debian-cis/bin/hardening/6.1.11_find_unowned_files.sh

#!/bin/bash

# run-shellcheck
#
# CIS Debian Hardening
#

#
# 6.1.11 Ensure no unowned files or directories exist
#

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="Ensure no unowned files or directories exist"

USER='root'
EXCLUDED=''

# This function will be called if the script status is on enabled / audit mode
audit() {
    info "Checking if there are unowned files"
    FS_NAMES=$(df --local -P | awk {'if (NR!=1) print $6'})
    if [ -n "$EXCLUDED" ]; then
        RESULT=$($SUDO_CMD find $FS_NAMES -xdev -nouser -regextype 'egrep' ! -regex "$EXCLUDED" -print 2>/dev/null)
    else
        RESULT=$($SUDO_CMD find $FS_NAMES -xdev -nouser -print 2>/dev/null)
    fi
    if [ -n "$RESULT" ]; then
        crit "Some unowned files are present"
        FORMATTED_RESULT=$(sed "s/ /\n/g" <<<$RESULT | sort | uniq | tr '\n' ' ')
        crit "$FORMATTED_RESULT"
    else
        ok "No unowned files found"
    fi
}

# This function will be called if the script status is on enabled mode
apply() {
    if [ -n "$EXCLUDED" ]; then
        RESULT=$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nouser -regextype 'egrep' ! -regex "$EXCLUDED" -ls 2>/dev/null)
    else
        RESULT=$(df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nouser -ls 2>/dev/null)
    fi
    if [ -n "$RESULT" ]; then
        warn "Applying chown on all unowned files in the system"
        df --local -P | awk {'if (NR!=1) print $6'} | xargs -I '{}' find '{}' -xdev -nouser -print 2>/dev/null | xargs chown $USER
    else
        ok "No unowned files found, nothing to apply"
    fi
}

# 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