mirror of
https://github.com/ovh/debian-cis.git
synced 2024-11-22 13:37:02 +01:00
94 lines
3.1 KiB
Bash
Executable File
94 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# CIS Debian Hardening
|
|
#
|
|
|
|
#
|
|
# 6.1.13 Audit SUID executables (Not Scored)
|
|
#
|
|
|
|
set -e # One error, it's over
|
|
set -u # One variable unset, it's over
|
|
|
|
# shellcheck disable=2034
|
|
HARDENING_LEVEL=2
|
|
# shellcheck disable=2034
|
|
DESCRIPTION="Find SUID system executables."
|
|
IGNORED_PATH=''
|
|
|
|
# This function will be called if the script status is on enabled / audit mode
|
|
audit() {
|
|
info "Checking if there are suid files"
|
|
if [ -n "$IGNORED_PATH" ]; then
|
|
# maybe IGNORED_PATH allow us to filter out some FS
|
|
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}' | grep -vE "$IGNORED_PATH")
|
|
|
|
# shellcheck disable=2086
|
|
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -regextype 'egrep' ! -regex $IGNORED_PATH -print)
|
|
else
|
|
FS_NAMES=$(df --local -P | awk '{if (NR!=1) print $6}')
|
|
|
|
# shellcheck disable=2086
|
|
FOUND_BINARIES=$($SUDO_CMD find $FS_NAMES -xdev -ignore_readdir_race -type f -perm -4000 -print)
|
|
fi
|
|
|
|
BAD_BINARIES=""
|
|
for BINARY in $FOUND_BINARIES; do
|
|
if grep -qw "$BINARY" <<<"$EXCEPTIONS"; then
|
|
debug "$BINARY is confirmed as an exception"
|
|
else
|
|
BAD_BINARIES="$BAD_BINARIES $BINARY"
|
|
fi
|
|
done
|
|
if [ -n "$BAD_BINARIES" ]; then
|
|
crit "Some suid files are present"
|
|
# shellcheck disable=SC2001
|
|
FORMATTED_RESULT=$(sed "s/ /\n/g" <<<"$BAD_BINARIES" | sort | uniq | tr '\n' ' ')
|
|
crit "$FORMATTED_RESULT"
|
|
else
|
|
ok "No unknown suid files found"
|
|
fi
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled mode
|
|
apply() {
|
|
info "Removing suid on valid binary may seriously harm your system, report only here"
|
|
}
|
|
|
|
# This function will create the config file for this check with default values
|
|
create_config() {
|
|
cat <<EOF
|
|
status=audit
|
|
# Put Here your valid suid binaries so that they do not appear during the audit
|
|
EXCEPTIONS="/bin/mount /usr/bin/mount /bin/ping /usr/bin/ping /bin/ping6 /usr/bin/ping6 /bin/su /usr/bin/su /bin/umount /usr/bin/umount /usr/bin/chfn /usr/bin/chsh /usr/bin/fping /usr/bin/fping6 /usr/bin/gpasswd /usr/bin/mtr /usr/bin/newgrp /usr/bin/passwd /usr/bin/sudo /usr/bin/sudoedit /usr/lib/openssh/ssh-keysign /usr/lib/pt_chown /usr/bin/at"
|
|
EOF
|
|
}
|
|
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
# No param for this function
|
|
:
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
if [ -z "$CIS_ROOT_DIR" ]; then
|
|
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
|
echo "Cannot source CIS_ROOT_DIR variable, aborting."
|
|
exit 128
|
|
fi
|
|
|
|
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
|
if [ -r "$CIS_ROOT_DIR"/lib/main.sh ]; then
|
|
# shellcheck source=../../lib/main.sh
|
|
. "$CIS_ROOT_DIR"/lib/main.sh
|
|
else
|
|
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_ROOT_DIR in /etc/default/cis-hardening"
|
|
exit 128
|
|
fi
|