Ensure only modern TLS protocols are used

高レベル 1自動nginx

説明

Only modern TLS protocols should be enabled in NGINX for all client connections and upstream connections. Removing legacy TLS and SSL protocols (SSL 3.0, TLS 1.0, 1.1 and 1.2), and enable stable TLS protocols (TLS 1.3), ensures users are able to take advantage of strong security capabilities and protects them from insecure legacy protocols. Every ssl_protocols (and proxy_ssl_protocols) directive must be exactly TLSv1.3, at least one ssl_protocols must exist, and when proxy_pass https:// is used proxy_ssl_protocols must be set. 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 '{l=$0; o=""; q=""; for(i=1;i<=length(l);i++){c=substr(l,i,1); if(q!=""){o=o c; if(c==q) q=""; continue} if(c=="\""||c=="\047"){q=c; o=o c; continue} if(c=="#") break; if(c==";"||c=="{"){print o c; o=""; continue} if(c=="}"){if(o~/[^[:space:]]/) print o; print "}"; o=""; continue} o=o c} if(o~/[^[:space:]]/) print o}' | awk 'function a(i,  x){x=$i; sub(/;$/,"",x); gsub(/["\047]/,"",x); return x} function inb(n,  i){for(i=1;i<=sp;i++) if(st[i]==n) return 1; return 0} $1=="ssl_protocols"{n++; if(NF!=2 || a(2)!="TLSv1.3") bad=1} $1=="proxy_ssl_protocols"{pp=1; if(NF!=2 || a(2)!="TLSv1.3") bad=1} $1=="proxy_pass" && a(2)~/^https:/ {hp=1} {o=gsub(/\{/,"{"); c=gsub(/\}/,"}"); while(o-->0){sp++; b=$1; sub(/\{.*/,"",b); st[sp]=b} while(c-->0 && sp>0) sp--} END{print (n>0&&!bad&&(!hp||pp))?"compliant":"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

Set 'ssl_protocols TLSv1.3;' in the http/server blocks and 'proxy_ssl_protocols TLSv1.3;' where proxying to TLS upstreams. Then run nginx -t and reload nginx.

プロパティ

オペレーティングシステム: すべて
タグ: nginxtls
参照: CIS NGINX Benchmark v3.0.0 - 4.1.4 Ensure only modern TLS protocols are used

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