164 lines
4.1 KiB
C
164 lines
4.1 KiB
C
/*
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* Copyright (C) 2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "hook.h"
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#include <encoding/payloads/sa_payload.h>
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typedef struct private_set_proposal_number_t private_set_proposal_number_t;
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/**
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* Private data of an set_proposal_number_t object.
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*/
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struct private_set_proposal_number_t {
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/**
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* Implements the hook_t interface.
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*/
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hook_t hook;
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/**
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* Alter requests or responses?
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*/
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bool req;
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/**
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* ID of message to alter.
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*/
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int id;
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/**
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* Proposal number to modify
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*/
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int from;
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/**
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* Proposal number to set
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*/
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int to;
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};
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/**
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* Copy all algs from given type from one proposal to another
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*/
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static void copy_proposal_algs(proposal_t *from, proposal_t *to,
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transform_type_t type)
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{
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enumerator_t *enumerator;
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uint16_t alg, key_size;
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enumerator = from->create_enumerator(from, type);
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while (enumerator->enumerate(enumerator, &alg, &key_size))
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{
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to->add_algorithm(to, type, alg, key_size);
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}
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enumerator->destroy(enumerator);
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}
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METHOD(listener_t, message, bool,
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private_set_proposal_number_t *this, ike_sa_t *ike_sa, message_t *message,
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bool incoming, bool plain)
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{
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if (!incoming && plain &&
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message->get_request(message) == this->req &&
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message->get_message_id(message) == this->id)
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{
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enumerator_t *enumerator;
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payload_t *payload;
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linked_list_t *list = NULL, *updated;
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sa_payload_t *sa;
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proposal_t *proposal, *new;
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updated = linked_list_create();
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enumerator = message->create_payload_enumerator(message);
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while (enumerator->enumerate(enumerator, &payload))
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{
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if (payload->get_type(payload) == PLV2_SECURITY_ASSOCIATION)
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{
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sa = (sa_payload_t*)payload;
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list = sa->get_proposals(sa);
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message->remove_payload_at(message, enumerator);
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sa->destroy(sa);
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}
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}
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enumerator->destroy(enumerator);
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if (list)
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{
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enumerator = list->create_enumerator(list);
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while (enumerator->enumerate(enumerator, &proposal))
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{
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if (proposal->get_number(proposal) == this->from)
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{
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DBG1(DBG_CFG, "setting proposal number from %d to %d",
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this->from, this->to);
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new = proposal_create(proposal->get_protocol(proposal),
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this->to);
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copy_proposal_algs(proposal, new, ENCRYPTION_ALGORITHM);
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copy_proposal_algs(proposal, new, INTEGRITY_ALGORITHM);
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copy_proposal_algs(proposal, new, PSEUDO_RANDOM_FUNCTION);
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copy_proposal_algs(proposal, new, DIFFIE_HELLMAN_GROUP);
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copy_proposal_algs(proposal, new, EXTENDED_SEQUENCE_NUMBERS);
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updated->insert_last(updated, new);
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}
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else
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{
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list->remove_at(list, enumerator);
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updated->insert_last(updated, proposal);
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}
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}
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enumerator->destroy(enumerator);
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}
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sa = sa_payload_create_from_proposals_v2(updated);
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list->destroy_offset(list, offsetof(proposal_t, destroy));
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updated->destroy_offset(updated, offsetof(proposal_t, destroy));
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message->add_payload(message, (payload_t*)sa);
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}
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return TRUE;
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}
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METHOD(hook_t, destroy, void,
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private_set_proposal_number_t *this)
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{
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free(this);
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}
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/**
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* Create the IKE_AUTH fill hook
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*/
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hook_t *set_proposal_number_hook_create(char *name)
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{
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private_set_proposal_number_t *this;
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INIT(this,
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.hook = {
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.listener = {
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.message = _message,
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},
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.destroy = _destroy,
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},
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.req = conftest->test->get_bool(conftest->test,
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"hooks.%s.request", TRUE, name),
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.id = conftest->test->get_int(conftest->test,
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"hooks.%s.id", 0, name),
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.from = conftest->test->get_int(conftest->test,
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"hooks.%s.from", 0, name),
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.to = conftest->test->get_int(conftest->test,
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"hooks.%s.to", 1, name),
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);
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return &this->hook;
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}
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