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From "Thomas Hill (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4551) Allow database user to execute stored procedures with same permissions as database owner and/or routine definer
Date Fri, 22 Jul 2011 19:42:58 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13069693#comment-13069693
] 

Thomas Hill commented on DERBY-4551:
------------------------------------

I hope it is okay to add comments to a resolved issue... 
One use case I just came accross is that I would need to know in the SQL code inside the procedure
defined with External Security Definer the role that had been set for the session user prior
to calling the procedure - so a "SESSION_ROLE" which implements for CURRENT_ROLE what SESSION_USER
does for CURRENT_USER. Would this make sense to implement? or is there another way to achieve
this?

> Allow database user to execute stored procedures with same permissions as database owner
and/or routine definer
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-4551
>                 URL: https://issues.apache.org/jira/browse/DERBY-4551
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.0.2.0, 10.0.2.1, 10.1.1.0, 10.1.2.1, 10.1.3.1, 10.2.1.6, 10.2.2.0,
10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3, 10.4.2.0, 10.5.1.1, 10.5.2.0, 10.5.3.0, 10.6.1.0
>            Reporter: Tushar Kale
>            Assignee: Dag H. Wanvik
>             Fix For: 10.7.1.1
>
>         Attachments: definers_rights.html, definers_rights.html, definers_rights.html,
definers_rights.html, definers_rights.html, definers_rights.html, definers_rights.html, definers_rights_typos-1.diff,
derby-4551-1.diff, derby-4551-1.stat, derby-4551-1.txt, derby-4551-2.diff, derby-4551-2.stat,
derby-4551-3.diff, derby-4551-3.stat, derby-4551-3b.diff, derby-4551-3b.stat, derby-4551-4.diff,
derby-4551-4.stat, derby-4551-followup-1a.diff, derby-4551-followup-1a.stat, derby-4551-followup-1b.diff,
derby-4551-followup-1b.stat, derby4551-trial.diff, reproTH-derby-4551.7z
>
>
> Curretnly there is no way to hide data and database structure in embedded derby from
the end user. 
> One way to accomplish the above requirement is as follows:
> 1. Create encrypted database so data is protected
> 2. Enable authentication and sql authorization in database
> 3. Create two users, dbUser and dbOwner
> 4. Store application logic as stored procedure in the databse so dbUser does not know
what tables are accecced by the application logic, thus hiding table structure
> 5. Revoke select permission from dbUser so he cannot describe tables thus protecting
table structures
> 6. Give only Execute permissions on stored procedures to dbUser
> The above steps will ensure that data and data structure is hidden when application is
delivered to end user.
> The problem is, if user does not have select permission, the stored procedures will not
execute. So I am requesting the following enhancement to Derby:
> If dbOwner has given Execure permission to stored procecure to a dbUser, then allow stored
procedure to execute even if the dbUser has no select permission. 
> In otherwords, When dbUser calls stored procedure, database will use dbOwners authorization
to execute stored procedure rather than dbUsers.  
> This may be implemented by creating new permission called RunAsDbOwner.
> DbOwner can then grant permission to dbUser  to execute a stored procedure with RunAsDbOwner.
> If this is implemented, applications can be created which will truely hide the database
structure and data from end users. Database will behave as a blackbox with only in/out data
exposed in stored procedures.

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