59 lines
2.2 KiB
Ruby
59 lines
2.2 KiB
Ruby
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# This plugin checks if the client is listed in DNSBLs (DNS Blackhole Lists).
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# These are lists of IP addresses misbehaving. There are many DNSBLs, some are more
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# aggressive than others. More information at http://en.wikipedia.org/wiki/DNSBL
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#
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# This plugin will perform one DNS request per client per blocklist.
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# This plugin will deny service to clients those blocklists have listed.
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# Whether any of this is acceptable is up to you.
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#
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# mailto:joost@spacebabies.nl
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# License: MIT License, like Rails.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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# Version 1.2
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# http://www.spacebabies.nl/dnsbl_check
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require 'resolv'
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module DNSBL_Check
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$dnsbl_passed ||= []
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DNSBLS = %w{list.dsbl.org bl.spamcop.net sbl-xbl.spamhaus.org}
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private
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# Filter to check if the client is listed. This will be run before all requests.
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def dnsbl_check
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return true if $dnsbl_passed.include? request.remote_addr
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passed = true
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threads = []
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request.remote_addr =~ /(\d+).(\d+).(\d+).(\d+)/
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# Check the remote address against each dnsbl in a separate thread
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DNSBLS.each do |dnsbl|
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threads << Thread.new("#$4.#$3.#$2.#$1.#{dnsbl}") do |host|
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logger.warn("Checking DNSBL #{host}")
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addr = Resolv.getaddress("#{host}") rescue ''
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if addr[0,7]=="127.0.0"
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logger.info("#{request.remote_addr} found using DNSBL #{host}")
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passed = false
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end
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end
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end
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threads.each {|thread| thread.join(2)} # join threads, but use timeout to kill blocked ones
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# Add client ip to global passed cache if no dnsbls objected. else deny service.
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if passed
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$dnsbl_passed = $dnsbl_passed[0,49].unshift request.remote_addr
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logger.warn("#{request.remote_addr} added to DNSBL passed cache")
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else
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render :text => 'Access denied', :status => 403
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return false
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end
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end
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end
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