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
content / browser / renderer_host / pepper / browser_ppapi_host_impl.cc [blame]
// Copyright 2012 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/pepper/browser_ppapi_host_impl.h"
#include "base/observer_list.h"
#include "content/common/pepper_renderer_instance_data.h"
#include "content/public/common/process_type.h"
#include "ipc/ipc_message_macros.h"
#include "ppapi/proxy/ppapi_messages.h"
namespace content {
// static
BrowserPpapiHost* BrowserPpapiHost::CreateExternalPluginProcess(
IPC::Sender* sender,
ppapi::PpapiPermissions permissions,
base::Process plugin_child_process,
IPC::ChannelProxy* channel,
const base::FilePath& profile_directory) {
// The plugin name and path shouldn't be needed for external plugins.
BrowserPpapiHostImpl* browser_ppapi_host =
new BrowserPpapiHostImpl(sender,
permissions,
std::string(),
base::FilePath(),
profile_directory,
false /* in_process */,
true /* external_plugin */);
browser_ppapi_host->set_plugin_process(std::move(plugin_child_process));
channel->AddFilter(browser_ppapi_host->message_filter().get());
return browser_ppapi_host;
}
BrowserPpapiHostImpl::BrowserPpapiHostImpl(
IPC::Sender* sender,
const ppapi::PpapiPermissions& permissions,
const std::string& plugin_name,
const base::FilePath& plugin_path,
const base::FilePath& profile_data_directory,
bool in_process,
bool external_plugin)
: ppapi_host_(new ppapi::host::PpapiHost(sender, permissions)),
plugin_name_(plugin_name),
plugin_path_(plugin_path),
profile_data_directory_(profile_data_directory),
in_process_(in_process),
external_plugin_(external_plugin) {
message_filter_ = new HostMessageFilter(ppapi_host_.get(), this);
ppapi_host_->AddHostFactoryFilter(std::unique_ptr<ppapi::host::HostFactory>(
new ContentBrowserPepperHostFactory(this)));
}
BrowserPpapiHostImpl::~BrowserPpapiHostImpl() {
// Notify the filter so it won't foward messages to us.
message_filter_->OnHostDestroyed();
// Notify instance observers about our impending destruction.
for (auto& instance_data : instance_map_) {
for (auto& observer : instance_data.second->observer_list)
observer.OnHostDestroyed();
}
// Delete the host explicitly first. This shutdown will destroy the
// resources, which may want to do cleanup in their destructors and expect
// their pointers to us to be valid.
ppapi_host_.reset();
}
ppapi::host::PpapiHost* BrowserPpapiHostImpl::GetPpapiHost() {
return ppapi_host_.get();
}
const base::Process& BrowserPpapiHostImpl::GetPluginProcess() {
// Handle should previously have been set before use.
DCHECK(in_process_ || plugin_process_.IsValid());
return plugin_process_;
}
bool BrowserPpapiHostImpl::IsValidInstance(PP_Instance instance) {
return instance_map_.find(instance) != instance_map_.end();
}
bool BrowserPpapiHostImpl::GetRenderFrameIDsForInstance(PP_Instance instance,
int* render_process_id,
int* render_frame_id) {
auto it = instance_map_.find(instance);
if (it == instance_map_.end()) {
*render_process_id = 0;
*render_frame_id = 0;
return false;
}
*render_process_id = it->second->renderer_data.render_process_id;
*render_frame_id = it->second->renderer_data.render_frame_id;
return true;
}
const std::string& BrowserPpapiHostImpl::GetPluginName() {
return plugin_name_;
}
const base::FilePath& BrowserPpapiHostImpl::GetPluginPath() {
return plugin_path_;
}
const base::FilePath& BrowserPpapiHostImpl::GetProfileDataDirectory() {
return profile_data_directory_;
}
GURL BrowserPpapiHostImpl::GetDocumentURLForInstance(PP_Instance instance) {
auto it = instance_map_.find(instance);
if (it == instance_map_.end())
return GURL();
return it->second->renderer_data.document_url;
}
GURL BrowserPpapiHostImpl::GetPluginURLForInstance(PP_Instance instance) {
auto it = instance_map_.find(instance);
if (it == instance_map_.end())
return GURL();
return it->second->renderer_data.plugin_url;
}
bool BrowserPpapiHostImpl::IsPotentiallySecurePluginContext(
PP_Instance instance) {
auto it = instance_map_.find(instance);
if (it == instance_map_.end())
return false;
return it->second->renderer_data.is_potentially_secure_plugin_context;
}
void BrowserPpapiHostImpl::AddInstance(
PP_Instance instance,
const PepperRendererInstanceData& renderer_instance_data) {
// NOTE: 'instance' may be coming from a compromised renderer process. We
// take care here to make sure an attacker can't overwrite data for an
// existing plugin instance.
// See http://crbug.com/733548.
if (instance_map_.find(instance) == instance_map_.end()) {
instance_map_[instance] =
std::make_unique<InstanceData>(renderer_instance_data);
} else {
NOTREACHED_IN_MIGRATION();
}
}
void BrowserPpapiHostImpl::DeleteInstance(PP_Instance instance) {
// NOTE: 'instance' may be coming from a compromised renderer process. We
// take care here to make sure an attacker can't cause a UAF by deleting a
// non-existent plugin instance.
// See http://crbug.com/733548.
auto it = instance_map_.find(instance);
if (it != instance_map_.end()) {
// We need to tell the observers for that instance that we are destroyed
// because we won't have the opportunity to once we remove them from the
// |instance_map_|. If the instance was deleted, observers for those
// instances should never call back into the host anyway, so it is safe to
// tell them that the host is destroyed.
for (auto& observer : it->second->observer_list)
observer.OnHostDestroyed();
instance_map_.erase(it);
} else {
NOTREACHED_IN_MIGRATION();
}
}
void BrowserPpapiHostImpl::AddInstanceObserver(PP_Instance instance,
InstanceObserver* observer) {
instance_map_[instance]->observer_list.AddObserver(observer);
}
void BrowserPpapiHostImpl::RemoveInstanceObserver(PP_Instance instance,
InstanceObserver* observer) {
auto it = instance_map_.find(instance);
if (it != instance_map_.end())
it->second->observer_list.RemoveObserver(observer);
}
BrowserPpapiHostImpl::HostMessageFilter::HostMessageFilter(
ppapi::host::PpapiHost* ppapi_host,
BrowserPpapiHostImpl* browser_ppapi_host_impl)
: ppapi_host_(ppapi_host),
browser_ppapi_host_impl_(browser_ppapi_host_impl) {}
bool BrowserPpapiHostImpl::HostMessageFilter::OnMessageReceived(
const IPC::Message& msg) {
// Don't forward messages if our owner object has been destroyed.
if (!ppapi_host_)
return false;
return ppapi_host_->OnMessageReceived(msg);
}
void BrowserPpapiHostImpl::HostMessageFilter::OnHostDestroyed() {
DCHECK(ppapi_host_);
ppapi_host_ = nullptr;
browser_ppapi_host_impl_ = nullptr;
}
BrowserPpapiHostImpl::HostMessageFilter::~HostMessageFilter() {}
BrowserPpapiHostImpl::InstanceData::InstanceData(
const PepperRendererInstanceData& renderer_data)
: renderer_data(renderer_data) {}
BrowserPpapiHostImpl::InstanceData::~InstanceData() {
}
} // namespace content