We have made a small and dirty bash script which installs and configures OpenVPN on CentOS 5 32bit. The VPN server’s primary (and only) use is for safe browsing i.e. tunneling all your traffic through your VPS. The script also generates your client configuration file along with the necessary keys for authentication. Requirements 1. CentOS 5 32bit minimal OS template 2. TUN/TAP device enabled on your VPS 3. iptables NAT support You will have to open a ticket to request a TUN/TAP device to be enabled on your VPS. If you’re not a customer of ours and your host’s support staff doesn’t know how to do this, you may tell them to execute the following commands on the hardware node where your VPS is hosted. vzctl stop YOUR_VEID vzctl set YOUR_VEID –devices c:10:200:rw –save vzctl set YOUR_VEID –capability net_admin:on –save vzctl start YOUR_VEID vzctl exec YOUR_VEID “mkdir -p /dev/net; mknod /dev/net/tun c 10 200; chmod 600 /dev/net/tun” # iptables support vzctl stop YOUR_VEID vzctl set YOUR_VEID –iptables ipt_REJECT –iptables ipt_tos –iptables ipt_TOS –iptables ipt_LOG –iptables ip_conntrack –iptables ipt_limit –iptables ipt_multiport –iptables iptable_filter –iptables iptable_mangle –iptables ipt_TCPMSS –iptables ipt_tcpmss –iptables ipt_ttl –iptables ipt_length –iptables ipt_state –iptables iptable_nat –iptables ip_nat_ftp –save vzctl start YOUR_VEID Make sure they will replace ‘YOUR_VEID’ with your VPS’s VEID and you will be ready to roll Login to your VPS as root and execute the following commands wget http://vpsnoc.com/scripts/install-openvpn.sh chmod +x install-openvpn.sh ./install-openvpn.sh You will be prompted to enter values for your server and client certificate, feel free to accept (hit enter) the default values. Its not recommended to setup a password for your server certificate as you will have to type in the password each time you wish to start/restart the openvpn daemon. You can however set a password for your client’s certificate since it offers extra level of protection in case your certificate and key files are compromised. You will be prompted for that password each time you connect on your VPS’s VPN. After the script finished installing openvpn (should be very quick) the client keys and the openvpn clientconfiguration file will be archived in /root/keys.tgz You may use a sftp/scp client such as winscp or filezilla to download the archive on your computer. If you already haven’t installed openvpn for windows you may do so now. You may use winrar or 7zip to extract the content of keys.tgz in C:\Program Files\OpenVPN\config\VPN (create a folder named VPN there) After you have extracted the files from keys.tgz in the above folder, you may start openvpn-gui from the start menu, right click the tray icon, go to VPN and click connect. After the icon turns green all your traffic will be forwarded through your VPS, no extra configuration on your browser/IM client/email client is required. If you’re facing issues make sure that your computer clock is synchronized, if so make sure that your VPS’s clock is correct as well. If it’s not you will have to ask your host to sync it. For any other issues and feedback please e-mail us at support@vpsnoc.com You may use and modify this script however you see fit, provided that you do not edit the original copyright. #!/bin/bash # Quick and dirty OpenVPN install script # Tested on Centos 5.x 32bit, openvz minimal CentOS OS templates # Please submit feedback and questions at support@vpsnoc.com # John Malkowski vpsnoc.com 01/04/2010 ip=`grep IPADDR /etc/sysconfig/network-scripts/ifcfg-venet0:0 | awk -F= ‘{print $2}’` wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm rpm -iv rpmforge-release-0.3.6-1.el5.rf.i386.rpm rm -rf rpmforge-release-0.3.6-1.el5.rf.i386.rpm yum -y install openvpn openssl openssl-devel cd /etc/openvpn/ cp -R /usr/share/doc/openvpn-2.0.9/easy-rsa/ /etc/openvpn/ cd /etc/openvpn/easy-rsa/2.0/ chmod +rwx * . ../vars ./clean-all source ./vars echo -e “\n\n\n\n\n\n\n” | ./build-ca clear echo “####################################” echo “Feel free to accept default values” echo “Wouldn’t recommend setting a password here” echo “Then you’d have to type in the password each time openVPN starts/restarts” echo “####################################” ./build-key-server server ./build-dh cp keys/{ca.crt,ca.key,server.crt,server.key,dh1024.pem} /etc/openvpn/ clear echo “####################################” echo “Feel free to accept default values” echo “This is your client key, you may set a password here but it’s not required” echo “####################################” ./build-key client1 cd keys/ client=” client remote $ip 1194 dev tun comp-lzo ca ca.crt cert client1.crt key client1.key route-delay 2 route-method exe redirect-gateway def1 dhcp-option DNS 10.8.0.1 verb 3″ echo “$client” > $HOSTNAME.ovpn tar czf keys.tgz ca.crt ca.key client1.crt client1.csr client1.key $HOSTNAME.ovpn mv keys.tgz /root opvpn=’ dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca ca.crt cert server.crt key server.key dh dh1024.pem push “route 10.8.0.0 255.255.255.0″ push “redirect-gateway” comp-lzo keepalive 10 60 ping-timer-rem persist-tun persist-key group nobody daemon’ echo “$opvpn” > /etc/openvpn/openvpn.conf echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o venet0 -j MASQUERADE iptables-save > /etc/sysconfig/iptables sed -i ‘s/eth0/venet0/g’ /etc/sysconfig/iptables # dirty vz fix for iptables-save echo “net.ipv4.ip_forward=1″ >> /etc/sysctl.conf /etc/init.d/openvpn start clear echo “OpenVPN has been installed Download /root/keys.tgz using winscp or other sftp/scp client such as filezilla Create a directory named vpn at C:\Program Files\OpenVPN\config\ and untar the content of keys.tgz there Start openvpn-gui, right click the tray icon go to vpn and click connect.
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