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From "Aaron Digulla (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3083) Network server demands a file called "derbynet.jar" in classpath
Date Wed, 21 Nov 2007 09:38:43 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544392

Aaron Digulla commented on DERBY-3083:

> No, my argument is that there is a vulnerability, thus it is subject to be being exploited.

Okay, let me see if we're on the same track here: A Security Manager will do this: It will
enforce allowed operations on specific JARs on the classpath. The JARs are not signed and
not protected in any way other than their name and path.

So Daniel's arguments boils down to this: "I enhance security by enforcing the JAR to have
a certain name/path". I do not believe this is true. As long as I can add malicious code to
the JAR without the SM noticing, enforcing the name will not give additional protection. Therefore,
enforcing a specific name will only add a false sense of security which isn't really there.
This is even more dangerous than having an unknown vulnerability since people will believe
they are safe when they are not.

To be as safe as we can possibly be, I suggest that you use Class.getResource() on specific
classes which should be on the classpath and strip the package and class from the resulting
URL. This will be as safe as the static JAR names (as to my argument above) and it will work
for both the case that the JARs have been renamed and that they have been collected in an

For the same reasons, storing these URLs in the system properties (or any global variable)
is okay too, because this cannot be exploited from a remote attacker and the SM doesn't give
any protection against a local attacker anyway. As long as users use the supplied code, they
will be perfectly safe as long as no one can modify the classpath when the server is started.
If they embed the code in a larger app, they have to think about security themselves; we aren't
able to forsee what they might do and therefore, we can't make their code secure for them
at this time.

> Network server demands a file called "derbynet.jar" in classpath
> ----------------------------------------------------------------
>                 Key: DERBY-3083
>                 URL: https://issues.apache.org/jira/browse/DERBY-3083
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions:
>            Reporter: Aaron Digulla
>         Attachments: derby-3083-01-requireDerbynet-aa.diff, derby-3083-01-requireDerbynet-ab.diff,
> The network server will not start if the derbynet jar is added under a different name
than "derbynet.jar" to the classpath. This makes it impossible to use it in maven projects
where the jar is renamed to "derbynet-".
> This did work with

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