LDAP Can't perform an authenticated bind - Windows Server 2008 R2 Using PHP/Apache

Question

I'm having issues performing an authenticated bind against the server. The issues doesn't appear to be in code however maybe a server issue.

Just so you know;

• LDAP is enabled in Apache/PHP
• I'm connecting as [email protected]
• The domain controller has LDAP running and an entry in the firewall (Windows Server 2008 R2) The issue might be here, this was setup as a DC and is running LDAP by default. I did no special configuration on LDAP
• I can perform an anonymous bind but not an authenticated one

I can bind anonymously using this script;

$ldapconn = ldap_connect("machinename.domain.com")
    or die("Could not connect to LDAP server.");

if ($ldapconn) {

    // binding anonymously
    $ldapbind = ldap_bind($ldapconn);

    if ($ldapbind) {
        echo "LDAP bind anonymous successful...";
    } else {
        echo "LDAP bind anonymous failed...";
    }

}

However when I try to do an authenticated bind using this script, it fails.

// Authenticated Bind
$ldaprdn  = '[email protected]';     // ldap rdn or dn
$ldappass = 'password';  // associated password

// connect to ldap server
$ldapconn = ldap_connect("machinename.domain.com")
    or die("Could not connect to LDAP server.");

if ($ldapconn) {

    // binding to ldap server
    $ldapbind = ldap_bind($ldapconn, $ldaprdn, $ldappass);

    // verify binding
    if ($ldapbind) {
        echo "LDAP bind successful...";
    } else {
        echo "LDAP bind failed...";
    }

}

Where am I going wrong?

Solution

Okay, after much investigation I have turned on error info using ldap_errno() and ldap_error() and found it bringing back the error 'Strong(er) authentication required' have discovered two possible solutions;

Adjust Group Policy Settings

• Negotiate Signing (Network security: LDAP client signing requirements)

• No signing requirements (Domain Controller: LDAP server signing requirements)

• Result: Managed to bind successfully and when I enter the username or password incorrectly and it throws an 'Invalid credentials' as expected.

Enable LDAP over SSL (LDAPS)

• http://www.christowles.com/2010/11/enable-ldap-over-ssl-ldaps-on-windows.html
• http://support.microsoft.com/kb/321051

Comments

[jscott]

"[email protected]" is neither an RDN or DN, it could be a user's UPN though. Try it without the "@domain.com" or get the full DN of the object, something like "CN=username,OU=something,DC=example,DC=com". It also may help if you updated your question to detail which error message your seeing.

[Matt]

Thanks for the help guys, I've found a solution and I'll post it up shortly.