Is there an ntlm_auth function in java

You can try Jespa or Waffle (if you run on Windows)

Nope, running on Linux.

Most probably , you should do this by utilising LDAP , but not sure how exactly . But then , did you check this :
http://www.javaxt.com/Tutorials/Windows/How_to_Authenticate_Users_with_Active_Directory

My "if you run on Windows" was for Waffle. Jespa is platform independent and it should work on Linux.

arioh: Sorry, I didn't get that your "Windows" comment applied to Waffle only. I'm downloading Jespa now and will experiment.

Sharon Seth: That link looks interesting and (relatively) compact. All I need is Authentication and Jespa might be overkill -- if I can get it to work. The ActiveDirectory.java source listed on the link site compiled with an odd warning I've not see before:

$ javac ActiveDirectory.java
Note: ActiveDirectory.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

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Running with the recommended -Xlint:unchecked gives:

ActiveDirectory.java:88: warning: [unchecked] unchecked call to put(K,V) as a member of the raw type Hashtable
        props.put(Context.SECURITY_PRINCIPAL, principalName);
                 ^
  where K,V are type-variables:
    K extends Object declared in class Hashtable
    V extends Object declared in class Hashtable
:

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and 3 more similar warnings on the pros.put() function ... which is equally unintelligible to me. Also, the compile results in 4 class files:

ActiveDirectory.class
ActiveDirectory$User.class
ActiveDirectory$User$2.class
ActiveDirectory$User$1.class

I've created jarfiles and such, but never really seen this kind of compile results. Suggestion on what to do with them? Put them all into a jarfile?

I'm experimenting with the ActiveDirectory.java code in Sharon Seth's link, but classpaths and jarfiles continuously stump me. I've put the class files shown in my previous post into the directory ActiveDirectory/ and create a jarfile - ActiveDirectory.jar. I could use some java coding help to get this referenced properly:

$ cp ActiveDirecotry*.class ActiveDirectory/
$ jar -cvf ActiveDirectory.jar ActiveDirecotry

>jar tvf ActiveDirectory.jar
     0 Wed Feb 04 11:56:20 EST 2015 META-INF/
    68 Wed Feb 04 11:56:20 EST 2015 META-INF/MANIFEST.MF
     0 Wed Feb 04 11:55:56 EST 2015 ActiveDirectory/
   520 Wed Feb 04 11:48:52 EST 2015 ActiveDirectory/ActiveDirectory$User$1.class
   705 Wed Feb 04 11:48:52 EST 2015 ActiveDirectory/ActiveDirectory$User$2.class
  4507 Wed Feb 04 11:48:52 EST 2015 ActiveDirectory/ActiveDirectory$User.class
  5347 Wed Feb 04 11:48:52 EST 2015 ActiveDirectory/ActiveDirectory.class

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I then created a test program:

import ActiveDirectory.*;

class testActiveDirectory {

public static void main(String[] args)
{
    try{
        LdapContext ctx = ActiveDirectory.getConnection("mark", "glacon_9");
        ctx.close();
    }
    catch(Exception e){
        //Failed to authenticate user!
        e.printStackTrace();
    }
}
}

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added the jarfile to my classpath:

export CLASSPATH=$CLASSPATH:$HOME/java/ActiveDirectory.jar

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And tried to compile the test program:

javac testActiveDirectory.java
testActiveDirectory.java:9: error: cannot find symbol
        LdapContext ctx = ActiveDirectory.getConnection("mark", "glacon_9");
        ^
  symbol:   class LdapContext
  location: class testActiveDirectory
testActiveDirectory.java:9: error: cannot access ActiveDirectory
        LdapContext ctx = ActiveDirectory.getConnection("bob", "password","domain");
                          ^
  bad class file: /home/mfoley/java/ActiveDirectory.jar(ActiveDirectory/ActiveDirectory.class)
    class file contains wrong class: javaxt.security.ActiveDirectory
    Please remove or make sure it appears in the correct subdirectory of the classpath.
2 errors

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So, my first hurdle is lack of expertise in java. Could one of you gurus tell me what I'm doing wrong here?

You have wrong package (jar) structure for ActiveDirectory.jar

$ cp ActiveDirecotry*.class javaxt/security/
$ jar -cvf ActiveDirectory.jar javaxt

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OK, I see, because of the "package javaxt.sercurity;" in the first line of the ActiveDirectory.java program.

Still errors. Is my import statement wrong? The ActiveDirectory.java program does import javax.naming.ldap.LdapContext in line 12.

program:

import javaxt.security.ActiveDirectory.*;

class testActiveDirectory {

public static void main(String[] args)
{
    try{
        LdapContext ctx = ActiveDirectory.getConnection("mark", "glacon_9");
        ctx.close();
    }
    catch(Exception e){
        //Failed to authenticate user!
        e.printStackTrace();
    }
}
}

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errors:

$ javac testActiveDirectory.java
testActiveDirectory.java:9: error: cannot find symbol
        LdapContext ctx = ActiveDirectory.getConnection("mark", "glacon_9");
        ^
  symbol:   class LdapContext
  location: class testActiveDirectory
testActiveDirectory.java:9: error: cannot find symbol
        LdapContext ctx = ActiveDirectory.getConnection("user", "password");
                          ^
  symbol:   variable ActiveDirectory
  location: class testActiveDirectory
2 errors

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I figured out a working solution not related to the proposed solutions. I could not get the proposed solutions to work and received no further ideas on how to get them to work.