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Old 02-04-2005, 05:28 AM   #1
Registered: Dec 2004
Posts: 145

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Differences between SASL PLAIN and LOGIN mechanism?

When I sniff the datas of SASL authentication(AUTH PLAIN) with snort, I get a ASCII string, Does that the encrypt password of UNIX system account by crypt(3)? Or say: What's the means of PLAIN?

If use AUTH LOGIN, I can get different ASCII string, so what about the differences between PLAIN and LOGIN mechanism?

Thank you.
Old 02-04-2005, 11:46 PM   #2
Registered: Dec 2004
Posts: 145

Original Poster
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Well, how does the ASCII string generate?

For example, I use mutt + esmtp, so if I config ~/.esmtprc like this:
hostname =
username = "roc"
password = "WRONG-PASS"

Then I snort the datas, I get:

I read some documents and say: PLAIN use clear-text password(for example, the: /usr/share/doc/cyrus-sasl-devel-2.1.10/draft-zeilenga-sasl-plain-01.txt &, Is AHJvYwBXUk9ORy1QQVNT the clear-text? I just found it is double length than the password.

and the LOGIN mechanism:
334 UGFzc3dvcmQ6..

Is there anyone can give me some advices?

Thank you.

Last edited by Chowroc; 02-04-2005 at 11:48 PM.


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