450 lines
13 KiB
Bash
Executable File
450 lines
13 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 and 7.
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# Works on any dedicated server or Virtual Private Server (VPS) except OpenVZ.
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#
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# DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
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#
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# The latest version of this script is available at:
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# https://github.com/hwdsl2/setup-ipsec-vpn
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#
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# Copyright (C) 2015-2017 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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SYS_DT="$(date +%Y-%m-%d-%H:%M:%S)"; export SYS_DT
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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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conf_bk() { /bin/cp -f "$1" "$1.old-$SYS_DT" 2>/dev/null; }
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print_status() { echo; echo "## $1"; echo; }
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check_ip() {
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IP_REGEX="^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$"
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printf %s "$1" | tr -d '\n' | grep -Eq "$IP_REGEX"
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}
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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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echo "Error: This script does not support OpenVZ VPS." >&2
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echo "Try OpenVPN: https://github.com/Nyr/openvpn-install" >&2
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exit 1
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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 $0'"
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fi
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NET_IF0=${VPN_IFACE:-'eth0'}
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NET_IFS=${VPN_IFACE:-'eth+'}
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if_state=$(cat "/sys/class/net/$NET_IF0/operstate" 2>/dev/null)
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if [ -z "$if_state" ] || [ "$if_state" = "down" ] || [ "$NET_IF0" = "lo" ]; then
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echo "Error: Network interface '$NET_IF0' is not available." >&2
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cat 1>&2 <<'EOF'
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DO NOT RUN THIS SCRIPT ON YOUR PC OR MAC!
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If running on a server, try this workaround:
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VPN_IFACE="$(route | grep '^default' | grep -o '[^ ]*$')"
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EOF
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cat 1>&2 <<EOF
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sudo VPN_IFACE="\$VPN_IFACE" sh "$0"
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EOF
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exit 1
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fi
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[ -n "$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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print_status "VPN credentials not set by user. Generating random PSK and password..."
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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 "$VPN_PASSWORD" ]; then
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exiterr "All VPN credentials must be specified. Edit the script and re-enter them."
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fi
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case "$VPN_IPSEC_PSK $VPN_USER $VPN_PASSWORD" in
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*[\\\"\']*)
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exiterr "VPN credentials must not contain any of these characters: \\ \" '"
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;;
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esac
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print_status "VPN setup in progress... Please be patient."
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# Create and change to working dir
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mkdir -p /opt/src
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cd /opt/src || exiterr "Cannot enter /opt/src."
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print_status "Installing packages required for setup..."
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yum -y install wget bind-utils openssl || exiterr2
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yum -y install iproute gawk grep sed net-tools || exiterr2
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print_status "Trying to auto discover IPs of this server..."
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cat <<'EOF'
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In case the script hangs here for more than a few minutes,
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use Ctrl-C to interrupt. Then edit it and manually enter IPs.
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EOF
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# In case auto IP discovery fails, you may manually enter server IPs here.
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# If your server only has a public IP, put that public IP on both lines.
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PUBLIC_IP=${VPN_PUBLIC_IP:-''}
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PRIVATE_IP=${VPN_PRIVATE_IP:-''}
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# Try to auto discover IPs of this server
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[ -z "$PUBLIC_IP" ] && PUBLIC_IP=$(dig @resolver1.opendns.com -t A -4 myip.opendns.com +short)
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[ -z "$PRIVATE_IP" ] && PRIVATE_IP=$(ip -4 route get 1 | awk '{print $NF;exit}')
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# Check IPs for correct format
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check_ip "$PUBLIC_IP" || PUBLIC_IP=$(wget -t 3 -T 15 -qO- http://ipv4.icanhazip.com)
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check_ip "$PUBLIC_IP" || exiterr "Cannot find valid public IP. Edit the script and manually enter IPs."
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check_ip "$PRIVATE_IP" || PRIVATE_IP=$(ifconfig "$NET_IF0" | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*')
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check_ip "$PRIVATE_IP" || exiterr "Cannot find valid private IP. Edit the script and manually enter IPs."
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print_status "Adding the EPEL repository..."
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yum -y install epel-release || exiterr2
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print_status "Installing packages required for the VPN..."
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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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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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else
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yum -y install libevent-devel systemd-devel || exiterr2
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yum -y install iptables-services || exiterr2
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fi
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print_status "Installing Fail2Ban to protect SSH..."
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yum -y install fail2ban || exiterr2
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print_status "Compiling and installing Libreswan..."
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swan_ver=3.19
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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$swan_ver.tar.gz"
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if ! { wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url1" || wget -t 3 -T 30 -nv -O "$swan_file" "$swan_url2"; }; then
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exiterr "Cannot download Libreswan source."
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fi
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/bin/rm -rf "/opt/src/libreswan-$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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if ! /usr/local/sbin/ipsec --version 2>/dev/null | grep -qs -F "$swan_ver"; then
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exiterr "Libreswan $swan_ver failed to build."
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fi
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print_status "Creating VPN configuration..."
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# Create IPsec (Libreswan) config
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conf_bk "/etc/ipsec.conf"
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cat > /etc/ipsec.conf <<EOF
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version 2.0
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config setup
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virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12,%v4:!192.168.42.0/23
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protostack=netkey
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nhelpers=0
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interfaces=%defaultroute
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uniqueids=no
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conn shared
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left=$PRIVATE_IP
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leftid=$PUBLIC_IP
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right=%any
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encapsulation=yes
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authby=secret
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pfs=no
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rekey=no
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keyingtries=5
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dpddelay=30
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dpdtimeout=120
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dpdaction=clear
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ike=3des-sha1,3des-sha1;modp1024,aes-sha1,aes-sha1;modp1024,aes-sha2,aes-sha2;modp1024
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phase2alg=3des-sha1,aes-sha1,aes-sha2
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sha2-truncbug=yes
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conn l2tp-psk
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auto=add
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leftsubnet=$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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phase2=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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conf_bk "/etc/ipsec.secrets"
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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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conf_bk "/etc/xl2tpd/xl2tpd.conf"
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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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conf_bk "/etc/ppp/options.xl2tpd"
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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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mtu 1280
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mru 1280
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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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conf_bk "/etc/ppp/chap-secrets"
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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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conf_bk "/etc/ipsec.d/passwd"
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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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print_status "Updating sysctl settings..."
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if ! grep -qs "hwdsl2 VPN script" /etc/sysctl.conf; then
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conf_bk "/etc/sysctl.conf"
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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.$NET_IF0.send_redirects = 0
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net.ipv4.conf.all.rp_filter = 0
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net.ipv4.conf.default.rp_filter = 0
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net.ipv4.conf.lo.rp_filter = 0
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net.ipv4.conf.$NET_IF0.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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print_status "Updating IPTables rules..."
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# Check if IPTables rules need updating
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ipt_flag=0
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IPT_FILE="/etc/sysconfig/iptables"
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if ! grep -qs "hwdsl2 VPN script" "$IPT_FILE" \
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|| ! iptables -t nat -C POSTROUTING -s 192.168.42.0/24 -o "$NET_IFS" -j SNAT --to-source "$PRIVATE_IP" 2>/dev/null \
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|| ! iptables -t nat -C POSTROUTING -s 192.168.43.0/24 -o "$NET_IFS" -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP" 2>/dev/null; then
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ipt_flag=1
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fi
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# Add IPTables rules for VPN
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if [ "$ipt_flag" = "1" ]; then
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service fail2ban stop >/dev/null 2>&1
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iptables-save > "$IPT_FILE.old-$SYS_DT"
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iptables -I INPUT 1 -m conntrack --ctstate INVALID -j DROP
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iptables -I INPUT 2 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I INPUT 3 -p udp -m multiport --dports 500,4500 -j ACCEPT
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iptables -I INPUT 4 -p udp --dport 1701 -m policy --dir in --pol ipsec -j ACCEPT
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iptables -I INPUT 5 -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 "$NET_IFS" -o ppp+ -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I FORWARD 3 -i ppp+ -o "$NET_IFS" -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 "$NET_IFS" -d 192.168.43.0/24 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
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iptables -I FORWARD 6 -s 192.168.43.0/24 -o "$NET_IFS" -j ACCEPT
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# Uncomment if you wish to disallow 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 "$NET_IFS" -m policy --dir out --pol none -j SNAT --to-source "$PRIVATE_IP"
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iptables -t nat -I POSTROUTING -s 192.168.42.0/24 -o "$NET_IFS" -j SNAT --to-source "$PRIVATE_IP"
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echo "# Modified by hwdsl2 VPN script" > "$IPT_FILE"
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iptables-save >> "$IPT_FILE"
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fi
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print_status "Creating 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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[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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print_status "Enabling services on boot..."
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if grep -qs "release 6" /etc/redhat-release; then
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chkconfig iptables on
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chkconfig fail2ban on
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else
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systemctl --now mask firewalld 2>/dev/null
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systemctl enable iptables fail2ban 2>/dev/null
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fi
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if ! grep -qs "hwdsl2 VPN script" /etc/rc.local; then
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if [ -f /etc/rc.local ]; then
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conf_bk "/etc/rc.local"
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else
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echo '#!/bin/sh' > /etc/rc.local
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fi
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cat >> /etc/rc.local <<'EOF'
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# Added by hwdsl2 VPN script
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modprobe -q pppol2tp
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service ipsec restart
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service xl2tpd restart
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echo 1 > /proc/sys/net/ipv4/ip_forward
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EOF
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fi
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print_status "Starting services..."
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# Restore SELinux contexts
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restorecon /etc/ipsec.d/*db 2>/dev/null
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restorecon /usr/local/sbin -Rv 2>/dev/null
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restorecon /usr/local/libexec/ipsec -Rv 2>/dev/null
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# Reload sysctl.conf
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sysctl -e -q -p
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# Update file attributes
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chmod +x /etc/rc.local
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chmod 600 /etc/ipsec.secrets* /etc/ppp/chap-secrets* /etc/ipsec.d/passwd*
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# Apply new IPTables rules
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iptables-restore < "$IPT_FILE"
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# Restart services
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modprobe -q pppol2tp
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service fail2ban restart 2>/dev/null
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service ipsec restart 2>/dev/null
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service xl2tpd restart 2>/dev/null
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cat <<EOF
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================================================
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IPsec VPN server is now ready for use!
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Connect to your new VPN with these details:
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Server IP: $PUBLIC_IP
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IPsec PSK: $VPN_IPSEC_PSK
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|
Username: $VPN_USER
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|
Password: $VPN_PASSWORD
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|
|
|
Write these down. You'll need them to connect!
|
|
|
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Important notes: https://git.io/vpnnotes
|
|
Setup VPN clients: https://git.io/vpnclients
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|
|
|
================================================
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|
|
|
EOF
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|
exit 0
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