NuFW


NuFW is a software package that extends Netfilter, the Linux kernel-internal packet filtering firewall module. 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.

Introduction

NuFW / UFWI is an extension of Netfilter which brings the notion of user to IP filtering.
NuFW / UFWI can :
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:
  1. A standard application sends a packet.
  2. The Nufw client sees that a connection is being initiated and sends a user request packet.
  3. The Nufw server queues the packet and sends an auth request packet to the Nuauth server.
  4. The Nuauth server sums the auth request and the user request packet and checks this against an authentication authority.
  5. The Nuauth server sends answer back to the Nufw server
  6. 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.

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