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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: pubkey_authenticator.c 4495 2008-10-28 16:07:06Z martin $
*/
#include <string.h>
#include "pubkey_authenticator.h"
#include <daemon.h>
#include <credentials/auth_info.h>
typedef struct private_pubkey_authenticator_t private_pubkey_authenticator_t;
/**
* Private data of an pubkey_authenticator_t object.
*/
struct private_pubkey_authenticator_t {
/**
* Public authenticator_t interface.
*/
pubkey_authenticator_t public;
/**
* Assigned IKE_SA
*/
ike_sa_t *ike_sa;
};
/**
* Implementation of authenticator_t.verify.
*/
static status_t verify(private_pubkey_authenticator_t *this, chunk_t ike_sa_init,
chunk_t my_nonce, auth_payload_t *auth_payload)
{
public_key_t *public;
auth_method_t auth_method;
chunk_t auth_data, octets;
identification_t *id;
auth_info_t *auth, *current_auth;
enumerator_t *enumerator;
key_type_t key_type = KEY_ECDSA;
signature_scheme_t scheme;
status_t status = FAILED;
keymat_t *keymat;
id = this->ike_sa->get_other_id(this->ike_sa);
auth_method = auth_payload->get_auth_method(auth_payload);
switch (auth_method)
{
case AUTH_RSA:
/* We are currently fixed to SHA1 hashes.
* TODO: allow other hash algorithms and note it in "auth" */
key_type = KEY_RSA;
scheme = SIGN_RSA_EMSA_PKCS1_SHA1;
break;
case AUTH_ECDSA_256:
scheme = SIGN_ECDSA_256;
break;
case AUTH_ECDSA_384:
scheme = SIGN_ECDSA_384;
break;
case AUTH_ECDSA_521:
scheme = SIGN_ECDSA_521;
break;
default:
return INVALID_ARG;
}
auth_data = auth_payload->get_data(auth_payload);
keymat = this->ike_sa->get_keymat(this->ike_sa);
octets = keymat->get_auth_octets(keymat, TRUE, ike_sa_init, my_nonce, id);
auth = this->ike_sa->get_other_auth(this->ike_sa);
enumerator = charon->credentials->create_public_enumerator(
charon->credentials, key_type, id, auth);
while (enumerator->enumerate(enumerator, &public, ¤t_auth))
{
if (public->verify(public, scheme, octets, auth_data))
{
DBG1(DBG_IKE, "authentication of '%D' with %N successful",
id, auth_method_names, auth_method);
status = SUCCESS;
auth->merge(auth, current_auth);
break;
}
else
{
DBG1(DBG_IKE, "signature validation failed, looking for another key");
}
}
enumerator->destroy(enumerator);
chunk_free(&octets);
return status;
}
/**
* Implementation of authenticator_t.build.
*/
static status_t build(private_pubkey_authenticator_t *this, chunk_t ike_sa_init,
chunk_t other_nonce, auth_payload_t **auth_payload)
{
chunk_t octets, auth_data;
status_t status = FAILED;
private_key_t *private;
identification_t *id;
auth_info_t *auth;
auth_method_t auth_method;
signature_scheme_t scheme;
keymat_t *keymat;
id = this->ike_sa->get_my_id(this->ike_sa);
auth = this->ike_sa->get_my_auth(this->ike_sa);
private = charon->credentials->get_private(charon->credentials, KEY_ANY,
id, auth);
if (private == NULL)
{
DBG1(DBG_IKE, "no private key found for '%D'", id);
return NOT_FOUND;
}
switch (private->get_type(private))
{
case KEY_RSA:
/* we currently use always SHA1 for signatures,
* TODO: support other hashes depending on configuration/auth */
scheme = SIGN_RSA_EMSA_PKCS1_SHA1;
auth_method = AUTH_RSA;
break;
case KEY_ECDSA:
/* we try to deduct the signature scheme from the keysize */
switch (private->get_keysize(private))
{
case 32:
scheme = SIGN_ECDSA_256;
auth_method = AUTH_ECDSA_256;
break;
case 48:
scheme = SIGN_ECDSA_384;
auth_method = AUTH_ECDSA_384;
break;
case 66:
scheme = SIGN_ECDSA_521;
auth_method = AUTH_ECDSA_521;
break;
default:
DBG1(DBG_IKE, "%d bit ECDSA private key size not supported",
private->get_keysize(private));
return status;
}
break;
default:
DBG1(DBG_IKE, "private key of type %N not supported",
key_type_names, private->get_type(private));
return status;
}
keymat = this->ike_sa->get_keymat(this->ike_sa);
octets = keymat->get_auth_octets(keymat, FALSE, ike_sa_init, other_nonce, id);
if (private->sign(private, scheme, octets, &auth_data))
{
auth_payload_t *payload = auth_payload_create();
payload->set_auth_method(payload, auth_method);
payload->set_data(payload, auth_data);
*auth_payload = payload;
chunk_free(&auth_data);
status = SUCCESS;
}
DBG1(DBG_IKE, "authentication of '%D' (myself) with %N %s", id,
auth_method_names, auth_method,
(status == SUCCESS)? "successful":"failed");
chunk_free(&octets);
private->destroy(private);
return status;
}
/**
* Implementation of authenticator_t.destroy.
*/
static void destroy(private_pubkey_authenticator_t *this)
{
free(this);
}
/*
* Described in header.
*/
pubkey_authenticator_t *pubkey_authenticator_create(ike_sa_t *ike_sa)
{
private_pubkey_authenticator_t *this = malloc_thing(private_pubkey_authenticator_t);
/* public functions */
this->public.authenticator_interface.verify = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t*))verify;
this->public.authenticator_interface.build = (status_t(*)(authenticator_t*,chunk_t,chunk_t,auth_payload_t**))build;
this->public.authenticator_interface.destroy = (void(*)(authenticator_t*))destroy;
/* private data */
this->ike_sa = ike_sa;
return &this->public;
}
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