Fetch all the groups a user is member of with ldapjs

setup_passport.js

var Users = require('./Users');
var users = new Users();

passport.use(new WindowsStrategy({ 
  ldap: {
    url:             process.env["LDAP_URL"],
    base:            process.env["LDAP_BASE"],
    bindDN:          process.env["LDAP_BIND_USER"],
    bindCredentials: process.env["LDAP_BIND_PASSWORD"]
  },
  integrated: false
}, function(profile, done){
  if (!profile) return done(null, false);
  users.getAllGroups(profile._json, function (err, groups) {
    if (err) return done (err);
    profile.groups = groups.map(function (g) {
      return g.cn;
    });
    done(null, profile);
  });
}));

Users.js

var nconf = require('nconf');
var ldap  = require('ldapjs');
var async = require('async');
ldap.Attribute.settings.guid_format = ldap.GUID_FORMAT_D;

var Users = module.exports = function(){
  var options = this._options = {
    url:             process.env["LDAP_URL"],
    base:            process.env["LDAP_BASE"],
    bindDN:          process.env["LDAP_BIND_USER"],
    bindCredentials: process.env["LDAP_BIND_PASSWORD"]
  };

  this._client = ldap.createClient({
    url:            options.url,
    maxConnections: 10,
    bindDN:         options.bindDN,
    credentials:    options.bindCredentials  
  });


  this._client.on('error', function(e){
    console.log('LDAP connection error:', e);
  });

  this._queue = [];

  var self = this;
  this._client.bind(options.bindDN, options.bindCredentials, function(err) {
    if(err){
        return console.log("Error binding to LDAP", 'dn: ' + err.dn + '\n code: ' + err.code + '\n message: ' + err.message);
    }
    self.clientConnected = true;
    self._queue.forEach(function (cb) { cb(); });
  });
};

Users.prototype.getAllGroups = function (obj, callback) {
  var self = this;
  self.getGroups(obj, function (err, groups) {
    if (err) return callback(err);
    
    async.map(groups, self.getAllGroups.bind(self), function (err, res) {
      return callback(err, groups.concat.apply(groups, res));
    });
  });
};

Users.prototype.getGroups = function (obj, callback) {
  var self = this;
  
  var opts = { 
    scope: 'sub',
    filter: '(&(objectclass=group)(member=' + obj.dn + '))' 
  };
  
  self._client.search(self._options.base, opts, function(err, res){
    if (err) {
      console.log('List groups error:', err);
      return callback(err);
    }
    var entries = [];
    res.on('searchEntry', function(entry) {
      entries.push(entry);
    });

    function done () {
      if(entries.length === 0) return callback(null, []);
      var result = entries.map(function (e) { return e.object; });
      callback(null, result);
    }

    res.on('error', function(err) {
      if (err.message === 'Size Limit Exceeded') return done(); 
      callback(err);
    });
    
    res.on('end', done);
  });
};

where do you declare "passport" variable?