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simono41 2017-11-13 07:21:19 -05:00
parent fe6bd5a25c
commit fa17299d06
1 changed files with 94 additions and 58 deletions
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134
openvpn-install.sh
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@ -1,7 +1,5 @@
#!/bin/bash #!/bin/bash
set -ex
# Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux # Secure OpenVPN server installer for Debian, Ubuntu, CentOS and Arch Linux
# https://github.com/Angristan/OpenVPN-install # https://github.com/Angristan/OpenVPN-install
@ -25,7 +23,7 @@ if [[ -e /etc/debian_version ]]; then
OS="debian" OS="debian"
# Getting the version number, to verify that a recent version of OpenVPN is available # Getting the version number, to verify that a recent version of OpenVPN is available
VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID") VERSION_ID=$(cat /etc/os-release | grep "VERSION_ID")
RCLOCAL='/etc/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.conf' SYSCTL='/etc/sysctl.conf'
if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then if [[ "$VERSION_ID" != 'VERSION_ID="7"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="8"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="9"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="12.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="14.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.04"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="16.10"' ]] && [[ "$VERSION_ID" != 'VERSION_ID="17.04"' ]]; then
echo "Your version of Debian/Ubuntu is not supported." echo "Your version of Debian/Ubuntu is not supported."
@ -44,13 +42,11 @@ if [[ -e /etc/debian_version ]]; then
fi fi
elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then elif [[ -e /etc/centos-release || -e /etc/redhat-release ]]; then
OS=centos OS=centos
RCLOCAL='/etc/rc.d/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.conf' SYSCTL='/etc/sysctl.conf'
# Needed for CentOS 7
chmod +x /etc/rc.d/rc.local
elif [[ -e /etc/arch-release ]]; then elif [[ -e /etc/arch-release ]]; then
OS=arch OS=arch
RCLOCAL='/etc/rc.local' IPTABLES='/etc/iptables/iptables.rules'
SYSCTL='/etc/sysctl.d/openvpn.conf' SYSCTL='/etc/sysctl.d/openvpn.conf'
else else
echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system" echo "Looks like you aren't running this installer on a Debian, Ubuntu, CentOS or ArchLinux system"
@ -91,7 +87,7 @@ if [[ "$IP" = "" ]]; then
IP=$(wget -qO- ipv4.icanhazip.com) IP=$(wget -qO- ipv4.icanhazip.com)
fi fi
# Get Internet network interface with default route # Get Internet network interface with default route
NIC=$(ip -4 route ls | grep default -m 1 | grep -Po '(?<=dev )(\S+)') NIC=$(ip -4 route ls | grep default -m 1 | grep -Po '(?<=dev )(\S+)' | head -1)
if [[ -e /etc/openvpn/server.conf ]]; then if [[ -e /etc/openvpn/server.conf ]]; then
while : while :
@ -164,11 +160,16 @@ if [[ -e /etc/openvpn/server.conf ]]; then
firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24 firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
fi fi
if iptables -L -n | grep -qE 'REJECT|DROP'; then if iptables -L -n | grep -qE 'REJECT|DROP'; then
sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL if [[ "$PROTOCOL" = 'udp' ]]; then
sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL iptables -D INPUT -p udp --dport $PORT -j ACCEPT
sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL else
iptables -D INPUT -p tcp --dport $PORT -j ACCEPT
fi fi
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL iptables -D FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables-save > $IPTABLES
fi
iptables -t nat -D POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
iptables-save > $IPTABLES
if hash sestatus 2>/dev/null; then if hash sestatus 2>/dev/null; then
if sestatus | grep "Current mode" | grep -qs "enforcing"; then if sestatus | grep "Current mode" | grep -qs "enforcing"; then
if [[ "$PORT" != '1194' ]]; then if [[ "$PORT" != '1194' ]]; then
@ -349,9 +350,73 @@ else
# Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository. # Ubuntu >= 16.04 and Debian > 8 have OpenVPN > 2.3.3 without the need of a third party repository.
# The we install OpenVPN # The we install OpenVPN
apt-get install openvpn iptables openssl wget ca-certificates curl -y apt-get install openvpn iptables openssl wget ca-certificates curl -y
# Install iptables service
if [[ ! -e /etc/systemd/system/iptables.service ]]; then
mkdir /etc/iptables
iptables-save > /etc/iptables/iptables.rules
echo "#!/bin/sh
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
chmod +x /etc/iptables/flush-iptables.sh
echo "[Unit]
Description=Packet Filtering Framework
DefaultDependencies=no
Before=network-pre.target
Wants=network-pre.target
[Service]
Type=oneshot
ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecStop=/etc/iptables/flush-iptables.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
systemctl daemon-reload
systemctl enable iptables.service
fi
elif [[ "$OS" = 'centos' ]]; then elif [[ "$OS" = 'centos' ]]; then
yum install epel-release -y yum install epel-release -y
yum install openvpn iptables openssl wget ca-certificates curl -y yum install openvpn iptables openssl wget ca-certificates curl -y
# Install iptables service
if [[ ! -e /etc/systemd/system/iptables.service ]]; then
mkdir /etc/iptables
iptables-save > /etc/iptables/iptables.rules
echo "#!/bin/sh
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT" > /etc/iptables/flush-iptables.sh
chmod +x /etc/iptables/flush-iptables.sh
echo "[Unit]
Description=Packet Filtering Framework
DefaultDependencies=no
Before=network-pre.target
Wants=network-pre.target
[Service]
Type=oneshot
ExecStart=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecReload=/sbin/iptables-restore /etc/iptables/iptables.rules
ExecStop=/etc/iptables/flush-iptables.sh
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/iptables.service
systemctl daemon-reload
systemctl enable iptables.service
# Disable firewalld to allow iptables to start upon reboot
systemctl disable firewalld
fi
else else
# Else, the distro is ArchLinux # Else, the distro is ArchLinux
echo "" echo ""
@ -369,29 +434,10 @@ else
fi fi
if [[ "$OS" = 'arch' ]]; then if [[ "$OS" = 'arch' ]]; then
# Install rc.local
echo "[Unit]
Description=/etc/rc.local compatibility
[Service]
Type=oneshot
ExecStart=/etc/rc.local
RemainAfterExit=yes
[Install]
WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
touch /etc/rc.local
chmod +x /etc/rc.local
systemctl enable rc-local.service
if ! grep '#!' $RCLOCAL; then
echo "#!/bin/bash" > $RCLOCAL
fi
fi
# Install dependencies # Install dependencies
pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm pacman -Syu openvpn iptables openssl wget ca-certificates curl --needed --noconfirm
if [[ "$OS" = 'arch' ]]; then iptables-save > /etc/iptables/iptables.rules # iptables won't start if this file does not exist
touch /etc/iptables/iptables.rules # iptables won't start if this file does not exist systemctl daemon-reload
systemctl enable iptables systemctl enable iptables
systemctl start iptables systemctl start iptables
fi fi
@ -431,8 +477,7 @@ WantedBy=multi-user.target" > /etc/systemd/system/rc-local.service
chmod 644 /etc/openvpn/crl.pem chmod 644 /etc/openvpn/crl.pem
# Generate server.conf # Generate server.conf
echo "local $IP" > /etc/openvpn/server.conf echo "port $PORT" > /etc/openvpn/server.conf
echo "port $PORT" >> /etc/openvpn/server.conf
if [[ "$PROTOCOL" = 'UDP' ]]; then if [[ "$PROTOCOL" = 'UDP' ]]; then
echo "proto udp" >> /etc/openvpn/server.conf echo "proto udp" >> /etc/openvpn/server.conf
elif [[ "$PROTOCOL" = 'TCP' ]]; then elif [[ "$PROTOCOL" = 'TCP' ]]; then
@ -507,15 +552,10 @@ verb 3" >> /etc/openvpn/server.conf
fi fi
# Avoid an unneeded reboot # Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/ip_forward
# Needed to use rc.local with some systemd distros
if [[ "$OS" = 'debian' && ! -e $RCLOCAL ]]; then
echo '#!/bin/sh -e
exit 0' > $RCLOCAL
fi
chmod +x $RCLOCAL
# Set NAT for the VPN subnet # Set NAT for the VPN subnet
iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE
sed -i "1 a\iptables -t nat -A POSTROUTING -o $NIC -s 10.8.0.0/24 -j MASQUERADE" $RCLOCAL # Save persitent iptables rules
iptables-save > $IPTABLES
if pgrep firewalld; then if pgrep firewalld; then
# We don't use --add-service=openvpn because that would only work with # We don't use --add-service=openvpn because that would only work with
# the default port. Using both permanent and not permanent rules to # the default port. Using both permanent and not permanent rules to
@ -541,13 +581,8 @@ verb 3" >> /etc/openvpn/server.conf
fi fi
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
if [[ "$PROTOCOL" = 'UDP' ]]; then # Save persitent OpenVPN rules
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL iptables-save > $IPTABLES
elif [[ "$PROTOCOL" = 'TCP' ]]; then
sed -i "1 a\iptables -I INPUT -p tcp --dport $PORT -j ACCEPT" $RCLOCAL
fi
sed -i "1 a\iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT" $RCLOCAL
sed -i "1 a\iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT" $RCLOCAL
fi fi
# If SELinux is enabled and a custom port was selected, we need this # If SELinux is enabled and a custom port was selected, we need this
if hash sestatus 2>/dev/null; then if hash sestatus 2>/dev/null; then
@ -630,6 +665,7 @@ persist-key
persist-tun persist-tun
remote-cert-tls server remote-cert-tls server
auth SHA256 auth SHA256
auth-nocache
$CIPHER $CIPHER
tls-client tls-client
tls-version-min 1.2 tls-version-min 1.2