|Developer(s)||Laurent Defert et al.|
|Initial release||September 1, 2003|
|Stable release||2.2.20 / May 7, 2008|
|Operating system||Linux kernel|
|License||GNU General Public License|
NuFW is a GPL extension to Netfilter, the Linux kernel-internal packet filter. NuFW adds authentication to filtering rules. NuFW is also provided as a hardware firewall, in the EdenWall firewalling appliance. NuFW has been restarted by the FFI and renamed into UFWI.
NuFW / UFWI is an extension of Netfilter which brings the notion of user to IP filtering.
NuFW / UFWI can :
- Authenticate any connection that goes through your gateway or only from/to a chosen subset or a specific protocol (iptables is used to select the connections to authenticate).
- Perform accounting, routing and Quality of service (QOS) based on users and not simply on IPs.
- Filter packets with criteria such as application and OS used by distant users.
- Be the key of a secure and simple Single Sign On system.
NuFW / UFWI refuses the idea of IP == user as an IP address can easily be spoofed. It thus uses its own algorithm to perform authentication. It depends on two subsystems: Nufw which is connected to Netfilter and Nuauth which is connected to clients and Nufw.
The algorithm is the following:
- A standard application sends a packet.
- The Nufw client sees that a connection is being initiated and sends a user request packet.
- The Nufw server queues the packet and sends an auth request packet to the Nuauth server.
- The Nuauth server sums the auth request and the user request packet and checks this against an authentication authority.
- The Nuauth server sends answer back to the Nufw server
- The Nufw server transmits the packet following the answer given to its request.
This algorithm realizes an A Posteriori authentication of the connection. As there is no time-based association, this ensures the identity of the user who sent the packet. NuFW is the only real Authentication firewall, as it never associates a user with his machine.
- 2007 : Lutèce d'Or (Paris, France), Best Innovation
- 2005 : Les Trophées du Libre (Soissons, France), Security