diff options
Diffstat (limited to 'roles/common/files')
| -rw-r--r-- | roles/common/files/etc/fail2ban/filter.d/dovecot.conf | 39 |
1 files changed, 27 insertions, 12 deletions
diff --git a/roles/common/files/etc/fail2ban/filter.d/dovecot.conf b/roles/common/files/etc/fail2ban/filter.d/dovecot.conf index 4d4ea16..c8f5345 100644 --- a/roles/common/files/etc/fail2ban/filter.d/dovecot.conf +++ b/roles/common/files/etc/fail2ban/filter.d/dovecot.conf @@ -1,4 +1,6 @@ -# Fail2Ban filter Dovecot authentication and pop3/imap server +# Fail2Ban filter Dovecot authentication and pop3/imap/managesieve server +# guilhem 2020-05-19: This is the filter from Buster (fail2ban +# 0.10.2-2.1) with managesieve to the list of protected services # [INCLUDES] @@ -7,26 +9,39 @@ before = common.conf [Definition] -_daemon = (auth|dovecot(-auth)?|auth-worker) +_auth_worker = (?:dovecot: )?auth(?:-worker)? +_daemon = (?:dovecot(?:-auth)?|auth) -# Take the filter from Stretch and add managesieve to the list of protected services -failregex = ^%(__prefix_line)s(?:%(__pam_auth)s(?:\(dovecot:auth\))?:)?\s+authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(?:\s+user=\S*)?\s*$ - ^%(__prefix_line)s(?:pop3|imap|managesieve)-login: (?:Info: )?(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts( in \d+ secs)?|tried to use (disabled|disallowed) \S+ auth)\):( user=<[^>]+>,)?( method=\S+,)? rip=<HOST>(?:, lip=\S+)?(?:, TLS(?: handshaking(?:: SSL_accept\(\) failed: error:[\dA-F]+:SSL routines:[TLS\d]+_GET_CLIENT_HELLO:unknown protocol)?)?(: Disconnected)?)?(, session=<\S+>)?\s*$ - ^%(__prefix_line)s(?:Info|dovecot: auth\(default\)|auth-worker\(\d+\)): pam\(\S+,<HOST>\): pam_authenticate\(\) failed: (User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\))\s*$ - ^%(__prefix_line)s(?:auth|auth-worker\(\d+\)): (?:pam|passwd-file)\(\S+,<HOST>\): unknown user\s*$ - ^%(__prefix_line)s(?:auth|auth-worker\(\d+\)): Info: ldap\(\S*,<HOST>,\S*\): invalid credentials\s*$ +prefregex = ^%(__prefix_line)s(?:%(_auth_worker)s(?:\([^\)]+\))?: )?(?:%(__pam_auth)s(?:\(dovecot:auth\))?: |(?:pop3|imap|managesieve)-login: )?(?:Info: )?<F-CONTENT>.+</F-CONTENT>$ -ignoreregex = +failregex = ^authentication failure; logname=\S* uid=\S* euid=\S* tty=dovecot ruser=\S* rhost=<HOST>(?:\s+user=\S*)?\s*$ + ^(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:auth failed, \d+ attempts(?: in \d+ secs)?|tried to use (?:disabled|disallowed) \S+ auth)\):(?: user=<[^>]*>,)?(?: method=\S+,)? rip=<HOST>(?:[^>]*(?:, session=<\S+>)?)\s*$ + ^pam\(\S+,<HOST>(?:,\S*)?\): pam_authenticate\(\) failed: (?:User not known to the underlying authentication module: \d+ Time\(s\)|Authentication failure \(password mismatch\?\)|Permission denied)\s*$ + ^[a-z\-]{3,15}\(\S*,<HOST>(?:,\S*)?\): (?:unknown user|invalid credentials)\s*$ + <mdre-<mode>> -[Init] +mdre-aggressive = ^(?:Aborted login|Disconnected)(?::(?: [^ \(]+)+)? \((?:no auth attempts|disconnected before auth was ready,|client didn't finish \S+ auth,)(?: (?:in|waited) \d+ secs)?\):(?: user=<[^>]*>,)?(?: method=\S+,)? rip=<HOST>(?:[^>]*(?:, session=<\S+>)?)\s*$ + +mdre-normal = + +# Parameter `mode` - `normal` or `aggressive`. +# Aggressive mode can be used to match log-entries like: +# 'no auth attempts', 'disconnected before auth was ready', 'client didn't finish SASL auth'. +# Note it may produce lots of false positives on misconfigured MTAs. +# Ex.: +# filter = dovecot[mode=aggressive] +mode = normal + +ignoreregex = journalmatch = _SYSTEMD_UNIT=dovecot.service +datepattern = {^LN-BEG}TAI64N + {^LN-BEG} + # DEV Notes: # * the first regex is essentially a copy of pam-generic.conf # * Probably doesn't do dovecot sql/ldap backends properly (resolved in edit 21/03/2016) -# * Removed the 'no auth attempts' log lines from the matches because produces -# lots of false positives on misconfigured MTAs making regexp unusable # # Author: Martin Waschbuesch # Daniel Black (rewrote with begin and end anchors) |