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imap/pop3/smtp: Added support for SASL authentication downgrades

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Added support for downgrading the SASL authentication mechanism when the
decoding of CRAM-MD5, DIGEST-MD5 and NTLM messages fails. This enhances
the previously added support for graceful cancellation by allowing the
client to retry a lesser SASL mechanism such as LOGIN or PLAIN, or even
APOP / clear text (in the case of POP3 and IMAP) when supported by the
server.
This commit is contained in:
Steve Holme
2013-12-18 20:44:20 +00:00
parent b7b126ee41
commit 48043f87b6
6 changed files with 105 additions and 6 deletions
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tests/data/test831
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@@ -11,6 +11,7 @@ IMAP AUTH NTLM
<reply>
<servercmd>
AUTH NTLM
CAPA LOGINDISABLED
REPLY AUTHENTICATE +
REPLY TlRMTVNTUAABAAAABoIIAAAAAAAAAAAAAAAAAAAAAAA= + Rubbish
REPLY * A002 NO AUTH exchange cancelled by client