nsjail/configs/firefox-with-net.cfg

name: "firefox-with-net"
description: "
This policy allows to run firefox inside a jail. Access to networking is
permitted with this setup (clone_newnet: false).

The only permitted home directory is $HOME/.mozilla and $HOME/Documents.
The rest of available on the FS files/dires are libs and X-related files/dirs.

Run as:

./nsjail --config configs/firefox-with-net.cfg

You can then go to https://uploadfiles.io/ and try to upload a file in order
to see how your local directory (also, all system directories) look like.
"

mode: ONCE
hostname: "FIREFOX"
cwd: "/user"

time_limit: 0

envar: "HOME=/user"
envar: "DISPLAY=:0"
envar: "TMP=/tmp"

rlimit_as: 4096
rlimit_cpu: 1000
rlimit_fsize: 1024
rlimit_nofile: 128

clone_newnet: false

mount {
	dst: "/proc"
	fstype: "proc"
}

mount {
	src: "/lib"
	dst: "/lib"
	is_bind: true
}

mount {
	src: "/usr/lib"
	dst: "/usr/lib"
	is_bind: true
}

mount {
	src: "/lib64"
	dst: "/lib64"
	is_bind: true
	mandatory: false
}

mount {
	src: "/lib32"
	dst: "/lib32"
	is_bind: true
	mandatory: false
}

mount {
	src: "/usr/lib/firefox"
	dst: "/usr/lib/firefox"
	is_bind: true
}

mount {
	src: "/usr/bin/firefox"
	dst: "/usr/bin/firefox"
	is_bind: true
}

mount {
	src: "/usr/share"
	dst: "/usr/share"
	is_bind: true
}

mount {
	src: "/dev/urandom"
	dst: "/dev/urandom"
	is_bind: true
	rw: true
}

mount {
	src: "/etc/resolv.conf"
	dst: "/etc/resolv.conf"
	is_bind: true
	mandatory: false
}

mount {
	dst: "/tmp"
	fstype: "tmpfs"
	rw: true
	is_bind: false
}

mount {
	dst: "/dev/shm"
	fstype: "tmpfs"
	rw: true
	is_bind: false
}

mount {
	dst: "/user"
	fstype: "tmpfs"
	rw: true
}

mount {
	prefix_src_env: "HOME"
	src: "/Documents"
	dst: "/user/Documents"
	rw: true
	is_bind: true
	mandatory: false
}

mount {
	prefix_src_env: "HOME"
	src: "/.mozilla"
	dst: "/user/.mozilla"
	is_bind: true
	rw: true
	mandatory: false
}

mount {
	src: "/tmp/.X11-unix/X0"
	dst: "/tmp/.X11-unix/X0"
	is_bind: true
}

seccomp_string: "
	POLICY example {
		KILL {
			ptrace,
			process_vm_readv,
			process_vm_writev
		}
	}
	USE example DEFAULT ALLOW
"

exec_bin {
        path: "/usr/lib/firefox/firefox"
}