From 92540f5cf1628cfaceee6c19f08b3c13b05cf6b4 Mon Sep 17 00:00:00 2001 From: lassulus Date: Wed, 28 Mar 2018 21:12:53 +0200 Subject: l xjails: init --- lass/3modules/default.nix | 1 + lass/3modules/xjail.nix | 87 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+) create mode 100644 lass/3modules/xjail.nix (limited to 'lass/3modules') diff --git a/lass/3modules/default.nix b/lass/3modules/default.nix index fd77b2262..0c10e1ec2 100644 --- a/lass/3modules/default.nix +++ b/lass/3modules/default.nix @@ -11,6 +11,7 @@ _: ./screenlock.nix ./umts.nix ./usershadow.nix + ./xjail.nix ./xserver ]; } diff --git a/lass/3modules/xjail.nix b/lass/3modules/xjail.nix new file mode 100644 index 000000000..af851760b --- /dev/null +++ b/lass/3modules/xjail.nix @@ -0,0 +1,87 @@ +{ config, pkgs, ... }: + +with import ; +{ + options.lass.xjail = mkOption { + type = types.attrsOf (types.submodule ({ config, ...}: { + options = { + user = mkOption { + type = types.string; + default = "nobody"; + }; + groups = mkOption { + type = types.listOf types.str; + default = []; + }; + name = mkOption { + type = types.string; + default = config._module.args.name; + }; + display = mkOption { + type = types.string; + default = toString (genid_signed config._module.args.name); + }; + script = mkOption { + type = types.path; + default = pkgs.writeScript "echo_lol" "echo lol"; + }; + from = mkOption { + type = types.string; + default = "lass"; + }; + }; + })); + default = {}; + }; + + options.lass.xjail-bins = mkOption { + type = types.attrsOf types.path; + }; + + # implementation + config = { + + users.users = mapAttrs' (_: cfg: + nameValuePair cfg.name { + uid = genid cfg.name; + home = "/home/${cfg.name}"; + useDefaultShell = true; + createHome = true; + extraGroups = cfg.groups; + } + ) config.lass.xjail; + + users.groups = mapAttrs' (_: cfg: + nameValuePair cfg.name { + members = [ + cfg.name + cfg.from + ]; + } + ) config.lass.xjail; + + security.sudo.extraConfig = (concatStringsSep "\n" (mapAttrsToList (_: cfg: + # TODO allow just the right script with sudo + "${cfg.from} ALL=(${cfg.name}) NOPASSWD: ALL" + ) config.lass.xjail)); + + lass.xjail-bins = mapAttrs' (name: cfg: + let + sudo-wrapper = pkgs.writeScript name '' + /var/run/wrappers/bin/sudo -u ${cfg.name} -i ${cfg.script} "$@" + ''; + in nameValuePair name (pkgs.writeScriptBin cfg.name '' + export NDISPLAY=${cfg.display} + DISPLAY=:$NDISPLAY ${pkgs.xorg.xrandr}/bin/xrandr + if test $? -eq 0; then + echo xephyr already running + export DISPLAY=:$NDISPLAY + ${sudo-wrapper} "$@" + else + echo xephyr not running + DROP_TO_USER=${cfg.name} ${pkgs.xephyrify}/bin/xephyrify ${sudo-wrapper} "$@" + fi + '') + ) config.lass.xjail; + }; +} -- cgit v1.2.3