[Dovecot] Wrong credential caching
A user logged in with a captial "L" for his username:
Jul 7 12:30:31 postamt dovecot: auth(default): cache(Loser,10.47.64.227): miss Jul 7 12:30:31 postamt dovecot: auth(default): shadow(Loser,10.47.64.227): lookup Jul 7 12:30:31 postamt dovecot: auth(default): shadow(Loser,10.47.64.227): unknown user Jul 7 12:30:31 postamt dovecot: auth(default): cache(Loser,10.47.64.227): miss Jul 7 12:30:31 postamt dovecot: auth-worker(default): pam(Loser,10.47.64.227): lookup service=dovecot Jul 7 12:30:31 postamt dovecot: auth-worker(default): pam(Loser,10.47.64.227): #1/1 style=1 msg=Password: Jul 7 12:30:33 postamt dovecot: auth-worker(default): pam(Loser,10.47.64.227): unknown user
Then I told him that he's supposed to use an "l" instead of "L" but:
Jul 7 12:42:01 postamt dovecot: imap-login: Login: user=<loser>, method=PLAIN, rip=10.47.64.227, lip=141.42.4.250, TLS Jul 7 12:42:02 postamt dovecot: auth(default): client in: ... Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): hit: Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): User unknown Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): hit: Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): User unknown Jul 7 12:43:50 postamt dovecot: imap-login: Disconnected (auth failed, 1 attempts): user=<Loser>, method=PLAIN, rip=10.47.64.227, lip=141.42.4.250, TLS: Disconnected
I think the auth cache may work case-insensitive, thus making the "User invalid" response for "Loser" also valid for "loser" (which is the valid and correct username!)
-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt@charite.de | http://www.charite.de
On Tue, 2009-07-07 at 12:50 +0200, Ralf Hildebrandt wrote:
Then I told him that he's supposed to use an "l" instead of "L" but:
Jul 7 12:42:01 postamt dovecot: imap-login: Login: user=<loser>, method=PLAIN, rip=10.47.64.227, lip=141.42.4.250, TLS
This is a successful login as "loser". This is logged only after authentication, and I guess there should have been some auth lines before that?
Jul 7 12:42:02 postamt dovecot: auth(default): client in: ... Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): hit: Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): User unknown Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): hit: Jul 7 12:42:02 postamt dovecot: auth(default): cache(Loser,10.47.64.227): User unknown Jul 7 12:43:50 postamt dovecot: imap-login: Disconnected (auth failed, 1 attempts): user=<Loser>, method=PLAIN, rip=10.47.64.227, lip=141.42.4.250, TLS: Disconnected
Here again it looks like the user is logging in a second later as "Loser". Maybe the user has multiple clients? Or the client is just messed up and used both.
I think the auth cache may work case-insensitive,
It's case-sensitive.
I also tried and couldn't reproduce the problem.
- Timo Sirainen tss@iki.fi:
Here again it looks like the user is logging in a second later as "Loser". Maybe the user has multiple clients? Or the client is just messed up and used both.
He changed it back and forth
I think the auth cache may work case-insensitive,
It's case-sensitive.
I also tried and couldn't reproduce the problem.
OK. I hate my users :)
-- Ralf Hildebrandt Geschäftsbereich IT | Abteilung Netzwerk Charité - Universitätsmedizin Berlin Campus Benjamin Franklin Hindenburgdamm 30 | D-12203 Berlin Tel. +49 30 450 570 155 | Fax: +49 30 450 570 962 ralf.hildebrandt@charite.de | http://www.charite.de
participants (2)
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Ralf Hildebrandt
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Timo Sirainen