Linux distributions
TMA-UBUNTU2004-6.3.4.1
Ensure audit log files mode is configured
低レベル 2自動linux
説明
Audit log files contain information about the system and system activity.
チェック方法
監査方法: シェルコマンド
shell
alt0() { o=$(bash -c '#!/usr/bin/env bash
{
l_perm_mask="0137"
if [ -e "/etc/audit/auditd.conf" ]; then
l_audit_log_directory="$(dirname "$(awk -F= '"'"'/^\s*log_file\s*/{print $2}'"'"' /etc/audit/auditd.conf | xargs)")"
if [ -d "$l_audit_log_directory" ]; then
l_maxperm="$(printf '"'"'%o'"'"' $(( 0777 & ~$l_perm_mask )) )"
a_files=()
while IFS= read -r -d $'"'"'\0'"'"' l_file; do
[ -e "$l_file" ] && a_files+=("$l_file")
done < <(find "$l_audit_log_directory" -maxdepth 1 -type f -perm /"$l_perm_mask" -print0)
if (( "${#a_files[@]}" > 0 )); then
for l_file in "${a_files[@]}"; do
l_file_mode="$(stat -Lc '"'"'%#a'"'"' "$l_file")"
echo -e "\n- Audit Result:\n ** FAIL **\n - File: \"$l_file\" is mode: \"$l_file_mode\"\n (should be mode: \"$l_maxperm\" or more restrictive)\n"
done
else
echo -e "\n- Audit Result:\n ** PASS **\n - All files in \"$l_audit_log_directory\" are mode: \"$l_maxperm\" or more restrictive"
fi
else
echo -e "\n- Audit Result:\n ** FAIL **\n - Log file directory not set in \"/etc/audit/auditd.conf\" please set log file directory"
fi
else
echo -e "\n- Audit Result:\n ** FAIL **\n - File: \"/etc/audit/auditd.conf\" not found.\n - ** Verify auditd is installed **"
fi
}' 2>&1); printf '%s\n' "$o" | grep -q '\*\* PASS \*\*' || { echo "step1: script did not report PASS"; return 1; }; }; if alt0; then echo compliant; fi- 期待される出力
compliant
修正方法
修正方法: ガイダンスまたは IaC パッチ
Run the following command to remove more permissive mode than 0640 from audit log files: # [ -f /etc/audit/auditd.conf ] && find "$(dirname $(awk -F "=" '/^\s*log_file/ {print $2}' /etc/audit/auditd.conf | xargs))" -type f -perm /0137 -exec chmod u-x,g-wx,o-rwx {} +
プロパティ
- オペレーティングシステム
- ubuntu-20.04
- タグ
- cis-convertedlinux
- 参照
- CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 - 6.3.4.1
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 linux --level 2