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// 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.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "components/update_client/utils.h"
#include <stddef.h>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <memory>
#include <optional>
#include <utility>
#include <vector>
#include "base/check.h"
#include "base/containers/contains.h"
#include "base/containers/heap_array.h"
#include "base/containers/span.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/memory_mapped_file.h"
#include "base/functional/callback.h"
#include "base/json/json_file_value_serializer.h"
#include "base/path_service.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/system/sys_info.h"
#include "base/threading/platform_thread.h"
#include "base/threading/scoped_blocking_call.h"
#include "base/time/time.h"
#include "base/values.h"
#include "components/crx_file/id_util.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"
#if BUILDFLAG(IS_WIN)
#include <shlobj.h>
#include "base/win/windows_version.h"
#endif // BUILDFLAG(IS_WIN)
namespace update_client {
const char kArchAmd64[] = "x86_64";
const char kArchIntel[] = "x86";
const char kArchArm64[] = "arm64";
bool IsHttpServerError(int status_code) {
return 500 <= status_code && status_code < 600;
}
bool DeleteFileAndEmptyParentDirectory(const base::FilePath& filepath) {
if (!base::DeleteFile(filepath)) {
return false;
}
return DeleteEmptyDirectory(filepath.DirName());
}
bool DeleteEmptyDirectory(const base::FilePath& dir_path) {
if (!base::IsDirectoryEmpty(dir_path)) {
return true;
}
return base::DeleteFile(dir_path);
}
std::string GetCrxComponentID(const CrxComponent& component) {
return component.app_id.empty() ? GetCrxIdFromPublicKeyHash(component.pk_hash)
: component.app_id;
}
std::string GetCrxIdFromPublicKeyHash(base::span<const uint8_t> pk_hash) {
const std::string result = crx_file::id_util::GenerateIdFromHash(pk_hash);
CHECK(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));
base::File file(filepath, base::File::FLAG_OPEN |
base::File::FLAG_WIN_SEQUENTIAL_SCAN |
base::File::FLAG_READ);
if (!file.IsValid()) {
return false;
}
auto buffer = base::HeapArray<uint8_t>::Uninit(4096);
std::optional<size_t> bytes_read = file.ReadAtCurrentPos(buffer);
while (bytes_read.value_or(0) > 0) {
hasher->Update(buffer.first(*bytes_read));
bytes_read = file.ReadAtCurrentPos(buffer);
}
if (!bytes_read) {
return false;
}
std::array<uint8_t, crypto::kSHA256Length> sha256_hash;
hasher->Finish(sha256_hash);
return base::span(sha256_hash) == base::span(expected_hash);
}
bool IsValidBrand(const std::string& brand) {
const size_t kMaxBrandSize = 4;
return brand.empty() ||
(brand.size() == kMaxBrandSize &&
std::ranges::all_of(brand, &base::IsAsciiAlpha<char>));
}
// 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) {
return part.size() >= min_length && part.size() <= max_length &&
std::ranges::all_of(part, [&special_chars](char ch) {
return base::IsAsciiAlpha(ch) || base::IsAsciiDigit(ch) ||
base::Contains(special_chars, ch);
});
}
// 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) {
CHECK(urls);
std::erase_if(*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);
}
std::optional<base::Value::Dict> ReadManifest(
const base::FilePath& unpack_path) {
base::FilePath manifest =
unpack_path.Append(FILE_PATH_LITERAL("manifest.json"));
if (!base::PathExists(manifest)) {
return std::nullopt;
}
JSONFileValueDeserializer deserializer(manifest);
std::string error;
std::unique_ptr<base::Value> root = deserializer.Deserialize(nullptr, &error);
if (!root || !root->is_dict()) {
return std::nullopt;
}
return std::move(root->GetDict());
}
std::string GetArchitecture() {
#if BUILDFLAG(IS_WIN)
const base::win::OSInfo* os_info = base::win::OSInfo::GetInstance();
return (os_info->IsWowX86OnARM64() || os_info->IsWowAMD64OnARM64())
? kArchArm64
: base::SysInfo().OperatingSystemArchitecture();
#else // BUILDFLAG(IS_WIN)
return base::SysInfo().OperatingSystemArchitecture();
#endif // BUILDFLAG(IS_WIN)
}
bool RetryDeletePathRecursively(const base::FilePath& path) {
return RetryDeletePathRecursivelyCustom(
path, /*tries=*/5,
/*seconds_between_tries=*/base::Seconds(1));
}
bool RetryDeletePathRecursivelyCustom(const base::FilePath& path,
size_t tries,
base::TimeDelta seconds_between_tries) {
base::ScopedBlockingCall scoped_blocking_call(FROM_HERE,
base::BlockingType::WILL_BLOCK);
for (size_t i = 0;;) {
if (base::DeletePathRecursively(path)) {
return true;
}
if (++i >= tries) {
break;
}
base::PlatformThread::Sleep(seconds_between_tries);
}
return false;
}
} // namespace update_client
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