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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "UrlClassifierFeatureFingerprintingProtection.h"
#include "mozilla/AntiTrackingUtils.h"
#include "mozilla/net/UrlClassifierCommon.h"
#include "ChannelClassifierService.h"
#include "mozilla/StaticPrefs_privacy.h"
#include "nsNetUtil.h"
#include "mozilla/StaticPtr.h"
#include "nsIWebProgressListener.h"
#include "nsIHttpChannelInternal.h"
#include "nsIChannel.h"
namespace mozilla {
namespace net {
namespace {
#define FINGERPRINTING_FEATURE_NAME "fingerprinting-protection"
#define URLCLASSIFIER_FINGERPRINTING_BLOCKLIST \
"urlclassifier.features.fingerprinting.blacklistTables"
#define URLCLASSIFIER_FINGERPRINTING_BLOCKLIST_TEST_ENTRIES \
"urlclassifier.features.fingerprinting.blacklistHosts"
#define URLCLASSIFIER_FINGERPRINTING_ENTITYLIST \
"urlclassifier.features.fingerprinting.whitelistTables"
#define URLCLASSIFIER_FINGERPRINTING_ENTITYLIST_TEST_ENTRIES \
"urlclassifier.features.fingerprinting.whitelistHosts"
#define URLCLASSIFIER_FINGERPRINTING_EXCEPTION_URLS \
"urlclassifier.features.fingerprinting.skipURLs"
#define TABLE_FINGERPRINTING_BLOCKLIST_PREF "fingerprinting-blacklist-pref"
#define TABLE_FINGERPRINTING_ENTITYLIST_PREF "fingerprinting-whitelist-pref"
StaticRefPtr<UrlClassifierFeatureFingerprintingProtection>
gFeatureFingerprintingProtection;
} // namespace
UrlClassifierFeatureFingerprintingProtection::
UrlClassifierFeatureFingerprintingProtection()
: UrlClassifierFeatureAntiTrackingBase(
nsLiteralCString(FINGERPRINTING_FEATURE_NAME),
nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_BLOCKLIST),
nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_ENTITYLIST),
nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_BLOCKLIST_TEST_ENTRIES),
nsLiteralCString(
URLCLASSIFIER_FINGERPRINTING_ENTITYLIST_TEST_ENTRIES),
nsLiteralCString(TABLE_FINGERPRINTING_BLOCKLIST_PREF),
nsLiteralCString(TABLE_FINGERPRINTING_ENTITYLIST_PREF),
nsLiteralCString(URLCLASSIFIER_FINGERPRINTING_EXCEPTION_URLS)) {}
/* static */ const char* UrlClassifierFeatureFingerprintingProtection::Name() {
return FINGERPRINTING_FEATURE_NAME;
}
/* static */
void UrlClassifierFeatureFingerprintingProtection::MaybeInitialize() {
UC_LOG_LEAK(
("UrlClassifierFeatureFingerprintingProtection::MaybeInitialize"));
if (!gFeatureFingerprintingProtection) {
gFeatureFingerprintingProtection =
new UrlClassifierFeatureFingerprintingProtection();
gFeatureFingerprintingProtection->InitializePreferences();
}
}
/* static */
void UrlClassifierFeatureFingerprintingProtection::MaybeShutdown() {
UC_LOG_LEAK(("UrlClassifierFeatureFingerprintingProtection::MaybeShutdown"));
if (gFeatureFingerprintingProtection) {
gFeatureFingerprintingProtection->ShutdownPreferences();
gFeatureFingerprintingProtection = nullptr;
}
}
/* static */
already_AddRefed<UrlClassifierFeatureFingerprintingProtection>
UrlClassifierFeatureFingerprintingProtection::MaybeCreate(
nsIChannel* aChannel) {
MOZ_ASSERT(aChannel);
UC_LOG_LEAK(
("UrlClassifierFeatureFingerprintingProtection::MaybeCreate - channel %p",
aChannel));
if (!StaticPrefs::privacy_trackingprotection_fingerprinting_enabled()) {
return nullptr;
}
bool isThirdParty = AntiTrackingUtils::IsThirdPartyChannel(aChannel);
if (!isThirdParty) {
UC_LOG(
("UrlClassifierFeatureFingerprintingProtection::MaybeCreate - "
"skipping first party or top-level load for channel %p",
aChannel));
return nullptr;
}
if (UrlClassifierCommon::IsPassiveContent(aChannel)) {
return nullptr;
}
if (!UrlClassifierCommon::ShouldEnableProtectionForChannel(aChannel)) {
return nullptr;
}
MaybeInitialize();
MOZ_ASSERT(gFeatureFingerprintingProtection);
RefPtr<UrlClassifierFeatureFingerprintingProtection> self =
gFeatureFingerprintingProtection;
return self.forget();
}
/* static */
already_AddRefed<nsIUrlClassifierFeature>
UrlClassifierFeatureFingerprintingProtection::GetIfNameMatches(
const nsACString& aName) {
if (!aName.EqualsLiteral(FINGERPRINTING_FEATURE_NAME)) {
return nullptr;
}
MaybeInitialize();
MOZ_ASSERT(gFeatureFingerprintingProtection);
RefPtr<UrlClassifierFeatureFingerprintingProtection> self =
gFeatureFingerprintingProtection;
return self.forget();
}
NS_IMETHODIMP
UrlClassifierFeatureFingerprintingProtection::ProcessChannel(
nsIChannel* aChannel, const nsTArray<nsCString>& aList,
const nsTArray<nsCString>& aHashes, bool* aShouldContinue) {
NS_ENSURE_ARG_POINTER(aChannel);
NS_ENSURE_ARG_POINTER(aShouldContinue);
bool isAllowListed = UrlClassifierCommon::IsAllowListed(aChannel);
// This is a blocking feature.
*aShouldContinue = isAllowListed;
if (isAllowListed) {
return NS_OK;
}
nsAutoCString list;
UrlClassifierCommon::TablesToString(aList, list);
ChannelBlockDecision decision =
ChannelClassifierService::OnBeforeBlockChannel(aChannel, mName, list);
if (decision != ChannelBlockDecision::Blocked) {
uint32_t event =
decision == ChannelBlockDecision::Replaced
? nsIWebProgressListener::STATE_REPLACED_FINGERPRINTING_CONTENT
: nsIWebProgressListener::STATE_ALLOWED_FINGERPRINTING_CONTENT;
// Need to set aBlocked to True if we replace the Fingerprinter with a shim,
// since the shim is treated as a blocked event
if (event ==
nsIWebProgressListener::STATE_REPLACED_FINGERPRINTING_CONTENT) {
ContentBlockingNotifier::OnEvent(aChannel, event, true);
} else {
ContentBlockingNotifier::OnEvent(aChannel, event, false);
}
*aShouldContinue = true;
return NS_OK;
}
UrlClassifierCommon::SetBlockedContent(aChannel, NS_ERROR_FINGERPRINTING_URI,
list, ""_ns, ""_ns);
UC_LOG(
("UrlClassifierFeatureFingerprintingProtection::ProcessChannel - "
"cancelling channel %p",
aChannel));
nsCOMPtr<nsIHttpChannelInternal> httpChannel = do_QueryInterface(aChannel);
if (httpChannel) {
Unused << httpChannel->CancelByURLClassifier(NS_ERROR_FINGERPRINTING_URI);
} else {
Unused << aChannel->Cancel(NS_ERROR_FINGERPRINTING_URI);
}
return NS_OK;
}
NS_IMETHODIMP
UrlClassifierFeatureFingerprintingProtection::GetURIByListType(
nsIChannel* aChannel, nsIUrlClassifierFeature::listType aListType,
nsIUrlClassifierFeature::URIType* aURIType, nsIURI** aURI) {
NS_ENSURE_ARG_POINTER(aChannel);
NS_ENSURE_ARG_POINTER(aURIType);
NS_ENSURE_ARG_POINTER(aURI);
if (aListType == nsIUrlClassifierFeature::blocklist) {
*aURIType = nsIUrlClassifierFeature::blocklistURI;
return aChannel->GetURI(aURI);
}
MOZ_ASSERT(aListType == nsIUrlClassifierFeature::entitylist);
*aURIType = nsIUrlClassifierFeature::pairwiseEntitylistURI;
return UrlClassifierCommon::CreatePairwiseEntityListURI(aChannel, aURI);
}
} // namespace net
} // namespace mozilla
|
