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diff --git a/src/charon/config/auth_cfg.h b/src/charon/config/auth_cfg.h
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+/*
+ * Copyright (C) 2007-2009 Martin Willi
+ * Copyright (C) 2008 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 auth_cfg auth_cfg
+ * @{ @ingroup config
+ */
+
+#ifndef AUTH_CFG_H_
+#define AUTH_CFG_H_
+
+#include <utils/enumerator.h>
+
+typedef struct auth_cfg_t auth_cfg_t;
+typedef enum auth_rule_t auth_rule_t;
+
+/**
+ * Authentication config to use during authentication process.
+ *
+ * Each authentication config contains a set of rules. These rule-sets are used
+ * in two ways:
+ * - For configs specifying local authentication behavior, the rules define
+ *   which authentication method in which way.
+ * - For configs specifying remote peer authentication, the rules define
+ *   constraints the peer has to fullfill.
+ *
+ * Additionally to the rules, there is a set of helper items. These are used
+ * to transport credentials during the authentication process.
+ */
+enum auth_rule_t {
+	
+	/** identity to use for IKEv2 authentication exchange, identification_t* */
+	AUTH_RULE_IDENTITY,
+	/** authentication class, auth_class_t */
+	AUTH_RULE_AUTH_CLASS,
+	/** EAP identity to use within EAP-Identity exchange, identification_t* */
+	AUTH_RULE_EAP_IDENTITY,
+	/** EAP type to propose for peer authentication, eap_type_t */
+	AUTH_RULE_EAP_TYPE,
+	/** EAP vendor for vendor specific type, u_int32_t */
+	AUTH_RULE_EAP_VENDOR,
+	/** certificate authority, certificate_t* */
+	AUTH_RULE_CA_CERT,
+	/** intermediate certificate in trustchain, certificate_t* */
+	AUTH_RULE_IM_CERT,
+	/** subject certificate, certificate_t* */
+	AUTH_RULE_SUBJECT_CERT,
+	/** result of a CRL validation, cert_validation_t */
+	AUTH_RULE_CRL_VALIDATION,
+	/** result of a OCSP validation, cert_validation_t */
+	AUTH_RULE_OCSP_VALIDATION,
+	/** subject is in attribute certificate group, identification_t* */
+	AUTH_RULE_AC_GROUP,
+	
+	/** intermediate certificate, certificate_t* */
+	AUTH_HELPER_IM_CERT,
+	/** subject certificate, certificate_t* */
+	AUTH_HELPER_SUBJECT_CERT,
+	/** Hash and URL of a intermediate certificate, char* */
+	AUTH_HELPER_IM_HASH_URL,
+	/** Hash and URL of a end-entity certificate, char* */
+	AUTH_HELPER_SUBJECT_HASH_URL,
+};
+
+/**
+ * enum name for auth_rule_t.
+ */
+extern enum_name_t *auth_rule_names;
+
+/**
+ * Authentication/Authorization round.
+ *
+ * RFC4739 defines multiple authentication rounds. This class defines such
+ * a round from a configuration perspective, either for the local or the remote
+ * peer. Local config are called "rulesets", as they define how we authenticate.
+ * Remote peer configs are called "constraits", they define what is needed to 
+ * complete the authentication round successfully.
+ *
+ * @verbatim
+
+   [Repeat for each configuration]
+   +--------------------------------------------------+
+   |                                                  |
+   |                                                  |
+   |   +----------+     IKE_AUTH       +--------- +   |
+   |   |  config  |   ----------->     |          |   |
+   |   |  ruleset |                    |          |   |
+   |   +----------+ [ <----------- ]   |          |   |
+   |                [ optional EAP ]   |   Peer   |   |
+   |   +----------+ [ -----------> ]   |          |   |
+   |   |  config  |                    |          |   |
+   |   |  constr. |   <-----------     |          |   |
+   |   +----------+     IKE_AUTH       +--------- +   |
+   |                                                  |
+   |                                                  |
+   +--------------------------------------------------+
+
+   @endverbatim
+ *
+ * Values for each items are either pointers (casted to void*) or short
+ * integers (use uintptr_t cast).
+ */
+struct auth_cfg_t {
+
+	/**
+	 * Add an rule to the set.
+	 *
+	 * @param rule		rule type
+	 * @param ...		associated value to rule
+	 */
+	void (*add)(auth_cfg_t *this, auth_rule_t rule, ...);
+	
+	/**
+	 * Get an rule value.
+	 *
+	 * @param rule		rule type
+	 * @return			bool if item has been found
+	 */
+	void* (*get)(auth_cfg_t *this, auth_rule_t rule);
+	
+	/**
+	 * Create an enumerator over added rules.
+	 *
+	 * @return			enumerator over (auth_rule_t, union{void*,uintpr_t})
+	 */
+	enumerator_t* (*create_enumerator)(auth_cfg_t *this);
+	
+	/**
+	 * Replace an rule at enumerator position.
+	 *
+	 * @param pos		enumerator position position
+	 * @param rule		rule type
+	 * @param ...		associated value to rule
+	 */
+	void (*replace)(auth_cfg_t *this, enumerator_t *pos,
+					auth_rule_t rule, ...);
+	
+	/**
+	 * Check if a used config fulfills a set of configured constraints.
+	 *
+	 * @param constraints	required authorization rules
+	 * @param log_error		wheter to log compliance errors
+	 * @return				TRUE if this complies with constraints
+	 */
+	bool (*complies)(auth_cfg_t *this, auth_cfg_t *constraints, bool log_error);
+	
+	/**
+	 * Merge items from other into this.
+	 *
+	 * @param other		items to read for merge
+	 * @param copy		TRUE to copy items, FALSE to move them
+	 */
+	void (*merge)(auth_cfg_t *this, auth_cfg_t *other, bool copy);
+	
+	/**
+	 * Purge all rules in a config.
+	 *
+	 * @param keep_ca	wheter to keep AUTH_RULE_CA_CERT entries
+	 */
+	void (*purge)(auth_cfg_t *this, bool keep_ca);
+	
+	/**
+	 * Check two configs for equality.
+	 *
+	 * @param other		other config to compaire against this
+	 * @return			TRUE if auth infos identical
+	 */
+	bool (*equals)(auth_cfg_t *this, auth_cfg_t *other);
+	
+	/**
+	 * Clone a authentication config, including all rules.
+	 *
+	 * @return			cloned configuration
+	 */
+	auth_cfg_t* (*clone)(auth_cfg_t *this);
+	
+	/**
+	 * Destroy a config with all associated rules/values.
+	 */
+	void (*destroy)(auth_cfg_t *this);
+};
+
+/**
+ * Create a authentication config.
+ */
+auth_cfg_t *auth_cfg_create();
+
+#endif /** AUTH_CFG_H_ @}*/