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// +build linux
// Copyright 2018 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package firewall
import (
"fmt"
"strings"
"github.com/godbus/dbus"
)
const (
dbusName = "org.freedesktop.DBus"
dbusPath = "/org/freedesktop/DBus"
dbusGetNameOwnerMethod = "GetNameOwner"
firewalldName = "org.fedoraproject.FirewallD1"
firewalldPath = "/org/fedoraproject/FirewallD1"
firewalldZoneInterface = "org.fedoraproject.FirewallD1.zone"
firewalldAddSourceMethod = "addSource"
firewalldRemoveSourceMethod = "removeSource"
errZoneAlreadySet = "ZONE_ALREADY_SET"
)
// Only used for testcases to override the D-Bus connection
var testConn *dbus.Conn
type fwdBackend struct {
conn *dbus.Conn
}
// fwdBackend implements the FirewallBackend interface
var _ FirewallBackend = &fwdBackend{}
func getConn() (*dbus.Conn, error) {
if testConn != nil {
return testConn, nil
}
return dbus.SystemBus()
}
// isFirewalldRunning checks whether firewalld is running.
func isFirewalldRunning() bool {
conn, err := getConn()
if err != nil {
return false
}
dbusObj := conn.Object(dbusName, dbusPath)
var res string
if err := dbusObj.Call(dbusName+"."+dbusGetNameOwnerMethod, 0, firewalldName).Store(&res); err != nil {
return false
}
return true
}
func newFirewalldBackend() (FirewallBackend, error) {
conn, err := getConn()
if err != nil {
return nil, err
}
backend := &fwdBackend{
conn: conn,
}
return backend, nil
}
func getFirewalldZone(conf *FirewallNetConf) string {
if conf.FirewalldZone != "" {
return conf.FirewalldZone
}
return "trusted"
}
func (fb *fwdBackend) Add(conf *FirewallNetConf) error {
zone := getFirewalldZone(conf)
for _, ip := range conf.PrevResult.IPs {
ipStr := ipString(ip.Address)
// Add a firewalld rule which assigns the given source IP to the given zone
firewalldObj := fb.conn.Object(firewalldName, firewalldPath)
var res string
if err := firewalldObj.Call(firewalldZoneInterface+"."+firewalldAddSourceMethod, 0, zone, ipStr).Store(&res); err != nil {
if !strings.Contains(err.Error(), errZoneAlreadySet) {
return fmt.Errorf("failed to add the address %v to %v zone: %v", ipStr, zone, err)
}
}
}
return nil
}
func (fb *fwdBackend) Del(conf *FirewallNetConf) error {
for _, ip := range conf.PrevResult.IPs {
ipStr := ipString(ip.Address)
// Remove firewalld rules which assigned the given source IP to the given zone
firewalldObj := fb.conn.Object(firewalldName, firewalldPath)
var res string
firewalldObj.Call(firewalldZoneInterface+"."+firewalldRemoveSourceMethod, 0, getFirewalldZone(conf), ipStr).Store(&res)
}
return nil
}
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