Ensure the Replication User Has Minimal Privileges

HighLevel 1Automatedtdsql

Description

The replication-dedicated account (tdsqlsys_repl) should hold only the minimum privileges necessary for replication. Runs the mysql client against the TDSQL data node selected by TDSQL_MYSQL_OPTS (e.g. "-h10.0.0.5 -P4001 -utdsql_audit"); keep the password in ~/.my.cnf or a login path rather than MYSQL_PWD or the command line (see 1.4 and 1.5). Counts grant lines for 'tdsqlsys_repl'@'%' that contain anything other than REPLICATION SLAVE / REPLICATION CLIENT (or USAGE) on *.*.

How it is checked

Audit method: SQL query

sql_query

out=$(mysql ${TDSQL_MYSQL_OPTS:-} -NBe "SHOW GRANTS FOR 'tdsqlsys_repl'@'%'" 2>/dev/null) || exit 1; printf '%s\n' "$out" | grep -vcE '^GRANT (USAGE|REPLICATION SLAVE|REPLICATION CLIENT)(, (REPLICATION SLAVE|REPLICATION CLIENT))* ON \*\.\* TO ' || true

Expected output: 0

How it is fixed

Fix method: Guidance or infrastructure patch

REVOKE ALL PRIVILEGES ON *.* FROM 'tdsqlsys_repl'@'%'; GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'tdsqlsys_repl'@'%'; (coordinate with the TDSQL Manager, which manages this account).

Properties

Operating systems: Any
Tags: tdsqlprivilegesreplication
Reference: CIS Tencent TDSQL 10.3.22 Benchmark v1.0.0 - 10.2 Ensure the Replication User Has Minimal Privileges

Check this host

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

shell

tmaegis scan --target tdsql