content/child/site_isolation_policy.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_CHILD_SITE_ISOLATION_POLICY_H_
   6 #define CONTENT_CHILD_SITE_ISOLATION_POLICY_H_
   7
   8 #include <map>
   9 #include <utility>
  10
  11 #include "base/gtest_prod_util.h"
  12 #include "base/memory/linked_ptr.h"
  13 #include "base/strings/string_piece.h"
  14 #include "content/common/content_export.h"
  15 #include "content/public/common/resource_type.h"
  16 #include "url/gurl.h"
  17
  18 namespace content {
  19
  20 struct ResourceResponseInfo;
  21
  22 // SiteIsolationPolicy implements the cross-site document blocking policy (XSDP)
  23 // for Site Isolation. XSDP will monitor network responses to a renderer and
  24 // block illegal responses so that a compromised renderer cannot steal private
  25 // information from other sites. For now SiteIsolationPolicy monitors responses
  26 // to gather various UMA stats to see the compatibility impact of actual
  27 // deployment of the policy. The UMA stat categories SiteIsolationPolicy gathers
  28 // are as follows:
  29 //
  30 // SiteIsolation.AllResponses : # of all network responses.
  31 // SiteIsolation.XSD.DataLength : the length of the first packet of a response.
  32 // SiteIsolation.XSD.MimeType (enum):
  33 //   # of responses from other sites, tagged with a document mime type.
  34 //   0:HTML, 1:XML, 2:JSON, 3:Plain, 4:Others
  35 // SiteIsolation.XSD.[%MIMETYPE].Blocked :
  36 //   blocked # of cross-site document responses grouped by sniffed MIME type.
  37 // SiteIsolation.XSD.[%MIMETYPE].Blocked.RenderableStatusCode :
  38 //   # of responses with renderable status code,
  39 //   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
  40 // SiteIsolation.XSD.[%MIMETYPE].Blocked.NonRenderableStatusCode :
  41 //   # of responses with non-renderable status code,
  42 //   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
  43 // SiteIsolation.XSD.[%MIMETYPE].NoSniffBlocked.RenderableStatusCode :
  44 //   # of responses failed to be sniffed for its MIME type, but blocked by
  45 //   "X-Content-Type-Options: nosniff" header, and with renderable status code
  46 //   out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
  47 // SiteIsolation.XSD.[%MIMETYPE].NoSniffBlocked.NonRenderableStatusCode :
  48 //   # of responses failed to be sniffed for its MIME type, but blocked by
  49 //   "X-Content-Type-Options: nosniff" header, and with non-renderable status
  50 //   code out of SiteIsolation.XSD.[%MIMETYPE].Blocked.
  51 // SiteIsolation.XSD.[%MIMETYPE].NotBlocked :
  52 //   # of responses, but not blocked due to failure of mime sniffing.
  53 // SiteIsolation.XSD.[%MIMETYPE].NotBlocked.MaybeJS :
  54 //   # of responses that are plausibly sniffed to be JavaScript.
  55
  56 struct SiteIsolationResponseMetaData {
  57   enum CanonicalMimeType {
  58     HTML = 0,
  59     XML = 1,
  60     JSON = 2,
  61     Plain = 3,
  62     Others = 4,
  63     MaxCanonicalMimeType,
  64   };
  65
  66   SiteIsolationResponseMetaData();
  67
  68   std::string frame_origin;
  69   GURL response_url;
  70   ResourceType resource_type;
  71   CanonicalMimeType canonical_mime_type;
  72   int http_status_code;
  73   bool no_sniff;
  74 };
  75
  76 class CONTENT_EXPORT SiteIsolationPolicy {
  77  public:
  78   // Set activation flag for the UMA data collection for this renderer process.
  79   static void SetPolicyEnabled(bool enabled);
  80
  81   // Returns any bookkeeping data about the HTTP header information for the
  82   // request identified by |request_id|. Any data returned should then be
  83   // passed to ShouldBlockResponse with the first packet.
  84   static linked_ptr<SiteIsolationResponseMetaData> OnReceivedResponse(
  85       const GURL& frame_origin,
  86       const GURL& response_url,
  87       ResourceType resource_type,
  88       int origin_pid,
  89       const ResourceResponseInfo& info);
  90
  91   // Examines the first network packet in case response_url is registered as a
  92   // cross-site document by DidReceiveResponse().  In case that this response is
  93   // blocked, it returns an alternative data to be sent to the renderer in
  94   // |alternative_data|. This records various kinds of UMA data stats. This
  95   // function is called only if the length of received data is non-zero.
  96   static bool ShouldBlockResponse(
  97       linked_ptr<SiteIsolationResponseMetaData>& resp_data, const char* payload,
  98       int length, std::string* alternative_data);
  99
 100 private:
 101   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsBlockableScheme);
 102   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsSameSite);
 103   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, IsValidCorsHeaderSet);
 104   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForHTML);
 105   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForXML);
 106   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForJSON);
 107   FRIEND_TEST_ALL_PREFIXES(SiteIsolationPolicyTest, SniffForJS);
 108
 109   // Returns the representative mime type enum value of the mime type of
 110   // response. For example, this returns the same value for all text/xml mime
 111   // type families such as application/xml, application/rss+xml.
 112   static SiteIsolationResponseMetaData::CanonicalMimeType GetCanonicalMimeType(
 113       const std::string& mime_type);
 114
 115   // Returns whether this scheme is a target of cross-site document
 116   // policy(XSDP). This returns true only for http://* and https://* urls.
 117   static bool IsBlockableScheme(const GURL& frame_origin);
 118
 119   // Returns whether the two urls belong to the same sites.
 120   static bool IsSameSite(const GURL& frame_origin, const GURL& response_url);
 121
 122   // Returns whether there's a valid CORS header for frame_origin.  This is
 123   // simliar to CrossOriginAccessControl::passesAccessControlCheck(), but we use
 124   // sites as our security domain, not origins.
 125   // TODO(dsjang): this must be improved to be more accurate to the actual CORS
 126   // specification. For now, this works conservatively, allowing XSDs that are
 127   // not allowed by actual CORS rules by ignoring 1) credentials and 2)
 128   // methods. Preflight requests don't matter here since they are not used to
 129   // decide whether to block a document or not on the client side.
 130   static bool IsValidCorsHeaderSet(const GURL& frame_origin,
 131                                    const GURL& website_origin,
 132                                    const std::string& access_control_origin);
 133
 134   static bool SniffForHTML(base::StringPiece data);
 135   static bool SniffForXML(base::StringPiece data);
 136   static bool SniffForJSON(base::StringPiece data);
 137
 138   // TODO(dsjang): this is only needed for collecting UMA stat. Will be deleted
 139   // when this class is used for actual blocking.
 140   static bool SniffForJS(base::StringPiece data);
 141
 142   // Never needs to be constructed/destructed.
 143   SiteIsolationPolicy() {}
 144   ~SiteIsolationPolicy() {}
 145
 146   DISALLOW_COPY_AND_ASSIGN(SiteIsolationPolicy);
 147 };
 148
 149 }  // namespace content
 150
 151 #endif  // CONTENT_CHILD_SITE_ISOLATION_POLICY_H_