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HomeHomeDNN Open Source...DNN Open Source...Module ForumsModule ForumsForumForumRestricting HTML that can be postedRestricting HTML that can be posted
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1/8/2009 11:44 AM
 
Joshua Beall

Joined: 6/13/2005
Posts: 151

Hi,

Is there a way to restrict what HTML can be posted?  Right now it seems our users can post anything they want, including JavaScript, Flash objects, etc.  It's getting out of hand and there's obvious security vulnerabilities with this ability.

DotNetNuke.Modules.Forum.dll is v4.4.3.40705, and we're on DNN 4.8.4.

  -Josh
 
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1/8/2009 1:16 PM
 
es mamlin


Joined: 3/28/2006
Posts: 733

Here's what you really want -- unfortunately it's only for PHP-based systems:  http://htmlpurifier.org/

Unless you want to add code to FckEditor yourself, your best bet is to find a plug-in to do the job.  I'm not aware of one matching your request (doesn't mean it's not out there, though).  Here's the list of freebie plugins: http://sourceforge.net/tracker/?group_id=75348&atid=737639|FCKeditor's
...and info on installing plugins:  http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/Customization/Plug-ins

Finally, here are all of the current config options for the editor:
http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/Configuration/Configuration_Options

-mamlin

esmamlin atxgeek.me
 
New Post
1/8/2009 1:33 PM
 
es mamlin


Joined: 3/28/2006
Posts: 733

I forgot to mention another option:  Treat all input as untrusted and place your security measures on the display side rather than (or, better yet, in addition to) the input side.

Here's one free product (requires programming to use in DNN!) that takes this approach in the ASP.Net realm:  http://www.brettle.com/neathtml

And a sister product to improve file upload process (no security enhancements here, though):  http://www.brettle.com/neatupload

 

esmamlin atxgeek.me
 
New Post
1/8/2009 1:34 PM
 
Joshua Beall

Joined: 6/13/2005
Posts: 151

Well, restricting what FCKeditor allows them to enter would be good, but what I was really hoping to do was configure the forum software to filter the input that it accepts.  That way the filtering is done on the server (and possibly also on the client), as opposed to be on the client only.  If it's only done on the client, a clever user could always figure out a way to submit whatever HTML he wanted and bypass our security.

  -Josh
 
New Post
1/8/2009 1:36 PM
 
es mamlin


Joined: 3/28/2006
Posts: 733

Joshua Beall wrote
 

Well, restricting what FCKeditor allows them to enter would be good, but what I was really hoping to do was configure the forum software to filter the input that it accepts.  That way the filtering is done on the server (and possibly also on the client), as opposed to be on the client only.  If it's only done on the client, a clever user could always figure out a way to submit whatever HTML he wanted and bypass our security.

  -Josh

I agree -- See my second post, just before your reply...

esmamlin atxgeek.me
 
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