The idea behind this script is to provide a DNS honeypot which logs all requests to a SQLite database and with a configurable interactivity level.
It can be configured to resolve only a number of DNS requests to seems like an open resolver to an attacker, after that it acts as a sinkhole.
For each request coming from a source IP only a custom number of requests are really resolved (sending back a DNS reply) before working as a sinkhole; after a configurable timeout, it can restart the loop.
The script is developed for Python 2.7 and the following libraries are required:
You can install them with (you need python-dev package to compile them):
pip install -r requirements.txt
You can print the option list using the help -h option:
$ python dns.py -h usage: dns.py [-h] [-p DNS_PORT] [-c REQ_COUNT] [-t REQ_TIMEOUT] [-s] [-v] server positional arguments: server DNS server IP address optional arguments: -h, --help show this help message and exit -p DNS_PORT, --dns-port DNS_PORT DNS honeypot port -c REQ_COUNT, --req-count REQ_COUNT how many request to resolve -t REQ_TIMEOUT, --req-timeout REQ_TIMEOUT how many request to resolve -s, --sql database connection string -v, --verbose print each request
You can run the DNS honeypot with the following command, you have to add the IP of the DNS server you use to resolve the first bunch of queries to seems like an open resolver (in this example we use 22.214.171.124):
$ python dns.py 126.96.36.199
Now your DNS honeypot is listening on both port 5053 UDP and TCP. If you want to bind it to port 53 you have to:
- run it as root and use option -p which is really not recommended
- add an iptables rule to redirect traffic from port 53 to port 5053
Example iptables rules to redirect traffic:
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 53 -j REDIRECT --to-ports 5053 iptables -t nat -A PREROUTING -i eth0 -p udp --dport 53 -j REDIRECT --to-ports 5053
Some other arguments are optional:
- -p is used to bind DNS honeypot service on a given port
- -c how many requests should be resolved (sending a DNS reply) like a real open resolver
- -t timeout to re-start resolving requests (sending a DNS reply) like a real open resolver
- -s choose a SQL database (default SQLite)
- -v verbose logging (prints each request)