[Privoxy-users] Privoxy on router firmwares poses a huge security risk

[richard lucassen]

On Tue, 31 Dec 2019 16:45:47 -0500
Lee <ler762 at gmail.com> wrote:

> What the OP needs to do is figure out how to do pbr on traffic coming
> from privoxy so that traffic not for the internal network goes out via
> the vpn.  But I don't know if it's possible to have a pbr rule that
> applies only to packets coming from one specific service on the router
> :(

I don't know if this resolves OP's problem, but using "iptables" you can
force privoxy to use a different outgoing ip, assuming that privoxy runs
as user "privoxy". E.g. a router has ip 192.168.1.1 on outgoing
interface eth0, just add an extra ip:

ip address add 192.168.1.2/32 dev eth0

then:

iptables -t nat -A POSTROUTING -o eth0 -m owner --uid-owner privoxy \
  -j SNAT --to-source 192.168.1.2

after that, force traffic from 192.168.1.2 to use e.g. table 10:

ip rule add from 192.168.1.2 lookup 10

Disclaimer: not tested, just my 2 cts.

R.

-- 
richard lucassen
http://contact.xaq.nl/