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/*
* Copyrigth (C) 2012 Reto Buerki
* Copyright (C) 2012 Adrian-Ken Rueegsegger
* 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 <tkm/client.h>
#include <tkm/constants.h>
#include "tkm.h"
#include "tkm_utils.h"
#include "tkm_diffie_hellman.h"
#include <daemon.h>
#include <collections/hashtable.h>
typedef struct private_tkm_diffie_hellman_t private_tkm_diffie_hellman_t;
static hashtable_t *group_map = NULL;
/**
* Private data of a tkm_diffie_hellman_t object.
*/
struct private_tkm_diffie_hellman_t {
/**
* Public tkm_diffie_hellman_t interface.
*/
tkm_diffie_hellman_t public;
/**
* Diffie Hellman group number.
*/
u_int16_t group;
/**
* Diffie Hellman public value.
*/
dh_pubvalue_type pubvalue;
/**
* Context id.
*/
dh_id_type context_id;
};
METHOD(diffie_hellman_t, get_my_public_value, void,
private_tkm_diffie_hellman_t *this, chunk_t *value)
{
sequence_to_chunk(this->pubvalue.data, this->pubvalue.size, value);
}
METHOD(diffie_hellman_t, get_shared_secret, status_t,
private_tkm_diffie_hellman_t *this, chunk_t *secret)
{
*secret = chunk_empty;
return SUCCESS;
}
METHOD(diffie_hellman_t, set_other_public_value, void,
private_tkm_diffie_hellman_t *this, chunk_t value)
{
// TODO: unvoid this function
dh_pubvalue_type othervalue;
othervalue.size = value.len;
memcpy(&othervalue.data, value.ptr, value.len);
ike_dh_generate_key(this->context_id, othervalue);
}
METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t,
private_tkm_diffie_hellman_t *this)
{
return this->group;
}
METHOD(diffie_hellman_t, destroy, void,
private_tkm_diffie_hellman_t *this)
{
if (ike_dh_reset(this->context_id) != TKM_OK)
{
DBG1(DBG_LIB, "failed to reset DH context %d", this->context_id);
}
tkm->idmgr->release_id(tkm->idmgr, TKM_CTX_DH, this->context_id);
free(this);
}
METHOD(tkm_diffie_hellman_t, get_id, dh_id_type,
private_tkm_diffie_hellman_t *this)
{
return this->context_id;
}
static u_int hash(void *key)
{
diffie_hellman_group_t k = *(diffie_hellman_group_t*)key;
return chunk_hash(chunk_from_thing(k));
}
static bool equals(void *key, void *other_key)
{
return *(diffie_hellman_group_t*)key == *(diffie_hellman_group_t*)other_key;
}
/*
* Described in header.
*/
int register_dh_mapping()
{
int count, i;
char *iana_id_str, *tkm_id_str;
diffie_hellman_group_t *iana_id;
u_int64_t *tkm_id;
hashtable_t *map;
enumerator_t *enumerator;
map = hashtable_create((hashtable_hash_t)hash,
(hashtable_equals_t)equals, 16);
enumerator = lib->settings->create_key_value_enumerator(lib->settings,
"%s.dh_mapping",
lib->ns);
while (enumerator->enumerate(enumerator, &iana_id_str, &tkm_id_str))
{
iana_id = malloc_thing(diffie_hellman_group_t);
*iana_id = settings_value_as_int(iana_id_str, 0);
tkm_id = malloc_thing(u_int64_t);
*tkm_id = settings_value_as_int(tkm_id_str, 0);
map->put(map, iana_id, tkm_id);
}
enumerator->destroy(enumerator);
count = map->get_count(map);
plugin_feature_t f[count + 1];
f[0] = PLUGIN_REGISTER(DH, tkm_diffie_hellman_create);
i = 1;
enumerator = map->create_enumerator(map);
while (enumerator->enumerate(enumerator, &iana_id, &tkm_id))
{
f[i] = PLUGIN_PROVIDE(DH, *iana_id);
i++;
}
enumerator->destroy(enumerator);
lib->plugins->add_static_features(lib->plugins, "tkm-dh", f, countof(f),
TRUE, NULL, NULL);
if (count > 0)
{
group_map = map;
}
else
{
map->destroy(map);
}
return count;
}
/*
* Described in header.
*/
void destroy_dh_mapping()
{
enumerator_t *enumerator;
char *key, *value;
if (group_map)
{
enumerator = group_map->create_enumerator(group_map);
while (enumerator->enumerate(enumerator, &key, &value))
{
free(key);
free(value);
}
enumerator->destroy(enumerator);
group_map->destroy(group_map);
}
}
/*
* Described in header.
*/
tkm_diffie_hellman_t *tkm_diffie_hellman_create(diffie_hellman_group_t group)
{
private_tkm_diffie_hellman_t *this;
if (!group_map)
{
return NULL;
}
INIT(this,
.public = {
.dh = {
.get_shared_secret = _get_shared_secret,
.set_other_public_value = _set_other_public_value,
.get_my_public_value = _get_my_public_value,
.get_dh_group = _get_dh_group,
.destroy = _destroy,
},
.get_id = _get_id,
},
.group = group,
.context_id = tkm->idmgr->acquire_id(tkm->idmgr, TKM_CTX_DH),
);
if (!this->context_id)
{
free(this);
return NULL;
}
u_int64_t *dha_id = group_map->get(group_map, &group);
if (!dha_id)
{
free(this);
return NULL;
}
if (ike_dh_create(this->context_id, *dha_id, &this->pubvalue) != TKM_OK)
{
free(this);
return NULL;
}
return &this->public;
}
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