TMAegis
Más reglas para linux

TMA-ROCKY8-6.2.3.1

Ensure access to all logfiles has been configured

MediaNivel 1Automatizadalinux

Descripción

Log files contain information from many services on the the local system, or in the event of a centralized log server, others systems logs as well. In general log files are found in /var/log/, although application can be configured to store logs elsewhere. Should your application store logs in another, ensure to run the same test on that location.

Cómo se verifica

Método de auditoría: Comando de shell

shell
alt0() { o=$(bash -c '#!/usr/bin/env bash

{
   a_output=(); a_output2=()
   f_file_test_chk()
   {
      a_out2=()
      maxperm="$( printf '"'"'%o'"'"' $(( 0777 & ~$perm_mask)) )"
      [ $(( $l_mode & $perm_mask )) -gt 0 ] && \
         a_out2+=("   o Mode: \"$l_mode\" should be \"$maxperm\" or more restrictive")
      [[ ! "$l_user" =~ $l_auser ]] && \
         a_out2+=("   o Owned by: \"$l_user\" and should be owned by \"${l_auser//|/ or }\"")
      [[ ! "$l_group" =~ $l_agroup ]] && \
         a_out2+=("   o Group owned by: \"$l_group\" and should be group owned by \"${l_agroup//|/ or }\"")
      [ "${#a_out2[@]}" -gt 0 ] && a_output2+=(" - File: \"$l_fname\" is:" "${a_out2[@]}")
   }
   while IFS= read -r -d $'"'"'\0'"'"' l_file; do
      while IFS=: read -r l_fname l_mode l_user l_group; do
         if grep -Pq -- '"'"'\/(apt)\h*$'"'"' <<< "$(dirname "$l_fname")"; then
            perm_mask='"'"'0133'"'"' l_auser="root" l_agroup="(root|adm)"; f_file_test_chk
         else
            case "$(basename "$l_fname")" in
               lastlog | lastlog.* | wtmp | wtmp.* | wtmp-* | btmp | btmp.* | btmp-* | README)
                  perm_mask='"'"'0113'"'"' l_auser="root" l_agroup="(root|utmp)"
                  f_file_test_chk ;;
               cloud-init.log* | localmessages* | waagent.log*)
                  perm_mask='"'"'0133'"'"' l_auser="(root|syslog)" l_agroup="(root|adm)"
                  file_test_chk ;;
               secure{,*.*,.*,-*} | auth.log | syslog | messages)
                  perm_mask='"'"'0137'"'"' l_auser="(root|syslog)" l_agroup="(root|adm)"
                  f_file_test_chk ;;
               SSSD | sssd)
                  perm_mask='"'"'0117'"'"' l_auser="(root|SSSD)" l_agroup="(root|SSSD)"
                  f_file_test_chk ;;
               gdm | gdm3)
                  perm_mask='"'"'0117'"'"' l_auser="root" l_agroup="(root|gdm|gdm3)"
                  f_file_test_chk ;;
               *.journal | *.journal~)
                  perm_mask='"'"'0137'"'"' l_auser="root" l_agroup="(root|systemd-journal)"
                  f_file_test_chk ;;
               *)
                  perm_mask='"'"'0137'"'"' l_auser="(root|syslog)" l_agroup="(root|adm)"
                  if [ "$l_user" = "root" ] || ! grep -Pq -- "^\h*$(awk -F: '"'"'$1=="'"'"'"$l_user"'"'"'" {print $7}'"'"' /etc/passwd)\b" /etc/shells; then
                     ! grep -Pq -- "$l_auser" <<< "$l_user" && l_auser="(root|syslog|$l_user)"
                     ! grep -Pq -- "$l_agroup" <<< "$l_group" && l_agroup="(root|adm|$l_group)"
                  fi
                  f_file_test_chk ;;
            esac
         fi
      done < <(stat -Lc '"'"'%n:%#a:%U:%G'"'"' "$l_file")
   done < <(find -L /var/log -type f \( -perm /0137 -o ! -user root -o ! -group root \) -print0)
   if [ "${#a_output2[@]}" -le 0 ]; then
      a_output+=("  - All files in \"/var/log/\" have appropriate permissions and ownership")
      printf '"'"'\n%s'"'"' "- Audit Result:" "  ** PASS **" "${a_output[@]}" ""
   else
      printf '"'"'\n%s'"'"' "- Audit Result:" "  ** FAIL **" " - Reason(s) for audit failure:" "${a_output2[@]}" ""
   fi
}' 2>&1); printf '%s\n' "$o" | grep -q '\*\* PASS \*\*' || { echo "step1: script did not report PASS"; return 1; }; }; if alt0; then echo compliant; fi
Salida esperada
compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Run the following script to update permissions and ownership on files in /var/log. Although the script is not destructive, ensure that the output is captured in the event that the remediation causes issues. #!/usr/bin/env bash { a_output2=() f_file_test_fix() { a_out2=() maxperm="$( printf '%o' $(( 0777 & ~$perm_mask)) )" if [ $(( $l_mode & $perm_mask )) -gt 0 ]; then a_out2+=(" o Mode: \"$l_mode\" should be \"$maxperm\" or more restrictive" " x Removing excess permissions") chmod "$l_rperms" "$l_fname" fi if [[ ! "$l_user" =~ $l_auser ]]; then a_out2+=(" o Owned by: \"$l_user\" and should be owned by \"${l_auser//|/ or }\"" " x Changing ownership to: \"$l_fix_account\"") chown "$l_fix_accou…

Propiedades

Sistemas operativos
rocky-8
Etiquetas
cis-convertedlinux
Referencia
CIS Rocky Linux 8 Benchmark v3.0.0 - 6.2.3.1

Verificar este host

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

shell
tmaegis scan --target linux