Firejail

Firejail is a SUID sandbox program that reduces the risk of security breaches by restricting the running environment of untrusted applications using Linux namespaces, seccomp-bpf and Linux capabilities. It allows a process and all its descendants to have their own private view of the globally shared kernel resources, such as the network stack, process table, mount table. Firejail can work in a SELinux or AppArmor environment, and it is integrated with Linux Control Groups.

Written in C with virtually no dependencies, the software runs on any Linux computer with a 3.x kernel version or newer. It can sandbox any type of processes: servers, graphical applications, and even user login sessions. The software includes sandbox profiles for a number of more common Linux programs, such as Mozilla Firefox, Chromium, VLC, Transmission etc.

The sandbox is lightweight, the overhead is low. There are no complicated configuration files to edit, no socket connections open, no daemons running in the background. All security features are implemented directly in Linux kernel and available on any Linux computer.

Project webpage: https://firejail.wordpress.com/

Download and Installation: https://firejail.wordpress.com/download-2/

Features: https://firejail.wordpress.com/features-3/

Documentation: https://firejail.wordpress.com/documentation-2/

FAQ: https://firejail.wordpress.com/support/

Travis-CI status: https://travis-ci.org/netblue30/firejail

Compile and install

$ git clone https://github.com/netblue30/firejail.git
$ cd firejail
$ ./configure && make && sudo make install-strip

On Debian/Ubuntu you will need to install git and a compiler:

$ sudo apt-get install git build-essential

Running the sandbox

To start the sandbox, prefix your command with “firejail”:

$ firejail firefox            # starting Mozilla Firefox
$ firejail transmission-gtk   # starting Transmission BitTorrent
$ firejail vlc                # starting VideoLAN Client
$ sudo firejail /etc/init.d/nginx start

Run "firejail --list" in a terminal to list all active sandboxes. Example:

$ firejail --list
1617:netblue:/usr/bin/firejail /usr/bin/firefox-esr
7719:netblue:/usr/bin/firejail /usr/bin/transmission-qt
7779:netblue:/usr/bin/firejail /usr/bin/galculator
7874:netblue:/usr/bin/firejail /usr/bin/vlc --started-from-file file:///home/netblue/firejail-whitelist.mp4
7916:netblue:firejail --list

Desktop integration

Integrate your sandbox into your desktop by running the following two commands:

$ firecfg --fix-sound
$ sudo firecfg

The first command solves some shared memory/PID namespace bugs in PulseAudio software prior to version 9. The second command integrates Firejail into your desktop. You would need to logout and login back to apply PulseAudio changes.

Start your programs the way you are used to: desktop manager menus, file manager, desktop launchers. The integration applies to any program supported by default by Firejail. There are about 250 default applications in current Firejail version, and the number goes up with every new release. We keep the application list in /usr/lib/firejail/firecfg.config file.

Security profiles

Most Firejail command line options can be passed to the sandbox using profile files. You can find the profiles for all supported applications in /etc/firejail directory.

If you keep additional Firejail security profiles in a public repository, please give us a link:

https://github.com/chiraag-nataraj/firejail-profiles
https://github.com/triceratops1/fe

Use this issue to request new profiles: #1139

We also keep a list of profile fixes for previous released versions in etc-fixes directory .

Current development version: 0.9.57

New Long Term Support (0.9.56-LTS) version released

The new version updates the code base to 0.9.56. We target a reduction of approx. 40% of the code by removing rarely used features (chroot, overlay, rlimits, cgroups), incomplete features (private-bin, private-lib), and a lot of instrumentation (build profile feature, tracing, auditing, etc). Sandbox-specific security features such as seccomp, capabilities, filesystem whitelist/blacklist and networking are updated and hardened.

firejail (0.9.56-LTS) baseline; urgency=low
  * code based on Firejail version 0.9.56
  * much smaller code base for SUID executable
  * command line options removed:
     --audit, --build, --cgroup, --chroot, --get, --ls, --output,
     --output-stderr, --overlay, --overlay-named, --overlay-tmpfs,
     --overlay-clean, --private-home, --private-bin, --private-etc,
     --private-opt, --private-srv, --put, --rlimit*, --trace, --tracelog,
     --x11*, --xephyr*
  * compile-time options: --enable-apparmor, --disable-seccomp,
     --disable-globalcfg, --disable-network, --disable-userns,
     --disable-whitelist, --disable-suid, --enable-fatal-warnings,
     --enable-busybox-workaround
 -- netblue30 <netblue30@yahoo.com>  Sun, 21 Oct 2018 08:00:00 -0500

The new LTS branch is here: https://github.com/netblue30/firejail/tree/LTSbase

New commands:

      --net.print=name|pid
              If a new network namespace is enabled, print network interface
              configuration  for the sandbox specified by name or PID. Exam‐
              ple:

              $ firejail --net.print=browser
              Switching to pid 1853, the  first  child  process  inside  the
              sandbox
              Interface  MAC               IP            Mask        Status
              lo                           127.0.0.1     255.0.0.0     UP
              eth0-1852  5e:fb:8e:27:29:26 192.168.1.186 255.255.255.0 UP

New profiles:

QMediathekView, aria2c, Authenticator, checkbashisms, devilspie, devilspie2, easystroke, github-desktop, min, bsdcat, bsdcpio, bsdtar, lzmadec, lbunzip2, lbzcat, lbzip2, lzcat, lzcmp, lzdiff, lzegrep, lzfgrep, lzgrep, lzless, lzma, lzmainfo, lzmore, unlzma, unxz, xzcat, xzcmp, xzdiff, xzegrep, xzfgrep, xzgrep, xzless, xzmore, lzip, artha, nitroshare, nitroshare-cli, nitroshare-nmh, nirtoshare-send, nitroshare-ui, mencoder, gnome-pie, masterpdfeditor, QOwnNotes, aisleriot, Mendeley, feedreader, ocenaudio, mpsyt, thunderbird-wayland, supertuxcart