tree ef7915e431e44d1394d27d3fb70cdcb0d893e467
parent 9a32abc9e32486b106fbec43a56db9ce25ded190
author Rob N ★ <robn@fastmail.com> 1475910300 +1100
committer Rob N ★ <robn@fastmail.com> 1475910300 +1100

Mail: support SASL EXTERNAL (RFC 4422).

This is needed to allow TLS client certificate auth to work. With
ssl_verify_client configured, the auth daemon can choose to allow the
connection to proceed based on the certificate data.

This has been tested with Thunderbird for IMAP only. I've not yet found a
client that will do client certificate auth for POP3 or SMTP, and the method is
not really documented anywhere that I can find. That said, its simple enough
that the way I've done is probably right.