certServiceClient/src/main/java/org/onap/oom/certservice/client/certification/CsrFactory.java

   1 /*============LICENSE_START=======================================================
   2  * oom-certservice-client
   3  * ================================================================================
   4  * Copyright (C) 2020 Nokia. All rights reserved.
   5  * ================================================================================
   6  * Licensed under the Apache License, Version 2.0 (the "License");
   7  * you may not use this file except in compliance with the License.
   8  * You may obtain a copy of the License at
   9  *
  10  *      http://www.apache.org/licenses/LICENSE-2.0
  11  *
  12  * Unless required by applicable law or agreed to in writing, software
  13  * distributed under the License is distributed on an "AS IS" BASIS,
  14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  15  * See the License for the specific language governing permissions and
  16  * limitations under the License.
  17  * ============LICENSE_END=========================================================
  18  */
  19
  20 package org.onap.oom.certservice.client.certification;
  21
  22 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.COMMON_NAME;
  23 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.COUNTRY;
  24 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.LOCATION;
  25 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION;
  26 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION_UNIT;
  27 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.SIGN_ALGORITHM;
  28 import static org.onap.oom.certservice.client.certification.EncryptionAlgorithmConstants.STATE;
  29
  30 import java.io.IOException;
  31 import java.io.StringWriter;
  32 import java.security.KeyPair;
  33 import java.util.List;
  34 import java.util.Optional;
  35 import java.util.stream.Collectors;
  36 import javax.security.auth.x500.X500Principal;
  37 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
  38 import org.bouncycastle.asn1.x509.Extension;
  39 import org.bouncycastle.asn1.x509.Extensions;
  40 import org.bouncycastle.asn1.x509.ExtensionsGenerator;
  41 import org.bouncycastle.asn1.x509.GeneralName;
  42 import org.bouncycastle.asn1.x509.GeneralNames;
  43 import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
  44 import org.bouncycastle.operator.ContentSigner;
  45 import org.bouncycastle.operator.OperatorCreationException;
  46 import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
  47 import org.bouncycastle.pkcs.PKCS10CertificationRequest;
  48 import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;
  49 import org.onap.oom.certservice.client.certification.exception.CsrGenerationException;
  50 import org.onap.oom.certservice.client.configuration.model.CsrConfiguration;
  51 import org.slf4j.Logger;
  52 import org.slf4j.LoggerFactory;
  53
  54
  55 public class CsrFactory {
  56
  57     private static final Logger LOGGER = LoggerFactory.getLogger(CsrFactory.class);
  58     private final CsrConfiguration configuration;
  59
  60
  61     public CsrFactory(CsrConfiguration configuration) {
  62         this.configuration = configuration;
  63     }
  64
  65
  66     public String createCsrInPem(KeyPair keyPair) throws CsrGenerationException {
  67         LOGGER.info("Creation of CSR has been started with following parameters: {}", configuration.toString());
  68         String csrParameters = getMandatoryParameters().append(getOptionalParameters()).toString();
  69         X500Principal subject = new X500Principal(csrParameters);
  70         PKCS10CertificationRequest request = createPkcs10Csr(subject, keyPair);
  71
  72         LOGGER.info("Creation of CSR has been completed successfully");
  73         return convertPkcs10CsrToPem(request);
  74     }
  75
  76     private StringBuilder getMandatoryParameters() {
  77         return new StringBuilder(String.format("%s=%s, %s=%s, %s=%s, %s=%s",
  78             COMMON_NAME, configuration.getCommonName(),
  79             COUNTRY, configuration.getCountry(),
  80             STATE, configuration.getState(),
  81             ORGANIZATION, configuration.getOrganization()));
  82     }
  83
  84     private String getOptionalParameters() {
  85         StringBuilder optionalParameters = new StringBuilder();
  86         Optional.ofNullable(configuration.getOrganizationUnit())
  87             .filter(CsrFactory::isParameterPresent)
  88             .map(unit -> optionalParameters.append(String.format(", %s=%s", ORGANIZATION_UNIT, unit)));
  89         Optional.ofNullable(configuration.getLocation())
  90             .filter(CsrFactory::isParameterPresent)
  91             .map(location -> optionalParameters.append(String.format(", %s=%s", LOCATION, location)));
  92         return optionalParameters.toString();
  93     }
  94
  95     private PKCS10CertificationRequest createPkcs10Csr(X500Principal subject, KeyPair keyPair)
  96         throws CsrGenerationException {
  97         JcaPKCS10CertificationRequestBuilder builder = new JcaPKCS10CertificationRequestBuilder(subject,
  98             keyPair.getPublic());
  99
 100         if (!configuration.getSans().isEmpty()) {
 101             builder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, generateSansExtension());
 102         }
 103
 104         return builder.build(getContentSigner(keyPair));
 105     }
 106
 107     private ContentSigner getContentSigner(KeyPair keyPair) throws CsrGenerationException {
 108         ContentSigner contentSigner;
 109         try {
 110             contentSigner = new JcaContentSignerBuilder(SIGN_ALGORITHM).build(keyPair.getPrivate());
 111         } catch (OperatorCreationException e) {
 112             LOGGER.error("Creation of PKCS10Csr failed, exception message: {}", e.getMessage());
 113             throw new CsrGenerationException(e);
 114
 115         }
 116         return contentSigner;
 117     }
 118
 119     private String convertPkcs10CsrToPem(PKCS10CertificationRequest request) throws CsrGenerationException {
 120         final StringWriter stringWriter = new StringWriter();
 121         try (JcaPEMWriter pemWriter = new JcaPEMWriter(stringWriter)) {
 122             LOGGER.info("Conversion of CSR to PEM has been started");
 123             pemWriter.writeObject(request);
 124         } catch (IOException e) {
 125             LOGGER.error("Conversion to PEM failed, exception message: {}", e.getMessage());
 126             throw new CsrGenerationException(e);
 127         }
 128         return stringWriter.toString();
 129     }
 130
 131     private Extensions generateSansExtension() throws CsrGenerationException {
 132         ExtensionsGenerator generator = new ExtensionsGenerator();
 133         try {
 134             generator.addExtension(Extension.subjectAlternativeName, false, createGeneralNames());
 135         } catch (IOException e) {
 136             LOGGER.error("Generation of SANs parameter failed, exception message: {}", e.getMessage());
 137             throw new CsrGenerationException(e);
 138         }
 139         return generator.generate();
 140     }
 141
 142     private GeneralNames createGeneralNames() {
 143         List<String> sans = this.configuration.getSans();
 144         GeneralName[] generalNames = sans.stream()
 145             .map(san -> new GeneralName(GeneralName.dNSName, san))
 146             .collect(Collectors.toList())
 147             .toArray(GeneralName[]::new);
 148         return new GeneralNames(generalNames);
 149     }
 150
 151     private static Boolean isParameterPresent(String parameter) {
 152         return parameter != null && !"".equals(parameter);
 153     }
 154 }