lynis/include/tests_hardening

#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2013, Michael Boelen
# Copyright 2007-2017, CISOfy
#
# Website  : https://cisofy.com
# Blog     : http://linux-audit.com
# GitHub   : https://github.com/CISOfy/lynis
#
# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
# welcome to redistribute it under the terms of the GNU General Public License.
# See LICENSE file for usage of this software.
#
#################################################################################
#
    InsertSection "Hardening"

    # COMPILER_INSTALLED is initialised before
    HARDEN_COMPILERS_NEEDED=0
#
#################################################################################
#
    # Test        : HRDN-7220
    # Description : Check for installed compilers
    # Notes       : No suggestion for hardening compilers, as HRDN-7222 will take care of that
    Register --test-no HRDN-7220 --weight L --network NO --category security --description "Check if one or more compilers are installed"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Check if one or more compilers can be found on the system"
        if [ ${COMPILER_INSTALLED} -eq 0 ]; then
            LogText "Result: no compilers found"
            Display --indent 4 --text "- Installed compiler(s)" --result "${STATUS_NOT_FOUND}" --color GREEN
            AddHP 3 3
        else
            LogText "Result: found installed compiler. See top of logfile which compilers have been found or use ${GREPBINARY} to filter on 'compiler'"
            Display --indent 4 --text "- Installed compiler(s)" --result "${STATUS_FOUND}" --color RED
            AddHP 1 3
        fi
    fi
#
#################################################################################
#
    # Test        : HRDN-7222
    # Description : Check for permissions of installed compilers
    Register --test-no HRDN-7222 --weight L --network NO --category security --description "Check compiler permissions"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Check if one or more compilers can be found on the system"
        HARDEN_COMPILERS_NEEDED=0
        if [ ${COMPILER_INSTALLED} -eq 0 ]; then
            LogText "Result: no compilers found"
        else
            # as
            if [ ! -z "${ASBINARY}" ]; then
                LogText "Test: Check file permissions for as (Assembler)"
                if IsWorldExecutable ${ASBINARY}; then
                    LogText "Binary: found ${ASBINARY} (world executable)"
                    Report "compiler_world_executable[]=${ASBINARY}"
                    AddHP 2 3
                    HARDEN_COMPILERS_NEEDED=1
                else
                    AddHP 3 3
                fi
            fi
            # gcc
            if [ ! -z "${GCCBINARY}" ]; then
                LogText "Test: Check file permissions for GCC compiler"
                if IsWorldExecutable ${GCCBINARY}; then
                    LogText "Binary: found ${GCCBINARY} (world executable)"
                    Report "compiler_world_executable[]=${GCCBINARY}"
                    AddHP 2 3
                    HARDEN_COMPILERS_NEEDED=1
                else
                    AddHP 3 3
                fi
            fi
            # Report suggestion is one or more compilers can be better hardened
            if [ ${HARDEN_COMPILERS_NEEDED} -eq 1 ]; then
                LogText "Result: at least one compiler could be better hardened by restricting executable access to root or group only"
                ReportSuggestion ${TEST_NO} "Harden compilers like restricting access to root user only"
            fi

            # TODO check if compilers have a specific group (like compiler, or NOT root/wheel)
            # Display --indent 4 --text "- Installed compiler(s)" --result "${STATUS_FOUND}" --color RED
            # /usr/bin/*cc*
            # /usr/bin/*++*
            # /usr/bin/ld
            # (and 700 or 750 permissions)
        fi
    fi
#
#################################################################################
#
    # Test        : HRDN-7230
    # Description : Check for installed malware scanners
    Register --test-no HRDN-7230 --weight L --network NO --category security --description "Check for malware scanner"
    if [ ${SKIPTEST} -eq 0 ]; then
        LogText "Test: Check if a malware scanner is installed"
        if [ ${MALWARE_SCANNER_INSTALLED} -eq 1 ]; then
            LogText "Result: found at least one malware scanner"
            Display --indent 4 --text "- Installed malware scanner" --result "${STATUS_FOUND}" --color GREEN
            AddHP 3 3
        else
            LogText "Result: no malware scanner found"
            if [ "${MACHINE_ROLE}" = "personal" ]; then
                Display --indent 4 --text "- Installed malware scanner" --result "${STATUS_NOT_FOUND}" --color YELLOW
            else
                Display --indent 4 --text "- Installed malware scanner" --result "${STATUS_NOT_FOUND}" --color RED
            fi
            ReportSuggestion ${TEST_NO} "Harden the system by installing at least one malware scanner, to perform periodic file system scans" "-" "Install a tool like rkhunter, chkrootkit, OSSEC"
            AddHP 1 3
            LogText "Result: no malware scanner found"
        fi
    fi
#
#################################################################################
#
#    LogText "--------------------------------------------------------------------"
#    LogText "| System part                        | Preferred value | Actual value | Points |"
#    LogText "| [!] Compiler installed               |              0  | [${COMPILER_INSTALLED}]     | x  |"
#    LogText "| [V] Malware scanner installed        |              1  | [x]     | x  |"
#    LogText "| [V] Packet filter enabled            |              1  | [x]     | x  |"
#    LogText "--------------------------------------------------------------------"
#    LogText "| [!]: Hardening possible,  [V]: Hardening performed,  [ ]: Unknown "
#    LogText "--------------------------------------------------------------------"
#
#################################################################################
#

Report "compiler_installed=${COMPILER_INSTALLED}"
WaitForKeyPress

#
#================================================================================
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com