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External NAT IP mapping support (#487)

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* External NAT IP mapping support

* Ignore blacklisted interfaces, even if in user specified in  mapping
This commit is contained in:
Tom Kunicki 2022-11-23 02:42:12 -05:00 committed by GitHub
parent 53c532bbb4
commit f604956246
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 120 additions and 17 deletions
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1
.gitignore vendored
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@ -11,3 +11,4 @@ infrastructure_files/docker-compose.yml
*.syso
client/.distfiles/
infrastructure_files/setup.env
.vscode

24
client/internal/config.go
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@ -3,6 +3,9 @@ package internal
import (
"context"
"fmt"
"net/url"
"os"
"github.com/netbirdio/netbird/client/ssh"
"github.com/netbirdio/netbird/iface"
mgm "github.com/netbirdio/netbird/management/client"
@ -11,8 +14,6 @@ import (
"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"net/url"
"os"
)
var managementURLDefault *url.URL
@ -40,7 +41,24 @@ type Config struct {
WgPort int
IFaceBlackList []string
// SSHKey is a private SSH key in a PEM format
SSHKey string
SSHKey string
// ExternalIP mappings, if different than the host interface IP
//
// External IP must not be behind a CGNAT and port-forwarding for incoming UDP packets from WgPort on ExternalIP
// to WgPort on host interface IP must be present. This can take form of single port-forwarding rule, 1:1 DNAT
// mapping ExternalIP to host interface IP, or a NAT DMZ to host interface IP.
//
// A single mapping will take the form of: external[/internal]
// external (required): either the external IP address or "stun" to use STUN to determine the external IP address
// internal (optional): either the internal/interface IP address or an interface name
//
// examples:
// "12.34.56.78" => all interfaces IPs will be mapped to external IP of 12.34.56.78
// "12.34.56.78/eth0" => IPv4 assigned to interface eth0 will be mapped to external IP of 12.34.56.78
// "12.34.56.78/10.1.2.3" => interface IP 10.1.2.3 will be mapped to external IP of 12.34.56.78
NATExternalIPs []string
}
// createNewConfig creates a new config generating a new Wireguard key and saving to file

6
client/internal/connect.go
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@ -3,11 +3,12 @@ package internal
import (
"context"
"fmt"
"github.com/netbirdio/netbird/client/ssh"
nbStatus "github.com/netbirdio/netbird/client/status"
"strings"
"time"
"github.com/netbirdio/netbird/client/ssh"
nbStatus "github.com/netbirdio/netbird/client/status"
"github.com/netbirdio/netbird/client/system"
"github.com/netbirdio/netbird/iface"
@ -190,6 +191,7 @@ func createEngineConfig(key wgtypes.Key, config *Config, peerConfig *mgmProto.Pe
WgPrivateKey: key,
WgPort: config.WgPort,
SSHKey: []byte(config.SSHKey),
NATExternalIPs: config.NATExternalIPs,
}
if config.PreSharedKey != "" {

90
client/internal/engine.go
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@ -3,12 +3,6 @@ package internal
import (
"context"
"fmt"
"github.com/netbirdio/netbird/client/internal/dns"
"github.com/netbirdio/netbird/client/internal/routemanager"
nbssh "github.com/netbirdio/netbird/client/ssh"
nbstatus "github.com/netbirdio/netbird/client/status"
nbdns "github.com/netbirdio/netbird/dns"
"github.com/netbirdio/netbird/route"
"math/rand"
"net"
"net/netip"
@ -18,6 +12,13 @@ import (
"sync"
"time"
"github.com/netbirdio/netbird/client/internal/dns"
"github.com/netbirdio/netbird/client/internal/routemanager"
nbssh "github.com/netbirdio/netbird/client/ssh"
nbstatus "github.com/netbirdio/netbird/client/status"
nbdns "github.com/netbirdio/netbird/dns"
"github.com/netbirdio/netbird/route"
"github.com/netbirdio/netbird/client/internal/peer"
"github.com/netbirdio/netbird/client/internal/proxy"
"github.com/netbirdio/netbird/iface"
@ -66,6 +67,8 @@ type EngineConfig struct {
// SSHKey is a private SSH key in a PEM format
SSHKey []byte
NATExternalIPs []string
}
// Engine is a mechanism responsible for reacting on Signal and Management stream events and managing connections to the remote peers.
@ -825,6 +828,7 @@ func (e Engine) createPeerConn(pubKey string, allowedIPs string) (*peer.Conn, er
UDPMuxSrflx: e.udpMuxSrflx,
ProxyConfig: proxyConfig,
LocalWgPort: e.config.WgPort,
NATExternalIPs: e.parseNATExternalIPMappings(),
}
peerConn, err := peer.NewConn(config, e.statusRecorder)
@ -918,3 +922,77 @@ func (e *Engine) receiveSignalEvents() {
e.signal.WaitStreamConnected()
}
func (e* Engine) parseNATExternalIPMappings() []string {
var mappedIPs []string
var ignoredIFaces = make(map[string]interface{})
for _, iFace := range(e.config.IFaceBlackList) {
ignoredIFaces[iFace] = nil
}
for _, mapping := range e.config.NATExternalIPs {
var external, internal string
var externalIP, internalIP net.IP
var err error
split := strings.Split(mapping, "/")
if len(split) > 2 {
log.Warnf("ignoring invalid external mapping '%s', too many delimiters", mapping)
break
}
if len(split) > 1 {
internal = split[1]
internalIP = net.ParseIP(internal)
if internalIP == nil {
// not a properly formatted IP address, maybe it's interface name?
if _, present := ignoredIFaces[internal]; present {
log.Warnf("internal interface '%s' in blacklist, ignoring external mapping '%s'", internal, mapping)
break
}
internalIP, err = findIPFromInterfaceName(internal)
if err != nil {
log.Warnf("error finding interface IP for interface '%s', ignoring external mapping '%s': %v", internal, mapping, err)
break
}
}
}
external = split[0]
externalIP = net.ParseIP(external)
if externalIP == nil {
log.Warnf("invalid external IP, ignoring external IP mapping '%s'", mapping)
break
}
if externalIP != nil {
mappedIP := externalIP.String()
if internalIP != nil {
mappedIP = mappedIP + "/" + internalIP.String()
}
mappedIPs = append(mappedIPs, mappedIP)
log.Infof("parsed external IP mapping of '%s' as '%s'", mapping, mappedIP)
}
}
if len(mappedIPs) != len(e.config.NATExternalIPs) {
log.Warnf("one or more external IP mappings failed to parse, ignoring all mappings")
return nil
}
return mappedIPs
}
func findIPFromInterfaceName(ifaceName string) (net.IP, error) {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return nil, err
}
return findIPFromInterface(iface)
}
func findIPFromInterface(iface *net.Interface) (net.IP, error) {
ifaceAddrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, addr := range ifaceAddrs {
if ipv4Addr := addr.(*net.IPNet).IP.To4(); ipv4Addr != nil {
return ipv4Addr, nil
}
}
return nil, fmt.Errorf("interface %s don't have an ipv4 address", iface.Name)
}

14
client/internal/peer/conn.go
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@ -2,18 +2,18 @@ package peer
import (
"context"
nbStatus "github.com/netbirdio/netbird/client/status"
"github.com/netbirdio/netbird/client/system"
"github.com/netbirdio/netbird/iface"
"golang.zx2c4.com/wireguard/wgctrl"
"net"
"strings"
"sync"
"time"
"github.com/netbirdio/netbird/client/internal/proxy"
nbStatus "github.com/netbirdio/netbird/client/status"
"github.com/netbirdio/netbird/client/system"
"github.com/netbirdio/netbird/iface"
"github.com/pion/ice/v2"
log "github.com/sirupsen/logrus"
"golang.zx2c4.com/wireguard/wgctrl"
)
// ConnConfig is a peer Connection configuration
@ -39,6 +39,8 @@ type ConnConfig struct {
UDPMuxSrflx ice.UniversalUDPMux
LocalWgPort int
NATExternalIPs []string
}
// OfferAnswer represents a session establishment offer or answer
@ -152,6 +154,7 @@ func (conn *Conn) reCreateAgent() error {
InterfaceFilter: interfaceFilter(conn.config.InterfaceBlackList),
UDPMux: conn.config.UDPMux,
UDPMuxSrflx: conn.config.UDPMuxSrflx,
NAT1To1IPs: conn.config.NATExternalIPs,
})
if err != nil {
return err
@ -284,7 +287,7 @@ func (conn *Conn) Open() error {
host, _, _ := net.SplitHostPort(remoteConn.LocalAddr().String())
rhost, _, _ := net.SplitHostPort(remoteConn.RemoteAddr().String())
// direct Wireguard connection
log.Infof("directly connected to peer %s [laddr <-> raddr] [%s:%d <-> %s:%d]", conn.config.Key, host, iface.DefaultWgPort, rhost, iface.DefaultWgPort)
log.Infof("directly connected to peer %s [laddr <-> raddr] [%s:%d <-> %s:%d]", conn.config.Key, host, conn.config.LocalWgPort, rhost, remoteWgPort)
} else {
log.Infof("connected to peer %s [laddr <-> raddr] [%s <-> %s]", conn.config.Key, remoteConn.LocalAddr().String(), remoteConn.RemoteAddr().String())
}
@ -448,6 +451,7 @@ func (conn *Conn) SetSignalCandidate(handler func(candidate ice.Candidate) error
// and then signals them to the remote peer
func (conn *Conn) onICECandidate(candidate ice.Candidate) {
if candidate != nil {
// TODO: reported port is incorrect for CandidateTypeHost, makes understanding ICE use via logs confusing as port is ignored
log.Debugf("discovered local candidate %s", candidate.String())
go func() {
err := conn.signalCandidate(candidate)