Ensure File Key Management Encryption Plugin files have appropriate permissions

HighLevel 1Automatedmariadb

Description

Certain Key Management Encryption plugins must store sensitive information in files for later retrieval. Such files should have proper permissions. Reads file_key_management_filename/filekey from the server option groups; fails when the plugin is not configured or a key file is not mysql:mysql with mode 750 or stricter.

How it is checked

Audit method: Shell command

shell

c=$(my_print_defaults --mysqld 2>/dev/null) || exit 1; fn=$(printf '%s\n' "$c" | sed -n 's/^--file[-_]key[-_]management[-_]filename=//p' | tail -n 1); fk=$(printf '%s\n' "$c" | sed -n 's/^--file[-_]key[-_]management[-_]filekey=//p' | tail -n 1); [ -n "$fn" ] || { echo "file_key_management not configured"; exit 0; }; [ -f "$fn" ] || { echo "missing $fn"; exit 0; }; n=0; for x in "$fn" "${fk#FILE:}"; do [ -n "$x" ] && [ -f "$x" ] || continue; s=$(stat -c '%a %U %G' "$x"); m=${s%% *}; [ "${s#* }" = "mysql mysql" ] && [ $((0$m & 027)) -eq 0 ] || 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

chmod 750 <file> (or stricter, e.g. 640/600) && chown mysql:mysql <file> for file_key_management_filename and a FILE: file_key_management_filekey; if the plugin is not configured, implement data-at-rest encryption first (4.9).

Properties

Operating systems: Any
Tags: mariadbdatabasefilesystempermissionsencryption
Reference: CIS MariaDB 10.11 Benchmark v1.0.0 - 3.10 Ensure File Key Management Encryption Plugin 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