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
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// 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.
#include "components/update_client/utils.h"
#include <stddef.h>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <memory>
#include <utility>
#include "base/callback.h"
#include "base/containers/cxx20_erase.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/memory_mapped_file.h"
#include "base/json/json_file_value_serializer.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_piece.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "components/crx_file/id_util.h"
#include "components/update_client/component.h"
#include "components/update_client/configurator.h"
#include "components/update_client/network.h"
#include "components/update_client/update_client.h"
#include "components/update_client/update_client_errors.h"
#include "crypto/secure_hash.h"
#include "crypto/sha2.h"
#include "url/gurl.h"
namespace update_client {
bool HasDiffUpdate(const Component& component) {
return !component.crx_diffurls().empty();
}
bool IsHttpServerError(int status_code) {
return 500 <= status_code && status_code < 600;
}
bool DeleteFileAndEmptyParentDirectory(const base::FilePath& filepath) {
if (!base::DeleteFile(filepath))
return false;
const base::FilePath dirname(filepath.DirName());
if (!base::IsDirectoryEmpty(dirname))
return true;
return base::DeleteFile(dirname);
}
std::string GetCrxComponentID(const CrxComponent& component) {
return component.app_id.empty() ? GetCrxIdFromPublicKeyHash(component.pk_hash)
: component.app_id;
}
std::string GetCrxIdFromPublicKeyHash(const std::vector<uint8_t>& pk_hash) {
const std::string result =
crx_file::id_util::GenerateIdFromHash(&pk_hash[0], pk_hash.size());
DCHECK(crx_file::id_util::IdIsValid(result));
return result;
}
bool VerifyFileHash256(const base::FilePath& filepath,
const std::string& expected_hash_str) {
std::vector<uint8_t> expected_hash;
if (!base::HexStringToBytes(expected_hash_str, &expected_hash) ||
expected_hash.size() != crypto::kSHA256Length) {
return false;
}
std::unique_ptr<crypto::SecureHash> hasher(
crypto::SecureHash::Create(crypto::SecureHash::SHA256));
int64_t file_size = 0;
if (!base::GetFileSize(filepath, &file_size))
return false;
if (file_size > 0) {
base::MemoryMappedFile mmfile;
if (!mmfile.Initialize(filepath))
return false;
hasher->Update(mmfile.data(), mmfile.length());
}
uint8_t actual_hash[crypto::kSHA256Length] = {0};
hasher->Finish(actual_hash, sizeof(actual_hash));
return memcmp(actual_hash, &expected_hash[0], sizeof(actual_hash)) == 0;
}
bool IsValidBrand(const std::string& brand) {
const size_t kMaxBrandSize = 4;
if (!brand.empty() && brand.size() != kMaxBrandSize)
return false;
return std::find_if_not(brand.begin(), brand.end(), [](char ch) {
return base::IsAsciiAlpha(ch);
}) == brand.end();
}
// Helper function.
// Returns true if |part| matches the expression
// ^[<special_chars>a-zA-Z0-9]{min_length,max_length}$
bool IsValidInstallerAttributePart(const std::string& part,
const std::string& special_chars,
size_t min_length,
size_t max_length) {
if (part.size() < min_length || part.size() > max_length)
return false;
return std::find_if_not(part.begin(), part.end(), [&special_chars](char ch) {
if (base::IsAsciiAlpha(ch) || base::IsAsciiDigit(ch))
return true;
for (auto c : special_chars) {
if (c == ch)
return true;
}
return false;
}) == part.end();
}
// Returns true if the |name| parameter matches ^[-_a-zA-Z0-9]{1,256}$ .
bool IsValidInstallerAttributeName(const std::string& name) {
return IsValidInstallerAttributePart(name, "-_", 1, 256);
}
// Returns true if the |value| parameter matches ^[-.,;+_=$a-zA-Z0-9]{0,256}$ .
bool IsValidInstallerAttributeValue(const std::string& value) {
return IsValidInstallerAttributePart(value, "-.,;+_=$", 0, 256);
}
bool IsValidInstallerAttribute(const InstallerAttribute& attr) {
return IsValidInstallerAttributeName(attr.first) &&
IsValidInstallerAttributeValue(attr.second);
}
void RemoveUnsecureUrls(std::vector<GURL>* urls) {
DCHECK(urls);
base::EraseIf(*urls,
[](const GURL& url) { return !url.SchemeIsCryptographic(); });
}
CrxInstaller::Result InstallFunctionWrapper(
base::OnceCallback<bool()> callback) {
return CrxInstaller::Result(std::move(callback).Run()
? InstallError::NONE
: InstallError::GENERIC_ERROR);
}
// TODO(cpu): add a specific attribute check to a component json that the
// extension unpacker will reject, so that a component cannot be installed
// as an extension.
base::Value ReadManifest(const base::FilePath& unpack_path) {
base::FilePath manifest =
unpack_path.Append(FILE_PATH_LITERAL("manifest.json"));
if (!base::PathExists(manifest))
return base::Value();
JSONFileValueDeserializer deserializer(manifest);
std::string error;
std::unique_ptr<base::Value> root = deserializer.Deserialize(nullptr, &error);
if (!root)
return base::Value();
return base::Value::FromUniquePtrValue(std::move(root));
}
} // namespace update_client
|
