Adding an application firewall rule to both private and public networks via win7 FirewallAPI

Question

A little background: Basicaly I\'d like to add a program firewall access rule to both private and public networks.

I used to use this- \"netsh firewall add allowedpr

Answer 1

I think your best bet is to talk to the Windows Firewall with Advanced Security API.

A quick google for "C# INetFwRule2" will show you numerous examples of how to register or update a Firewall rule.

In order to add to both public and private policies i've used something along the lines of

Type tNetFwPolicy2 = Type.GetTypeFromProgID("HNetCfg.FwPolicy2");
INetFwPolicy2 fwPolicy2 = (INetFwPolicy2)Activator.CreateInstance(tNetFwPolicy2);
var currentProfiles = fwPolicy2.CurrentProfileTypes;

// Let's create a new rule

INetFwRule2 inboundRule = (INetFwRule2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FWRule"));
inboundRule.Enabled = true;
inboundRule.LocalPorts = "1234";
inboundRule.Protocol = 6; // TCP
// ...
inboundRule.Profiles = currentProfiles;

// Now add the rule

INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
firewallPolicy.Rules.Add(inboundRule);