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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2020 Nordix Foundation.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.aaf.certservice.cmpv2client.impl;
import java.security.KeyPair;
import java.security.PublicKey;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseHelper.checkIfCmpResponseContainsError;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseHelper.getCertFromByteArray;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseHelper.verifyAndReturnCertChainAndTrustSTore;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseValidationHelper.checkImplicitConfirm;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseValidationHelper.verifyPasswordBasedProtection;
import static org.onap.aaf.certservice.cmpv2client.impl.CmpResponseValidationHelper.verifySignature;
import java.io.IOException;
import java.security.cert.CertificateParsingException;
import java.security.cert.X509Certificate;
import java.util.Collections;
import java.util.Date;
import java.util.Objects;
import java.util.Optional;
import org.apache.http.impl.client.CloseableHttpClient;
import org.bouncycastle.asn1.cmp.CMPCertificate;
import org.bouncycastle.asn1.cmp.CertRepMessage;
import org.bouncycastle.asn1.cmp.CertResponse;
import org.bouncycastle.asn1.cmp.PKIBody;
import org.bouncycastle.asn1.cmp.PKIHeader;
import org.bouncycastle.asn1.cmp.PKIMessage;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.onap.aaf.certservice.certification.configuration.model.CaMode;
import org.onap.aaf.certservice.certification.configuration.model.Cmpv2Server;
import org.onap.aaf.certservice.certification.model.CsrModel;
import org.onap.aaf.certservice.cmpv2client.exceptions.CmpClientException;
import org.onap.aaf.certservice.cmpv2client.api.CmpClient;
import org.onap.aaf.certservice.cmpv2client.model.Cmpv2CertificationModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implementation of the CmpClient Interface conforming to RFC4210 (Certificate Management Protocol
* (CMP)) and RFC4211 (Certificate Request Message Format (CRMF)) standards.
*/
public class CmpClientImpl implements CmpClient {
private static final Logger LOG = LoggerFactory.getLogger(CmpClientImpl.class);
private final CloseableHttpClient httpClient;
private static final String DEFAULT_CA_NAME = "Certification Authority";
private static final String DEFAULT_PROFILE = CaMode.RA.getProfile();
public CmpClientImpl(CloseableHttpClient httpClient) {
this.httpClient = httpClient;
}
@Override
public Cmpv2CertificationModel createCertificate(
CsrModel csrModel,
Cmpv2Server server,
Date notBefore,
Date notAfter)
throws CmpClientException {
validate(csrModel, server, httpClient, notBefore, notAfter);
KeyPair keyPair = new KeyPair(csrModel.getPublicKey(), csrModel.getPrivateKey());
final CreateCertRequest certRequest =
CmpMessageBuilder.of(CreateCertRequest::new)
.with(CreateCertRequest::setIssuerDn, server.getIssuerDN())
.with(CreateCertRequest::setSubjectDn, csrModel.getSubjectData())
.with(CreateCertRequest::setSansList, csrModel.getSans())
.with(CreateCertRequest::setSubjectKeyPair, keyPair)
.with(CreateCertRequest::setNotBefore, notBefore)
.with(CreateCertRequest::setNotAfter, notAfter)
.with(CreateCertRequest::setInitAuthPassword, server.getAuthentication().getIak())
.with(CreateCertRequest::setSenderKid, server.getAuthentication().getRv())
.build();
final PKIMessage pkiMessage = certRequest.generateCertReq();
Cmpv2HttpClient cmpv2HttpClient = new Cmpv2HttpClient(httpClient);
return retrieveCertificates(csrModel, server, pkiMessage, cmpv2HttpClient);
}
@Override
public Cmpv2CertificationModel createCertificate(CsrModel csrModel, Cmpv2Server server)
throws CmpClientException {
return createCertificate(csrModel, server, null, null);
}
private void checkCmpResponse(
final PKIMessage respPkiMessage, final PublicKey publicKey, final String initAuthPassword)
throws CmpClientException {
final PKIHeader header = respPkiMessage.getHeader();
final AlgorithmIdentifier protectionAlgo = header.getProtectionAlg();
verifySignatureWithPublicKey(respPkiMessage, publicKey);
verifyProtectionWithProtectionAlgo(respPkiMessage, initAuthPassword, header, protectionAlgo);
}
private void verifySignatureWithPublicKey(PKIMessage respPkiMessage, PublicKey publicKey)
throws CmpClientException {
if (Objects.nonNull(publicKey)) {
LOG.debug("Verifying signature of the response.");
verifySignature(respPkiMessage, publicKey);
} else {
LOG.error("Public Key is not available, therefore cannot verify signature");
throw new CmpClientException(
"Public Key is not available, therefore cannot verify signature");
}
}
private void verifyProtectionWithProtectionAlgo(
PKIMessage respPkiMessage,
String initAuthPassword,
PKIHeader header,
AlgorithmIdentifier protectionAlgo)
throws CmpClientException {
if (Objects.nonNull(protectionAlgo)) {
LOG.debug("Verifying PasswordBased Protection of the Response.");
verifyPasswordBasedProtection(respPkiMessage, initAuthPassword, protectionAlgo);
checkImplicitConfirm(header);
} else {
LOG.error(
"Protection Algorithm is not available when expecting PBE protected response containing protection algorithm");
throw new CmpClientException(
"Protection Algorithm is not available when expecting PBE protected response containing protection algorithm");
}
}
private Cmpv2CertificationModel checkCmpCertRepMessage(final PKIMessage respPkiMessage)
throws CmpClientException {
final PKIBody pkiBody = respPkiMessage.getBody();
if (Objects.nonNull(pkiBody) && pkiBody.getContent() instanceof CertRepMessage) {
final CertRepMessage certRepMessage = (CertRepMessage) pkiBody.getContent();
if (Objects.nonNull(certRepMessage)) {
final CertResponse certResponse =
getCertificateResponseContainingNewCertificate(certRepMessage);
try {
return verifyReturnCertChainAndTrustStore(respPkiMessage, certRepMessage, certResponse);
} catch (IOException | CertificateParsingException ex) {
CmpClientException cmpClientException =
new CmpClientException(
"Exception occurred while retrieving Certificates from response", ex);
LOG.error("Exception occurred while retrieving Certificates from response", ex);
throw cmpClientException;
}
} else {
return new Cmpv2CertificationModel(Collections.emptyList(), Collections.emptyList());
}
}
return new Cmpv2CertificationModel(Collections.emptyList(), Collections.emptyList());
}
private Cmpv2CertificationModel verifyReturnCertChainAndTrustStore(
PKIMessage respPkiMessage, CertRepMessage certRepMessage, CertResponse certResponse)
throws CertificateParsingException, CmpClientException, IOException {
LOG.info("Verifying certificates returned as part of CertResponse.");
final CMPCertificate cmpCertificate =
certResponse.getCertifiedKeyPair().getCertOrEncCert().getCertificate();
final Optional<X509Certificate> leafCertificate =
getCertFromByteArray(cmpCertificate.getEncoded(), X509Certificate.class);
if (leafCertificate.isPresent()) {
return verifyAndReturnCertChainAndTrustSTore(
respPkiMessage, certRepMessage, leafCertificate.get());
}
return new Cmpv2CertificationModel(Collections.emptyList(), Collections.emptyList());
}
private CertResponse getCertificateResponseContainingNewCertificate(
CertRepMessage certRepMessage) {
return certRepMessage.getResponse()[0];
}
/**
* Validate inputs for Certificate Creation.
*
* @param csrModel Certificate Signing Request model. Must not be {@code null}.
* @param server CMPv2 Server. Must not be {@code null}.
* @throws IllegalArgumentException if Before Date is set after the After Date.
*/
private static void validate(
final CsrModel csrModel,
final Cmpv2Server server,
final CloseableHttpClient httpClient,
final Date notBefore,
final Date notAfter) {
String caName = CmpUtil.isNullOrEmpty(server.getCaName()) ? server.getCaName() : DEFAULT_CA_NAME;
String profile = server.getCaMode() != null ? server.getCaMode().getProfile() : DEFAULT_PROFILE;
LOG.info(
"Validate before creating Certificate Request for CA :{} in Mode {} ", caName, profile);
CmpUtil.notNull(csrModel, "CsrModel Instance");
CmpUtil.notNull(csrModel.getSubjectData(), "Subject DN");
CmpUtil.notNull(csrModel.getPrivateKey(), "Subject private key");
CmpUtil.notNull(csrModel.getPublicKey(), "Subject public key");
CmpUtil.notNull(server.getIssuerDN(), "Issuer DN");
CmpUtil.notNull(server.getUrl(), "External CA URL");
CmpUtil.notNull(server.getAuthentication().getIak(), "IAK/RV Password");
CmpUtil.notNull(httpClient, "Closeable Http Client");
if (notBefore != null && notAfter != null && notBefore.compareTo(notAfter) > 0) {
throw new IllegalArgumentException("Before Date is set after the After Date");
}
}
private Cmpv2CertificationModel retrieveCertificates(
CsrModel csrModel, Cmpv2Server server, PKIMessage pkiMessage, Cmpv2HttpClient cmpv2HttpClient)
throws CmpClientException {
final byte[] respBytes = cmpv2HttpClient.postRequest(pkiMessage, server.getUrl(), server.getCaName());
try {
final PKIMessage respPkiMessage = PKIMessage.getInstance(respBytes);
LOG.info("Received response from Server");
checkIfCmpResponseContainsError(respPkiMessage);
checkCmpResponse(respPkiMessage, csrModel.getPublicKey(), server.getAuthentication().getIak());
return checkCmpCertRepMessage(respPkiMessage);
} catch (IllegalArgumentException iae) {
CmpClientException cmpClientException =
new CmpClientException(
"Error encountered while processing response from CA server ", iae);
LOG.error("Error encountered while processing response from CA server ", iae);
throw cmpClientException;
}
}
}
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