/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at
* trunk/nasutekds/resource/legal-notices/NasuTekDS.LICENSE
* or https://NasuTekDS.dev.java.net/NasuTekDS.LICENSE.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at
* trunk/nasutekds/resource/legal-notices/NasuTekDS.LICENSE. If applicable,
* add the following below this CDDL HEADER, with the fields enclosed
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* Copyright 2006-2009 Sun Microsystems, Inc.
*/
package org.nasutekds.server.extensions;
import org.nasutekds.messages.Message;
import java.security.cert.Certificate;
import java.util.ArrayList;
import java.util.List;
import org.nasutekds.server.admin.server.ConfigurationChangeListener;
import org.nasutekds.server.admin.std.server.ExternalSASLMechanismHandlerCfg;
import org.nasutekds.server.admin.std.server.SASLMechanismHandlerCfg;
import org.nasutekds.server.api.CertificateMapper;
import org.nasutekds.server.api.ClientConnection;
import org.nasutekds.server.api.SASLMechanismHandler;
import org.nasutekds.server.config.ConfigException;
import org.nasutekds.server.core.BindOperation;
import org.nasutekds.server.core.DirectoryServer;
import static org.nasutekds.server.config.ConfigConstants.*;
import static org.nasutekds.server.loggers.debug.DebugLogger.*;
import org.nasutekds.server.loggers.debug.DebugTracer;
import org.nasutekds.server.protocols.ldap.LDAPClientConnection;
import org.nasutekds.server.types.*;
import static org.nasutekds.messages.ExtensionMessages.*;
import static org.nasutekds.server.util.ServerConstants.*;
import static org.nasutekds.server.util.StaticUtils.*;
/**
* This class provides an implementation of a SASL mechanism that relies on some
* form of authentication that has already been done outside the LDAP layer. At
* the present time, this implementation only provides support for SSL-based
* clients that presented their own certificate to the Directory Server during
* the negotiation process. Future implementations may be updated to look in
* other places to find and evaluate this external authentication information.
*/
public class ExternalSASLMechanismHandler
extends SASLMechanismHandler<ExternalSASLMechanismHandlerCfg>
implements ConfigurationChangeListener<
ExternalSASLMechanismHandlerCfg>
{
/**
* The tracer object for the debug logger.
*/
private static final DebugTracer TRACER = getTracer();
// The attribute type that should hold the certificates to use for the
// validation.
private AttributeType certificateAttributeType;
// Indicates whether to attempt to validate the certificate presented by the
// client with a certificate in the user's entry.
private CertificateValidationPolicy validationPolicy;
// The current configuration for this SASL mechanism handler.
private ExternalSASLMechanismHandlerCfg currentConfig;
/**
* Creates a new instance of this SASL mechanism handler. No initialization
* should be done in this method, as it should all be performed in the
* <CODE>initializeSASLMechanismHandler</CODE> method.
*/
public ExternalSASLMechanismHandler()
{
super();
}
/**
* {@inheritDoc}
*/
@Override()
public void initializeSASLMechanismHandler(
ExternalSASLMechanismHandlerCfg configuration)
throws ConfigException, InitializationException
{
configuration.addExternalChangeListener(this);
currentConfig = configuration;
// See if we should attempt to validate client certificates against those in
// the corresponding user's entry.
switch (configuration.getCertificateValidationPolicy())
{
case NEVER:
validationPolicy = CertificateValidationPolicy.NEVER;
break;
case IFPRESENT:
validationPolicy = CertificateValidationPolicy.IFPRESENT;
break;
case ALWAYS:
validationPolicy = CertificateValidationPolicy.ALWAYS;
break;
}
// Get the attribute type to use for validating the certificates. If none
// is provided, then default to the userCertificate type.
certificateAttributeType = configuration.getCertificateAttribute();
if (certificateAttributeType == null)
{
certificateAttributeType =
DirectoryServer.getAttributeType(DEFAULT_VALIDATION_CERT_ATTRIBUTE,
true);
}
DirectoryServer.registerSASLMechanismHandler(SASL_MECHANISM_EXTERNAL, this);
}
/**
* {@inheritDoc}
*/
@Override()
public void finalizeSASLMechanismHandler()
{
currentConfig.removeExternalChangeListener(this);
DirectoryServer.deregisterSASLMechanismHandler(SASL_MECHANISM_EXTERNAL);
}
/**
* {@inheritDoc}
*/
@Override()
public void processSASLBind(BindOperation bindOperation)
{
ExternalSASLMechanismHandlerCfg config = currentConfig;
AttributeType certificateAttributeType = this.certificateAttributeType;
CertificateValidationPolicy validationPolicy = this.validationPolicy;
// Get the client connection used for the bind request, and get the
// security manager for that connection. If either are null, then fail.
ClientConnection clientConnection = bindOperation.getClientConnection();
if (clientConnection == null) {
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_NO_CLIENT_CONNECTION.get();
bindOperation.setAuthFailureReason(message);
return;
}
if(!(clientConnection instanceof LDAPClientConnection)) {
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_NOT_LDAP_CLIENT_INSTANCE.get();
bindOperation.setAuthFailureReason(message);
return;
}
LDAPClientConnection lc = (LDAPClientConnection) clientConnection;
Certificate[] clientCertChain = lc.getClientCertificateChain();
if ((clientCertChain == null) || (clientCertChain.length == 0)) {
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_NO_CLIENT_CERT.get();
bindOperation.setAuthFailureReason(message);
return;
}
// Get the certificate mapper to use to map the certificate to a user entry.
DN certificateMapperDN = config.getCertificateMapperDN();
CertificateMapper<?> certificateMapper =
DirectoryServer.getCertificateMapper(certificateMapperDN);
// Use the Directory Server certificate mapper to map the client certificate
// chain to a single user DN.
Entry userEntry;
try
{
userEntry = certificateMapper.mapCertificateToUser(clientCertChain);
}
catch (DirectoryException de)
{
if (debugEnabled())
{
TRACER.debugCaught(DebugLogLevel.ERROR, de);
}
bindOperation.setResponseData(de);
return;
}
// If the user DN is null, then we couldn't establish a mapping and
// therefore the authentication failed.
if (userEntry == null)
{
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_NO_MAPPING.get();
bindOperation.setAuthFailureReason(message);
return;
}
else
{
bindOperation.setSASLAuthUserEntry(userEntry);
}
// Get the userCertificate attribute from the user's entry for use in the
// validation process.
List<Attribute> certAttrList =
userEntry.getAttribute(certificateAttributeType);
switch (validationPolicy)
{
case ALWAYS:
if (certAttrList == null)
{
if (validationPolicy == CertificateValidationPolicy.ALWAYS)
{
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_NO_CERT_IN_ENTRY.get(
String.valueOf(userEntry.getDN()));
bindOperation.setAuthFailureReason(message);
return;
}
}
else
{
try
{
byte[] certBytes = clientCertChain[0].getEncoded();
AttributeValue v =
AttributeValues.create(
certificateAttributeType, ByteString.wrap(certBytes));
boolean found = false;
for (Attribute a : certAttrList)
{
if (a.contains(v))
{
found = true;
break;
}
}
if (! found)
{
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_PEER_CERT_NOT_FOUND.get(
String.valueOf(userEntry.getDN()));
bindOperation.setAuthFailureReason(message);
return;
}
}
catch (Exception e)
{
if (debugEnabled())
{
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_CANNOT_VALIDATE_CERT.get(
String.valueOf(userEntry.getDN()),
getExceptionMessage(e));
bindOperation.setAuthFailureReason(message);
return;
}
}
break;
case IFPRESENT:
if (certAttrList != null)
{
try
{
byte[] certBytes = clientCertChain[0].getEncoded();
AttributeValue v =
AttributeValues.create(
certificateAttributeType, ByteString.wrap(certBytes));
boolean found = false;
for (Attribute a : certAttrList)
{
if (a.contains(v))
{
found = true;
break;
}
}
if (! found)
{
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_PEER_CERT_NOT_FOUND.get(
String.valueOf(userEntry.getDN()));
bindOperation.setAuthFailureReason(message);
return;
}
}
catch (Exception e)
{
if (debugEnabled())
{
TRACER.debugCaught(DebugLogLevel.ERROR, e);
}
bindOperation.setResultCode(ResultCode.INVALID_CREDENTIALS);
Message message = ERR_SASLEXTERNAL_CANNOT_VALIDATE_CERT.get(
String.valueOf(userEntry.getDN()),
getExceptionMessage(e));
bindOperation.setAuthFailureReason(message);
return;
}
}
}
AuthenticationInfo authInfo =
new AuthenticationInfo(userEntry, SASL_MECHANISM_EXTERNAL,
bindOperation.getSASLCredentials(),
DirectoryServer.isRootDN(userEntry.getDN()));
bindOperation.setAuthenticationInfo(authInfo);
bindOperation.setResultCode(ResultCode.SUCCESS);
}
/**
* {@inheritDoc}
*/
@Override()
public boolean isPasswordBased(String mechanism)
{
// This is not a password-based mechanism.
return false;
}
/**
* {@inheritDoc}
*/
@Override()
public boolean isSecure(String mechanism)
{
// This may be considered a secure mechanism.
return true;
}
/**
* {@inheritDoc}
*/
@Override()
public boolean isConfigurationAcceptable(
SASLMechanismHandlerCfg configuration,
List<Message> unacceptableReasons)
{
ExternalSASLMechanismHandlerCfg config =
(ExternalSASLMechanismHandlerCfg) configuration;
return isConfigurationChangeAcceptable(config, unacceptableReasons);
}
/**
* {@inheritDoc}
*/
public boolean isConfigurationChangeAcceptable(
ExternalSASLMechanismHandlerCfg configuration,
List<Message> unacceptableReasons)
{
return true;
}
/**
* {@inheritDoc}
*/
public ConfigChangeResult applyConfigurationChange(
ExternalSASLMechanismHandlerCfg configuration)
{
ResultCode resultCode = ResultCode.SUCCESS;
boolean adminActionRequired = false;
ArrayList<Message> messages = new ArrayList<Message>();
// See if we should attempt to validate client certificates against those in
// the corresponding user's entry.
CertificateValidationPolicy newValidationPolicy =
CertificateValidationPolicy.ALWAYS;
switch (configuration.getCertificateValidationPolicy())
{
case NEVER:
newValidationPolicy = CertificateValidationPolicy.NEVER;
break;
case IFPRESENT:
newValidationPolicy = CertificateValidationPolicy.IFPRESENT;
break;
case ALWAYS:
newValidationPolicy = CertificateValidationPolicy.ALWAYS;
break;
}
// Get the attribute type to use for validating the certificates. If none
// is provided, then default to the userCertificate type.
AttributeType newCertificateType = configuration.getCertificateAttribute();
if (newCertificateType == null)
{
newCertificateType =
DirectoryServer.getAttributeType(DEFAULT_VALIDATION_CERT_ATTRIBUTE,
true);
}
if (resultCode == ResultCode.SUCCESS)
{
validationPolicy = newValidationPolicy;
certificateAttributeType = newCertificateType;
currentConfig = configuration;
}
return new ConfigChangeResult(resultCode, adminActionRequired, messages);
}
}