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/*
* Copyright (C) 2015 Tobias Brunner
* 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 "redirect_manager.h"
#include <collections/linked_list.h>
#include <threading/rwlock.h>
#include <bio/bio_reader.h>
#include <bio/bio_writer.h>
typedef struct private_redirect_manager_t private_redirect_manager_t;
/**
* Private data
*/
struct private_redirect_manager_t {
/**
* Public interface
*/
redirect_manager_t public;
/**
* Registered providers
*/
linked_list_t *providers;
/**
* Lock to access list of providers
*/
rwlock_t *lock;
};
/**
* Gateway identify types
*
* The encoding is the same as that for corresponding ID payloads.
*/
typedef enum {
/** IPv4 address of the VPN gateway */
GATEWAY_ID_TYPE_IPV4 = 1,
/** IPv6 address of the VPN gateway */
GATEWAY_ID_TYPE_IPV6 = 2,
/** FQDN of the VPN gateway */
GATEWAY_ID_TYPE_FQDN = 3,
} gateway_id_type_t;
/**
* Mapping of gateway identity types to identity types
*/
static id_type_t gateway_to_id_type(gateway_id_type_t type)
{
switch (type)
{
case GATEWAY_ID_TYPE_IPV4:
return ID_IPV4_ADDR;
case GATEWAY_ID_TYPE_IPV6:
return ID_IPV6_ADDR;
case GATEWAY_ID_TYPE_FQDN:
return ID_FQDN;
default:
return 0;
}
}
/**
* Mapping of identity types to gateway identity types
*/
static gateway_id_type_t id_type_to_gateway(id_type_t type)
{
switch (type)
{
case ID_IPV4_ADDR:
return GATEWAY_ID_TYPE_IPV4;
case ID_IPV6_ADDR:
return GATEWAY_ID_TYPE_IPV6;
case ID_FQDN:
return GATEWAY_ID_TYPE_FQDN;
default:
return 0;
}
}
METHOD(redirect_manager_t, add_provider, void,
private_redirect_manager_t *this, redirect_provider_t *provider)
{
this->lock->write_lock(this->lock);
this->providers->insert_last(this->providers, provider);
this->lock->unlock(this->lock);
}
METHOD(redirect_manager_t, remove_provider, void,
private_redirect_manager_t *this, redirect_provider_t *provider)
{
this->lock->write_lock(this->lock);
this->providers->remove(this->providers, provider, NULL);
this->lock->unlock(this->lock);
}
/**
* Determine whether a client should be redirected using the callback with the
* given offset into the redirect_provider_t interface.
*/
static bool should_redirect(private_redirect_manager_t *this, ike_sa_t *ike_sa,
identification_t **gateway, size_t offset)
{
enumerator_t *enumerator;
void *provider;
bool redirect = FALSE;
this->lock->read_lock(this->lock);
enumerator = this->providers->create_enumerator(this->providers);
while (enumerator->enumerate(enumerator, &provider))
{
bool (**method)(void*,ike_sa_t*,identification_t**) = provider + offset;
if (*method && (*method)(provider, ike_sa, gateway))
{
if (*gateway && id_type_to_gateway((*gateway)->get_type(*gateway)))
{
redirect = TRUE;
break;
}
else
{
DBG1(DBG_CFG, "redirect provider returned invalid gateway ID");
DESTROY_IF(*gateway);
}
}
}
enumerator->destroy(enumerator);
this->lock->unlock(this->lock);
return redirect;
}
METHOD(redirect_manager_t, redirect_on_init, bool,
private_redirect_manager_t *this, ike_sa_t *ike_sa,
identification_t **gateway)
{
return should_redirect(this, ike_sa, gateway,
offsetof(redirect_provider_t, redirect_on_init));
}
METHOD(redirect_manager_t, redirect_on_auth, bool,
private_redirect_manager_t *this, ike_sa_t *ike_sa,
identification_t **gateway)
{
return should_redirect(this, ike_sa, gateway,
offsetof(redirect_provider_t, redirect_on_auth));
}
METHOD(redirect_manager_t, destroy, void,
private_redirect_manager_t *this)
{
this->providers->destroy(this->providers);
this->lock->destroy(this->lock);
free(this);
}
/*
* Described in header
*/
redirect_manager_t *redirect_manager_create()
{
private_redirect_manager_t *this;
INIT(this,
.public = {
.add_provider = _add_provider,
.remove_provider = _remove_provider,
.redirect_on_init = _redirect_on_init,
.redirect_on_auth = _redirect_on_auth,
.destroy = _destroy,
},
.providers = linked_list_create(),
.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
);
return &this->public;
}
/*
* Encoding of a REDIRECT or REDIRECTED_FROM notify
*
1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Next Payload |C| RESERVED | Payload Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Protocol ID(=0)| SPI Size (=0) | Notify Message Type |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| GW Ident Type | GW Ident Len | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ~
~ New Responder GW Identity ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Nonce Data ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/*
* Described in header
*/
chunk_t redirect_data_create(identification_t *gw, chunk_t nonce)
{
gateway_id_type_t type;
bio_writer_t *writer;
chunk_t data;
type = id_type_to_gateway(gw->get_type(gw));
if (!type)
{
return chunk_empty;
}
writer = bio_writer_create(0);
writer->write_uint8(writer, type);
writer->write_data8(writer, gw->get_encoding(gw));
if (nonce.ptr)
{
writer->write_data(writer, nonce);
}
data = writer->extract_buf(writer);
writer->destroy(writer);
return data;
}
/*
* Described in header
*/
identification_t *redirect_data_parse(chunk_t data, chunk_t *nonce)
{
bio_reader_t *reader;
id_type_t id_type;
chunk_t gateway;
uint8_t type;
reader = bio_reader_create(data);
if (!reader->read_uint8(reader, &type) ||
!reader->read_data8(reader, &gateway))
{
DBG1(DBG_ENC, "invalid REDIRECT notify data");
reader->destroy(reader);
return NULL;
}
id_type = gateway_to_id_type(type);
if (!id_type)
{
DBG1(DBG_ENC, "invalid gateway ID type (%d) in REDIRECT notify", type);
reader->destroy(reader);
return NULL;
}
if (nonce)
{
*nonce = chunk_clone(reader->peek(reader));
}
reader->destroy(reader);
return identification_create_from_encoding(id_type, gateway);
}
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