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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.
#ifndef CONTENT_COMMON_CROSS_SITE_DOCUMENT_CLASSIFIER_H_
#define CONTENT_COMMON_CROSS_SITE_DOCUMENT_CLASSIFIER_H_
#include "base/macros.h"
#include "base/strings/string_piece.h"
#include "content/common/content_export.h"
#include "url/gurl.h"
namespace content {
// CrossSiteDocumentClassifier implements the cross-site document blocking
// policy (XSDP) for Site Isolation. XSDP will monitor network responses to a
// renderer and block illegal responses so that a compromised renderer cannot
// steal private information from other sites.
enum CrossSiteDocumentMimeType {
// Note that these values are used in histograms, and must not change.
CROSS_SITE_DOCUMENT_MIME_TYPE_HTML = 0,
CROSS_SITE_DOCUMENT_MIME_TYPE_XML = 1,
CROSS_SITE_DOCUMENT_MIME_TYPE_JSON = 2,
CROSS_SITE_DOCUMENT_MIME_TYPE_PLAIN = 3,
CROSS_SITE_DOCUMENT_MIME_TYPE_OTHERS = 4,
CROSS_SITE_DOCUMENT_MIME_TYPE_MAX,
};
class CONTENT_EXPORT CrossSiteDocumentClassifier {
public:
// Returns the representative mime type enum value of the mime type of
// response. For example, this returns the same value for all text/xml mime
// type families such as application/xml, application/rss+xml.
static CrossSiteDocumentMimeType GetCanonicalMimeType(
const std::string& mime_type);
// Returns whether this scheme is a target of cross-site document
// policy(XSDP). This returns true only for http://* and https://* urls.
static bool IsBlockableScheme(const GURL& frame_origin);
// Returns whether the two urls belong to the same sites.
static bool IsSameSite(const GURL& frame_origin, const GURL& response_url);
// Returns whether there's a valid CORS header for frame_origin. This is
// simliar to CrossOriginAccessControl::passesAccessControlCheck(), but we use
// sites as our security domain, not origins.
// TODO(dsjang): this must be improved to be more accurate to the actual CORS
// specification. For now, this works conservatively, allowing XSDs that are
// not allowed by actual CORS rules by ignoring 1) credentials and 2)
// methods. Preflight requests don't matter here since they are not used to
// decide whether to block a document or not on the client side.
static bool IsValidCorsHeaderSet(const GURL& frame_origin,
const GURL& website_origin,
const std::string& access_control_origin);
static bool SniffForHTML(base::StringPiece data);
static bool SniffForXML(base::StringPiece data);
static bool SniffForJSON(base::StringPiece data);
private:
CrossSiteDocumentClassifier(); // Not instantiable.
DISALLOW_COPY_AND_ASSIGN(CrossSiteDocumentClassifier);
};
} // namespace content
#endif // CONTENT_COMMON_CROSS_SITE_DOCUMENT_CLASSIFIER_H_
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