Re: userrights for localfs_command

"Sascha Gottfried" <[email protected]> Tue, 03 Apr 2012 14:10:39 -0000
Newsgroups	gmane.comp.cms.zms.devel
Message-ID	<[email protected]>
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Hi Thorsten,
Zope Products (in your case: ZMS) offer an API that is available to restric=
ted code if the required permission can be acquired in the request context.

ZMS 2.12.1 (more specific: class ZMSGlobals.py) offered the method 'localfs=
_command' as a public method  without requiring any permission from the use=
r/context to call it. As of today this method is not available anymore as a=
 result of a former security review.

That most probably means, that not the call of the method 'locafs_command' =
is raising an exception, but the code in your method 'onChangeObjEvt'. Plea=
se provide the traceback to your problem - without I am just guessing. I do=
 not want to guess.

Another hint - during development please change your zope instance to use '=
Verbose Security'. Now a security exception tells you exactly what permissi=
on is required and more. This link shows how to change zope.conf (http://pl=
one.org/documentation/kb/debug-unauthorized)

If you don't mind provide some application details to your next answer. Ple=
ase do not forget the traceback. And if you do not mind tell me more about =
the task you are trying to do.



@Nils: I accidently addressed the last answer to you.

A more secure way would be just to find out which permission is needed and =
to give this permission to a user. This applies to existing zope permission=
s currently not available to ZMSAuthor.

Another way would be to register a new permission in your application and a=
dd it to custom ZMS roles. In your script you could use Zope's API method c=
heckPermission() or similar to verify that the caller has this permission. =
Now it is up to a zope administrator to provide this permission to certain =
users.=20

If more methods in ZMS like 'localfs_command' had a proper permission requi=
rement, it would be more easy to application developers to provide the perm=
issions needed. Usual zope products contain code like this.

security.declareProtected(permissionName, methodName)

source:
http://docs.zope.org/zope2/zdgbook/Security.html#implementing-security-in-p=
ython-products

Users need this permission to call this method from restriced code (like an=
y python script in ZODB). With this in mind - access control to application=
 logic is a matter of user administration.


That restriction does not apply to file system code like Zope products - bu=
t ZMS developers usually implement business logic in restricted code. That'=
s why it is important to know the stuff mentioned above.

Looking forward to see the traceback,
Sascha


--- In [email protected], Niels Dettenbach <nd@...> wrote:
>
> Am Dienstag, 3. April 2012, 09:21:58 schrieben Sie:
> > what you did as well is giving a script all zope permissions available.=
 This
> > script is available for anybody in the web. With this script you access
> > resources in your file system.=20
> ...shure it does - so it is very (!) important to know what the script do=
es=20
> and allows by theory and in practice...
>=20
> > Zope has a lot of secure answers for that stuff. If you want to know, w=
hy=20
> > this worked in ZMS a couple of months ago and what you really need to d=
o,=20
> > ask me. But I am not sure, if you need a quick fix or a secure solution=
 for
> > your customers.=20
>=20
> Can you give some more details or examples? "a lot of " is really nothing=
 more=20
> then helpless to anyone here on the list...
>=20
>=20
> cheers,
>=20
>=20
> Niels.
> --=20
>  ---
>  Niels Dettenbach
>  Syndicat IT & Internet
>  http://www.syndicat.com
>  ---
>


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      <p>Hi Thorsten,<br>
Zope Products (in your case: ZMS) offer an API that is available to restricted code if the required permission can be acquired in the request context.<br>
<br>
ZMS 2.12.1 (more specific: class ZMSGlobals.py) offered the method 'localfs_command' as a public method  without requiring any permission from the user/context to call it. As of today this method is not available anymore as a result of a former security review.<br>
<br>
That most probably means, that not the call of the method 'locafs_command' is raising an exception, but the code in your method 'onChangeObjEvt'. Please provide the traceback to your problem - without I am just guessing. I do not want to guess.<br>
<br>
Another hint - during development please change your zope instance to use 'Verbose Security'. Now a security exception tells you exactly what permission is required and more. This link shows how to change zope.conf (<a href="http://plone.org/documentation/kb/debug-unauthorized">http://plone.org/documentation/kb/debug-unauthorized</a>)<br>
<br>
If you don't mind provide some application details to your next answer. Please do not forget the traceback. And if you do not mind tell me more about the task you are trying to do.<br>
<br>
@Nils: I accidently addressed the last answer to you.<br>
<br>
A more secure way would be just to find out which permission is needed and to give this permission to a user. This applies to existing zope permissions currently not available to ZMSAuthor.<br>
<br>
Another way would be to register a new permission in your application and add it to custom ZMS roles. In your script you could use Zope's API method checkPermission() or similar to verify that the caller has this permission. Now it is up to a zope administrator to provide this permission to certain users. <br>
<br>
If more methods in ZMS like 'localfs_command' had a proper permission requirement, it would be more easy to application developers to provide the permissions needed. Usual zope products contain code like this.<br>
<br>
security.declareProtected(permissionName, methodName)<br>
<br>
source:<br>
<a href="http://docs.zope.org/zope2/zdgbook/Security.html#implementing-security-in-python-products">http://docs.zope.org/zope2/zdgbook/Security.html#implementing-security-in-python-products</a><br>
<br>
Users need this permission to call this method from restriced code (like any python script in ZODB). With this in mind - access control to application logic is a matter of user administration.<br>
<br>
That restriction does not apply to file system code like Zope products - but ZMS developers usually implement business logic in restricted code. That's why it is important to know the stuff mentioned above.<br>
<br>
Looking forward to see the traceback,<br>
Sascha<br>
<br>
--- In <a href="mailto:zms-developers%40yahoogroups.com">[email protected]</a>, Niels Dettenbach &lt;nd@...&gt; wrote:<br>
&gt;<br>
&gt; Am Dienstag, 3. April 2012, 09:21:58 schrieben Sie:<br>
&gt; &gt; what you did as well is giving a script all zope permissions available. This<br>
&gt; &gt; script is available for anybody in the web. With this script you access<br>
&gt; &gt; resources in your file system. <br>
&gt; ...shure it does - so it is very (!) important to know what the script does <br>
&gt; and allows by theory and in practice...<br>
&gt; <br>
&gt; &gt; Zope has a lot of secure answers for that stuff. If you want to know, why <br>
&gt; &gt; this worked in ZMS a couple of months ago and what you really need to do, <br>
&gt; &gt; ask me. But I am not sure, if you need a quick fix or a secure solution for<br>
&gt; &gt; your customers. <br>
&gt; <br>
&gt; Can you give some more details or examples? &quot;a lot of &quot; is really nothing more <br>
&gt; then helpless to anyone here on the list...<br>
&gt; <br>
&gt; <br>
&gt; cheers,<br>
&gt; <br>
&gt; <br>
&gt; Niels.<br>
&gt; -- <br>
&gt;  ---<br>
&gt;  Niels Dettenbach<br>
&gt;  Syndicat IT &amp; Internet<br>
&gt;  <a href="http://www.syndicat.com">http://www.syndicat.com</a><br>
&gt;  ---<br>
&gt;<br>
<br>
</p>

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