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https://github.com/angristan/openvpn-install.git
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Merge pull request #3 from jtbr/master
changes to harden server and fix opennic DNS
This commit is contained in:
Angristan
commit
5f6159ce9f
@ -10,9 +10,12 @@ This fork includes :
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- Better encryption (see below)
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- TLS 1.2 only
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- AES-256-CBC and SHA-512 for HMAC (instead of BF-128-CBC and SHA1)
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- Run server in unprivileged mode, reducing risks to the system
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- TLS-auth to help [thwart DoS attacks](https://openvpn.net/index.php/open-source/documentation/howto.html#security) and provide a 2nd line of defense to the TLS channel.
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- [FDN's DNS Servers](http://www.fdn.fr/actions/dns/)
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- Nearest [OpenNIC DNS Servers](https://www.opennicproject.org/)
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- Up-to-date OpenVPN (2.3.11) thanks to [EPEL](http://fedoraproject.org/wiki/EPEL) and [swupdate.openvpn.net](https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos)
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- Support for either SNAT or MASQUERADE for forwarding
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- Every feature of the [original script](https://github.com/Nyr/openvpn-install) (I check periodically to sync the latest commits from source)
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## Variants
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@ -56,6 +56,10 @@ newclient () {
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echo "<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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echo "key-direction 1" >> ~/$1.ovpn
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echo "<tls-auth>" >> ~/$1.ovpn
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cat /etc/openvpn/tls-auth.key >> ~/$1.ovpn
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echo "</tls-auth>" >> ~/$1.ovpn
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}
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@ -141,7 +145,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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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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sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 /d' $RCLOCAL
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if hash sestatus 2>/dev/null; then
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if sestatus | grep "Current mode" | grep -qs "enforcing"; then
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if [[ "$PORT" != '1194' ]]; then
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@ -200,6 +204,14 @@ else
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echo " 5) Google"
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read -p "DNS [1-6]: " -e -i 2 DNS
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echo ""
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echo "Some setups (e.g. Amazon Web Services), require use of MASQUERADE rather than SNAT"
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echo "Which forwarding method do you want to use [if unsure, leave as default]?"
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echo " 1) SNAT (default)"
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echo " 2) MASQUERADE"
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while [[ $FORWARD_TYPE != "1" && $FORWARD_TYPE != "2" ]]; do
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read -p "Forwarding type: " -e -i 1 FORWARD_TYPE
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done
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echo ""
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echo "Finally, tell me your 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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@ -241,6 +253,12 @@ else
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yum install epel-release -y
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yum install openvpn iptables openssl wget ca-certificates curl -y
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fi
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# find out if the machine uses nogroup or nobody for the permissionless group
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if grep -qs "^nogroup:" /etc/group; then
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NOGROUP=nogroup
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else
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NOGROUP=nobody
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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/ ]]; then
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@ -273,8 +291,12 @@ set_var EASYRSA_DIGEST "sha384"" > vars
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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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# generate tls-auth key
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openvpn --genkey --secret /etc/openvpn/tls-auth.key
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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/easy-rsa/pki/crl.pem /etc/openvpn
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# Make cert revocation list readable for non-root
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chmod 644 /etc/openvpn/crl.pem
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# Generate server.conf
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echo "port $PORT
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proto udp
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@ -283,6 +305,8 @@ 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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user nobody
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group $NOGROUP
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topology subnet
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server 10.8.0.0 255.255.255.0
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ifconfig-pool-persist ipp.txt
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@ -291,7 +315,6 @@ auth SHA512
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tls-version-min 1.2" > /etc/openvpn/server.conf
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if [[ "$VARIANT" = '1' ]]; then
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# If the user selected the fast, less hardened version
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# Or if the user selected a non-existant variant, we fallback to fast
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echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256" >> /etc/openvpn/server.conf
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elif [[ "$VARIANT" = '2' ]]; then
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# If the user selected the relatively slow, ultra hardened version
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@ -313,10 +336,8 @@ tls-version-min 1.2" > /etc/openvpn/server.conf
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3) #OpenNIC
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#Getting the nearest OpenNIC servers using the geoip API
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read ns1 ns2 <<< $(curl -s https://api.opennicproject.org/geoip/ | head -2 | awk '{print $1}')
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echo -e "nameserver $ns1
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nameserver $ns2" >> /etc/resolv.conf #Set the DNS servers
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echo "push "dhcp-option DNS $ns1"" >> /etc/openvpn/server.conf
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echo "push "dhcp-option DNS $ns2"" >> /etc/openvpn/server.conf
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echo "push \"dhcp-option DNS $ns1\"" >> /etc/openvpn/server.conf
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echo "push \"dhcp-option DNS $ns2\"" >> /etc/openvpn/server.conf
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;;
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4) #OpenDNS
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echo 'push "dhcp-option DNS 208.67.222.222"' >> /etc/openvpn/server.conf
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@ -330,7 +351,9 @@ tls-version-min 1.2" > /etc/openvpn/server.conf
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echo "keepalive 10 120
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persist-key
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persist-tun
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crl-verify crl.pem" >> /etc/openvpn/server.conf
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crl-verify crl.pem
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tls-server
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tls-auth tls-auth.key 0" >> /etc/openvpn/server.conf
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# Enable net.ipv4.ip_forward for the system
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if [[ "$OS" = 'debian' ]]; then
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sed -i 's|#net.ipv4.ip_forward=1|net.ipv4.ip_forward=1|' /etc/sysctl.conf
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@ -345,8 +368,13 @@ crl-verify crl.pem" >> /etc/openvpn/server.conf
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# Avoid an unneeded reboot
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echo 1 > /proc/sys/net/ipv4/ip_forward
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# Set NAT for the VPN subnet
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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" $RCLOCAL
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if [[ "$FORWARD_TYPE" = '1' ]]; then
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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
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else
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iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
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sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE" $RCLOCAL
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fi
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if pgrep firewalld; then
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# We don't use --add-service=openvpn because that would only work with
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# the default port. Using both permanent and not permanent rules to
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@ -402,9 +430,10 @@ crl-verify crl.pem" >> /etc/openvpn/server.conf
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echo ""
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echo "Looks like your server is behind a NAT!"
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echo ""
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway), I need to know the external IP"
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP: " -e USEREXTERNALIP
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echo "If your server is NATed (e.g. LowEndSpirit, Scaleway, or behind a router),"
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echo "then I need to know the address that can be used to access it from outside."
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echo "If that's not the case, just ignore this and leave the next field blank"
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read -p "External IP or domain name: " -e USEREXTERNALIP
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if [[ "$USEREXTERNALIP" != "" ]]; then
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IP=$USEREXTERNALIP
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fi
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@ -421,10 +450,10 @@ persist-tun
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remote-cert-tls server
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cipher AES-256-CBC
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auth SHA512
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tls-version-min 1.2" > /etc/openvpn/client-common.txt
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tls-version-min 1.2
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tls-client" > /etc/openvpn/client-common.txt
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if [[ "$VARIANT" = '1' ]]; then
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# If the user selected the fast, less hardened version
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# Or if the user selected a non-existant variant, we fallback to fast
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echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-GCM-SHA256" >> /etc/openvpn/client-common.txt
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elif [[ "$VARIANT" = '2' ]]; then
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# If the user selected the relatively slow, ultra hardened version
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