Ensure 'log_hostname' is set correctly

LowLevel 1Automatedpostgres

Description

Enabling the log_hostname setting causes the hostname of the connecting host to be logged in addition to the host's IP address for connection log messages. Disabling the setting causes only the connecting host's IP address to be logged, and not the hostname. Runs psql as ${PGUSER:-postgres} against ${PGDATABASE:-postgres}; set PGHOST/PGPORT and use ~/.pgpass (not PGPASSWORD, see 1.6/1.7) when peer authentication is not available.

How it is checked

Audit method: SQL query

sql_query

out=$(psql -X -U "${PGUSER:-postgres}" -d "${PGDATABASE:-postgres}" -tAc "SHOW log_hostname" 2>/dev/null) || exit 1; printf '%s\n' "$out"

Expected output: off

How it is fixed

Fix method: SQL statement

shell

psql -X -U "${PGUSER:-postgres}" -c "ALTER SYSTEM SET log_hostname = 'off'" -c "SELECT pg_reload_conf()"

Properties

Operating systems: Any
Tags: postgresdatabaselogging
Reference: CIS PostgreSQL 18 Benchmark v1.0.0 - 3.1.23 Ensure 'log_hostname' is set correctly

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target postgres