fail2ban/config/filter.d/slapd.conf

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# slapd (Stand-alone LDAP Daemon) openldap daemon filter
#
# Detecting invalid credentials: error code 49
# http://www.openldap.org/doc/admin24/appendix-ldap-result-codes.html#invalidCredentials (49)
[INCLUDES]
# Read common prefixes. If any customizations available -- read them from
# common.local
before = common.conf
[Definition]
_daemon = slapd
prefregex = ^%(__prefix_line)sconn=<F-MLFID>\d+</F-MLFID>(?: (?:fd|op)=\d+){0,2} (?=ACCEPT|RESULT)<F-CONTENT>.+</F-CONTENT>$
failregex = ^<F-NOFAIL>ACCEPT</F-NOFAIL> from IP=<ADDR>:\d{1,5}\s+
^RESULT(?:\s(?!err)\S+=\S*)* err=49\b
ignoreregex =
# Author: Andrii Melnyk, Sergey G. Brester