Ensure changes to system administration scope (sudoers) is collected

낮음레벨 2자동linux

설명

Monitor scope changes for system administrators. If the system has been properly configured to force system administrators to log in as themselves first and then use the sudo command to execute privileged commands, it is possible to monitor changes in scope. The file /etc/sudoers, or files in /etc/sudoers.d, will be written to when the file(s) or related attributes have changed. The audit records will be tagged with the identifier "scope".

점검 방법

감사 방식: 셸 명령

shell

alt0() { o=$(bash -c 'awk '"'"'/^ *-w/ &&/\/etc\/sudoers/ &&/ +-p *wa/ &&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)'"'"' /etc/audit/rules.d/*.rules' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-w /etc/sudoers -p wa -k scope' || { echo step1: missing '-w /etc/sudoers -p wa -k scope'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-w /etc/sudoers.d -p wa -k scope' || { echo step1: missing '-w /etc/sudoers.d -p wa -k scope'; return 1; }; o=$(bash -c 'auditctl -l | awk '"'"'/^ *-w/ &&/\/etc\/sudoers/ &&/ +-p *wa/ &&(/ key= *[!-~]* *$/||/ -k *[!-~]* *$/)'"'"'' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-w /etc/sudoers -p wa -k scope' || { echo step2: missing '-w /etc/sudoers -p wa -k scope'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- '-w /etc/sudoers.d -p wa -k scope' || { echo step2: missing '-w /etc/sudoers.d -p wa -k scope'; return 1; }; }; if alt0; then echo compliant; fi

예상 출력: compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor scope changes for system administrators. Example: # printf " -w /etc/sudoers -p wa -k scope -w /etc/sudoers.d -p wa -k scope " >> /etc/audit/rules.d/50-scope.rules Merge and load the rules into active configuration: # augenrules --load Check if reboot is required. # if [[ $(auditctl -s | grep "enabled") =~ "2" ]]; then printf "Reboot required to load rules\n"; fi

속성

운영 체제: ubuntu-20.04
태그: cis-convertedlinux
참고 자료: CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 - 6.3.3.1

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