Latest revision as of 03:32, 10 July 2020

OpenVPN plus PIA

Preparing the Pi

Fixing iptables legacy

On the Kali linux pi image I used, I had to fix iptables to use a legacy NAT mode:

$ sudo update-alternatives --config iptables
There are 2 choices for the alternative iptables (providing /usr/sbin/iptables).

  Selection    Path                       Priority   Status
------------------------------------------------------------
  0            /usr/sbin/iptables-nft      20        auto mode
* 1            /usr/sbin/iptables-legacy   10        manual mode
  2            /usr/sbin/iptables-nft      20        manual mode

Initially, 0 was selected. Select the one called iptables-legacy.

OpenVPN

https://docs.pi-hole.net/guides/vpn/installation/

Installing OpenVPN

wget https://git.io/vpn -O openvpn-install.sh
chmod 755 openvpn-install.sh
sudo ./openvpn-install.sh

This will ask you which interface the openvpn server should bind to. Select the one that is public-facing (the internet).

I used the default port 1194, defaults for everything else.

Grab a coffee, this will install a bunch of stuff.

Checking OpenVPN Interface

OpenVPN will create a tun0 interface. Get its IP address:

ifconfig tun0 | grep 'inet'

Now take note of this IP address, as we will need to set a DNS option for our OpenVPN connection.

Use Pi VPN Gateway as DNS Server

The next step will tell anyone on the VPN network we just created to use the Pi as the DNS server.

Main article: Kali/OpenVPN/DNS

PIA

https://www.novaspirit.com/2017/06/22/raspberry-pi-vpn-router-w-pia/

Forwarding from OpenVPN to Access Point

Main article: Kali/OpenVPN/Hotspot

Flags

@@ Line 3: / Line 3: @@
 ==Preparing the Pi==
-===Fixing iptables===
+===Fixing iptables legacy===
 On the Kali linux pi image I used, I had to fix iptables to use a legacy NAT mode:
@@ Line 48: / Line 48: @@
 Now take note of this IP address, as we will need to set a DNS option for our OpenVPN connection.
-Edit <code>/etc/openvpn/server/server.conf</code>
+===Use Pi VPN Gateway as DNS Server===
-Add the tun0 interface by adding the line
+The next step will tell anyone on the VPN network we just created to use the Pi as the DNS server.
-<pre>
+{{Main|Kali/OpenVPN/DNS}}
-push "dhcp-option DNS <IP-ADDR-OF-TUN0-INTERFACE>"
-</pre>
-For me,
-<pre>
-push "dhcp-option DNS 10.8.0.1
-</pre>
-Also comment out any other <code>push "dhcp-option DNS</code> lines.
-Now restart the OpenVPN server:
-<pre>
-sudo systemctl restart openvpn
-</pre>
 ==PIA==
@@ Line 141: / Line 125: @@
 ==Forwarding from OpenVPN to Access Point==
-https://www.novaspirit.com/2017/06/22/raspberry-pi-vpn-router-w-pia/
+{{Main|Kali/OpenVPN/Hotspot}}
-The following assumes that you have the following configuration:
+=Flags=
-<pre>
+{{PiFlag}}
-                 wlan0 --> Internet
-                 tun0 (OpenVPN) --> Internet via wlan0
-WiFi Network --> wlan1 (Wifi AP) --> Internet via tun0
-</pre>
-Run these commands to wire up <code>wlan1</code> to <code>tun0</code>:
+{{OpenVPNFlag}}
-<pre>
+[[Category:Networking]]
-sudo iptables -A INPUT -i lo -m comment --comment "loopback" -j ACCEPT
+[[Category:Iptables]]
-sudo iptables -A OUTPUT -o lo -m comment --comment "loopback" -j ACCEPT
-sudo iptables -I INPUT -i wlan1 -m comment --comment "In from LAN" -j ACCEPT
-sudo iptables -I OUTPUT -o tun+ -m comment --comment "Out to VPN" -j ACCEPT
-sudo iptables -A OUTPUT -o wlan1 -p udp --dport 1198 -m comment --comment "openvpn" -j ACCEPT
-sudo iptables -A OUTPUT -o wlan1 -p udp --dport 123 -m comment --comment "ntp" -j ACCEPT
-sudo iptables -A OUTPUT -p UDP --dport 67:68 -m comment --comment "dhcp" -j ACCEPT
-sudo iptables -A OUTPUT -o wlan1 -p udp --dport 53 -m comment --comment "dns" -j ACCEPT
-sudo iptables -A FORWARD -i tun+ -o wlan1 -m state --state RELATED,ESTABLISHED -j ACCEPT
-sudo iptables -A FORWARD -i wlan1 -o tun+ -m comment --comment "LAN out to VPN" -j ACCEPT
-sudo iptables -t nat -A POSTROUTING -o tun+ -j MASQUERADE
-</pre>

RaspberryPi/OpenVPN: Difference between revisions

From charlesreid1