Question

我的Android应用程序依赖于SNI来访问正确的服务器，因此它需要TLS并且不能使用SSLv3。我使用okhttp并进行改造和服务器日志表明突然TLS握手切换到SSLv3并可能保持这种状态一段时间，导致由于缺少服务器名称指示支持而导致重复的主机名验证失败。

我理解在某些情况下（哪些？）okhttp停止使用TLS并切换到SSL作为后备。但是，在SNI的情况下这是不可接受的，有没有办法禁用回退？

示例apache日志：

[Wed May 07 18:00:12.799511 2014] [ssl:debug] [pid 20369:tid 140532403599104] ssl_engine_kernel.c(1891): [client <removed>:51431] AH02041: Protocol: TLSv1, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:00:28.563170 2014] [ssl:debug] [pid 20455:tid 140532646553344] ssl_engine_kernel.c(1891): [client <removed>:51432] AH02041: Protocol: TLSv1, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:00:45.884075 2014] [ssl:debug] [pid 20371:tid 140532445562624] ssl_engine_kernel.c(1891): [client <removed>:51433] AH02041: Protocol: TLSv1, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:01.322657 2014] [ssl:debug] [pid 20455:tid 140532395206400] ssl_engine_kernel.c(1891): [client <removed>:51434] AH02041: Protocol: TLSv1, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:18.361705 2014] [ssl:debug] [pid 20370:tid 140532462348032] ssl_engine_kernel.c(1891): [client <removed>:51435] AH02041: Protocol: TLSv1, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:25.378294 2014] [ssl:debug] [pid 20371:tid 140532487526144] ssl_engine_kernel.c(1891): [client <removed>:51436] AH02041: Protocol: SSLv3, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:40.807100 2014] [ssl:debug] [pid 20369:tid 140532445562624] ssl_engine_kernel.c(1891): [client <removed>:51437] AH02041: Protocol: SSLv3, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:41.154782 2014] [ssl:debug] [pid 20371:tid 140532479133440] ssl_engine_kernel.c(1891): [client <removed>:51438] AH02041: Protocol: SSLv3, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:56.695645 2014] [ssl:debug] [pid 20369:tid 140532504311552] ssl_engine_kernel.c(1891): [client <removed>:51439] AH02041: Protocol: SSLv3, Cipher: RC4-SHA (128/128 bits)
[Wed May 07 18:01:57.252515 2014] [ssl:debug] [pid 20455:tid 140532521096960] ssl_engine_kernel.c(1891): [client <removed>:51440] AH02041: Protocol: SSLv3, Cipher: RC4-SHA (128/128 bits)

Answer 1

由于上述功能请求已添加为配置选项，请参阅here以获取更多信息。

如果您希望拥有一个不会回退到不安全密码套件的严格/安全客户端，请使用此ConnectionSpec：

client.setConnectionSpecs(Collections.singletonList(ConnectionSpec.MODERN_TLS));

或者，您可以定义自己的ConnectionSpec：

    ConnectionSpec spec = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)  
        .tlsVersions(TlsVersion.TLS_1_2)
        .cipherSuites(
              CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
              CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
              CipherSuite.TLS_DHE_RSA_WITH_AES_128_GCM_SHA256)
        .build();  

    client.setConnectionSpecs(Collections.singletonList(spec));

Answer 2

Open a feature request我们会照顾它。

如何使用okhttp禁用SSLv3后备

2 个答案: