@ -9,6 +9,7 @@ package tsnet
import (
"context"
crand "crypto/rand"
"crypto/tls"
"encoding/hex"
"errors"
"fmt"
@ -415,9 +416,9 @@ func (s *Server) start() (reterr error) {
if err != nil {
return err
}
if err := os . MkdirAll ( s . rootPath , 0700 ) ; err != nil {
return err
}
}
if err := os . MkdirAll ( s . rootPath , 0700 ) ; err != nil {
return err
}
if fi , err := os . Stat ( s . rootPath ) ; err != nil {
return err
@ -645,7 +646,7 @@ func networkForFamily(netBase string, is6 bool) string {
// - ("tcp", "", port)
//
// The netBase is "tcp" or "udp" (without any '4' or '6' suffix).
func ( s * Server ) listenerForDstAddr ( netBase string , dst netip . AddrPort ( _ * listener , ok bool ) {
func ( s * Server ) listenerForDstAddr ( netBase string , dst netip . AddrPort , funnel bool ) ( _ * listener , ok bool ) {
s . mu . Lock ( )
defer s . mu . Unlock ( )
for _ , a := range [ 2 ] netip . Addr { 0 : dst . Addr ( ) } {
@ -653,7 +654,7 @@ func (s *Server) listenerForDstAddr(netBase string, dst netip.AddrPort) (_ *list
networkForFamily ( netBase , dst . Addr ( ) . Is6 ( ) ) ,
netBase ,
} {
if ln , ok := s . listeners [ listenKey { net , a , dst . Port ( ) ] ; ok {
if ln , ok := s . listeners [ listenKey { net , a , dst . Port ( ) , funnel }] ; ok {
return ln , true
}
}
@ -675,7 +676,7 @@ func (s *Server) getTCPHandlerForFunnelFlow(src netip.AddrPort, dstPort uint16)
}
dst = netip . AddrPortFrom ( ipv6 , dstPort )
}
ln , ok := s . listenerForDstAddr ( "tcp" , dst
ln , ok := s . listenerForDstAddr ( "tcp" , dst , true )
if ! ok {
return nil
}
@ -683,7 +684,7 @@ func (s *Server) getTCPHandlerForFunnelFlow(src netip.AddrPort, dstPort uint16)
}
func ( s * Server ) getTCPHandlerForFlow ( src , dst netip . AddrPort ) ( handler func ( net . Conn ) , intercept bool ) {
ln , ok := s . listenerForDstAddr ( "tcp" , dst
ln , ok := s . listenerForDstAddr ( "tcp" , dst , false )
if ! ok {
return nil , true // don't handle, don't forward to localhost
}
@ -691,7 +692,7 @@ func (s *Server) getTCPHandlerForFlow(src, dst netip.AddrPort) (handler func(net
}
func ( s * Server ) getUDPHandlerForFlow ( src , dst netip . AddrPort ) ( handler func ( nettype . ConnPacketConn ) , intercept bool ) {
ln , ok := s . listenerForDstAddr ( "udp" , dst
ln , ok := s . listenerForDstAddr ( "udp" , dst , false )
if ! ok {
return nil , true // don't handle, don't forward to localhost
}
@ -760,6 +761,136 @@ func (s *Server) APIClient() (*tailscale.Client, error) {
// Listen announces only on the Tailscale network.
// It will start the server if it has not been started yet.
func ( s * Server ) Listen ( network , addr string ) ( net . Listener , error ) {
return s . listen ( network , addr , listenOnTailnet )
}
// ListenTLS announces only on the Tailscale network.
// It returns a TLS listener wrapping the tsnet listener.
// It will start the server if it has not been started yet.
func ( s * Server ) ListenTLS ( network string , addr string ) ( net . Listener , error ) {
if network != "tcp" {
return nil , fmt . Errorf ( "ListenTLS(%q, %q): only tcp is supported" , network , addr )
}
ctx := context . Background ( )
st , err := s . Up ( ctx )
if err != nil {
return nil , err
}
if len ( st . CertDomains ) == 0 {
return nil , errors . New ( "tsnet: you must enable HTTPS in the admin panel to proceed" )
}
lc , err := s . LocalClient ( ) // do local client first before listening.
if err != nil {
return nil , err
}
ln , err := s . listen ( network , addr , listenOnTailnet )
if err != nil {
return nil , err
}
return tls . NewListener ( ln , & tls . Config {
GetCertificate : lc . GetCertificate ,
} ) , nil
}
// FunnelOption is an option passed to ListenFunnel to configure the listener.
type FunnelOption interface {
funnelOption ( )
}
type funnelOnly int
func ( funnelOnly ) funnelOption ( ) { }
// FunnelOnly configures the listener to only respond to connections from Tailscale Funnel.
// The local tailnet will not be able to connect to the listener.
func FunnelOnly ( ) FunnelOption { return funnelOnly ( 1 ) }
// ListenFunnel announces on the public internet using Tailscale Funnel.
//
// It also by default listens on your local tailnet, so connections can
// come from either inside or outside your network. To restrict connections
// to be just from the internet, use the FunnelOnly option.
//
// Currently (2023-03-10), Funnel only supports TCP on ports 443, 8443, and 10000.
// The supported host name is limited to that configured for the tsnet.Server.
// As such, the standard way to create funnel is:
//
// s.ListenFunnel("tcp", ":443")
//
// and the only other supported addrs currently are ":8443" and ":10000".
//
// It will start the server if it has not been started yet.
func ( s * Server ) ListenFunnel ( network string , addr string , opts ... FunnelOption ) ( net . Listener , error ) {
if network != "tcp" {
return nil , fmt . Errorf ( "ListenFunnel(%q, %q): only tcp is supported" , network , addr )
}
switch addr {
case ":443" , ":8443" , ":10000" :
default :
return nil , fmt . Errorf ( ` ListenFunnel(%q, %q): only valid addrs are ":443", ":8443", and ":10000" ` , network , addr )
}
ctx := context . Background ( )
st , err := s . Up ( ctx )
if err != nil {
return nil , err
}
if len ( st . CertDomains ) == 0 {
return nil , errors . New ( "tsnet: you must enable HTTPS in the admin panel to proceed" )
}
if err := ipn . CheckFunnelAccess ( st . Self . Capabilities ) ; err != nil {
return nil , err
}
lc , err := s . LocalClient ( ) // do local client first before listening.
if err != nil {
return nil , err
}
// May not have funnel enabled. Enable it.
srvConfig , err := lc . GetServeConfig ( ctx )
if err != nil {
return nil , err
}
if srvConfig == nil {
srvConfig = & ipn . ServeConfig { }
}
domain := st . CertDomains [ 0 ]
hp := ipn . HostPort ( domain + addr ) // valid only because of the strong restrictions on addr above
if ! srvConfig . AllowFunnel [ hp ] {
mak . Set ( & srvConfig . AllowFunnel , hp , true )
srvConfig . AllowFunnel [ hp ] = true
if err := lc . SetServeConfig ( ctx , srvConfig ) ; err != nil {
return nil , err
}
}
// Start a funnel listener.
lnOn := listenOnBoth
for _ , opt := range opts {
if _ , ok := opt . ( funnelOnly ) ; ok {
lnOn = listenOnFunnel
}
}
ln , err := s . listen ( network , addr , lnOn )
if err != nil {
return nil , err
}
return tls . NewListener ( ln , & tls . Config {
GetCertificate : lc . GetCertificate ,
} ) , nil
}
type listenOn string
const (
listenOnTailnet = listenOn ( "listen-on-tailnet" )
listenOnFunnel = listenOn ( "listen-on-funnel" )
listenOnBoth = listenOn ( "listen-on-both" )
)
func ( s * Server ) listen ( network , addr string , lnOn listenOn ) ( net . Listener , error ) {
switch network {
case "" , "tcp" , "tcp4" , "tcp6" , "udp" , "udp4" , "udp6" :
default :
@ -794,20 +925,37 @@ func (s *Server) Listen(network, addr string) (net.Listener, error) {
return nil , err
}
key := listenKey { network , bindHostOrZero , uint16 ( port ) }
var keys [ ] listenKey
switch lnOn {
case listenOnTailnet :
keys = append ( keys , listenKey { network , bindHostOrZero , uint16 ( port ) , false } )
case listenOnFunnel :
keys = append ( keys , listenKey { network , bindHostOrZero , uint16 ( port ) , true } )
case listenOnBoth :
keys = append ( keys , listenKey { network , bindHostOrZero , uint16 ( port ) , false } )
keys = append ( keys , listenKey { network , bindHostOrZero , uint16 ( port ) , true } )
}
ln := & listener {
s : s ,
key : key ,
key s : key s ,
addr : addr ,
conn : make ( chan net . Conn ) ,
}
s . mu . Lock ( )
if _ , ok := s . listeners [ key ] ; ok {
s . mu . Unlock ( )
return nil , fmt . Errorf ( "tsnet: listener already open for %s, %s" , network , addr )
for _ , key := range keys {
if _ , ok := s . listeners [ key ] ; ok {
s . mu . Unlock ( )
return nil , fmt . Errorf ( "tsnet: listener already open for %s, %s" , network , addr )
}
}
if s . listeners == nil {
s . listeners = make ( map [ listenKey ] * listener )
}
for _ , key := range keys {
s . listeners [ key ] = ln
}
mak . Set ( & s . listeners , key , ln )
s . mu . Unlock ( )
return ln , nil
}
@ -816,11 +964,12 @@ type listenKey struct {
network string
host netip . Addr // or zero value for unspecified
port uint16
funnel bool
}
type listener struct {
s * Server
key listenKey
key s [ ] listenKey
addr string
conn chan net . Conn
}
@ -837,10 +986,12 @@ func (ln *listener) Addr() net.Addr { return addr{ln} }
func ( ln * listener ) Close ( ) error {
ln . s . mu . Lock ( )
defer ln . s . mu . Unlock ( )
if v , ok := ln . s . listeners [ ln . key ] ; ok && v == ln {
delete ( ln . s . listeners , ln . key )
close ( ln . conn )
for _ , key := range ln . keys {
if v , ok := ln . s . listeners [ key ] ; ok && v == ln {
delete ( ln . s . listeners , key )
}
}
close ( ln . conn )
return nil
}
@ -861,5 +1012,5 @@ func (ln *listener) Server() *Server { return ln.s }
type addr struct { ln * listener }
func ( a addr ) Network ( ) string { return a . ln . key . network }
func ( a addr ) Network ( ) string { return a . ln . key s[ 0 ] . network }
func ( a addr ) String ( ) string { return a . ln . addr }
Maisem Ali
1 year ago
committed by