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// Copyright 2015 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 "components/cryptauth/device_to_device_secure_context.h"
#include <memory>
#include "base/bind.h"
#include "base/callback.h"
#include "components/cryptauth/fake_secure_message_delegate.h"
#include "components/cryptauth/proto/cryptauth_api.pb.h"
#include "components/cryptauth/proto/securemessage.pb.h"
#include "components/cryptauth/session_keys.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace cryptauth {
namespace {
const char kSymmetricKey[] = "symmetric key";
const char kResponderAuthMessage[] = "responder_auth_message";
const SecureContext::ProtocolVersion kProtocolVersion =
SecureContext::PROTOCOL_VERSION_THREE_ONE;
// Callback saving |result| to |result_out|.
void SaveResult(std::string* result_out, const std::string& result) {
*result_out = result;
}
// The responder's secure context will have the encoding / decoding keys
// inverted.
class InvertedSessionKeys : public SessionKeys {
public:
explicit InvertedSessionKeys(const std::string& master_symmetric_key)
: SessionKeys(master_symmetric_key) {}
InvertedSessionKeys() : SessionKeys() {}
InvertedSessionKeys(const InvertedSessionKeys& other) : SessionKeys(other) {}
std::string initiator_encode_key() const override {
return SessionKeys::responder_encode_key();
}
std::string responder_encode_key() const override {
return SessionKeys::initiator_encode_key();
}
};
} // namespace
class ProximityAuthDeviceToDeviceSecureContextTest : public testing::Test {
protected:
ProximityAuthDeviceToDeviceSecureContextTest()
: secure_context_(std::make_unique<FakeSecureMessageDelegate>(),
SessionKeys(kSymmetricKey),
kResponderAuthMessage,
kProtocolVersion) {}
DeviceToDeviceSecureContext secure_context_;
};
TEST_F(ProximityAuthDeviceToDeviceSecureContextTest, GetProperties) {
EXPECT_EQ(kResponderAuthMessage, secure_context_.GetChannelBindingData());
EXPECT_EQ(kProtocolVersion, secure_context_.GetProtocolVersion());
}
TEST_F(ProximityAuthDeviceToDeviceSecureContextTest, CheckEncodedHeader) {
std::string message = "encrypt this message";
std::string encoded_message;
secure_context_.Encode(message, base::Bind(&SaveResult, &encoded_message));
securemessage::SecureMessage secure_message;
ASSERT_TRUE(secure_message.ParseFromString(encoded_message));
securemessage::HeaderAndBody header_and_body;
ASSERT_TRUE(
header_and_body.ParseFromString(secure_message.header_and_body()));
GcmMetadata gcm_metadata;
ASSERT_TRUE(
gcm_metadata.ParseFromString(header_and_body.header().public_metadata()));
EXPECT_EQ(1, gcm_metadata.version());
EXPECT_EQ(DEVICE_TO_DEVICE_MESSAGE, gcm_metadata.type());
}
TEST_F(ProximityAuthDeviceToDeviceSecureContextTest, DecodeInvalidMessage) {
std::string encoded_message = "invalidly encoded message";
std::string decoded_message = "not empty";
secure_context_.Decode(encoded_message,
base::Bind(&SaveResult, &decoded_message));
EXPECT_TRUE(decoded_message.empty());
}
TEST_F(ProximityAuthDeviceToDeviceSecureContextTest, EncodeAndDecode) {
// Initialize second secure channel with the same parameters as the first.
InvertedSessionKeys inverted_session_keys(kSymmetricKey);
DeviceToDeviceSecureContext secure_context2(
std::make_unique<FakeSecureMessageDelegate>(), inverted_session_keys,
kResponderAuthMessage, kProtocolVersion);
std::string message = "encrypt this message";
SessionKeys session_keys(kSymmetricKey);
EXPECT_EQ(session_keys.initiator_encode_key(),
inverted_session_keys.responder_encode_key());
EXPECT_EQ(session_keys.responder_encode_key(),
inverted_session_keys.initiator_encode_key());
// Pass some messages between the two secure contexts.
for (int i = 0; i < 3; ++i) {
std::string encoded_message;
secure_context_.Encode(message, base::Bind(&SaveResult, &encoded_message));
EXPECT_NE(message, encoded_message);
std::string decoded_message;
secure_context2.Decode(encoded_message,
base::Bind(&SaveResult, &decoded_message));
EXPECT_EQ(message, decoded_message);
}
}
TEST_F(ProximityAuthDeviceToDeviceSecureContextTest,
DecodeInvalidSequenceNumber) {
// Initialize second secure channel with the same parameters as the first.
DeviceToDeviceSecureContext secure_context2(
std::make_unique<FakeSecureMessageDelegate>(),
InvertedSessionKeys(kSymmetricKey), kResponderAuthMessage,
kProtocolVersion);
// Send a few messages over the first secure context.
std::string message = "encrypt this message";
std::string encoded1;
for (int i = 0; i < 3; ++i) {
secure_context_.Encode(message, base::Bind(&SaveResult, &encoded1));
}
// Second secure channel should not decode the message with an invalid
// sequence number.
std::string decoded_message = "not empty";
secure_context_.Decode(encoded1, base::Bind(&SaveResult, &decoded_message));
EXPECT_TRUE(decoded_message.empty());
}
} // cryptauth
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