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tailscale/control/controlhttp/http_test.go

752 lines
18 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package controlhttp
import (
"context"
"crypto/tls"
"fmt"
"io"
"log"
"net"
"net/http"
"net/http/httputil"
"net/netip"
"net/url"
"runtime"
"strconv"
"sync"
"testing"
"time"
"tailscale.com/control/controlbase"
"tailscale.com/net/dnscache"
"tailscale.com/net/socks5"
"tailscale.com/net/tsdial"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
"tailscale.com/types/logger"
)
type httpTestParam struct {
name string
proxy proxy
// makeHTTPHangAfterUpgrade makes the HTTP response hang after sending a
// 101 switching protocols.
makeHTTPHangAfterUpgrade bool
doEarlyWrite bool
}
func TestControlHTTP(t *testing.T) {
tests := []httpTestParam{
// direct connection
{
name: "no_proxy",
proxy: nil,
},
// direct connection but port 80 is MITM'ed and broken
{
name: "port80_broken_mitm",
proxy: nil,
makeHTTPHangAfterUpgrade: true,
},
// 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,
},
},
// Early write
{
name: "early_write",
doEarlyWrite: true,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
testControlHTTP(t, test)
})
}
}
func testControlHTTP(t *testing.T, param httpTestParam) {
proxy := param.proxy
client, server := key.NewMachine(), key.NewMachine()
const testProtocolVersion = 1
const earlyWriteMsg = "Hello, world!"
sch := make(chan serverResult, 1)
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var earlyWriteFn func(protocolVersion int, w io.Writer) error
if param.doEarlyWrite {
earlyWriteFn = func(protocolVersion int, w io.Writer) error {
if protocolVersion != testProtocolVersion {
t.Errorf("unexpected protocol version %d; want %d", protocolVersion, testProtocolVersion)
return fmt.Errorf("unexpected protocol version %d; want %d", protocolVersion, testProtocolVersion)
}
_, err := io.WriteString(w, earlyWriteMsg)
return err
}
}
conn, err := AcceptHTTP(context.Background(), w, r, server, earlyWriteFn)
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)
}
var httpHandler http.Handler = handler
if param.makeHTTPHangAfterUpgrade {
httpHandler = http.HandlerFunc(brokenMITMHandler)
}
httpServer := &http.Server{Handler: httpHandler}
go httpServer.Serve(httpLn)
defer httpServer.Close()
httpsServer := &http.Server{
Handler: handler,
TLSConfig: tlsConfig(t),
}
go httpsServer.ServeTLS(httpsLn, "", "")
defer httpsServer.Close()
ctx := context.Background()
const debugTimeout = false
if debugTimeout {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
}
a := &Dialer{
Hostname: "localhost",
HTTPPort: strconv.Itoa(httpLn.Addr().(*net.TCPAddr).Port),
HTTPSPort: strconv.Itoa(httpsLn.Addr().(*net.TCPAddr).Port),
MachineKey: client,
ControlKey: server.Public(),
ProtocolVersion: testProtocolVersion,
Dialer: new(tsdial.Dialer).SystemDial,
Logf: t.Logf,
insecureTLS: true,
testFallbackDelay: 50 * time.Millisecond,
}
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(ctx)
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)
}
if param.doEarlyWrite {
buf := make([]byte, len(earlyWriteMsg))
if _, err := io.ReadFull(conn, buf); err != nil {
t.Fatalf("reading early write: %v", err)
}
if string(buf) != earlyWriteMsg {
t.Errorf("early write = %q; want %q", buf, earlyWriteMsg)
}
}
}
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
closed bool
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 = func(format string, a ...any) {
s.Lock()
defer s.Unlock()
if s.closed {
return
}
t.Logf(format, a...)
}
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()
if s.closed {
return
}
s.closed = true
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},
}
}
func brokenMITMHandler(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Upgrade", upgradeHeaderValue)
w.Header().Set("Connection", "upgrade")
w.WriteHeader(http.StatusSwitchingProtocols)
w.(http.Flusher).Flush()
<-r.Context().Done()
}
func TestDialPlan(t *testing.T) {
if runtime.GOOS != "linux" {
t.Skip("only works on Linux due to multiple localhost addresses")
}
client, server := key.NewMachine(), key.NewMachine()
const (
testProtocolVersion = 1
)
getRandomPort := func() string {
ln, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatalf("net.Listen: %v", err)
}
defer ln.Close()
_, port, err := net.SplitHostPort(ln.Addr().String())
if err != nil {
t.Fatal(err)
}
return port
}
// We need consistent ports for each address; these are chosen
// randomly and we hope that they won't conflict during this test.
httpPort := getRandomPort()
httpsPort := getRandomPort()
makeHandler := func(t *testing.T, name string, host netip.Addr, wrap func(http.Handler) http.Handler) {
done := make(chan struct{})
t.Cleanup(func() {
close(done)
})
var handler http.Handler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
conn, err := AcceptHTTP(context.Background(), w, r, server, nil)
if err != nil {
log.Print(err)
} else {
defer conn.Close()
}
w.Header().Set("X-Handler-Name", name)
<-done
})
if wrap != nil {
handler = wrap(handler)
}
httpLn, err := net.Listen("tcp", host.String()+":"+httpPort)
if err != nil {
t.Fatalf("HTTP listen: %v", err)
}
httpsLn, err := net.Listen("tcp", host.String()+":"+httpsPort)
if err != nil {
t.Fatalf("HTTPS listen: %v", err)
}
httpServer := &http.Server{Handler: handler}
go httpServer.Serve(httpLn)
t.Cleanup(func() {
httpServer.Close()
})
httpsServer := &http.Server{
Handler: handler,
TLSConfig: tlsConfig(t),
ErrorLog: logger.StdLogger(logger.WithPrefix(t.Logf, "http.Server.ErrorLog: ")),
}
go httpsServer.ServeTLS(httpsLn, "", "")
t.Cleanup(func() {
httpsServer.Close()
})
return
}
fallbackAddr := netip.MustParseAddr("127.0.0.1")
goodAddr := netip.MustParseAddr("127.0.0.2")
otherAddr := netip.MustParseAddr("127.0.0.3")
other2Addr := netip.MustParseAddr("127.0.0.4")
brokenAddr := netip.MustParseAddr("127.0.0.10")
testCases := []struct {
name string
plan *tailcfg.ControlDialPlan
wrap func(http.Handler) http.Handler
want netip.Addr
allowFallback bool
}{
{
name: "single",
plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
{IP: goodAddr, Priority: 1, DialTimeoutSec: 10},
}},
want: goodAddr,
},
{
name: "broken-then-good",
plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
// Dials the broken one, which fails, and then
// eventually dials the good one and succeeds
{IP: brokenAddr, Priority: 2, DialTimeoutSec: 10},
{IP: goodAddr, Priority: 1, DialTimeoutSec: 10, DialStartDelaySec: 1},
}},
want: goodAddr,
},
{
name: "multiple-priority-fast-path",
plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
// Dials some good IPs and our bad one (which
// hangs forever), which then hits the fast
// path where we bail without waiting.
{IP: brokenAddr, Priority: 1, DialTimeoutSec: 10},
{IP: goodAddr, Priority: 1, DialTimeoutSec: 10},
{IP: other2Addr, Priority: 1, DialTimeoutSec: 10},
{IP: otherAddr, Priority: 2, DialTimeoutSec: 10},
}},
want: otherAddr,
},
{
name: "multiple-priority-slow-path",
plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
// Our broken address is the highest priority,
// so we don't hit our fast path.
{IP: brokenAddr, Priority: 10, DialTimeoutSec: 10},
{IP: otherAddr, Priority: 2, DialTimeoutSec: 10},
{IP: goodAddr, Priority: 1, DialTimeoutSec: 10},
}},
want: otherAddr,
},
{
name: "fallback",
plan: &tailcfg.ControlDialPlan{Candidates: []tailcfg.ControlIPCandidate{
{IP: brokenAddr, Priority: 1, DialTimeoutSec: 1},
}},
want: fallbackAddr,
allowFallback: true,
},
}
for _, tt := range testCases {
t.Run(tt.name, func(t *testing.T) {
makeHandler(t, "fallback", fallbackAddr, nil)
makeHandler(t, "good", goodAddr, nil)
makeHandler(t, "other", otherAddr, nil)
makeHandler(t, "other2", other2Addr, nil)
makeHandler(t, "broken", brokenAddr, func(h http.Handler) http.Handler {
return http.HandlerFunc(brokenMITMHandler)
})
dialer := closeTrackDialer{
t: t,
inner: new(tsdial.Dialer).SystemDial,
conns: make(map[*closeTrackConn]bool),
}
defer dialer.Done()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// By default, we intentionally point to something that
// we know won't connect, since we want a fallback to
// DNS to be an error.
host := "example.com"
if tt.allowFallback {
host = "localhost"
}
drained := make(chan struct{})
a := &Dialer{
Hostname: host,
HTTPPort: httpPort,
HTTPSPort: httpsPort,
MachineKey: client,
ControlKey: server.Public(),
ProtocolVersion: testProtocolVersion,
Dialer: dialer.Dial,
Logf: t.Logf,
DialPlan: tt.plan,
proxyFunc: func(*http.Request) (*url.URL, error) { return nil, nil },
drainFinished: drained,
insecureTLS: true,
testFallbackDelay: 50 * time.Millisecond,
}
conn, err := a.dial(ctx)
if err != nil {
t.Fatalf("dialing controlhttp: %v", err)
}
defer conn.Close()
raddr := conn.RemoteAddr().(*net.TCPAddr)
got, ok := netip.AddrFromSlice(raddr.IP)
if !ok {
t.Errorf("invalid remote IP: %v", raddr.IP)
} else if got != tt.want {
t.Errorf("got connection from %q; want %q", got, tt.want)
} else {
t.Logf("successfully connected to %q", raddr.String())
}
// Wait until our dialer drains so we can verify that
// all connections are closed.
<-drained
})
}
}
type closeTrackDialer struct {
t testing.TB
inner dnscache.DialContextFunc
mu sync.Mutex
conns map[*closeTrackConn]bool
}
func (d *closeTrackDialer) Dial(ctx context.Context, network, addr string) (net.Conn, error) {
c, err := d.inner(ctx, network, addr)
if err != nil {
return nil, err
}
ct := &closeTrackConn{Conn: c, d: d}
d.mu.Lock()
d.conns[ct] = true
d.mu.Unlock()
return ct, nil
}
func (d *closeTrackDialer) Done() {
// Unfortunately, tsdial.Dialer.SystemDial closes connections
// asynchronously in a goroutine, so we can't assume that everything is
// closed by the time we get here.
//
// Sleep/wait a few times on the assumption that things will close
// "eventually".
const iters = 100
for i := 0; i < iters; i++ {
d.mu.Lock()
if len(d.conns) == 0 {
d.mu.Unlock()
return
}
// Only error on last iteration
if i != iters-1 {
d.mu.Unlock()
time.Sleep(100 * time.Millisecond)
continue
}
for conn := range d.conns {
d.t.Errorf("expected close of conn %p; RemoteAddr=%q", conn, conn.RemoteAddr().String())
}
d.mu.Unlock()
}
}
func (d *closeTrackDialer) noteClose(c *closeTrackConn) {
d.mu.Lock()
delete(d.conns, c) // safe if already deleted
d.mu.Unlock()
}
type closeTrackConn struct {
net.Conn
d *closeTrackDialer
}
func (c *closeTrackConn) Close() error {
c.d.noteClose(c)
return c.Conn.Close()
}