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openvpn-install
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Allow forwarding using either SNAT or MASQUERADE (as required by some setups)

This commit is contained in:
jtbr 2016-04-12 10:05:28 +00:00
parent f376ce912f
commit 2fe0fa2062
2 changed files with 18 additions and 6 deletions
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1
README.md
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@ -16,6 +16,7 @@ This fork includes :
- [FDN's DNS Servers](http://www.fdn.fr/actions/dns/)
- Nearest [OpenNIC DNS Servers](https://www.opennicproject.org/)
- Up-to-date OpenVPN (2.3.10) thanks to [EPEL](http://fedoraproject.org/wiki/EPEL) and [swupdate.openvpn.net](https://community.openvpn.net/openvpn/wiki/OpenvpnSoftwareRepos)
- Support for either SNAT or MASQUERADE for forwarding
- Every feature of the [original script](https://github.com/Nyr/openvpn-install) (I check periodically to sync the latest commits from source)
## Variants

23
openvpn-install.sh
View File

@ -145,7 +145,7 @@ if [[ -e /etc/openvpn/server.conf ]]; then
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
sed -i '/iptables -t nat -A POSTROUTING -s 10.8.0.0\/24 /d' $RCLOCAL
if hash sestatus 2>/dev/null; then
if sestatus | grep "Current mode" | grep -qs "enforcing"; then
if [[ "$PORT" != '1194' ]]; then
@ -204,6 +204,14 @@ else
echo " 5) Google"
read -p "DNS [1-6]: " -e -i 2 DNS
echo ""
echo "Some setups (e.g. Amazon Web Services), require use of MASQUERADE rather than SNAT"
echo "Which forwarding method do you want to use [if unsure, leave as default]?"
echo " 1) SNAT (default)"
echo " 2) MASQUERADE"
while [[ $FORWARD_TYPE != "1" && $FORWARD_TYPE != "2" ]]; do
read -p "Forwarding type: " -e -i 1 FORWARD_TYPE
done
echo ""
echo "Finally, tell me your name for the client cert"
echo "Please, use one word only, no special characters"
read -p "Client name: " -e -i client CLIENT
@ -301,8 +309,7 @@ auth SHA512
tls-version-min 1.2" > /etc/openvpn/server.conf
if [[ "$VARIANT" = '1' ]]; then
# If the user selected the fast, less hardened version
# Or if the user selected a non-existant variant, we fallback to fast
# iOS OpenVPN connect doesn't support GCM or SHA256, use next best
# iOS OpenVPN connect doesn't support GCM or SHA256; use next best
echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-CBC-SHA" >> /etc/openvpn/server.conf
elif [[ "$VARIANT" = '2' ]]; then
# If the user selected the relatively slow, ultra hardened version
@ -356,8 +363,13 @@ tls-auth tls-auth.key 0" >> /etc/openvpn/server.conf
# Avoid an unneeded reboot
echo 1 > /proc/sys/net/ipv4/ip_forward
# 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" $RCLOCAL
if [[ "$FORWARD_TYPE" = '1' ]]; then
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
else
iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE
sed -i "1 a\iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE" $RCLOCAL
fi
if pgrep firewalld; then
# We don't use --add-service=openvpn because that would only work with
# the default port. Using both permanent and not permanent rules to
@ -436,7 +448,6 @@ tls-version-min 1.2
tls-client" > /etc/openvpn/client-common.txt
if [[ "$VARIANT" = '1' ]]; then
# If the user selected the fast, less hardened version
# Or if the user selected a non-existant variant, we fallback to fast
echo "tls-cipher TLS-DHE-RSA-WITH-AES-128-CBC-SHA" >> /etc/openvpn/client-common.txt
elif [[ "$VARIANT" = '2' ]]; then
# If the user selected the relatively slow, ultra hardened version