enrichment-coordinator-service/src/main/java/org/oransc/enrichment/clients/AsyncRestClientFactory.java

   1 /*-
   2  * ========================LICENSE_START=================================
   3  * O-RAN-SC
   4  * %%
   5  * Copyright (C) 2020 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.oransc.enrichment.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.oransc.enrichment.configuration.WebClientConfig;
  45 import org.oransc.enrichment.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 public class AsyncRestClientFactory {
  54     private static final Logger logger = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
  55
  56     private final SslContextFactory sslContextFactory;
  57     private final HttpProxyConfig httpProxyConfig;
  58
  59     public AsyncRestClientFactory(WebClientConfig clientConfig) {
  60         if (clientConfig != null) {
  61             this.sslContextFactory = new CachingSslContextFactory(clientConfig);
  62             this.httpProxyConfig = clientConfig.httpProxyConfig();
  63         } else {
  64             logger.warn("No configuration for web client defined, HTTPS will not work");
  65             this.sslContextFactory = null;
  66             this.httpProxyConfig = null;
  67         }
  68     }
  69
  70     public AsyncRestClient createRestClientNoHttpProxy(String baseUrl) {
  71         return createRestClient(baseUrl, false);
  72     }
  73
  74     public AsyncRestClient createRestClientUseHttpProxy(String baseUrl) {
  75         return createRestClient(baseUrl, true);
  76     }
  77
  78     private AsyncRestClient createRestClient(String baseUrl, boolean useHttpProxy) {
  79         if (this.sslContextFactory != null) {
  80             try {
  81                 return new AsyncRestClient(baseUrl, this.sslContextFactory.createSslContext(),
  82                     useHttpProxy ? httpProxyConfig : null);
  83             } catch (Exception e) {
  84                 String exceptionString = e.toString();
  85                 logger.error("Could not init SSL context, reason: {}", exceptionString);
  86             }
  87         }
  88         return new AsyncRestClient(baseUrl, null, httpProxyConfig);
  89     }
  90
  91     private class SslContextFactory {
  92         private final WebClientConfig clientConfig;
  93
  94         public SslContextFactory(WebClientConfig clientConfig) {
  95             this.clientConfig = clientConfig;
  96         }
  97
  98         public SslContext createSslContext() throws UnrecoverableKeyException, NoSuchAlgorithmException,
  99             CertificateException, KeyStoreException, IOException {
 100             return this.createSslContext(createKeyManager());
 101         }
 102
 103         private SslContext createSslContext(KeyManagerFactory keyManager)
 104             throws NoSuchAlgorithmException, CertificateException, KeyStoreException, IOException {
 105             if (this.clientConfig.isTrustStoreUsed()) {
 106                 return createSslContextRejectingUntrustedPeers(this.clientConfig.trustStore(),
 107                     this.clientConfig.trustStorePassword(), keyManager);
 108             } else {
 109                 // Trust anyone
 110                 return SslContextBuilder.forClient() //
 111                     .keyManager(keyManager) //
 112                     .trustManager(InsecureTrustManagerFactory.INSTANCE) //
 113                     .build();
 114             }
 115         }
 116
 117         private SslContext createSslContextRejectingUntrustedPeers(String trustStorePath, String trustStorePass,
 118             KeyManagerFactory keyManager)
 119             throws NoSuchAlgorithmException, CertificateException, IOException, KeyStoreException {
 120
 121             final KeyStore trustStore = getTrustStore(trustStorePath, trustStorePass);
 122             List<Certificate> certificateList = Collections.list(trustStore.aliases()).stream() //
 123                 .filter(alias -> isCertificateEntry(trustStore, alias)) //
 124                 .map(alias -> getCertificate(trustStore, alias)) //
 125                 .collect(Collectors.toList());
 126             final X509Certificate[] certificates = certificateList.toArray(new X509Certificate[certificateList.size()]);
 127
 128             return SslContextBuilder.forClient() //
 129                 .keyManager(keyManager) //
 130                 .trustManager(certificates) //
 131                 .build();
 132         }
 133
 134         private boolean isCertificateEntry(KeyStore trustStore, String alias) {
 135             try {
 136                 return trustStore.isCertificateEntry(alias);
 137             } catch (KeyStoreException e) {
 138                 logger.error("Error reading truststore {}", e.getMessage());
 139                 return false;
 140             }
 141         }
 142
 143         private Certificate getCertificate(KeyStore trustStore, String alias) {
 144             try {
 145                 return trustStore.getCertificate(alias);
 146             } catch (KeyStoreException e) {
 147                 logger.error("Error reading truststore {}", e.getMessage());
 148                 return null;
 149             }
 150         }
 151
 152         private KeyManagerFactory createKeyManager() throws NoSuchAlgorithmException, CertificateException, IOException,
 153             UnrecoverableKeyException, KeyStoreException {
 154             final KeyManagerFactory keyManager = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
 155             final KeyStore keyStore = KeyStore.getInstance(this.clientConfig.keyStoreType());
 156             final String keyStoreFile = this.clientConfig.keyStore();
 157             final String keyStorePassword = this.clientConfig.keyStorePassword();
 158             final String keyPassword = this.clientConfig.keyPassword();
 159             try (final InputStream inputStream = new FileInputStream(keyStoreFile)) {
 160                 keyStore.load(inputStream, keyStorePassword.toCharArray());
 161             }
 162             keyManager.init(keyStore, keyPassword.toCharArray());
 163             return keyManager;
 164         }
 165
 166         private synchronized KeyStore getTrustStore(String trustStorePath, String trustStorePass)
 167             throws NoSuchAlgorithmException, CertificateException, IOException, KeyStoreException {
 168
 169             KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
 170             store.load(new FileInputStream(ResourceUtils.getFile(trustStorePath)), trustStorePass.toCharArray());
 171             return store;
 172         }
 173     }
 174
 175     public class CachingSslContextFactory extends SslContextFactory {
 176         private SslContext cachedContext = null;
 177
 178         public CachingSslContextFactory(WebClientConfig clientConfig) {
 179             super(clientConfig);
 180         }
 181
 182         @Override
 183         public SslContext createSslContext() throws UnrecoverableKeyException, NoSuchAlgorithmException,
 184             CertificateException, KeyStoreException, IOException {
 185             if (this.cachedContext == null) {
 186                 this.cachedContext = super.createSslContext();
 187             }
 188             return this.cachedContext;
 189
 190         }
 191     }
 192 }