1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
|
// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PREFS_TRACKED_PREF_HASH_STORE_TRANSACTION_H_
#define CHROME_BROWSER_PREFS_TRACKED_PREF_HASH_STORE_TRANSACTION_H_
#include <string>
#include <vector>
namespace base {
class DictionaryValue;
class Value;
} // namespace base
// Used to perform a series of checks/transformations on a PrefHashStore.
class PrefHashStoreTransaction {
public:
enum ValueState {
// The preference value corresponds to its stored hash.
UNCHANGED,
// The preference has been cleared since the last hash.
CLEARED,
// The preference value corresponds to its stored hash, but the hash was
// calculated using a deprecated hash algorithm which is just as safe as
// the current one.
SECURE_LEGACY,
// The preference value has been changed since the last hash.
CHANGED,
// No stored hash exists for the preference value.
UNTRUSTED_UNKNOWN_VALUE,
// No stored hash exists for the preference value, but the current set of
// hashes stored is trusted and thus this value can safely be seeded. This
// happens when all hashes are already properly seeded and a newly
// tracked value needs to be seeded).
TRUSTED_UNKNOWN_VALUE,
// NULL values are inherently trusted.
TRUSTED_NULL_VALUE,
};
// Finalizes any remaining work after the transaction has been performed.
virtual ~PrefHashStoreTransaction() {}
// Checks |initial_value| against the existing stored value hash.
virtual ValueState CheckValue(
const std::string& path, const base::Value* initial_value) const = 0;
// Stores a hash of the current |value| of the preference at |path|.
virtual void StoreHash(const std::string& path,
const base::Value* value) = 0;
// Checks |initial_value| against the existing stored hashes for the split
// preference at |path|. |initial_split_value| being an empty dictionary or
// NULL is equivalent. |invalid_keys| must initially be empty. |invalid_keys|
// will not be modified unless the return value is CHANGED, in which case it
// will be filled with the keys that are considered invalid (unknown or
// changed).
virtual ValueState CheckSplitValue(
const std::string& path,
const base::DictionaryValue* initial_split_value,
std::vector<std::string>* invalid_keys) const = 0;
// Stores hashes for the |value| of the split preference at |path|.
// |split_value| being an empty dictionary or NULL is equivalent.
virtual void StoreSplitHash(
const std::string& path,
const base::DictionaryValue* split_value) = 0;
// Indicates whether the store contains a hash for the preference at |path|.
virtual bool HasHash(const std::string& path) const = 0;
// Sets the hash for the preference at |path|.
// If |path| is a split preference |hash| must be a DictionaryValue whose
// keys are keys in the split preference and whose values are MACs of the
// corresponding values in the split preference.
// If |path| is an atomic preference |hash| must be a StringValue
// containing a MAC of the preference value.
// |hash| should originate from a PrefHashStore sharing the same MAC
// parameters as this transaction's store.
// The (in)validity of the super MAC will be maintained by this call.
virtual void ImportHash(const std::string& path, const base::Value* hash) = 0;
// Removes the hash stored at |path|. The (in)validity of the super MAC will
// be maintained by this call.
virtual void ClearHash(const std::string& path) = 0;
// Indicates whether the super MAC was successfully verified at the beginning
// of this transaction.
virtual bool IsSuperMACValid() const = 0;
// Forces a valid super MAC to be stored when this transaction terminates.
// Returns true if this results in a change to the store contents.
virtual bool StampSuperMac() = 0;
};
#endif // CHROME_BROWSER_PREFS_TRACKED_PREF_HASH_STORE_TRANSACTION_H_
|
