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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/installer/util/advanced_firewall_manager_win.h"
#include <objbase.h>
#include <stddef.h>
#include "base/check_op.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions_win.h"
#include "base/strings/utf_string_conversions.h"
#include "base/uuid.h"
#include "base/win/scoped_bstr.h"
#include "base/win/scoped_variant.h"
namespace installer {
AdvancedFirewallManager::AdvancedFirewallManager() = default;
AdvancedFirewallManager::~AdvancedFirewallManager() = default;
bool AdvancedFirewallManager::Init(const std::wstring& app_name,
const base::FilePath& app_path) {
firewall_rules_ = nullptr;
HRESULT hr = ::CoCreateInstance(CLSID_NetFwPolicy2, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&firewall_policy_));
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
firewall_policy_ = nullptr;
return false;
}
hr = firewall_policy_->get_Rules(&firewall_rules_);
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
firewall_rules_ = nullptr;
return false;
}
app_name_ = app_name;
app_path_ = app_path;
return true;
}
bool AdvancedFirewallManager::IsFirewallEnabled() {
long profile_types = 0;
HRESULT hr = firewall_policy_->get_CurrentProfileTypes(&profile_types);
if (FAILED(hr))
return false;
// The most-restrictive active profile takes precedence.
const NET_FW_PROFILE_TYPE2 kProfileTypes[] = {
NET_FW_PROFILE2_PUBLIC, NET_FW_PROFILE2_PRIVATE, NET_FW_PROFILE2_DOMAIN};
for (size_t i = 0; i < std::size(kProfileTypes); ++i) {
if ((profile_types & kProfileTypes[i]) != 0) {
VARIANT_BOOL enabled = VARIANT_TRUE;
hr = firewall_policy_->get_FirewallEnabled(kProfileTypes[i], &enabled);
// Assume the firewall is enabled if we can't determine.
if (FAILED(hr) || enabled != VARIANT_FALSE)
return true;
}
}
return false;
}
bool AdvancedFirewallManager::HasAnyRule() {
std::vector<Microsoft::WRL::ComPtr<INetFwRule>> rules;
GetAllRules(&rules);
return !rules.empty();
}
bool AdvancedFirewallManager::AddUDPRule(const std::wstring& rule_name,
const std::wstring& description,
uint16_t port) {
// Delete the rule. According MDSN |INetFwRules::Add| should replace rule with
// same "rule identifier". It's not clear what is "rule identifier", but it
// can successfully create many rule with same name.
DeleteRuleByName(rule_name);
// Create the rule and add it to the rule set (only succeeds if elevated).
Microsoft::WRL::ComPtr<INetFwRule> udp_rule =
CreateUDPRule(rule_name, description, port);
if (!udp_rule.Get())
return false;
HRESULT hr = firewall_rules_->Add(udp_rule.Get());
DLOG_IF(ERROR, FAILED(hr)) << logging::SystemErrorCodeToString(hr);
return SUCCEEDED(hr);
}
void AdvancedFirewallManager::DeleteRuleByName(const std::wstring& rule_name) {
std::vector<Microsoft::WRL::ComPtr<INetFwRule>> rules;
GetAllRules(&rules);
for (size_t i = 0; i < rules.size(); ++i) {
base::win::ScopedBstr name;
HRESULT hr = rules[i]->get_Name(name.Receive());
if (SUCCEEDED(hr) && name.Get() && std::wstring(name.Get()) == rule_name) {
DeleteRule(rules[i]);
}
}
}
void AdvancedFirewallManager::DeleteRule(
Microsoft::WRL::ComPtr<INetFwRule> rule) {
// Rename rule to unique name and delete by unique name. We can't just delete
// rule by name. Multiple rules with the same name and different app are
// possible.
base::win::ScopedBstr unique_name(
base::ASCIIToWide(base::Uuid::GenerateRandomV4().AsLowercaseString()));
rule->put_Name(unique_name.Get());
firewall_rules_->Remove(unique_name.Get());
}
void AdvancedFirewallManager::DeleteAllRules() {
std::vector<Microsoft::WRL::ComPtr<INetFwRule>> rules;
GetAllRules(&rules);
for (size_t i = 0; i < rules.size(); ++i) {
DeleteRule(rules[i]);
}
}
Microsoft::WRL::ComPtr<INetFwRule> AdvancedFirewallManager::CreateUDPRule(
const std::wstring& rule_name,
const std::wstring& description,
uint16_t port) {
Microsoft::WRL::ComPtr<INetFwRule> udp_rule;
HRESULT hr = ::CoCreateInstance(CLSID_NetFwRule, nullptr, CLSCTX_ALL,
IID_PPV_ARGS(&udp_rule));
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
return Microsoft::WRL::ComPtr<INetFwRule>();
}
udp_rule->put_Name(base::win::ScopedBstr(rule_name).Get());
udp_rule->put_Description(base::win::ScopedBstr(description).Get());
udp_rule->put_ApplicationName(base::win::ScopedBstr(app_path_.value()).Get());
udp_rule->put_Protocol(NET_FW_IP_PROTOCOL_UDP);
udp_rule->put_Direction(NET_FW_RULE_DIR_IN);
udp_rule->put_Enabled(VARIANT_TRUE);
udp_rule->put_LocalPorts(
base::win::ScopedBstr(base::NumberToWString(port)).Get());
udp_rule->put_Grouping(base::win::ScopedBstr(app_name_).Get());
udp_rule->put_Profiles(NET_FW_PROFILE2_ALL);
udp_rule->put_Action(NET_FW_ACTION_ALLOW);
return udp_rule;
}
void AdvancedFirewallManager::GetAllRules(
std::vector<Microsoft::WRL::ComPtr<INetFwRule>>* rules) {
Microsoft::WRL::ComPtr<IUnknown> rules_enum_unknown;
HRESULT hr = firewall_rules_->get__NewEnum(&rules_enum_unknown);
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
return;
}
Microsoft::WRL::ComPtr<IEnumVARIANT> rules_enum;
hr = rules_enum_unknown.As(&rules_enum);
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
return;
}
for (;;) {
base::win::ScopedVariant rule_var;
hr = rules_enum->Next(1, rule_var.Receive(), nullptr);
DLOG_IF(ERROR, FAILED(hr)) << logging::SystemErrorCodeToString(hr);
if (hr != S_OK)
break;
DCHECK_EQ(VT_DISPATCH, rule_var.type());
if (VT_DISPATCH != rule_var.type()) {
DLOG(ERROR) << "Unexpected type";
continue;
}
Microsoft::WRL::ComPtr<INetFwRule> rule;
hr = V_DISPATCH(rule_var.ptr())->QueryInterface(IID_PPV_ARGS(&rule));
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
continue;
}
base::win::ScopedBstr path;
hr = rule->get_ApplicationName(path.Receive());
if (FAILED(hr)) {
DLOG(ERROR) << logging::SystemErrorCodeToString(hr);
continue;
}
if (!path.Get() || !base::FilePath::CompareEqualIgnoreCase(
path.Get(), app_path_.value())) {
continue;
}
rules->push_back(rule);
}
}
} // namespace installer
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