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Server Software: Apache
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Dir : ~/usr/share/doc/fail2ban/dist-config/filter.d/

View File Name : apache-overflows.conf

# Fail2Ban filter to block web requests on a long or suspicious nature
#

[INCLUDES]

# overwrite with apache-common.local if _apache_error_client is incorrect.
before = apache-common.conf

[Definition]

failregex = ^%(_apache_error_client)s (?:(?:AH001[23][456]: )?Invalid (method|URI) in request\b|(?:AH00565: )?request failed: URI too long \(longer than \d+\)|request failed: erroneous characters after protocol string:|(?:AH00566: )?request failed: invalid characters in URI\b)

ignoreregex =

# DEV Notes:
#
# [sebres] Because this apache-log could contain very long URLs (and/or referrer), 
#          the parsing of it anchored way may be very vulnerable (at least as regards 
#          the system resources, see gh-1790). Thus rewritten without end-anchor ($).
# 
# fgrep -r 'URI too long' httpd-2.*
#   httpd-2.2.25/server/protocol.c:                          "request failed: URI too long (longer than %d)", r->server->limit_req_line);
#   httpd-2.4.4/server/protocol.c:                              "request failed: URI too long (longer than %d)",
#
# fgrep -r 'in request' ../httpd-2.* | fgrep Invalid
#   httpd-2.2.25/server/core.c:                     "Invalid URI in request %s", r->the_request);
#   httpd-2.2.25/server/core.c:                          "Invalid method in request %s", r->the_request);
#   httpd-2.2.25/docs/manual/rewrite/flags.html.fr:avertissements 'Invalid URI in request'.
#   httpd-2.4.4/server/core.c:                     "Invalid URI in request %s", r->the_request);
#   httpd-2.4.4/server/core.c:                              "Invalid method in request %s - possible attempt to establish SSL connection on non-SSL port", r->the_request);
#   httpd-2.4.4/server/core.c:                              "Invalid method in request %s", r->the_request);
#
# fgrep -r 'invalid characters in URI' httpd-2.*
#   httpd-2.4.4/server/protocol.c:                              "request failed: invalid characters in URI");
#
# http://svn.apache.org/viewvc/httpd/httpd/trunk/server/core.c?r1=739382&r2=739620&pathrev=739620
#   ...possible attempt to establish SSL connection on non-SSL port
#
# https://wiki.apache.org/httpd/ListOfErrors
# Author: Tim Connors