modules/services/databases/openldap.nix

   1 { pkgs, lib, config, ... }:
   2 let
   3   inherit (builtins) baseNameOf readFile;
   4   inherit (lib) types;
   5   inherit (pkgs.lib) unlinesAttrs;
   6   inherit (config.services) openldap;
   7   inherit (config.users) ldap;
   8 in
   9 {
  10 options = {
  11 services.openldap.cnConfig = lib.mkOption {
  12   type = types.lines;
  13   description = "The cn=config in LDIF";
  14   apply = lines: pkgs.writeText "cn=config.ldif"
  15     (lines + "\n" + unlinesAttrs (olcSuffix: {conf, olcDbDirectory, ...}:
  16       "include: file://" + pkgs.writeText "config.ldif" (conf + ''
  17         olcSuffix: ${olcSuffix}
  18         olcDbDirectory: ${olcDbDirectory}
  19       '')
  20     ) openldap.databases);
  21   default = ''
  22     dn: cn=config
  23     objectClass: olcGlobal
  24     olcLogLevel: none
  25     olcToolThreads: 1
  26
  27     dn: cn={0}module,cn=config
  28     objectClass: olcModuleList
  29     olcModulePath: ${pkgs.openldap}/lib/modules
  30     olcModuleLoad: pw-sha2
  31     olcModuleLoad: pw-pbkdf2
  32     olcModuleLoad: back_mdb
  33
  34     dn: olcDatabase={-1}frontend,cn=config
  35     objectClass: olcDatabaseConfig
  36     objectClass: olcFrontendConfig
  37     olcSizeLimit: 500
  38     # Allow unlimited access to local connection from the local root user
  39     olcAccess: to *
  40       by dn.exact=gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth manage
  41       by * break
  42     # Allow unauthenticated read access for schema and base DN autodiscovery
  43     olcAccess: to dn.exact=""
  44       by * read
  45     olcAccess: to dn.base="cn=Subschema"
  46       by * read
  47     # Hash algorithm to be used by LDAP Password Modify Extended Operation or the ppolicy overlay
  48     olcPasswordHash: {PBKDF2-SHA256}
  49
  50     dn: olcDatabase={0}config,cn=config
  51     objectClass: olcDatabaseConfig
  52     olcRootDN: cn=admin,cn=config
  53     # Access to cn=config, system root can be manager
  54     # with SASL mechanism (-Y EXTERNAL) over unix socket (-H ldapi://)
  55     olcAccess: to *
  56       by dn.exact="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" manage
  57       by * break
  58
  59     dn: cn=schema,cn=config
  60     objectClass: olcSchemaConfig
  61
  62     include: file://${pkgs.openldap}/etc/schema/core.ldif
  63     include: file://${pkgs.openldap}/etc/schema/cosine.ldif
  64     include: file://${pkgs.openldap}/etc/schema/nis.ldif
  65     include: file://${pkgs.openldap}/etc/schema/inetorgperson.ldif
  66   '';
  67 };
  68 services.openldap.databases = lib.mkOption {
  69   default = {};
  70   type = types.attrsOf (types.submodule ({name, options, config, ...}: {
  71     options = {
  72       conf = lib.mkOption {
  73         type = types.lines;
  74         description = "The database's config in LDIF.";
  75       };
  76       data = lib.mkOption {
  77         type = types.nullOr types.lines;
  78         description = "The database's data in LDIF.";
  79       };
  80       olcDbDirectory = lib.mkOption {
  81         type = types.str;
  82         description = "The directory where the database is stored.";
  83         default = "${openldap.dataDir}/${name}";
  84       };
  85     };
  86   }));
  87 };
  88 };
  89 config = lib.mkIf openldap.enable {
  90 systemd.services.openldap.preStart =
  91   # olcDbDirectory must be created before adding the config.
  92   ''
  93   set -e
  94   install -D -d -m 0700 -o "${openldap.user}" -g "${openldap.group}" "${openldap.configDir}"
  95   '' +
  96   unlinesAttrs (olcSuffix: {data, olcDbDirectory, ...}: lib.optionalString (data != null) ''
  97     rm -rf "${olcDbDirectory}"
  98     install -D -d -m 0700 -o "${openldap.user}" -g "${openldap.group}" "${olcDbDirectory}"
  99   '') openldap.databases
 100   # slapd is supposed to have been stopped by systemd
 101   # before entering this preStart,
 102   # hence slap* commands can safely be used.
 103   #
 104   # slapadd(8):
 105   # To populate the config database slapd-config(5),
 106   # use -n 0 as it is always the first database.
 107   # It must physically exist on the filesystem prior to this, however.
 108   + ''
 109   umask 0077
 110   rm -rf "${openldap.configDir}"/cn=config \
 111          "${openldap.configDir}"/cn=config.ldif
 112   ${pkgs.openldap}/bin/slapadd -n 0 \
 113    -F "${openldap.configDir}" \
 114    -l ${openldap.cnConfig}
 115   chown -R "${openldap.user}:${openldap.group}" "${openldap.configDir}"
 116   '' +
 117   unlinesAttrs (olcSuffix: {data, olcDbDirectory, ...}: lib.optionalString (data != null) ''
 118     ${pkgs.openldap}/bin/slapadd \
 119      -F "${openldap.configDir}" \
 120      -b ${olcSuffix} \
 121      -l ${pkgs.writeText "data.ldif" data}
 122     '' + ''
 123     test ! -e "${olcDbDirectory}" ||
 124     chown -R "${openldap.user}:${openldap.group}" "${olcDbDirectory}"
 125   '') openldap.databases;
 126 };
 127 }