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	/*
	* Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package com.sun.security.ntlm;

	import java.util.Arrays;
	import java.util.Locale;

	/**
	* The NTLM server, not multi-thread enabled.<p>
	* Example:
	* <pre>
	* Server server = new Server(null, "REALM") {
	* public char[] getPassword(String ntdomain, String username) {
	* switch (username) {
	* case "dummy": return "t0pSeCr3t".toCharArray();
	* case "guest": return "".toCharArray();
	* default: return null;
	* }
	* }
	* };
	* // Receive client request as type1
	* byte[] type2 = server.type2(type1, nonce);
	* // Send type2 to client and receive type3
	* verify(type3, nonce);
	* </pre>
	*/
	public abstract class Server extends NTLM {
	final private String domain;
	final private boolean allVersion;
	/**
	* Creates a Server instance.
	* @param version the NTLM version to use, which can be:
	* <ul>
	* <li>NTLM: Original NTLM v1
	* <li>NTLM2: NTLM v1 with Client Challenge
	* <li>NTLMv2: NTLM v2
	* </ul>
	* If null, all versions will be supported. Please note that unless NTLM2
	* is selected, authentication succeeds if one of LM (or LMv2) or
	* NTLM (or NTLMv2) is verified.
	* @param domain the domain, must not be null
	* @throws NTLMException if {@code domain} is null.
	*/
	public Server(String version, String domain) throws NTLMException {
	super(version);
	if (domain == null) {
	throw new NTLMException(NTLMException.PROTOCOL,
	"domain cannot be null");
	}
	this.allVersion = (version == null);
	this.domain = domain;
	debug("NTLM Server: (t,version) = (%s,%s)\n", domain, version);
	}

	/**
	* Generates the Type 2 message
	* @param type1 the Type1 message received, must not be null
	* @param nonce the random 8-byte array to be used in message generation,
	* must not be null
	* @return the message generated
	* @throws NTLMException if the incoming message is invalid, or
	* {@code nonce} is null.
	*/
	public byte[] type2(byte[] type1, byte[] nonce) throws NTLMException {
	if (nonce == null) {
	throw new NTLMException(NTLMException.PROTOCOL,
	"nonce cannot be null");
	}
	debug("NTLM Server: Type 1 received\n");
	if (type1 != null) debug(type1);
	Writer p = new Writer(2, 32);
	// Negotiate NTLM2 Key, Target Type Domain,
	// Negotiate NTLM, Request Target, Negotiate unicode
	int flags = 0x90205;
	p.writeSecurityBuffer(12, domain, true);
	p.writeInt(20, flags);
	p.writeBytes(24, nonce);
	debug("NTLM Server: Type 2 created\n");
	debug(p.getBytes());
	return p.getBytes();
	}

	/**
	* Verifies the Type3 message received from client and returns
	* various negotiated information.
	* @param type3 the incoming Type3 message from client, must not be null
	* @param nonce the same nonce provided in {@link #type2}, must not be null
	* @return client username, client hostname, and the request target
	* @throws NTLMException if the incoming message is invalid, or
	* {@code nonce} is null.
	*/
	public String[] verify(byte[] type3, byte[] nonce)
	throws NTLMException {
	if (type3 == null \|\| nonce == null) {
	throw new NTLMException(NTLMException.PROTOCOL,
	"type1 or nonce cannot be null");
	}
	debug("NTLM Server: Type 3 received\n");
	if (type3 != null) debug(type3);
	Reader r = new Reader(type3);
	String username = r.readSecurityBuffer(36, true);
	String hostname = r.readSecurityBuffer(44, true);
	String incomingDomain = r.readSecurityBuffer(28, true);
	/*if (incomingDomain != null && !incomingDomain.equals(domain)) {
	throw new NTLMException(NTLMException.DOMAIN_UNMATCH,
	"Wrong domain: " + incomingDomain +
	" vs " + domain); // Needed?
	}*/

	boolean verified = false;
	char[] password = getPassword(incomingDomain, username);
	if (password == null) {
	throw new NTLMException(NTLMException.USER_UNKNOWN,
	"Unknown user");
	}
	byte[] incomingLM = r.readSecurityBuffer(12);
	byte[] incomingNTLM = r.readSecurityBuffer(20);

	if (!verified && (allVersion \|\| v == Version.NTLM)) {
	if (incomingLM.length > 0) {
	byte[] pw1 = getP1(password);
	byte[] lmhash = calcLMHash(pw1);
	byte[] lmresponse = calcResponse (lmhash, nonce);
	if (Arrays.equals(lmresponse, incomingLM)) {
	verified = true;
	}
	}
	if (incomingNTLM.length > 0) {
	byte[] pw2 = getP2(password);
	byte[] nthash = calcNTHash(pw2);
	byte[] ntresponse = calcResponse (nthash, nonce);
	if (Arrays.equals(ntresponse, incomingNTLM)) {
	verified = true;
	}
	}
	debug("NTLM Server: verify using NTLM: " + verified + "\n");
	}
	if (!verified && (allVersion \|\| v == Version.NTLM2)) {
	byte[] pw2 = getP2(password);
	byte[] nthash = calcNTHash(pw2);
	byte[] clientNonce = Arrays.copyOf(incomingLM, 8);
	byte[] ntlmresponse = ntlm2NTLM(nthash, clientNonce, nonce);
	if (Arrays.equals(incomingNTLM, ntlmresponse)) {
	verified = true;
	}
	debug("NTLM Server: verify using NTLM2: " + verified + "\n");
	}
	if (!verified && (allVersion \|\| v == Version.NTLMv2)) {
	byte[] pw2 = getP2(password);
	byte[] nthash = calcNTHash(pw2);
	if (incomingLM.length > 0) {
	byte[] clientNonce = Arrays.copyOfRange(
	incomingLM, 16, incomingLM.length);
	byte[] lmresponse = calcV2(nthash,
	username.toUpperCase(Locale.US)+incomingDomain,
	clientNonce, nonce);
	if (Arrays.equals(lmresponse, incomingLM)) {
	verified = true;
	}
	}
	if (incomingNTLM.length > 0) {
	// We didn't sent alist in type2(), so there
	// is nothing to check here.
	byte[] clientBlob = Arrays.copyOfRange(
	incomingNTLM, 16, incomingNTLM.length);
	byte[] ntlmresponse = calcV2(nthash,
	username.toUpperCase(Locale.US)+incomingDomain,
	clientBlob, nonce);
	if (Arrays.equals(ntlmresponse, incomingNTLM)) {
	verified = true;
	}
	}
	debug("NTLM Server: verify using NTLMv2: " + verified + "\n");
	}
	if (!verified) {
	throw new NTLMException(NTLMException.AUTH_FAILED,
	"None of LM and NTLM verified");
	}
	return new String[] {username, hostname, incomingDomain};
	}

	/**
	* Retrieves the password for a given user. This method should be
	* overridden in a concrete class.
	* @param domain can be null
	* @param username must not be null
	* @return the password for the user, or null if unknown
	*/
	public abstract char[] getPassword(String domain, String username);
	}

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