Re: userrights for localfs_command
Thorsten Weber <[email protected]> Thu, 12 Apr 2012 16:29:12 +0200
| Newsgroups | gmane.comp.cms.zms.devel |
|---|---|
| Message-ID | <[email protected]> |
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Hello again,
I just proceeded as suggested by Sascha and activated verbose-security ( zo=
pe.conf, line 622 )
security-policy-implementation python
verbose-security on
when calling the onChangeObjEvt i find this as Traceback in error_log
Time 2012/04/12 16:07:42.074109 GMT+2=20
User Name (User Id) Anonymous User (None)=20
Request URL http://my_nackend_url/content/e94/manage_main=20
Exception Type Unauthorized
Exception Value <strong>You are not authorized to access this resource.</st=
rong>
Traceback (innermost last):
Module ZPublisher.Publish, line 116, in publish
Module ZPublisher.BaseRequest, line 609, in traverse
Module ZPublisher.HTTPResponse, line 718, in unauthorized
Unauthorized: <strong>You are not authorized to access this resource.</stro=
ng>
This does not say so much to me ... does this help in any way? ( or did i m=
iss something? )
but it is strange that the User is Anonymous !
kind regards,=20=20
Thorsten Weber
Am 04.04.2012 um 09:51 schrieb Thorsten Weber:
> Hello Sascha,
>=20
>=20
> thanks a lot for your detailed and very insightful explanation!
> and you are probably right concerning the exception - which might be rais=
ed silently.
>=20
> until the 10. of april I'm out of the office ...=20
> but i will come back to this as soon as possible and will apply verbose s=
ecurity on a dev instance and provide the traceback.
>=20
>=20
> this for now:
>=20
> ZMS: ZMS2 2.12.1.1047 (Build #132e)
> ZOPE: (2.12.3, python 2.5.2, linux2)
> PYTHON: 2.5.2
>=20
> we generate some xml to feed a flash application when storing an object w=
ithin zms and store it in local filesystem (for performance reasons)
> (localfs_write(path_to_xml, xml_structur_text, mode=3D'b'))
>=20
> and purge that object from cache afterwards
> (localfs_command('/usr/bin/squidclient -h my_squid_ipaddress -p 80 -m P=
URGE http://my_frontend_url')
>=20
> all triggered by onChangeObjEvt
>=20
> but we were facing the problem that the method seems not have the right t=
o execute the commands
> 1. write the new xml file
> 2. calling the squidclient
>=20
> Giving proxy manager rights to that method solved the problem so far.
>=20
>=20
> but from a web application developer view one may expect that these "batt=
eries" might be included within these zms-api calls
> if only when called by with a rather privileged account as ZMSAuthor ..=
. no?
>=20
>=20
> kind regards,=20=20
> Thorsten Weber
>=20
>=20
>=20
> Am 03.04.2012 um 16:10 schrieb Sascha Gottfried:
>=20
>>=20=20
>> Hi Thorsten,
>> Zope Products (in your case: ZMS) offer an API that is available to rest=
ricted code if the required permission can be acquired in the request conte=
xt.
>>=20
>> ZMS 2.12.1 (more specific: class ZMSGlobals.py) offered the method 'loca=
lfs_command' as a public method without requiring any permission from the u=
ser/context to call it. As of today this method is not available anymore as=
a result of a former security review.
>>=20
>> That most probably means, that not the call of the method 'locafs_comman=
d' is raising an exception, but the code in your method 'onChangeObjEvt'. P=
lease provide the traceback to your problem - without I am just guessing. I=
do not want to guess.
>>=20
>> Another hint - during development please change your zope instance to us=
e 'Verbose Security'. Now a security exception tells you exactly what permi=
ssion is required and more. This link shows how to change zope.conf (http:/=
/plone.org/documentation/kb/debug-unauthorized)
>>=20
>> 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 abo=
ut the task you are trying to do.
>>=20
>> @Nils: I accidently addressed the last answer to you.
>>=20
>> A more secure way would be just to find out which permission is needed a=
nd to give this permission to a user. This applies to existing zope permiss=
ions currently not available to ZMSAuthor.
>>=20
>> Another way would be to register a new permission in your application an=
d add it to custom ZMS roles. In your script you could use Zope's API metho=
d checkPermission() or similar to verify that the caller has this permissio=
n. Now it is up to a zope administrator to provide this permission to certa=
in users.=20
>>=20
>> If more methods in ZMS like 'localfs_command' had a proper permission re=
quirement, it would be more easy to application developers to provide the p=
ermissions needed. Usual zope products contain code like this.
>>=20
>> security.declareProtected(permissionName, methodName)
>>=20
>> source:
>> http://docs.zope.org/zope2/zdgbook/Security.html#implementing-security-i=
n-python-products
>>=20
>> Users need this permission to call this method from restriced code (like=
any python script in ZODB). With this in mind - access control to applicat=
ion logic is a matter of user administration.
>>=20
>> That restriction does not apply to file system code like Zope products -=
but ZMS developers usually implement business logic in restricted code. Th=
at's why it is important to know the stuff mentioned above.
>>=20
>> Looking forward to see the traceback,
>> Sascha
>>=20
>> --- 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 availab=
le. This
>> > > script is available for anybody in the web. With this script you acc=
ess
>> > > resources in your file system.=20
>> > ...shure it does - so it is very (!) important to know what the script=
does=20
>> > and allows by theory and in practice...
>> >=20
>> > > Zope has a lot of secure answers for that stuff. If you want to know=
, why=20
>> > > this worked in ZMS a couple of months ago and what you really need t=
o do,=20
>> > > ask me. But I am not sure, if you need a quick fix or a secure solut=
ion for
>> > > your customers.=20
>> >=20
>> > Can you give some more details or examples? "a lot of " is really noth=
ing 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
>> > ---
>> >
>>=20
>=20
>=20
>=20
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<p><div>Hello again,</div><div><br></div><div>I just proceeded as suggested by Sascha and activated verbose-security ( zope.conf, line 622 )</div><div><br></div><div><div><font class="Apple-style-span" face="Courier"> security-policy-implementation python</font></div><div><font class="Apple-style-span" face="Courier"> verbose-security on</font></div></div><div><br></div><div>when calling the onChangeObjEvt i find this as Traceback in error_log</div><div><br></div><div><br></div><div><font class="Apple-style-span" face="Courier"><b>Time</b>
2012/04/12 16:07:42.074109 GMT+2 </font></div><div><font class="Apple-style-span" face="Courier"><b>User Name (User Id)
</b><font class="Apple-style-span" color="#f30000"> Anonymous User (None) </font></font></div><div><font class="Apple-style-span" face="Courier"><b>Request URL</b>
<a href="http://my_nackend_url/content/e94/manage_main">http://my_nackend_url/content/e94/manage_main</a> </font></div><div><font class="Apple-style-span" face="Courier"><b>Exception Type</b>
Unauthorized</font></div><div><font class="Apple-style-span" face="Courier"><b>Exception Value</b>
<strong>You are not authorized to access this resource.</strong></font></div><div><pre>Traceback (innermost last):
Module ZPublisher.Publish, line 116, in publish
Module ZPublisher.BaseRequest, line 609, in traverse
Module ZPublisher.HTTPResponse, line 718, in unauthorized
Unauthorized: <strong>You are not authorized to access this resource.</strong></pre><div><br></div><div>This does not say so much to me ... does this help in any way? ( or did i miss something? )</div><div><br></div><div>but it is strange that the User is Anonymous !</div></div><div><br></div><div><br></div><div><br></div><div apple="true">
<div><div><div><div>kind regards, <br>Thorsten Weber</div><div><br></div></div></div></div>
</div>
<br><div><div>Am 04.04.2012 um 09:51 schrieb Thorsten Weber:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div style="background-color: #fff;">
<span> </span>
<div id="ygrp-text"><p>Hello Sascha,</p><div><br></div><div>thanks a lot for your detailed and very insightful explanation!</div><div>and you are probably right concerning the exception - which might be raised silently.</div><div><br></div><div>until the 10. of april I'm out of the office ... </div><div>but i will come back to this as soon as possible and will apply verbose security on a dev instance and provide the traceback.</div><div><br></div><div><br></div><div>this for now:</div><div><br></div><div>ZMS: ZMS2 2.12.1.1047 (Build #132e)<br>
<a name="_AutoPack"></a>
ZOPE: (2.12.3, python 2.5.2, linux2)<br>
PYTHON: 2.5.2</div><div><br></div><div>we generate some xml to feed a flash application when storing an object within zms and store it in local filesystem (for performance reasons)</div><div>(localfs_write(path_to_xml, xml_structur_text, mode='b'))</div><div><br></div><div>and purge that object from cache afterwards</div><div>(localfs_command('/usr/bin/squidclient -h my_squid_ipaddress -p 80 -m PURGE <a href="http://my_frontend_url'">http://my_frontend_url'</a>)</div><div><br></div><div>all triggered by onChangeObjEvt</div><div><br></div><div>but we were facing the problem that the method seems not have the right to execute the commands</div><div>1. write the new xml file</div><div>2. calling the squidclient</div><div><br></div><div>Giving proxy manager rights to that me
thod solved the problem so far.</div><div><br></div><div><br></div><div>but from a web application developer view one may expect that these "batteries" might be included within these zms-api
calls</div><div>if only when called by with a rather privileged account as ZMSAuthor ... no?</div><div><br></div><div><br></div><div><div apple="true">
<div>kind regards, <br>Thorsten Weber</div><div><br></div><div><br></div><div><br></div></div><div><div>Am 03.04.2012 um 16:10 schrieb Sascha Gottfried:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<div style="background-color: #fff;">
<span> </span>
<div id="ygrp-text"><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 <nd@...> wrote:<br>
><br>
> Am Dienstag, 3. April 2012, 09:21:58 schrieben Sie:<br>
> > what you did as well is giving a script all zope permissions available. This<br>
> > script is available for anybody in the web. With this script you access<br>
> > resources in your file system. <br>
> ...shure it does - so it is very (!) important to know what the script does <br>
> and allows by theory and in practice...<br>
> <br>
> > Zope has a lot of secure answers for that stuff. If you want to know, why <br>
> > this worked in ZMS a couple of months ago and what you really need to do, <br>
> > ask me. But I am not sure, if you need a quick fix or a secure solution for<br>
> > your customers. <br>
> <br>
> Can you give some more details or examples? "a lot of " is really nothing more <br>
> then helpless to anyone here on the list...<br>
> <br>
> <br>
> cheers,<br>
> <br>
> <br>
> Niels.<br>
> -- <br>
> ---<br>
> Niels Dettenbach<br>
> Syndicat IT & Internet<br>
> <a href="http://www.syndicat.com/">http://www.syndicat.com</a><br>
> ---<br>
><br>
<br>
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font: 99% Arial, Helvetica, clean, sans-serif;
}
#ygrp-mlmsg pre, code {
font:115% monospace;
*font-size:100%;
}
#ygrp-mlmsg * {
line-height: 1.22em;
}
#ygrp-mlmsg #logo {
padding-bottom: 10px;
}
#ygrp-mlmsg a {
color: #1E66AE;
}
#ygrp-msg p a {
font-family: Verdana;
}
#ygrp-msg p#attach-count span {
color: #1E66AE;
font-weight: 700;
}
#ygrp-reco #reco-head {
color: #ff7900;
font-weight: 700;
}
#ygrp-reco {
margin-bottom: 20px;
padding: 0px;
}
#ygrp-sponsor #ov li a {
font-size: 130%;
text-decoration: none;
}
#ygrp-sponsor #ov li {
font-size: 77%;
list-style-type: square;
padding: 6px 0;
}
#ygrp-sponsor #ov ul {
margin: 0;
padding: 0 0 0 8px;
}
#ygrp-text {
font-family: Georgia;
}
#ygrp-text p {
margin: 0 0 1em 0;
}
#ygrp-text tt {
font-size: 120%;
}
#ygrp-vital ul li:last-child {
border-right: none !important;
}
-->
</style>
</head>
<!--~-|**|PrettyHtmlEnd|**|-~-->
</html>
<!-- end group email -->
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