mirror of
https://github.com/netbirdio/netbird.git
synced 2024-11-30 03:54:35 +01:00
108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
//go:build !android
|
|
|
|
package firewall
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"os"
|
|
|
|
"github.com/coreos/go-iptables/iptables"
|
|
"github.com/google/nftables"
|
|
log "github.com/sirupsen/logrus"
|
|
|
|
nbiptables "github.com/netbirdio/netbird/client/firewall/iptables"
|
|
firewall "github.com/netbirdio/netbird/client/firewall/manager"
|
|
nbnftables "github.com/netbirdio/netbird/client/firewall/nftables"
|
|
"github.com/netbirdio/netbird/client/firewall/uspfilter"
|
|
)
|
|
|
|
const (
|
|
// UNKNOWN is the default value for the firewall type for unknown firewall type
|
|
UNKNOWN FWType = iota
|
|
// IPTABLES is the value for the iptables firewall type
|
|
IPTABLES
|
|
// NFTABLES is the value for the nftables firewall type
|
|
NFTABLES
|
|
)
|
|
|
|
// SKIP_NFTABLES_ENV is the environment variable to skip nftables check
|
|
const SKIP_NFTABLES_ENV = "NB_SKIP_NFTABLES_CHECK"
|
|
|
|
// FWType is the type for the firewall type
|
|
type FWType int
|
|
|
|
func NewFirewall(context context.Context, iface IFaceMapper) (firewall.Manager, error) {
|
|
// on the linux system we try to user nftables or iptables
|
|
// in any case, because we need to allow netbird interface traffic
|
|
// so we use AllowNetbird traffic from these firewall managers
|
|
// for the userspace packet filtering firewall
|
|
var fm firewall.Manager
|
|
var errFw error
|
|
|
|
switch check() {
|
|
case IPTABLES:
|
|
log.Debug("creating an iptables firewall manager")
|
|
fm, errFw = nbiptables.Create(context, iface)
|
|
if errFw != nil {
|
|
log.Errorf("failed to create iptables manager: %s", errFw)
|
|
}
|
|
case NFTABLES:
|
|
log.Debug("creating an nftables firewall manager")
|
|
fm, errFw = nbnftables.Create(context, iface)
|
|
if errFw != nil {
|
|
log.Errorf("failed to create nftables manager: %s", errFw)
|
|
}
|
|
default:
|
|
errFw = fmt.Errorf("no firewall manager found")
|
|
log.Debug("no firewall manager found, try to use userspace packet filtering firewall")
|
|
}
|
|
|
|
if iface.IsUserspaceBind() {
|
|
var errUsp error
|
|
if errFw == nil {
|
|
fm, errUsp = uspfilter.CreateWithNativeFirewall(iface, fm)
|
|
} else {
|
|
fm, errUsp = uspfilter.Create(iface)
|
|
}
|
|
if errUsp != nil {
|
|
log.Debugf("failed to create userspace filtering firewall: %s", errUsp)
|
|
return nil, errUsp
|
|
}
|
|
|
|
if err := fm.AllowNetbird(); err != nil {
|
|
log.Errorf("failed to allow netbird interface traffic: %v", err)
|
|
}
|
|
return fm, nil
|
|
}
|
|
|
|
if errFw != nil {
|
|
return nil, errFw
|
|
}
|
|
|
|
return fm, nil
|
|
}
|
|
|
|
// check returns the firewall type based on common lib checks. It returns UNKNOWN if no firewall is found.
|
|
func check() FWType {
|
|
nf := nftables.Conn{}
|
|
if _, err := nf.ListChains(); err == nil && os.Getenv(SKIP_NFTABLES_ENV) != "true" {
|
|
return NFTABLES
|
|
}
|
|
|
|
ip, err := iptables.NewWithProtocol(iptables.ProtocolIPv4)
|
|
if err != nil {
|
|
return UNKNOWN
|
|
}
|
|
if isIptablesClientAvailable(ip) {
|
|
return IPTABLES
|
|
}
|
|
|
|
return UNKNOWN
|
|
}
|
|
|
|
func isIptablesClientAvailable(client *iptables.IPTables) bool {
|
|
_, err := client.ListChains("filter")
|
|
return err == nil
|
|
}
|