Question

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

Asked by: johnsit

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via some blacklists I have implemented the users can click on the cached results in the google results and athough out of date can still see the cached page.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.

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Asked On
2009-11-03 at 09:15:10ID24867889
Topics

Linux Networking

,

Computer Servers

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: jb1devPosted on 2009-11-03 at 16:57:42ID: 25735518

I got this to work using the below regexes. I think your issue with the last regex was not escaping the "?" character.

Also my version of squidGuard might be different than yours because your syntax caused my version to complain. Also tweaked some of the other regexes. Maybe it's a locale issue but for me, images come from images.google.com so I thought it made sense to prepend the .* but maybe that's not necessary. My version uses "rew" not "rewrite" and I open with a curly brace and close with a curly brace which must be on a line by itself it seems.

rew google {
    s@(.*google.com/search.*q=.*)@\1\&safe=active@i
    s@(.*google.com/images.*q=.*)@\1\&safe=active@i
    s@(.*google.com/news.*q=.*)@\1\&safe=active@i
    s@(.*search\?q=cache.*)@http://www.yourblockpage.com@i
}
                                              
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Select allOpen in new window

 

by: jb1devPosted on 2009-11-03 at 17:01:15ID: 25735539

Probably the ^ (starts with) would cause problems too, as the url won't start with "search".

Note that all of google's cache is referred to directly by IP, so you could potentially just block all URLs with IPs using:

pass !in-addr

in your acl source.


 

by: johnsitPosted on 2009-11-04 at 01:40:24ID: 25737690

Thanks for your comments and response however it doesnt seem to work for me..

 

by: johnsitPosted on 2009-11-04 at 02:08:42ID: 25737818

Sorry, when you refer to the !in-addr config line I do actually have that but thought (and sorry if its my misunderstanding) that would prevent IP adresses of items which are on the BLs not all IP addresses in the browser. At least thats what seems to be happening with mine.

Thanks again

 

by: johnsitPosted on 2009-11-04 at 06:38:59ID: 25739680

Finally managed to get this working.

Thanks for the input and i did end up using your config line.

The issue as to why it wasnt working was that i had the !in-addr in the same line as to where the regexes were specified. I removed from there and added to the default area and all working fantastically.

Thanks for your help. Awarding points now.

20120131-EE-VQP-002

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