Question

Block downloading .mov files using squid

Asked by: rajasekarramasamy

I want to block downloading .mov files from the below sites. I have tried to block with squid but it not working. Here is my squid code. Please check any thing need to add.

http://mediacast.sun.com/users/JeffreyRubinoff/media/php-cc-screencast-67/details

File Name: php-cc-screencast.mov

################# squid.conf #########################
acl Blockextension urlpath_regex -i "/etc/squidfiles/block/blockextension"
http_access deny Blockextension
################# squid.conf #########################

blockextension file contain:

\.mov$





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Asked On
2009-09-15 at 04:23:56ID24732452
Tags

squid

,

cache

,

proxyserver

,

proxy

,

download

,

block

,

linux

,

linux networking

Topics

Linux Networking

,

Linux Distributions

,

Linux Setup

Participating Experts
3
Points
125
Comments
15

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Answers

 

by: guardsman85Posted on 2009-09-15 at 05:11:57ID: 25333947

I was brushing up on my regex syntax and noticed that $ can sometimes match end of characters before line breaks.  Maybe try the following instead.

Ref:  http://www.regular-expressions.info/reference.html

\.mov\z

                                              
1:

Select allOpen in new window

 

by: rajasekarramasamyPosted on 2009-09-15 at 05:18:51ID: 25333999

Hi guardsman85,

I tried with your input but still i can able to download .mov files......

 

by: guardsman85Posted on 2009-09-15 at 10:39:26ID: 25337302

OK, what happens when you add the word "all" at the end?

################# squid.conf #########################
acl Blockextension urlpath_regex -i "/etc/squidfiles/block/blockextension"
http_access deny Blockextension all
################# squid.conf #########################

                                              
1:
2:
3:
4:

Select allOpen in new window

 

by: rajasekarramasamyPosted on 2009-09-15 at 21:37:49ID: 25341920

Hi guardsman85

I added 'all' @ the end of deny statement still i can able to download .mov file

 

by: mwecomputersPosted on 2009-09-16 at 08:17:35ID: 25346536

In your blockextension file, list it this way instead:

\.[Mm][Oo][Vv]$

Reference:
http://www.cyberciti.biz/faq/squid-content-filter-block-files/

 

by: stephenhoekstraPosted on 2009-09-16 at 19:00:11ID: 25352237

acl BadExt url_regex -i \.mov$
http_access deny BadExt all

Post whole squid.conf if it's still not working.

 

by: rajasekarramasamyPosted on 2009-09-16 at 20:56:25ID: 25352726

Hi mwecomputers,

I tried this   \.[Mm][Oo][Vv]$ its not working.

Already I am using -i in acl so there is no problem in case sensitive extension.

 

by: rajasekarramasamyPosted on 2009-09-16 at 21:03:30ID: 25352771

Hi all experts,


The problem is if filename mention in URL means  squid blocking the particular file extension downloading. If file name not mention in URL means squid not blocking it allowing to download.

(eg)  

Squid blocking file download URL: http://www.edccorp.com/products/movies/mtrcyclecrash.mov
(.mov file name mentioned in URL)

Squid not blocking file download URL: http://mediacast.sun.com/users/JeffreyRubinoff/media/php-cc-screencast-67   (.mov file not mention in URL)

 

by: rajasekarramasamyPosted on 2009-09-16 at 21:19:03ID: 25352847

Hi stephenhoekstra,

Its not working..

This my testing squid.conf

acl all src 0.0.0.0/0.0.0.0
acl mynetwork src 192.168.1.0/255.255.255.0
acl Bloackextension url_regex -i \.mov$
http_access deny Blockextension all
http_access allow mynetwork
http_access deny all

 

by: stephenhoekstraPosted on 2009-09-16 at 21:25:01ID: 25352875

Mmm.. You could block the MIME type:

acl x-type req_mime_type -i video/quicktime
http_access deny x-type all


Squid wouldn't block the file if it doesn't say .mov in the URL.  I've seen a workaround for this.  Could be the MIME type, but i'll look around.

 

by: stephenhoekstraPosted on 2009-09-16 at 21:25:48ID: 25352879

Sorry, also need video/x-quicktime

 

by: rajasekarramasamyPosted on 2009-09-16 at 21:59:42ID: 25353010

Hi stephenhoekstra,

I tried this but still i can able to download .mov file from this path.

URL: http://mediacast.sun.com/users/JeffreyRubinoff/media/php-cc-screencast-67/details
File name: php-cc-screencast.mov

acl x-type req_mime_type -i video/quicktime
acl x-type req_mime_type -i video/x-quicktime
http_access deny x-type all
http_access deny x-type1 all

 

by: mwecomputersPosted on 2009-09-17 at 05:25:39ID: 25355202

Another option you might want to consider is setting up an free-to-use Untangle appliance as a transparent bridge between your router and internal network, then using it's Web Filter module to block file formats.

Untangle: http://www.untangle.com

Untangle Web Filter: http://www.untangle.com/Web-Filter

Untangle Web Filter FAQ:
http://wiki.untangle.com/index.php/Web_Content_Control_FAQs#Can_Untangle_Web_Filter_help_me_block_video_and_music_file_formats.3F

 

by: rajasekarramasamyPosted on 2009-09-17 at 05:35:19ID: 25355282

Hi mwecomputers,

Is there any other way?

Dansguardian content filter will rectify my problem?

I need to block extenson using squid or squid add-on. For untangle we need to setup a seprate server. if we forgot to switch on the untangle server or untangle server down means user can able to download blocked extension.

 

by: mwecomputersPosted on 2009-09-17 at 10:04:56ID: 25358446

With all of the above ways, Squid is looking for the exact file to prevent from being accessed. The problem you are having is that is that Squid really doesn't work too well for embedded movie or flash files on a website.

I know under Untangle this can be prevented with the Web Filter.

I have not familiar with Dansguardian, however I found a link that might help:
http://www.linuxquestions.org/questions/linux-server-73/squid-stop-downloads-648255/

20120131-EE-VQP-002

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