mirror of https://github.com/CISOfy/lynis.git
186 lines
9.2 KiB
Bash
186 lines
9.2 KiB
Bash
#!/bin/sh
|
|
|
|
#################################################################################
|
|
#
|
|
# Lynis
|
|
# ------------------
|
|
#
|
|
# Copyright 2007-2013, Michael Boelen
|
|
# Copyright 2007-2020, 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.
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Home directories
|
|
#
|
|
#################################################################################
|
|
#
|
|
InsertSection "${SECTION_HOME_DIRECTORIES}"
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Ignore some top level directories (not the sub directories below)
|
|
IGNORE_HOME_DIRS="/bin /boot /cdrom /dev /etc /home /lib /lib64 /media /mnt
|
|
/opt /proc /sbin /selinux /srv /sys /tmp /usr /var"
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9302
|
|
# Description : Create list with home directories
|
|
Register --test-no HOME-9302 --weight L --network NO --category security --description "Create list with home directories"
|
|
if [ ${SKIPTEST} -eq 0 ]; then
|
|
# Read sixth field of /etc/passwd
|
|
LogText "Test: query ${ROOTDIR}etc/passwd to obtain home directories"
|
|
FIND=$(${AWKBINARY} -F: '{ if ($1 !~ "#") print $6 }' ${ROOTDIR}etc/passwd | ${SORTBINARY} -u)
|
|
for I in ${FIND}; do
|
|
if [ -d ${I} ]; then
|
|
LogText "Result: found home directory: ${I} (directory exists)"
|
|
Report "home_directory[]=${I}"
|
|
else
|
|
LogText "Result: found home directory: ${I} (directory does not exist)"
|
|
fi
|
|
done
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9304
|
|
# Description : Check if users' home directories permissions are 750 or more restrictive
|
|
Register --test-no HOME-9304 --weight L --network NO --category security --description "Check if users' home directories permissions are 750 or more restrictive"
|
|
if [ ${SKIPTEST} -eq 0 ]; then
|
|
# Check if users' home directories permissions are 750 or more restrictive
|
|
FOUND=0
|
|
USERDATA=$(${EGREPBINARY} -v '^(daemon|git|halt|root|shutdown|sync)' ${ROOTDIR}etc/passwd | ${AWKBINARY} -F: '($7 !~ "/(false|nologin)$") { print }')
|
|
while read -r LINE; do
|
|
USER=$(echo ${LINE} | ${CUTBINARY} -d: -f1)
|
|
DIR=$(echo ${LINE} | ${CUTBINARY} -d: -f6)
|
|
LogText "Test: checking directory '${DIR}' for user '${USER}'"
|
|
if [ -d "${DIR}" ]; then
|
|
WRITE_GROUP_PERM=$(${LSBINARY} -ld ${DIR} | ${CUTBINARY} -f1 -d" " | ${CUTBINARY} -c6)
|
|
OTHER_PERMS=$(${LSBINARY} -ld ${DIR} | ${CUTBINARY} -f1 -d" " | ${CUTBINARY} -c8-10)
|
|
if [ ! ${WRITE_GROUP_PERM} = "-" -o ! ${OTHER_PERMS} = "---" ]; then
|
|
LogText "Result: permissions of home directory ${DIR} of user ${USER} are not strict enough. Should be 750 or more restrictive. Change with: chmod 750 ${DIR}"
|
|
FOUND=1
|
|
else
|
|
LogText "Result: permissions of home directory ${DIR} of user ${USER} are fine"
|
|
fi
|
|
fi
|
|
done << EOF
|
|
${USERDATA}
|
|
EOF
|
|
|
|
if [ ${FOUND} -eq 1 ]; then
|
|
Display --indent 2 --text "- Permissions of home directories" --result "${STATUS_WARNING}" --color RED
|
|
ReportSuggestion "${TEST_NO}" "Double check the permissions of home directories as some might be not strict enough."
|
|
else
|
|
Display --indent 2 --text "- Permissions of home directories" --result "${STATUS_OK}" --color GREEN
|
|
LogText "Result: OK, all permissions of the home directories are 750 or more restrictive"
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9306
|
|
# Description : Check if users own their home directories
|
|
Register --test-no HOME-9306 --weight L --network NO --category security --description "Check if users own their home directories"
|
|
if [ ${SKIPTEST} -eq 0 ]; then
|
|
# Check if users own their home directories
|
|
FOUND=0
|
|
USERDATA=$(${EGREPBINARY} -v '^(daemon|git|halt|root|shutdown|sync)' ${ROOTDIR}etc/passwd | ${AWKBINARY} -F: '($7 !~ "/(false|nologin)$") { print }')
|
|
while read -r LINE; do
|
|
USER=$(echo ${LINE} | ${CUTBINARY} -d: -f1)
|
|
DIR=$(echo ${LINE} | ${CUTBINARY} -d: -f6)
|
|
LogText "Test: checking directory '${DIR}' for user '${USER}'"
|
|
if [ -d "${DIR}" ]; then
|
|
OWNER=$(ls -ld ${DIR} | awk -F" " '{ print $3 }')
|
|
if [ ! "${OWNER}" = "${USER}" ]; then
|
|
LogText "Result: the home directory ${DIR} of user ${USER} is owned by ${OWNER}. Correct: chown ${USER} ${DIR}"
|
|
FOUND=1
|
|
else
|
|
LogText "Result: ownership of home directory ${DIR} for user ${USER} looks to be correct"
|
|
fi
|
|
fi
|
|
done << EOF
|
|
${USERDATA}
|
|
EOF
|
|
|
|
if [ ${FOUND} -eq 1 ]; then
|
|
Display --indent 2 --text "- Ownership of home directories" --result "${STATUS_WARNING}" --color RED
|
|
ReportSuggestion "${TEST_NO}" "Double check the ownership of home directories as some might be incorrect."
|
|
else
|
|
Display --indent 2 --text "- Ownership of home directories" --result "${STATUS_OK}" --color GREEN
|
|
LogText "Result: OK, all users own their home directories"
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9310
|
|
# Description : Check for suspicious shell history files
|
|
Register --test-no HOME-9310 --weight L --network NO --category security --description "Checking for suspicious shell history files"
|
|
if [ ${SKIPTEST} -eq 0 ]; then
|
|
if [ -n "${HOMEDIRS}" ]; then
|
|
if [ "${OS}" = "Solaris" ]; then
|
|
# Solaris doesn't support -maxdepth
|
|
FIND=$(${FINDBINARY} ${HOMEDIRS} -name ".*history" ! -type f -print)
|
|
else
|
|
FIND=$(${FINDBINARY} ${HOMEDIRS} -maxdepth 1 -name ".*history" ! -type f -print)
|
|
fi
|
|
if [ -z "${FIND}" ]; then
|
|
Display --indent 2 --text "- Checking shell history files" --result "${STATUS_OK}" --color GREEN
|
|
LogText "Result: Ok, history files are type 'file'."
|
|
else
|
|
Display --indent 2 --text "- Checking shell history files" --result "${STATUS_WARNING}" --color RED
|
|
LogText "Result: the following files seem to be of the wrong file type:"
|
|
LogText "Output: ${FIND}"
|
|
LogText "Info: above files could be redirected files to avoid logging and should be investigated"
|
|
ReportWarning "${TEST_NO}" "Incorrect file type found for shell history file"
|
|
fi
|
|
LogText "Remark: History files are normally of the type 'file'. Symbolic links and other types are suspicious."
|
|
else
|
|
Display --indent 2 --text "- Checking shell history files" --result "${STATUS_SKIPPED}" --color WHITE
|
|
LogText "Result: Homedirs is empty, therefore test will be skipped"
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9314
|
|
# Description : Check if non local paths are found in PATH, which can be a risk, but also bad for performance
|
|
# (like searching on a filer, instead of local disk)
|
|
#Register --test-no HOME-9314 --weight L --network NO --category security --description "Create list with home directories"
|
|
#
|
|
#################################################################################
|
|
#
|
|
# Test : HOME-9350
|
|
# Description : Scan home directories for specific files, used in different tests later
|
|
# Notes : For performance reasons we combine the scanning of different files, so inode caching is used
|
|
# as much as possible for every find command
|
|
# Profile opt : ignore-home-dir (multiple lines allowed), ignores home directory
|
|
if [ -n "${REPORTFILE}" ]; then PREQS_MET="YES"; else PREQS_MET="NO"; fi
|
|
Register --test-no HOME-9350 --preqs-met ${PREQS_MET} --weight L --network NO --category security --description "Collecting information from home directories"
|
|
if [ ${SKIPTEST} -eq 0 ]; then
|
|
IGNORE_HOME_DIRS=$(${GREPBINARY} "^ignore-home-dir=" ${REPORTFILE} | ${AWKBINARY} -F= '{ print $2 }')
|
|
if [ -z "${IGNORE_HOME_DIRS}" ]; then
|
|
LogText "Result: IGNORE_HOME_DIRS empty, no paths excluded"
|
|
else
|
|
LogText "Output: ${IGNORE_HOME_DIRS}"
|
|
fi
|
|
fi
|
|
#
|
|
#################################################################################
|
|
#
|
|
|
|
WaitForKeyPress
|
|
|
|
#
|
|
#================================================================================
|
|
# Lynis - Security Auditing and System Hardening for Linux and UNIX - https://cisofy.com
|