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