View Javadoc
1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.handler.codec.http2;
17  
18  import java.util.ArrayList;
19  import java.util.Arrays;
20  import java.util.Collections;
21  import java.util.List;
22  
23  /**
24   * Provides utilities related to security requirements specific to HTTP/2.
25   */
26  public final class Http2SecurityUtil {
27      /**
28       * The following list is derived from <a
29       * href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/SunProviders.html">SunJSSE Supported
30       * Ciphers</a> and <a
31       * href="https://wiki.mozilla.org/Security/Server_Side_TLS#Modern_compatibility">Mozilla Modern Cipher
32       * Suites</a> in accordance with the <a
33       * href="https://tools.ietf.org/html/rfc7540#section-9.2.2">HTTP/2 Specification</a>.
34       *
35       * According to the <a href="https://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html">
36       * JSSE documentation</a> "the names mentioned in the TLS RFCs prefixed with TLS_ are functionally equivalent
37       * to the JSSE cipher suites prefixed with SSL_".
38       * Both variants are used to support JVMs supporting the one or the other.
39       */
40      public static final List<String> CIPHERS;
41  
42      /**
43       * <a href="https://wiki.mozilla.org/Security/Server_Side_TLS#Intermediate_compatibility_.28recommended.29"
44       * >Mozilla Modern Cipher Suites Intermediate compatibility</a> minus the following cipher suites that are black
45       * listed by the <a href="https://tools.ietf.org/html/rfc7540#appendix-A">HTTP/2 RFC</a>.
46       */
47      private static final List<String> CIPHERS_JAVA_MOZILLA_MODERN_SECURITY = Collections.unmodifiableList(Arrays
48              .asList(
49              /* openssl = ECDHE-ECDSA-AES128-GCM-SHA256 */
50              "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
51  
52              /* REQUIRED BY HTTP/2 SPEC */
53              /* openssl = ECDHE-RSA-AES128-GCM-SHA256 */
54              "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
55              /* REQUIRED BY HTTP/2 SPEC */
56  
57              /* openssl = ECDHE-ECDSA-AES256-GCM-SHA384 */
58              "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
59              /* openssl = ECDHE-RSA-AES256-GCM-SHA384 */
60              "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
61              /* openssl = ECDHE-ECDSA-CHACHA20-POLY1305 */
62              "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
63              /* openssl = ECDHE-RSA-CHACHA20-POLY1305 */
64              "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
65  
66              /* TLS 1.3 ciphers */
67              "TLS_AES_128_GCM_SHA256",
68              "TLS_AES_256_GCM_SHA384",
69              "TLS_CHACHA20_POLY1305_SHA256"
70              ));
71  
72      static {
73          CIPHERS = Collections.unmodifiableList(new ArrayList<String>(CIPHERS_JAVA_MOZILLA_MODERN_SECURITY));
74      }
75  
76      private Http2SecurityUtil() { }
77  }