userdoc:openvpn_access [AstLinux Documentation]

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====== OpenVPN Access Policies ======

=== Configuring client-specific rules and access policies ===

Here is a good howto for this:

https://openvpn.net/index.php/open-source/documentation/howto.html#policy

Additionally in AstLinux the following must be done: 

  * In the Firewall config "Allow OpenVPN Server tunnel to xx LAN Interface" must **not** be checked!
  * The iptables rules should be put into ''/mnt/kd/arno-iptables-firewall/custom-rules'' file into the ''FORWARD_CHAIN''.
  * Because the limited users have still access to the Astlinux server itself, you could either
    * create a Firewall rule like ''Deny LAN->Local - Proto TCP/UDP - Source 10.8.2.0/24 - Port 0-65535'' for each of the limited virtual subnets
    * or create another iptables rule: ''iptables -A INT_INPUT_CHAIN -s 10.8.2.0/24 -j DROP'' for each subnet
  * The easy way is to push the internal LAN route in the OpenVPN server config (//push "route 192.168.3.0.255.255.255.0" in this case//).
  * The more secure way is NOT to push the route in the OpenVPN server config, but instead push only the relevant allowed destinations in the OpenVPN ccd/client file like ''push "route 192.168.3.200"'', but in this case the "Employees Class" from the example wouldn't work, cause there is no file to include the routing.

=== Examples ===

** OpenVPN Server Config **
\\ 
\\ 
{{userdoc:openvpn-policies.png?nolink|OpenVPN Policies}}
\\ 

!!Note:!! It is very important that Topology "Use Default" is used and NOT "Subnet"!

**/mnt/kd/arno-iptables-firewall/custom-rules**

<code># Put any custom (iptables) rules here down below:
##################################################

# Employee rule
iptables -A FORWARD_CHAIN -i tun0 -s 10.8.0.0/24 -d 192.168.3.100 -j ACCEPT
iptables -A INT_INPUT_CHAIN -s 10.8.0.0/24 -j DROP

# Sysadmin rule
iptables -A FORWARD_CHAIN -i tun0 -s 10.8.1.0/24 -d 192.168.3.0/24 -j ACCEPT

# Contractor1 rule
iptables -A FORWARD_CHAIN -i tun0 -s 10.8.2.0/24 -d 192.168.3.200 -j ACCEPT
iptables -A INT_INPUT_CHAIN -s 10.8.2.0/24 -j DROP
</code>

**/mnt/kd/openvpn/ccd/sysadmin**

  ifconfig-push 10.8.1.1 10.8.1.2
  ;push "route 192.168.3.0 255.255.255.0"

**/mnt/kd/openvpn/ccd/contractor1**
  
  ifconfig-push 10.8.2.1 10.8.2.2
  ;push route 192.168.3.200

The "push route ..." commands are optional (without the ";")(see above)