TMA-ROCKY8-6.2.3.1
Ensure access to all logfiles has been configured
Description
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.
How it is checked
Audit method: Shell command
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- Expected output
compliant
How it is fixed
Fix method: Guidance or infrastructure patch
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…
Properties
- Operating systems
- rocky-8
- Tags
- cis-convertedlinux
- Reference
- CIS Rocky Linux 8 Benchmark v3.0.0 - 6.2.3.1
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target linux