jailcheck - Simple utility program to test running sandboxes

sudo jailcheck [OPTIONS] [directory]

jailcheck attaches itself to all sandboxes started by the user and performs some basic tests on the sandbox filesystem:
1. Virtual directories
jailcheck extracts a list with the main virtual directories installed by the sandbox. These directories are build by firejail at startup using --private* and --whitelist commands.
2. Noexec test
jailcheck inserts executable programs in /home/username, /tmp, and /var/tmp directories and tries to run them from inside the sandbox, thus testing if the directory is executable or not.
3. Read access test
jailcheck creates test files in the directories specified by the user and tries to read them from inside the sandbox.
4. AppArmor test
5. Seccomp test
6. Networking test
The program is started as root using sudo.

Print debug messages.
-?, --help
Print options and exit.
Print program version and exit.
One or more directories in user home to test for read access. ~/.ssh and ~/.gnupg are tested by default.

For each sandbox detected we print the following line:

PID:USER:Sandbox Name:Command

It is followed by relevant sandbox information, such as the virtual directories and various warnings.

$ sudo jailcheck
2014:netblue::firejail /usr/bin/gimp Virtual dirs: /tmp, /var/tmp, /dev, /usr/share, Warning: I can run programs in /home/netblue Networking: disabled

2055:netblue::firejail /usr/bin/ssh -X netblue@x.y.z.net Virtual dirs: /var/tmp, /dev, /usr/share, /run/user/1000, Warning: I can read ~/.ssh Networking: enabled

2186:netblue:libreoffice:firejail --appimage /opt/LibreOffice-fresh.appimage Virtual dirs: /tmp, /var/tmp, /dev, Networking: enabled

26090:netblue::/usr/bin/firejail /opt/firefox/firefox Virtual dirs: /home/netblue, /tmp, /var/tmp, /dev, /etc, /usr/share, /run/user/1000, Networking: enabled

26160:netblue:tor:firejail --private=~/tor-browser_en-US ./start-tor Warning: AppArmor not enabled Virtual dirs: /home/netblue, /tmp, /var/tmp, /dev, /etc, /bin, /usr/share, /run/user/1000, Warning: I can run programs in /home/netblue Networking: enabled

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

Homepage: https://firejail.wordpress.com

firejail(1), firemon(1), firecfg(1), firejail-profile(5), firejail-login(5), firejail-users(5),
Aug 2021 0.9.66