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Merge 21fe225f5e into dc899e438f

pull/4020/merge
Bill 2025-07-07 15:02:43 +00:00 committed by GitHub
parent dc899e438f 21fe225f5e
commit b88977b352
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2 changed files with 32 additions and 12 deletions
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25
config/filter.d/sendmail-reject.conf
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@ -20,23 +20,24 @@ before = common.conf
[Definition]
_daemon = (?:(sm-(mta|acceptingconnections)|sendmail))
__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
addr = (?:(?:IPv6:)?<IP6>|<IP4>)
# N.B.: Avoid moving F-MLFID into the entire prefregex because the grouped messages we need have different syslog levels (info vs notice) that break the group if BSD verbose format is set
__prefix_line = %(known/__prefix_line)s<F-MLFID>(?:\w{14,20}: )?</F-MLFID>
prefregex = ^%(__prefix_line)s<F-CONTENT>.+</F-CONTENT>$
prefregex = ^<F-MLFID>%(__prefix_line)s</F-MLFID><F-CONTENT>.+</F-CONTENT>$
cmnfailre = ^ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[%(addr)s\](?: \(may be forged\))?, reject=(?:550 5\.7\.1(?: (?P=email)\.\.\.)?(?: Relaying denied\.)? (?:IP name possibly forged \[(\d+\.){3}\d+\]|Proper authentication required\.|IP name lookup failed \[(\d+\.){3}\d+\]|Fix reverse DNS for \S+)|553 5\.1\.8(?: (?P=email)\.\.\.)? Domain of sender address \S+ does not exist|550 5\.[71]\.1 (?P=email)\.\.\. (Rejected: .*|User unknown))$
^ruleset=check_relay(?:, arg\d+=\S*)*, relay=(\S+ )?\[%(addr)s\](?: \(may be forged\))?, reject=421 4\.3\.2 (Connection rate limit exceeded\.|Too many open connections\.)$
^rejecting commands from (\S* )?\[%(addr)s\] due to pre-greeting traffic after \d+ seconds$
^(?:\S+ )?\[%(addr)s\]: (?:(?i)expn|vrfy) \S+ \[rejected\]$
^<[^@]+@[^>]+>\.\.\. No such user here$
^<F-NOFAIL>from=<[^@]+@[^>]+></F-NOFAIL>, size=\d+, class=\d+, nrcpts=\d+, bodytype=\w+, proto=E?SMTP, daemon=MTA, relay=\S+ \[%(addr)s\]$
cmnfailre = ^ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[<ADDR>\](?: \(may be forged\))?, reject=(?:550 5\.7\.1(?: (?P=email)\.\.\.)?(?: Relaying denied\.)? (?:IP name possibly forged \[(\d+\.){3}\d+\]|Proper authentication required\.|IP name lookup failed \[(\d+\.){3}\d+\]|Fix reverse DNS for \S+)|553 5\.1\.8(?: (?P=email)\.\.\.)? Domain of sender address \S+ does not exist|550 5\.[71]\.1 (?P=email)\.\.\. (Rejected: .*|User unknown))$
^ruleset=check_relay(?:, arg\d+=\S*)*, relay=(\S+ )?\[<ADDR>\](?: \(may be forged\))?, reject=421 4\.3\.2 (Connection rate limit exceeded\.|Too many open connections\.)$
^rejecting commands from (\S* )?\[<ADDR>\] due to pre-greeting traffic after \d+ seconds$
^(?:\S+ )?\[<ADDR>\]: (?:(?i)expn|vrfy) \S+ \[rejected\]$
^<[^@]+@[^>]+>\.\.\. (?:No such user here|User unknown)$
^<F-NOFAIL>from=<[^@]+@[^>]+></F-NOFAIL>, size=\d+, class=\d+, nrcpts=\d+,(?: bodytype=\w+,)? proto=E?SMTP, daemon=MTA(?:-v[46])?, relay=(?:\S+ )?\[<ADDR>]$
mdre-normal =
mdre-extra = ^(?:\S+ )?\[%(addr)s\](?: \(may be forged\))? did not issue \S+ during connection
mdre-extra = ^(?:\S+ )?\[<ADDR>](?: \(may be forged\))? did not issue \S+ during connection
mdre-aggressive = %(mdre-extra)s
mdre-aggressive = ^lost input channel from (\S+ )?\[<ADDR>\] to MTA(?:-v[46])? after (rcpt|mail)$
^ruleset=check_rcpt, arg1=(?P<email><\S+@\S+>), relay=(\S+ )?\[<ADDR>\](?: \(may be forged\))?, reject=(?:450 4\.4\.0(?: (?P=email)\.\.\.)?(?: Relaying temporarily denied\.)?(?: Cannot resolve PTR record for (\d+\.){3}\d+))$
%(mdre-extra)s
failregex = %(cmnfailre)s
<mdre-<mode>>

19
fail2ban/tests/files/logs/sendmail-reject
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@ -94,6 +94,16 @@ Nov 3 11:35:30 Microsoft sendmail[26254]: rA37ZTSC026252: <anton@domain.com>...
# failJSON: { "match": false, "desc": "Different mail ID shouldn't match" }
Nov 3 11:35:30 Microsoft sendmail[26254]: rA37ZTSC026255: from=<anton@domain.com>, size=0, class=0, nrcpts=0, bodytype=8BITMIME, proto=ESMTP, daemon=MTA, relay=163.23.32.95.dsl-dynamic.vsi.ru [95.32.23.163]
# failJSON: { "time": "2024-06-17T13:03:43", "match": false, "host": "127.0.0.1", "desc": "no failure, just cache host for mlfid" }
Jun 17 13:03:43 <mail.info> alarmpi sm-mta[26864]: 55HH324M026864: from=<foo@example.com>, size=0, class=0, nrcpts=0, proto=SMTP, daemon=MTA-v4, relay=localhost [127.0.0.1]
# failJSON: { "time": "2024-06-17T14:37:39", "match": true, "host": "192.168.1.44" }
Jun 17 14:37:39 <mail.notice> alarmpi sm-mta[2794]: 55HIbcGI002794: <baduser@yourhost.com>... User unknown
# failJSON: { "time": "2024-06-17T14:37:39", "match": false, "host": "192.168.1.44", "desc": "no failure, just cache host for mlfid" }
Jun 17 14:37:39 <mail.info> alarmpi sm-mta[2794]: 55HIbcGI002794: from=<root@yourhost.com>, size=108, class=0, nrcpts=0, proto=ESMTP, daemon=MTA-v4, relay=yourrelay [192.168.1.44]
# filterOptions: {"mode": "extra"}
# failJSON: { "time": "2005-03-06T16:55:28", "match": true , "host": "192.0.2.194", "desc": "wrong resp. non RFC compiant (ddos prelude?), MTA-mode" }
@ -112,3 +122,12 @@ Mar 29 22:51:43 server sendmail[3529565]: xA32R2PQ3529565: [192.0.2.2] did not i
Mar 29 22:51:45 server sm-mta[50437]: 06QDQnNf050437: example.com [192.0.2.3] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv4
# failJSON: { "time": "2005-03-29T22:51:46", "match": true , "host": "2001:DB8::1", "desc": "IPv6" }
Mar 29 22:51:46 server sm-mta[50438]: 06QDQnNf050438: example.com [IPv6:2001:DB8::1] did not issue MAIL/EXPN/VRFY/ETRN during connection to IPv6
# aggressive mode # filterOptions: {"mode": "aggressive"}
# failJSON: { "time": "2024-06-17T13:03:43", "match": true, "host": "127.0.0.1" }
Jun 17 13:03:43 <mail.notice> alarmpi sm-mta[26864]: 55HH324M026864: lost input channel from localhost [127.0.0.1] to MTA-v4 after mail
# failJSON: { "time": "2024-06-18T08:05:17", "match": true, "host": "45.125.66.67" }
Jun 18 08:05:17 <mail.notice> myhost sm-mta[17002]: 55IC59VD017002: ruleset=check_rcpt, arg1=<spameri@tiscali.it>, relay=[45.125.66.67], reject=450 4.4.0 <spameri@tiscali.it>... Relaying temporarily denied. Cannot resolve PTR record for 45.125.66.67