[owasp-antisamy] Is it possible to use AntiSamy and keep code in pre/code tags intact?

Jason Li jason.li at owasp.org
Wed Sep 21 14:19:09 EDT 2011

I *think* the approach I outlined can potentially accomplish this idea.

My recollection is that with the onUnknownTag, anything not in the policy
file will be encoded.

Hence, you can fill the policy file with *just* the designated tags you want
(e.g. <b>, <a>. <i>, etc) and everything else will be encoded if you specify
the onUnknownTag directive.


On Wed, Sep 21, 2011 at 12:36 PM, Mohamad El-Husseini <
husseini.mel at gmail.com> wrote:

> Thank you all. After doing some research on this I realized my approach is
> wrong.
> I want to allow my users to type whatever they want. What I need is an HTML
> encoder that will encode everything apart from some designated tags, like
> <b>, <a>, and <i>.  In other words, I need the AntiSamy equivalent for
> encoding, not sanitizing.
> I am not aware of something like that, but I'm inclined to think there is.
> If anyone aware of something, please share.
> Many thanks.
> On Wed, Sep 21, 2011 at 12:24 AM, Jason Li <jason.li at owasp.org> wrote:
>> Mohamad,
>> One way that you could potentially make this behavior is to leverage the
>> "onUnknownTag" directive.
>> Using this directive, if a tag is not known (i.e. not explicitly in the
>> policy file), it will HTML-encode the tag.
>> You could remove the script tag from the policy file, hypothetically
>> causing such "unknown" tags to be encoded rather than removed.
>> Note that I'm not certain off the top of my head if the new current
>> release still supports this directive or if this strategy would work safely
>> and accomplish your goal.
>> -Jason
>> On Tue, Sep 20, 2011 at 4:18 PM, Mohamad El-Husseini <
>> husseini.mel at gmail.com> wrote:
>>> Hi everyone!
>>> I want to use AntiSamy to allow users to post code snippets and other
>>> things. Is it possible to customize AntiSamy to allow script tags that are
>>> nested in code/pre tags?
>>> I want to use it in a similar capacity to StackOverFlow: they allow most
>>> basic HTML, including any tags found inside pre/code tags.
>>> AntiSamy strips such tags regardless. Is AntiSamy the right tool for what
>>> I'm trying to do? Andy advice would be appreciated.
>>> Thank you.
>>> _______________________________________________
>>> Owasp-antisamy mailing list
>>> Owasp-antisamy at lists.owasp.org
>>> https://lists.owasp.org/mailman/listinfo/owasp-antisamy
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