Adding an Android specific credential set.

src/libcharon/Android.mk

@@ -106,6 +106,7 @@ credentials/credential_set.h
 
 LOCAL_SRC_FILES += $(call add_plugin, android)
 ifneq ($(call plugin_enabled, android)),)
+LOCAL_C_INCLUDES += frameworks/base/cmds/keystore
 LOCAL_SHARED_LIBRARIES += libcutils
 endif
 

src/libcharon/plugins/android/Makefile.am

@@ -13,7 +13,8 @@ endif
 libstrongswan_android_la_SOURCES = \
 	android_plugin.c android_plugin.h \
 	android_handler.c android_handler.h \
-	android_logger.c android_logger.h
+	android_logger.c android_logger.h \
+	android_creds.c android_creds.h
 
 libstrongswan_android_la_LDFLAGS = -module -avoid-version
 libstrongswan_android_la_LIBADD  = -lcutils

src/libcharon/plugins/android/android_creds.c

@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2010 Tobias Brunner
+ * 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.
+ */
+
+#include <keystore_get.h>
+
+#include "android_creds.h"
+
+#include <daemon.h>
+#include <threading/rwlock.h>
+
+typedef struct private_android_creds_t private_android_creds_t;
+
+/**
+ * Private data of an android_creds_t object
+ */
+struct private_android_creds_t {
+
+	/**
+	 * Public interface
+	 */
+	android_creds_t public;
+
+	/**
+	 * List of trusted certificates, certificate_t*
+	 */
+	linked_list_t *certs;
+
+	/**
+	 * User name (ID)
+	 */
+	identification_t *user;
+
+	/**
+	 * User password
+	 */
+	char *pass;
+
+	/**
+	 * read/write lock
+	 */
+	rwlock_t *lock;
+
+};
+
+/**
+ * Certificate enumerator data
+ */
+typedef struct {
+	private_android_creds_t *this;
+	key_type_t key;
+	identification_t *id;
+} cert_data_t;
+
+/**
+ * Filter function for certificates enumerator
+ */
+static bool cert_filter(cert_data_t *data, certificate_t **in,
+						certificate_t **out)
+{
+	certificate_t *cert = *in;
+	public_key_t *public;
+
+	public = cert->get_public_key(cert);
+	if (!public)
+	{
+		return FALSE;
+	}
+	if (data->key != KEY_ANY && public->get_type(public) != data->key)
+	{
+		public->destroy(public);
+		return FALSE;
+	}
+	if (data->id && data->id->get_type(data->id) == ID_KEY_ID &&
+		public->has_fingerprint(public, data->id->get_encoding(data->id)))
+	{
+		public->destroy(public);
+		*out = cert;
+		return TRUE;
+	}
+	public->destroy(public);
+	if (data->id && !cert->has_subject(cert, data->id))
+	{
+		return FALSE;
+	}
+	*out = cert;
+	return TRUE;
+}
+
+/**
+ * Destroy certificate enumerator data
+ */
+static void cert_data_destroy(cert_data_t *this)
+{
+	this->this->lock->unlock(this->this->lock);
+	free(this);
+}
+
+METHOD(credential_set_t, create_cert_enumerator, enumerator_t*,
+	   private_android_creds_t *this, certificate_type_t cert, key_type_t key,
+	   identification_t *id, bool trusted)
+{
+	if (cert == CERT_X509 || cert == CERT_ANY)
+	{
+		cert_data_t *data;
+		this->lock->read_lock(this->lock);
+		INIT(data, .this = this, .id = id, .key = key);
+		return enumerator_create_filter(
+						this->certs->create_enumerator(this->certs),
+						(void*)cert_filter, data, (void*)cert_data_destroy);
+	}
+	return NULL;
+}
+
+/**
+ * Shared key enumerator implementation
+ */
+typedef struct {
+	enumerator_t public;
+	private_android_creds_t *this;
+	shared_key_t *key;
+	bool done;
+} shared_enumerator_t;
+
+METHOD(enumerator_t, shared_enumerate, bool,
+	   shared_enumerator_t *this, shared_key_t **key, id_match_t *me,
+	   id_match_t *other)
+{
+	if (this->done)
+	{
+		return FALSE;
+	}
+	*key = this->key;
+	*me = ID_MATCH_PERFECT;
+	*other = ID_MATCH_ANY;
+	this->done = TRUE;
+	return TRUE;
+}
+
+METHOD(enumerator_t, shared_destroy, void,
+	   shared_enumerator_t *this)
+{
+	this->key->destroy(this->key);
+	this->this->lock->unlock(this->this->lock);
+	free(this);
+}
+
+METHOD(credential_set_t, create_shared_enumerator, enumerator_t*,
+	   private_android_creds_t *this, shared_key_type_t type,
+	   identification_t *me, identification_t *other)
+{
+	shared_enumerator_t *enumerator;
+
+	this->lock->read_lock(this->lock);
+
+	if (!this->user || !this->pass)
+	{
+		this->lock->unlock(this->lock);
+		return NULL;
+	}
+	if (type != SHARED_EAP && type != SHARED_IKE)
+	{
+		this->lock->unlock(this->lock);
+		return NULL;
+	}
+	if (me && !me->equals(me, this->user))
+	{
+		this->lock->unlock(this->lock);
+		return NULL;
+	}
+
+	INIT(enumerator,
+		.public = {
+			.enumerate = (void*)_shared_enumerate,
+			.destroy = _shared_destroy,
+		},
+		.this = this,
+		.done = FALSE,
+		.key = shared_key_create(type, chunk_clone(chunk_create(this->pass,
+												   strlen(this->pass)))),
+	);
+	return &enumerator->public;
+}
+
+METHOD(android_creds_t, add_certificate, bool,
+	   private_android_creds_t *this, char *name)
+{
+	certificate_t *cert = NULL;
+	bool status = FALSE;
+	chunk_t chunk;
+	this->lock->write_lock(this->lock);
+	chunk.ptr = keystore_get(name, &chunk.len);
+	if (chunk.ptr)
+	{
+		cert = lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
+								  BUILD_BLOB_PEM, chunk, BUILD_END);
+		if (cert)
+		{
+			this->certs->insert_last(this->certs, cert);
+			status = TRUE;
+		}
+		free(chunk.ptr);
+	}
+	this->lock->unlock(this->lock);
+	return status;
+}
+
+METHOD(android_creds_t, set_username_password, void,
+	   private_android_creds_t *this, identification_t *id, char *password)
+{
+	this->lock->write_lock(this->lock);
+	DESTROY_IF(this->user);
+	this->user = id->clone(id);
+	free(this->pass);
+	this->pass = password ? strdup(password) : NULL;
+	this->lock->unlock(this->lock);
+}
+
+METHOD(android_creds_t, clear, void,
+	   private_android_creds_t *this)
+{
+	certificate_t *cert;
+	this->lock->write_lock(this->lock);
+	while (this->certs->remove_last(this->certs, (void**)&cert) == SUCCESS)
+	{
+		cert->destroy(cert);
+	}
+	DESTROY_IF(this->user);
+	free(this->pass);
+	this->user = NULL;
+	this->pass = NULL;
+	this->lock->unlock(this->lock);
+}
+
+METHOD(android_creds_t, destroy, void,
+	   private_android_creds_t *this)
+{
+	clear(this);
+	this->certs->destroy(this->certs);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/**
+ * Described in header.
+ */
+android_creds_t *android_creds_create()
+{
+	private_android_creds_t *this;
+
+	INIT(this,
+		.public = {
+			.set = {
+				.create_cert_enumerator = _create_cert_enumerator,
+				.create_shared_enumerator = _create_shared_enumerator,
+				.create_private_enumerator = (void*)return_null,
+				.create_cdp_enumerator = (void*)return_null,
+				.cache_cert = (void*)nop,
+			},
+			.add_certificate = _add_certificate,
+			.set_username_password = _set_username_password,
+			.clear = _clear,
+			.destroy = _destroy,
+		},
+		.certs = linked_list_create(),
+		.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
+	);
+
+	return &this->public;
+}
+

src/libcharon/plugins/android/android_creds.h

@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2010 Tobias Brunner
+ * 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.
+ */
+
+/**
+ * @defgroup android_creds android_creds
+ * @{ @ingroup android
+ */
+
+#ifndef ANDROID_CREDS_H_
+#define ANDROID_CREDS_H_
+
+#include <credentials/credential_set.h>
+
+typedef struct android_creds_t android_creds_t;
+
+/**
+ * Android credentials helper.
+ */
+struct android_creds_t {
+
+	/**
+	 * Implements credential_set_t
+	 */
+	credential_set_t set;
+
+	/**
+	 * Add a trusted CA certificate from the Android keystore to serve by
+	 * this set.
+	 *
+	 * @param name		name/ID of the certificate in the keystore
+	 * @return			FALSE if the certificate does not exist or is invalid
+	 */
+	bool (*add_certificate)(android_creds_t *this, char *name);
+
+	/**
+	 * Set the username and password for authentication.
+	 *
+	 * @param id		ID of the user
+	 * @param password	password to use for authentication
+	 */
+	void (*set_username_password)(android_creds_t *this, identification_t *id,
+								  char *password);
+
+	/**
+	 * Clear the stored credentials.
+	 */
+	void (*clear)(android_creds_t *this);
+
+	/**
+	 * Destroy a android_creds instance.
+	 */
+	void (*destroy)(android_creds_t *this);
+
+};
+
+/**
+ * Create an android_creds instance.
+ */
+android_creds_t *android_creds_create();
+
+#endif /** ANDROID_CREDS_H_ @}*/

src/libcharon/plugins/android/android_plugin.c

@@ -16,6 +16,7 @@
 #include "android_plugin.h"
 #include "android_logger.h"
 #include "android_handler.h"
+#include "android_creds.h"
 
 #include <hydra.h>
 #include <daemon.h>
@@ -41,6 +42,12 @@ struct private_android_plugin_t {
 	 * Android specific DNS handler
 	 */
 	android_handler_t *handler;
+
+	/**
+	 * Android specific credential set
+	 */
+	android_creds_t *creds;
+
 };
 
 METHOD(plugin_t, destroy, void,
@@ -48,7 +55,9 @@ METHOD(plugin_t, destroy, void,
 {
 	hydra->attributes->remove_handler(hydra->attributes,
 									  &this->handler->handler);
+	charon->credentials->remove_set(charon->credentials, &this->creds->set);
 	charon->bus->remove_listener(charon->bus, &this->logger->listener);
+	this->creds->destroy(this->creds);
 	this->handler->destroy(this->handler);
 	this->logger->destroy(this->logger);
 	free(this);
@@ -67,9 +76,11 @@ plugin_t *android_plugin_create()
 		},
 		.logger = android_logger_create(),
 		.handler = android_handler_create(),
+		.creds = android_creds_create(),
 	);
 
 	charon->bus->add_listener(charon->bus, &this->logger->listener);
+	charon->credentials->add_set(charon->credentials, &this->creds->set);
 	hydra->attributes->add_handler(hydra->attributes, &this->handler->handler);
 
 	return &this->public.plugin;