Read objectGUID from active directory

Question

I'm trying to get information from AD using node.js. I've tried activedirectory and ldapauth-fork and in general the code works, but if I need some octetstring data like objectGUID, I see a rubbish string in the object. I found that binary data is converted into a string as utf-8. But the problem is that the data is damaged during convertion (a lot of cahrs with 65533 code) and I can't revert the string to original binary.

How can I access data in octetstring format to get correct binary representation?

const ActiveDirectory = require('activedirectory');

const config = {
  url: 'LDAP://ldap.example.com',
  baseDN: 'OU=Users,DC=example,DC=com',
  username: 'user@example.com',
  password: 'password'
};

const ad = new ActiveDirectory(config);

const query = { 
  filter: '(objectClass=user)',
  attributes: ["dn", "cn", "objectGUID", "objectSid"]
};

ad.findUsers(query, function (err, result) {
  if (err) {
    return console.error(err);
  }

  console.log(result.length);
  console.log(result[0]); // objectGUID contains rubbish
  console.log([...result[0].objectGUID].map(ch => ch.charCodeAt(0)));
});

score 0 · Accepted Answer · answered Oct 18 '17 at 14:02

entryParser is there for that purpose:

const ActiveDirectory = require('activedirectory');

const config = {
  url: 'LDAP://ldap.example.com',
  baseDN: 'OU=Users,DC=example,DC=com',
  username: 'user@example.com',
  password: 'password',
  entryParser(entry, raw, callback) {
    if (raw.hasOwnProperty("objectGUID")) { entry.objectGUID = raw.objectGUID; }
    callback(entry);
  }
};

const ad = new ActiveDirectory(config);

const query = { 
  filter: '(objectClass=user)',
  attributes: ["dn", "cn", "objectGUID", "objectSid"]
};

ad.findUsers(query, function (err, result) {
  if (err) {
    return console.error(err);
  }

  console.log(result.length);
  console.log(result[0]); // objectGUID contains Buffer with strange byte order
  console.log(result[0].objectGUID
    .toString('hex')
    .replace(
      /^(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)(..)$/,
      "{$4$3$2$1-$6$5-$8$7-$10$9-$16$15$14$13$12$11}"
    ).toUpperCase() // Normal guid, conversion could be moved into the parser
  );
});

Read objectGUID from active directory

1 Answers1

Linked