[Dovecot] Wrong credential caching
Ralf Hildebrandt
Ralf.Hildebrandt at charite.de
Tue Jul 7 13:50:44 EEST 2009
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 at charite.de | http://www.charite.de
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