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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 <encoding/payloads/sa_payload.h>
typedef struct private_set_proposal_number_t private_set_proposal_number_t;
/**
* Private data of an set_proposal_number_t object.
*/
struct private_set_proposal_number_t {
/**
* Implements the hook_t interface.
*/
hook_t hook;
/**
* Alter requests or responses?
*/
bool req;
/**
* ID of message to alter.
*/
int id;
/**
* Proposal number to modify
*/
int from;
/**
* Proposal number to set
*/
int to;
};
/**
* Copy all algs from given type from one proposal to another
*/
static void copy_proposal_algs(proposal_t *from, proposal_t *to,
transform_type_t type)
{
enumerator_t *enumerator;
u_int16_t alg, key_size;
enumerator = from->create_enumerator(from, type);
while (enumerator->enumerate(enumerator, &alg, &key_size))
{
to->add_algorithm(to, type, alg, key_size);
}
enumerator->destroy(enumerator);
}
METHOD(listener_t, message, bool,
private_set_proposal_number_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;
linked_list_t *list = NULL, *updated;
sa_payload_t *sa;
proposal_t *proposal, *new;
updated = linked_list_create();
enumerator = message->create_payload_enumerator(message);
while (enumerator->enumerate(enumerator, &payload))
{
if (payload->get_type(payload) == SECURITY_ASSOCIATION)
{
sa = (sa_payload_t*)payload;
list = sa->get_proposals(sa);
message->remove_payload_at(message, enumerator);
sa->destroy(sa);
}
}
enumerator->destroy(enumerator);
if (list)
{
enumerator = list->create_enumerator(list);
while (enumerator->enumerate(enumerator, &proposal))
{
if (proposal->get_number(proposal) == this->from)
{
DBG1(DBG_CFG, "setting proposal number from %d to %d",
this->from, this->to);
new = proposal_create(proposal->get_protocol(proposal),
this->to);
copy_proposal_algs(proposal, new, ENCRYPTION_ALGORITHM);
copy_proposal_algs(proposal, new, INTEGRITY_ALGORITHM);
copy_proposal_algs(proposal, new, PSEUDO_RANDOM_FUNCTION);
copy_proposal_algs(proposal, new, DIFFIE_HELLMAN_GROUP);
copy_proposal_algs(proposal, new, EXTENDED_SEQUENCE_NUMBERS);
updated->insert_last(updated, new);
}
else
{
list->remove_at(list, enumerator);
updated->insert_last(updated, proposal);
}
}
enumerator->destroy(enumerator);
}
sa = sa_payload_create_from_proposals_v2(updated);
list->destroy_offset(list, offsetof(proposal_t, destroy));
updated->destroy_offset(updated, offsetof(proposal_t, destroy));
message->add_payload(message, (payload_t*)sa);
}
return TRUE;
}
METHOD(hook_t, destroy, void,
private_set_proposal_number_t *this)
{
free(this);
}
/**
* Create the IKE_AUTH fill hook
*/
hook_t *set_proposal_number_hook_create(char *name)
{
private_set_proposal_number_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),
.from = conftest->test->get_int(conftest->test,
"hooks.%s.from", 0, name),
.to = conftest->test->get_int(conftest->test,
"hooks.%s.to", 1, name),
);
return &this->hook;
}
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