Ensure sshd MACs are configured

中レベル 1自動linux

説明

This variable limits the types of MAC algorithms that SSH can use during communication. Notes: • Some organizations may have stricter requirements for approved MACs. • Ensure that MACs used are in compliance with site policy. • The only "strong" MACs currently FIPS 140 3 approved are: o hmac-sha2-256-etm@openssh.com o hmac-sha2-512-etm@openssh.com o hmac-sha2-256 o hmac-sha2-512

チェック方法

監査方法: シェルコマンド

shell

alt0() { o=$(bash -c 'sshd -T | grep -Pi -- '"'"'macs\h+([^#\n\r]+,)?(hmac-md5|hmac-md5-96|hmac-sha1- 96|umac-64@openssh.com|hmac-md5-etm@openssh.com|hmac-md5-96- etm@openssh\.com|hmac-sha1-etm@openssh\.com|hmac-sha1-96- etm@openssh\.com|umac-64-etm@openssh\.com|umac-128-etm@openssh\.com)\b'"'"'' 2>/dev/null); [ -z "$o" ] || { echo "step1: $o" | head -c 300; return 1; }; }; if alt0; then echo compliant; fi

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

Note: • First occurrence of an option takes precedence. • Though MACs may be configured through the MACs option in the /etc/ssh/sshd_config file, it is recommended that the MACs available to openSSH server are configured through system-wide-crypto-policy • If the recommendations in the subsection "Configure system wide crypto policy" have been followed, this Audit should be in a passing state. Please review that section before following this Remediation Procedure • By default, system-wide-crypto-policy is applied to the openSSH server. If the following defaults don't exist due to modifications or upgrade from a earlier release, the system-wide-crypto-policy may not be included by the openSSH…

プロパティ

オペレーティングシステム: rhel-10
タグ: cis-convertedlinux
参照: CIS Red Hat Enterprise Linux 10 Benchmark v1.0.1 - 5.1.15

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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 linux