Provided by: firejail_0.9.72-2ubuntu3_amd64 bug

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

SEE ALSO

       firejail(1), firemon(1), firecfg(1), firejail-login(5), firejail-users(5), jailcheck(1)

       ⟨https://github.com/netblue30/firejail/wiki/Creating-Profiles⟩