我在Android 4.4手机上遇到了一个问题(特别是Galaxy S4,虽然我认为这不是手机本身的错误).使用Retrofit2.Http时,我在HTTPS上连接时收到以下错误：

javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x737510d0: Failure in SSL library, usually a protocol error
error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure (external/openssl/ssl/s23_clnt.c:741 0x727fb7d0:0x00000000)

我发现有几个资源表明这是Android 4.4(1)中的一个错误,但给出的示例总是假设使用HttpsUrlConnection类,我没有使用它.

我确实在这里找到了一些关于为连接设置特定ConnectionSpec实例的答案,这似乎很有希望,因为它是特定于Retrofit的(2).不幸的是,这在错误方面没有区别.我的代码示例(我尝试了MODERN_TLS和COMPATIBLE_TLS)：

return new OkHttpClient.Builder()
                .addInterceptor(interceptor)
                .connectionSpecs(Collections.singletonList(ConnectionSpec.MODERN_TLS))
                .build();

切换到“http”确实有效,但这不是最终版本的选项.绝对需要安全的加密连接,因此任何完全禁用HTTPS或盲目接受任何证书的解决方案都不可能被接受.

提前致谢！

(1)Javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: Failure in SSL library, usually a protocol error

(2)Retrofit OkHttp SSLHandshakeException

编辑：

运行openssl给出以下内容：

[[my_computer]]$./openssl s_client -connect [[server_hidden_by_me]]:443 -tls1


CONNECTED(00000003)
depth=2 /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
 0 s:/OU=Domain Control Validated/OU=PositiveSSL/CN=[hidden_by_me]
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
 1 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
   i:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
 2 s:/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Certification Authority
   i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
---
Server certificate
-----BEGIN CERTIFICATE-----
[snip certificate for brevity]
-----END CERTIFICATE-----
subject=/OU=Domain Control Validated/OU=PositiveSSL/CN=[hidden_by_me]
issuer=/C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA Limited/CN=COMODO RSA Domain Validation Secure Server CA
---
No client certificate CA names sent
---
SSL handshake has read 5449 bytes and written 426 bytes
---
New, TLSv1/SSLv3, Cipher is DHE-RSA-SEED-SHA
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
    Protocol  : TLSv1
    Cipher    : DHE-RSA-SEED-SHA
    Session-ID: A4D84E2A0A16DB03082172695141BE1BB562F920ED4E4F6A9139733D9CAB7A54
    Session-ID-ctx: 
    Master-Key: 119C10E5CC34297D1717E4AEAB8BF1CAA8BA012C125B10513FBFE0854B6AB0E9E65536F801990CA3C992FEB69ADBE279
    Key-Arg   : None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - 5c 21 2c ac 68 a9 ef 71-8c 69 2a 86 0c da 6c cd   \!,.h..q.i*...l.
    [snipped for brevity]

    Start Time: 1464109807
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
---

解决方法:

和Nexus 7(Android 4.4.4)有类似的问题.发现它尝试通过我的服务器上默认未启用的TLSv1进行连接.通过启用它来修复=)

您可以使用openssl测试您的服务器：
openssl s_client -connect google.com:443 -tls1

更新：

此代码强制TLSv1在我的设备上,顺便说一下它只支持SSLv3,TLSv1.用okhttp测试：3.3.0

ConnectionSpec spec = new ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
        .tlsVersions(TlsVersion.TLS_1_0)
        .allEnabledCipherSuites()
        .build();

OkHttpClient client = new OkHttpClient.Builder()
        .connectionSpecs(Collections.singletonList(spec))
        .build();

Request request = new Request.Builder()
        .url("https://192.168.0.19:44330")
        .build();

try {
    client.newCall(request).execute();
} catch (IOException e) {
    e.printStackTrace();
}

使用openssl服务器查看它真正使用的协议版本,您将需要证书和密钥文件：

openssl s_server -key key.pem -cert cert.cer -accept 44330 -www -msg

希望这可以帮助！