2 * Copyright (c) 2003 - 2008 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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
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
40 #include <heim_asn1.h>
41 #include <rfc2459_asn1.h>
43 #include <pkinit_asn1.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;
65 EncryptionKey reply_key;
68 hx509_certs client_anchors;
69 hx509_verify_ctx verify_ctx;
72 struct pk_principal_mapping {
74 struct pk_allowed_princ {
75 krb5_principal principal;
80 static struct krb5_pk_identity *kdc_identity;
81 static struct pk_principal_mapping principal_mappings;
82 static struct krb5_dh_moduli **moduli;
94 static krb5_error_code
95 pk_check_pkauthenticator_win2k(krb5_context context,
96 PKAuthenticator_Win2k *a,
101 krb5_timeofday (context, &now);
104 if (a->ctime == 0 || abs(a->ctime - now) > context->max_skew) {
105 krb5_clear_error_message(context);
106 return KRB5KRB_AP_ERR_SKEW;
111 static krb5_error_code
112 pk_check_pkauthenticator(krb5_context context,
123 krb5_timeofday (context, &now);
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);
133 krb5_clear_error_message(context);
137 krb5_abortx(context, "Internal error in ASN.1 encoder");
139 ret = krb5_create_checksum(context,
148 krb5_clear_error_message(context);
152 if (a->paChecksum == NULL) {
153 krb5_clear_error_message(context);
154 ret = KRB5_KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED;
158 if (der_heim_octet_string_cmp(a->paChecksum, &checksum.checksum) != 0) {
159 krb5_clear_error_message(context);
160 ret = KRB5KRB_ERR_GENERIC;
164 free_Checksum(&checksum);
170 _kdc_pk_free_client_param(krb5_context context, pk_client_params *cp)
175 hx509_cert_free(cp->cert);
177 hx509_verify_destroy_ctx(cp->verify_ctx);
178 if (cp->keyex == USE_DH) {
180 DH_free(cp->u.dh.key);
181 if (cp->u.dh.public_key)
182 BN_free(cp->u.dh.public_key);
185 if (cp->keyex == USE_ECDH) {
187 EC_KEY_free(cp->u.ecdh.key);
188 if (cp->u.ecdh.public_key)
189 EC_KEY_free(cp->u.ecdh.public_key);
192 krb5_free_keyblock_contents(context, &cp->reply_key);
193 if (cp->dh_group_name)
194 free(cp->dh_group_name);
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));
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;
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");
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");
230 size = DH_size(client_params->u.dh.key);
232 dh_gen_key = malloc(size);
233 if (dh_gen_key == NULL) {
235 krb5_set_error_message(context, ret, "malloc: out of memory");
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");
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);
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");
262 client_params->u.ecdh.key = EC_KEY_new();
263 if (client_params->u.ecdh.key == NULL) {
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) {
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) {
279 krb5_set_error_message(context, ret,
280 N_("malloc: out of memory", ""));
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 */
290 ret = KRB5KRB_ERR_GENERIC;
291 krb5_set_error_message(context, ret,
292 "Diffie-Hellman not selected keys");
296 ret = _krb5_pk_octetstring2key(context,
298 dh_gen_key, dh_gen_keylen,
300 &client_params->reply_key);
305 if (key.keyvalue.data)
306 krb5_free_keyblock_contents(context, &key);
312 integer_to_BN(krb5_context context, const char *field, heim_integer *f)
316 bn = BN_bin2bn((const unsigned char *)f->data, f->length, NULL);
318 krb5_set_error_message(context, KRB5_BADMSGTYPE,
319 "PKINIT: parsing BN failed %s", field);
322 BN_set_negative(bn, f->negative);
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;
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");
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,
358 krb5_set_error_message(context, ret, "Can't decode algorithm "
359 "parameters in clientPublicValue");
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);
367 /* XXX send back proposal of better group */
374 krb5_set_error_message(context, ret, "Cannot create DH structure");
377 ret = KRB5_BADMSGTYPE;
378 dh->p = integer_to_BN(context, "DH prime", &dhparam.p);
381 dh->g = integer_to_BN(context, "DH base", &dhparam.g);
384 dh->q = integer_to_BN(context, "DH p-1 factor", &dhparam.q);
392 ret = decode_DHPublicKey(dh_key_info->subjectPublicKey.data,
393 dh_key_info->subjectPublicKey.length / 8,
397 krb5_clear_error_message(context);
401 client_params->u.dh.public_key = integer_to_BN(context,
404 der_free_heim_integer(&glue);
405 if (client_params->u.dh.public_key == NULL) {
406 ret = KRB5_BADMSGTYPE;
411 client_params->u.dh.key = dh;
418 free_DomainParameters(&dhparam);
424 static krb5_error_code
425 get_ecdh_param(krb5_context context,
426 krb5_kdc_configuration *config,
427 SubjectPublicKeyInfo *dh_key_info,
428 pk_client_params *client_params)
431 EC_KEY *public = NULL;
433 const unsigned char *p;
437 if (dh_key_info->algorithm.parameters == NULL) {
438 krb5_set_error_message(context, KRB5_BADMSGTYPE,
439 "PKINIT missing algorithm parameter "
440 "in clientPublicValue");
441 return KRB5_BADMSGTYPE;
444 memset(&ecp, 0, sizeof(ecp));
446 ret = decode_ECParameters(dh_key_info->algorithm.parameters->data,
447 dh_key_info->algorithm.parameters->length, &ecp, &len);
451 if (ecp.element != choice_ECParameters_namedCurve) {
452 ret = KRB5_BADMSGTYPE;
456 if (der_heim_oid_cmp(&ecp.u.namedCurve, &asn1_oid_id_ec_group_secp256r1) == 0)
457 nid = NID_X9_62_prime256v1;
459 ret = KRB5_BADMSGTYPE;
463 /* XXX verify group is ok */
465 public = EC_KEY_new_by_curve_name(nid);
467 p = dh_key_info->subjectPublicKey.data;
468 len = dh_key_info->subjectPublicKey.length / 8;
469 if (o2i_ECPublicKey(&public, &p, len) == NULL) {
470 ret = KRB5_BADMSGTYPE;
471 krb5_set_error_message(context, ret,
472 "PKINIT failed to decode ECDH key");
475 client_params->u.ecdh.public_key = public;
481 free_ECParameters(&ecp);
485 #endif /* HAVE_OPENSSL */
488 _kdc_pk_rd_padata(krb5_context context,
489 krb5_kdc_configuration *config,
492 hdb_entry_ex *client,
493 pk_client_params **ret_params)
495 pk_client_params *cp;
497 heim_oid eContentType = { 0, NULL }, contentInfoOid = { 0, NULL };
498 krb5_data eContent = { 0, NULL };
499 krb5_data signed_content = { 0, NULL };
500 const char *type = "unknown type";
501 hx509_certs trust_anchors;
503 const HDB_Ext_PKINIT_cert *pc;
507 if (!config->enable_pkinit) {
508 kdc_log(context, config, 0, "PK-INIT request but PK-INIT not enabled");
509 krb5_clear_error_message(context);
513 cp = calloc(1, sizeof(*cp));
515 krb5_clear_error_message(context);
520 ret = hx509_certs_init(context->hx509ctx,
521 "MEMORY:trust-anchors",
522 0, NULL, &trust_anchors);
524 krb5_set_error_message(context, ret, "failed to create trust anchors");
528 ret = hx509_certs_merge(context->hx509ctx, trust_anchors,
529 kdc_identity->anchors);
531 hx509_certs_free(&trust_anchors);
532 krb5_set_error_message(context, ret, "failed to create verify context");
536 /* Add any registered certificates for this client as trust anchors */
537 ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
538 if (ret == 0 && pc != NULL) {
542 for (i = 0; i < pc->len; i++) {
543 ret = hx509_cert_init_data(context->hx509ctx,
544 pc->val[i].cert.data,
545 pc->val[i].cert.length,
549 hx509_certs_add(context->hx509ctx, trust_anchors, cert);
550 hx509_cert_free(cert);
554 ret = hx509_verify_init_ctx(context->hx509ctx, &cp->verify_ctx);
556 hx509_certs_free(&trust_anchors);
557 krb5_set_error_message(context, ret, "failed to create verify context");
561 hx509_verify_set_time(cp->verify_ctx, kdc_time);
562 hx509_verify_attach_anchors(cp->verify_ctx, trust_anchors);
563 hx509_certs_free(&trust_anchors);
565 if (config->pkinit_allow_proxy_certs)
566 hx509_verify_set_proxy_certificate(cp->verify_ctx, 1);
568 if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
569 PA_PK_AS_REQ_Win2k r;
571 type = "PK-INIT-Win2k";
573 if (req->req_body.kdc_options.request_anonymous) {
574 ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
575 krb5_set_error_message(context, ret,
576 "Anon not supported in RSA mode");
580 ret = decode_PA_PK_AS_REQ_Win2k(pa->padata_value.data,
581 pa->padata_value.length,
585 krb5_set_error_message(context, ret, "Can't decode "
586 "PK-AS-REQ-Win2k: %d", ret);
590 ret = hx509_cms_unwrap_ContentInfo(&r.signed_auth_pack,
594 free_PA_PK_AS_REQ_Win2k(&r);
596 krb5_set_error_message(context, ret,
597 "Can't unwrap ContentInfo(win): %d", ret);
601 } else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
604 type = "PK-INIT-IETF";
606 ret = decode_PA_PK_AS_REQ(pa->padata_value.data,
607 pa->padata_value.length,
611 krb5_set_error_message(context, ret,
612 "Can't decode PK-AS-REQ: %d", ret);
616 /* XXX look at r.kdcPkId */
617 if (r.trustedCertifiers) {
618 ExternalPrincipalIdentifiers *edi = r.trustedCertifiers;
619 unsigned int i, maxedi;
621 ret = hx509_certs_init(context->hx509ctx,
622 "MEMORY:client-anchors",
624 &cp->client_anchors);
626 krb5_set_error_message(context, ret,
627 "Can't allocate client anchors: %d",
633 * If the client sent more then 10 EDI, don't bother
634 * looking more then 10 of performance reasons.
639 for (i = 0; i < maxedi; i++) {
640 IssuerAndSerialNumber iasn;
645 if (edi->val[i].issuerAndSerialNumber == NULL)
648 ret = hx509_query_alloc(context->hx509ctx, &q);
650 krb5_set_error_message(context, ret,
651 "Failed to allocate hx509_query");
655 ret = decode_IssuerAndSerialNumber(edi->val[i].issuerAndSerialNumber->data,
656 edi->val[i].issuerAndSerialNumber->length,
660 hx509_query_free(context->hx509ctx, q);
663 ret = hx509_query_match_issuer_serial(q, &iasn.issuer, &iasn.serialNumber);
664 free_IssuerAndSerialNumber(&iasn);
666 hx509_query_free(context->hx509ctx, q);
670 ret = hx509_certs_find(context->hx509ctx,
674 hx509_query_free(context->hx509ctx, q);
677 hx509_certs_add(context->hx509ctx,
678 cp->client_anchors, cert);
679 hx509_cert_free(cert);
683 ret = hx509_cms_unwrap_ContentInfo(&r.signedAuthPack,
687 free_PA_PK_AS_REQ(&r);
689 krb5_set_error_message(context, ret,
690 "Can't unwrap ContentInfo: %d", ret);
695 krb5_clear_error_message(context);
696 ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
700 ret = der_heim_oid_cmp(&contentInfoOid, &asn1_oid_id_pkcs7_signedData);
702 ret = KRB5KRB_ERR_GENERIC;
703 krb5_set_error_message(context, ret,
704 "PK-AS-REQ-Win2k invalid content type oid");
709 ret = KRB5KRB_ERR_GENERIC;
710 krb5_set_error_message(context, ret,
711 "PK-AS-REQ-Win2k no signed auth pack");
716 hx509_certs signer_certs;
717 int flags = HX509_CMS_VS_ALLOW_DATA_OID_MISMATCH; /* BTMM */
719 if (req->req_body.kdc_options.request_anonymous)
720 flags |= HX509_CMS_VS_ALLOW_ZERO_SIGNER;
722 ret = hx509_cms_verify_signed(context->hx509ctx,
726 signed_content.length,
728 kdc_identity->certpool,
733 char *s = hx509_get_error_string(context->hx509ctx, ret);
734 krb5_warnx(context, "PKINIT: failed to verify signature: %s: %d",
741 ret = hx509_get_one_cert(context->hx509ctx, signer_certs,
743 hx509_certs_free(&signer_certs);
749 /* Signature is correct, now verify the signed message */
750 if (der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkcs7_data) != 0 &&
751 der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkauthdata) != 0)
753 ret = KRB5_BADMSGTYPE;
754 krb5_set_error_message(context, ret, "got wrong oid for pkauthdata");
758 if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
761 ret = decode_AuthPack_Win2k(eContent.data,
766 krb5_set_error_message(context, ret,
767 "Can't decode AuthPack: %d", ret);
771 ret = pk_check_pkauthenticator_win2k(context,
775 free_AuthPack_Win2k(&ap);
779 cp->type = PKINIT_WIN2K;
780 cp->nonce = ap.pkAuthenticator.nonce;
782 if (ap.clientPublicValue) {
783 ret = KRB5KRB_ERR_GENERIC;
784 krb5_set_error_message(context, ret,
785 "DH not supported for windows");
788 free_AuthPack_Win2k(&ap);
790 } else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
793 ret = decode_AuthPack(eContent.data,
798 krb5_set_error_message(context, ret,
799 "Can't decode AuthPack: %d", ret);
804 if (req->req_body.kdc_options.request_anonymous &&
805 ap.clientPublicValue == NULL) {
807 ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
808 krb5_set_error_message(context, ret,
809 "Anon not supported in RSA mode");
813 ret = pk_check_pkauthenticator(context,
821 cp->type = PKINIT_27;
822 cp->nonce = ap.pkAuthenticator.nonce;
824 if (ap.clientPublicValue) {
825 if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_dhpublicnumber) == 0) {
827 ret = get_dh_param(context, config,
828 ap.clientPublicValue, cp);
830 } else if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_ecPublicKey) == 0) {
831 cp->keyex = USE_ECDH;
832 ret = get_ecdh_param(context, config,
833 ap.clientPublicValue, cp);
834 #endif /* HAVE_OPENSSL */
836 ret = KRB5_BADMSGTYPE;
837 krb5_set_error_message(context, ret, "PKINIT unknown DH mechanism");
846 ret = hx509_peer_info_alloc(context->hx509ctx,
853 if (ap.supportedCMSTypes) {
854 ret = hx509_peer_info_set_cms_algs(context->hx509ctx,
856 ap.supportedCMSTypes->val,
857 ap.supportedCMSTypes->len);
863 /* assume old client */
864 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
865 hx509_crypto_des_rsdi_ede3_cbc());
866 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
867 hx509_signature_rsa_with_sha1());
868 hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
869 hx509_signature_sha1());
873 krb5_abortx(context, "internal pkinit error");
875 kdc_log(context, config, 0, "PK-INIT request of type %s", type);
879 krb5_warn(context, ret, "PKINIT");
881 if (signed_content.data)
882 free(signed_content.data);
883 krb5_data_free(&eContent);
884 der_free_oid(&eContentType);
885 der_free_oid(&contentInfoOid);
887 _kdc_pk_free_client_param(context, cp);
897 static krb5_error_code
898 BN_to_integer(krb5_context context, BIGNUM *bn, heim_integer *integer)
900 integer->length = BN_num_bytes(bn);
901 integer->data = malloc(integer->length);
902 if (integer->data == NULL) {
903 krb5_clear_error_message(context);
906 BN_bn2bin(bn, integer->data);
907 integer->negative = BN_is_negative(bn);
911 static krb5_error_code
912 pk_mk_pa_reply_enckey(krb5_context context,
913 krb5_kdc_configuration *config,
914 pk_client_params *cp,
916 const krb5_data *req_buffer,
917 krb5_keyblock *reply_key,
918 ContentInfo *content_info,
919 hx509_cert *kdc_cert)
921 const heim_oid *envelopedAlg = NULL, *sdAlg = NULL, *evAlg = NULL;
923 krb5_data buf, signed_data;
927 krb5_data_zero(&buf);
928 krb5_data_zero(&signed_data);
933 * If the message client is a win2k-type but it send pa data
934 * 09-binding it expects a IETF (checksum) reply so there can be
941 if (_kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_09_BINDING) == NULL
942 && config->pkinit_require_binding == 0)
946 sdAlg = &asn1_oid_id_pkcs7_data;
947 evAlg = &asn1_oid_id_pkcs7_data;
948 envelopedAlg = &asn1_oid_id_rsadsi_des_ede3_cbc;
952 sdAlg = &asn1_oid_id_pkrkeydata;
953 evAlg = &asn1_oid_id_pkcs7_signedData;
956 krb5_abortx(context, "internal pkinit error");
960 ReplyKeyPack_Win2k kp;
961 memset(&kp, 0, sizeof(kp));
963 ret = copy_EncryptionKey(reply_key, &kp.replyKey);
965 krb5_clear_error_message(context);
968 kp.nonce = cp->nonce;
970 ASN1_MALLOC_ENCODE(ReplyKeyPack_Win2k,
971 buf.data, buf.length,
973 free_ReplyKeyPack_Win2k(&kp);
975 krb5_crypto ascrypto;
977 memset(&kp, 0, sizeof(kp));
979 ret = copy_EncryptionKey(reply_key, &kp.replyKey);
981 krb5_clear_error_message(context);
985 ret = krb5_crypto_init(context, reply_key, 0, &ascrypto);
987 krb5_clear_error_message(context);
991 ret = krb5_create_checksum(context, ascrypto, 6, 0,
992 req_buffer->data, req_buffer->length,
995 krb5_clear_error_message(context);
999 ret = krb5_crypto_destroy(context, ascrypto);
1001 krb5_clear_error_message(context);
1004 ASN1_MALLOC_ENCODE(ReplyKeyPack, buf.data, buf.length, &kp, &size,ret);
1005 free_ReplyKeyPack(&kp);
1008 krb5_set_error_message(context, ret, "ASN.1 encoding of ReplyKeyPack "
1009 "failed (%d)", ret);
1012 if (buf.length != size)
1013 krb5_abortx(context, "Internal ASN.1 encoder error");
1019 ret = hx509_query_alloc(context->hx509ctx, &q);
1023 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1024 if (config->pkinit_kdc_friendly_name)
1025 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
1027 ret = hx509_certs_find(context->hx509ctx,
1028 kdc_identity->certs,
1031 hx509_query_free(context->hx509ctx, q);
1035 ret = hx509_cms_create_signed_1(context->hx509ctx,
1044 kdc_identity->certpool,
1049 krb5_data_free(&buf);
1053 if (cp->type == PKINIT_WIN2K) {
1054 ret = hx509_cms_wrap_ContentInfo(&asn1_oid_id_pkcs7_signedData,
1059 krb5_data_free(&signed_data);
1063 ret = hx509_cms_envelope_1(context->hx509ctx,
1064 HX509_CMS_EV_NO_KU_CHECK,
1066 signed_data.data, signed_data.length,
1072 ret = _krb5_pk_mk_ContentInfo(context,
1074 &asn1_oid_id_pkcs7_envelopedData,
1077 if (ret && *kdc_cert) {
1078 hx509_cert_free(*kdc_cert);
1082 krb5_data_free(&buf);
1083 krb5_data_free(&signed_data);
1091 static krb5_error_code
1092 pk_mk_pa_reply_dh(krb5_context context,
1093 krb5_kdc_configuration *config,
1094 pk_client_params *cp,
1095 ContentInfo *content_info,
1096 hx509_cert *kdc_cert)
1098 KDCDHKeyInfo dh_info;
1099 krb5_data signed_data, buf;
1100 ContentInfo contentinfo;
1101 krb5_error_code ret;
1106 memset(&contentinfo, 0, sizeof(contentinfo));
1107 memset(&dh_info, 0, sizeof(dh_info));
1108 krb5_data_zero(&signed_data);
1109 krb5_data_zero(&buf);
1113 if (cp->keyex == USE_DH) {
1114 DH *kdc_dh = cp->u.dh.key;
1117 ret = BN_to_integer(context, kdc_dh->pub_key, &i);
1121 ASN1_MALLOC_ENCODE(DHPublicKey, buf.data, buf.length, &i, &size, ret);
1122 der_free_heim_integer(&i);
1124 krb5_set_error_message(context, ret, "ASN.1 encoding of "
1125 "DHPublicKey failed (%d)", ret);
1128 if (buf.length != size)
1129 krb5_abortx(context, "Internal ASN.1 encoder error");
1131 dh_info.subjectPublicKey.length = buf.length * 8;
1132 dh_info.subjectPublicKey.data = buf.data;
1133 krb5_data_zero(&buf);
1135 } else if (cp->keyex == USE_ECDH) {
1139 len = i2o_ECPublicKey(cp->u.ecdh.key, NULL);
1147 dh_info.subjectPublicKey.length = len * 8;
1148 dh_info.subjectPublicKey.data = p;
1150 len = i2o_ECPublicKey(cp->u.ecdh.key, &p);
1155 krb5_abortx(context, "no keyex selected ?");
1158 dh_info.nonce = cp->nonce;
1160 ASN1_MALLOC_ENCODE(KDCDHKeyInfo, buf.data, buf.length, &dh_info, &size,
1163 krb5_set_error_message(context, ret, "ASN.1 encoding of "
1164 "KdcDHKeyInfo failed (%d)", ret);
1167 if (buf.length != size)
1168 krb5_abortx(context, "Internal ASN.1 encoder error");
1171 * Create the SignedData structure and sign the KdcDHKeyInfo
1175 ret = hx509_query_alloc(context->hx509ctx, &q);
1179 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1180 if (config->pkinit_kdc_friendly_name)
1181 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
1183 ret = hx509_certs_find(context->hx509ctx,
1184 kdc_identity->certs,
1187 hx509_query_free(context->hx509ctx, q);
1191 ret = hx509_cms_create_signed_1(context->hx509ctx,
1193 &asn1_oid_id_pkdhkeydata,
1200 kdc_identity->certpool,
1203 kdc_log(context, config, 0, "Failed signing the DH* reply: %d", ret);
1208 ret = _krb5_pk_mk_ContentInfo(context,
1210 &asn1_oid_id_pkcs7_signedData,
1216 if (ret && *kdc_cert) {
1217 hx509_cert_free(*kdc_cert);
1221 krb5_data_free(&buf);
1222 krb5_data_free(&signed_data);
1223 free_KDCDHKeyInfo(&dh_info);
1233 _kdc_pk_mk_pa_reply(krb5_context context,
1234 krb5_kdc_configuration *config,
1235 pk_client_params *cp,
1236 const hdb_entry_ex *client,
1237 krb5_enctype sessionetype,
1239 const krb5_data *req_buffer,
1240 krb5_keyblock **reply_key,
1241 krb5_keyblock *sessionkey,
1244 krb5_error_code ret;
1246 size_t len = 0, size = 0;
1247 krb5_enctype enctype;
1249 hx509_cert kdc_cert = NULL;
1252 if (!config->enable_pkinit) {
1253 krb5_clear_error_message(context);
1257 if (req->req_body.etype.len > 0) {
1258 for (i = 0; i < req->req_body.etype.len; i++)
1259 if (krb5_enctype_valid(context, req->req_body.etype.val[i]) == 0)
1261 if (req->req_body.etype.len <= i) {
1262 ret = KRB5KRB_ERR_GENERIC;
1263 krb5_set_error_message(context, ret,
1264 "No valid enctype available from client");
1267 enctype = req->req_body.etype.val[i];
1269 enctype = ETYPE_DES3_CBC_SHA1;
1271 if (cp->type == PKINIT_27) {
1273 const char *type, *other = "";
1275 memset(&rep, 0, sizeof(rep));
1277 pa_type = KRB5_PADATA_PK_AS_REP;
1279 if (cp->keyex == USE_RSA) {
1284 rep.element = choice_PA_PK_AS_REP_encKeyPack;
1286 ret = krb5_generate_random_keyblock(context, enctype,
1289 free_PA_PK_AS_REP(&rep);
1292 ret = pk_mk_pa_reply_enckey(context,
1301 free_PA_PK_AS_REP(&rep);
1304 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
1305 rep.u.encKeyPack.length, &info, &size,
1307 free_ContentInfo(&info);
1309 krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
1311 free_PA_PK_AS_REP(&rep);
1314 if (rep.u.encKeyPack.length != size)
1315 krb5_abortx(context, "Internal ASN.1 encoder error");
1317 ret = krb5_generate_random_keyblock(context, sessionetype,
1320 free_PA_PK_AS_REP(&rep);
1327 switch (cp->keyex) {
1328 case USE_DH: type = "dh"; break;
1330 case USE_ECDH: type = "ecdh"; break;
1332 default: krb5_abortx(context, "unknown keyex"); break;
1335 if (cp->dh_group_name)
1336 other = cp->dh_group_name;
1338 rep.element = choice_PA_PK_AS_REP_dhInfo;
1340 ret = generate_dh_keyblock(context, cp, enctype);
1344 ret = pk_mk_pa_reply_dh(context, config,
1349 free_PA_PK_AS_REP(&rep);
1350 krb5_set_error_message(context, ret,
1351 "create pa-reply-dh "
1356 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.dhInfo.dhSignedData.data,
1357 rep.u.dhInfo.dhSignedData.length, &info, &size,
1359 free_ContentInfo(&info);
1361 krb5_set_error_message(context, ret,
1362 "encoding of Key ContentInfo "
1364 free_PA_PK_AS_REP(&rep);
1367 if (rep.u.encKeyPack.length != size)
1368 krb5_abortx(context, "Internal ASN.1 encoder error");
1370 /* XXX KRB-FX-CF2 */
1371 ret = krb5_generate_random_keyblock(context, sessionetype,
1374 free_PA_PK_AS_REP(&rep);
1378 /* XXX Add PA-PKINIT-KX */
1382 #define use_btmm_with_enckey 0
1383 if (use_btmm_with_enckey && rep.element == choice_PA_PK_AS_REP_encKeyPack) {
1384 PA_PK_AS_REP_BTMM btmm;
1387 any.data = rep.u.encKeyPack.data;
1388 any.length = rep.u.encKeyPack.length;
1390 btmm.dhSignedData = NULL;
1391 btmm.encKeyPack = &any;
1393 ASN1_MALLOC_ENCODE(PA_PK_AS_REP_BTMM, buf, len, &btmm, &size, ret);
1395 ASN1_MALLOC_ENCODE(PA_PK_AS_REP, buf, len, &rep, &size, ret);
1398 free_PA_PK_AS_REP(&rep);
1400 krb5_set_error_message(context, ret,
1401 "encode PA-PK-AS-REP failed %d", ret);
1405 krb5_abortx(context, "Internal ASN.1 encoder error");
1407 kdc_log(context, config, 0, "PK-INIT using %s %s", type, other);
1409 } else if (cp->type == PKINIT_WIN2K) {
1410 PA_PK_AS_REP_Win2k rep;
1413 if (cp->keyex != USE_RSA) {
1414 ret = KRB5KRB_ERR_GENERIC;
1415 krb5_set_error_message(context, ret,
1416 "Windows PK-INIT doesn't support DH");
1420 memset(&rep, 0, sizeof(rep));
1422 pa_type = KRB5_PADATA_PK_AS_REP_19;
1423 rep.element = choice_PA_PK_AS_REP_Win2k_encKeyPack;
1425 ret = krb5_generate_random_keyblock(context, enctype,
1428 free_PA_PK_AS_REP_Win2k(&rep);
1431 ret = pk_mk_pa_reply_enckey(context,
1440 free_PA_PK_AS_REP_Win2k(&rep);
1443 ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
1444 rep.u.encKeyPack.length, &info, &size,
1446 free_ContentInfo(&info);
1448 krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
1450 free_PA_PK_AS_REP_Win2k(&rep);
1453 if (rep.u.encKeyPack.length != size)
1454 krb5_abortx(context, "Internal ASN.1 encoder error");
1456 ASN1_MALLOC_ENCODE(PA_PK_AS_REP_Win2k, buf, len, &rep, &size, ret);
1457 free_PA_PK_AS_REP_Win2k(&rep);
1459 krb5_set_error_message(context, ret,
1460 "encode PA-PK-AS-REP-Win2k failed %d", ret);
1464 krb5_abortx(context, "Internal ASN.1 encoder error");
1466 ret = krb5_generate_random_keyblock(context, sessionetype,
1474 krb5_abortx(context, "PK-INIT internal error");
1477 ret = krb5_padata_add(context, md, pa_type, buf, len);
1479 krb5_set_error_message(context, ret,
1480 "Failed adding PA-PK-AS-REP %d", ret);
1485 if (config->pkinit_kdc_ocsp_file) {
1487 if (ocsp.expire == 0 && ocsp.next_update > kdc_time) {
1491 krb5_data_free(&ocsp.data);
1494 ocsp.next_update = kdc_time + 60 * 5;
1496 fd = open(config->pkinit_kdc_ocsp_file, O_RDONLY);
1498 kdc_log(context, config, 0,
1499 "PK-INIT failed to open ocsp data file %d", errno);
1502 ret = fstat(fd, &sb);
1506 kdc_log(context, config, 0,
1507 "PK-INIT failed to stat ocsp data %d", ret);
1511 ret = krb5_data_alloc(&ocsp.data, sb.st_size);
1514 kdc_log(context, config, 0,
1515 "PK-INIT failed to stat ocsp data %d", ret);
1518 ocsp.data.length = sb.st_size;
1519 ret = read(fd, ocsp.data.data, sb.st_size);
1521 if (ret != sb.st_size) {
1522 kdc_log(context, config, 0,
1523 "PK-INIT failed to read ocsp data %d", errno);
1527 ret = hx509_ocsp_verify(context->hx509ctx,
1531 ocsp.data.data, ocsp.data.length,
1534 kdc_log(context, config, 0,
1535 "PK-INIT failed to verify ocsp data %d", ret);
1536 krb5_data_free(&ocsp.data);
1538 } else if (ocsp.expire > 180) {
1539 ocsp.expire -= 180; /* refetch the ocsp before it expire */
1540 ocsp.next_update = ocsp.expire;
1542 ocsp.next_update = kdc_time;
1548 if (ocsp.expire != 0 && ocsp.expire > kdc_time) {
1550 ret = krb5_padata_add(context, md,
1551 KRB5_PADATA_PA_PK_OCSP_RESPONSE,
1552 ocsp.data.data, ocsp.data.length);
1554 krb5_set_error_message(context, ret,
1555 "Failed adding OCSP response %d", ret);
1563 hx509_cert_free(kdc_cert);
1566 *reply_key = &cp->reply_key;
1571 match_rfc_san(krb5_context context,
1572 krb5_kdc_configuration *config,
1573 hx509_context hx509ctx,
1574 hx509_cert client_cert,
1575 krb5_const_principal match)
1577 hx509_octet_string_list list;
1581 memset(&list, 0 , sizeof(list));
1583 ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
1585 &asn1_oid_id_pkinit_san,
1590 for (i = 0; !found && i < list.len; i++) {
1591 krb5_principal_data principal;
1592 KRB5PrincipalName kn;
1595 ret = decode_KRB5PrincipalName(list.val[i].data,
1599 const char *msg = krb5_get_error_message(context, ret);
1600 kdc_log(context, config, 0,
1601 "Decoding kerberos name in certificate failed: %s", msg);
1602 krb5_free_error_message(context, msg);
1605 if (size != list.val[i].length) {
1606 kdc_log(context, config, 0,
1607 "Decoding kerberos name have extra bits on the end");
1608 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1611 principal.name = kn.principalName;
1612 principal.realm = kn.realm;
1614 if (krb5_principal_compare(context, &principal, match) == TRUE)
1616 free_KRB5PrincipalName(&kn);
1620 hx509_free_octet_string_list(&list);
1625 return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1631 match_ms_upn_san(krb5_context context,
1632 krb5_kdc_configuration *config,
1633 hx509_context hx509ctx,
1634 hx509_cert client_cert,
1636 hdb_entry_ex *client)
1638 hx509_octet_string_list list;
1639 krb5_principal principal = NULL;
1644 memset(&list, 0 , sizeof(list));
1646 ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
1648 &asn1_oid_id_pkinit_ms_san,
1653 if (list.len != 1) {
1654 kdc_log(context, config, 0,
1655 "More then one PK-INIT MS UPN SAN");
1659 ret = decode_MS_UPN_SAN(list.val[0].data, list.val[0].length, &upn, &size);
1661 kdc_log(context, config, 0, "Decode of MS-UPN-SAN failed");
1664 if (size != list.val[0].length) {
1665 free_MS_UPN_SAN(&upn);
1666 kdc_log(context, config, 0, "Trailing data in ");
1667 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1671 kdc_log(context, config, 0, "found MS UPN SAN: %s", upn);
1673 ret = krb5_parse_name(context, upn, &principal);
1674 free_MS_UPN_SAN(&upn);
1676 kdc_log(context, config, 0, "Failed to parse principal in MS UPN SAN");
1680 if (clientdb->hdb_check_pkinit_ms_upn_match) {
1681 ret = clientdb->hdb_check_pkinit_ms_upn_match(context, clientdb, client, principal);
1685 * This is very wrong, but will do for a fallback
1687 strupr(principal->realm);
1689 if (krb5_principal_compare(context, principal, client->entry.principal) == FALSE)
1690 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1695 krb5_free_principal(context, principal);
1696 hx509_free_octet_string_list(&list);
1702 _kdc_pk_check_client(krb5_context context,
1703 krb5_kdc_configuration *config,
1705 hdb_entry_ex *client,
1706 pk_client_params *cp,
1707 char **subject_name)
1709 const HDB_Ext_PKINIT_acl *acl;
1710 const HDB_Ext_PKINIT_cert *pc;
1711 krb5_error_code ret;
1715 if (cp->cert == NULL) {
1717 *subject_name = strdup("anonymous client client");
1718 if (*subject_name == NULL)
1723 ret = hx509_cert_get_base_subject(context->hx509ctx,
1729 ret = hx509_name_to_string(name, subject_name);
1730 hx509_name_free(&name);
1734 kdc_log(context, config, 0,
1735 "Trying to authorize PK-INIT subject DN %s",
1738 ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
1739 if (ret == 0 && pc) {
1743 for (j = 0; j < pc->len; j++) {
1744 ret = hx509_cert_init_data(context->hx509ctx,
1745 pc->val[j].cert.data,
1746 pc->val[j].cert.length,
1750 ret = hx509_cert_cmp(cert, cp->cert);
1751 hx509_cert_free(cert);
1753 kdc_log(context, config, 5,
1754 "Found matching PK-INIT cert in hdb");
1761 if (config->pkinit_princ_in_cert) {
1762 ret = match_rfc_san(context, config,
1765 client->entry.principal);
1767 kdc_log(context, config, 5,
1768 "Found matching PK-INIT SAN in certificate");
1771 ret = match_ms_upn_san(context, config,
1777 kdc_log(context, config, 5,
1778 "Found matching MS UPN SAN in certificate");
1783 ret = hdb_entry_get_pkinit_acl(&client->entry, &acl);
1784 if (ret == 0 && acl != NULL) {
1786 * Cheat here and compare the generated name with the string
1787 * and not the reverse.
1789 for (i = 0; i < acl->len; i++) {
1790 if (strcmp(*subject_name, acl->val[0].subject) != 0)
1793 /* Don't support isser and anchor checking right now */
1794 if (acl->val[0].issuer)
1796 if (acl->val[0].anchor)
1799 kdc_log(context, config, 5,
1800 "Found matching PK-INIT database ACL");
1805 for (i = 0; i < principal_mappings.len; i++) {
1808 b = krb5_principal_compare(context,
1809 client->entry.principal,
1810 principal_mappings.val[i].principal);
1813 if (strcmp(principal_mappings.val[i].subject, *subject_name) != 0)
1815 kdc_log(context, config, 5,
1816 "Found matching PK-INIT FILE ACL");
1820 ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
1821 krb5_set_error_message(context, ret,
1822 "PKINIT no matching principals for %s",
1825 kdc_log(context, config, 5,
1826 "PKINIT no matching principals for %s",
1829 free(*subject_name);
1830 *subject_name = NULL;
1835 static krb5_error_code
1836 add_principal_mapping(krb5_context context,
1837 const char *principal_name,
1838 const char * subject)
1840 struct pk_allowed_princ *tmp;
1841 krb5_principal principal;
1842 krb5_error_code ret;
1844 tmp = realloc(principal_mappings.val,
1845 (principal_mappings.len + 1) * sizeof(*tmp));
1848 principal_mappings.val = tmp;
1850 ret = krb5_parse_name(context, principal_name, &principal);
1854 principal_mappings.val[principal_mappings.len].principal = principal;
1856 principal_mappings.val[principal_mappings.len].subject = strdup(subject);
1857 if (principal_mappings.val[principal_mappings.len].subject == NULL) {
1858 krb5_free_principal(context, principal);
1861 principal_mappings.len++;
1867 _kdc_add_inital_verified_cas(krb5_context context,
1868 krb5_kdc_configuration *config,
1869 pk_client_params *cp,
1872 AD_INITIAL_VERIFIED_CAS cas;
1873 krb5_error_code ret;
1877 memset(&cas, 0, sizeof(cas));
1879 /* XXX add CAs to cas here */
1881 ASN1_MALLOC_ENCODE(AD_INITIAL_VERIFIED_CAS, data.data, data.length,
1885 if (data.length != size)
1886 krb5_abortx(context, "internal asn.1 encoder error");
1888 ret = _kdc_tkt_add_if_relevant_ad(context, tkt,
1889 KRB5_AUTHDATA_INITIAL_VERIFIED_CAS,
1891 krb5_data_free(&data);
1900 load_mappings(krb5_context context, const char *fn)
1902 krb5_error_code ret;
1904 unsigned long lineno = 0;
1911 while (fgets(buf, sizeof(buf), f) != NULL) {
1912 char *subject_name, *p;
1914 buf[strcspn(buf, "\n")] = '\0';
1917 p = buf + strspn(buf, " \t");
1919 if (*p == '#' || *p == '\0')
1922 subject_name = strchr(p, ':');
1923 if (subject_name == NULL) {
1924 krb5_warnx(context, "pkinit mapping file line %lu "
1925 "missing \":\" :%s",
1929 *subject_name++ = '\0';
1931 ret = add_principal_mapping(context, p, subject_name);
1933 krb5_warn(context, ret, "failed to add line %lu \":\" :%s\n",
1947 krb5_kdc_pk_initialize(krb5_context context,
1948 krb5_kdc_configuration *config,
1949 const char *user_id,
1950 const char *anchors,
1956 krb5_error_code ret;
1958 file = krb5_config_get_string(context, NULL,
1959 "libdefaults", "moduli", NULL);
1961 ret = _krb5_parse_moduli(context, file, &moduli);
1963 krb5_err(context, 1, ret, "PKINIT: failed to load modidi file");
1965 principal_mappings.len = 0;
1966 principal_mappings.val = NULL;
1968 ret = _krb5_pk_load_id(context,
1978 krb5_warn(context, ret, "PKINIT: ");
1979 config->enable_pkinit = 0;
1987 ret = hx509_query_alloc(context->hx509ctx, &q);
1989 krb5_warnx(context, "PKINIT: out of memory");
1993 hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
1994 if (config->pkinit_kdc_friendly_name)
1995 hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
1997 ret = hx509_certs_find(context->hx509ctx,
1998 kdc_identity->certs,
2001 hx509_query_free(context->hx509ctx, q);
2003 if (hx509_cert_check_eku(context->hx509ctx, cert,
2004 &asn1_oid_id_pkkdcekuoid, 0)) {
2007 ret = hx509_cert_get_subject(cert, &name);
2009 hx509_name_to_string(name, &str);
2010 krb5_warnx(context, "WARNING Found KDC certificate (%s)"
2011 "is missing the PK-INIT KDC EKU, this is bad for "
2012 "interoperability.", str);
2013 hx509_name_free(&name);
2017 hx509_cert_free(cert);
2019 krb5_warnx(context, "PKINIT: failed to find a signing "
2020 "certifiate with a public key");
2023 if (krb5_config_get_bool_default(context,
2027 "pkinit_allow_proxy_certificate",
2029 config->pkinit_allow_proxy_certs = 1;
2031 file = krb5_config_get_string(context,
2034 "pkinit_mappings_file",
2037 asprintf(&fn, "%s/pki-mapping", hdb_db_dir(context));
2041 load_mappings(context, file);