| /** |
| * 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.camel.component.crypto.processor; |
| |
| import java.security.PublicKey; |
| import java.security.Signature; |
| import java.security.SignatureException; |
| import java.security.cert.Certificate; |
| |
| import org.apache.camel.Exchange; |
| import org.apache.camel.component.crypto.DigitalSignatureConfiguration; |
| import org.apache.camel.util.ExchangeHelper; |
| import org.apache.commons.codec.binary.Base64; |
| |
| import static org.apache.camel.component.crypto.DigitalSignatureConstants.SIGNATURE_PUBLIC_KEY_OR_CERT; |
| |
| /** |
| * <code>VerifyingProcessor</code> |
| */ |
| public class VerifyingProcessor extends DigitalSignatureProcessor { |
| |
| public VerifyingProcessor(DigitalSignatureConfiguration configuration) { |
| super(configuration); |
| } |
| |
| public void process(Exchange exchange) throws Exception { |
| Signature signer = createSignatureService(); |
| Certificate cert = getCertificate(exchange); |
| if (cert == null) { |
| PublicKey pk = getPublicKeyOrCertificateFromHeader(exchange, PublicKey.class, config.getPublicKey()); |
| if (pk == null) { |
| throw new IllegalStateException(String.format("Cannot verify signature as no Public Key or Certificate has been supplied." |
| + " Either supply one in the route definition or via the message header '%s'", SIGNATURE_PUBLIC_KEY_OR_CERT)); |
| } |
| signer.initVerify(pk); |
| } else { |
| signer.initVerify(cert); |
| } |
| |
| calculateSignature(exchange, signer); |
| |
| byte[] signature = getSignatureFromExchange(exchange); |
| if (!signer.verify(signature)) { |
| throw new SignatureException("Cannot verify signature of exchange"); |
| } |
| clearMessageHeaders(exchange.getIn()); |
| } |
| |
| private byte[] getSignatureFromExchange(Exchange exchange) throws Exception { |
| String encodedSignature = ExchangeHelper.getMandatoryHeader(exchange, config.getSignatureHeader(), String.class); |
| if (encodedSignature == null) { |
| throw new IllegalStateException("Cannot verify exchange as no " + config.getSignatureHeader() + " header is present."); |
| } |
| return new Base64().decode(encodedSignature); |
| } |
| |
| private Certificate getCertificate(Exchange exchange) throws Exception { |
| Certificate cert = config.getCertificate(getAlias(exchange)); |
| return getPublicKeyOrCertificateFromHeader(exchange, Certificate.class, cert); |
| } |
| |
| private <T> T getPublicKeyOrCertificateFromHeader(Exchange exchange, Class<? extends T> verificationType, T defaultsTo) { |
| T pkOrCert = exchange.getIn().getHeader(SIGNATURE_PUBLIC_KEY_OR_CERT, verificationType); |
| if (pkOrCert == null) { |
| pkOrCert = defaultsTo; |
| } |
| return pkOrCert; |
| } |
| |
| } |