Register a certexpire listener collecting trustchain information

src/libcharon/plugins/certexpire/Makefile.am

@@ -11,6 +11,7 @@ else
 plugin_LTLIBRARIES = libstrongswan-certexpire.la
 endif
 
-libstrongswan_certexpire_la_SOURCES = certexpire_plugin.h certexpire_plugin.c
+libstrongswan_certexpire_la_SOURCES = certexpire_plugin.h certexpire_plugin.c \
+	certexpire_listener.h certexpire_listener.c
 
 libstrongswan_certexpire_la_LDFLAGS = -module -avoid-version

src/libcharon/plugins/certexpire/certexpire_listener.c

@@ -0,0 +1,142 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 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.
+ */
+
+#include "certexpire_listener.h"
+
+#include <daemon.h>
+
+typedef struct private_certexpire_listener_t private_certexpire_listener_t;
+
+/**
+ * Private data of an certexpire_listener_t object.
+ */
+struct private_certexpire_listener_t {
+
+	/**
+	 * Public certexpire_listener_t interface.
+	 */
+	certexpire_listener_t public;
+};
+
+METHOD(listener_t, authorize, bool,
+	private_certexpire_listener_t *this, ike_sa_t *ike_sa,
+	bool final, bool *success)
+{
+	enumerator_t *rounds, *enumerator;
+	certificate_t *cert, *ca = NULL;
+	linked_list_t *trustchain;
+	auth_cfg_t *auth;
+	auth_rule_t rule;
+
+	/* Check all rounds in final hook, as local authentication data are
+	 * not completely available after round-invocation. */
+	if (!final)
+	{
+		return TRUE;
+	}
+
+	/* collect local certificates */
+	trustchain = linked_list_create();
+	rounds = ike_sa->create_auth_cfg_enumerator(ike_sa, TRUE);
+	while (rounds->enumerate(rounds, &auth))
+	{
+		cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
+		if (cert)
+		{
+			trustchain->insert_last(trustchain, cert);
+
+			enumerator = auth->create_enumerator(auth);
+			while (enumerator->enumerate(enumerator, &rule, &cert))
+			{
+				if (rule == AUTH_RULE_IM_CERT)
+				{
+					trustchain->insert_last(trustchain, cert);
+				}
+				if (rule == AUTH_RULE_CA_CERT)
+				{
+					/* the last CA cert is the one used in the trustchain.
+					 * Previous CA certificates have been received as cert
+					 * requests. */
+					ca = cert;
+				}
+			}
+			enumerator->destroy(enumerator);
+			if (ca)
+			{
+				trustchain->insert_last(trustchain, ca);
+			}
+		}
+	}
+	rounds->destroy(rounds);
+	/* TODO: handle trustchain expiry information */
+	trustchain->destroy(trustchain);
+
+	/* collect remote certificates */
+	trustchain = linked_list_create();
+	rounds = ike_sa->create_auth_cfg_enumerator(ike_sa, FALSE);
+	while (rounds->enumerate(rounds, &auth))
+	{
+		cert = auth->get(auth, AUTH_RULE_SUBJECT_CERT);
+		if (cert)
+		{
+			trustchain->insert_last(trustchain, cert);
+
+			enumerator = auth->create_enumerator(auth);
+			while (enumerator->enumerate(enumerator, &rule, &cert))
+			{
+				if (rule == AUTH_RULE_IM_CERT)
+				{
+					trustchain->insert_last(trustchain, cert);
+				}
+			}
+			enumerator->destroy(enumerator);
+
+			cert = auth->get(auth, AUTH_RULE_CA_CERT);
+			if (cert)
+			{
+				trustchain->insert_last(trustchain, cert);
+			}
+		}
+	}
+	rounds->destroy(rounds);
+	/* TODO: handle trustchain expiry information */
+	trustchain->destroy(trustchain);
+	return TRUE;
+}
+
+METHOD(certexpire_listener_t, destroy, void,
+	private_certexpire_listener_t *this)
+{
+	free(this);
+}
+
+/**
+ * See header
+ */
+certexpire_listener_t *certexpire_listener_create()
+{
+	private_certexpire_listener_t *this;
+
+	INIT(this,
+		.public = {
+			.listener = {
+				.authorize = _authorize,
+			},
+			.destroy = _destroy,
+		},
+	);
+
+	return &this->public;
+}

src/libcharon/plugins/certexpire/certexpire_listener.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2011 Martin Willi
+ * Copyright (C) 2011 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.
+ */
+
+/**
+ * @defgroup certexpire_listener certexpire_listener
+ * @{ @ingroup certexpire
+ */
+
+#ifndef CERTEXPIRE_LISTENER_H_
+#define CERTEXPIRE_LISTENER_H_
+
+#include <bus/listeners/listener.h>
+
+typedef struct certexpire_listener_t certexpire_listener_t;
+
+/**
+ * Listener collecting certificate expire information after authentication.
+ */
+struct certexpire_listener_t {
+
+	/**
+	 * Implements listener_t interface.
+	 */
+	listener_t listener;
+
+	/**
+	 * Destroy a certexpire_listener_t.
+	 */
+	void (*destroy)(certexpire_listener_t *this);
+};
+
+/**
+ * Create a certexpire_listener instance.
+ */
+certexpire_listener_t *certexpire_listener_create();
+
+#endif /** CERTEXPIRE_LISTENER_H_ @}*/

src/libcharon/plugins/certexpire/certexpire_plugin.c

@@ -15,6 +15,8 @@
 
 #include "certexpire_plugin.h"
 
+#include "certexpire_listener.h"
+
 #include <daemon.h>
 
 typedef struct private_certexpire_plugin_t private_certexpire_plugin_t;
@@ -28,6 +30,11 @@ struct private_certexpire_plugin_t {
 	 * Implements plugin interface
 	 */
 	certexpire_plugin_t public;
+
+	/**
+	 * Listener collecting expire information
+	 */
+	certexpire_listener_t *listener;
 };
 
 METHOD(plugin_t, get_name, char*,
@@ -39,6 +46,8 @@ METHOD(plugin_t, get_name, char*,
 METHOD(plugin_t, destroy, void,
 	private_certexpire_plugin_t *this)
 {
+	charon->bus->remove_listener(charon->bus, &this->listener->listener);
+	this->listener->destroy(this->listener);
 	free(this);
 }
 
@@ -57,7 +66,9 @@ plugin_t *certexpire_plugin_create()
 				.destroy = _destroy,
 			},
 		},
+		.listener = certexpire_listener_create(),
 	);
+	charon->bus->add_listener(charon->bus, &this->listener->listener);
 
 	return &this->public.plugin;
 }