1 /*
2 * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37 #include <assert.h>
38
39 static krb5_error_code
40 get_cred_kdc_capath(krb5_context, krb5_kdc_flags,
41 krb5_ccache, krb5_creds *, krb5_principal,
42 Ticket *, krb5_creds **, krb5_creds ***);
43
44 /*
45 * Take the `body' and encode it into `padata' using the credentials
46 * in `creds'.
47 */
48
49 static krb5_error_code
make_pa_tgs_req(krb5_context context,krb5_auth_context ac,KDC_REQ_BODY * body,PA_DATA * padata,krb5_creds * creds)50 make_pa_tgs_req(krb5_context context,
51 krb5_auth_context ac,
52 KDC_REQ_BODY *body,
53 PA_DATA *padata,
54 krb5_creds *creds)
55 {
56 u_char *buf;
57 size_t buf_size;
58 size_t len = 0;
59 krb5_data in_data;
60 krb5_error_code ret;
61
62 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, body, &len, ret);
63 if (ret)
64 goto out;
65 if(buf_size != len)
66 krb5_abortx(context, "internal error in ASN.1 encoder");
67
68 in_data.length = len;
69 in_data.data = buf;
70 ret = _krb5_mk_req_internal(context, &ac, 0, &in_data, creds,
71 &padata->padata_value,
72 KRB5_KU_TGS_REQ_AUTH_CKSUM,
73 KRB5_KU_TGS_REQ_AUTH);
74 out:
75 free (buf);
76 if(ret)
77 return ret;
78 padata->padata_type = KRB5_PADATA_TGS_REQ;
79 return 0;
80 }
81
82 /*
83 * Set the `enc-authorization-data' in `req_body' based on `authdata'
84 */
85
86 static krb5_error_code
set_auth_data(krb5_context context,KDC_REQ_BODY * req_body,krb5_authdata * authdata,krb5_keyblock * subkey)87 set_auth_data (krb5_context context,
88 KDC_REQ_BODY *req_body,
89 krb5_authdata *authdata,
90 krb5_keyblock *subkey)
91 {
92 if(authdata->len) {
93 size_t len = 0, buf_size;
94 unsigned char *buf;
95 krb5_crypto crypto;
96 krb5_error_code ret;
97
98 ASN1_MALLOC_ENCODE(AuthorizationData, buf, buf_size, authdata,
99 &len, ret);
100 if (ret)
101 return ret;
102 if (buf_size != len)
103 krb5_abortx(context, "internal error in ASN.1 encoder");
104
105 ALLOC(req_body->enc_authorization_data, 1);
106 if (req_body->enc_authorization_data == NULL) {
107 free (buf);
108 krb5_set_error_message(context, ENOMEM,
109 N_("malloc: out of memory", ""));
110 return ENOMEM;
111 }
112 ret = krb5_crypto_init(context, subkey, 0, &crypto);
113 if (ret) {
114 free (buf);
115 free (req_body->enc_authorization_data);
116 req_body->enc_authorization_data = NULL;
117 return ret;
118 }
119 krb5_encrypt_EncryptedData(context,
120 crypto,
121 KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
122 buf,
123 len,
124 0,
125 req_body->enc_authorization_data);
126 free (buf);
127 krb5_crypto_destroy(context, crypto);
128 } else {
129 req_body->enc_authorization_data = NULL;
130 }
131 return 0;
132 }
133
134 /*
135 * Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
136 * (if not-NULL), `in_creds', `krbtgt', and returning the generated
137 * subkey in `subkey'.
138 */
139
140 static krb5_error_code
init_tgs_req(krb5_context context,krb5_ccache ccache,krb5_addresses * addresses,krb5_kdc_flags flags,Ticket * second_ticket,krb5_creds * in_creds,krb5_creds * krbtgt,unsigned nonce,const METHOD_DATA * padata,krb5_keyblock ** subkey,TGS_REQ * t)141 init_tgs_req (krb5_context context,
142 krb5_ccache ccache,
143 krb5_addresses *addresses,
144 krb5_kdc_flags flags,
145 Ticket *second_ticket,
146 krb5_creds *in_creds,
147 krb5_creds *krbtgt,
148 unsigned nonce,
149 const METHOD_DATA *padata,
150 krb5_keyblock **subkey,
151 TGS_REQ *t)
152 {
153 krb5_auth_context ac = NULL;
154 krb5_error_code ret = 0;
155
156 memset(t, 0, sizeof(*t));
157 t->pvno = 5;
158 t->msg_type = krb_tgs_req;
159 if (in_creds->session.keytype) {
160 ALLOC_SEQ(&t->req_body.etype, 1);
161 if(t->req_body.etype.val == NULL) {
162 ret = ENOMEM;
163 krb5_set_error_message(context, ret,
164 N_("malloc: out of memory", ""));
165 goto fail;
166 }
167 t->req_body.etype.val[0] = in_creds->session.keytype;
168 } else {
169 ret = _krb5_init_etype(context,
170 KRB5_PDU_TGS_REQUEST,
171 &t->req_body.etype.len,
172 &t->req_body.etype.val,
173 NULL);
174 }
175 if (ret)
176 goto fail;
177 t->req_body.addresses = addresses;
178 t->req_body.kdc_options = flags.b;
179 ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
180 if (ret)
181 goto fail;
182 ALLOC(t->req_body.sname, 1);
183 if (t->req_body.sname == NULL) {
184 ret = ENOMEM;
185 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
186 goto fail;
187 }
188
189 /* some versions of some code might require that the client be
190 present in TGS-REQs, but this is clearly against the spec */
191
192 ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
193 if (ret)
194 goto fail;
195
196 /* req_body.till should be NULL if there is no endtime specified,
197 but old MIT code (like DCE secd) doesn't like that */
198 ALLOC(t->req_body.till, 1);
199 if(t->req_body.till == NULL){
200 ret = ENOMEM;
201 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
202 goto fail;
203 }
204 *t->req_body.till = in_creds->times.endtime;
205
206 t->req_body.nonce = nonce;
207 if(second_ticket){
208 ALLOC(t->req_body.additional_tickets, 1);
209 if (t->req_body.additional_tickets == NULL) {
210 ret = ENOMEM;
211 krb5_set_error_message(context, ret,
212 N_("malloc: out of memory", ""));
213 goto fail;
214 }
215 ALLOC_SEQ(t->req_body.additional_tickets, 1);
216 if (t->req_body.additional_tickets->val == NULL) {
217 ret = ENOMEM;
218 krb5_set_error_message(context, ret,
219 N_("malloc: out of memory", ""));
220 goto fail;
221 }
222 ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
223 if (ret)
224 goto fail;
225 }
226 ALLOC(t->padata, 1);
227 if (t->padata == NULL) {
228 ret = ENOMEM;
229 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
230 goto fail;
231 }
232 ALLOC_SEQ(t->padata, 1 + padata->len);
233 if (t->padata->val == NULL) {
234 ret = ENOMEM;
235 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
236 goto fail;
237 }
238 {
239 size_t i;
240 for (i = 0; i < padata->len; i++) {
241 ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
242 if (ret) {
243 krb5_set_error_message(context, ret,
244 N_("malloc: out of memory", ""));
245 goto fail;
246 }
247 }
248 }
249
250 ret = krb5_auth_con_init(context, &ac);
251 if(ret)
252 goto fail;
253
254 ret = krb5_auth_con_generatelocalsubkey(context, ac, &krbtgt->session);
255 if (ret)
256 goto fail;
257
258 ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
259 ac->local_subkey);
260 if (ret)
261 goto fail;
262
263 ret = make_pa_tgs_req(context,
264 ac,
265 &t->req_body,
266 &t->padata->val[0],
267 krbtgt);
268 if(ret)
269 goto fail;
270
271 ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
272 if (ret)
273 goto fail;
274
275 fail:
276 if (ac)
277 krb5_auth_con_free(context, ac);
278 if (ret) {
279 t->req_body.addresses = NULL;
280 free_TGS_REQ (t);
281 }
282 return ret;
283 }
284
285 krb5_error_code
_krb5_get_krbtgt(krb5_context context,krb5_ccache id,krb5_realm realm,krb5_creds ** cred)286 _krb5_get_krbtgt(krb5_context context,
287 krb5_ccache id,
288 krb5_realm realm,
289 krb5_creds **cred)
290 {
291 krb5_error_code ret;
292 krb5_creds tmp_cred;
293
294 memset(&tmp_cred, 0, sizeof(tmp_cred));
295
296 ret = krb5_cc_get_principal(context, id, &tmp_cred.client);
297 if (ret)
298 return ret;
299
300 ret = krb5_make_principal(context,
301 &tmp_cred.server,
302 realm,
303 KRB5_TGS_NAME,
304 realm,
305 NULL);
306 if(ret) {
307 krb5_free_principal(context, tmp_cred.client);
308 return ret;
309 }
310 ret = krb5_get_credentials(context,
311 KRB5_GC_CACHED,
312 id,
313 &tmp_cred,
314 cred);
315 krb5_free_principal(context, tmp_cred.client);
316 krb5_free_principal(context, tmp_cred.server);
317 if(ret)
318 return ret;
319 return 0;
320 }
321
322 /* DCE compatible decrypt proc */
323 static krb5_error_code KRB5_CALLCONV
decrypt_tkt_with_subkey(krb5_context context,krb5_keyblock * key,krb5_key_usage usage,krb5_const_pointer skey,krb5_kdc_rep * dec_rep)324 decrypt_tkt_with_subkey (krb5_context context,
325 krb5_keyblock *key,
326 krb5_key_usage usage,
327 krb5_const_pointer skey,
328 krb5_kdc_rep *dec_rep)
329 {
330 const krb5_keyblock *subkey = skey;
331 krb5_error_code ret = 0;
332 krb5_data data;
333 size_t size;
334 krb5_crypto crypto;
335
336 assert(usage == 0);
337
338 krb5_data_zero(&data);
339
340 /*
341 * start out with trying with subkey if we have one
342 */
343 if (subkey) {
344 ret = krb5_crypto_init(context, subkey, 0, &crypto);
345 if (ret)
346 return ret;
347 ret = krb5_decrypt_EncryptedData (context,
348 crypto,
349 KRB5_KU_TGS_REP_ENC_PART_SUB_KEY,
350 &dec_rep->kdc_rep.enc_part,
351 &data);
352 /*
353 * If the is Windows 2000 DC, we need to retry with key usage
354 * 8 when doing ARCFOUR.
355 */
356 if (ret && subkey->keytype == ETYPE_ARCFOUR_HMAC_MD5) {
357 ret = krb5_decrypt_EncryptedData(context,
358 crypto,
359 8,
360 &dec_rep->kdc_rep.enc_part,
361 &data);
362 }
363 krb5_crypto_destroy(context, crypto);
364 }
365 if (subkey == NULL || ret) {
366 ret = krb5_crypto_init(context, key, 0, &crypto);
367 if (ret)
368 return ret;
369 ret = krb5_decrypt_EncryptedData (context,
370 crypto,
371 KRB5_KU_TGS_REP_ENC_PART_SESSION,
372 &dec_rep->kdc_rep.enc_part,
373 &data);
374 krb5_crypto_destroy(context, crypto);
375 }
376 if (ret)
377 return ret;
378
379 ret = decode_EncASRepPart(data.data,
380 data.length,
381 &dec_rep->enc_part,
382 &size);
383 if (ret)
384 ret = decode_EncTGSRepPart(data.data,
385 data.length,
386 &dec_rep->enc_part,
387 &size);
388 if (ret)
389 krb5_set_error_message(context, ret,
390 N_("Failed to decode encpart in ticket", ""));
391 krb5_data_free (&data);
392 return ret;
393 }
394
395 static krb5_error_code
get_cred_kdc(krb5_context context,krb5_ccache id,krb5_kdc_flags flags,krb5_addresses * addresses,krb5_creds * in_creds,krb5_creds * krbtgt,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds * out_creds)396 get_cred_kdc(krb5_context context,
397 krb5_ccache id,
398 krb5_kdc_flags flags,
399 krb5_addresses *addresses,
400 krb5_creds *in_creds,
401 krb5_creds *krbtgt,
402 krb5_principal impersonate_principal,
403 Ticket *second_ticket,
404 krb5_creds *out_creds)
405 {
406 TGS_REQ req;
407 krb5_data enc;
408 krb5_data resp;
409 krb5_kdc_rep rep;
410 KRB_ERROR error;
411 krb5_error_code ret;
412 unsigned nonce;
413 krb5_keyblock *subkey = NULL;
414 size_t len = 0;
415 Ticket second_ticket_data;
416 METHOD_DATA padata;
417
418 krb5_data_zero(&resp);
419 krb5_data_zero(&enc);
420 padata.val = NULL;
421 padata.len = 0;
422
423 krb5_generate_random_block(&nonce, sizeof(nonce));
424 nonce &= 0xffffffff;
425
426 if(flags.b.enc_tkt_in_skey && second_ticket == NULL){
427 ret = decode_Ticket(in_creds->second_ticket.data,
428 in_creds->second_ticket.length,
429 &second_ticket_data, &len);
430 if(ret)
431 return ret;
432 second_ticket = &second_ticket_data;
433 }
434
435
436 if (impersonate_principal) {
437 krb5_crypto crypto;
438 PA_S4U2Self self;
439 krb5_data data;
440 void *buf;
441 size_t size = 0;
442
443 self.name = impersonate_principal->name;
444 self.realm = impersonate_principal->realm;
445 self.auth = estrdup("Kerberos");
446
447 ret = _krb5_s4u2self_to_checksumdata(context, &self, &data);
448 if (ret) {
449 free(self.auth);
450 goto out;
451 }
452
453 ret = krb5_crypto_init(context, &krbtgt->session, 0, &crypto);
454 if (ret) {
455 free(self.auth);
456 krb5_data_free(&data);
457 goto out;
458 }
459
460 ret = krb5_create_checksum(context,
461 crypto,
462 KRB5_KU_OTHER_CKSUM,
463 0,
464 data.data,
465 data.length,
466 &self.cksum);
467 krb5_crypto_destroy(context, crypto);
468 krb5_data_free(&data);
469 if (ret) {
470 free(self.auth);
471 goto out;
472 }
473
474 ASN1_MALLOC_ENCODE(PA_S4U2Self, buf, len, &self, &size, ret);
475 free(self.auth);
476 free_Checksum(&self.cksum);
477 if (ret)
478 goto out;
479 if (len != size)
480 krb5_abortx(context, "internal asn1 error");
481
482 ret = krb5_padata_add(context, &padata, KRB5_PADATA_FOR_USER, buf, len);
483 if (ret)
484 goto out;
485 }
486
487 ret = init_tgs_req (context,
488 id,
489 addresses,
490 flags,
491 second_ticket,
492 in_creds,
493 krbtgt,
494 nonce,
495 &padata,
496 &subkey,
497 &req);
498 if (ret)
499 goto out;
500
501 ASN1_MALLOC_ENCODE(TGS_REQ, enc.data, enc.length, &req, &len, ret);
502 if (ret)
503 goto out;
504 if(enc.length != len)
505 krb5_abortx(context, "internal error in ASN.1 encoder");
506
507 /* don't free addresses */
508 req.req_body.addresses = NULL;
509 free_TGS_REQ(&req);
510
511 /*
512 * Send and receive
513 */
514 {
515 krb5_sendto_ctx stctx;
516 ret = krb5_sendto_ctx_alloc(context, &stctx);
517 if (ret)
518 return ret;
519 krb5_sendto_ctx_set_func(stctx, _krb5_kdc_retry, NULL);
520
521 ret = krb5_sendto_context (context, stctx, &enc,
522 krbtgt->server->name.name_string.val[1],
523 &resp);
524 krb5_sendto_ctx_free(context, stctx);
525 }
526 if(ret)
527 goto out;
528
529 memset(&rep, 0, sizeof(rep));
530 if(decode_TGS_REP(resp.data, resp.length, &rep.kdc_rep, &len) == 0) {
531 unsigned eflags = 0;
532
533 ret = krb5_copy_principal(context,
534 in_creds->client,
535 &out_creds->client);
536 if(ret)
537 goto out2;
538 ret = krb5_copy_principal(context,
539 in_creds->server,
540 &out_creds->server);
541 if(ret)
542 goto out2;
543 /* this should go someplace else */
544 out_creds->times.endtime = in_creds->times.endtime;
545
546 /* XXX should do better testing */
547 if (flags.b.constrained_delegation || impersonate_principal)
548 eflags |= EXTRACT_TICKET_ALLOW_CNAME_MISMATCH;
549
550 ret = _krb5_extract_ticket(context,
551 &rep,
552 out_creds,
553 &krbtgt->session,
554 NULL,
555 0,
556 &krbtgt->addresses,
557 nonce,
558 eflags,
559 decrypt_tkt_with_subkey,
560 subkey);
561 out2:
562 krb5_free_kdc_rep(context, &rep);
563 } else if(krb5_rd_error(context, &resp, &error) == 0) {
564 ret = krb5_error_from_rd_error(context, &error, in_creds);
565 krb5_free_error_contents(context, &error);
566 } else if(resp.length > 0 && ((char*)resp.data)[0] == 4) {
567 ret = KRB5KRB_AP_ERR_V4_REPLY;
568 krb5_clear_error_message(context);
569 } else {
570 ret = KRB5KRB_AP_ERR_MSG_TYPE;
571 krb5_clear_error_message(context);
572 }
573
574 out:
575 if (second_ticket == &second_ticket_data)
576 free_Ticket(&second_ticket_data);
577 free_METHOD_DATA(&padata);
578 krb5_data_free(&resp);
579 krb5_data_free(&enc);
580 if(subkey)
581 krb5_free_keyblock(context, subkey);
582 return ret;
583
584 }
585
586 /*
587 * same as above, just get local addresses first if the krbtgt have
588 * them and the realm is not addressless
589 */
590
591 static krb5_error_code
get_cred_kdc_address(krb5_context context,krb5_ccache id,krb5_kdc_flags flags,krb5_addresses * addrs,krb5_creds * in_creds,krb5_creds * krbtgt,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds * out_creds)592 get_cred_kdc_address(krb5_context context,
593 krb5_ccache id,
594 krb5_kdc_flags flags,
595 krb5_addresses *addrs,
596 krb5_creds *in_creds,
597 krb5_creds *krbtgt,
598 krb5_principal impersonate_principal,
599 Ticket *second_ticket,
600 krb5_creds *out_creds)
601 {
602 krb5_error_code ret;
603 krb5_addresses addresses = { 0, NULL };
604
605 /*
606 * Inherit the address-ness of the krbtgt if the address is not
607 * specified.
608 */
609
610 if (addrs == NULL && krbtgt->addresses.len != 0) {
611 krb5_boolean noaddr;
612
613 krb5_appdefault_boolean(context, NULL, krbtgt->server->realm,
614 "no-addresses", FALSE, &noaddr);
615
616 if (!noaddr) {
617 krb5_get_all_client_addrs(context, &addresses);
618 /* XXX this sucks. */
619 addrs = &addresses;
620 if(addresses.len == 0)
621 addrs = NULL;
622 }
623 }
624 ret = get_cred_kdc(context, id, flags, addrs, in_creds,
625 krbtgt, impersonate_principal,
626 second_ticket, out_creds);
627 krb5_free_addresses(context, &addresses);
628 return ret;
629 }
630
631 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_kdc_cred(krb5_context context,krb5_ccache id,krb5_kdc_flags flags,krb5_addresses * addresses,Ticket * second_ticket,krb5_creds * in_creds,krb5_creds ** out_creds)632 krb5_get_kdc_cred(krb5_context context,
633 krb5_ccache id,
634 krb5_kdc_flags flags,
635 krb5_addresses *addresses,
636 Ticket *second_ticket,
637 krb5_creds *in_creds,
638 krb5_creds **out_creds
639 )
640 {
641 krb5_error_code ret;
642 krb5_creds *krbtgt;
643
644 *out_creds = calloc(1, sizeof(**out_creds));
645 if(*out_creds == NULL) {
646 krb5_set_error_message(context, ENOMEM,
647 N_("malloc: out of memory", ""));
648 return ENOMEM;
649 }
650 ret = _krb5_get_krbtgt (context,
651 id,
652 in_creds->server->realm,
653 &krbtgt);
654 if(ret) {
655 free(*out_creds);
656 *out_creds = NULL;
657 return ret;
658 }
659 ret = get_cred_kdc(context, id, flags, addresses,
660 in_creds, krbtgt, NULL, NULL, *out_creds);
661 krb5_free_creds (context, krbtgt);
662 if(ret) {
663 free(*out_creds);
664 *out_creds = NULL;
665 }
666 return ret;
667 }
668
669 static int
not_found(krb5_context context,krb5_const_principal p,krb5_error_code code)670 not_found(krb5_context context, krb5_const_principal p, krb5_error_code code)
671 {
672 krb5_error_code ret;
673 char *str;
674
675 ret = krb5_unparse_name(context, p, &str);
676 if(ret) {
677 krb5_clear_error_message(context);
678 return code;
679 }
680 krb5_set_error_message(context, code,
681 N_("Matching credential (%s) not found", ""), str);
682 free(str);
683 return code;
684 }
685
686 static krb5_error_code
find_cred(krb5_context context,krb5_ccache id,krb5_principal server,krb5_creds ** tgts,krb5_creds * out_creds)687 find_cred(krb5_context context,
688 krb5_ccache id,
689 krb5_principal server,
690 krb5_creds **tgts,
691 krb5_creds *out_creds)
692 {
693 krb5_error_code ret;
694 krb5_creds mcreds;
695
696 krb5_cc_clear_mcred(&mcreds);
697 mcreds.server = server;
698 ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
699 &mcreds, out_creds);
700 if(ret == 0)
701 return 0;
702 while(tgts && *tgts){
703 if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
704 &mcreds, *tgts)){
705 ret = krb5_copy_creds_contents(context, *tgts, out_creds);
706 return ret;
707 }
708 tgts++;
709 }
710 return not_found(context, server, KRB5_CC_NOTFOUND);
711 }
712
713 static krb5_error_code
add_cred(krb5_context context,krb5_creds const * tkt,krb5_creds *** tgts)714 add_cred(krb5_context context, krb5_creds const *tkt, krb5_creds ***tgts)
715 {
716 int i;
717 krb5_error_code ret;
718 krb5_creds **tmp = *tgts;
719
720 for(i = 0; tmp && tmp[i]; i++); /* XXX */
721 tmp = realloc(tmp, (i+2)*sizeof(*tmp));
722 if(tmp == NULL) {
723 krb5_set_error_message(context, ENOMEM,
724 N_("malloc: out of memory", ""));
725 return ENOMEM;
726 }
727 *tgts = tmp;
728 ret = krb5_copy_creds(context, tkt, &tmp[i]);
729 tmp[i+1] = NULL;
730 return ret;
731 }
732
733 static krb5_error_code
get_cred_kdc_capath_worker(krb5_context context,krb5_kdc_flags flags,krb5_ccache ccache,krb5_creds * in_creds,krb5_const_realm try_realm,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds ** out_creds,krb5_creds *** ret_tgts)734 get_cred_kdc_capath_worker(krb5_context context,
735 krb5_kdc_flags flags,
736 krb5_ccache ccache,
737 krb5_creds *in_creds,
738 krb5_const_realm try_realm,
739 krb5_principal impersonate_principal,
740 Ticket *second_ticket,
741 krb5_creds **out_creds,
742 krb5_creds ***ret_tgts)
743 {
744 krb5_error_code ret;
745 krb5_creds *tgt, tmp_creds;
746 krb5_const_realm client_realm, server_realm;
747 int ok_as_delegate = 1;
748
749 *out_creds = NULL;
750
751 client_realm = krb5_principal_get_realm(context, in_creds->client);
752 server_realm = krb5_principal_get_realm(context, in_creds->server);
753 memset(&tmp_creds, 0, sizeof(tmp_creds));
754 ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
755 if(ret)
756 return ret;
757
758 ret = krb5_make_principal(context,
759 &tmp_creds.server,
760 try_realm,
761 KRB5_TGS_NAME,
762 server_realm,
763 NULL);
764 if(ret){
765 krb5_free_principal(context, tmp_creds.client);
766 return ret;
767 }
768 {
769 krb5_creds tgts;
770
771 ret = find_cred(context, ccache, tmp_creds.server,
772 *ret_tgts, &tgts);
773 if(ret == 0){
774 /* only allow implicit ok_as_delegate if the realm is the clients realm */
775 if (strcmp(try_realm, client_realm) != 0 || strcmp(try_realm, server_realm) != 0)
776 ok_as_delegate = tgts.flags.b.ok_as_delegate;
777
778 *out_creds = calloc(1, sizeof(**out_creds));
779 if(*out_creds == NULL) {
780 ret = ENOMEM;
781 krb5_set_error_message(context, ret,
782 N_("malloc: out of memory", ""));
783 } else {
784 ret = get_cred_kdc_address(context, ccache, flags, NULL,
785 in_creds, &tgts,
786 impersonate_principal,
787 second_ticket,
788 *out_creds);
789 if (ret) {
790 free (*out_creds);
791 *out_creds = NULL;
792 } else if (ok_as_delegate == 0)
793 (*out_creds)->flags.b.ok_as_delegate = 0;
794 }
795 krb5_free_cred_contents(context, &tgts);
796 krb5_free_principal(context, tmp_creds.server);
797 krb5_free_principal(context, tmp_creds.client);
798 return ret;
799 }
800 }
801 if(krb5_realm_compare(context, in_creds->client, in_creds->server))
802 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
803
804 /* XXX this can loop forever */
805 while(1){
806 heim_general_string tgt_inst;
807
808 ret = get_cred_kdc_capath(context, flags, ccache, &tmp_creds,
809 NULL, NULL, &tgt, ret_tgts);
810 if(ret) {
811 krb5_free_principal(context, tmp_creds.server);
812 krb5_free_principal(context, tmp_creds.client);
813 return ret;
814 }
815 /*
816 * if either of the chain or the ok_as_delegate was stripped
817 * by the kdc, make sure we strip it too.
818 */
819 if (ok_as_delegate == 0 || tgt->flags.b.ok_as_delegate == 0) {
820 ok_as_delegate = 0;
821 tgt->flags.b.ok_as_delegate = 0;
822 }
823
824 ret = add_cred(context, tgt, ret_tgts);
825 if(ret) {
826 krb5_free_principal(context, tmp_creds.server);
827 krb5_free_principal(context, tmp_creds.client);
828 return ret;
829 }
830 tgt_inst = tgt->server->name.name_string.val[1];
831 if(strcmp(tgt_inst, server_realm) == 0)
832 break;
833 krb5_free_principal(context, tmp_creds.server);
834 tmp_creds.server = NULL;
835 ret = krb5_make_principal(context, &tmp_creds.server,
836 tgt_inst, KRB5_TGS_NAME, server_realm, NULL);
837 if(ret) {
838 krb5_free_principal(context, tmp_creds.server);
839 krb5_free_principal(context, tmp_creds.client);
840 return ret;
841 }
842 ret = krb5_free_creds(context, tgt);
843 if(ret) {
844 krb5_free_principal(context, tmp_creds.server);
845 krb5_free_principal(context, tmp_creds.client);
846 return ret;
847 }
848 }
849
850 krb5_free_principal(context, tmp_creds.server);
851 krb5_free_principal(context, tmp_creds.client);
852 *out_creds = calloc(1, sizeof(**out_creds));
853 if(*out_creds == NULL) {
854 ret = ENOMEM;
855 krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
856 } else {
857 ret = get_cred_kdc_address (context, ccache, flags, NULL,
858 in_creds, tgt, impersonate_principal,
859 second_ticket, *out_creds);
860 if (ret) {
861 free (*out_creds);
862 *out_creds = NULL;
863 }
864 }
865 krb5_free_creds(context, tgt);
866 return ret;
867 }
868
869 /*
870 get_cred(server)
871 creds = cc_get_cred(server)
872 if(creds) return creds
873 tgt = cc_get_cred(krbtgt/server_realm@any_realm)
874 if(tgt)
875 return get_cred_tgt(server, tgt)
876 if(client_realm == server_realm)
877 return NULL
878 tgt = get_cred(krbtgt/server_realm@client_realm)
879 while(tgt_inst != server_realm)
880 tgt = get_cred(krbtgt/server_realm@tgt_inst)
881 return get_cred_tgt(server, tgt)
882 */
883
884 static krb5_error_code
get_cred_kdc_capath(krb5_context context,krb5_kdc_flags flags,krb5_ccache ccache,krb5_creds * in_creds,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds ** out_creds,krb5_creds *** ret_tgts)885 get_cred_kdc_capath(krb5_context context,
886 krb5_kdc_flags flags,
887 krb5_ccache ccache,
888 krb5_creds *in_creds,
889 krb5_principal impersonate_principal,
890 Ticket *second_ticket,
891 krb5_creds **out_creds,
892 krb5_creds ***ret_tgts)
893 {
894 krb5_error_code ret;
895 krb5_const_realm client_realm, server_realm, try_realm;
896
897 client_realm = krb5_principal_get_realm(context, in_creds->client);
898 server_realm = krb5_principal_get_realm(context, in_creds->server);
899
900 try_realm = client_realm;
901 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds, try_realm,
902 impersonate_principal, second_ticket, out_creds,
903 ret_tgts);
904
905 if (ret == KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN) {
906 try_realm = krb5_config_get_string(context, NULL, "capaths",
907 client_realm, server_realm, NULL);
908
909 if (try_realm != NULL && strcmp(try_realm, client_realm)) {
910 ret = get_cred_kdc_capath_worker(context, flags, ccache, in_creds,
911 try_realm, impersonate_principal,
912 second_ticket, out_creds, ret_tgts);
913 }
914 }
915
916 return ret;
917 }
918
919 static krb5_error_code
get_cred_kdc_referral(krb5_context context,krb5_kdc_flags flags,krb5_ccache ccache,krb5_creds * in_creds,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds ** out_creds,krb5_creds *** ret_tgts)920 get_cred_kdc_referral(krb5_context context,
921 krb5_kdc_flags flags,
922 krb5_ccache ccache,
923 krb5_creds *in_creds,
924 krb5_principal impersonate_principal,
925 Ticket *second_ticket,
926 krb5_creds **out_creds,
927 krb5_creds ***ret_tgts)
928 {
929 krb5_const_realm client_realm;
930 krb5_error_code ret;
931 krb5_creds tgt, referral, ticket;
932 int loop = 0;
933 int ok_as_delegate = 1;
934
935 if (in_creds->server->name.name_string.len < 2 && !flags.b.canonicalize) {
936 krb5_set_error_message(context, KRB5KDC_ERR_PATH_NOT_ACCEPTED,
937 N_("Name too short to do referals, skipping", ""));
938 return KRB5KDC_ERR_PATH_NOT_ACCEPTED;
939 }
940
941 memset(&tgt, 0, sizeof(tgt));
942 memset(&ticket, 0, sizeof(ticket));
943
944 flags.b.canonicalize = 1;
945
946 *out_creds = NULL;
947
948 client_realm = krb5_principal_get_realm(context, in_creds->client);
949
950 /* find tgt for the clients base realm */
951 {
952 krb5_principal tgtname;
953
954 ret = krb5_make_principal(context, &tgtname,
955 client_realm,
956 KRB5_TGS_NAME,
957 client_realm,
958 NULL);
959 if(ret)
960 return ret;
961
962 ret = find_cred(context, ccache, tgtname, *ret_tgts, &tgt);
963 krb5_free_principal(context, tgtname);
964 if (ret)
965 return ret;
966 }
967
968 referral = *in_creds;
969 ret = krb5_copy_principal(context, in_creds->server, &referral.server);
970 if (ret) {
971 krb5_free_cred_contents(context, &tgt);
972 return ret;
973 }
974 ret = krb5_principal_set_realm(context, referral.server, client_realm);
975 if (ret) {
976 krb5_free_cred_contents(context, &tgt);
977 krb5_free_principal(context, referral.server);
978 return ret;
979 }
980
981 while (loop++ < 17) {
982 krb5_creds **tickets;
983 krb5_creds mcreds;
984 char *referral_realm;
985
986 /* Use cache if we are not doing impersonation or contrainte deleg */
987 if (impersonate_principal == NULL || flags.b.constrained_delegation) {
988 krb5_cc_clear_mcred(&mcreds);
989 mcreds.server = referral.server;
990 ret = krb5_cc_retrieve_cred(context, ccache, 0, &mcreds, &ticket);
991 } else
992 ret = EINVAL;
993
994 if (ret) {
995 ret = get_cred_kdc_address(context, ccache, flags, NULL,
996 &referral, &tgt, impersonate_principal,
997 second_ticket, &ticket);
998 if (ret)
999 goto out;
1000 }
1001
1002 /* Did we get the right ticket ? */
1003 if (krb5_principal_compare_any_realm(context,
1004 referral.server,
1005 ticket.server))
1006 break;
1007
1008 if (!krb5_principal_is_krbtgt(context, ticket.server)) {
1009 krb5_set_error_message(context, KRB5KRB_AP_ERR_NOT_US,
1010 N_("Got back an non krbtgt "
1011 "ticket referrals", ""));
1012 ret = KRB5KRB_AP_ERR_NOT_US;
1013 goto out;
1014 }
1015
1016 referral_realm = ticket.server->name.name_string.val[1];
1017
1018 /* check that there are no referrals loops */
1019 tickets = *ret_tgts;
1020
1021 krb5_cc_clear_mcred(&mcreds);
1022 mcreds.server = ticket.server;
1023
1024 while(tickets && *tickets){
1025 if(krb5_compare_creds(context,
1026 KRB5_TC_DONT_MATCH_REALM,
1027 &mcreds,
1028 *tickets))
1029 {
1030 krb5_set_error_message(context, KRB5_GET_IN_TKT_LOOP,
1031 N_("Referral from %s "
1032 "loops back to realm %s", ""),
1033 tgt.server->realm,
1034 referral_realm);
1035 ret = KRB5_GET_IN_TKT_LOOP;
1036 goto out;
1037 }
1038 tickets++;
1039 }
1040
1041 /*
1042 * if either of the chain or the ok_as_delegate was stripped
1043 * by the kdc, make sure we strip it too.
1044 */
1045
1046 if (ok_as_delegate == 0 || ticket.flags.b.ok_as_delegate == 0) {
1047 ok_as_delegate = 0;
1048 ticket.flags.b.ok_as_delegate = 0;
1049 }
1050
1051 ret = add_cred(context, &ticket, ret_tgts);
1052 if (ret)
1053 goto out;
1054
1055 /* try realm in the referral */
1056 ret = krb5_principal_set_realm(context,
1057 referral.server,
1058 referral_realm);
1059 krb5_free_cred_contents(context, &tgt);
1060 tgt = ticket;
1061 memset(&ticket, 0, sizeof(ticket));
1062 if (ret)
1063 goto out;
1064 }
1065
1066 ret = krb5_copy_creds(context, &ticket, out_creds);
1067
1068 out:
1069 krb5_free_principal(context, referral.server);
1070 krb5_free_cred_contents(context, &tgt);
1071 krb5_free_cred_contents(context, &ticket);
1072 return ret;
1073 }
1074
1075
1076 /*
1077 * Glue function between referrals version and old client chasing
1078 * codebase.
1079 */
1080
1081 krb5_error_code
_krb5_get_cred_kdc_any(krb5_context context,krb5_kdc_flags flags,krb5_ccache ccache,krb5_creds * in_creds,krb5_principal impersonate_principal,Ticket * second_ticket,krb5_creds ** out_creds,krb5_creds *** ret_tgts)1082 _krb5_get_cred_kdc_any(krb5_context context,
1083 krb5_kdc_flags flags,
1084 krb5_ccache ccache,
1085 krb5_creds *in_creds,
1086 krb5_principal impersonate_principal,
1087 Ticket *second_ticket,
1088 krb5_creds **out_creds,
1089 krb5_creds ***ret_tgts)
1090 {
1091 krb5_error_code ret;
1092 krb5_deltat offset;
1093
1094 ret = krb5_cc_get_kdc_offset(context, ccache, &offset);
1095 if (ret) {
1096 context->kdc_sec_offset = offset;
1097 context->kdc_usec_offset = 0;
1098 }
1099
1100 ret = get_cred_kdc_referral(context,
1101 flags,
1102 ccache,
1103 in_creds,
1104 impersonate_principal,
1105 second_ticket,
1106 out_creds,
1107 ret_tgts);
1108 if (ret == 0 || flags.b.canonicalize)
1109 return ret;
1110 return get_cred_kdc_capath(context,
1111 flags,
1112 ccache,
1113 in_creds,
1114 impersonate_principal,
1115 second_ticket,
1116 out_creds,
1117 ret_tgts);
1118 }
1119
1120
1121 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_credentials_with_flags(krb5_context context,krb5_flags options,krb5_kdc_flags flags,krb5_ccache ccache,krb5_creds * in_creds,krb5_creds ** out_creds)1122 krb5_get_credentials_with_flags(krb5_context context,
1123 krb5_flags options,
1124 krb5_kdc_flags flags,
1125 krb5_ccache ccache,
1126 krb5_creds *in_creds,
1127 krb5_creds **out_creds)
1128 {
1129 krb5_error_code ret;
1130 krb5_creds **tgts;
1131 krb5_creds *res_creds;
1132 int i;
1133
1134 if (in_creds->session.keytype) {
1135 ret = krb5_enctype_valid(context, in_creds->session.keytype);
1136 if (ret)
1137 return ret;
1138 }
1139
1140 *out_creds = NULL;
1141 res_creds = calloc(1, sizeof(*res_creds));
1142 if (res_creds == NULL) {
1143 krb5_set_error_message(context, ENOMEM,
1144 N_("malloc: out of memory", ""));
1145 return ENOMEM;
1146 }
1147
1148 if (in_creds->session.keytype)
1149 options |= KRB5_TC_MATCH_KEYTYPE;
1150
1151 /*
1152 * If we got a credential, check if credential is expired before
1153 * returning it.
1154 */
1155 ret = krb5_cc_retrieve_cred(context,
1156 ccache,
1157 in_creds->session.keytype ?
1158 KRB5_TC_MATCH_KEYTYPE : 0,
1159 in_creds, res_creds);
1160 /*
1161 * If we got a credential, check if credential is expired before
1162 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1163 */
1164 if (ret == 0) {
1165 krb5_timestamp timeret;
1166
1167 /* If expired ok, don't bother checking */
1168 if(options & KRB5_GC_EXPIRED_OK) {
1169 *out_creds = res_creds;
1170 return 0;
1171 }
1172
1173 krb5_timeofday(context, &timeret);
1174 if(res_creds->times.endtime > timeret) {
1175 *out_creds = res_creds;
1176 return 0;
1177 }
1178 if(options & KRB5_GC_CACHED)
1179 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1180
1181 } else if(ret != KRB5_CC_END) {
1182 free(res_creds);
1183 return ret;
1184 }
1185 free(res_creds);
1186 if(options & KRB5_GC_CACHED)
1187 return not_found(context, in_creds->server, KRB5_CC_NOTFOUND);
1188
1189 if(options & KRB5_GC_USER_USER)
1190 flags.b.enc_tkt_in_skey = 1;
1191 if (flags.b.enc_tkt_in_skey)
1192 options |= KRB5_GC_NO_STORE;
1193
1194 tgts = NULL;
1195 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1196 in_creds, NULL, NULL, out_creds, &tgts);
1197 for(i = 0; tgts && tgts[i]; i++) {
1198 krb5_cc_store_cred(context, ccache, tgts[i]);
1199 krb5_free_creds(context, tgts[i]);
1200 }
1201 free(tgts);
1202 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1203 krb5_cc_store_cred(context, ccache, *out_creds);
1204 return ret;
1205 }
1206
1207 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_credentials(krb5_context context,krb5_flags options,krb5_ccache ccache,krb5_creds * in_creds,krb5_creds ** out_creds)1208 krb5_get_credentials(krb5_context context,
1209 krb5_flags options,
1210 krb5_ccache ccache,
1211 krb5_creds *in_creds,
1212 krb5_creds **out_creds)
1213 {
1214 krb5_kdc_flags flags;
1215 flags.i = 0;
1216 return krb5_get_credentials_with_flags(context, options, flags,
1217 ccache, in_creds, out_creds);
1218 }
1219
1220 struct krb5_get_creds_opt_data {
1221 krb5_principal self;
1222 krb5_flags options;
1223 krb5_enctype enctype;
1224 Ticket *ticket;
1225 };
1226
1227
1228 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_creds_opt_alloc(krb5_context context,krb5_get_creds_opt * opt)1229 krb5_get_creds_opt_alloc(krb5_context context, krb5_get_creds_opt *opt)
1230 {
1231 *opt = calloc(1, sizeof(**opt));
1232 if (*opt == NULL) {
1233 krb5_set_error_message(context, ENOMEM,
1234 N_("malloc: out of memory", ""));
1235 return ENOMEM;
1236 }
1237 return 0;
1238 }
1239
1240 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_get_creds_opt_free(krb5_context context,krb5_get_creds_opt opt)1241 krb5_get_creds_opt_free(krb5_context context, krb5_get_creds_opt opt)
1242 {
1243 if (opt->self)
1244 krb5_free_principal(context, opt->self);
1245 if (opt->ticket) {
1246 free_Ticket(opt->ticket);
1247 free(opt->ticket);
1248 }
1249 memset(opt, 0, sizeof(*opt));
1250 free(opt);
1251 }
1252
1253 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_get_creds_opt_set_options(krb5_context context,krb5_get_creds_opt opt,krb5_flags options)1254 krb5_get_creds_opt_set_options(krb5_context context,
1255 krb5_get_creds_opt opt,
1256 krb5_flags options)
1257 {
1258 opt->options = options;
1259 }
1260
1261 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_get_creds_opt_add_options(krb5_context context,krb5_get_creds_opt opt,krb5_flags options)1262 krb5_get_creds_opt_add_options(krb5_context context,
1263 krb5_get_creds_opt opt,
1264 krb5_flags options)
1265 {
1266 opt->options |= options;
1267 }
1268
1269 KRB5_LIB_FUNCTION void KRB5_LIB_CALL
krb5_get_creds_opt_set_enctype(krb5_context context,krb5_get_creds_opt opt,krb5_enctype enctype)1270 krb5_get_creds_opt_set_enctype(krb5_context context,
1271 krb5_get_creds_opt opt,
1272 krb5_enctype enctype)
1273 {
1274 opt->enctype = enctype;
1275 }
1276
1277 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_creds_opt_set_impersonate(krb5_context context,krb5_get_creds_opt opt,krb5_const_principal self)1278 krb5_get_creds_opt_set_impersonate(krb5_context context,
1279 krb5_get_creds_opt opt,
1280 krb5_const_principal self)
1281 {
1282 if (opt->self)
1283 krb5_free_principal(context, opt->self);
1284 return krb5_copy_principal(context, self, &opt->self);
1285 }
1286
1287 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_creds_opt_set_ticket(krb5_context context,krb5_get_creds_opt opt,const Ticket * ticket)1288 krb5_get_creds_opt_set_ticket(krb5_context context,
1289 krb5_get_creds_opt opt,
1290 const Ticket *ticket)
1291 {
1292 if (opt->ticket) {
1293 free_Ticket(opt->ticket);
1294 free(opt->ticket);
1295 opt->ticket = NULL;
1296 }
1297 if (ticket) {
1298 krb5_error_code ret;
1299
1300 opt->ticket = malloc(sizeof(*ticket));
1301 if (opt->ticket == NULL) {
1302 krb5_set_error_message(context, ENOMEM,
1303 N_("malloc: out of memory", ""));
1304 return ENOMEM;
1305 }
1306 ret = copy_Ticket(ticket, opt->ticket);
1307 if (ret) {
1308 free(opt->ticket);
1309 opt->ticket = NULL;
1310 krb5_set_error_message(context, ret,
1311 N_("malloc: out of memory", ""));
1312 return ret;
1313 }
1314 }
1315 return 0;
1316 }
1317
1318
1319
1320 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_creds(krb5_context context,krb5_get_creds_opt opt,krb5_ccache ccache,krb5_const_principal inprinc,krb5_creds ** out_creds)1321 krb5_get_creds(krb5_context context,
1322 krb5_get_creds_opt opt,
1323 krb5_ccache ccache,
1324 krb5_const_principal inprinc,
1325 krb5_creds **out_creds)
1326 {
1327 krb5_kdc_flags flags;
1328 krb5_flags options;
1329 krb5_creds in_creds;
1330 krb5_error_code ret;
1331 krb5_creds **tgts;
1332 krb5_creds *res_creds;
1333 int i;
1334
1335 if (opt && opt->enctype) {
1336 ret = krb5_enctype_valid(context, opt->enctype);
1337 if (ret)
1338 return ret;
1339 }
1340
1341 memset(&in_creds, 0, sizeof(in_creds));
1342 in_creds.server = rk_UNCONST(inprinc);
1343
1344 ret = krb5_cc_get_principal(context, ccache, &in_creds.client);
1345 if (ret)
1346 return ret;
1347
1348 if (opt)
1349 options = opt->options;
1350 else
1351 options = 0;
1352 flags.i = 0;
1353
1354 *out_creds = NULL;
1355 res_creds = calloc(1, sizeof(*res_creds));
1356 if (res_creds == NULL) {
1357 krb5_free_principal(context, in_creds.client);
1358 krb5_set_error_message(context, ENOMEM,
1359 N_("malloc: out of memory", ""));
1360 return ENOMEM;
1361 }
1362
1363 if (opt && opt->enctype) {
1364 in_creds.session.keytype = opt->enctype;
1365 options |= KRB5_TC_MATCH_KEYTYPE;
1366 }
1367
1368 /*
1369 * If we got a credential, check if credential is expired before
1370 * returning it.
1371 */
1372 ret = krb5_cc_retrieve_cred(context,
1373 ccache,
1374 options & KRB5_TC_MATCH_KEYTYPE,
1375 &in_creds, res_creds);
1376 /*
1377 * If we got a credential, check if credential is expired before
1378 * returning it, but only if KRB5_GC_EXPIRED_OK is not set.
1379 */
1380 if (ret == 0) {
1381 krb5_timestamp timeret;
1382
1383 /* If expired ok, don't bother checking */
1384 if(options & KRB5_GC_EXPIRED_OK) {
1385 *out_creds = res_creds;
1386 krb5_free_principal(context, in_creds.client);
1387 goto out;
1388 }
1389
1390 krb5_timeofday(context, &timeret);
1391 if(res_creds->times.endtime > timeret) {
1392 *out_creds = res_creds;
1393 krb5_free_principal(context, in_creds.client);
1394 goto out;
1395 }
1396 if(options & KRB5_GC_CACHED)
1397 krb5_cc_remove_cred(context, ccache, 0, res_creds);
1398
1399 } else if(ret != KRB5_CC_END) {
1400 free(res_creds);
1401 krb5_free_principal(context, in_creds.client);
1402 goto out;
1403 }
1404 free(res_creds);
1405 if(options & KRB5_GC_CACHED) {
1406 krb5_free_principal(context, in_creds.client);
1407 ret = not_found(context, in_creds.server, KRB5_CC_NOTFOUND);
1408 goto out;
1409 }
1410 if(options & KRB5_GC_USER_USER) {
1411 flags.b.enc_tkt_in_skey = 1;
1412 options |= KRB5_GC_NO_STORE;
1413 }
1414 if (options & KRB5_GC_FORWARDABLE)
1415 flags.b.forwardable = 1;
1416 if (options & KRB5_GC_NO_TRANSIT_CHECK)
1417 flags.b.disable_transited_check = 1;
1418 if (options & KRB5_GC_CONSTRAINED_DELEGATION) {
1419 flags.b.request_anonymous = 1; /* XXX ARGH confusion */
1420 flags.b.constrained_delegation = 1;
1421 }
1422 if (options & KRB5_GC_CANONICALIZE)
1423 flags.b.canonicalize = 1;
1424
1425 tgts = NULL;
1426 ret = _krb5_get_cred_kdc_any(context, flags, ccache,
1427 &in_creds, opt->self, opt->ticket,
1428 out_creds, &tgts);
1429 krb5_free_principal(context, in_creds.client);
1430 for(i = 0; tgts && tgts[i]; i++) {
1431 krb5_cc_store_cred(context, ccache, tgts[i]);
1432 krb5_free_creds(context, tgts[i]);
1433 }
1434 free(tgts);
1435 if(ret == 0 && (options & KRB5_GC_NO_STORE) == 0)
1436 krb5_cc_store_cred(context, ccache, *out_creds);
1437
1438 out:
1439 _krb5_debug(context, 5, "krb5_get_creds: ret = %d", ret);
1440
1441 return ret;
1442 }
1443
1444 /*
1445 *
1446 */
1447
1448 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_get_renewed_creds(krb5_context context,krb5_creds * creds,krb5_const_principal client,krb5_ccache ccache,const char * in_tkt_service)1449 krb5_get_renewed_creds(krb5_context context,
1450 krb5_creds *creds,
1451 krb5_const_principal client,
1452 krb5_ccache ccache,
1453 const char *in_tkt_service)
1454 {
1455 krb5_error_code ret;
1456 krb5_kdc_flags flags;
1457 krb5_creds in, *template, *out = NULL;
1458
1459 memset(&in, 0, sizeof(in));
1460 memset(creds, 0, sizeof(*creds));
1461
1462 ret = krb5_copy_principal(context, client, &in.client);
1463 if (ret)
1464 return ret;
1465
1466 if (in_tkt_service) {
1467 ret = krb5_parse_name(context, in_tkt_service, &in.server);
1468 if (ret) {
1469 krb5_free_principal(context, in.client);
1470 return ret;
1471 }
1472 } else {
1473 const char *realm = krb5_principal_get_realm(context, client);
1474
1475 ret = krb5_make_principal(context, &in.server, realm, KRB5_TGS_NAME,
1476 realm, NULL);
1477 if (ret) {
1478 krb5_free_principal(context, in.client);
1479 return ret;
1480 }
1481 }
1482
1483 flags.i = 0;
1484 flags.b.renewable = flags.b.renew = 1;
1485
1486 /*
1487 * Get template from old credential cache for the same entry, if
1488 * this failes, no worries.
1489 */
1490 ret = krb5_get_credentials(context, KRB5_GC_CACHED, ccache, &in, &template);
1491 if (ret == 0) {
1492 flags.b.forwardable = template->flags.b.forwardable;
1493 flags.b.proxiable = template->flags.b.proxiable;
1494 krb5_free_creds (context, template);
1495 }
1496
1497 ret = krb5_get_kdc_cred(context, ccache, flags, NULL, NULL, &in, &out);
1498 krb5_free_principal(context, in.client);
1499 krb5_free_principal(context, in.server);
1500 if (ret)
1501 return ret;
1502
1503 ret = krb5_copy_creds_contents(context, out, creds);
1504 krb5_free_creds(context, out);
1505
1506 return ret;
1507 }
1508