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// Copyright 2015 The Chromium Authors
// 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 "services/network/public/mojom/content_security_policy.mojom-blink-forward.h"
#include "third_party/blink/public/platform/web_content_settings_client.h"
#include "third_party/blink/renderer/bindings/core/v8/capture_source_location.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/local_dom_window.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/html/html_meta_element.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/origin_trials/origin_trial_context.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.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 {
void HttpEquiv::Process(Document& document,
const AtomicString& equiv,
const AtomicString& content,
bool in_document_head_element,
bool is_sync_parser,
Element* element) {
DCHECK(!equiv.IsNull());
DCHECK(!content.IsNull());
if (EqualIgnoringASCIICase(equiv, "default-style")) {
ProcessHttpEquivDefaultStyle(document, content);
} else if (EqualIgnoringASCIICase(equiv, "refresh")) {
ProcessHttpEquivRefresh(document.domWindow(), 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)) {
HTMLMetaElement::ProcessMetaCH(document, content,
network::MetaCHType::HttpEquivAcceptCH,
/*is_doc_preloader=*/false, is_sync_parser);
} else if (EqualIgnoringASCIICase(equiv, http_names::kDelegateCH)) {
HTMLMetaElement::ProcessMetaCH(document, content,
network::MetaCHType::HttpEquivDelegateCH,
/*is_doc_preloader=*/false, is_sync_parser);
} else if (EqualIgnoringASCIICase(equiv, "content-security-policy") ||
EqualIgnoringASCIICase(equiv,
"content-security-policy-report-only")) {
if (in_document_head_element) {
ProcessHttpEquivContentSecurityPolicy(document.domWindow(), equiv,
content);
} else if (auto* window = document.domWindow()) {
window->GetContentSecurityPolicy()->ReportMetaOutsideHead(content);
}
} else if (EqualIgnoringASCIICase(equiv, http_names::kOriginTrial)) {
if (in_document_head_element) {
ProcessHttpEquivOriginTrial(document.domWindow(), content);
}
}
}
void HttpEquiv::ProcessHttpEquivContentSecurityPolicy(
LocalDOMWindow* window,
const AtomicString& equiv,
const AtomicString& content) {
if (!window || !window->GetFrame())
return;
if (window->GetFrame()->GetSettings()->GetBypassCSP())
return;
if (EqualIgnoringASCIICase(equiv, "content-security-policy")) {
Vector<network::mojom::blink::ContentSecurityPolicyPtr> parsed =
ParseContentSecurityPolicies(
content, network::mojom::blink::ContentSecurityPolicyType::kEnforce,
network::mojom::blink::ContentSecurityPolicySource::kMeta,
*(window->GetSecurityOrigin()));
window->GetContentSecurityPolicy()->AddPolicies(mojo::Clone(parsed));
window->GetPolicyContainer()->AddContentSecurityPolicies(std::move(parsed));
} else if (EqualIgnoringASCIICase(equiv,
"content-security-policy-report-only")) {
window->GetContentSecurityPolicy()->ReportReportOnlyInMeta(content);
} else {
NOTREACHED();
}
}
void HttpEquiv::ProcessHttpEquivDefaultStyle(Document& document,
const AtomicString& content) {
document.GetStyleEngine().SetHttpDefaultStyle(content);
}
void HttpEquiv::ProcessHttpEquivOriginTrial(LocalDOMWindow* window,
const AtomicString& content) {
if (!window)
return;
// For meta tags injected by script, process the token with the origin of the
// external script, if available. Get the top 3 script urls from the stack, as
// the script that injected the meta tag might not be topmost. For example,
// due to a script that overrides builtin functions, like Node.appendChild().
// See crbug.com/1193888.
// NOTE: The external script origin is not considered security-critical. See
// the comment thread in the design doc for details:
// https://docs.google.com/document/d/1xALH9W7rWmX0FpjudhDeS2TNTEOXuPn4Tlc9VmuPdHA/edit?disco=AAAAJyG8StI
Vector<String> candidate_scripts = CaptureScriptUrlsFromCurrentStack(
window->GetIsolate(), /*unique_url_count=*/3);
Vector<scoped_refptr<SecurityOrigin>> external_origins;
for (const String& external_script : candidate_scripts) {
KURL external_script_url(external_script);
if (!external_script_url.IsValid())
continue;
external_origins.push_back(SecurityOrigin::Create(external_script_url));
}
if (external_origins.size() > 0) {
window->GetOriginTrialContext()->AddTokenFromExternalScript(
content, external_origins);
return;
}
// Process token as usual, without an external script origin.
window->GetOriginTrialContext()->AddToken(content);
}
void HttpEquiv::ProcessHttpEquivRefresh(LocalDOMWindow* window,
const AtomicString& content,
Element* element) {
if (!window)
return;
UseCounter::Count(window, WebFeature::kMetaRefresh);
if (!window->GetContentSecurityPolicy()->AllowInline(
ContentSecurityPolicy::InlineType::kScript, element, "" /* content */,
"" /* nonce */, NullURL(), OrdinalNumber::First(),
ReportingDisposition::kSuppressReporting)) {
UseCounter::Count(window,
WebFeature::kMetaRefreshWhenCSPBlocksInlineScript);
}
window->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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