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164 lines
5.4 KiB
Nix
164 lines
5.4 KiB
Nix
{ 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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dataDir = "/var/lib/sssd";
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settingsFile = "${dataDir}/sssd.conf";
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settingsFileUnsubstituted = pkgs.writeText "${dataDir}/sssd-unsubstituted.conf" cfg.config;
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in {
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options = {
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services.sssd = {
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enable = mkEnableOption (lib.mdDoc "the System Security Services Daemon");
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config = mkOption {
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type = types.lines;
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description = lib.mdDoc "Contents of {file}`sssd.conf`.";
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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 = lib.mdDoc ''
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Whether to make sshd look up authorized keys from SSS.
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For this to work, the `ssh` SSS service must be enabled in the sssd configuration.
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'';
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};
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kcm = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether to use SSS as a Kerberos Cache Manager (KCM).
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Kerberos will be configured to cache credentials in SSS.
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'';
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};
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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 = ''
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Environment file as defined in <citerefentry>
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<refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry>.
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Secrets may be passed to the service without adding them to the world-readable
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Nix store, by specifying placeholder variables as the option value in Nix and
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setting these variables accordingly in the environment file.
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<programlisting>
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# snippet of sssd-related config
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[domain/LDAP]
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ldap_default_authtok = $SSSD_LDAP_DEFAULT_AUTHTOK
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</programlisting>
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<programlisting>
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# contents of the environment file
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SSSD_LDAP_DEFAULT_AUTHTOK=verysecretpassword
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</programlisting>
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'';
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};
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};
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};
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config = mkMerge [
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(mkIf cfg.enable {
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systemd.services.sssd = {
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description = "System Security Services Daemon";
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wantedBy = [ "multi-user.target" ];
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before = [ "systemd-user-sessions.service" "nss-user-lookup.target" ];
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after = [ "network-online.target" "nscd.service" ];
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requires = [ "network-online.target" "nscd.service" ];
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wants = [ "nss-user-lookup.target" ];
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restartTriggers = [
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config.environment.etc."nscd.conf".source
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settingsFileUnsubstituted
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];
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script = ''
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export LDB_MODULES_PATH+="''${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 -c ${settingsFile}
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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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StateDirectory = baseNameOf dataDir;
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# We cannot use LoadCredential here because it's not available in ExecStartPre
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EnvironmentFile = lib.mkIf (cfg.environmentFile != null) cfg.environmentFile;
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};
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preStart = ''
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[ -f ${settingsFile} ] && rm -f ${settingsFile}
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old_umask=$(umask)
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umask 0177
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${pkgs.envsubst}/bin/envsubst \
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-o ${settingsFile} \
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-i ${settingsFileUnsubstituted}
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umask $old_umask
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'';
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};
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system.nssModules = [ pkgs.sssd ];
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system.nssDatabases = {
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group = [ "sss" ];
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passwd = [ "sss" ];
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services = [ "sss" ];
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shadow = [ "sss" ];
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};
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services.dbus.packages = [ pkgs.sssd ];
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})
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(mkIf cfg.kcm {
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systemd.services.sssd-kcm = {
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description = "SSSD Kerberos Cache Manager";
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requires = [ "sssd-kcm.socket" ];
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serviceConfig = {
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ExecStartPre = "-${pkgs.sssd}/bin/sssd --genconf-section=kcm";
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ExecStart = "${pkgs.sssd}/libexec/sssd/sssd_kcm --uid 0 --gid 0";
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};
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restartTriggers = [
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config.environment.etc."sssd/sssd.conf".source
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];
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};
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systemd.sockets.sssd-kcm = {
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description = "SSSD Kerberos Cache Manager responder socket";
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wantedBy = [ "sockets.target" ];
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# Matches the default in MIT krb5 and Heimdal:
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# https://github.com/krb5/krb5/blob/krb5-1.19.3-final/src/include/kcm.h#L43
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listenStreams = [ "/var/run/.heim_org.h5l.kcm-socket" ];
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};
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krb5.libdefaults.default_ccache_name = "KCM:";
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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.authorizedKeysCommand = "/etc/ssh/authorized_keys_command";
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services.openssh.authorizedKeysCommandUser = "nobody";
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})];
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meta.maintainers = with maintainers; [ bbigras ];
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}
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