524 lines
12 KiB
C
524 lines
12 KiB
C
/*
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* Copyright (C) 2007 Martin Willi
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* Copyright (C) 2006-2007 Fabian Hartmann, Noah Heusser
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* Hochschule fuer Technik Rapperswil
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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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* $Id$
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*/
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#include "ike_config.h"
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#include <daemon.h>
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#include <encoding/payloads/cp_payload.h>
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#define DNS_SERVER_MAX 2
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#define NBNS_SERVER_MAX 2
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typedef struct private_ike_config_t private_ike_config_t;
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/**
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* Private members of a ike_config_t task.
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*/
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struct private_ike_config_t {
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/**
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* Public methods and task_t interface.
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*/
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ike_config_t public;
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/**
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* Assigned IKE_SA.
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*/
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ike_sa_t *ike_sa;
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/**
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* Are we the initiator?
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*/
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bool initiator;
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/**
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* virtual ip
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*/
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host_t *virtual_ip;
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/**
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* list of DNS servers
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*/
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linked_list_t *dns;
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/**
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* list of WINS servers
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*/
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linked_list_t *nbns;
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};
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/**
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* build configuration payloads and attributes
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*/
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static void build_payloads(private_ike_config_t *this, message_t *message,
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config_type_t type)
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{
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cp_payload_t *cp;
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configuration_attribute_t *ca;
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chunk_t chunk, prefix;
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if (!this->virtual_ip)
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{
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return;
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}
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cp = cp_payload_create();
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cp->set_config_type(cp, type);
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ca = configuration_attribute_create();
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if (this->virtual_ip->get_family(this->virtual_ip) == AF_INET)
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{
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ca->set_type(ca, INTERNAL_IP4_ADDRESS);
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if (this->virtual_ip->is_anyaddr(this->virtual_ip))
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{
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chunk = chunk_empty;
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}
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else
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{
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chunk = this->virtual_ip->get_address(this->virtual_ip);
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}
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}
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else
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{
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ca->set_type(ca, INTERNAL_IP6_ADDRESS);
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if (this->virtual_ip->is_anyaddr(this->virtual_ip))
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{
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chunk = chunk_empty;
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}
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else
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{
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prefix = chunk_alloca(1);
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*prefix.ptr = 64;
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chunk = this->virtual_ip->get_address(this->virtual_ip);
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chunk = chunk_cata("cc", chunk, prefix);
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}
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}
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ca->set_value(ca, chunk);
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cp->add_configuration_attribute(cp, ca);
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/* we currently always add a DNS request if we request an IP */
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if (this->initiator)
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{
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ca = configuration_attribute_create();
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if (this->virtual_ip->get_family(this->virtual_ip) == AF_INET)
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{
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ca->set_type(ca, INTERNAL_IP4_DNS);
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}
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else
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{
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ca->set_type(ca, INTERNAL_IP6_DNS);
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}
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cp->add_configuration_attribute(cp, ca);
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}
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else
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{
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host_t *ip;
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iterator_t *iterator;
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/* Add internal DNS servers */
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iterator = this->dns->create_iterator(this->dns, TRUE);
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while (iterator->iterate(iterator, (void**)&ip))
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{
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ca = configuration_attribute_create();
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if (ip->get_family(ip) == AF_INET)
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{
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ca->set_type(ca, INTERNAL_IP4_DNS);
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}
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else
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{
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ca->set_type(ca, INTERNAL_IP6_DNS);
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}
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chunk = ip->get_address(ip);
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ca->set_value(ca, chunk);
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cp->add_configuration_attribute(cp, ca);
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}
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iterator->destroy(iterator);
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/* Add internal WINS servers */
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iterator = this->nbns->create_iterator(this->nbns, TRUE);
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while (iterator->iterate(iterator, (void**)&ip))
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{
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ca = configuration_attribute_create();
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if (ip->get_family(ip) == AF_INET)
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{
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ca->set_type(ca, INTERNAL_IP4_NBNS);
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}
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else
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{
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ca->set_type(ca, INTERNAL_IP6_NBNS);
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}
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chunk = ip->get_address(ip);
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ca->set_value(ca, chunk);
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cp->add_configuration_attribute(cp, ca);
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}
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iterator->destroy(iterator);
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}
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message->add_payload(message, (payload_t*)cp);
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}
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/**
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* process a single configuration attribute
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*/
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static void process_attribute(private_ike_config_t *this,
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configuration_attribute_t *ca)
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{
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host_t *ip;
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chunk_t addr;
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int family = AF_INET6;
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switch (ca->get_type(ca))
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{
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case INTERNAL_IP4_ADDRESS:
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family = AF_INET;
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/* fall */
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case INTERNAL_IP6_ADDRESS:
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{
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addr = ca->get_value(ca);
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if (addr.len == 0)
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{
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ip = host_create_any(family);
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}
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else
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{
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/* skip prefix byte in IPv6 payload*/
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if (family == AF_INET6)
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{
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addr.len--;
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}
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ip = host_create_from_chunk(family, addr, 0);
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}
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if (ip && !this->virtual_ip)
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{
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this->virtual_ip = ip;
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}
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break;
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}
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case INTERNAL_IP4_DNS:
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family = AF_INET;
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/* fall */
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case INTERNAL_IP6_DNS:
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{
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addr = ca->get_value(ca);
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if (addr.len == 0)
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{
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ip = host_create_any(family);
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}
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else
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{
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ip = host_create_from_chunk(family, addr, 0);
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}
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if (ip)
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{
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this->dns->insert_last(this->dns, ip);
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}
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break;
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}
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case INTERNAL_IP4_NBNS:
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case INTERNAL_IP6_NBNS:
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{
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addr = ca->get_value(ca);
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if (addr.len == 0)
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{
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ip = host_create_any(family);
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}
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else
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{
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ip = host_create_from_chunk(family, addr, 0);
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}
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if (ip)
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{
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this->nbns->insert_last(this->nbns, ip);
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}
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break;
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}
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default:
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DBG1(DBG_IKE, "ignoring %N config attribute",
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configuration_attribute_type_names,
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ca->get_type(ca));
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break;
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}
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}
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/**
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* Scan for configuration payloads and attributes
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*/
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static void process_payloads(private_ike_config_t *this, message_t *message)
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{
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enumerator_t *enumerator;
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iterator_t *attributes;
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payload_t *payload;
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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) == CONFIGURATION)
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{
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cp_payload_t *cp = (cp_payload_t*)payload;
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configuration_attribute_t *ca;
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switch (cp->get_config_type(cp))
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{
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case CFG_REQUEST:
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case CFG_REPLY:
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{
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attributes = cp->create_attribute_iterator(cp);
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while (attributes->iterate(attributes, (void**)&ca))
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{
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process_attribute(this, ca);
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}
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attributes->destroy(attributes);
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break;
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}
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default:
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DBG1(DBG_IKE, "ignoring %N config payload",
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config_type_names, cp->get_config_type(cp));
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break;
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}
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}
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}
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enumerator->destroy(enumerator);
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t build_i(private_ike_config_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* in first IKE_AUTH only */
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peer_cfg_t *config;
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host_t *vip;
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/* reuse virtual IP if we already have one */
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vip = this->ike_sa->get_virtual_ip(this->ike_sa, TRUE);
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if (!vip)
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{
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config = this->ike_sa->get_peer_cfg(this->ike_sa);
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vip = config->get_virtual_ip(config);
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}
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if (vip)
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{
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this->virtual_ip = vip->clone(vip);
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}
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build_payloads(this, message, CFG_REQUEST);
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for responder
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*/
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static status_t process_r(private_ike_config_t *this, message_t *message)
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{
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if (message->get_message_id(message) == 1)
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{ /* in first IKE_AUTH only */
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process_payloads(this, message);
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.build for responder
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*/
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static status_t build_r(private_ike_config_t *this, message_t *message)
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{
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if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
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{ /* in last IKE_AUTH exchange */
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peer_cfg_t *config = this->ike_sa->get_peer_cfg(this->ike_sa);
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if (config && this->virtual_ip)
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{
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host_t *ip = NULL;
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DBG1(DBG_IKE, "peer requested virtual IP %H", this->virtual_ip);
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if (config->get_pool(config))
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{
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ip = charon->attributes->acquire_address(charon->attributes,
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config->get_pool(config),
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this->ike_sa->get_other_id(this->ike_sa),
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this->virtual_ip);
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}
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if (ip == NULL)
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{
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DBG1(DBG_IKE, "no virtual IP found, sending %N",
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notify_type_names, INTERNAL_ADDRESS_FAILURE);
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message->add_notify(message, FALSE, INTERNAL_ADDRESS_FAILURE,
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chunk_empty);
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return SUCCESS;
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}
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DBG1(DBG_IKE, "assigning virtual IP %H to peer", ip);
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this->ike_sa->set_virtual_ip(this->ike_sa, FALSE, ip);
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this->virtual_ip->destroy(this->virtual_ip);
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this->virtual_ip = ip;
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build_payloads(this, message, CFG_REPLY);
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}
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return SUCCESS;
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.process for initiator
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*/
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static status_t process_i(private_ike_config_t *this, message_t *message)
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{
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if (this->ike_sa->get_state(this->ike_sa) == IKE_ESTABLISHED)
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{ /* in last IKE_AUTH exchange */
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host_t *ip;
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peer_cfg_t *config;
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DESTROY_IF(this->virtual_ip);
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this->virtual_ip = NULL;
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process_payloads(this, message);
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if (this->virtual_ip == NULL)
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{ /* force a configured virtual IP, even if server didn't return one */
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config = this->ike_sa->get_peer_cfg(this->ike_sa);
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this->virtual_ip = config->get_virtual_ip(config);
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if (this->virtual_ip)
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{
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this->virtual_ip = this->virtual_ip->clone(this->virtual_ip);
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}
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}
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if (this->virtual_ip && !this->virtual_ip->is_anyaddr(this->virtual_ip))
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{
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this->ike_sa->set_virtual_ip(this->ike_sa, TRUE, this->virtual_ip);
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while (this->dns->remove_last(this->dns, (void**)&ip) == SUCCESS)
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{
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if (!ip->is_anyaddr(ip))
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{
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this->ike_sa->add_dns_server(this->ike_sa, ip);
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}
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ip->destroy(ip);
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}
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}
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return SUCCESS;
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}
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return NEED_MORE;
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}
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/**
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* Implementation of task_t.get_type
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*/
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static task_type_t get_type(private_ike_config_t *this)
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{
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return IKE_CONFIG;
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}
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/**
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* Implementation of task_t.migrate
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*/
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static void migrate(private_ike_config_t *this, ike_sa_t *ike_sa)
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{
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DESTROY_IF(this->virtual_ip);
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this->dns->destroy_offset(this->dns, offsetof(host_t, destroy));
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this->ike_sa = ike_sa;
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this->virtual_ip = NULL;
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this->dns = linked_list_create();
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}
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/**
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* Implementation of task_t.destroy
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*/
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static void destroy(private_ike_config_t *this)
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{
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DESTROY_IF(this->virtual_ip);
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this->dns->destroy_offset(this->dns, offsetof(host_t, destroy));
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this->nbns->destroy_offset(this->nbns, offsetof(host_t, destroy));
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free(this);
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}
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/*
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* Described in header.
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*/
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ike_config_t *ike_config_create(ike_sa_t *ike_sa, bool initiator)
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{
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private_ike_config_t *this = malloc_thing(private_ike_config_t);
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this->public.task.get_type = (task_type_t(*)(task_t*))get_type;
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this->public.task.migrate = (void(*)(task_t*,ike_sa_t*))migrate;
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this->public.task.destroy = (void(*)(task_t*))destroy;
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this->initiator = initiator;
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this->ike_sa = ike_sa;
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this->virtual_ip = NULL;
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this->dns = linked_list_create();
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this->nbns = linked_list_create();
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if (initiator)
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{
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_i;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_i;
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}
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else
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{
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int i;
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/* assign DNS servers */
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for (i = 1; i <= DNS_SERVER_MAX; i++)
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{
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char dns_key[16], *dns_str;
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snprintf(dns_key, sizeof(dns_key), "charon.dns%d", i);
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dns_str = lib->settings->get_str(lib->settings, dns_key, NULL);
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if (dns_str)
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{
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host_t *dns = host_create_from_string(dns_str, 0);
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if (dns)
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{
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DBG2(DBG_CFG, "assigning DNS server %H to peer", dns);
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this->dns->insert_last(this->dns, dns);
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}
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}
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}
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/* assign WINS servers */
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for (i = 1; i <= NBNS_SERVER_MAX; i++)
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{
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char nbns_key[16], *nbns_str;
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snprintf(nbns_key, sizeof(nbns_key), "charon.nbns%d", i);
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nbns_str = lib->settings->get_str(lib->settings, nbns_key, NULL);
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if (nbns_str)
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{
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host_t *nbns = host_create_from_string(nbns_str, 0);
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if (nbns)
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{
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DBG2(DBG_CFG, "assigning NBNS server %H to peer", nbns);
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this->nbns->insert_last(this->nbns, nbns);
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}
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}
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}
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this->public.task.build = (status_t(*)(task_t*,message_t*))build_r;
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this->public.task.process = (status_t(*)(task_t*,message_t*))process_r;
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}
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return &this->public;
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}
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