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Re: column level privileges

From: Andrew Dunstan <andrew(at)dunslane(dot)net>
To: sanjay sharma <sanksh(at)hotmail(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: column level privileges
Date: 2008-04-02 02:02:30
Message-ID: 47F2E936.9000509@dunslane.net (view raw or flat)
Thread:
Lists: pgsql-hackers

The earliest will be 8.4, which is many many months away.

It should be possible to produce a patch for 8.3 if you're interested.

cheers

andrew

sanjay sharma wrote:
> Hello Andrew,
>  
> When do you expect this patch to go in production and available for 
> public use? I would keep an eye for its release.
>  
> Sanjay Sharma
>
> > Date: Tue, 1 Apr 2008 18:40:24 -0400
> > From: andrew(at)dunslane(dot)net
> > To: pgsql-hackers(at)postgresql(dot)org
> > Subject: [HACKERS] column level privileges
> >
> >
> > Apologies if this gets duplicated - original seems to have been dropped
> > due to patch size - this time I am sending it gzipped.
> >
> > cheers
> >
> > andrew
> >
> > -------- Original Message --------
> > Subject: column level privileges
> > Date: Tue, 01 Apr 2008 08:32:25 -0400
> > From: Andrew Dunstan <andrew(at)dunslane(dot)net>
> > To: Patches (PostgreSQL) <pgsql-patches(at)postgresql(dot)org>
> >
> >
> >
> > This patch by Golden Lui was his work for the last Google SoC. I was 
> his
> > mentor for the project. I have just realised that he didn't send his
> > final patch to the list.
> >
> > I guess it's too late for the current commit-fest, but it really needs
> > to go on a patch queue (my memory on this was jogged by Tom's recent
> > mention of $Subject).
> >
> > I'm going to see how much bitrot there is and see what changes are
> > necessary to get it to apply.
> >
> > cheers
> >
> > andrew
> >
> >
> > -------------
> > Here is a README for the whole patch.
> >
> > According to the SQL92 standard, there are four levels in the privilege
> > hierarchy, i.e. database, tablespace, table, and column. Most 
> commercial
> > DBMSs support all the levels, but column-level privilege is hitherto
> > unaddressed in the PostgreSQL, and this patch try to implement it.
> >
> > What this patch have done:
> > 1. The execution of GRANT/REVOKE for column privileges. Now only
> > INSERT/UPDATE/REFERENCES privileges are supported, as SQL92 specified.
> > SELECT privilege is now not supported. This part includes:
> > 1.1 Add a column named 'attrel' in pg_attribute catalog to store
> > column privileges. Now all column privileges are stored, no matter
> > whether they could be implied from table-level privilege.
> > 1.2 Parser for the new kind of GRANT/REVOKE commands.
> > 1.3 Execution of GRANT/REVOKE for column privileges. Corresponding
> > column privileges will be added/removed automatically if no column is
> > specified, as SQL standard specified.
> > 2. Column-level privilege check.
> > Now for UPDATE/INSERT/REFERENCES privilege, privilege check will be
> > done ONLY on column level. Table-level privilege check was done in the
> > function InitPlan. Now in this patch, these three kind of privilege are
> > checked during the parse phase.
> > 2.1 For UPDATE/INSERT commands. Privilege check is done in the
> > function transformUpdateStmt/transformInsertStmt.
> > 2.2 For REFERENCES, privilege check is done in the function
> > ATAddForeignKeyConstraint. This function will be called whenever a
> > foreign key constraint is added, like create table, alter table, etc.
> > 2.3 For COPY command, INSERT privilege is check in the function
> > DoCopy. SELECT command is checked in DoCopy too.
> > 3. While adding a new column to a table using ALTER TABLE command, set
> > appropriate privilege for the new column according to privilege already
> > granted on the table.
> > 4. Allow pg_dump and pg_dumpall to dump in/out column privileges.
> > 5. Add a column named objsubid in pg_shdepend catalog to record ACL
> > dependencies between column and roles.
> > 6. modify the grammar of ECPG to support column level privileges.
> > 7. change psql's \z (\dp) command to support listing column privileges
> > for tables and views. If \z(\dp) is run with a pattern, column
> > privileges are listed after table level privileges.
> > 8. Regression test for column-level privileges. I changed both
> > privileges.sql and expected/privileges.out, so regression check is now
> > all passed.
> >
> > Best wishes
> > Dong
> > --
> > Guodong Liu
> > Database Lab, School of EECS, Peking University
> > Room 314, Building 42, Peking University, Beijing, 100871, China
> >
> >
>
>
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