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



> Hi elrippo thanks for the inputs.
You are welcome :D

> Your implementation is good (in our opinion) because you block
> everything (INPUT DROP) and then allow only the strict necessary.
Yes, me and others believe this to be a way to close some "unnecessary" ports 
and/or attack vendors.
Do not forget to make a secure_mysql_install to close the tcp ports opened by 
a mysql default installation.

> 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 :)
I am honored, but that is just an exapmle added from several "howto's", wikis 
and my own limited experience.
Ooohh yes, i know exactly what you mean!!!

> 
> Wish you a nice sunday,
> RuggedInbox team
Same to you :)
Wish you a good hack ;),
elrippo

> 
> 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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-- 
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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