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POHow to translate a domain name to LDAP DC when working in a Active Directory forest in Java?
 

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  1. POHow to translate a domain name to LDAP DC when working in a Active Directory forest in Java?
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    <p>I am struggling with a problem where I wasn't able to find a lean and generic solution. This is my situation:</p> <p>I am in a huge AD forest with > 20 sub domains replicating over several hundreds servers. Say the main domain and Kerberos realm is <code>COMPANY.COM</code> and I am working in <code>D1.COMPANY.COM</code>. I do connect from Java to the global catalog and are able to access the entire forrest to support all company users.</p> <p>My connection URL is like this: <code>ldap://mycompany.com:3268/DC=company,DC=com</code></p> <p>The entire stuff is running in a webapp using SPNEGO to authenticate the users which works very well. I.e., after sucessful login I do receive the users UPN/Kerberos principal. Due to some reasons all UPN fields in the forest where altered to match user's email address rather to leave the UPN value intact. This means that I an not able to search for the search by the krb princ but I have to strip out the username and search by <code>sAMAccountName</code>. I presumed the <code>sAMAccountName</code> is unique in the entire forest until a user failed to login yesterday. After some LDAP query magic I figured out that two users have the same <code>sAMAccountName</code> in two different domains. My search fails.</p> <p>So the issue is, how do I determine the base DN/DC of a realm/sub domain based in the Kerberos realm?</p> <p>I figured out several approaches with a stripped realm string:</p> <ol> <li>constuct an LDAP URL and connect to and read defaultNamingContext</li> <li>reformat domain name to DC=d1,DC...</li> </ol> <p>Currently, I am using approach 2 which seems to be the easiest way. Altough some C# post here on stack overflow said that this might fail due to disjoint spaces.</p> <p>Is anyone aware of a safe solution? The best would be actually to translate Kerberos principals to user principal names.</p>
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    1. COsamAccountName is unique across the forest. Otherwise there is some serious problem in your servers. Probably the GC is out of sync on those two servers?
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      1. POHow to translate a domain name to LDAP DC when working in a Active Directory forest in Java?
      1. USkalyan
    2. CO@kalyan Actually it's not. It has to be according to [this](http://technet.microsoft.com/en-us/library/ee198826.aspx) article. It seems that the admin guys were really sloppy. I double-checked ti and their account creation script verifies against the domain only. This is pita. The accounts where created years ago and the last change time is old.
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      1. USMichael-O
 

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