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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-6626) Check type of user-supplied modules before creating instances
Date Tue, 01 Jul 2014 10:53:24 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6626?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen updated DERBY-6626:
--------------------------------------

    Attachment: d6626-1a-encryptionProvider.diff

Attached is a patch ([^d6626-1a-encryptionProvider.diff]) which makes JCECipherFactory check
that the class specified in the encryptionProvider connection attribute implements java.security.Provider
before it attempts to create an instance of it. It also adds a test case that verifies that
you get a StandardException instead of a ClassCastException if a class of the wrong type is
specified.

All regression tests ran cleanly with the patch.

> Check type of user-supplied modules before creating instances
> -------------------------------------------------------------
>
>                 Key: DERBY-6626
>                 URL: https://issues.apache.org/jira/browse/DERBY-6626
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous
>    Affects Versions: 10.11.0.0
>            Reporter: Knut Anders Hatlen
>         Attachments: d6626-1a-encryptionProvider.diff
>
>
> Derby allows users to specify names of classes to use for various pluggable modules.
> In some cases, it verifies that the class implements the expected interface before it
creates an instance of the class. For example in SpecificAuthenticactionServiceImpl:
> {code}
> 			Class sasClass = Class.forName(specificAuthenticationScheme);
> 			if (!UserAuthenticator.class.isAssignableFrom(sasClass)) {
> 				throw StandardException.newException(SQLState.AUTHENTICATION_NOT_IMPLEMENTED,
> 					specificAuthenticationScheme, "org.apache.derby.authentication.UserAuthenticator");
> 			}
> 			UserAuthenticator aScheme = (UserAuthenticator) sasClass.newInstance();
> {code}
> In other cases, it creates an instance without checking, and instead fails with a ClassCastException
or some other exception when trying to use the instance of the incorrect type. Examples: Java5SystemProcedures
SYSCS_REGISTER_TOOL(), JCECipherFactory, SequenceUpdater.makePreallocator().
> I think it would be good to have similar checks in these other cases too. That'll give
clearer error messages which explain what the problem is, and it will be safer because it
limits which constructors the users can force the Derby engine to invoke.



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