settings_writer.cc

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/* Copyright (c) 2018, Google Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
 
#include "settings_writer.h"
 
#include <stdio.h>
 
#include <openssl/ssl.h>
 
#include "fuzzer_tags.h"
#include "test_config.h"
 
 
SettingsWriter::SettingsWriter() {}
 
bool SettingsWriter::Init(int i, const TestConfig *config,
                          SSL_SESSION *session) {
  if (config->write_settings.empty()) {
    return true;
  }
  // Treat write_settings as a path prefix for each connection in the run.
  char buf[DECIMAL_SIZE(int)];
  snprintf(buf, sizeof(buf), "%d", i);
  path_ = config->write_settings + buf;
 
  if (!CBB_init(cbb_.get(), 64)) {
    return false;
  }
 
  if (session != nullptr) {
    uint8_t *data;
    size_t len;
    if (!SSL_SESSION_to_bytes(session, &data, &len)) {
      return false;
    }
    bssl::UniquePtr<uint8_t> free_data(data);
    CBB child;
    if (!CBB_add_u16(cbb_.get(), kSessionTag) ||
        !CBB_add_u24_length_prefixed(cbb_.get(), &child) ||
        !CBB_add_bytes(&child, data, len) || !CBB_flush(cbb_.get())) {
      return false;
    }
  }
 
  if (config->is_server &&
      (config->require_any_client_certificate || config->verify_peer) &&
      !CBB_add_u16(cbb_.get(), kRequestClientCert)) {
    return false;
  }
 
  return true;
}
 
bool SettingsWriter::Commit() {
  if (path_.empty()) {
    return true;
  }
 
  uint8_t *settings;
  size_t settings_len;
  if (!CBB_add_u16(cbb_.get(), kDataTag) ||
      !CBB_finish(cbb_.get(), &settings, &settings_len)) {
    return false;
  }
  bssl::UniquePtr<uint8_t> free_settings(settings);
 
  using ScopedFILE = std::unique_ptr<FILE, decltype(&fclose)>;
  ScopedFILE file(fopen(path_.c_str(), "w"), fclose);
  if (!file) {
    return false;
  }
 
  return fwrite(settings, settings_len, 1, file.get()) == 1;
}
 
bool SettingsWriter::WriteHandoff(bssl::Span<const uint8_t> handoff) {
  return WriteData(kHandoffTag, handoff);
}
 
bool SettingsWriter::WriteHandback(bssl::Span<const uint8_t> handback) {
  return WriteData(kHandbackTag, handback);
}
 
bool SettingsWriter::WriteHints(bssl::Span<const uint8_t> hints) {
  return WriteData(kHintsTag, hints);
}
 
bool SettingsWriter::WriteData(uint16_t tag, bssl::Span<const uint8_t> data) {
  if (path_.empty()) {
    return true;
  }
 
  CBB child;
  if (!CBB_add_u16(cbb_.get(), tag) ||
      !CBB_add_u24_length_prefixed(cbb_.get(), &child) ||
      !CBB_add_bytes(&child, data.data(), data.size()) ||
      !CBB_flush(cbb_.get())) {
    return false;
  }
  return true;
}