628 lines
18 KiB
Go
628 lines
18 KiB
Go
package mtprotoedge
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import (
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"context"
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"crypto/rand"
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"crypto/rsa"
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"encoding/binary"
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"errors"
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"net"
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"testing"
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"time"
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"go.uber.org/zap/zaptest"
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"github.com/gotd/log/logzap"
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"github.com/gotd/td/bin"
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"github.com/gotd/td/exchange"
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"github.com/gotd/td/mt"
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tgproto "github.com/gotd/td/proto"
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"github.com/gotd/td/proto/codec"
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"github.com/gotd/td/transport"
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"telesrv/internal/store"
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"telesrv/internal/store/memory"
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)
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// TestKeyExchange 验证 M1：client 用 server 公钥完成 MTProto 密钥交换，
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// 双方得到一致的 auth key 与 server salt，且 server 将其存入 AuthKeyStore。
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func TestKeyExchange(t *testing.T) {
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const dc = 2
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rsaKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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t.Fatalf("gen rsa: %v", err)
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}
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("listen: %v", err)
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}
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keys := memory.NewAuthKeyStore()
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srv := New(Options{
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Logger: zaptest.NewLogger(t),
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DC: dc,
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RSAKey: rsaKey,
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AuthKeys: keys,
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})
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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serveErr := make(chan error, 1)
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go func() { serveErr <- srv.Serve(ctx, ln) }()
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// client：TCP 拨号 + intermediate 握手，跑 client 端密钥交换。
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raw, err := net.Dial("tcp", ln.Addr().String())
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if err != nil {
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t.Fatalf("dial: %v", err)
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}
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conn, err := transport.Intermediate.Handshake(raw)
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if err != nil {
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t.Fatalf("transport handshake: %v", err)
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}
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pub := exchange.PublicKey{RSA: &rsaKey.PublicKey}
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exchCtx, ec := context.WithTimeout(context.Background(), 10*time.Second)
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defer ec()
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res, err := exchange.NewExchanger(conn, dc).
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WithRand(rand.Reader).
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WithLogger(logzap.New(zaptest.NewLogger(t).Named("client"))).
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Client([]exchange.PublicKey{pub}).
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Run(exchCtx)
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if err != nil {
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t.Fatalf("client exchange: %v", err)
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}
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// server 在 Run 返回后落库，轮询等待。
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var saved store.AuthKeyData
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found := false
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deadline := time.Now().Add(5 * time.Second)
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for time.Now().Before(deadline) {
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saved, found, _ = keys.Get(context.Background(), res.AuthKey.ID)
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if found {
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break
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}
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time.Sleep(20 * time.Millisecond)
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}
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if !found {
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t.Fatalf("server did not store auth key %x", res.AuthKey.ID)
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}
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if saved.Value != [256]byte(res.AuthKey.Value) {
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t.Fatal("server auth key value mismatch")
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}
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if saved.ServerSalt != res.ServerSalt {
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t.Fatalf("server salt mismatch: server=%d client=%d", saved.ServerSalt, res.ServerSalt)
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}
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cancel()
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select {
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case err := <-serveErr:
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if err != nil {
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t.Fatalf("serve: %v", err)
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}
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case <-time.After(5 * time.Second):
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t.Fatal("server did not stop after ctx cancel")
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}
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}
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type authKeySaveContextObservation struct {
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hasDeadline bool
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deadline time.Time
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}
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type observingAuthKeyStore struct {
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store.AuthKeyStore
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saveContext chan authKeySaveContextObservation
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}
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func (s *observingAuthKeyStore) Save(ctx context.Context, key store.AuthKeyData) error {
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deadline, hasDeadline := ctx.Deadline()
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select {
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case s.saveContext <- authKeySaveContextObservation{hasDeadline: hasDeadline, deadline: deadline}:
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default:
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}
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return s.AuthKeyStore.Save(ctx, key)
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}
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type gatedAuthKeyStore struct {
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store.AuthKeyStore
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entered chan store.AuthKeyData
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release chan struct{}
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saveErr error
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}
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type ownershipFrameConn struct {
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transport.Conn
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frame []byte
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}
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func (c *ownershipFrameConn) Recv(_ context.Context, b *bin.Buffer) error {
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b.ResetTo(c.frame)
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return nil
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}
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func TestExchangeEncryptedReplayTransfersFrameOwnership(t *testing.T) {
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backing := make([]byte, 64)
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copy(backing[:8], []byte{1, 2, 3, 4, 5, 6, 7, 8})
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conn := &ownershipFrameConn{frame: backing}
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ex := serverExchangeCompat{conn: conn, timeout: time.Second}
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var b bin.Buffer
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err := ex.readUnencrypted(context.Background(), &b, &compatReqPQ{})
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var encrypted *exchange.UnexpectedEncryptedError
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if !errors.As(err, &encrypted) {
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t.Fatalf("read encrypted frame err = %v, want UnexpectedEncryptedError", err)
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}
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if len(encrypted.Frame) != len(backing) || &encrypted.Frame[0] != &backing[0] {
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t.Fatal("encrypted replay copied the received frame instead of transferring ownership")
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}
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if b.Buf != nil {
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t.Fatal("exchange buffer retained transferred encrypted frame backing")
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}
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}
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func (s *gatedAuthKeyStore) Save(ctx context.Context, key store.AuthKeyData) error {
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select {
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case s.entered <- key:
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case <-ctx.Done():
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return ctx.Err()
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}
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select {
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case <-s.release:
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case <-ctx.Done():
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return ctx.Err()
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}
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if s.saveErr != nil {
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return s.saveErr
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}
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return s.AuthKeyStore.Save(ctx, key)
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}
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// TestKeyExchangeDoesNotAcknowledgeBeforeAuthKeyCommit pins the protocol commit
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// boundary: while durable Save is blocked, the client must not receive DhGenOk
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// and therefore must not report a successful exchange.
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func TestKeyExchangeDoesNotAcknowledgeBeforeAuthKeyCommit(t *testing.T) {
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base := memory.NewAuthKeyStore()
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keys := &gatedAuthKeyStore{
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AuthKeyStore: base,
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entered: make(chan store.AuthKeyData, 1),
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release: make(chan struct{}, 1),
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}
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addr, pub, _ := startTestServer(t, Options{DC: 2, AuthKeys: keys})
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conn := dialTransportOnly(t, addr)
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type exchangeOutcome struct {
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result exchange.ClientExchangeResult
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err error
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}
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outcome := make(chan exchangeOutcome, 1)
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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go func() {
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result, err := exchange.NewExchanger(conn, 2).
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WithRand(rand.Reader).
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Client([]exchange.PublicKey{pub}).
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Run(ctx)
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outcome <- exchangeOutcome{result: result, err: err}
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}()
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var pending store.AuthKeyData
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select {
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case pending = <-keys.entered:
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case <-time.After(5 * time.Second):
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t.Fatal("AuthKeyStore.Save was not reached")
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}
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defer func() {
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select {
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case keys.release <- struct{}{}:
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default:
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}
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}()
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select {
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case got := <-outcome:
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t.Fatalf("client exchange completed before auth key commit: err=%v", got.err)
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case <-time.After(150 * time.Millisecond):
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}
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if _, found, err := base.Get(context.Background(), pending.ID); err != nil {
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t.Fatalf("Get before commit: %v", err)
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} else if found {
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t.Fatal("auth key became visible while durable Save was blocked")
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}
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keys.release <- struct{}{}
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select {
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case got := <-outcome:
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if got.err != nil {
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t.Fatalf("client exchange after commit: %v", got.err)
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}
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if got.result.AuthKey.ID != pending.ID {
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t.Fatalf("committed auth key id = %x, client got %x", pending.ID, got.result.AuthKey.ID)
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}
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case <-time.After(5 * time.Second):
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t.Fatal("client exchange did not finish after auth key commit")
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}
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if _, found, err := base.Get(context.Background(), pending.ID); err != nil {
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t.Fatalf("Get after commit: %v", err)
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} else if !found {
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t.Fatal("auth key is not durable after successful client exchange")
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}
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}
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// TestKeyExchangeAuthKeyCommitFailureWithholdsDhGenOk proves the failure side
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// of the same invariant. The client must not observe success if storage rejects
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// the key; the server closes this exchange and lets the client retry cleanly.
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func TestKeyExchangeAuthKeyCommitFailureWithholdsDhGenOk(t *testing.T) {
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base := memory.NewAuthKeyStore()
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keys := &gatedAuthKeyStore{
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AuthKeyStore: base,
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entered: make(chan store.AuthKeyData, 1),
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release: make(chan struct{}, 1),
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saveErr: errors.New("injected auth key persistence failure"),
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}
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keys.release <- struct{}{}
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addr, pub, _ := startTestServer(t, Options{DC: 2, AuthKeys: keys})
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conn := dialTransportOnly(t, addr)
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ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
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defer cancel()
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_, err := exchange.NewExchanger(conn, 2).
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WithRand(rand.Reader).
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Client([]exchange.PublicKey{pub}).
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Run(ctx)
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if err == nil {
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t.Fatal("client exchange succeeded even though auth key commit failed")
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}
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select {
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case attempted := <-keys.entered:
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if _, found, getErr := base.Get(context.Background(), attempted.ID); getErr != nil {
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t.Fatalf("Get failed key: %v", getErr)
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} else if found {
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t.Fatal("failed auth key commit became visible")
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}
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case <-time.After(time.Second):
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t.Fatal("AuthKeyStore.Save was not attempted")
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}
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}
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func TestKeyExchangeAuthKeySaveUsesHandshakeDeadline(t *testing.T) {
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const handshakeMax = 10 * time.Second
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observed := make(chan authKeySaveContextObservation, 1)
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keys := &observingAuthKeyStore{
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AuthKeyStore: memory.NewAuthKeyStore(),
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saveContext: observed,
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}
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addr, pub, _ := startTestServer(t, Options{
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DC: 2,
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AuthKeys: keys,
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HandshakeMaxDuration: handshakeMax,
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})
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_, _, _ = dialHandshake(t, addr, 2, pub)
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select {
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case got := <-observed:
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if !got.hasDeadline {
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t.Fatal("AuthKeyStore.Save context has no handshake deadline")
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}
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remaining := time.Until(got.deadline)
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if remaining <= 0 || remaining > handshakeMax {
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t.Fatalf("AuthKeyStore.Save deadline remaining = %v, want (0, %v]", remaining, handshakeMax)
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}
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case <-time.After(time.Second):
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t.Fatal("AuthKeyStore.Save was not called")
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}
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}
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func TestKeyExchangeAcceptsAndroidMediaTempNegativeDC(t *testing.T) {
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const dc = 2
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addr, pub, srv := startTestServer(t, Options{DC: dc})
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conn := dialTransportOnly(t, addr)
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t.Cleanup(func() { _ = conn.Close() })
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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res, err := exchange.NewExchanger(conn, -dc).
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WithTempMode(24 * 60 * 60).
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WithRand(rand.Reader).
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WithLogger(logzap.New(zaptest.NewLogger(t).Named("client"))).
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Client([]exchange.PublicKey{pub}).
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Run(ctx)
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if err != nil {
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t.Fatalf("client exchange: %v", err)
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}
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var saved store.AuthKeyData
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found := false
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deadline := time.Now().Add(5 * time.Second)
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for time.Now().Before(deadline) {
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saved, found, _ = srv.authKeys.Get(context.Background(), res.AuthKey.ID)
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if found {
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break
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}
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time.Sleep(20 * time.Millisecond)
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}
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if !found {
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t.Fatalf("server did not store media temp auth key %x", res.AuthKey.ID)
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}
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if saved.Value != [256]byte(res.AuthKey.Value) {
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t.Fatal("server auth key value mismatch")
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}
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if saved.ServerSalt != res.ServerSalt {
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t.Fatalf("server salt mismatch: server=%d client=%d", saved.ServerSalt, res.ServerSalt)
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}
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}
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func TestKeyExchangeRejectsWrongNegativeTempDC(t *testing.T) {
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ex := serverExchangeCompat{dc: 2, log: zaptest.NewLogger(t)}
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err := ex.validatePQInnerDataDC(&mt.PQInnerDataTempDC{DC: -3})
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var exErr *exchange.ServerExchangeError
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if !errors.As(err, &exErr) {
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t.Fatalf("err = %T %v, want ServerExchangeError", err, err)
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}
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if exErr.Code != codec.CodeWrongDC {
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t.Fatalf("error code = %d, want %d", exErr.Code, codec.CodeWrongDC)
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}
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}
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func TestKeyExchangeIgnoresUnencryptedMsgsAck(t *testing.T) {
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const dc = 2
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rsaKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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t.Fatalf("gen rsa: %v", err)
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}
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ln, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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t.Fatalf("listen: %v", err)
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}
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keys := memory.NewAuthKeyStore()
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srv := New(Options{
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Logger: zaptest.NewLogger(t),
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DC: dc,
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RSAKey: rsaKey,
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AuthKeys: keys,
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})
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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serveErr := make(chan error, 1)
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go func() { serveErr <- srv.Serve(ctx, ln) }()
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raw, err := net.Dial("tcp", ln.Addr().String())
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if err != nil {
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t.Fatalf("dial: %v", err)
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}
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conn, err := transport.Intermediate.Handshake(raw)
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if err != nil {
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t.Fatalf("transport handshake: %v", err)
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}
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pub := exchange.PublicKey{RSA: &rsaKey.PublicKey}
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exchCtx, ec := context.WithTimeout(context.Background(), 10*time.Second)
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defer ec()
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res, err := exchange.NewExchanger(&ackingExchangeConn{Conn: conn, t: t}, dc).
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WithRand(rand.Reader).
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WithLogger(logzap.New(zaptest.NewLogger(t).Named("client"))).
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Client([]exchange.PublicKey{pub}).
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Run(exchCtx)
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if err != nil {
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t.Fatalf("client exchange: %v", err)
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}
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deadline := time.Now().Add(5 * time.Second)
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for {
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if _, found, _ := keys.Get(context.Background(), res.AuthKey.ID); found {
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break
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}
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if time.Now().After(deadline) {
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t.Fatalf("server did not store auth key %x", res.AuthKey.ID)
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}
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time.Sleep(20 * time.Millisecond)
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}
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cancel()
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select {
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case err := <-serveErr:
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if err != nil {
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t.Fatalf("serve: %v", err)
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}
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case <-time.After(5 * time.Second):
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t.Fatal("server did not stop after ctx cancel")
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}
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}
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func TestBufferedExchangePushTransfersFrameOwnershipWithoutCopy(t *testing.T) {
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backing := make([]byte, 64)
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for i := range backing {
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backing[i] = byte(i)
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}
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source := &bin.Buffer{Buf: backing}
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buffered := newBufferedConn(nil)
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buffered.push(source)
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if source.Buf != nil {
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t.Fatal("push retained ownership in the source buffer")
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}
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var got bin.Buffer
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if err := buffered.Recv(context.Background(), &got); err != nil {
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t.Fatalf("Recv pending frame: %v", err)
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}
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if len(got.Buf) != len(backing) || &got.Buf[0] != &backing[0] {
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t.Fatal("pending frame was copied instead of transferring its backing")
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}
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if len(buffered.pending) != 0 || cap(buffered.pending) != 0 {
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t.Fatalf("consumed pending ownership retained: len=%d cap=%d", len(buffered.pending), cap(buffered.pending))
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}
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}
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func TestBufferedExchangeLargeTrailingMsgsAckReleasesFrameBeforeNextRecv(t *testing.T) {
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encodeUnencrypted := func(msg bin.Encoder, msgID int64) []byte {
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var payload bin.Buffer
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if err := msg.Encode(&payload); err != nil {
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t.Fatalf("encode payload: %v", err)
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}
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var frame bin.Buffer
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if err := (tgproto.UnencryptedMessage{MessageID: msgID, MessageData: payload.Raw()}).Encode(&frame); err != nil {
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t.Fatalf("encode unencrypted frame: %v", err)
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}
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return frame.Copy()
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}
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intermediate := func(frame []byte) []byte {
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packet := make([]byte, bin.Word+len(frame))
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binary.LittleEndian.PutUint32(packet, uint32(len(frame)))
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copy(packet[bin.Word:], frame)
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return packet
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}
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// Make the ignored ack larger than the per-codec retained-buffer threshold. The following
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// small req_pq frame forces bufferedConn to cross the next-Recv ownership boundary while the
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// same destination bin.Buffer is reused.
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ids := make([]int64, 300_000)
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for i := range ids {
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ids[i] = int64(i + 1)
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}
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ackFrame := encodeUnencrypted(&mt.MsgsAck{MsgIDs: ids}, 4)
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reqFrame := encodeUnencrypted(&mt.ReqPqMultiRequest{}, 8)
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packet := append(intermediate(ackFrame), intermediate(reqFrame)...)
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budget := newInboundFrameBudget(2 * int64(len(ackFrame)))
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conn, _ := newFrameBudgetTestTransport(packet, &quickAckIntermediateCodec{}, budget)
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buffered := newBufferedConn(conn)
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var got bin.Buffer
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if err := buffered.Recv(context.Background(), &got); err != nil {
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t.Fatalf("Recv after large msgs_ack: %v", err)
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}
|
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if id, ok := unencryptedPayloadID(&got); !ok || id != mt.ReqPqMultiRequestTypeID {
|
||
t.Fatalf("returned frame type = 0x%x ok=%v, want req_pq_multi", id, ok)
|
||
}
|
||
if used, want := budget.usedBytes(), 2*int64(len(reqFrame)); used != want {
|
||
t.Fatalf("inbound budget after skipped ack = %d, want only next frame %d", used, want)
|
||
}
|
||
if cap(got.Buf) >= len(ackFrame)/2 {
|
||
t.Fatalf("large ignored ack backing retained by next frame: cap=%d ack=%d", cap(got.Buf), len(ackFrame))
|
||
}
|
||
conn.releaseInboundFrame()
|
||
if used := budget.usedBytes(); used != 0 {
|
||
t.Fatalf("inbound budget after final ownership release = %d, want 0", used)
|
||
}
|
||
}
|
||
|
||
type ackingExchangeConn struct {
|
||
transport.Conn
|
||
t *testing.T
|
||
}
|
||
|
||
func (c *ackingExchangeConn) Recv(ctx context.Context, b *bin.Buffer) error {
|
||
if err := c.Conn.Recv(ctx, b); err != nil {
|
||
return err
|
||
}
|
||
c.ackHandshakeMessage(b)
|
||
return nil
|
||
}
|
||
|
||
func (c *ackingExchangeConn) ackHandshakeMessage(frame *bin.Buffer) {
|
||
var msg tgproto.UnencryptedMessage
|
||
copy := &bin.Buffer{Buf: frame.Copy()}
|
||
if err := msg.Decode(copy); err != nil {
|
||
return
|
||
}
|
||
payload := &bin.Buffer{Buf: msg.MessageData}
|
||
id, err := payload.PeekID()
|
||
if err != nil {
|
||
return
|
||
}
|
||
switch id {
|
||
case mt.ResPQTypeID, mt.ServerDHParamsOkTypeID:
|
||
default:
|
||
return
|
||
}
|
||
|
||
var ackPayload bin.Buffer
|
||
if err := (&mt.MsgsAck{MsgIDs: []int64{msg.MessageID}}).Encode(&ackPayload); err != nil {
|
||
c.t.Fatalf("encode msgs_ack: %v", err)
|
||
}
|
||
var ackFrame bin.Buffer
|
||
if err := (tgproto.UnencryptedMessage{
|
||
MessageID: int64(tgproto.NewMessageID(time.Now(), tgproto.MessageFromClient)),
|
||
MessageData: ackPayload.Raw(),
|
||
}).Encode(&ackFrame); err != nil {
|
||
c.t.Fatalf("encode msgs_ack frame: %v", err)
|
||
}
|
||
sendCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
||
defer cancel()
|
||
if err := c.Conn.Send(sendCtx, &ackFrame); err != nil {
|
||
c.t.Fatalf("send msgs_ack: %v", err)
|
||
}
|
||
}
|
||
|
||
func TestReconnectFakeReqPQThenEncryptedFrame(t *testing.T) {
|
||
const dc = 2
|
||
addr, pub, _ := startTestServer(t, Options{DC: dc})
|
||
|
||
firstConn, auth, cipher := dialHandshake(t, addr, dc, pub)
|
||
_ = firstConn.Close()
|
||
|
||
raw, err := net.Dial("tcp", addr)
|
||
if err != nil {
|
||
t.Fatalf("dial reconnect: %v", err)
|
||
}
|
||
conn, err := transport.Intermediate.Handshake(raw)
|
||
if err != nil {
|
||
t.Fatalf("transport reconnect: %v", err)
|
||
}
|
||
t.Cleanup(func() { _ = conn.Close() })
|
||
|
||
var reqPayload bin.Buffer
|
||
nonce, err := randInt128ForTest()
|
||
if err != nil {
|
||
t.Fatalf("nonce: %v", err)
|
||
}
|
||
if err := (&mt.ReqPqMultiRequest{Nonce: nonce}).Encode(&reqPayload); err != nil {
|
||
t.Fatalf("encode req_pq_multi: %v", err)
|
||
}
|
||
var fakeReq bin.Buffer
|
||
if err := (tgproto.UnencryptedMessage{
|
||
MessageID: int64(tgproto.NewMessageID(time.Now(), tgproto.MessageFromClient)),
|
||
MessageData: reqPayload.Raw(),
|
||
}).Encode(&fakeReq); err != nil {
|
||
t.Fatalf("encode fake req_pq: %v", err)
|
||
}
|
||
|
||
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
|
||
if err := conn.Send(ctx, &fakeReq); err != nil {
|
||
cancel()
|
||
t.Fatalf("send fake req_pq: %v", err)
|
||
}
|
||
cancel()
|
||
|
||
msgGen := tgproto.NewMessageIDGen(time.Now)
|
||
sendEncrypted(t, conn, cipher, auth, msgGen.New(tgproto.MessageFromClient), &mt.PingRequest{PingID: 7})
|
||
|
||
var resPQFrame bin.Buffer
|
||
ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
|
||
err = conn.Recv(ctx, &resPQFrame)
|
||
cancel()
|
||
if err != nil {
|
||
t.Fatalf("recv resPQ: %v", err)
|
||
}
|
||
var plain tgproto.UnencryptedMessage
|
||
if err := plain.Decode(&resPQFrame); err != nil {
|
||
t.Fatalf("decode resPQ frame: %v", err)
|
||
}
|
||
if id, err := (&bin.Buffer{Buf: plain.MessageData}).PeekID(); err != nil || id != mt.ResPQTypeID {
|
||
t.Fatalf("resPQ payload id = %#x err=%v, want %#x", id, err, mt.ResPQTypeID)
|
||
}
|
||
|
||
got := collectReplies(t, conn, cipher, auth.AuthKey, mt.PongTypeID)
|
||
mustHave(t, got, mt.PongTypeID, "pong after fake req_pq reconnect")
|
||
}
|
||
|
||
func randInt128ForTest() (v bin.Int128, err error) {
|
||
_, err = rand.Read(v[:])
|
||
return v, err
|
||
}
|