mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-14 16:25:57 -05:00
345 lines
7.6 KiB
Go
345 lines
7.6 KiB
Go
package crypto
|
|
|
|
import (
|
|
"crypto/cipher"
|
|
"io"
|
|
"math/rand"
|
|
|
|
"v2ray.com/core/common"
|
|
"v2ray.com/core/common/buf"
|
|
"v2ray.com/core/common/bytespool"
|
|
"v2ray.com/core/common/protocol"
|
|
)
|
|
|
|
type BytesGenerator func() []byte
|
|
|
|
func GenerateEmptyBytes() BytesGenerator {
|
|
var b [1]byte
|
|
return func() []byte {
|
|
return b[:0]
|
|
}
|
|
}
|
|
|
|
func GenerateStaticBytes(content []byte) BytesGenerator {
|
|
return func() []byte {
|
|
return content
|
|
}
|
|
}
|
|
|
|
func GenerateIncreasingNonce(nonce []byte) BytesGenerator {
|
|
c := append([]byte(nil), nonce...)
|
|
return func() []byte {
|
|
for i := range c {
|
|
c[i]++
|
|
if c[i] != 0 {
|
|
break
|
|
}
|
|
}
|
|
return c
|
|
}
|
|
}
|
|
|
|
func GenerateInitialAEADNonce() BytesGenerator {
|
|
return GenerateIncreasingNonce([]byte{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF})
|
|
}
|
|
|
|
type Authenticator interface {
|
|
NonceSize() int
|
|
Overhead() int
|
|
Open(dst, cipherText []byte) ([]byte, error)
|
|
Seal(dst, plainText []byte) ([]byte, error)
|
|
}
|
|
|
|
type AEADAuthenticator struct {
|
|
cipher.AEAD
|
|
NonceGenerator BytesGenerator
|
|
AdditionalDataGenerator BytesGenerator
|
|
}
|
|
|
|
func (v *AEADAuthenticator) Open(dst, cipherText []byte) ([]byte, error) {
|
|
iv := v.NonceGenerator()
|
|
if len(iv) != v.AEAD.NonceSize() {
|
|
return nil, newError("invalid AEAD nonce size: ", len(iv))
|
|
}
|
|
|
|
var additionalData []byte
|
|
if v.AdditionalDataGenerator != nil {
|
|
additionalData = v.AdditionalDataGenerator()
|
|
}
|
|
return v.AEAD.Open(dst, iv, cipherText, additionalData)
|
|
}
|
|
|
|
func (v *AEADAuthenticator) Seal(dst, plainText []byte) ([]byte, error) {
|
|
iv := v.NonceGenerator()
|
|
if len(iv) != v.AEAD.NonceSize() {
|
|
return nil, newError("invalid AEAD nonce size: ", len(iv))
|
|
}
|
|
|
|
var additionalData []byte
|
|
if v.AdditionalDataGenerator != nil {
|
|
additionalData = v.AdditionalDataGenerator()
|
|
}
|
|
return v.AEAD.Seal(dst, iv, plainText, additionalData), nil
|
|
}
|
|
|
|
type AuthenticationReader struct {
|
|
auth Authenticator
|
|
reader *buf.BufferedReader
|
|
sizeParser ChunkSizeDecoder
|
|
sizeBytes []byte
|
|
transferType protocol.TransferType
|
|
padding PaddingLengthGenerator
|
|
size uint16
|
|
paddingLen uint16
|
|
hasSize bool
|
|
done bool
|
|
}
|
|
|
|
func NewAuthenticationReader(auth Authenticator, sizeParser ChunkSizeDecoder, reader io.Reader, transferType protocol.TransferType, paddingLen PaddingLengthGenerator) *AuthenticationReader {
|
|
r := &AuthenticationReader{
|
|
auth: auth,
|
|
sizeParser: sizeParser,
|
|
transferType: transferType,
|
|
padding: paddingLen,
|
|
sizeBytes: make([]byte, sizeParser.SizeBytes()),
|
|
}
|
|
if breader, ok := reader.(*buf.BufferedReader); ok {
|
|
r.reader = breader
|
|
} else {
|
|
r.reader = &buf.BufferedReader{Reader: buf.NewReader(reader)}
|
|
}
|
|
return r
|
|
}
|
|
|
|
func (r *AuthenticationReader) readSize() (uint16, uint16, error) {
|
|
if r.hasSize {
|
|
r.hasSize = false
|
|
return r.size, r.paddingLen, nil
|
|
}
|
|
if _, err := io.ReadFull(r.reader, r.sizeBytes); err != nil {
|
|
return 0, 0, err
|
|
}
|
|
var padding uint16
|
|
if r.padding != nil {
|
|
padding = r.padding.NextPaddingLen()
|
|
}
|
|
size, err := r.sizeParser.Decode(r.sizeBytes)
|
|
return size, padding, err
|
|
}
|
|
|
|
var errSoft = newError("waiting for more data")
|
|
|
|
func (r *AuthenticationReader) readBuffer(size int32, padding int32) (*buf.Buffer, error) {
|
|
b := buf.New()
|
|
if _, err := b.ReadFullFrom(r.reader, size); err != nil {
|
|
b.Release()
|
|
return nil, err
|
|
}
|
|
size -= padding
|
|
rb, err := r.auth.Open(b.BytesTo(0), b.BytesTo(size))
|
|
if err != nil {
|
|
b.Release()
|
|
return nil, err
|
|
}
|
|
b.Resize(0, int32(len(rb)))
|
|
return b, nil
|
|
}
|
|
|
|
func (r *AuthenticationReader) readInternal(soft bool, mb *buf.MultiBuffer) error {
|
|
if soft && r.reader.BufferedBytes() < r.sizeParser.SizeBytes() {
|
|
return errSoft
|
|
}
|
|
|
|
if r.done {
|
|
return io.EOF
|
|
}
|
|
|
|
size, padding, err := r.readSize()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if size == uint16(r.auth.Overhead())+padding {
|
|
r.done = true
|
|
return io.EOF
|
|
}
|
|
|
|
if soft && int32(size) > r.reader.BufferedBytes() {
|
|
r.size = size
|
|
r.paddingLen = padding
|
|
r.hasSize = true
|
|
return errSoft
|
|
}
|
|
|
|
if size <= buf.Size {
|
|
b, err := r.readBuffer(int32(size), int32(padding))
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
*mb = append(*mb, b)
|
|
return nil
|
|
}
|
|
|
|
payload := bytespool.Alloc(int32(size))
|
|
defer bytespool.Free(payload)
|
|
|
|
if _, err := io.ReadFull(r.reader, payload[:size]); err != nil {
|
|
return err
|
|
}
|
|
|
|
size -= padding
|
|
|
|
rb, err := r.auth.Open(payload[:0], payload[:size])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*mb = buf.MergeBytes(*mb, rb)
|
|
return nil
|
|
}
|
|
|
|
func (r *AuthenticationReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
|
|
const readSize = 16
|
|
mb := make(buf.MultiBuffer, 0, readSize)
|
|
if err := r.readInternal(false, &mb); err != nil {
|
|
buf.ReleaseMulti(mb)
|
|
return nil, err
|
|
}
|
|
|
|
for i := 1; i < readSize; i++ {
|
|
err := r.readInternal(true, &mb)
|
|
if err == errSoft || err == io.EOF {
|
|
break
|
|
}
|
|
if err != nil {
|
|
buf.ReleaseMulti(mb)
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return mb, nil
|
|
}
|
|
|
|
type AuthenticationWriter struct {
|
|
auth Authenticator
|
|
writer buf.Writer
|
|
sizeParser ChunkSizeEncoder
|
|
transferType protocol.TransferType
|
|
padding PaddingLengthGenerator
|
|
}
|
|
|
|
func NewAuthenticationWriter(auth Authenticator, sizeParser ChunkSizeEncoder, writer io.Writer, transferType protocol.TransferType, padding PaddingLengthGenerator) *AuthenticationWriter {
|
|
w := &AuthenticationWriter{
|
|
auth: auth,
|
|
writer: buf.NewWriter(writer),
|
|
sizeParser: sizeParser,
|
|
transferType: transferType,
|
|
}
|
|
if padding != nil {
|
|
w.padding = padding
|
|
}
|
|
return w
|
|
}
|
|
|
|
func (w *AuthenticationWriter) seal(b []byte) (*buf.Buffer, error) {
|
|
encryptedSize := int32(len(b) + w.auth.Overhead())
|
|
var paddingSize int32
|
|
if w.padding != nil {
|
|
paddingSize = int32(w.padding.NextPaddingLen())
|
|
}
|
|
|
|
totalSize := encryptedSize + paddingSize
|
|
if totalSize > buf.Size {
|
|
return nil, newError("size too large: ", totalSize)
|
|
}
|
|
|
|
eb := buf.New()
|
|
w.sizeParser.Encode(uint16(encryptedSize+paddingSize), eb.Extend(w.sizeParser.SizeBytes()))
|
|
if _, err := w.auth.Seal(eb.Extend(encryptedSize)[:0], b); err != nil {
|
|
eb.Release()
|
|
return nil, err
|
|
}
|
|
if paddingSize > 0 {
|
|
// With size of the chunk and padding length encrypted, the content of padding doesn't matter much.
|
|
paddingBytes := eb.Extend(paddingSize)
|
|
common.Must2(rand.Read(paddingBytes))
|
|
}
|
|
|
|
return eb, nil
|
|
}
|
|
|
|
func (w *AuthenticationWriter) writeStream(mb buf.MultiBuffer) error {
|
|
defer buf.ReleaseMulti(mb)
|
|
|
|
var maxPadding int32
|
|
if w.padding != nil {
|
|
maxPadding = int32(w.padding.MaxPaddingLen())
|
|
}
|
|
|
|
payloadSize := buf.Size - int32(w.auth.Overhead()) - w.sizeParser.SizeBytes() - maxPadding
|
|
mb2Write := make(buf.MultiBuffer, 0, len(mb)+10)
|
|
|
|
temp := buf.New()
|
|
defer temp.Release()
|
|
|
|
rawBytes := temp.Extend(payloadSize)
|
|
|
|
for {
|
|
nb, nBytes := buf.SplitBytes(mb, rawBytes)
|
|
mb = nb
|
|
|
|
eb, err := w.seal(rawBytes[:nBytes])
|
|
|
|
if err != nil {
|
|
buf.ReleaseMulti(mb2Write)
|
|
return err
|
|
}
|
|
mb2Write = append(mb2Write, eb)
|
|
if mb.IsEmpty() {
|
|
break
|
|
}
|
|
}
|
|
|
|
return w.writer.WriteMultiBuffer(mb2Write)
|
|
}
|
|
|
|
func (w *AuthenticationWriter) writePacket(mb buf.MultiBuffer) error {
|
|
defer buf.ReleaseMulti(mb)
|
|
|
|
mb2Write := make(buf.MultiBuffer, 0, len(mb)+1)
|
|
|
|
for _, b := range mb {
|
|
if b.IsEmpty() {
|
|
continue
|
|
}
|
|
|
|
eb, err := w.seal(b.Bytes())
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
mb2Write = append(mb2Write, eb)
|
|
}
|
|
|
|
if mb2Write.IsEmpty() {
|
|
return nil
|
|
}
|
|
|
|
return w.writer.WriteMultiBuffer(mb2Write)
|
|
}
|
|
|
|
// WriteMultiBuffer implements buf.Writer.
|
|
func (w *AuthenticationWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
|
|
if mb.IsEmpty() {
|
|
eb, err := w.seal([]byte{})
|
|
common.Must(err)
|
|
return w.writer.WriteMultiBuffer(buf.MultiBuffer{eb})
|
|
}
|
|
|
|
if w.transferType == protocol.TransferTypeStream {
|
|
return w.writeStream(mb)
|
|
}
|
|
|
|
return w.writePacket(mb)
|
|
}
|