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Re: [tor-talk] Tor TransparentProxy with iptables breaks connections ?



Hi elrippo thanks for the inputs.
Your implementation is good (in our opinion) because you block everything (INPUT DROP) and then allow only the strict necessary. We'll take your path, it will require some testing on a test server because you know what happens when you cut yourself out of the server with iptables .. :)
or block the entire service because of a mistyped rule :)

Wish you a nice sunday,
RuggedInbox team



On 2014-08-23 18:43, elrippo wrote:
Take a look at example f.) ->
https://elrippoisland.net/public/how_to/anonymity.html

Hello again :)

At https://ruggedinbox.com we are running a 'standard' email server,
using postfix, dovecot, and so on ..

The server is also able to receive and send emails to the onionland,
thanks to Tor providing DNS resolution for onion addresses and 'unbound'
for the clearnet.

As you may know, the full setup needs some iptables magic, as documented
in:
https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy
https://lists.torproject.org/pipermail/tor-talk/2014-March/032503.html
https://lists.torproject.org/pipermail/tor-talk/2014-March/032507.html

so we run the following rules:
1. iptables -t nat -A OUTPUT -p tcp -d 10.192.0.0/10 -j REDIRECT
--to-ports 9040
2. iptables -A OUTPUT -m conntrack --ctstate INVALID -j DROP
3. iptables -A OUTPUT ! -o lo ! -d 127.0.0.1 ! -s 127.0.0.1 -p tcp -m
tcp --tcp-flags ACK,FIN ACK,FIN -j DROP
4. iptables -A OUTPUT ! -o lo ! -d 127.0.0.1 ! -s 127.0.0.1 -p tcp -m
tcp --tcp-flags ACK,RST ACK,RST -j DROP

but it looks like the third rule breaks connections: the mail client
timeouts while checking POP mailboxes, randomly but very often.


Do you think that is safe to discard the third and forth rules ?
And if not, do you have other suggestions to be safe and prevent leaks ?


Thank you very much for supporting,
we look forward to publish all ruggedinbox's configuration as soon as
everything works ok
(and perhaps a 'ruggedinbox distro')
in order to have a starting base on which discuss and request for
comments,
which will help people to build their private email server, secure,
spam-resistant and Tor-aware :)

--
We don't bubble you, we don't spoof you ;)
Keep your data encrypted!
Log you soon,
your Admin
elrippo@xxxxxxxxxxxxxxxxx

Encrypted messages are welcome.
0x84DF1F7E6AE03644

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