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http://bugs.exim.org/show_bug.cgi?id=1170




--- Comment #5 from Jeremy Harris <[email protected]>  2014-05-09 15:37:48 
---
The above commit gets us partway there: we have observability
(though as Bjoern notes, stronger hashes would be good).

On the server side we can do enforcement in any post-TLS-startup ACL
(meaning acl_smtp_helo, so long as you check for def:tls_in_cipher).
There's a security argument for being able to reject the TLS startup
negotiation
but this would require another ACL (acl_smtp_tls ?)

As a client we cannot do enforcement yet; this seems to need a TLS-verification
transport option, returning boolean to accept/deny the connection.


The possibilities here are couched in terms of "tools for the box", allowing
flexibility for meeting not-yet-requested needs.   There is an alternate view
that such are too much rope to give the consumer, for they will get it wrong.


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