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Re: [tor-talk] iptables rules

To: tor-talk@xxxxxxxxxxxxxxxxxxxx
Subject: Re: [tor-talk] iptables rules
From: CJ <tor@xxxxxxxx>
Date: Wed, 22 Oct 2014 06:40:34 +0200
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woops, didn't see the last row mentioning debian-tor user, my bad :(

good to know about ntp, I'll add it to my own stuff later.

Sorry for the noise, being sick doesn't help much reading iptables rules :/

On 10/21/2014 07:57 PM, elrippo wrote:
> Hmmm, at point 5.f.) that's exactly what i propose. Please do not forget
> to let your relay do the NTP without TOR, becuase of the latency.
> 
> Read down below....
> 
>  
> 
> ---------------------------------------------------------------------------------------------------
> 
>  
> 
> f.) Now let's configure our second scenario, where the middlebox is
> handing over to Tor, acting as an ExitRelay and the traffic of the
> router is also handed to Tor.
> 
> /etc/tor/torrc
> 
> VirtualAddrNetworkIPv4 172.16.0.0/12
> 
> TransPort 9040
> 
> TransPort 192.168.100.1:9040
> 
> TransPort 192.168.200.1:9040
> 
> AutomapHostsOnResolve 1
> 
> DNSPort 9053
> 
> DNSPort 192.168.100.1:9053
> 
> DNSPort 192.168.200.1:9053
> 
> SocksPort 127.0.0.1:9050
> 
> ControlPort 9051
> 
> HashedControlPassword 16:somewilddigitsofsomekindofnumbers
> 
> ORPort 9001
> 
> Nickname PickYourNicknameLikeCounterNSAServer
> 
> ContactInfo Random Person somename@xxxxxxxxxxxxxx
> 
> DirPort 9030
> 
> DirPortFrontPage /path/to/your/tor-exit-notice.html
> 
> ExitPolicy accept *:22,accept *:80,accept *:443,reject *:*
> 
> /etc/firewall/tor-only.bash
> 
> #!/bin/bash
> 
> modprobe ip_tables
> 
> modprobe ip_nat_ftp
> 
> modprobe ip_nat_irc
> 
> modprobe ip_conntrack
> 
> modprobe ip_conntrack_irc
> 
> modprobe ip_conntrack_ftp
> 
> modprobe ip_nat_ftp
> 
> modprobe ipt_limit
> 
> modprobe ipt_multiport
> 
> modprobe iptable_mangle
> 
> modprobe ipt_state
> 
> modprobe iptable_filter
> 
> modprobe iptable_nat
> 
> modprobe ipt_REJECT
> 
> modprobe ipt_LOG
> 
> modprobe xt_recent
> 
> modprobe ipt_mac
> 
> ####################################################################
> 
> # Remove all rules
> 
> iptables -F
> 
> iptables -X
> 
> iptables -t nat -F
> 
> ####################################################################
> 
> # First set the default behaviour
> 
> iptables -P INPUT DROP
> 
> iptables -P OUTPUT DROP
> 
> iptables -P FORWARD DROP
> 
> ####################################################################
> 
> ################################################################################
> 
> # INPUT INCOMMING rules for ALL INTERFACES #
> 
> ################################################################################
> 
> # ALLOW ESTABLISHED and RELATED incoming connections
> 
> iptables -A INPUT -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> iptables -A INPUT -i eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> iptables -A INPUT -i wlan0 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> ################################################################################
> 
> # OUTPUT OUTGOING rules for ALL INTERFACES #
> 
> ################################################################################
> 
> iptables -A OUTPUT -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> iptables -A OUTPUT -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> iptables -A OUTPUT -o wlan0 -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> ################################################################################
> 
> # ALLOW self communication
> 
> iptables -A INPUT -i lo -j ACCEPT
> 
> iptables -A OUTPUT -o lo -j ACCEPT
> 
> ################################################################################
> 
> # ALLOW incomming connections on our internal interfaces
> 
> iptables -A INPUT -i eth1 -j ACCEPT
> 
> iptables -A INPUT -i wlan0 -j ACCEPT
> 
> iptables -t nat -A PREROUTING -i eth1 -p udp -m udp --dport 123 -j
> REDIRECT --to-ports 123
> 
> iptables -t nat -A PREROUTING -i eth1 -p udp --dport 53 -j REDIRECT
> --to-ports 9053
> 
> iptables -t nat -A PREROUTING -i eth1 -p tcp --syn -j REDIRECT
> --to-ports 9040
> 
> iptables -t nat -A PREROUTING -i wlan0 -p udp -m udp --dport 123 -j
> REDIRECT --to-ports 123
> 
> iptables -t nat -A PREROUTING -i wlan0 -p udp --dport 53 -j REDIRECT
> --to-ports 9053
> 
> iptables -t nat -A PREROUTING -i wlan0 -p tcp --syn -j REDIRECT
> --to-ports 9040
> 
> iptables -t nat -A OUTPUT -o lo -j RETURN
> 
> iptables -t nat -A OUTPUT -m owner --uid-owner "debian-tor" -j RETURN
> 
> iptables -t nat -A OUTPUT -p udp --dport 53 -j REDIRECT --to-ports 9053
> 
> iptables -t nat -A OUTPUT -p tcp --syn -j REDIRECT --to-ports 9040
> 
> iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
> iptables -A OUTPUT -m owner --uid-owner "debian-tor" -j ACCEPT
> 
> for NET in 127.0.0.0/8; do
> 
> iptables -A OUTPUT -d $NET -j ACCEPT
> 
> done
> 
> iptables -A OUTPUT -p udp -m udp --dport 123 -j ACCEPT
> 
> iptables -A OUTPUT -j REJECT
> 
> Make this script executable and load it on system start. This script
> assumes that the Tor instance is also started at system start
> 
> I hope you had some fun anonyminizing your traffic :D
> 
> Read you later ;)
> 
> 
> ---------------------------------------------------------------------------------------------------
> 
>  
> 
> On Dienstag, 21. Oktober 2014, 07:41:15 CJ wrote:
> 
>>
> 
>> On 10/20/2014 06:09 PM, Elrippo wrote:
> 
>> > Try https://elrippoisland.net/public/how_to/anonymity.html
> 
>>
> 
>> hmm, there are some issues with the proposed iptables rulesâ
> 
>> I'd rather read Mike's blog post[1] and take his scripts in order to
> 
>> lock OUTPUT chain for good, allowing only debian-tor user traffic to go
> 
>> out. Sadly you won't be able to filter out traffic as on Android, as
> 
>> most of the application will run with your own user. But Tor does have
> 
>> his dedicated user, so some magic is still possible in order to prevent
> 
>> any leak.
> 
>>
> 
>> Something like that *should* be OK:
> 
>>
> 
>> # lock down network
> 
>> $ipt -P OUTPUT DROP
> 
>> $ipt -P INPUT DROP
> 
>> $ipt -P FORWARD DROP
> 
>>
> 
>> # allow local connections
> 
>> $ipt -I OUTPUT -o lo -j ACCEPT
> 
>> $ipt -I INPUT -i lo -j ACCEPT
> 
>> # allow debian-tor outputs
> 
>> $ipt -I OUTPUT -m owner --uid-owner debian-tor -j ACCEPT
> 
>> # allow related/established incoming
> 
>> $ipt -I INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
> 
>>
> 
>> # redirect DNS traffic
> 
>> $ipt -t nat -I PREROUTING ! -i lo -p udp --dport 53 -j REDIRECT
> 
>> --to-ports $DNSPROXY
> 
>> # redirect tcp to transproxy
> 
>> $ipt -t nat -I PREROUTING ! -i lo -p tcp --syn -j REDIRECT --to-ports
> 
>> $TRANSPROXY
> 
>>
> 
>> more or less. I don't have the whole stuff in head, and my script is at
> 
>> home.
> 
>>
> 
>> Use with care, as it might as well lock you out ;).
> 
>> You should add the DNSProxy and TransProxy settings as well in your torrc.
> 
>>
> 
>> Cheers,
> 
>>
> 
>> C.
> 
>>
> 
>> [1]
> 
>>
> https://blog.torproject.org/blog/mission-impossible-hardening-android-security-and-privacy
> 
>>
> 
>> >
> 
>> > Am 20. Oktober 2014 17:52:18 MESZ, schrieb Robert Watson
> <robert@xxxxxxxxxxxxxxx>:
> 
>> >> could someone please clarify a question I have about configuring tor &
> 
>> >> iptables. I'm using a dual nic centos server with squid/privoxy/tor
> 
>> >> behind
> 
>> >> a ISP router. My internet nic (eth0) gets a dhcp address so I wasn't
> 
>> >> sure
> 
>> >> how to set SocksBindAddress to the eth0 address? Is there a
> 
>> >> SocksBindAdapter setting available?
> 
>> >> My tor.conf:
> 
>> >> *SocksPort 9150 #privoxy socks5 port*
> 
>> >
> 
>> >> *SocksBindAddress 127.0.0.1*
> 
>> >> *SocksPolicy accept 127.0.0.1*
> 
>> >> *SocksPolicy reject **
> 
>> >> *AllowUnverifiedNodes middle,rendezvous*
> 
>> >> *Log notice syslog*
> 
>> >> *RunAsDaemon 1*
> 
>> >> *User tor*
> 
>> >> *CircuitBuildTimeout 30*
> 
>> >> *NumEntryGuards 6*
> 
>> >> *KeepalivePeriod 60*
> 
>> >> *NewCircuitPeriod 15*
> 
>> >> *DataDirectory /var/lib/tor*
> 
>> >> *PidFile /var/run/tor/tor.pid*
> 
>> >> *Log notice file /var/log/tor/tor.log*
> 
>> >
> 
>> >> I was thinking I would have to forward eth0:9050 to lo:9050 with these
> 
>> >> rules:
> 
>> >> *-A FORWARD -i lo -o eth0 -p tcp --dport 9050 -j ACCEPT*
> 
>> >> *-A FORWARD -i eth0 -o lo -m state --state ESTABLISHED,RELATED -j
> 
>> >> ACCEPT*
> 
>> >
> 
>> >> Any advice would be appreciated.
> 
>> >> Robert
> 
>> >> --
> 
>> >> tor-talk mailing list - tor-talk@xxxxxxxxxxxxxxxxxxxx
> 
>> >> To unsubscribe or change other settings go to
> 
>> >> https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-talk
> 
>> >
> 
>> >
> 
>>
> 
>>
> 
>  
> 
> -- 
> 
> 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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>  
> 
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Follow-Ups:
- Re: [tor-talk] iptables rules
  - From: Elrippo

References:
- [tor-talk] iptables rules
  - From: Robert Watson
- Re: [tor-talk] iptables rules
  - From: Elrippo
- Re: [tor-talk] iptables rules
  - From: CJ

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