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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* 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 "hook.h"
#include <errno.h>
#include <encoding/payloads/sa_payload.h>
#include <config/proposal.h>
typedef struct private_custom_proposal_t private_custom_proposal_t;
/**
* Private data of an custom_proposal_t object.
*/
struct private_custom_proposal_t {
/**
* Implements the hook_t interface.
*/
hook_t hook;
/**
* Alter requests or responses?
*/
bool req;
/**
* ID of message to alter.
*/
int id;
/**
* hook name
*/
char *name;
};
/**
* Load custom proposal configuration to proposal list
*/
static linked_list_t* load_proposals(private_custom_proposal_t *this,
protocol_id_t proto, u_int64_t spi)
{
enumerator_t *props, *algs;
char *number, *key, *value;
linked_list_t *list;
list = linked_list_create();
props = conftest->test->create_section_enumerator(conftest->test,
"hooks.%s", this->name);
while (props->enumerate(props, &number))
{
const proposal_token_t *token = NULL;
proposal_t *proposal;
u_int16_t type, alg, keysize = 0;
char *end;
proposal = proposal_create(proto, atoi(number));
proposal->set_spi(proposal, spi);
algs = conftest->test->create_key_value_enumerator(conftest->test,
"hooks.%s.%s", this->name, number);
while (algs->enumerate(algs, &key, &value))
{
errno = 0;
type = strtoul(key, &end, 10);
if (end == key || errno)
{
if (!enum_from_name(transform_type_names, key, &type))
{
DBG1(DBG_CFG, "unknown transform: '%s', skipped", key);
continue;
}
}
errno = 0;
alg = strtoul(value, &end, 10);
if (end == value || errno)
{
token = lib->proposal->get_token(lib->proposal, value);
if (!token)
{
DBG1(DBG_CFG, "unknown algorithm: '%s', skipped", value);
continue;
}
keysize = token->keysize;
alg = token->algorithm;
}
proposal->add_algorithm(proposal, type, alg, keysize);
}
algs->destroy(algs);
list->insert_last(list, proposal);
}
props->destroy(props);
return list;
}
METHOD(listener_t, message, bool,
private_custom_proposal_t *this, ike_sa_t *ike_sa, message_t *message,
bool incoming, bool plain)
{
if (!incoming && plain &&
message->get_request(message) == this->req &&
message->get_message_id(message) == this->id)
{
enumerator_t *enumerator;
payload_t *payload;
sa_payload_t *new, *old = NULL;
linked_list_t *new_props, *old_props;
proposal_t *proposal;
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == PLV2_SECURITY_ASSOCIATION)
{
old = (sa_payload_t*)payload;
message->remove_payload_at(message, enumerator);
}
}
enumerator->destroy(enumerator);
if (old)
{
old_props = old->get_proposals(old);
old->destroy(old);
enumerator = old_props->create_enumerator(old_props);
if (enumerator->enumerate(enumerator, &proposal))
{
new_props = load_proposals(this,
proposal->get_protocol(proposal),
proposal->get_spi(proposal));
DBG1(DBG_CFG, "injecting custom proposal: %#P", new_props);
new = sa_payload_create_from_proposals_v2(new_props);
message->add_payload(message, (payload_t*)new);
new_props->destroy_offset(new_props, offsetof(proposal_t, destroy));
}
enumerator->destroy(enumerator);
old_props->destroy_offset(old_props, offsetof(proposal_t, destroy));
}
}
return TRUE;
}
METHOD(hook_t, destroy, void,
private_custom_proposal_t *this)
{
free(this->name);
free(this);
}
/**
* Create the IKE_AUTH fill hook
*/
hook_t *custom_proposal_hook_create(char *name)
{
private_custom_proposal_t *this;
INIT(this,
.hook = {
.listener = {
.message = _message,
},
.destroy = _destroy,
},
.req = conftest->test->get_bool(conftest->test,
"hooks.%s.request", TRUE, name),
.id = conftest->test->get_int(conftest->test,
"hooks.%s.id", 0, name),
.name = strdup(name),
);
return &this->hook;
}
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