633 lines
26 KiB
Nix
633 lines
26 KiB
Nix
{ config, lib, options, pkgs, sane-lib, utils, ... }:
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let
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saneCfg = config.sane;
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cfg = config.sane.programs;
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fs-lib = sane-lib.fs;
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path-lib = sane-lib.path;
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# create a map:
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# {
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# "${pkgName}" = {
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# system = true|false;
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# user = {
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# "${name}" = true|false;
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# };
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# };
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# }
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# for every ${pkgName} in pkgSpecs.
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# `system = true|false` is a computed expression over all the other programs, as evaluated.
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solveDefaultEnableFor = pkgSpecs: lib.foldlAttrs (
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acc: pname: pval: (
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# add "${enableName}".system |= areSuggestionsEnabled pval
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# for each `enableName` in pval.suggestedPrograms.
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# do the same for `user` field.
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lib.foldl (acc': enableName: acc' // {
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"${enableName}" = let
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super = acc'."${enableName}";
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in {
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system = super.system || (pval.enableFor.system && pval.enableSuggested);
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user = super.user // lib.filterAttrs (_u: en: en && pval.enableSuggested) pval.enableFor.user;
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};
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}) acc pval.suggestedPrograms
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)
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) (mkDefaultEnables pkgSpecs) pkgSpecs;
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mkDefaultEnables = lib.mapAttrs (_pname: _pval: { system = false; user = {}; });
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defaultEnables = solveDefaultEnableFor cfg;
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# wrap a package so that its binaries (maybe) run in a sandbox
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wrapPkg = pkgName: { fs, persist, sandbox, ... }: package: (
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if !sandbox.enable || sandbox.method == null then
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package
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else
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let
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makeProfile = pkgs.callPackage ./make-sandbox-profile.nix { };
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makeSandboxed = pkgs.callPackage ./make-sandboxed.nix { sane-sandboxed = config.sane.programs.sane-sandboxed.package; };
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# removeStorePaths: [ str ] -> [ str ], but remove store paths, because nix evals aren't allowed to contain any (for purity reasons?)
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removeStorePaths = paths: lib.filter (p: !(lib.hasPrefix "/nix/store" p)) paths;
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makeCanonical = paths: builtins.map path-lib.realpath paths;
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# derefSymlinks: [ str ] -> [ str ]: for each path which is a symlink (or a child of a symlink'd dir), dereference one layer of symlink. else, drop it from the list.
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derefSymlinks' = paths: builtins.map (fs-lib.derefSymlinkOrNull config.sane.fs) paths;
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derefSymlinks = paths: lib.filter (p: p != null) (derefSymlinks' paths);
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# expandSymlinksOnce: [ str ] -> [ str ], returning all the original paths plus dereferencing any symlinks and adding their targets to this list.
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expandSymlinksOnce = paths: lib.unique (paths ++ removeStorePaths (makeCanonical (derefSymlinks paths)));
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expandSymlinks = paths: lib.converge expandSymlinksOnce paths;
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vpn = lib.findSingle (v: v.default) null null (builtins.attrValues config.sane.vpn);
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sandboxProfilesFor = userName: let
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homeDir = config.sane.users."${userName}".home;
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uid = config.users.users."${userName}".uid;
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xdgRuntimeDir = "/run/user/${builtins.toString uid}";
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fullHomePaths = lib.optionals (userName != null) (
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builtins.map
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(p: path-lib.concat [ homeDir p ])
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(builtins.attrNames fs ++ builtins.attrNames persist.byPath ++ sandbox.extraHomePaths)
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);
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fullRuntimePaths = lib.optionals (userName != null) (
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builtins.map
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(p: path-lib.concat [ xdgRuntimeDir p ])
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sandbox.extraRuntimePaths
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);
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allowedPaths = [
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"/nix/store"
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"/bin/sh"
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"/etc" #< especially for /etc/profiles/per-user/$USER/bin
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"/run/current-system" #< for basics like `ls`, and all this program's `suggestedPrograms` (/run/current-system/sw/bin)
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"/run/wrappers" #< SUID wrappers, in this case so that firejail can be re-entrant. TODO: remove!
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"/run/systemd/resolve" #< to allow reading /etc/resolv.conf, which ultimately symlinks here
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# /run/opengl-driver is a symlink into /nix/store; needed by e.g. mpv
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"/run/opengl-driver"
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"/run/opengl-driver-32" #< XXX: doesn't exist on aarch64?
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"/usr/bin/env"
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] ++ lib.optionals (builtins.elem "system" sandbox.whitelistDbus) [ "/run/dbus/system_bus_socket" ]
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++ sandbox.extraPaths ++ fullHomePaths ++ fullRuntimePaths;
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in makeProfile {
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inherit pkgName;
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inherit (sandbox)
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autodetectCliPaths
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capabilities
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extraConfig
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method
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whitelistPwd
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;
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netDev = if sandbox.net == "vpn" then
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vpn.bridgeDevice
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else
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sandbox.net;
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dns = if sandbox.net == "vpn" then
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vpn.dns
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else
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null;
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allowedPaths = expandSymlinks allowedPaths;
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};
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defaultProfile = sandboxProfilesFor config.sane.defaultUser;
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makeSandboxedArgs = {
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inherit pkgName package;
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inherit (sandbox)
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embedSandboxer
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wrapperType
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;
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};
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in
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makeSandboxed (makeSandboxedArgs // {
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passthru = {
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inherit sandboxProfilesFor;
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withEmbeddedSandboxer = makeSandboxed (makeSandboxedArgs // {
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# embed the sandboxer AND a profile, whichever profile the package would have if installed by the default user.
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# useful to iterate a package's sandbox config without redeploying.
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embedSandboxer = true;
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extraSandboxerArgs = [
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"--sane-sandbox-profile-dir" "${defaultProfile}/share/sane-sandboxed/profiles"
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];
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});
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withEmbeddedSandboxerOnly = makeSandboxed (makeSandboxedArgs // {
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# embed the sandboxer but no profile. useful pretty much only for testing changes within the actual sandboxer.
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embedSandboxer = true;
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});
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};
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})
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);
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pkgSpec = with lib; types.submodule ({ config, name, ... }: {
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options = {
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packageUnwrapped = mkOption {
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type = types.nullOr types.package;
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description = ''
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package, or `null` if the program is some sort of meta set (in which case it much EXPLICITLY be set null).
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'';
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default =
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let
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pkgPath = lib.splitString "." name;
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in
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# package can be inferred by the attr name, allowing shorthand like
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# `sane.programs.nano.enable = true;`
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# this indexing will throw if the package doesn't exist and the user forgets to specify
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# a valid source explicitly.
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lib.getAttrFromPath pkgPath pkgs;
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};
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package = mkOption {
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type = types.nullOr types.package;
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description = ''
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assigned internally.
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this is `packageUnwrapped`, but with the binaries possibly wrapped in sandboxing measures.
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'';
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};
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enableFor.system = mkOption {
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type = types.bool;
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default = defaultEnables."${name}".system;
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description = ''
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place this program on the system PATH
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'';
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};
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enableFor.user = mkOption {
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type = types.attrsOf types.bool;
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default = defaultEnables."${name}".user;
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description = ''
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place this program on the PATH for some specified user(s).
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'';
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};
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enabled = mkOption {
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type = types.bool;
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description = ''
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generated (i.e. read-only) value indicating if the program is enabled either for any user or for the system.
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'';
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};
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suggestedPrograms = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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list of other programs a user may want to enable alongside this one.
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for example, the gnome desktop environment would suggest things like its settings app.
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'';
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};
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enableSuggested = mkOption {
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type = types.bool;
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default = true;
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};
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mime.priority = mkOption {
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type = types.int;
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default = 100;
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description = ''
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program with the numerically lower priority takes precedence whenever two mime associations overlap.
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'';
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};
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mime.associations = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = ''
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mime associations. each entry takes the form of:
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"<mime type>" = "<launcher>.desktop"
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e.g.
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{
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"audio/flac" = "vlc.desktop";
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"application/pdf" = "org.gnome.Evince.desktop";
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}
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'';
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};
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mime.urlAssociations = mkOption {
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# TODO: it'd be cool to have the value part of this be `.desktop` files.
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# mimeo doesn't quite do that well. would need a wrapper script which does `mimeo --desk2field Exec mpv.desktop` to get the command
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# and then interpolate the paths into it (%U)
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type = types.attrsOf types.str;
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default = {};
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description = ''
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map of regex -> command.
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e.g. "^https?://(www.)?youtube.com/watch\?.*v=" = "mpv %U"
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'';
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};
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persist = mkOption {
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type = options.sane.persist.sys.type;
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default = {};
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description = ''
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entries to pass onto `sane.persist.sys` or `sane.user.persist`
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when this program is enabled.
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'';
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};
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fs = mkOption {
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# funny type to allow deferring the option merging down to the layer below
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type = types.attrsOf (types.coercedTo types.attrs (a: [ a ]) (types.listOf types.attrs));
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default = {};
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description = "files to populate when this program is enabled";
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};
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secrets = mkOption {
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type = types.attrsOf types.path;
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default = {};
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description = ''
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fs paths to link to some decrypted secret.
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the secret will have same owner as the user under which the program is enabled.
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'';
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};
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env = mkOption {
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type = types.attrsOf types.str;
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default = {};
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description = ''
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environment variables to set when this program is enabled.
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env vars set here are intended to propagate everywhere into the user's (or system's) session/services;
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they aren't visible just to the program which specified them.
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'';
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};
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services = mkOption {
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type = types.attrsOf types.anything; # options.sane.users.value.type;
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default = {};
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description = ''
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user services to define if this package is enabled.
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acts as noop for root-enabled packages.
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see `sane.users.<user>.services` for options;
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'';
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};
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buildCost = mkOption {
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type = types.enum [ 0 1 2 ];
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default = 0;
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description = ''
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whether this package is very slow, or has unique dependencies which are very slow to build.
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marking packages like this can be used to achieve faster, but limited, rebuilds/deploys (by omitting the package).
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'';
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};
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sandbox.net = mkOption {
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type = types.coercedTo
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types.str
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(s: if s == "clearnet" || s == "localhost" then "all" else s)
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(types.enum [ null "all" "vpn" ]);
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default = null;
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description = ''
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how this app should have its network traffic routed.
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- "all": unsandboxed network.
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- "clearnet": traffic is routed only over clearnet.
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currently, just an alias for "all".
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- "localhost": only needs access to other services running on this host.
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currently, just an alias for "all".
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- "vpn": to route all traffic over the default VPN.
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- null: to maximally isolate from the network.
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'';
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};
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sandbox.method = mkOption {
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type = types.nullOr (types.enum [ "bwrap" "capshonly" "firejail" "landlock" ]);
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default = null; #< TODO: default to something non-null
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description = ''
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how/whether to sandbox all binaries in the package.
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'';
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};
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sandbox.enable = mkOption {
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type = types.bool;
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default = true;
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};
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sandbox.embedSandboxer = mkOption {
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type = types.bool;
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default = false;
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description = ''
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whether the sandboxed application should reference its sandboxer by path or by name.
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'';
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};
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sandbox.wrapperType = mkOption {
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type = types.enum [ "inplace" "wrappedDerivation" ];
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default = "wrappedDerivation";
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description = ''
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how to manipulate the `packageUnwrapped` derivation in order to achieve sandboxing.
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- inplace: applies an override to `packageUnwrapped`, so that all `bin/` files are sandboxed,
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and call into un-sandboxed dot-files within `bin/` (like makeWrapper does).
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- wrappedDerivation: leaves the input derivation unchanged, and creates a _new_ derivation whose
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binaries wrap the binaries in the original derivation with a sandbox.
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"inplace" is more reliable, but "wrappedDerivation" is more lightweight (doesn't force any rebuilds).
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the biggest gap in "wrappedDerivation" is that it doesn't link anything outside `bin/`, except for
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some limited (verified safe) support for `share/applications/*.desktop`
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'';
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};
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sandbox.autodetectCliPaths = mkOption {
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type = types.coercedTo types.bool
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(b: if b then "existing" else null)
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(types.nullOr (types.enum [ "existing" "existingFile" "existingFileOrParent" "existingOrParent" "parent" ]));
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default = null;
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description = ''
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if a CLI argument looks like a PATH, should we add it to the sandbox?
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- null => never
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- "existing" => only if the path exists.
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- "existingFile" => only if the path exists *and is file-like* (i.e. a file or a symlink to a file, but not a directory)
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- "parent" => allow access to the directory containing any file (whether that file exists or not). useful for certain media viewers/library managers.
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- "existingOrParent" => add the path if it exists; if not, add its parent if that exists. useful for programs which create files or directories.
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- "existingFileOrParent" => add the path if it exists and is file-like; if not, add its parent if that exists. useful for programs which create files.
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'';
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};
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sandbox.capabilities = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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list of Linux capabilities the program needs. lowercase, and without the cap_ prefix.
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e.g. sandbox.capabilities = [ "net_admin" "net_raw" ];
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'';
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};
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sandbox.whitelistAudio = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow sandbox to freely interact with pulse/pipewire.
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'';
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};
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sandbox.whitelistDbus = mkOption {
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type = types.listOf (types.enum [ "user" "system" ]);
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default = [ ];
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description = ''
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allow sandbox to freely interact with dbus services.
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'';
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};
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sandbox.whitelistDri = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow sandbox to access the kernel's /dev/dri interface(s).
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this enables GPU acceleration, particularly for mesa applications,
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however, this basically amounts to letting the sandbox send GPU-specific
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commands directly to the GPU (or, its kernel module), which is a rather
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broad and unaudited attack surface.
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'';
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};
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sandbox.whitelistPwd = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow the program full access to whichever directory it was launched from.
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'';
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};
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sandbox.whitelistS6 = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow the program to start/stop s6 services.
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'';
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};
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sandbox.whitelistWayland = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow sandbox to communicate with the wayland server.
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note that this does NOT permit access to compositor admin tooling like `swaymsg`.
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'';
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};
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sandbox.whitelistX = mkOption {
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type = types.bool;
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default = false;
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description = ''
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allow the sandbox to communicate with the X server.
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typically, this is actually the Xwayland server and you should also enable `whitelistWayland`.
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'';
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};
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sandbox.extraPaths = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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additional absolute paths to bind into the sandbox.
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'';
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};
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sandbox.extraHomePaths = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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additional home-relative paths to bind into the sandbox.
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'';
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};
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sandbox.extraRuntimePaths = mkOption {
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type = types.listOf types.str;
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default = [ ];
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description = ''
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additional $XDG_RUNTIME_DIR-relative paths to bind into the sandbox.
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e.g. `[ "bus" "wayland-1" ]` to bind the dbus and wayland sockets.
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or `[ "/" ]` to bind all of XDG_RUNTIME_DIR.
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'';
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};
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sandbox.extraConfig = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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extra arguments to pass to the sandbox wrapper.
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example: [
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"--sane-sandbox-firejail-arg"
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"--whitelist=''${HOME}/.ssh"
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"--sane-sandbox-firejail-arg"
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"--keep-dev-shm"
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]
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'';
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};
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sandbox.usePortal = mkOption {
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type = types.bool;
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default = true;
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description = ''
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instruct the sandboxed program to open external applications
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via calls to xdg-desktop-portal.
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'';
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};
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configOption = mkOption {
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type = types.raw;
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default = mkOption {
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type = types.submodule {};
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default = {};
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};
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description = ''
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declare any other options the program may be configured with.
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you probably want this to be a submodule.
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the option *definitions* can be set with `sane.programs."foo".config = ...`.
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'';
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};
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config = config.configOption;
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};
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config = let
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enabledForUser = builtins.any (en: en) (lib.attrValues config.enableFor.user);
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passesSlowTest = config.buildCost <= saneCfg.maxBuildCost;
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in {
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enabled = (config.enableFor.system || enabledForUser) && passesSlowTest;
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package = if config.packageUnwrapped == null then
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null
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else
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wrapPkg name config config.packageUnwrapped
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;
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suggestedPrograms = lib.optionals (config.sandbox.method == "bwrap") [ "bubblewrap" ]
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++ lib.optionals (config.sandbox.method == "firejail") [ "firejail" ];
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# declare a fs dependency for each secret, but don't specify how to populate it yet.
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# can't populate it here because it varies per-user.
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# this gets the symlink into the sandbox, but not the actual secret.
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fs = lib.mapAttrs (_homePath: _secretSrc: {}) config.secrets;
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sandbox.extraPaths =
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lib.optionals config.sandbox.whitelistDri [
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# /dev/dri/renderD128: requested by wayland-egl (e.g. KOreader, animatch, geary)
|
|
# - but everything seems to gracefully fallback to *something* (MESA software rendering?)
|
|
# - CPU usage difference between playing videos in Gtk apps (e.g. fractal) with v.s. without DRI is 10% v.s. 90%.
|
|
# - GPU attack surface is *large*: <https://security.stackexchange.com/questions/182501/modern-linux-gpu-driver-security>
|
|
"/dev/dri" "/sys/dev/char" "/sys/devices" # (lappy: "/sys/devices/pci0000:00", moby needs something different)
|
|
]
|
|
++ lib.optionals config.sandbox.whitelistX [ "/tmp/.X11-unix" ]
|
|
;
|
|
sandbox.extraRuntimePaths =
|
|
lib.optionals config.sandbox.whitelistAudio [ "pipewire" "pulse" ] # this includes pipewire/pipewire-0-manager: is that ok?
|
|
++ lib.optionals (builtins.elem "user" config.sandbox.whitelistDbus) [ "bus" ]
|
|
++ lib.optionals config.sandbox.whitelistWayland [ "wayland" ] # app can still communicate with wayland server w/o this, if it has net access
|
|
++ lib.optionals config.sandbox.whitelistS6 [ "s6" ] # TODO: this allows re-writing the services themselves: don't allow that!
|
|
;
|
|
sandbox.extraConfig = lib.mkIf config.sandbox.usePortal [
|
|
"--sane-sandbox-portal"
|
|
];
|
|
};
|
|
});
|
|
toPkgSpec = with lib; types.coercedTo types.package (p: { package = p; }) pkgSpec;
|
|
|
|
configs = lib.mapAttrsToList (name: p: {
|
|
assertions = [
|
|
{
|
|
assertion = !(p.sandbox.enable && p.sandbox.method == null) || !p.enabled || p.package == null || config.sane.strictSandboxing != "assert";
|
|
message = "program ${name} specified no `sandbox.method`; please configure a method, or set sandbox.enable = false.";
|
|
}
|
|
{
|
|
assertion = p.sandbox.net == "all" || p.sandbox.method != null || !p.enabled || p.package == null || config.sane.strictSandboxing != "assert";
|
|
message = ''program "${name}" requests net "${builtins.toString p.sandbox.net}", which requires sandboxing, but sandboxing wasn't configured'';
|
|
}
|
|
] ++ builtins.map (sug: {
|
|
assertion = cfg ? "${sug}";
|
|
message = ''program "${sug}" referenced by "${name}", but not defined'';
|
|
}) p.suggestedPrograms;
|
|
|
|
warnings = lib.mkIf (config.sane.strictSandboxing == "warn" && p.sandbox.enable && p.sandbox.method == null && p.enabled && p.package != null) [
|
|
"program ${name} specified no `sandbox.method`; please configure a method, or set sandbox.enable = false."
|
|
];
|
|
|
|
system.checks = lib.optionals (p.enabled && p.sandbox.enable && p.sandbox.method != null && p.package != null) [
|
|
p.package.passthru.checkSandboxed
|
|
];
|
|
|
|
# conditionally add to system PATH and env
|
|
environment = lib.optionalAttrs (p.enabled && p.enableFor.system) {
|
|
systemPackages = lib.optionals (p.package != null) (
|
|
[ p.package ] ++ lib.optional (p.sandbox.enable && p.sandbox.method != null) (p.package.passthru.sandboxProfilesFor null)
|
|
);
|
|
# sessionVariables are set by PAM, as opposed to environment.variables which goes in /etc/profile
|
|
sessionVariables = p.env;
|
|
};
|
|
|
|
# conditionally add to user(s) PATH
|
|
users.users = lib.mapAttrs (userName: en: {
|
|
packages = lib.optionals (p.package != null && en && p.enabled) (
|
|
[ p.package ] ++ lib.optional (p.sandbox.enable && p.sandbox.method != null) (p.package.passthru.sandboxProfilesFor userName)
|
|
);
|
|
}) p.enableFor.user;
|
|
|
|
# conditionally persist relevant user dirs and create files
|
|
sane.users = lib.mapAttrs (user: en: lib.optionalAttrs (en && p.enabled) {
|
|
inherit (p) persist services;
|
|
environment = p.env;
|
|
fs = lib.mkMerge [
|
|
p.fs
|
|
# link every secret into the fs:
|
|
|
|
(lib.mapAttrs
|
|
# TODO: user the user's *actual* home directory, don't guess.
|
|
(homePath: _src: sane-lib.fs.wantedSymlinkTo "/run/secrets/home/${user}/${homePath}")
|
|
p.secrets
|
|
)
|
|
# alternative double indirection which may be slightly friendlier to sandboxing:
|
|
# ~/.config/FOO.secret => ~/.config/secrets/.config/FOO.secret => /run/secrets/home/${user}/.config/FOO.secret
|
|
# whereas /run/secrets/* is unreadable *except* for the leafs, ~/.config/secrets is readable and traversable by $USER.
|
|
# (lib.mapAttrs
|
|
# # TODO: user the user's *actual* home directory, don't guess.
|
|
# (homePath: _src: sane-lib.fs.wantedSymlinkTo "/home/${user}/.config/secrets/${homePath}")
|
|
# p.secrets
|
|
# )
|
|
# (lib.mapAttrs'
|
|
# (homePath: _src: {
|
|
# name = ".config/secrets/${homePath}";
|
|
# value = sane-lib.fs.wantedSymlinkTo "/run/secrets/home/${user}/${homePath}";
|
|
# })
|
|
# p.secrets
|
|
# )
|
|
];
|
|
}) p.enableFor.user;
|
|
|
|
# make secrets available for each user
|
|
sops.secrets = lib.concatMapAttrs
|
|
(user: en: lib.optionalAttrs (en && p.enabled) (
|
|
lib.mapAttrs'
|
|
(homePath: src: {
|
|
# TODO: use the user's *actual* home directory, don't guess.
|
|
# XXX: name CAN'T START WITH '/', else sops creates the directories funny.
|
|
# TODO: report this upstream.
|
|
name = "home/${user}/${homePath}";
|
|
value = {
|
|
owner = user;
|
|
sopsFile = src;
|
|
format = "binary";
|
|
};
|
|
})
|
|
p.secrets
|
|
))
|
|
p.enableFor.user;
|
|
|
|
}) cfg;
|
|
in
|
|
{
|
|
options = with lib; {
|
|
# TODO: consolidate these options under one umbrella attrset
|
|
sane.programs = mkOption {
|
|
type = types.attrsOf toPkgSpec;
|
|
default = {};
|
|
};
|
|
sane.maxBuildCost = mkOption {
|
|
type = types.enum [ 0 1 2 ];
|
|
default = 2;
|
|
description = ''
|
|
max build cost of programs to ship.
|
|
set to 0 to get the fastest, but most restrictive build.
|
|
'';
|
|
};
|
|
sane.strictSandboxing = mkOption {
|
|
type = types.enum [ false "warn" "assert" ];
|
|
default = "warn";
|
|
description = ''
|
|
whether to require that every `sane.program` explicitly specify its sandbox settings.
|
|
'';
|
|
};
|
|
};
|
|
|
|
config =
|
|
let
|
|
take = f: {
|
|
assertions = f.assertions;
|
|
environment.systemPackages = f.environment.systemPackages;
|
|
environment.sessionVariables = f.environment.sessionVariables;
|
|
users.users = f.users.users;
|
|
sane.users = f.sane.users;
|
|
sops.secrets = f.sops.secrets;
|
|
system.checks = f.system.checks;
|
|
warnings = f.warnings;
|
|
};
|
|
in lib.mkMerge [
|
|
(take (sane-lib.mkTypedMerge take configs))
|
|
{
|
|
environment.pathsToLink = [ "/share/sane-sandboxed" ];
|
|
sane.programs.sane-sandboxed.enableFor.system = true;
|
|
# expose the pkgs -- as available to the system -- as a build target.
|
|
system.build.pkgs = pkgs;
|
|
}
|
|
];
|
|
}
|