb5_ccache ccache,
1048 krb5_creds *in_creds,
1049 krb5_principal impersonate_principal,
1050 Ticket *second_ticket,
1051 krb5_creds **out_creds,
1052 krb5_creds ***ret_tgts)
1053 {
1054 krb5_error_code ret;
1055
1056 ret = get_cred_kdc_referral(context,
1057 flags,
1058 ccache,
1059 in_creds,
1060 impersonate_principal,
1061 second_ticket,
1062 out_creds,
1063 ret_tgts);
1064 if (ret == 0 || flags.b.canonicalize)
1065 return ret;
1066 return get_cred_kdc_capath(context,
1067 flags,
1068 ccache,
1069 in_creds,
1070 impersonate_principal,
1071 second_ticket,
1072 out_creds,
1073 ret_tgts);
1074 }
1075
1076
1077 krb5_error_code KRB5_LIB_FUNCTION
1078 krb5_get_credentials_with_flags(krb5_context context,
1079 krb5_flags options,
1080 krb5_kdc_flags flags,
1081 krb5_ccache ccache,
1082 krb5_creds *in_creds,
1083 krb5_creds **out_creds)
1084 {
1085 krb5_error_code ret;
1086 krb5_creds **tgts;
1087 krb5_creds *res_creds;
1088 int i;
1089
1090 *out_creds = NULL;
1091 res_creds = calloc(1, sizeof(*res_creds));
1092 if (res_creds == NULL) {
1093 krb5_set_error_message(context, ENOMEM,
1094 N_("malloc: out of memory", ""));
1095 return ENOMEM;
1096 }
1097
1098 if (in_creds->session.keytype)
1099 options |= KRB5_TC_MATCH_KEYTYPE;
1100
1101 /*
1102 * If we got a credential, check if credential is expired before
1103 * returning it.
1104 */
1105 ret = krb5_cc_retrieve_cred(context,
1106 ccache,
1107 in_creds->session.keytype ?
1108 KRB5_TC_MATCH_KEYTYPE : 0,
1109 in_creds, res_creds);
1110 /*
1111 * If we got a credential, check if credential is expired before
1112 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1113 */
1114 if (ret == 0) {
1115 krb5_timestamp timeret;
1116
1117 /* If expired ok, don't bother checking */
1118 if(options & KRB5_GC_EXPIRED_OK) {
1119 *out_creds = res_creds;
1120 return 0;
1121 }
1122
1123 krb5_timeofday(context, &timeret);
1124 if(res_creds->times.endtime > timeret) {
1125 *out_creds = res_creds;
1126 return 0;
1127 }
1128 if(options & KRB5_GC_CACHED)
1129 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1130
1131 } else if(ret != KRB5_CC_END) {
1132 free(res_creds);
1133 return ret;
1134 }
1135 free(res_creds);
1136 if(options & KRB5_GC_CACHED)
1137 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
1138
1139 if(options & KRB5_GC_USER_USER)
1140 flags.b.enc_tkt_in_skey = 1;
1141 if (flags.b.enc_tkt_in_skey)
1142 options |= KRB5_GC_NO_STORE;
1143
1144 tgts = NULL;
1145 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1146 in_creds, NULL, NULL, out_creds, &tgts);
1147 for(i = 0; tgts && tgts[i]; i++) {
1148 krb5_cc_store_cred(context, ccache, tgts[i]);
1149 krb5_free_creds(context, tgts[i]);
1150 }
1151 free(tgts);
1152 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1153 krb5_cc_store_cred(context, ccache, *out_creds);
1154 return ret;
1155 }
1156
1157 krb5_error_code KRB5_LIB_FUNCTION
1158 krb5_get_credentials(krb5_context context,
1159 krb5_flags options,
1160 krb5_ccache ccache,
1161 krb5_creds *in_creds,
1162 krb5_creds **out_creds)
1163 {
1164 krb5_kdc_flags flags;
1165 flags.i = 0;
1166 return krb5_get_credentials_with_flags(context, options, flags,
1167 ccache, in_creds, out_creds);
1168 }
1169
1170 struct krb5_get_creds_opt_data {
1171 krb5_principal self;
1172 krb5_flags options;
1173 krb5_enctype enctype;
1174 Ticket *ticket;
1175 };
1176
1177
1178 krb5_error_code KRB5_LIB_FUNCTION
1179 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1180 {
1181 *opt = calloc(1, sizeof(**opt));
1182 if (*opt == NULL) {
1183 krb5_set_error_message(context, ENOMEM,
1184 N_("malloc: out of memory", ""));
1185 return ENOMEM;
1186 }
1187 return 0;
1188 }
1189
1190 void KRB5_LIB_FUNCTION
1191 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1192 {
1193 if (opt->self)
1194 krb5_free_principal(context, opt->self);
1195 if (opt->ticket) {
1196 free_Ticket(opt->ticket);
1197 free(opt->ticket);
1198 }
1199 memset(opt, 0, sizeof(*opt));
1200 free(opt);
1201 }
1202
1203 void KRB5_LIB_FUNCTION
1204 krb5_get_creds_opt_set_options(krb5_context context,
1205 krb5_get_creds_opt opt,
1206 krb5_flags options)
1207 {
1208 opt->options = options;
1209 }
1210
1211 void KRB5_LIB_FUNCTION
1212 krb5_get_creds_opt_add_options(krb5_context context,
1213 krb5_get_creds_opt opt,
1214 krb5_flags options)
1215 {
1216 opt->options |= options;
1217 }
1218
1219 void KRB5_LIB_FUNCTION
1220 krb5_get_creds_opt_set_enctype(krb5_context context,
1221 krb5_get_creds_opt opt,
1222 krb5_enctype enctype)
1223 {
1224 opt->enctype = enctype;
1225 }
1226
1227 krb5_error_code KRB5_LIB_FUNCTION
1228 krb5_get_creds_opt_set_impersonate(krb5_context context,
1229 krb5_get_creds_opt opt,
1230 krb5_const_principal self)
1231 {
1232 if (opt->self)
1233 krb5_free_principal(context, opt->self);
1234 return krb5_copy_principal(context, self, &opt->self);
1235 }
1236
1237 krb5_error_code KRB5_LIB_FUNCTION
1238 krb5_get_creds_opt_set_ticket(krb5_context context,
1239 krb5_get_creds_opt opt,
1240 const Ticket *ticket)
1241 {
1242 if (opt->ticket) {
1243 free_Ticket(opt->ticket);
1244 free(opt->ticket);
1245 opt->ticket = NULL;
1246 }
1247 if (ticket) {
1248 krb5_error_code ret;
1249
1250 opt->ticket = malloc(sizeof(*ticket));
1251 if (opt->ticket == NULL) {
1252 krb5_set_error_message(context, ENOMEM,
1253 N_("malloc: out of memory", ""));
1254 return ENOMEM;
1255 }
1256 ret = copy_Ticket(ticket, opt->ticket);
1257 if (ret) {
1258 free(opt->ticket);
1259 opt->ticket = NULL;
1260 krb5_set_error_message(context, ret,
1261 N_("malloc: out of memory", ""));
1262 return ret;
1263 }
1264 }
1265 return 0;
1266 }
1267
1268
1269
1270 krb5_error_code KRB5_LIB_FUNCTION
1271 krb5_get_creds(krb5_context context,
1272 krb5_get_creds_opt opt,
1273 krb5_ccache ccache,
1274 krb5_const_principal inprinc,
1275 krb5_creds **out_creds)
1276 {
1277 krb5_kdc_flags flags;
1278 krb5_flags options;
1279 krb5_creds in_creds;
1280 krb5_error_code ret;
1281 krb5_creds **tgts;
1282 krb5_creds *res_creds;
1283 int i;
1284
1285 memset(&in_creds, 0, sizeof(in_creds));
1286 in_creds.server = rk_UNCONST(inprinc);
1287
1288 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1289 if (ret)
1290 return ret;
1291
1292 options = opt->options;
1293 flags.i = 0;
1294
1295 *out_creds = NULL;
1296 res_creds = calloc(1, sizeof(*res_creds));
1297 if (res_creds == NULL) {
1298 krb5_free_principal(context, in_creds.client);
1299 krb5_set_error_message(context, ENOMEM,
1300 N_("malloc: out of memory", ""));
1301 return ENOMEM;
1302 }
1303
1304 if (opt->enctype) {
1305 in_creds.session.keytype = opt->enctype;
1306 options |= KRB5_TC_MATCH_KEYTYPE;
1307 }
1308
1309 /*
1310 * If we got a credential, check if credential is expired before
1311 * returning it.
1312 */
1313 ret = krb5_cc_retrieve_cred(context,
1314 ccache,
1315 opt->enctype ? KRB5_TC_MATCH_KEYTYPE : 0,
1316 &in_creds, res_creds);
1317 /*
1318 * If we got a credential, check if credential is expired before
1319 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1320 */
1321 if (ret == 0) {
1322 krb5_timestamp timeret;
1323
1324 /* If expired ok, don't bother checking */
1325 if(options & KRB5_GC_EXPIRED_OK) {
1326 *out_creds = res_creds;
1327 krb5_free_principal(context, in_creds.client);
1328 return 0;
1329 }
1330
1331 krb5_timeofday(context, &timeret);
1332 if(res_creds->times.endtime > timeret) {
1333 *out_creds = res_creds;
1334 krb5_free_principal(context, in_creds.client);
1335 return 0;
1336 }
1337 if(options & KRB5_GC_CACHED)
1338 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1339
1340 } else if(ret != KRB5_CC_END) {
1341 free(res_creds);
1342 krb5_free_principal(context, in_creds.client);
1343 return ret;
1344 }
1345 free(res_creds);
1346 if(options & KRB5_GC_CACHED) {
1347 krb5_free_principal(context, in_creds.client);
1348 return not_found(context, in_creds.server, KRB5_CC_NOTFOUND);
1349 }
1350 if(options & KRB5_GC_USER_USER) {
1351 flags.b.enc_tkt_in_skey = 1;
1352 options |= KRB5_GC_NO_STORE;
1353 }
1354 if (options & KRB5_GC_FORWARDABLE)
1355 flags.b.forwardable = 1;
1356 if (options & KRB5_GC_NO_TRANSIT_CHECK)
1357 flags.b.disable_transited_check = 1;
1358 if (options & KRB5_GC_CONSTRAINED_DELEGATION) {
1359 flags.b.request_anonymous = 1; /* XXX ARGH confusion */
1360 flags.b.constrained_delegation = 1;
1361 }
1362 if (options & KRB5_GC_CANONICALIZE)
1363 flags.b.canonicalize = 1;
1364
1365 tgts = NULL;
1366 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1367 &in_creds, opt->self, opt->ticket,
1368 out_creds, &tgts);
1369 krb5_free_principal(context, in_creds.client);
1370 for(i = 0; tgts && tgts[i]; i++) {
1371 krb5_cc_store_cred(context, ccache, tgts[i]);
1372 krb5_free_creds(context, tgts[i]);
1373 }
1374 free(tgts);
1375 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1376 krb5_cc_store_cred(context, ccache, *out_creds);
1377 return ret;
1378 }
1379
1380 /*
1381 *
1382 */
1383
1384 krb5_error_code KRB5_LIB_FUNCTION
1385 krb5_get_renewed_creds(krb5_context context,
1386 krb5_creds *creds,
1387 krb5_const_principal client,
1388 krb5_ccache ccache,
1389 const char *in_tkt_service)
1390 {
1391 krb5_error_code ret;
1392 krb5_kdc_flags flags;
1393 krb5_creds in, *template, *out = NULL;
1394
1395 memset(&in, 0, sizeof(in));
1396 memset(creds, 0, sizeof(*creds));
1397
1398 ret = krb5_copy_principal(context, client, &in.client);
1399 if (ret)
1400 return ret;
1401
1402 if (in_tkt_service) {
1403 ret = krb5_parse_name(context, in_tkt_service, &in.server);
1404 if (ret) {
1405 krb5_free_principal(context, in.client);
1406 return ret;
1407 }
1408 } else {
1409 const char *realm = krb5_principal_get_realm(context, client);
1410
1411 ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1412 realm, NULL);
1413 if (ret) {
1414 krb5_free_principal(context, in.client);
1415 return ret;
1416 }
1417 }
1418
1419 flags.i = 0;
1420 flags.b.renewable = flags.b.renew = 1;
1421
1422 /*
1423 * Get template from old credential cache for the same entry, if
1424 * this failes, no worries.
1425 */
1426 ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
1427 if (ret == 0) {
1428 flags.b.forwardable = template->flags.b.forwardable;
1429 flags.b.proxiable = template->flags.b.proxiable;
1430 krb5_free_creds (context, template);
1431 }
1432
1433 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
1434 krb5_free_principal(context, in.client);
1435 krb5_free_principal(context, in.server);
1436 if (ret)
1437 return ret;
1438
1439 ret = krb5_copy_creds_contents(context, out, creds);
1440 krb5_free_creds(context, out);
1441
1442 return ret;
1443 }
Heimdal