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Silent Dune FPA Client

Project Description

A Open Source Multi-Threaded and Modular Linux Firewall Manager Service.

Silent Dune is a complete replacement for firewall services like FirewallD and UFW.

Silent Dune is here to elevate and extend system security to new levels.


The Primary Goal of this project is to make creating and managing egress firewall rules as easy as possible for system administrators and to also log rule violations and send those back to administrators as alerts that something bad may be happening on their systems.

The Silent Dune Client is a new and powerful linux firewall management service that extends firewall management in exciting new ways. The SDC is modular and multi-threaded for great flexibility and performance.

Uses for SDC also include help with making systems HIPPA or PCI compliant when setting egress rules are required for compliance.

Configuration File



The installer disables any running firewall services, runs the installer and configuration code from each module. The final configuration is stored in /etc/silentdune/sdc.conf.
This is the firewall service, it must be run as root. It can be run in the foreground (SystemD style) or in the background (SysInit style). Init service scripts and configuration files are in the project init directory.

Silent Dune Modules

Firewall Manager Module

The FM module is the core of the SDC. This module communicates with the other modules to add, remove and query firewall rules. This module also saves running rules when shutdown and restores them on startup.

Logging Module

The LM is used to set firewall logging rules and to monitor the system log for triggered rule events. The LM provides a subscription service for other modules to subscribe to receive the system log events.

The purpose of the LM is to promote setting egress firewall rules. If all egress network traffic is constrained by rules, then any network activity that does not match the egress rules is potentially malicious and should be blocked. The LM module can then capture that activity and depending on which other modules are used can provide alerts to administrators.

Auto Discovery Module

The AD module looks at the local system configuration to create egress rules and sometimes ingress rules for external services required by the system. The AD module will also over time recheck all items, looking for changes and update the firewall rules accordingly.

This helps administrators by automating rule building for important external services.

Auto discover external services required for a system to be completely functional and set egress firewall rules to allow access to those services. Keep those rules up to date over time.

The AD module will also set ingress and egress rules for SSH. Any of the discovery items can be disabled by administrators. Administrators using the SDS module (Silent Dune Server module) may want to disable SSH in AD and create fine grain SSH rules in the Silent Dune Server.

The AD module also auto creates egress rejection rules for the OUTPUT and FORWARD chains.

Discovery items include:

  • DNS
  • NTP
  • System Updates (apt and yum, including mirrors)
  • DHCP

Silent Dune Server Module

The SDS module provides a connection with a Silent Dune Server to allow central management of a large number systems.

When used in conjunction with the Auto Discovery and Logging modules, creating and managing egress firewall rules can be greatly simplified for administrators. See: [Silent Dune GitHub project](

Modules In Development

Remote Configuration (IOT) Module

The RC module will allow a remote firewall rules to be downloaded and verified by the SDC and applied to the system. The RC module, when used in conjunction with the Auto Discovery module, allows many systems locked down with network egress rules to be remotely managed by a single configuration file.

The RC module is meant to be used for bolt-on security for IOT (Internet of Things) devices. Using the RC module allows a system to be very secure but still communicate with a cloud API. This also allows IOT systems to keep in sync as the cloud API infrastructure changes over time.

Future Modules

If you are interested in working on any of these modules, please contact me. <>

DBUS Module

Using DBUS inter-process communications to allow other process to create firewall rules, specifically egress rules.


One application of this I would like to see eventually is a email or web browser plugin that communicates with the SDC to allow egress traffic to high quality web sites. So if malicious code executes in an email attachment or the web browser and tries to communicate to an external Command and Control server, it would be blocked from doing so.

See BBC pure javascript ransomware article:

Docker Container Module

After talking with the Docker people at PyCon 2016, having a module that could centrally manage and monitor the firewall settings on Docker containers would be an exciting module for administrators to have.


This project is licensed under the GPLv3 license.

Release History

Release History

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Download Files

Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
SilentDune-Client-0.5.14.tar.gz (68.9 kB) Copy SHA256 Checksum SHA256 Source Jan 17, 2017

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