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// 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 "net/proxy_resolution/win/proxy_config_service_win.h"
#include <windows.h>
#include <winhttp.h>
#include <algorithm>
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/strings/utf_string_conversions.h"
#include "base/threading/thread_restrictions.h"
#include "base/win/registry.h"
#include "base/win/scoped_handle.h"
#include "net/base/net_errors.h"
namespace net {
namespace {
const int kPollIntervalSec = 10;
void FreeIEConfig(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG* ie_config) {
if (ie_config->lpszAutoConfigUrl) {
GlobalFree(ie_config->lpszAutoConfigUrl);
}
if (ie_config->lpszProxy) {
GlobalFree(ie_config->lpszProxy);
}
if (ie_config->lpszProxyBypass) {
GlobalFree(ie_config->lpszProxyBypass);
}
}
} // namespace
ProxyConfigServiceWin::ProxyConfigServiceWin(
const NetworkTrafficAnnotationTag& traffic_annotation)
: PollingProxyConfigService(
base::Seconds(kPollIntervalSec),
base::BindRepeating(&ProxyConfigServiceWin::GetCurrentProxyConfig),
traffic_annotation) {
NetworkChangeNotifier::AddNetworkChangeObserver(this);
}
ProxyConfigServiceWin::~ProxyConfigServiceWin() {
NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
// The registry functions below will end up going to disk. TODO: Do this on
// another thread to avoid slowing the current thread. http://crbug.com/61453
base::ScopedAllowBlocking scoped_allow_blocking;
keys_to_watch_.clear();
}
void ProxyConfigServiceWin::AddObserver(Observer* observer) {
// Lazily-initialize our registry watcher.
StartWatchingRegistryForChanges();
// Let the super-class do its work now.
PollingProxyConfigService::AddObserver(observer);
}
void ProxyConfigServiceWin::OnNetworkChanged(
NetworkChangeNotifier::ConnectionType type) {
// Proxy settings on Windows may change when the active connection changes.
// For instance, after connecting to a VPN, the proxy settings for the active
// connection will be that for the VPN. (And ProxyConfigService only reports
// proxy settings for the default connection).
// This is conditioned on CONNECTION_NONE to avoid duplicating work, as
// NetworkChangeNotifier additionally sends it preceding completion.
// See https://crbug.com/1071901.
if (type == NetworkChangeNotifier::CONNECTION_NONE) {
CheckForChangesNow();
}
}
void ProxyConfigServiceWin::StartWatchingRegistryForChanges() {
if (!keys_to_watch_.empty()) {
return; // Already initialized.
}
// The registry functions below will end up going to disk. Do this on another
// thread to avoid slowing the current thread. http://crbug.com/61453
base::ScopedAllowBlocking scoped_allow_blocking;
// There are a number of different places where proxy settings can live
// in the registry. In some cases it appears in a binary value, in other
// cases string values. Furthermore winhttp and wininet appear to have
// separate stores, and proxy settings can be configured per-machine
// or per-user.
//
// This function is probably not exhaustive in the registry locations it
// watches for changes, however it should catch the majority of the
// cases. In case we have missed some less common triggers (likely), we
// will catch them during the periodic (10 second) polling, so things
// will recover.
AddKeyToWatchList(
HKEY_CURRENT_USER,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
AddKeyToWatchList(
HKEY_LOCAL_MACHINE,
L"Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings");
AddKeyToWatchList(HKEY_LOCAL_MACHINE,
L"SOFTWARE\\Policies\\Microsoft\\Windows\\CurrentVersion\\"
L"Internet Settings");
}
bool ProxyConfigServiceWin::AddKeyToWatchList(HKEY rootkey,
const wchar_t* subkey) {
std::unique_ptr<base::win::RegKey> key =
std::make_unique<base::win::RegKey>();
if (key->Create(rootkey, subkey, KEY_NOTIFY) != ERROR_SUCCESS) {
return false;
}
if (!key->StartWatching(base::BindOnce(
&ProxyConfigServiceWin::OnObjectSignaled, base::Unretained(this),
base::Unretained(key.get())))) {
return false;
}
keys_to_watch_.push_back(std::move(key));
return true;
}
void ProxyConfigServiceWin::OnObjectSignaled(base::win::RegKey* key) {
// Figure out which registry key signalled this change.
auto it = std::ranges::find(keys_to_watch_, key,
&std::unique_ptr<base::win::RegKey>::get);
CHECK(it != keys_to_watch_.end());
// Keep watching the registry key.
if (!key->StartWatching(
base::BindOnce(&ProxyConfigServiceWin::OnObjectSignaled,
base::Unretained(this), base::Unretained(key)))) {
keys_to_watch_.erase(it);
}
// Have the PollingProxyConfigService test for changes.
CheckForChangesNow();
}
// static
void ProxyConfigServiceWin::GetCurrentProxyConfig(
const NetworkTrafficAnnotationTag traffic_annotation,
ProxyConfigWithAnnotation* config) {
WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ie_config = {0};
if (!WinHttpGetIEProxyConfigForCurrentUser(&ie_config)) {
LOG(ERROR) << "WinHttpGetIEProxyConfigForCurrentUser failed: "
<< GetLastError();
*config = ProxyConfigWithAnnotation::CreateDirect();
return;
}
ProxyConfig proxy_config;
SetFromIEConfig(&proxy_config, ie_config);
FreeIEConfig(&ie_config);
proxy_config.set_from_system(true);
*config = ProxyConfigWithAnnotation(proxy_config, traffic_annotation);
}
// static
void ProxyConfigServiceWin::SetFromIEConfig(
ProxyConfig* config,
const WINHTTP_CURRENT_USER_IE_PROXY_CONFIG& ie_config) {
if (ie_config.fAutoDetect) {
config->set_auto_detect(true);
}
if (ie_config.lpszProxy) {
// lpszProxy may be a single proxy, or a proxy per scheme. The format
// is compatible with ProxyConfig::ProxyRules's string format.
config->proxy_rules().ParseFromString(
base::WideToUTF8(ie_config.lpszProxy));
}
if (ie_config.lpszProxyBypass) {
std::string proxy_bypass = base::WideToUTF8(ie_config.lpszProxyBypass);
base::StringTokenizer proxy_server_bypass_list(proxy_bypass, ";, \t\n\r");
while (proxy_server_bypass_list.GetNext()) {
std::string bypass_url_domain = proxy_server_bypass_list.token();
config->proxy_rules().bypass_rules.AddRuleFromString(bypass_url_domain);
}
}
if (ie_config.lpszAutoConfigUrl) {
config->set_pac_url(GURL(base::as_u16cstr(ie_config.lpszAutoConfigUrl)));
}
}
} // namespace net
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