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Mod ReWrite - Protect an image.

Posted on 2009-05-12
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Last Modified: 2012-05-06
I have an image in a directory called:

/charts/chart.png

I want my index page to be able to access the file but I want to exclude everybody else from accessing the file.

Could somebody write me the .htaccess file with the mod rewrite rules?

Assume the following directory structure.

/index.php
/charts/.htaccess
/charts/chart.png

When somebody visits index.php I want them to see /charts/chart.png.

When somebody visits /charts/chart.png I want them to see nothing.
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Question by:lwfuk
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15 Comments
 
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Assisted Solution

by:osintsev
osintsev earned 250 total points
ID: 24368307
Your /charts/.htaccess looks like this
RewriteEngine  On

RewriteCond %{HTTP_REFERER} !^$

RewriteCond %{HTTP_REFERER} !^http://(www\.)?yourdomain.com/.*$ [NC]

RewriteRule ^(.*)$ - [F]

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Assisted Solution

by:Beverley Portlock
Beverley Portlock earned 250 total points
ID: 24368345
Try adding these lines

RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !^http://(www\.)?yourdomain.com/.*$ [NC]
RewriteRule \.(gif|jpg|png|swf)$ - [F]

Basically, anyone who attempts to view an image but who was not referred by anyone on your website is denied (gets a [F]orbidden error)
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Expert Comment

by:osintsev
ID: 24368352
But keep in mind this is not 100% protection (but quite sufficient), because  Referer: http-header can be forged by web client.
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Author Comment

by:lwfuk
ID: 24368490
Dear osintsev / bportlock

I'm having trouble.

I put the code in an htaccess file at both the root level and at the directory level and the rules are being ignored.

Is it because I placed the htaccess file in the wrong place or do I need to modify the apache config file?

How can I tell if mod rewrite is on?
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Author Comment

by:lwfuk
ID: 24368500
PS I have root access to the server.
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Expert Comment

by:osintsev
ID: 24368521
In your httpd.conf for this directory

AllowOverride All

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Expert Comment

by:osintsev
ID: 24368542
Something like this
<Directory /var/www/>

    Options -Indexes FollowSymLinks MultiViews

    DirectoryIndex main.php

    AllowOverride All

    Order allow,deny

    allow from all

</Directory>

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Expert Comment

by:Beverley Portlock
ID: 24368599
If you have root access then placing these directives in the relevant <VirtualHost> section is the way to go. Faster than .htaccess and you do not have to worry about Overrides
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Expert Comment

by:osintsev
ID: 24368667
If you placing these directives in the relevant <VirtualHost> section be careful, because these rules will work for all files on your site, not only for files in the /charts/ directory. In this case, you want to use  relevant <Directory> section inside <VirtualHost>
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Author Comment

by:lwfuk
ID: 24368910
Still having problems and it's late so I'll return to this tommorrow.

I'll share the points equally between you.

Many Thanks.

Adrian Smith
London
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Expert Comment

by:osintsev
ID: 24369061
A bit surprised that equally, given that bportlock almost copied my example and give one not accurate suggestion which in general does not influence an essence of the matter. I have no claims, but I was a little upset, but it is your right.
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Expert Comment

by:Beverley Portlock
ID: 24369086
"If you placing these directives in the relevant <VirtualHost> section be careful, because these rules will work for all files on your site,"

Indeed, but some people do it that way, otherwise you are correct and it could be installed along the following lines

<VirtualHost .... >
   ServerName .....

   <Directory /var/www/yourdomain.com>
      ..... other directives
      RewriteEngine On
      RewriteCond %{HTTP_REFERER} !^$
      RewriteCond %{HTTP_REFERER} !^http://(www\.)?yourdomain.com/.*$ [NC]
      RewriteRule \.(gif|jpg|png|swf)$ - [F]
   </Directory>

   ... more directives
</VirtualHost>

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Author Comment

by:lwfuk
ID: 24375281
Dear osintsev

I would have given you the full marks but bportlock did not copy you. bportlock added the important line.

RewriteRule \.(gif|jpg|png|swf)$ - [F]

Sorry if your feelings are hurt but this is a forum for engineers who want to help each other and I am greateful to you both.

Many Thanks,

Adrian Smith
London
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Accepted Solution

by:
lwfuk earned 0 total points
ID: 24375305
In the end I found a better solution which I documented here.

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_24401292.html
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Expert Comment

by:Beverley Portlock
ID: 24375886
@Osintsev - just to be clear, I did not copy your solution, the example I gave is based on the one in the Apache documentation on how to prevent hotlinking. It is often the case that a standard solution is widely known and offered by several experts on the forum more or less simultaneously. See this one were cxr and myself both posted virtually the same answer twice

http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_24401593.html


In this question we both offered differing suggestions so I feel that the OP was correct to split the points. I have (on other questions) given correct solutions only to see the points going to whoever posted last.

@lwfuk - thanks for the points and I'm glad you solved your problem. I notice that the solution you settled on was a variant of the suggestions above in that it depends on determining the referrer. Still, as long as it works....
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