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package gnu.crypto.sasl.srp;
// ----------------------------------------------------------------------------
// $Id: SRPClient.java,v 1.6 2003/12/25 01:51:20 uid66198 Exp $
//
// Copyright (C) 2003 Free Software Foundation, Inc.
//
// This file is part of GNU Crypto.
//
// GNU Crypto 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, or (at your option)
// any later version.
//
// GNU Crypto 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; see the file COPYING. If not, write to the
//
// Free Software Foundation Inc.,
// 59 Temple Place - Suite 330,
// Boston, MA 02111-1307
// USA
//
// Linking this library statically or dynamically with other modules is
// making a combined work based on this library. Thus, the terms and
// conditions of the GNU General Public License cover the whole
// combination.
//
// As a special exception, the copyright holders of this library give
// you permission to link this library with independent modules to
// produce an executable, regardless of the license terms of these
// independent modules, and to copy and distribute the resulting
// executable under terms of your choice, provided that you also meet,
// for each linked independent module, the terms and conditions of the
// license of that module. An independent module is a module which is
// not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the
// library, but you are not obligated to do so. If you do not wish to
// do so, delete this exception statement from your version.
// ----------------------------------------------------------------------------
import gnu.crypto.Registry;
import gnu.crypto.key.IKeyAgreementParty;
import gnu.crypto.key.IncomingMessage;
import gnu.crypto.key.KeyAgreementFactory;
import gnu.crypto.key.KeyAgreementException;
import gnu.crypto.key.OutgoingMessage;
import gnu.crypto.key.srp6.SRP6KeyAgreement;
import gnu.crypto.assembly.Direction;
import gnu.crypto.cipher.CipherFactory;
import gnu.crypto.cipher.IBlockCipher;
import gnu.crypto.hash.MD5;
import gnu.crypto.sasl.ClientMechanism;
import gnu.crypto.sasl.IllegalMechanismStateException;
import gnu.crypto.sasl.InputBuffer;
import gnu.crypto.sasl.IntegrityException;
import gnu.crypto.sasl.OutputBuffer;
import gnu.crypto.util.PRNG;
import gnu.crypto.util.Util;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.StringTokenizer;
import javax.security.auth.callback.Callback;
import javax.security.auth.callback.NameCallback;
import javax.security.auth.callback.PasswordCallback;
import javax.security.auth.callback.UnsupportedCallbackException;
import javax.security.sasl.AuthenticationException;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslException;
/**
* The SASL-SRP client-side mechanism.
*
* @version $Revision: 1.6 $
*/
public class SRPClient extends ClientMechanism implements SaslClient {
// Debugging methods and variables
// -------------------------------------------------------------------------
private static final String NAME = "SRPClient";
// private static final String ERROR = "ERROR";
// private static final String WARN = " WARN";
private static final String INFO = " INFO";
private static final String TRACE = "DEBUG";
private static final boolean DEBUG = true;
private static final int debuglevel = 3;
private static final PrintWriter err = new PrintWriter(System.out, true);
private static void debug(final String level, final Object obj) {
err.println("["+level+"] "+NAME+": "+String.valueOf(obj));
}
// Constants and variables
// -------------------------------------------------------------------------
// private static final HashMap uid2ctx = new HashMap();
private String uid; // the unique key for this type of client
private String U; // the authentication identity
BigInteger N, g, A, B;
private char[] password; // the authentication credentials
private byte[] s; // the user's salt
private byte[] cIV, sIV; // client+server IVs, when confidentiality is on
private byte[] M1, M2; // client+server evidences
private byte[] cn, sn; // client's and server's nonce
private SRP srp; // SRP algorithm instance used by this client
private byte[] sid; // session ID when re-used
private int ttl; // session time-to-live in seconds
private byte[] sCB; // the peer's channel binding data
private String L; // available options
private String o;
private String chosenIntegrityAlgorithm;
private String chosenConfidentialityAlgorithm;
private int rawSendSize = Registry.SASL_BUFFER_MAX_LIMIT;
private byte[] K; // shared session key
private boolean replayDetection = true; // whether Replay Detection is on
private int inCounter = 0; // messages sequence numbers
private int outCounter = 0;
private IALG inMac, outMac; // if !null, use for integrity
private CALG inCipher, outCipher; // if !null, use for confidentiality
private IKeyAgreementParty clientHandler =
KeyAgreementFactory.getPartyAInstance(Registry.SRP_SASL_KA);
// Constructor(s)
// -------------------------------------------------------------------------
public SRPClient() {
super(Registry.SASL_SRP_MECHANISM);
}
// Class methods
// -------------------------------------------------------------------------
// Instance methods
// -------------------------------------------------------------------------
// abstract methods implementation -----------------------------------------
protected void initMechanism() throws SaslException {
// we shall keep track of the sid (and the security context of this
// SRP client) based on the initialisation parameters of an SRP session.
// we shall compute a unique key for those parameters and key the sid
// (and the security context) accordingly.
// 1. compute the mapping key. use MD5 (the fastest) for this purpose
final MD5 md = new MD5();
byte[] b;
b = authorizationID.getBytes();
md.update(b, 0, b.length);
b = serverName.getBytes();
md.update(b, 0, b.length);
b = protocol.getBytes();
md.update(b, 0, b.length);
if (channelBinding.length > 0) {
md.update(channelBinding, 0, channelBinding.length);
}
uid = Util.toBase64(md.digest());
if (ClientStore.instance().isAlive(uid)) {
final SecurityContext ctx = ClientStore.instance().restoreSession(uid);
srp = SRP.instance(ctx.getMdName());
sid = ctx.getSID();
K = ctx.getK();
cIV = ctx.getClientIV();
sIV = ctx.getServerIV();
replayDetection = ctx.hasReplayDetection();
inCounter = ctx.getInCounter();
outCounter = ctx.getOutCounter();
inMac = ctx.getInMac();
outMac = ctx.getOutMac();
inCipher = ctx.getInCipher();
outCipher = ctx.getOutCipher();
} else {
sid = new byte[0];
ttl = 0;
K = null;
cIV = null;
sIV = null;
cn = null;
sn = null;
}
}
protected void resetMechanism() throws SaslException {
password = null;
M1 = null;
K = null;
cIV = null;
sIV = null;
inMac = outMac = null;
inCipher = outCipher = null;
sid = null;
ttl = 0;
cn = null;
sn = null;
}
// javax.security.sasl.SaslClient interface implementation -----------------
public boolean hasInitialResponse() {
return true;
}
public byte[] evaluateChallenge(final byte[] challenge) throws SaslException {
switch (state) {
case 0:
state++;
return sendIdentities();
case 1:
state++;
return sendPublicKey(challenge);
case 2: // should only occur if session re-use was rejected
if (!complete) {
state++;
return receiveEvidence(challenge);
}
// else fall through
default:
throw new IllegalMechanismStateException("evaluateChallenge()");
}
}
protected byte[]
engineUnwrap(final byte[] incoming, final int offset, final int len)
throws SaslException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> engineUnwrap()");
if (inMac == null && inCipher == null) {
throw new IllegalStateException("connection is not protected");
}
// at this point one, or both, of confidentiality and integrity protection
// services are active.
final byte[] result;
try {
// final InputBuffer frameIn = InputBuffer.getInstance(incoming, offset, len);
// result = frameIn.getEOS();
if (inMac != null) { // integrity bytes are at the end of the stream
final int macBytesCount = inMac.length();
final int payloadLength = len - macBytesCount;
// final byte[] received_mac = frameIn.getOS();
final byte[] received_mac = new byte[macBytesCount];
System.arraycopy(incoming, offset + payloadLength, received_mac, 0, macBytesCount);
if (DEBUG && debuglevel > 6) debug(TRACE, "Got C (received MAC): "+Util.dumpString(received_mac));
// inMac.update(result);
inMac.update(incoming, offset, payloadLength);
if (replayDetection) {
inCounter++;
if (DEBUG && debuglevel > 6) debug(TRACE, "inCounter="+String.valueOf(inCounter));
inMac.update(new byte[] {
(byte)(inCounter >>> 24),
(byte)(inCounter >>> 16),
(byte)(inCounter >>> 8),
(byte) inCounter});
}
final byte[] computed_mac = inMac.doFinal();
if (DEBUG && debuglevel > 6) debug(TRACE, "Computed MAC: "+Util.dumpString(computed_mac));
if (!Arrays.equals(received_mac, computed_mac)) {
throw new IntegrityException("engineUnwrap()");
}
// deal with the payload, which can be either plain or encrypted
if (inCipher != null) {
result = inCipher.doFinal(incoming, offset, payloadLength);
} else {
result = new byte[len - macBytesCount];
System.arraycopy(incoming, offset, result, 0, result.length);
}
} else { // no integrity protection; just confidentiality
// if (inCipher != null) {
result = inCipher.doFinal(incoming, offset, len);
// } else {
// result = new byte[len];
// System.arraycopy(incoming, offset, result, 0, len);
// }
}
// if (inCipher != null) {
// result = inCipher.doFinal(result);
// }
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new SaslException("engineUnwrap()", x);
}
if (DEBUG && debuglevel > 8) debug(TRACE, "<== engineUnwrap()");
return result;
}
protected byte[]
engineWrap(final byte[] outgoing, final int offset, final int len)
throws SaslException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> engineWrap()");
if (outMac == null && outCipher == null) {
throw new IllegalStateException("connection is not protected");
}
// at this point one, or both, of confidentiality and integrity protection
// services are active.
// byte[] data = new byte[len];
// System.arraycopy(outgoing, offset, data, 0, len);
byte[] result;
try {
// OutputBuffer frameOut = new OutputBuffer();
final ByteArrayOutputStream out = new ByteArrayOutputStream();
// Process the data
if (outCipher != null) {
// data = outCipher.doFinal(data);
result = outCipher.doFinal(outgoing, offset, len);
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding c (encrypted plaintext): "+Util.dumpString(result));
// frameOut.setEOS(data);
out.write(result);
if (outMac != null) {
outMac.update(result);
if (replayDetection) {
outCounter++;
if (DEBUG && debuglevel > 6) debug(TRACE, "outCounter="+String.valueOf(outCounter));
outMac.update(new byte[] {
(byte)(outCounter >>> 24),
(byte)(outCounter >>> 16),
(byte)(outCounter >>> 8),
(byte) outCounter });
}
final byte[] C = outMac.doFinal();
// frameOut.setOS(C);
out.write(C);
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding C (integrity checksum): "+Util.dumpString(C));
} // else confidentiality only; do nothing
} else { // no confidentiality; just integrity [+ replay detection]
// if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding p (plaintext): "+Util.dumpString(data));
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding p (plaintext): "+Util.dumpString(outgoing, offset, len));
// frameOut.setEOS(data);
out.write(outgoing, offset, len);
// if (outMac != null) {
// outMac.update(data);
outMac.update(outgoing, offset, len);
if (replayDetection) {
outCounter++;
if (DEBUG && debuglevel > 6) debug(TRACE, "outCounter="+String.valueOf(outCounter));
outMac.update(new byte[] {
(byte)(outCounter >>> 24),
(byte)(outCounter >>> 16),
(byte)(outCounter >>> 8),
(byte) outCounter });
}
final byte[] C = outMac.doFinal();
// frameOut.setOS(C);
out.write(C);
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding C (integrity checksum): "+Util.dumpString(C));
// }
}
// frameOut.setEOS(data);
//
// if (outMac != null) {
// outMac.update(data);
// if (replayDetection) {
// outCounter++;
// if (DEBUG && debuglevel > 6) debug(TRACE, "outCounter="+String.valueOf(outCounter));
// outMac.update(new byte[] {
// (byte)(outCounter >>> 24),
// (byte)(outCounter >>> 16),
// (byte)(outCounter >>> 8),
// (byte) outCounter });
// }
// byte[] C = outMac.doFinal();
// frameOut.setOS(C);
// if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding C (integrity checksum): "+Util.dumpString(C));
// }
// result = frameOut.wrap();
result = out.toByteArray();
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new SaslException("engineWrap()", x);
}
if (DEBUG && debuglevel > 8) debug(TRACE, "<== engineWrap()");
return result;
}
protected String getNegotiatedQOP() {
if (inMac != null) {
if (inCipher != null) {
return Registry.QOP_AUTH_CONF;
} else {
return Registry.QOP_AUTH_INT;
}
}
return Registry.QOP_AUTH;
}
protected String getNegotiatedStrength() {
if (inMac != null) {
if (inCipher != null) {
return Registry.STRENGTH_HIGH;
} else {
return Registry.STRENGTH_MEDIUM;
}
}
return Registry.STRENGTH_LOW;
}
protected String getNegotiatedRawSendSize() {
return String.valueOf(rawSendSize);
}
protected String getReuse() {
return Registry.REUSE_TRUE;
}
// other methods -----------------------------------------------------------
private byte[] sendIdentities() throws SaslException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> sendIdentities()");
// If necessary, prompt the client for the username and password
getUsernameAndPassword();
if (DEBUG && debuglevel > 6) debug(TRACE, "Password: \""+new String(password)+"\"");
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding U (username): \""+U+"\"");
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding I (userid): \""+authorizationID+"\"");
// if session re-use generate new 16-byte nonce
if (sid.length != 0) {
cn = new byte[16];
PRNG.nextBytes(cn);
} else {
cn = new byte[0];
}
final OutputBuffer frameOut = new OutputBuffer();
try {
frameOut.setText(U);
frameOut.setText(authorizationID);
frameOut.setEOS(sid); // session ID to re-use
frameOut.setOS(cn); // client nonce
frameOut.setEOS(channelBinding);
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new AuthenticationException("sendIdentities()", x);
}
final byte[] result = frameOut.encode();
if (DEBUG && debuglevel > 8) debug(TRACE, "<== sendIdentities()");
if (DEBUG && debuglevel > 2) debug(INFO, "C: "+Util.dumpString(result));
if (DEBUG && debuglevel > 2) debug(INFO, " U = "+U);
if (DEBUG && debuglevel > 2) debug(INFO, " I = "+authorizationID);
if (DEBUG && debuglevel > 2) debug(INFO, "sid = "+new String(sid));
if (DEBUG && debuglevel > 2) debug(INFO, " cn = "+Util.dumpString(cn));
if (DEBUG && debuglevel > 2) debug(INFO, "cCB = "+Util.dumpString(channelBinding));
return result;
}
private byte[] sendPublicKey(final byte[] input) throws SaslException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> sendPublicKey()");
if (DEBUG && debuglevel > 6) debug(TRACE, "S: "+Util.dumpString(input));
// Server sends [00], N, g, s, B, L
// or [FF], sn, sCB
final InputBuffer frameIn = new InputBuffer(input);
final int ack;
try {
ack = (int) frameIn.getScalar(1);
if (ack == 0x00) { // new session
N = frameIn.getMPI();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got N (modulus): "+Util.dump(N));
g = frameIn.getMPI();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got g (generator): "+Util.dump(g));
s = frameIn.getOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got s (salt): "+Util.dumpString(s));
B = frameIn.getMPI();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got B (server ephermeral public key): "+Util.dump(B));
L = frameIn.getText();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got L (available options): \""+L+"\"");
} else if (ack == 0xFF) { // session re-use
sn = frameIn.getOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got sn (server nonce): "+Util.dumpString(sn));
sCB = frameIn.getEOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got sCB (server channel binding): "+Util.dumpString(sCB));
} else { // unexpected scalar
throw new SaslException("sendPublicKey(): Invalid scalar ("+ack+") in server's request");
}
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new SaslException("sendPublicKey()", x);
}
if (ack == 0x00) { // new session ---------------------------------------
o = createO(L.toLowerCase()); // do this first to initialise the SRP hash
final byte[] pBytes; // use ASCII encoding to inter-operate w/ non-java
try {
pBytes = new String(password).getBytes("US-ASCII");
} catch (UnsupportedEncodingException x) {
throw new SaslException("sendPublicKey()", x);
}
// ----------------------------------------------------------------------
final HashMap mapA = new HashMap();
// mapA.put(SRP6KeyAgreement.HASH_FUNCTION, srp.newDigest());
mapA.put(SRP6KeyAgreement.HASH_FUNCTION, srp.getAlgorithm());
mapA.put(SRP6KeyAgreement.USER_IDENTITY, U);
mapA.put(SRP6KeyAgreement.USER_PASSWORD, pBytes);
try {
clientHandler.init(mapA);
clientHandler.processMessage(null);
} catch (KeyAgreementException x) {
throw new SaslException("sendPublicKey()", x);
}
// ----------------------------------------------------------------------
// -------------------------------------------------------------------
try {
OutgoingMessage out = new OutgoingMessage();
out.writeMPI(N);
out.writeMPI(g);
out.writeMPI(new BigInteger(1, s));
out.writeMPI(B);
IncomingMessage in = new IncomingMessage(out.toByteArray());
out = clientHandler.processMessage(in);
in = new IncomingMessage(out.toByteArray());
A = in.readMPI();
K = clientHandler.getSharedSecret();
} catch (KeyAgreementException x) {
throw new SaslException("sendPublicKey()", x);
}
// -------------------------------------------------------------------
if (DEBUG && debuglevel > 6) debug(TRACE, "K: "+Util.dumpString(K));
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding A (client ephemeral public key): "+Util.dump(A));
try {
M1 = srp.generateM1(
N, g, U, s, A, B, K, authorizationID, L, cn, channelBinding);
} catch (UnsupportedEncodingException x) {
throw new AuthenticationException("sendPublicKey()", x);
}
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding o (client chosen options): \""+o+"\"");
if (DEBUG && debuglevel > 6) debug(TRACE, "Encoding cIV (client IV): \""+Util.dumpString(cIV)+"\"");
final OutputBuffer frameOut = new OutputBuffer();
try {
frameOut.setMPI(A);
frameOut.setOS(M1);
frameOut.setText(o);
frameOut.setOS(cIV);
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new AuthenticationException("sendPublicKey()", x);
}
final byte[] result = frameOut.encode();
if (DEBUG && debuglevel > 8) debug(TRACE, "<== sendPublicKey()");
if (DEBUG && debuglevel > 2) debug(INFO, "New session, or session re-use rejected...");
if (DEBUG && debuglevel > 2) debug(INFO, "C: "+Util.dumpString(result));
if (DEBUG && debuglevel > 2) debug(INFO, " A = 0x"+A.toString(16));
if (DEBUG && debuglevel > 2) debug(INFO, " M1 = "+Util.dumpString(M1));
if (DEBUG && debuglevel > 2) debug(INFO, " o = "+o);
if (DEBUG && debuglevel > 2) debug(INFO, "cIV = "+Util.dumpString(cIV));
return result;
} else { // session re-use accepted -------------------------------------
setupSecurityServices(true);
if (DEBUG && debuglevel > 8) debug(TRACE, "<== sendPublicKey()");
if (DEBUG && debuglevel > 2) debug(INFO, "Session re-use accepted...");
return null;
}
}
private byte[] receiveEvidence(byte[] input) throws SaslException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> receiveEvidence()");
if (DEBUG && debuglevel > 6) debug(TRACE, "S: "+Util.dumpString(input));
// Server send M2, sIV, sCB, sid, ttl
final InputBuffer frameIn = new InputBuffer(input);
try {
M2 = frameIn.getOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got M2 (server evidence): "+Util.dumpString(M2));
sIV = frameIn.getOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got sIV (server IV): "+Util.dumpString(sIV));
sid = frameIn.getEOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got sid (session ID): "+new String(sid));
ttl = (int) frameIn.getScalar(4);
if (DEBUG && debuglevel > 6) debug(TRACE, "Got ttl (session time-to-live): "+ttl+"sec.");
sCB = frameIn.getEOS();
if (DEBUG && debuglevel > 6) debug(TRACE, "Got sCB (server channel binding): "+Util.dumpString(sCB));
} catch (IOException x) {
if (x instanceof SaslException) {
throw (SaslException) x;
}
throw new AuthenticationException("receiveEvidence()", x);
}
final byte[] expected;
try {
expected = srp.generateM2(
A, M1, K, U, authorizationID, o, sid, ttl, cIV, sIV, sCB);
} catch (UnsupportedEncodingException x) {
throw new AuthenticationException("receiveEvidence()", x);
}
if (DEBUG && debuglevel > 6) debug(TRACE, "Expected: "+Util.dumpString(expected));
if (!Arrays.equals(M2, expected)) {
throw new AuthenticationException("M2 mismatch");
}
setupSecurityServices(false);
if (DEBUG && debuglevel > 8) debug(TRACE, "<== receiveEvidence()");
return null;
}
private void getUsernameAndPassword() throws AuthenticationException {
try {
if ((!properties.containsKey(Registry.SASL_USERNAME))
&& (!properties.containsKey(Registry.SASL_PASSWORD))) {
final NameCallback nameCB;
final String defaultName = System.getProperty("user.name");
if (defaultName == null) {
nameCB = new NameCallback("username: ");
} else {
nameCB = new NameCallback("username: ",defaultName);
}
final PasswordCallback pwdCB = new PasswordCallback("password: ", false);
handler.handle(new Callback[] { nameCB, pwdCB });
U = nameCB.getName();
password = pwdCB.getPassword();
} else {
if (properties.containsKey(Registry.SASL_USERNAME)) {
this.U = (String)properties.get(Registry.SASL_USERNAME);
} else {
final NameCallback nameCB;
final String defaultName = System.getProperty("user.name");
if (defaultName == null) {
nameCB = new NameCallback("username: ");
} else {
nameCB = new NameCallback("username: ", defaultName);
}
this.handler.handle(new Callback[] { nameCB });
this.U = nameCB.getName();
}
if (properties.containsKey(Registry.SASL_PASSWORD)) {
this.password = ((String) properties.get(Registry.SASL_PASSWORD)).toCharArray();
} else {
final PasswordCallback pwdCB = new PasswordCallback("password: ", false);
this.handler.handle(new Callback[] { pwdCB });
this.password = pwdCB.getPassword();
}
}
if (U == null) {
throw new AuthenticationException("null username supplied");
}
if (password == null) {
throw new AuthenticationException("null password supplied");
}
} catch (UnsupportedCallbackException x) {
throw new AuthenticationException("getUsernameAndPassword()", x);
} catch (IOException x) {
throw new AuthenticationException("getUsernameAndPassword()", x);
}
}
// We go through the list of available services and for each available one
// we decide whether or not we want it enabled, based on properties passed
// to us by the client.
private String createO(final String aol) throws AuthenticationException {
if (DEBUG && debuglevel > 8) debug(TRACE, "==> createO(\""+aol+"\")");
boolean replaydetectionAvailable = false;
boolean integrityAvailable = false;
boolean confidentialityAvailable = false;
String option, mandatory = SRPRegistry.DEFAULT_MANDATORY;
int i;
String mdName = SRPRegistry.SRP_DEFAULT_DIGEST_NAME;
final StringTokenizer st = new StringTokenizer(aol, ",");
while (st.hasMoreTokens()) {
option = st.nextToken();
if (option.startsWith(SRPRegistry.OPTION_SRP_DIGEST + "=")) {
option = option.substring(option.indexOf('=') + 1);
if (DEBUG && debuglevel > 6) debug(TRACE, "mda: <"+option+">");
for (i = 0; i < SRPRegistry.INTEGRITY_ALGORITHMS.length; i++) {
if (SRPRegistry.SRP_ALGORITHMS[i].equals(option)) {
mdName = option;
break;
}
}
} else if (option.equals(SRPRegistry.OPTION_REPLAY_DETECTION)) {
replaydetectionAvailable = true;
} else if (option.startsWith(SRPRegistry.OPTION_INTEGRITY + "=")) {
option = option.substring(option.indexOf('=') + 1);
if (DEBUG && debuglevel > 6) debug(TRACE, "ialg: <"+option+">");
for (i = 0; i < SRPRegistry.INTEGRITY_ALGORITHMS.length; i++) {
if (SRPRegistry.INTEGRITY_ALGORITHMS[i].equals(option)) {
chosenIntegrityAlgorithm = option;
integrityAvailable = true;
break;
}
}
} else if (option.startsWith(SRPRegistry.OPTION_CONFIDENTIALITY + "=")) {
option = option.substring(option.indexOf('=') + 1);
if (DEBUG && debuglevel > 6) debug(TRACE, "calg: <"+option+">");
for (i = 0; i < SRPRegistry.CONFIDENTIALITY_ALGORITHMS.length; i++) {
if (SRPRegistry.CONFIDENTIALITY_ALGORITHMS[i].equals(option)) {
chosenConfidentialityAlgorithm = option;
confidentialityAvailable = true;
break;
}
}
} else if (option.startsWith(SRPRegistry.OPTION_MANDATORY + "=")) {
mandatory = option.substring(option.indexOf('=') + 1);
} else if (option.startsWith(SRPRegistry.OPTION_MAX_BUFFER_SIZE + "=")) {
final String maxBufferSize = option.substring(option.indexOf('=') + 1);
try {
rawSendSize = Integer.parseInt(maxBufferSize);
if (rawSendSize > Registry.SASL_BUFFER_MAX_LIMIT || rawSendSize < 1) {
throw new AuthenticationException("Illegal value for 'maxbuffersize' option");
}
} catch (NumberFormatException x) {
throw new AuthenticationException(SRPRegistry.OPTION_MAX_BUFFER_SIZE
+ "=" + String.valueOf(maxBufferSize), x);
}
}
}
replayDetection = replaydetectionAvailable && Boolean.valueOf(
(String) properties.get(SRPRegistry.SRP_REPLAY_DETECTION)).booleanValue();
boolean integrity = integrityAvailable && Boolean.valueOf(
(String) properties.get(SRPRegistry.SRP_INTEGRITY_PROTECTION)).booleanValue();
boolean confidentiality = confidentialityAvailable && Boolean.valueOf(
(String) properties.get(SRPRegistry.SRP_CONFIDENTIALITY)).booleanValue();
// make sure we do the right thing
if (SRPRegistry.OPTION_REPLAY_DETECTION.equals(mandatory)) {
replayDetection = true;
integrity = true;
} else if (SRPRegistry.OPTION_INTEGRITY.equals(mandatory)) {
integrity = true;
} else if (SRPRegistry.OPTION_CONFIDENTIALITY.equals(mandatory)) {
confidentiality = true;
}
if (replayDetection) {
if (chosenIntegrityAlgorithm == null) {
throw new AuthenticationException("Replay detection is required but no "
+"integrity protection algorithm was chosen");
}
}
if (integrity) {
if (chosenIntegrityAlgorithm == null) {
throw new AuthenticationException("Integrity protection is required but no "
+"algorithm was chosen");
}
}
if (confidentiality) {
if (chosenConfidentialityAlgorithm == null) {
throw new AuthenticationException("Confidentiality protection is required "
+"but no algorithm was chosen");
}
}
// 1. check if we'll be using confidentiality; if not set IV to 0-byte
if (chosenConfidentialityAlgorithm == null) {
cIV = new byte[0];
} else {
// 2. get the block size of the cipher
final IBlockCipher cipher =
CipherFactory.getInstance(chosenConfidentialityAlgorithm);
if (cipher == null) {
throw new AuthenticationException("createO()", new NoSuchAlgorithmException());
}
final int blockSize = cipher.defaultBlockSize();
// 3. generate random iv
cIV = new byte[blockSize];
PRNG.nextBytes(cIV);
}
srp = SRP.instance(mdName);
// Now create the options list specifying which of the available options
// we have chosen.
// For now we just select the defaults. Later we need to add support for
// properties (perhaps in a file) where a user can specify the list of
// algorithms they would prefer to use.
final StringBuffer sb = new StringBuffer();
sb.append(SRPRegistry.OPTION_SRP_DIGEST).append("=")
.append(mdName).append(",");
if (replayDetection) {
sb.append(SRPRegistry.OPTION_REPLAY_DETECTION).append(",");
}
if (integrity) {
sb.append(SRPRegistry.OPTION_INTEGRITY).append("=")
.append(chosenIntegrityAlgorithm).append(",");
}
if (confidentiality) {
sb.append(SRPRegistry.OPTION_CONFIDENTIALITY).append("=")
.append(chosenConfidentialityAlgorithm).append(",");
}
final String result = sb
.append(SRPRegistry.OPTION_MAX_BUFFER_SIZE).append("=")
.append(Registry.SASL_BUFFER_MAX_LIMIT).toString();
if (DEBUG && debuglevel > 8) debug(TRACE, "<== createO() --> "+result);
return result;
}
private void setupSecurityServices(final boolean sessionReUse)
throws SaslException {
complete = true; // signal end of authentication phase
if (!sessionReUse) {
outCounter = inCounter = 0;
// instantiate cipher if confidentiality protection filter is active
if (chosenConfidentialityAlgorithm != null) {
if (DEBUG && debuglevel > 2) debug(INFO, "Activating confidentiality protection filter");
inCipher = CALG.getInstance(chosenConfidentialityAlgorithm);
outCipher = CALG.getInstance(chosenConfidentialityAlgorithm);
}
// instantiate hmacs if integrity protection filter is active
if (chosenIntegrityAlgorithm != null) {
if (DEBUG && debuglevel > 2) debug(INFO, "Activating integrity protection filter");
inMac = IALG.getInstance(chosenIntegrityAlgorithm);
outMac = IALG.getInstance(chosenIntegrityAlgorithm);
}
} else { // same session new Keys
K = srp.generateKn(K, cn, sn);
}
final KDF kdf = KDF.getInstance(K);
// initialise in/out ciphers if confidentiality protection is used
if (inCipher != null) {
inCipher.init(kdf, sIV, Direction.REVERSED);
outCipher.init(kdf, cIV, Direction.FORWARD);
}
// initialise in/out macs if integrity protection is used
if (inMac != null) {
inMac.init(kdf);
outMac.init(kdf);
}
if (sid != null && sid.length != 0) { // update the security context and save in map
if (DEBUG && debuglevel > 2) debug(INFO, "Updating security context for UID = "+uid);
ClientStore.instance().cacheSession(uid, ttl,
new SecurityContext(srp.getAlgorithm(), sid, K, cIV, sIV,
replayDetection, inCounter, outCounter, inMac, outMac,
inCipher, outCipher));
}
}
}
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