Local Host Security? All users should have passwords optionally...

Ivn Baldo (ivan(dot)baldo(at)pilasnet(dot)com) reports a bug with a severity of 2
The lower the number the more severe it is.

Short Description
Local Host Security? All users should have passwords optionally...

Long Description
I wanted to add passwords to all the users on the database, including the postgres user, etc. Then everything is authenticated using "crypt" method, so it asks passwords EVERYTIME.
The problem I found is that I cannot do a "pg_dumpall" anymore, since I have no way to tell it to use the "postgres" user with a given password. It tries to use the user "root" without password and it fails miserably!
What happens if a hacker (or worst, a cracker!) enters to the machine somehow and I don't ask passwords for unix domain sockets? Well, it has access to all my data... Ok, this should not happen, but I worry if it happens and I think it is important to enforce the security a little more in Postgres. The documentation doesn't say anything about this...

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