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From "Kathey Marsden (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5363) Tighten default permissions of DB files with >= JDK6
Date Fri, 30 Sep 2011 15:09:45 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118121#comment-13118121
] 

Kathey Marsden commented on DERBY-5363:
---------------------------------------

The release note does not mention the difference in behavior for different JVM's but is my
understanding correct?

- java 5 and lower there is no change in behavior.
- java 6 some operating systems change and some don't.  Also we cannot test on any platform
for java 6
- java 7 All platforms  change.

If this summary is correct, I think perhaps we should only have the new behavior with java
7.  If we can't test it on java 6 we won't know if there are jvm bugs or derby code changes
that break it.  Also it is confusing that some platforms are affected and some aren't.  Lastly
I think it is very clear and more appropriate to introduce a new behavior with a new JVM.
Applications will test more rigorously on  a JVM upgrade and hopefully any associated problems
will be caught early.
 

                
> Tighten default permissions of DB files with >= JDK6
> ----------------------------------------------------
>
>                 Key: DERBY-5363
>                 URL: https://issues.apache.org/jira/browse/DERBY-5363
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous, Services, Store
>            Reporter: Dag H. Wanvik
>            Assignee: Dag H. Wanvik
>         Attachments: derby-5363-basic-1.diff, derby-5363-basic-1.stat, derby-5363-basic-2.diff,
derby-5363-basic-2.stat, derby-5363-basic-3.diff, derby-5363-basic-3.stat, derby-5363-full-1.diff,
derby-5363-full-1.stat, derby-5363-full-2.diff, derby-5363-full-2.stat, derby-5363-full-3.diff,
derby-5363-full-3.stat, derby-5363-full-4.diff, derby-5363-full-4.stat, derby-5363-full-5.diff,
derby-5363-full-5.stat, derby-5363-server-1.diff, permission-5.diff, permission-5.stat, permission-6.diff,
permission-6.stat, property-table.png, releaseNote.html, releaseNote.html, releaseNote.html,
releaseNote.html, z.sql
>
>
> Before Java 6, files created by Derby would have the default
> permissions of the operating system context. Under Unix, this would
> depend on the effective umask of the process that started the Java VM.
> In Java 6 and 7, there are methods available that allows tightening up this
> (File.setReadable, setWritable), making it less likely that somebody
> would accidentally run Derby with a too lenient default.
> I suggest we take advantage of this, and let Derby by default (in Java
> 6 and higher) limit the visibility to the OS user that starts the VM,
> e.g. on Unix this would be equivalent to running with umask 0077. More
> secure by default is good, I think.
> We could have a flag, e.g. "derby.storage.useDefaultFilePermissions"
> that when set to true, would give the old behavior.

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