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
content / browser / preloading / prefetch / prefetch_origin_prober.cc [blame]
// Copyright 2022 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/preloading/prefetch/prefetch_origin_prober.h"
#include "base/feature_list.h"
#include "base/functional/bind.h"
#include "base/strings/string_util.h"
#include "content/browser/preloading/prefetch/prefetch_canary_checker.h"
#include "content/browser/preloading/prefetch/prefetch_dns_prober.h"
#include "content/browser/preloading/prefetch/prefetch_params.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/storage_partition.h"
#include "mojo/public/cpp/bindings/callback_helpers.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/self_owned_receiver.h"
#include "net/base/host_port_pair.h"
#include "net/base/isolation_info.h"
#include "net/base/network_anonymization_key.h"
#include "services/network/public/mojom/network_context.mojom.h"
#include "services/network/public/mojom/tcp_socket.mojom.h"
#include "services/network/public/mojom/tls_socket.mojom.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "url/origin.h"
namespace content {
namespace {
net::NetworkTrafficAnnotationTag GetProbingTrafficAnnotation() {
return net::DefineNetworkTrafficAnnotation("speculation_rules_prefetch_probe",
R"(
semantics {
sender: "Speculation Rules Prefetch Probe"
description:
"Verifies the end to end connection between the browser and the "
"origin site that the user is currently navigating to. This is "
"done during a navigation that was previously prefetched over a "
"proxy to check that the site is not blocked by middleboxes. "
"Such prefetches will be used to fetch render-blocking "
"content before being navigated by the user without impacting "
"privacy."
trigger:
"Used only when this feature and speculation rules feature are "
"enabled."
data: "None."
destination: WEBSITE
}
policy {
cookies_allowed: NO
setting:
"Users can control this via a setting specific to each content "
"embedder."
policy_exception_justification: "Not implemented."
})");
}
void TLSDropHandler(base::OnceClosure ui_only_callback) {
GetUIThreadTaskRunner({})->PostTask(FROM_HERE, std::move(ui_only_callback));
}
class TLSProber {
public:
TLSProber(const GURL& url,
PrefetchOriginProber::OnProbeResultCallback callback)
: url_(url), callback_(std::move(callback)) {}
~TLSProber() { DCHECK(!callback_); }
network::mojom::NetworkContext::CreateTCPConnectedSocketCallback
GetOnTCPConnectedCallback() {
network::mojom::NetworkContext::CreateTCPConnectedSocketCallback
tcp_handler = base::BindOnce(&TLSProber::OnTCPConnected,
weak_factory_.GetWeakPtr());
return mojo::WrapCallbackWithDropHandler(std::move(tcp_handler),
GetDropHandler());
}
mojo::PendingReceiver<network::mojom::TCPConnectedSocket>
GetTCPSocketReceiver() {
return tcp_socket_.BindNewPipeAndPassReceiver();
}
private:
void OnTCPConnected(int result,
const std::optional<net::IPEndPoint>& local_addr,
const std::optional<net::IPEndPoint>& peer_adder,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream) {
if (result != net::OK) {
HandleFailure();
return;
}
network::mojom::TCPConnectedSocket::UpgradeToTLSCallback tls_handler =
base::BindOnce(&TLSProber::OnUpgradeToTLS, weak_factory_.GetWeakPtr());
tcp_socket_->UpgradeToTLS(
net::HostPortPair::FromURL(url_), /*options=*/nullptr,
net::MutableNetworkTrafficAnnotationTag(GetProbingTrafficAnnotation()),
tls_socket_.BindNewPipeAndPassReceiver(),
/*observer=*/mojo::NullRemote(),
mojo::WrapCallbackWithDropHandler(std::move(tls_handler),
GetDropHandler()));
}
void OnUpgradeToTLS(int result,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream,
const std::optional<net::SSLInfo>& ssl_info) {
std::move(callback_).Run(result == net::OK
? PrefetchProbeResult::kTLSProbeSuccess
: PrefetchProbeResult::kTLSProbeFailure);
delete this;
}
base::OnceClosure GetDropHandler() {
// The drop handler is not guaranteed to be run on the original thread. Use
// the anon method above to fix that.
return base::BindOnce(
&TLSDropHandler,
base::BindOnce(&TLSProber::HandleFailure, weak_factory_.GetWeakPtr()));
}
void HandleFailure() {
std::move(callback_).Run(PrefetchProbeResult::kTLSProbeFailure);
delete this;
}
// The URL of the resource being probed. Only the host:port is used.
const GURL url_;
// The callback to run when the probe is complete.
PrefetchOriginProber::OnProbeResultCallback callback_;
// Mojo sockets. We only test that both can be connected.
mojo::Remote<network::mojom::TCPConnectedSocket> tcp_socket_;
mojo::Remote<network::mojom::TLSClientSocket> tls_socket_;
base::WeakPtrFactory<TLSProber> weak_factory_{this};
};
} // namespace
PrefetchOriginProber::PrefetchOriginProber(BrowserContext* browser_context,
const GURL& dns_canary_check_url,
const GURL& tls_canary_check_url)
: browser_context_(browser_context) {
// Check if probing is enabled
PrefetchCanaryChecker::RetryPolicy retry_policy;
retry_policy.max_retries = PrefetchCanaryCheckRetries();
if (PrefetchTLSCanaryCheckEnabled()) {
tls_canary_checker_ = PrefetchCanaryChecker::MakePrefetchCanaryChecker(
browser_context_, PrefetchCanaryChecker::CheckType::kTLS,
tls_canary_check_url, retry_policy, PrefetchCanaryCheckTimeout(),
PrefetchCanaryCheckCacheLifetime());
}
dns_canary_checker_ = PrefetchCanaryChecker::MakePrefetchCanaryChecker(
browser_context_, PrefetchCanaryChecker::CheckType::kDNS,
dns_canary_check_url, retry_policy, PrefetchCanaryCheckTimeout(),
PrefetchCanaryCheckCacheLifetime());
}
PrefetchOriginProber::~PrefetchOriginProber() = default;
void PrefetchOriginProber::RunCanaryChecksIfNeeded() const {
if (!PrefetchProbingEnabled() || !PrefetchCanaryCheckEnabled())
return;
if (dns_canary_checker_)
dns_canary_checker_->RunChecksIfNeeded();
if (tls_canary_checker_)
tls_canary_checker_->RunChecksIfNeeded();
}
bool PrefetchOriginProber::ShouldProbeOrigins() const {
if (!PrefetchProbingEnabled())
return false;
if (!PrefetchCanaryCheckEnabled() || !dns_canary_checker_)
return true;
// We call CanaryCheckSuccessful on all enabled canary checks to make sure
// their cache gets refreshed if necessary.
bool dns_success =
dns_canary_checker_->CanaryCheckSuccessful().value_or(false);
bool tls_success = true;
if (tls_canary_checker_)
tls_success = tls_canary_checker_->CanaryCheckSuccessful().value_or(false);
// If either check has failed or not completed in time, then probe.
return !dns_success || !tls_success;
}
void PrefetchOriginProber::Probe(const GURL& url,
OnProbeResultCallback callback) {
// If canary checks are disabled, or if the TLS canary check is enabled and
// failed (or did not complete), do TLS probing.
bool also_do_tls_connect = !PrefetchCanaryCheckEnabled() ||
(tls_canary_checker_ &&
!tls_canary_checker_->CanaryCheckSuccessful().value_or(false));
StartDNSResolution(url, std::move(callback), also_do_tls_connect);
}
void PrefetchOriginProber::StartDNSResolution(const GURL& url,
OnProbeResultCallback callback,
bool also_do_tls_connect) {
net::NetworkAnonymizationKey nak =
net::IsolationInfo::CreateForInternalRequest(url::Origin::Create(url))
.network_anonymization_key();
network::mojom::ResolveHostParametersPtr resolve_host_parameters =
network::mojom::ResolveHostParameters::New();
// This action is navigation-blocking, so use the highest priority.
resolve_host_parameters->initial_priority = net::RequestPriority::HIGHEST;
mojo::PendingRemote<network::mojom::ResolveHostClient> client_remote;
mojo::MakeSelfOwnedReceiver(
std::make_unique<PrefetchDNSProber>(base::BindOnce(
&PrefetchOriginProber::OnDNSResolved, weak_factory_.GetWeakPtr(), url,
std::move(callback), also_do_tls_connect)),
client_remote.InitWithNewPipeAndPassReceiver());
// TODO(crbug.com/40235854): Consider passing a SchemeHostPort to trigger
// HTTPS DNS resource record query.
browser_context_->GetDefaultStoragePartition()
->GetNetworkContext()
->ResolveHost(network::mojom::HostResolverHost::NewHostPortPair(
net::HostPortPair::FromURL(url)),
nak, std::move(resolve_host_parameters),
std::move(client_remote));
}
void PrefetchOriginProber::OnDNSResolved(
const GURL& url,
OnProbeResultCallback callback,
bool also_do_tls_connect,
int net_error,
const std::optional<net::AddressList>& resolved_addresses) {
bool successful = net_error == net::OK && resolved_addresses &&
!resolved_addresses->empty();
// A TLS connection needs the resolved addresses, so it also fails here.
if (!successful) {
std::move(callback).Run(PrefetchProbeResult::kDNSProbeFailure);
return;
}
if (!also_do_tls_connect) {
std::move(callback).Run(PrefetchProbeResult::kDNSProbeSuccess);
return;
}
DoTLSProbeAfterDNSResolution(url, std::move(callback), *resolved_addresses);
}
void PrefetchOriginProber::DoTLSProbeAfterDNSResolution(
const GURL& url,
OnProbeResultCallback callback,
const net::AddressList& addresses) {
DCHECK(!addresses.empty());
std::unique_ptr<TLSProber> prober =
std::make_unique<TLSProber>(url, std::move(callback));
browser_context_->GetDefaultStoragePartition()
->GetNetworkContext()
->CreateTCPConnectedSocket(
/*local_addr=*/std::nullopt, addresses,
/*tcp_connected_socket_options=*/nullptr,
net::MutableNetworkTrafficAnnotationTag(
GetProbingTrafficAnnotation()),
prober->GetTCPSocketReceiver(),
/*observer=*/mojo::NullRemote(), prober->GetOnTCPConnectedCallback());
// |prober| manages its own lifetime, using the mojo pipes.
prober.release();
}
} // namespace content