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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2131) External DTD files are accessed without a privileged block when Derby parses XML values that reference such DTDs.
Date Fri, 01 Dec 2006 00:52:22 GMT
    [ http://issues.apache.org/jira/browse/DERBY-2131?page=comments#action_12454791 ] 
Daniel John Debrunner commented on DERBY-2131:

Finally got around to looking at the patch. It's generally correct, but you probably want
to catch the PrivilegedExceptionAction and unwrap it. Then if there's an i/o error accessing
the DTD it won't appear as a possible security exception to the user.

The other general rule with privileged blocks is to put as little code as possible into the
priv block, I'm not sure what code requires the privilege block, but here's an example re-write.

       final InputSource is = new  InputSource(new StringReader(xmlAsText));
        aList.add( java.security.AccessController.doPrivileged(
            new java.security.PrivilegedExceptionAction()
                public Object run() throws Exception
                    return dBuilder.parse(is);

> External DTD files are accessed without a privileged block when Derby parses XML values
that reference such DTDs.
> -----------------------------------------------------------------------------------------------------------------
>                 Key: DERBY-2131
>                 URL: http://issues.apache.org/jira/browse/DERBY-2131
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions:,,,
>            Reporter: A B
>         Assigned To: A B
>             Fix For:
>         Attachments: d2131_v1.patch
> The Derby XMLPARSE operator ultimately makes a call to an external JAXP parser (ex. Xerces
or Crimson) to parse an XML value.  If the XML value that is being parsed references an external
DTD, then the JAXP parser will need to read the DTD file to complete parsing.  However, the
current code in SqlXmlUtil.java does not use a privileged block when it calls out to the JAXP
parser.  As a result, when a user who is running with a security manager tries to insert a
document that references an external DTD, the call to XMLPARSE will fail with a security exception--even
if the JAXP parser has the required "read" permissions.

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