nix: integrate dynamic users
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test / test (push) Successful in 21s
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Signed-off-by: Ophestra Umiker <cat@ophivana.moe>
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commit
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SHA256:gQ67O0enBZ7UdZypgtspB2FDM1g3GVw8nX0XSdcFw8Q
254
nixos.nix
254
nixos.nix
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@ -11,8 +11,12 @@ let
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mkOption
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mkEnableOption
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mkIf
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mkDefault
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mapAttrs
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mapAttrsToList
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mergeAttrsList
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imap1
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foldr
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foldlAttrs
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optional
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optionals
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@ -26,8 +30,24 @@ in
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environment.fortify = {
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enable = mkEnableOption "fortify";
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target = mkOption {
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default = { };
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package = mkOption {
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type = types.package;
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default = pkgs.callPackage ./package.nix { };
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description = "Package providing fortify.";
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};
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users = mkOption {
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type =
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let
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inherit (types) attrsOf ints;
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in
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attrsOf (ints.between 0 99);
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description = ''
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Users allowed to spawn fortify apps, as well as their fortify ID value.
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'';
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};
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apps = mkOption {
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type =
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let
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inherit (types)
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@ -43,8 +63,23 @@ in
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functionTo
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;
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in
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attrsOf (submodule {
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listOf (submodule {
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options = {
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name = mkOption {
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type = str;
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description = ''
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App name, typically command.
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'';
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};
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id = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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Freedesktop application ID.
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'';
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};
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packages = mkOption {
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type = listOf package;
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default = [ ];
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@ -53,15 +88,10 @@ in
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'';
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};
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launchers = mkOption {
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type = attrsOf (submodule {
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options = {
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id = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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Freedesktop application ID.
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'';
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extraConfig = mkOption {
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type = anything;
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default = { };
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description = "Extra home-manager configuration.";
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};
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script = mkOption {
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@ -82,15 +112,11 @@ in
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'';
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};
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method = mkOption {
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type = enum [
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"simple"
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"sudo"
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"systemd"
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];
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default = "systemd";
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groups = mkOption {
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type = listOf str;
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default = [ ];
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description = ''
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Launch method for the sandboxed program.
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List of groups to inherit from the privileged user.
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'';
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};
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@ -207,46 +233,8 @@ in
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};
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};
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});
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default = { };
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};
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persistence = mkOption {
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type = submodule {
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options = {
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directories = mkOption {
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type = listOf anything;
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default = [ ];
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};
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files = mkOption {
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type = listOf anything;
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default = [ ];
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};
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};
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};
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description = ''
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Per-user state passed to github:nix-community/impermanence.
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'';
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};
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extraConfig = mkOption {
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type = anything;
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default = { };
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description = "Extra home-manager configuration.";
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};
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};
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});
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};
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package = mkOption {
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type = types.package;
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default = pkgs.callPackage ./package.nix { };
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description = "Package providing fortify.";
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};
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user = mkOption {
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type = types.str;
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description = "Privileged user account.";
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description = "Applications managed by fortify.";
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};
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stateDir = mkOption {
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@ -259,25 +247,50 @@ in
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};
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config = mkIf cfg.enable {
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environment.persistence.${cfg.stateDir}.users = mapAttrs (_: target: target.persistence) cfg.target;
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security.wrappers.fsu = {
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source = "${cfg.package}/libexec/fsu";
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setuid = true;
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owner = "root";
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setgid = true;
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group = "root";
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};
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home-manager.users =
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mapAttrs (_: target: target.extraConfig // { home.packages = target.packages; }) cfg.target
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// {
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${cfg.user}.home.packages =
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environment.etc = {
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fsurc = {
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mode = "0400";
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text = foldlAttrs (
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acc: username: fid:
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"${toString config.users.users.${username}.uid} ${toString fid}\n" + acc
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) "" cfg.users;
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};
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userdb.source = pkgs.runCommand "generate-userdb" { } ''
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${cfg.package}/libexec/fuserdb -o $out ${
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foldlAttrs (
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acc: username: fid:
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acc + " ${username}:${toString fid}"
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) "-s /run/current-system/sw/bin/nologin -d ${cfg.stateDir}" cfg.users
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}
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'';
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};
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services.userdbd.enable = mkDefault true;
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home-manager =
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let
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wrap =
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user: launchers:
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mapAttrsToList (
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name: launcher:
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with launcher.capability;
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privPackages = mapAttrs (username: fid: {
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home.packages =
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let
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# aid 0 is reserved
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wrappers = imap1 (
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aid: app:
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let
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extendDBusDefault = id: ext: {
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filter = true;
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talk = [ "org.freedesktop.Notifications" ] ++ ext.talk;
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own =
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(optionals (launcher.id != null) [
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(optionals (app.id != null) [
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"${id}.*"
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"org.mpris.MediaPlayer2.${id}.*"
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])
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@ -296,37 +309,41 @@ in
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in
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{
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session_bus =
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if launcher.dbus.session != null then
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(launcher.dbus.session (extendDBusDefault launcher.id))
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if app.dbus.session != null then
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(app.dbus.session (extendDBusDefault app.id))
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else
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(extendDBusDefault launcher.id default);
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system_bus = launcher.dbus.system;
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(extendDBusDefault app.id default);
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system_bus = app.dbus.system;
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};
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command = if launcher.command == null then name else launcher.command;
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script = if launcher.script == null then ("exec " + command + " $@") else launcher.script;
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command = if app.command == null then app.name else app.command;
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script = if app.script == null then ("exec " + command + " $@") else app.script;
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enablements =
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with app.capability;
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(if wayland then 1 else 0)
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+ (if x11 then 2 else 0)
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+ (if dbus then 4 else 0)
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+ (if pulse then 8 else 0);
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conf = {
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inherit (launcher) id method;
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inherit user;
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inherit (app) id;
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command = [
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(pkgs.writeScript "${name}-start" ''
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(pkgs.writeScript "${app.name}-start" ''
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#!${pkgs.zsh}${pkgs.zsh.shellPath}
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${script}
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'')
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];
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confinement = {
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app_id = aid;
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inherit (app) groups;
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username = "u${toString fid}_a${toString aid}";
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home = "${cfg.stateDir}/${toString fid}/${toString aid}";
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sandbox = {
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inherit (launcher)
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inherit (app)
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userns
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net
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dev
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env
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;
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map_real_uid = launcher.mapRealUid;
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map_real_uid = app.mapRealUid;
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filesystem =
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[
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{ src = "/bin"; }
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@ -353,24 +370,19 @@ in
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src = "/sys/devices";
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require = false;
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}
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{
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src = "/home/${user}";
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write = true;
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require = true;
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}
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]
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++ optionals launcher.nix [
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++ optionals app.nix [
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{ src = "/nix/var"; }
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{ src = "/var/db/nix-channels"; }
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]
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++ optionals (if launcher.gpu != null then launcher.gpu else wayland || x11) [
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++ optionals (if app.gpu != null then app.gpu else app.capability.wayland || app.capability.x11) [
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{ src = "/run/opengl-driver"; }
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{
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src = "/dev/dri";
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dev = true;
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}
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]
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++ launcher.extraPaths;
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++ app.extraPaths;
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auto_etc = true;
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override = [ "/var/run/nscd" ];
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};
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@ -379,32 +391,19 @@ in
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};
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};
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in
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pkgs.writeShellScriptBin name (
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if launcher.method == "simple" then
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pkgs.writeShellScriptBin app.name ''
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exec fortify app ${pkgs.writeText "fortify-${app.name}.json" (builtins.toJSON conf)} $@
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''
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exec sudo -u ${user} -i ${command} $@
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''
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else
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''
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exec fortify app ${pkgs.writeText "fortify-${name}.json" (builtins.toJSON conf)} $@
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''
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)
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) launchers;
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) cfg.apps;
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in
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foldlAttrs (
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acc: user: target:
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acc
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++ (foldlAttrs (
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shares: name: launcher:
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foldr (
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app: acc:
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let
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pkg = if launcher.share != null then launcher.share else pkgs.${name};
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pkg = if app.share != null then app.share else pkgs.${app.name};
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copy = source: "[ -d '${source}' ] && cp -Lrv '${source}' $out/share || true";
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in
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shares
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++
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optional (launcher.method != "simple" && (launcher.capability.wayland || launcher.capability.x11))
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(
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pkgs.runCommand "${name}-share" { } ''
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optional (app.capability.wayland || app.capability.x11) (
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pkgs.runCommand "${app.name}-share" { } ''
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mkdir -p $out/share
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${copy "${pkg}/share/applications"}
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${copy "${pkg}/share/icons"}
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@ -415,22 +414,25 @@ in
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--replace-warn '${pkg}/libexec/' ""
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''
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)
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) (wrap user target.launchers) target.launchers)
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) [ cfg.package ] cfg.target;
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};
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security.polkit.extraConfig =
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let
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allowList = builtins.toJSON (mapAttrsToList (name: _: name) cfg.target);
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++ acc
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) (wrappers ++ [ cfg.package ]) cfg.apps;
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}) cfg.users;
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in
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''
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polkit.addRule(function(action, subject) {
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if (action.id == "org.freedesktop.machine1.host-shell" &&
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${allowList}.indexOf(action.lookup("user")) > -1 &&
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subject.user == "${cfg.user}") {
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return polkit.Result.YES;
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}
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});
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'';
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{
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useUserPackages = false; # prevent users.users entries from being added
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users = foldlAttrs (
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acc: _: fid:
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mergeAttrsList (
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# aid 0 is reserved
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imap1 (aid: app: {
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"u${toString fid}_a${toString aid}" = app.extraConfig // {
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home.packages = app.packages;
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};
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}) cfg.apps
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)
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// acc
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) privPackages cfg.users;
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};
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};
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}
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