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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/loader/http_equiv.h"
#include "third_party/blink/public/platform/web_content_settings_client.h"
#include "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/scriptable_document_parser.h"
#include "third_party/blink/renderer/core/frame/csp/content_security_policy.h"
#include "third_party/blink/renderer/core/frame/deprecation.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/inspector/console_message.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/loader/private/frame_client_hints_preferences_context.h"
#include "third_party/blink/renderer/core/origin_trials/origin_trial_context.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"
#include "third_party/blink/renderer/platform/loader/fetch/client_hints_preferences.h"
#include "third_party/blink/renderer/platform/network/http_names.h"
#include "third_party/blink/renderer/platform/network/http_parsers.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
#include "third_party/blink/renderer/platform/weborigin/reporting_disposition.h"
namespace blink {
namespace {
// Returns true if the origin of |url| is same as the origin of the top level
// frame's main resource.
bool IsFirstPartyOrigin(Frame* frame, const KURL& url) {
if (!frame)
return false;
return frame->Tree()
.Top()
.GetSecurityContext()
->GetSecurityOrigin()
->IsSameOriginWith(SecurityOrigin::Create(url).get());
}
// Returns true if execution of scripts from the url are allowed. Compared to
// AllowScriptFromSource(), this method does not generate any
// notification to the |ContentSettingsClient| that the execution of the
// script was blocked. This method should be called only when there is a need
// to check the settings, and where blocked setting doesn't really imply that
// JavaScript was blocked from being executed.
bool AllowScriptFromSourceWithoutNotifying(
const KURL& url,
WebContentSettingsClient* settings_client,
Settings* settings) {
bool allow_script = !settings || settings->GetScriptEnabled();
if (settings_client)
allow_script = settings_client->AllowScriptFromSource(allow_script, url);
return allow_script;
}
// Notifies content settings client of persistent client hint headers.
void NotifyPersistentClientHintsToContentSettingsClient(Document& document) {
base::TimeDelta persist_duration;
if (RuntimeEnabledFeatures::FeaturePolicyForClientHintsEnabled()) {
persist_duration = base::TimeDelta::Max();
} else {
persist_duration =
document.GetFrame()->GetClientHintsPreferences().GetPersistDuration();
}
if (persist_duration.InSeconds() <= 0)
return;
WebEnabledClientHints enabled_client_hints = document.GetFrame()
->GetClientHintsPreferences()
.GetWebEnabledClientHints();
if (!AllowScriptFromSourceWithoutNotifying(
document.Url(), document.GetFrame()->GetContentSettingsClient(),
document.GetFrame()->GetSettings())) {
// Do not persist client hint preferences if the JavaScript is disabled.
return;
}
if (!document.GetFrame()->IsMainFrame() &&
!IsFirstPartyOrigin(document.GetFrame(), document.Url())) {
return;
}
if (auto* settings_client = document.GetFrame()->GetContentSettingsClient()) {
settings_client->PersistClientHints(enabled_client_hints, persist_duration,
document.Url());
}
}
} // namespace
void HttpEquiv::Process(Document& document,
const AtomicString& equiv,
const AtomicString& content,
bool in_document_head_element,
Element* element) {
DCHECK(!equiv.IsNull());
DCHECK(!content.IsNull());
if (EqualIgnoringASCIICase(equiv, "default-style")) {
ProcessHttpEquivDefaultStyle(document, content);
} else if (EqualIgnoringASCIICase(equiv, "refresh")) {
ProcessHttpEquivRefresh(document, content, element);
} else if (EqualIgnoringASCIICase(equiv, "set-cookie")) {
ProcessHttpEquivSetCookie(document, content, element);
} else if (EqualIgnoringASCIICase(equiv, "content-language")) {
document.SetContentLanguage(content);
} else if (EqualIgnoringASCIICase(equiv, "x-dns-prefetch-control")) {
document.ParseDNSPrefetchControlHeader(content);
} else if (EqualIgnoringASCIICase(equiv, "x-frame-options")) {
document.AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kSecurity,
mojom::ConsoleMessageLevel::kError,
"X-Frame-Options may only be set via an HTTP header sent along with a "
"document. It may not be set inside <meta>."));
} else if (EqualIgnoringASCIICase(equiv, http_names::kAcceptCH)) {
ProcessHttpEquivAcceptCH(document, content);
} else if (EqualIgnoringASCIICase(equiv, http_names::kAcceptCHLifetime)) {
ProcessHttpEquivAcceptCHLifetime(document, content);
} else if (EqualIgnoringASCIICase(equiv, "content-security-policy") ||
EqualIgnoringASCIICase(equiv,
"content-security-policy-report-only")) {
if (in_document_head_element)
ProcessHttpEquivContentSecurityPolicy(document, equiv, content);
else
document.GetContentSecurityPolicy()->ReportMetaOutsideHead(content);
} else if (EqualIgnoringASCIICase(equiv, http_names::kOriginTrial)) {
if (in_document_head_element)
document.GetOriginTrialContext()->AddToken(content);
}
}
void HttpEquiv::ProcessHttpEquivContentSecurityPolicy(
Document& document,
const AtomicString& equiv,
const AtomicString& content) {
if (document.ImportLoader())
return;
if (document.GetSettings() && document.GetSettings()->BypassCSP())
return;
if (EqualIgnoringASCIICase(equiv, "content-security-policy")) {
document.GetContentSecurityPolicy()->DidReceiveHeader(
content, network::mojom::ContentSecurityPolicyType::kEnforce,
network::mojom::ContentSecurityPolicySource::kMeta);
} else if (EqualIgnoringASCIICase(equiv,
"content-security-policy-report-only")) {
document.GetContentSecurityPolicy()->DidReceiveHeader(
content, network::mojom::ContentSecurityPolicyType::kReport,
network::mojom::ContentSecurityPolicySource::kMeta);
} else {
NOTREACHED();
}
}
void HttpEquiv::ProcessHttpEquivAcceptCH(Document& document,
const AtomicString& content) {
LocalFrame* frame = document.GetFrame();
if (!frame)
return;
UseCounter::Count(document, WebFeature::kClientHintsMetaAcceptCH);
FrameClientHintsPreferencesContext hints_context(frame);
frame->GetClientHintsPreferences().UpdateFromAcceptClientHintsHeader(
content, document.Url(), &hints_context);
NotifyPersistentClientHintsToContentSettingsClient(document);
}
void HttpEquiv::ProcessHttpEquivAcceptCHLifetime(Document& document,
const AtomicString& content) {
LocalFrame* frame = document.GetFrame();
if (!frame)
return;
if (RuntimeEnabledFeatures::FeaturePolicyForClientHintsEnabled())
return;
UseCounter::Count(document, WebFeature::kClientHintsMetaAcceptCHLifetime);
FrameClientHintsPreferencesContext hints_context(frame);
frame->GetClientHintsPreferences().UpdateFromAcceptClientHintsLifetimeHeader(
content, document.Url(), &hints_context);
NotifyPersistentClientHintsToContentSettingsClient(document);
}
void HttpEquiv::ProcessHttpEquivDefaultStyle(Document& document,
const AtomicString& content) {
document.GetStyleEngine().SetHttpDefaultStyle(content);
}
void HttpEquiv::ProcessHttpEquivRefresh(Document& document,
const AtomicString& content,
Element* element) {
UseCounter::Count(document, WebFeature::kMetaRefresh);
if (!document.GetContentSecurityPolicy()->AllowInline(
ContentSecurityPolicy::InlineType::kScript, element, "" /* content */,
"" /* nonce */, NullURL(), OrdinalNumber(),
ReportingDisposition::kSuppressReporting)) {
UseCounter::Count(document,
WebFeature::kMetaRefreshWhenCSPBlocksInlineScript);
}
document.MaybeHandleHttpRefresh(content, Document::kHttpRefreshFromMetaTag);
}
void HttpEquiv::ProcessHttpEquivSetCookie(Document& document,
const AtomicString& content,
Element* element) {
document.AddConsoleMessage(MakeGarbageCollected<ConsoleMessage>(
mojom::ConsoleMessageSource::kSecurity,
mojom::ConsoleMessageLevel::kError,
String::Format("Blocked setting the `%s` cookie from a `<meta>` tag.",
content.Utf8().c_str())));
}
} // namespace blink
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