Dovecot
Dovecot is a POP3/IMAP server that can also provide authentication for SMTP and other SASL services.
Dovecot-1.0.0 with pam. Other authentication mechanism probably produce different output.
- Jan 11 03:42:09 email dovecot: auth(default): pam(support@example.org,192.0.2.2): pam_authenticate() failed: User not known to the underlying authentication module
- Jan 26 22:31:37 email dovecot: auth(default): pam(dan,192.0.2.2): pam_authenticate() failed: Authentication failure
Dovecot-1.0.15 with sql, and "auth_verbose = yes":
- Jan 11 03:42:09 email dovecot: auth-worker(default): sql(janfrode@tanso.net,192.168.11.16): Password mismatch
- Jan 11 03:45:09 email dovecot: auth-worker(default): sql(someoneelse,192.168.11.16): unknown user
With successfull logins, it doesn't print anything from "auth-worker".
Dovecot-1.2.13, without pam (slackware), with TLS :
- Jul 31 13:53:08 email dovecot: imap-login: Aborted login (auth failed, 1 attempts): user=<someone>, method=PLAIN, rip=192.168.0.2, lip=192.168.0.1, TLS
- Jul 31 13:54:35 email dovecot: imap-login: Disconnected (tried to use unsupported auth mechanism): user=<someone>, method=LOGIN, rip=192.168.2.2, lip=192.168.2.1, TLS: Disconnected
(rip is the IP address of the client, lip is the IP address of the server) Same results with "auth_verbose = yes".
Failregex
The regular expressions below are proposed failregex for this software. Multiple regular expressions for failregex will only work with a version of Fail2ban greater than or equal to 0.7.6.
The tag <HOST> in the regular expressions below is just an alias for (?:::f{4,6}:)?(?P<host>\S+). The replacement is done automatically by Fail2ban when adding the regular expression. At the moment, exactly one named group host or <HOST> tag must be present in each regular expression.
Please, before editing this section, propose your changes in the discussion page first.
failregex = dovecot.*auth\(default\): pam\(.*,<HOST>\): pam_authenticate\(\) failed:
