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From "Relph,Brian" <Brian.Re...@Cerner.com>
Subject RE: ParameterFilterInterceptor security issue
Date Tue, 12 Aug 2008 14:22:10 GMT
 
I wrote an annotation based parameters interceptor that extends the current parameters interceptor
while allowing you to configure the default "accept" policy for an actions properties, as
well as a per-property annotation that can override the action's policy.  This lets you use
the same interceptor / interceptor stack for all actions, and configure each individually
to accept or reject parameters.  I would still like to add some regex support to the action
annotation.  Would this interest you?

Brian Relph

-----Original Message-----
From: Musachy Barroso [mailto:musachy@gmail.com] 
Sent: Tuesday, August 12, 2008 8:53 AM
To: Struts Developers List
Subject: Re: ParameterFilterInterceptor security issue

I forgot to say, that this would prevent all the OGNL expression tricks, because the property
name that is passed to MemberAccess to be checked, is the actual property name, and not an
expression.

musachy

On Tue, Aug 12, 2008 at 9:48 AM, Musachy Barroso <musachy@gmail.com> wrote:
> It seems to me like there is an elegant solution to this. We can 
> rename StaticMemeberAccess to SecurityMemeberAccess, and in there not 
> only block static member access, but also fields that can be 
> configured using regular expressions. The params interceptor would 
> just set these fields before binding the params.
>
> //OGNL parameter binding just went to #2 in my "must kill" list :)
>
> musachy
>
> On Tue, Aug 12, 2008 at 9:14 AM, Rene Gielen <gielen@it-neering.net> wrote:
>>
>> Am Di, 12.08.2008, 14:20, schrieb Jeromy Evans:
>>>
>>> This relates to Musachy's recent proposal to remove OGNL entirely 
>>> from the parameter-setting process.  Which I think is a very good idea.
>>>
>>
>> Indeed removing OGNL for parameters would fix this issue, but even if 
>> we would decide to do so this won't be trivial and might have many 
>> side effects.
>>
>>> If I've understood correctly, currently there is no way to filter 
>>> the parameter names, using regex or otherwise, other than to verify 
>>> them use a whitelist of valid names.
>>>
>>
>> You can blacklist parameter names in the ParameterInterceptor ref, 
>> including the possibility to define RegExp patterns. The latter one 
>> is not possible for the ParameterFilterInterceptor right now, which I 
>> think is a feature we should add.
>>
>> Jelmer, would you mind creating an Jira issue for that?
>> https://issues.apache.org/struts/
>>
>> - Rene
>>
>>> jelmer wrote:
>>>> Hi all,
>>>>
>>>> I was looking into an easy way to prevent people binding on fields 
>>>> they shouldn't be binding on.
>>>>
>>>> Say you have a User object, you do not want people to be able to 
>>>> bind on the isAdmin property.
>>>>
>>>> Various people remommended using the ParameterFilterInterceptor for 
>>>> this but it seems to be flatout broken
>>>>
>>>> When you configure an action like this
>>>>
>>>> <action name="test" class="com.webapp.action.TestAction">
>>>>     <interceptor-ref name="param-namevalue-filter">
>>>>        <param name="blocked">name</param>
>>>>     </interceptor-ref>
>>>>     <interceptor-ref name="params"/> </action>
>>>>
>>>> then this wont work :
>>>>
>>>> /test.action?name=myname
>>>>
>>>> but this does :
>>>>
>>>> /test.action?(name)=jelmer
>>>>
>>>> and so does this
>>>>
>>>> /test.action?((name))=jelmer
>>>>
>>>> And so on, infact it is impossible to block any parameter 
>>>> effectively with the ParameterFilterInterceptor.
>>>>
>>>>
>>>> Btw. I am aware that there is also the excludeParams method on the 
>>>> ParametersInterceptor that accepts a regexp, so theoretically you 
>>>> could use this to block parameters effectively but it would be 
>>>> extremely hard to write a correct regexp for it. Also I havent 
>>>> found a way to configure both params interceptors in a 
>>>> paramsPrepareParamsStack. This will only configure the first params 
>>>> interceptor in the stack
>>>>
>>>> <interceptor-ref name="clientCrudStack">
>>>>    <param name="params.excludeParams">some pattern</param> 
>>>> </interceptor-ref>
>>>>
>>>> Struts really seems to be lacking in this area.
>>>>
>>>>
>>
>>
>>
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>>
>>
>
>
>
> --
> "Hey you! Would you help me to carry the stone?" Pink Floyd
>



--
"Hey you! Would you help me to carry the stone?" Pink Floyd

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