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https://github.com/XTLS/Xray-core.git
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Fix padding extends out of bound again
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parent
ccba465590
commit
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@ -528,17 +528,17 @@ func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBu
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// XtlsPadding add padding to eliminate length siganature during tls handshake
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func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context) *buf.Buffer {
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var contantLen int32 = 0
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var contentLen int32 = 0
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var paddingLen int32 = 0
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if b != nil {
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contantLen = b.Len()
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contentLen = b.Len()
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}
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if contantLen < 900 && longPadding {
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if contentLen < 900 && longPadding {
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l, err := rand.Int(rand.Reader, big.NewInt(500))
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if err != nil {
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newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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paddingLen = int32(l.Int64()) + 900 - contantLen
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paddingLen = int32(l.Int64()) + 900 - contentLen
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} else {
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l, err := rand.Int(rand.Reader, big.NewInt(256))
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if err != nil {
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@ -546,21 +546,21 @@ func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool
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}
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paddingLen = int32(l.Int64())
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}
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if paddingLen > buf.Size - 21 - contentLen {
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paddingLen = buf.Size - 21 - contentLen
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}
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newbuffer := buf.New()
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if userUUID != nil {
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newbuffer.Write(*userUUID)
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}
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newbuffer.Write([]byte{command, byte(contantLen >> 8), byte(contantLen), byte(paddingLen >> 8), byte(paddingLen)})
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newbuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
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if b != nil {
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newbuffer.Write(b.Bytes())
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b.Release()
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b = nil
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}
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if paddingLen > buf.Size - newbuffer.Len() {
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paddingLen = buf.Size - newbuffer.Len()
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}
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newbuffer.Extend(paddingLen)
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newError("XtlsPadding ", contantLen, " ", paddingLen, " ", command).WriteToLog(session.ExportIDToError(ctx))
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newError("XtlsPadding ", contentLen, " ", paddingLen, " ", command).WriteToLog(session.ExportIDToError(ctx))
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return newbuffer
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}
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