173 lines
6.2 KiB
Bash
Executable File
173 lines
6.2 KiB
Bash
Executable File
#!/bin/sh
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# NAT updown script
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#
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# Copyright (C) 2010 Andreas Steffen <andreas.steffen@strongswan.org>
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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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# PLUTO_VERSION
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# indicates what version of this interface is being
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# used. This document describes version 1.1. This
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# is upwardly compatible with version 1.0.
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#
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# PLUTO_VERB
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# specifies the name of the operation to be performed
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# (prepare-host, prepare-client, up-host, up-client,
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# down-host, or down-client). If the address family
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# for security gateway to security gateway communica-
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# tions is IPv6, then a suffix of -v6 is added to the
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# verb.
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#
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# PLUTO_CONNECTION
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# is the name of the connection for which we are
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# routing.
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#
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# PLUTO_INTERFACE
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# is the name of the ipsec interface to be used.
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#
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# PLUTO_REQID
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# is the requid of the AH|ESP policy
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#
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# PLUTO_PROTO
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# is the negotiated IPsec protocol, ah|esp
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#
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# PLUTO_IPCOMP
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# is not empty if IPComp was negotiated
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#
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# PLUTO_UNIQUEID
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# is the unique identifier of the associated IKE_SA
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#
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# PLUTO_ME
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# is the IP address of our host.
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#
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# PLUTO_MY_ID
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# is the ID of our host.
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#
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# PLUTO_MY_CLIENT
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# is the IP address / count of our client subnet. If
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# the client is just the host, this will be the
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# host's own IP address / max (where max is 32 for
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# IPv4 and 128 for IPv6).
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#
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# PLUTO_MY_SOURCEIP
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# PLUTO_MY_SOURCEIP4_$i
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# PLUTO_MY_SOURCEIP6_$i
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# contains IPv4/IPv6 virtual IP received from a responder,
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# $i enumerates from 1 to the number of IP per address family.
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# PLUTO_MY_SOURCEIP is a legacy variable and equal to the first
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# virtual IP, IPv4 or IPv6.
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#
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# PLUTO_MY_PROTOCOL
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# is the IP protocol that will be transported.
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#
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# PLUTO_MY_PORT
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# is the UDP/TCP port to which the IPsec SA is
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# restricted on our side. For ICMP/ICMPv6 this contains the
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# message type, and PLUTO_PEER_PORT the message code.
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#
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# PLUTO_PEER
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# is the IP address of our peer.
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#
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# PLUTO_PEER_ID
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# is the ID of our peer.
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#
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# PLUTO_PEER_CLIENT
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# is the IP address / count of the peer's client sub-
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# net. If the client is just the peer, this will be
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# the peer's own IP address / max (where max is 32
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# for IPv4 and 128 for IPv6).
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#
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# PLUTO_PEER_SOURCEIP
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# PLUTO_PEER_SOURCEIP4_$i
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# PLUTO_PEER_SOURCEIP6_$i
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# contains IPv4/IPv6 virtual IP sent to an initiator,
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# $i enumerates from 1 to the number of IP per address family.
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# PLUTO_PEER_SOURCEIP is a legacy variable and equal to the first
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# virtual IP, IPv4 or IPv6.
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#
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# PLUTO_PEER_PROTOCOL
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# is the IP protocol that will be transported.
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#
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# PLUTO_PEER_PORT
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# is the UDP/TCP port to which the IPsec SA is
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# restricted on the peer side. For ICMP/ICMPv6 this contains the
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# message code, and PLUTO_MY_PORT the message type.
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#
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# PLUTO_XAUTH_ID
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# is an optional user ID employed by the XAUTH protocol
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#
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# PLUTO_MARK_IN
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# is an optional XFRM mark set on the inbound IPsec SA
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#
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# PLUTO_MARK_OUT
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# is an optional XFRM mark set on the outbound IPsec SA
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#
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# PLUTO_IF_ID_IN
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# is an optional XFRM interface ID set on the inbound IPsec SA
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#
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# PLUTO_IF_ID_OUT
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# is an optional XFRM interface ID set on the outbound IPsec SA
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#
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# PLUTO_UDP_ENC
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# contains the remote UDP port in the case of ESP_IN_UDP
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# encapsulation
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#
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# PLUTO_DNS4_$i
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# PLUTO_DNS6_$i
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# contains IPv4/IPv6 DNS server attribute received from a
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# responder, $i enumerates from 1 to the number of servers per
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# address family.
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#
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# define a minimum PATH environment in case it is not set
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PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin"
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export PATH
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# resolve octal escape sequences
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PLUTO_MY_ID=`printf "$PLUTO_MY_ID"`
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PLUTO_PEER_ID=`printf "$PLUTO_PEER_ID"`
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case "$PLUTO_VERB:$1" in
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up-host:)
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# connection to me coming up
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# If you are doing a custom version, firewall commands go here.
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;;
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down-host:)
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# connection to me going down
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# If you are doing a custom version, firewall commands go here.
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;;
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up-client:)
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# connection to my client subnet coming up
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# If you are doing a custom version, firewall commands go here.
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iptables -A FORWARD -i eth1 -o $PLUTO_INTERFACE -s PH_IP_ALICE \
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-d $PLUTO_PEER_CLIENT -j ACCEPT
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iptables -A FORWARD -o eth1 -i $PLUTO_INTERFACE -d PH_IP_ALICE \
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-s $PLUTO_PEER_CLIENT -j ACCEPT
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iptables -t nat -A POSTROUTING -o $PLUTO_INTERFACE -s PH_IP_ALICE \
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-d $PLUTO_PEER_CLIENT -j SNAT --to-source $PLUTO_MY_SOURCEIP
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echo "inserted NAT rule mapping PH_IP_ALICE to virtual IP $PLUTO_MY_SOURCEIP" >&2
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;;
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down-client:)
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# connection to my client subnet going down
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# If you are doing a custom version, firewall commands go here.
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iptables -D FORWARD -i eth1 -o $PLUTO_INTERFACE -s PH_IP_ALICE \
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-d $PLUTO_PEER_CLIENT -j ACCEPT
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iptables -D FORWARD -o eth1 -i $PLUTO_INTERFACE -d PH_IP_ALICE \
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-s $PLUTO_PEER_CLIENT -j ACCEPT
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iptables -t nat -D POSTROUTING -o $PLUTO_INTERFACE -s PH_IP_ALICE \
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-d $PLUTO_PEER_CLIENT -j SNAT --to-source $PLUTO_MY_SOURCEIP
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echo "deleted NAT rule mapping PH_IP_ALICE to virtual IP $PLUTO_MY_SOURCEIP" >&2
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;;
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*) echo "$0: unknown verb \`$PLUTO_VERB' or parameter \`$1'" >&2
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exit 1
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;;
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esac
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