Firejail to sandbox online games

system/app/prismlauncher.nix

@@ -0,0 +1,5 @@
+{ config, lib, pkgs, ... }:
+
+{
+  environment.systemPackages = [ pkgs.prismlauncher ];
+}

system/app/steam.nix

@@ -3,4 +3,5 @@
 {
   hardware.opengl.driSupport32Bit = true;
   programs.steam.enable = true;
+  environment.systemPackages = [ pkgs.steam ];
 }

system/security/firejail-profiles/prismlauncher.profile

@@ -0,0 +1,51 @@
+# Firejail profile for prismlauncher
+# Description: An Open Source Minecraft launcher that can manage multiple instances
+# This file is overwritten after every install/update
+# Persistent global definitions
+include globals.local
+
+ignore noexec ${HOME}
+
+noblacklist ${HOME}/.local/share/PrismLauncher
+
+include allow-java.inc
+
+include disable-common.inc
+include disable-devel.inc
+include disable-interpreters.inc
+include disable-programs.inc
+include disable-shell.inc
+include disable-xdg.inc
+
+mkdir ${HOME}/.local/share/PrismLauncher
+whitelist ${HOME}/.local/share/PrismLauncher
+include whitelist-common.inc
+include whitelist-runuser-common.inc
+include whitelist-usr-share-common.inc
+include whitelist-var-common.inc
+
+caps.drop all
+netfilter
+nodvd
+nogroups
+noinput
+nonewprivs
+noroot
+notv
+nou2f
+novideo
+protocol unix,inet,inet6,netlink
+seccomp
+tracelog
+
+disable-mnt
+private-bin java,java-config,minecraft-launcher,prismlauncher
+private-cache
+private-dev
+# If multiplayer or realms break, add 'private-etc <your-own-java-folder-from-/etc>'
+# or 'ignore private-etc' to your minecraft-launcher.local.
+private-tmp
+
+dbus-system none
+
+restrict-namespaces

system/security/firejail.nix

@@ -0,0 +1,20 @@
+{ config, lib, pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [ firejail ];
+  programs.firejail.enable = true;
+  programs.firejail.wrappedBinaries = {
+    prismlauncher = {
+      executable = "${pkgs.prismlauncher}/bin/prismlauncher";
+      profile = ./firejail-profiles/prismlauncher.profile;
+    };
+    steam = {
+      executable = "${pkgs.steam}/bin/steam";
+      profile = "${pkgs.firejail}/etc/firejail/steam.profile";
+    };
+    steam-run = {
+      executable = "${pkgs.steam}/bin/steam-run";
+      profile = "${pkgs.firejail}/etc/firejail/steam.profile";
+    };
+  };
+}