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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/test/scoped_feature_list.h"
#include "base/values.h"
#include "chrome/browser/content_settings/cookie_settings_factory.h"
#include "chrome/browser/policy/policy_test_utils.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/common/pref_names.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "components/content_settings/core/browser/cookie_settings.h"
#include "components/content_settings/core/common/content_settings.h"
#include "components/policy/core/common/policy_map.h"
#include "components/policy/core/common/policy_types.h"
#include "components/policy/policy_constants.h"
#include "components/prefs/pref_service.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/test_navigation_observer.h"
#include "net/dns/mock_host_resolver.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "storage/browser/blob/features.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/common/switches.h"
#include "url/gurl.h"
namespace policy {
namespace {
GURL CreateBlobUrl(content::RenderFrameHost* rfh) {
std::string blob_url_string =
EvalJs(rfh,
"const blob_url = URL.createObjectURL(new "
" Blob(['<!doctype html><body>potato</body>'], {type: "
" 'text/html'}));"
"blob_url;")
.ExtractString();
return GURL(blob_url_string);
}
bool FetchAndReadBlobUrl(content::RenderFrameHost* rfh, const GURL& blob_url) {
return content::EvalJs(rfh,
content::JsReplace(
"async function test() {"
" try {"
" const blob = await "
" fetch($1).then(response => response.blob());"
" await blob.text();"
" return true;"
" } catch (e) {"
" return false;"
" }"
"}"
"test();",
blob_url))
.ExtractBool();
}
} // namespace
class PartitionedBlobUrlUsagePolicyBrowserTest : public policy::PolicyTest {
public:
PartitionedBlobUrlUsagePolicyBrowserTest() {
scoped_feature_list_.InitWithFeatures(
{features::kBlockCrossPartitionBlobUrlFetching,
blink::features::kEnforceNoopenerOnBlobURLNavigation},
{});
}
void SetUpOnMainThread() override {
PolicyTest::SetUpOnMainThread();
host_resolver()->AddRule("*", "127.0.0.1");
embedded_test_server()->ServeFilesFromSourceDirectory("content/test/data");
content::SetupCrossSiteRedirector(embedded_test_server());
ASSERT_TRUE(embedded_test_server()->Start());
}
void SetEnterprisePolicies(int enabled_value,
const std::vector<std::string>& origins) {
policy::PolicyMap policies;
policies.Set(policy::key::kPartitionedBlobUrlUsage,
policy::POLICY_LEVEL_MANDATORY, policy::POLICY_SCOPE_USER,
policy::POLICY_SOURCE_CLOUD, base::Value(true), nullptr);
policies.Set(policy::key::kDefaultThirdPartyStoragePartitioningSetting,
policy::POLICY_LEVEL_MANDATORY, policy::POLICY_SCOPE_USER,
policy::POLICY_SOURCE_CLOUD, base::Value(enabled_value),
nullptr);
base::Value::List blocked_origins;
for (const auto& origin : origins) {
blocked_origins.Append(origin);
}
policies.Set(policy::key::kThirdPartyStoragePartitioningBlockedForOrigins,
policy::POLICY_LEVEL_MANDATORY, policy::POLICY_SCOPE_USER,
policy::POLICY_SOURCE_CLOUD,
base::Value(std::move(blocked_origins)), nullptr);
UpdateProviderPolicy(policies);
}
private:
base::test::ScopedFeatureList scoped_feature_list_;
};
// When blob URL partitioning is enabled via feature flags and its enterprise
// policy, partitioning can still be disabled by the overarching third-party
// storage partitioning enterprise policies.
IN_PROC_BROWSER_TEST_F(
PartitionedBlobUrlUsagePolicyBrowserTest,
FetchingTestWithDefaultThirdPartyStoragePartitioningSetting) {
EXPECT_TRUE(base::FeatureList::IsEnabled(
features::kBlockCrossPartitionBlobUrlFetching));
SetEnterprisePolicies(ContentSetting::CONTENT_SETTING_BLOCK, {});
GURL main_url = embedded_test_server()->GetURL(
"c.com", "/cross_site_iframe_factory.html?c(b(c))");
content::WebContents* web_contents =
chrome_test_utils::GetActiveWebContents(this);
EXPECT_TRUE(content::NavigateToURL(web_contents, main_url));
content::RenderFrameHost* rfh_c = web_contents->GetPrimaryMainFrame();
GURL blob_url(CreateBlobUrl(rfh_c));
content::RenderFrameHost* rfh_b = content::ChildFrameAt(rfh_c, 0);
content::RenderFrameHost* rfh_c_2 = content::ChildFrameAt(rfh_b, 0);
EXPECT_TRUE(FetchAndReadBlobUrl(rfh_c_2, blob_url));
}
IN_PROC_BROWSER_TEST_F(
PartitionedBlobUrlUsagePolicyBrowserTest,
FetchingTestWithThirdPartyStoragePartitioningBlockedForOrigins) {
GURL main_url = embedded_test_server()->GetURL(
"c.com", "/cross_site_iframe_factory.html?c(b(c))");
SetEnterprisePolicies(
ContentSetting::CONTENT_SETTING_ALLOW, /*3PSP disabled for*/
{url::Origin::Create(main_url).Serialize()});
content::WebContents* web_contents =
chrome_test_utils::GetActiveWebContents(this);
EXPECT_TRUE(content::NavigateToURL(web_contents, main_url));
content::RenderFrameHost* rfh_c = web_contents->GetPrimaryMainFrame();
GURL blob_url(CreateBlobUrl(rfh_c));
content::RenderFrameHost* rfh_b = content::ChildFrameAt(rfh_c, 0);
content::RenderFrameHost* rfh_c_2 = content::ChildFrameAt(rfh_b, 0);
EXPECT_TRUE(FetchAndReadBlobUrl(rfh_c_2, blob_url));
}
class PartitionedBlobUrlUsagePolicyBrowserTestP
: public policy::PolicyTest,
public testing::WithParamInterface<bool> {
public:
PartitionedBlobUrlUsagePolicyBrowserTestP() {
scoped_feature_list_.InitWithFeatures(
{features::kBlockCrossPartitionBlobUrlFetching,
blink::features::kEnforceNoopenerOnBlobURLNavigation},
{});
}
void SetUpOnMainThread() override {
PolicyTest::SetUpOnMainThread();
host_resolver()->AddRule("*", "127.0.0.1");
embedded_test_server()->ServeFilesFromSourceDirectory("content/test/data");
content::SetupCrossSiteRedirector(embedded_test_server());
ASSERT_TRUE(embedded_test_server()->Start());
}
void SetUpInProcessBrowserTestFixture() override {
PolicyTest::SetUpInProcessBrowserTestFixture();
// The policy must be set in this function because if the policy is set in
// the test body the test fails because it seems that an existing renderer
// is re-used for which the command line flag hasn't been set.
SetEnterprisePolicies(GetParam());
}
void SetEnterprisePolicies(bool enabled) {
policy::PolicyMap policies;
policies.Set(policy::key::kPartitionedBlobUrlUsage,
policy::POLICY_LEVEL_MANDATORY, policy::POLICY_SCOPE_USER,
policy::POLICY_SOURCE_CLOUD, base::Value(enabled), nullptr);
UpdateProviderPolicy(policies);
}
bool IsPolicyEnabled() { return GetParam(); }
private:
base::test::ScopedFeatureList scoped_feature_list_;
};
IN_PROC_BROWSER_TEST_P(PartitionedBlobUrlUsagePolicyBrowserTestP,
FetchingPartitionedBlobUrlUsageEnterprisePolicy) {
EXPECT_TRUE(base::FeatureList::IsEnabled(
features::kBlockCrossPartitionBlobUrlFetching));
GURL main_url = embedded_test_server()->GetURL(
"c.com", "/cross_site_iframe_factory.html?c(b(c))");
content::WebContents* web_contents =
chrome_test_utils::GetActiveWebContents(this);
EXPECT_TRUE(content::NavigateToURL(web_contents, main_url));
content::RenderFrameHost* rfh_c = web_contents->GetPrimaryMainFrame();
GURL blob_url(CreateBlobUrl(rfh_c));
content::RenderFrameHost* rfh_b = content::ChildFrameAt(rfh_c, 0);
content::RenderFrameHost* rfh_c_2 = content::ChildFrameAt(rfh_b, 0);
// The default cookie setting to BLOCK here to ensure that the
// cross-origin blob URL fetch will be blocked due to lack of storage
// access. If cookies are allowed, storage access might be granted, and the
// fetch would succeed even if the blob URL is cross-origin and
// kBlockCrossPartitionBlobUrlFetching is enabled.
content_settings::CookieSettings* settings =
CookieSettingsFactory::GetForProfile(browser()->profile()).get();
settings->SetDefaultCookieSetting(CONTENT_SETTING_BLOCK);
bool fetch_results = FetchAndReadBlobUrl(rfh_c_2, blob_url);
if (IsPolicyEnabled()) {
EXPECT_FALSE(fetch_results);
} else {
EXPECT_TRUE(fetch_results);
}
}
IN_PROC_BROWSER_TEST_P(
PartitionedBlobUrlUsagePolicyBrowserTestP,
EnforcingNoopenerOnPartitionedBlobUrlUsageEnterprisePolicy) {
EXPECT_TRUE(base::FeatureList::IsEnabled(
blink::features::kEnforceNoopenerOnBlobURLNavigation));
// 1. navigate to c.com
GURL main_url = embedded_test_server()->GetURL("c.com", "/title1.html");
content::WebContents* web_contents =
chrome_test_utils::GetActiveWebContents(this);
EXPECT_TRUE(content::NavigateToURL(web_contents, main_url));
content::RenderFrameHost* rfh_c = web_contents->GetPrimaryMainFrame();
// 2. create blob_url in c.com (blob url origin is c.com)
GURL blob_url(CreateBlobUrl(rfh_c));
// 3. window.open b.com with c.com embedded
// 3a. navigate to b.com
GURL b_url = embedded_test_server()->GetURL(
"b.com", "/cross_site_iframe_factory.html?b(c)");
// 3b. open new tab from b.com context
ui_test_utils::TabAddedWaiter tab_waiter(browser());
EXPECT_TRUE(
content::ExecJs(rfh_c, content::JsReplace("window.open($1)", b_url)));
tab_waiter.Wait();
content::WebContents* tab_b =
browser()->tab_strip_model()->GetWebContentsAt(1);
ASSERT_NE(nullptr, tab_b) << "No tab found at index 1.";
content::TestNavigationObserver nav_observer(tab_b);
nav_observer.Wait();
content::RenderFrameHost* rfh_b = tab_b->GetPrimaryMainFrame();
content::RenderFrameHost* rfh_c_in_b = content::ChildFrameAt(rfh_b, 0);
// 4. do the window.open of blob url from c.com
ui_test_utils::TabAddedWaiter tab_waiter2(browser());
EXPECT_TRUE(rfh_c_in_b->IsRenderFrameLive());
EXPECT_TRUE(content::ExecJs(
rfh_c_in_b, content::JsReplace("handle = window.open($1);", blob_url)));
tab_waiter2.Wait();
bool handle_null = EvalJs(rfh_c_in_b, "handle === null;").ExtractBool();
tab_b->Close();
EXPECT_EQ(GetParam(), handle_null);
}
INSTANTIATE_TEST_SUITE_P(All,
PartitionedBlobUrlUsagePolicyBrowserTestP,
testing::Values(true, false));
} // namespace policy
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