221 lines
5.3 KiB
C
221 lines
5.3 KiB
C
/*
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* Copyright (C) 2007-2008 Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* $Id$
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*/
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#include "eap_identity.h"
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#include <daemon.h>
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#include <library.h>
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typedef struct private_eap_identity_t private_eap_identity_t;
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/**
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* Private data of an eap_identity_t object.
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*/
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struct private_eap_identity_t {
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/**
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* Public authenticator_t interface.
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*/
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eap_identity_t public;
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/**
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* ID of the peer
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*/
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identification_t *peer;
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/**
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* received identity chunk
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*/
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chunk_t identity;
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};
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typedef struct eap_identity_header_t eap_identity_header_t;
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/**
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* packed EAP Identity header struct
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*/
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struct eap_identity_header_t {
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/** EAP code (REQUEST/RESPONSE) */
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u_int8_t code;
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/** unique message identifier */
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u_int8_t identifier;
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/** length of whole message */
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u_int16_t length;
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/** EAP type */
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u_int8_t type;
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/** identity data */
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u_int8_t data[];
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} __attribute__((__packed__));
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/**
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* Implementation of eap_method_t.process for the peer
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*/
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static status_t process_peer(private_eap_identity_t *this,
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eap_payload_t *in, eap_payload_t **out)
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{
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chunk_t id;
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eap_identity_header_t *hdr;
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size_t len;
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id = this->peer->get_encoding(this->peer);
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len = sizeof(eap_identity_header_t) + id.len;
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hdr = alloca(len);
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hdr->code = EAP_RESPONSE;
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hdr->identifier = in->get_identifier(in);
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hdr->length = htons(len);
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hdr->type = EAP_IDENTITY;
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memcpy(hdr->data, id.ptr, id.len);
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*out = eap_payload_create_data(chunk_create((u_char*)hdr, len));
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return SUCCESS;
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}
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/**
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* Implementation of eap_method_t.initiate for the peer
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*/
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static status_t initiate_peer(private_eap_identity_t *this, eap_payload_t **out)
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{
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/* peer never initiates */
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return FAILED;
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}
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/**
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* Implementation of eap_method_t.process for the server
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*/
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static status_t process_server(private_eap_identity_t *this,
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eap_payload_t *in, eap_payload_t **out)
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{
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chunk_t data;
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data = chunk_skip(in->get_data(in), 5);
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if (data.len)
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{
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this->identity = chunk_clone(data);
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}
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return SUCCESS;
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}
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/**
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* Implementation of eap_method_t.initiate for the server
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*/
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static status_t initiate_server(private_eap_identity_t *this, eap_payload_t **out)
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{
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eap_identity_header_t hdr;
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hdr.code = EAP_REQUEST;
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hdr.identifier = 0;
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hdr.length = htons(sizeof(eap_identity_header_t));
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hdr.type = EAP_IDENTITY;
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*out = eap_payload_create_data(chunk_create((u_char*)&hdr,
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sizeof(eap_identity_header_t)));
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return NEED_MORE;
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}
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/**
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* Implementation of eap_method_t.get_type.
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*/
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static eap_type_t get_type(private_eap_identity_t *this, u_int32_t *vendor)
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{
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*vendor = 0;
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return EAP_IDENTITY;
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}
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/**
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* Implementation of eap_method_t.get_msk.
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*/
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static status_t get_msk(private_eap_identity_t *this, chunk_t *msk)
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{
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if (this->identity.ptr)
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{
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*msk = this->identity;
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return SUCCESS;
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}
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return FAILED;
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}
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/**
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* Implementation of eap_method_t.is_mutual.
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*/
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static bool is_mutual(private_eap_identity_t *this)
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{
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return FALSE;
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}
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/**
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* Implementation of eap_method_t.destroy.
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*/
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static void destroy(private_eap_identity_t *this)
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{
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this->peer->destroy(this->peer);
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free(this->identity.ptr);
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free(this);
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}
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/**
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* Generic constructor
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*/
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static private_eap_identity_t *eap_identity_create(identification_t *server,
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identification_t *peer)
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{
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private_eap_identity_t *this = malloc_thing(private_eap_identity_t);
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this->public.eap_method_interface.initiate = NULL;
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this->public.eap_method_interface.process = NULL;
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this->public.eap_method_interface.get_type = (eap_type_t(*)(eap_method_t*,u_int32_t*))get_type;
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this->public.eap_method_interface.is_mutual = (bool(*)(eap_method_t*))is_mutual;
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this->public.eap_method_interface.get_msk = (status_t(*)(eap_method_t*,chunk_t*))get_msk;
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this->public.eap_method_interface.destroy = (void(*)(eap_method_t*))destroy;
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this->peer = peer->clone(peer);
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this->identity = chunk_empty;
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return this;
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}
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/*
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* Described in header.
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*/
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eap_identity_t *eap_identity_create_peer(identification_t *server,
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identification_t *peer)
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{
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private_eap_identity_t *this = eap_identity_create(server, peer);
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/* public functions */
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this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate_peer;
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this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process_peer;
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return &this->public;
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}
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/*
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* Described in header.
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*/
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eap_identity_t *eap_identity_create_server(identification_t *server,
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identification_t *peer)
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{
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private_eap_identity_t *this = eap_identity_create(server, peer);
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/* public functions */
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this->public.eap_method_interface.initiate = (status_t(*)(eap_method_t*,eap_payload_t**))initiate_server;
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this->public.eap_method_interface.process = (status_t(*)(eap_method_t*,eap_payload_t*,eap_payload_t**))process_server;
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return &this->public;
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}
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