#!/bin/bash

#
# CIS Debian Hardening
#

#
# 4.1.1.2 Ensure system is disabled when audit logs are full (Scored)
#

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

HARDENING_LEVEL=4
DESCRIPTION="Disable system on audit log full."

FILE='/etc/audit/auditd.conf'
OPTIONS='space_left_action=email action_mail_acct=root admin_space_left_action=halt'

# This function will be called if the script status is on enabled / audit mode
audit () {
    does_file_exist $FILE
    if [ $FNRET != 0 ]; then
        crit "$FILE does not exist"
    else
        ok "$FILE exists, checking configuration"
        for AUDIT_OPTION in $OPTIONS; do
        AUDIT_PARAM=$(echo $AUDIT_OPTION | cut -d= -f 1)
        AUDIT_VALUE=$(echo $AUDIT_OPTION | cut -d= -f 2)
        PATTERN="^$AUDIT_PARAM[[:space:]]*=[[:space:]]*$AUDIT_VALUE"
        debug "$AUDIT_PARAM should be set to $AUDIT_VALUE"
        does_pattern_exist_in_file $FILE "$PATTERN"
        if [ $FNRET != 0 ]; then
            crit "$PATTERN is not present in $FILE"
        else
            ok "$PATTERN is present in $FILE"
        fi
        done
    fi
}

# This function will be called if the script status is on enabled mode
apply () {
    does_file_exist $FILE
    if [ $FNRET != 0 ]; then
        warn "$FILE does not exist, creating it"
        mkdir -p /etc/audit/auditd.conf
        touch $FILE
    else
        ok "$FILE exists"
    fi
    for AUDIT_OPTION in $OPTIONS; do
        AUDIT_PARAM=$(echo $AUDIT_OPTION | cut -d= -f 1)
        AUDIT_VALUE=$(echo $AUDIT_OPTION | cut -d= -f 2)
        debug "$AUDIT_PARAM should be set to $AUDIT_VALUE"
        PATTERN="^$AUDIT_PARAM[[:space:]]*=[[:space:]]*$AUDIT_VALUE"
        does_pattern_exist_in_file $FILE "$PATTERN"
        if [ $FNRET != 0 ]; then
            warn "$PATTERN is not present in $FILE, adding it"
            does_pattern_exist_in_file $FILE "^$AUDIT_PARAM"
            if [ $FNRET != 0 ]; then
                info "Parameter $AUDIT_PARAM seems absent from $FILE, adding at the end"
                add_end_of_file $FILE "$AUDIT_PARAM = $AUDIT_VALUE"
            else
                info "Parameter $AUDIT_PARAM is present but with the wrong value -- Fixing"
                replace_in_file $FILE "^$AUDIT_PARAM[[:space:]]*=.*" "$AUDIT_PARAM = $AUDIT_VALUE"
            fi
        else
            ok "$PATTERN is present in $FILE"
        fi
    done
}

# 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
    . $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