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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
content / browser / attribution_reporting / attribution_host.cc [blame]
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/attribution_reporting/attribution_host.h"
#include <stdint.h>
#include <optional>
#include <string>
#include <utility>
#include "base/check.h"
#include "base/check_op.h"
#include "base/containers/flat_set.h"
#include "base/debug/crash_logging.h"
#include "base/feature_list.h"
#include "base/metrics/histogram_functions.h"
#include "base/metrics/histogram_macros.h"
#include "build/build_config.h"
#include "build/buildflag.h"
#include "components/attribution_reporting/data_host.mojom.h"
#include "components/attribution_reporting/features.h"
#include "components/attribution_reporting/registration_eligibility.mojom.h"
#include "components/attribution_reporting/suitable_origin.h"
#include "content/browser/attribution_reporting/attribution_data_host_manager.h"
#include "content/browser/attribution_reporting/attribution_input_event.h"
#include "content/browser/attribution_reporting/attribution_manager.h"
#include "content/browser/attribution_reporting/attribution_suitable_context.h"
#include "content/browser/renderer_host/frame_tree.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/navigation_request.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/navigation_handle.h"
#include "content/public/browser/navigation_handle_user_data.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_features.h"
#include "mojo/public/cpp/bindings/message.h"
#include "net/url_request/url_request.h"
#include "services/network/public/cpp/features.h"
#include "third_party/abseil-cpp/absl/types/variant.h"
#include "third_party/blink/public/common/navigation/impression.h"
#include "url/gurl.h"
#include "url/origin.h"
#if BUILDFLAG(IS_ANDROID)
#include "content/browser/attribution_reporting/attribution_input_event_tracker_android.h"
#endif
namespace content {
namespace {
using ::attribution_reporting::SuitableOrigin;
// Auxiliary data that lives alongside a NavigationHandle, tracking
// whether the navigation is "insecurely tainted" i.e. has seen an
// insecure hop in its path. This should only be present for navigations which
// have had at least one secure response with Attribution headers.
//
// For now, it is only used for metrics collection, but it may be extended in
// the future to block secure registration attempts after an insecure redirect
// was seen. See https://github.com/WICG/attribution-reporting-api/issues/767.
class InsecureTaintTracker
: public NavigationHandleUserData<InsecureTaintTracker> {
public:
explicit InsecureTaintTracker(NavigationHandle&) {}
~InsecureTaintTracker() override {
if (had_any_secure_attempts_) {
base::UmaHistogramExactLinear("Conversions.IncrementalTaintingFailures",
num_secure_registrations_after_tainting_,
net::URLRequest::kMaxRedirects + 1);
}
}
InsecureTaintTracker(const InsecureTaintTracker&) = delete;
InsecureTaintTracker& operator=(const InsecureTaintTracker&) = delete;
void TaintInsecure() { navigation_is_tainted_ = true; }
void NotifySecureRegistrationAttempt() {
had_any_secure_attempts_ = true;
num_secure_registrations_after_tainting_ += navigation_is_tainted_;
}
NAVIGATION_HANDLE_USER_DATA_KEY_DECL();
private:
int num_secure_registrations_after_tainting_ = 0;
bool navigation_is_tainted_ = false;
bool had_any_secure_attempts_ = false;
};
NAVIGATION_HANDLE_USER_DATA_KEY_IMPL(InsecureTaintTracker);
} // namespace
AttributionHost::AttributionHost(WebContents* web_contents)
: WebContentsObserver(web_contents),
WebContentsUserData<AttributionHost>(*web_contents),
receivers_(web_contents, this) {
DCHECK(base::FeatureList::IsEnabled(
attribution_reporting::features::kConversionMeasurement));
#if BUILDFLAG(IS_ANDROID)
if (base::FeatureList::IsEnabled(
network::features::kAttributionReportingCrossAppWeb)) {
input_event_tracker_android_ =
std::make_unique<AttributionInputEventTrackerAndroid>(web_contents);
}
#endif
}
AttributionHost::~AttributionHost() {
DCHECK(ongoing_registration_eligible_navigations_.empty());
}
AttributionInputEvent AttributionHost::GetMostRecentNavigationInputEvent()
const {
AttributionInputEvent input;
#if BUILDFLAG(IS_ANDROID)
if (input_event_tracker_android_) {
AttributionInputEventTrackerAndroid::InputEvent input_event =
input_event_tracker_android_->GetMostRecentEvent();
input.input_event = std::move(input_event.event);
input.input_event_id = input_event.id;
}
#endif
return input;
}
void AttributionHost::DidStartNavigation(NavigationHandle* navigation_handle) {
const auto& impression = navigation_handle->GetImpression();
// TODO(crbug.com/40262156): Consider checking for navigations taking place in
// a prerendered main frame.
// Impression navigations need to navigate the primary main frame to be valid.
// Impressions should never be attached to same-document navigations but can
// be the result of a bad renderer.
if (!impression || !navigation_handle->IsInPrimaryMainFrame() ||
navigation_handle->IsSameDocument()) {
return;
}
RenderFrameHostImpl* initiator_frame_host =
navigation_handle->GetInitiatorFrameToken().has_value()
? RenderFrameHostImpl::FromFrameToken(
navigation_handle->GetInitiatorProcessId(),
navigation_handle->GetInitiatorFrameToken().value())
: nullptr;
// The initiator frame host may be deleted by this point. In that case, ignore
// this navigation and drop the impression associated with it.
UMA_HISTOGRAM_BOOLEAN("Conversions.ImpressionNavigationHasDeadInitiator",
initiator_frame_host == nullptr);
// Look up the initiator root's origin which will be used as the impression
// origin. This works because we won't update the origin for the initiator RFH
// until we receive confirmation from the renderer that it has committed.
// Since frame mutation is all serialized on the Blink main thread, we get an
// implicit ordering: a navigation with an impression attached won't be
// processed after a navigation commit in the initiator RFH, so reading the
// origin off is safe at the start of the navigation.
auto suitable_context =
AttributionSuitableContext::Create(initiator_frame_host);
if (!suitable_context.has_value()) {
return;
}
auto* navigation_request = static_cast<NavigationRequest*>(navigation_handle);
AttributionDataHostManager* manager = suitable_context->data_host_manager();
manager->NotifyNavigationRegistrationStarted(
*std::move(suitable_context), impression->attribution_src_token,
navigation_handle->GetNavigationId(),
// The devtools_navigation_token is going to be used as the
// navigation's request devtools inspector ID if there is an enabled
// agent host.
navigation_request->devtools_navigation_token().ToString());
auto [_, inserted] = ongoing_registration_eligible_navigations_.emplace(
navigation_handle->GetNavigationId());
CHECK(inserted);
}
void AttributionHost::DidRedirectNavigation(
NavigationHandle* navigation_handle) {
NotifyNavigationRegistrationData(navigation_handle);
}
void AttributionHost::DidFinishNavigation(NavigationHandle* navigation_handle) {
const auto& impression = navigation_handle->GetImpression();
if (!impression.has_value()) {
return;
}
NotifyNavigationRegistrationData(navigation_handle);
auto* attribution_manager =
AttributionManager::FromWebContents(web_contents());
CHECK(attribution_manager);
attribution_manager->GetDataHostManager()
->NotifyNavigationRegistrationCompleted(
impression->attribution_src_token);
ongoing_registration_eligible_navigations_.erase(
navigation_handle->GetNavigationId());
}
void AttributionHost::NotifyNavigationRegistrationData(
NavigationHandle* navigation_handle) {
if (!ongoing_registration_eligible_navigations_.contains(
navigation_handle->GetNavigationId())) {
return;
}
const std::optional<blink::Impression>& impression =
navigation_handle->GetImpression();
// If there is an ongoing_registration_eligible_navigation, the navigation
// must have an associated impression, be in the primary main frame and not in
// the same document.
DCHECK(impression.has_value());
DCHECK(navigation_handle->IsInPrimaryMainFrame());
DCHECK(!navigation_handle->IsSameDocument());
// Populates `is_final_response` based on the headers to handle the case of an
// intercepted redirect. See https://crbug.com/1520612.
auto* headers = navigation_handle->GetResponseHeaders();
const bool is_final_response =
!(headers && headers->IsRedirect(/*location=*/nullptr));
// On redirect, the reporting origin should be the origin of the request
// responsible for initiating the redirect. At this point, the navigation
// handle reflects the URL being navigated to, so instead use the second to
// last URL in the redirect chain.
//
// On final response, the reporting origin should be the origin of the request
// responsible for initiating the last (and only if no redirections) request
// in the chain.
const size_t offset = is_final_response ? 1 : 2;
const std::vector<GURL>& redirect_chain =
navigation_handle->GetRedirectChain();
if (redirect_chain.size() < offset) {
return;
}
GURL reporting_url = redirect_chain[redirect_chain.size() - offset];
// Pass the suitability as a proxy for the potentially trustworthy check, as
// redirects should only happen for HTTP-based navigations.
auto* tracker =
InsecureTaintTracker::GetOrCreateForNavigationHandle(*navigation_handle);
if (!SuitableOrigin::IsSuitable(url::Origin::Create(reporting_url))) {
tracker->TaintInsecure();
return;
}
auto* attribution_manager =
AttributionManager::FromWebContents(web_contents());
DCHECK(attribution_manager);
bool had_header =
attribution_manager->GetDataHostManager()
->NotifyNavigationRegistrationData(impression->attribution_src_token,
headers, std::move(reporting_url));
if (had_header) {
tracker->NotifySecureRegistrationAttempt();
}
}
void AttributionHost::RegisterDataHost(
mojo::PendingReceiver<attribution_reporting::mojom::DataHost> data_host,
attribution_reporting::mojom::RegistrationEligibility
registration_eligibility,
bool is_for_background_requests) {
auto suitable_context = AttributionSuitableContext::Create(
static_cast<RenderFrameHostImpl*>(receivers_.GetCurrentTargetFrame()));
if (!suitable_context.has_value()) {
return;
}
AttributionDataHostManager* manager = suitable_context->data_host_manager();
manager->RegisterDataHost(std::move(data_host), *std::move(suitable_context),
registration_eligibility,
is_for_background_requests);
}
void AttributionHost::NotifyNavigationWithBackgroundRegistrationsWillStart(
const blink::AttributionSrcToken& attribution_src_token,
uint32_t expected_registrations) {
auto suitable_context = AttributionSuitableContext::Create(
static_cast<RenderFrameHostImpl*>(receivers_.GetCurrentTargetFrame()));
if (!suitable_context.has_value()) {
return;
}
if (!suitable_context->data_host_manager()
->NotifyNavigationWithBackgroundRegistrationsWillStart(
attribution_src_token, expected_registrations)) {
mojo::ReportBadMessage(
"Renderer attempted to notify of expected registrations with a "
"duplicate AttributionSrcToken or an invalid number of expected "
"registrations.");
return;
}
}
void AttributionHost::RegisterNavigationDataHost(
mojo::PendingReceiver<attribution_reporting::mojom::DataHost> data_host,
const blink::AttributionSrcToken& attribution_src_token) {
auto suitable_context = AttributionSuitableContext::Create(
static_cast<RenderFrameHostImpl*>(receivers_.GetCurrentTargetFrame()));
if (!suitable_context.has_value()) {
return;
}
if (!suitable_context->data_host_manager()->RegisterNavigationDataHost(
std::move(data_host), attribution_src_token)) {
mojo::ReportBadMessage(
"Renderer attempted to register a data host with a duplicate "
"AttributionSrcToken.");
return;
}
}
// static
void AttributionHost::BindReceiver(
mojo::PendingAssociatedReceiver<blink::mojom::AttributionHost> receiver,
RenderFrameHost* rfh) {
auto* web_contents = WebContents::FromRenderFrameHost(rfh);
if (!web_contents) {
return;
}
auto* attribution_host = AttributionHost::FromWebContents(web_contents);
if (!attribution_host) {
return;
}
attribution_host->receivers_.Bind(rfh, std::move(receiver));
}
WEB_CONTENTS_USER_DATA_KEY_IMPL(AttributionHost);
} // namespace content