TuxGuardian is an application-based firewall with a graphical interface. It's main task is to control and forbid transmission & reception of data by unauthorized applications; it can be thought as the Linux equivalent to apps such as ZoneAlarm and Kerio
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In recent kernels the module does not compile since register_security it's not exported.
tuxguardian works great
A few years ago I was able to get this to work with some older kernels. For newer kernels something syntactically difficult, but conceptionally easy needed updating I think ... a capabilities array in one of the source files? I don't think I ever quite got it to work. As little attention as this has got, it sure is an important project! The lack of something like this is what's kept me from using Android devices.
very easy to use