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9.3

Squid with squidguard content filter/blacklist (cannot block google cache)

Asked by johnsit in Linux Networking, Computer Servers

Hi All,

I have a squid server with squidguard up and running fine.

I have added the line to the squidguard config of,
rewite google [ s@(google.co.uk/search.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/images.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/news.*q=.*)@\1\&safe=active@i}

which rewrites the urls to force google safe search (hence proves the above method for rewriting urls is valid. Ok so far..

The problem is that when users do a search in google, although the page is blocked via some blacklists I have implemented the users can click on the cached results in the google results and athough out of date can still see the cached page.

The URL format of the cached pages are of the form
http://74.125.77.132/search?q=cache:bAe-5jBVrukJ:www.bbc.co.uk/+bbc&cd=1&hl=en&ct=clnk&gl=uk

The common part of cached results which always appears in the url is the "search?q=cache" part.
Hence one would have thought that replacing the above with,

rewite google [ s@(google.co.uk/search.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/images.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/news.*q=.*)@\1\&safe=active@i
                         s@^(*search?q=cache*)@http://www.someblockpage.com}


would work which it doesnt.

in addition, i have tried,

rewite google [ s@(google.co.uk/search.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/images.*q=.*)@\1\&safe=active@i
                         s@(google.co.uk/news.*q=.*)@\1\&safe=active@i
                         s@^www.yahoo.co.uk@http://www.google.com}

Just as a test to redirect yahoo.co.uk to google hich works fine, proving there is no issue with the asterisk.

Can anyone shed any light on this subject please? Hope Ive made my q clear, plase ask if you need any further info.

Thanks.
[+][-]11/03/09 04:57 PM, ID: 25735518Accepted Solution

Your question has an Asker Certified™ answer! johnsit verified that this solution worked for them--which means it will likely work for you, too. Click to view the solution free for 30-days now.

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Zones: Linux Networking, Computer Servers
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Solution Provided By: jb1dev
Participating Experts: 1
Solution Grade: A
 
[+][-]11/03/09 05:01 PM, ID: 25735539Expert Comment

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