// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <string>

#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "net/base/net_util.h"
#include "net/base/request_priority.h"
#include "net/dns/mock_host_resolver.h"
#include "net/http/http_auth_handler_mock.h"
#include "net/http/http_network_session.h"
#include "net/http/http_network_transaction.h"
#include "net/http/http_request_info.h"
#include "net/http/http_server_properties_impl.h"
#include "net/http/transport_security_state.h"
#include "net/proxy/proxy_service.h"
#include "net/socket/socket_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace net {

namespace {

class TLS10SSLConfigService : public SSLConfigService {
 public:
  TLS10SSLConfigService() {
    ssl_config_.version_min = SSL_PROTOCOL_VERSION_TLS1;
    ssl_config_.version_max = SSL_PROTOCOL_VERSION_TLS1;
  }

  void GetSSLConfig(SSLConfig* config) override { *config = ssl_config_; }

 private:
  ~TLS10SSLConfigService() override {}

  SSLConfig ssl_config_;
};

class TLS12SSLConfigService : public SSLConfigService {
 public:
  TLS12SSLConfigService() {
    ssl_config_.version_min = SSL_PROTOCOL_VERSION_TLS1;
    ssl_config_.version_max = SSL_PROTOCOL_VERSION_TLS1_2;
  }

  void GetSSLConfig(SSLConfig* config) override { *config = ssl_config_; }

 private:
  ~TLS12SSLConfigService() override {}

  SSLConfig ssl_config_;
};

}  // namespace

class HttpNetworkTransactionSSLTest : public testing::Test {
 protected:
  void SetUp() override {
    ssl_config_service_ = new TLS10SSLConfigService;
    session_params_.ssl_config_service = ssl_config_service_.get();

    auth_handler_factory_.reset(new HttpAuthHandlerMock::Factory());
    session_params_.http_auth_handler_factory = auth_handler_factory_.get();

    proxy_service_.reset(ProxyService::CreateDirect());
    session_params_.proxy_service = proxy_service_.get();

    session_params_.client_socket_factory = &mock_socket_factory_;
    session_params_.host_resolver = &mock_resolver_;
    session_params_.http_server_properties =
        http_server_properties_.GetWeakPtr();
    session_params_.transport_security_state = &transport_security_state_;
  }

  HttpRequestInfo* GetRequestInfo(const std::string& url) {
    HttpRequestInfo* request_info = new HttpRequestInfo;
    request_info->url = GURL(url);
    request_info->method = "GET";
    request_info_vector_.push_back(request_info);
    return request_info;
  }

  SSLConfig& GetServerSSLConfig(HttpNetworkTransaction* trans) {
    return trans->server_ssl_config_;
  }

  scoped_refptr<SSLConfigService> ssl_config_service_;
  scoped_ptr<HttpAuthHandlerMock::Factory> auth_handler_factory_;
  scoped_ptr<ProxyService> proxy_service_;

  MockClientSocketFactory mock_socket_factory_;
  MockHostResolver mock_resolver_;
  HttpServerPropertiesImpl http_server_properties_;
  TransportSecurityState transport_security_state_;
  HttpNetworkSession::Params session_params_;
  ScopedVector<HttpRequestInfo> request_info_vector_;
};

// Tests that HttpNetworkTransaction attempts to fallback from
// TLS 1.2 to TLS 1.1, then from TLS 1.1 to TLS 1.0.
TEST_F(HttpNetworkTransactionSSLTest, SSLFallback) {
  ssl_config_service_ = new TLS12SSLConfigService;
  session_params_.ssl_config_service = ssl_config_service_.get();
  // |ssl_data1| is for the first handshake (TLS 1.2), which will fail
  // for protocol reasons (e.g., simulating a version rollback attack).
  SSLSocketDataProvider ssl_data1(ASYNC, ERR_SSL_PROTOCOL_ERROR);
  mock_socket_factory_.AddSSLSocketDataProvider(&ssl_data1);
  StaticSocketDataProvider data1(NULL, 0, NULL, 0);
  mock_socket_factory_.AddSocketDataProvider(&data1);

  // |ssl_data2| contains the handshake result for a TLS 1.1
  // handshake which will be attempted after the TLS 1.2
  // handshake fails.
  SSLSocketDataProvider ssl_data2(ASYNC, ERR_SSL_PROTOCOL_ERROR);
  mock_socket_factory_.AddSSLSocketDataProvider(&ssl_data2);
  StaticSocketDataProvider data2(NULL, 0, NULL, 0);
  mock_socket_factory_.AddSocketDataProvider(&data2);

  // |ssl_data3| contains the handshake result for a TLS 1.0
  // handshake which will be attempted after the TLS 1.1
  // handshake fails.
  SSLSocketDataProvider ssl_data3(ASYNC, ERR_SSL_PROTOCOL_ERROR);
  mock_socket_factory_.AddSSLSocketDataProvider(&ssl_data3);
  StaticSocketDataProvider data3(NULL, 0, NULL, 0);
  mock_socket_factory_.AddSocketDataProvider(&data3);

  scoped_refptr<HttpNetworkSession> session(
      new HttpNetworkSession(session_params_));
  scoped_ptr<HttpNetworkTransaction> trans(
      new HttpNetworkTransaction(DEFAULT_PRIORITY, session.get()));

  TestCompletionCallback callback;
  // This will consume |ssl_data1|, |ssl_data2| and |ssl_data3|.
  int rv = callback.GetResult(
      trans->Start(GetRequestInfo("https://www.paypal.com/"),
                   callback.callback(), BoundNetLog()));
  EXPECT_EQ(ERR_SSL_PROTOCOL_ERROR, rv);

  SocketDataProviderArray<SocketDataProvider>& mock_data =
      mock_socket_factory_.mock_data();
  // Confirms that |ssl_data1|, |ssl_data2| and |ssl_data3| are consumed.
  EXPECT_EQ(3u, mock_data.next_index());

  SSLConfig& ssl_config = GetServerSSLConfig(trans.get());
  // |version_max| fallbacks to TLS 1.0.
  EXPECT_EQ(SSL_PROTOCOL_VERSION_TLS1, ssl_config.version_max);
  EXPECT_TRUE(ssl_config.version_fallback);
}

}  // namespace net