mirror of https://github.com/tailscale/tailscale/
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
399 lines
8.9 KiB
Go
399 lines
8.9 KiB
Go
// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package controlhttp
|
|
|
|
import (
|
|
"context"
|
|
"crypto/tls"
|
|
"fmt"
|
|
"io"
|
|
"log"
|
|
"net"
|
|
"net/http"
|
|
"net/http/httputil"
|
|
"net/url"
|
|
"strconv"
|
|
"sync"
|
|
"testing"
|
|
|
|
"tailscale.com/control/controlbase"
|
|
"tailscale.com/net/socks5"
|
|
"tailscale.com/types/key"
|
|
)
|
|
|
|
func TestControlHTTP(t *testing.T) {
|
|
tests := []struct {
|
|
name string
|
|
proxy proxy
|
|
}{
|
|
// direct connection
|
|
{
|
|
name: "no_proxy",
|
|
proxy: nil,
|
|
},
|
|
// SOCKS5
|
|
{
|
|
name: "socks5",
|
|
proxy: &socksProxy{},
|
|
},
|
|
// HTTP->HTTP
|
|
{
|
|
name: "http_to_http",
|
|
proxy: &httpProxy{
|
|
useTLS: false,
|
|
allowConnect: false,
|
|
allowHTTP: true,
|
|
},
|
|
},
|
|
// HTTP->HTTPS
|
|
{
|
|
name: "http_to_https",
|
|
proxy: &httpProxy{
|
|
useTLS: false,
|
|
allowConnect: true,
|
|
allowHTTP: false,
|
|
},
|
|
},
|
|
// HTTP->any (will pick HTTP)
|
|
{
|
|
name: "http_to_any",
|
|
proxy: &httpProxy{
|
|
useTLS: false,
|
|
allowConnect: true,
|
|
allowHTTP: true,
|
|
},
|
|
},
|
|
// HTTPS->HTTP
|
|
{
|
|
name: "https_to_http",
|
|
proxy: &httpProxy{
|
|
useTLS: true,
|
|
allowConnect: false,
|
|
allowHTTP: true,
|
|
},
|
|
},
|
|
// HTTPS->HTTPS
|
|
{
|
|
name: "https_to_https",
|
|
proxy: &httpProxy{
|
|
useTLS: true,
|
|
allowConnect: true,
|
|
allowHTTP: false,
|
|
},
|
|
},
|
|
// HTTPS->any (will pick HTTP)
|
|
{
|
|
name: "https_to_any",
|
|
proxy: &httpProxy{
|
|
useTLS: true,
|
|
allowConnect: true,
|
|
allowHTTP: true,
|
|
},
|
|
},
|
|
}
|
|
|
|
for _, test := range tests {
|
|
t.Run(test.name, func(t *testing.T) {
|
|
testControlHTTP(t, test.proxy)
|
|
})
|
|
}
|
|
}
|
|
|
|
func testControlHTTP(t *testing.T, proxy proxy) {
|
|
client, server := key.NewMachine(), key.NewMachine()
|
|
|
|
sch := make(chan serverResult, 1)
|
|
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
conn, err := AcceptHTTP(context.Background(), w, r, server)
|
|
if err != nil {
|
|
log.Print(err)
|
|
}
|
|
res := serverResult{
|
|
err: err,
|
|
}
|
|
if conn != nil {
|
|
res.clientAddr = conn.RemoteAddr().String()
|
|
res.version = conn.ProtocolVersion()
|
|
res.peer = conn.Peer()
|
|
res.conn = conn
|
|
}
|
|
sch <- res
|
|
})
|
|
|
|
httpLn, err := net.Listen("tcp", "127.0.0.1:0")
|
|
if err != nil {
|
|
t.Fatalf("HTTP listen: %v", err)
|
|
}
|
|
httpsLn, err := net.Listen("tcp", "127.0.0.1:0")
|
|
if err != nil {
|
|
t.Fatalf("HTTPS listen: %v", err)
|
|
}
|
|
|
|
httpServer := &http.Server{Handler: handler}
|
|
go httpServer.Serve(httpLn)
|
|
defer httpServer.Close()
|
|
|
|
httpsServer := &http.Server{
|
|
Handler: handler,
|
|
TLSConfig: tlsConfig(t),
|
|
}
|
|
go httpsServer.ServeTLS(httpsLn, "", "")
|
|
defer httpsServer.Close()
|
|
|
|
//ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
|
//defer cancel()
|
|
|
|
a := dialParams{
|
|
ctx: context.Background(), //ctx,
|
|
host: "localhost",
|
|
httpPort: strconv.Itoa(httpLn.Addr().(*net.TCPAddr).Port),
|
|
httpsPort: strconv.Itoa(httpsLn.Addr().(*net.TCPAddr).Port),
|
|
machineKey: client,
|
|
controlKey: server.Public(),
|
|
insecureTLS: true,
|
|
}
|
|
|
|
if proxy != nil {
|
|
proxyEnv := proxy.Start(t)
|
|
defer proxy.Close()
|
|
proxyURL, err := url.Parse(proxyEnv)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
a.proxyFunc = func(*http.Request) (*url.URL, error) {
|
|
return proxyURL, nil
|
|
}
|
|
} else {
|
|
a.proxyFunc = func(*http.Request) (*url.URL, error) {
|
|
return nil, nil
|
|
}
|
|
}
|
|
|
|
conn, err := a.dial()
|
|
if err != nil {
|
|
t.Fatalf("dialing controlhttp: %v", err)
|
|
}
|
|
defer conn.Close()
|
|
si := <-sch
|
|
if si.conn != nil {
|
|
defer si.conn.Close()
|
|
}
|
|
if si.err != nil {
|
|
t.Fatalf("controlhttp server got error: %v", err)
|
|
}
|
|
if clientVersion := conn.ProtocolVersion(); si.version != clientVersion {
|
|
t.Fatalf("client and server don't agree on protocol version: %d vs %d", clientVersion, si.version)
|
|
}
|
|
if si.peer != client.Public() {
|
|
t.Fatalf("server got peer pubkey %s, want %s", si.peer, client.Public())
|
|
}
|
|
if spub := conn.Peer(); spub != server.Public() {
|
|
t.Fatalf("client got peer pubkey %s, want %s", spub, server.Public())
|
|
}
|
|
if proxy != nil && !proxy.ConnIsFromProxy(si.clientAddr) {
|
|
t.Fatalf("client connected from %s, which isn't the proxy", si.clientAddr)
|
|
}
|
|
}
|
|
|
|
type serverResult struct {
|
|
err error
|
|
clientAddr string
|
|
version int
|
|
peer key.MachinePublic
|
|
conn *controlbase.Conn
|
|
}
|
|
|
|
type proxy interface {
|
|
Start(*testing.T) string
|
|
Close()
|
|
ConnIsFromProxy(string) bool
|
|
}
|
|
|
|
type socksProxy struct {
|
|
sync.Mutex
|
|
proxy socks5.Server
|
|
ln net.Listener
|
|
clientConnAddrs map[string]bool // addrs of the local end of outgoing conns from proxy
|
|
}
|
|
|
|
func (s *socksProxy) Start(t *testing.T) (url string) {
|
|
t.Helper()
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
ln, err := net.Listen("tcp", "127.0.0.1:0")
|
|
if err != nil {
|
|
t.Fatalf("listening for SOCKS server: %v", err)
|
|
}
|
|
s.ln = ln
|
|
s.clientConnAddrs = map[string]bool{}
|
|
s.proxy.Logf = t.Logf
|
|
s.proxy.Dialer = s.dialAndRecord
|
|
go s.proxy.Serve(ln)
|
|
return fmt.Sprintf("socks5://%s", ln.Addr().String())
|
|
}
|
|
|
|
func (s *socksProxy) Close() {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
s.ln.Close()
|
|
}
|
|
|
|
func (s *socksProxy) dialAndRecord(ctx context.Context, network, addr string) (net.Conn, error) {
|
|
var d net.Dialer
|
|
conn, err := d.DialContext(ctx, network, addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
s.clientConnAddrs[conn.LocalAddr().String()] = true
|
|
return conn, nil
|
|
}
|
|
|
|
func (s *socksProxy) ConnIsFromProxy(addr string) bool {
|
|
s.Lock()
|
|
defer s.Unlock()
|
|
return s.clientConnAddrs[addr]
|
|
}
|
|
|
|
type httpProxy struct {
|
|
useTLS bool // take incoming connections over TLS
|
|
allowConnect bool // allow CONNECT for TLS
|
|
allowHTTP bool // allow plain HTTP proxying
|
|
|
|
sync.Mutex
|
|
ln net.Listener
|
|
rp httputil.ReverseProxy
|
|
s http.Server
|
|
clientConnAddrs map[string]bool // addrs of the local end of outgoing conns from proxy
|
|
}
|
|
|
|
func (h *httpProxy) Start(t *testing.T) (url string) {
|
|
t.Helper()
|
|
h.Lock()
|
|
defer h.Unlock()
|
|
ln, err := net.Listen("tcp", "127.0.0.1:0")
|
|
if err != nil {
|
|
t.Fatalf("listening for HTTP proxy: %v", err)
|
|
}
|
|
h.ln = ln
|
|
h.rp = httputil.ReverseProxy{
|
|
Director: func(*http.Request) {},
|
|
Transport: &http.Transport{
|
|
DialContext: h.dialAndRecord,
|
|
TLSClientConfig: &tls.Config{
|
|
InsecureSkipVerify: true,
|
|
},
|
|
TLSNextProto: map[string]func(string, *tls.Conn) http.RoundTripper{},
|
|
},
|
|
}
|
|
h.clientConnAddrs = map[string]bool{}
|
|
h.s.Handler = h
|
|
if h.useTLS {
|
|
h.s.TLSConfig = tlsConfig(t)
|
|
go h.s.ServeTLS(h.ln, "", "")
|
|
return fmt.Sprintf("https://%s", ln.Addr().String())
|
|
} else {
|
|
go h.s.Serve(h.ln)
|
|
return fmt.Sprintf("http://%s", ln.Addr().String())
|
|
}
|
|
}
|
|
|
|
func (h *httpProxy) Close() {
|
|
h.Lock()
|
|
defer h.Unlock()
|
|
h.s.Close()
|
|
}
|
|
|
|
func (h *httpProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
|
|
if r.Method != "CONNECT" {
|
|
if !h.allowHTTP {
|
|
http.Error(w, "http proxy not allowed", 500)
|
|
return
|
|
}
|
|
h.rp.ServeHTTP(w, r)
|
|
return
|
|
}
|
|
|
|
if !h.allowConnect {
|
|
http.Error(w, "connect not allowed", 500)
|
|
return
|
|
}
|
|
|
|
dst := r.RequestURI
|
|
c, err := h.dialAndRecord(context.Background(), "tcp", dst)
|
|
if err != nil {
|
|
http.Error(w, err.Error(), 500)
|
|
return
|
|
}
|
|
defer c.Close()
|
|
|
|
cc, ccbuf, err := w.(http.Hijacker).Hijack()
|
|
if err != nil {
|
|
http.Error(w, err.Error(), 500)
|
|
return
|
|
}
|
|
defer cc.Close()
|
|
|
|
io.WriteString(cc, "HTTP/1.1 200 OK\r\n\r\n")
|
|
|
|
errc := make(chan error, 1)
|
|
go func() {
|
|
_, err := io.Copy(cc, c)
|
|
errc <- err
|
|
}()
|
|
go func() {
|
|
_, err := io.Copy(c, ccbuf)
|
|
errc <- err
|
|
}()
|
|
<-errc
|
|
}
|
|
|
|
func (h *httpProxy) dialAndRecord(ctx context.Context, network, addr string) (net.Conn, error) {
|
|
var d net.Dialer
|
|
conn, err := d.DialContext(ctx, network, addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
h.Lock()
|
|
defer h.Unlock()
|
|
h.clientConnAddrs[conn.LocalAddr().String()] = true
|
|
return conn, nil
|
|
}
|
|
|
|
func (h *httpProxy) ConnIsFromProxy(addr string) bool {
|
|
h.Lock()
|
|
defer h.Unlock()
|
|
return h.clientConnAddrs[addr]
|
|
}
|
|
|
|
func tlsConfig(t *testing.T) *tls.Config {
|
|
// Cert and key taken from the example code in the crypto/tls
|
|
// package.
|
|
certPem := []byte(`-----BEGIN CERTIFICATE-----
|
|
MIIBhTCCASugAwIBAgIQIRi6zePL6mKjOipn+dNuaTAKBggqhkjOPQQDAjASMRAw
|
|
DgYDVQQKEwdBY21lIENvMB4XDTE3MTAyMDE5NDMwNloXDTE4MTAyMDE5NDMwNlow
|
|
EjEQMA4GA1UEChMHQWNtZSBDbzBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABD0d
|
|
7VNhbWvZLWPuj/RtHFjvtJBEwOkhbN/BnnE8rnZR8+sbwnc/KhCk3FhnpHZnQz7B
|
|
5aETbbIgmuvewdjvSBSjYzBhMA4GA1UdDwEB/wQEAwICpDATBgNVHSUEDDAKBggr
|
|
BgEFBQcDATAPBgNVHRMBAf8EBTADAQH/MCkGA1UdEQQiMCCCDmxvY2FsaG9zdDo1
|
|
NDUzgg4xMjcuMC4wLjE6NTQ1MzAKBggqhkjOPQQDAgNIADBFAiEA2zpJEPQyz6/l
|
|
Wf86aX6PepsntZv2GYlA5UpabfT2EZICICpJ5h/iI+i341gBmLiAFQOyTDT+/wQc
|
|
6MF9+Yw1Yy0t
|
|
-----END CERTIFICATE-----`)
|
|
keyPem := []byte(`-----BEGIN EC PRIVATE KEY-----
|
|
MHcCAQEEIIrYSSNQFaA2Hwf1duRSxKtLYX5CB04fSeQ6tF1aY/PuoAoGCCqGSM49
|
|
AwEHoUQDQgAEPR3tU2Fta9ktY+6P9G0cWO+0kETA6SFs38GecTyudlHz6xvCdz8q
|
|
EKTcWGekdmdDPsHloRNtsiCa697B2O9IFA==
|
|
-----END EC PRIVATE KEY-----`)
|
|
cert, err := tls.X509KeyPair(certPem, keyPem)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
return &tls.Config{
|
|
Certificates: []tls.Certificate{cert},
|
|
}
|
|
}
|