Martin Willi
5ac0e66879
This validator checks for any attribute certificate it can find for validated end entity certificates and tries to extract group membership information used for connection authorization rules.
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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* Copyright (C) 2014 Martin Willi
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* Copyright (C) 2014 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#define _GNU_SOURCE
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#include <library.h>
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#include "acert_validator.h"
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#include <credentials/certificates/x509.h>
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#include <credentials/certificates/ac.h>
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typedef struct private_acert_validator_t private_acert_validator_t;
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/**
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* Private data of an acert_validator_t object.
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*/
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struct private_acert_validator_t {
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/**
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* Public acert_validator_t interface.
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*/
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acert_validator_t public;
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};
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/**
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* Check if an AC can be trusted
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*/
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static bool verify(private_acert_validator_t *this, certificate_t *ac)
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{
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certificate_t *issuer;
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enumerator_t *enumerator;
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bool verified = FALSE;
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if (!ac->get_validity(ac, NULL, NULL, NULL))
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{
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return FALSE;
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}
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DBG1(DBG_CFG, "verifying attribute certificate issued by \"%Y\"",
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ac->get_issuer(ac));
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enumerator = lib->credmgr->create_trusted_enumerator(lib->credmgr, KEY_ANY,
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ac->get_issuer(ac), TRUE);
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while (enumerator->enumerate(enumerator, &issuer, NULL))
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{
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if (issuer->get_validity(issuer, NULL, NULL, NULL))
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{
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if (lib->credmgr->issued_by(lib->credmgr, ac, issuer, NULL))
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{
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verified = TRUE;
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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return verified;
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}
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/**
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* Apply AC group membership to auth config
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*/
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static void apply(private_acert_validator_t *this, ac_t *ac, auth_cfg_t *auth)
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{
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enumerator_t *enumerator;
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ac_group_type_t type;
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chunk_t chunk;
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enumerator = ac->create_group_enumerator(ac);
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while (enumerator->enumerate(enumerator, &type, &chunk))
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{
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if (type == AC_GROUP_TYPE_STRING)
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{
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auth->add(auth, AUTH_RULE_GROUP,
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identification_create_from_data(chunk));
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}
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}
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enumerator->destroy(enumerator);
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}
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METHOD(cert_validator_t, validate, bool,
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private_acert_validator_t *this, certificate_t *subject,
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certificate_t *issuer, bool online, u_int pathlen, bool anchor,
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auth_cfg_t *auth)
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{
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/* for X.509 end entity certs only */
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if (pathlen == 0 && subject->get_type(subject) == CERT_X509)
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{
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x509_t *x509 = (x509_t*)subject;
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enumerator_t *enumerator;
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identification_t *id, *serial;
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ac_t *ac;
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/* find attribute certificates by serial and issuer. A lookup by
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* the holder DN would work as well, but RFC 5755 recommends the use
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* of baseCertificateID. */
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serial = identification_create_from_encoding(ID_KEY_ID,
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x509->get_serial(x509));
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enumerator = lib->credmgr->create_cert_enumerator(lib->credmgr,
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CERT_X509_AC, KEY_ANY, serial, FALSE);
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while (enumerator->enumerate(enumerator, &ac))
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{
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id = ac->get_holderIssuer(ac);
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if (id && id->equals(id, subject->get_issuer(subject)))
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{
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if (verify(this, &ac->certificate))
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{
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apply(this, ac, auth);
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}
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}
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}
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enumerator->destroy(enumerator);
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serial->destroy(serial);
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}
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return TRUE;
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}
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METHOD(acert_validator_t, destroy, void,
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private_acert_validator_t *this)
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{
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free(this);
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}
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/**
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* See header
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*/
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acert_validator_t *acert_validator_create()
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{
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private_acert_validator_t *this;
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INIT(this,
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.public = {
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.validator.validate = _validate,
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.destroy = _destroy,
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},
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);
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return &this->public;
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}
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