Ensure events that modify the system's Mandatory Access Controls are collected

NiedrigStufe 2Automatisiertlinux

Beschreibung

Monitor AppArmor, an implementation of mandatory access controls. The parameters below monitor any write access (potential additional, deletion or modification of files in the directory) or attribute changes to the /etc/apparmor/ and /etc/apparmor.d/ directories. Note: If a different Mandatory Access Control method is used, changes to the corresponding directories should be audited.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

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

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Edit or create a file in the /etc/audit/rules.d/ directory, ending in .rules extension, with the relevant rules to monitor events that modify the system's Mandatory Access Controls. Example: # printf " -w /etc/apparmor/ -p wa -k MAC-policy -w /etc/apparmor.d/ -p wa -k MAC-policy " >> /etc/audit/rules.d/50-MAC-policy.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

Eigenschaften

Betriebssysteme: ubuntu-20.04
Tags: cis-convertedlinux
Referenz: CIS Ubuntu Linux 20.04 LTS Benchmark v3.0.0 - 6.3.3.14

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