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
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
content / browser / renderer_host / ipc_utils.cc [blame]
// Copyright 2019 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/renderer_host/ipc_utils.h"
#include <optional>
#include <utility>
#include "content/browser/bad_message.h"
#include "content/browser/blob_storage/chrome_blob_storage_context.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/browser/renderer_host/frame_tree_node.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/common/features.h"
#include "content/common/frame.mojom.h"
#include "content/common/navigation_params_utils.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/child_process_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/url_constants.h"
#include "mojo/public/cpp/system/message_pipe.h"
#include "third_party/blink/public/mojom/navigation/navigation_params.mojom.h"
namespace content {
namespace {
// Validates that |received_token| is non-null iff associated with a blob: URL.
bool VerifyBlobToken(
int process_id,
const mojo::PendingRemote<blink::mojom::BlobURLToken>& received_token,
const GURL& received_url) {
DCHECK_NE(ChildProcessHost::kInvalidUniqueID, process_id);
if (received_token.is_valid()) {
if (!received_url.SchemeIsBlob()) {
bad_message::ReceivedBadMessage(
process_id, bad_message::BLOB_URL_TOKEN_FOR_NON_BLOB_URL);
return false;
}
}
return true;
}
bool VerifyInitiatorOrigin(
int process_id,
const url::Origin& initiator_origin,
const RenderFrameHostImpl* current_rfh = nullptr,
GURL* navigation_url = nullptr,
std::optional<blink::LocalFrameToken>* initiator_frame_token = nullptr) {
// TODO(crbug.com/40109437): Ideally, origin verification should be performed
// even if `initiator_origin` is opaque, to ensure that the precursor origin
// matches the process lock. However, there are a couple of cases where this
// doesn't yet work, which are documented and skipped below.
if (initiator_origin.opaque()) {
// TODO(alexmos): This used to allow all opaque origins; this behavior is
// now behind a kill switch and should be removed once the rollout in M128
// is complete.
if (!base::FeatureList::IsEnabled(
features::kAdditionalOpaqueOriginEnforcements)) {
return true;
}
// Reloads initiated from error pages may currently lead to a precursor
// mismatch, since the error page loads with an opaque origin with the
// original URL's origin as its precursor, which may not match the error
// page's process lock. This is seen in the following
// RenderFrameHostManagerTest tests:
// 1. ErrorPageNavigationReload:
// - renderer origin lock = chrome-error://chromewebdata/
// - precursor of initiator origin = http://127.0.0.1:.../
// 2. ErrorPageNavigationReload_InSubframe_BlockedByClient
// - renderer origin lock = http://b.com:.../
// - precursor of initiator origin = http://c.com:.../
if (current_rfh && current_rfh->IsErrorDocument()) {
return true;
}
// Certain (e.g., data:) navigations in subframes of MHTML documents may
// have precursor origins that do not match the process lock of the MHTML
// document. This is seen in NavigationMhtmlBrowserTest.DataIframe, where:
// - renderer origin lock = { file:/// sandboxed }
// - precursor of initiator origin = http://8.8.8.8/
// Note that RenderFrameHostImpl::CanCommitOriginAndUrl() similarly allows
// such navigations to commit, and it also ensures that they can only commit
// in the main frame MHTML document's process.
if (current_rfh && current_rfh->IsMhtmlSubframe()) {
return true;
}
}
auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
if (!policy->HostsOrigin(process_id, initiator_origin)) {
if (navigation_url) {
static auto* const navigation_url_key =
base::debug::AllocateCrashKeyString(
"navigation_url", base::debug::CrashKeySize::Size256);
base::debug::SetCrashKeyString(
navigation_url_key,
navigation_url->DeprecatedGetOriginAsURL().spec());
}
if (initiator_frame_token && initiator_frame_token->has_value()) {
if (RenderFrameHostImpl* initiator_render_frame_host =
RenderFrameHostImpl::FromFrameToken(
process_id, initiator_frame_token->value())) {
static auto* const initiator_rfh_origin_key =
base::debug::AllocateCrashKeyString(
"initiator_rfh_origin", base::debug::CrashKeySize::Size256);
base::debug::SetCrashKeyString(
initiator_rfh_origin_key,
initiator_render_frame_host->GetLastCommittedOrigin()
.GetDebugString());
}
}
if (current_rfh) {
auto bool_to_crash_key = [](bool b) { return b ? "true" : "false"; };
static auto* const is_main_frame_key =
base::debug::AllocateCrashKeyString(
"is_main_frame", base::debug::CrashKeySize::Size32);
base::debug::SetCrashKeyString(
is_main_frame_key, bool_to_crash_key(current_rfh->is_main_frame()));
static auto* const is_outermost_frame_key =
base::debug::AllocateCrashKeyString(
"is_outermost_frame", base::debug::CrashKeySize::Size32);
base::debug::SetCrashKeyString(
is_outermost_frame_key,
bool_to_crash_key(current_rfh->IsOutermostMainFrame()));
static auto* const is_on_initial_empty_document_key =
base::debug::AllocateCrashKeyString(
"is_on_initial_empty_doc", base::debug::CrashKeySize::Size32);
base::debug::SetCrashKeyString(
is_on_initial_empty_document_key,
bool_to_crash_key(
current_rfh->frame_tree_node()->is_on_initial_empty_document()));
static auto* const last_committed_origin_key =
base::debug::AllocateCrashKeyString(
"last_committed_origin", base::debug::CrashKeySize::Size256);
base::debug::SetCrashKeyString(
last_committed_origin_key,
current_rfh->GetLastCommittedOrigin().GetDebugString());
if (current_rfh->GetParentOrOuterDocumentOrEmbedder()) {
static auto* const parent_etc_origin_key =
base::debug::AllocateCrashKeyString(
"parent_etc_origin", base::debug::CrashKeySize::Size256);
base::debug::SetCrashKeyString(
parent_etc_origin_key,
current_rfh->GetParentOrOuterDocumentOrEmbedder()
->GetLastCommittedOrigin()
.GetDebugString());
}
if (FrameTreeNode* opener = current_rfh->frame_tree_node()->opener()) {
static auto* const opener_origin_key =
base::debug::AllocateCrashKeyString(
"opener_origin", base::debug::CrashKeySize::Size256);
base::debug::SetCrashKeyString(opener_origin_key,
opener->current_frame_host()
->GetLastCommittedOrigin()
.GetDebugString());
}
}
bad_message::ReceivedBadMessage(process_id,
bad_message::INVALID_INITIATOR_ORIGIN);
return false;
}
return true;
}
} // namespace
bool VerifyDownloadUrlParams(RenderProcessHost* process,
const blink::mojom::DownloadURLParams& params) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
CHECK(process);
int process_id = process->GetID();
// Verifies |params.blob_url_token| is appropriately set.
if (!VerifyBlobToken(process_id, params.blob_url_token, params.url))
return false;
// Verify |params.initiator_origin|.
if (params.initiator_origin &&
!VerifyInitiatorOrigin(process_id, *params.initiator_origin))
return false;
// If |params.url| is not set, this must be a large data URL being passed
// through |params.data_url_blob|.
if (!params.url.is_valid() && !params.data_url_blob.is_valid())
return false;
// Verification succeeded.
return true;
}
bool VerifyOpenURLParams(RenderFrameHostImpl* current_rfh,
RenderProcessHost* process,
const blink::mojom::OpenURLParamsPtr& params,
GURL* out_validated_url,
scoped_refptr<network::SharedURLLoaderFactory>*
out_blob_url_loader_factory) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(current_rfh);
DCHECK(process);
DCHECK(out_validated_url);
DCHECK(out_blob_url_loader_factory);
int process_id = process->GetID();
// Verify |params.url| and populate |out_validated_url|.
*out_validated_url = params->url;
process->FilterURL(false, out_validated_url);
// Verify |params.blob_url_token| and populate |out_blob_url_loader_factory|.
if (!VerifyBlobToken(process_id, params->blob_url_token, params->url))
return false;
if (params->blob_url_token.is_valid()) {
*out_blob_url_loader_factory =
ChromeBlobStorageContext::URLLoaderFactoryForToken(
process->GetStoragePartition(), std::move(params->blob_url_token));
}
// Verify |params.post_body|.
auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
if (!policy->CanReadRequestBody(process, params->post_body)) {
bad_message::ReceivedBadMessage(process,
bad_message::ILLEGAL_UPLOAD_PARAMS);
return false;
}
// Verify |params.initiator_origin|.
if (!VerifyInitiatorOrigin(process_id, params->initiator_origin, current_rfh,
¶ms->url, ¶ms->initiator_frame_token)) {
return false;
}
if (params->initiator_base_url) {
// `initiator_base_url` should only be defined for about:blank and
// about:srcdoc navigations, and should never be an empty GURL (if it is not
// nullopt).
if (params->initiator_base_url->is_empty() ||
!(out_validated_url->IsAboutBlank() ||
out_validated_url->IsAboutSrcdoc())) {
return false;
}
}
// Verify that the initiator frame can navigate `current_rfh`.
if (!VerifyNavigationInitiator(current_rfh, params->initiator_frame_token,
process_id)) {
return false;
}
if (params->is_container_initiated) {
if (!current_rfh->GetParent() ||
(current_rfh->GetParent()->GetFrameToken() !=
params->initiator_frame_token)) {
mojo::ReportBadMessage(
"container initiated navigation from non-parent process");
return false;
}
}
// Verification succeeded.
return true;
}
bool VerifyBeginNavigationCommonParams(
const RenderFrameHostImpl& current_rfh,
blink::mojom::CommonNavigationParams* common_params,
std::optional<blink::LocalFrameToken>& initiator_frame_token) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
DCHECK(common_params);
RenderProcessHost* process = current_rfh.GetProcess();
int process_id = process->GetID();
// Verify (and possibly rewrite) |url|.
process->FilterURL(false, &common_params->url);
if (common_params->url.SchemeIs(kChromeErrorScheme)) {
mojo::ReportBadMessage("Renderer cannot request error page URLs directly");
return false;
}
// Verify |post_data|.
auto* policy = ChildProcessSecurityPolicyImpl::GetInstance();
if (!policy->CanReadRequestBody(process, common_params->post_data)) {
bad_message::ReceivedBadMessage(process,
bad_message::ILLEGAL_UPLOAD_PARAMS);
return false;
}
// Verify |transition| is webby.
if (!PageTransitionIsWebTriggerable(
ui::PageTransitionFromInt(common_params->transition))) {
bad_message::ReceivedBadMessage(
process, bad_message::RFHI_BEGIN_NAVIGATION_NON_WEBBY_TRANSITION);
return false;
}
// Verify |initiator_origin|.
if (!common_params->initiator_origin.has_value()) {
bad_message::ReceivedBadMessage(
process, bad_message::RFHI_BEGIN_NAVIGATION_MISSING_INITIATOR_ORIGIN);
return false;
}
if (!VerifyInitiatorOrigin(
process_id, common_params->initiator_origin.value(), ¤t_rfh,
&common_params->url, &initiator_frame_token)) {
return false;
}
// Verify |base_url_for_data_url|.
if (!common_params->base_url_for_data_url.is_empty()) {
// Kills the process. http://crbug.com/726142
bad_message::ReceivedBadMessage(
process, bad_message::RFH_BASE_URL_FOR_DATA_URL_SPECIFIED);
return false;
}
// Verify |initiator_base_url|. The value is allowed to be nullopt, but if it
// isn't then it's required to be non-empty (the renderer is supposed to
// guarantee this). If this condition isn't met, CHECK in NavigationRequest's
// constructor will fail.
if (common_params->initiator_base_url &&
common_params->initiator_base_url->is_empty()) {
bad_message::ReceivedBadMessage(
process, bad_message::RFH_INITIATOR_BASE_URL_IS_EMPTY);
return false;
}
// Asynchronous (browser-controlled, but) renderer-initiated navigations can
// not be same-document. Allowing this incorrectly could have us try to
// navigate an existing document to a different site.
if (NavigationTypeUtils::IsSameDocument(common_params->navigation_type))
return false;
// Verification succeeded.
return true;
}
bool VerifyNavigationInitiator(
RenderFrameHostImpl* current_rfh,
const std::optional<blink::LocalFrameToken>& initiator_frame_token,
int initiator_process_id) {
// Verify that a frame inside a fenced frame cannot navigate its ancestors,
// unless the frame being navigated is the outermost main frame.
if (current_rfh->IsOutermostMainFrame())
return true;
if (!initiator_frame_token)
return true;
RenderFrameHostImpl* initiator_render_frame_host =
RenderFrameHostImpl::FromFrameToken(initiator_process_id,
initiator_frame_token.value());
if (!initiator_render_frame_host)
return true;
// Verify that a frame cannot navigate a frame with a different fenced frame
// nonce, unless the navigating frame is a fenced frame root and its owner
// frame has the same fenced frame nonce as the initiator frame (e.g. in a
// A(A1,A2(FF)) setup, A, A1, and A2 are all allowed to navigate FF).
std::optional<base::UnguessableToken> initiator_fenced_frame_nonce =
initiator_render_frame_host->frame_tree_node()->GetFencedFrameNonce();
if (initiator_fenced_frame_nonce !=
current_rfh->frame_tree_node()->GetFencedFrameNonce()) {
if (!current_rfh->IsFencedFrameRoot() ||
current_rfh->frame_tree_node()
->GetParentOrOuterDocument()
->frame_tree_node()
->GetFencedFrameNonce() != initiator_fenced_frame_nonce) {
mojo::ReportBadMessage(
"The fenced frame nonces of initiator and current frame don't match, "
"nor is the current frame a fenced frame root whose owner frame has "
"the same fenced frame nonce as the initiator frame.");
return false;
}
}
if (!initiator_render_frame_host->IsNestedWithinFencedFrame())
return true;
FrameTreeNode* node = initiator_render_frame_host->frame_tree_node();
if (node == current_rfh->frame_tree_node())
return true;
while (node) {
node = node->parent() ? node->parent()->frame_tree_node() : nullptr;
if (node == current_rfh->frame_tree_node()) {
mojo::ReportBadMessage(
"A frame in a fenced frame tree cannot navigate an ancestor frame.");
return false;
}
}
return true;
}
} // namespace content