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/*
* Copyright 2019
* <p>
* 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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.onap.cvc.csar.security;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignerDigestMismatchException;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.util.Store;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.util.Collection;
import java.util.Optional;
public class CmsSignatureValidator {
private static final Logger LOG = LoggerFactory.getLogger(CmsSignatureValidator.class);
public boolean verifySignedData(
final byte[] cmsSignature,
final Optional<byte[]> certificate,
final byte[] fileContent) throws CmsSignatureValidatorException {
try (ByteArrayInputStream cmsSignatureStream = new ByteArrayInputStream(cmsSignature)) {
CMSSignedData signedData = getCMSSignedData(fileContent, cmsSignatureStream);
Collection<SignerInformation> signers = signedData.getSignerInfos().getSigners();
SignerInformation firstSigner = signers.iterator().next();
Store<X509CertificateHolder> certificates = signedData.getCertificates();
Collection<X509CertificateHolder> firstSignerCertificates = certificates.getMatches(firstSigner.getSID());
X509Certificate cert;
if (!firstSignerCertificates.isEmpty()) {
X509CertificateHolder firstSignerFirstCertificate = getX509CertificateHolder(firstSignerCertificates);
cert = loadCertificate(firstSignerFirstCertificate.getEncoded());
} else {
cert = loadCertificate(certificate.orElseThrow(() -> new CmsSignatureValidatorException("No certificate found in cms signature and ETSI-Entry-Certificate doesn't exist")));
}
return firstSigner.verify(new JcaSimpleSignerInfoVerifierBuilder().build(cert));
} catch (CMSSignerDigestMismatchException e){
//message-digest attribute value does not match calculated value
LOG.warn("CMS signer digest mismatch.", e);
return false;
}
catch (OperatorCreationException | IOException | CMSException e) {
throw new CmsSignatureValidatorException("Unexpected error occurred during signature validation!", e);
}
}
private X509CertificateHolder getX509CertificateHolder(Collection<X509CertificateHolder> firstSignerCertificates) throws CmsSignatureValidatorException {
if(!firstSignerCertificates.iterator().hasNext()){
throw new CmsSignatureValidatorException("No certificate found in cms signature that should contain one!");
}
return firstSignerCertificates.iterator().next();
}
private CMSSignedData getCMSSignedData(byte[] innerPackageFileCSAR, ByteArrayInputStream signatureStream) throws IOException, CmsSignatureValidatorException, CMSException {
ContentInfo signature = produceSignature(signatureStream);
CMSTypedData signedContent = new CMSProcessableByteArray(innerPackageFileCSAR);
return new CMSSignedData(signedContent, signature);
}
private ContentInfo produceSignature(ByteArrayInputStream signatureStream) throws IOException, CmsSignatureValidatorException {
Object parsedObject = new PEMParser(new InputStreamReader(signatureStream, Charset.defaultCharset())).readObject();
if (!(parsedObject instanceof ContentInfo)) {
throw new CmsSignatureValidatorException("Signature is not recognized!");
}
return ContentInfo.getInstance(parsedObject);
}
private X509Certificate loadCertificate(byte[] certFile) throws CmsSignatureValidatorException {
try (InputStream in = new ByteArrayInputStream(certFile)) {
CertificateFactory factory = CertificateFactory.getInstance("X.509");
return (X509Certificate) factory.generateCertificate(in);
} catch (CertificateException | IOException e) {
throw new CmsSignatureValidatorException("Error during loading Certificate from bytes!", e);
}
}
}
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