mirror of
https://github.com/ovh/debian-cis.git
synced 2024-11-25 23:11:24 +01:00
873ef8827d
On systems where /etc/sudoers.d might be updated often by some automated means, this check might raise a critical when a previously present file (during the ls) is no longer present (during its attempted read), so before raising a critical, re-check that it does exists first.
137 lines
4.4 KiB
Bash
Executable File
137 lines
4.4 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# OVH Security audit
|
|
#
|
|
|
|
#
|
|
# 99.1.3 Check there are no carte-blanche authorization in sudoers file(s).
|
|
#
|
|
|
|
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="Checks there are no carte-blanche authorization in sudoers file(s)."
|
|
|
|
FILE="/etc/sudoers"
|
|
DIRECTORY="/etc/sudoers.d"
|
|
# spaces will be expanded to [[:space:]]* when using the regex
|
|
# improves readability in audit report
|
|
REGEX="ALL = \( ALL( : ALL)? \)( NOPASSWD:)? ALL"
|
|
EXCEPT=""
|
|
MAX_FILES_TO_LOG=0
|
|
|
|
# This function will be called if the script status is on enabled / audit mode
|
|
audit() {
|
|
# expand spaces to [[:space:]]*
|
|
# shellcheck disable=2001
|
|
REGEX="$(echo "$REGEX" | sed 's/ /[[:space:]]*/g')"
|
|
|
|
local skiplog
|
|
skiplog=0
|
|
if [ $MAX_FILES_TO_LOG != 0 ]; then
|
|
# if we have more than $MAX_FILES_TO_LOG files in $DIRECTORY, we'll reduce
|
|
# logging in the loop, to avoid flooding the logs and getting timed out
|
|
local nbfiles
|
|
# shellcheck disable=2012 # (find is too slow and calls fstatat() for each file)
|
|
nbfiles=$(ls -f "$DIRECTORY" | wc -l)
|
|
if [ "$nbfiles" -gt "$MAX_FILES_TO_LOG" ]; then
|
|
skiplog=1
|
|
info "Found $nbfiles files in $DIRECTORY (> $MAX_FILES_TO_LOG), we won't log every file we check"
|
|
fi
|
|
fi
|
|
|
|
FILES=""
|
|
if $SUDO_CMD [ ! -r "$FILE" ]; then
|
|
crit "$FILE is not readable"
|
|
return
|
|
fi
|
|
FILES="$FILE"
|
|
if $SUDO_CMD [ ! -d "$DIRECTORY" ]; then
|
|
debug "$DIRECTORY does not exist"
|
|
elif $SUDO_CMD [ ! -x "$DIRECTORY" ]; then
|
|
crit "Cannot browse $DIRECTORY"
|
|
else
|
|
FILES="$FILES $($SUDO_CMD ls -1 $DIRECTORY | sed s=^=$DIRECTORY/=)"
|
|
fi
|
|
for file in $FILES; do
|
|
if $SUDO_CMD [ ! -r "$file" ]; then
|
|
debug "$file is not readable, but it might just have disappeared since we've listed the folder contents, re-check that it exists"
|
|
if $SUDO_CMD [ -e "$file" ]; then
|
|
crit "$file is not readable"
|
|
else
|
|
debug "$file has disappeared, ignore it"
|
|
continue
|
|
fi
|
|
else
|
|
if ! $SUDO_CMD grep -E "$REGEX" "$file" &>/dev/null; then
|
|
if [ $skiplog = 0 ]; then
|
|
ok "There is no carte-blanche sudo permission in $file"
|
|
fi
|
|
else
|
|
RET=$($SUDO_CMD grep -E "$REGEX" "$file" | sed 's/\t/#/g;s/ /#/g')
|
|
for line in $RET; do
|
|
if grep -q "$(echo "$line" | cut -d '#' -f 1)" <<<"$EXCEPT"; then
|
|
# shellcheck disable=2001
|
|
ok "$(echo "$line" | sed 's/#/ /g') is present in $file but was EXCUSED because $(echo "$line" | cut -d '#' -f 1) is part of exceptions."
|
|
continue
|
|
fi
|
|
# shellcheck disable=2001
|
|
crit "$(echo "$line" | sed 's/#/ /g') is present in $file"
|
|
done
|
|
fi
|
|
fi
|
|
done
|
|
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled mode
|
|
apply() {
|
|
:
|
|
}
|
|
|
|
# This function will create the config file for this check with default values
|
|
create_config() {
|
|
cat <<EOF
|
|
status=audit
|
|
|
|
# Put EXCEPTION account names here, space separated
|
|
EXCEPT="root %root %sudo %wheel"
|
|
|
|
# If we find more than this amount of files in sudoers.d/,
|
|
# we'll reduce the logging in the loop to avoid getting
|
|
# timed out because we spend too much time logging.
|
|
# Using 0 disables this feature and will never reduce the
|
|
# logging, regardless of the number of files.
|
|
MAX_FILES_TO_LOG=0
|
|
EOF
|
|
}
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
:
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
if [ -z "$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
|