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

BajaNivel 2Automatizadalinux

Descripción

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 /usr/share/apparmor/ directories. Note: If a different Mandatory Access Control method is used, changes to the corresponding directories should be audited.

Cómo se verifica

Método de auditoría: Comando de shell

shell

alt0() { o=$(bash -c 'awk '"'"'/^ *-w/ &&(/\/etc\/apparmor/ ||/\/usr\/share\/apparmor/) &&/ +-p *wa/ &&(/ key= *[!-~]* *$/||/ -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/ $//' | grep -Fxq -- '-w /usr/share/apparmor -p wa -k MAC-policy' || { echo step1: missing '-w /usr/share/apparmor -p wa -k MAC-policy'; return 1; }; o=$(bash -c 'auditctl -l | awk '"'"'/^ *-w/ &&(/\/etc\/apparmor/ ||/\/usr\/share\/apparmor/) &&/ +-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 /usr/share/apparmor -p wa -k MAC-policy' || { echo step2: missing '-w /usr/share/apparmor -p wa -k MAC-policy'; return 1; }; }; if alt0; then echo compliant; fi

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Note: If a different Mandatory Access Control method is used, changes to the corresponding directories should be audited. 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 /usr/share/apparmor -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

Propiedades

Sistemas operativos: sles-15
Etiquetas: cis-convertedlinux
Referencia: CIS SUSE Linux Enterprise 15 Benchmark v2.0.1 - 6.3.3.14

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target linux --level 2