Messages in this thread |  | | Date | Wed, 6 Nov 1996 23:58:35 +0100 (MET) | From | Magnus Ahltorp <> | Subject | Re: UID permissions mappings for "privileged ports" feature -- anybody done? |
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> Anyway, somebody have a patch that already does something like that? > I'm sure I could hack in a less elegant static solution (like > "if(portnum=80&&uid==12345) goto ok;" or whatever the code would say). > Wait ... hmm ... I can't find it in the kernel source. Is this a libc > thing?
You can do this without kernel hacking, by letting a priviliged program allocate the port. If you really want to hack kernel, look for suser() calls in net/ipv4/af_inet.c. You'll see a line where it checks if the port number is below a value, and at the same time checks that the user is the superuser. Of course you can hack it to allow users in a special group to access a port to make it more flexible. Be sure you know what you're doing first.
/Magnus
magnus@abc.se
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