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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef tls_parser_h_
#define tls_parser_h_
#include <cstdint>
#include <cstring>
#include <memory>
#if defined(WIN32) || defined(WIN64)
#include <winsock2.h>
#else
#include <arpa/inet.h>
#endif
#include "databuffer.h"
namespace nss_test {
const uint8_t kTlsChangeCipherSpecType = 20;
const uint8_t kTlsAlertType = 21;
const uint8_t kTlsHandshakeType = 22;
const uint8_t kTlsApplicationDataType = 23;
const uint8_t kTlsHandshakeClientHello = 1;
const uint8_t kTlsHandshakeServerHello = 2;
const uint8_t kTlsHandshakeHelloRetryRequest = 6;
const uint8_t kTlsHandshakeEncryptedExtensions = 8;
const uint8_t kTlsHandshakeCertificate = 11;
const uint8_t kTlsHandshakeServerKeyExchange = 12;
const uint8_t kTlsHandshakeCertificateVerify = 15;
const uint8_t kTlsHandshakeClientKeyExchange = 16;
const uint8_t kTlsHandshakeFinished = 20;
const uint8_t kTlsAlertWarning = 1;
const uint8_t kTlsAlertFatal = 2;
const uint8_t kTlsAlertUnexpectedMessage = 10;
const uint8_t kTlsAlertBadRecordMac = 20;
const uint8_t kTlsAlertHandshakeFailure = 40;
const uint8_t kTlsAlertIllegalParameter = 47;
const uint8_t kTlsAlertDecodeError = 50;
const uint8_t kTlsAlertDecryptError = 51;
const uint8_t kTlsAlertMissingExtension = 109;
const uint8_t kTlsAlertUnsupportedExtension = 110;
const uint8_t kTlsAlertUnrecognizedName = 112;
const uint8_t kTlsAlertNoApplicationProtocol = 120;
const uint8_t kTlsFakeChangeCipherSpec[] = {
kTlsChangeCipherSpecType, // Type
0xfe,
0xff, // Version
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x00,
0x10, // Fictitious sequence #
0x00,
0x01, // Length
0x01 // Value
};
static const uint8_t kTls13PskKe = 0;
static const uint8_t kTls13PskDhKe = 1;
static const uint8_t kTls13PskAuth = 0;
static const uint8_t kTls13PskSignAuth = 1;
inline bool IsDtls(uint16_t version) { return (version & 0x8000) == 0x8000; }
inline uint16_t NormalizeTlsVersion(uint16_t version) {
if (version == 0xfeff) {
return 0x0302; // special: DTLS 1.0 == TLS 1.1
}
if (IsDtls(version)) {
return (version ^ 0xffff) + 0x0201;
}
return version;
}
inline uint16_t TlsVersionToDtlsVersion(uint16_t version) {
if (version == 0x0302) {
return 0xfeff;
}
if (version == 0x0304) {
return version;
}
return 0xffff - version + 0x0201;
}
inline size_t WriteVariable(DataBuffer* target, size_t index,
const DataBuffer& buf, size_t len_size) {
index = target->Write(index, static_cast<uint32_t>(buf.len()), len_size);
return target->Write(index, buf.data(), buf.len());
}
class TlsParser {
public:
TlsParser(const uint8_t* data, size_t len) : buffer_(data, len), offset_(0) {}
explicit TlsParser(const DataBuffer& buf) : buffer_(buf), offset_(0) {}
bool Read(uint8_t* val);
// Read an integral type of specified width.
bool Read(uint32_t* val, size_t size);
// Reads len bytes into dest buffer, overwriting it.
bool Read(DataBuffer* dest, size_t len);
// Reads bytes into dest buffer, overwriting it. The number of bytes is
// determined by reading from len_size bytes from the stream first.
bool ReadVariable(DataBuffer* dest, size_t len_size);
bool Skip(size_t len);
bool SkipVariable(size_t len_size);
size_t consumed() const { return offset_; }
size_t remaining() const { return buffer_.len() - offset_; }
private:
void consume(size_t len) { offset_ += len; }
const uint8_t* ptr() const { return buffer_.data() + offset_; }
DataBuffer buffer_;
size_t offset_;
};
} // namespace nss_test
#endif
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