Tuesday, December 22, 2009

Chrome, SSL and Tomcat - or other JSSE-based engines

If you try to use Chromium with a java server running https - be aware of  this bug:

Chrome will use a nice TLS extension - RFC4507, SessionTicket - to allow servers to reuse the session without a second roundtrip and without having to cache the session ( which is quite tricky if you use load balancing - there is no easy way in java to do so ). Of course - JSSE doesn't support the extension, the bug is that it can't even ignore it. Besides saving the roundtrip this also saves some CPU time on both ends - good thing chrome added this.

I spent some time today trying to figure out what was happening - the good news seems to be that it's fixed in recent jdk builds. Unfortunately ubuntu doesn't have the fix yet (not even Karmic), and probably Mac is also behind.

Filed a chrome bug as well - I think reversing the order of SessionTicket and hostname extension would solve this.

The server name extension is another nice thing - it allows chrome to specify which host it's looking for in the first ClientHelo packet - so server can send the right certificate. The "Host" header will be sent after the encryption is started - this is why many https servers require one IP address per host and can't do virtual hosting with SSL.


Anna Schafer said...

These powerful little tools are just another great reason to hop on the Google Chrome train. chrome extension development

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