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