Bernhard.Linz/openvpn-install
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The BIG commit

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- Upgrade to easy-rsa 3.0.0
- Firewall support: rules are added for both FirewallD and iptables if
needed.
- Creation of our own configuration files for both the server and
clients.
- Using subnet topology instead of the deprecated net30.
- Removed port 53 question during install: user can just choose that
port during setup.
- Removed internal networking option: this is a road warrior installer
after all.
- Bugfix: the default easy-rsa directory was not correctly deleted if
one was already there.
This commit is contained in:
Nyr 2015-09-12 21:48:08 +02:00
parent abe2ac44b1
commit eb8d8257a0
1 changed files with 118 additions and 111 deletions
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229
openvpn-install.sh
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@ -39,19 +39,16 @@ else
fi fi
newclient () { newclient () {
# Generates the client.ovpn # Generates the custom client.ovpn
cp /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf ~/$1.ovpn cp /etc/openvpn/client-common.txt ~/$1.ovpn
sed -i "/ca ca.crt/d" ~/$1.ovpn
sed -i "/cert client.crt/d" ~/$1.ovpn
sed -i "/key client.key/d" ~/$1.ovpn
echo "<ca>" >> ~/$1.ovpn echo "<ca>" >> ~/$1.ovpn
cat /etc/openvpn/easy-rsa/2.0/keys/ca.crt >> ~/$1.ovpn cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
echo "</ca>" >> ~/$1.ovpn echo "</ca>" >> ~/$1.ovpn
echo "<cert>" >> ~/$1.ovpn echo "<cert>" >> ~/$1.ovpn
cat /etc/openvpn/easy-rsa/2.0/keys/$1.crt >> ~/$1.ovpn cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
echo "</cert>" >> ~/$1.ovpn echo "</cert>" >> ~/$1.ovpn
echo "<key>" >> ~/$1.ovpn echo "<key>" >> ~/$1.ovpn
cat /etc/openvpn/easy-rsa/2.0/keys/$1.key >> ~/$1.ovpn cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
echo "</key>" >> ~/$1.ovpn echo "</key>" >> ~/$1.ovpn
} }
@ -83,13 +80,9 @@ if [[ -e /etc/openvpn/server.conf ]]; then
echo "Tell me a name for the client cert" echo "Tell me a name for the client cert"
echo "Please, use one word only, no special characters" echo "Please, use one word only, no special characters"
read -p "Client name: " -e -i client CLIENT read -p "Client name: " -e -i client CLIENT
cd /etc/openvpn/easy-rsa/2.0/ cd /etc/openvpn/easy-rsa/
source ./vars ./easyrsa build-client-full $CLIENT nopass
# build-key for the client # Generates the custom client.ovpn
export KEY_CN="$CLIENT"
export EASY_RSA="${EASY_RSA:-.}"
"$EASY_RSA/pkitool" $CLIENT
# Generate the client.ovpn
newclient "$CLIENT" newclient "$CLIENT"
echo "" echo ""
echo "Client $CLIENT added, certs available at ~/$CLIENT.ovpn" echo "Client $CLIENT added, certs available at ~/$CLIENT.ovpn"
@ -98,7 +91,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
2) 2)
# This option could be documented a bit better and maybe even be simplimplified # This option could be documented a bit better and maybe even be simplimplified
# ...but what can I say, I want some sleep too # ...but what can I say, I want some sleep too
NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep -c "^V") NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
if [[ "$NUMBEROFCLIENTS" = '0' ]]; then if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
echo "" echo ""
echo "You have no existing clients!" echo "You have no existing clients!"
@ -106,28 +99,24 @@ if [[ -e /etc/openvpn/server.conf ]]; then
fi fi
echo "" echo ""
echo "Select the existing client certificate you want to revoke" echo "Select the existing client certificate you want to revoke"
tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | cut -d '/' -f 7 | cut -d '=' -f 2 | nl -s ') ' tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
if [[ "$NUMBEROFCLIENTS" = '1' ]]; then if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
read -p "Select one client [1]: " CLIENTNUMBER read -p "Select one client [1]: " CLIENTNUMBER
else else
read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
fi fi
CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | cut -d '/' -f 7 | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p) CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
cd /etc/openvpn/easy-rsa/2.0/ cd /etc/openvpn/easy-rsa/
. /etc/openvpn/easy-rsa/2.0/vars ./easyrsa --batch revoke $CLIENT
. /etc/openvpn/easy-rsa/2.0/revoke-full $CLIENT ./easyrsa gen-crl
# If it's the first time revoking a cert, we need to add the crl-verify line # And restart
if ! grep -q "crl-verify" "/etc/openvpn/server.conf"; then if pgrep systemd-journal; then
echo "crl-verify /etc/openvpn/easy-rsa/2.0/keys/crl.pem" >> "/etc/openvpn/server.conf" systemctl restart openvpn@server.service
# And restart else
if pgrep systemd-journal; then if [[ "$OS" = 'debian' ]]; then
systemctl restart openvpn@server.service /etc/init.d/openvpn restart
else else
if [[ "$OS" = 'debian' ]]; then service openvpn restart
/etc/init.d/openvpn restart
else
service openvpn restart
fi
fi fi
fi fi
echo "" echo ""
@ -138,6 +127,20 @@ if [[ -e /etc/openvpn/server.conf ]]; then
echo "" echo ""
read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
if [[ "$REMOVE" = 'y' ]]; then if [[ "$REMOVE" = 'y' ]]; then
PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
if pgrep firewalld; then
# Using both permanent and not permanent rules to avoid a firewalld reload.
firewall-cmd --zone=public --remove-port=$PORT/udp
firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
fi
if iptables -L | grep -q REJECT; then
sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL
sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
fi
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
if [[ "$OS" = 'debian' ]]; then if [[ "$OS" = 'debian' ]]; then
apt-get remove --purge -y openvpn openvpn-blacklist apt-get remove --purge -y openvpn openvpn-blacklist
else else
@ -145,8 +148,6 @@ if [[ -e /etc/openvpn/server.conf ]]; then
fi fi
rm -rf /etc/openvpn rm -rf /etc/openvpn
rm -rf /usr/share/doc/openvpn* rm -rf /usr/share/doc/openvpn*
sed -i '/--dport 53 -j REDIRECT --to-port/d' $RCLOCAL
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0/d' $RCLOCAL
echo "" echo ""
echo "OpenVPN removed!" echo "OpenVPN removed!"
else else
@ -173,14 +174,6 @@ else
echo "What port do you want for OpenVPN?" echo "What port do you want for OpenVPN?"
read -p "Port: " -e -i 1194 PORT read -p "Port: " -e -i 1194 PORT
echo "" echo ""
echo "Do you want OpenVPN to be available at port 53 too?"
echo "This can be useful to connect under restrictive networks"
read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
echo ""
echo "Do you want to enable internal networking for the VPN?"
echo "This can allow VPN clients to communicate between them"
read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
echo ""
echo "What DNS do you want to use with the VPN?" echo "What DNS do you want to use with the VPN?"
echo " 1) Current system resolvers" echo " 1) Current system resolvers"
echo " 2) OpenDNS" echo " 2) OpenDNS"
@ -205,82 +198,73 @@ else
yum install openvpn iptables openssl wget -y yum install openvpn iptables openssl wget -y
fi fi
# An old version of easy-rsa was available by default in some openvpn packages # An old version of easy-rsa was available by default in some openvpn packages
if [[ -d /etc/openvpn/easy-rsa/2.0/ ]]; then if [[ -d /etc/openvpn/easy-rsa/ ]]; then
rm -f /etc/openvpn/easy-rsa/2.0/ rm -rf /etc/openvpn/easy-rsa/
fi fi
# Get easy-rsa # Get easy-rsa
wget --no-check-certificate -O ~/easy-rsa.tar.gz https://github.com/OpenVPN/easy-rsa/archive/2.2.2.tar.gz wget --no-check-certificate -O ~/EasyRSA-3.0.0.tgz https://github.com/OpenVPN/easy-rsa/releases/download/3.0.0/EasyRSA-3.0.0.tgz
tar xzf ~/easy-rsa.tar.gz -C ~/ tar xzf ~/EasyRSA-3.0.0.tgz -C ~/
mkdir -p /etc/openvpn/easy-rsa/2.0/ mv ~/EasyRSA-3.0.0/ /etc/openvpn/
cp ~/easy-rsa-2.2.2/easy-rsa/2.0/* /etc/openvpn/easy-rsa/2.0/ mv /etc/openvpn/EasyRSA-3.0.0/ /etc/openvpn/easy-rsa/
rm -rf ~/easy-rsa-2.2.2 chown -R root:root /etc/openvpn/easy-rsa/
rm -rf ~/easy-rsa.tar.gz rm -rf ~/EasyRSA-3.0.0.tgz
cd /etc/openvpn/easy-rsa/2.0/ cd /etc/openvpn/easy-rsa/
# Let's fix one thing first... # Create the PKI, set up the CA, the DH params and the server + client certificates
cp -u -p openssl-1.0.0.cnf openssl.cnf ./easyrsa init-pki
# Create the PKI ./easyrsa --batch build-ca nopass
. /etc/openvpn/easy-rsa/2.0/vars ./easyrsa gen-dh
. /etc/openvpn/easy-rsa/2.0/clean-all ./easyrsa build-server-full server nopass
# The following lines are from build-ca. I don't use that script directly ./easyrsa build-client-full $CLIENT nopass
# because it's interactive and we don't want that. Yes, this could break ./easyrsa gen-crl
# the installation script if build-ca changes in the future. # Move the stuff we need
export EASY_RSA="${EASY_RSA:-.}" cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn
"$EASY_RSA/pkitool" --initca $* # Generate server.conf
# Same as the last time, we are going to run build-key-server echo "port $PORT
export EASY_RSA="${EASY_RSA:-.}" proto udp
"$EASY_RSA/pkitool" --server server dev tun
# Now the client keys. We need to set KEY_CN or the stupid pkitool will cry ca ca.crt
export KEY_CN="$CLIENT" cert server.crt
export EASY_RSA="${EASY_RSA:-.}" key server.key
"$EASY_RSA/pkitool" $CLIENT dh dh.pem
# DH params topology subnet
. /etc/openvpn/easy-rsa/2.0/build-dh server 10.8.0.0 255.255.255.0
# Let's configure the server ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
cd /usr/share/doc/openvpn*/*ample*/sample-config-files echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
if [[ "$OS" = 'debian' ]]; then
gunzip -d server.conf.gz
fi
cp server.conf /etc/openvpn/
cd /etc/openvpn/easy-rsa/2.0/keys
cp ca.crt ca.key dh2048.pem server.crt server.key /etc/openvpn
cd /etc/openvpn/
# Set the server configuration
sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
sed -i "s|port 1194|port $PORT|" server.conf
# DNS # DNS
case $DNS in case $DNS in
1) 1)
# Obtain the resolvers from resolv.conf and use them for OpenVPN # Obtain the resolvers from resolv.conf and use them for OpenVPN
grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do grep -v '#' /etc/resolv.conf | grep 'nameserver' | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | while read line; do
sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
done done
;; ;;
2) 2)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
;; ;;
3) 3)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf echo 'push "dhcp-option DNS 4.2.2.2"' >> /etc/openvpn/server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf echo 'push "dhcp-option DNS 4.2.2.4"' >> /etc/openvpn/server.conf
;; ;;
4) 4)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf echo 'push "dhcp-option DNS 129.250.35.250"' >> /etc/openvpn/server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf echo 'push "dhcp-option DNS 129.250.35.251"' >> /etc/openvpn/server.conf
;; ;;
5) 5)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf echo 'push "dhcp-option DNS 74.82.42.42"' >> /etc/openvpn/server.conf
;; ;;
6) 6)
sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 8.8.8.8"|' server.conf echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 8.8.4.4"|' server.conf echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
;; ;;
esac esac
# Listen at port 53 too if user wants that echo "keepalive 10 120
if [[ "$ALTPORT" = 'y' ]]; then comp-lzo
iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT persist-key
sed -i "1 a\iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT" $RCLOCAL persist-tun
fi status openvpn-status.log
verb 3
crl-verify /etc/openvpn/easy-rsa/pki/crl.pem" >> /etc/openvpn/server.conf
# Enable net.ipv4.ip_forward for the system # Enable net.ipv4.ip_forward for the system
if [[ "$OS" = 'debian' ]]; then if [[ "$OS" = 'debian' ]]; then
sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
@ -294,13 +278,28 @@ else
fi fi
# Avoid an unneeded reboot # Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward echo 1 > /proc/sys/net/ipv4/ip_forward
# Set iptables # Set NAT for the VPN subnet
if [[ "$INTERNALNETWORK" = 'y' ]]; then iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL if pgrep firewalld; then
else # We don't use --add-service=openvpn because that would only work with
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP # the default port. Using both permanent and not permanent rules to
sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL # avoid a firewalld reload.
firewall-cmd --zone=public --add-port=$PORT/udp
firewall-cmd --zone=trusted --add-source=10.8.0.0/24
firewall-cmd --permanent --zone=public --add-port=$PORT/udp
firewall-cmd --permanent --zone=trusted --add-source=10.8.0.0/24
fi
if iptables -L | grep -q REJECT; then
# If iptables has at least one REJECT rule, we asume this is needed.
# Not the best approach but I can't think of other and this shouldn't
# cause problems.
iptables -I INPUT -p udp --dport $PORT -j ACCEPT
iptables -I FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
sed -i "1 a\iptables -I INPUT -p udp --dport $PORT -j ACCEPT" $RCLOCAL
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" $RCLOCAL
fi fi
# And finally, restart OpenVPN # And finally, restart OpenVPN
if [[ "$OS" = 'debian' ]]; then if [[ "$OS" = 'debian' ]]; then
@ -319,8 +318,7 @@ else
chkconfig openvpn on chkconfig openvpn on
fi fi
fi fi
# Try to detect a NATed connection and ask about it to potential LowEndSpirit # Try to detect a NATed connection and ask about it to potential LowEndSpirit users
# users
EXTERNALIP=$(wget -qO- ipv4.icanhazip.com) EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
if [[ "$IP" != "$EXTERNALIP" ]]; then if [[ "$IP" != "$EXTERNALIP" ]]; then
echo "" echo ""
@ -333,10 +331,19 @@ else
IP=$USEREXTERNALIP IP=$USEREXTERNALIP
fi fi
fi fi
# IP/port set on the default client.conf so we can add further users # client-common.txt is created so we have a template to add further users later
# without asking for them echo "client
sed -i "s|remote my-server-1 1194|remote $IP $PORT|" /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf dev tun
# Generate the client.ovpn proto udp
remote $IP $PORT
resolv-retry infinite
nobind
persist-key
persist-tun
remote-cert-tls server
comp-lzo
verb 3" > /etc/openvpn/client-common.txt
# Generates the custom client.ovpn
newclient "$CLIENT" newclient "$CLIENT"
echo "" echo ""
echo "Finished!" echo "Finished!"