Implemented a TLS session cache

2011-12-31 13:14:49 +01:00
parent 703c0db894
commit ca5767621b
3 changed files with 316 additions and 0 deletions
@@ -0,0 +1,78 @@
+/*
+ * 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 tls_cache tls_cache
+ * @{ @ingroup libtls
+ */
+
+#ifndef TLS_CACHE_H_
+#define TLS_CACHE_H_
+
+typedef struct tls_cache_t tls_cache_t;
+
+#include "tls_crypto.h"
+
+/**
+ * TLS session cache facility.
+ */
+struct tls_cache_t {
+
+	/**
+	 * Create a new TLS session entry.
+	 *
+	 * @param session		session identifier
+	 * @param id			identity the session is bound to
+	 * @param master		TLS master secret
+	 * @param suite			TLS cipher suite of the session
+	 */
+	void (*create)(tls_cache_t *this, chunk_t session, identification_t *id,
+				   chunk_t master, tls_cipher_suite_t suite);
+
+	/**
+	 * Look up a TLS session entry.
+	 *
+	 * @param session		session ID to find
+	 * @param id			identity the session is bound to
+	 * @param master		gets allocated master secret, if session found
+	 * @return				TLS suite of session, 0 if none found
+	 */
+	tls_cipher_suite_t (*lookup)(tls_cache_t *this, chunk_t session,
+								 identification_t *id, chunk_t* master);
+
+	/**
+	 * Check if we have a session for a given identity.
+	 *
+	 * @param id			identity to check
+	 * @return				allocated session ID, or chunk_empty
+	 */
+	chunk_t (*check)(tls_cache_t *this, identification_t *id);
+
+	/**
+	 * Destroy a tls_cache_t.
+	 */
+	void (*destroy)(tls_cache_t *this);
+};
+
+/**
+ * Create a tls_cache instance.
+ *
+ * @param max_sessions		maximum number of sessions to store
+ * @param max_age			maximum age of a session, in seconds
+ * @return					tls cache
+ */
+tls_cache_t *tls_cache_create(u_int max_sessions, u_int max_age);
+
+#endif /** TLS_CACHE_H_ @}*/