net.sourceforge.jtds.jdbc

Class NtlmAuth

java.lang.Object

net.sourceforge.jtds.jdbc.NtlmAuth

public class NtlmAuth
extends java.lang.Object

This class calculates the two "responses" to the nonce supplied by the server as a part of NTLM authentication. Much gratitude to the authors of this page, esp. for NTLMv2 info: http://davenport.sourceforge.net/ntlm.html

Version:

$Id: NtlmAuth.java,v 1.7 2006-06-23 18:00:56 matt_brinkley Exp $

Author:

Matt Brinkley

Constructor Summary

Constructors

Constructor and Description
NtlmAuth()

Method Summary

Methods

Modifier and Type	Method and Description
static byte[]	answerLmChallenge(java.lang.String pwd, byte[] nonce)
static byte[]	answerLmv2Challenge(java.lang.String domain, java.lang.String user, java.lang.String password, byte[] nonce, byte[] clientNonce)
static byte[]	answerNtChallenge(java.lang.String password, byte[] nonce)
static byte[]	answerNtlmv2Challenge(java.lang.String domain, java.lang.String user, java.lang.String password, byte[] nonce, byte[] targetInfo, byte[] clientNonce)
static byte[]	answerNtlmv2Challenge(java.lang.String domain, java.lang.String user, java.lang.String password, byte[] nonce, byte[] targetInfo, byte[] clientNonce, byte[] timestamp)
static byte[]	answerNtlmv2Challenge(java.lang.String domain, java.lang.String user, java.lang.String password, byte[] nonce, byte[] targetInfo, byte[] clientNonce, long now)
private static byte[]	convertPassword(java.lang.String password) Used by answerNtlmChallenge.
private static byte[]	createBlob(byte[] targetInformation, byte[] clientChallenge, byte[] timestamp) Creates the NTLMv2 blob from the given target information block and client challenge.
static byte[]	createTimestamp(long time) Creates a timestamp in the format used in NTLMv2 responses.
private static byte[]	encryptNonce(byte[] key, byte[] nonce)
private static byte[]	hmacMD5(byte[] data, byte[] key) Calculates the HMAC-MD5 hash of the given data using the specified hashing key.
private static byte[]	lmv2Response(byte[] hash, byte[] clientData, byte[] challenge) Creates the LMv2 Response from the given hash, client data, and Type 2 challenge.
private static byte[]	makeDESkey(byte[] buf, int off) Turns a 7-byte DES key into an 8-byte one by adding parity bits.
private static byte[]	md5(byte[] data)
private static byte[]	ntHash(java.lang.String password) Creates the md4 hash of the unicode password.
private static byte[]	ntv2Hash(java.lang.String domain, java.lang.String user, java.lang.String password)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NtlmAuth

public NtlmAuth()

Method Detail

answerNtChallenge

public static byte[] answerNtChallenge(java.lang.String password,
                       byte[] nonce)
                                throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

answerLmChallenge

public static byte[] answerLmChallenge(java.lang.String pwd,
                       byte[] nonce)
                                throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

answerNtlmv2Challenge

public static byte[] answerNtlmv2Challenge(java.lang.String domain,
                           java.lang.String user,
                           java.lang.String password,
                           byte[] nonce,
                           byte[] targetInfo,
                           byte[] clientNonce)
                                    throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

answerNtlmv2Challenge

public static byte[] answerNtlmv2Challenge(java.lang.String domain,
                           java.lang.String user,
                           java.lang.String password,
                           byte[] nonce,
                           byte[] targetInfo,
                           byte[] clientNonce,
                           byte[] timestamp)
                                    throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

answerNtlmv2Challenge

public static byte[] answerNtlmv2Challenge(java.lang.String domain,
                           java.lang.String user,
                           java.lang.String password,
                           byte[] nonce,
                           byte[] targetInfo,
                           byte[] clientNonce,
                           long now)
                                    throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

answerLmv2Challenge

public static byte[] answerLmv2Challenge(java.lang.String domain,
                         java.lang.String user,
                         java.lang.String password,
                         byte[] nonce,
                         byte[] clientNonce)
                                  throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

ntv2Hash

private static byte[] ntv2Hash(java.lang.String domain,
              java.lang.String user,
              java.lang.String password)
                        throws java.io.UnsupportedEncodingException

Throws:

java.io.UnsupportedEncodingException

lmv2Response

private static byte[] lmv2Response(byte[] hash,
                  byte[] clientData,
                  byte[] challenge)

Creates the LMv2 Response from the given hash, client data, and Type 2 challenge.

Parameters:

hash - The NTLMv2 Hash.

clientData - The client data (blob or client challenge).

challenge - The server challenge from the Type 2 message.

Returns:

The response (either NTLMv2 or LMv2, depending on the client data).

hmacMD5

private static byte[] hmacMD5(byte[] data,
             byte[] key)

Calculates the HMAC-MD5 hash of the given data using the specified hashing key.

Parameters:

data - The data for which the hash will be calculated.

key - The hashing key.

Returns:

The HMAC-MD5 hash of the given data.

md5

private static byte[] md5(byte[] data)

createTimestamp

public static byte[] createTimestamp(long time)

Creates a timestamp in the format used in NTLMv2 responses. Public so it could be unit tested.

Parameters:

time - current time, as returned from System.currentTimeMillis

Returns:

little-endian byte array of number of tenths of microseconds since Jan 1, 1601

createBlob

private static byte[] createBlob(byte[] targetInformation,
                byte[] clientChallenge,
                byte[] timestamp)

Creates the NTLMv2 blob from the given target information block and client challenge.

Parameters:

targetInformation - The target information block from the Type 2 message.

clientChallenge - The random 8-byte client challenge.

Returns:

The blob, used in the calculation of the NTLMv2 Response.

encryptNonce

private static byte[] encryptNonce(byte[] key,
                  byte[] nonce)

ntHash

private static byte[] ntHash(java.lang.String password)
                      throws java.io.UnsupportedEncodingException

Creates the md4 hash of the unicode password. This is used as the DES key when encrypting the nonce for NTLM challenge-response

Throws:

java.io.UnsupportedEncodingException

convertPassword

private static byte[] convertPassword(java.lang.String password)
                               throws java.io.UnsupportedEncodingException

Used by answerNtlmChallenge. We need the password converted to caps, narrowed and padded/truncated to 14 chars...

Throws:

java.io.UnsupportedEncodingException

makeDESkey

private static byte[] makeDESkey(byte[] buf,
                int off)

Turns a 7-byte DES key into an 8-byte one by adding parity bits. All implementations of DES seem to want an 8-byte key.