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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 "ha_ike.h"
typedef struct private_ha_ike_t private_ha_ike_t;
/**
* Private data of an ha_ike_t object.
*/
struct private_ha_ike_t {
/**
* Public ha_ike_t interface.
*/
ha_ike_t public;
/**
* socket we use for syncing
*/
ha_socket_t *socket;
/**
* tunnel securing sync messages
*/
ha_tunnel_t *tunnel;
};
/**
* Return condition if it is set on ike_sa
*/
static ike_condition_t copy_condition(ike_sa_t *ike_sa, ike_condition_t cond)
{
if (ike_sa->has_condition(ike_sa, cond))
{
return cond;
}
return 0;
}
/**
* Return extension if it is supported by peers IKE_SA
*/
static ike_extension_t copy_extension(ike_sa_t *ike_sa, ike_extension_t ext)
{
if (ike_sa->supports_extension(ike_sa, ext))
{
return ext;
}
return 0;
}
/**
* Implementation of listener_t.ike_keys
*/
static bool ike_keys(private_ha_ike_t *this, ike_sa_t *ike_sa,
diffie_hellman_t *dh, chunk_t nonce_i, chunk_t nonce_r,
ike_sa_t *rekey)
{
ha_message_t *m;
chunk_t secret;
proposal_t *proposal;
u_int16_t alg, len;
if (this->tunnel && this->tunnel->is_sa(this->tunnel, ike_sa))
{ /* do not sync SA between nodes */
return TRUE;
}
if (dh->get_shared_secret(dh, &secret) != SUCCESS)
{
return TRUE;
}
m = ha_message_create(HA_IKE_ADD);
m->add_attribute(m, HA_IKE_ID, ike_sa->get_id(ike_sa));
if (rekey)
{
chunk_t skd;
keymat_t *keymat;
keymat = rekey->get_keymat(rekey);
m->add_attribute(m, HA_IKE_REKEY_ID, rekey->get_id(rekey));
m->add_attribute(m, HA_ALG_OLD_PRF, keymat->get_skd(keymat, &skd));
m->add_attribute(m, HA_OLD_SKD, skd);
}
proposal = ike_sa->get_proposal(ike_sa);
if (proposal->get_algorithm(proposal, ENCRYPTION_ALGORITHM, &alg, &len))
{
m->add_attribute(m, HA_ALG_ENCR, alg);
if (len)
{
m->add_attribute(m, HA_ALG_ENCR_LEN, len);
}
}
if (proposal->get_algorithm(proposal, INTEGRITY_ALGORITHM, &alg, NULL))
{
m->add_attribute(m, HA_ALG_INTEG, alg);
}
if (proposal->get_algorithm(proposal, PSEUDO_RANDOM_FUNCTION, &alg, NULL))
{
m->add_attribute(m, HA_ALG_PRF, alg);
}
m->add_attribute(m, HA_NONCE_I, nonce_i);
m->add_attribute(m, HA_NONCE_R, nonce_r);
m->add_attribute(m, HA_SECRET, secret);
chunk_clear(&secret);
this->socket->push(this->socket, m);
return TRUE;
}
/**
* Implementation of listener_t.ike_updown
*/
static bool ike_updown(private_ha_ike_t *this, ike_sa_t *ike_sa, bool up)
{
ha_message_t *m;
if (ike_sa->get_state(ike_sa) == IKE_PASSIVE)
{ /* only sync active IKE_SAs */
return TRUE;
}
if (this->tunnel && this->tunnel->is_sa(this->tunnel, ike_sa))
{ /* do not sync SA between nodes */
return TRUE;
}
if (up)
{
iterator_t *iterator;
peer_cfg_t *peer_cfg;
u_int32_t extension, condition;
host_t *addr;
ike_sa_id_t *id;
peer_cfg = ike_sa->get_peer_cfg(ike_sa);
condition = copy_condition(ike_sa, COND_NAT_ANY)
| copy_condition(ike_sa, COND_NAT_HERE)
| copy_condition(ike_sa, COND_NAT_THERE)
| copy_condition(ike_sa, COND_NAT_FAKE)
| copy_condition(ike_sa, COND_EAP_AUTHENTICATED)
| copy_condition(ike_sa, COND_CERTREQ_SEEN)
| copy_condition(ike_sa, COND_ORIGINAL_INITIATOR);
extension = copy_extension(ike_sa, EXT_NATT)
| copy_extension(ike_sa, EXT_MOBIKE)
| copy_extension(ike_sa, EXT_HASH_AND_URL);
id = ike_sa->get_id(ike_sa);
m = ha_message_create(HA_IKE_UPDATE);
m->add_attribute(m, HA_IKE_ID, id);
m->add_attribute(m, HA_LOCAL_ID, ike_sa->get_my_id(ike_sa));
m->add_attribute(m, HA_REMOTE_ID, ike_sa->get_other_id(ike_sa));
m->add_attribute(m, HA_LOCAL_ADDR, ike_sa->get_my_host(ike_sa));
m->add_attribute(m, HA_REMOTE_ADDR, ike_sa->get_other_host(ike_sa));
m->add_attribute(m, HA_CONDITIONS, condition);
m->add_attribute(m, HA_EXTENSIONS, extension);
m->add_attribute(m, HA_CONFIG_NAME, peer_cfg->get_name(peer_cfg));
iterator = ike_sa->create_additional_address_iterator(ike_sa);
while (iterator->iterate(iterator, (void**)&addr))
{
m->add_attribute(m, HA_ADDITIONAL_ADDR, addr);
}
iterator->destroy(iterator);
}
else
{
m = ha_message_create(HA_IKE_DELETE);
m->add_attribute(m, HA_IKE_ID, ike_sa->get_id(ike_sa));
}
this->socket->push(this->socket, m);
return TRUE;
}
/**
* Implementation of listener_t.ike_rekey
*/
static bool ike_rekey(private_ha_ike_t *this, ike_sa_t *old, ike_sa_t *new)
{
ike_updown(this, old, FALSE);
ike_updown(this, new, TRUE);
return TRUE;
}
/**
* Implementation of listener_t.message
*/
static bool message_hook(private_ha_ike_t *this, ike_sa_t *ike_sa,
message_t *message, bool incoming)
{
if (this->tunnel && this->tunnel->is_sa(this->tunnel, ike_sa))
{ /* do not sync SA between nodes */
return TRUE;
}
if (message->get_exchange_type(message) != IKE_SA_INIT &&
message->get_request(message))
{ /* we sync on requests, but skip it on IKE_SA_INIT */
ha_message_t *m;
u_int32_t mid;
m = ha_message_create(HA_IKE_UPDATE);
m->add_attribute(m, HA_IKE_ID, ike_sa->get_id(ike_sa));
mid = message->get_message_id(message) + 1;
if (incoming)
{
m->add_attribute(m, HA_RESPOND_MID, mid);
}
else
{
m->add_attribute(m, HA_INITIATE_MID, mid);
}
this->socket->push(this->socket, m);
}
if (ike_sa->get_state(ike_sa) == IKE_ESTABLISHED &&
message->get_exchange_type(message) == IKE_AUTH &&
!message->get_request(message))
{ /* After IKE_SA has been established, sync peers virtual IP.
* We cannot sync it in the state_change hook, it is installed later.
* TODO: where to sync local VIP? */
ha_message_t *m;
host_t *vip;
vip = ike_sa->get_virtual_ip(ike_sa, FALSE);
if (vip)
{
m = ha_message_create(HA_IKE_UPDATE);
m->add_attribute(m, HA_IKE_ID, ike_sa->get_id(ike_sa));
m->add_attribute(m, HA_REMOTE_VIP, vip);
this->socket->push(this->socket, m);
}
}
return TRUE;
}
/**
* Implementation of ha_ike_t.destroy.
*/
static void destroy(private_ha_ike_t *this)
{
free(this);
}
/**
* See header
*/
ha_ike_t *ha_ike_create(ha_socket_t *socket, ha_tunnel_t *tunnel)
{
private_ha_ike_t *this = malloc_thing(private_ha_ike_t);
memset(&this->public.listener, 0, sizeof(listener_t));
this->public.listener.ike_keys = (bool(*)(listener_t*, ike_sa_t *ike_sa, diffie_hellman_t *dh,chunk_t nonce_i, chunk_t nonce_r, ike_sa_t *rekey))ike_keys;
this->public.listener.ike_updown = (bool(*)(listener_t*,ike_sa_t *ike_sa, bool up))ike_updown;
this->public.listener.ike_rekey = (bool(*)(listener_t*,ike_sa_t *old, ike_sa_t *new))ike_rekey;
this->public.listener.message = (bool(*)(listener_t*, ike_sa_t *, message_t *,bool))message_hook;
this->public.destroy = (void(*)(ha_ike_t*))destroy;
this->socket = socket;
this->tunnel = tunnel;
return &this->public;
}
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