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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.
#ifndef CHROME_BROWSER_UI_ASH_FOCUS_MODE_CERTIFICATE_MANAGER_H_
#define CHROME_BROWSER_UI_ASH_FOCUS_MODE_CERTIFICATE_MANAGER_H_
#include <optional>
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "components/account_id/account_id.h"
namespace ash {
namespace attestation {
class AttestationFlow;
} // namespace attestation
class AttestationClient;
} // namespace ash
// Manages certificates from AttestationService for request signing with a
// Content Protection Certificate.
class CertificateManager {
public:
// An opaque identifier for certificates to ensure that certificate from
// `GetCertificate()` can be used for `Sign()`.
struct Key {
explicit Key(const std::string& label, base::Time expiration);
Key(const Key&);
bool operator==(const Key&);
// Name of the certificate in attestationd. Used to lookup the key for
// future signing requests.
const std::string label;
// The expiration time of the certificate. Certificates should be renewed
// before they expire or they can be rejected by the server.
const base::Time expiration;
};
enum class CertificateResult {
kSuccess,
kDisallowedByPolicy,
kInvalidKey,
kCertificateExpired
};
// `expiration_buffer` defines the time allowed before a certificate is
// considered expired. If a certificate expires in less than
// `expiration_buffer`, a new certificate will be retrieved. Otherwise, the
// cached certificate will be provided.
static std::unique_ptr<CertificateManager> Create(
const AccountId& account_id,
base::TimeDelta expiration_buffer);
// Create a `CertificateManager` for testing where dependencies can be
// replaced with fakes.
static std::unique_ptr<CertificateManager> CreateForTesting(
const AccountId& account_id,
base::TimeDelta expiration_buffer,
std::unique_ptr<ash::attestation::AttestationFlow> attestation_flow,
ash::AttestationClient* attestation_client);
CertificateManager() = default;
CertificateManager(const CertificateManager&) = delete;
CertificateManager& operator=(const CertificateManager&) = delete;
virtual ~CertificateManager() = default;
// Attempts to retrieve a certificate via the attestation service. If
// successful, returns an identifier for use with `Sign()`. If a previously
// retrieved certificate is still valid, a new certificate will not be
// retrieved.
using CertificateCallback = base::OnceCallback<void(
const std::optional<CertificateManager::Key>& certificate_key)>;
virtual bool GetCertificate(bool force_update,
CertificateCallback callback) = 0;
// Uses a previously obtained certificate that matches `certificate_key` to
// sign `data`. Returns the signature for `data` as well as the certificates.
// Returns false if the certificate is expired or signing is not supported on
// the device.
using SigningCallback = base::OnceCallback<void(
bool success,
const std::string& signature,
const std::string& client_certificate,
const std::vector<std::string>& intermediate_certificates)>;
virtual CertificateResult Sign(const CertificateManager::Key& certificate_key,
std::string_view data,
SigningCallback callback) = 0;
};
#endif // CHROME_BROWSER_UI_ASH_FOCUS_MODE_CERTIFICATE_MANAGER_H_
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