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/*============LICENSE_START=======================================================
* oom-certservice-client
* ================================================================================
* Copyright (C) 2020 Nokia. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.oom.certservice.client.certification;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.COMMON_NAME;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.COUNTRY;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.LOCATION;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION_UNIT;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.SIGN_ALGORITHM;
import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.STATE;
import java.io.IOException;
import java.io.StringWriter;
import java.security.KeyPair;
import java.util.List;
import java.util.Optional;
import java.util.stream.Collectors;
import javax.security.auth.x500.X500Principal;
import org.apache.commons.collections.CollectionUtils;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;
import org.onap.oom.certservice.client.certification.exception.CsrGenerationException;
import org.onap.oom.certservice.client.configuration.model.CsrConfiguration;
import org.onap.oom.certservice.client.configuration.model.San;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class CsrFactory {
private static final Logger LOGGER = LoggerFactory.getLogger(CsrFactory.class);
private final CsrConfiguration configuration;
public CsrFactory(CsrConfiguration configuration) {
this.configuration = configuration;
}
public String createCsrInPem(KeyPair keyPair) throws CsrGenerationException {
LOGGER.info("Creation of CSR has been started with following parameters: {}", configuration.toString());
String csrParameters = getMandatoryParameters().append(getOptionalParameters()).toString();
X500Principal subject = new X500Principal(csrParameters);
PKCS10CertificationRequest request = createPkcs10Csr(subject, keyPair);
LOGGER.info("Creation of CSR has been completed successfully");
return convertPkcs10CsrToPem(request);
}
private StringBuilder getMandatoryParameters() {
return new StringBuilder(String.format("%s=%s, %s=%s, %s=%s, %s=%s",
COMMON_NAME, configuration.getCommonName(),
COUNTRY, configuration.getCountry(),
STATE, configuration.getState(),
ORGANIZATION, configuration.getOrganization()));
}
private String getOptionalParameters() {
StringBuilder optionalParameters = new StringBuilder();
Optional.ofNullable(configuration.getOrganizationUnit())
.filter(CsrFactory::isParameterPresent)
.map(unit -> optionalParameters.append(String.format(", %s=%s", ORGANIZATION_UNIT, unit)));
Optional.ofNullable(configuration.getLocation())
.filter(CsrFactory::isParameterPresent)
.map(location -> optionalParameters.append(String.format(", %s=%s", LOCATION, location)));
return optionalParameters.toString();
}
private PKCS10CertificationRequest createPkcs10Csr(X500Principal subject, KeyPair keyPair)
throws CsrGenerationException {
JcaPKCS10CertificationRequestBuilder builder = new JcaPKCS10CertificationRequestBuilder(subject,
keyPair.getPublic());
if (!CollectionUtils.isEmpty(configuration.getSans())) {
builder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, generateSansExtension());
}
return builder.build(getContentSigner(keyPair));
}
private ContentSigner getContentSigner(KeyPair keyPair) throws CsrGenerationException {
ContentSigner contentSigner;
try {
contentSigner = new JcaContentSignerBuilder(SIGN_ALGORITHM).build(keyPair.getPrivate());
} catch (OperatorCreationException e) {
LOGGER.error("Creation of PKCS10Csr failed, exception message: {}", e.getMessage());
throw new CsrGenerationException(e);
}
return contentSigner;
}
private String convertPkcs10CsrToPem(PKCS10CertificationRequest request) throws CsrGenerationException {
final StringWriter stringWriter = new StringWriter();
try (JcaPEMWriter pemWriter = new JcaPEMWriter(stringWriter)) {
LOGGER.info("Conversion of CSR to PEM has been started");
pemWriter.writeObject(request);
} catch (IOException e) {
LOGGER.error("Conversion to PEM failed, exception message: {}", e.getMessage());
throw new CsrGenerationException(e);
}
return stringWriter.toString();
}
private Extensions generateSansExtension() throws CsrGenerationException {
ExtensionsGenerator generator = new ExtensionsGenerator();
try {
generator.addExtension(Extension.subjectAlternativeName, false, createGeneralNames());
} catch (IOException e) {
LOGGER.error("Generation of SANs parameter failed, exception message: {}", e.getMessage());
throw new CsrGenerationException(e);
}
return generator.generate();
}
private GeneralNames createGeneralNames() {
List<San> sans = this.configuration.getSans();
GeneralName[] generalNames = sans.stream()
.map(san -> new GeneralName(san.getType(), san.getValue()))
.collect(Collectors.toList())
.toArray(GeneralName[]::new);
return new GeneralNames(generalNames);
}
private static Boolean isParameterPresent(String parameter) {
return parameter != null && !"".equals(parameter);
}
}
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