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310 lines
10 KiB
Nix
310 lines
10 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) mkEnableOption mkIf mkMerge mkOption mkRenamedOptionModule types;
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cfg = config.users.ldap;
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# Careful: OpenLDAP seems to be very picky about the indentation of
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# this file. Directives HAVE to start in the first column!
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ldapConfig = {
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target = "ldap.conf";
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source = pkgs.writeText "ldap.conf" ''
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uri ${config.users.ldap.server}
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base ${config.users.ldap.base}
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timelimit ${toString config.users.ldap.timeLimit}
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bind_timelimit ${toString config.users.ldap.bind.timeLimit}
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bind_policy ${config.users.ldap.bind.policy}
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${lib.optionalString config.users.ldap.useTLS ''
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ssl start_tls
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''}
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${lib.optionalString (config.users.ldap.bind.distinguishedName != "") ''
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binddn ${config.users.ldap.bind.distinguishedName}
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''}
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${lib.optionalString (cfg.extraConfig != "") cfg.extraConfig }
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'';
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};
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nslcdConfig = pkgs.writeText "nslcd.conf" ''
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uri ${cfg.server}
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base ${cfg.base}
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timelimit ${toString cfg.timeLimit}
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bind_timelimit ${toString cfg.bind.timeLimit}
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${lib.optionalString (cfg.bind.distinguishedName != "")
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"binddn ${cfg.bind.distinguishedName}" }
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${lib.optionalString (cfg.daemon.rootpwmoddn != "")
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"rootpwmoddn ${cfg.daemon.rootpwmoddn}" }
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${lib.optionalString (cfg.daemon.extraConfig != "") cfg.daemon.extraConfig }
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'';
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# nslcd normally reads configuration from /etc/nslcd.conf.
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# this file might contain secrets. We append those at runtime,
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# so redirect its location to something more temporary.
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nslcdWrapped = pkgs.runCommand "nslcd-wrapped" { nativeBuildInputs = [ pkgs.makeWrapper ]; } ''
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mkdir -p $out/bin
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makeWrapper ${pkgs.nss_pam_ldapd}/sbin/nslcd $out/bin/nslcd \
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--set LD_PRELOAD "${pkgs.libredirect}/lib/libredirect.so" \
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--set NIX_REDIRECTS "/etc/nslcd.conf=/run/nslcd/nslcd.conf"
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'';
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in
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{
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###### interface
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options = {
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users.ldap = {
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enable = mkEnableOption "authentication against an LDAP server";
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loginPam = mkOption {
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type = types.bool;
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default = true;
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description = "Whether to include authentication against LDAP in login PAM.";
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};
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nsswitch = mkOption {
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type = types.bool;
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default = true;
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description = "Whether to include lookup against LDAP in NSS.";
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};
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server = mkOption {
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type = types.str;
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example = "ldap://ldap.example.org/";
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description = "The URL of the LDAP server.";
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};
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base = mkOption {
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type = types.str;
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example = "dc=example,dc=org";
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description = "The distinguished name of the search base.";
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};
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useTLS = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, use TLS (encryption) over an LDAP (port 389)
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connection. The alternative is to specify an LDAPS server (port
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636) in {option}`users.ldap.server` or to forego
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security.
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'';
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};
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timeLimit = mkOption {
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default = 0;
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type = types.int;
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description = ''
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Specifies the time limit (in seconds) to use when performing
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searches. A value of zero (0), which is the default, is to
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wait indefinitely for searches to be completed.
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'';
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};
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daemon = {
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enable = 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 let the nslcd daemon (nss-pam-ldapd) handle the
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LDAP lookups for NSS and PAM. This can improve performance,
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and if you need to bind to the LDAP server with a password,
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it increases security, since only the nslcd user needs to
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have access to the bindpw file, not everyone that uses NSS
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and/or PAM. If this option is enabled, a local nscd user is
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created automatically, and the nslcd service is started
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automatically when the network get up.
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'';
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};
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extraConfig = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Extra configuration options that will be added verbatim at
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the end of the nslcd configuration file (`nslcd.conf(5)`).
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'';
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} ;
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rootpwmoddn = mkOption {
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default = "";
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example = "cn=admin,dc=example,dc=com";
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type = types.str;
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description = ''
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The distinguished name to use to bind to the LDAP server
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when the root user tries to modify a user's password.
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'';
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};
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rootpwmodpwFile = mkOption {
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default = "";
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example = "/run/keys/nslcd.rootpwmodpw";
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type = types.str;
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description = ''
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The path to a file containing the credentials with which to bind to
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the LDAP server if the root user tries to change a user's password.
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'';
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};
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};
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bind = {
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distinguishedName = mkOption {
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default = "";
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example = "cn=admin,dc=example,dc=com";
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type = types.str;
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description = ''
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The distinguished name to bind to the LDAP server with. If this
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is not specified, an anonymous bind will be done.
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'';
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};
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passwordFile = mkOption {
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default = "/etc/ldap/bind.password";
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type = types.str;
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description = ''
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The path to a file containing the credentials to use when binding
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to the LDAP server (if not binding anonymously).
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'';
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};
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timeLimit = mkOption {
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default = 30;
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type = types.int;
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description = ''
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Specifies the time limit (in seconds) to use when connecting
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to the directory server. This is distinct from the time limit
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specified in {option}`users.ldap.timeLimit` and affects
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the initial server connection only.
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'';
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};
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policy = mkOption {
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default = "hard_open";
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type = types.enum [ "hard_open" "hard_init" "soft" ];
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description = ''
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Specifies the policy to use for reconnecting to an unavailable
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LDAP server. The default is `hard_open`, which
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reconnects if opening the connection to the directory server
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failed. By contrast, `hard_init` reconnects if
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initializing the connection failed. Initializing may not
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actually contact the directory server, and it is possible that
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a malformed configuration file will trigger reconnection. If
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`soft` is specified, then
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`nss_ldap` will return immediately on server
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failure. All hard reconnect policies block with exponential
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backoff before retrying.
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'';
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};
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};
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extraConfig = mkOption {
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default = "";
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type = types.lines;
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description = ''
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Extra configuration options that will be added verbatim at
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the end of the ldap configuration file (`ldap.conf(5)`).
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If {option}`users.ldap.daemon` is enabled, this
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configuration will not be used. In that case, use
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{option}`users.ldap.daemon.extraConfig` instead.
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'';
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.etc = lib.optionalAttrs (!cfg.daemon.enable) {
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"ldap.conf" = ldapConfig;
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};
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system.nssModules = mkIf cfg.nsswitch (lib.singleton (
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if cfg.daemon.enable then pkgs.nss_pam_ldapd else pkgs.nss_ldap
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));
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system.nssDatabases.group = lib.optional cfg.nsswitch "ldap";
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system.nssDatabases.passwd = lib.optional cfg.nsswitch "ldap";
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system.nssDatabases.shadow = lib.optional cfg.nsswitch "ldap";
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users = mkIf cfg.daemon.enable {
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groups.nslcd = {
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gid = config.ids.gids.nslcd;
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};
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users.nslcd = {
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uid = config.ids.uids.nslcd;
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description = "nslcd user.";
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group = "nslcd";
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};
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};
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systemd.services = mkMerge [
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(mkIf (!cfg.daemon.enable) {
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ldap-password = {
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wantedBy = [ "sysinit.target" ];
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before = [ "sysinit.target" "shutdown.target" ];
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conflicts = [ "shutdown.target" ];
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unitConfig.DefaultDependencies = false;
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serviceConfig.Type = "oneshot";
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serviceConfig.RemainAfterExit = true;
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script = ''
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if test -f "${cfg.bind.passwordFile}" ; then
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umask 0077
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conf="$(mktemp)"
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printf 'bindpw %s\n' "$(cat ${cfg.bind.passwordFile})" |
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cat ${ldapConfig.source} - >"$conf"
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mv -fT "$conf" /etc/ldap.conf
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fi
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'';
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};
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})
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(mkIf cfg.daemon.enable {
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nslcd = {
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wantedBy = [ "multi-user.target" ];
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preStart = ''
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umask 0077
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conf="$(mktemp)"
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{
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cat ${nslcdConfig}
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test -z '${cfg.bind.distinguishedName}' -o ! -f '${cfg.bind.passwordFile}' ||
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printf 'bindpw %s\n' "$(cat '${cfg.bind.passwordFile}')"
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test -z '${cfg.daemon.rootpwmoddn}' -o ! -f '${cfg.daemon.rootpwmodpwFile}' ||
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printf 'rootpwmodpw %s\n' "$(cat '${cfg.daemon.rootpwmodpwFile}')"
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} >"$conf"
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mv -fT "$conf" /run/nslcd/nslcd.conf
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'';
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restartTriggers = [
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nslcdConfig
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cfg.bind.passwordFile
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cfg.daemon.rootpwmodpwFile
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];
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serviceConfig = {
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ExecStart = "${nslcdWrapped}/bin/nslcd";
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Type = "forking";
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Restart = "always";
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User = "nslcd";
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Group = "nslcd";
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RuntimeDirectory = [ "nslcd" ];
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PIDFile = "/run/nslcd/nslcd.pid";
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AmbientCapabilities = "CAP_SYS_RESOURCE";
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};
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};
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})
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];
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};
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imports =
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[ (mkRenamedOptionModule [ "users" "ldap" "bind" "password"] [ "users" "ldap" "bind" "passwordFile"])
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];
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}
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