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| 1 // Copyright (c) 2011 The Chromium 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 #ifndef CHROME_BROWSER_POLICY_CLOUD_POLICY_CACHE_H_ |
| 6 #define CHROME_BROWSER_POLICY_CLOUD_POLICY_CACHE_H_ |
| 7 |
| 8 #include <string> |
| 9 |
| 10 #include "base/file_path.h" |
| 11 #include "base/gtest_prod_util.h" |
| 12 #include "base/ref_counted.h" |
| 13 #include "base/scoped_ptr.h" |
| 14 #include "base/synchronization/lock.h" |
| 15 #include "base/time.h" |
| 16 #include "chrome/browser/policy/configuration_policy_provider.h" |
| 17 #include "chrome/browser/policy/proto/device_management_backend.pb.h" |
| 18 #include "policy/configuration_policy_type.h" |
| 19 |
| 20 class DictionaryValue; |
| 21 class ListValue; |
| 22 class Value; |
| 23 |
| 24 using google::protobuf::RepeatedPtrField; |
| 25 |
| 26 namespace policy { |
| 27 |
| 28 namespace em = enterprise_management; |
| 29 |
| 30 // Decodes a CloudPolicySettings object into two maps with mandatory and |
| 31 // recommended settings, respectively. The implementation is generated code |
| 32 // in policy/cloud_policy_generated.cc. |
| 33 void DecodePolicy(const em::CloudPolicySettings& policy, |
| 34 ConfigurationPolicyProvider::PolicyMapType* mandatory, |
| 35 ConfigurationPolicyProvider::PolicyMapType* recommended); |
| 36 |
| 37 // Keeps the authoritative copy of cloud policy information as read from the |
| 38 // persistence file or determined by the policy backend. The cache doesn't talk |
| 39 // to the service directly, but receives updated policy information through |
| 40 // SetPolicy() calls, which is then persisted and decoded into the internal |
| 41 // Value representation chrome uses. |
| 42 class CloudPolicyCache { |
| 43 public: |
| 44 typedef ConfigurationPolicyProvider::PolicyMapType PolicyMapType; |
| 45 |
| 46 explicit CloudPolicyCache(const FilePath& backing_file_path); |
| 47 ~CloudPolicyCache(); |
| 48 |
| 49 // Loads policy information from the backing file. Non-existing or erroneous |
| 50 // cache files are ignored. |
| 51 void LoadPolicyFromFile(); |
| 52 |
| 53 // Resets the policy information. Returns true if the new policy is different |
| 54 // from the previously stored policy. |
| 55 bool SetPolicy(const em::CloudPolicyResponse& policy); |
| 56 bool SetDevicePolicy(const em::DevicePolicyResponse& policy); |
| 57 |
| 58 // Gets the policy information. Ownership of the return value is transferred |
| 59 // to the caller. |
| 60 DictionaryValue* GetDevicePolicy(); |
| 61 const PolicyMapType* GetMandatoryPolicy() const; |
| 62 const PolicyMapType* GetRecommendedPolicy() const; |
| 63 |
| 64 void SetUnmanaged(); |
| 65 bool is_unmanaged() const { |
| 66 return is_unmanaged_; |
| 67 } |
| 68 |
| 69 // Returns the time at which the policy was last fetched. |
| 70 base::Time last_policy_refresh_time() const { |
| 71 return last_policy_refresh_time_; |
| 72 } |
| 73 |
| 74 // Returns true if this cache holds (old-style) device policy that should be |
| 75 // given preference over (new-style) mandatory/recommended policy. |
| 76 bool has_device_policy() const { |
| 77 return has_device_policy_; |
| 78 } |
| 79 |
| 80 private: |
| 81 friend class CloudPolicyCacheTest; |
| 82 friend class DeviceManagementPolicyCacheDecodeTest; |
| 83 |
| 84 // Decodes a CloudPolicyResponse into two (ConfigurationPolicyType -> Value*) |
| 85 // maps and a timestamp. Also performs verification, returns NULL if any |
| 86 // check fails. |
| 87 static bool DecodePolicyResponse( |
| 88 const em::CloudPolicyResponse& policy_response, |
| 89 PolicyMapType* mandatory, |
| 90 PolicyMapType* recommended, |
| 91 base::Time* timestamp); |
| 92 |
| 93 // Returns true if |certificate_chain| is trusted and a |signature| created |
| 94 // from it matches |data|. |
| 95 static bool VerifySignature( |
| 96 const std::string& signature, |
| 97 const std::string& data, |
| 98 const RepeatedPtrField<std::string>& certificate_chain); |
| 99 |
| 100 // Returns true if |a| equals |b|. |
| 101 static bool Equals(const PolicyMapType& a, const PolicyMapType& b); |
| 102 // Helper function for the above. |
| 103 static bool MapEntryEquals(const PolicyMapType::value_type& a, |
| 104 const PolicyMapType::value_type& b); |
| 105 |
| 106 // Decodes an int64 value. Checks whether the passed value fits the numeric |
| 107 // limits of the value representation. Returns a value (ownership is |
| 108 // transferred to the caller) on success, NULL on failure. |
| 109 static Value* DecodeIntegerValue(google::protobuf::int64 value); |
| 110 |
| 111 // Decode a GenericValue message to the Value representation used internally. |
| 112 // Returns NULL if |value| is invalid (i.e. contains no actual value). |
| 113 static Value* DecodeValue(const em::GenericValue& value); |
| 114 |
| 115 // Decodes a policy message and returns it in Value representation. Ownership |
| 116 // of the returned dictionary is transferred to the caller. |
| 117 static DictionaryValue* DecodeDevicePolicy( |
| 118 const em::DevicePolicyResponse& response); |
| 119 |
| 120 // The file in which we store a cached version of the policy information. |
| 121 const FilePath backing_file_path_; |
| 122 |
| 123 // Protects both |mandatory_policy_| and |recommended_policy_| as well as |
| 124 // |device_policy_|. |
| 125 base::Lock lock_; |
| 126 |
| 127 // Policy key-value information. |
| 128 PolicyMapType mandatory_policy_; |
| 129 PolicyMapType recommended_policy_; |
| 130 scoped_ptr<DictionaryValue> device_policy_; |
| 131 |
| 132 // Tracks whether the store received a SetPolicy() call, which overrides any |
| 133 // information loaded from the file. |
| 134 bool fresh_policy_; |
| 135 |
| 136 bool is_unmanaged_; |
| 137 |
| 138 // Tracks whether the cache currently stores |device_policy_| that should be |
| 139 // given preference over |mandatory_policy_| and |recommended_policy_|. |
| 140 bool has_device_policy_; |
| 141 |
| 142 // The time at which the policy was last refreshed. |
| 143 base::Time last_policy_refresh_time_; |
| 144 }; |
| 145 |
| 146 } // namespace policy |
| 147 |
| 148 #endif // CHROME_BROWSER_POLICY_CLOUD_POLICY_CACHE_H_ |
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