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

   1 /*============LICENSE_START=======================================================
   2  * aaf-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.aaf.certservice.client.certification;
  21
  22 import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
  23 import org.bouncycastle.asn1.x509.Extension;
  24 import org.bouncycastle.asn1.x509.Extensions;
  25 import org.bouncycastle.asn1.x509.ExtensionsGenerator;
  26 import org.bouncycastle.asn1.x509.GeneralName;
  27 import org.bouncycastle.asn1.x509.GeneralNames;
  28 import org.bouncycastle.openssl.jcajce.JcaPEMWriter;
  29 import org.bouncycastle.operator.ContentSigner;
  30 import org.bouncycastle.operator.OperatorCreationException;
  31 import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
  32 import org.bouncycastle.pkcs.PKCS10CertificationRequest;
  33 import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;
  34
  35 import org.onap.aaf.certservice.client.certification.exception.CsrGenerationException;
  36 import org.onap.aaf.certservice.client.configuration.model.CsrConfiguration;
  37 import org.slf4j.Logger;
  38 import org.slf4j.LoggerFactory;
  39
  40 import javax.security.auth.x500.X500Principal;
  41 import java.io.IOException;
  42 import java.io.StringWriter;
  43 import java.security.KeyPair;
  44 import java.util.Optional;
  45
  46 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.COMMON_NAME;
  47 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.COUNTRY;
  48 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.LOCATION;
  49 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION;
  50 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.ORGANIZATION_UNIT;
  51 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.SIGN_ALGORITHM;
  52 import static org.onap.aaf.certservice.client.certification.EncryptionAlgorithmConstants.STATE;
  53
  54
  55 public class CsrFactory {
  56
  57     private static final Logger LOGGER = LoggerFactory.getLogger(CsrFactory.class);
  58     private static final String SANS_DELIMITER = ":";
  59     private final CsrConfiguration configuration;
  60
  61
  62     public CsrFactory(CsrConfiguration configuration) {
  63         this.configuration = configuration;
  64     }
  65
  66
  67     public String createCsrInPem(KeyPair keyPair) throws CsrGenerationException {
  68         LOGGER.info("Creation of CSR has been started with following parameters: {}", configuration.toString());
  69         String csrParameters = getMandatoryParameters().append(getOptionalParameters()).toString();
  70         X500Principal subject = new X500Principal(csrParameters);
  71         PKCS10CertificationRequest request = createPKCS10Csr(subject, keyPair);
  72
  73         LOGGER.info("Creation of CSR has been completed successfully");
  74         return convertPKCS10CsrToPem(request);
  75     }
  76
  77     private StringBuilder getMandatoryParameters() {
  78         return new StringBuilder(String.format("%s=%s, %s=%s, %s=%s, %s=%s",
  79                 COMMON_NAME, configuration.getCommonName(),
  80                 COUNTRY, configuration.getCountry(),
  81                 STATE, configuration.getState(),
  82                 ORGANIZATION, configuration.getOrganization()));
  83     }
  84
  85     private String getOptionalParameters() {
  86         StringBuilder optionalParameters = new StringBuilder();
  87         Optional.ofNullable(configuration.getOrganizationUnit())
  88                 .filter(CsrFactory::isParameterPresent)
  89                 .map(unit -> optionalParameters.append(String.format(", %s=%s", ORGANIZATION_UNIT, unit)));
  90         Optional.ofNullable(configuration.getLocation())
  91                 .filter(CsrFactory::isParameterPresent)
  92                 .map(location -> optionalParameters.append(String.format(", %s=%s", LOCATION, location)));
  93         return optionalParameters.toString();
  94     }
  95
  96     private PKCS10CertificationRequest createPKCS10Csr(X500Principal subject, KeyPair keyPair) throws CsrGenerationException {
  97         JcaPKCS10CertificationRequestBuilder builder = new JcaPKCS10CertificationRequestBuilder(subject, keyPair.getPublic());
  98
  99         if (isParameterPresent(configuration.getSans())) {
 100             builder.addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, generateSansExtension());
 101         }
 102
 103         return builder.build(getContentSigner(keyPair));
 104     }
 105
 106     private ContentSigner getContentSigner(KeyPair keyPair) throws CsrGenerationException {
 107         ContentSigner contentSigner;
 108         try {
 109             contentSigner = new JcaContentSignerBuilder(SIGN_ALGORITHM).build(keyPair.getPrivate());
 110         } catch (OperatorCreationException e) {
 111             LOGGER.error("Creation of PKCS10Csr failed, exception message: {}", e.getMessage());
 112             throw new CsrGenerationException(e);
 113
 114         }
 115         return contentSigner;
 116     }
 117
 118     private String convertPKCS10CsrToPem(PKCS10CertificationRequest request) throws CsrGenerationException {
 119         final StringWriter stringWriter = new StringWriter();
 120         try (JcaPEMWriter pemWriter = new JcaPEMWriter(stringWriter)) {
 121             LOGGER.info("Conversion of CSR to PEM has been started");
 122             pemWriter.writeObject(request);
 123         } catch (IOException e) {
 124             LOGGER.error("Conversion to PEM failed, exception message: {}", e.getMessage());
 125             throw new CsrGenerationException(e);
 126         }
 127         return stringWriter.toString();
 128     }
 129
 130     private Extensions generateSansExtension() throws CsrGenerationException {
 131         ExtensionsGenerator generator = new ExtensionsGenerator();
 132         try {
 133             generator.addExtension(Extension.subjectAlternativeName, false, createGeneralNames());
 134         } catch (IOException e) {
 135             LOGGER.error("Generation of SANs parameter failed, exception message: {}", e.getMessage());
 136             throw new CsrGenerationException(e);
 137         }
 138         return generator.generate();
 139     }
 140
 141     private GeneralNames createGeneralNames() {
 142         String[] sansTable = this.configuration.getSans().split(SANS_DELIMITER);
 143         int length = sansTable.length;
 144         GeneralName[] generalNames = new GeneralName[length];
 145         for (int i = 0; i < length; i++) {
 146             generalNames[i] = new GeneralName(GeneralName.dNSName, sansTable[i]);
 147         }
 148         return new GeneralNames(generalNames);
 149     }
 150
 151     private static Boolean isParameterPresent(String parameter) {
 152         return parameter != null && !"".equals(parameter);
 153     }
 154 }