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762 lines (703 loc) · 21.9 KB
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE-Go file.
// Server side implementation of REALITY protocol, a fork of package tls in Go 1.19.5.
// For client side, please follow https://github.com/XTLS/Xray-core.
package reality
// BUG(agl): The crypto/tls package only implements some countermeasures
// against Lucky13 attacks on CBC-mode encryption, and only on SHA1
// variants. See http://www.isg.rhul.ac.uk/tls/TLStiming.pdf and
// https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
import (
"bytes"
"context"
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/binary"
"encoding/pem"
"errors"
"fmt"
"io"
"net"
"os"
"runtime"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/pires/go-proxyproto"
"golang.org/x/crypto/curve25519"
"golang.org/x/crypto/hkdf"
)
type ReaderConn struct {
Conn net.Conn
Reader *bytes.Reader
Written int
Closed bool
}
func (c *ReaderConn) Read(b []byte) (int, error) {
if c.Closed {
return 0, errors.New("Closed")
}
n, err := c.Reader.Read(b)
if err == io.EOF {
return n, errors.New("io.EOF") // prevent looping
}
return n, err
}
func (c *ReaderConn) Write(b []byte) (int, error) {
if c.Closed {
return 0, errors.New("Closed")
}
c.Written += len(b)
return len(b), nil
}
func (c *ReaderConn) Close() error {
c.Closed = true
return nil
}
func (c *ReaderConn) LocalAddr() net.Addr {
return c.Conn.LocalAddr()
}
func (c *ReaderConn) RemoteAddr() net.Addr {
return c.Conn.RemoteAddr()
}
func (c *ReaderConn) SetDeadline(t time.Time) error {
return nil
}
func (c *ReaderConn) SetReadDeadline(t time.Time) error {
return nil
}
func (c *ReaderConn) SetWriteDeadline(t time.Time) error {
return nil
}
var (
size = 8192
empty = make([]byte, size)
types = [7]string{
"Server Hello",
"Change Cipher Spec",
"Encrypted Extensions",
"Certificate",
"Certificate Verify",
"Finished",
"New Session Ticket",
}
)
func Value(vals ...byte) (value int) {
for i, val := range vals {
value |= int(val) << ((len(vals) - i - 1) * 8)
}
return
}
// Server returns a new TLS server side connection
// using conn as the underlying transport.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Server(ctx context.Context, conn net.Conn, config *Config) (*Conn, error) {
remoteAddr := conn.RemoteAddr().String()
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\n", remoteAddr)
}
target, err := config.DialContext(ctx, config.Type, config.Dest)
if err != nil {
conn.Close()
return nil, errors.New("REALITY: failed to dial dest: " + err.Error())
}
if config.Xver == 1 || config.Xver == 2 {
if _, err = proxyproto.HeaderProxyFromAddrs(config.Xver, conn.RemoteAddr(), conn.LocalAddr()).WriteTo(target); err != nil {
target.Close()
conn.Close()
return nil, errors.New("REALITY: failed to send PROXY protocol: " + err.Error())
}
}
underlying := conn
if pc, ok := underlying.(*proxyproto.Conn); ok {
underlying = pc.Raw()
}
hs := serverHandshakeStateTLS13{ctx: context.Background()}
c2sSaved := make([]byte, 0, size)
s2cSaved := make([]byte, 0, size)
copying := false
handled := false
waitGroup := new(sync.WaitGroup)
waitGroup.Add(2)
mutex := new(sync.Mutex)
go func() {
done := false
buf := make([]byte, size)
clientHelloLen := 0
for {
runtime.Gosched()
n, err := conn.Read(buf)
if n == 0 {
if err != nil {
target.Close()
waitGroup.Done()
return
}
continue
}
mutex.Lock()
c2sSaved = append(c2sSaved, buf[:n]...)
if _, err = target.Write(buf[:n]); err != nil {
done = true
break
}
if copying || len(c2sSaved) > size || len(s2cSaved) > 0 { // follow; too long; unexpected
break
}
if clientHelloLen == 0 && len(c2sSaved) > recordHeaderLen {
if recordType(c2sSaved[0]) != recordTypeHandshake || Value(c2sSaved[1:3]...) != VersionTLS10 || c2sSaved[5] != typeClientHello {
break
}
clientHelloLen = recordHeaderLen + Value(c2sSaved[3:5]...)
}
if clientHelloLen > size { // too long
break
}
if clientHelloLen == 0 || len(c2sSaved) < clientHelloLen {
mutex.Unlock()
continue
}
if len(c2sSaved) > clientHelloLen { // unexpected
break
}
readerConn := &ReaderConn{
Conn: conn,
Reader: bytes.NewReader(c2sSaved),
}
hs.c = &Conn{
conn: readerConn,
config: config,
}
hs.clientHello, err = hs.c.readClientHello(context.Background())
if err != nil || readerConn.Reader.Len() > 0 || readerConn.Written > 0 || readerConn.Closed {
break
}
if hs.c.vers != VersionTLS13 || !config.ServerNames[hs.clientHello.serverName] {
break
}
for i, keyShare := range hs.clientHello.keyShares {
if keyShare.group != X25519 || len(keyShare.data) != 32 {
continue
}
if hs.c.AuthKey, err = curve25519.X25519(config.PrivateKey, keyShare.data); err != nil {
break
}
if _, err = hkdf.New(sha256.New, hs.c.AuthKey, hs.clientHello.random[:20], []byte("REALITY")).Read(hs.c.AuthKey); err != nil {
break
}
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ths.clientHello.sessionId: %v\n", remoteAddr, hs.clientHello.sessionId)
fmt.Printf("REALITY remoteAddr: %v\ths.c.AuthKey: %v\n", remoteAddr, hs.c.AuthKey)
}
block, _ := aes.NewCipher(hs.c.AuthKey)
aead, _ := cipher.NewGCM(block)
ciphertext := make([]byte, 32)
plainText := make([]byte, 32)
copy(ciphertext, hs.clientHello.sessionId)
copy(hs.clientHello.sessionId, plainText) // hs.clientHello.sessionId points to hs.clientHello.raw[39:]
if _, err = aead.Open(plainText[:0], hs.clientHello.random[20:], ciphertext, hs.clientHello.raw); err != nil {
break
}
copy(hs.clientHello.sessionId, ciphertext)
copy(hs.c.ClientVer[:], plainText)
copy(hs.c.ClientShortId[:], plainText[8:])
plainText[0] = 0
plainText[1] = 0
plainText[2] = 0
hs.c.ClientTime = time.Unix(int64(binary.BigEndian.Uint64(plainText)), 0)
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ths.c.ClientVer: %v\n", remoteAddr, hs.c.ClientVer)
fmt.Printf("REALITY remoteAddr: %v\ths.c.ClientTime: %v\n", remoteAddr, hs.c.ClientTime)
fmt.Printf("REALITY remoteAddr: %v\ths.c.ClientShortId: %v\n", remoteAddr, hs.c.ClientShortId)
}
if (config.MinClientVer == nil || Value(hs.c.ClientVer[:]...) >= Value(config.MinClientVer...)) &&
(config.MaxClientVer == nil || Value(hs.c.ClientVer[:]...) <= Value(config.MaxClientVer...)) &&
(config.MaxTimeDiff == 0 || time.Since(hs.c.ClientTime).Abs() <= config.MaxTimeDiff) &&
(config.ShortIds[hs.c.ClientShortId]) {
hs.c.conn = conn
}
hs.clientHello.keyShares[0].group = CurveID(i)
break
}
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ths.c.conn == conn: %v\n", remoteAddr, hs.c.conn == conn)
}
if hs.c.conn == conn {
done = true
}
break
}
if done {
mutex.Unlock()
} else {
copying = true
mutex.Unlock()
io.CopyBuffer(target, underlying, buf)
}
waitGroup.Done()
}()
go func() {
done := false
buf := make([]byte, size)
handshakeLen := 0
f:
for {
runtime.Gosched()
n, err := target.Read(buf)
if n == 0 {
if err != nil {
conn.Close()
waitGroup.Done()
return
}
continue
}
mutex.Lock()
s2cSaved = append(s2cSaved, buf[:n]...)
if hs.c == nil || hs.c.conn != conn {
if _, err = conn.Write(buf[:n]); err != nil {
done = true
break
}
if copying || len(s2cSaved) > size { // follow; too long
break
}
mutex.Unlock()
continue
}
done = true // special
if len(s2cSaved) > size {
break
}
for i, t := range types {
if hs.c.out.handshakeLen[i] != 0 {
continue
}
if i == 6 && len(s2cSaved) == 0 {
break
}
if handshakeLen == 0 && len(s2cSaved) > recordHeaderLen {
if Value(s2cSaved[1:3]...) != VersionTLS12 ||
(i == 0 && (recordType(s2cSaved[0]) != recordTypeHandshake || s2cSaved[5] != typeServerHello)) ||
(i == 1 && (recordType(s2cSaved[0]) != recordTypeChangeCipherSpec || s2cSaved[5] != 1)) ||
(i > 1 && recordType(s2cSaved[0]) != recordTypeApplicationData) {
break f
}
handshakeLen = recordHeaderLen + Value(s2cSaved[3:5]...)
}
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\tlen(s2cSaved): %v\t%v: %v\n", remoteAddr, len(s2cSaved), t, handshakeLen)
}
if handshakeLen > size { // too long
break f
}
if i == 1 && handshakeLen > 0 && handshakeLen != 6 {
break f
}
if i == 2 && handshakeLen > 512 {
hs.c.out.handshakeLen[i] = handshakeLen
hs.c.out.handshakeBuf = buf[:0]
break
}
if i == 6 && handshakeLen > 0 {
hs.c.out.handshakeLen[i] = handshakeLen
break
}
if handshakeLen == 0 || len(s2cSaved) < handshakeLen {
mutex.Unlock()
continue f
}
if i == 0 {
hs.hello = new(serverHelloMsg)
if !hs.hello.unmarshal(s2cSaved[recordHeaderLen:handshakeLen]) ||
hs.hello.vers != VersionTLS12 || hs.hello.supportedVersion != VersionTLS13 ||
cipherSuiteTLS13ByID(hs.hello.cipherSuite) == nil ||
hs.hello.serverShare.group != X25519 || len(hs.hello.serverShare.data) != 32 {
break f
}
}
hs.c.out.handshakeLen[i] = handshakeLen
s2cSaved = s2cSaved[handshakeLen:]
handshakeLen = 0
}
start := time.Now()
err = hs.handshake()
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ths.handshake() err: %v\n", remoteAddr, err)
}
if err != nil {
break
}
go func() { // TODO: Probe target's maxUselessRecords and some time-outs in advance.
if handshakeLen-len(s2cSaved) > 0 {
io.ReadFull(target, buf[:handshakeLen-len(s2cSaved)])
}
if n, err := target.Read(buf); !hs.c.handshakeComplete() {
if err != nil {
conn.Close()
}
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ttime.Since(start): %v\tn: %v\terr: %v\n", remoteAddr, time.Since(start), n, err)
}
}
}()
err = hs.readClientFinished()
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\ths.readClientFinished() err: %v\n", remoteAddr, err)
}
if err != nil {
break
}
atomic.StoreUint32(&hs.c.handshakeStatus, 1)
handled = true
break
}
if done {
mutex.Unlock()
} else {
copying = true
mutex.Unlock()
io.CopyBuffer(underlying, target, buf)
}
waitGroup.Done()
}()
waitGroup.Wait()
target.Close()
if config.Show {
fmt.Printf("REALITY remoteAddr: %v\thandled: %v\n", remoteAddr, handled)
}
if handled {
return hs.c, nil
}
conn.Close()
return nil, errors.New("REALITY: processed invalid connection")
/*
c := &Conn{
conn: conn,
config: config,
}
c.handshakeFn = c.serverHandshake
return c
*/
}
// Client returns a new TLS client side connection
// using conn as the underlying transport.
// The config cannot be nil: users must set either ServerName or
// InsecureSkipVerify in the config.
func Client(conn net.Conn, config *Config) *Conn {
c := &Conn{
conn: conn,
config: config,
isClient: true,
}
c.handshakeFn = c.clientHandshake
return c
}
// A listener implements a network listener (net.Listener) for TLS connections.
type listener struct {
net.Listener
config *Config
conns chan net.Conn
err error
}
// Accept waits for and returns the next incoming TLS connection.
// The returned connection is of type *Conn.
func (l *listener) Accept() (net.Conn, error) {
/*
c, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return Server(c, l.config), nil
*/
if c, ok := <-l.conns; ok {
return c, nil
}
return nil, l.err
}
// NewListener creates a Listener which accepts connections from an inner
// Listener and wraps each connection with Server.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func NewListener(inner net.Listener, config *Config) net.Listener {
l := new(listener)
l.Listener = inner
l.config = config
{
l.conns = make(chan net.Conn)
go func() {
for {
c, err := l.Listener.Accept()
if err != nil {
l.err = err
close(l.conns)
return
}
go func() {
defer recover()
c, err = Server(context.Background(), c, l.config)
if err == nil {
l.conns <- c
}
}()
}
}()
}
return l
}
// Listen creates a TLS listener accepting connections on the
// given network address using net.Listen.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Listen(network, laddr string, config *Config) (net.Listener, error) {
if config == nil || len(config.Certificates) == 0 &&
config.GetCertificate == nil && config.GetConfigForClient == nil {
return nil, errors.New("tls: neither Certificates, GetCertificate, nor GetConfigForClient set in Config")
}
l, err := net.Listen(network, laddr)
if err != nil {
return nil, err
}
return NewListener(l, config), nil
}
type timeoutError struct{}
func (timeoutError) Error() string { return "tls: DialWithDialer timed out" }
func (timeoutError) Timeout() bool { return true }
func (timeoutError) Temporary() bool { return true }
// DialWithDialer connects to the given network address using dialer.Dial and
// then initiates a TLS handshake, returning the resulting TLS connection. Any
// timeout or deadline given in the dialer apply to connection and TLS
// handshake as a whole.
//
// DialWithDialer interprets a nil configuration as equivalent to the zero
// configuration; see the documentation of Config for the defaults.
//
// DialWithDialer uses context.Background internally; to specify the context,
// use Dialer.DialContext with NetDialer set to the desired dialer.
func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
return dial(context.Background(), dialer, network, addr, config)
}
func dial(ctx context.Context, netDialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
if netDialer.Timeout != 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, netDialer.Timeout)
defer cancel()
}
if !netDialer.Deadline.IsZero() {
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, netDialer.Deadline)
defer cancel()
}
rawConn, err := netDialer.DialContext(ctx, network, addr)
if err != nil {
return nil, err
}
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
if config == nil {
config = defaultConfig()
}
// If no ServerName is set, infer the ServerName
// from the hostname we're connecting to.
if config.ServerName == "" {
// Make a copy to avoid polluting argument or default.
c := config.Clone()
c.ServerName = hostname
config = c
}
conn := Client(rawConn, config)
if err := conn.HandshakeContext(ctx); err != nil {
rawConn.Close()
return nil, err
}
return conn, nil
}
// Dial connects to the given network address using net.Dial
// and then initiates a TLS handshake, returning the resulting
// TLS connection.
// Dial interprets a nil configuration as equivalent to
// the zero configuration; see the documentation of Config
// for the defaults.
func Dial(network, addr string, config *Config) (*Conn, error) {
return DialWithDialer(new(net.Dialer), network, addr, config)
}
// Dialer dials TLS connections given a configuration and a Dialer for the
// underlying connection.
type Dialer struct {
// NetDialer is the optional dialer to use for the TLS connections'
// underlying TCP connections.
// A nil NetDialer is equivalent to the net.Dialer zero value.
NetDialer *net.Dialer
// Config is the TLS configuration to use for new connections.
// A nil configuration is equivalent to the zero
// configuration; see the documentation of Config for the
// defaults.
Config *Config
}
// Dial connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The returned Conn, if any, will always be of type *Conn.
//
// Dial uses context.Background internally; to specify the context,
// use DialContext.
func (d *Dialer) Dial(network, addr string) (net.Conn, error) {
return d.DialContext(context.Background(), network, addr)
}
func (d *Dialer) netDialer() *net.Dialer {
if d.NetDialer != nil {
return d.NetDialer
}
return new(net.Dialer)
}
// DialContext connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The provided Context must be non-nil. If the context expires before
// the connection is complete, an error is returned. Once successfully
// connected, any expiration of the context will not affect the
// connection.
//
// The returned Conn, if any, will always be of type *Conn.
func (d *Dialer) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
c, err := dial(ctx, d.netDialer(), network, addr, d.Config)
if err != nil {
// Don't return c (a typed nil) in an interface.
return nil, err
}
return c, nil
}
// LoadX509KeyPair reads and parses a public/private key pair from a pair
// of files. The files must contain PEM encoded data. The certificate file
// may contain intermediate certificates following the leaf certificate to
// form a certificate chain. On successful return, Certificate.Leaf will
// be nil because the parsed form of the certificate is not retained.
func LoadX509KeyPair(certFile, keyFile string) (Certificate, error) {
certPEMBlock, err := os.ReadFile(certFile)
if err != nil {
return Certificate{}, err
}
keyPEMBlock, err := os.ReadFile(keyFile)
if err != nil {
return Certificate{}, err
}
return X509KeyPair(certPEMBlock, keyPEMBlock)
}
// X509KeyPair parses a public/private key pair from a pair of
// PEM encoded data. On successful return, Certificate.Leaf will be nil because
// the parsed form of the certificate is not retained.
func X509KeyPair(certPEMBlock, keyPEMBlock []byte) (Certificate, error) {
fail := func(err error) (Certificate, error) { return Certificate{}, err }
var cert Certificate
var skippedBlockTypes []string
for {
var certDERBlock *pem.Block
certDERBlock, certPEMBlock = pem.Decode(certPEMBlock)
if certDERBlock == nil {
break
}
if certDERBlock.Type == "CERTIFICATE" {
cert.Certificate = append(cert.Certificate, certDERBlock.Bytes)
} else {
skippedBlockTypes = append(skippedBlockTypes, certDERBlock.Type)
}
}
if len(cert.Certificate) == 0 {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in certificate input"))
}
if len(skippedBlockTypes) == 1 && strings.HasSuffix(skippedBlockTypes[0], "PRIVATE KEY") {
return fail(errors.New("tls: failed to find certificate PEM data in certificate input, but did find a private key; PEM inputs may have been switched"))
}
return fail(fmt.Errorf("tls: failed to find \"CERTIFICATE\" PEM block in certificate input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
skippedBlockTypes = skippedBlockTypes[:0]
var keyDERBlock *pem.Block
for {
keyDERBlock, keyPEMBlock = pem.Decode(keyPEMBlock)
if keyDERBlock == nil {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in key input"))
}
if len(skippedBlockTypes) == 1 && skippedBlockTypes[0] == "CERTIFICATE" {
return fail(errors.New("tls: found a certificate rather than a key in the PEM for the private key"))
}
return fail(fmt.Errorf("tls: failed to find PEM block with type ending in \"PRIVATE KEY\" in key input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
if keyDERBlock.Type == "PRIVATE KEY" || strings.HasSuffix(keyDERBlock.Type, " PRIVATE KEY") {
break
}
skippedBlockTypes = append(skippedBlockTypes, keyDERBlock.Type)
}
// We don't need to parse the public key for TLS, but we so do anyway
// to check that it looks sane and matches the private key.
x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return fail(err)
}
cert.PrivateKey, err = parsePrivateKey(keyDERBlock.Bytes)
if err != nil {
return fail(err)
}
switch pub := x509Cert.PublicKey.(type) {
case *rsa.PublicKey:
priv, ok := cert.PrivateKey.(*rsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.N.Cmp(priv.N) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case *ecdsa.PublicKey:
priv, ok := cert.PrivateKey.(*ecdsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.X.Cmp(priv.X) != 0 || pub.Y.Cmp(priv.Y) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case ed25519.PublicKey:
priv, ok := cert.PrivateKey.(ed25519.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if !bytes.Equal(priv.Public().(ed25519.PublicKey), pub) {
return fail(errors.New("tls: private key does not match public key"))
}
default:
return fail(errors.New("tls: unknown public key algorithm"))
}
return cert, nil
}
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
// PKCS #1 private keys by default, while OpenSSL 1.0.0 generates PKCS #8 keys.
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
return key, nil
default:
return nil, errors.New("tls: found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, errors.New("tls: failed to parse private key")
}
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