463 lines
14 KiB
Bash
Executable File
463 lines
14 KiB
Bash
Executable File
#!/bin/sh
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#
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# Script for automatic setup of an IPsec VPN server on CentOS/RHEL 6 & 7.
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# Works on dedicated servers and any KVM- or Xen-based Virtual Private Server (VPS).
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#
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# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC! THIS IS MEANT TO BE RUN
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# ON YOUR DEDICATED SERVER OR VPS!
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#
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# Copyright (C) 2015-2016 Lin Song <linsongui@gmail.com>
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# Based on the work of Thomas Sarlandie (Copyright 2012)
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#
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# This work is licensed under the Creative Commons Attribution-ShareAlike 3.0
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# Unported License: http://creativecommons.org/licenses/by-sa/3.0/
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#
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# Attribution required: please include my name in any derivative and let me
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# know how you have improved it!
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# =====================================================
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# Define your own values for these variables
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# - IPsec pre-shared key, VPN username and password
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# - All values MUST be placed inside 'single quotes'
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# - DO NOT use these characters within values: \ " '
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YOUR_IPSEC_PSK=''
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YOUR_USERNAME=''
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YOUR_PASSWORD=''
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# Important Notes: https://git.io/vpnnotes
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# Setup VPN Clients: https://git.io/vpnclients
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# =====================================================
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export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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exiterr() { echo "Error: ${1}" >&2; exit 1; }
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exiterr2() { echo "Error: 'yum install' failed." >&2; exit 1; }
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if [ ! -f /etc/redhat-release ]; then
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exiterr "This script only supports CentOS/RHEL."
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fi
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if ! grep -qs -e "release 6" -e "release 7" /etc/redhat-release; then
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exiterr "This script only supports CentOS/RHEL 6 and 7."
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fi
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if [ -f /proc/user_beancounters ]; then
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exiterr "This script does not support OpenVZ VPS."
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fi
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if [ "$(id -u)" != 0 ]; then
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exiterr "Script must be run as root. Try 'sudo sh $0'"
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fi
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eth0_state=$(cat /sys/class/net/eth0/operstate 2>/dev/null)
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if [ -z "$eth0_state" ] || [ "$eth0_state" = "down" ]; then
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cat 1>&2 <<'EOF'
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Error: Network interface 'eth0' is not available.
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Run 'cat /proc/net/dev' to find the active network interface,
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then use it to replace ALL 'eth0' and 'eth+' in this script.
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EOF
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exit 1
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fi
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[ -n "$YOUR_IPSEC_PSK" ] && VPN_IPSEC_PSK="$YOUR_IPSEC_PSK"
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[ -n "$YOUR_USERNAME" ] && VPN_USER="$YOUR_USERNAME"
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[ -n "$YOUR_PASSWORD" ] && VPN_PASSWORD="$YOUR_PASSWORD"
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if [ -z "$VPN_IPSEC_PSK" ] && [ -z "$VPN_USER" ] && [ -z "$VPN_PASSWORD" ]; then
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echo "VPN credentials not set by user. Generating random PSK and password..."
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echo
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VPN_IPSEC_PSK="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
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VPN_USER=vpnuser
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VPN_PASSWORD="$(LC_CTYPE=C tr -dc 'A-HJ-NPR-Za-km-z2-9' < /dev/urandom | head -c 16)"
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fi
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if [ -z "$VPN_IPSEC_PSK" ] || [ -z "$VPN_USER" ] || [ -z "$VPN_PASSWORD" ]; then
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exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
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fi
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cat <<'EOF'
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VPN setup in progress... Please be patient.
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EOF
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# Create and change to working dir
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mkdir -p /opt/src
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cd /opt/src || exiterr "Cannot enter /opt/src."
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# Make sure basic commands exist
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yum -y install wget bind-utils openssl || exiterr2
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yum -y install iproute gawk grep sed net-tools || exiterr2
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cat <<'EOF'
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Trying to auto discover IPs of this server...
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In case the script hangs here for more than a few minutes,
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use Ctrl-C to interrupt. Then edit it and manually enter IPs.
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EOF
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# In case auto IP discovery fails, you may manually enter server IPs here.
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# If your server only has a public IP, put that public IP on both lines.
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PUBLIC_IP=${VPN_PUBLIC_IP:-''}
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PRIVATE_IP=${VPN_PRIVATE_IP:-''}
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# In Amazon EC2, these two variables will be retrieved from metadata
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/public-ipv4')
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(wget -t 3 -T 15 -qO- 'http://169.254.169.254/latest/meta-data/local-ipv4')
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# Try to find IPs for non-EC2 servers
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://whatismyip.akamai.com)
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ifconfig eth0 | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
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# Check IPs for correct format
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IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
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if ! printf %s "$PUBLIC_IP" | grep -Eq "$IP_REGEX"; then
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exiterr "Cannot find valid public IP. Edit the script and manually enter IPs."
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fi
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if ! printf %s "$PRIVATE_IP" | grep -Eq "$IP_REGEX"; then
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exiterr "Cannot find valid private IP. Edit the script and manually enter IPs."
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fi
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# Add the EPEL repository
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yum -y install epel-release || exiterr2
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# Install necessary packages
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yum -y install nss-devel nspr-devel pkgconfig pam-devel \
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libcap-ng-devel libselinux-devel \
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curl-devel flex bison gcc make \
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fipscheck-devel unbound-devel xmlto || exiterr2
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yum -y install ppp xl2tpd || exiterr2
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# Install Fail2Ban to protect SSH
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yum -y install fail2ban || exiterr2
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# Install libevent2 and systemd-devel (CentOS 7)
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if grep -qs "release 6" /etc/redhat-release; then
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yum -y remove libevent-devel
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yum -y install libevent2-devel || exiterr2
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elif grep -qs "release 7" /etc/redhat-release; then
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yum -y install libevent-devel systemd-devel || exiterr2
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fi
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# Compile and install Libreswan
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swan_ver=3.17
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swan_file="libreswan-${swan_ver}.tar.gz"
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swan_url1="https://download.libreswan.org/$swan_file"
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swan_url2="https://github.com/libreswan/libreswan/archive/v${swan_ver}.tar.gz"
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wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"
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[ "$?" != "0" ] && exiterr "Cannot download Libreswan source."
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/bin/rm -rf "/opt/src/libreswan-$swan_ver"
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tar xzf "$swan_file" && /bin/rm -f "$swan_file"
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cd "libreswan-$swan_ver" || exiterr "Cannot enter Libreswan source dir."
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echo "WERROR_CFLAGS =" > Makefile.inc.local
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make -s programs && make -s install
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# Verify the install and clean up
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cd /opt/src || exiterr "Cannot enter /opt/src."
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/bin/rm -rf "/opt/src/libreswan-$swan_ver"
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/usr/local/sbin/ipsec --version 2>/dev/null | grep -qs "$swan_ver"
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[ "$?" != "0" ] && exiterr "Libreswan $swan_ver failed to build."
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# Create IPsec (Libreswan) config
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sys_dt="$(date +%Y-%m-%d-%H:%M:%S)"
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/bin/cp -f /etc/ipsec.conf "/etc/ipsec.conf.old-$sys_dt" 2>/dev/null
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cat > /etc/ipsec.conf <<EOF
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version 2.0
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config setup
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virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/23
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protostack=netkey
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nhelpers=0
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interfaces=%defaultroute
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uniqueids=no
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conn shared
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left=$PRIVATE_IP
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leftid=$PUBLIC_IP
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right=%any
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forceencaps=yes
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authby=secret
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pfs=no
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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ike=3des-sha1,aes-sha1
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phase2alg=3des-sha1,aes-sha1
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conn l2tp-psk
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auto=add
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leftsubnet=$PRIVATE_IP/32
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leftnexthop=%defaultroute
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leftprotoport=17/1701
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rightprotoport=17/%any
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type=transport
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auth=esp
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also=shared
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conn xauth-psk
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auto=add
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leftsubnet=0.0.0.0/0
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rightaddresspool=192.168.43.10-192.168.43.250
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modecfgdns1=8.8.8.8
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modecfgdns2=8.8.4.4
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leftxauthserver=yes
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rightxauthclient=yes
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leftmodecfgserver=yes
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rightmodecfgclient=yes
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modecfgpull=yes
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xauthby=file
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ike-frag=yes
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ikev2=never
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cisco-unity=yes
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also=shared
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EOF
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# Specify IPsec PSK
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/bin/cp -f /etc/ipsec.secrets "/etc/ipsec.secrets.old-$sys_dt" 2>/dev/null
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cat > /etc/ipsec.secrets <<EOF
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$PUBLIC_IP %any : PSK "$VPN_IPSEC_PSK"
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EOF
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# Create xl2tpd config
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/bin/cp -f /etc/xl2tpd/xl2tpd.conf "/etc/xl2tpd/xl2tpd.conf.old-$sys_dt" 2>/dev/null
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cat > /etc/xl2tpd/xl2tpd.conf <<'EOF'
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[global]
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port = 1701
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[lns default]
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ip range = 192.168.42.10-192.168.42.250
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local ip = 192.168.42.1
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require chap = yes
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refuse pap = yes
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require authentication = yes
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name = l2tpd
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pppoptfile = /etc/ppp/options.xl2tpd
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length bit = yes
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EOF
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# Set xl2tpd options
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/bin/cp -f /etc/ppp/options.xl2tpd "/etc/ppp/options.xl2tpd.old-$sys_dt" 2>/dev/null
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cat > /etc/ppp/options.xl2tpd <<'EOF'
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ipcp-accept-local
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ipcp-accept-remote
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ms-dns 8.8.8.8
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ms-dns 8.8.4.4
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noccp
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auth
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crtscts
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mtu 1280
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mru 1280
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lock
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proxyarp
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lcp-echo-failure 4
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lcp-echo-interval 30
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connect-delay 5000
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EOF
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# Create VPN credentials
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/bin/cp -f /etc/ppp/chap-secrets "/etc/ppp/chap-secrets.old-$sys_dt" 2>/dev/null
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cat > /etc/ppp/chap-secrets <<EOF
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# Secrets for authentication using CHAP
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# client server secret IP addresses
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"$VPN_USER" l2tpd "$VPN_PASSWORD" *
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EOF
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/bin/cp -f /etc/ipsec.d/passwd "/etc/ipsec.d/passwd.old-$sys_dt" 2>/dev/null
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VPN_PASSWORD_ENC=$(openssl passwd -1 "$VPN_PASSWORD")
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cat > /etc/ipsec.d/passwd <<EOF
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$VPN_USER:$VPN_PASSWORD_ENC:xauth-psk
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EOF
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# Update sysctl settings
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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/bin/cp -f /etc/sysctl.conf "/etc/sysctl.conf.old-$sys_dt" 2>/dev/null
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cat >> /etc/sysctl.conf <<'EOF'
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# Added by hwdsl2 VPN script
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kernel.msgmnb = 65536
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kernel.msgmax = 65536
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kernel.shmmax = 68719476736
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kernel.shmall = 4294967296
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net.ipv4.ip_forward = 1
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net.ipv4.tcp_syncookies = 1
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net.ipv4.conf.all.accept_source_route = 0
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net.ipv4.conf.default.accept_source_route = 0
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net.ipv4.conf.all.accept_redirects = 0
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net.ipv4.conf.default.accept_redirects = 0
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net.ipv4.conf.all.send_redirects = 0
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net.ipv4.conf.default.send_redirects = 0
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net.ipv4.conf.lo.send_redirects = 0
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net.ipv4.conf.eth0.send_redirects = 0
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net.ipv4.conf.all.rp_filter = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.lo.rp_filter = 0
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net.ipv4.conf.eth0.rp_filter = 0
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net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.icmp_ignore_bogus_error_responses = 1
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net.core.wmem_max = 12582912
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net.core.rmem_max = 12582912
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net.ipv4.tcp_rmem = 10240 87380 12582912
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net.ipv4.tcp_wmem = 10240 87380 12582912
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EOF
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fi
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# Create basic IPTables rules. First check for existing rules.
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# - If IPTables is "empty", simply write out the new rules.
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# - If *not* empty, insert new rules and save them with existing ones.
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if ! grep -qs "hwdsl2 VPN script" /etc/sysconfig/iptables; then
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service fail2ban stop >/dev/null 2>&1
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iptables-save > "/etc/sysconfig/iptables.old-$sys_dt"
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sshd_port="$(ss -nlput | grep sshd | awk '{print $5}' | head -n 1 | grep -Eo '[0-9]{1,5}$')"
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if [ "$(iptables-save | grep -c '^\-')" = "0" ] && [ "$sshd_port" = "22" ]; then
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cat > /etc/sysconfig/iptables <<EOF
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# Added by hwdsl2 VPN script
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*filter
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:INPUT ACCEPT [0:0]
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:FORWARD ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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-A INPUT -m conntrack --ctstate INVALID -j DROP
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-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A INPUT -i lo -j ACCEPT
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-A INPUT -d 127.0.0.0/8 -j REJECT
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-A INPUT -p icmp -j ACCEPT
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-A INPUT -p udp --dport 67:68 --sport 67:68 -j ACCEPT
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A INPUT -p udp -m multiport --dports 500,4500 -j ACCEPT
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-A INPUT -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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-A INPUT -p udp --dport 1701 -j DROP
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-A INPUT -j DROP
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-A FORWARD -m conntrack --ctstate INVALID -j DROP
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# Uncomment to DROP traffic between VPN clients themselves
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# -A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
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# -A FORWARD -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
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-A FORWARD -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A FORWARD -i ppp+ -o eth+ -j ACCEPT
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-A FORWARD -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
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-A FORWARD -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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-A FORWARD -s 192.168.43.0/24 -o eth+ -j ACCEPT
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-A FORWARD -j DROP
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COMMIT
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*nat
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:PREROUTING ACCEPT [0:0]
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:OUTPUT ACCEPT [0:0]
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:POSTROUTING ACCEPT [0:0]
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-A POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source $PRIVATE_IP
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-A POSTROUTING -s 192.168.43.0/24 -o eth+ -m policy --dir out --pol none -j SNAT --to-source $PRIVATE_IP
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COMMIT
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EOF
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else
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iptables -I INPUT 1 -p udp -m multiport --dports 500,4500 -j ACCEPT
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iptables -I INPUT 2 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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iptables -I INPUT 3 -p udp --dport 1701 -j DROP
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iptables -I FORWARD 1 -m conntrack --ctstate INVALID -j DROP
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iptables -I FORWARD 2 -i eth+ -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I FORWARD 3 -i ppp+ -o eth+ -j ACCEPT
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iptables -I FORWARD 4 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j ACCEPT
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iptables -I FORWARD 5 -i eth+ -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I FORWARD 6 -s 192.168.43.0/24 -o eth+ -j ACCEPT
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# Uncomment to DROP traffic between VPN clients themselves
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# iptables -I FORWARD 2 -i ppp+ -o ppp+ -s 192.168.42.0/24 -d 192.168.42.0/24 -j DROP
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# iptables -I FORWARD 3 -s 192.168.43.0/24 -d 192.168.43.0/24 -j DROP
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iptables -A FORWARD -j DROP
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iptables -t nat -I POSTROUTING -s 192.168.43.0/24 -o eth+ -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP"
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iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o eth+ -j SNAT --to-source "$PRIVATE_IP"
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echo "# Modified by hwdsl2 VPN script" > /etc/sysconfig/iptables
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iptables-save >> /etc/sysconfig/iptables
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fi
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fi
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# Create basic Fail2Ban rules
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if [ ! -f /etc/fail2ban/jail.local ] ; then
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cat > /etc/fail2ban/jail.local <<'EOF'
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[DEFAULT]
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ignoreip = 127.0.0.1/8
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bantime = 600
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findtime = 600
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maxretry = 5
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backend = auto
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[ssh-iptables]
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enabled = true
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filter = sshd
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action = iptables[name=SSH, port=ssh, protocol=tcp]
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logpath = /var/log/secure
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EOF
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fi
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# Start services at boot
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if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
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/bin/cp -f /etc/rc.local "/etc/rc.local.old-$sys_dt" 2>/dev/null
|
|
cat >> /etc/rc.local <<'EOF'
|
|
|
|
# Added by hwdsl2 VPN script
|
|
iptables-restore < /etc/sysconfig/iptables
|
|
service fail2ban restart
|
|
service ipsec start
|
|
service xl2tpd start
|
|
echo 1 > /proc/sys/net/ipv4/ip_forward
|
|
EOF
|
|
fi
|
|
|
|
# Restore SELinux contexts
|
|
restorecon /etc/ipsec.d/*db 2>/dev/null
|
|
restorecon /usr/local/sbin -Rv 2>/dev/null
|
|
restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
|
|
|
|
# Reload sysctl.conf
|
|
sysctl -e -q -p
|
|
|
|
# Update file attributes
|
|
chmod +x /etc/rc.local
|
|
chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
|
|
|
|
# Apply new IPTables rules
|
|
iptables-restore < /etc/sysconfig/iptables
|
|
|
|
# Restart services
|
|
service fail2ban stop >/dev/null 2>&1
|
|
service ipsec stop >/dev/null 2>&1
|
|
service xl2tpd stop >/dev/null 2>&1
|
|
service fail2ban start
|
|
service ipsec start
|
|
service xl2tpd start
|
|
|
|
cat <<EOF
|
|
|
|
================================================
|
|
|
|
IPsec VPN server is now ready for use!
|
|
|
|
Connect to your new VPN with these details:
|
|
|
|
Server IP: $PUBLIC_IP
|
|
IPsec PSK: $VPN_IPSEC_PSK
|
|
Username: $VPN_USER
|
|
Password: $VPN_PASSWORD
|
|
|
|
Write these down. You'll need them to connect!
|
|
|
|
Important Notes: https://git.io/vpnnotes
|
|
Setup VPN Clients: https://git.io/vpnclients
|
|
|
|
================================================
|
|
|
|
EOF
|
|
|
|
exit 0
|