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/*
* Copyright (C) 2005-2009 Martin Willi
* Copyright (C) 2008 Tobias Brunner
* 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.
*/
/**
* @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 <config/auth_cfg.h>
#include <sa/ike_sa.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 {
/** any class acceptable */
AUTH_CLASS_ANY = 0,
/** 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.
*
* An authenticator implementation handles AUTH and EAP payloads. Received
* messages are passed to the process() method, to send authentication data
* the message is passed to the build() method.
*/
struct authenticator_t {
/**
* Process an incoming message using the authenticator.
*
* @param message message containing authentication payloads
* @return
* - SUCCESS if authentication successful
* - FAILED if authentication failed
* - NEED_MORE if another exchange required
*/
status_t (*process)(authenticator_t *this, message_t *message);
/**
* Attach authentication data to an outgoing message.
*
* @param message message to add authentication data to
* @return
* - SUCCESS if authentication successful
* - FAILED if authentication failed
* - NEED_MORE if another exchange required
*/
status_t (*build)(authenticator_t *this, message_t *message);
/**
* Check if the authenticator is capable of mutual authentication.
*
* Some authenticator authenticate both peers, e.g. EAP. To support
* mutual authentication with only a single authenticator (EAP-only
* authentication), it must be mutual. This method is invoked in ike_auth
* to check if the given authenticator is capable of doing so.
*/
bool (*is_mutual)(authenticator_t *this);
/**
* Destroy authenticator instance.
*/
void (*destroy) (authenticator_t *this);
};
/**
* Create an authenticator to build signatures.
*
* @param ike_sa associated ike_sa
* @param cfg authentication configuration
* @param received_nonce nonce received in IKE_SA_INIT
* @param sent_nonce nonce sent in IKE_SA_INIT
* @param received_init received IKE_SA_INIT message data
* @param sent_init sent IKE_SA_INIT message data
* @return authenticator, NULL if not supported
*/
authenticator_t *authenticator_create_builder(
ike_sa_t *ike_sa, auth_cfg_t *cfg,
chunk_t received_nonce, chunk_t sent_nonce,
chunk_t received_init, chunk_t sent_init);
/**
* Create an authenticator to verify signatures.
*
* @param ike_sa associated ike_sa
* @param message message containing authentication data
* @param received_nonce nonce received in IKE_SA_INIT
* @param sent_nonce nonce sent in IKE_SA_INIT
* @param received_init received IKE_SA_INIT message data
* @param sent_init sent IKE_SA_INIT message data
* @return authenticator, NULL if not supported
*/
authenticator_t *authenticator_create_verifier(
ike_sa_t *ike_sa, message_t *message,
chunk_t received_nonce, chunk_t sent_nonce,
chunk_t received_init, chunk_t sent_init);
#endif /** AUTHENTICATOR_H_ @}*/
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