Re: [GENERAL] logging of application level user in audit trigger

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От Scott Mead
Тема Re: [GENERAL] logging of application level user in audit trigger
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Msg-id CAKq0gv+wqDv6cmF__XR1sEY3wun0V2FQ4HenG+Ec073xOU394Q@mail.gmail.com
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Ответ на [GENERAL] logging of application level user in audit trigger  (Rajesh Mallah <mallah.rajesh@gmail.com>)
Ответы Re: [GENERAL] logging of application level user in audit trigger
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On Tue, May 9, 2017 at 2:50 PM, Rajesh Mallah <mallah.rajesh@gmail.com> wrote:

Although there are documented limitations for these systems , but
I would like to mention and seek suggestion on a limitation that I feel is biggest .


It is very a common design pattern in  web-applications that the same database
user is shared for making database changes by different "logged in users" of the
web application.

I feel the core of audit is all about "who"  , "when" and "what" .

In the current audit trigger the "who" is essentially the ROLE which is the actor of
the trigger , but in most scenarios the user associated with the web-application session
is the one that is seeked.

In one of my past projects I passed the web-user to the trigger by setting a postgres
custom variable during the database connection and reading it inside the trigger
and storing it in the audit log table.

This is a good method, and one of the best for just straight auditing.  The other trick I've seen is to use the 'application_name' field.  Developers would issue:

SET application_name = "app_user:app_name'; 

This can be read from pg_stat_activity.application_name.  I believe you'd be able to read that in a procedure with 'show application_name'; and, you can see it live in pg_stat_activity as well.

select application_name, count(*) 
  FROM pg_stat_activity 
 GROUP by application_name; 

  You'd be able to see each user/app pair and the number of sessions that were using to the DB at a given time.  

--Scott

 

I am curious how others deal with the same issue , is there better or more inbuilt solutions
to store the application level user in the audit trail records.

Regds
mallah.









 



--
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Scott Mead
Sr. Architect
OpenSCG

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