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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
* Copyright (C) 2009 Andreas Steffen
* 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 "addrblock_narrow.h"
#include <daemon.h>
#include <credentials/certificates/x509.h>
typedef struct private_addrblock_narrow_t private_addrblock_narrow_t;
/**
* Private data of an addrblock_narrow_t object.
*/
struct private_addrblock_narrow_t {
/**
* Public addrblock_narrow_t interface.
*/
addrblock_narrow_t public;
};
/**
* Check if the negotiated TS list is acceptable by X509 ipAddrBlock constraints
*/
static bool check_constraints(ike_sa_t *ike_sa, linked_list_t *list)
{
auth_cfg_t *auth;
enumerator_t *auth_enum;
certificate_t *cert = NULL;
auth_enum = ike_sa->create_auth_cfg_enumerator(ike_sa, FALSE);
while (auth_enum->enumerate(auth_enum, &auth))
{
cert = auth->get(auth, AUTH_HELPER_SUBJECT_CERT);
if (cert)
{
break;
}
}
auth_enum->destroy(auth_enum);
if (cert && cert->get_type(cert) == CERT_X509)
{
x509_t *x509 = (x509_t*)cert;
if (x509->get_flags(x509) & X509_IP_ADDR_BLOCKS)
{
enumerator_t *enumerator, *block_enum;
traffic_selector_t *ts, *block_ts;
DBG1(DBG_IKE, "checking certificate-based traffic selector "
"constraints [RFC 3779]");
enumerator = list->create_enumerator(list);
while (enumerator->enumerate(enumerator, &ts))
{
bool contained = FALSE;
block_enum = x509->create_ipAddrBlock_enumerator(x509);
while (block_enum->enumerate(block_enum, &block_ts))
{
if (ts->is_contained_in(ts, block_ts))
{
DBG1(DBG_IKE, " TS %R is contained in address block"
" constraint %R", ts, block_ts);
contained = TRUE;
break;
}
}
block_enum->destroy(block_enum);
if (!contained)
{
DBG1(DBG_IKE, " TS %R is not contained in any"
" address block constraint", ts);
enumerator->destroy(enumerator);
return FALSE;
}
}
enumerator->destroy(enumerator);
}
}
return TRUE;
}
/**
* Delete all traffic selectors in a list
*/
static void flush_ts_list(linked_list_t *list)
{
traffic_selector_t *ts;
while (list->remove_last(list, (void**)&ts) == SUCCESS)
{
ts->destroy(ts);
}
}
METHOD(listener_t, narrow, bool,
private_addrblock_narrow_t *this, ike_sa_t *ike_sa, child_sa_t *child_sa,
narrow_hook_t type, linked_list_t *local, linked_list_t *remote)
{
switch (type)
{
case NARROW_RESPONDER:
case NARROW_INITIATOR_POST_AUTH:
case NARROW_INITIATOR_POST_NOAUTH:
if (!check_constraints(ike_sa, remote))
{
flush_ts_list(local);
flush_ts_list(remote);
}
break;
default:
break;
}
return TRUE;
}
METHOD(addrblock_narrow_t, destroy, void,
private_addrblock_narrow_t *this)
{
free(this);
}
/**
* See header
*/
addrblock_narrow_t *addrblock_narrow_create()
{
private_addrblock_narrow_t *this;
INIT(this,
.public = {
.listener.narrow = _narrow,
.destroy = _destroy,
},
);
return &this->public;
}
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