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Clarify Fail2Ban readme

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Aaron Suggs 2013-06-20 10:54:30 -04:00
parent 24143dd195
commit 2d81fa7217
1 changed files with 7 additions and 5 deletions
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12
README.md
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@ -88,18 +88,20 @@ A [Rack::Request](http://rack.rubyforge.org/doc/classes/Rack/Request.html) objec
req.path == '/login' && req.post? && req.user_agent == 'BadUA'
end
`Rack::Attack::Fail2Ban` can be combined with blacklists to block all requests from misbehaving clients.
#### Fail2Ban
`Fail2Ban.filter` can be used within a blacklists to block all requests from misbehaving clients.
This pattern is inspired by [fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page).
See the [fail2ban documentation](http://www.fail2ban.org/wiki/index.php/MANUAL_0_8#Jail_Options) for more details on
how the parameters work.
# Block requests from IP addresses that misbehave.
# Allow up to 3 bad requests within 10 minutes, then ban the IP for 5 minutes if exceeded
# Block requests containing '/etc/password' in the params.
# After 3 blocked requests in 10 minutes, block all requests from that IP for 5 minutes.
Rack::Attack.blacklist('fail2ban pentesters') do |req|
# `filter` returns truthy value if request fails, or if it's from a previously banned IP
# this causes `blacklist` to block the request
# so the request is blocked
Rack::Attack::Fail2Ban.filter(req.ip, :maxretry => 3, :findtime => 10.minutes, :bantime => 5.minutes) do
# if block is truthy, the count for the IP is incremented
# The count for the IP is incremented if the return value is truthy.
CGI.unescape(req.query_string) =~ %r{/etc/passwd}
end
end