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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.
#include "components/metrics/net/net_metrics_log_uploader.h"
#include <sstream>
#include <string_view>
#include "base/base64.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/metrics/histogram_macros.h"
#include "base/metrics/statistics_recorder.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "components/encrypted_messages/encrypted_message.pb.h"
#include "components/encrypted_messages/message_encrypter.h"
#include "components/metrics/metrics_log.h"
#include "components/metrics/metrics_log_uploader.h"
#include "net/base/load_flags.h"
#include "net/base/url_util.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "services/network/public/cpp/simple_url_loader.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/metrics_proto/chrome_user_metrics_extension.pb.h"
#include "third_party/metrics_proto/reporting_info.pb.h"
#include "third_party/zlib/google/compression_utils.h"
#include "url/gurl.h"
namespace {
// Constants used for encrypting logs that are sent over HTTP. The
// corresponding private key is used by the metrics server to decrypt logs.
const char kEncryptedMessageLabel[] = "metrics log";
const uint8_t kServerPublicKey[] = {
0x51, 0xcc, 0x52, 0x67, 0x42, 0x47, 0x3b, 0x10, 0xe8, 0x63, 0x18,
0x3c, 0x61, 0xa7, 0x96, 0x76, 0x86, 0x91, 0x40, 0x71, 0x39, 0x5f,
0x31, 0x1a, 0x39, 0x5b, 0x76, 0xb1, 0x6b, 0x3d, 0x6a, 0x2b};
const uint32_t kServerPublicKeyVersion = 1;
constexpr char kNoUploadUrlsReasonMsg[] =
"No server upload URLs specified. Will not attempt to retransmit.";
net::NetworkTrafficAnnotationTag GetNetworkTrafficAnnotation(
const metrics::MetricsLogUploader::MetricServiceType& service_type,
const metrics::LogMetadata& log_metadata) {
// The code in this function should remain so that we won't need a default
// case that does not have meaningful annotation.
// Structured Metrics is an UMA consented metric service.
if (service_type == metrics::MetricsLogUploader::UMA ||
service_type == metrics::MetricsLogUploader::STRUCTURED_METRICS) {
return net::DefineNetworkTrafficAnnotation("metrics_report_uma", R"(
semantics {
sender: "Metrics UMA Log Uploader"
description:
"Report of usage statistics and crash-related data about Chrome. "
"Usage statistics contain information such as preferences, button "
"clicks, and memory usage and do not include web page URLs or "
"personal information. See more at "
"https://www.google.com/chrome/browser/privacy/ under 'Usage "
"statistics and crash reports'. Usage statistics are tied to a "
"pseudonymous machine identifier and not to your email address."
trigger:
"Reports are automatically generated on startup and at intervals "
"while Chrome is running."
data:
"A protocol buffer with usage statistics and crash related data."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2024-02-15"
user_data {
type: BIRTH_DATE
type: GENDER
type: HW_OS_INFO
type: USAGE_AND_PERFORMANCE_METRICS
type: OTHER
}
internal {
contacts {
owners: "//components/metrics/OWNERS"
}
}
}
policy {
cookies_allowed: NO
setting:
"Users can enable or disable this feature via "
"\"Help improve Chrome's features and performance\" in Chrome "
"settings under Sync and Google services > Other Google services. "
"The feature is enabled by default."
chrome_policy {
MetricsReportingEnabled {
policy_options {mode: MANDATORY}
MetricsReportingEnabled: false
}
}
})");
}
if (service_type == metrics::MetricsLogUploader::DWA) {
return net::DefineNetworkTrafficAnnotation("metrics_report_dwa", R"(
semantics {
sender: "Metrics DWA Log Uploader"
description:
"Report of usage statistics that are keyed by a third-party domain "
"to Google. These reports contains only DWA data. This includes "
"information about the web pages you visit and your usage of them, "
"such as API usage. The third-party domain used as a key could be, "
"for instance, an inline frame or script owner. Usage statistics "
"are sent with an ephemeral pseudonymous identifier."
trigger:
"Reports are automatically generated on startup and at intervals "
"while Chrome is running with usage statistics and 'Make searches "
"and browsing better' settings enabled."
data:
"Usage statistics and associated third-party domains are collected."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2025-02-10"
user_data {
type: HW_OS_INFO
type: SENSITIVE_URL
type: USAGE_AND_PERFORMANCE_METRICS
type: OTHER
}
internal {
contacts {
owners: "//components/metrics/OWNERS"
}
}
}
policy {
cookies_allowed: NO
setting:
"Users can enable or disable this feature by disabling 'Make "
"searches and browsing better' in Chrome's settings under Advanced "
"Settings, Privacy. This has to be enabled for all active profiles. "
"This is only enabled if the user has 'Help improve Chrome's "
"features and performance enabled in the same settings menu."
chrome_policy {
MetricsReportingEnabled {
policy_options {mode: MANDATORY}
MetricsReportingEnabled: false
}
UrlKeyedAnonymizedDataCollectionEnabled {
policy_options {mode: MANDATORY}
UrlKeyedAnonymizedDataCollectionEnabled: false
}
}
})");
}
DCHECK_EQ(service_type, metrics::MetricsLogUploader::UKM);
if (log_metadata.log_source_type.has_value() &&
log_metadata.log_source_type.value() ==
metrics::UkmLogSourceType::APPKM_ONLY) {
return net::DefineNetworkTrafficAnnotation("metrics_report_appkm", R"(
semantics {
sender: "Metrics AppKM Log Uploader"
description:
"Report of usage statistics that are keyed by App Identifiers to "
"Google. These reports only contain App-Keyed Metrics (AppKMs) "
"records, which are the metrics related to the user interaction with "
"various Apps on ChromeOS devices only. The apps platform includes, "
"but is not limited to, progressive web apps (PWA), Chrome apps, and "
"apps from the various VMs / GuestOS's: Android (ARC++), Linux "
"(Crostini), Windows (Parallels), and Steam (Borealis). Usage "
"statistics are tied to a pseudonymous machine identifier and not to "
"your email address."
trigger:
"Reports are automatically generated on startup and at intervals "
"while Chrome is running with usage statistics and App Sync settings "
"enabled."
data:
"A protocol buffer with usage statistics and associated App Identifiers."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2024-02-15"
user_data {
type: BIRTH_DATE
type: GENDER
type: HW_OS_INFO
type: SENSITIVE_URL
type: USAGE_AND_PERFORMANCE_METRICS
type: OTHER
}
internal {
contacts {
owners: "//components/metrics/OWNERS"
}
}
}
policy {
cookies_allowed: NO
setting:
"Users can enable or disable this feature using App Sync or usage "
"statistics checkbox from the settings. Both are on by default, but "
"can be turned-off by the user."
chrome_policy {
SyncDisabled {
policy_options {mode: MANDATORY}
SyncDisabled: true
}
MetricsReportingEnabled{
policy_options {mode: MANDATORY}
MetricsReportingEnabled: true
}
SyncTypesListDisabled {
SyncTypesListDisabled: {
entries: "apps"
}
}
}
})");
} else if (log_metadata.log_source_type.has_value() &&
log_metadata.log_source_type.value() ==
metrics::UkmLogSourceType::BOTH_UKM_AND_APPKM) {
return net::DefineNetworkTrafficAnnotation("metrics_report_ukm_and_appkm",
R"(
semantics {
sender: "Metrics UKM and AppKM Log Uploader"
description:
"Report of usage statistics that are keyed by URLs to Google. These "
"reports contains both AppKM and UKM data. This includes information "
"about the web pages you visit and your usage of them, such as page "
"load speed. This will also include URLs and statistics related to "
"downloaded files. These statistics may also include information "
"about the extensions that have been installed from Chrome Web "
"Store. Google only stores usage statistics associated with published "
"extensions, and URLs that are known by Google’s search index. Usage "
"statistics are tied to a pseudonymous machine identifier and not to "
"your email address. Note: Reports containing only AppKM data will be "
"reported under 'Metrics AppKM Log Uploader' and only UKM data will "
"be reported under 'Metrics UKM Log Uploader' instead."
trigger:
"Reports are automatically generated on startup and at intervals "
"while Chrome is running with usage statistics, 'Make searches and "
"browsing better' and App Sync settings enabled."
data:
"A protocol buffer with usage statistics and associated URLs."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2024-02-15"
user_data {
type: BIRTH_DATE
type: GENDER
type: HW_OS_INFO
type: SENSITIVE_URL
type: USAGE_AND_PERFORMANCE_METRICS
type: OTHER
}
internal {
contacts {
owners: "//components/metrics/OWNERS"
}
}
}
policy {
cookies_allowed: NO
setting:
"Users can disble this feature by disabling 'Make searches and "
"browsing better' in Chrome's settings under Advanced Settings or "
"disabling App Sync. This is only enabled if the user has 'Help "
"improve Chrome's features and performance' enabled in the same "
"settings menu. Information about the installed extensions is sent "
"only if Extension Sync is enabled."
chrome_policy {
SyncDisabled {
policy_options {mode: MANDATORY}
SyncDisabled: true
}
MetricsReportingEnabled{
policy_options {mode: MANDATORY}
MetricsReportingEnabled: true
}
SyncTypesListDisabled {
SyncTypesListDisabled: {
entries: "apps"
}
}
UrlKeyedAnonymizedDataCollectionEnabled {
policy_options {mode: MANDATORY}
UrlKeyedAnonymizedDataCollectionEnabled: false
}
}
})");
} else {
return net::DefineNetworkTrafficAnnotation("metrics_report_ukm", R"(
semantics {
sender: "Metrics UKM Log Uploader"
description:
"Report of usage statistics that are keyed by URLs to Google. These "
"reports contains only UKM data. This includes information about the "
"web pages you visit and your usage of them, such as page load speed. "
"This will also include URLs and statistics related to downloaded "
"files. These statistics may also include information about the "
"extensions that have been installed from Chrome Web Store. Google "
"only stores usage statistics associated with published extensions, "
"and URLs that are known by Google’s search index. Usage statistics "
"are tied to a pseudonymous machine identifier and not to your email "
"address."
trigger:
"Reports are automatically generated on startup and at intervals "
"while Chrome is running with usage statistics and 'Make searches "
"and browsing better' settings enabled."
data:
"A protocol buffer with usage statistics and associated URLs."
destination: GOOGLE_OWNED_SERVICE
last_reviewed: "2024-02-15"
user_data {
type: BIRTH_DATE
type: GENDER
type: HW_OS_INFO
type: SENSITIVE_URL
type: USAGE_AND_PERFORMANCE_METRICS
type: OTHER
}
internal {
contacts {
owners: "//components/metrics/OWNERS"
}
}
}
policy {
cookies_allowed: NO
setting:
"Users can enable or disable this feature by disabling 'Make "
"searches and browsing better' in Chrome's settings under Advanced "
"Settings, Privacy. This has to be enabled for all active profiles. "
"This is only enabled if the user has 'Help improve Chrome's "
"features and performance' enabled in the same settings menu. "
"Information about the installed extensions is sent only if "
"Extension Sync is enabled."
chrome_policy {
MetricsReportingEnabled {
policy_options {mode: MANDATORY}
MetricsReportingEnabled: false
}
UrlKeyedAnonymizedDataCollectionEnabled {
policy_options {mode: MANDATORY}
UrlKeyedAnonymizedDataCollectionEnabled: false
}
}
})");
}
}
std::string SerializeReportingInfo(
const metrics::ReportingInfo& reporting_info) {
std::string bytes;
bool success = reporting_info.SerializeToString(&bytes);
DCHECK(success);
return base::Base64Encode(bytes);
}
// Encrypts a |plaintext| string, using the encrypted_messages component,
// returns |encrypted| which is a serialized EncryptedMessage object. Returns
// false if there was a problem encrypting.
bool EncryptString(const std::string& plaintext, std::string* encrypted) {
encrypted_messages::EncryptedMessage encrypted_message;
CHECK(encrypted_messages::EncryptSerializedMessage(
kServerPublicKey, kServerPublicKeyVersion, kEncryptedMessageLabel,
plaintext, &encrypted_message)) << "Error encrypting string.";
CHECK(encrypted_message.SerializeToString(encrypted))
<< "Error serializing encrypted string.";
return true;
}
// Encrypts a |plaintext| string and returns |encoded|, which is a base64
// encoded serialized EncryptedMessage object. Returns false if there was a
// problem encrypting or serializing.
bool EncryptAndBase64EncodeString(const std::string& plaintext,
std::string* encoded) {
std::string encrypted_text;
if (!EncryptString(plaintext, &encrypted_text)) {
return false;
}
*encoded = base::Base64Encode(encrypted_text);
return true;
}
#ifndef NDEBUG
void LogUploadingHistograms(const std::string& compressed_log_data) {
if (!VLOG_IS_ON(2)) {
return;
}
std::string uncompressed;
if (!compression::GzipUncompress(compressed_log_data, &uncompressed)) {
DVLOG(2) << "failed to uncompress log";
return;
}
metrics::ChromeUserMetricsExtension proto;
if (!proto.ParseFromString(uncompressed)) {
DVLOG(2) << "failed to parse uncompressed log";
return;
};
DVLOG(2) << "Uploading histograms...";
const base::StatisticsRecorder::Histograms histograms =
base::StatisticsRecorder::GetHistograms();
auto get_histogram_name = [&](uint64_t name_hash) -> std::string {
for (base::HistogramBase* histogram : histograms) {
if (histogram->name_hash() == name_hash) {
return std::string(histogram->histogram_name());
}
}
return base::StrCat({"unnamed ", base::NumberToString(name_hash)});
};
for (int i = 0; i < proto.histogram_event_size(); i++) {
const metrics::HistogramEventProto& event = proto.histogram_event(i);
std::stringstream summary;
summary << " sum=" << event.sum();
for (int j = 0; j < event.bucket_size(); j++) {
const metrics::HistogramEventProto::Bucket& b = event.bucket(j);
// Empty fields have a specific meaning, see
// third_party/metrics_proto/histogram_event.proto.
summary << " bucket["
<< (b.has_min() ? base::NumberToString(b.min()) : "..") << '-'
<< (b.has_max() ? base::NumberToString(b.max()) : "..") << ")="
<< (b.has_count() ? base::NumberToString(b.count()) : "(1)");
}
DVLOG(2) << get_histogram_name(event.name_hash()) << summary.str();
}
}
#endif
} // namespace
namespace metrics {
NetMetricsLogUploader::NetMetricsLogUploader(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
const GURL& server_url,
std::string_view mime_type,
MetricsLogUploader::MetricServiceType service_type,
const MetricsLogUploader::UploadCallback& on_upload_complete)
: NetMetricsLogUploader(url_loader_factory,
server_url,
/*insecure_server_url=*/GURL(),
mime_type,
service_type,
on_upload_complete) {}
NetMetricsLogUploader::NetMetricsLogUploader(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory,
const GURL& server_url,
const GURL& insecure_server_url,
std::string_view mime_type,
MetricsLogUploader::MetricServiceType service_type,
const MetricsLogUploader::UploadCallback& on_upload_complete)
: url_loader_factory_(std::move(url_loader_factory)),
server_url_(server_url),
insecure_server_url_(insecure_server_url),
mime_type_(mime_type.data(), mime_type.size()),
service_type_(service_type),
on_upload_complete_(on_upload_complete) {}
NetMetricsLogUploader::~NetMetricsLogUploader() = default;
void NetMetricsLogUploader::UploadLog(const std::string& compressed_log_data,
const LogMetadata& log_metadata,
const std::string& log_hash,
const std::string& log_signature,
const ReportingInfo& reporting_info) {
// If this attempt is a retry, there was a network error, the last attempt was
// over HTTPS, and there is an insecure URL set, then attempt this upload over
// HTTP.
if (reporting_info.attempt_count() > 1 &&
reporting_info.last_error_code() != 0 &&
reporting_info.last_attempt_was_https() &&
!insecure_server_url_.is_empty()) {
UploadLogToURL(compressed_log_data, log_metadata, log_hash, log_signature,
reporting_info, insecure_server_url_);
return;
}
UploadLogToURL(compressed_log_data, log_metadata, log_hash, log_signature,
reporting_info, server_url_);
}
void NetMetricsLogUploader::UploadLogToURL(
const std::string& compressed_log_data,
const LogMetadata& log_metadata,
const std::string& log_hash,
const std::string& log_signature,
const ReportingInfo& reporting_info,
const GURL& url) {
DCHECK(!log_hash.empty());
#ifndef NDEBUG
// For debug builds, you can use -vmodule=net_metrics_log_uploader=2
// to enable logging of uploaded histograms. You probably also want to use
// --force-enable-metrics-reporting, or metrics reporting may not be enabled.
LogUploadingHistograms(compressed_log_data);
#endif
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url = url;
// Drop cookies and auth data.
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
resource_request->method = "POST";
std::string reporting_info_string = SerializeReportingInfo(reporting_info);
// If we are not using HTTPS for this upload, encrypt it. We do not encrypt
// requests to localhost to allow testing with a local collector that doesn't
// have decryption enabled.
bool should_encrypt =
!url.SchemeIs(url::kHttpsScheme) && !net::IsLocalhost(url);
if (should_encrypt) {
std::string base64_encoded_hash;
if (!EncryptAndBase64EncodeString(log_hash, &base64_encoded_hash)) {
HTTPFallbackAborted();
return;
}
resource_request->headers.SetHeader("X-Chrome-UMA-Log-SHA1",
base64_encoded_hash);
std::string base64_encoded_signature;
if (!EncryptAndBase64EncodeString(log_signature,
&base64_encoded_signature)) {
HTTPFallbackAborted();
return;
}
resource_request->headers.SetHeader("X-Chrome-UMA-Log-HMAC-SHA256",
base64_encoded_signature);
std::string base64_reporting_info;
if (!EncryptAndBase64EncodeString(reporting_info_string,
&base64_reporting_info)) {
HTTPFallbackAborted();
return;
}
resource_request->headers.SetHeader("X-Chrome-UMA-ReportingInfo",
base64_reporting_info);
} else {
resource_request->headers.SetHeader("X-Chrome-UMA-Log-SHA1", log_hash);
resource_request->headers.SetHeader("X-Chrome-UMA-Log-HMAC-SHA256",
log_signature);
resource_request->headers.SetHeader("X-Chrome-UMA-ReportingInfo",
reporting_info_string);
// Tell the server that we're uploading gzipped protobufs only if we are not
// encrypting, since encrypted messages have to be decrypted server side
// after decryption, not before.
resource_request->headers.SetHeader("content-encoding", "gzip");
}
net::NetworkTrafficAnnotationTag traffic_annotation =
GetNetworkTrafficAnnotation(service_type_, log_metadata);
url_loader_ = network::SimpleURLLoader::Create(std::move(resource_request),
traffic_annotation);
if (should_encrypt) {
std::string encrypted_message;
if (!EncryptString(compressed_log_data, &encrypted_message)) {
url_loader_.reset();
HTTPFallbackAborted();
return;
}
url_loader_->AttachStringForUpload(encrypted_message, mime_type_);
} else {
url_loader_->AttachStringForUpload(compressed_log_data, mime_type_);
}
// It's safe to use |base::Unretained(this)| here, because |this| owns
// the |url_loader_|, and the callback will be cancelled if the |url_loader_|
// is destroyed.
url_loader_->DownloadToStringOfUnboundedSizeUntilCrashAndDie(
url_loader_factory_.get(),
base::BindOnce(&NetMetricsLogUploader::OnURLLoadComplete,
base::Unretained(this)));
}
void NetMetricsLogUploader::HTTPFallbackAborted() {
// The callback is called with: a response code of 0 to indicate no upload was
// attempted, a generic net error, and false to indicate it wasn't a secure
// connection. If no server URLs were specified, discard the log and do not
// attempt retransmission.
bool force_discard =
server_url_.is_empty() && insecure_server_url_.is_empty();
std::string_view force_discard_reason =
force_discard ? kNoUploadUrlsReasonMsg : "";
on_upload_complete_.Run(/*response_code=*/0, net::ERR_FAILED,
/*was_https=*/false, force_discard,
force_discard_reason);
}
// The callback is only invoked if |url_loader_| it was bound against is alive.
void NetMetricsLogUploader::OnURLLoadComplete(
std::unique_ptr<std::string> response_body) {
int response_code = -1;
if (url_loader_->ResponseInfo() && url_loader_->ResponseInfo()->headers) {
response_code = url_loader_->ResponseInfo()->headers->response_code();
}
int error_code = url_loader_->NetError();
bool was_https = url_loader_->GetFinalURL().SchemeIs(url::kHttpsScheme);
url_loader_.reset();
// If no server URLs were specified, discard the log and do not attempt
// retransmission.
bool force_discard =
server_url_.is_empty() && insecure_server_url_.is_empty();
std::string_view force_discard_reason =
force_discard ? kNoUploadUrlsReasonMsg : "";
on_upload_complete_.Run(response_code, error_code, was_https, force_discard,
force_discard_reason);
}
} // namespace metrics
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