asn1: check overflow against SIZE_MAX not +1
[heimdal.git] / kdc / pkinit.c
blobcd2067532dfcdf9cb0a507e9fc81ac3363882d91
1 /*
2 * Copyright (c) 2003 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
36 #include "kdc_locl.h"
38 #ifdef PKINIT
40 #include <heim_asn1.h>
41 #include <rfc2459_asn1.h>
42 #include <cms_asn1.h>
43 #include <pkinit_asn1.h>
45 #include <hx509.h>
46 #include "crypto-headers.h"
48 struct pk_client_params {
49 enum krb5_pk_type type;
50 enum { USE_RSA, USE_DH, USE_ECDH } keyex;
51 union {
52 struct {
53 BIGNUM *public_key;
54 DH *key;
55 } dh;
56 #ifdef HAVE_OPENSSL
57 struct {
58 EC_KEY *public_key;
59 EC_KEY *key;
60 } ecdh;
61 #endif
62 } u;
63 hx509_cert cert;
64 unsigned nonce;
65 EncryptionKey reply_key;
66 char *dh_group_name;
67 hx509_peer_info peer;
68 hx509_certs client_anchors;
69 hx509_verify_ctx verify_ctx;
72 struct pk_principal_mapping {
73 unsigned int len;
74 struct pk_allowed_princ {
75 krb5_principal principal;
76 char *subject;
77 } *val;
80 static struct krb5_pk_identity *kdc_identity;
81 static struct pk_principal_mapping principal_mappings;
82 static struct krb5_dh_moduli **moduli;
84 static struct {
85 krb5_data data;
86 time_t expire;
87 time_t next_update;
88 } ocsp;
94 static krb5_error_code
95 pk_check_pkauthenticator_win2k(krb5_context context,
96 PKAuthenticator_Win2k *a,
97 const KDC_REQ *req)
99 krb5_timestamp now;
101 krb5_timeofday (context, &now);
103 /* XXX cusec */
104 if (a->ctime == 0 || abs(a->ctime - now) > context->max_skew) {
105 krb5_clear_error_message(context);
106 return KRB5KRB_AP_ERR_SKEW;
108 return 0;
111 static krb5_error_code
112 pk_check_pkauthenticator(krb5_context context,
113 PKAuthenticator *a,
114 const KDC_REQ *req)
116 u_char *buf = NULL;
117 size_t buf_size;
118 krb5_error_code ret;
119 size_t len = 0;
120 krb5_timestamp now;
121 Checksum checksum;
123 krb5_timeofday (context, &now);
125 /* XXX cusec */
126 if (a->ctime == 0 || abs(a->ctime - now) > context->max_skew) {
127 krb5_clear_error_message(context);
128 return KRB5KRB_AP_ERR_SKEW;
131 ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, &req->req_body, &len, ret);
132 if (ret) {
133 krb5_clear_error_message(context);
134 return ret;
136 if (buf_size != len)
137 krb5_abortx(context, "Internal error in ASN.1 encoder");
139 ret = krb5_create_checksum(context,
140 NULL,
142 CKSUMTYPE_SHA1,
143 buf,
144 len,
145 &checksum);
146 free(buf);
147 if (ret) {
148 krb5_clear_error_message(context);
149 return ret;
152 if (a->paChecksum == NULL) {
153 krb5_clear_error_message(context);
154 ret = KRB5_KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED;
155 goto out;
158 if (der_heim_octet_string_cmp(a->paChecksum, &checksum.checksum) != 0) {
159 krb5_clear_error_message(context);
160 ret = KRB5KRB_ERR_GENERIC;
163 out:
164 free_Checksum(&checksum);
166 return ret;
169 void
170 _kdc_pk_free_client_param(krb5_context context, pk_client_params *cp)
172 if (cp == NULL)
173 return;
174 if (cp->cert)
175 hx509_cert_free(cp->cert);
176 if (cp->verify_ctx)
177 hx509_verify_destroy_ctx(cp->verify_ctx);
178 if (cp->keyex == USE_DH) {
179 if (cp->u.dh.key)
180 DH_free(cp->u.dh.key);
181 if (cp->u.dh.public_key)
182 BN_free(cp->u.dh.public_key);
184 #ifdef HAVE_OPENSSL
185 if (cp->keyex == USE_ECDH) {
186 if (cp->u.ecdh.key)
187 EC_KEY_free(cp->u.ecdh.key);
188 if (cp->u.ecdh.public_key)
189 EC_KEY_free(cp->u.ecdh.public_key);
191 #endif
192 krb5_free_keyblock_contents(context, &cp->reply_key);
193 if (cp->dh_group_name)
194 free(cp->dh_group_name);
195 if (cp->peer)
196 hx509_peer_info_free(cp->peer);
197 if (cp->client_anchors)
198 hx509_certs_free(&cp->client_anchors);
199 memset(cp, 0, sizeof(*cp));
200 free(cp);
203 static krb5_error_code
204 generate_dh_keyblock(krb5_context context,
205 pk_client_params *client_params,
206 krb5_enctype enctype)
208 unsigned char *dh_gen_key = NULL;
209 krb5_keyblock key;
210 krb5_error_code ret;
211 size_t dh_gen_keylen, size;
213 memset(&key, 0, sizeof(key));
215 if (client_params->keyex == USE_DH) {
217 if (client_params->u.dh.public_key == NULL) {
218 ret = KRB5KRB_ERR_GENERIC;
219 krb5_set_error_message(context, ret, "public_key");
220 goto out;
223 if (!DH_generate_key(client_params->u.dh.key)) {
224 ret = KRB5KRB_ERR_GENERIC;
225 krb5_set_error_message(context, ret,
226 "Can't generate Diffie-Hellman keys");
227 goto out;
230 size = DH_size(client_params->u.dh.key);
232 dh_gen_key = malloc(size);
233 if (dh_gen_key == NULL) {
234 ret = ENOMEM;
235 krb5_set_error_message(context, ret, "malloc: out of memory");
236 goto out;
239 dh_gen_keylen = DH_compute_key(dh_gen_key,client_params->u.dh.public_key, client_params->u.dh.key);
240 if (dh_gen_keylen == (size_t)-1) {
241 ret = KRB5KRB_ERR_GENERIC;
242 krb5_set_error_message(context, ret,
243 "Can't compute Diffie-Hellman key");
244 goto out;
246 if (dh_gen_keylen < size) {
247 size -= dh_gen_keylen;
248 memmove(dh_gen_key + size, dh_gen_key, dh_gen_keylen);
249 memset(dh_gen_key, 0, size);
252 ret = 0;
253 #ifdef HAVE_OPENSSL
254 } else if (client_params->keyex == USE_ECDH) {
256 if (client_params->u.ecdh.public_key == NULL) {
257 ret = KRB5KRB_ERR_GENERIC;
258 krb5_set_error_message(context, ret, "public_key");
259 goto out;
262 client_params->u.ecdh.key = EC_KEY_new();
263 if (client_params->u.ecdh.key == NULL) {
264 ret = ENOMEM;
265 goto out;
267 EC_KEY_set_group(client_params->u.ecdh.key,
268 EC_KEY_get0_group(client_params->u.ecdh.public_key));
270 if (EC_KEY_generate_key(client_params->u.ecdh.key) != 1) {
271 ret = ENOMEM;
272 goto out;
275 size = (EC_GROUP_get_degree(EC_KEY_get0_group(client_params->u.ecdh.key)) + 7) / 8;
276 dh_gen_key = malloc(size);
277 if (dh_gen_key == NULL) {
278 ret = ENOMEM;
279 krb5_set_error_message(context, ret,
280 N_("malloc: out of memory", ""));
281 goto out;
284 dh_gen_keylen = ECDH_compute_key(dh_gen_key, size,
285 EC_KEY_get0_public_key(client_params->u.ecdh.public_key),
286 client_params->u.ecdh.key, NULL);
288 #endif /* HAVE_OPENSSL */
289 } else {
290 ret = KRB5KRB_ERR_GENERIC;
291 krb5_set_error_message(context, ret,
292 "Diffie-Hellman not selected keys");
293 goto out;
296 ret = _krb5_pk_octetstring2key(context,
297 enctype,
298 dh_gen_key, dh_gen_keylen,
299 NULL, NULL,
300 &client_params->reply_key);
302 out:
303 if (dh_gen_key)
304 free(dh_gen_key);
305 if (key.keyvalue.data)
306 krb5_free_keyblock_contents(context, &key);
308 return ret;
311 static BIGNUM *
312 integer_to_BN(krb5_context context, const char *field, heim_integer *f)
314 BIGNUM *bn;
316 bn = BN_bin2bn((const unsigned char *)f->data, f->length, NULL);
317 if (bn == NULL) {
318 krb5_set_error_message(context, KRB5_BADMSGTYPE,
319 "PKINIT: parsing BN failed %s", field);
320 return NULL;
322 BN_set_negative(bn, f->negative);
323 return bn;
326 static krb5_error_code
327 get_dh_param(krb5_context context,
328 krb5_kdc_configuration *config,
329 SubjectPublicKeyInfo *dh_key_info,
330 pk_client_params *client_params)
332 DomainParameters dhparam;
333 DH *dh = NULL;
334 krb5_error_code ret;
336 memset(&dhparam, 0, sizeof(dhparam));
338 if ((dh_key_info->subjectPublicKey.length % 8) != 0) {
339 ret = KRB5_BADMSGTYPE;
340 krb5_set_error_message(context, ret,
341 "PKINIT: subjectPublicKey not aligned "
342 "to 8 bit boundary");
343 goto out;
346 if (dh_key_info->algorithm.parameters == NULL) {
347 krb5_set_error_message(context, KRB5_BADMSGTYPE,
348 "PKINIT missing algorithm parameter "
349 "in clientPublicValue");
350 return KRB5_BADMSGTYPE;
353 ret = decode_DomainParameters(dh_key_info->algorithm.parameters->data,
354 dh_key_info->algorithm.parameters->length,
355 &dhparam,
356 NULL);
357 if (ret) {
358 krb5_set_error_message(context, ret, "Can't decode algorithm "
359 "parameters in clientPublicValue");
360 goto out;
363 ret = _krb5_dh_group_ok(context, config->pkinit_dh_min_bits,
364 &dhparam.p, &dhparam.g, dhparam.q, moduli,
365 &client_params->dh_group_name);
366 if (ret) {
367 /* XXX send back proposal of better group */
368 goto out;
371 dh = DH_new();
372 if (dh == NULL) {
373 ret = ENOMEM;
374 krb5_set_error_message(context, ret, "Cannot create DH structure");
375 goto out;
377 ret = KRB5_BADMSGTYPE;
378 dh->p = integer_to_BN(context, "DH prime", &dhparam.p);
379 if (dh->p == NULL)
380 goto out;
381 dh->g = integer_to_BN(context, "DH base", &dhparam.g);
382 if (dh->g == NULL)
383 goto out;
385 if (dhparam.q) {
386 dh->q = integer_to_BN(context, "DH p-1 factor", dhparam.q);
387 if (dh->g == NULL)
388 goto out;
392 heim_integer glue;
393 size_t size;
395 ret = decode_DHPublicKey(dh_key_info->subjectPublicKey.data,
396 dh_key_info->subjectPublicKey.length / 8,
397 &glue,
398 &size);
399 if (ret) {
400 krb5_clear_error_message(context);
401 return ret;
404 client_params->u.dh.public_key = integer_to_BN(context,
405 "subjectPublicKey",
406 &glue);
407 der_free_heim_integer(&glue);
408 if (client_params->u.dh.public_key == NULL) {
409 ret = KRB5_BADMSGTYPE;
410 goto out;
414 client_params->u.dh.key = dh;
415 dh = NULL;
416 ret = 0;
418 out:
419 if (dh)
420 DH_free(dh);
421 free_DomainParameters(&dhparam);
422 return ret;
425 #ifdef HAVE_OPENSSL
427 static krb5_error_code
428 get_ecdh_param(krb5_context context,
429 krb5_kdc_configuration *config,
430 SubjectPublicKeyInfo *dh_key_info,
431 pk_client_params *client_params)
433 ECParameters ecp;
434 EC_KEY *public = NULL;
435 krb5_error_code ret;
436 const unsigned char *p;
437 size_t len;
438 int nid;
440 if (dh_key_info->algorithm.parameters == NULL) {
441 krb5_set_error_message(context, KRB5_BADMSGTYPE,
442 "PKINIT missing algorithm parameter "
443 "in clientPublicValue");
444 return KRB5_BADMSGTYPE;
447 memset(&ecp, 0, sizeof(ecp));
449 ret = decode_ECParameters(dh_key_info->algorithm.parameters->data,
450 dh_key_info->algorithm.parameters->length, &ecp, &len);
451 if (ret)
452 goto out;
454 if (ecp.element != choice_ECParameters_namedCurve) {
455 ret = KRB5_BADMSGTYPE;
456 goto out;
459 if (der_heim_oid_cmp(&ecp.u.namedCurve, &asn1_oid_id_ec_group_secp256r1) == 0)
460 nid = NID_X9_62_prime256v1;
461 else {
462 ret = KRB5_BADMSGTYPE;
463 goto out;
466 /* XXX verify group is ok */
468 public = EC_KEY_new_by_curve_name(nid);
470 p = dh_key_info->subjectPublicKey.data;
471 len = dh_key_info->subjectPublicKey.length / 8;
472 if (o2i_ECPublicKey(&public, &p, len) == NULL) {
473 ret = KRB5_BADMSGTYPE;
474 krb5_set_error_message(context, ret,
475 "PKINIT failed to decode ECDH key");
476 goto out;
478 client_params->u.ecdh.public_key = public;
479 public = NULL;
481 out:
482 if (public)
483 EC_KEY_free(public);
484 free_ECParameters(&ecp);
485 return ret;
488 #endif /* HAVE_OPENSSL */
490 krb5_error_code
491 _kdc_pk_rd_padata(krb5_context context,
492 krb5_kdc_configuration *config,
493 const KDC_REQ *req,
494 const PA_DATA *pa,
495 hdb_entry_ex *client,
496 pk_client_params **ret_params)
498 pk_client_params *cp;
499 krb5_error_code ret;
500 heim_oid eContentType = { 0, NULL }, contentInfoOid = { 0, NULL };
501 krb5_data eContent = { 0, NULL };
502 krb5_data signed_content = { 0, NULL };
503 const char *type = "unknown type";
504 hx509_certs trust_anchors;
505 int have_data = 0;
506 const HDB_Ext_PKINIT_cert *pc;
508 *ret_params = NULL;
510 if (!config->enable_pkinit) {
511 kdc_log(context, config, 0, "PK-INIT request but PK-INIT not enabled");
512 krb5_clear_error_message(context);
513 return 0;
516 cp = calloc(1, sizeof(*cp));
517 if (cp == NULL) {
518 krb5_clear_error_message(context);
519 ret = ENOMEM;
520 goto out;
523 ret = hx509_certs_init(context->hx509ctx,
524 "MEMORY:trust-anchors",
525 0, NULL, &trust_anchors);
526 if (ret) {
527 krb5_set_error_message(context, ret, "failed to create trust anchors");
528 goto out;
531 ret = hx509_certs_merge(context->hx509ctx, trust_anchors,
532 kdc_identity->anchors);
533 if (ret) {
534 hx509_certs_free(&trust_anchors);
535 krb5_set_error_message(context, ret, "failed to create verify context");
536 goto out;
539 /* Add any registered certificates for this client as trust anchors */
540 ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
541 if (ret == 0 && pc != NULL) {
542 hx509_cert cert;
543 unsigned int i;
545 for (i = 0; i < pc->len; i++) {
546 cert = hx509_cert_init_data(context->hx509ctx,
547 pc->val[i].cert.data,
548 pc->val[i].cert.length,
549 NULL);
550 if (cert == NULL)
551 continue;
552 hx509_certs_add(context->hx509ctx, trust_anchors, cert);
553 hx509_cert_free(cert);
557 ret = hx509_verify_init_ctx(context->hx509ctx, &cp->verify_ctx);
558 if (ret) {
559 hx509_certs_free(&trust_anchors);
560 krb5_set_error_message(context, ret, "failed to create verify context");
561 goto out;
564 hx509_verify_set_time(cp->verify_ctx, kdc_time);
565 hx509_verify_attach_anchors(cp->verify_ctx, trust_anchors);
566 hx509_certs_free(&trust_anchors);
568 if (config->pkinit_allow_proxy_certs)
569 hx509_verify_set_proxy_certificate(cp->verify_ctx, 1);
571 if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
572 PA_PK_AS_REQ_Win2k r;
574 type = "PK-INIT-Win2k";
576 if (req->req_body.kdc_options.request_anonymous) {
577 ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
578 krb5_set_error_message(context, ret,
579 "Anon not supported in RSA mode");
580 goto out;
583 ret = decode_PA_PK_AS_REQ_Win2k(pa->padata_value.data,
584 pa->padata_value.length,
586 NULL);
587 if (ret) {
588 krb5_set_error_message(context, ret, "Can't decode "
589 "PK-AS-REQ-Win2k: %d", ret);
590 goto out;
593 ret = hx509_cms_unwrap_ContentInfo(&r.signed_auth_pack,
594 &contentInfoOid,
595 &signed_content,
596 &have_data);
597 free_PA_PK_AS_REQ_Win2k(&r);
598 if (ret) {
599 krb5_set_error_message(context, ret,
600 "Can't unwrap ContentInfo(win): %d", ret);
601 goto out;
604 } else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
605 PA_PK_AS_REQ r;
607 type = "PK-INIT-IETF";
609 ret = decode_PA_PK_AS_REQ(pa->padata_value.data,
610 pa->padata_value.length,
612 NULL);
613 if (ret) {
614 krb5_set_error_message(context, ret,
615 "Can't decode PK-AS-REQ: %d", ret);
616 goto out;
619 /* XXX look at r.kdcPkId */
620 if (r.trustedCertifiers) {
621 ExternalPrincipalIdentifiers *edi = r.trustedCertifiers;
622 unsigned int i, maxedi;
624 ret = hx509_certs_init(context->hx509ctx,
625 "MEMORY:client-anchors",
626 0, NULL,
627 &cp->client_anchors);
628 if (ret) {
629 krb5_set_error_message(context, ret,
630 "Can't allocate client anchors: %d",
631 ret);
632 goto out;
636 * If the client sent more then 10 EDI, don't bother
637 * looking more then 10 of performance reasons.
639 maxedi = edi->len;
640 if (maxedi > 10)
641 maxedi = 10;
642 for (i = 0; i < maxedi; i++) {
643 IssuerAndSerialNumber iasn;
644 hx509_query *q;
645 hx509_cert cert;
646 size_t size;
648 if (edi->val[i].issuerAndSerialNumber == NULL)
649 continue;
651 ret = hx509_query_alloc(context->hx509ctx, &q);
652 if (ret) {
653 krb5_set_error_message(context, ret,
654 "Failed to allocate hx509_query");
655 goto out;
658 ret = decode_IssuerAndSerialNumber(edi->val[i].issuerAndSerialNumber->data,
659 edi->val[i].issuerAndSerialNumber->length,
660 &iasn,
661 &size);
662 if (ret) {
663 hx509_query_free(context->hx509ctx, q);
664 continue;
666 ret = hx509_query_match_issuer_serial(q, &iasn.issuer, &iasn.serialNumber);
667 free_IssuerAndSerialNumber(&iasn);
668 if (ret) {
669 hx509_query_free(context->hx509ctx, q);
670 continue;
673 ret = hx509_certs_find(context->hx509ctx,
674 kdc_identity->certs,
676 &cert);
677 hx509_query_free(context->hx509ctx, q);
678 if (ret)
679 continue;
680 hx509_certs_add(context->hx509ctx,
681 cp->client_anchors, cert);
682 hx509_cert_free(cert);
686 ret = hx509_cms_unwrap_ContentInfo(&r.signedAuthPack,
687 &contentInfoOid,
688 &signed_content,
689 &have_data);
690 free_PA_PK_AS_REQ(&r);
691 if (ret) {
692 krb5_set_error_message(context, ret,
693 "Can't unwrap ContentInfo: %d", ret);
694 goto out;
697 } else {
698 krb5_clear_error_message(context);
699 ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
700 goto out;
703 ret = der_heim_oid_cmp(&contentInfoOid, &asn1_oid_id_pkcs7_signedData);
704 if (ret != 0) {
705 ret = KRB5KRB_ERR_GENERIC;
706 krb5_set_error_message(context, ret,
707 "PK-AS-REQ-Win2k invalid content type oid");
708 goto out;
711 if (!have_data) {
712 ret = KRB5KRB_ERR_GENERIC;
713 krb5_set_error_message(context, ret,
714 "PK-AS-REQ-Win2k no signed auth pack");
715 goto out;
719 hx509_certs signer_certs;
720 int flags = HX509_CMS_VS_ALLOW_DATA_OID_MISMATCH; /* BTMM */
722 if (req->req_body.kdc_options.request_anonymous)
723 flags |= HX509_CMS_VS_ALLOW_ZERO_SIGNER;
725 ret = hx509_cms_verify_signed(context->hx509ctx,
726 cp->verify_ctx,
727 flags,
728 signed_content.data,
729 signed_content.length,
730 NULL,
731 kdc_identity->certpool,
732 &eContentType,
733 &eContent,
734 &signer_certs);
735 if (ret) {
736 char *s = hx509_get_error_string(context->hx509ctx, ret);
737 krb5_warnx(context, "PKINIT: failed to verify signature: %s: %d",
738 s, ret);
739 free(s);
740 goto out;
743 if (signer_certs) {
744 ret = hx509_get_one_cert(context->hx509ctx, signer_certs,
745 &cp->cert);
746 hx509_certs_free(&signer_certs);
748 if (ret)
749 goto out;
752 /* Signature is correct, now verify the signed message */
753 if (der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkcs7_data) != 0 &&
754 der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkauthdata) != 0)
756 ret = KRB5_BADMSGTYPE;
757 krb5_set_error_message(context, ret, "got wrong oid for pkauthdata");
758 goto out;
761 if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
762 AuthPack_Win2k ap;
764 ret = decode_AuthPack_Win2k(eContent.data,
765 eContent.length,
766 &ap,
767 NULL);
768 if (ret) {
769 krb5_set_error_message(context, ret,
770 "Can't decode AuthPack: %d", ret);
771 goto out;
774 ret = pk_check_pkauthenticator_win2k(context,
775 &ap.pkAuthenticator,
776 req);
777 if (ret) {
778 free_AuthPack_Win2k(&ap);
779 goto out;
782 cp->type = PKINIT_WIN2K;
783 cp->nonce = ap.pkAuthenticator.nonce;
785 if (ap.clientPublicValue) {
786 ret = KRB5KRB_ERR_GENERIC;
787 krb5_set_error_message(context, ret,
788 "DH not supported for windows");
789 goto out;
791 free_AuthPack_Win2k(&ap);
793 } else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
794 AuthPack ap;
796 ret = decode_AuthPack(eContent.data,
797 eContent.length,
798 &ap,
799 NULL);
800 if (ret) {
801 krb5_set_error_message(context, ret,
802 "Can't decode AuthPack: %d", ret);
803 free_AuthPack(&ap);
804 goto out;
807 if (req->req_body.kdc_options.request_anonymous &&
808 ap.clientPublicValue == NULL) {
809 free_AuthPack(&ap);
810 ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
811 krb5_set_error_message(context, ret,
812 "Anon not supported in RSA mode");
813 goto out;
816 ret = pk_check_pkauthenticator(context,
817 &ap.pkAuthenticator,
818 req);
819 if (ret) {
820 free_AuthPack(&ap);
821 goto out;
824 cp->type = PKINIT_27;
825 cp->nonce = ap.pkAuthenticator.nonce;
827 if (ap.clientPublicValue) {
828 if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_dhpublicnumber) == 0) {
829 cp->keyex = USE_DH;
830 ret = get_dh_param(context, config,
831 ap.clientPublicValue, cp);
832 #ifdef HAVE_OPENSSL
833 } else if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_ecPublicKey) == 0) {
834 cp->keyex = USE_ECDH;
835 ret = get_ecdh_param(context, config,
836 ap.clientPublicValue, cp);
837 #endif /* HAVE_OPENSSL */
838 } else {
839 ret = KRB5_BADMSGTYPE;
840 krb5_set_error_message(context, ret, "PKINIT unknown DH mechanism");
842 if (ret) {
843 free_AuthPack(&ap);
844 goto out;
846 } else
847 cp->keyex = USE_RSA;
849 ret = hx509_peer_info_alloc(context->hx509ctx,
850 &cp->peer);
851 if (ret) {
852 free_AuthPack(&ap);
853 goto out;
856 if (ap.supportedCMSTypes) {
857 ret = hx509_peer_info_set_cms_algs(context->hx509ctx,
858 cp->peer,
859 ap.supportedCMSTypes->val,
860 ap.supportedCMSTypes->len);
861 if (ret) {
862 free_AuthPack(&ap);
863 goto out;
865 } else {
866 /* assume old client */
867 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
868 hx509_crypto_des_rsdi_ede3_cbc());
869 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
870 hx509_signature_rsa_with_sha1());
871 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
872 hx509_signature_sha1());
874 free_AuthPack(&ap);
875 } else
876 krb5_abortx(context, "internal pkinit error");
878 kdc_log(context, config, 0, "PK-INIT request of type %s", type);
880 out:
881 if (ret)
882 krb5_warn(context, ret, "PKINIT");
884 if (signed_content.data)
885 free(signed_content.data);
886 krb5_data_free(&eContent);
887 der_free_oid(&eContentType);
888 der_free_oid(&contentInfoOid);
889 if (ret) {
890 _kdc_pk_free_client_param(context, cp);
891 } else
892 *ret_params = cp;
893 return ret;
900 static krb5_error_code
901 BN_to_integer(krb5_context context, BIGNUM *bn, heim_integer *integer)
903 integer->length = BN_num_bytes(bn);
904 integer->data = malloc(integer->length);
905 if (integer->data == NULL) {
906 krb5_clear_error_message(context);
907 return ENOMEM;
909 BN_bn2bin(bn, integer->data);
910 integer->negative = BN_is_negative(bn);
911 return 0;
914 static krb5_error_code
915 pk_mk_pa_reply_enckey(krb5_context context,
916 krb5_kdc_configuration *config,
917 pk_client_params *cp,
918 const KDC_REQ *req,
919 const krb5_data *req_buffer,
920 krb5_keyblock *reply_key,
921 ContentInfo *content_info,
922 hx509_cert *kdc_cert)
924 const heim_oid *envelopedAlg = NULL, *sdAlg = NULL, *evAlg = NULL;
925 krb5_error_code ret;
926 krb5_data buf, signed_data;
927 size_t size = 0;
928 int do_win2k = 0;
930 krb5_data_zero(&buf);
931 krb5_data_zero(&signed_data);
933 *kdc_cert = NULL;
936 * If the message client is a win2k-type but it send pa data
937 * 09-binding it expects a IETF (checksum) reply so there can be
938 * no replay attacks.
941 switch (cp->type) {
942 case PKINIT_WIN2K: {
943 int i = 0;
944 if (_kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_09_BINDING) == NULL
945 && config->pkinit_require_binding == 0)
947 do_win2k = 1;
949 sdAlg = &asn1_oid_id_pkcs7_data;
950 evAlg = &asn1_oid_id_pkcs7_data;
951 envelopedAlg = &asn1_oid_id_rsadsi_des_ede3_cbc;
952 break;
954 case PKINIT_27:
955 sdAlg = &asn1_oid_id_pkrkeydata;
956 evAlg = &asn1_oid_id_pkcs7_signedData;
957 break;
958 default:
959 krb5_abortx(context, "internal pkinit error");
962 if (do_win2k) {
963 ReplyKeyPack_Win2k kp;
964 memset(&kp, 0, sizeof(kp));
966 ret = copy_EncryptionKey(reply_key, &kp.replyKey);
967 if (ret) {
968 krb5_clear_error_message(context);
969 goto out;
971 kp.nonce = cp->nonce;
973 ASN1_MALLOC_ENCODE(ReplyKeyPack_Win2k,
974 buf.data, buf.length,
975 &kp, &size,ret);
976 free_ReplyKeyPack_Win2k(&kp);
977 } else {
978 krb5_crypto ascrypto;
979 ReplyKeyPack kp;
980 memset(&kp, 0, sizeof(kp));
982 ret = copy_EncryptionKey(reply_key, &kp.replyKey);
983 if (ret) {
984 krb5_clear_error_message(context);
985 goto out;
988 ret = krb5_crypto_init(context, reply_key, 0, &ascrypto);
989 if (ret) {
990 krb5_clear_error_message(context);
991 goto out;
994 ret = krb5_create_checksum(context, ascrypto, 6, 0,
995 req_buffer->data, req_buffer->length,
996 &kp.asChecksum);
997 if (ret) {
998 krb5_clear_error_message(context);
999 goto out;
1002 ret = krb5_crypto_destroy(context, ascrypto);
1003 if (ret) {
1004 krb5_clear_error_message(context);
1005 goto out;
1007 ASN1_MALLOC_ENCODE(ReplyKeyPack, buf.data, buf.length, &kp, &size,ret);
1008 free_ReplyKeyPack(&kp);
1010 if (ret) {
1011 krb5_set_error_message(context, ret, "ASN.1 encoding of ReplyKeyPack "
1012 "failed (%d)", ret);
1013 goto out;
1015 if (buf.length != size)
1016 krb5_abortx(context, "Internal ASN.1 encoder error");
1019 hx509_query *q;
1020 hx509_cert cert;
1022 ret = hx509_query_alloc(context->hx509ctx, &q);
1023 if (ret)
1024 goto out;
1026 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1027 if (config->pkinit_kdc_friendly_name)
1028 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
1030 ret = hx509_certs_find(context->hx509ctx,
1031 kdc_identity->certs,
1033 &cert);
1034 hx509_query_free(context->hx509ctx, q);
1035 if (ret)
1036 goto out;
1038 ret = hx509_cms_create_signed_1(context->hx509ctx,
1040 sdAlg,
1041 buf.data,
1042 buf.length,
1043 NULL,
1044 cert,
1045 cp->peer,
1046 cp->client_anchors,
1047 kdc_identity->certpool,
1048 &signed_data);
1049 *kdc_cert = cert;
1052 krb5_data_free(&buf);
1053 if (ret)
1054 goto out;
1056 if (cp->type == PKINIT_WIN2K) {
1057 ret = hx509_cms_wrap_ContentInfo(&asn1_oid_id_pkcs7_signedData,
1058 &signed_data,
1059 &buf);
1060 if (ret)
1061 goto out;
1062 krb5_data_free(&signed_data);
1063 signed_data = buf;
1066 ret = hx509_cms_envelope_1(context->hx509ctx,
1067 HX509_CMS_EV_NO_KU_CHECK,
1068 cp->cert,
1069 signed_data.data, signed_data.length,
1070 envelopedAlg,
1071 evAlg, &buf);
1072 if (ret)
1073 goto out;
1075 ret = _krb5_pk_mk_ContentInfo(context,
1076 &buf,
1077 &asn1_oid_id_pkcs7_envelopedData,
1078 content_info);
1079 out:
1080 if (ret && *kdc_cert) {
1081 hx509_cert_free(*kdc_cert);
1082 *kdc_cert = NULL;
1085 krb5_data_free(&buf);
1086 krb5_data_free(&signed_data);
1087 return ret;
1094 static krb5_error_code
1095 pk_mk_pa_reply_dh(krb5_context context,
1096 krb5_kdc_configuration *config,
1097 pk_client_params *cp,
1098 ContentInfo *content_info,
1099 hx509_cert *kdc_cert)
1101 KDCDHKeyInfo dh_info;
1102 krb5_data signed_data, buf;
1103 ContentInfo contentinfo;
1104 krb5_error_code ret;
1105 hx509_cert cert;
1106 hx509_query *q;
1107 size_t size = 0;
1109 memset(&contentinfo, 0, sizeof(contentinfo));
1110 memset(&dh_info, 0, sizeof(dh_info));
1111 krb5_data_zero(&signed_data);
1112 krb5_data_zero(&buf);
1114 *kdc_cert = NULL;
1116 if (cp->keyex == USE_DH) {
1117 DH *kdc_dh = cp->u.dh.key;
1118 heim_integer i;
1120 ret = BN_to_integer(context, kdc_dh->pub_key, &i);
1121 if (ret)
1122 return ret;
1124 ASN1_MALLOC_ENCODE(DHPublicKey, buf.data, buf.length, &i, &size, ret);
1125 der_free_heim_integer(&i);
1126 if (ret) {
1127 krb5_set_error_message(context, ret, "ASN.1 encoding of "
1128 "DHPublicKey failed (%d)", ret);
1129 return ret;
1131 if (buf.length != size)
1132 krb5_abortx(context, "Internal ASN.1 encoder error");
1134 dh_info.subjectPublicKey.length = buf.length * 8;
1135 dh_info.subjectPublicKey.data = buf.data;
1136 krb5_data_zero(&buf);
1137 #ifdef HAVE_OPENSSL
1138 } else if (cp->keyex == USE_ECDH) {
1139 unsigned char *p;
1140 int len;
1142 len = i2o_ECPublicKey(cp->u.ecdh.key, NULL);
1143 if (len <= 0)
1144 abort();
1146 p = malloc(len);
1147 if (p == NULL)
1148 abort();
1150 dh_info.subjectPublicKey.length = len * 8;
1151 dh_info.subjectPublicKey.data = p;
1153 len = i2o_ECPublicKey(cp->u.ecdh.key, &p);
1154 if (len <= 0)
1155 abort();
1156 #endif
1157 } else
1158 krb5_abortx(context, "no keyex selected ?");
1161 dh_info.nonce = cp->nonce;
1163 ASN1_MALLOC_ENCODE(KDCDHKeyInfo, buf.data, buf.length, &dh_info, &size,
1164 ret);
1165 if (ret) {
1166 krb5_set_error_message(context, ret, "ASN.1 encoding of "
1167 "KdcDHKeyInfo failed (%d)", ret);
1168 goto out;
1170 if (buf.length != size)
1171 krb5_abortx(context, "Internal ASN.1 encoder error");
1174 * Create the SignedData structure and sign the KdcDHKeyInfo
1175 * filled in above
1178 ret = hx509_query_alloc(context->hx509ctx, &q);
1179 if (ret)
1180 goto out;
1182 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1183 if (config->pkinit_kdc_friendly_name)
1184 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
1186 ret = hx509_certs_find(context->hx509ctx,
1187 kdc_identity->certs,
1189 &cert);
1190 hx509_query_free(context->hx509ctx, q);
1191 if (ret)
1192 goto out;
1194 ret = hx509_cms_create_signed_1(context->hx509ctx,
1196 &asn1_oid_id_pkdhkeydata,
1197 buf.data,
1198 buf.length,
1199 NULL,
1200 cert,
1201 cp->peer,
1202 cp->client_anchors,
1203 kdc_identity->certpool,
1204 &signed_data);
1205 if (ret) {
1206 kdc_log(context, config, 0, "Failed signing the DH* reply: %d", ret);
1207 goto out;
1209 *kdc_cert = cert;
1211 ret = _krb5_pk_mk_ContentInfo(context,
1212 &signed_data,
1213 &asn1_oid_id_pkcs7_signedData,
1214 content_info);
1215 if (ret)
1216 goto out;
1218 out:
1219 if (ret && *kdc_cert) {
1220 hx509_cert_free(*kdc_cert);
1221 *kdc_cert = NULL;
1224 krb5_data_free(&buf);
1225 krb5_data_free(&signed_data);
1226 free_KDCDHKeyInfo(&dh_info);
1228 return ret;
1235 krb5_error_code
1236 _kdc_pk_mk_pa_reply(krb5_context context,
1237 krb5_kdc_configuration *config,
1238 pk_client_params *cp,
1239 const hdb_entry_ex *client,
1240 krb5_enctype sessionetype,
1241 const KDC_REQ *req,
1242 const krb5_data *req_buffer,
1243 krb5_keyblock *reply_key,
1244 krb5_keyblock *sessionkey,
1245 METHOD_DATA *md)
1247 krb5_error_code ret;
1248 void *buf = NULL;
1249 size_t len = 0, size = 0;
1250 krb5_enctype enctype;
1251 int pa_type;
1252 hx509_cert kdc_cert = NULL;
1253 size_t i;
1255 if (!config->enable_pkinit) {
1256 krb5_clear_error_message(context);
1257 return 0;
1260 if (req->req_body.etype.len > 0) {
1261 for (i = 0; i < req->req_body.etype.len; i++)
1262 if (krb5_enctype_valid(context, req->req_body.etype.val[i]) == 0)
1263 break;
1264 if (req->req_body.etype.len <= i) {
1265 ret = KRB5KRB_ERR_GENERIC;
1266 krb5_set_error_message(context, ret,
1267 "No valid enctype available from client");
1268 goto out;
1270 enctype = req->req_body.etype.val[i];
1271 } else
1272 enctype = ETYPE_DES3_CBC_SHA1;
1274 if (cp->type == PKINIT_27) {
1275 PA_PK_AS_REP rep;
1276 const char *type, *other = "";
1278 memset(&rep, 0, sizeof(rep));
1280 pa_type = KRB5_PADATA_PK_AS_REP;
1282 if (cp->keyex == USE_RSA) {
1283 ContentInfo info;
1285 type = "enckey";
1287 rep.element = choice_PA_PK_AS_REP_encKeyPack;
1289 ret = krb5_generate_random_keyblock(context, enctype,
1290 &cp->reply_key);
1291 if (ret) {
1292 free_PA_PK_AS_REP(&rep);
1293 goto out;
1295 ret = pk_mk_pa_reply_enckey(context,
1296 config,
1298 req,
1299 req_buffer,
1300 &cp->reply_key,
1301 &info,
1302 &kdc_cert);
1303 if (ret) {
1304 free_PA_PK_AS_REP(&rep);
1305 goto out;
1307 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
1308 rep.u.encKeyPack.length, &info, &size,
1309 ret);
1310 free_ContentInfo(&info);
1311 if (ret) {
1312 krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
1313 "failed %d", ret);
1314 free_PA_PK_AS_REP(&rep);
1315 goto out;
1317 if (rep.u.encKeyPack.length != size)
1318 krb5_abortx(context, "Internal ASN.1 encoder error");
1320 ret = krb5_generate_random_keyblock(context, sessionetype,
1321 sessionkey);
1322 if (ret) {
1323 free_PA_PK_AS_REP(&rep);
1324 goto out;
1327 } else {
1328 ContentInfo info;
1330 switch (cp->keyex) {
1331 case USE_DH: type = "dh"; break;
1332 #ifdef HAVE_OPENSSL
1333 case USE_ECDH: type = "ecdh"; break;
1334 #endif
1335 default: krb5_abortx(context, "unknown keyex"); break;
1338 if (cp->dh_group_name)
1339 other = cp->dh_group_name;
1341 rep.element = choice_PA_PK_AS_REP_dhInfo;
1343 ret = generate_dh_keyblock(context, cp, enctype);
1344 if (ret)
1345 return ret;
1347 ret = pk_mk_pa_reply_dh(context, config,
1349 &info,
1350 &kdc_cert);
1351 if (ret) {
1352 free_PA_PK_AS_REP(&rep);
1353 krb5_set_error_message(context, ret,
1354 "create pa-reply-dh "
1355 "failed %d", ret);
1356 goto out;
1359 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.dhInfo.dhSignedData.data,
1360 rep.u.dhInfo.dhSignedData.length, &info, &size,
1361 ret);
1362 free_ContentInfo(&info);
1363 if (ret) {
1364 krb5_set_error_message(context, ret,
1365 "encoding of Key ContentInfo "
1366 "failed %d", ret);
1367 free_PA_PK_AS_REP(&rep);
1368 goto out;
1370 if (rep.u.encKeyPack.length != size)
1371 krb5_abortx(context, "Internal ASN.1 encoder error");
1373 /* XXX KRB-FX-CF2 */
1374 ret = krb5_generate_random_keyblock(context, sessionetype,
1375 sessionkey);
1376 if (ret) {
1377 free_PA_PK_AS_REP(&rep);
1378 goto out;
1381 /* XXX Add PA-PKINIT-KX */
1385 #define use_btmm_with_enckey 0
1386 if (use_btmm_with_enckey && rep.element == choice_PA_PK_AS_REP_encKeyPack) {
1387 PA_PK_AS_REP_BTMM btmm;
1388 heim_any any;
1390 any.data = rep.u.encKeyPack.data;
1391 any.length = rep.u.encKeyPack.length;
1393 btmm.dhSignedData = NULL;
1394 btmm.encKeyPack = &any;
1396 ASN1_MALLOC_ENCODE(PA_PK_AS_REP_BTMM, buf, len, &btmm, &size, ret);
1397 } else {
1398 ASN1_MALLOC_ENCODE(PA_PK_AS_REP, buf, len, &rep, &size, ret);
1401 free_PA_PK_AS_REP(&rep);
1402 if (ret) {
1403 krb5_set_error_message(context, ret,
1404 "encode PA-PK-AS-REP failed %d", ret);
1405 goto out;
1407 if (len != size)
1408 krb5_abortx(context, "Internal ASN.1 encoder error");
1410 kdc_log(context, config, 0, "PK-INIT using %s %s", type, other);
1412 } else if (cp->type == PKINIT_WIN2K) {
1413 PA_PK_AS_REP_Win2k rep;
1414 ContentInfo info;
1416 if (cp->keyex != USE_RSA) {
1417 ret = KRB5KRB_ERR_GENERIC;
1418 krb5_set_error_message(context, ret,
1419 "Windows PK-INIT doesn't support DH");
1420 goto out;
1423 memset(&rep, 0, sizeof(rep));
1425 pa_type = KRB5_PADATA_PK_AS_REP_19;
1426 rep.element = choice_PA_PK_AS_REP_Win2k_encKeyPack;
1428 ret = krb5_generate_random_keyblock(context, enctype,
1429 &cp->reply_key);
1430 if (ret) {
1431 free_PA_PK_AS_REP_Win2k(&rep);
1432 goto out;
1434 ret = pk_mk_pa_reply_enckey(context,
1435 config,
1437 req,
1438 req_buffer,
1439 &cp->reply_key,
1440 &info,
1441 &kdc_cert);
1442 if (ret) {
1443 free_PA_PK_AS_REP_Win2k(&rep);
1444 goto out;
1446 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
1447 rep.u.encKeyPack.length, &info, &size,
1448 ret);
1449 free_ContentInfo(&info);
1450 if (ret) {
1451 krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
1452 "failed %d", ret);
1453 free_PA_PK_AS_REP_Win2k(&rep);
1454 goto out;
1456 if (rep.u.encKeyPack.length != size)
1457 krb5_abortx(context, "Internal ASN.1 encoder error");
1459 ASN1_MALLOC_ENCODE(PA_PK_AS_REP_Win2k, buf, len, &rep, &size, ret);
1460 free_PA_PK_AS_REP_Win2k(&rep);
1461 if (ret) {
1462 krb5_set_error_message(context, ret,
1463 "encode PA-PK-AS-REP-Win2k failed %d", ret);
1464 goto out;
1466 if (len != size)
1467 krb5_abortx(context, "Internal ASN.1 encoder error");
1469 ret = krb5_generate_random_keyblock(context, sessionetype,
1470 sessionkey);
1471 if (ret) {
1472 free(buf);
1473 goto out;
1476 } else
1477 krb5_abortx(context, "PK-INIT internal error");
1480 ret = krb5_padata_add(context, md, pa_type, buf, len);
1481 if (ret) {
1482 krb5_set_error_message(context, ret,
1483 "Failed adding PA-PK-AS-REP %d", ret);
1484 free(buf);
1485 goto out;
1488 if (config->pkinit_kdc_ocsp_file) {
1490 if (ocsp.expire == 0 && ocsp.next_update > kdc_time) {
1491 struct stat sb;
1492 int fd;
1494 krb5_data_free(&ocsp.data);
1496 ocsp.expire = 0;
1497 ocsp.next_update = kdc_time + 60 * 5;
1499 fd = open(config->pkinit_kdc_ocsp_file, O_RDONLY);
1500 if (fd < 0) {
1501 kdc_log(context, config, 0,
1502 "PK-INIT failed to open ocsp data file %d", errno);
1503 goto out_ocsp;
1505 ret = fstat(fd, &sb);
1506 if (ret) {
1507 ret = errno;
1508 close(fd);
1509 kdc_log(context, config, 0,
1510 "PK-INIT failed to stat ocsp data %d", ret);
1511 goto out_ocsp;
1514 ret = krb5_data_alloc(&ocsp.data, sb.st_size);
1515 if (ret) {
1516 close(fd);
1517 kdc_log(context, config, 0,
1518 "PK-INIT failed to stat ocsp data %d", ret);
1519 goto out_ocsp;
1521 ocsp.data.length = sb.st_size;
1522 ret = read(fd, ocsp.data.data, sb.st_size);
1523 close(fd);
1524 if (ret != sb.st_size) {
1525 kdc_log(context, config, 0,
1526 "PK-INIT failed to read ocsp data %d", errno);
1527 goto out_ocsp;
1530 ret = hx509_ocsp_verify(context->hx509ctx,
1531 kdc_time,
1532 kdc_cert,
1534 ocsp.data.data, ocsp.data.length,
1535 &ocsp.expire);
1536 if (ret) {
1537 kdc_log(context, config, 0,
1538 "PK-INIT failed to verify ocsp data %d", ret);
1539 krb5_data_free(&ocsp.data);
1540 ocsp.expire = 0;
1541 } else if (ocsp.expire > 180) {
1542 ocsp.expire -= 180; /* refetch the ocsp before it expire */
1543 ocsp.next_update = ocsp.expire;
1544 } else {
1545 ocsp.next_update = kdc_time;
1547 out_ocsp:
1548 ret = 0;
1551 if (ocsp.expire != 0 && ocsp.expire > kdc_time) {
1553 ret = krb5_padata_add(context, md,
1554 KRB5_PADATA_PA_PK_OCSP_RESPONSE,
1555 ocsp.data.data, ocsp.data.length);
1556 if (ret) {
1557 krb5_set_error_message(context, ret,
1558 "Failed adding OCSP response %d", ret);
1559 goto out;
1564 out:
1565 if (kdc_cert)
1566 hx509_cert_free(kdc_cert);
1568 if (ret == 0)
1569 ret = krb5_copy_keyblock_contents(context, &cp->reply_key, reply_key);
1570 return ret;
1573 static int
1574 match_rfc_san(krb5_context context,
1575 krb5_kdc_configuration *config,
1576 hx509_context hx509ctx,
1577 hx509_cert client_cert,
1578 krb5_const_principal match)
1580 hx509_octet_string_list list;
1581 int ret, found = 0;
1582 size_t i;
1584 memset(&list, 0 , sizeof(list));
1586 ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
1587 client_cert,
1588 &asn1_oid_id_pkinit_san,
1589 &list);
1590 if (ret)
1591 goto out;
1593 for (i = 0; !found && i < list.len; i++) {
1594 krb5_principal_data principal;
1595 KRB5PrincipalName kn;
1596 size_t size;
1598 ret = decode_KRB5PrincipalName(list.val[i].data,
1599 list.val[i].length,
1600 &kn, &size);
1601 if (ret) {
1602 const char *msg = krb5_get_error_message(context, ret);
1603 kdc_log(context, config, 0,
1604 "Decoding kerberos name in certificate failed: %s", msg);
1605 krb5_free_error_message(context, msg);
1606 break;
1608 if (size != list.val[i].length) {
1609 kdc_log(context, config, 0,
1610 "Decoding kerberos name have extra bits on the end");
1611 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1614 memset(&principal, 0, sizeof (principal));
1615 principal.name = kn.principalName;
1616 principal.realm = kn.realm;
1618 if (krb5_principal_compare(context, &principal, match) == TRUE)
1619 found = 1;
1620 free_KRB5PrincipalName(&kn);
1623 out:
1624 hx509_free_octet_string_list(&list);
1625 if (ret)
1626 return ret;
1628 if (!found)
1629 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1631 return 0;
1634 static int
1635 match_ms_upn_san(krb5_context context,
1636 krb5_kdc_configuration *config,
1637 hx509_context hx509ctx,
1638 hx509_cert client_cert,
1639 HDB *clientdb,
1640 hdb_entry_ex *client)
1642 hx509_octet_string_list list;
1643 krb5_principal principal = NULL;
1644 int ret;
1645 MS_UPN_SAN upn;
1646 size_t size;
1648 memset(&list, 0 , sizeof(list));
1650 ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
1651 client_cert,
1652 &asn1_oid_id_pkinit_ms_san,
1653 &list);
1654 if (ret)
1655 goto out;
1657 if (list.len != 1) {
1658 kdc_log(context, config, 0,
1659 "More then one PK-INIT MS UPN SAN");
1660 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1661 goto out;
1664 ret = decode_MS_UPN_SAN(list.val[0].data, list.val[0].length, &upn, &size);
1665 if (ret) {
1666 kdc_log(context, config, 0, "Decode of MS-UPN-SAN failed");
1667 goto out;
1669 if (size != list.val[0].length) {
1670 free_MS_UPN_SAN(&upn);
1671 kdc_log(context, config, 0, "Trailing data in ");
1672 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1673 goto out;
1676 kdc_log(context, config, 0, "found MS UPN SAN: %s", upn);
1678 ret = krb5_parse_name(context, upn, &principal);
1679 free_MS_UPN_SAN(&upn);
1680 if (ret) {
1681 kdc_log(context, config, 0, "Failed to parse principal in MS UPN SAN");
1682 goto out;
1685 if (clientdb->hdb_check_pkinit_ms_upn_match) {
1686 ret = clientdb->hdb_check_pkinit_ms_upn_match(context, clientdb, client, principal);
1687 } else {
1690 * This is very wrong, but will do for a fallback
1692 strupr(principal->realm);
1694 if (krb5_principal_compare(context, principal, client->entry.principal) == FALSE)
1695 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1698 out:
1699 if (principal)
1700 krb5_free_principal(context, principal);
1701 hx509_free_octet_string_list(&list);
1703 return ret;
1706 krb5_error_code
1707 _kdc_pk_check_client(krb5_context context,
1708 krb5_kdc_configuration *config,
1709 HDB *clientdb,
1710 hdb_entry_ex *client,
1711 pk_client_params *cp,
1712 char **subject_name)
1714 const HDB_Ext_PKINIT_acl *acl;
1715 const HDB_Ext_PKINIT_cert *pc;
1716 krb5_error_code ret;
1717 hx509_name name;
1718 size_t i;
1720 if (cp->cert == NULL) {
1722 *subject_name = strdup("anonymous client client");
1723 if (*subject_name == NULL)
1724 return ENOMEM;
1725 return 0;
1728 ret = hx509_cert_get_base_subject(context->hx509ctx,
1729 cp->cert,
1730 &name);
1731 if (ret)
1732 return ret;
1734 ret = hx509_name_to_string(name, subject_name);
1735 hx509_name_free(&name);
1736 if (ret)
1737 return ret;
1739 kdc_log(context, config, 0,
1740 "Trying to authorize PK-INIT subject DN %s",
1741 *subject_name);
1743 ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
1744 if (ret == 0 && pc) {
1745 hx509_cert cert;
1746 size_t j;
1748 for (j = 0; j < pc->len; j++) {
1749 cert = hx509_cert_init_data(context->hx509ctx,
1750 pc->val[j].cert.data,
1751 pc->val[j].cert.length,
1752 NULL);
1753 if (cert == NULL)
1754 continue;
1755 ret = hx509_cert_cmp(cert, cp->cert);
1756 hx509_cert_free(cert);
1757 if (ret == 0) {
1758 kdc_log(context, config, 5,
1759 "Found matching PK-INIT cert in hdb");
1760 return 0;
1766 if (config->pkinit_princ_in_cert) {
1767 ret = match_rfc_san(context, config,
1768 context->hx509ctx,
1769 cp->cert,
1770 client->entry.principal);
1771 if (ret == 0) {
1772 kdc_log(context, config, 5,
1773 "Found matching PK-INIT SAN in certificate");
1774 return 0;
1776 ret = match_ms_upn_san(context, config,
1777 context->hx509ctx,
1778 cp->cert,
1779 clientdb,
1780 client);
1781 if (ret == 0) {
1782 kdc_log(context, config, 5,
1783 "Found matching MS UPN SAN in certificate");
1784 return 0;
1788 ret = hdb_entry_get_pkinit_acl(&client->entry, &acl);
1789 if (ret == 0 && acl != NULL) {
1791 * Cheat here and compare the generated name with the string
1792 * and not the reverse.
1794 for (i = 0; i < acl->len; i++) {
1795 if (strcmp(*subject_name, acl->val[0].subject) != 0)
1796 continue;
1798 /* Don't support isser and anchor checking right now */
1799 if (acl->val[0].issuer)
1800 continue;
1801 if (acl->val[0].anchor)
1802 continue;
1804 kdc_log(context, config, 5,
1805 "Found matching PK-INIT database ACL");
1806 return 0;
1810 for (i = 0; i < principal_mappings.len; i++) {
1811 krb5_boolean b;
1813 b = krb5_principal_compare(context,
1814 client->entry.principal,
1815 principal_mappings.val[i].principal);
1816 if (b == FALSE)
1817 continue;
1818 if (strcmp(principal_mappings.val[i].subject, *subject_name) != 0)
1819 continue;
1820 kdc_log(context, config, 5,
1821 "Found matching PK-INIT FILE ACL");
1822 return 0;
1825 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1826 krb5_set_error_message(context, ret,
1827 "PKINIT no matching principals for %s",
1828 *subject_name);
1830 kdc_log(context, config, 5,
1831 "PKINIT no matching principals for %s",
1832 *subject_name);
1834 free(*subject_name);
1835 *subject_name = NULL;
1837 return ret;
1840 static krb5_error_code
1841 add_principal_mapping(krb5_context context,
1842 const char *principal_name,
1843 const char * subject)
1845 struct pk_allowed_princ *tmp;
1846 krb5_principal principal;
1847 krb5_error_code ret;
1849 tmp = realloc(principal_mappings.val,
1850 (principal_mappings.len + 1) * sizeof(*tmp));
1851 if (tmp == NULL)
1852 return ENOMEM;
1853 principal_mappings.val = tmp;
1855 ret = krb5_parse_name(context, principal_name, &principal);
1856 if (ret)
1857 return ret;
1859 principal_mappings.val[principal_mappings.len].principal = principal;
1861 principal_mappings.val[principal_mappings.len].subject = strdup(subject);
1862 if (principal_mappings.val[principal_mappings.len].subject == NULL) {
1863 krb5_free_principal(context, principal);
1864 return ENOMEM;
1866 principal_mappings.len++;
1868 return 0;
1871 krb5_error_code
1872 _kdc_add_inital_verified_cas(krb5_context context,
1873 krb5_kdc_configuration *config,
1874 pk_client_params *cp,
1875 EncTicketPart *tkt)
1877 AD_INITIAL_VERIFIED_CAS cas;
1878 krb5_error_code ret;
1879 krb5_data data;
1880 size_t size = 0;
1882 memset(&cas, 0, sizeof(cas));
1884 /* XXX add CAs to cas here */
1886 ASN1_MALLOC_ENCODE(AD_INITIAL_VERIFIED_CAS, data.data, data.length,
1887 &cas, &size, ret);
1888 if (ret)
1889 return ret;
1890 if (data.length != size)
1891 krb5_abortx(context, "internal asn.1 encoder error");
1893 ret = _kdc_tkt_add_if_relevant_ad(context, tkt,
1894 KRB5_AUTHDATA_INITIAL_VERIFIED_CAS,
1895 &data);
1896 krb5_data_free(&data);
1897 return ret;
1904 static void
1905 load_mappings(krb5_context context, const char *fn)
1907 krb5_error_code ret;
1908 char buf[1024];
1909 unsigned long lineno = 0;
1910 FILE *f;
1912 f = fopen(fn, "r");
1913 if (f == NULL)
1914 return;
1916 while (fgets(buf, sizeof(buf), f) != NULL) {
1917 char *subject_name, *p;
1919 buf[strcspn(buf, "\n")] = '\0';
1920 lineno++;
1922 p = buf + strspn(buf, " \t");
1924 if (*p == '#' || *p == '\0')
1925 continue;
1927 subject_name = strchr(p, ':');
1928 if (subject_name == NULL) {
1929 krb5_warnx(context, "pkinit mapping file line %lu "
1930 "missing \":\" :%s",
1931 lineno, buf);
1932 continue;
1934 *subject_name++ = '\0';
1936 ret = add_principal_mapping(context, p, subject_name);
1937 if (ret) {
1938 krb5_warn(context, ret, "failed to add line %lu \":\" :%s\n",
1939 lineno, buf);
1940 continue;
1944 fclose(f);
1951 krb5_error_code
1952 krb5_kdc_pk_initialize(krb5_context context,
1953 krb5_kdc_configuration *config,
1954 const char *user_id,
1955 const char *anchors,
1956 char **pool,
1957 char **revoke_list)
1959 const char *file;
1960 char *fn = NULL;
1961 krb5_error_code ret;
1963 file = krb5_config_get_string(context, NULL,
1964 "libdefaults", "moduli", NULL);
1966 ret = _krb5_parse_moduli(context, file, &moduli);
1967 if (ret)
1968 krb5_err(context, 1, ret, "PKINIT: failed to load modidi file");
1970 principal_mappings.len = 0;
1971 principal_mappings.val = NULL;
1973 ret = _krb5_pk_load_id(context,
1974 &kdc_identity,
1975 user_id,
1976 anchors,
1977 pool,
1978 revoke_list,
1979 NULL,
1980 NULL,
1981 NULL);
1982 if (ret) {
1983 krb5_warn(context, ret, "PKINIT: ");
1984 config->enable_pkinit = 0;
1985 return ret;
1989 hx509_query *q;
1990 hx509_cert cert;
1992 ret = hx509_query_alloc(context->hx509ctx, &q);
1993 if (ret) {
1994 krb5_warnx(context, "PKINIT: out of memory");
1995 return ENOMEM;
1998 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1999 if (config->pkinit_kdc_friendly_name)
2000 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
2002 ret = hx509_certs_find(context->hx509ctx,
2003 kdc_identity->certs,
2005 &cert);
2006 hx509_query_free(context->hx509ctx, q);
2007 if (ret == 0) {
2008 if (hx509_cert_check_eku(context->hx509ctx, cert,
2009 &asn1_oid_id_pkkdcekuoid, 0)) {
2010 hx509_name name;
2011 char *str;
2012 ret = hx509_cert_get_subject(cert, &name);
2013 if (ret == 0) {
2014 hx509_name_to_string(name, &str);
2015 krb5_warnx(context, "WARNING Found KDC certificate (%s)"
2016 "is missing the PK-INIT KDC EKU, this is bad for "
2017 "interoperability.", str);
2018 hx509_name_free(&name);
2019 free(str);
2022 hx509_cert_free(cert);
2023 } else
2024 krb5_warnx(context, "PKINIT: failed to find a signing "
2025 "certifiate with a public key");
2028 if (krb5_config_get_bool_default(context,
2029 NULL,
2030 FALSE,
2031 "kdc",
2032 "pkinit_allow_proxy_certificate",
2033 NULL))
2034 config->pkinit_allow_proxy_certs = 1;
2036 file = krb5_config_get_string(context,
2037 NULL,
2038 "kdc",
2039 "pkinit_mappings_file",
2040 NULL);
2041 if (file == NULL) {
2042 int aret;
2044 aret = asprintf(&fn, "%s/pki-mapping", hdb_db_dir(context));
2045 if (aret == -1) {
2046 krb5_warnx(context, "PKINIT: out of memory");
2047 return ENOMEM;
2050 file = fn;
2053 load_mappings(context, file);
2054 if (fn)
2055 free(fn);
2057 return 0;
2060 #endif /* PKINIT */