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# 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. 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
`````
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/frequently-asked-questions/
`````
`````
# Current development version: 0.9.41
## Deprecated --user
--user option was deprecated, please use "sudo -u username firejail application" instead.
## --whitelist rework
Symlinks outside user home directories are allowed:
`````
--whitelist=dirname_or_filename
Whitelist directory or file. This feature is implemented only
for user home, /dev, /media, /opt, /var, and /tmp directories.
With the exeception of user home, both the link and the real
file should be in the same top directory.
Example:
$ firejail --noprofile --whitelist=~/.mozilla
$ firejail --whitelist=/tmp/.X11-unix --whitelist=/dev/null
$ firejail "--whitelist=/home/username/My Virtual Machines"
`````
## AppImage
AppImage (http://appimage.org/) is a distribution-agnostic packaging format.
The package is a regular ISO file containing all binaries, libraries and resources
necessary for the program to run.
We introduce in this release support for sandboxing AppImage applications. Example:
`````
$ firejail --appimage krita-3.0-x86_64.appimage
`````
All Firejail sandboxing options should be available. A private home directory:
`````
$ firejail --appimage --private krita-3.0-x86_64.appimage
`````
or some basic X11 sandboxing:
`````
$ firejail --appimage --net=none --x11 krita-3.0-x86_64.appimage
`````
Major software applications distributing AppImage packages:
* Krita: https://krita.org/download/krita-desktop/
* OpenShot: http://www.openshot.org/download/
* Scribus: https://www.scribus.net/downloads/unstable-branch/
* MuseScore: https://musescore.org/en/download
More packages build by AppImage developer Simon Peter: https://bintray.com/probono/AppImages
AppImage project home: https://github.com/probonopd/AppImageKit
## Sandbox auditing
`````
AUDIT
Audit feature allows the user to point out gaps in security profiles.
The implementation replaces the program to be sandboxed with a test
program. By default, we use faudit program distributed with Firejail. A
custom test program can also be supplied by the user. Examples:
Running the default audit program:
$ firejail --audit transmission-gtk
Running a custom audit program:
$ firejail --audit=~/sandbox-test transmission-gtk
In the examples above, the sandbox configures transmission-gtk profile
and starts the test program. The real program, transmission-gtk, will
not be started.
Limitations: audit feature is not implemented for --x11 commands.
`````
## --noexec
`````
--noexec=dirname_or_filename
Remount directory or file noexec, nodev and nosuid.
Example:
$ firejail --noexec=/tmp
/etc and /var are noexec by default. If there are more than one
mount operation on the path of the file or directory, noexec
should be applied to the last one. Always check if the change
took effect inside the sandbox.
`````
## --rmenv
`````
--rmenv=name
Remove environment variable in the new sandbox.
Example:
$ firejail --rmenv=DBUS_SESSION_BUS_ADDRESS
`````
## Converting profiles to private-bin - work in progress!
BitTorrent: deluge, qbittorrent, rtorrent, transmission-gtk, transmission-qt, uget-gtk
File transfer: filezilla
Media: vlc, mpv, gnome-mplayer, audacity, rhythmbox, spotify, xplayer, xviewer
Office: evince, gthumb, fbreader, pix, atril, xreader
Chat/messaging: qtox, gitter, pidgin
Games: warzone2100
Weather/climate: aweather
Astronomy: gpredict, stellarium
Browsers: Palemoon
## New security profiles
Gitter, gThumb, mpv, Franz messenger, LibreOffice, pix, audacity, strings, xz, xzdec, gzip, cpio, less, Atom Beta, Atom, jitsi
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