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Libreswan VPN setup script.
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| #!/bin/bash -ex | |
| # Set some local variables | |
| PRIVATE_IP=`curl -s http://169.254.169.254/latest/meta-data/local-ipv4` | |
| PUBLIC_IP=`curl -s http://169.254.169.254/latest/meta-data/public-ipv4` | |
| VPN_DNSHOST=`grep -o "nameserver.*" /etc/resolv.conf | awk '{print $2}'` | |
| yum install -y libreswan ppp xl2tpd | |
| # Setup IPSEC Tunnel | |
| cat > /etc/ipsec.conf <<EOF | |
| config setup | |
| protostack=netkey | |
| dumpdir=/var/run/pluto/ | |
| nat_traversal=yes | |
| virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:25.0.0.0/8,%v4:100.64.0.0/10,%v6:fd00::/8,%v6:fe80::/10,%4:!$VPN_NETWORK | |
| include /etc/ipsec.d/*.conf | |
| EOF | |
| cat > /etc/ipsec.d/vpnpsk.conf <<EOF | |
| conn vpnpsk | |
| connaddrfamily=ipv4 | |
| auto=add | |
| left=$PRIVATE_IP | |
| leftid=$PUBLIC_IP | |
| leftsubnet=$PRIVATE_IP/32 | |
| leftnexthop=%defaultroute | |
| leftprotoport=17/1701 | |
| rightprotoport=17/%any | |
| right=%any | |
| rightsubnetwithin=0.0.0.0/0 | |
| forceencaps=yes | |
| authby=secret | |
| pfs=no | |
| type=transport | |
| auth=esp | |
| ike=3des-sha1,aes-sha1 | |
| phase2alg=3des-sha1,aes-sha1 | |
| rekey=no | |
| keyingtries=5 | |
| dpddelay=30 | |
| dpdtimeout=120 | |
| dpdaction=clear | |
| EOF | |
| # Set pre-shared key | |
| cat > /etc/ipsec.d/vpnpsk.secrets <<EOF | |
| $PUBLIC_IP %any : PSK "$IPSEC_PSK" | |
| EOF | |
| chmod 600 /etc/ipsec.d/vpnpsk.secrets | |
| # Setup XL2TP | |
| cat > /etc/xl2tpd/xl2tpd.conf <<EOF | |
| [global] | |
| port = 1701 | |
| [lns default] | |
| ip range = $VPN_DHCP_RANGE | |
| local ip = $VPN_LOCAL_IP | |
| require chap = yes | |
| refuse pap = yes | |
| require authentication = yes | |
| name = l2tpd | |
| pppoptfile = /etc/ppp/options.xl2tpd | |
| length bit = yes | |
| EOF | |
| cat > /etc/ppp/options.xl2tpd <<EOF | |
| ipcp-accept-local | |
| ipcp-accept-remote | |
| ms-dns $VPN_DNSHOST | |
| noccp | |
| auth | |
| crtscts | |
| idle 1800 | |
| mtu 1410 | |
| mru 1410 | |
| nodefaultroute | |
| debug | |
| lock | |
| proxyarp | |
| connect-delay 5000 | |
| logfile /var/log/ppp.log | |
| EOF | |
| # Setup PPP user accounts | |
| cat $RS_ATTACH_DIR/vpn_users > /etc/ppp/chap-secrets | |
| chmod 600 /etc/ppp/chap-secrets | |
| # Tweak kernel settings | |
| cat > /etc/sysctl.conf <<EOF | |
| kernel.sysrq = 0 | |
| kernel.core_uses_pid = 1 | |
| net.ipv4.tcp_syncookies = 1 | |
| kernel.msgmnb = 65536 | |
| kernel.msgmax = 65536 | |
| kernel.shmmax = 68719476736 | |
| kernel.shmall = 4294967296 | |
| kernel.printk = 8 4 1 7 | |
| kernel.printk_ratelimit_burst = 10 | |
| kernel.printk_ratelimit = 5 | |
| net.ipv4.ip_forward = 1 | |
| net.ipv4.conf.all.accept_source_route = 0 | |
| net.ipv4.conf.default.accept_source_route = 0 | |
| net.ipv4.conf.all.log_martians = 1 | |
| net.ipv4.conf.default.log_martians = 1 | |
| net.ipv4.conf.all.accept_redirects = 0 | |
| net.ipv4.conf.default.accept_redirects = 0 | |
| net.ipv4.conf.all.send_redirects = 0 | |
| net.ipv4.conf.default.send_redirects = 0 | |
| net.ipv4.conf.all.rp_filter = 0 | |
| net.ipv4.conf.default.rp_filter = 0 | |
| net.ipv6.conf.all.disable_ipv6=1 | |
| net.ipv6.conf.default.disable_ipv6=1 | |
| net.ipv4.icmp_echo_ignore_broadcasts = 1 | |
| net.ipv4.icmp_ignore_bogus_error_responses = 1 | |
| net.ipv4.conf.all.secure_redirects = 0 | |
| net.ipv4.conf.default.secure_redirects = 0 | |
| kernel.randomize_va_space = 1 | |
| net.core.wmem_max=12582912 | |
| net.core.rmem_max=12582912 | |
| net.ipv4.tcp_rmem= 10240 87380 12582912 | |
| net.ipv4.tcp_wmem= 10240 87380 12582912 | |
| EOF | |
| # Setup iptables | |
| cat > /etc/sysconfig/iptables <<EOF | |
| *filter | |
| :INPUT ACCEPT [0:0] | |
| :FORWARD ACCEPT [0:0] | |
| :OUTPUT ACCEPT [0:0] | |
| :ICMPALL - [0:0] | |
| :ZREJ - [0:0] | |
| -A INPUT -m conntrack --ctstate INVALID -j DROP | |
| -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT | |
| -A INPUT -i lo -j ACCEPT | |
| -A INPUT -p icmp --icmp-type 255 -j ICMPALL | |
| -A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT | |
| -A INPUT -p tcp --dport 22 -j ACCEPT | |
| -A INPUT -p udp -m multiport --dports 500,4500 -j ACCEPT | |
| -A INPUT -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT | |
| -A INPUT -p udp --dport 1701 -j DROP | |
| -A INPUT -j ZREJ | |
| -A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT | |
| -A FORWARD -i ppp+ -o eth+ -j ACCEPT | |
| -A FORWARD -j ZREJ | |
| -A ICMPALL -p icmp --fragment -j DROP | |
| -A ICMPALL -p icmp --icmp-type 0 -j ACCEPT | |
| -A ICMPALL -p icmp --icmp-type 3 -j ACCEPT | |
| -A ICMPALL -p icmp --icmp-type 4 -j ACCEPT | |
| -A ICMPALL -p icmp --icmp-type 8 -j ACCEPT | |
| -A ICMPALL -p icmp --icmp-type 11 -j ACCEPT | |
| -A ICMPALL -p icmp -j DROP | |
| -A ZREJ -p tcp -j REJECT --reject-with tcp-reset | |
| -A ZREJ -p udp -j REJECT --reject-with icmp-port-unreachable | |
| -A ZREJ -j REJECT --reject-with icmp-proto-unreachable | |
| COMMIT | |
| *nat | |
| :PREROUTING ACCEPT [0:0] | |
| :INPUT ACCEPT [0:0] | |
| :OUTPUT ACCEPT [0:0] | |
| :POSTROUTING ACCEPT [0:0] | |
| -A POSTROUTING -s ${VPN_NETWORK} -o eth+ -j SNAT --to-source ${PRIVATE_IP} | |
| COMMIT | |
| EOF | |
| # rc.local | |
| cat > /etc/rc.local <<EOF | |
| #!/bin/sh | |
| # | |
| # This script will be executed *after* all the other init scripts. | |
| # You can put your own initialization stuff in here if you don't | |
| # want to do the full Sys V style init stuff. | |
| touch /var/lock/subsys/local | |
| /sbin/service ipsec restart | |
| /sbin/service xl2tpd restart | |
| echo 1 > /proc/sys/net/ipv4/ip_forward | |
| exit 0 | |
| EOF | |
| # Fire everything up | |
| # Make kernel settings take effect | |
| sysctl -p | |
| # Make iptables rules take effect | |
| service iptables restart | |
| # Turn services on | |
| chkconfig xl2tpd on | |
| chkconfig ipsec on | |
| service ipsec start | |
| service xl2tpd start |
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