Ensure private key permissions are restricted

HochStufe 1Automatisiertnginx

Beschreibung

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.

So wird geprüft

Prüfmethode: Shell-Befehl

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; }

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

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

Eigenschaften

Betriebssysteme: Beliebig
Tags: nginxtlspermissions
Referenz: CIS NGINX Benchmark v3.0.0 - 4.1.3 Ensure private key permissions are restricted

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shell

tmaegis scan --target nginx