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41 lines
2.1 KiB
41 lines
2.1 KiB
2 years ago
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# Fail2Ban filter to block web requests on a long or suspicious nature
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#
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[INCLUDES]
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# overwrite with apache-common.local if _apache_error_client is incorrect.
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before = apache-common.conf
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[Definition]
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failregex = ^%(_apache_error_client)s (?:(?:AH0013[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)
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ignoreregex =
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# DEV Notes:
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#
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# [sebres] Because this apache-log could contain very long URLs (and/or referrer),
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# the parsing of it anchored way may be very vulnerable (at least as regards
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# the system resources, see gh-1790). Thus rewritten without end-anchor ($).
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#
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# fgrep -r 'URI too long' httpd-2.*
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# httpd-2.2.25/server/protocol.c: "request failed: URI too long (longer than %d)", r->server->limit_req_line);
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# httpd-2.4.4/server/protocol.c: "request failed: URI too long (longer than %d)",
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#
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# fgrep -r 'in request' ../httpd-2.* | fgrep Invalid
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# httpd-2.2.25/server/core.c: "Invalid URI in request %s", r->the_request);
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# httpd-2.2.25/server/core.c: "Invalid method in request %s", r->the_request);
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# httpd-2.2.25/docs/manual/rewrite/flags.html.fr:avertissements 'Invalid URI in request'.
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# httpd-2.4.4/server/core.c: "Invalid URI in request %s", r->the_request);
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# 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);
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# httpd-2.4.4/server/core.c: "Invalid method in request %s", r->the_request);
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#
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# fgrep -r 'invalid characters in URI' httpd-2.*
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# httpd-2.4.4/server/protocol.c: "request failed: invalid characters in URI");
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#
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# http://svn.apache.org/viewvc/httpd/httpd/trunk/server/core.c?r1=739382&r2=739620&pathrev=739620
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# ...possible attempt to establish SSL connection on non-SSL port
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#
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# https://wiki.apache.org/httpd/ListOfErrors
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# Author: Tim Connors
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