1 // Copyright 2016 The Chromium OS Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "libinstallattributes.h" 6 7 #include <base/files/file_util.h> 8 #include <base/logging.h> 9 10 #include "bindings/install_attributes.pb.h" 11 12 namespace { 13 14 // Written by cryptohome or by lockbox-cache after signature verification and 15 // thus guaranteed to be unadulterated. 16 const char kInstallAttributesPath[] = "/run/lockbox/install_attributes.pb"; 17 18 } // namespace 19 20 // The source of truth for these constants is Chromium 21 // //chrome/browser/chromeos/settings/install_attributes.cc. 22 const char InstallAttributesReader::kAttrMode[] = "enterprise.mode"; 23 const char InstallAttributesReader::kDeviceModeConsumer[] = "consumer"; 24 const char InstallAttributesReader::kDeviceModeEnterprise[] = "enterprise"; 25 const char InstallAttributesReader::kDeviceModeEnterpriseAD[] = "enterprise_ad"; 26 const char InstallAttributesReader::kDeviceModeLegacyRetail[] = "kiosk"; 27 const char InstallAttributesReader::kDeviceModeConsumerKiosk[] = 28 "consumer_kiosk"; 29 InstallAttributesReader()30InstallAttributesReader::InstallAttributesReader() 31 : install_attributes_path_(kInstallAttributesPath) { 32 } 33 ~InstallAttributesReader()34InstallAttributesReader::~InstallAttributesReader() { 35 } 36 GetAttribute(const std::string & key)37const std::string& InstallAttributesReader::GetAttribute( 38 const std::string& key) { 39 // By its very nature of immutable attributes, once read successfully the 40 // attributes can never change and thus never need reloading. 41 if (!initialized_) { 42 TryToLoad(); 43 } 44 45 const auto entry = attributes_.find(key); 46 if (entry == attributes_.end()) { 47 return empty_string_; 48 } 49 return entry->second; 50 } 51 IsLocked()52bool InstallAttributesReader::IsLocked() { 53 if (!initialized_) { 54 TryToLoad(); 55 } 56 return initialized_; 57 } 58 TryToLoad()59void InstallAttributesReader::TryToLoad() { 60 std::string contents; 61 if (!base::ReadFileToString(install_attributes_path_, &contents)) { 62 // May fail during OOBE or early in the boot process. 63 return; 64 } 65 66 // Parse errors are unrecoverable (lockbox does atomic write), thus mark as 67 // inititialized already before checking for parse errors. 68 initialized_ = true; 69 70 cryptohome::SerializedInstallAttributes install_attributes; 71 if (!install_attributes.ParseFromString(contents)) { 72 LOG(ERROR) << "Can't parse install attributes."; 73 return; 74 } 75 76 for (int i = 0; i < install_attributes.attributes_size(); ++i) { 77 const cryptohome::SerializedInstallAttributes_Attribute& attribute = 78 install_attributes.attributes(i); 79 // Cast value to C string and back to remove trailing zero. 80 attributes_[attribute.name()] = std::string(attribute.value().c_str()); 81 } 82 } 83