From: Kevin (no email)
Date: Tue Nov 08 2005 - 08:13:44 EST
Hi Folks-
I'm using Cyrus IMAPd v2.2.12.
I'd like to allow clients to authenticate using the plaintext mechanism,
but only if those connections are secured with TLS. Is there a way to
do so?
I have the following settings in imapd.conf:
sasl_minimum_layer: 56
allowplaintext: yes
But I can still connect to the server with unencrypted connections and
do plaintext authentication.
According to man imapd.conf:
sasl_minimum_layer: 0
The minimum SSF that the server will allow a client to negotiate. A
value of 1 requires integrity protection; any higher value requires
some amount of encryption.
Before using the sasl_minimum_layer parameter at all, the server was
allowing plaintext logins that were encrypted with TLS and those that
were not. I figured that by setting this parameter to 2, I would
accomplish my goal of allowing plaintext logins but only if encrypted
with TLS and denying unencrypted plaintext logins. When the setting of
2 failed, I tried 56, but it too allows unencrypted plaintext
authentication.
Is this a bug or am I missing something?
TIA.
-Kevin
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