132 lines
4.6 KiB
Nix
132 lines
4.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dex;
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fixClient = client: if client ? secretFile then ((builtins.removeAttrs client [ "secretFile" ]) // { secret = client.secretFile; }) else client;
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filteredSettings = mapAttrs (n: v: if n == "staticClients" then (builtins.map fixClient v) else v) cfg.settings;
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secretFiles = flatten (builtins.map (c: optional (c ? secretFile) c.secretFile) (cfg.settings.staticClients or []));
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settingsFormat = pkgs.formats.yaml {};
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configFile = settingsFormat.generate "config.yaml" filteredSettings;
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startPreScript = pkgs.writeShellScript "dex-start-pre"
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(concatStringsSep "\n" (map (file: ''
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replace-secret '${file}' '${file}' /run/dex/config.yaml
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'')
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secretFiles));
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in
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{
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options.services.dex = {
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enable = mkEnableOption (lib.mdDoc "the OpenID Connect and OAuth2 identity provider");
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environmentFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = lib.mdDoc ''
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Environment file (see `systemd.exec(5)`
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"EnvironmentFile=" section for the syntax) to define variables for dex.
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This option can be used to safely include secret keys into the dex configuration.
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'';
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};
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settings = mkOption {
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type = settingsFormat.type;
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default = {};
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example = literalExpression ''
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{
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# External url
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issuer = "http://127.0.0.1:5556/dex";
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storage = {
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type = "postgres";
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config.host = "/var/run/postgres";
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};
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web = {
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http = "127.0.0.1:5556";
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};
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enablePasswordDB = true;
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staticClients = [
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{
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id = "oidcclient";
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name = "Client";
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redirectURIs = [ "https://example.com/callback" ];
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secretFile = "/etc/dex/oidcclient"; # The content of `secretFile` will be written into to the config as `secret`.
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}
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];
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}
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'';
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description = lib.mdDoc ''
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The available options can be found in
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[the example configuration](https://github.com/dexidp/dex/blob/v${pkgs.dex-oidc.version}/config.yaml.dist).
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It's also possible to refer to environment variables (defined in [services.dex.environmentFile](#opt-services.dex.environmentFile))
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using the syntax `$VARIABLE_NAME`.
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.services.dex = {
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description = "dex identity provider";
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wantedBy = [ "multi-user.target" ];
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after = [ "networking.target" ] ++ (optional (cfg.settings.storage.type == "postgres") "postgresql.service");
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path = with pkgs; [ replace-secret ];
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serviceConfig = {
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ExecStart = "${pkgs.dex-oidc}/bin/dex serve /run/dex/config.yaml";
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ExecStartPre = [
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"${pkgs.coreutils}/bin/install -m 600 ${configFile} /run/dex/config.yaml"
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"+${startPreScript}"
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];
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RuntimeDirectory = "dex";
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AmbientCapabilities = "CAP_NET_BIND_SERVICE";
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BindReadOnlyPaths = [
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"/nix/store"
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"-/etc/dex"
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"-/etc/hosts"
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"-/etc/localtime"
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"-/etc/nsswitch.conf"
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"-/etc/resolv.conf"
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"-/etc/ssl/certs/ca-certificates.crt"
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];
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BindPaths = optional (cfg.settings.storage.type == "postgres") "/var/run/postgresql";
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CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
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# ProtectClock= adds DeviceAllow=char-rtc r
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DeviceAllow = "";
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DynamicUser = true;
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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# Port needs to be exposed to the host network
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#PrivateNetwork = true;
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PrivateTmp = true;
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PrivateUsers = true;
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ProcSubset = "pid";
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ProtectClock = true;
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ProtectHome = true;
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ProtectHostname = true;
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ProtectSystem = "strict";
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ProtectControlGroups = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SystemCallArchitectures = "native";
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SystemCallFilter = [ "@system-service" "~@privileged @setuid @keyring" ];
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UMask = "0066";
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} // optionalAttrs (cfg.environmentFile != null) {
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EnvironmentFile = cfg.environmentFile;
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};
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};
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};
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# uses attributes of the linked package
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meta.buildDocsInSandbox = false;
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}
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