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    <p>As ioplex and others have said, there are many options. To authenticate using LDAP (and the Novell LDAP API), I have used something like:</p> <pre><code> LDAPConnection connection = new LDAPConnection( new LDAPJSSEStartTLSFactory() ); connection.connect(hostname, port); connection.startTLS(); connection.bind(LDAPConnection.LDAP_V3, username+"@"+domain, password.getBytes()); </code></pre> <p>As a "special feature", Active Directory allows LDAP binds against "user@domain" without using the distinguished name of the account. This code uses StartTLS to enable TLS encryption on the connection; the other alternative is LDAP over SSL, which is not supported by <em>my</em> AD servers.</p> <p>The real trick is in locating the server and host; the official way is to use a DNS SRV (service) record lookup to locate a bundle of candidate hosts, then do a UDP-based LDAP "ping" (in a particular Microsoft format) to locate the correct server. If you are interested, I've posted some <a href="http://maniagnosis.crsr.net/2009/09/locating-active-directory-server-pt-1.html" rel="nofollow noreferrer">blog articles</a> about my journey of adventure and discovery in that area.</p> <p>If you want to do Kerberos-based username/password authentication, you are looking at another kettle of fish; it is doable with the Java GSS-API code, although I am not sure it performs the final step to validate the authentication. (The code doing the validation can contact the AD server to check the username and password, which results in a ticket granting ticket for the user, but to ensure the AD server is not being impersonated, it also needs to try to get a ticket for the user to itself, which is somewhat more complicated.)</p> <p>If you want to do Kerberos-based single sign-on, assuming your users are authenticated to the domain, you can do that as well with the Java GSS-API code. I would post a code sample, but I still need to turn my hideous prototype into something fit for human eyes. Check out <a href="https://fisheye.springsource.org/browse/se-security/trunk/spring-security-kerberos/spring-security-kerberos-core/src/main/java/org/springframework/security/extensions/kerberos/SunJaasKerberosTicketValidator.java?r=HEAD" rel="nofollow noreferrer">some code from SpringSource</a> for some inspiration.</p> <p>If you are looking for NTLM (which I was given to understand is less secure) or something else, well, good luck.</p>
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    1. POAuthenticating against Active Directory with Java on Linux
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    1. USTommy McGuire
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