debian-cis/bin/hardening/6.2.6_find_0_uid_non_root_account.sh

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#!/bin/bash
# run-shellcheck
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#
# CIS Debian Hardening
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#
#
# 6.2.6 Ensure root is the only UID 0 account (Scored)
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#
set -e # One error, it's over
set -u # One variable unset, it's over
# shellcheck disable=2034
# shellcheck disable=2034
HARDENING_LEVEL=2
# shellcheck disable=2034
# shellcheck disable=2034
DESCRIPTION="Verify root is the only UID 0 account."
EXCEPTIONS=""
FILE='/etc/passwd'
RESULT=''
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# This function will be called if the script status is on enabled / audit mode
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audit() {
info "Checking if accounts have uid 0"
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RESULT=$(awk -F: '($3 == 0 && $1!="root" ) { print $1 }' "$FILE")
FOUND_EXCEPTIONS=""
for ACCOUNT in $RESULT; do
debug "Account : $ACCOUNT"
debug "Exceptions : $EXCEPTIONS"
debug "echo \"$EXCEPTIONS\" | grep -qw $ACCOUNT"
if echo "$EXCEPTIONS" | grep -qw "$ACCOUNT"; then
debug "$ACCOUNT is confirmed as an exception"
# shellcheck disable=SC2001
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RESULT=$(sed "s!$ACCOUNT!!" <<<"$RESULT")
FOUND_EXCEPTIONS="$FOUND_EXCEPTIONS $ACCOUNT"
else
debug "$ACCOUNT not found in exceptions"
fi
done
if [ -n "$RESULT" ]; then
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crit "Some accounts have uid 0: $(tr '\n' ' ' <<<"$RESULT")"
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else
ok "No account with uid 0 appart from root ${FOUND_EXCEPTIONS:+and configured exceptions:}$FOUND_EXCEPTIONS"
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fi
}
# This function will be called if the script status is on enabled mode
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apply() {
info "Removing accounts with uid 0 may seriously harm your system, report only here"
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}
# This function will create the config file for this check with default values
create_config() {
cat <<EOF
status=audit
# Put here valid accounts with uid 0 separated by spaces
EXCEPTIONS=""
EOF
}
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# This function will check config parameters required
check_config() {
if [ -z "$EXCEPTIONS" ]; then
EXCEPTIONS="@"
fi
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}
# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
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# shellcheck source=../../debian/default
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. /etc/default/cis-hardening
fi
if [ -z "$CIS_LIB_DIR" ]; then
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echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
echo "Cannot source CIS_LIB_DIR variable, aborting."
exit 128
fi
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# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
# shellcheck source=../../lib/main.sh
. "${CIS_LIB_DIR}"/main.sh
else
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
exit 128
fi