Request for advice on GNUS internals. GSSAPI progress report

["Elias Mårtenson" <lokedhs@gmail.com>]

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I've now spent a few days figuring out how to do GSSAPI authentication with
IMAP, and I have now managed to complete a full handshake from GNUS with a
Microsoft Exchange server using GSSAPI.

Immediately after authentication is complete, the connection switches to
GSSAPI mode where each packet needs to pass through a call to ‘gss-unwrap’,
and the data sent to the server also needs to be split into packets which
are wrapped using a call to ‘gss-wrap’. The situation is further
complicated by the fact that the server can limit the maximum packet size
during initial handshake.

I need some advice from someone who is well-versed in the internals of GNUS
to explain where I should add the code to handle this.

At first I was looking at create a new ‘nnimap-stream’ type to represent
this, but the connection is already inside a TLS connection which already
uses ‘ssl’ or ‘starttls’ here. The GSSAPI authentication is independent of
the actual connection type, but it wraps all the IMAP commands that are
transmitted over it.

What approach should I take here?

Regards,
Elias

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