You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
2.9 KiB
Plaintext
69 lines
2.9 KiB
Plaintext
2 years ago
|
# Fail2Ban filter for sendmail spam/relay type failures
|
||
|
|
#
|
||
|
|
# Some of the below failregex will only work properly, when the following
|
||
|
|
# options are set in the .mc file (see your Sendmail documentation on how
|
||
|
|
# to modify it and generate the corresponding .cf file):
|
||
|
|
#
|
||
|
|
# FEATURE(`delay_checks')
|
||
|
|
# FEATURE(`greet_pause', `500')
|
||
|
|
# FEATURE(`ratecontrol', `nodelay', `terminate')
|
||
|
|
# FEATURE(`conncontrol', `nodelay', `terminate')
|
||
|
|
#
|
||
|
|
# ratecontrol and conncontrol also need corresponding options ClientRate:
|
||
|
|
# and ClientConn: in the access file, see documentation for ratecontrol and
|
||
|
|
# conncontrol in the sendmail/cf/README file.
|
||
|
|
|
||
|
|
[INCLUDES]
|
||
|
|
|
||
|
|
before = common.conf
|
||
|
|
|
||
|
|
[Definition]
|
||
|
|
|
||
|
|
_daemon = (?:(sm-(mta|acceptingconnections)|sendmail))
|
||
|
|
__prefix_line = %(known/__prefix_line)s(?:\w{14,20}: )?
|
||
|
|
addr = (?:IPv6:<IP6>|<IP4>)
|
||
|
|
|
||
|
|
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 \[(\d+\.){3}\d+\])|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, arg1=(?P<dom>\S+), arg2=%(addr)s, relay=((?P=dom) )?\[(\d+\.){3}\d+\](?: \(may be forged\))?, 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+ \[%(addr)s\]$
|
||
|
|
|
||
|
|
mdre-normal =
|
||
|
|
|
||
|
|
mdre-extra = ^(?:\S+ )?\[%(addr)s\](?: \(may be forged\))? did not issue \S+ during connection
|
||
|
|
|
||
|
|
mdre-aggressive = %(mdre-extra)s
|
||
|
|
|
||
|
|
failregex = %(cmnfailre)s
|
||
|
|
<mdre-<mode>>
|
||
|
|
|
||
|
|
# Parameter "mode": normal (default), extra or aggressive
|
||
|
|
# Usage example (for jail.local):
|
||
|
|
# [sendmail-reject]
|
||
|
|
# filter = sendmail-reject[mode=extra]
|
||
|
|
#
|
||
|
|
mode = normal
|
||
|
|
|
||
|
|
ignoreregex =
|
||
|
|
|
||
|
|
journalmatch = SYSLOG_IDENTIFIER=sm-mta + _SYSTEMD_UNIT=sendmail.service
|
||
|
|
|
||
|
|
# DEV NOTES:
|
||
|
|
#
|
||
|
|
# Regarding the multiline regex:
|
||
|
|
#
|
||
|
|
# "No such user" lines generate a failure and needs to be matched together with
|
||
|
|
# another line with the HOST, therefore no-failure line was added as regex, that
|
||
|
|
# contains HOST (see line with tag <F-NOFAIL>).
|
||
|
|
#
|
||
|
|
# Note the capture <F-MLFID>, includes both the __prefix_lines (which includes
|
||
|
|
# the sendmail PID), but also the `\w{14}` which the the sendmail assigned
|
||
|
|
# mail ID (todo: check this is necessary, possible obsolete).
|
||
|
|
#
|
||
|
|
# Author: Daniel Black, Fabian Wenk and Sergey Brester aka sebres.
|
||
|
|
# Rewritten using prefregex by Serg G. Brester.
|