how to check the privileges assigned to a role in postgresql

 SELECT table_catalog, table_schema, table_name, privilege_type FROM information_schema.table_privileges 

WHERE grantee = 'MY_USER'

SELECT grantee,table_catalog, table_schema, table_name, privilege_type
FROM   information_schema.table_privileges 
WHERE  grantee not in ('pg_monitor','PUBLIC');

select list of roles in postgresql:

SELECT rolname FROM pg_roles;

locate HBA files

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SELECT name, setting
FROM pg_settings WHERE name LIKE '%hba%';

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To check user having password:

select usename,passwd from pg_shadow where passwd IS NOT NULL

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