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From "Satheesh Bandaram (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-464) Enhance Derby by adding grant/revoke support. Grant/Revoke provide finner level of privileges than currently provided by Derby that is especially useful in network configurations.
Date Mon, 12 Dec 2005 04:29:10 GMT
    [ http://issues.apache.org/jira/browse/DERBY-464?page=comments#action_12360186 ] 

Satheesh Bandaram commented on DERBY-464:

I have submitted Grant and Revoke, Part I to trunk. Let me know if anyone would like to join
developing remaining parts. It is possible to coordinate development using a Wiki. 

This Phase I implements:

  * Grant/Revoke DDL parsing and execution
  * Addition of several new system tables to hold the system metadata. I will update my spec
to include detailed schema for new system tables, so that they can be included in 10.2 documentation.
  *  Enhancing the syntax for routine creation to include external-security clause
  *  Very simple tests to cover only the DDL. I would be expanding on the testing in the later
submissions, including a JUnit test suite.
  * Grant/Revoke DDL is only supported if derby.database.defaultConnectionMode property is
set to 'sqlStandard'.

Pending items from Phase I:

   1. dblook needs to be enhanced to emit DDL for grant statements.
   2. Enhanced JUnit based test suite with many more tests. 
   3. Some implementation improvements possible with the current patch. It should be possible
to combine several new nodes being added, to reduce number of nodes and hence foot print.
Also, the patch adds a Java object to new system tables. While Derby already has some java
objects in its system tables, I think, we should discourage adding new java objects to catalogs.
Since Java objects can't be used in SQL easily, this makes metadata harder to use. I will
explore rewriting SYSCOLPERMS and SYSREQUIREDPERM to not use FormattableBitSet type. This
can be done by having multiple entries in these catalogs for each column referenced.
   4. Updating specification to include schema for new system tables.
   5. Need to change how property defaultConnectionMode is set and/or used.
   6. Enhance system tables to store external security clause specification.

I am also working on Grant and Revoke, Phase II. This will implement permission checking for
DML statement. Hopefully I will have something to submit by end of January to complete Phase
I and Phase II.

Also need to support upgrade and migration of legacy databases and update JDBC metadata.

Let me know if I missed anything else.

> Enhance Derby by adding grant/revoke support. Grant/Revoke provide finner level of privileges
than currently provided by Derby that is especially useful in network configurations.
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>          Key: DERBY-464
>          URL: http://issues.apache.org/jira/browse/DERBY-464
>      Project: Derby
>         Type: New Feature
>   Components: SQL
>     Versions:,,
>  Environment: generic
>     Reporter: Satheesh Bandaram
>     Assignee: Satheesh Bandaram
>  Attachments: grant.html, grantRevoke.patch.Dec5, grantRevoke.stat.Dec5
> Derby currently provides a very simple permissions scheme, which is quite suitable for
an embedded database system. End users of embedded Derby do not see Derby directly; they talk
to a application that embeds Derby. So Derby left most of the access control work to the application.
Under this scheme, Derby limits access on a per database or per system basis. A user can be
granted full, read-only, or no access. 
> This is less suitable in a general purpose SQL server. When end users or diverse applications
can issue SQL commands directly against the database, Derby must provide more precise mechanisms
to limit who can do what with the database.
> I propose to enhance Derby by implementing a subset of grant/revoke capabilities as specified
by the SQL standard. I envision this work to involve the following tasks, at least:
> 1) Develop a specification of what capabilities I would like to add to Derby.
> 2) Provide a high level implementation scheme.
> 3) Pursue a staged development plan, with support for DDL added to Derby first.
> 4) Add support for runtime checking of these privileges.
> 5) Address migration and upgrade issues from previous releases and from old scheme to
newer database.
> Since I think this is a large task, I would like to invite any interested people to work
with me on this large and important enhancement to Derby.

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