98 lines
3 KiB
Nix
98 lines
3 KiB
Nix
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.sssd;
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nscd = config.services.nscd;
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in {
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options = {
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services.sssd = {
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enable = mkEnableOption "the System Security Services Daemon.";
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config = mkOption {
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type = types.lines;
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description = "Contents of <filename>sssd.conf</filename>.";
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default = ''
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[sssd]
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config_file_version = 2
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services = nss, pam
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domains = shadowutils
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[nss]
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[pam]
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[domain/shadowutils]
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id_provider = proxy
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proxy_lib_name = files
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auth_provider = proxy
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proxy_pam_target = sssd-shadowutils
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proxy_fast_alias = True
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'';
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};
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sshAuthorizedKeysIntegration = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to make sshd look up authorized keys from SSS.
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For this to work, the <literal>ssh</literal> SSS service must be enabled in the sssd configuration.
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'';
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};
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};
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};
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config = mkMerge [
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(mkIf cfg.enable {
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assertions = singleton {
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assertion = nscd.enable;
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message = "nscd must be enabled through `services.nscd.enable` for SSSD to work.";
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};
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systemd.services.sssd = {
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description = "System Security Services Daemon";
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wantedBy = [ "multi-user.target" ];
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before = [ "systemd-user-sessions.service" "nss-user-lookup.target" ];
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after = [ "network-online.target" "nscd.service" ];
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requires = [ "network-online.target" "nscd.service" ];
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wants = [ "nss-user-lookup.target" ];
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restartTriggers = [
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config.environment.etc."nscd.conf".source
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config.environment.etc."sssd/sssd.conf".source
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];
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script = ''
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export LDB_MODULES_PATH+="''${LDB_MODULES_PATH+:}${pkgs.ldb}/modules/ldb:${pkgs.sssd}/modules/ldb"
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mkdir -p /var/lib/sss/{pubconf,db,mc,pipes,gpo_cache,secrets} /var/lib/sss/pipes/private /var/lib/sss/pubconf/krb5.include.d
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${pkgs.sssd}/bin/sssd -D
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'';
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serviceConfig = {
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Type = "forking";
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PIDFile = "/run/sssd.pid";
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};
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};
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environment.etc."sssd/sssd.conf" = {
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text = cfg.config;
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mode = "0400";
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};
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system.nssModules = optional cfg.enable pkgs.sssd;
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services.nscd.config = builtins.readFile ./nscd-sssd.conf;
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services.dbus.packages = [ pkgs.sssd ];
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})
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(mkIf cfg.sshAuthorizedKeysIntegration {
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# Ugly: sshd refuses to start if a store path is given because /nix/store is group-writable.
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# So indirect by a symlink.
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environment.etc."ssh/authorized_keys_command" = {
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mode = "0755";
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text = ''
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#!/bin/sh
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exec ${pkgs.sssd}/bin/sss_ssh_authorizedkeys "$@"
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'';
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};
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services.openssh.extraConfig = ''
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AuthorizedKeysCommand /etc/ssh/authorized_keys_command
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AuthorizedKeysCommandUser nobody
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'';
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})];
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}
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