lynis/include/tests_php

#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2014, Michael Boelen (michael@rootkit.nl), The Netherlands
# Web site: http://www.rootkit.nl
#
# 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.
#
#################################################################################
#
# Software: PHP
#
#################################################################################
#
    InsertSection "PHP"

    # Possible locations of php.ini
    PHPINILOCS="/etc/php.ini \
                /etc/php/cgi-php5/php.ini /etc/php/cli-php5/php.ini /etc/php/apache2-php5/php.ini \
                /etc/php/apache2-php5.4/php.ini /etc/php/apache2-php5.5/php.ini \
                /etc/php5/cgi/php.ini \
                /etc/php5/cli/php.ini \
                /etc/php5/cli-php5.4/php.ini /etc/php5/cli-php5.5/php.ini /etc/php5/cli-php5.6/php.ini \
                /etc/php5/apache2/php.ini \
                /private/etc/php.ini \
                /var/www/conf/php.ini \
                /usr/local/etc/php.ini /usr/local/lib/php.ini \
                /usr/pkg/etc/php.ini"

    PHPINIDIRS="/etc/php5/conf.d"
#
#################################################################################
#
    # Test        : PHP-2211
    # Description : Check php.ini presence
    Register --test-no PHP-2211 --weight L --network NO --description "Check php.ini presence"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking for presence php.ini"
        PHPINIFILE=""
        PHPINI_ALLFILES=""
        for I in ${PHPINILOCS}; do
            logtext "Test: checking presence ${I}"
            if [ -f ${I} ]; then
                PHPINIFILE=${I}
                logtext "Result: Found php.ini file (${PHPINIFILE})"
                logtext "Note: Adding file to php.ini array"
                PHPINI_ALLFILES="${PHPINI_ALLFILES} ${PHPINIFILE}"
              else
                logtext "Result: file ${I} not found"
            fi
        done

        # Check all known locations
        for I in ${PHPINIDIRS}; do
            tFILES=`ls ${I}/*.ini 2>/dev/null`
            if [ "${tFILES}" = "" ]; then
                logtext "Result: no files found for ${I}"
              else
                logtext "Result: found files in location ${I}, checking"
                for I in ${tFILES}; do
                  if [ -f ${I} ]; then
                    logtext "Result: file ${I} exists, adding to php.ini array"
                    PHPINI_ALLFILES="${PHPINI_ALLFILES} ${I}"
                  fi
                done
            fi
        done

        if [ ! "${PHPINIFILE}" = "" ]; then
            Display --indent 2 --text "- Checking PHP" --result "FOUND" --color GREEN
            logtext "Result: using single file ${PHPINIFILE} for main php.ini tests"
            logtext "Result: using php.ini array ${PHPINI_ALLFILES} for further tests"
          else
            Display --indent 2 --text "- Checking PHP" --result "NOT FOUND" --color WHITE
            logtext "Result: no php.ini file found"
        fi
    fi
#
#################################################################################
#
    # Test        : PHP-2320
    # Description : Check php disable functions option
    if [ ! "${PHPINI_ALLFILES}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no PHP-2320 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP disabled functions"
    if [ ${SKIPTEST} -eq 0 ]; then
        FOUND=0
        for I in ${PHPINI_ALLFILES}; do
            logtext "Test: Checking for PHP function hardening disabled_functions or suhosin.executor.func.blacklist in file ${I}"
            FIND=`grep "^disable_functions.*=" ${I}`
            if [ "${FIND}" = "" ]; then
              logtext "Result: ${I}: disabled_functions not found"
            else
              logtext "Result: ${I}: found disabled_functions"
              FOUND=1
            fi

            FIND=`grep "^suhosin.executor.func.blacklist=" ${I}`
            if [ "${FIND}" = "" ]; then
              logtext "Result: ${I}: suhosin.executor.func.blacklist not found"
            else
              logtext "Result: ${I}: found suhosin.executor.func.blacklist"
              FOUND=1
            fi
        done
        if [ ${FOUND} -eq 0 ]; then
            logtext "Result: all PHP functions can be executed"
            Display --indent 4 --text "- Checking PHP disabled functions" --result "NONE" --color YELLOW
            ReportSuggestion ${TEST_NO} "Harden PHP by disabling risky functions"
            logtext "Functions of interest to research/disable: chown, diskfreespace, disk_free_space, disk_total_space, dl, exec, escapeshellarg, escapeshellcmd, fileinode, highlight_file, max_execution_time, passthru, pclose, phpinfo, popen, proc_close, proc_open, proc_get_status, proc_nice, proc_open, proc_terminate, set_time_limit, shell_exec, show_source, system)"
            AddHP 0 1
          else
            logtext "Result: one or more PHP functions are disabled/blacklisted"
            Display --indent 4 --text "- Checking PHP disabled functions" --result "FOUND" --color GREEN
            AddHP 3 3
        fi
    fi
#
#################################################################################
#
    # Test        : PHP-2368
    # Description : Check php register_globals option
    # Notes       : Don't test for it if PHP version is 5.4.0 or later (it has been removed)
    if [ ! "${PHPINIFILE}" = "" -a ! "${PHPVERSION}" = "" ]; then
       FIND=`echo ${PHPVERSION} | ${EGREPBINARY} "^(4.|5.[0-3])"`
       if [ "${FIND}" = "" ]; then
           PREQS_MET="NO"; Debug "Found most likely PHP version 5.4.0 or higher (${PHPVERSION}) which does not use register_globals"
         else
           PREQS_MET="YES"; Debug "Found PHP version 4 or up to 5.3 (${FIND}) which we are going to scan"
        fi
     else
       Debug "Skipping test: php.ini not found, or PHP version empty"
       Debug "php.ini: ${PHPINIFILE}"
       Debug "version: ${PHPVERSION}"
    fi
    Register --test-no PHP-2368 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP register_globals option"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking PHP register_globals option"
        FIND=`cat ${PHPINIFILE} | egrep -i 'register_globals.*(on|yes|1)' | grep -v '^;'`
        if [ ! "${FIND}" = "" ]; then
            Display --indent 4 --text "- Checking register_globals option" --result WARNING --color RED
            ReportWarning ${TEST_NO} "M" "PHP option register_globals option is turned on, which can be a risk for variable value overwriting"
            ReportSuggestion ${TEST_NO} "Change the register_globals line to: register_globals = Off"
            logtext "Result: register_globals option is turned on, which can be a risk for variable value overwriting."
            AddHP 1 2
          else
            Display --indent 4 --text "- Checking register_globals option" --result OK --color GREEN
            logtext "Result: No 'register_globals' found. Most likely it is in disabled state (0, no, or off), which is the default nowadays and considered the safe value."
            ReportManual ${TEST_NO}:01
            AddHP 2 2
        fi
    fi
#
#################################################################################
#
    # Test        : PHP-2372
    # Description : Check php expose_php option
    # Notes       : Extend test to check all PHP files YYY
    if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no PHP-2372 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP expose_php option"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking expose_php option"
        FIND=`cat ${PHPINIFILE} | egrep -i 'expose_php.*(off|no|0)' | grep -v '^;'`
        if [ "${FIND}" = "" ]; then
            Display --indent 4 --text "- Checking expose_php option" --result ON --color RED
            ReportWarning ${TEST_NO} "M" "PHP option expose_php is possibly turned on, which can reveal useful information for attackers."
            ReportSuggestion ${TEST_NO} "Change the expose_php line to: expose_php = Off"
            report "Result: expose_php option is turned on, which can expose useful information for an attacker"
            AddHP 1 2
          else
            Display --indent 4 --text "- Checking expose_php option" --result OFF --color GREEN
            logtext "Result: Found 'expose_php' in disabled state (0, no, or off)"
            AddHP 2 2
        fi
        #YYY Check through all files
    fi
#
#################################################################################
#
    # Test        : PHP-2374
    # Description : Check PHP enable_dl option
    # Notes       : Extend test to check all PHP files YYY
    if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no PHP-2374 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP enable_dl option"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking PHP enable_dl option"
        FIND=`cat ${PHPINIFILE} | egrep -i 'enable_dl.*(off|no|0)' | grep -v '^;'`
        if [ "${FIND}" = "" ]; then
            Display --indent 4 --text "- Checking enable_dl option" --result ON --color YELLOW
            report "Result: enable_dl option is turned on, which can be used for riskful downloads via PHP"
            ReportSuggestion ${TEST_NO} "Change the enable_dl line to: enable_dl = Off, to disable downloads via PHP"
            AddHP 0 1
          else
            Display --indent 4 --text "- Checking enable_dl option" --result OFF --color GREEN
            logtext "Result: Found 'enable_dl' in disabled state (0, no, or off)"
            AddHP 2 2
        fi
        #YYY Check through all files
    fi
#
#################################################################################
#
    # Test        : PHP-2376
    # Description : Check PHP allow_url_fopen option
    # Notes       : Extend test to check all PHP files YYY
    if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no PHP-2376 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP allow_url_fopen option"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking PHP allow_url_fopen option"
        FIND=`cat ${PHPINIFILE} | egrep -i 'allow_url_fopen.*(off|no|0)' | grep -v '^;'`
        if [ "${FIND}" = "" ]; then
            Display --indent 4 --text "- Checking allow_url_fopen option" --result ON --color YELLOW
            report "Result: allow_url_fopen option is turned on, which can be used for riskful downloads via PHP"
            ReportSuggestion ${TEST_NO} "Change the allow_url_fopen line to: allow_url_fopen = Off, to disable downloads via PHP"
            AddHP 0 1
          else
            Display --indent 4 --text "- Checking allow_url_fopen option" --result OFF --color GREEN
            logtext "Result: Found 'allow_url_fopen' in disabled state (0, no, or off)"
            AddHP 2 2
        fi
        #YYY Check through all files
    fi
#
#################################################################################
#
    # Test        : PHP-2378
    # Description : Check PHP allow_url_include option
    # Notes       : Extend test to check all PHP files YYY
    if [ ! "${PHPINIFILE}" = "" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
    Register --test-no PHP-2378 --preqs-met ${PREQS_MET} --weight L --network NO --description "Check PHP allow_url_include option"
    if [ ${SKIPTEST} -eq 0 ]; then
        logtext "Test: Checking PHP allow_url_include option"
        FIND=`cat ${PHPINIFILE} | egrep -i 'allow_url_include.*(off|no|0)' | grep -v '^;'`
        if [ "${FIND}" = "" ]; then
            Display --indent 4 --text "- Checking allow_url_include option" --result ON --color YELLOW
            report "Result: allow_url_include option is turned on, which can be used for riskful downloads via PHP"
            ReportSuggestion ${TEST_NO} "Change the allow_url_include line to: allow_url_include = Off, to disable downloads via PHP"
            AddHP 0 1
          else
            Display --indent 4 --text "- Checking allow_url_include option" --result OFF --color GREEN
            logtext "Result: Found 'allow_url_include' in disabled state (0, no, or off)"
            AddHP 2 2
        fi
        #YYY Check through all files
    fi
#
#################################################################################
#
# Disable/use functions:
# safe_mode (only for PHP5?)
# open_basedir (limits access to defined directory, comparable with chrooting)
# disable_classes
# session.save_path
# session.referer_check
# upload_tmp_dir
# file_uploads Off, if possible
# Set display_errors to Off
# Set log_errors to On and define error_log (with value Syslog or a filename)
#
#################################################################################
#
    # mod_suexec
    # suPHP (/etc/suphp.conf)
#
#################################################################################
#
    # Test        : PHP-2388
    # Description : Check php version number
#
#################################################################################
#

wait_for_keypress

#
#================================================================================
# Lynis - Copyright 2007-2014, Michael Boelen - www.rootkit.nl - The Netherlands