From 829f4d830aefedd95a75e61cfc9aa3e03f039c6f Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Tue, 19 May 2020 02:40:48 +0200
Subject: IMAP: Update role to Debian Buster.
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For `ssl_cipher_list` we pick the suggested value from
https://ssl-config.mozilla.org/#server=dovecot&version=2.3.9&config=intermediate&openssl=1.1.1d

At the moment it's equivalent (modulo order) to adding ‘EDH+AESGCM+aRSA’
to ‘EECDH+AESGCM:EECDH+CHACHA20!MEDIUM!LOW!EXP!aNULL!eNULL’.
---
 .../files/etc/fail2ban/filter.d/dovecot.conf       | 39 +++++++++++++++-------
 1 file changed, 27 insertions(+), 12 deletions(-)

(limited to 'roles/common/files/etc/fail2ban/filter.d/dovecot.conf')

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)
-- 
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