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// 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.
#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 "webkit/common/resource_type.h"
class GURL;
namespace content {
struct ResourceResponseInfo;
// SiteIsolationPolicy 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. For now SiteIsolationPolicy monitors responses
// to gather various UMA stats to see the compatibility impact of actual
// deployment of the policy. The UMA stat categories SiteIsolationPolicy 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.
struct SiteIsolationResponseMetaData {
enum CanonicalMimeType {
HTML = 0,
XML = 1,
JSON = 2,
Plain = 3,
Others = 4,
std::string frame_origin;
GURL response_url;
ResourceType::Type resource_type;
CanonicalMimeType canonical_mime_type;
int http_status_code;
bool no_sniff;
class CONTENT_EXPORT SiteIsolationPolicy {
// Set activation flag for the UMA data collection for this renderer process.
static void SetPolicyEnabled(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 ShouldBlockResponse with the first packet.
static linked_ptr<SiteIsolationResponseMetaData> OnReceivedResponse(
const GURL& frame_origin,
const GURL& response_url,
ResourceType::Type resource_type,
int origin_pid,
const ResourceResponseInfo& info);
// Examines the first network packet in case response_url is registered as a
// cross-site document by DidReceiveResponse(). In case that this response is
// blocked, it returns an alternative data to be sent to the renderer in
// |alternative_data|. This records various kinds of UMA data stats. This
// function is called only if the length of received data is non-zero.
static bool ShouldBlockResponse(
linked_ptr<SiteIsolationResponseMetaData>& resp_data, const char* payload,
int length, std::string* alternative_data);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsBlockableScheme);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsSameSite);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsValidCorsHeaderSet);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForHTML);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForXML);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForJSON);
FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForJS);
// 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 SiteIsolationResponseMetaData::CanonicalMimeType 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);
// TODO(dsjang): this is only needed for collecting UMA stat. Will be deleted
// when this class is used for actual blocking.
static bool SniffForJS(base::StringPiece data);
// Never needs to be constructed/destructed.
SiteIsolationPolicy() {}
~SiteIsolationPolicy() {}
} // namespace content