Ensure /etc/motd is configured

中レベル 1自動linux

説明

The contents of the /etc/motd file are displayed to users after login and function as a message of the day for authenticated users. Unix-based systems have typically displayed information about the OS release and patch level upon logging in to the system. This information can be useful to developers who are developing software for a particular OS platform. If mingetty(8) supports the following options, they display operating system information: \m - machine architecture \r - operating system release \s - operating system name \v - operating system version

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_output="" l_output2=""
   a_files=()
   for l_file in /etc/motd{,.d/*}; do
      if grep -Psqi -- "(\\\v|\\\r|\\\m|\\\s|\b$(grep ^ID= /etc/os-release | cut -d= -f2 | sed -e '"'"'s/"//g'"'"')\b)" "$l_file"; then
         l_output2="$l_output2\n - File: \"$l_file\" includes system information"
      else
         a_files+=("$l_file")
      fi
   done
   if [ "${#a_files[@]}" -gt 0 ]; then
      echo -e "\n-  ** Please review the following files and verify their contents follow local site policy **\n"
      printf '"'"'%s\n'"'"' "${a_files[@]}"
   elif [ -z "$l_output2" ]; then
      echo -e "- ** No MOTD files with any size were found. Please verify this conforms to local site policy ** -"
   fi
   if [ -z "$l_output2" ]; then
      l_output=" - No MOTD files include system information"
      echo -e "\n- Audit Result:\n  ** PASS **\n$l_output\n"
   else
      echo -e "\n- Audit Result:\n  ** FAIL **\n - Reason(s) for audit failure:\n$l_output2\n"
   fi
}' 2>&1); printf '%s\n' "$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

Edit the file found in /etc/motd.d/* with the appropriate contents according to your site policy, remove any instances of \m , \r , \s , \v or references to the OS platform - OR - - IF - the motd is not used, this file can be removed. Run the following command to remove the motd file: # rm /etc/motd Run the following script and review and/or update all returned files' contents to: • Remove all system information (\v, \r; \m, \s) • Remove any refence to the operating system • Ensure contents follow local site policy #!/usr/bin/env bash { a_files=() for l_file in /etc/motd{,.d/*}; do if grep -Psqi -- "(\\\v|\\\r|\\\m|\\\s|\b$(grep ^ID= /etc/os-release | cut -d= -f2 | sed -e 's/"//g')\b)" "$l_f…

プロパティ

オペレーティングシステム: almalinux-8
タグ: cis-convertedlinux
参照: CIS AlmaLinux OS 8 Benchmark v4.0.0 - 1.7.1

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shell

tmaegis scan --target linux