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#!/bin/sh
################################################################################
#
# ipsecvpn -- script for use on a roadwarrior to start/stop a tunnel-mode
# IPSEC connection
#
# (c) 2004,2005,2014 - Tom Eastep (teastep@shorewall.net)
#
# This program is part of Shorewall.
#
# 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.
#
# 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.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
RCDLINKS="2,S42 3,S42 6,K42"
#### BEGIN INIT INFO
# Provides: ipsecvpn
# Required-Start: $shorewall
# Required-Stop:
# Default-Start: 2 3 5
# Default-Stop: 0 1 6
# Description: starts and stops a tunnel-mode VPN connection
### END INIT INFO
# chkconfig: 2345 26 89
# description: IPSEC tunnel-mode connection
#
################################################################################
#
# External Interface
#
INTERFACE=eth0
#
# Remote IPSEC Gateway
#
GATEWAY=1.2.3.4
#
# Networks behind the remote gateway (space-separated list)
#
NETWORKS="192.168.1.0/24"
#
# Directory where X.509 certificates are stored.
#
CERTS=/etc/certs
#
# Certificate to be used for this connection. The cert
# directory must contain:
#
# ${CERT}.pem - the certificate
# ${CERT}_key.pem - the certificates's key
#
CERT=roadwarrior
#
# The setkey binary
#
SETKEY=/usr/sbin/setkey
#
# The racoon binary
#
RACOON=/usr/sbin/racoon
#
# Message to stderr
#
error_message() # $* = Error Message
{
echo " $@" >&2
}
#
# Fatal error -- stops the firewall after issuing the error message
#
fatal_error() # $* = Error Message
{
echo " Error: $@" >&2
exit 2
}
#
# Find interface address--returns the first IP address assigned to the passed
# device
#
find_first_interface_address() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$(ip -f inet addr show $1 2> /dev/null | grep inet | head -n1)
#
# If there wasn't one, bail out now
#
[ -n "$addr" ] || fatal_error "Can't determine the IP address of $1"
#
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
# along with everything else on the line
#
echo $addr | sed 's/inet //;s/\/.*//;s/ peer.*//'
}
#
# Create a Racoon configuration file using the variables above
#
make_racoon_conf() {
echo "path certificate \"$CERTS\";"
echo
echo "listen"
echo "{"
echo " isakmp $IPADDR;"
echo "}"
echo
echo "remote $GATEWAY"
echo "{"
echo " exchange_mode main;"
echo " certificate_type x509 \"$CERT.pem\" \"${CERT}_key.pem\";"
echo " verify_cert on;"
echo " my_identifier asn1dn ;"
echo " peers_identifier asn1dn ;"
echo " verify_identifier on ;"
echo " lifetime time 24 hour ;"
echo " proposal {"
echo " encryption_algorithm blowfish;"
echo " hash_algorithm sha1;"
echo " authentication_method rsasig ;"
echo " dh_group 2 ;"
echo " }"
echo "}"
echo
for network in $NETWORKS; do
echo "sainfo address $IPADDR/32 any address $network any"
echo "{"
echo " pfs_group 2;"
echo " lifetime time 12 hour ;"
echo " encryption_algorithm blowfish ;"
echo " authentication_algorithm hmac_sha1, hmac_md5 ;"
echo " compression_algorithm deflate ;"
echo "}"
echo
echo "sainfo address $network any address $IPADDR/32 any"
echo "{"
echo " pfs_group 2;"
echo " lifetime time 12 hour ;"
echo " encryption_algorithm blowfish ;"
echo " authentication_algorithm hmac_sha1, hmac_md5 ;"
echo " compression_algorithm deflate ;"
echo "}"
done
echo "sainfo address $IPADDR/32 any address $GATEWAY/32 any"
echo "{"
echo " pfs_group 2;"
echo " lifetime time 12 hour ;"
echo " encryption_algorithm blowfish ;"
echo " authentication_algorithm hmac_sha1, hmac_md5 ;"
echo " compression_algorithm deflate ;"
echo "}"
echo
echo "sainfo address $GATEWAY/32 any address $IPADDR/32 any"
echo "{"
echo " pfs_group 2;"
echo " lifetime time 12 hour ;"
echo " encryption_algorithm blowfish ;"
echo " authentication_algorithm hmac_sha1, hmac_md5 ;"
echo " compression_algorithm deflate ;"
echo "}"
}
#
# Make a setkey configuration file using the variables above
#
make_setkey_conf()
{
echo "flush;"
echo "spdflush;"
echo "spdadd $IPADDR/32 $GATEWAY/32 any -P out ipsec esp/tunnel/${IPADDR}-${GATEWAY}/require;"
echo "spdadd $GATEWAY/32 $IPADDR/32 any -P in ipsec esp/tunnel/${GATEWAY}-${IPADDR}/require;"
for network in $NETWORKS; do
echo "spdadd $IPADDR/32 $network any -P out ipsec esp/tunnel/${IPADDR}-${GATEWAY}/require;"
echo "spdadd $network $IPADDR/32 any -P in ipsec esp/tunnel/${GATEWAY}-${IPADDR}/require;"
done
}
#
# Start the Tunnel
#
start()
{
#
# Get the first IP address configured on the device in INTERFACE
#
IPADDR=$(find_first_interface_address $INTERFACE)
#
# Create the name of the setkey temporary file
#
TEMPFILE=$(mktemp /tmp/$(basename $0).XXXXXXXX)
[ $? -eq 0 ] || fatal_error "Can't create temporary file name"
#
# Create the file
#
make_setkey_conf > $TEMPFILE
#
# Create the SPD
#
$SETKEY -f $TEMPFILE
#
# We can now remove the file
#
rm -f $TEMPFILE
#
# Create another name -- make this distict to aid debugging
# (just comment out the 'rm' commands)
#
TEMPFILE=$(mktemp /tmp/$(basename $0).XXXXXXXX)
[ $? -eq 0 ] || fatal_error "Can't create temporary file name"
#
# Create the file
#
make_racoon_conf > $TEMPFILE
#
# Start Racoon Daemon
#
$RACOON -4 -f $TEMPFILE
#
# Once the Daemon is running, we can remove the file
#
rm -f $TEMPFILE
}
#
# Stop the Tunnel
#
stop()
{
#
# Kill any racoon daemons
#
killall racoon
#
# Purge the SAD and SPD
#
setkey -F -FP
}
#
# Display command syntax and abend
#
usage()
{
error_message "usage: $(basename $0) [start|stop|restart]"
exit 1
}
################################################################################
# C O D E S T A R T S H E R E
################################################################################
[ $# -eq 1 ] || usage
case $1 in
start)
start
;;
stop)
stop
;;
restart)
stop
sleep 2
start
;;
*)
usage
;;
esac
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