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/*
* Copyright (C) 2014 Martin Willi
* Copyright (C) 2014 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#define _GNU_SOURCE
#include <library.h>
#include "acert_validator.h"
#include <credentials/certificates/x509.h>
#include <credentials/certificates/ac.h>
typedef struct private_acert_validator_t private_acert_validator_t;
/**
* Private data of an acert_validator_t object.
*/
struct private_acert_validator_t {
/**
* Public acert_validator_t interface.
*/
acert_validator_t public;
};
/**
* Check if an AC can be trusted
*/
static bool verify(private_acert_validator_t *this, certificate_t *ac)
{
certificate_t *issuer;
enumerator_t *enumerator;
bool verified = FALSE;
if (!ac->get_validity(ac, NULL, NULL, NULL))
{
return FALSE;
}
DBG1(DBG_CFG, "verifying attribute certificate issued by \"%Y\"",
ac->get_issuer(ac));
enumerator = lib->credmgr->create_trusted_enumerator(lib->credmgr, KEY_ANY,
ac->get_issuer(ac), TRUE);
while (enumerator->enumerate(enumerator, &issuer, NULL))
{
if (issuer->get_validity(issuer, NULL, NULL, NULL))
{
if (lib->credmgr->issued_by(lib->credmgr, ac, issuer, NULL))
{
verified = TRUE;
break;
}
}
}
enumerator->destroy(enumerator);
return verified;
}
/**
* Apply AC group membership to auth config
*/
static void apply(private_acert_validator_t *this, ac_t *ac, auth_cfg_t *auth)
{
enumerator_t *enumerator;
ac_group_type_t type;
chunk_t chunk;
enumerator = ac->create_group_enumerator(ac);
while (enumerator->enumerate(enumerator, &type, &chunk))
{
if (type == AC_GROUP_TYPE_STRING)
{
auth->add(auth, AUTH_RULE_GROUP,
identification_create_from_data(chunk));
}
}
enumerator->destroy(enumerator);
}
METHOD(cert_validator_t, validate, bool,
private_acert_validator_t *this, certificate_t *subject,
certificate_t *issuer, bool online, u_int pathlen, bool anchor,
auth_cfg_t *auth)
{
/* for X.509 end entity certs only */
if (pathlen == 0 && subject->get_type(subject) == CERT_X509)
{
x509_t *x509 = (x509_t*)subject;
enumerator_t *enumerator;
identification_t *id, *serial;
ac_t *ac;
/* find attribute certificates by serial and issuer. A lookup by
* the holder DN would work as well, but RFC 5755 recommends the use
* of baseCertificateID. */
serial = identification_create_from_encoding(ID_KEY_ID,
x509->get_serial(x509));
enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
CERT_X509_AC, KEY_ANY, serial, FALSE);
while (enumerator->enumerate(enumerator, &ac))
{
id = ac->get_holderIssuer(ac);
if (id && id->equals(id, subject->get_issuer(subject)))
{
if (verify(this, &ac->certificate))
{
apply(this, ac, auth);
}
}
}
enumerator->destroy(enumerator);
serial->destroy(serial);
}
return TRUE;
}
METHOD(acert_validator_t, destroy, void,
private_acert_validator_t *this)
{
free(this);
}
/**
* See header
*/
acert_validator_t *acert_validator_create()
{
private_acert_validator_t *this;
INIT(this,
.public = {
.validator.validate = _validate,
.destroy = _destroy,
},
);
return &this->public;
}
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