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Fixing "Security check failed" message for unprivileged mode. Issue 1383 #1385

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Fixing "Security check failed" message for unprivileged mode. Issue 1383 #1385

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5 changes: 5 additions & 0 deletions include/functions
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Original file line number Diff line number Diff line change
Expand Up @@ -3103,6 +3103,11 @@
unsafe=1
LogText "Security alert: file is not owned by active user, but can write to it"
fi
# File is not owned by active user, and not readable by him
if [ ! -O "${FILE}" -a ! -r "${FILE}" ]; then
unsafe=1
LogText "Security alert: file is not readable by active user"
fi
fi

# Check file permissions
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24 changes: 18 additions & 6 deletions lynis
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Original file line number Diff line number Diff line change
Expand Up @@ -148,13 +148,25 @@
# Perform a basic check for permissions. After including functions, using SafePerms()
IGNORE_FILE_PERMISSION_ISSUES=0

FILES_TO_CHECK="consts functions"
FILES_TO_CHECK="consts functions parameters binaries osdetection data_upload"

ISSUE=0
ISSUE_TYPE=""
SHOWPERMERROR=0

for FILE in ${FILES_TO_CHECK}; do
SUGGESTED_PERMS=640
if [ ${PRIVILEGED} -eq 0 ]; then
SUGGESTED_PERMS=644
fi

# First check if files are readable so the shell can execute them
if [ ! -r ${INCLUDEDIR}/${FILE} ]; then
ISSUE=1
ISSUE_TYPE="perms"
echo "[!] Change file permissions of ${INCLUDEDIR}/${FILE} to ${SUGGESTED_PERMS}."; echo " Command: chmod ${SUGGESTED_PERMS} ${INCLUDEDIR}/${FILE}"
fi

PERMS=$(ls -l ${INCLUDEDIR}/${FILE} | cut -c 2-10)
GROUPPERMS=$(ls -l ${INCLUDEDIR}/${FILE} | cut -c 5-7)
GROUPOWNERID=$(ls -n ${INCLUDEDIR}/${FILE} | awk '{ print $4 }')
Expand All @@ -163,11 +175,11 @@

# Check permissions of include/X file (400, 600, 640, 644)
if [ "${PERMS}" = "rwxrwxrwx" ]; then
ISSUE=1; ISSUE_TYPE="perms"; echo "[!] Change file permissions of ${INCLUDEDIR}/${FILE} to 640."; echo " Command: chmod 640 ${INCLUDEDIR}/${FILE}"
ISSUE=1; ISSUE_TYPE="perms"; echo "[!] Change file permissions of ${INCLUDEDIR}/${FILE} to ${SUGGESTED_PERMS}."; echo " Command: chmod ${SUGGESTED_PERMS} ${INCLUDEDIR}/${FILE}"
elif [ ! "${PERMS}" = "r--------" -a ! "${PERMS}" = "rw-------" -a ! "${PERMS}" = "rw-r-----" -a ! "${PERMS}" = "rw-r--r--" ]; then
# If group ID equals user ID, we consider permissions to be fine (probably default umask)
if [ ! "${GROUPOWNERID}" = "${OWNERID}" ]; then
ISSUE=1; ISSUE_TYPE="perms"; echo "[!] Change file permissions of ${INCLUDEDIR}/${FILE} to 640."; echo " Command: chmod 640 ${INCLUDEDIR}/${FILE}"
ISSUE=1; ISSUE_TYPE="perms"; echo "[!] Change file permissions of ${INCLUDEDIR}/${FILE} to ${SUGGESTED_PERMS}."; echo " Command: chmod ${SUGGESTED_PERMS} ${INCLUDEDIR}/${FILE}"
fi
fi

Expand All @@ -193,7 +205,7 @@
if [ ${ISSUE} -eq 1 ]; then
printf "\n[X] Security check failed\n\n Why do I see this error?\n -------------------------------\n This is a protection mechanism to prevent the root user from executing user created files. The files may be altered, or including malicious pieces of script.\n\n What can I do?\n ---------------------\n Option 1) Check if a trusted user created the files (e.g. due to using Git, Homebrew or similar).\n If you trust these files, you can decide to continue this run by pressing ENTER.\n"
if [ "${ISSUE_TYPE}" = "perms" ]; then
printf "\n Option 2) Change permissions of the related files.\n\n Commands (full directory):\n # chmod 640 include/*\n # ./lynis audit system"
printf "\n Option 2) Change permissions of the related files.\n\n Commands (full directory):\n # chmod ${SUGGESTED_PERMS} include/*\n # ./lynis audit system"
elif [ "${ISSUE_TYPE}" = "owner" ]; then
printf "\n Option 2) Change ownership of the related files (or full directory).\n\n Commands (full directory):\n # cd ..\n # chown -R 0:0 lynis\n # cd lynis\n # ./lynis audit system"
fi
Expand Down Expand Up @@ -1036,7 +1048,7 @@ ${NORMAL}
if SafeFile ${INCLUDE_FILE}; then
. ${INCLUDE_FILE}
else
LogText "Exception: skipping test category ${INCLUDE_TEST}, file ${INCLUDE_FILE} has bad permissions (should be 640, 600 or 400)"
LogText "Exception: skipping test category ${INCLUDE_TEST}, file ${INCLUDE_FILE} has bad permissions (should be 644, 640, 600 or 400)"
ReportWarning "NONE" "Invalid permissions on tests file tests_${INCLUDE_TEST}"
# Insert a section and warn user also on screen
InsertSection "${SECTION_GENERAL}"
Expand All @@ -1063,7 +1075,7 @@ ${NORMAL}
LogText "Result: file permissions fine, running custom tests"
. ${INCLUDEDIR}/tests_custom
else
LogText "Exception: skipping custom tests, file has bad permissions (should be 640, 600 or 400)"
LogText "Exception: skipping custom tests, file has bad permissions (should be 644, 640, 600 or 400)"
ReportWarning "NONE" "Invalid permissions on custom tests file"
Display --indent 2 --text "- Running custom tests... " --result "${STATUS_WARNING}" --color RED
fi
Expand Down