Re: Deny access materialzsed view

[DÃster Horst <Horst.Duester@xxxxxxxx>]

Hi Szymon Guz 

 

Thanks a lot for your response. I think the SECURITY DEFINER doesn't solve my problem. Here an example (stupid I know but just for explanation):

 

1. I have created the view  myView (select id from myTable) with an insert rule and I have created a table myTable (id integer, time timestamp).

2. Now I add a record to myView with: insert into myView (id) values (1).

3. The insert rule adds the value of id to myTable and sets a timestamp additionally

 

My problem now is that all users which have write access to myView shoudn't have write access to myTable to avoid manipulations of myTable apart from the logic of the myView rule. In the present configuration they must have write access to myTable for inserting data at the moment. Only the db admin should have write access to myTable and nobody else. Additionally in this approach there is no function. As the result I can't use the SECURITY DEFINER statement. As I understand does the SECURITY DEFINER statement only modify the execution rights of a function.

 

Maybe you have further hints or ideas?

 

Regards

Horst

------------------------------------------------

Dr. Horst Düster
Stv. Amtschef / kantonaler GIS-Koordinator

Kanton Solothurn
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-----Ursprüngliche Nachricht-----
Von: Szymon Guz [mailto:mabewlun@xxxxxxxxx]
Gesendet am: Mittwoch, 24. November 2010 09:17
An: Düster Horst
Cc: pgsql-admin
Betreff: Re: Deny access materialzsed view

On 24 November 2010 08:57, Düster Horst <Horst.Duester@xxxxxxxx> wrote:

Hi

I created a materialized view to manage editings via a real postgres view. The view has some rules to deliver all inserts, updates and deletes to the underlaying table with the appropriate privileges, insert, update and delete, for members of an editing role. To avoid editings on the underlaying table I want to deny any access except select access to the table for all users. Does anyone outside has an idea how to manage the described situation?

I'll appreciate any hint.

Regards

Horst

-

Hi,

I'd use the security definer/invoker mechanism (http://www.postgresql.org/docs/9.0/interactive/sql-createfunction.html). This way you could create special user who is the owner of the rule functions, and can read/write to the table, and normal user, who cannot read/write to the table, but can run those functions.

regards

Szymon Guz