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tailscale/control/controlhttp/http_test.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-----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-----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},
}
}