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#!/bin/sh
# NAT updown script
#
# Copyright (C) 2010 Andreas Steffen <andreas.steffen@strongswan.org>
#
# 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.
# PLUTO_VERSION
# indicates what version of this interface is being
# used. This document describes version 1.1. This
# is upwardly compatible with version 1.0.
#
# PLUTO_VERB
# specifies the name of the operation to be performed
# (prepare-host, prepare-client, up-host, up-client,
# down-host, or down-client). If the address family
# for security gateway to security gateway communica-
# tions is IPv6, then a suffix of -v6 is added to the
# verb.
#
# PLUTO_CONNECTION
# is the name of the connection for which we are
# routing.
#
# PLUTO_INTERFACE
# is the name of the ipsec interface to be used.
#
# PLUTO_REQID
# is the requid of the AH|ESP policy
#
# PLUTO_PROTO
# is the negotiated IPsec protocol, ah|esp
#
# PLUTO_IPCOMP
# is not empty if IPComp was negotiated
#
# PLUTO_UNIQUEID
# is the unique identifier of the associated IKE_SA
#
# PLUTO_ME
# is the IP address of our host.
#
# PLUTO_MY_ID
# is the ID of our host.
#
# PLUTO_MY_CLIENT
# is the IP address / count of our client subnet. If
# the client is just the host, this will be the
# host's own IP address / max (where max is 32 for
# IPv4 and 128 for IPv6).
#
# PLUTO_MY_SOURCEIP
# PLUTO_MY_SOURCEIP4_$i
# PLUTO_MY_SOURCEIP6_$i
# contains IPv4/IPv6 virtual IP received from a responder,
# $i enumerates from 1 to the number of IP per address family.
# PLUTO_MY_SOURCEIP is a legacy variable and equals to the first
# virtual IP, IPv4 or IPv6.
#
# PLUTO_MY_PROTOCOL
# is the IP protocol that will be transported.
#
# PLUTO_MY_PORT
# is the UDP/TCP port to which the IPsec SA is
# restricted on our side. For ICMP/ICMPv6 this contains the
# message type, and PLUTO_PEER_PORT the message code.
#
# PLUTO_PEER
# is the IP address of our peer.
#
# PLUTO_PEER_ID
# is the ID of our peer.
#
# PLUTO_PEER_CLIENT
# is the IP address / count of the peer's client sub-
# net. If the client is just the peer, this will be
# the peer's own IP address / max (where max is 32
# for IPv4 and 128 for IPv6).
#
# PLUTO_PEER_PROTOCOL
# is the IP protocol that will be transported.
#
# PLUTO_PEER_PORT
# is the UDP/TCP port to which the IPsec SA is
# restricted on the peer side. For ICMP/ICMPv6 this contains the
# message code, and PLUTO_MY_PORT the message type.
#
# PLUTO_XAUTH_ID
# is an optional user ID employed by the XAUTH protocol
#
# PLUTO_MARK_IN
# is an optional XFRM mark set on the inbound IPsec SA
#
# PLUTO_MARK_OUT
# is an optional XFRM mark set on the outbound IPsec SA
#
# PLUTO_UDP_ENC
# contains the remote UDP port in the case of ESP_IN_UDP
# encapsulation
#
# PLUTO_DNS4_$i
# PLUTO_DNS6_$i
# contains IPv4/IPv6 DNS server attribute received from a
# responder, $i enumerates from 1 to the number of servers per
# address family.
#
# define a minimum PATH environment in case it is not set
PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin"
export PATH
# resolve octal escape sequences
PLUTO_MY_ID=`printf "$PLUTO_MY_ID"`
PLUTO_PEER_ID=`printf "$PLUTO_PEER_ID"`
case "$PLUTO_VERB:$1" in
up-host:)
# connection to me coming up
# If you are doing a custom version, firewall commands go here.
;;
down-host:)
# connection to me going down
# If you are doing a custom version, firewall commands go here.
;;
up-client:)
# connection to my client subnet coming up
# If you are doing a custom version, firewall commands go here.
iptables -A FORWARD -i eth1 -o $PLUTO_INTERFACE -s PH_IP_ALICE \
-d $PLUTO_PEER_CLIENT -j ACCEPT
iptables -A FORWARD -o eth1 -i $PLUTO_INTERFACE -d PH_IP_ALICE \
-s $PLUTO_PEER_CLIENT -j ACCEPT
iptables -t nat -A POSTROUTING -o $PLUTO_INTERFACE -s PH_IP_ALICE \
-d $PLUTO_PEER_CLIENT -j SNAT --to-source $PLUTO_MY_SOURCEIP
echo "inserted NAT rule mapping PH_IP_ALICE to virtual IP $PLUTO_MY_SOURCEIP" >&2
;;
down-client:)
# connection to my client subnet going down
# If you are doing a custom version, firewall commands go here.
iptables -D FORWARD -i eth1 -o $PLUTO_INTERFACE -s PH_IP_ALICE \
-d $PLUTO_PEER_CLIENT -j ACCEPT
iptables -D FORWARD -o eth1 -i $PLUTO_INTERFACE -d PH_IP_ALICE \
-s $PLUTO_PEER_CLIENT -j ACCEPT
iptables -t nat -D POSTROUTING -o $PLUTO_INTERFACE -s PH_IP_ALICE \
-d $PLUTO_PEER_CLIENT -j SNAT --to-source $PLUTO_MY_SOURCEIP
echo "deleted NAT rule mapping PH_IP_ALICE to virtual IP $PLUTO_MY_SOURCEIP" >&2
;;
*) echo "$0: unknown verb \`$PLUTO_VERB' or parameter \`$1'" >&2
exit 1
;;
esac
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