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/**
* @file rsa_authenticator.c
*
* @brief Implementation of rsa_authenticator_t.
*
*/
/*
* Copyright (C) 2005-2006 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.
*/
#include <string.h>
#include "rsa_authenticator.h"
#include <daemon.h>
typedef struct private_rsa_authenticator_t private_rsa_authenticator_t;
/**
* Private data of an rsa_authenticator_t object.
*/
struct private_rsa_authenticator_t {
/**
* Public authenticator_t interface.
*/
rsa_authenticator_t public;
/**
* Assigned IKE_SA
*/
ike_sa_t *ike_sa;
};
/**
* Function implemented in psk_authenticator.c
*/
extern chunk_t build_tbs_octets(chunk_t ike_sa_init, chunk_t nonce,
identification_t *id, prf_t *prf);
/**
* Implementation of authenticator_t.verify.
*/
static status_t verify(private_rsa_authenticator_t *this, chunk_t ike_sa_init,
chunk_t my_nonce, auth_payload_t *auth_payload)
{
status_t status;
chunk_t auth_data, octets;
identification_t *other_id;
ca_info_t *issuer;
prf_t *prf;
other_id = this->ike_sa->get_other_id(this->ike_sa);
if (auth_payload->get_auth_method(auth_payload) != AUTH_RSA)
{
return INVALID_ARG;
}
auth_data = auth_payload->get_data(auth_payload);
prf = this->ike_sa->get_prf(this->ike_sa);
prf->set_key(prf, this->ike_sa->get_skp_verify(this->ike_sa));
octets = build_tbs_octets(ike_sa_init, my_nonce, other_id, prf);
status = charon->credentials->verify_signature(charon->credentials,
octets, auth_data, other_id, &issuer);
chunk_free(&octets);
if (status == SUCCESS)
{
this->ike_sa->set_other_ca(this->ike_sa, issuer);
DBG1(DBG_IKE, "authentication of '%D' with %N successful",
other_id, auth_method_names, AUTH_RSA);
}
return status;
}
/**
* Implementation of authenticator_t.build.
*/
static status_t build(private_rsa_authenticator_t *this, chunk_t ike_sa_init,
chunk_t other_nonce, auth_payload_t **auth_payload)
{
chunk_t chunk;
chunk_t octets;
chunk_t auth_data;
status_t status;
rsa_public_key_t *my_pubkey;
rsa_private_key_t *my_key;
identification_t *my_id;
prf_t *prf;
my_id = this->ike_sa->get_my_id(this->ike_sa);
DBG1(DBG_IKE, "authentication of '%D' (myself) with %N",
my_id, auth_method_names, AUTH_RSA);
DBG2(DBG_IKE, "looking for RSA public key belonging to '%D'", my_id);
my_pubkey = charon->credentials->get_rsa_public_key(charon->credentials, my_id);
if (my_pubkey == NULL)
{
DBG1(DBG_IKE, "no RSA public key found for '%D'", my_id);
return NOT_FOUND;
}
DBG2(DBG_IKE, "matching RSA public key found");
chunk = my_pubkey->get_keyid(my_pubkey);
DBG2(DBG_IKE, "looking for RSA private key with keyid %#B", &chunk);
my_key = charon->credentials->get_rsa_private_key(charon->credentials, my_pubkey);
if (my_key == NULL)
{
DBG1(DBG_IKE, "no RSA private key found with for %D with keyid %#B",
my_id, &chunk);
return NOT_FOUND;
}
DBG2(DBG_IKE, "matching RSA private key found");
prf = this->ike_sa->get_prf(this->ike_sa);
prf->set_key(prf, this->ike_sa->get_skp_build(this->ike_sa));
octets = build_tbs_octets(ike_sa_init, other_nonce, my_id, prf);
status = my_key->build_emsa_pkcs1_signature(my_key, HASH_SHA1, octets, &auth_data);
chunk_free(&octets);
if (status != SUCCESS)
{
my_key->destroy(my_key);
DBG1(DBG_IKE, "build signature of SHA1 hash failed");
return status;
}
DBG2(DBG_IKE, "successfully signed with RSA private key");
*auth_payload = auth_payload_create();
(*auth_payload)->set_auth_method(*auth_payload, AUTH_RSA);
(*auth_payload)->set_data(*auth_payload, auth_data);
my_key->destroy(my_key);
chunk_free(&auth_data);
return SUCCESS;
}
/**
* Implementation of authenticator_t.destroy.
*/
static void destroy(private_rsa_authenticator_t *this)
{
free(this);
}
/*
* Described in header.
*/
rsa_authenticator_t *rsa_authenticator_create(ike_sa_t *ike_sa)
{
private_rsa_authenticator_t *this = malloc_thing(private_rsa_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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