willcode2surf / passport-windowsauth

Windows Authentication strategy for Passport.js

Windows Authentication strategy for Passport.js.

Install

npm install passport-windowsauth

Introduction

This module authenticate user with a LDAP directory. It works in two modes Integrated Authentication (often refer as NTLM) or Form Authentication.

Integrated Authentication (IIS)

In this mode, this strategy reads an special server variable from IIS (more info about this here) and then generate a profile. You can optionally pass LDAP credentials to fetch the profile from Active Directory.

In your IIS application authentication settings, disable Anonymous and enable Windows Authentication.

Configure iisnode to pass the special variable LOGON_USER from IIS to node

<configuration>
  <system.webServer>
    <!-- ... -->
    <iisnode promoteServerVars="LOGON_USER" />
  </system.webServer>
</configuration>

If you want to use it with LDAP:

var passport = require('passport');
var WindowsStrategy = require('passport-windowsauth');

passport.use(new WindowsStrategy({ 
  ldap: {
    url:             'ldap://wellscordoba.wellscordobabank.com/DC=wellscordobabank,DC=com',
    base:            'DC=wellscordobabank,DC=com',
    bindDN:          'someAccount',
    bindCredentials: 'andItsPass'
  }
}, function(profile, done){
  User.findOrCreate({ waId: profile.id }, function (err, user) {
    done(err, user);
  });
}));

If you want to use without LDAP:

var passport = require('passport');
var WindowsStrategy = require('passport-windowsauth');

passport.use(function(profile, done){
  User.findOrCreate({ waId: profile.id }, function (err, user) {
    done(err, user);
  });
}));

NOTE: in this case profile only has displayName and id, and the two variables with the same value.

Then use the strategy in a route as follows:

app.get('/express-passport', 
  passport.authenticate('WindowsAuthentication'),
  function (req, res){
    res.json(req.user);
  });

Integrated Authentication with Apache and mod_auth_kerb

You can take advantage of mod_auth_kerb in linux by using apache as a reverse proxy to your node application. The configuration is not a walk in the park but after you have everything configured it just works.

####1-Generate a keytab in windows

ktpass
-princ service/[email protected]
-mapuser [email protected]
-crypto RC4-HMAC-NT
-ptype KRB5_NT_PRINCIPAL
-pass passssswwword
-out FILE.keytab

####2-Check your /etc/krb5.conf

kinit [email protected]

You should be able to login from the linux machine.

####3-Check your keytab is okay

kinit -V -kt FILE.keytab service/[email protected]

####4-Install apache with the modules

The modules you need are mod-auth-kerb, proxy, proxy_http, headers, rewrite.

####5-Configure your apache

<VirtualHost *:8001>
  ServerAdmin webmaster@localhost

  ProxyPassInterpolateEnv On
  ProxyPass / http://localhost:3000/          # this is the node.js app
  ProxyPassReverse / http://localhost:3000/   # this is the node.js app
  RewriteEngine On
  RewriteCond %{LA-U:REMOTE_USER} (.+)
  RewriteRule . - [E=RU:%1]
  RequestHeader set X-Forwarded-User %{RU}e

  <Proxy *>
      Order deny,allow
      Allow from all
  </Proxy>

  <Location />
      AuthName "Kerberos Login"
      AuthType Kerberos
      Krb5Keytab /path/to/your/FILE.keytab    # VERY IMPORTANT
      KrbAuthRealm CONTOSO.COM
      KrbMethodNegotiate on
      KrbSaveCredentials off
      KrbVerifyKDC off
      KrbServiceName SERVICE/server.CONTOSO.COM
      Require valid-user
  </Location>

  ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
  <Directory "/usr/lib/cgi-bin">
    AllowOverride None
    Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
    Order allow,deny
    Allow from all
  </Directory>

  ErrorLog ${APACHE_LOG_DIR}/error.log

  CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

####6-Configure Passport.js

var passport = require('passport');
var WindowsStrategy = require('passport-windowsauth');

passport.use(new WindowsStrategy({ 
  ldap: {
    url:             'ldap://wellscordoba.wellscordobabank.com/DC=wellscordobabank,DC=com',
    base:            'DC=wellscordobabank,DC=com',
    bindDN:          'someAccount',
    bindCredentials: 'andItsPass'
  },
  getUserNameFromHeader: function (req) {
    //in the above apache config we set the x-forwarded-user header.
    //mod_auth_kerb uses user@domain
    return req.headers['x-forwarded-user'].split('@')[0];
  }
}, function(profile, done){
  User.findOrCreate({ waId: profile.id }, function (err, user) {
    done(err, user);
  });
}));

Non-integrated authentication

You can use this module to authenticate users against a LDAP server without integrated authentication. You will prompt the user for his username and password in a form like this:

<form action="/login" method="post">
    <div>
        <label>Username:</label>
        <input type="text" name="username"/>
    </div>
    <div>
        <label>Password:</label>
        <input type="password" name="password"/>
    </div>
    <div>
        <input type="submit" value="Log In"/>
    </div>
</form>

and then have a route like this:

app.post('/login',
  passport.authenticate('WindowsAuthentication', { 
                                  successRedirect: '/',
                                  failureRedirect: '/login',
                                  failureFlash:    true })
);

The same configuration as explained above is required with the integrated option in false:

var passport = require('passport');
var WindowsStrategy = require('passport-windowsauth');

passport.use(new WindowsStrategy({ 
  ldap: {
    url:             'ldap://wellscordoba.wellscordobabank.com/DC=wellscordobabank,DC=com',
    base:            'DC=wellscordobabank,DC=com',
    bindDN:          'someAccount',
    bindCredentials: 'andItsPass'
  },
  integrated:      false
}, function(profile, done){
  User.findOrCreate({ waId: profile.id }, function (err, user) {
    done(err, user);
  });
}));

Example profile from LDAP

When you use the LDAP integration the profile follows the Passport.js user profile convention and you have also a _json property with all the profile.

Example:

{
  "id": "fe59e96-4d82-431e-816a-5a688e4ab547",
  "displayName": "Jose Romaniello",
  "name": {
    "familyName": "Romaniello",
    "givenName": "Jose"
  },
  "emails": [
    {
      "value": "[email protected]"
    }
  ],
  "_json": {
    "dn": "CN=Jose Romaniello,CN=Users,DC=wellscordobabank,DC=com",
    "controls": [],
    "objectClass": [
      "top",
      "person",
      "organizationalPerson",
      "user"
    ],
    "cn": "Jose Romaniello",
    "sn": "Romaniello",
    "title": "cantante desafinado - programador",
    "physicalDeliveryOfficeName": "Chief Architect",
    "telephoneNumber": "[phone]",
    "givenName": "Jose",
    "distinguishedName": "CN=Jose Romaniello,CN=Users,DC=wellscordobabank,DC=com",
    "instanceType": "4",
    "whenCreated": "20130220172116.0Z",
    "whenChanged": "20130220183149.0Z",
    "displayName": "Jose Romaniello",
    "uSNCreated": "12717",
    "uSNChanged": "12792",
    "company": "Wells Cordoba Bank",
    "name": "Jose Romaniello",
    "objectGUID": "fe59e96-4d82-431e-816a-5a688e4ab547",
    "userAccountControl": "66048",
    "badPwdCount": "0",
    "codePage": "0",
    "countryCode": "0",
    "badPasswordTime": "0",
    "lastLogoff": "0",
    "lastLogon": "0",
    "pwdLastSet": "130058544776047558",
    "primaryGroupID": "513",
    "objectSid": "\u0001\u0005\u0000\u0000\u0000\u0000\u0000\u0005\u0015\u0000\u0000\u0000��=��\u001d��uQ��O\u0004\u0000\u0000",
    "accountExpires": "9223372036854775807",
    "logonCount": "0",
    "sAMAccountName": "jromaniello",
    "sAMAccountType": "805306368",
    "userPrincipalName": "[email protected]",
    "objectCategory": "CN=Person,CN=Schema,CN=Configuration,DC=wellscordobabank,DC=com",
    "dSCorePropagationData": [
      "20130220172118.0Z",
      "16010101000000.0Z"
    ],
    "lastLogonTimestamp": "130058572786126285",
    "mail": "[email protected]"
  }
}

License

MIT 2013!