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31 lines
1.7 KiB
Plaintext
31 lines
1.7 KiB
Plaintext
mod_dosevasive is an evasive maneuvers module for Apache to provide evasive
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action in the event of an HTTP DoS or DDoS attack or brute force attack.
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It is also designed to be a detection and network management tool, and can be
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easily configured to talk to ipchains, firewalls, routers, and etcetera.
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mod_dosevasive presently reports abuses via email and syslog facilities.
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Detection is performed by creating an internal dynamic hash table of IP
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Addresses and URIs, and denying any single IP address from any of the
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following:
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* Requesting the same page more than a few times per second
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* Making more than 50 concurrent requests on the same child per second
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* Making any requests while temporarily blacklisted (on a blocking list)
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This method has worked well in both single-server script attacks as well as
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distributed attacks, but just like other evasive tools, is only as useful to
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the point of bandwidth and processor consumption (e.g. the amount of bandwidth
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and processor required to receive/process/respond to invalid requests), which
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is why it's a good idea to integrate this with your firewalls and routers for
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maximum protection.
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This module instantiates for each listener individually, and therefore has a
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built-in cleanup mechanism and scaling capabilities. Because of this per-child
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design, legitimate requests are never compromised (even from proxies and NAT
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addresses) but only scripted attacks. Even a user repeatedly clicking on
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'reload' should not be affected unless they do it maliciously. mod_dosevasive
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is fully tweakable through the Apache configuration file, easy to incorporate
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into your web server, and easy to use.
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WWW: http://www.zdziarski.com/blog/?page_id=442
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