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
|
// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/safe_browsing_verdict_handler.h"
#include "base/metrics/histogram_macros.h"
#include "base/stl_util.h"
#include "base/trace_event/trace_event.h"
#include "extensions/browser/blocklist_extension_prefs.h"
#include "extensions/browser/blocklist_state.h"
#include "extensions/browser/extension_registrar.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/extension.h"
namespace extensions {
namespace {
// Partitions `before`, `after` and `unchanged` into `no_longer` and
// `not_yet`.
// `no_longer` = `before` - `after` - `unchanged`.
// `not_yet` = `after` - `before`.
void Partition(const ExtensionIdSet& before,
const ExtensionIdSet& after,
const ExtensionIdSet& unchanged,
ExtensionIdSet* no_longer,
ExtensionIdSet* not_yet) {
*not_yet = base::STLSetDifference<ExtensionIdSet>(after, before);
*no_longer = base::STLSetDifference<ExtensionIdSet>(before, after);
*no_longer = base::STLSetDifference<ExtensionIdSet>(*no_longer, unchanged);
}
} // namespace
SafeBrowsingVerdictHandler::SafeBrowsingVerdictHandler(
ExtensionPrefs* extension_prefs,
ExtensionRegistry* registry,
ExtensionRegistrar* registrar)
: extension_prefs_(extension_prefs),
registry_(registry),
registrar_(registrar) {
extension_registry_observation_.Observe(registry_.get());
}
SafeBrowsingVerdictHandler::~SafeBrowsingVerdictHandler() = default;
void SafeBrowsingVerdictHandler::Init() {
TRACE_EVENT0("browser,startup", "SafeBrowsingVerdictHandler::Init");
const ExtensionSet all_extensions =
registry_->GenerateInstalledExtensionsSet();
for (const auto& extension : all_extensions) {
const BitMapBlocklistState state =
blocklist_prefs::GetSafeBrowsingExtensionBlocklistState(
extension->id(), extension_prefs_);
if (state == BitMapBlocklistState::BLOCKLISTED_SECURITY_VULNERABILITY ||
state == BitMapBlocklistState::BLOCKLISTED_POTENTIALLY_UNWANTED ||
state == BitMapBlocklistState::BLOCKLISTED_CWS_POLICY_VIOLATION) {
// If the extension was disabled in an older Chrome version, it is
// possible that the acknowledged state is not set. Backfill the
// acknowledged state if that's the case.
blocklist_prefs::AddAcknowledgedBlocklistState(extension->id(), state,
extension_prefs_);
greylist_.Insert(extension);
} else if (state == BitMapBlocklistState::BLOCKLISTED_MALWARE) {
blocklist_.Insert(extension);
}
}
}
void SafeBrowsingVerdictHandler::ManageBlocklist(
const Blocklist::BlocklistStateMap& state_map) {
ExtensionIdSet blocklist;
ExtensionIdSet greylist;
ExtensionIdSet unchanged;
ExtensionIdSet installed_ids =
registry_->GenerateInstalledExtensionsSet().GetIDs();
for (const auto& it : state_map) {
// It is possible that an extension is uninstalled when the blocklist is
// fetching asynchronously. In this case, we should ignore this extension.
if (!base::Contains(installed_ids, it.first)) {
continue;
}
switch (it.second) {
case NOT_BLOCKLISTED:
break;
case BLOCKLISTED_MALWARE:
blocklist.insert(it.first);
break;
case BLOCKLISTED_SECURITY_VULNERABILITY:
case BLOCKLISTED_CWS_POLICY_VIOLATION:
case BLOCKLISTED_POTENTIALLY_UNWANTED:
greylist.insert(it.first);
break;
case BLOCKLISTED_UNKNOWN:
unchanged.insert(it.first);
break;
}
}
UpdateBlocklistedExtensions(blocklist, unchanged);
UpdateGreylistedExtensions(greylist, unchanged, state_map);
}
void SafeBrowsingVerdictHandler::UpdateBlocklistedExtensions(
const ExtensionIdSet& blocklist,
const ExtensionIdSet& unchanged) {
ExtensionIdSet not_yet_blocked, no_longer_blocked;
Partition(blocklist_.GetIDs(), blocklist, unchanged, &no_longer_blocked,
¬_yet_blocked);
for (const auto& id : no_longer_blocked) {
scoped_refptr<const Extension> extension = blocklist_.GetByID(id);
DCHECK(extension.get())
<< "Extension " << id << " must be in the blocklist.";
blocklist_.Remove(id);
blocklist_prefs::SetSafeBrowsingExtensionBlocklistState(
id, BitMapBlocklistState::NOT_BLOCKLISTED, extension_prefs_);
registrar_->OnBlocklistStateRemoved(id);
UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.UnblacklistInstalled",
extension->location());
}
for (const auto& id : not_yet_blocked) {
scoped_refptr<const Extension> extension =
registry_->GetInstalledExtension(id);
DCHECK(extension.get()) << "Extension " << id << " needs to be "
<< "blocklisted, but it's not installed.";
blocklist_.Insert(extension);
blocklist_prefs::SetSafeBrowsingExtensionBlocklistState(
id, BitMapBlocklistState::BLOCKLISTED_MALWARE, extension_prefs_);
registrar_->OnBlocklistStateAdded(id);
UMA_HISTOGRAM_ENUMERATION("ExtensionBlacklist.BlacklistInstalled",
extension->location());
}
}
void SafeBrowsingVerdictHandler::UpdateGreylistedExtensions(
const ExtensionIdSet& greylist,
const ExtensionIdSet& unchanged,
const Blocklist::BlocklistStateMap& state_map) {
ExtensionIdSet not_yet_greylisted;
ExtensionIdSet no_longer_greylisted;
Partition(greylist_.GetIDs(), greylist, unchanged, &no_longer_greylisted,
¬_yet_greylisted);
for (const auto& id : no_longer_greylisted) {
scoped_refptr<const Extension> extension = greylist_.GetByID(id);
DCHECK(extension.get()) << "Extension " << id << " no longer greylisted, "
<< "but it was not marked as greylisted.";
greylist_.Remove(id);
blocklist_prefs::SetSafeBrowsingExtensionBlocklistState(
extension->id(), BitMapBlocklistState::NOT_BLOCKLISTED,
extension_prefs_);
registrar_->OnGreylistStateRemoved(extension->id());
UMA_HISTOGRAM_ENUMERATION("Extensions.Greylist.Enabled",
extension->location());
}
// Iterate over `greylist` instead of `not_yet_greylisted`, because the
// extension needs to be disabled again if it is switched to another greylist
// state.
for (const auto& id : greylist) {
scoped_refptr<const Extension> extension =
registry_->GetInstalledExtension(id);
DCHECK(extension.get()) << "Extension " << id << " needs to be "
<< "disabled, but it's not installed.";
greylist_.Insert(extension);
BlocklistState greylist_state = state_map.find(id)->second;
BitMapBlocklistState bitmap_greylist_state =
blocklist_prefs::BlocklistStateToBitMapBlocklistState(greylist_state);
blocklist_prefs::SetSafeBrowsingExtensionBlocklistState(
extension->id(), bitmap_greylist_state, extension_prefs_);
registrar_->OnGreylistStateAdded(id, bitmap_greylist_state);
UMA_HISTOGRAM_ENUMERATION("Extensions.Greylist.Disabled",
extension->location());
}
}
void SafeBrowsingVerdictHandler::OnExtensionUninstalled(
content::BrowserContext* browser_context,
const Extension* extension,
UninstallReason reason) {
blocklist_.Remove(extension->id());
greylist_.Remove(extension->id());
}
} // namespace extensions
|
