如何解决SSL“坏记录MAC”异常

时间:2011-11-16 15:57:22

标签: java sockets networking ssl

我正在使用Apache CXF客户端,在Windows Java 1.6.0_29-b11 VM中运行以连接到IBM大型机(我相信它是zSeries),并调用在那里运行的SOAP Web服务。连接是通过SSL / TLS完成的,大部分时间都可以正常工作。

但是,我不时会收到带有bad record MAC消息的SSL例外。以下是使用javax.net.debug属性的程序输出。

2011-11-16 12:32:37,731 INFO  LoggingOutInterceptor: Outbound Message
---------------------------
ID: 29
Address: https://1.2.3.4/access/servlet/blabla.atk123
Encoding: UTF-8
Content-Type: text/xml
Headers: {Accept=[*/*], SOAPAction=["Blablaaction/ATK123.Execute"]}
Payload: <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Body><ATK123.Execute xmlns="Blabla"><Usrid>WA</Usrid><Usrpwd>54321</Usrpwd><Ultautid>9999</Ultautid></ATK123.Execute></soap:Body></soap:Envelope>
--------------------------------------
pool-1-thread-1, setSoTimeout(30000) called
pool-1-thread-1, WRITE: TLSv1 Application Data, length = 321
pool-1-thread-1, WRITE: TLSv1 Application Data, length = 262
pool-1-thread-1, READ: TLSv1 Application Data, length = 483
pool-1-thread-1, READ: TLSv1 Application Data, length = 16148
pool-1-thread-1, READ: TLSv1 Application Data, length = 282
%% Invalidated:  [Session-1, SSL_RSA_WITH_RC4_128_SHA]
pool-1-thread-1, SEND TLSv1 ALERT:  fatal, description = bad_record_mac
pool-1-thread-1, WRITE: TLSv1 Alert, length = 22
pool-1-thread-1, called closeSocket()
pool-1-thread-1, handling exception: javax.net.ssl.SSLException: bad record MAC
2011-11-16 12:32:38,511 WARN  PhaseInterceptorChain: Interceptor for {Blabla}ATK123#{Blabla}Execute has thrown exception, unwinding now
org.apache.cxf.interceptor.Fault: bad record MAC
    at org.apache.cxf.interceptor.LoggingInInterceptor.logging(LoggingInInterceptor.java:144)
    at org.apache.cxf.interceptor.LoggingInInterceptor.handleMessage(LoggingInInterceptor.java:73)
    at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
    at org.apache.cxf.endpoint.ClientImpl.onMessage(ClientImpl.java:797)
.... (more stuff)

不幸的是,我无法在服务器上修改或调试端点。

导致这种情况的原因是什么?

如何隔离并修复此行为?

2 个答案:

答案 0 :(得分:16)

如果由于网络中的某些故障而导致大量错误数据包,则可能会发生错误的数据包随机存在于32位TCP校验和中。 TCP中会漏掉大约十亿分之一的坏包。一旦将此数据包传送到SSL,它肯定会生成错误的记录MAC,因为SSL Mac的大小为96位。

如果这是原因,唯一的解决方案是改善网络。

请注意,通常情况下,这是错误记录MAC的不太可能的原因。即使是生成错误数据包的硬件故障的网络也不太可能使用正确的IP和TCP元数据生成它们,这样数据包实际上就会传递到与TLS连接相对应的套接字。

答案 1 :(得分:11)

这与Java无关,它是SSL / TLS失败:

20  Bad record MAC  fatal   Possibly a bad SSL implementation, or payload
                            has been tampered with e.g. FTP firewall rule
                            on FTPS server.

它可能与SSL实施有关,而且发送的数据量太大,我怀疑它是随机