#!/bin/sh

#################################################################################
#
#   Lynis
# ------------------
#
# Copyright 2007-2015, Michael Boelen, CISOfy (michael.boelen@cisofy.com)
# Web site: https://cisofy.com
#
# This software is licensed under GPL, version 3. See LICENSE file for
# usage of this software.
#
#################################################################################
#
# Operating System detection
#
#################################################################################
#

    # Check operating system
    case `uname` in

        # IBM AIX
        AIX)
          OS="AIX"
          OS_NAME="AIX"
          OS_VERSION=`oslevel`
          OS_FULLNAME="AIX ${OS_VERSION}"
          CPU=`uname -p`
          HARDWARE=`uname -M`
          FIND_BINARIES="whereis -b"
          SYSCTL_READKEY=""
        ;;

        # Mac OS X
        Darwin)
          OS="MacOS"
          if [ -x /usr/bin/sw_vers ]; then
              OS_NAME=`/usr/bin/sw_vers -productName`
              OS_VERSION=`/usr/bin/sw_vers -productVersion`
              OS_FULLNAME="${OS_NAME} ${OS_VERSION}"
            else
              # Fall back to pretty safe name
              OS_NAME="Mac OS X"
              OS_FULLNAME=`uname -s -r`
              OS_VERSION=`uname -r`
          fi
          HARDWARE=`uname -m`
          HOMEDIRS="/Users"
          FIND_BINARIES="whereis"
          OS_KERNELVERSION=`uname -r`
          SYSCTL_READKEY=""
        ;;

        # DragonFly BSD
        DragonFly)
          OS="DragonFly"
          OS_NAME="DragonFly BSD"
          OS_FULLNAME=`uname -s -r`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          HOMEDIRS="/home /root"
          FIND_BINARIES="whereis -q -a -b"
          OS_KERNELVERSION=`uname -i`
          SYSCTL_READKEY="sysctl -n"
        ;;

        # FreeBSD
        FreeBSD)
          OS="FreeBSD"
          OS_NAME="FreeBSD"
          OS_FULLNAME=`uname -s -r`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          HOMEDIRS="/home /root"
          FIND_BINARIES="whereis -q -a -b"
          OS_KERNELVERSION=`uname -i`
          SYSCTL_READKEY="sysctl -n"

          # TrueOS
          if [ -f /etc/defaults/trueos ]; then
              OS_NAME="TrueOS"
              logtext "Result: found TrueOS file, system is completely based on FreeBSD though. Only adjusting OS name."
          fi
        ;;

        # HP-UX
        HP-UX)
          OS="HP-UX"
          OS_NAME="HP-UX"
          OS_FULLNAME=`uname -s -r`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          FIND_BINARIES="whereis -b"
          SYSCTL_READKEY=""
        ;;

        # Linux
        Linux)
          OS="Linux"
          OS_NAME="Linux"
          OS_FULLNAME=""
          OS_VERSION=`uname -r`
          LINUX_VERSION=""
          HARDWARE=`uname -m`
          HOMEDIRS="/home"
          FIND_BINARIES="whereis -b"
          OS_KERNELVERSION_FULL=`uname -r`
          OS_KERNELVERSION=`echo ${OS_KERNELVERSION_FULL} | sed 's/-.*//'`

          # Amazon
          if [ -e "/etc/system-release" ]; then
              FIND=`grep "Amazon" /etc/system-release`
              if [ ! "${FIND}" = "" ]; then
                  OS_REDHAT_OR_CLONE=1
                  OS_FULLNAME=`cat /etc/system-release | grep "^Amazon"`
                  OS_VERSION=`grep "^Amazon" /etc/system-release | awk '{ if ($4=="release") { print $5 } }'`
                  LINUX_VERSION="Amazon"
              fi
          fi

          # Arch Linux
          if [ -e "/etc/arch-release" ]; then
            OS_FULLNAME="Arch Linux"
            OS_VERSION="Unknown"
            LINUX_VERSION="Arch Linux"
          fi

          # Chakra Linux
          if [ -e "/etc/chakra-release" ]; then
            OS_FULLNAME=`cat /etc/chakra-release | grep "^Chakra"`
            OS_VERSION=`cat /etc/chakra-release | grep "^Chakra" | awk '{ if ($3=="release") { print $4 }}'`
            LINUX_VERSION="Chakra Linux"
          fi

          # Cobalt
          if [ -e "/etc/cobalt-release" ]; then OS_FULLNAME=`cat /etc/cobalt-release`; fi
          # CPUBuilders Linux
          if [ -e "/etc/cpub-release" ]; then OS_FULLNAME=`cat /etc/cpub-release`; fi

          # Debian/Ubuntu (***) - Set first to Debian
          if [ -e "/etc/debian_version" ]; then
              OS_VERSION=`cat /etc/debian_version`
              OS_FULLNAME="Debian ${OS_VERSION}"
              LINUX_VERSION="Debian"
          fi
          # /etc/lsb-release does not exist on Debian
          if [ -e "/etc/debian_version" -a -e /etc/lsb-release ]; then
                OS_VERSION=`cat /etc/debian_version`
                FIND=`grep "^DISTRIB_ID=" /etc/lsb-release | cut -d '=' -f2 | sed 's/"//g'`
                if [ "${FIND}" = "Ubuntu" ]; then
                    OS_VERSION=`grep "^DISTRIB_RELEASE=" /etc/lsb-release | cut -d '=' -f2`
                    OS_FULLNAME="Ubuntu ${OS_VERSION}"
                    LINUX_VERSION="Ubuntu"
                  elif [ "${FIND}" = "elementary OS" ]; then
                    LINUX_VERSION="elementary OS"
                    OS_VERSION=`grep "^DISTRIB_RELEASE=" /etc/lsb-release | cut -d '=' -f2`
                    OS_FULLNAME=`grep "^DISTRIB_DESCRIPTION=" /etc/lsb-release | cut -d '=' -f2 | sed 's/"//g'`
                  else
                    # Catch all, in case it's unclear what specific release this is.
                    OS_FULLNAME="Debian ${OS_VERSION}"
                    LINUX_VERSION="Debian"
                fi
                # Ubuntu test (optional) `cat /proc/version | grep "[Uu]buntu"`
          fi
          # E-smith
          if [ -e "/etc/e-smith-release" ]; then OS_FULLNAME=`cat /etc/e-smith-release`; fi
          # Gentoo
          if [ -e "/etc/gentoo-release" ]; then OS_FULLNAME=`cat /etc/gentoo-release`; fi

          # Red Hat and others
          if [ -e "/etc/redhat-release" ]; then
                OS_REDHAT_OR_CLONE=1

                # CentOS
                FIND=`grep "CentOS" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "CentOS"`
                    LINUX_VERSION="CentOS"
                    OS_VERSION="${OS_FULLNAME}"
                fi

                # ClearOS
                FIND=`grep "ClearOS" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "ClearOS"`
                    LINUX_VERSION="ClearOS"
                    OS_VERSION="${OS_FULLNAME}"
                fi

                # Fedora
                FIND=`grep "Fedora" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "Fedora"`
                    OS_VERSION="${OS_FULLNAME}"
                    LINUX_VERSION="Fedora"
                fi

                # Mageia (has also /etc/megaia-release)
                FIND=`grep "Mageia" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "^Mageia"`
                    OS_VERSION=`grep "^Mageia" /etc/redhat-release | awk '{ if ($2=="release") { print $3 } }'`
                    LINUX_VERSION="Mageia"
                fi

                # Oracle Enterprise Linux
                FIND=`grep "Enterprise Linux Enterprise Linux Server" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    LINUX_VERSION="Oracle Enterprise Linux";
                    OS_FULLNAME=`cat /etc/redhat-release | grep "Enterprise Linux"`;
                    OS_VERSION="${OS_FULLNAME}";
                fi

                # Oracle Enterprise Linux
                if [ -e /etc/oracle-release ]; then
                    FIND=`grep "Oracle Linux Server" /etc/oracle-release`
                    if [ ! "${FIND}" = "" ]; then
                        LINUX_VERSION="Oracle Enterprise Linux";
                        OS_FULLNAME=`cat /etc/oracle-release | grep "Oracle Linux"`;
                        OS_VERSION="${OS_FULLNAME}";
                    fi
                fi

                # Oracle VM Server
                if [ -e /etc/ovs-release ]; then
                    FIND=`grep "Oracle VM" /etc/ovs-release`
                    if [ ! "${FIND}" = "" ]; then
                        LINUX_VERSION="Oracle VM Server";
                        OS_FULLNAME=`cat /etc/ovs-release | grep "Oracle VM"`;
                        OS_VERSION="${OS_FULLNAME}";
                    fi
                fi

                # Red Hat
                FIND=`grep "Red Hat" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "Red Hat"`
                    OS_VERSION="${OS_FULLNAME}"
                    LINUX_VERSION="Red Hat"
                fi

                # Scientific
                FIND=`grep "Scientific" /etc/redhat-release`
                if [ ! "${FIND}" = "" ]; then
                    OS_FULLNAME=`cat /etc/redhat-release | grep "^Scientific"`
                    OS_VERSION=`grep "^Scientific" /etc/redhat-release | awk '{ if ($3=="release") { print $4 } }'`
                    LINUX_VERSION="Scientific"
                fi


          fi

          # PCLinuxOS
          if [ -f /etc/pclinuxos-release ]; then
            FIND=`grep "^PCLinuxOS" /etc/pclinuxos-release`
              if [ ! "${FIND}" = "" ]; then
                OS_FULLNAME="PCLinuxOS Linux"
                LINUX_VERSION="PCLinuxOS"
                OS_VERSION=`grep "^PCLinuxOS" /etc/pclinuxos-release | awk '{ if ($2=="release") { print $3 } }'`
              fi
          fi

          # Sabayon Linux
          if [ -f /etc/sabayon-edition ]; then
            FIND=`grep "Sabayon Linux" /etc/sabayon-edition`
              if [ ! "${FIND}" = "" ]; then
                OS_FULLNAME="Sabayon Linux"
                LINUX_VERSION="Sabayon"
                OS_VERSION=`cat /etc/sabayon-edition | awk '{ print $3 }'`
              fi
          fi

          if [ -f /etc/SLOX-release ]; then
            OS_FULLNAME=`cat /etc/SLOX-release | grep "SuSE Linux"`
            LINUX_VERSION="SuSE"
          fi

          # Slackware
          if [ -f /etc/slackware-version ]; then
              LINUX_VERSION="Slackware"
              OS_VERSION=`grep "^Slackware" /etc/slackware-version | awk '{ if ($1=="Slackware") { print $2 } }'`
              OS_FULLNAME="Slackware Linux ${OS_VERSION}"
          fi

          # SuSE
          if [ -e "/etc/SuSE-release" ]; then
              OS_VERSION=`cat /etc/SuSE-release | head -n 1`;
              LINUX_VERSION="SuSE";
          fi

          # Turbo Linux
          if [ -e "/etc/turbolinux-release" ]; then	OS_FULLNAME=`cat /etc/turbolinux-release`; fi
          # YellowDog
          if [ -e "/etc/yellowdog-release" ]; then	OS_FULLNAME=`cat /etc/yellowdog-release`; fi

          # ===================================================================
          # Set OS name to the discovered Linux version
          if [ ! "${LINUX_VERSION}" = "" -a "${OS_NAME}" = "Linux" ]; then
              OS_NAME="${LINUX_VERSION}"
          fi
          # If Linux version (full name) is unknown, use uname value
          if [ "${OS_FULLNAME}" = "" ]; then OS_FULLNAME=`uname -s -r`; fi
          SYSCTL_READKEY="sysctl -n"

        ;;

        # NetBSD
        NetBSD)
          OS="NetBSD"
          OS_NAME="NetBSD"
          OS_FULLNAME=`uname -s -r`
          OS_KERNELVERSION=`uname -v`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          FIND_BINARIES="whereis"
          SYSCTL_READKEY=""
        ;;

        # OpenBSD
        OpenBSD)
          OS="OpenBSD"
          OS_NAME="OpenBSD"
          OS_FULLNAME=`uname -s -r`
          OS_KERNELVERSION=`uname -v`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          FIND_BINARIES="whereis"
          SYSCTL_READKEY=""
        ;;

        # Solaris / OpenSolaris
        SunOS)
          OS="Solaris"
          OS_NAME="Sun Solaris"
          OS_FULLNAME=`uname -s -r`
          OS_VERSION=`uname -r`
          HARDWARE=`uname -m`
          if [ -x /usr/bin/isainfo ]; then
              # Returns 32, 64
              OS_MODE=`/usr/bin/isainfo -b`
          fi
          SYSCTL_READKEY=""
        ;;

        # Unknown or unsupported systems
        *)
          echo "[ ${WARNING}WARNING${NORMAL} ]"
          echo "${WARNING}Error${NORMAL}: ${WHITE}Unknown OS found. No support available for this OS or platform...${NORMAL}"
          echo "Please consult the README/documentation for more information."
          exit 1
        ;;

    esac

    # Set correct echo binary and parameters after detecting operating system
    ECHONB=""

    case ${OS} in
           "AIX")                           ECHOCMD="echo" ;;
           "DragonFly"|"FreeBSD"|"NetBSD")  ECHOCMD="echo -e"; ECHONB="echo -n" ;;
           "MacOS")                         ECHOCMD="echo"; ECHONB="echo -n" ;;
           "Solaris")                       ECHOCMD="echo" ;;
           "Linux")
              # Check if dash is used (Debian/Ubuntu)
              DEFAULT_SHELL=`ls -l /bin/sh | awk -F'>' '{print $2}'`
              case ${DEFAULT_SHELL} in
                " dash")                    ECHOCMD="/bin/echo -e" ;;
                *)                          ECHOCMD="echo -e" ;;
              esac
            ;;
           *)                               ECHOCMD="echo -e" ;;
    esac


#================================================================================
# Lynis - Copyright 2007-2015 Michael Boelen, CISOfy - https://cisofy.com