TMA-NGINX-4.1.3

Ensure private key permissions are restricted

高レベル 1自動nginx

説明

The server's and potentially its vhost's private keys should be protected from unauthorized access by limiting access based on the principle of least privilege. Every ssl_certificate_key and every *.key file under /etc/nginx must have mode 400 or stricter (relative paths are resolved against /etc/nginx; variables and engine: keys are skipped). Evaluated on the merged configuration printed by `nginx -T` (all included files; needs permission to read them). CIS marks this recommendation Manual; the automated check implements its audit procedure.

チェック方法

監査方法: シェルコマンド

shell

out=$(nginx -T 2>/dev/null) || exit 1; { printf '%s\n' "$out" | awk '$1=="ssl_certificate_key"{v=$2; sub(/;$/,"",v); gsub(/["\047]/,"",v); print v}'; find /etc/nginx -name '*.key' 2>/dev/null; } | sort -u | { bad=0; while IFS= read -r k; do case "$k" in data:*|engine:*|store:*|*'$'*) continue;; /*) ;; *) k=/etc/nginx/$k;; esac; [ -e "$k" ] || continue; [ -z "$(find -L "$k" -perm /377)" ] || bad=1; done; [ "$bad" = 0 ] && echo compliant || echo noncompliant; }

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

find /etc/nginx/ -name '*.key' -exec chmod u-wx,go-rwx {} + (and the same for keys stored elsewhere).

プロパティ

オペレーティングシステム: すべて
タグ: nginxtlspermissions
参照: CIS NGINX Benchmark v3.0.0 - 4.1.3 Ensure private key permissions are restricted

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target nginx