Ensure SSL Key Files Have Appropriate Permissions

HighLevel 1Automatedmariadb

Description

When configured to use SSL/TLS, MariaDB relies on Secure Sockets Layer (SSL) key files, which are stored on the host's filesystem. These SSL key files are subject to the host's permissions and ownership structure. Every file named by an ssl_ca/ssl_cert/ssl_key/ssl_crl variable must be -r-------- mysql:mysql (directories in ssl_capath/ssl_crlpath are skipped). Runs mariadb -NBe with the client defaults: as root on the server the unix_socket plugin usually authenticates; otherwise put an administrative account in ~/.my.cnf (mode 0600), not MYSQL_PWD (see 1.4/1.6).

How it is checked

Audit method: Shell command

shell

[ "$(id -u)" -eq 0 ] || exit 1; d=$(mariadb -NBe "SELECT @@global.datadir" 2>/dev/null) || exit 1; l=$(mariadb -NBe "SELECT VARIABLE_VALUE FROM information_schema.GLOBAL_VARIABLES WHERE LOWER(VARIABLE_NAME) REGEXP '^.*ssl_(ca|capath|cert|crl|crlpath|key)\$' AND VARIABLE_VALUE <> ''" 2>/dev/null) || exit 1; n=0; for f in $l; do case "$f" in /*) ;; *) f="$d/${f#./}" ;; esac; [ -f "$f" ] || continue; [ "$(stat -c '%a %U %G' "$f")" = "400 mysql mysql" ] || n=$((n+1)); done; [ "$n" -eq 0 ] && echo compliant || echo "$n noncompliant files"

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

chown mysql:mysql <ssl_file> && chmod 400 <ssl_file> for every ssl_ca/ssl_cert/ssl_key/ssl_crl file in use.

Properties

Operating systems: Any
Tags: mariadbdatabasefilesystempermissionstls
Reference: CIS MariaDB 10.11 Benchmark v1.0.0 - 3.7 Ensure SSL Key Files Have Appropriate Permissions

Check this host

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

shell

tmaegis scan --target mariadb