Это старая версия документа!
wget https://git.io/vpn -O openvpn-install.sh sudo bash ./openvpn-install.sh
Текущее содержимое скрипта:
#!/bin/bash
#
# https://github.com/Nyr/openvpn-install
#
# Copyright © 2013 Nyr. Released under the MIT License.
# Detect Debian users running the script with «sh» instead of bash
if readlink /proc/$$/exe | grep -q «dash»; then
echo 'This installer needs to be run with «bash», not «sh».'
exit
fi
# Discard stdin. Needed when running from an one-liner which includes a newline
read -N 999999 -t 0.001
# Detect OpenVZ 6
if cut -d "." -f 1) -eq 2 ; then
echo «The system is running an old kernel, which is incompatible with this installer.»
exit
fi
# Detect OS
# $os_version variables aren't always in use, but are kept here for convenience
if grep -qs «ubuntu» /etc/os-release; then
os=«ubuntu»
os_version=$(grep 'VERSION_ID' /etc/os-release | cut -d '«' -f 2 | tr -d '.')
group_name=«nogroup»
elif -e /etc/debian_version; then
os=«debian»
os_version=$(grep -oE '[0-9]+' /etc/debian_version | head -1)
group_name=«nogroup»
elif | -e /etc/rocky-release || -e /etc/centos-release ; then
os=«centos»
os_version=$(grep -shoE '[0-9]+' /etc/almalinux-release /etc/rocky-release /etc/centos-release | head -1)
group_name=«nobody»
elif -e /etc/fedora-release; then
os=«fedora»
os_version=$(grep -oE '[0-9]+' /etc/fedora-release | head -1)
group_name=«nobody»
else
echo «This installer seems to be running on an unsupported distribution.
Supported distros are Ubuntu, Debian, AlmaLinux, Rocky Linux, CentOS and Fedora.»
exit
fi
if "$os" == "ubuntu" && "$os_version" -lt 1804; then
echo «Ubuntu 18.04 or higher is required to use this installer.
This version of Ubuntu is too old and unsupported.»
exit
fi
if "$os" == "debian" && "$os_version" -lt 9; then
echo «Debian 9 or higher is required to use this installer.
This version of Debian is too old and unsupported.»
exit
fi
if "$os" == "centos" && "$os_version" -lt 7; then
echo «CentOS 7 or higher is required to use this installer.
This version of CentOS is too old and unsupported.»
exit
fi
# Detect environments where $PATH does not include the sbin directories
if ! grep -q sbin «< «$PATH»; then
echo '$PATH does not include sbin. Try using «su -» instead of «su».'
exit
fi
if "$EUID" -ne 0; then
echo «This installer needs to be run with superuser privileges.»
exit
fi
if ! -e /dev/net/tun || ! ( exec 7<>/dev/net/tun ) 2>/dev/null; then
echo «The system does not have the TUN device available.
TUN needs to be enabled before running this installer.»
exit
fi
new_client () {
# Generates the custom client.ovpn
{
cat /etc/openvpn/server/client-common.txt
echo »<ca>«
cat /etc/openvpn/server/easy-rsa/pki/ca.crt
echo »</ca>«
echo »<cert>«
sed -ne '/BEGIN CERTIFICATE/,$ p' /etc/openvpn/server/easy-rsa/pki/issued/«$client».crt
echo »</cert>«
echo »<key>«
cat /etc/openvpn/server/easy-rsa/pki/private/«$client».key
echo »</key>«
echo »<tls-crypt>«
sed -ne '/BEGIN OpenVPN Static key/,$ p' /etc/openvpn/server/tc.key
echo »</tls-crypt>«
} > ~/«$client».ovpn
}
if ! -e /etc/openvpn/server/server.conf; then
# Detect some Debian minimal setups where neither wget nor curl are installed
if ! hash wget 2>/dev/null && ! hash curl 2>/dev/null; then
echo «Wget is required to use this installer.»
read -n1 -r -p «Press any key to install Wget and continue…»
apt-get update
apt-get install -y wget
fi
clear
echo 'Welcome to this OpenVPN road warrior installer!'
# If system has a single IPv4, it is selected automatically. Else, ask the user
if grep inet | grep -vEc '127(\.[0-9]{1,3}){3}') -eq 1 ; then
ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}')
else
number_of_ip=$(ip -4 addr | grep inet | grep -vEc '127(\.[0-9]{1,3}){3}')
echo
echo «Which IPv4 address should be used?»
ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | nl -s ') '
read -p «IPv4 address [1]: » ip_number
until | "$ip_number" =~ ^[0-9]+$ && "$ip_number" -le "$number_of_ip" ; do
echo «$ip_number: invalid selection.»
read -p «IPv4 address [1]: » ip_number
done
-z "$ip_number" && ip_number=«1»
ip=$(ip -4 addr | grep inet | grep -vE '127(\.[0-9]{1,3}){3}' | cut -d '/' -f 1 | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | sed -n «$ip_number»p)
fi
# If $ip is a private IP address, the server must be behind NAT
if echo «$ip» | grep -qE '^(10\.|172\.1[6789]\.|172\.2[0-9]\.|172\.3[01]\.|192\.168)'; then
echo
echo «This server is behind NAT. What is the public IPv4 address or hostname?»
# Get public IP and sanitize with grep
get_public_ip=$(grep -m 1 -oE '^[0-9]{1,3}(\.[0-9]{1,3}){3}$' «< «$(wget -T 10 -t 1 -4qO- «http://ip1.dynupdate.no-ip.com/» || curl -m 10 -4Ls «http://ip1.dynupdate.no-ip.com/»)»)
read -p «Public IPv4 address / hostname [$get_public_ip]: » public_ip
# If the checkip service is unavailable and user didn't provide input, ask again
until | -n "$public_ip" ; do
echo «Invalid input.»
read -p «Public IPv4 address / hostname: » public_ip
done
-z "$public_ip" && public_ip=«$get_public_ip»
fi
# If system has a single IPv6, it is selected automatically
if grep -c 'inet6 [23]') -eq 1 ; then
ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}')
fi
# If system has multiple IPv6, ask the user to select one
if grep -c 'inet6 [23]') -gt 1 ; then
number_of_ip6=$(ip -6 addr | grep -c 'inet6 [23]')
echo
echo «Which IPv6 address should be used?»
ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | nl -s ') '
read -p «IPv6 address [1]: » ip6_number
until | "$ip6_number" =~ ^[0-9]+$ && "$ip6_number" -le "$number_of_ip6" ; do
echo «$ip6_number: invalid selection.»
read -p «IPv6 address [1]: » ip6_number
done
-z "$ip6_number" && ip6_number=«1»
ip6=$(ip -6 addr | grep 'inet6 [23]' | cut -d '/' -f 1 | grep -oE '([0-9a-fA-F]{0,4}:){1,7}[0-9a-fA-F]{0,4}' | sed -n «$ip6_number»p)
fi
echo
echo «Which protocol should OpenVPN use?»
echo » 1) UDP (recommended)«
echo » 2) TCP«
read -p «Protocol [1]: » protocol
until | "$protocol" =~ ^[12]$ ; do
echo «$protocol: invalid selection.»
read -p «Protocol [1]: » protocol
done
case «$protocol» in
1|»«)
protocol=udp
;;
2)
protocol=tcp
;;
esac
echo
echo «What port should OpenVPN listen to?»
read -p «Port [1194]: » port
until | "$port" =~ ^[0-9]+$ && "$port" -le 65535 ; do
echo «$port: invalid port.»
read -p «Port [1194]: » port
done
-z "$port" && port=«1194»
echo
echo «Select a DNS server for the clients:»
echo » 1) Current system resolvers«
echo » 2) Google«
echo » 3) 1.1.1.1«
echo » 4) OpenDNS«
echo » 5) Quad9«
echo » 6) AdGuard«
read -p «DNS server [1]: » dns
until | "$dns" =~ ^[1-6]$ ; do
echo «$dns: invalid selection.»
read -p «DNS server [1]: » dns
done
echo
echo «Enter a name for the first client:»
read -p «Name [client]: » unsanitized_client
# Allow a limited set of characters to avoid conflicts
client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' «< «$unsanitized_client»)
-z "$client" && client=«client»
echo
echo «OpenVPN installation is ready to begin.»
# Install a firewall if firewalld or iptables are not already available
if ! systemctl is-active –quiet firewalld.service && ! hash iptables 2>/dev/null; then
if | "$os" == "fedora" ; then
firewall=«firewalld»
# We don't want to silently enable firewalld, so we give a subtle warning
# If the user continues, firewalld will be installed and enabled during setup
echo «firewalld, which is required to manage routing tables, will also be installed.»
elif | "$os" == "ubuntu" ; then
# iptables is way less invasive than firewalld so no warning is given
firewall=«iptables»
fi
fi
read -n1 -r -p «Press any key to continue…»
# If running inside a container, disable LimitNPROC to prevent conflicts
if systemd-detect-virt -cq; then
mkdir /etc/systemd/system/openvpn-server@server.service.d/ 2>/dev/null
echo »[Service]
LimitNPROC=infinity« > /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
fi
if | "$os" = "ubuntu" ; then
apt-get update
apt-get install -y openvpn openssl ca-certificates $firewall
elif "$os" = "centos"; then
yum install -y epel-release
yum install -y openvpn openssl ca-certificates tar $firewall
else
# Else, OS must be Fedora
dnf install -y openvpn openssl ca-certificates tar $firewall
fi
# If firewalld was just installed, enable it
if "$firewall" == "firewalld"; then
systemctl enable –now firewalld.service
fi
# Get easy-rsa
easy_rsa_url='https://github.com/OpenVPN/easy-rsa/releases/download/v3.0.8/EasyRSA-3.0.8.tgz'
mkdir -p /etc/openvpn/server/easy-rsa/
{ wget -qO- «$easy_rsa_url» 2>/dev/null || curl -sL «$easy_rsa_url» ; } | tar xz -C /etc/openvpn/server/easy-rsa/ –strip-components 1
chown -R root:root /etc/openvpn/server/easy-rsa/
cd /etc/openvpn/server/easy-rsa/
# Create the PKI, set up the CA and the server and client certificates
./easyrsa init-pki
./easyrsa –batch build-ca nopass
EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-server-full server nopass
EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full «$client» nopass
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
# Move the stuff we need
cp pki/ca.crt pki/private/ca.key pki/issued/server.crt pki/private/server.key pki/crl.pem /etc/openvpn/server
# CRL is read with each client connection, while OpenVPN is dropped to nobody
chown nobody:«$group_name» /etc/openvpn/server/crl.pem
# Without +x in the directory, OpenVPN can't run a stat() on the CRL file
chmod o+x /etc/openvpn/server/
# Generate key for tls-crypt
openvpn –genkey –secret /etc/openvpn/server/tc.key
# Create the DH parameters file using the predefined ffdhe2048 group
echo '—–BEGIN DH PARAMETERS—–
MIIBCAKCAQEA+t+FRYortKmq/cViAnPTzx2LnFg84tNpWp4TZBFGQz
+8yTnc4kmz75fS/jY2MMddj2gbICrsRhetPfHtXV/WVhJDP1H18GbtCFY2VVPe0a
87VXE15/V8k1mE8McODmi3fipona8+/och3xWKE2rec1MKzKT0g6eXq8CrGCsyT7
YdEIqUuyyOP7uWrat2DX9GgdT0Kj3jlN9K5W7edjcrsZCwenyO4KbXCeAvzhzffi
7MA0BM0oNC9hkXL+nOmFg/+OTxIy7vKBg8P+OxtMb61zO7X8vC7CIAXFjvGDfRaD
ssbzSibBsu/6iGtCOGEoXJfwIBAg==
—–END DH PARAMETERS—–' > /etc/openvpn/server/dh.pem
# Generate server.conf
echo «local $ip
port $port
proto $protocol
dev tun
ca ca.crt
cert server.crt
key server.key
dh dh.pem
auth SHA512
tls-crypt tc.key
topology subnet
server 10.8.0.0 255.255.255.0» > /etc/openvpn/server/server.conf
# IPv6
if -z "$ip6"; then
echo 'push «redirect-gateway def1 bypass-dhcp»' » /etc/openvpn/server/server.conf
else
echo 'server-ipv6 fddd:1194:1194:1194::/64' » /etc/openvpn/server/server.conf
echo 'push «redirect-gateway def1 ipv6 bypass-dhcp»' » /etc/openvpn/server/server.conf
fi
echo 'ifconfig-pool-persist ipp.txt' » /etc/openvpn/server/server.conf
# DNS
case «$dns» in
1|»«)
# Locate the proper resolv.conf
# Needed for systems running systemd-resolved
if grep -q '^nameserver 127.0.0.53' »/etc/resolv.conf«; then
resolv_conf=»/run/systemd/resolve/resolv.conf«
else
resolv_conf=»/etc/resolv.conf«
fi
# Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '^#\|^;' «$resolv_conf» | grep '^nameserver' | grep -oE '[0-9]{1,3}(\.[0-9]{1,3}){3}' | while read line; do
echo «push \»dhcp-option DNS $line\»« » /etc/openvpn/server/server.conf
done
;;
2)
echo 'push «dhcp-option DNS 8.8.8.8»' » /etc/openvpn/server/server.conf
echo 'push «dhcp-option DNS 8.8.4.4»' » /etc/openvpn/server/server.conf
;;
3)
echo 'push «dhcp-option DNS 1.1.1.1»' » /etc/openvpn/server/server.conf
echo 'push «dhcp-option DNS 1.0.0.1»' » /etc/openvpn/server/server.conf
;;
4)
echo 'push «dhcp-option DNS 208.67.222.222»' » /etc/openvpn/server/server.conf
echo 'push «dhcp-option DNS 208.67.220.220»' » /etc/openvpn/server/server.conf
;;
5)
echo 'push «dhcp-option DNS 9.9.9.9»' » /etc/openvpn/server/server.conf
echo 'push «dhcp-option DNS 149.112.112.112»' » /etc/openvpn/server/server.conf
;;
6)
echo 'push «dhcp-option DNS 94.140.14.14»' » /etc/openvpn/server/server.conf
echo 'push «dhcp-option DNS 94.140.15.15»' » /etc/openvpn/server/server.conf
;;
esac
echo «keepalive 10 120
cipher AES-256-CBC
user nobody
group $group_name
persist-key
persist-tun
verb 3
crl-verify crl.pem» » /etc/openvpn/server/server.conf
if "$protocol" = "udp"; then
echo «explicit-exit-notify» » /etc/openvpn/server/server.conf
fi
# Enable net.ipv4.ip_forward for the system
echo 'net.ipv4.ip_forward=1' > /etc/sysctl.d/99-openvpn-forward.conf
# Enable without waiting for a reboot or service restart
echo 1 > /proc/sys/net/ipv4/ip_forward
if -n "$ip6"; then
# Enable net.ipv6.conf.all.forwarding for the system
echo «net.ipv6.conf.all.forwarding=1» » /etc/sysctl.d/99-openvpn-forward.conf
# Enable without waiting for a reboot or service restart
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
fi
if systemctl is-active –quiet firewalld.service; then
# Using both permanent and not permanent rules to avoid a firewalld
# reload.
# We don't use –add-service=openvpn because that would only work with
# the default port and protocol.
firewall-cmd –add-port=«$port»/«$protocol»
firewall-cmd –zone=trusted –add-source=10.8.0.0/24
firewall-cmd –permanent –add-port=«$port»/«$protocol»
firewall-cmd –permanent –zone=trusted –add-source=10.8.0.0/24
# Set NAT for the VPN subnet
firewall-cmd –direct –add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to «$ip»
firewall-cmd –permanent –direct –add-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to «$ip»
if -n "$ip6"; then
firewall-cmd –zone=trusted –add-source=fddd:1194:1194:1194::/64
firewall-cmd –permanent –zone=trusted –add-source=fddd:1194:1194:1194::/64
firewall-cmd –direct –add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to «$ip6»
firewall-cmd –permanent –direct –add-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to «$ip6»
fi
else
# Create a service to set up persistent iptables rules
iptables_path=$(command -v iptables)
ip6tables_path=$(command -v ip6tables)
# nf_tables is not available as standard in OVZ kernels. So use iptables-legacy
# if we are in OVZ, with a nf_tables backend and iptables-legacy is available.
if $(systemd-detect-virt) == "openvz" && readlink -f «$(command -v iptables)» | grep -q «nft» && hash iptables-legacy 2>/dev/null; then
iptables_path=$(command -v iptables-legacy)
ip6tables_path=$(command -v ip6tables-legacy)
fi
echo »[Unit]
Before=network.target
[Service]
Type=oneshot
ExecStart=$iptables_path -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to $ip
ExecStart=$iptables_path -I INPUT -p $protocol –dport $port -j ACCEPT
ExecStart=$iptables_path -I FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStart=$iptables_path -I FORWARD -m state –state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$iptables_path -t nat -D POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to $ip
ExecStop=$iptables_path -D INPUT -p $protocol –dport $port -j ACCEPT
ExecStop=$iptables_path -D FORWARD -s 10.8.0.0/24 -j ACCEPT
ExecStop=$iptables_path -D FORWARD -m state –state RELATED,ESTABLISHED -j ACCEPT« > /etc/systemd/system/openvpn-iptables.service
if -n "$ip6"; then
echo «ExecStart=$ip6tables_path -t nat -A POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to $ip6
ExecStart=$ip6tables_path -I FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
ExecStart=$ip6tables_path -I FORWARD -m state –state RELATED,ESTABLISHED -j ACCEPT
ExecStop=$ip6tables_path -t nat -D POSTROUTING -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to $ip6
ExecStop=$ip6tables_path -D FORWARD -s fddd:1194:1194:1194::/64 -j ACCEPT
ExecStop=$ip6tables_path -D FORWARD -m state –state RELATED,ESTABLISHED -j ACCEPT» » /etc/systemd/system/openvpn-iptables.service
fi
echo «RemainAfterExit=yes
[Install]
WantedBy=multi-user.target» » /etc/systemd/system/openvpn-iptables.service
systemctl enable –now openvpn-iptables.service
fi
# If SELinux is enabled and a custom port was selected, we need this
if sestatus 2>/dev/null | grep «Current mode» | grep -q «enforcing» && "$port" != 1194; then
# Install semanage if not already present
if ! hash semanage 2>/dev/null; then
if "$os_version" -eq 7; then
# Centos 7
yum install -y policycoreutils-python
else
# CentOS 8 or Fedora
dnf install -y policycoreutils-python-utils
fi
fi
semanage port -a -t openvpn_port_t -p «$protocol» «$port»
fi
# If the server is behind NAT, use the correct IP address
-n "$public_ip" && ip=«$public_ip»
# client-common.txt is created so we have a template to add further users later
echo «client
dev tun
proto $protocol
remote $ip $port
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
auth SHA512
cipher AES-256-CBC
ignore-unknown-option block-outside-dns
block-outside-dns
verb 3» > /etc/openvpn/server/client-common.txt
# Enable and start the OpenVPN service
systemctl enable –now openvpn-server@server.service
# Generates the custom client.ovpn
new_client
echo
echo «Finished!»
echo
echo «The client configuration is available in:» ~/«$client.ovpn»
echo «New clients can be added by running this script again.»
else
clear
echo «OpenVPN is already installed.»
echo
echo «Select an option:»
echo » 1) Add a new client«
echo » 2) Revoke an existing client«
echo » 3) Remove OpenVPN«
echo » 4) Exit«
read -p «Option: » option
until "$option" =~ ^[1-4]$; do
echo «$option: invalid selection.»
read -p «Option: » option
done
case «$option» in
1)
echo
echo «Provide a name for the client:»
read -p «Name: » unsanitized_client
client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' «< «$unsanitized_client»)
while | -e /etc/openvpn/server/easy-rsa/pki/issued/"$client".crt ; do
echo «$client: invalid name.»
read -p «Name: » unsanitized_client
client=$(sed 's/[^0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-]/_/g' «< «$unsanitized_client»)
done
cd /etc/openvpn/server/easy-rsa/
EASYRSA_CERT_EXPIRE=3650 ./easyrsa build-client-full «$client» nopass
# Generates the custom client.ovpn
new_client
echo
echo «$client added. Configuration available in:» ~/«$client.ovpn»
exit
;;
2)
# This option could be documented a bit better and maybe even be simplified
# …but what can I say, I want some sleep too
number_of_clients=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep -c «^V»)
if "$number_of_clients" = 0; then
echo
echo «There are no existing clients!»
exit
fi
echo
echo «Select the client to revoke:»
tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep «^V» | cut -d '=' -f 2 | nl -s ') '
read -p «Client: » client_number
until "$client_number" =~ ^[0-9]+$ && "$client_number" -le "$number_of_clients"; do
echo «$client_number: invalid selection.»
read -p «Client: » client_number
done
client=$(tail -n +2 /etc/openvpn/server/easy-rsa/pki/index.txt | grep «^V» | cut -d '=' -f 2 | sed -n «$client_number»p)
echo
read -p «Confirm $client revocation? [y/N]: » revoke
until "$revoke" =~ ^[yYnN]*$; do
echo «$revoke: invalid selection.»
read -p «Confirm $client revocation? [y/N]: » revoke
done
if "$revoke" =~ ^[yY]$; then
cd /etc/openvpn/server/easy-rsa/
./easyrsa –batch revoke «$client»
EASYRSA_CRL_DAYS=3650 ./easyrsa gen-crl
rm -f /etc/openvpn/server/crl.pem
cp /etc/openvpn/server/easy-rsa/pki/crl.pem /etc/openvpn/server/crl.pem
# CRL is read with each client connection, when OpenVPN is dropped to nobody
chown nobody:«$group_name» /etc/openvpn/server/crl.pem
echo
echo «$client revoked!»
else
echo
echo «$client revocation aborted!»
fi
exit
;;
3)
echo
read -p «Confirm OpenVPN removal? [y/N]: » remove
until "$remove" =~ ^[yYnN]*$; do
echo «$remove: invalid selection.»
read -p «Confirm OpenVPN removal? [y/N]: » remove
done
if "$remove" =~ ^[yY]$; then
port=$(grep '^port ' /etc/openvpn/server/server.conf | cut -d » « -f 2)
protocol=$(grep '^proto ' /etc/openvpn/server/server.conf | cut -d » « -f 2)
if systemctl is-active –quiet firewalld.service; then
ip=$(firewall-cmd –direct –get-rules ipv4 nat POSTROUTING | grep '\-s 10.8.0.0/24 '»'«'!'»'«' -d 10.8.0.0/24' | grep -oE '[^ ]+$')
# Using both permanent and not permanent rules to avoid a firewalld reload.
firewall-cmd –remove-port=«$port»/«$protocol»
firewall-cmd –zone=trusted –remove-source=10.8.0.0/24
firewall-cmd –permanent –remove-port=«$port»/«$protocol»
firewall-cmd –permanent –zone=trusted –remove-source=10.8.0.0/24
firewall-cmd –direct –remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to «$ip»
firewall-cmd –permanent –direct –remove-rule ipv4 nat POSTROUTING 0 -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT –to «$ip»
if grep -qs «server-ipv6» /etc/openvpn/server/server.conf; then
ip6=$(firewall-cmd –direct –get-rules ipv6 nat POSTROUTING | grep '\-s fddd:1194:1194:1194::/64 '»'«'!'»'«' -d fddd:1194:1194:1194::/64' | grep -oE '[^ ]+$')
firewall-cmd –zone=trusted –remove-source=fddd:1194:1194:1194::/64
firewall-cmd –permanent –zone=trusted –remove-source=fddd:1194:1194:1194::/64
firewall-cmd –direct –remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to «$ip6»
firewall-cmd –permanent –direct –remove-rule ipv6 nat POSTROUTING 0 -s fddd:1194:1194:1194::/64 ! -d fddd:1194:1194:1194::/64 -j SNAT –to «$ip6»
fi
else
systemctl disable –now openvpn-iptables.service
rm -f /etc/systemd/system/openvpn-iptables.service
fi
if sestatus 2>/dev/null | grep «Current mode» | grep -q «enforcing» && "$port" != 1194; then
semanage port -d -t openvpn_port_t -p «$protocol» «$port»
fi
systemctl disable –now openvpn-server@server.service
rm -f /etc/systemd/system/openvpn-server@server.service.d/disable-limitnproc.conf
rm -f /etc/sysctl.d/99-openvpn-forward.conf
if | "$os" = "ubuntu" ; then
rm -rf /etc/openvpn/server
apt-get remove –purge -y openvpn
else
# Else, OS must be CentOS or Fedora
yum remove -y openvpn
rm -rf /etc/openvpn/server
fi
echo
echo «OpenVPN removed!»
else
echo
echo «OpenVPN removal aborted!»
fi
exit
;;
4)
exit
;;
esac
fi