On Tue, 27 Jan 2015, GitHub wrote:

>  sasl: implement EXTERNAL authentication mechanism.

Many thanks for adding this and for knocking another TODO off the list ;-)

I have often thought about adding this myself as I believed it was relatively 
easy to do, due to the authentication identifier being in the same format as 
the username in LOGIN, however I had always had the following concerns:

* Do we need to limit this to TLS upgraded sessions - the examples in the RFC 
seem to use this as the EXTERNAL authentication mechanism?
* Are there other EXTERNAL mechanisms that can be used rather than client 
certificates?
* Should we implement support for an empty authentication identifier (via an 
empty username) as I believe is allowed in the RFC or do your modifications 
already cater for this?

Kind Regards

Steve

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