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
|
// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "extensions/browser/computed_hashes.h"
#include <array>
#include "base/base64.h"
#include "base/files/file_path.h"
#include "base/files/scoped_temp_dir.h"
#include "base/strings/stringprintf.h"
#include "build/build_config.h"
#include "crypto/sha2.h"
#include "extensions/browser/content_verifier/content_verifier_utils.h"
#include "extensions/common/constants.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
constexpr bool kIsFileAccessCaseInsensitive =
!extensions::content_verifier_utils::IsFileAccessCaseSensitive();
struct HashInfo {
base::FilePath path;
int block_size;
std::vector<std::string> hashes;
};
testing::AssertionResult WriteThenReadComputedHashes(
const std::vector<HashInfo>& hash_infos,
extensions::ComputedHashes* result) {
base::ScopedTempDir scoped_dir;
if (!scoped_dir.CreateUniqueTempDir()) {
return testing::AssertionFailure() << "Failed to create temp dir.";
}
base::FilePath computed_hashes_path =
scoped_dir.GetPath().AppendASCII("computed_hashes.json");
extensions::ComputedHashes::Data computed_hashes_data;
for (const auto& info : hash_infos)
computed_hashes_data.Add(info.path, info.block_size, info.hashes);
if (!extensions::ComputedHashes(std::move(computed_hashes_data))
.WriteToFile(computed_hashes_path)) {
return testing::AssertionFailure()
<< "Failed to write computed_hashes.json";
}
extensions::ComputedHashes::Status computed_hashes_status;
std::optional<extensions::ComputedHashes> computed_hashes =
extensions::ComputedHashes::CreateFromFile(computed_hashes_path,
&computed_hashes_status);
if (!computed_hashes) {
return testing::AssertionFailure()
<< "Failed to read computed_hashes.json (status: "
<< static_cast<int>(computed_hashes_status) << ")";
}
*result = std::move(computed_hashes.value());
return testing::AssertionSuccess();
}
} // namespace
namespace extensions {
TEST(ComputedHashesTest, ComputedHashes) {
// We'll add hashes for 2 files, one of which uses a subdirectory
// path. The first file will have a list of 1 block hash, and the
// second file will have 2 block hashes.
base::FilePath path1(FILE_PATH_LITERAL("foo.txt"));
base::FilePath path2 =
base::FilePath(FILE_PATH_LITERAL("foo")).AppendASCII("bar.txt");
std::vector<std::string> hashes1 = {crypto::SHA256HashString("first")};
std::vector<std::string> hashes2 = {crypto::SHA256HashString("second"),
crypto::SHA256HashString("third")};
const int kBlockSize1 = 4096;
const int kBlockSize2 = 2048;
ComputedHashes computed_hashes{ComputedHashes::Data()};
ASSERT_TRUE(WriteThenReadComputedHashes(
{{path1, kBlockSize1, hashes1}, {path2, kBlockSize2, hashes2}},
&computed_hashes));
// After reading hashes back assert that we got what we wrote.
std::vector<std::string> read_hashes1;
std::vector<std::string> read_hashes2;
int block_size = 0;
EXPECT_TRUE(computed_hashes.GetHashes(path1, &block_size, &read_hashes1));
EXPECT_EQ(block_size, 4096);
block_size = 0;
EXPECT_TRUE(computed_hashes.GetHashes(path2, &block_size, &read_hashes2));
EXPECT_EQ(block_size, 2048);
EXPECT_EQ(hashes1, read_hashes1);
EXPECT_EQ(hashes2, read_hashes2);
// Make sure we can lookup hashes for a file using incorrect case
base::FilePath path1_badcase(FILE_PATH_LITERAL("FoO.txt"));
std::vector<std::string> read_hashes1_badcase;
EXPECT_EQ(kIsFileAccessCaseInsensitive,
computed_hashes.GetHashes(path1_badcase, &block_size,
&read_hashes1_badcase));
if (kIsFileAccessCaseInsensitive) {
EXPECT_EQ(4096, block_size);
EXPECT_EQ(hashes1, read_hashes1_badcase);
}
// Finally make sure that we can retrieve the hashes for the subdir
// path even when that path contains forward slashes (on windows).
base::FilePath path2_fwd_slashes =
base::FilePath::FromUTF8Unsafe("foo/bar.txt");
block_size = 0;
EXPECT_TRUE(
computed_hashes.GetHashes(path2_fwd_slashes, &block_size, &read_hashes2));
EXPECT_EQ(hashes2, read_hashes2);
}
// Note: the expected hashes used in this test were generated using linux
// command line tools. E.g., from a bash prompt:
// $ printf "hello world" | openssl dgst -sha256 -binary | base64
//
// The file with multiple-blocks expectations were generated by doing:
// $ for i in `seq 500 ; do printf "hello world" ; done > hello.txt
// $ dd if=hello.txt bs=4096 count=1 | openssl dgst -sha256 -binary | base64
// $ dd if=hello.txt skip=1 bs=4096 count=1 |
// openssl dgst -sha256 -binary | base64
TEST(ComputedHashesTest, GetHashesForContent) {
const int block_size = 4096;
// Simple short input.
std::string content1 = "hello world";
std::string content1_expected_hash =
"uU0nuZNNPgilLlLX2n2r+sSE7+N6U4DukIj3rOLvzek=";
std::vector<std::string> hashes1 =
ComputedHashes::GetHashesForContent(content1, block_size);
ASSERT_EQ(1u, hashes1.size());
EXPECT_EQ(content1_expected_hash, base::Base64Encode(hashes1[0]));
// Multiple blocks input.
std::string content2;
for (int i = 0; i < 500; i++)
content2 += "hello world";
auto content2_expected_hashes = std::to_array<const char*>(
{"bvtt5hXo8xvHrlzGAhhoqPL/r+4zJXHx+6wAvkv15V8=",
"lTD45F7P6I/HOdi8u7FLRA4qzAYL+7xSNVeusG6MJI0="});
std::vector<std::string> hashes2 =
ComputedHashes::GetHashesForContent(content2, block_size);
ASSERT_EQ(2u, hashes2.size());
EXPECT_EQ(content2_expected_hashes[0], base::Base64Encode(hashes2[0]));
EXPECT_EQ(content2_expected_hashes[1], base::Base64Encode(hashes2[1]));
// Now an empty input.
std::string content3;
std::vector<std::string> hashes3 =
ComputedHashes::GetHashesForContent(content3, block_size);
ASSERT_EQ(1u, hashes3.size());
ASSERT_EQ(std::string("47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU="),
base::Base64Encode(hashes3[0]));
}
} // namespace extensions
|
