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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.dex;
fixClient = client: if client ? secretFile then ((builtins.removeAttrs client [ "secretFile" ]) // { secret = client.secretFile; }) else client;
filteredSettings = mapAttrs (n: v: if n == "staticClients" then (builtins.map fixClient v) else v) cfg.settings;
secretFiles = flatten (builtins.map (c: if c ? secretFile then [ c.secretFile ] else []) (cfg.settings.staticClients or []));
settingsFormat = pkgs.formats.yaml {};
configFile = settingsFormat.generate "config.yaml" filteredSettings;
startPreScript = pkgs.writeShellScript "dex-start-pre" (''
'' + (concatStringsSep "\n" (builtins.map (file: ''
${pkgs.replace-secret}/bin/replace-secret '${file}' '${file}' /run/dex/config.yaml
'') secretFiles)));
in
{
options.services.dex = {
enable = mkEnableOption "the OpenID Connect and OAuth2 identity provider";
settings = mkOption {
type = settingsFormat.type;
default = {};
example = literalExpression ''
{
# External url
issuer = "http://127.0.0.1:5556/dex";
storage = {
type = "postgres";
config.host = "/var/run/postgres";
};
web = {
http = "127.0.0.1:5556";
};
enablePasswordDB = true;
staticClients = [
{
id = "oidcclient";
name = "Client";
redirectURIs = [ "https://example.com/callback" ];
secretFile = "/etc/dex/oidcclient"; # The content of `secretFile` will be written into to the config as `secret`.
}
];
}
'';
description = ''
The available options can be found in
<link xlink:href="https://github.com/dexidp/dex/blob/v${pkgs.dex.version}/config.yaml.dist">the example configuration</link>.
'';
};
};
config = mkIf cfg.enable {
systemd.services.dex = {
description = "dex identity provider";
wantedBy = [ "multi-user.target" ];
after = [ "networking.target" ] ++ (optional (cfg.settings.storage.type == "postgres") "postgresql.service");
serviceConfig = {
ExecStart = "${pkgs.dex-oidc}/bin/dex serve /run/dex/config.yaml";
ExecStartPre = [
"${pkgs.coreutils}/bin/install -m 600 ${configFile} /run/dex/config.yaml"
"+${startPreScript}"
];
RuntimeDirectory = "dex";
AmbientCapabilities = "CAP_NET_BIND_SERVICE";
BindReadOnlyPaths = [
"/nix/store"
"-/etc/resolv.conf"
"-/etc/nsswitch.conf"
"-/etc/hosts"
"-/etc/localtime"
"-/etc/dex"
];
BindPaths = optional (cfg.settings.storage.type == "postgres") "/var/run/postgresql";
CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
# ProtectClock= adds DeviceAllow=char-rtc r
DeviceAllow = "";
DynamicUser = true;
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateDevices = true;
PrivateMounts = true;
# Port needs to be exposed to the host network
#PrivateNetwork = true;
PrivateTmp = true;
PrivateUsers = true;
ProcSubset = "pid";
ProtectClock = true;
ProtectHome = true;
ProtectHostname = true;
# Would re-mount paths ignored by temporary root
#ProtectSystem = "strict";
ProtectControlGroups = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" "AF_UNIX" ];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = [ "@system-service" "~@privileged @resources @setuid @keyring" ];
TemporaryFileSystem = "/:ro";
# Does not work well with the temporary root
#UMask = "0066";
};
};
};
# uses attributes of the linked package
meta.buildDocsInSandbox = false;
}
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