/*
* Copyright 2010 JBoss Inc
*
* Licensed 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.drools.compiler.kie.builder.impl;
import com.google.protobuf.ByteString;
import com.google.protobuf.ExtensionRegistry;
import com.google.protobuf.Message;
import org.drools.compiler.kie.builder.impl.KieModuleCache.Header;
import org.drools.core.util.Drools;
import org.drools.core.util.KeyStoreHelper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.SignatureException;
public class KieModuleCacheHelper {
public static void writeToStreamWithHeader( OutputStream stream,
Message payload ) throws IOException {
KieModuleCache.Header.Builder _header = KieModuleCache.Header.newBuilder();
// need to automate this version numbering somehow
_header.setVersion( KieModuleCache.Version.newBuilder()
.setVersionMajor( Drools.getMajorVersion() )
.setVersionMinor( Drools.getMinorVersion() )
.setVersionRevision( Drools.getRevisionVersion() )
.build() );
byte[] buff = payload.toByteArray();
sign( _header, buff );
_header.setPayload( ByteString.copyFrom( buff ) );
stream.write( _header.build().toByteArray() );
}
private static void sign(KieModuleCache.Header.Builder _header,
byte[] buff ) {
KeyStoreHelper helper = new KeyStoreHelper();
if (helper.isSigned()) {
try {
_header.setSignature( KieModuleCache.Signature.newBuilder()
.setKeyAlias( helper.getPvtKeyAlias() )
.setSignature( ByteString.copyFrom( helper.signDataWithPrivateKey( buff ) ) )
.build() );
} catch (Exception e) {
throw new RuntimeException( "Error signing session: " + e.getMessage(),
e );
}
}
}
public static KieModuleCache.Header readFromStreamWithHeaderPreloaded( InputStream stream, ExtensionRegistry registry ) throws IOException, ClassNotFoundException {
// we preload the stream into a byte[] to overcome a message size limit
// imposed by protobuf as per https://issues.jboss.org/browse/DROOLS-25
byte[] preloaded = preload(stream);
KieModuleCache.Header _header = KieModuleCache.Header.parseFrom( preloaded, registry );
// should we check version as well here?
checkSignature( _header, _header.getPayload().toByteArray() );
return _header;
}
/* Method that preloads the source stream into a byte array to bypass the message size limitations in Protobuf unmarshalling.
(Protobuf does not enforce a message size limit when unmarshalling from a byte array)
*/
private static byte[] preload(InputStream stream) throws IOException {
byte[] buf = new byte[4096];
ByteArrayOutputStream preloaded = new ByteArrayOutputStream();
int read;
while((read = stream.read(buf)) != -1) {
preloaded.write(buf, 0, read);
}
return preloaded.toByteArray();
}
private static void checkSignature(Header _header,
byte[] sessionbuff) {
KeyStoreHelper helper = new KeyStoreHelper();
boolean signed = _header.hasSignature();
if ( helper.isSigned() != signed ) {
throw new RuntimeException( "This environment is configured to work with " +
(helper.isSigned() ? "signed" : "unsigned") +
" serialized objects, but the given object is " +
(signed ? "signed" : "unsigned") + ". Deserialization aborted." );
}
if ( signed ) {
if ( helper.getPubKeyStore() == null ) {
throw new RuntimeException( "The session was serialized with a signature. Please configure a public keystore with the public key to check the signature. Deserialization aborted." );
}
try {
if ( !helper.checkDataWithPublicKey( _header.getSignature().getKeyAlias(),
sessionbuff,
_header.getSignature().getSignature().toByteArray() ) ) {
throw new RuntimeException(
"Signature does not match serialized package. This is a security violation. Deserialisation aborted." );
}
} catch ( InvalidKeyException e ) {
throw new RuntimeException( "Invalid key checking signature: " + e.getMessage(),
e );
} catch ( KeyStoreException e ) {
throw new RuntimeException( "Error accessing Key Store: " + e.getMessage(),
e );
} catch ( NoSuchAlgorithmException e ) {
throw new RuntimeException( "No algorithm available: " + e.getMessage(),
e );
} catch ( SignatureException e ) {
throw new RuntimeException( "Signature Exception: " + e.getMessage(),
e );
}
}
}
public static ExtensionRegistry buildRegistry() {
ExtensionRegistry registry = ExtensionRegistry.newInstance();
return registry;
}
public static final byte[] intToByteArray(int value) {
return new byte[] {
(byte) ((value >>> 24) & 0xFF),
(byte) ((value >>> 16) & 0xFF),
(byte) ((value >>> 8) & 0xFF),
(byte) (value & 0xFF) };
}
public static final int byteArrayToInt(byte [] b) {
return (b[0] << 24)
+ ((b[1] & 0xFF) << 16)
+ ((b[2] & 0xFF) << 8)
+ (b[3] & 0xFF);
}
// more efficient than instantiating byte buffers and opening streams
public static final byte[] longToByteArray(long value) {
return new byte[]{
(byte) ((value >>> 56) & 0xFF),
(byte) ((value >>> 48) & 0xFF),
(byte) ((value >>> 40) & 0xFF),
(byte) ((value >>> 32) & 0xFF),
(byte) ((value >>> 24) & 0xFF),
(byte) ((value >>> 16) & 0xFF),
(byte) ((value >>> 8) & 0xFF),
(byte) (value & 0xFF)};
}
public static final long byteArrayToLong(byte[] b) {
return ((((long)b[0]) & 0xFF) << 56)
+ ((((long)b[1]) & 0xFF) << 48)
+ ((((long)b[2]) & 0xFF) << 40)
+ ((((long)b[3]) & 0xFF) << 32)
+ ((((long)b[4]) & 0xFF) << 24)
+ ((((long)b[5]) & 0xFF) << 16)
+ ((((long)b[6]) & 0xFF) << 8)
+ (((long)b[7]) & 0xFF);
}
}