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HomeHomeDNN Open Source...DNN Open Source...Module ForumsModule ForumsForumForumEmbed Object ProblemEmbed Object Problem
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9/12/2009 11:51 AM
 
Doug


www.jadexcode.com
Joined: 7/18/2009
Posts: 3

We figured that was the case after looking at the Source code for a bit. We'll explore other options.

Thank you,

Doug
 
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10/2/2009 12:08 PM
 
moverton

Joined: 12/11/2007
Posts: 7

This is a pretty bad restriction in the days of youtube.

Can you point me to the general section of code to make the change?
 
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10/4/2009 3:03 PM
 
Chris Paterra


Joined: 4/5/2003
Posts: 4377

Let's just be clear, this restriction is a core security filter, not my doing. If you remove this, you are opening your forum up to XSS, so you will have to write your own class and replace the core method.

The filter is applied via PostConnector.vb. I have done some changes locally (so my code may be somewhat off from release) but on my machine this is done in a function called ProcessPostBody (may have been in PostToDatabase in that version).

Chris Paterra

Get direct answers to your questions in the Community Exchange.
 
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10/5/2009 9:06 AM
 
moverton

Joined: 12/11/2007
Posts: 7

Crispy wrote
 

Let's just be clear, this restriction is a core security filter, not my doing. If you remove this, you are opening your forum up to XSS, so you will have to write your own class and replace the core method.

The filter is applied via PostConnector.vb. I have done some changes locally (so my code may be somewhat off from release) but on my machine this is done in a function called ProcessPostBody (may have been in PostToDatabase in that version).

Thanks, I understand your point.  I don't intend to remove the filter entirely.  Was just thinking of allowing flash to get through.

Another idea here.  How about coming up with a square bracket substituion.  During save turn this

<object width="425" height="344"><param name="movie" value="http://www.youtube.com/v/nTeevHnWmNQ&hl=en&fs=1&"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/v/nTeevHnWmNQ&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"></embed></object>

into

[object width="425" height="344"][param name="movie" value="http://www.youtube.com/v/nTeevHnWmNQ&hl=en&fs=1&"][/param][param name="allowFullScreen" value="true"][/param][param name="allowscriptaccess" value="always"][/param][embed src="http://www.youtube.com/v/nTeevHnWmNQ&hl=en&fs=1&" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="425" height="344"][/embed][/object]

There would be a check to ensure type="application/x-shockwave-flash" and that there were no unexpected attributes or tags.

During display the software would reverse the substitution and again check the result for unsupported tags and attributes.
 
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10/26/2009 5:56 PM
 
Raymond de Jong

Joined: 1/6/2007
Posts: 36

Running into this issue as well, as i noticed it's a core security filter, but i hope u guys can make a workaround since this is something users want.
Btw, the "Preview" works fine so if it's hacker script injection or something they can still do it with the Preview don't they? It's still a postback to the server.
 
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