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/*
* Copyright (C) 2007-2008 Martin Willi
* 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 "eap_identity.h"
#include <daemon.h>
#include <library.h>
typedef struct private_eap_identity_t private_eap_identity_t;
/**
* Private data of an eap_identity_t object.
*/
struct private_eap_identity_t {
/**
* Public authenticator_t interface.
*/
eap_identity_t public;
/**
* ID of the peer
*/
identification_t *peer;
/**
* received identity chunk
*/
chunk_t identity;
};
typedef struct eap_identity_header_t eap_identity_header_t;
/**
* packed EAP Identity header struct
*/
struct eap_identity_header_t {
/** EAP code (REQUEST/RESPONSE) */
u_int8_t code;
/** unique message identifier */
u_int8_t identifier;
/** length of whole message */
u_int16_t length;
/** EAP type */
u_int8_t type;
/** identity data */
u_int8_t data[];
} __attribute__((__packed__));
/**
* Implementation of eap_method_t.process for the peer
*/
static status_t process_peer(private_eap_identity_t *this,
eap_payload_t *in, eap_payload_t **out)
{
chunk_t id;
eap_identity_header_t *hdr;
size_t len;
id = this->peer->get_encoding(this->peer);
len = sizeof(eap_identity_header_t) + id.len;
hdr = alloca(len);
hdr->code = EAP_RESPONSE;
hdr->identifier = in->get_identifier(in);
hdr->length = htons(len);
hdr->type = EAP_IDENTITY;
memcpy(hdr->data, id.ptr, id.len);
*out = eap_payload_create_data(chunk_create((u_char*)hdr, len));
return SUCCESS;
}
/**
* Implementation of eap_method_t.initiate for the peer
*/
static status_t initiate_peer(private_eap_identity_t *this, eap_payload_t **out)
{
/* peer never initiates */
return FAILED;
}
/**
* Implementation of eap_method_t.process for the server
*/
static status_t process_server(private_eap_identity_t *this,
eap_payload_t *in, eap_payload_t **out)
{
chunk_t data;
data = chunk_skip(in->get_data(in), 5);
if (data.len)
{
this->identity = chunk_clone(data);
}
return SUCCESS;
}
/**
* Implementation of eap_method_t.initiate for the server
*/
static status_t initiate_server(private_eap_identity_t *this, eap_payload_t **out)
{
eap_identity_header_t hdr;
hdr.code = EAP_REQUEST;
hdr.identifier = 0;
hdr.length = htons(sizeof(eap_identity_header_t));
hdr.type = EAP_IDENTITY;
*out = eap_payload_create_data(chunk_create((u_char*)&hdr,
sizeof(eap_identity_header_t)));
return NEED_MORE;
}
/**
* Implementation of eap_method_t.get_type.
*/
static eap_type_t get_type(private_eap_identity_t *this, u_int32_t *vendor)
{
*vendor = 0;
return EAP_IDENTITY;
}
/**
* Implementation of eap_method_t.get_msk.
*/
static status_t get_msk(private_eap_identity_t *this, chunk_t *msk)
{
if (this->identity.ptr)
{
*msk = this->identity;
return SUCCESS;
}
return FAILED;
}
/**
* Implementation of eap_method_t.is_mutual.
*/
static bool is_mutual(private_eap_identity_t *this)
{
return FALSE;
}
/**
* Implementation of eap_method_t.destroy.
*/
static void destroy(private_eap_identity_t *this)
{
this->peer->destroy(this->peer);
free(this->identity.ptr);
free(this);
}
/**
* Generic constructor
*/
static private_eap_identity_t *eap_identity_create(identification_t *server,
identification_t *peer)
{
private_eap_identity_t *this = malloc_thing(private_eap_identity_t);
this->public.eap_method_interface.initiate = NULL;
this->public.eap_method_interface.process = NULL;
this->public.eap_method_interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
this->public.eap_method_interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
this->public.eap_method_interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
this->public.eap_method_interface.destroy = (void(*)(eap_method_t*))destroy;
this->peer = peer->clone(peer);
this->identity = chunk_empty;
return this;
}
/*
* Described in header.
*/
eap_identity_t *eap_identity_create_peer(identification_t *server,
identification_t *peer)
{
private_eap_identity_t *this = eap_identity_create(server, peer);
/* public functions */
this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate_peer;
this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process_peer;
return &this->public;
}
/*
* Described in header.
*/
eap_identity_t *eap_identity_create_server(identification_t *server,
identification_t *peer)
{
private_eap_identity_t *this = eap_identity_create(server, peer);
/* public functions */
this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate_server;
this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process_server;
return &this->public;
}
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