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Editing: named-refused.conf

# Fail2Ban filter file for named (bind9).
#

# This filter blocks attacks against named (bind9) however it requires special
# configuration on bind.
#
# By default, logging is off with bind9 installation.
#
# You will need something like this in your named.conf to provide proper logging.
#
# logging {
#     channel security_file {
#         file "/var/log/named/security.log" versions 3 size 30m;
#         severity dynamic;
#         print-time yes;
#     };
#     category security {
#         security_file;
#     };
# };

[Definition]

# Daemon name
_daemon=named(?:-\w+)?

# Shortcuts for easier comprehension of the failregex

__pid_re=(?:\[\d+\])
__daemon_re=$?%(_daemon)s(?:\(\S+$)?\)?:?
__daemon_combs_re=(?:%(__pid_re)s?:\s+%(__daemon_re)s|%(__daemon_re)s%(__pid_re)s?:)

_category = (?!error|info)[\w-]+
_category_re = (?:%(_category)s: )?

#       hostname       daemon_id         spaces
# this can be optional (for instance if we match named native log files)
__line_prefix=\s*(?:\S+ %(__daemon_combs_re)s\s+)?%(_category_re)s

prefregex = ^%(__line_prefix)s(?:(?:error|info):\s*)?client(?: @\S*)? <HOST>#\S+(?: $[\S.]+$)?: <F-CONTENT>.+</F-CONTENT>\s(?:denied(?: $[^$]*\))?|$NOTAUTH$)\s*$

failregex = ^(?:view (?:internal|external): )?query(?: $cache$)?
            ^zone transfer
            ^bad zone transfer request: '\S+/IN': non-authoritative zone

ignoreregex =

# DEV Notes:
# Trying to generalize the
#          structure which is general to capture general patterns in log
#          lines to cover different configurations/distributions
#          
# Author: Yaroslav Halchenko

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