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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/command_line.h"
#include "chrome/browser/policy/policy_test_utils.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/metrics/content/subprocess_metrics_provider.h"
#include "components/network_session_configurator/common/network_switches.h"
#include "components/permissions/permission_request_manager.h"
#include "components/permissions/test/mock_permission_prompt_factory.h"
#include "components/policy/policy_constants.h"
#include "content/public/browser/web_contents.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/content_browser_test_utils.h"
#include "net/dns/mock_host_resolver.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "net/test/test_data_directory.h"
#include "services/network/public/cpp/features.h"
#include "third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom.h"
// Path to a response that passes Local Network Access checks.
constexpr char kLnaPath[] =
"/set-header"
"?Access-Control-Allow-Origin: *";
class LocalNetworkAccessBrowserTest : public policy::PolicyTest {
public:
using WebFeature = blink::mojom::WebFeature;
LocalNetworkAccessBrowserTest()
: https_server_(net::EmbeddedTestServer::TYPE_HTTPS) {
// Some builders run with field_trial disabled, need to enable this
// manually.
features_.InitAndEnableFeature(
network::features::kLocalNetworkAccessChecks);
}
content::WebContents* web_contents() const {
return browser()->tab_strip_model()->GetActiveWebContents();
}
net::EmbeddedTestServer& https_server() { return https_server_; }
// Fetch the Blink.UseCounter.Features histogram in every renderer process
// until reaching, but not exceeding, |expected_count|.
void CheckCounter(WebFeature feature, int expected_count) {
CheckHistogramCount("Blink.UseCounter.Features", feature, expected_count);
}
// Fetch the |histogram|'s |bucket| in every renderer process until reaching,
// but not exceeding, |expected_count|.
template <typename T>
void CheckHistogramCount(std::string_view histogram,
T bucket,
int expected_count) {
while (true) {
content::FetchHistogramsFromChildProcesses();
metrics::SubprocessMetricsProvider::MergeHistogramDeltasForTesting();
int count = histogram_.GetBucketCount(histogram, bucket);
CHECK_LE(count, expected_count);
if (count == expected_count) {
return;
}
base::RunLoop run_loop;
base::SequencedTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE, run_loop.QuitClosure(), base::Milliseconds(1));
run_loop.Run();
}
}
protected:
void SetUpOnMainThread() override {
host_resolver()->AddRule("*", "127.0.0.1");
https_server_.AddDefaultHandlers(GetChromeTestDataDir());
https_server_.SetSSLConfig(net::EmbeddedTestServer::CERT_OK);
ASSERT_TRUE(https_server_.Start());
EXPECT_TRUE(content::NavigateToURL(web_contents(), GURL("about:blank")));
}
private:
void SetUpCommandLine(base::CommandLine* command_line) final {
// Ignore cert errors when connecting to https_server()
command_line->AppendSwitch(switches::kIgnoreCertificateErrors);
}
net::EmbeddedTestServer https_server_;
base::test::ScopedFeatureList features_;
base::HistogramTester histogram_;
};
IN_PROC_BROWSER_TEST_F(LocalNetworkAccessBrowserTest,
CheckSecurityStateDefaultPolicy) {
ASSERT_TRUE(content::NavigateToURL(
web_contents(),
https_server().GetURL(
"a.com",
"/private_network_access/no-favicon-treat-as-public-address.html")));
// LNA fetch should pass (default is currently in warning mode).
ASSERT_EQ(true,
content::EvalJs(
web_contents(),
content::JsReplace("fetch($1).then(response => response.ok)",
https_server().GetURL("b.com", kLnaPath))));
}
IN_PROC_BROWSER_TEST_F(LocalNetworkAccessBrowserTest,
CheckSecurityStatePolicySet) {
policy::PolicyMap policies;
SetPolicy(&policies, policy::key::kLocalNetworkAccessRestrictionsEnabled,
std::optional<base::Value>(true));
UpdateProviderPolicy(policies);
ASSERT_TRUE(content::NavigateToURL(
web_contents(),
https_server().GetURL(
"a.com",
"/private_network_access/no-favicon-treat-as-public-address.html")));
permissions::PermissionRequestManager* manager =
permissions::PermissionRequestManager::FromWebContents(web_contents());
std::unique_ptr<permissions::MockPermissionPromptFactory> bubble_factory =
std::make_unique<permissions::MockPermissionPromptFactory>(manager);
// Enable auto-denial of LNA permission request.
bubble_factory->set_response_type(
permissions::PermissionRequestManager::AutoResponseType::DENY_ALL);
// Expect LNA fetch to fail.
EXPECT_THAT(content::EvalJs(
web_contents(),
content::JsReplace("fetch($1).then(response => response.ok)",
https_server().GetURL("b.com", kLnaPath))),
content::EvalJsResult::IsError());
}
IN_PROC_BROWSER_TEST_F(LocalNetworkAccessBrowserTest,
CheckPrivateAliasFeatureCounter) {
ASSERT_TRUE(content::NavigateToURL(
web_contents(),
https_server().GetURL(
"a.com",
"/private_network_access/no-favicon-treat-as-public-address.html")));
// LNA fetch fails due to mismatched targetAddressSpace. Result doesn't matter
// here though, as we're just checking a use counter that doesn't depend on
// fetch success.
EXPECT_THAT(content::EvalJs(web_contents(),
content::JsReplace(
"fetch($1, {targetAddressSpace: "
"'private'}).then(response => response.ok)",
https_server().GetURL("b.com", kLnaPath))),
content::EvalJsResult::IsError());
CheckCounter(WebFeature::kLocalNetworkAccessPrivateAliasUse, 1);
}
IN_PROC_BROWSER_TEST_F(LocalNetworkAccessBrowserTest,
CheckPrivateAliasFeatureCounterLocalNotCounted) {
ASSERT_TRUE(content::NavigateToURL(
web_contents(),
https_server().GetURL(
"a.com",
"/private_network_access/no-favicon-treat-as-public-address.html")));
// LNA fetch fails due to mismatched targetAddressSpace. Result doesn't matter
// here though, as we're just checking a use counter that doesn't depend on
// fetch success.
EXPECT_THAT(content::EvalJs(
web_contents(),
content::JsReplace("fetch($1, {targetAddressSpace: "
"'local'}).then(response => response.ok)",
https_server().GetURL("b.com", kLnaPath))),
content::EvalJsResult::IsError());
CheckCounter(WebFeature::kLocalNetworkAccessPrivateAliasUse, 0);
}
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