1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.security.NoSuchAlgorithmException; 25 26 import javax.net.ssl.SSLContext; 27 import javax.net.ssl.SSLParameters; 28 29 /* 30 * This class is used for returning some specific JDK information. 31 */ 32 public class JdkInfoUtils { 33 34 public static final String JAVA_RUNTIME_VERSION = "javaRuntimeVersion"; 35 public static final String SUPPORTED_PROTOCOLS = "supportedProtocols"; 36 public static final String ENABLED_PROTOCOLS = "enabledProtocols"; 37 public static final String SUPPORTED_CIPHER_SUITES = "supportedCipherSuites"; 38 public static final String ENABLED_CIPHER_SUITES = "enabledCipherSuites"; 39 public static final String SUPPORTS_SNI = "supportsSNI"; 40 public static final String SUPPORTS_ALPN = "supportsALPN"; 41 42 // Returns the JDK build version. javaRuntimeVersion()43 public static String javaRuntimeVersion() { 44 return System.getProperty("java.runtime.version"); 45 } 46 supportedProtocols()47 private static String supportedProtocols() 48 throws NoSuchAlgorithmException { 49 String[] protocols = SSLContext.getDefault() 50 .createSSLEngine().getSupportedProtocols(); 51 return Utilities.join(Utilities.VALUE_DELIMITER, protocols).toString(); 52 } 53 enabledProtocols()54 private static String enabledProtocols() 55 throws NoSuchAlgorithmException { 56 String[] protocols = SSLContext.getDefault() 57 .createSSLEngine().getEnabledProtocols(); 58 return Utilities.join(Utilities.VALUE_DELIMITER, protocols).toString(); 59 } 60 supportedCipherSuites()61 private static String supportedCipherSuites() 62 throws NoSuchAlgorithmException { 63 String[] supportedCipherSuites = SSLContext.getDefault() 64 .createSSLEngine().getSupportedCipherSuites(); 65 return Utilities.join(Utilities.VALUE_DELIMITER, supportedCipherSuites) 66 .toString(); 67 } 68 enabledCipherSuites()69 private static String enabledCipherSuites() 70 throws NoSuchAlgorithmException { 71 String[] enabledCipherSuites = SSLContext.getDefault() 72 .createSSLEngine().getEnabledCipherSuites(); 73 return Utilities.join(Utilities.VALUE_DELIMITER, enabledCipherSuites) 74 .toString(); 75 } 76 77 // Checks if SNI is supported by the JDK build. supportsSNI()78 private static boolean supportsSNI() { 79 boolean isSupported = true; 80 try { 81 SSLParameters.class.getMethod("getServerNames"); 82 } catch (NoSuchMethodException e) { 83 isSupported = false; 84 } 85 return isSupported; 86 } 87 88 // Checks if ALPN is supported by the JDK build. supportsALPN()89 private static boolean supportsALPN() { 90 boolean isSupported = true; 91 try { 92 SSLParameters.class.getMethod("getApplicationProtocols"); 93 } catch (NoSuchMethodException e) { 94 isSupported = false; 95 } 96 return isSupported; 97 } 98 main(String[] args)99 public static void main(String[] args) throws NoSuchAlgorithmException { 100 System.out.print(Utilities.join(Utilities.PARAM_DELIMITER, 101 attr(JAVA_RUNTIME_VERSION, javaRuntimeVersion()), 102 attr(SUPPORTED_PROTOCOLS, supportedProtocols()), 103 attr(ENABLED_PROTOCOLS, enabledProtocols()), 104 attr(SUPPORTED_CIPHER_SUITES, supportedCipherSuites()), 105 attr(ENABLED_CIPHER_SUITES, enabledCipherSuites()), 106 attr(SUPPORTS_SNI, supportsSNI()), 107 attr(SUPPORTS_ALPN, supportsALPN()))); 108 } 109 attr(String name, Object value)110 private static String attr(String name, Object value) { 111 return name + "=" + String.valueOf(value); 112 } 113 } 114