dnscert: Add DNS CERT support for pubkey authentication

Add DNSSEC protected CERT RR delivered certificate authentication. The new dnscert plugin is based on the ipseckey plugin and relies on the existing PEM decoder as well as x509 and PGP parsers. As such the plugin expects PEM encoded PKIX(x509) or PGP(GPG) certificate payloads. The plugin is targeted to improve interoperability with Racoon, which supports this type of authentication, ignoring in-stream certificates and using only DNS provided certificates for FQDN IDs.
2013-10-11 15:45:42 +02:00
parent 8ac54970f5
commit b638c131de
9 changed files with 832 additions and 0 deletions
@@ -0,0 +1,166 @@
+/*
+ * 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.
+*/
+
+#include "dnscert_plugin.h"
+
+#include <daemon.h>
+#include "dnscert_cred.h"
+
+typedef struct private_dnscert_plugin_t private_dnscert_plugin_t;
+
+
+/**
+ * private data of the dnscert plugin
+ */
+struct private_dnscert_plugin_t {
+
+	/**
+	 * implements plugin interface
+	 */
+	dnscert_plugin_t public;
+
+	/**
+	 * credential set
+	 */
+	dnscert_cred_t *cred;
+
+	/**
+	 * DNSCERT based authentication enabled
+	 */
+	bool enabled;
+};
+
+METHOD(plugin_t, get_name, char*,
+	private_dnscert_plugin_t *this)
+{
+	return "dnscert";
+}
+
+METHOD(plugin_t, reload, bool,
+	private_dnscert_plugin_t *this)
+{
+	bool enabled = lib->settings->get_bool(lib->settings,
+							"%s.plugins.dnscert.enable", FALSE, charon->name);
+
+	if (enabled != this->enabled)
+	{
+		if (enabled)
+		{
+			lib->credmgr->add_set(lib->credmgr, &this->cred->set);
+		}
+		else
+		{
+			lib->credmgr->remove_set(lib->credmgr, &this->cred->set);
+		}
+		this->enabled = enabled;
+	}
+	DBG1(DBG_CFG, "dnscert plugin is %sabled", this->enabled ? "en" : "dis");
+	return TRUE;
+}
+
+/**
+ * Create resolver and register credential set
+ */
+static bool plugin_cb(private_dnscert_plugin_t *this,
+					  plugin_feature_t *feature, bool reg, void *cb_data)
+{
+	if (reg)
+	{
+		resolver_t *res;
+
+		res = lib->resolver->create(lib->resolver);
+		if (!res)
+		{
+			DBG1(DBG_CFG, "failed to create a DNS resolver instance");
+			return FALSE;
+		}
+
+		this->cred = dnscert_cred_create(res);
+		reload(this);
+	}
+	else
+	{
+		if (this->enabled)
+		{
+			lib->credmgr->remove_set(lib->credmgr, &this->cred->set);
+		}
+		this->cred->destroy(this->cred);
+	}
+	return TRUE;
+}
+
+METHOD(plugin_t, get_features, int,
+	private_dnscert_plugin_t *this, plugin_feature_t *features[])
+{
+	static plugin_feature_t f[] = {
+		PLUGIN_CALLBACK((plugin_feature_callback_t)plugin_cb, NULL),
+			PLUGIN_PROVIDE(CUSTOM, "dnscert"),
+				PLUGIN_DEPENDS(RESOLVER),
+				PLUGIN_DEPENDS(CERT_DECODE, CERT_ANY),
+				PLUGIN_SDEPEND(CERT_DECODE, CERT_X509),
+				PLUGIN_SDEPEND(CERT_DECODE, CERT_GPG),
+	};
+	*features = f;
+	return countof(f);
+}
+
+METHOD(plugin_t, destroy, void,
+	private_dnscert_plugin_t *this)
+{
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *dnscert_plugin_create()
+{
+	private_dnscert_plugin_t *this;
+
+	INIT(this,
+		.public = {
+			.plugin = {
+				.get_name = _get_name,
+				.get_features = _get_features,
+				.reload = _reload,
+				.destroy = _destroy,
+			},
+		},
+	);
+
+	return &this->public.plugin;
+}