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#!/bin/sh
#################################################################################
#
# Lynis
# ------------------
#
# Copyright (c) Michael Boelen, CISOfy, and many contributors.
#
# Website : https://cisofy.com/
# Blog : https://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.
#
#################################################################################
if [ $# -eq 0 ]; then
Display --indent 2 --text "${RED}Error: ${WHITE}Provide a file${NORMAL}"
Display --text " "; Display --text " "
ExitFatal
else
FILE=$(echo $1 | grep -E "^http|https")
if HasData "${FILE}"; then
echo "Provide a file (not a URL)"
ExitFatal
else
if [ -f $1 ]; then
AUDIT_FILE="$1"
else
Display --indent 2 --text "File $1 does not exist"
ExitFatal
fi
fi
Display --indent 2 --text "File to audit = ${AUDIT_FILE}"
fi
#####################################################
#
##################################################################################################
#
InsertSection "${SECTION_IMAGE}"
PKGMGR=""
FIND=$(grep "^FROM" ${AUDIT_FILE} | sed 's/ /:space:/g')
for I in ${FIND}; do
IMAGE=$(echo ${I} | sed 's/:space:/ /g' | awk '{ if ($1=="FROM") { print $2 }}')
TAG=$(echo ${IMAGE} | cut -d':' -f2)
Display --indent 2 --text "Found image:" --result "${IMAGE}"
IS_DEBIAN=$(echo ${IMAGE} | grep -i debian)
IS_FEDORA=$(echo ${IMAGE} | grep -i fedora)
IS_UBUNTU=$(echo ${IMAGE} | grep -i ubuntu)
IS_ALPINE=$(echo ${IMAGE} | grep -i alpine)
IS_LATEST=$(echo ${TAG} | grep -i latest)
if [ -n "${IS_DEBIAN}" ]; then IMAGE="debian"; fi
if [ -n "${IS_FEDORA}" ]; then IMAGE="fedora"; fi
if [ -n "${IS_UBUNTU}" ]; then IMAGE="ubuntu"; fi
if [ -n "${IS_ALPINE}" ]; then IMAGE="alpine"; fi
if [ -n "${IS_LATEST}" ]; then
ReportWarning "dockerfile" "latest TAG used. Specifying a targeted OS image and version is better for reproducible results."
fi
case ${IMAGE} in
"debian")
LogText "Image = Debian based"
PKGMGR="apt"
;;
"fedora*")
LogText " Image = Fedora based"
PKGMGR="yum"
;;
"ubuntu")
LogText " Image = Ubuntu based"
PKGMGR="apt"
;;
"alpine")
LogText " Image = Alpine based"
PKGMGR="apk"
;;
*)
Display --indent 2 --text "Unknown image" --result "" --color YELLOW
;;
esac
done
#
##################################################################################################
#
InsertSection "${SECTION_BASICS}"
MAINTAINER=$(grep -E -i "*MAINTAINER" ${AUDIT_FILE} | sed 's/=/ /g' | cut -d'"' -f 2)
if [ -z "${MAINTAINER}" ]; then
ReportWarning "dockerfile" "No maintainer found. Unclear who created this file."
else
Display --indent 2 --text "Maintainer" --result "${MAINTAINER}"
fi
ENTRYPOINT=$(grep "^ENTRYPOINT" ${AUDIT_FILE} | cut -d' ' -f2 )
if [ -z "${ENTRYPOINT}" ]; then
ReportWarning "dockerfile" "No ENTRYPOINT defined in Dockerfile."
else
Display --indent 2 --text "ENTRYPOINT" --result "${ENTRYPOINT}"
fi
FIND=$(grep "^CMD" ${AUDIT_FILE} | cut -d' ' -f2 )
if [ -z "${FIND}" ]; then
ReportWarning "dockerfile" "No CMD defines in Dockerfile."
else
CMD=$(echo ${FIND})
Display --indent 2 --text "CMD" --result "${CMD}"
fi
FIND=$(grep "^USER" ${AUDIT_FILE} | cut -d' ' -f2 )
if [ -z "${FIND}" ]; then
ReportWarning "dockerfile" "No user declared in Dockerfile. Container will execute command as root"
else
USER=$(echo ${FIND})
Display --indent 2 --text "User" --result "${USER}"
fi
#
##################################################################################################
#
InsertSection "${SECTION_SOFTWARE}"
case $PKGMGR in
"apt")
FIND=$(grep -E "apt-get(.*) install" ${AUDIT_FILE})
if [ ! "${FIND}" = "" ]; then
LogText "Found installation via apt-get"
else
LogText "No installations found via apt-get"
fi
;;
"apk")
FIND=$(grep -E "apk(.*) add" ${AUDIT_FILE})
if [ ! "${FIND}" = "" ]; then
LogText "Found installation via apk"
else
LogText "No installations found via apk"
fi
;;
*)
LogText "Unknown package manager"
;;
esac
FIND=$(grep -E " (gcc|libc6-dev|make)" ${AUDIT_FILE} | grep -v "^#")
if [ ! "${FIND}" = "" ]; then
ReportWarning "dockerfile" "Possible development utilities found, which is not advised for production environment"
LogText "Details: ${FIND}"
fi
# SSH
FIND_OPENSSH=$(grep openssh ${AUDIT_FILE})
if [ ! "${FIND_OPENSSH}" = "" ]; then
Display --indent 2 --text "OpenSSH" --result "FOUND" --color RED
ReportSuggestion "dockerfile" "Don't use OpenSSH in container, use 'docker exec' instead"
fi
#
##################################################################################################
#
InsertSection "${SECTION_DOWNLOADS}"
FILE_DOWNLOAD=0
LogText "Checking usage of cURL"
FIND_CURL=$(grep curl ${AUDIT_FILE})
if [ ! "${FIND_CURL}" = "" ]; then
Display --indent 4 --text "Download tool" --result "curl"
FILE_DOWNLOAD=1
fi
LogText "Checking usage of wget"
FIND_WGET=$(grep wget ${AUDIT_FILE})
if HasData "${FIND_WGET}"; then
Display --indent 4 --text "Download tool" --result "wget"
FILE_DOWNLOAD=1
fi
FIND=$(grep "^ADD http" ${AUDIT_FILE})
if HasData "${FIND}"; then
FILE_DOWNLOAD=1
ReportWarning "dockerfile" "Found download of file via ADD. Unclear if the integrity of this file is checked, or file is signed"
LogText "Details: ${FIND}"
fi
if [ ${FILE_DOWNLOAD} -eq 1 ]; then
SSL_USED_FIND=$(grep -E "(https)" ${AUDIT_FILE})
if HasData "${SSL_USED_FIND}"; then
SSL_USED="YES"
COLOR="GREEN"
else
SSL_USED="NO"
COLOR="RED"
ReportSuggestion "Use SSL downloads when possible to increase security (DNSSEC, HTTPS, validation of domain, avoid MitM)"
fi
Display --indent 2 --text "Integrity testing performed" --result "${SSL_USED}" --color ${COLOR}
HASHING_USED=$(grep -E "(sha1sum|sha256sum|sha512sum)" ${AUDIT_FILE})
Display --indent 2 --text "Hashing" --result "${HASHING_USED}"
KEYS_USED=$(grep -E "(apt-key adv)" ${AUDIT_FILE}| sed 's/RUN apt-key adv//g'| sed 's/--keyserver/Key Server:/g' | sed 's/--recv/Key Value:/g')
Display --indent 2 --text "Signing keys used" --result "${KEYS_USED}"
Display --indent 2 --text "All downloads properly checked" --result "?"
else
Display --indent 2 --text "No files seems to be downloaded in this Dockerfile"
fi
#
##################################################################################################
#
InsertSection "${SECTION_PERMISSIONS}"
FIND=$(grep -i "chmod 777" ${AUDIT_FILE})
if HasData "${FIND}"; then
ReportWarning "dockerfile" "Warning: chmod 777 found"
fi
#
##################################################################################################
#
# Removing temp file
LogText "Action: Removing temporary file ${TMP_FILE}"
if [ -f ${TMP_FILE} ]; then
rm -f ${TMP_FILE}
fi
# EOF
|
