Goal PostgreSQL gives by default some privileges to all the present and future database users (PUBLIC). Find usage privileges of collations, domains, foreign data wrappers, foreign servers, and sequences that have been given to PUBLIC.
Type Problem detection (Each row in the result could represent a flaw in the design)
Reliability High (Few or no false-positive results)
License MIT (opens in new tab)
Fixing Suggestion Revoke the usage privileges from PUBLIC.
Data Source INFORMATION_SCHEMA+system catalog
SQL Query 
SELECT object_schema, object_name, object_type
FROM INFORMATION_SCHEMA.usage_privileges
WHERE grantee='PUBLIC'
AND object_schema NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
UNION SELECT n.nspname AS type_schema, 
t.typname AS type_name,
CASE WHEN typtype='e' THEN 'ENUMERATION TYPE'
WHEN typtype='r' THEN 'RANGE TYPE'
WHEN typtype='m' THEN 'MULTIRANGE TYPE' END AS type_type
FROM pg_type AS t INNER JOIN pg_namespace AS n ON t.typnamespace=n.oid
WHERE (array_to_string(typacl,',') IS NULL
OR array_to_string(typacl,',') LIKE '%,=U/%')
AND typtype IN ('e','r','m')
AND n.nspname NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
UNION SELECT '-', lanname AS language_name, 'LANGUAGE' AS object_type
FROM pg_language
WHERE lanispl='t'
AND (array_to_string(lanacl,',') IS NULL
OR array_to_string(lanacl,',') LIKE '%,=U/%')
ORDER BY object_type, object_schema, object_name;

SQL statements that help generate fixes for the identified problem.

Fix Action #1
WITH unnecessary_privileges AS (SELECT object_type, object_schema, object_name 
FROM INFORMATION_SCHEMA.usage_privileges
WHERE grantee='PUBLIC'
AND object_schema NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
UNION SELECT 'TYPE' AS object_type,
n.nspname AS type_schema, 
t.typname AS type_name
FROM pg_type AS t INNER JOIN pg_namespace AS n ON t.typnamespace=n.oid
WHERE (array_to_string(typacl,',') IS NULL
OR array_to_string(typacl,',') LIKE '%,=U/%')
AND typtype IN ('e','r','m')
AND n.nspname NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL))
SELECT format('REVOKE USAGE ON %1$s %2$I.%3$I FROM PUBLIC;',  object_type, object_schema, object_name) AS statements
FROM unnecessary_privileges
ORDER BY object_type, object_schema, object_name;

Revoke the usage privileges from PUBLIC.

Fix Action #2
WITH unnecessary_privileges AS (SELECT lanname AS language_name
FROM pg_language
WHERE lanispl='t'
AND (array_to_string(lanacl,',') IS NULL
OR array_to_string(lanacl,',') LIKE '%,=U/%'))
SELECT format('REVOKE USAGE ON LANGUAGE %1$I FROM PUBLIC;', language_name) AS statements
FROM unnecessary_privileges
ORDER BY language_name;

Revoke language USAGE privilege from PUBLIC.

SQL Query to Generate FixDescription
WITH unnecessary_privileges AS (SELECT object_type, object_schema, object_name 
FROM INFORMATION_SCHEMA.usage_privileges
WHERE grantee='PUBLIC'
AND object_schema NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
UNION SELECT 'TYPE' AS object_type,
n.nspname AS type_schema, 
t.typname AS type_name
FROM pg_type AS t INNER JOIN pg_namespace AS n ON t.typnamespace=n.oid
WHERE (array_to_string(typacl,',') IS NULL
OR array_to_string(typacl,',') LIKE '%,=U/%')
AND typtype IN ('e','r','m')
AND n.nspname NOT IN  (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL))
SELECT format('REVOKE USAGE ON %1$s %2$I.%3$I FROM PUBLIC;',  object_type, object_schema, object_name) AS statements
FROM unnecessary_privileges
ORDER BY object_type, object_schema, object_name;
Revoke the usage privileges from PUBLIC.
WITH unnecessary_privileges AS (SELECT lanname AS language_name
FROM pg_language
WHERE lanispl='t'
AND (array_to_string(lanacl,',') IS NULL
OR array_to_string(lanacl,',') LIKE '%,=U/%'))
SELECT format('REVOKE USAGE ON LANGUAGE %1$I FROM PUBLIC;', language_name) AS statements
FROM unnecessary_privileges
ORDER BY language_name;
Revoke language USAGE privilege from PUBLIC.

Collections

This query belongs to the following collections:

Find problems automatically

Queries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

NameDescription
Find problems automaticallyQueries, that results point to problems in the database. Each query in the collection produces an initial assessment. However, a human reviewer has the final say as to whether there is a problem or not .

Categories

This query is classified under the following categories:

Domains

Queries of this category provide information about reusable specifications of column properties.

Security

Queries of this category provide information about the security measures.

NameDescription
DomainsQueries of this category provide information about reusable specifications of column properties.
SecurityQueries of this category provide information about the security measures.