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Merge pull request #3324 from fail2ban/patch-sendmail-no-user-part 

filter.d/sendmail-auth.conf: detect failures without user part
0.10
Sergey G. Brester 2022-08-01 09:40:12 +02:00 committed by GitHub
parent 7ba8f437f1 514cca9ade
commit bcac47d549
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2 changed files with 3 additions and 1 deletions
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2
config/filter.d/sendmail-auth.conf
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@ -15,7 +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 \([^\)]+\):(?: [^:]+:)? (?:authentication failure|user not found): [^,]*, 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+ )?\[%(addr)s\](?: \(may be forged\))?$
ignoreregex =
journalmatch = _SYSTEMD_UNIT=sendmail.service

2
fail2ban/tests/files/logs/sendmail-auth
View File

@ -32,3 +32,5 @@ May 24 01:59:07 server sm-mta[65815]: 14NNx65Q065815: AUTH failure (CRAM-MD5): u
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]
# failJSON: { "time": "2005-05-29T23:14:05", "match": true , "host": "192.0.2.9", "desc": "authentication failure, no user part (gh-2757)" }
May 29 23:14:05 server sendmail[25411]: 26H8MRrS025411: AUTH failure (LOGIN): authentication failure (-13) SASL(-13): authentication failure: checkpass failed, relay=[192.0.2.9]