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Blacklist dconf dbus

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Signed-off-by: Tommy <contact@tommytran.io>
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Tommy 2024-04-13 22:16:41 -07:00
parent e003699f05
commit fe158e7e04
Signed by: Tomster
GPG Key ID: 555C902A34EC968F
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8
content/posts/linux/Desktop Linux Hardening.md
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@ -102,8 +102,8 @@ Some sandboxing solutions for desktop Linux distributions do exist; however, the
You can restrict applications further by setting [Flatpak overrides](https://docs.flatpak.org/en/latest/flatpak-command-reference.html#flatpak-override). This can be done with the command&nbsp;line or by using [Flatseal](https://github.com/tchx84/Flatseal). To deny common dangerous Flatpak permissions globally, run the following commands:
```bash
sudo flatpak override --system --nosocket=x11 --nosocket=fallback-x11 --nosocket=pulseaudio --unshare=network --unshare=ipc --nofilesystem=host:reset --nodevice=input --nodevice=shm --nodevice=all --no-talk-name=org.freedesktop.Flatpak --no-talk-name=org.freedesktop.systemd1 --no-talk-name=org.gnome.Shell.Extensions
flatpak override --user --nosocket=x11 --nosocket=fallback-x11 --nosocket=pulseaudio --unshare=network --unshare=ipc --nofilesystem=host:reset --nodevice=input --nodevice=shm --nodevice=all --no-talk-name=org.freedesktop.Flatpak --no-talk-name=org.freedesktop.systemd1 --no-talk-name=org.gnome.Shell.Extensions
sudo flatpak override --system --nosocket=x11 --nosocket=fallback-x11 --nosocket=pulseaudio --unshare=network --unshare=ipc --nofilesystem=host:reset --nodevice=input --nodevice=shm --nodevice=all --no-talk-name=org.freedesktop.Flatpak --no-talk-name=org.freedesktop.systemd1 --no-talk-name=ca.desrt.dconf --no-talk-name=org.gnome.Shell.Extensions
flatpak override --user --nosocket=x11 --nosocket=fallback-x11 --nosocket=pulseaudio --unshare=network --unshare=ipc --nofilesystem=host:reset --nodevice=input --nodevice=shm --nodevice=all --no-talk-name=org.freedesktop.Flatpak --no-talk-name=org.freedesktop.systemd1 --no-talk-name=ca.desrt.dconf --no-talk-name=org.gnome.Shell.Extensions
```
To allow Flatseal to function after applying the overrides above, run the following command:
@ -122,8 +122,8 @@ Some sensitive permissions of note:
- `--talk-name=org.freedesktop.secrets`: D&#8209;Bus access to secrets stored on your keychain
- `--talk-name=org.freedesktop.Flatpak`: D&#8209;Bus access to run `flatpak run`. This D&#8209;Bus is a sandbox escape.
- `talk-name=org.freedesktop.systemd1`: D&#8209;Bus access to systemd. The D&#8209;Bus can be used to load in systemd services with arbitary code and run them.
- `--talk-name=org.gnome.Shell.Extensions`: D&#8209;Bus access to install and manage GNOME shell extensions
- `--talk-name=ca.desrt.dconf`: D&#8209;Bus access to dconf. It can be abused to run arbitary commands by changing key bindings.
- `--talk-name=org.gnome.Shell.Extensions`: D&#8209;Bus access to install and manage GNOME shell extensions. It can be abused to add malicious extensions to GNOME.
If an application works natively with Wayland (*not* running through the [XWayland](https://wayland.freedesktop.org/xserver.html) compatibility layer), consider revoking its access to X11 (`--nosocket=x11`) and the [inter&#8209;process communications (IPC)](https://en.wikipedia.org/wiki/Unix_domain_socket) socket (`--unshare=ipc`) as well.
Many Flatpak apps ship with broad filesystem permissions such as `--filesystem=home` and `--filesystem=host`. Some applications implement the [Portal API](https://docs.flatpak.org/en/latest/portal-api-reference.html), which allows a file manager to pass files to the Flatpak application (e.g. VLC) without specific filesystem access privileges. Despite this, many of them [still declare `--filesystem=host`](https://github.com/flathub/org.videolan.VLC/blob/master/org.videolan.VLC.json).