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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.qpid.server.security.auth.manager;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.Principal;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.security.sasl.SaslException;
import javax.security.sasl.SaslServer;
import javax.xml.bind.DatatypeConverter;
import org.apache.qpid.server.model.Broker;
import org.apache.qpid.server.model.PasswordCredentialManagingAuthenticationProvider;
import org.apache.qpid.server.security.auth.AuthenticationResult;
import org.apache.qpid.server.security.auth.UsernamePrincipal;
import org.apache.qpid.server.security.auth.sasl.plain.PlainAdapterSaslServer;
import org.apache.qpid.server.security.auth.sasl.scram.ScramSaslServer;
public abstract class AbstractScramAuthenticationManager<X extends AbstractScramAuthenticationManager<X>>
extends ConfigModelPasswordManagingAuthenticationProvider<X>
implements PasswordCredentialManagingAuthenticationProvider<X>
{
public static final String PLAIN = "PLAIN";
private final SecureRandom _random = new SecureRandom();
private int _iterationCount = 4096;
protected AbstractScramAuthenticationManager(final Map<String, Object> attributes, final Broker broker)
{
super(attributes, broker);
}
@Override
public List<String> getMechanisms()
{
return Collections.unmodifiableList(Arrays.asList(getMechanismName(), PLAIN));
}
protected abstract String getMechanismName();
@Override
public SaslServer createSaslServer(final String mechanism,
final String localFQDN,
final Principal externalPrincipal)
throws SaslException
{
if(getMechanismName().equals(mechanism))
{
return new ScramSaslServer(this, getMechanismName(), getHmacName(), getDigestName());
}
else if(PLAIN.equals(mechanism))
{
return new PlainAdapterSaslServer(this);
}
else
{
throw new SaslException("Unknown mechanism: " + mechanism);
}
}
protected abstract String getDigestName();
@Override
public AuthenticationResult authenticate(final String username, final String password)
{
ManagedUser user = getUser(username);
if(user != null)
{
final String[] usernamePassword = user.getPassword().split(",");
byte[] salt = DatatypeConverter.parseBase64Binary(usernamePassword[0]);
try
{
if(Arrays.equals(DatatypeConverter.parseBase64Binary(usernamePassword[1]),
createSaltedPassword(salt, password)))
{
return new AuthenticationResult(new UsernamePrincipal(username));
}
}
catch (IllegalArgumentException e)
{
return new AuthenticationResult(AuthenticationResult.AuthenticationStatus.ERROR,e);
}
}
return new AuthenticationResult(AuthenticationResult.AuthenticationStatus.ERROR);
}
public int getIterationCount()
{
return _iterationCount;
}
public byte[] getSalt(final String username)
{
ManagedUser user = getUser(username);
if(user == null)
{
// don't disclose that the user doesn't exist, just generate random data so the failure is indistinguishable
// from the "wrong password" case
byte[] salt = new byte[32];
_random.nextBytes(salt);
return salt;
}
else
{
return DatatypeConverter.parseBase64Binary(user.getPassword().split(",")[0]);
}
}
private static final byte[] INT_1 = new byte[]{0, 0, 0, 1};
public byte[] getSaltedPassword(final String username) throws SaslException
{
ManagedUser user = getUser(username);
if(user == null)
{
throw new SaslException("Authentication Failed");
}
else
{
return DatatypeConverter.parseBase64Binary(user.getPassword().split(",")[1]);
}
}
private byte[] createSaltedPassword(byte[] salt, String password)
{
Mac mac = createShaHmac(password.getBytes(ASCII));
mac.update(salt);
mac.update(INT_1);
byte[] result = mac.doFinal();
byte[] previous = null;
for(int i = 1; i < getIterationCount(); i++)
{
mac.update(previous != null? previous: result);
previous = mac.doFinal();
for(int x = 0; x < result.length; x++)
{
result[x] ^= previous[x];
}
}
return result;
}
private Mac createShaHmac(final byte[] keyBytes)
{
try
{
SecretKeySpec key = new SecretKeySpec(keyBytes, getHmacName());
Mac mac = Mac.getInstance(getHmacName());
mac.init(key);
return mac;
}
catch (NoSuchAlgorithmException | InvalidKeyException e)
{
throw new IllegalArgumentException(e.getMessage(), e);
}
}
protected abstract String getHmacName();
@Override
protected String createStoredPassword(final String password)
{
byte[] salt = new byte[32];
_random.nextBytes(salt);
byte[] passwordBytes = createSaltedPassword(salt, password);
return DatatypeConverter.printBase64Binary(salt) + "," + DatatypeConverter.printBase64Binary(passwordBytes);
}
@Override
void validateUser(final ManagedUser managedUser)
{
if(!ASCII.newEncoder().canEncode(managedUser.getName()))
{
throw new IllegalArgumentException("User names are restricted to characters in the ASCII charset");
}
}
}
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