Ubuntu Manpage: profile - Security profile file syntax, and information about building new application

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 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 icecat
Reading profile /home/netblue/icecat.profile
[...]

$ firejail --profile=icecat 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 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"

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 FILE GLOBBING section for more details.
Examples:

blacklist file_or_directory
Blacklist directory or file. 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-shm
/dev/shm directory is untouched (even with private-dev).

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 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, hidraw, null, full, zero, tty,
pts, ptmx, random, snd, urandom, video, log, shm and usb 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-lib file,directory
Build a new /lib directory and bring in the libraries required by the application
to run. The files and directories in the list must be expressed as relative to the
/lib directory. This feature is still under development, see man 1 firejail for
some examples.

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, and the whitelisted files are mount-binded inside. Modifications to
whitelisted files are persistent, everything else is discarded when the sandbox is
closed. The top directory can be all directories in / (except /proc and /sys),
/sys/module, /run/user/$UID, $HOME and all directories in /usr.

Symbolic link handling: with the exception of user home, both the link and the real
file should be in the same top directory. For user home, 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-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.

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-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.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.talk org.freedesktop.Notifications
Allow the application to talk to the name org.freedesktop.Notifications 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.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.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-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.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.talk org.freedesktop.Notifications
Allow the application to talk to the name org.freedesktop.Notifications 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.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.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.

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 IPC namespace.

       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.

       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.

       shell none
              Run the program directly, without a shell.

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.

       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 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

       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.

       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