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Groups > comp.lang.javascript > #26541

Re: Removing scripts

From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups comp.lang.javascript
Subject Re: Removing scripts
Date 2015-01-11 14:23 +0100
Organization PointedEars Software (PES)
Message-ID <15618724.3DthdCSHB2@PointedEars.de> (permalink)
References <100120151843135093%timstreater@greenbee.net> <m8todg$hvs$1@solani.org>

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Christoph M. Becker wrote:

> Tim Streater wrote:
>> I have some untrusted HTML, so I want to de-activate any <scripts> it
>> contains before shoving it into an iframe. Is there any reason not to
>> do the following?
>> […]
>> iframePtr.open ();
>> iframePtr.write (new XMLSerializer().serializeToString (newdoc));
>> iframePtr.close ();
> 
> Have you considered event handler attributes?

Pardon?

> Have you considered to set an appropriate sandbox attribute[1] on the 
> iframe, instead.
> 
> [1]
> [<http://www.w3.org/TR/html5/embedded-content-0.html#attr-iframe-sandbox>

Interesting, but equally unreliable on the Web.

In general, filtering needs to be done server-side, and ISTM that the above 
is client-side code because of “iframePtr.open()” (whereas actually 
“iframePtr” is no pointer variable at all).

-- 
PointedEars
FAQ: <http://PointedEars.de/faq> | SVN: <http://PointedEars.de/wsvn/>
Twitter: @PointedEars2 | ES Matrix: <http://PointedEars.de/es-matrix>
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Thread

Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-10 18:43 +0000
  Re: Removing scripts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-10 22:32 +0100
  Re: Removing scripts Richard Damon <Richard@Damon-Family.org> - 2015-01-10 22:07 -0500
    Re: Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-11 09:16 +0000
  Re: Removing scripts "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-01-11 12:56 +0100
    Re: Removing scripts Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-01-11 14:23 +0100
      Re: Removing scripts "Christoph M. Becker" <cmbecker69@arcor.de> - 2015-01-11 14:47 +0100
    Re: Removing scripts Tim Streater <timstreater@greenbee.net> - 2015-01-11 15:08 +0000

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