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package com.sap.dbtech.util.security;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import com.sap.dbtech.jdbc.exceptions.SQLExceptionSapDB;
import com.sap.dbtech.jdbc.packet.DataPartVariable;
import com.sap.dbtech.util.MessageKey;
import com.sap.dbtech.util.MessageTranslator;
import com.sap.dbtech.util.StructuredBytes;
import com.sap.dbtech.util.Tracer;
import com.sap.dbtech.vsp001.Packet;
/*
created by D031096
========== licence begin GPL
Copyright (C) 2002-2003 SAP AG
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
========== licence end
*/
public class Authentication {
private byte[] salt;
private byte[] clientchallenge;
private byte[] serverchallenge;
private int maxpasswordLen = 0;
private static SecureRandom srnd = new SecureRandom();
public Authentication() throws java.security.NoSuchAlgorithmException {
clientchallenge = new byte[64];
int retrycount = 10; //workaround for buggy vm on IBM J9SE VM (build 2.2, J2RE 1.4.2 IBM J9 2.2 Linux amd64-64)
while (true) {
try {
srnd.nextBytes(
getClientchallenge());
return;
} catch (Exception e) {
if (--retrycount <= 0) {
throw new java.security.NoSuchAlgorithmException(e.toString());
}
}
}
}
/**
* @return Returns the clientchallenge.
*/
public byte[] getClientchallenge() {
return clientchallenge;
}
/**
* @return Returns the clientchallenge.
*/
public byte[] getClientProof(byte[] password) throws SQLExceptionSapDB {
try {
return SCRAMMD5.scrammMD5(salt, password, clientchallenge,
serverchallenge);
} catch (NoSuchAlgorithmException ex) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
"NoSuchAlgorithmException - algorithm \"MD5\" not supported by the java vm"));
}
}
/**
* @param serverchallenge
* Parses the serverchallenge and split it into salt and real
* server challenge.
*/
public void parseServerChallenge(byte[] vData)
throws SQLExceptionSapDB {
DataPartVariable vd = new DataPartVariable( new StructuredBytes (
vData), 1);
if (!vd.nextRow() || !vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData)));
}
this.salt = vd.getBytes(vd.getCurrentOffset(),vd.getCurrentFieldLen());
if (!vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData)));
}
this.serverchallenge = vd.getBytes(vd.getCurrentOffset(),vd.getCurrentFieldLen());
}
/**
* @param serverchallenge
* Parses the serverchallenge and split it into salt and real
* server challenge.
*/
public void parseServerChallengeReply(DataPartVariable vData)
throws SQLExceptionSapDB {
if (!vData.nextRow() || !vData.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
String algo = vData.getString(vData.getCurrentOffset(), vData
.getCurrentFieldLen());
if (!algo.equals(SCRAMMD5.algorithmname)) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
if (!vData.nextField() || vData.getCurrentFieldLen() < 8) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
if (vData.getCurrentFieldLen() == 40){
/*first version of challenge response
*should only occurs with database version 7.6.0.0 <= kernel <= 7.6.0.7*/
this.salt = vData.getBytes(vData.getCurrentOffset(), 8);
this.serverchallenge = vData.getBytes(vData.getCurrentOffset() + 8,
vData.getCurrentFieldLen() - 8);
} else {
DataPartVariable vd = new DataPartVariable( new StructuredBytes (
vData.getBytes(vData.getCurrentOffset(), vData.getCurrentFieldLen())), 1);
if (!vd.nextRow() || !vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
this.salt = vd.getBytes(vd.getCurrentOffset(),vd.getCurrentFieldLen());
if (!vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
this.serverchallenge = vd.getBytes(vd.getCurrentOffset(),vd.getCurrentFieldLen());
/*from Version 7.6.0.10 on also the max password length will be delivered*/
if (vData.nextField()){
DataPartVariable mp_vd = new DataPartVariable( new StructuredBytes (
vData.getBytes(vData.getCurrentOffset(), vData.getCurrentFieldLen())), 1);
if (!mp_vd.nextRow() || !mp_vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
do {
if (mp_vd.getString(mp_vd.getCurrentOffset(),mp_vd.getCurrentFieldLen()).equals(Packet.csp1_maxpasswordlen_tag_C)){
if (!mp_vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}else{
try {
this.maxpasswordLen = Integer.parseInt(mp_vd.getString(mp_vd.getCurrentOffset(),mp_vd.getCurrentFieldLen())) ;
} catch (NumberFormatException e) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
}
} else {
if (!mp_vd.nextField()) {
throw new SQLExceptionSapDB
(MessageTranslator.translate
(MessageKey.ERROR_CONNECTION_WRONGSERVERCHALLENGERECEIVED,
Tracer.Hex2String(vData.getBytes(0,vData.size()))));
}
}
} while (mp_vd.nextField());
}
}
}
public int getMaxpasswordLen() {
return maxpasswordLen;
}
}
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