[squid-users] block inappropriate images of google

[Yuri Voinov]

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Also note:

Most browser's anti-proxy plugins exists for Android/Apple.

19.05.15 0:25, Dwayne Hottinger пишет:
> There is a way to use an internal dns server to redirect all google
> searches to their safe search google.  This does help with inappropriate
> images and searches that maybe quesionable.  Just 'google' dns safesearch.
> You should get a few hits.  Im currently doing this and it works very
well.
>
> On Mon, May 18, 2015 at 2:21 PM, Rafael Akchurin <
> rafael.akchurin at diladele.com> wrote:
>
>>  Hello Andres,
>>
>>
>>
>> N.B. Please take my answer with a huge grain of salt.
>>
>>
>>
>> The google images search returns image results  (thumbnails) as inline
>> base 64 encoded images in the CSS. Selectively blocking them with any URL
>> redirector will not work. It is possible to completely block google
images
>> but I assume this is not the way to follow for a school where a lot of
>> pupil projects need access to the image search results.
>>
>>
>>
>> Our current recommend the strategy for blocking explicit search results
>> for schools are (please note you must be doing SSL decryption for this to
>> work!):
>>
>>
>>
>> - enforce Safe Search for Google. In this way proxy adds some special
>> parameter to URL and some HTTP header to all outgoing requests to google
>> servers asking it to show only safe images. Unfortunately this sometime
>> misses quite offensive images as no safe search is safe enough.
>>
>>
>>
>> - add keyword filtering to filter results of image search as it also
>> contains some textual description of images and their original URLs that
>> greatly improves detection rate. Some possible overblocking
definitely will
>> occur.
>>
>>
>>
>> - add image tone detection filtering to the mix (works only for JPEGs for
>> now and higly experimental) :(
>>
>>
>>
>> In order to do that you need to integrate a content scanning server with
>> your Squid – as possible variant consider taking a look at what we
develop
>> exactly for this purpose (search google for qlproxy ICAP – please note it
>> is a commercial product).
>>
>>
>>
>> Other choices are DansGuardian as parent proxy and
>> SquidGuard/ufdbGuard/other redirectors.
>>
>> I hope some other members of the list can explain how to do what your
>> require with these.
>>
>>
>>
>> Best regards,
>>
>> Rafael
>>
>>
>>
>>
>>
>> *From:* squid-users
[mailto:squid-users-bounces at lists.squid-cache.org] *On
>> Behalf Of *Andres Granados
>> *Sent:* Monday, May 18, 2015 7:50 PM
>> *To:* squid-users at lists.squid-cache.org
>> *Subject:* [squid-users] block inappropriate images of google
>>
>>
>>
>> hello!
>>
>> I need help on how to block pornographic images of google, I was trying
>> different options and still do not succeed, try: http_reply_access with
>> request_header_add, and even with a configuration dns, I think is to
>> request_header_add the best, though not it has worked for me, I hope your
>> help, is to implement a school, thanks!
>>
>> _______________________________________________
>> squid-users mailing list
>> squid-users at lists.squid-cache.org
>> http://lists.squid-cache.org/listinfo/squid-users
>>
>>
>
>
>
>
> _______________________________________________
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