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
|
// Copyright 2020 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/ash/plugin_vm/plugin_vm_license_checker.h"
#include <cstddef>
#include <string_view>
#include "base/functional/callback_helpers.h"
#include "base/json/json_reader.h"
#include "base/json/json_writer.h"
#include "base/metrics/histogram_functions.h"
#include "base/strings/strcat.h"
#include "base/time/time.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/signin/identity_manager_factory.h"
#include "components/signin/public/base/consent_level.h"
#include "components/signin/public/identity_manager/access_token_info.h"
#include "components/signin/public/identity_manager/account_info.h"
#include "components/signin/public/identity_manager/identity_manager.h"
#include "components/signin/public/identity_manager/scope_set.h"
#include "components/user_manager/user.h"
#include "components/user_manager/user_manager.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "net/base/load_flags.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_status_code.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
namespace plugin_vm {
namespace {
constexpr char kValidationOAuth2Scope[] =
"https://www.googleapis.com/auth/applicense.bytebot";
constexpr char kValidationEndpoint[] = "https://bytebot.googleapis.com/";
constexpr char kValidationServicePath[] =
"v1/applications/chromePluginVm:getLicenseStatus";
constexpr char kValidationServiceQuery[] = "?checkOnly=true&access_token=";
constexpr size_t kResponseMaxBodySize = 4 * 1024 * 1024; // 4 MiB
const GURL GetValidationEndpoint() {
return GURL(base::StrCat(
{kValidationEndpoint, kValidationServicePath, kValidationServiceQuery}));
}
const net::NetworkTrafficAnnotationTag GetTrafficAnnotation() {
return net::DefineNetworkTrafficAnnotation("chrome_plugin_vm_api",
R"(
semantics {
sender: "Chrome Plugin VM License Checker"
description:
"Communication with the Plugin VM License Checker API to confirm "
"that the current managed user has a valid Plugin VM license."
trigger:
"The request is triggered when the system receives a PluginVmUserId."
data:
"The only transmitted information is an OAuth token. This "
"information is used to verify the Plugin VM license."
destination: GOOGLE_OWNED_SERVICE
}
policy {
setting:
"There is no setting"
cookies_allowed: NO
chrome_policy {
UserPluginVmAllowed {
UserPluginVmAllowed: false
}
}
}
)");
}
// Response Codes that indicate we don't need to evaluate the response body.
bool IsEarlyResponseCode(int response_code) {
// A 5XX code indicates a server issue, we will assume the license is valid
// and a later check during installation will validate the license.
return response_code >= 500 && response_code < 600;
}
// Response codes that indicate that we can return success.
bool IsAcceptedResponseCode(int response_code) {
return (response_code >= 200 && response_code < 300) ||
IsEarlyResponseCode(response_code);
}
// A valid license will response with a 2XX code with an ACTIVE status in the
// body.
bool ResponseIndicatesValidLicense(int response_code,
std::string response_body) {
if (!IsAcceptedResponseCode(response_code)) {
LOG(ERROR) << "Unable to validate license due to response code: "
<< response_code;
return false;
}
if (IsEarlyResponseCode(response_code))
return true;
// Expected response body:
// { "status": "ACTIVE", ...}
std::optional<base::Value::Dict> response =
base::JSONReader::ReadDict(response_body);
if (!response) {
LOG(ERROR) << "response_body was of unexpected format.";
return false;
}
std::string* status = response->FindString("status");
if (!status) {
LOG(ERROR) << "response_body did not contain status.";
return false;
}
return *status == "ACTIVE";
}
} // namespace
PluginVmLicenseChecker::PluginVmLicenseChecker(Profile* profile)
: profile_(profile),
validation_url_(GetValidationEndpoint()),
traffic_annotation_(GetTrafficAnnotation()) {
DCHECK(profile_);
}
PluginVmLicenseChecker::~PluginVmLicenseChecker() = default;
void PluginVmLicenseChecker::CheckLicense(LicenseCheckedCallback callback) {
DCHECK(!callback_);
callback_ = std::move(callback);
DCHECK(!profile_->IsOffTheRecord());
url_loader_factory_ = profile_->GetURLLoaderFactory();
DCHECK(url_loader_factory_);
FetchAccessToken();
}
void PluginVmLicenseChecker::FetchAccessToken() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
signin::IdentityManager* identity_manager =
IdentityManagerFactory::GetForProfile(profile_);
DCHECK(identity_manager);
signin::ScopeSet validation_scope;
validation_scope.insert(kValidationOAuth2Scope);
token_fetcher_ = std::make_unique<signin::PrimaryAccountAccessTokenFetcher>(
"ChromePluginVm", identity_manager, validation_scope,
base::BindOnce(&PluginVmLicenseChecker::CallEndpointWithAccessToken,
weak_ptr_factory_.GetWeakPtr()),
signin::PrimaryAccountAccessTokenFetcher::Mode::kImmediate,
signin::ConsentLevel::kSync);
}
void PluginVmLicenseChecker::CallEndpointWithAccessToken(
GoogleServiceAuthError error,
signin::AccessTokenInfo access_token_info) {
token_fetcher_.reset();
if (error.state() != GoogleServiceAuthError::NONE) {
LOG(ERROR) << "Encountered GoogleServiceAuthError while attempting to"
<< " fetch OAuth2 access token. Error Info: "
<< error.ToString();
std::move(callback_).Run(false);
return;
}
std::unique_ptr<network::ResourceRequest> resource_request =
CreateResourceRequest(access_token_info.token);
simple_url_loader_ = network::SimpleURLLoader::Create(
std::move(resource_request), traffic_annotation_);
simple_url_loader_->SetAllowHttpErrorResults(true);
simple_url_loader_->DownloadToString(
url_loader_factory_.get(),
base::BindOnce(&PluginVmLicenseChecker::HandleStringResponse,
weak_ptr_factory_.GetWeakPtr()),
kResponseMaxBodySize);
}
std::unique_ptr<network::ResourceRequest>
PluginVmLicenseChecker::CreateResourceRequest(std::string_view access_token) {
auto resource_request = std::make_unique<network::ResourceRequest>();
resource_request->url =
GURL(base::StrCat({validation_url_.spec(), access_token}));
resource_request->load_flags = net::LOAD_DISABLE_CACHE;
resource_request->credentials_mode = network::mojom::CredentialsMode::kOmit;
resource_request->method = "GET";
return resource_request;
}
void PluginVmLicenseChecker::HandleStringResponse(
std::unique_ptr<std::string> response_body) {
if (!simple_url_loader_->ResponseInfo() ||
!simple_url_loader_->ResponseInfo()->headers) {
LOG(ERROR) << "Did not recieve a response from server while attempting to"
<< " validate the license.";
std::move(callback_).Run(false);
return;
}
int response_code =
simple_url_loader_->ResponseInfo()->headers->response_code();
std::move(callback_).Run(
ResponseIndicatesValidLicense(response_code, *response_body));
}
} // namespace plugin_vm
|
