Annotation of embedaddon/strongswan/src/libstrongswan/plugins/acert/acert_validator.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (C) 2014 Martin Willi
3: * Copyright (C) 2014 revosec AG
4: *
5: * This program is free software; you can redistribute it and/or modify it
6: * under the terms of the GNU General Public License as published by the
7: * Free Software Foundation; either version 2 of the License, or (at your
8: * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9: *
10: * This program is distributed in the hope that it will be useful, but
11: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13: * for more details.
14: */
15:
16: #define _GNU_SOURCE
17: #include <library.h>
18:
19: #include "acert_validator.h"
20:
21: #include <credentials/certificates/x509.h>
22: #include <credentials/certificates/ac.h>
23:
24: typedef struct private_acert_validator_t private_acert_validator_t;
25:
26: /**
27: * Private data of an acert_validator_t object.
28: */
29: struct private_acert_validator_t {
30:
31: /**
32: * Public acert_validator_t interface.
33: */
34: acert_validator_t public;
35: };
36:
37: /**
38: * Check if an AC can be trusted
39: */
40: static bool verify(private_acert_validator_t *this, certificate_t *ac)
41: {
42: certificate_t *issuer;
43: enumerator_t *enumerator;
44: bool verified = FALSE;
45:
46: if (!ac->get_validity(ac, NULL, NULL, NULL))
47: {
48: return FALSE;
49: }
50: DBG1(DBG_CFG, "verifying attribute certificate issued by \"%Y\"",
51: ac->get_issuer(ac));
52: enumerator = lib->credmgr->create_trusted_enumerator(lib->credmgr, KEY_ANY,
53: ac->get_issuer(ac), TRUE);
54: while (enumerator->enumerate(enumerator, &issuer, NULL))
55: {
56: if (issuer->get_validity(issuer, NULL, NULL, NULL))
57: {
58: if (lib->credmgr->issued_by(lib->credmgr, ac, issuer, NULL))
59: {
60: verified = TRUE;
61: break;
62: }
63: }
64: }
65: enumerator->destroy(enumerator);
66:
67: return verified;
68: }
69:
70: /**
71: * Apply AC group membership to auth config
72: */
73: static void apply(private_acert_validator_t *this, ac_t *ac, auth_cfg_t *auth)
74: {
75: enumerator_t *enumerator;
76: ac_group_type_t type;
77: chunk_t chunk;
78:
79: enumerator = ac->create_group_enumerator(ac);
80: while (enumerator->enumerate(enumerator, &type, &chunk))
81: {
82: if (type == AC_GROUP_TYPE_STRING)
83: {
84: auth->add(auth, AUTH_RULE_GROUP,
85: identification_create_from_data(chunk));
86: }
87: }
88: enumerator->destroy(enumerator);
89: }
90:
91: METHOD(cert_validator_t, validate, bool,
92: private_acert_validator_t *this, certificate_t *subject,
93: certificate_t *issuer, bool online, u_int pathlen, bool anchor,
94: auth_cfg_t *auth)
95: {
96: /* for X.509 end entity certs only */
97: if (pathlen == 0 && subject->get_type(subject) == CERT_X509)
98: {
99: x509_t *x509 = (x509_t*)subject;
100: enumerator_t *enumerator;
101: identification_t *id, *serial;
102: ac_t *ac;
103:
104: /* find attribute certificates by serial and issuer. A lookup by
105: * the holder DN would work as well, but RFC 5755 recommends the use
106: * of baseCertificateID. */
107: serial = identification_create_from_encoding(ID_KEY_ID,
108: x509->get_serial(x509));
109: enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
110: CERT_X509_AC, KEY_ANY, serial, FALSE);
111: while (enumerator->enumerate(enumerator, &ac))
112: {
113: id = ac->get_holderIssuer(ac);
114: if (id && id->equals(id, subject->get_issuer(subject)))
115: {
116: if (verify(this, &ac->certificate))
117: {
118: apply(this, ac, auth);
119: }
120: }
121: }
122: enumerator->destroy(enumerator);
123: serial->destroy(serial);
124: }
125: return TRUE;
126: }
127:
128: METHOD(acert_validator_t, destroy, void,
129: private_acert_validator_t *this)
130: {
131: free(this);
132: }
133:
134: /**
135: * See header
136: */
137: acert_validator_t *acert_validator_create()
138: {
139: private_acert_validator_t *this;
140:
141: INIT(this,
142: .public = {
143: .validator.validate = _validate,
144: .destroy = _destroy,
145: },
146: );
147:
148: return &this->public;
149: }
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