[Patch 5 of 6] Split out the site_isolation_policy files

content/child/site_isolation_policy.h

-// Copyright 2013 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_CHILD_SITE_ISOLATION_POLICY_H_
-#define CONTENT_CHILD_SITE_ISOLATION_POLICY_H_
-
-#include <map>
-#include <utility>
-
-#include "base/gtest_prod_util.h"
-#include "base/memory/linked_ptr.h"
-#include "base/strings/string_piece.h"
-#include "content/common/content_export.h"
-#include "content/public/common/resource_type.h"
-#include "url/gurl.h"
-
-namespace content {
-
-struct ResourceResponseInfo;
-
-// 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.
-//
-// SiteIsolationStatsGatherer monitors responses to gather various UMA stats to
-// see the compatibility impact of actual deployment of the policy. The UMA stat
-// categories SiteIsolationStatsGatherer gathers are as follows:
-//
-// SiteIsolation.AllResponses : # of all network responses.
-// SiteIsolation.XSD.DataLength : the length of the first packet of a response.
-// SiteIsolation.XSD.MimeType (enum):
-//   # of responses from other sites, tagged with a document mime type.
-//   0:HTML, 1:XML, 2:JSON, 3:Plain, 4:Others
-// SiteIsolation.XSD.[%MIMETYPE].Blocked :
-//   blocked # of cross-site document responses grouped by sniffed MIME type.
-// SiteIsolation.XSD.[%MIMETYPE].Blocked.RenderableStatusCode :
-//   # of responses with renderable status code,
-//   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
-// SiteIsolation.XSD.[%MIMETYPE].Blocked.NonRenderableStatusCode :
-//   # of responses with non-renderable status code,
-//   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
-// SiteIsolation.XSD.[%MIMETYPE].NoSniffBlocked.RenderableStatusCode :
-//   # of responses failed to be sniffed for its MIME type, but blocked by
-//   "X-Content-Type-Options: nosniff" header, and with renderable status code
-//   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
-// SiteIsolation.XSD.[%MIMETYPE].NoSniffBlocked.NonRenderableStatusCode :
-//   # of responses failed to be sniffed for its MIME type, but blocked by
-//   "X-Content-Type-Options: nosniff" header, and with non-renderable status
-//   code out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
-// SiteIsolation.XSD.[%MIMETYPE].NotBlocked :
-//   # of responses, but not blocked due to failure of mime sniffing.
-// SiteIsolation.XSD.[%MIMETYPE].NotBlocked.MaybeJS :
-//   # of responses that are plausibly sniffed to be JavaScript.
-
-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,
-};
-
-struct SiteIsolationResponseMetaData {
-  SiteIsolationResponseMetaData();
-
-  std::string frame_origin;
-  GURL response_url;
-  ResourceType resource_type;
-  CrossSiteDocumentMimeType canonical_mime_type;
-  int http_status_code;
-  bool no_sniff;
-};
-
-// TODO(nick): Move this class into its own file.
-class CONTENT_EXPORT SiteIsolationStatsGatherer {
- public:
-  // Set activation flag for the UMA data collection for this renderer process.
-  static void SetEnabled(bool enabled);
-
-  // Returns any bookkeeping data about the HTTP header information for the
-  // request identified by |request_id|. Any data returned should then be
-  // passed to OnReceivedFirstChunk() with the first data chunk.
-  static linked_ptr<SiteIsolationResponseMetaData> OnReceivedResponse(
-      const GURL& frame_origin,
-      const GURL& response_url,
-      ResourceType resource_type,
-      int origin_pid,
-      const ResourceResponseInfo& info);
-
-  // Examines the first chunk of network data in case response_url is registered
-  // as a cross-site document by OnReceivedResponse(). This records various
-  // kinds of UMA data stats. This function is called only if the length of
-  // received data is non-zero.
-  static bool OnReceivedFirstChunk(
-      const linked_ptr<SiteIsolationResponseMetaData>& resp_data,
-      const char* payload,
-      int length);
- private:
-  FRIEND_TEST_ALL_PREFIXES(SiteIsolationStatsGathererTest, SniffForJS);
-
-  SiteIsolationStatsGatherer();  // Not instantiable.
-
-  // Imprecise JS sniffing; only appropriate for collecting UMA stat.
-  static bool SniffForJS(base::StringPiece data);
-
-  DISALLOW_COPY_AND_ASSIGN(SiteIsolationStatsGatherer);
-};
-
-// TODO(nick): Move this class into its own file.
-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_CHILD_SITE_ISOLATION_POLICY_H_