FIREJAIL-PROFILE(5)

NAME
profile - Security profile file syntax, and information about building new application profiles.

SYNOPSIS
Using a specific profile:

    firejail --profile=filename.profile
        Example:
        $ firejail --appimage --profile=/etc/firejail/kdenlive.profile kdenlive.appimage

    firejail --profile=profile_name
        Example:
        $ firejail --appimage --profile=kdenlive kdenlive.appimage

Building a profile manually:

    Start with the template in /usr/share/doc/firejail/profile.template and modify it in a text editor. To integrate the program in your desktop environment copy the profile file in ~/.config/firejail directory and run "sudo firecfg".

Aliases and redirections:

    In some cases the same profile can be used for several applications. One such example is LibreOffice. Build a regular profile for the main application, and for the rest use /usr/share/doc/firejail/redirect_alias-profile.template.

Running the profile builder:

    firejail --build=appname.profile appname
        Example:
        $ firejail --build=blobby.profile /usr/bin/blobby
        Run the program in "firejail --build" and try to exercise as many program features as possible. The profile is extracted and saved in the current directory. Open it in a text editor and add or remove sandboxing options as necessary. Test again after modifying the profile. To integrate the program in your desktop environment copy the profile file in ~/.config/firejail directory and run "sudo firecfg".

DESCRIPTION
Several command line options can be passed to the program using profile files. Firejail chooses the profile file as follows: 1. If a profile file is provided by the user with --profile option, the profile file is loaded. If a profile name is given, it is searched for first in the ~/.config/firejail directory and if not found then in /etc/firejail directory. Profile names do not include the .profile suffix. Example:

    $ firejail --profile=/home/netblue/icecat.profile /usr/bin/icecat
    Reading profile /home/netblue/icecat.profile
    [...]

    $ firejail --profile=icecat /usr/bin/icecat-wrapper.sh
    Reading profile /etc/firejail/icecat.profile
    [...]
2. If a profile file with the same name as the application is present in ~/.config/firejail directory or in /etc/firejail, the profile is loaded. ~/.config/firejail takes precedence over /etc/firejail. Example:

    $ firejail /usr/bin/icecat
    Command name #icecat#
    Found icecat profile in /home/netblue/.config/firejail directory
    Reading profile /home/netblue/.config/firejail/icecat.profile
    [...]
3. Use a default.profile file if the sandbox is started by a regular user, or a server.profile file if the sandbox is started by root. Firejail looks for these files in ~/.config/firejail directory, followed by /etc/firejail directory. To disable default profile loading, use --noprofile command option. Example:

    $ firejail
    Reading profile /etc/firejail/default.profile
    Parent pid 8553, child pid 8554
    Child process initialized
    [...]
    $ firejail --noprofile
    Parent pid 8553, child pid 8554
    Child process initialized
    [...]

Templates
In /usr/share/doc/firejail there are two templates to write new profiles.
    profile.template - for regular profiles
    redirect_alias-profile.template - for aliasing/redirecting profiles

Scripting
Scripting commands:

File and directory names
    File and directory names containing spaces are supported. The space character ' ' should not be escaped. Example: "blacklist ~/My Virtual Machines"

# this is a comment
    Example: # disable networking
    net none # this command creates an empty network namespace

?CONDITIONAL: profile line
    Conditionally add profile line. Example: "?HAS_APPIMAGE: whitelist ${HOME}/special/appimage/dir" This example will load the whitelist profile line only if the --appimage option has been specified on the command line. Currently the only conditionals supported this way are HAS_APPIMAGE, HAS_NET, HAS_NODBUS, HAS_NOSOUND, HAS_PRIVATE and HAS_X11. The conditionals ALLOW_TRAY, BROWSER_DISABLE_U2F and BROWSER_ALLOW_DRM can be enabled or disabled globally in Firejail's configuration file. The profile line may be any profile line that you would normally use in a profile except for "quiet" and "include" lines. Note: When using one or more conditionals and --profile, it is recommended that the relevant option(s) (such as --appimage) be specified before --profile, so that their respective conditional(s) (such as ?HAS_APPIMAGE) inside of the profile evaluate to true.

include other.profile
    Include other.profile file. Example: "include /etc/firejail/disable-common.inc" The file name can be prefixed with a macro such as ${HOME} or ${CFG}. ${HOME} is expanded as user home directory, and ${CFG} is expanded as Firejail system configuration directory - in most cases /etc/firejail or /usr/local/etc/firejail. Example: "include ${HOME}/myprofiles/profile1" will load "~/myprofiles/profile1" file. Example: "include ${CFG}/firefox.profile" will load "/etc/firejail/firefox.profile" file. The file name may also be just the name without the leading directory components. In this case, first the user config directory (${HOME}/.config/firejail) is searched for the file name and if not found then the system configuration directory is search for the file name. Note: Unlike the --profile option which takes a profile name without the '.profile' suffix, include must be given the full file name. Example: "include firefox.profile" will load "${HOME}/.config/firejail/firefox.profile" file and if it does not exist "${CFG}/firefox.profile" will be loaded. System configuration files in ${CFG} are overwritten during software installation. Persistent configuration at system level is handled in ".local" files. For every profile file in ${CFG} directory, the user can create a corresponding .local file storing modifications to the persistent configuration. Persistent .local files are included at the start of regular profile files.

noblacklist file_name
    If the file name matches file_name, the file will not be blacklisted in any blacklist commands that follow. Example: "noblacklist ${HOME}/.mozilla"

nowhitelist file_name
    If the file name matches file_name, the file will not be whitelisted in any whitelist commands that follow. Example: "nowhitelist ~/.config"

ignore
    Ignore command. Example: "ignore seccomp"
    Example: "ignore net eth0"

quiet
    Disable Firejail's output. This should be the first uncommented command in the profile file. Example: "quiet"

warn message
    Print a warning message to stderr. Everything after the command is printed in a warning message as is (that is, without macro expansion). Example: "warn This file is deprecated; use foo instead."

Filesystem
These profile entries define a chroot filesystem built on top of the existing host filesystem. Each line describes a file/directory that is inaccessible (blacklist), a read-only file or directory (read-only), a tmpfs mounted on top of an existing directory (tmpfs), or mount-bind a directory or file on top of another directory or file (bind). Use private to set private mode. File globbing is supported, and PATH and HOME directories are searched, see the firejail(1) FILE GLOBBING section for more details. Examples:

blacklist file_or_directory
    Blacklist directory or file. This makes a file or directory completely inaccessible. All other files and directories are unaffected. The blacklisted file or directory is still visible on the filesystem, even if it's inaccessible.
    Symbolic link handling: Blacklisting a path that is a symbolic link will also blacklist the path that it points to. For example, if ~/foo is blacklisted and it points to /bar, then /bar will also be blacklisted.
    Examples:
    blacklist /usr/bin
    blacklist /usr/bin/gcc*
    blacklist ${PATH}/ifconfig
    blacklist ${HOME}/.ssh

blacklist-nolog file_or_directory
    When --tracelog flag is set, blacklisting generates syslog messages if the sandbox tries to access the file or directory. blacklist-nolog command disables syslog messages for this particular file or directory. Examples:
    blacklist-nolog /usr/bin
    blacklist-nolog /usr/bin/gcc*

bind directory1,directory2
    Mount-bind directory1 on top of directory2. This option is only available when running as root.

bind file1,file2
    Mount-bind file1 on top of file2. This option is only available when running as root.

disable-mnt
    Disable /mnt, /media, /run/mount and /run/media access.

keep-config-pulse
    Disable automatic ~/.config/pulse init, for complex setups such as remote pulse servers or non-standard socket paths.

keep-dev-ntsync
    Allow access to the /dev/ntsync character device (even with private-dev), which is blocked by default. This device is mostly intended to increase performance and compatibility when running certain programs through Wine.

keep-dev-shm
    /dev/shm directory is untouched (even with private-dev).

keep-dev-tpm
    Allow access to Trusted Cryptography Module (TCM) and Trusted Platform Module (TPM) devices (even with private-dev), which are blocked by default.

keep-shell-rc
    Do not copy shell rc files (such as ~/.bashrc and ~/.zshrc) from /etc/skel.

keep-var-tmp
    /var/tmp directory is untouched.

mkdir directory
    Create a directory in user home, under /tmp, or under /run/user/<UID> before the sandbox is started. The directory is created if it doesn't already exist.
    Use this command for whitelisted directories you need to preserve when the sandbox is closed. Without it, the application will create the directory, and the directory will be deleted when the sandbox is closed. Subdirectories are recursively created. Example from firefox profile:
    mkdir ~/.mozilla
    whitelist ~/.mozilla
    mkdir ~/.cache/mozilla/firefox
    whitelist ~/.cache/mozilla/firefox
    For files in /run/user/<PID> use ${RUNUSER} macro:
    mkdir ${RUNUSER}/firejail-testing

mkfile file
    Similar to mkdir, this command creates an empty file in user home, or /tmp, or under /run/user/<UID> before the sandbox is started. The file is created if it doesn't already exist.

noexec file_or_directory
    Remount the file or the directory noexec, nodev and nosuid.

private
    Mount new /root and /home/user directories in temporary filesystems. All modifications are discarded when the sandbox is closed.

private directory
    Use directory as user home. --private and --private=directory cannot be used together.
    Bug: Even with this enabled, some firejail commands (such as mkdir, mkfile and private-cache) will still operate on the original home directory. Workaround: Disable the incompatible commands, such as by using "ignore mkdir" and "ignore mkfile". For details, see #903 (https://github.com/netblue30/firejail/issues/903).

private-bin file,file
    Build a new /bin in a temporary filesystem, and copy the programs in the list. The files in the list must be expressed as relative to the /bin, /sbin, /usr/bin, /usr/sbin, or /usr/local/bin directories. The same directory is also bind-mounted over /sbin, /usr/bin and /usr/sbin. Multiple private-bin commands are allowed and they accumulate.

private-cache
    Mount an empty temporary filesystem on top of the .cache directory in user home. All modifications are discarded when the sandbox is closed.

private-cwd
    Set working directory inside jail to the home directory, and failing that, the root directory.

private-cwd directory
    Set working directory inside the jail. Full directory path is required. Symbolic links are not allowed.

private-dev
    Create a new /dev directory. Only disc, dri, dvb, full, hidraw, log, null, ptmx, pts, random, shm, snd, tty, urandom, usb, video and zero devices are available. Use the options no3d, nodvd, nosound, notv, nou2f and novideo for additional restrictions.

private-etc file,directory
    Build a new /etc in a temporary filesystem, and copy the files and directories in the list. The files and directories in the list must be expressed as relative to the /etc directory, and must not contain the / character (e.g., /etc/foo must be expressed as foo, but /etc/foo/bar -- expressed as foo/bar -- is disallowed). All modifications are discarded when the sandbox is closed. Multiple private-etc commands are allowed and they accumulate.

private-home file,directory
    Build a new user home in a temporary filesystem, and copy the files and directories in the list in the new home. The files and directories in the list must be expressed as relative to the current user's home directory. All modifications are discarded when the sandbox is closed.

private-opt file,directory
    Build a new /opt in a temporary filesystem, and copy the files and directories in the list. The files and directories in the list must be expressed as relative to the /opt directory, and must not contain the / character (e.g., /opt/foo must be expressed as foo, but /opt/foo/bar -- expressed as foo/bar -- is disallowed). All modifications are discarded when the sandbox is closed.

private-srv file,directory
    Build a new /srv in a temporary filesystem, and copy the files and directories in the list. The files and directories in the list must be expressed as relative to the /srv directory, and must not contain the / character (e.g., /srv/foo must be expressed as foo, but /srv/foo/bar -- expressed as foo/bar -- is disallowed). All modifications are discarded when the sandbox is closed.

private-tmp
    Mount an empty temporary filesystem on top of /tmp directory whitelisting /tmp/.X11-unix.

read-only file_or_directory
    Make directory or file read-only.

read-write file_or_directory
    Make directory or file read-write.

tmpfs directory
    Mount an empty tmpfs filesystem on top of directory. Directories outside user home or not owned by the user are not allowed. Sandboxes running as root are exempt from these restrictions.

tracelog
    Blacklist violations logged to syslog.

whitelist file_or_directory
    Whitelist directory or file. A temporary file system is mounted on the top directory. In the context of firejail, top directory means, if the whitelisted file's path is for example /etc/somedir/somefile, then the top directory would be /etc. All other top directories like /opt, /usr and so on, haven't changed, so all files there are still accessible, unless a file or directory inside them is also whitelisted. This is why sometimes it's beneficial to use blacklist in combination with whitelist, if used for different top directories.
    The whitelisted files are mount-binded inside. Modifications to whitelisted files are persistent, everything else in the same top directory is discarded when the sandbox is closed.
    The top directory can be most directories in /, but there are some special cases. The /proc and /sys top directories aren't allowed, but /sys/module is allowed. Also /run/user/$UID, $HOME and all directories in /usr are treated as a top directory.
    Symbolic link handling: Whitelisting a path that is a symbolic link will also whitelist the path that it points to. For example, if ~/foo is whitelisted and it points to ~/bar, then ~/bar will also be whitelisted.
    Restrictions: With the exception of the user home directory, both the link and the real file should be in the same top directory. For symbolic links in the user home directory, both the link and the real file should be owned by the user.

whitelist-ro file_or_directory
    Equivalent to "whitelist file_or_directory" followed by "read-only file_or_directory"

writable-etc
    Mount /etc directory read-write.

writable-run-user
    Disable the default blacklisting of run/user/$UID/systemd and /run/user/$UID/gnupg.

writable-var
    Mount /var directory read-write.

writable-var-log
    Use the real /var/log directory, not a clone. By default, a tmpfs is mounted on top of /var/log directory, and a skeleton filesystem is created based on the original /var/log.

Security filters
The following security filters are currently implemented:

allow-bwrap
    Allow bubblewrap sandbox inside Firejail sandbox. By default Firejail replaces /usr/bin/bwrap executable with a do-nothing program.

allow-debuggers
    Allow tools such as strace and gdb inside the sandbox by whitelisting system calls ptrace and process_vm_readv.

apparmor
    Enable AppArmor confinement with the "firejail-default" AppArmor profile.

apparmor profile_name
    Enable AppArmor confinement with a custom AppArmor profile. Note that the profile in question must already be loaded into the kernel.

caps
    Enable default Linux capabilities filter. See capabilities(7) for details.

caps.drop capability,capability,capability
    Blacklist given Linux capabilities.

caps.drop all
    Blacklist all Linux capabilities.

caps.keep capability,capability,capability
    Whitelist given Linux capabilities.

landlock.enforce (experimental)
    Enforce the Landlock ruleset. Without it, the other Landlock commands have no effect.

landlock.fs.read path (experimental)
    Create a Landlock ruleset (if it doesn't already exist) and add a read access rule for path.

landlock.fs.write path (experimental)
    Create a Landlock ruleset (if it doesn't already exist) and add a write access rule for path.

landlock.fs.makeipc path (experimental)
    Create a Landlock ruleset (if it doesn't already exist) and add a rule that allows the creation of named pipes (FIFOs) and Unix domain sockets beneath the given path.

landlock.fs.makedev path (experimental)
    Create a Landlock ruleset (if it doesn't already exist) and add a rule that allows the creation of block devices and character devices beneath the given path.

landlock.fs.execute path (experimental)
    Create a Landlock ruleset (if it doesn't already exist) and add an execution permission rule for path.

memory-deny-write-execute
    Install a seccomp filter to block attempts to create memory mappings that are both writable and executable, to change mappings to be executable or to create executable shared memory.

nonewprivs
    Sets the NO_NEW_PRIVS prctl. This ensures that child processes cannot acquire new privileges using execve(2); in particular, this means that calling a suid binary (or one with file capabilities) does not result in an increase of privilege.

noprinters
    Disable printers.

noroot
    Use this command to enable an user namespace. The namespace has only one user, the current user. There is no root account (uid 0) defined in the namespace.

protocol protocol1,protocol2,protocol3
    Enable protocol filter. The filter is based on seccomp and checks the first argument to socket system call. Recognized values: unix, inet, inet6, netlink, packet, and bluetooth. Multiple protocol commands are allowed and they accumulate.

restrict-namespaces
    Install a seccomp filter that blocks attempts to create new cgroup, ipc, net, mount, pid, time, user or uts namespaces.

restrict-namespaces cgroup,ipc,net,mnt,pid,time,user,uts
    Install a seccomp filter that blocks attempts to create any of the specified namespaces.

seccomp
    Enable seccomp filter and blacklist the syscalls in the default list. See man 1 firejail for more details.

seccomp.32
    Enable seccomp filter and blacklist the syscalls in the default list for 32 bit system calls on a 64 bit architecture system.

seccomp syscall,syscall,syscall
    Enable seccomp filter and blacklist the system calls in the list on top of default seccomp filter.

seccomp.32 syscall,syscall,syscall
    Enable seccomp filter and blacklist the system calls in the list on top of default seccomp filter for 32 bit system calls on a 64 bit architecture system.

seccomp.block-secondary
    Enable seccomp filter and filter system call architectures so that only the native architecture is allowed.

seccomp.drop syscall,syscall,syscall
    Enable seccomp filter and blacklist the system calls in the list.

seccomp.32.drop syscall,syscall,syscall
    Enable seccomp filter and blacklist the system calls in the list for 32 bit system calls on a 64 bit architecture system.

seccomp.keep syscall,syscall,syscall
    Enable seccomp filter and whitelist the system calls in the list.

seccomp.32.keep syscall,syscall,syscall
    Enable seccomp filter and whitelist the system calls in the list for 32 bit system calls on a 64 bit architecture system.

seccomp-error-action kill | log | ERRNO
    Return a different error instead of EPERM to the process, kill it when an attempt is made to call a blocked system call, or allow but log the attempt.

x11 Enable X11 sandboxing.

x11 none
    Blacklist /tmp/.X11-unix directory, ${HOME}/.Xauthority and file specified in ${XAUTHORITY} environment variable. Remove DISPLAY and XAUTHORITY environment variables. Stop with error message if X11 abstract socket will be accessible in jail.

x11 xephyr
    Enable X11 sandboxing with Xephyr server.

x11 xorg
    Enable X11 sandboxing with X11 security extension.

x11 xpra
    Enable X11 sandboxing with Xpra server.

x11 xvfb
    Enable X11 sandboxing with Xvfb server.

xephyr-extra-params OPTIONS
    Set Xephyr server command extra parameters for x11 xephyr. This command should be included in the profile file before x11 xephyr command.
    Example:
    xephyr-extra-params -grayscale
    x11 xephyr

xephyr-screen WIDTHxHEIGHT
    Set screen size for x11 xephyr. This command should be included in the profile file before x11 xephyr command.
    Example:
    xephyr-screen 640x480
    x11 xephyr

DBus filtering
Access to the session and system DBus UNIX sockets can be allowed, filtered or disabled. To disable the abstract sockets (and force applications to use the filtered UNIX socket) you would need to request a new network namespace using --net command. Another option is to remove unix from the --protocol set.
Filtering requires installing the xdg-dbus-proxy utility. Filter rules can be specified for well-known DBus names, but they are also propagated to the owning unique name, too. The permissions are "sticky" and are kept even if the corresponding well-known name is released (however, applications rarely release well-known names in practice). Names may have a .* suffix to match all names underneath them, including themselves (e.g. "foo.bar.*" matches "foo.bar", "foo.bar.baz" and "foo.bar.baz.quux", but not "foobar"). For more information, see xdg-dbus-proxy(1).
Examples:

dbus-system filter
    Enable filtered access to the system DBus. Filters can be specified with the dbus-system.talk and dbus-system.own commands.

dbus-system none
    Disable access to the system DBus. Once access is disabled, it cannot be relaxed to filtering.

dbus-system.broadcast org.freedesktop.Notifications=org.freedesktop.Notifications.*@/org/freedesktop/Notifications
    Allow the application to receive broadcast signals from the interface org.freedesktop.Notifications of the object exposed at the path /org/freedesktop/Notifications by the client owning the bus name org.freedesktop.Notifications on the system DBus.

dbus-system.call org.freedesktop.Notifications=org.freedesktop.Notifications.*@/org/freedesktop/Notifications
    Allow the application to call methods of the interface org.freedesktop.Notifications of the object exposed at the path /org/freedesktop/Notifications by the client owning the bus name org.freedesktop.Notifications on the system DBus.

dbus-system.own org.gnome.ghex.*
    Allow the application to own the name org.gnome.ghex and all names underneath in on the system DBus.

dbus-system.see org.freedesktop.Notifications
    Allow the application to see but not talk to the name org.freedesktop.Notifications on the system DBus.

dbus-system.talk org.freedesktop.Notifications
    Allow the application to talk to the name org.freedesktop.Notifications on the system DBus.

dbus-user filter
    Enable filtered access to the session DBus. Filters can be specified with the dbus-user.talk and dbus-user.own commands.

dbus-user none
    Disable access to the session DBus. Once access is disabled, it cannot be relaxed to filtering.

dbus-user.broadcast org.freedesktop.Notifications=org.freedesktop.Notifications.*@/org/freedesktop/Notifications
    Allow the application to receive broadcast signals from the the interface org.freedesktop.Notifications of the object exposed at the path /org/freedesktop/Notifications by the client owning the bus name org.freedesktop.Notifications on the session DBus.

dbus-user.call org.freedesktop.Notifications=org.freedesktop.Notifications.*@/org/freedesktop/Notifications
    Allow the application to call methods of the interface org.freedesktop.Notifications of the object exposed at the path /org/freedesktop/Notifications by the client owning the bus name org.freedesktop.Notifications on the session DBus.

dbus-user.own org.gnome.ghex.*
    Allow the application to own the name org.gnome.ghex and all names underneath in on the session DBus.

dbus-user.see org.freedesktop.Notifications
    Allow the application to see but not talk to the name org.freedesktop.Notifications on the session DBus.

dbus-user.talk org.freedesktop.Notifications
    Allow the application to talk to the name org.freedesktop.Notifications on the session DBus.

nodbus (deprecated)
    Disable D-Bus access (both system and session buses). Equivalent to dbus-system none and dbus-user none.

Individual filters can be overridden via the --ignore command. Supposing a profile has
    [...]
    dbus-user filter
    dbus-user.own org.mozilla.firefox.*
    dbus-user.talk org.freedesktop.Notifications
    dbus-system none
    [...]
    and the user wants to disable notifications, this can be achieved by putting the below in a local override file:
    [...]
    ignore dbus-user.talk org.freedesktop.Notifications
    [...]

Resource limits, CPU affinity
These profile entries define the limits on system resources (rlimits) for the processes inside the sandbox. The limits can be modified inside the sandbox using the regular ulimit command. cpu command configures the CPU cores available. Examples:

cpu 0,1,2
    Use only CPU cores 0, 1 and 2.

nice -5
    Set a nice value of -5 to all processes running inside the sandbox.

rlimit-as 123456789012
    Set the maximum size of the process's virtual memory to 123456789012 bytes.

rlimit-cpu 123
    Set the maximum CPU time in seconds.

rlimit-fsize 1024
    Set the maximum file size that can be created by a process to 1024 bytes.

rlimit-nproc 1000
    Set the maximum number of processes that can be created for the real user ID of the calling process to 1000.

rlimit-nofile 500
    Set the maximum number of files that can be opened by a process to 500.

rlimit-sigpending 200
    Set the maximum number of processes that can be created for the real user ID of the calling process to 200.

timeout hh:mm:ss
    Kill the sandbox automatically after the time has elapsed. The time is specified in hours/minutes/seconds format.

User Environment

allusers
    All user home directories are visible inside the sandbox. By default, only current user home directory is visible.

env name=value
    Set environment variable. Examples:
    env LD_LIBRARY_PATH=/opt/test/lib
    env CFLAGS="-W -Wall -Werror"

ipc-namespace
    Enable a new IPC namespace if the sandbox was started as a regular user. IPC namespace is enabled by default for sandboxes started as root.
    Note: This only affects the IPC resources that are mentioned in ipc_namespaces(7). It does not affect other IPC resources, such as Unix sockets (see unix(7)).

keep-fd
    Inherit open file descriptors to sandbox.

name sandboxname
    Set sandbox name. Example:
    name browser

no3d
    Disable 3D hardware acceleration.

noautopulse (deprecated)
    See keep-config-pulse.

nodvd
    Disable DVD and audio CD devices.

nogroups
    Disable supplementary user groups

noinput
    Disable input devices.

nosound
    Disable sound system.

notpm (deprecated)
    Ignored for compatibility.
    TPM devices are now blocked by default, see keep-dev-tpm.

notv
    Disable DVB (Digital Video Broadcasting) TV devices.

nou2f
    Disable U2F devices.

novideo
    Disable video capture devices.

machine-id
    Spoof id number in /etc/machine-id file - a new random id is generated inside the sandbox.

Networking
Networking features available in profile files.

defaultgw address
    Use this address as default gateway in the new network namespace.

dns address
    Set a DNS server for the sandbox. Up to three DNS servers can be defined.

hostname name
    Set a hostname for the sandbox.

hostname-randomize
    Set sandbox hostname to a random value generated by firejail.

hosts-file file
    Use file as /etc/hosts.

ip address
    Assign IP addresses to the last network interface defined by a net command. A default gateway is assigned by default.
    Example:
    net eth0
    ip 10.10.20.56

ip dhcp
    Acquire an IP address and default gateway for the last interface defined by a net command, as well as set the DNS servers according to the DHCP response. This command requires the ISC dhclient DHCP client to be installed and will start it automatically inside the sandbox.
    Example:
    net br0
    ip dhcp
    This command should not be used in conjunction with the dns command if the DHCP server is set to configure DNS servers for the clients, because the manually specified DNS servers will be overwritten.
    The DHCP client will NOT release the DHCP lease when the sandbox terminates. If your DHCP server requires leases to be explicitly released, consider running a DHCP client and releasing the lease manually in conjunction with the net none command.

ip none
    No IP address and no default gateway are configured for the last interface defined by a net command. Use this option in case you intend to start an external DHCP client in the sandbox.
    Example:
    net eth0
    ip none

ip6 address
    Assign IPv6 addresses to the last network interface defined by a net command.
    Example:
    net eth0
    ip6 2001:0db8:0:f101::1/64

ip6 dhcp
    Acquire an IPv6 address and default gateway for the last interface defined by a net command, as well as set the DNS servers according to the DHCP response. This command requires the ISC dhclient DHCP client to be installed and will start it automatically inside the sandbox.
    Example:
    net br0
    ip6 dhcp
    This command should not be used in conjunction with the dns command if the DHCP server is set to configure DNS servers for the clients, because the manually specified DNS servers will be overwritten.
    The DHCP client will NOT release the DHCP lease when the sandbox terminates. If your DHCP server requires leases to be explicitly released, consider running a DHCP client and releasing the lease manually.

iprange address,address
    Assign an IP address in the provided range to the last network interface defined by a net command. A default gateway is assigned by default.
    Example:
    net eth0
    iprange 192.168.1.150,192.168.1.160

mac address
    Assign MAC addresses to the last network interface defined by a net command.

mtu number
    Assign a MTU value to the last network interface defined by a net command.

net bridge_interface
    Enable a new network namespace and connect it to this bridge interface. Unless specified with option --ip and --defaultgw, an IP address and a default gateway will be assigned automatically to the sandbox. The IP address is verified using ARP before assignment. The address configured as default gateway is the bridge device IP address. Up to four --net bridge devices can be defined. Mixing bridge and macvlan devices is allowed.

net ethernet_interface|wireless_interface
    Enable a new network namespace and connect it to this ethernet interface using the standard Linux macvlan or ipvlan driver. Unless specified with option --ip and --defaultgw, an IP address and a default gateway will be assigned automatically to the sandbox. The IP address is verified using ARP before assignment. The address configured as default gateway is the default gateway of the host. Up to four --net devices can be defined. Mixing bridge and macvlan devices is allowed.

net none
    Enable a new, unconnected network namespace. The only interface available in the new namespace is a new loopback interface (lo). Use this option to deny network access to programs that don't really need network access.

net tap_interface
    Enable a new network namespace and connect it to this ethernet tap interface using the standard Linux macvlan driver. If the tap interface is not configured, the sandbox will not try to configure the interface inside the sandbox. Please use ip, netmask and defaultgw to specify the configuration.

netfilter
    If a new network namespace is created, enabled default network filter.

netfilter filename
    If a new network namespace is created, enabled the network filter in filename.

netlock
    Generate a custom network filter and enable it.

netmask address
    Use this option when you want to assign an IP address in a new namespace and the parent interface specified by --net is not configured. An IP address and a default gateway address also have to be added.

netns namespace
    Run the program in a named, persistent network namespace. These can be created and configured using "ip netns".

veth-name name
    Use this name for the interface connected to the bridge for --net=bridge_interface commands, instead of the default one.

Other

deterministic-exit-code
    Always exit firejail with the first child's exit status. The default behavior is to use the exit status of the final child to exit, which can be nondeterministic.

deterministic-shutdown
    Always shut down the sandbox after the first child has terminated. The default behavior is to keep the sandbox alive as long as it contains running processes.

join-or-start sandboxname
    Join the sandbox identified by name or start a new one. Same as "firejail --join=sandboxname" command if sandbox with specified name exists, otherwise same as "name sandboxname".

FILES

/etc/firejail/appname.profile
    Global Firejail configuration consisting mainly of profiles for each application supported by default.

$HOME/.config/firejail/appname.profile
    User application profiles, will take precedence over the global profiles.

/usr/share/doc/firejail/profile.template
    Template for building new profiles.

/usr/share/doc/firejail/redirect_alias-profile.template
    Template for aliasing/redirecting profiles.

LICENSE
Firejail 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

SEE ALSO
firejail(1), firemon(1), firecfg(1), firejail-login(5), firejail-users(5), jailcheck(1) https://github.com/netblue30/firejail/wiki/Creating-Profiles