/**
* 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.hadoop.gateway.securequery;
import org.apache.commons.codec.binary.Base64;
import org.apache.hadoop.gateway.filter.rewrite.api.UrlRewriteEnvironment;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteContext;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteStepProcessor;
import org.apache.hadoop.gateway.filter.rewrite.spi.UrlRewriteStepStatus;
import org.apache.hadoop.gateway.services.GatewayServices;
import org.apache.hadoop.gateway.services.security.CryptoService;
import org.apache.hadoop.gateway.services.security.EncryptionResult;
import org.apache.hadoop.gateway.util.urltemplate.Builder;
import org.apache.hadoop.gateway.util.urltemplate.Query;
import org.apache.hadoop.gateway.util.urltemplate.Template;
import java.io.UnsupportedEncodingException;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
public class SecureQueryDecryptProcessor implements UrlRewriteStepProcessor<SecureQueryDecryptDescriptor> {
private static final String ENCRYPTED_PARAMETER_NAME = "_";
private String clusterName;
private CryptoService cryptoService;
@Override
public String getType() {
return SecureQueryDecryptDescriptor.STEP_NAME;
}
@Override
public void initialize( UrlRewriteEnvironment environment, SecureQueryDecryptDescriptor descriptor ) throws Exception {
clusterName = environment.getAttribute( GatewayServices.GATEWAY_CLUSTER_ATTRIBUTE );
GatewayServices services = environment.getAttribute(GatewayServices.GATEWAY_SERVICES_ATTRIBUTE);
cryptoService = (CryptoService) services.getService(GatewayServices.CRYPTO_SERVICE);
}
@Override
public UrlRewriteStepStatus process( UrlRewriteContext context ) throws Exception {
//TODO: Need some way to get a reference to the keystore service and the encryption key in particular.
Template currUrl = context.getCurrentUrl();
Builder newUrl = new Builder( currUrl );
Map<String,Query> map = newUrl.getQuery();
Query query = map.remove( ENCRYPTED_PARAMETER_NAME );
if( query != null ) {
String value = query.getFirstValue().getPattern();
value = decode( value );
StringTokenizer outerParser = new StringTokenizer( value, "&" );
while( outerParser.hasMoreTokens() ) {
String pair = outerParser.nextToken();
StringTokenizer innerParser = new StringTokenizer( pair, "=" );
if( innerParser.hasMoreTokens() ) {
String paramName = innerParser.nextToken();
if( innerParser.hasMoreTokens() ) {
String paramValue = innerParser.nextToken();
// Need to remove from the clear parameters any param name in the encoded params.
// If we don't then someone could override something in the encoded param.
map.remove( paramName );
newUrl.addQuery( paramName, "", paramValue );
} else {
newUrl.addQuery( paramName, "", null );
}
}
}
context.setCurrentUrl( newUrl.build() );
context.getParameters().resolve( "gateway.name" );
}
return UrlRewriteStepStatus.SUCCESS;
}
@Override
public void destroy() {
}
private String decode( String string ) throws UnsupportedEncodingException {
byte[] bytes = Base64.decodeBase64( string );
EncryptionResult result = EncryptionResult.fromByteArray(bytes);
byte[] clear = cryptoService.decryptForCluster(clusterName,
"encryptQueryString",
result.cipher,
result.iv,
result.salt);
if (clear != null) {
return new String(clear);
}
return null;
}
}