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67 lines
2.5 KiB
67 lines
2.5 KiB
4 months ago
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// Copyright 2016 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef LIBBRILLO_INSTALL_ATTRIBUTES_LIBINSTALLATTRIBUTES_H_
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#define LIBBRILLO_INSTALL_ATTRIBUTES_LIBINSTALLATTRIBUTES_H_
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#include <map>
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#include <string>
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#include <base/files/file_path.h>
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#include <brillo/brillo_export.h>
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// Simple caching reader for the (verified) install attributes, a TPM-backed
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// write once read many store. Install attributes may be written exactly once
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// by a single, atomic write-and-lock operation encompassing zero or more
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// attributes. Once locked, install attributes cannot be re-written unless TPM
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// is reset (eg. by powerwashing the device).
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class BRILLO_EXPORT InstallAttributesReader {
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public:
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static const char kAttrMode[];
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// Constants for the possible device modes.
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static const char kDeviceModeConsumer[];
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static const char kDeviceModeEnterprise[];
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static const char kDeviceModeEnterpriseAD[];
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static const char kDeviceModeLegacyRetail[];
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static const char kDeviceModeConsumerKiosk[];
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InstallAttributesReader();
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virtual ~InstallAttributesReader();
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// Try to load install attributes (unless cached already) and return the
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// attribute for |key| or an empty string in case |key| doesn't exist or in
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// case install attributes couldn't (yet) be loaded. The latter is expected
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// during OOBE (install attributes haven't yet been finalized) or early in the
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// boot sequence (install attributes haven't yet been verified).
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const std::string& GetAttribute(const std::string& key);
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// Try to load install attributes (unless cached already) and return whether
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// they have yet been written-and-locked.
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bool IsLocked();
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protected:
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// Attributes cache.
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std::map<std::string, std::string> attributes_;
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// Path to the *verified* install attributes file on disk.
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base::FilePath install_attributes_path_;
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// Whether install attributes have been read successfully. Reading a file
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// containing an empty attributes proto indicates consumer mode and counts as
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// successful, too.
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bool initialized_ = false;
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private:
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// Try to load the verified install attributes from disk. This is expected to
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// fail when install attributes haven't yet been finalized (OOBE) or verified
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// (early in the boot sequence).
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void TryToLoad();
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// Empty string to return on error.
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std::string empty_string_;
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};
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#endif // LIBBRILLO_INSTALL_ATTRIBUTES_LIBINSTALLATTRIBUTES_H_
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