Added loginFilter property wich overrides default pattern.
Value is java.util.RegEx, tested for full match (loginFilter.matcher(login).matches())

This is my project that I'm using to connect to Novell eDirectory. It needs some more work to be configurable, but will work in the majority of cases.

This it the output of the other attachment. To use it, you need to put the following in your main-config.xml:

<auth-type>
<login-module class="au.com.toyota.isd.jetbrains.teamcity.auth.LDAPLoginModule" />
<login-description>Login using your LDAP credentials</login-description>
<guest-login allowed="true" />
</auth-type>

and in your ldap-config.properties have:

java.naming.provider.url=ldap://ldap-server/
java.naming.security.principal=<admin principal>
java.naming.security.credentials=<admin password>
java.naming.security.authentication=simple
java.naming.referral=follow