hi all,

        Application gateways can do the authentication based on the 
        user rather than the ip-address alone. But, using a packet 
        filter (like ipfw) I think we cannot do the auth based on users - 
        like for example -  I cannot say - 

                allow user X from machine Y ftp access to outside.

        1.      I would like to know how hard it would it be to add user level 
                authentication to ipfw. 

        2.  One solution I feel is to redirect all the packets (of a, say, a TCP 
                application) to a local port on the firewall so that it can do the 
                required authentication and use one more connection to send the 
                packets out using another connection. 

                But, in that case we will be going to application level for each
                packet which is not essential. So, is it possible to 
                take the help of a user level process to just authenticate (say, at 
                the initiation of a connection/session) and once the authentication 
                succeeds forward at the ip-level only?
                Will there be any problems in such a scheme?

                Any inputs/ideas will be greatly appreciatated.

                                                                                TIA
                                                                                gopi


        
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