#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening
#

#
# 1.7.2.2 Ensure AppArmor is enabled in the bootloader configuration (Scored)
#

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

# shellcheck disable=2034
HARDENING_LEVEL=3
# shellcheck disable=2034
DESCRIPTION="Activate AppArmor to enforce permissions control."

PACKAGES='apparmor apparmor-utils'

# This function will be called if the script status is on enabled / audit mode
audit() {
    for PACKAGE in $PACKAGES; do
        is_pkg_installed "$PACKAGE"
        if [ "$FNRET" != 0 ]; then
            crit "$PACKAGE is absent!"
        else
            ok "$PACKAGE is installed"
        fi
    done

    ERROR=0
    RESULT=$($SUDO_CMD grep "^\s*linux" /boot/grub/grub.cfg)

    # define custom IFS and save default one
    d_IFS=$IFS
    c_IFS=$'\n'
    IFS=$c_IFS
    for line in $RESULT; do
        if [[ ! "$line" =~ "apparmor=1" ]] || [[ ! "$line" =~ "security=apparmor" ]]; then
            crit "$line is not configured"
            ERROR=1
        fi
    done
    IFS=$d_IFS
    if [ "$ERROR" = 0 ]; then
        ok "$PACKAGES are configured"

    fi
}

# This function will be called if the script status is on enabled mode
apply() {
    for PACKAGE in $PACKAGES; do
        is_pkg_installed "$PACKAGE"
        if [ "$FNRET" = 0 ]; then
            ok "$PACKAGE is installed"
        else
            crit "$PACKAGE is absent, installing it"
            apt_install "$PACKAGE"
        fi
    done

    ERROR=0
    RESULT=$($SUDO_CMD grep "^\s*linux" /boot/grub/grub.cfg)

    # define custom IFS and save default one
    d_IFS=$IFS
    c_IFS=$'\n'
    IFS=$c_IFS
    for line in $RESULT; do
        if [[ ! $line =~ "apparmor=1" ]] || [[ ! $line =~ "security=apparmor" ]]; then
            crit "$line is not configured"
            ERROR=1
        fi
    done
    IFS=$d_IFS

    if [ $ERROR = 1 ]; then
        $SUDO_CMD sed -i "s/GRUB_CMDLINE_LINUX=\"/GRUB_CMDLINE_LINUX=\"apparmor=1 security=apparmor/" /etc/default/grub
        $SUDO_CMD update-grub
    else
        ok "$PACKAGES are configured"
    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