dmaap-adaptor-java/src/main/java/org/oran/dmaapadapter/clients/AsyncRestClientFactory.java

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * O-RAN-SC
   4  * %%
   5  * Copyright (C) 2021 Nordix Foundation
   6  * %%
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ========================LICENSE_END===================================
  19  */
  20
  21 package org.oran.dmaapadapter.clients;
  22
  23 import io.netty.handler.ssl.SslContext;
  24 import io.netty.handler.ssl.SslContextBuilder;
  25 import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
  26
  27 import java.io.FileInputStream;
  28 import java.io.IOException;
  29 import java.io.InputStream;
  30 import java.lang.invoke.MethodHandles;
  31 import java.security.KeyStore;
  32 import java.security.KeyStoreException;
  33 import java.security.NoSuchAlgorithmException;
  34 import java.security.UnrecoverableKeyException;
  35 import java.security.cert.Certificate;
  36 import java.security.cert.CertificateException;
  37 import java.security.cert.X509Certificate;
  38 import java.util.Collections;
  39 import java.util.List;
  40 import java.util.stream.Collectors;
  41
  42 import javax.net.ssl.KeyManagerFactory;
  43
  44 import org.oran.dmaapadapter.configuration.WebClientConfig;
  45 import org.oran.dmaapadapter.configuration.WebClientConfig.HttpProxyConfig;
  46 import org.slf4j.Logger;
  47 import org.slf4j.LoggerFactory;
  48 import org.springframework.util.ResourceUtils;
  49
  50 /**
  51  * Factory for a generic reactive REST client.
  52  */
  53 @SuppressWarnings("squid:S2629") // Invoke method(s) only conditionally
  54 public class AsyncRestClientFactory {
  55     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  56
  57     private final SslContextFactory sslContextFactory;
  58     private final HttpProxyConfig httpProxyConfig;
  59
  60     public AsyncRestClientFactory(WebClientConfig clientConfig) {
  61         if (clientConfig != null) {
  62             this.sslContextFactory = new CachingSslContextFactory(clientConfig);
  63             this.httpProxyConfig = clientConfig.httpProxyConfig();
  64         } else {
  65             logger.warn("No configuration for web client defined, HTTPS will not work");
  66             this.sslContextFactory = null;
  67             this.httpProxyConfig = null;
  68         }
  69     }
  70
  71     public AsyncRestClient createRestClientNoHttpProxy(String baseUrl) {
  72         return createRestClient(baseUrl, false);
  73     }
  74
  75     public AsyncRestClient createRestClientUseHttpProxy(String baseUrl) {
  76         return createRestClient(baseUrl, true);
  77     }
  78
  79     private AsyncRestClient createRestClient(String baseUrl, boolean useHttpProxy) {
  80         if (this.sslContextFactory != null) {
  81             try {
  82                 return new AsyncRestClient(baseUrl, this.sslContextFactory.createSslContext(),
  83                         useHttpProxy ? httpProxyConfig : null);
  84             } catch (Exception e) {
  85                 String exceptionString = e.toString();
  86                 logger.error("Could not init SSL context, reason: {}", exceptionString);
  87             }
  88         }
  89         return new AsyncRestClient(baseUrl, null, httpProxyConfig);
  90     }
  91
  92     private class SslContextFactory {
  93         private final WebClientConfig clientConfig;
  94
  95         public SslContextFactory(WebClientConfig clientConfig) {
  96             this.clientConfig = clientConfig;
  97         }
  98
  99         public SslContext createSslContext() throws UnrecoverableKeyException, NoSuchAlgorithmException,
 100                 CertificateException, KeyStoreException, IOException {
 101             return this.createSslContext(createKeyManager());
 102         }
 103
 104         private SslContext createSslContext(KeyManagerFactory keyManager)
 105                 throws NoSuchAlgorithmException, CertificateException, KeyStoreException, IOException {
 106             if (this.clientConfig.isTrustStoreUsed()) {
 107                 return createSslContextRejectingUntrustedPeers(this.clientConfig.trustStore(),
 108                         this.clientConfig.trustStorePassword(), keyManager);
 109             } else {
 110                 // Trust anyone
 111                 return SslContextBuilder.forClient() //
 112                         .keyManager(keyManager) //
 113                         .trustManager(InsecureTrustManagerFactory.INSTANCE) //
 114                         .build();
 115             }
 116         }
 117
 118         private SslContext createSslContextRejectingUntrustedPeers(String trustStorePath, String trustStorePass,
 119                 KeyManagerFactory keyManager)
 120                 throws NoSuchAlgorithmException, CertificateException, IOException, KeyStoreException {
 121
 122             final KeyStore trustStore = getTrustStore(trustStorePath, trustStorePass);
 123             List<Certificate> certificateList = Collections.list(trustStore.aliases()).stream() //
 124                     .filter(alias -> isCertificateEntry(trustStore, alias)) //
 125                     .map(alias -> getCertificate(trustStore, alias)) //
 126                     .collect(Collectors.toList());
 127             final X509Certificate[] certificates = certificateList.toArray(new X509Certificate[certificateList.size()]);
 128
 129             return SslContextBuilder.forClient() //
 130                     .keyManager(keyManager) //
 131                     .trustManager(certificates) //
 132                     .build();
 133         }
 134
 135         private boolean isCertificateEntry(KeyStore trustStore, String alias) {
 136             try {
 137                 return trustStore.isCertificateEntry(alias);
 138             } catch (KeyStoreException e) {
 139                 logger.error("Error reading truststore {}", e.getMessage());
 140                 return false;
 141             }
 142         }
 143
 144         private Certificate getCertificate(KeyStore trustStore, String alias) {
 145             try {
 146                 return trustStore.getCertificate(alias);
 147             } catch (KeyStoreException e) {
 148                 logger.error("Error reading truststore {}", e.getMessage());
 149                 return null;
 150             }
 151         }
 152
 153         private KeyManagerFactory createKeyManager() throws NoSuchAlgorithmException, CertificateException, IOException,
 154                 UnrecoverableKeyException, KeyStoreException {
 155             final KeyManagerFactory keyManager = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
 156             final KeyStore keyStore = KeyStore.getInstance(this.clientConfig.keyStoreType());
 157             final String keyStoreFile = this.clientConfig.keyStore();
 158             final String keyStorePassword = this.clientConfig.keyStorePassword();
 159             final String keyPassword = this.clientConfig.keyPassword();
 160             try (final InputStream inputStream = new FileInputStream(keyStoreFile)) {
 161                 keyStore.load(inputStream, keyStorePassword.toCharArray());
 162             }
 163             keyManager.init(keyStore, keyPassword.toCharArray());
 164             return keyManager;
 165         }
 166
 167         private synchronized KeyStore getTrustStore(String trustStorePath, String trustStorePass)
 168                 throws NoSuchAlgorithmException, CertificateException, IOException, KeyStoreException {
 169
 170             KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
 171             store.load(new FileInputStream(ResourceUtils.getFile(trustStorePath)), trustStorePass.toCharArray());
 172             return store;
 173         }
 174     }
 175
 176     public class CachingSslContextFactory extends SslContextFactory {
 177         private SslContext cachedContext = null;
 178
 179         public CachingSslContextFactory(WebClientConfig clientConfig) {
 180             super(clientConfig);
 181         }
 182
 183         @Override
 184         public SslContext createSslContext() throws UnrecoverableKeyException, NoSuchAlgorithmException,
 185                 CertificateException, KeyStoreException, IOException {
 186             if (this.cachedContext == null) {
 187                 this.cachedContext = super.createSslContext();
 188             }
 189             return this.cachedContext;
 190
 191         }
 192     }
 193 }