Security with PostgreSQL - Mailing list pgsql-advocacy

Hi ,

I have questions, described above, about Security with postgreSQL :

Security:

To analyse PostgreSQL through the following 3 requirements:

1. Authentication
    integration with existing authentication such as Windows, Kerberos,
etc.

2. Authorisation
    How does the app/db restrict access rights to certain group of users

3. Accountability
    Audit trail - linking users to all transactions.

Thanks for your quick answer.
Rds,
Serge Perrier