SnitchDNS

SnitchDNS is a database-driven DNS Server with a Web UI, written in Python and Twisted, that makes DNS administration easier with all configuration changed applied instantly without restarting any system services.

One of its main features is the logging of all DNS queries allowing the discovery of network traffic endpoints, and it can also be used to implement canary tokens as it supports notifications via e-mail, web push, Slack, and Teams. Red teamers can also use SnitchDNS to monitor phishing domains for sandboxes, integrate with SIEM solutions, restrict responses to specific IP ranges, egress data via a DNS tunnel and catch-all domains, and more.

Basic Features

• Database Driven.
  • Changes are reflected immediately on each DNS request.
  • Supported DBMS:
    • SQLite
    • MySQL / MariaDB
    • Postgres
• DNS Server
  • Support for common DNS Records.
    • A, AAAA, AFSDB, CNAME, DNAME, HINFO, MX, NAPTR, NS, PTR, RP, SOA, SPF, SRV, SSHFP, TSIG, TXT.
  • Catch-All Domains.
    • Ability to match any subdomain (no matter the depth) to a specific parent domain, for instance, *.hello.example.com.
  • Unmatched Record Forwarding.
    • Functionality to intercept specific queries (ie only A and CNAME) and forward all other records to a third-party DNS server (ie Google).
  • Tags and Aliases.
• IP Rules
  • Configure Allow/Block rules per domain.
• Notifications. Receive a notification when a domain is resolved, via:
  • E-mail
  • Web Push
  • Slack
  • Microsoft Teams
• User Management
  • Multi-User support
    • Each user is given their own subdomain to use.
  • LDAP Support
  • Two Factor Authentication
  • Password Complexity Management
• Logging
  • All DNS queries are logged, whether they have been matched or not.
  • CSV Logging for SIEM integration.
• Swagger 2.0 API
• Deployment
  • Ansible scripts for Ubuntu 18.04 / 20.04
  • Docker
  • CLI support for the zone, record, user, and settings management.
  • CSV Export/Import

Use Cases

SnitchDNS can be used for:

• A DNS Forwarding Server – Allowing you to monitor all requests via a Web GUI.
• Red Teams – Implement IP restrictions to block sandboxes, monitor phishing domain resolutions and e-mails, and restrict access to known IP ranges.
• DNS Tunnel – Log all DNS requests and egress data.
• Let’s Encrypt DNS challenge, using the API or the CLI interface.
• Ad-blocking.
• Canary Tokens.
• Integrate with SIEM solutions.

For more details on scenarios please see the Use Cases Document

Install & Use

Copyright (c) 2020 Pavel Tsakalidis, Context Information Security – part of Accenture Security