Using pf to force different outgoing IP address depending on UNIX
user/group for locally originating connection?
eduard.vopicka at i.cz
Tue Jan 31 11:54:17 PST 2006
My goal is to use pf to force (via NAT) different IP outgoing addresses
depending on UID and/or GID of the program establishing the connection, for
connections originating locally on machine with FreeBSD 5.4. (I do not expect
this to work for setuid/setgid programs.)
I realize that I can filter and tag outgoing packet based on UID/GID on the
outgoing interface, but after filtering and tagging, it is too late for NAT.
I believe in that it is possible to achieve my goal with pf, but probably some
sort of loopback routing is required, so that the packet can first be tagged
in the filtering rule dependind on the UID/GID, then somewhat routed back and
then NATed based on the tag?
E.g., the primary address on the outgoing ethernet interface is for example
192.168.33.11 and then for programs being run by user with UID=1004 I need to
force outgoing IP address 192.168.33.14, for UID=1005 outgoing IP address
220.127.116.11 and so on. Hope this concpt can be easily extended also for use
Thanks in advance for pointing me in the right direction and please excuse my
ICZ a.s. - Oddeleni vnitrniho IT
Hvezdova 1689, 140 00 Praha 4, CZ
Tel: +420 244 100 248, +420 244 100 111
Fax: +420 244 100 222
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