From: Ralf Jung Date: Sun, 14 Apr 2024 10:20:50 +0000 (+0200) Subject: initial commit X-Git-Url: https://git.ralfj.de/bubblebox.git/commitdiff_plain/0778e2d24706e9287d0594336cd5907b022e6ce8 initial commit --- 0778e2d24706e9287d0594336cd5907b022e6ce8 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..76dc969 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +__pycache__ +*jail diff --git a/LICENSE-GPL2 b/LICENSE-GPL2 new file mode 100644 index 0000000..d159169 --- /dev/null +++ b/LICENSE-GPL2 @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License along + with this program; if not, write to the Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/bubblebox.py b/bubblebox.py new file mode 100644 index 0000000..1af0c87 --- /dev/null +++ b/bubblebox.py @@ -0,0 +1,91 @@ +import sys, os, glob, random, string, subprocess +from pprint import pprint + +HOME = os.environ["HOME"] +XDG_RUNTIME_DIR = os.environ["XDG_RUNTIME_DIR"] +BUBBLEBOX_DIR = XDG_RUNTIME_DIR + "/bubblebox" +os.makedirs(BUBBLEBOX_DIR, exist_ok=True) + +def flat_map(f, xs): + """Concatenate the result of applying `f` to each element of `xs` to a list. + `None` is treated like the empty list.""" + ys = [] + for x in xs: + x_mapped = f(x) + if x_mapped is not None: + ys.extend(x_mapped) + return ys + +def globexpand(base, names): + return flat_map(lambda x: glob.glob(base + "/" + x), names) + +def randname(): + # choose from all lowercase letter + letters = string.ascii_lowercase + return ''.join(random.choice(letters) for i in range(8)) + +class BoxFlags: + """Flags that configure the bubblebox""" + def __init__(self, bwrap_flags = None, dbus_proxy_flags = None): + self.bwrap_flags = bwrap_flags + self.dbus_proxy_flags = dbus_proxy_flags + +def launch_dbus_proxy(flags): + """Launches the dbus proxy and returns the bwrap flags to be used to talk to it.""" + # Prepare a pipe to coordinate shutdown of bwrap and the proxy + bwrap_end, other_end = os.pipe() # both FDs are "non-inheritable" now + # Invoke the debus-proxy + filename = BUBBLEBOX_DIR + "/bus-" + randname() + args = ["/usr/bin/xdg-dbus-proxy", "--fd="+str(other_end)] + args += [os.environ["DBUS_SESSION_BUS_ADDRESS"], filename, "--filter"] + flags + #pprint(args) + subprocess.Popen( + args, + pass_fds = [other_end], # default is to pass only the std FDs! + ) + # Wait until the proxy is ready + os.read(bwrap_end, 1) + assert os.path.exists(filename) + # Make sure bwrap can access the other end of the pipe + os.set_inheritable(bwrap_end, True) + # Put this at the usual location for the bus insode the sandbox. + # TODO: What if DBUS_SESSION_BUS_ADDRESS says something else? + return ["--bind", filename, XDG_RUNTIME_DIR + "/bus", "--sync-fd", str(bwrap_end)] + +# Constructors that should be used instead of directly mentioning the class above. +def bwrap_flags(*flags): + return BoxFlags(bwrap_flags=flags) +def dbus_proxy_flags(*flags): + return BoxFlags(dbus_proxy_flags=flags) +def collect_flags(*flags): + bwrap_flags = flat_map(lambda x: x.bwrap_flags, flags) + dbus_proxy_flags = flat_map(lambda x: x.dbus_proxy_flags, flags) + return BoxFlags(bwrap_flags, dbus_proxy_flags) + +# Run the application in the bubblebox with the given flags. +def bubblebox(*flags): + flags = collect_flags(*flags) + bwrap = "/usr/bin/bwrap" + extraflags = [] + if flags.dbus_proxy_flags: + extraflags += launch_dbus_proxy(flags.dbus_proxy_flags) + args = [bwrap] + flags.bwrap_flags + extraflags + ["--"] + sys.argv[1:] + #pprint(args) + os.execvp(args[0], args) + +# Convenient methods to give access to the host file system +def ro_host_access(*names): + return bwrap_flags(*flat_map(lambda x: ["--ro-bind", x, x], names)) +def rw_host_access(*names): + return bwrap_flags(*flat_map(lambda x: ["--bind", x, x], names)) +def dev_host_access(*names): + return bwrap_flags(*flat_map(lambda x: ["--dev-bind", x, x], names)) + +# Give all instances of the same box a shared XDG_RUNTIME_DIR +def shared_runtime_dir(boxname): + dirname = BUBBLEBOX_DIR + "/" + boxname + os.makedirs(dirname, exist_ok=True) + return bwrap_flags("--bind", dirname, XDG_RUNTIME_DIR) + +# Profile the profiles when importing bubblebox. +import profiles diff --git a/profiles.py b/profiles.py new file mode 100644 index 0000000..fdb2f67 --- /dev/null +++ b/profiles.py @@ -0,0 +1,35 @@ +from bubblebox import * + +# Various default sandbox settings +DEFAULT = collect_flags( + # general flags + bwrap_flags("--die-with-parent"), + # namespace unsharing + bwrap_flags("--unshare-all", "--share-net", "--hostname", "bwrapped"), + # basic directories + bwrap_flags("--proc", "/proc", "--dev", "/dev", "--dir", "/tmp", "--dir", "/var", "--dir", "/run", "--symlink", "../run", "/var/run"), + # an empty XDG_RUNTIME_DIR + bwrap_flags("--perms", "0700", "--dir", XDG_RUNTIME_DIR), + # merged-usr symlinks + bwrap_flags("--symlink", "usr/lib", "/lib", "--symlink", "usr/lib64", "/lib64", "--symlink", "usr/bin", "/bin", "--symlink", "usr/sbin", "/sbin"), + # folders we always need access to + ro_host_access("/usr", "/sys", "/etc"), + # make a basic shell work + ro_host_access(*globexpand(HOME, [".bashrc", ".bash_aliases", ".profile", "bin"])), +) + +# https://github.com/igo95862/bubblejail is a good source of paths that need allowing. +# We do not give access to pipewire, that needs a portal (https://docs.pipewire.org/page_portal.html). +DESKTOP = collect_flags( + # Access to screen and audio + dev_host_access("/dev/dri", "/dev/snd"), + ro_host_access("/tmp/.X11-unix/", os.environ["XAUTHORITY"]), + ro_host_access(*globexpand(XDG_RUNTIME_DIR, ["wayland*", "pulse"])), + # Access to some key global configuration + ro_host_access(*globexpand(HOME, [".config/fontconfig", ".XCompose"])), + # Access to basic d-bus services (that are hopefully safe to expose...) + dbus_proxy_flags("--talk=org.kde.StatusNotifierWatcher.*", "--talk=org.freedesktop.Notifications.*", "--talk=org.freedesktop.ScreenSaver.*", "--talk=org.freedesktop.portal.*"), + # Make it possible to open websites in Firefox + ro_host_access(*globexpand(HOME, [".mozilla/firefox/profiles.ini", ".local/share/applications"])), + dbus_proxy_flags("--talk=org.mozilla.firefox.*"), +)