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// 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/serial/serial_policy_allowed_ports.h"
#include <optional>
#include <vector>
#include "base/containers/contains.h"
#include "base/functional/bind.h"
#include "base/values.h"
#include "chrome/common/pref_names.h"
#include "components/pref_registry/pref_registry_syncable.h"
#include "components/prefs/pref_service.h"
#include "services/device/public/mojom/serial.mojom.h"
#include "url/gurl.h"
namespace {
constexpr char kPrefDevicesKey[] = "devices";
constexpr char kPrefUrlsKey[] = "urls";
constexpr char kPrefVendorIdKey[] = "vendor_id";
constexpr char kPrefProductIdKey[] = "product_id";
} // namespace
SerialPolicyAllowedPorts::SerialPolicyAllowedPorts(PrefService* pref_service) {
pref_change_registrar_.Init(pref_service);
// The lifetime of |pref_change_registrar_| is managed by this class so it is
// safe to use base::Unretained() here.
pref_change_registrar_.Add(
prefs::kManagedSerialAllowAllPortsForUrls,
base::BindRepeating(
&SerialPolicyAllowedPorts::LoadAllowAllPortsForUrlsPolicy,
base::Unretained(this)));
pref_change_registrar_.Add(
prefs::kManagedSerialAllowUsbDevicesForUrls,
base::BindRepeating(
&SerialPolicyAllowedPorts::LoadAllowUsbDevicesForUrlsPolicy,
base::Unretained(this)));
LoadAllowAllPortsForUrlsPolicy();
LoadAllowUsbDevicesForUrlsPolicy();
}
SerialPolicyAllowedPorts::~SerialPolicyAllowedPorts() = default;
// static
void SerialPolicyAllowedPorts::RegisterPrefs(PrefRegistrySimple* registry) {
registry->RegisterListPref(prefs::kManagedSerialAllowAllPortsForUrls);
registry->RegisterListPref(prefs::kManagedSerialAllowUsbDevicesForUrls);
}
bool SerialPolicyAllowedPorts::HasPortPermission(
const url::Origin& origin,
const device::mojom::SerialPortInfo& port_info) {
if (base::Contains(all_ports_policy_, origin)) {
return true;
}
if (port_info.has_vendor_id) {
auto it = usb_vendor_policy_.find(port_info.vendor_id);
if (it != usb_vendor_policy_.end() && base::Contains(it->second, origin)) {
return true;
}
}
if (port_info.has_vendor_id && port_info.has_product_id) {
auto it = usb_device_policy_.find(
std::make_pair(port_info.vendor_id, port_info.product_id));
if (it != usb_device_policy_.end() && base::Contains(it->second, origin)) {
return true;
}
}
return false;
}
void SerialPolicyAllowedPorts::LoadAllowAllPortsForUrlsPolicy() {
all_ports_policy_.clear();
const base::Value::List& pref_list = pref_change_registrar_.prefs()->GetList(
prefs::kManagedSerialAllowAllPortsForUrls);
// The pref value has already been validated by the policy handler, so it is
// safe to assume that |pref_value| follows the policy template.
std::vector<url::Origin> urls;
for (const auto& url_value : pref_list) {
GURL url(url_value.GetString());
if (!url.is_valid()) {
continue;
}
urls.push_back(url::Origin::Create(url));
}
all_ports_policy_.insert(urls.begin(), urls.end());
}
void SerialPolicyAllowedPorts::LoadAllowUsbDevicesForUrlsPolicy() {
usb_device_policy_.clear();
usb_vendor_policy_.clear();
const base::Value::List& pref_list = pref_change_registrar_.prefs()->GetList(
prefs::kManagedSerialAllowUsbDevicesForUrls);
// The pref value has already been validated by the policy handler, so it is
// safe to assume that |pref_value| follows the policy template.
for (const auto& item : pref_list) {
const base::Value::List* urls_value = item.GetDict().FindList(kPrefUrlsKey);
DCHECK(urls_value);
std::vector<url::Origin> urls;
for (const auto& url_value : *urls_value) {
GURL url(url_value.GetString());
if (!url.is_valid()) {
continue;
}
urls.push_back(url::Origin::Create(url));
}
if (urls.empty()) {
continue;
}
const base::Value::List* devices_value =
item.GetDict().FindList(kPrefDevicesKey);
DCHECK(devices_value);
for (const auto& port_value : *devices_value) {
const std::optional<int> vendor_id_value =
port_value.GetDict().FindInt(kPrefVendorIdKey);
DCHECK(vendor_id_value);
const std::optional<int> product_id_value =
port_value.GetDict().FindInt(kPrefProductIdKey);
// "product_id" is optional and the policy matches all devices with the
// given vendor ID if it is not specified.
if (product_id_value) {
usb_device_policy_[{*vendor_id_value, *product_id_value}].insert(
urls.begin(), urls.end());
} else {
usb_vendor_policy_[*vendor_id_value].insert(urls.begin(), urls.end());
}
}
}
}
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