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Add some docs about admin-side HTML sanitisation

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Hamish Friedlander 2013-07-10 16:24:50 +12:00
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docs/en/topics/security.md
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@ -127,6 +127,38 @@ or [sanitize](http://htmlpurifier.org/) it correctly.
See [http://shiflett.org/articles/foiling-cross-site-attacks](http://shiflett.org/articles/foiling-cross-site-attacks)
for in-depth information about "Cross-Site-Scripting".
### What if I can't trust my editors?
The default configuration of SilverStripe assumes some level of trust is given to your editors who have access
to the CMS. Though the HTML WYSIWYG editor is configured to provide some control over the HTML an editor provides,
this is not enforced server side, and so can be bypassed by a malicious editor. A editor that does so can use an
XSS attack against an admin to perform any administrative action.
If you can't trust your editors, SilverStripe must be configured to filter the content so that any javascript is
stripped out
To enable filtering, set the HtmlEditorField::$sanitise_server_side [configuration](/topics/configuration) property to
true, e.g.
HtmlEditorField::config()->sanitise_server_side = true
The built in sanitiser enforces the TinyMCE whitelist rules on the server side, and is sufficient to eliminate the
most common XSS vectors.
However some subtle XSS attacks that exploit HTML parsing bugs need heavier filtering. For greater protection
you can install the [htmlpurifier](https://github.com/silverstripe-labs/silverstripe-htmlpurifier) module which
will replace the built in sanitiser with one that uses the [HTML Purifier](http://htmlpurifier.org/) library.
In both cases, you must ensure that you have not configured TinyMCE to explicitly allow script elements or other
javascript-specific attributes.
##### But I also need my editors to provide javascript
It is not currently possible to allow editors to provide javascript content and yet still protect other users
from any malicious code within that javascript.
We recommend configuring [shortcodes](/reference/shortcodes) that can be used by editors in place of using javascript directly.
### Escaping model properties
`[api:SSViewer]` (the SilverStripe template engine) automatically takes care of escaping HTML tags from specific