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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/scoped_fake_user_verifying_key_provider.h"
#include <memory>
#include <utility>
#include <vector>
#include "base/base64.h"
#include "base/containers/flat_map.h"
#include "base/containers/span.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "crypto/signature_verifier.h"
#include "crypto/unexportable_key.h"
#include "crypto/user_verifying_key.h"
namespace crypto {
namespace {
// This tracks deleted keys, so calling `DeleteUserVerifyingKey` with one
// can return false, allowing deletion to be tested.
std::vector<UserVerifyingKeyLabel> g_deleted_keys_;
// When true, fake UV signing keys indicate that they are hardware backed.
bool g_fake_hardware_backing_ = false;
// Wraps a software `UnexportableSigningKey`.
class FakeUserVerifyingSigningKey : public UserVerifyingSigningKey {
public:
FakeUserVerifyingSigningKey(
UserVerifyingKeyLabel label,
std::unique_ptr<UnexportableSigningKey> software_key)
: label_(std::move(label)), software_key_(std::move(software_key)) {}
~FakeUserVerifyingSigningKey() override = default;
void Sign(base::span<const uint8_t> data,
UserVerifyingKeySignatureCallback callback) override {
auto opt_signature = software_key_->SignSlowly(data);
if (!opt_signature.has_value()) {
std::move(callback).Run(
base::unexpected(UserVerifyingKeySigningError::kUnknownError));
return;
}
std::move(callback).Run(base::ok(*opt_signature));
}
std::vector<uint8_t> GetPublicKey() const override {
return software_key_->GetSubjectPublicKeyInfo();
}
const UserVerifyingKeyLabel& GetKeyLabel() const override { return label_; }
bool IsHardwareBacked() const override { return g_fake_hardware_backing_; }
private:
const UserVerifyingKeyLabel label_;
std::unique_ptr<UnexportableSigningKey> software_key_;
};
class FakeUserVerifyingKeyProvider : public UserVerifyingKeyProvider {
public:
~FakeUserVerifyingKeyProvider() override = default;
void GenerateUserVerifyingSigningKey(
base::span<const SignatureVerifier::SignatureAlgorithm>
acceptable_algorithms,
UserVerifyingKeyCreationCallback callback) override {
auto software_unexportable_key =
GetSoftwareUnsecureUnexportableKeyProvider()->GenerateSigningKeySlowly(
acceptable_algorithms);
UserVerifyingKeyLabel key_label =
base::Base64Encode(software_unexportable_key->GetWrappedKey());
std::move(callback).Run(std::make_unique<FakeUserVerifyingSigningKey>(
std::move(key_label), std::move(software_unexportable_key)));
}
void GetUserVerifyingSigningKey(
UserVerifyingKeyLabel key_label,
UserVerifyingKeyCreationCallback callback) override {
for (auto deleted_key : g_deleted_keys_) {
if (deleted_key == key_label) {
std::move(callback).Run(
base::unexpected(UserVerifyingKeyCreationError::kUnknownError));
return;
}
}
std::vector<SignatureVerifier::SignatureAlgorithm> algorithms = {
SignatureVerifier::SignatureAlgorithm::ECDSA_SHA256};
std::optional<std::vector<uint8_t>> wrapped_key =
base::Base64Decode(key_label);
CHECK(wrapped_key);
auto software_unexportable_key =
GetSoftwareUnsecureUnexportableKeyProvider()
->FromWrappedSigningKeySlowly(*wrapped_key);
CHECK(software_unexportable_key);
std::move(callback).Run(
base::ok(std::make_unique<FakeUserVerifyingSigningKey>(
std::move(key_label), std::move(software_unexportable_key))));
}
void DeleteUserVerifyingKey(
UserVerifyingKeyLabel key_label,
base::OnceCallback<void(bool)> callback) override {
g_deleted_keys_.push_back(key_label);
std::move(callback).Run(true);
}
};
class FailingUserVerifyingSigningKey : public UserVerifyingSigningKey {
public:
FailingUserVerifyingSigningKey() : label_("test") {}
~FailingUserVerifyingSigningKey() override = default;
void Sign(base::span<const uint8_t> data,
UserVerifyingKeySignatureCallback callback) override {
std::move(callback).Run(
base::unexpected(UserVerifyingKeySigningError::kUnknownError));
}
std::vector<uint8_t> GetPublicKey() const override { return {1, 2, 3, 4}; }
const UserVerifyingKeyLabel& GetKeyLabel() const override { return label_; }
private:
const UserVerifyingKeyLabel label_;
};
class FailingUserVerifyingKeyProvider : public UserVerifyingKeyProvider {
public:
~FailingUserVerifyingKeyProvider() override = default;
void GenerateUserVerifyingSigningKey(
base::span<const SignatureVerifier::SignatureAlgorithm>
acceptable_algorithms,
UserVerifyingKeyCreationCallback callback) override {
std::move(callback).Run(
base::ok(std::make_unique<FailingUserVerifyingSigningKey>()));
}
void GetUserVerifyingSigningKey(
UserVerifyingKeyLabel key_label,
UserVerifyingKeyCreationCallback callback) override {
std::move(callback).Run(
base::ok(std::make_unique<FailingUserVerifyingSigningKey>()));
}
void DeleteUserVerifyingKey(
UserVerifyingKeyLabel key_label,
base::OnceCallback<void(bool)> callback) override {}
};
std::unique_ptr<UserVerifyingKeyProvider> GetMockUserVerifyingKeyProvider() {
return std::make_unique<FakeUserVerifyingKeyProvider>();
}
std::unique_ptr<UserVerifyingKeyProvider> GetNullUserVerifyingKeyProvider() {
return nullptr;
}
std::unique_ptr<UserVerifyingKeyProvider> GetFailingUserVerifyingKeyProvider() {
return std::make_unique<FailingUserVerifyingKeyProvider>();
}
} // namespace
ScopedFakeUserVerifyingKeyProvider::ScopedFakeUserVerifyingKeyProvider(
bool fake_hardware_backing) {
g_fake_hardware_backing_ = fake_hardware_backing;
internal::SetUserVerifyingKeyProviderForTesting(
GetMockUserVerifyingKeyProvider);
}
ScopedFakeUserVerifyingKeyProvider::~ScopedFakeUserVerifyingKeyProvider() {
g_fake_hardware_backing_ = false;
internal::SetUserVerifyingKeyProviderForTesting(nullptr);
}
ScopedNullUserVerifyingKeyProvider::ScopedNullUserVerifyingKeyProvider() {
internal::SetUserVerifyingKeyProviderForTesting(
GetNullUserVerifyingKeyProvider);
}
ScopedNullUserVerifyingKeyProvider::~ScopedNullUserVerifyingKeyProvider() {
internal::SetUserVerifyingKeyProviderForTesting(nullptr);
}
ScopedFailingUserVerifyingKeyProvider::ScopedFailingUserVerifyingKeyProvider() {
internal::SetUserVerifyingKeyProviderForTesting(
GetFailingUserVerifyingKeyProvider);
}
ScopedFailingUserVerifyingKeyProvider::
~ScopedFailingUserVerifyingKeyProvider() {
internal::SetUserVerifyingKeyProviderForTesting(nullptr);
}
} // namespace crypto
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