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/*
* Copyright (C) 2008 Tobias Brunner
* Copyright (C) 2005-2008 Martin Willi
* Copyright (C) 2005 Jan Hutter
* 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.
*
* $Id: authenticator.h 5003 2009-03-24 17:43:01Z martin $
*/
/**
* @defgroup authenticator authenticator
* @{ @ingroup authenticators
*/
#ifndef AUTHENTICATOR_H_
#define AUTHENTICATOR_H_
typedef enum auth_method_t auth_method_t;
typedef enum auth_class_t auth_class_t;
typedef struct authenticator_t authenticator_t;
#include <library.h>
#include <sa/ike_sa.h>
#include <config/peer_cfg.h>
#include <encoding/payloads/auth_payload.h>
/**
* Method to use for authentication, as defined in IKEv2.
*/
enum auth_method_t {
/**
* Computed as specified in section 2.15 of RFC using
* an RSA private key over a PKCS#1 padded hash.
*/
AUTH_RSA = 1,
/**
* Computed as specified in section 2.15 of RFC using the
* shared key associated with the identity in the ID payload
* and the negotiated prf function
*/
AUTH_PSK = 2,
/**
* Computed as specified in section 2.15 of RFC using a
* DSS private key over a SHA-1 hash.
*/
AUTH_DSS = 3,
/**
* ECDSA with SHA-256 on the P-256 curve as specified in RFC 4754
*/
AUTH_ECDSA_256 = 9,
/**
* ECDSA with SHA-384 on the P-384 curve as specified in RFC 4754
*/
AUTH_ECDSA_384 = 10,
/**
* ECDSA with SHA-512 on the P-521 curve as specified in RFC 4754
*/
AUTH_ECDSA_521 = 11,
};
/**
* enum names for auth_method_t.
*/
extern enum_name_t *auth_method_names;
/**
* Class of authentication to use. This is different to auth_method_t in that
* it does not specify a method, but a class of acceptable methods. The found
* certificate finally dictates wich method is used.
*/
enum auth_class_t {
/** authentication using public keys (RSA, ECDSA) */
AUTH_CLASS_PUBKEY = 1,
/** authentication using a pre-shared secrets */
AUTH_CLASS_PSK = 2,
/** authentication using EAP */
AUTH_CLASS_EAP = 3,
};
/**
* enum strings for auth_class_t
*/
extern enum_name_t *auth_class_names;
/**
* Authenticator interface implemented by the various authenticators.
*
* Currently the following two AUTH methods are supported:
* - shared key message integrity code
* - RSA digital signature
* - EAP using the EAP framework and one of the EAP plugins
* - ECDSA is supported using OpenSSL
*/
struct authenticator_t {
/**
* Verify a received authentication payload.
*
* @param ike_sa_init binary representation of received ike_sa_init
* @param my_nonce the sent nonce
* @param auth_payload authentication payload to verify
* @return
* - SUCCESS,
* - FAILED if verification failed
* - INVALID_ARG if auth_method does not match
* - NOT_FOUND if credentials not found
*/
status_t (*verify) (authenticator_t *this, chunk_t ike_sa_init,
chunk_t my_nonce, auth_payload_t *auth_payload);
/**
* Build an authentication payload to send to the other peer.
*
* @param ike_sa_init binary representation of sent ike_sa_init
* @param other_nonce the received nonce
* @param auth_payload the resulting authentication payload
* @return
* - SUCCESS,
* - NOT_FOUND if credentials not found
*/
status_t (*build) (authenticator_t *this, chunk_t ike_sa_init,
chunk_t other_nonce, auth_payload_t **auth_payload);
/**
* Destroys a authenticator_t object.
*/
void (*destroy) (authenticator_t *this);
};
/**
* Creates an authenticator for the specified auth class (as configured).
*
* @param ike_sa associated ike_sa
* @param class class of authentication to use
* @return authenticator_t object
*/
authenticator_t *authenticator_create_from_class(ike_sa_t *ike_sa,
auth_class_t class);
/**
* Creates an authenticator for method (as received in payload).
*
* @param ike_sa associated ike_sa
* @param method method as found in payload
* @return authenticator_t object
*/
authenticator_t *authenticator_create_from_method(ike_sa_t *ike_sa,
auth_method_t method);
#endif /** AUTHENTICATOR_H_ @}*/
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