#!/bin/bash

# run-shellcheck
#
# OVH Security audit
#

#
# Checks there are no carte-blanche authorization in sudoers file(s).
#

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

# shellcheck disable=2034
DESCRIPTION="Checks there are no carte-blanche authorization in sudoers file(s)."

FILE="/etc/sudoers"
DIRECTORY="/etc/sudoers.d"
# spaces will be expanded to [:space:]* when using the regex
# improves readability in audit report
REGEX="ALL = \( ALL( : ALL)? \)( NOPASSWD:)? ALL"
EXCEPT=""

# This function will be called if the script status is on enabled / audit mode
audit () {
    FILES=""
    if $SUDO_CMD [ ! -r "$FILE" ]; then
        crit "$FILE is not readable"
        return
    fi
    FILES="$FILE"
    if $SUDO_CMD [ ! -d "$DIRECTORY" ]; then
        debug "$DIRECTORY does not exist"
    elif $SUDO_CMD [ ! -x "$DIRECTORY" ]; then
        crit "Cannot browse $DIRECTORY"
    else
        FILES="$FILES $($SUDO_CMD ls -1 $DIRECTORY | sed s=^=$DIRECTORY/= )"
    fi
    for file in $FILES; do
        if $SUDO_CMD [ ! -r "$file" ]; then
            crit "$file is not readable"
        else
            # shellcheck disable=2001
            if ! $SUDO_CMD grep -E "$(echo "$REGEX" | sed 's/ /[[:space:]]*/g')" "$file" &> /dev/null ; then
                ok  "There is no carte-blanche sudo permission in $file"
            else
                # shellcheck disable=2001
                RET=$($SUDO_CMD grep -E "$(echo "$REGEX" | sed 's/ /[[:space:]]*/g')" "$file" | sed 's/\t/#/g;s/ /#/g' )
                for line in $RET; do
                    if grep -q "$(echo "$line" | cut -d '#' -f 1)" <<< "$EXCEPT" ; then
                        # shellcheck disable=2001
                        ok "$(echo "$line" | sed 's/#/ /g') is present in $file but was EXCUSED because $(echo "$line" | cut -d '#' -f 1) is part of exceptions."
                        continue
                    fi
                    # shellcheck disable=2001
                    crit "$(echo "$line" | sed 's/#/ /g') is present in $file"
                done
            fi
        fi
    done

}

# This function will be called if the script status is on enabled mode
apply () {
    :
}

# This function will create the config file for this check with default values
create_config() {
    cat <<EOF
status=audit
# Put EXCEPTION account names here, space separated
EXCEPT="root %root %sudo %wheel"
EOF
}
# This function will check config parameters required
check_config() {
    :
}

# Source Root Dir Parameter
if [ -r /etc/default/cis-hardening ]; then
    . /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 "$CIS_ROOT_DIR"/lib/main.sh ]; then
    # shellcheck source=/opt/debian-cis/lib/main.sh
    . "$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