mirror of https://github.com/CISOfy/lynis.git
513 lines
25 KiB
Bash
513 lines
25 KiB
Bash
#!/bin/sh
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#################################################################################
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#
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# Lynis
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# ------------------
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#
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# Copyright 2007-2014, Michael Boelen (michael@rootkit.nl), The Netherlands
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# Web site: http://www.rootkit.nl
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#
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# Lynis comes with ABSOLUTELY NO WARRANTY. This is free software, and you are
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# welcome to redistribute it under the terms of the GNU General Public License.
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# See LICENSE file for usage of this software.
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#
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#################################################################################
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#
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# Kernel
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#
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#################################################################################
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#
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InsertSection "Kernel"
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#
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#################################################################################
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#
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CORE_DUMPS_DISABLED=0
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CPU_PAE=0
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CPU_NX=0
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#
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#################################################################################
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#
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# Test : KRNL-5622
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# Description : Check default run level on Linux machines
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Register --test-no KRNL-5622 --os Linux --weight L --network NO --description "Determine Linux default run level"
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if [ ${SKIPTEST} -eq 0 ]; then
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# Checking if we can find the systemd default target
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logtext "Test: Checking for systemd default.target"
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if [ -L /etc/systemd/system/default.target ]; then
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logtext "Result: symlink found"
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if [ ! "${READLINKBINARY}" = "" ]; then
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FIND=`${READLINKBINARY} /etc/systemd/system/default.target`
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if [ "${FIND}" = "" ]; then
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logtext "Exception: can't find the target of the symlink of /etc/systemd/system/default.target"
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ReportException "${TEST_NO}:01"
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else
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FIND2=`echo ${FIND} | egrep "runlevel5|graphical"`
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if [ ! "${FIND2}" = "" ]; then
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logtext "Result: Found match on runlevel5/graphical"
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Display --indent 2 --text "- Checking default runlevel" --result "runlevel 5" --color GREEN
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report "linux_default_runlevel=5"
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else
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logtext "Result: No match found on runlevel, defaulting to runlevel 3"
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Display --indent 2 --text "- Checking default runlevel" --result "runlevel 3" --color GREEN
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report "linux_default_runlevel=3"
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fi
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fi
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else
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logtext "Result: No readlink binary, can't determine where symlink is pointing to"
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Display --indent 2 --text "- Checking default run level" --result UNKNOWN --color YELLOW
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fi
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else
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logtext "Result: no systemd found, so trying inittab"
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logtext "Test: Checking /etc/inittab"
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if [ -f /etc/inittab ]; then
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logtext "Result: file /etc/inittab found"
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logtext "Test: Checking default Linux run level"
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FIND=`awk -F: '/^id/ { print $2; }' /etc/inittab | head -n 1`
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if [ "${FIND}" = "" ]; then
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Display --indent 2 --text "- Checking default runlevel" --result UNKNOWN --color YELLOW
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logtext "Result: Can't determine default run level from /etc/inittab"
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else
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Display --indent 2 --text "- Checking default run level" --result "${FIND}" --color GREEN
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logtext "Found default run level '${FIND}'"
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report "linux_default_runlevel=${FIND}"
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fi
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else
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logtext "Result: file /etc/inittab not found"
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if [ "${LINUX_VERSION}" = "Debian" -o "${LINUX_VERSION}" = "Ubuntu" ]; then
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logtext "Test: Checking run level with who -r, for Debian based systems"
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FIND=`who -r | awk '{ if ($1=="run-level") { print $2 } }'`
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if [ ! "${FIND}" = "" ]; then
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logtext "Result: Found default run level '${FIND}'"
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report "linux_default_runlevel=${FIND}"
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Display --indent 2 --text "- Checking default run level" --result "RUNLEVEL ${FIND}" --color GREEN
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else
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logtext "Result: Can't determine default run level from who -r"
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Display --indent 2 --text "- Checking default run level" --result UNKNOWN --color YELLOW
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fi
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fi
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fi
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5677
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# Description : Check CPU options and support (PAE, No eXecute, eXecute Disable)
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# More info : pae and nx bit are both visible on AMD and Intel CPU's if supported
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Register --test-no KRNL-5677 --os Linux --weight L --network NO --description "Check CPU options and support"
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if [ ${SKIPTEST} -eq 0 ]; then
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Display --indent 2 --text "- Checking CPU support (NX/PAE)"
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logtext "Test: Checking /proc/cpuinfo"
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if [ -f /proc/cpuinfo ]; then
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logtext "Result: found /proc/cpuinfo"
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logtext "Test: Checking CPU options (XD/NX/PAE)"
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FIND_PAE_NX=`cat /proc/cpuinfo | grep " pae " | grep " nx "`
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FIND_PAE=`cat /proc/cpuinfo | grep " pae "`
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FIND_NX=`cat /proc/cpuinfo | grep " nx "`
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FOUND=0
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if [ ! "${FIND_PAE_NX}" = "" ]; then
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logtext "PAE: Yes"
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logtext "NX: Yes"
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CPU_PAE=1
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CPU_NX=1
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logtext "Result: PAE or No eXecute option(s) both found"
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report "cpu_pae=1"
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report "cpu_nx=1"
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FOUND=1
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else
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if [ ! "${FIND_PAE}" = "" -a "${FIND_NX}" = "" ]; then
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report "cpu_pae=1"
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logtext "Result: found PAE"
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CPU_PAE=1
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FOUND=1
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else
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if [ ! "${FIND_NX}" = "" -a "${FIND_PAE}" = "" ]; then
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report "cpu_nx=1"
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logtext "Result: found No eXecute"
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CPU_NX=1
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FOUND=1
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else
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logtext "Result: found no CPU options enabled (PAE or NX bit)"
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fi
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fi
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fi
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if [ ${FOUND} -eq 1 ]; then
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Display --indent 4 --text "CPU support: PAE and/or NoeXecute supported" --result FOUND --color GREEN
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else
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Display --indent 4 --text "CPU support: No PAE or NoeXecute supported" --result NONE --color YELLOW
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ReportSuggestion ${TEST_NO} "Use a PAE enabled kernel when possible to gain native No eXecute/eXecute Disable support"
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fi
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else
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Display --indent 4 --text "CPU support: no /proc/cpuinfo" --result SKIPPED --color YELLOW
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logtext "Result: /proc/cpuinfo not found"
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5680
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# Description : Check if installed kernel has PAE support
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# Dependency : KRNL-5677
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# More info : RedHat/CentOS/Fedora uses the package name 'kernel-PAE'
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#
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#################################################################################
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#
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# Test : KRNL-5695
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# Description : Determining Linux kernel version and release number
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Register --test-no KRNL-5695 --os Linux --weight L --network NO --description "Determine Linux kernel version and release number"
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if [ ${SKIPTEST} -eq 0 ]; then
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# Kernel number (and suffix)
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LINUX_KERNEL_RELEASE=`uname -r`
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report "linux_kernel_release=${LINUX_KERNEL_RELEASE}"
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logtext "Result: found kernel release ${LINUX_KERNEL_RELEASE}"
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# Type and build date
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LINUX_KERNEL_VERSION=`uname -v`
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report "linux_kernel_version=${LINUX_KERNEL_VERSION}"
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logtext "Result: found kernel version ${LINUX_KERNEL_VERSION}"
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Display --indent 2 --text "- Checking kernel version and release" --result DONE --color GREEN
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5723
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# Description : Check if Linux is build as a monolithic kernel or not
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Register --test-no KRNL-5723 --os Linux --weight L --network NO --description "Determining if Linux kernel is monolithic"
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if [ ${SKIPTEST} -eq 0 ]; then
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if [ ! "${LSMODBINARY}" = "" ]; then
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logtext "Test: checking if kernel is monolithic or modular"
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# Checking if any modules are loaded
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FIND=`${LSMODBINARY} | grep -v "^Module" | wc -l | tr -s ' ' | tr -d ' '`
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Display --indent 2 --text "- Checking kernel type" --result DONE --color GREEN
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if [ "${FIND}" = "0" ]; then
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logtext "Result: Found monolithic kernel"
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report "linux_kernel_type=monolithic"
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MONOLITHIC_KERNEL=1
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else
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logtext "Result: Found modular kernel"
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report "linux_kernel_type=modular"
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MONOLITHIC_KERNEL=0
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fi
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else
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logtext "Test skipped, no lsmod binary found"
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# Exception?
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5726
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# Description : Checking Linux loaded kernel modules
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Register --test-no KRNL-5726 --os Linux --weight L --network NO --description "Checking Linux loaded kernel modules"
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if [ ${SKIPTEST} -eq 0 ]; then
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if [ ! "${LSMODBINARY}" = "" ]; then
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FIND=`lsmod | awk '{ if ($1!="Module") print $1 }' | sort`
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Display --indent 2 --text "- Checking loaded kernel modules" --result DONE --color GREEN
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if [ ! "${FIND}" = "" ]; then
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logtext "Loaded modules according lsmod:"
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N=0
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for I in ${FIND}; do
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logtext "Loaded module: ${I}"
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report "loaded_kernel_module[]=${I}"
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N=`expr ${N} + 1`
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done
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Display --indent 6 --text "Found ${N} active modules"
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else
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logtext "Result: no loaded modules found"
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logtext "Notice: No loaded kernel modules could indicate a broken/malformed lsmod, or a (custom) monolithic kernel"
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fi
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else
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logtext "Test skipped, no lsmod binary found"
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# Exception?
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5728
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# Description : Checking for available Linux kernel configuration file in /boot
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Register --test-no KRNL-5728 --os Linux --weight L --network NO --description "Checking Linux kernel config"
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if [ ${SKIPTEST} -eq 0 ]; then
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LINUXCONFIGFILE="/boot/config-`uname -r`"
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if [ -f ${LINUXCONFIGFILE} ]; then
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logtext "Result: found config (${LINUXCONFIGFILE})"
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Display --indent 2 --text "- Checking Linux kernel configuration file" --result FOUND --color GREEN
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else
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logtext "Result: no Linux kernel configuration file found in /boot"
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Display --indent 2 --text "- Checking Linux kernel configuration file" --result "NOT FOUND" --color WHITE
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5730
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# Description : Checking default I/O kernel scheduler
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PREQS_MET="NO"
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if [ ! "${LINUXCONFIGFILE}" = "" ]; then
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if [ -f ${LINUXCONFIGFILE} ]; then PREQS_MET="YES"; fi
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fi
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Register --test-no KRNL-5730 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking disk I/O kernel scheduler"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Checking the default I/O kernel scheduler"
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LINUX_KERNEL_IOSCHED=`${GREPBINARY} "CONFIG_DEFAULT_IOSCHED" ${LINUXCONFIGFILE} | awk -F= '{ print $2 }' | sed s/\"//g`
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if [ ! "${LINUX_KERNEL_IOSCHED}" = "" ]; then
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logtext "Result: found IO scheduler '${LINUX_KERNEL_IOSCHED}'"
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Display --indent 2 --text "- Checking default I/O kernel scheduler" --result FOUND --color GREEN
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report "linux_kernel_io_scheduler[]=${LINUX_KERNEL_IOSCHED}"
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else
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logtext "Result: no default i/o kernel scheduler found"
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Display --indent 2 --text "- Checking default I/O kernel scheduler" --result "NOT FOUND" --color WHITE
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fi
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fi
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#
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#################################################################################
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#
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# YYY Check for kernel options
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#
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#################################################################################
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#
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# Test : KRNL-5745
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# Description : Checking FreeBSD loaded kernel modules
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Register --test-no KRNL-5745 --os FreeBSD --weight L --network NO --description "Checking FreeBSD loaded kernel modules"
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if [ ${SKIPTEST} -eq 0 ]; then
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Display --indent 2 --text "- Checking active kernel modules"
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logtext "Test: ${KERNEL_ACTIVE_MODULES_TITLE}"
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logtext "Description: ${KERNEL_ACTIVE_MODULES_DESCRIPTION}"
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logtext "Action: Checking modules"
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if [ -f /sbin/kldstat ]; then
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FIND=`kldstat | grep -v 'Name' | tr -s ' ' | cut -d ' ' -f6`
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if [ $? -eq 0 ]; then
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logtext "Loaded modules according kldstat:"
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N=0
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for I in ${FIND}; do
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logtext "Loaded module: ${I}"
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report "loaded_kernel_module[]=${I}"
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N=`expr ${N} + 1`
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done
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Display --indent 4 --text "Found ${N} kernel modules" --result DONE --color GREEN
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else
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Display --indent 4 --text "Test failed" --result WARNING --color RED
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logtext "Result: Problem with executing kldstat"
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fi
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else
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echo "[ ${WHITE}SKIPPED${NORMAL} ]"
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logtext "Result: no results, can't find /sbin/kldstat"
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5770
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# Description : Checking Solaris load modules
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Register --test-no KRNL-5770 --os Solaris --weight L --network NO --description "Checking active kernel modules"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: searching loaded kernel modules"
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FIND=`modinfo -c -w | grep -v "UNLOADED" | grep LOADED | awk '{ print $3 }' | sort`
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if [ ! "${FIND}" = "" ]; then
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for I in ${FIND}; do
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logtext "Found module: ${I}"
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report "loaded_kernel_module[]=${I}"
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done
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Display --indent 2 --text "- Checking Solaris active kernel modules" --result DONE --color GREEN
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else
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logtext "Result: no output"
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Display --indent 2 --text "- Checking Solaris active kernel modules" --result UNKNOWN --color YELLOW
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5788
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# Description : Checking availability new kernel
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if [ "${LINUX_VERSION}" = "Debian" -o "${LINUX_VERSION}" = "Ubuntu" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
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Register --test-no KRNL-5788 --os Linux --preqs-met ${PREQS_MET} --weight L --network NO --description "Checking availability new Linux kernel"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Searching apt-cache, to determine if a newer kernel is available"
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if [ -x /usr/bin/apt-cache ]; then
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logtext "Result: found /usr/bin/apt-cache"
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# YYY Test for presence /usr/bin/apt-cache and dpkg
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logtext "Test: checking readlink location of /vmlinuz"
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FINDKERNFILE=`readlink -f /vmlinuz`
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logtext "Output: readlink reported file ${FINDKERNFILE}"
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logtext "Test: checking package from dpkg -S"
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FINDKERNEL=`dpkg -S ${FINDKERNFILE} 2> /dev/null | awk -F : '{print $1}'`
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logtext "Output: dpkg -S reported package ${FINDKERNEL}"
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logtext "Test: Using apt-cache policy to determine if there is an update available"
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FINDINST=`apt-cache policy ${FINDKERNEL} | egrep 'Installed' | cut -d ':' -f2 | tr -d ' '`
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FINDCAND=`apt-cache policy ${FINDKERNEL} | egrep 'Candidate' | cut -d ':' -f2 | tr -d ' '`
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logtext "Kernel installed: ${FINDINST}"
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logtext "Kernel candidate: ${FINDCAND}"
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if [ "${FINDINST}" = "" ]; then
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Display --indent 2 --text "- Checking for available kernel update" --result UNKNOWN --color YELLOW
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logtext "Result: Exception occured, no output from apt-cache policy"
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ReportException "${TEST_NO}:01"
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logtext "Exception: apt-cache policy did not return an installed kernel version"
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ReportSuggestion ${TEST_NO} "Check the output of apt-cache policy manually to determine why output is empty"
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else
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if [ "${FINDINST}" = "${FINDCAND}" ]; then
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Display --indent 2 --text "- Checking for available kernel update" --result OK --color GREEN
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logtext "Result: no kernel update available"
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else
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Display --indent 2 --text "- Checking for available kernel update" --result "UPDATE AVAILABLE" --color YELLOW
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logtext "Result: kernel update available according 'apt-cache policy'."
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ReportSuggestion ${TEST_NO} "Determine priority for available kernel update"
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fi
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fi
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else
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logtext "Result: could NOT find /usr/bin/apt-cache, skipped other tests."
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5820
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# Description : Checking core dumps configuration (Linux)
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Register --test-no KRNL-5820 --os Linux --weight L --network NO --description "Checking core dumps configuration"
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if [ ${SKIPTEST} -eq 0 ]; then
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logtext "Test: Checking presence /etc/security/limits.conf"
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if [ -f /etc/security/limits.conf ]; then
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logtext "Result: file /etc/security/limits.conf exists"
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logtext "Test: Checking if core dumps are disabled in /etc/security/limits.conf"
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FIND1=`cat /etc/security/limits.conf | grep -v "^#" | grep -v "^$" | awk '{ if ($1=="*" && $2=="soft" && $3=="core") { print "soft core enabled" } }'`
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FIND2=`cat /etc/security/limits.conf | grep -v "^#" | grep -v "^$" | awk '{ if ($1=="*" && $2=="hard" && $3=="core") { print "hard core enabled" } }'`
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if [ "${FIND1}" = "soft core enabled" -o "${FIND2}" = "hard core enabled" ]; then
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logtext "Result: core dumps (soft or hard) are enabled"
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Display --indent 2 --text "- Checking core dumps configuration" --result ENABLED --color YELLOW
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#YYY suggestion
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AddHP 1 2
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else
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logtext "Result: core dumps (soft and hard) are both disabled"
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Display --indent 2 --text "- Checking core dumps configuration" --result DISABLED --color GREEN
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CORE_DUMPS_DISABLED=1
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AddHP 3 3
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fi
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# Sysctl option
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logtext "Test: Checking sysctl value of fs.suid_dumpable"
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FIND=`${SYSCTLBINARY} fs.suid_dumpable 2> /dev/null | awk '{ if ($1=="fs.suid_dumpable") { print $3 } }'`
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if [ "${FIND}" = "" ]; then
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logtext "Result: value ${FIND} found"
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else
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logtext "Result: sysctl key fs.suid_dumpable not found"
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fi
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if [ "${FIND}" = "2" ]; then
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logtext "Result: programs can dump core dump, but only readable by root (value 2, for debugging with file protection)"
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Display --indent 4 --text "- Checking setuid core dumps configuration" --result PROTECTED --color GREEN
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AddHP 1 1
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elif [ "${FIND}" = "1" ]; then
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logtext "Result: all programs can perform core dumps (value 1, for debugging)"
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Display --indent 2 --text "- Checking setuid core dumps configuration" --result DEBUG --color YELLOW
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ReportSuggestion ${TEST_NO} "Determine if really all binaries need to be able to core dump"
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AddHP 0 1
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else
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logtext "Result: found default option, some programs can dump (not processes which need to change credentials)"
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Display --indent 4 --text "- Checking setuid core dumps configuration" --result DEFAULT --color YELLOW
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AddHP 1 1
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fi
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# Check ulimit settings and harden it
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# echo 'ulimit -S -c 0 > /dev/null 2>&1' >> /etc/profile
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else
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logtext "Result: file /etc/security/limits.conf does not exist, skipping test"
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fi
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fi
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#
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#################################################################################
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#
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# Test : KRNL-5826
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# Description : Checking core dumps configuration (Solaris)
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#Register --test-no KRNL-5826 --os Linux --weight L --network NO --description "Checking core dumps configuration"
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#if [ ${SKIPTEST} -eq 0 ]; then
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#
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#################################################################################
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#
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# Test : KRNL-5830
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# Description : Check if system needs a reboot (Linux only)
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Register --test-no KRNL-5830 --os Linux --weight L --network NO --description "Checking if running on the latest kernel"
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if [ ${SKIPTEST} -eq 0 ]; then
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REBOOT_NEEDED=2
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FILE="/var/run/reboot-required.pkgs"
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logtext "Test: Checking presence ${FILE}"
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if [ -f ${FILE} ]; then
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logtext "Result: file ${FILE} exists"
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FIND=`cat ${FILE}`
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if [ "${FIND}" = "" ]; then
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logtext "Result: No reboot needed (file empty)"
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REBOOT_NEEDED=0
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else
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PKGSCOUNT=`cat ${FILE} | wc -l`
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logtext "Result: reboot is needed, related to ${PKGSCOUNT} packages"
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for I in ${FIND}; do
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logtext "Package: ${I}"
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done
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REBOOT_NEEDED=1
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fi
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else
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logtext "Result: file ${FILE} not found"
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fi
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# Check if /boot exists
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if [ -d /boot ]; then
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if [ -f /boot/vmlinuz ]; then
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logtext "Result: found /boot/vmlinuz"
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ReportException "${TEST_NO}:1" "Can't determine kernel version on disk, need debug data"
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else
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logtext "Result: /boot/vmlinuz not on disk, trying to find /boot/vmlinuz*"
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FIND=`ls /boot/vmlinuz* 2> /dev/null`
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if [ "${FIND}" = "" ]; then
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logtext "Result: No kernels (/boot/vmlinuz*) found on disk"
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ReportException "${TEST_NO}:2" "Can not find any vmlinuz files in /boot, which is unexpected"
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else
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MYKERNEL=`uname -r | sed 's/\.[a-z].*.//g' | sed 's/-[a-z].*.//g'`
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logtext "Result: using ${MYKERNEL} as my kernel version (stripped)"
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KERNELS=`ls /boot/vmlinuz* | sed 's/vmlinuz-//' | sed 's/\.[a-z].*.//g' | sed 's/-[a-z].*.//g' | sed 's./boot/..' | sort`
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FOUND_KERNEL=0
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for I in ${KERNELS}; do
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if [ ${FOUND_KERNEL} -eq 1 ]; then
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logtext "Result: found a kernel (${I}) later than running one (${MYKERNEL})"
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REBOOT_NEEDED=1
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fi
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if [ "${MYKERNEL}" = "${I}" ]; then
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FOUND_KERNEL=1
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logtext "Result: Found ${I} (= our kernel)"
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else
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logtext "Result: Found ${I}"
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fi
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done
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# Check if we at least found the kernel on disk
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if [ ${FOUND_KERNEL} -eq 0 ]; then
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ReportException "${TEST_NO}:3" "Could not find our running kernel on disk, which is unexpected"
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else
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# If we are not sure yet reboot it needed, but we found running kernel as last one on disk, we run latest kernel
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if [ ${REBOOT_NEEDED} -eq 2 ]; then
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logtext "Result: we found our kernel on disk as last entry, so seems to be up-to-date"
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REBOOT_NEEDED=0
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fi
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fi
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fi
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fi
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else
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logtext "Result: /boot does not exist"
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fi
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# Display discovered status
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if [ ${REBOOT_NEEDED} -eq 0 ]; then
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Display --indent 2 --text "- Check if reboot is needed" --result NO --color GREEN
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AddHP 5 5
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elif [ ${REBOOT_NEEDED} -eq 1 ]; then
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Display --indent 2 --text "- Check if reboot is needed" --result YES --color RED
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ReportWarning ${TEST_NO} "H" "Reboot of system is most likely needed"
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AddHP 0 5
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else
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Display --indent 2 --text "- Check if reboot is needed" --result UNKNOWN --color YELLOW
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fi
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fi
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#
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#################################################################################
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#
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wait_for_keypress
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#
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#================================================================================
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# Lynis - Copyright 2007-2014, Michael Boelen - http://cisofy.com - The Netherlands
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