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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "crypto/user_verifying_key.h"
#include <iterator>
#include <memory>
#include <LocalAuthentication/LocalAuthentication.h>
#include "base/functional/bind.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/test/bind.h"
#include "base/test/task_environment.h"
#include "crypto/fake_apple_keychain_v2.h"
#include "crypto/scoped_fake_apple_keychain_v2.h"
#include "crypto/scoped_lacontext.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace crypto {
namespace {
constexpr char kTestKeychainAccessGroup[] = "test-keychain-access-group";
constexpr SignatureVerifier::SignatureAlgorithm kAcceptableAlgos[] = {
SignatureVerifier::ECDSA_SHA256};
UserVerifyingKeyProvider::Config MakeConfig() {
UserVerifyingKeyProvider::Config config;
config.keychain_access_group = kTestKeychainAccessGroup;
return config;
}
class UserVerifyingKeyMacTest : public testing::Test {
public:
std::unique_ptr<UserVerifyingSigningKey> GenerateUserVerifyingSigningKey() {
std::unique_ptr<UserVerifyingSigningKey> key;
base::RunLoop run_loop;
provider_->GenerateUserVerifyingSigningKey(
kAcceptableAlgos,
base::BindLambdaForTesting(
[&](base::expected<std::unique_ptr<UserVerifyingSigningKey>,
UserVerifyingKeyCreationError> result) {
if (result.has_value()) {
key = std::move(result.value());
}
run_loop.Quit();
}));
run_loop.Run();
return key;
}
std::unique_ptr<UserVerifyingSigningKey> GetUserVerifyingSigningKey(
std::string key_label) {
std::unique_ptr<UserVerifyingSigningKey> key;
base::RunLoop run_loop;
provider_->GetUserVerifyingSigningKey(
key_label,
base::BindLambdaForTesting(
[&](base::expected<std::unique_ptr<UserVerifyingSigningKey>,
UserVerifyingKeyCreationError> result) {
if (result.has_value()) {
key = std::move(result.value());
}
run_loop.Quit();
}));
run_loop.Run();
return key;
}
bool DeleteUserVerifyingKey(std::string key_label) {
std::optional<bool> deleted;
base::RunLoop run_loop;
provider_->DeleteUserVerifyingKey(
key_label, base::BindLambdaForTesting([&](bool result) {
deleted = result;
run_loop.Quit();
}));
run_loop.Run();
return *deleted;
}
std::optional<std::vector<uint8_t>> Sign(UserVerifyingSigningKey* key,
base::span<const uint8_t> message) {
std::optional<std::vector<uint8_t>> signature;
base::RunLoop run_loop;
key->Sign(message,
base::BindLambdaForTesting(
[&](base::expected<std::vector<uint8_t>,
UserVerifyingKeySigningError> result) {
if (result.has_value()) {
signature = std::move(result.value());
}
run_loop.Quit();
}));
run_loop.Run();
return signature;
}
protected:
ScopedFakeAppleKeychainV2 scoped_fake_apple_keychain_{
kTestKeychainAccessGroup};
base::test::TaskEnvironment task_environment_;
std::unique_ptr<UserVerifyingKeyProvider> provider_ =
crypto::GetUserVerifyingKeyProvider(MakeConfig());
};
TEST_F(UserVerifyingKeyMacTest, RoundTrip) {
for (bool use_lacontext : {false, true}) {
SCOPED_TRACE(use_lacontext);
UserVerifyingKeyProvider::Config config = MakeConfig();
if (use_lacontext) {
config.lacontext = ScopedLAContext([[LAContext alloc] init]);
}
provider_ = crypto::GetUserVerifyingKeyProvider(std::move(config));
std::unique_ptr<UserVerifyingSigningKey> key =
GenerateUserVerifyingSigningKey();
ASSERT_TRUE(key);
ASSERT_TRUE(!key->GetKeyLabel().empty());
const std::vector<uint8_t> spki = key->GetPublicKey();
const uint8_t message[] = {1, 2, 3, 4};
std::optional<std::vector<uint8_t>> signature = Sign(key.get(), message);
ASSERT_TRUE(signature);
crypto::SignatureVerifier verifier;
ASSERT_TRUE(verifier.VerifyInit(kAcceptableAlgos[0], *signature, spki));
verifier.VerifyUpdate(message);
ASSERT_TRUE(verifier.VerifyFinal());
std::unique_ptr<UserVerifyingSigningKey> key2 =
GetUserVerifyingSigningKey(key->GetKeyLabel());
ASSERT_TRUE(key2);
std::optional<std::vector<uint8_t>> signature2 = Sign(key.get(), message);
ASSERT_TRUE(signature2);
crypto::SignatureVerifier verifier2;
ASSERT_TRUE(verifier2.VerifyInit(kAcceptableAlgos[0], *signature2, spki));
verifier2.VerifyUpdate(message);
ASSERT_TRUE(verifier2.VerifyFinal());
}
}
TEST_F(UserVerifyingKeyMacTest, SecureEnclaveAvailability) {
using UVMethod = FakeAppleKeychainV2::UVMethod;
struct {
bool enclave_available;
UVMethod uv_method;
bool expected_uvk_available;
} kTests[] = {
{false, UVMethod::kNone, false},
{false, UVMethod::kPasswordOnly, false},
{false, UVMethod::kBiometrics, false},
{true, UVMethod::kNone, false},
{true, UVMethod::kPasswordOnly, true},
{true, UVMethod::kBiometrics, true},
};
for (auto test : kTests) {
SCOPED_TRACE(test.enclave_available);
SCOPED_TRACE(static_cast<int>(test.uv_method));
scoped_fake_apple_keychain_.keychain()->set_secure_enclave_available(
test.enclave_available);
scoped_fake_apple_keychain_.keychain()->set_uv_method(test.uv_method);
std::optional<bool> result;
base::RunLoop run_loop;
AreUserVerifyingKeysSupported(MakeConfig(),
base::BindLambdaForTesting([&](bool ret) {
result = ret;
run_loop.Quit();
}));
run_loop.Run();
EXPECT_EQ(result.value(), test.expected_uvk_available);
}
}
TEST_F(UserVerifyingKeyMacTest, DeleteSigningKey) {
std::unique_ptr<UserVerifyingSigningKey> key =
GenerateUserVerifyingSigningKey();
ASSERT_TRUE(key);
EXPECT_TRUE(DeleteUserVerifyingKey(key->GetKeyLabel()));
EXPECT_FALSE(GetUserVerifyingSigningKey(key->GetKeyLabel()));
EXPECT_FALSE(DeleteUserVerifyingKey(key->GetKeyLabel()));
}
} // namespace
} // namespace crypto
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