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merged EAP-MD5 into trunk

This commit is contained in:
Martin Willi 2007-12-12 14:29:10 +00:00
parent f9d80d53c3
commit 4b403e7672
5 changed files with 358 additions and 0 deletions
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9
configure.in
View File

@ -243,6 +243,15 @@ AC_ARG_ENABLE(
)
AM_CONDITIONAL(USE_EAP_IDENTITY, test x$eap_identity = xtrue)
AC_ARG_ENABLE(
[eap-md5],
AS_HELP_STRING([--enable-eap-md5],[build MD5 (CHAP) authenication module for EAP (default is NO).]),
[if test x$enableval = xyes; then
eap_md5=true
fi]
)
AM_CONDITIONAL(BUILD_EAP_MD5, test x$eap_md5 = xtrue)
AC_ARG_ENABLE(
[nat-transport],
AS_HELP_STRING([--enable-nat-transport],[enable NAT traversal with IPsec transport mode (default is NO).]),

6
src/charon/Makefile.am
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@ -128,6 +128,12 @@ if USE_EAP_SIM
libcharon_eapsim_la_LDFLAGS = -module
endif
if BUILD_EAP_MD5
eap_LTLIBRARIES += libeapmd5.la
libeapmd5_la_SOURCES = sa/authenticators/eap/eap_md5.h sa/authenticators/eap/eap_md5.c
libeapmd5_la_LDFLAGS = -module
endif
# build backends
################
backend_LTLIBRARIES =

280
src/charon/sa/authenticators/eap/eap_md5.c Normal file
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@ -0,0 +1,280 @@
/**
* @file eap_md5.c
*
* @brief Implementation of eap_md5_t.
*
*/
/*
* 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>
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)
{
chunk_t concat, secret;
hasher_t *hasher;
if (charon->credentials->get_eap_key(charon->credentials, this->server,
this->peer, &secret) != SUCCESS)
{
DBG1(DBG_IKE, "no EAP key found for hosts '%D' - '%D'",
this->server, this->peer);
return NOT_FOUND;
}
concat = chunk_cata("cmc", chunk_from_thing(this->identifier),
secret, this->challenge);
hasher = hasher_create(HASH_MD5);
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)
{
randomizer_t *randomizer;
status_t status;
eap_md5_header_t *req;
randomizer = randomizer_create();
status = randomizer->allocate_pseudo_random_bytes(randomizer, CHALLENGE_LEN,
&this->challenge);
randomizer->destroy(randomizer);
if (status != SUCCESS)
{
return FAILED;
}
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) != 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) != SUCCESS)
{
return FAILED;
}
data = in->get_data(in);
response = chunk_skip(data, 6);
if (!chunk_equals(response, expected))
{
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)
{
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)
{
chunk_free(&this->challenge);
free(this);
}
/*
* Described in header.
*/
eap_md5_t *eap_create(eap_role_t role,
identification_t *server, identification_t *peer)
{
private_eap_md5_t *this = malloc_thing(private_eap_md5_t);
/* public functions */
switch (role)
{
case EAP_SERVER:
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;
break;
case EAP_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;
break;
default:
free(this);
return NULL;
}
this->public.eap_method_interface.get_type = (eap_type_t(*)(eap_method_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;
this->server = server;
this->challenge = chunk_empty;
this->identifier = random();
return &this->public;
}

59
src/charon/sa/authenticators/eap/eap_md5.h Normal file
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@ -0,0 +1,59 @@
/**
* @file eap_md5.h
*
* @brief Interface of eap_md5_t.
*
*/
/*
* 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.
*/
#ifndef EAP_MD5_H_
#define EAP_MD5_H_
typedef struct eap_md5_t eap_md5_t;
#include <sa/authenticators/eap/eap_method.h>
/**
* @brief Implementation of the eap_method_t interface using EAP-MD5 (CHAP).
*
* @b Constructors:
* - eap_md5_create()
* - eap_client_create() using eap_method EAP_MD5
*
* @ingroup eap
*/
struct eap_md5_t {
/**
* Implemented eap_method_t interface.
*/
eap_method_t eap_method_interface;
};
/**
* @brief Creates the EAP method EAP-MD5.
*
* @param server ID of the EAP server
* @param peer ID of the EAP client
* @return eap_md5_t object
*
* @ingroup eap
*/
eap_md5_t *eap_create(eap_role_t role,
identification_t *server, identification_t *peer);
#endif /* EAP_MD5_H_ */

4
src/starter/confread.c
View File

@ -518,6 +518,10 @@ load_conn(starter_conn_t *conn, kw_list_t *kw, starter_config_t *cfg)
{
conn->eap = 18;
}
else if (streq(kw->value, "md5"))
{
conn->eap = 4;
}
else
{
conn->eap = atoi(kw->value);