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/*
* Copyright (C) 2013 Tobias Brunner
* Copyright (C) 2012 Reto Guadagnini
* Hochschule fuer Technik Rapperswil
*
* 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.
*/
/*
* Copyright (C) 2013 Ruslan Marchenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include "dnscert_cred.h"
#include "dnscert.h"
typedef struct private_dnscert_cred_t private_dnscert_cred_t;
/**
* Private data of an dnscert_cred_t object
*/
struct private_dnscert_cred_t {
/**
* Public part
*/
dnscert_cred_t public;
/**
* DNS resolver
*/
resolver_t *res;
};
/**
* enumerator over certificates
*/
typedef struct {
/** implements enumerator interface */
enumerator_t public;
/** inner enumerator (enumerates CERT resource records) */
enumerator_t *inner;
/** response of the DNS resolver which contains the CERTs */
resolver_response_t *response;
} cert_enumerator_t;
METHOD(enumerator_t, cert_enumerator_enumerate, bool,
cert_enumerator_t *this, certificate_t **cert)
{
dnscert_t *cur_crt;
rr_t *cur_rr;
chunk_t certificate;
/* Get the next supported CERT using the inner enumerator. */
while (this->inner->enumerate(this->inner, &cur_rr))
{
cur_crt = dnscert_create_frm_rr(cur_rr);
if (!cur_crt)
{
DBG1(DBG_CFG, " failed to parse CERT RR, skipping");
continue;
}
if (cur_crt->get_cert_type(cur_crt) != DNSCERT_TYPE_PKIX &&
cur_crt->get_cert_type(cur_crt) != DNSCERT_TYPE_PGP)
{
DBG1(DBG_CFG, " unsupported CERT type [%d], skipping",
cur_crt->get_cert_type(cur_crt));
cur_crt->destroy(cur_crt);
continue;
}
/* Try to parse PEM certificate container. Both x509 and PGP should
* presumably come as PEM encoded certs. */
certificate = cur_crt->get_certificate(cur_crt);
*cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_ANY,
BUILD_BLOB_PEM, certificate,
BUILD_END);
if (*cert == NULL)
{
DBG1(DBG_CFG, " unable to parse certificate, skipping",
cur_crt->get_cert_type(cur_crt));
cur_crt->destroy(cur_crt);
continue;
}
cur_crt->destroy(cur_crt);
return TRUE;
}
return FALSE;
}
METHOD(enumerator_t, cert_enumerator_destroy, void,
cert_enumerator_t *this)
{
this->inner->destroy(this->inner);
this->response->destroy(this->response);
free(this);
}
METHOD(credential_set_t, create_cert_enumerator, enumerator_t*,
private_dnscert_cred_t *this, certificate_type_t cert, key_type_t key,
identification_t *id, bool trusted)
{
resolver_response_t *response;
cert_enumerator_t *e;
char *fqdn;
if (!id || id->get_type(id) != ID_FQDN)
{
return enumerator_create_empty();
}
/* query the DNS for the required CERT RRs */
if (asprintf(&fqdn, "%Y", id) <= 0)
{
DBG1(DBG_CFG, "failed to determine FQDN to retrieve CERT RRs");
return enumerator_create_empty();
}
DBG1(DBG_CFG, "performing a DNS query for CERT RRs of '%s'", fqdn);
response = this->res->query(this->res, fqdn, RR_CLASS_IN, RR_TYPE_CERT);
if (!response)
{
DBG1(DBG_CFG, " query for CERT RRs failed");
free(fqdn);
return enumerator_create_empty();
}
free(fqdn);
if (!response->has_data(response) ||
!response->query_name_exist(response))
{
DBG1(DBG_CFG, " unable to retrieve CERT RRs from the DNS");
response->destroy(response);
return enumerator_create_empty();
}
if (response->get_security_state(response) != SECURE)
{
DBG1(DBG_CFG, " DNSSEC state of CERT RRs is not secure");
response->destroy(response);
return enumerator_create_empty();
}
INIT(e,
.public = {
.enumerate = (void*)_cert_enumerator_enumerate,
.destroy = _cert_enumerator_destroy,
},
.inner = response->get_rr_set(response)->create_rr_enumerator(
response->get_rr_set(response)),
.response = response
);
return &e->public;
}
METHOD(dnscert_cred_t, destroy, void,
private_dnscert_cred_t *this)
{
this->res->destroy(this->res);
free(this);
}
/**
* Described in header.
*/
dnscert_cred_t *dnscert_cred_create(resolver_t *res)
{
private_dnscert_cred_t *this;
INIT(this,
.public = {
.set = {
.create_private_enumerator = (void*)return_null,
.create_cert_enumerator = _create_cert_enumerator,
.create_shared_enumerator = (void*)return_null,
.create_cdp_enumerator = (void*)return_null,
.cache_cert = (void*)nop,
},
.destroy = _destroy,
},
.res = res,
);
return &this->public;
}
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