filter.d/sendmail-auth.conf: covering several "authentication failure" messages, sendmail 8.16.1 (gh-2757)

config/filter.d/sendmail-auth.conf

@@ -15,8 +15,7 @@ addr = (?:IPv6:<IP6>|<IP4>)
 prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
 
 failregex = ^(\S+ )?\[%(addr)s\]( \(may be forged\))?: possible SMTP attack: command=AUTH, count=\d+$
-            ^AUTH failure \(LOGIN\):(?: [^:]+:)? authentication failure: checkpass failed, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
+            ^AUTH failure \([^\)]+\):(?: [^:]+:)? (?:authentication failure|user not found): [^,]*, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
-            ^AUTH failure \([^\)]+\):(?: [^:]+:)? user not found: [^,]*, user=<F-USER>(?:\S+|.*?)</F-USER>, relay=(?:\S+ )?\[%(addr)s\](?: \(may be forged\))?$
 ignoreregex =
 
 journalmatch = _SYSTEMD_UNIT=sendmail.service

fail2ban/tests/files/logs/sendmail-auth

@@ -27,3 +27,8 @@ Feb 25 04:02:28 relay1 sendmail[16665]: 06I02CNi016765: AUTH failure (LOGIN): au
 May 24 01:58:40 server sm-mta[65696]: 14NNwaRl065696: AUTH failure (DIGEST-MD5): user not found (-20) SASL(-13): user not found: unable to canonify user and get auxprops, user=scanner, relay=[192.0.2.5]
 # failJSON: { "time": "2005-05-24T01:59:07", "match": true , "host": "192.0.2.6", "desc": "user not found (gh-3030)" }
 May 24 01:59:07 server sm-mta[65815]: 14NNx65Q065815: AUTH failure (CRAM-MD5): user not found (-20) SASL(-13): user not found: user: scan@server.example.com property: userPassword not found in sasldb /usr/local/etc/sasldb2, user=scan, relay=[192.0.2.6]
+
+# failJSON: { "time": "2005-05-29T23:14:04", "match": true , "host": "192.0.2.7", "desc": "authentication failure, sendmail 8.16.1 (gh-2757)" }
+May 29 23:14:04 mail sendmail[5976]: 09DJDgOM005976: AUTH failure (login): authentication failure (-13) SASL(-13): authentication failure: checkpass failed, user=test, relay=host.example.com [192.0.2.7] (may be forged)
+# failJSON: { "time": "2005-05-29T23:14:04", "match": true , "host": "192.0.2.8", "desc": "authentication failure, sendmail 8.16.1 (gh-2757)" }
+May 29 23:14:04 mail sendmail[5976]: 09DJDgOM005976: AUTH failure (PLAIN): authentication failure (-13) SASL(-13): authentication failure: Password verification failed, user=test, relay=host.example.com [192.0.2.8]