debian-cis/bin/hardening/6.2.4_remove_legacy_shadow_entries.sh

#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening
#

#
# 6.2.4 Ensure no legacy "+" entries exist in /etc/shadow (Scored)
#

set -e # One error, it's over
set -u # One variable unset, it's over

# shellcheck disable=2034
HARDENING_LEVEL=1
# shellcheck disable=2034
DESCRIPTION="Verify no legacy + entries exist in /etc/shadow file."

FILE='/etc/shadow'
RESULT=''

# This function will be called if the script status is on enabled / audit mode
audit() {
    info "Checking if accounts have a legacy password entry"
    if $SUDO_CMD grep '^+:' "$FILE" -q; then
        RESULT=$($SUDO_CMD grep '^+:' "$FILE")
        crit "Some accounts have a legacy password entry"
        crit "$RESULT"
    else
        ok "All accounts have a valid password entry format"
    fi
}

# This function will be called if the script status is on enabled mode
apply() {
    if grep '^+:' "$FILE" -q; then
        RESULT=$(grep '^+:' "$FILE")
        warn "Some accounts have a legacy password entry"
        for LINE in $RESULT; do
            info "Removing $LINE from $FILE"
            delete_line_in_file "$FILE" "$LINE"
        done
    else
        ok "All accounts have a valid password entry format"
    fi
}

# This function will check config parameters required
check_config() {
    :
}

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    # shellcheck source=../../debian/default
    . /etc/default/cis-hardening
fi
if [ -z "$CIS_ROOT_DIR" ]; then
    echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
    echo "Cannot source CIS_ROOT_DIR variable, aborting."
    exit 128
fi

# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
    # shellcheck source=../../lib/main.sh
    . "$CIS_ROOT_DIR"/lib/main.sh
else
    echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
    exit 128
fi