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Moving charon to libcharon.

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This commit is contained in:
Tobias Brunner
2010-03-19 13:34:52 +01:00
parent 7c11d10eb8
commit 08c5572602
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src/libcharon/plugins/eap_md5/Makefile.am
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INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon
AM_CFLAGS = -rdynamic
if MONOLITHIC
noinst_LTLIBRARIES = libstrongswan-eap-md5.la
else
plugin_LTLIBRARIES = libstrongswan-eap-md5.la
endif
libstrongswan_eap_md5_la_SOURCES = \
eap_md5_plugin.h eap_md5_plugin.c eap_md5.h eap_md5.c
libstrongswan_eap_md5_la_LDFLAGS = -module -avoid-version
src/libcharon/plugins/eap_md5/eap_md5.c
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/*
* Copyright (C) 2007 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_md5.h"
#include <daemon.h>
#include <library.h>
#include <crypto/hashers/hasher.h>
typedef struct private_eap_md5_t private_eap_md5_t;
/**
* Private data of an eap_md5_t object.
*/
struct private_eap_md5_t {
/**
* Public authenticator_t interface.
*/
eap_md5_t public;
/**
* ID of the server
*/
identification_t *server;
/**
* ID of the peer
*/
identification_t *peer;
/**
* challenge sent by the server
*/
chunk_t challenge;
/**
* EAP message identififier
*/
u_int8_t identifier;
};
typedef struct eap_md5_header_t eap_md5_header_t;
/**
* packed eap MD5 header struct
*/
struct eap_md5_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;
/** length of value (challenge) */
u_int8_t value_size;
/** actual value */
u_int8_t value[];
} __attribute__((__packed__));
#define CHALLENGE_LEN 16
#define PAYLOAD_LEN (CHALLENGE_LEN + sizeof(eap_md5_header_t))
/**
* Hash the challenge string, create response
*/
static status_t hash_challenge(private_eap_md5_t *this, chunk_t *response,
identification_t *me, identification_t *other)
{
shared_key_t *shared;
chunk_t concat;
hasher_t *hasher;
shared = charon->credentials->get_shared(charon->credentials, SHARED_EAP,
me, other);
if (shared == NULL)
{
DBG1(DBG_IKE, "no EAP key found for hosts '%Y' - '%Y'", me, other);
return NOT_FOUND;
}
concat = chunk_cata("ccc", chunk_from_thing(this->identifier),
shared->get_key(shared), this->challenge);
shared->destroy(shared);
hasher = lib->crypto->create_hasher(lib->crypto, HASH_MD5);
if (hasher == NULL)
{
DBG1(DBG_IKE, "EAP-MD5 failed, MD5 not supported");
return FAILED;
}
hasher->allocate_hash(hasher, concat, response);
hasher->destroy(hasher);
return SUCCESS;
}
/**
* Implementation of eap_method_t.initiate for the peer
*/
static status_t initiate_peer(private_eap_md5_t *this, eap_payload_t **out)
{
/* peer never initiates */
return FAILED;
}
/**
* Implementation of eap_method_t.initiate for the server
*/
static status_t initiate_server(private_eap_md5_t *this, eap_payload_t **out)
{
rng_t *rng;
eap_md5_header_t *req;
rng = lib->crypto->create_rng(lib->crypto, RNG_WEAK);
if (!rng)
{
return FAILED;
}
rng->allocate_bytes(rng, CHALLENGE_LEN, &this->challenge);
rng->destroy(rng);
req = alloca(PAYLOAD_LEN);
req->length = htons(PAYLOAD_LEN);
req->code = EAP_REQUEST;
req->identifier = this->identifier;
req->type = EAP_MD5;
req->value_size = this->challenge.len;
memcpy(req->value, this->challenge.ptr, this->challenge.len);
*out = eap_payload_create_data(chunk_create((void*)req, PAYLOAD_LEN));
return NEED_MORE;
}
/**
* Implementation of eap_method_t.process for the peer
*/
static status_t process_peer(private_eap_md5_t *this,
eap_payload_t *in, eap_payload_t **out)
{
chunk_t response;
chunk_t data;
eap_md5_header_t *req;
this->identifier = in->get_identifier(in);
data = in->get_data(in);
this->challenge = chunk_clone(chunk_skip(data, 6));
if (data.len < 6 || this->challenge.len < *(data.ptr + 5))
{
DBG1(DBG_IKE, "received invalid EAP-MD5 message");
return FAILED;
}
if (hash_challenge(this, &response, this->peer, this->server) != SUCCESS)
{
return FAILED;
}
req = alloca(PAYLOAD_LEN);
req->length = htons(PAYLOAD_LEN);
req->code = EAP_RESPONSE;
req->identifier = this->identifier;
req->type = EAP_MD5;
req->value_size = response.len;
memcpy(req->value, response.ptr, response.len);
chunk_free(&response);
*out = eap_payload_create_data(chunk_create((void*)req, PAYLOAD_LEN));
return NEED_MORE;
}
/**
* Implementation of eap_method_t.process for the server
*/
static status_t process_server(private_eap_md5_t *this,
eap_payload_t *in, eap_payload_t **out)
{
chunk_t response, expected;
chunk_t data;
if (this->identifier != in->get_identifier(in))
{
DBG1(DBG_IKE, "received invalid EAP-MD5 message");
return FAILED;
}
if (hash_challenge(this, &expected, this->server, this->peer) != SUCCESS)
{
return FAILED;
}
data = in->get_data(in);
response = chunk_skip(data, 6);
if (response.len < expected.len ||
!memeq(response.ptr, expected.ptr, expected.len))
{
chunk_free(&expected);
DBG1(DBG_IKE, "EAP-MD5 verification failed");
return FAILED;
}
chunk_free(&expected);
return SUCCESS;
}
/**
* Implementation of eap_method_t.get_type.
*/
static eap_type_t get_type(private_eap_md5_t *this, u_int32_t *vendor)
{
*vendor = 0;
return EAP_MD5;
}
/**
* Implementation of eap_method_t.get_msk.
*/
static status_t get_msk(private_eap_md5_t *this, chunk_t *msk)
{
return FAILED;
}
/**
* Implementation of eap_method_t.is_mutual.
*/
static bool is_mutual(private_eap_md5_t *this)
{
return FALSE;
}
/**
* Implementation of eap_method_t.destroy.
*/
static void destroy(private_eap_md5_t *this)
{
this->peer->destroy(this->peer);
this->server->destroy(this->server);
chunk_free(&this->challenge);
free(this);
}
/**
* Generic constructor
*/
static private_eap_md5_t *eap_md5_create_generic(identification_t *server,
identification_t *peer)
{
private_eap_md5_t *this = malloc_thing(private_eap_md5_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;
/* private data */
this->peer = peer->clone(peer);
this->server = server->clone(server);
this->challenge = chunk_empty;
this->identifier = 0;
return this;
}
/*
* see header
*/
eap_md5_t *eap_md5_create_server(identification_t *server, identification_t *peer)
{
private_eap_md5_t *this = eap_md5_create_generic(server, peer);
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;
/* generate a non-zero identifier */
do {
this->identifier = random();
} while (!this->identifier);
return &this->public;
}
/*
* see header
*/
eap_md5_t *eap_md5_create_peer(identification_t *server, identification_t *peer)
{
private_eap_md5_t *this = eap_md5_create_generic(server, peer);
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;
}
src/libcharon/plugins/eap_md5/eap_md5.h
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/*
* Copyright (C) 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.
*/
/**
* @defgroup eap_md5_i eap_md5
* @{ @ingroup eap_md5
*/
#ifndef EAP_MD5_H_
#define EAP_MD5_H_
typedef struct eap_md5_t eap_md5_t;
#include <sa/authenticators/eap/eap_method.h>
/**
* Implementation of the eap_method_t interface using EAP-MD5 (CHAP).
*/
struct eap_md5_t {
/**
* Implemented eap_method_t interface.
*/
eap_method_t eap_method_interface;
};
/**
* Creates the EAP method EAP-MD5 acting as server.
*
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_md5_t object
*/
eap_md5_t *eap_md5_create_server(identification_t *server, identification_t *peer);
/**
* Creates the EAP method EAP-MD5 acting as peer.
*
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_md5_t object
*/
eap_md5_t *eap_md5_create_peer(identification_t *server, identification_t *peer);
#endif /** EAP_MD5_H_ @}*/
src/libcharon/plugins/eap_md5/eap_md5_plugin.c
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/*
* Copyright (C) 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_md5_plugin.h"
#include "eap_md5.h"
#include <daemon.h>
/**
* Implementation of plugin_t.destroy
*/
static void destroy(eap_md5_plugin_t *this)
{
charon->eap->remove_method(charon->eap,
(eap_constructor_t)eap_md5_create_server);
charon->eap->remove_method(charon->eap,
(eap_constructor_t)eap_md5_create_peer);
free(this);
}
/*
* see header file
*/
plugin_t *eap_md5_plugin_create()
{
eap_md5_plugin_t *this = malloc_thing(eap_md5_plugin_t);
this->plugin.destroy = (void(*)(plugin_t*))destroy;
charon->eap->add_method(charon->eap, EAP_MD5, 0, EAP_SERVER,
(eap_constructor_t)eap_md5_create_server);
charon->eap->add_method(charon->eap, EAP_MD5, 0, EAP_PEER,
(eap_constructor_t)eap_md5_create_peer);
return &this->plugin;
}
src/libcharon/plugins/eap_md5/eap_md5_plugin.h
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/*
* Copyright (C) 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.
*/
/**
* @defgroup eap_md5 eap_md5
* @ingroup cplugins
*
* @defgroup eap_md5_plugin eap_md5_plugin
* @{ @ingroup eap_md5
*/
#ifndef EAP_MD5_PLUGIN_H_
#define EAP_MD5_PLUGIN_H_
#include <plugins/plugin.h>
typedef struct eap_md5_plugin_t eap_md5_plugin_t;
/**
* EAP-MD5 plugin
*/
struct eap_md5_plugin_t {
/**
* implements plugin interface
*/
plugin_t plugin;
};
#endif /** EAP_MD5_PLUGIN_H_ @}*/