mirror of
https://github.com/angristan/openvpn-install.git
synced 2025-10-31 14:07:36 +01:00
The BIG commit
- 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
@@ -39,19 +39,16 @@ else
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fi
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newclient () {
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# Generates the client.ovpn
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cp /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf ~/$1.ovpn
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sed -i "/ca ca.crt/d" ~/$1.ovpn
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sed -i "/cert client.crt/d" ~/$1.ovpn
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sed -i "/key client.key/d" ~/$1.ovpn
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# Generates the custom client.ovpn
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cp /etc/openvpn/client-common.txt ~/$1.ovpn
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echo "<ca>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/ca.crt >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/ca.crt >> ~/$1.ovpn
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echo "</ca>" >> ~/$1.ovpn
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echo "<cert>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/$1.crt >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/issued/$1.crt >> ~/$1.ovpn
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echo "</cert>" >> ~/$1.ovpn
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echo "<key>" >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/2.0/keys/$1.key >> ~/$1.ovpn
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cat /etc/openvpn/easy-rsa/pki/private/$1.key >> ~/$1.ovpn
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echo "</key>" >> ~/$1.ovpn
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}
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@@ -83,13 +80,9 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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echo "Tell me a name for the client cert"
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echo "Please, use one word only, no special characters"
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read -p "Client name: " -e -i client CLIENT
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cd /etc/openvpn/easy-rsa/2.0/
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source ./vars
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# build-key for the client
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export KEY_CN="$CLIENT"
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" $CLIENT
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# Generate the client.ovpn
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cd /etc/openvpn/easy-rsa/
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./easyrsa build-client-full $CLIENT nopass
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# Generates the custom client.ovpn
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newclient "$CLIENT"
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echo ""
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echo "Client $CLIENT added, certs available at ~/$CLIENT.ovpn"
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@@ -98,7 +91,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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2)
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# This option could be documented a bit better and maybe even be simplimplified
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# ...but what can I say, I want some sleep too
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NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep -c "^V")
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NUMBEROFCLIENTS=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep -c "^V")
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if [[ "$NUMBEROFCLIENTS" = '0' ]]; then
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echo ""
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echo "You have no existing clients!"
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@@ -106,28 +99,24 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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fi
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echo ""
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echo "Select the existing client certificate you want to revoke"
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tail -n +2 /etc/openvpn/easy-rsa/2.0/keys/index.txt | grep "^V" | cut -d '/' -f 7 | cut -d '=' -f 2 | nl -s ') '
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tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | nl -s ') '
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if [[ "$NUMBEROFCLIENTS" = '1' ]]; then
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read -p "Select one client [1]: " CLIENTNUMBER
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else
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read -p "Select one client [1-$NUMBEROFCLIENTS]: " CLIENTNUMBER
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fi
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CLIENT=$(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)
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cd /etc/openvpn/easy-rsa/2.0/
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. /etc/openvpn/easy-rsa/2.0/vars
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. /etc/openvpn/easy-rsa/2.0/revoke-full $CLIENT
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# If it's the first time revoking a cert, we need to add the crl-verify line
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if ! grep -q "crl-verify" "/etc/openvpn/server.conf"; then
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echo "crl-verify /etc/openvpn/easy-rsa/2.0/keys/crl.pem" >> "/etc/openvpn/server.conf"
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# And restart
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if pgrep systemd-journal; then
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systemctl restart openvpn@server.service
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CLIENT=$(tail -n +2 /etc/openvpn/easy-rsa/pki/index.txt | grep "^V" | cut -d '=' -f 2 | sed -n "$CLIENTNUMBER"p)
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cd /etc/openvpn/easy-rsa/
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./easyrsa --batch revoke $CLIENT
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./easyrsa gen-crl
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# And restart
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if pgrep systemd-journal; then
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systemctl restart openvpn@server.service
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else
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if [[ "$OS" = 'debian' ]]; then
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/etc/init.d/openvpn restart
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else
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if [[ "$OS" = 'debian' ]]; then
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/etc/init.d/openvpn restart
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else
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service openvpn restart
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fi
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service openvpn restart
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fi
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fi
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echo ""
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@@ -138,6 +127,20 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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echo ""
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read -p "Do you really want to remove OpenVPN? [y/n]: " -e -i n REMOVE
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if [[ "$REMOVE" = 'y' ]]; then
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PORT=$(grep '^port ' /etc/openvpn/server.conf | cut -d " " -f 2)
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if pgrep firewalld; then
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# Using both permanent and not permanent rules to avoid a firewalld reload.
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firewall-cmd --zone=public --remove-port=$PORT/udp
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firewall-cmd --zone=trusted --remove-source=10.8.0.0/24
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firewall-cmd --permanent --zone=public --remove-port=$PORT/udp
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firewall-cmd --permanent --zone=trusted --remove-source=10.8.0.0/24
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fi
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if iptables -L | grep -q REJECT; then
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sed -i "/iptables -I INPUT -p udp --dport $PORT -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -s 10.8.0.0\/24 -j ACCEPT/d" $RCLOCAL
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sed -i "/iptables -I FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT/d" $RCLOCAL
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fi
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 -j SNAT --to /d' $RCLOCAL
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if [[ "$OS" = 'debian' ]]; then
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apt-get remove --purge -y openvpn openvpn-blacklist
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else
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@@ -145,8 +148,6 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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fi
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rm -rf /etc/openvpn
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rm -rf /usr/share/doc/openvpn*
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sed -i '/--dport 53 -j REDIRECT --to-port/d' $RCLOCAL
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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0/d' $RCLOCAL
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echo ""
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echo "OpenVPN removed!"
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else
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@@ -173,14 +174,6 @@ else
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echo "What port do you want for OpenVPN?"
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read -p "Port: " -e -i 1194 PORT
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echo ""
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echo "Do you want OpenVPN to be available at port 53 too?"
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echo "This can be useful to connect under restrictive networks"
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read -p "Listen at port 53 [y/n]: " -e -i n ALTPORT
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echo ""
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echo "Do you want to enable internal networking for the VPN?"
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echo "This can allow VPN clients to communicate between them"
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read -p "Allow internal networking [y/n]: " -e -i n INTERNALNETWORK
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echo ""
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echo "What DNS do you want to use with the VPN?"
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echo " 1) Current system resolvers"
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echo " 2) OpenDNS"
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@@ -205,82 +198,73 @@ else
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yum install openvpn iptables openssl wget -y
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fi
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# An old version of easy-rsa was available by default in some openvpn packages
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if [[ -d /etc/openvpn/easy-rsa/2.0/ ]]; then
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rm -f /etc/openvpn/easy-rsa/2.0/
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if [[ -d /etc/openvpn/easy-rsa/ ]]; then
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rm -rf /etc/openvpn/easy-rsa/
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fi
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# Get easy-rsa
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wget --no-check-certificate -O ~/easy-rsa.tar.gz https://github.com/OpenVPN/easy-rsa/archive/2.2.2.tar.gz
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tar xzf ~/easy-rsa.tar.gz -C ~/
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mkdir -p /etc/openvpn/easy-rsa/2.0/
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cp ~/easy-rsa-2.2.2/easy-rsa/2.0/* /etc/openvpn/easy-rsa/2.0/
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rm -rf ~/easy-rsa-2.2.2
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rm -rf ~/easy-rsa.tar.gz
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cd /etc/openvpn/easy-rsa/2.0/
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# Let's fix one thing first...
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cp -u -p openssl-1.0.0.cnf openssl.cnf
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# Create the PKI
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. /etc/openvpn/easy-rsa/2.0/vars
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. /etc/openvpn/easy-rsa/2.0/clean-all
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# The following lines are from build-ca. I don't use that script directly
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# because it's interactive and we don't want that. Yes, this could break
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# the installation script if build-ca changes in the future.
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" --initca $*
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# Same as the last time, we are going to run build-key-server
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" --server server
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# Now the client keys. We need to set KEY_CN or the stupid pkitool will cry
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export KEY_CN="$CLIENT"
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export EASY_RSA="${EASY_RSA:-.}"
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"$EASY_RSA/pkitool" $CLIENT
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# DH params
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. /etc/openvpn/easy-rsa/2.0/build-dh
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# Let's configure the server
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cd /usr/share/doc/openvpn*/*ample*/sample-config-files
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if [[ "$OS" = 'debian' ]]; then
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gunzip -d server.conf.gz
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fi
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cp server.conf /etc/openvpn/
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cd /etc/openvpn/easy-rsa/2.0/keys
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cp ca.crt ca.key dh2048.pem server.crt server.key /etc/openvpn
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cd /etc/openvpn/
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# Set the server configuration
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sed -i 's|dh dh1024.pem|dh dh2048.pem|' server.conf
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sed -i 's|;push "redirect-gateway def1 bypass-dhcp"|push "redirect-gateway def1 bypass-dhcp"|' server.conf
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sed -i "s|port 1194|port $PORT|" server.conf
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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
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tar xzf ~/EasyRSA-3.0.0.tgz -C ~/
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mv ~/EasyRSA-3.0.0/ /etc/openvpn/
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mv /etc/openvpn/EasyRSA-3.0.0/ /etc/openvpn/easy-rsa/
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chown -R root:root /etc/openvpn/easy-rsa/
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rm -rf ~/EasyRSA-3.0.0.tgz
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cd /etc/openvpn/easy-rsa/
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# Create the PKI, set up the CA, the DH params and the server + client certificates
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./easyrsa init-pki
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./easyrsa --batch build-ca nopass
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./easyrsa gen-dh
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./easyrsa build-server-full server nopass
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./easyrsa build-client-full $CLIENT nopass
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./easyrsa gen-crl
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# Move the stuff we need
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cp pki/ca.crt pki/private/ca.key pki/dh.pem pki/issued/server.crt pki/private/server.key /etc/openvpn
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# Generate server.conf
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echo "port $PORT
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proto udp
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dev tun
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ca ca.crt
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cert server.crt
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key server.key
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dh dh.pem
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topology subnet
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server 10.8.0.0 255.255.255.0
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ifconfig-pool-persist ipp.txt" > /etc/openvpn/server.conf
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echo 'push "redirect-gateway def1 bypass-dhcp"' >> /etc/openvpn/server.conf
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# DNS
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case $DNS in
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1)
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# Obtain the resolvers from resolv.conf and use them for OpenVPN
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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
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sed -i "/;push \"dhcp-option DNS 208.67.220.220\"/a\push \"dhcp-option DNS $line\"" server.conf
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echo "push \"dhcp-option DNS $line\"" >> /etc/openvpn/server.conf
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done
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;;
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2)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 208.67.222.222"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 208.67.220.220"|' server.conf
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echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
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echo 'push "dhcp-option DNS 208.67.220.220"' >> /etc/openvpn/server.conf
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;;
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3)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 4.2.2.2"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 4.2.2.4"|' server.conf
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echo 'push "dhcp-option DNS 4.2.2.2"' >> /etc/openvpn/server.conf
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echo 'push "dhcp-option DNS 4.2.2.4"' >> /etc/openvpn/server.conf
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;;
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4)
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 129.250.35.250"|' server.conf
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 129.250.35.251"|' server.conf
|
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echo 'push "dhcp-option DNS 129.250.35.250"' >> /etc/openvpn/server.conf
|
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echo 'push "dhcp-option DNS 129.250.35.251"' >> /etc/openvpn/server.conf
|
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;;
|
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5)
|
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 74.82.42.42"|' server.conf
|
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echo 'push "dhcp-option DNS 74.82.42.42"' >> /etc/openvpn/server.conf
|
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;;
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6)
|
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sed -i 's|;push "dhcp-option DNS 208.67.222.222"|push "dhcp-option DNS 8.8.8.8"|' server.conf
|
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sed -i 's|;push "dhcp-option DNS 208.67.220.220"|push "dhcp-option DNS 8.8.4.4"|' server.conf
|
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echo 'push "dhcp-option DNS 8.8.8.8"' >> /etc/openvpn/server.conf
|
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echo 'push "dhcp-option DNS 8.8.4.4"' >> /etc/openvpn/server.conf
|
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;;
|
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esac
|
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# Listen at port 53 too if user wants that
|
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if [[ "$ALTPORT" = 'y' ]]; then
|
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iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT
|
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sed -i "1 a\iptables -t nat -A PREROUTING -p udp -d $IP --dport 53 -j REDIRECT --to-port $PORT" $RCLOCAL
|
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fi
|
||||
echo "keepalive 10 120
|
||||
comp-lzo
|
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persist-key
|
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persist-tun
|
||||
status openvpn-status.log
|
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verb 3
|
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crl-verify /etc/openvpn/easy-rsa/pki/crl.pem" >> /etc/openvpn/server.conf
|
||||
# Enable net.ipv4.ip_forward for the system
|
||||
if [[ "$OS" = 'debian' ]]; then
|
||||
sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
|
||||
@@ -294,13 +278,28 @@ else
|
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fi
|
||||
# Avoid an unneeded reboot
|
||||
echo 1 > /proc/sys/net/ipv4/ip_forward
|
||||
# Set iptables
|
||||
if [[ "$INTERNALNETWORK" = 'y' ]]; then
|
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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 ! -d 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
|
||||
else
|
||||
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP
|
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sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -j SNAT --to $IP" $RCLOCAL
|
||||
# Set NAT for the VPN subnet
|
||||
iptables -t nat -A POSTROUTING -s 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" $RCLOCAL
|
||||
if pgrep firewalld; then
|
||||
# We don't use --add-service=openvpn because that would only work with
|
||||
# the default port. Using both permanent and not permanent rules to
|
||||
# avoid a firewalld reload.
|
||||
firewall-cmd --zone=public --add-port=$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" $RCLOCAL
|
||||
fi
|
||||
# And finally, restart OpenVPN
|
||||
if [[ "$OS" = 'debian' ]]; then
|
||||
@@ -319,8 +318,7 @@ else
|
||||
chkconfig openvpn on
|
||||
fi
|
||||
fi
|
||||
# Try to detect a NATed connection and ask about it to potential LowEndSpirit
|
||||
# users
|
||||
# Try to detect a NATed connection and ask about it to potential LowEndSpirit users
|
||||
EXTERNALIP=$(wget -qO- ipv4.icanhazip.com)
|
||||
if [[ "$IP" != "$EXTERNALIP" ]]; then
|
||||
echo ""
|
||||
@@ -333,10 +331,19 @@ else
|
||||
IP=$USEREXTERNALIP
|
||||
fi
|
||||
fi
|
||||
# IP/port set on the default client.conf so we can add further users
|
||||
# without asking for them
|
||||
sed -i "s|remote my-server-1 1194|remote $IP $PORT|" /usr/share/doc/openvpn*/*ample*/sample-config-files/client.conf
|
||||
# Generate the client.ovpn
|
||||
# client-common.txt is created so we have a template to add further users later
|
||||
echo "client
|
||||
dev tun
|
||||
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"
|
||||
echo ""
|
||||
echo "Finished!"
|
||||
|
||||
Reference in New Issue
Block a user