WKWebView(iOS9): correctly update SSL status for current navigation item

ios/web/web_state/ui/crw_wk_web_view_web_controller.mm

 // Copyright 2014 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.
 
 #import "ios/web/web_state/ui/crw_wk_web_view_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #include "base/ios/ios_util.h"
 #include "base/ios/weak_nsobject.h"
 #include "base/json/json_reader.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
 #import "ios/net/http_response_headers_util.h"
 #import "ios/web/crw_network_activity_indicator_manager.h"
 #import "ios/web/navigation/crw_session_controller.h"
 #import "ios/web/navigation/crw_session_entry.h"
 #include "ios/web/navigation/navigation_item_impl.h"
 #include "ios/web/navigation/web_load_params.h"
 #import "ios/web/net/crw_cert_verification_controller.h"
 #include "ios/web/public/cert_store.h"
@@ skipping 51 matching lines @@
                          userInfo:userInfo];
 }
 WKWebViewErrorSource WKWebViewErrorSourceFromError(NSError* error) {
   DCHECK(error);
   return static_cast<WKWebViewErrorSource>(
       [error.userInfo[kWKWebViewErrorSourceKey] integerValue]);
 }
 
 }  // namespace
 
+#if !defined(__IPHONE_9_0)

[stuartmorgan, 2015/10/06 22:02:36]

You're missing:
 || __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_9_0

[Eugene But (OOO till 7-30), 2015/10/07 15:27:13]

Done.

+// Predeclare iOS9 API so calls are compiled on iOS8 bots.
+// TODO(eugenebut): cleanup this (crbug.com/523365).
+@interface WKWebView (CRWIOS9API)
+@property(nonatomic, readonly, copy) NSArray* certificateChain;
+@end
+#endif
+
 @interface CRWWKWebViewWebController () <WKNavigationDelegate,
                                          WKScriptMessageHandler,
                                          WKUIDelegate> {
   // The WKWebView managed by this instance.
   base::scoped_nsobject<WKWebView> _wkWebView;
 
   // The Watch Dog that detects and reports WKWebView crashes.
   base::scoped_nsobject<CRWWKWebViewCrashDetector> _crashDetector;
 
   // The actual URL of the document object (i.e., the last committed URL).
@@ skipping 148 matching lines @@
 // Called when a load ends in an SSL error and certificate chain.
 - (void)handleSSLCertError:(NSError*)error;
 #endif
 
 // Adds an activity indicator tasks for this web controller.
 - (void)addActivityIndicatorTask;
 
 // Clears all activity indicator tasks for this web controller.
 - (void)clearActivityIndicatorTasks;
 
+// Obtains SSL status from given |certChain| and updates navigation items with
+// given |certID| and |host|.
+- (void)updateSSLStatusForNavigationItemsWithCertID:(int)certID
+                                               host:(NSString*)host
+                                     usingCertChain:(NSArray*)certChain;
+
 #if !defined(ENABLE_CHROME_NET_STACK_FOR_WKWEBVIEW)
 // Updates SSL status for the current navigation item based on the information
 // provided by web view.
 - (void)updateSSLStatusForCurrentNavigationItem;
 #endif
 
+// Reports "WebController.WKWebViewHasCertForSecureConnection" UMA.
+- (void)reportHasCertForSecureConnectionUMAWithValue:(bool)value;
+
 // Registers load request with empty referrer and link or client redirect
 // transition based on user interaction state.
 - (void)registerLoadRequest:(const GURL&)url;
 
 // Called when a non-document-changing URL change occurs. Updates the
 // _documentURL, and informs the superclass of the change.
 - (void)URLDidChangeWithoutDocumentChange:(const GURL&)URL;
 
 // Returns new autoreleased instance of WKUserContentController which has
 // early page script.
@@ skipping 588 matching lines @@
 - (void)addActivityIndicatorTask {
   [[CRWNetworkActivityIndicatorManager sharedInstance]
       startNetworkTaskForGroup:[self activityIndicatorGroupID]];
 }
 
 - (void)clearActivityIndicatorTasks {
   [[CRWNetworkActivityIndicatorManager sharedInstance]
       clearNetworkTasksForGroup:[self activityIndicatorGroupID]];
 }
 
+- (void)updateSSLStatusForNavigationItemsWithCertID:(int)certID
+                                               host:(NSString*)host
+                                     usingCertChain:(NSArray*)certChain {
+  base::WeakNSObject<CRWWKWebViewWebController> weakSelf(self);
+  void (^SSLStatusResponse)(web::SecurityStyle, net::CertStatus) = ^(
+      web::SecurityStyle style, net::CertStatus certStatus) {
+    base::scoped_nsobject<CRWWKWebViewWebController> strongSelf(
+        [weakSelf retain]);
+    if (!strongSelf || [strongSelf isBeingDestroyed]) {
+      return;
+    }
+
+    web::NavigationManager* navigationManager =
+        [strongSelf webStateImpl]->GetNavigationManager();
+    int currentItemIndex = navigationManager->GetCurrentEntryIndex();

[stuartmorgan, 2015/10/06 22:02:36]

Are we guaranteed that the lookup can't be for a pending item? I'm pretty sure
this will only get the last committed item.

Maybe a DCHECK would be a good idea, since if that's not true we presumably want
to also check/update the pending entry.

[Eugene But (OOO till 7-30), 2015/10/07 15:27:13]

There is no need to do a lookup for a pending item. Lookup is happening only for
currentNavigationItem, to check if we need to call
webControllerDidUpdateSSLStatusForCurrentNavigationItem: delegate method.

That delegate method is not supposed to be called for pending item. Please let
me know if I misunderstood your question.

+
+    bool updatedCurrentItem = false;
+    std::string GURLHost = base::SysNSStringToUTF8(host);
+    for (int i = 0; i < navigationManager->GetEntryCount(); i++) {
+      web::NavigationItem* item = navigationManager->GetItemAtIndex(i);
+      web::SSLStatus& SSLStatus = item->GetSSL();
+      if (SSLStatus.cert_id == certID && item->GetURL().host() == GURLHost) {
+        web::SSLStatus previousSSLStatus = item->GetSSL();
+        SSLStatus.cert_status = certStatus;
+        SSLStatus.security_style = style;
+        if (currentItemIndex == i && !previousSSLStatus.Equals(SSLStatus)) {
+          updatedCurrentItem = true;
+        }
+      }
+    }
+
+    if (updatedCurrentItem) {
+      [strongSelf didUpdateSSLStatusForCurrentNavigationItem];
+    }
+  };
+
+  [_certVerificationController
+      querySSLStatusForTrust:web::CreateServerTrustFromChain(certChain, host)
+                        host:host
+           completionHandler:SSLStatusResponse];
+}
+
 #if !defined(ENABLE_CHROME_NET_STACK_FOR_WKWEBVIEW)
+
 - (void)updateSSLStatusForCurrentNavigationItem {
   if ([self isBeingDestroyed])
     return;
 
-  DCHECK(self.webStateImpl);
   web::NavigationItem* item =
       self.webStateImpl->GetNavigationManagerImpl().GetLastCommittedItem();
   if (!item)
     return;
 
   web::SSLStatus previousSSLStatus = item->GetSSL();
   web::SSLStatus& SSLStatus = item->GetSSL();
-  if (item->GetURL().SchemeIsCryptographic()) {
-    // TODO(eugenebut): Do not set security style to authenticated once
-    // proceeding with bad ssl cert is implemented.
-    SSLStatus.security_style = web::SECURITY_STYLE_AUTHENTICATED;
-    SSLStatus.content_status = [_wkWebView hasOnlySecureContent]
-                                   ? web::SSLStatus::NORMAL_CONTENT
-                                   : web::SSLStatus::DISPLAYED_INSECURE_CONTENT;
 
-    if (base::ios::IsRunningOnIOS9OrLater()) {
-      scoped_refptr<net::X509Certificate> cert(web::CreateCertFromChain(
-          [_wkWebView performSelector:@selector(certificateChain)]));
-      if (cert) {
-        SSLStatus.cert_id = web::CertStore::GetInstance()->StoreCert(
-            cert.get(), self.certGroupID);
-      } else {
-        SSLStatus.security_style = web::SECURITY_STYLE_UNAUTHENTICATED;
-        SSLStatus.cert_id = 0;
+  // Starting from iOS9 WKWebView blocks active mixed content, so if
+  // |hasOnlySecureContent| returns NO it means passive content.
+  // On iOS8 there is no way to determine if web view has active mixed content.
+  SSLStatus.content_status = [_wkWebView hasOnlySecureContent]
+                                 ? web::SSLStatus::NORMAL_CONTENT
+                                 : web::SSLStatus::DISPLAYED_INSECURE_CONTENT;
+
+  // Retrieve top level frame certificate.

[stuartmorgan, 2015/10/06 22:02:36]

Since the innermost code in the block is updating something, not just
retrieving, this seems misleading. Maybe you can factor out some of the code
that doesn't modify anything into a helper method to make the separation of
responsibilities cleaner?

[Eugene But (OOO till 7-30), 2015/10/07 15:27:13]

Updated comment. I can't really factor much of the code, unless I create an ugly
method like:
-getCert:certChain:forNavigationItem:

But I'm open for suggestions.

+  scoped_refptr<net::X509Certificate> cert;
+  if (base::ios::IsRunningOnIOS9OrLater() &&
+      item->GetURL().SchemeIsCryptographic()) {
+    NSArray* chain = [_wkWebView certificateChain];
+    cert = web::CreateCertFromChain(chain);
+    if (cert) {
+      [self reportHasCertForSecureConnectionUMAWithValue:true];
+      int oldCertID = SSLStatus.cert_id;
+      SSLStatus.cert_id = web::CertStore::GetInstance()->StoreCert(
+          cert.get(), self.certGroupID);
+      NSString* host = [_wkWebView URL].host;

[stuartmorgan, 2015/10/06 22:02:36]

Are you sure you want the raw web view URL, rather than the WC's understanding
of the URL? If so, please comment why here.

[Eugene But (OOO till 7-30), 2015/10/07 15:27:13]

I wanted to avoid std::string -> NSString conversion, but it's not really a good
reason. Changed to use |_documentURL|.

+      if (oldCertID != SSLStatus.cert_id ||
+          item->GetURL().host() != base::SysNSStringToUTF8(host)) {
+        [self updateSSLStatusForNavigationItemsWithCertID:SSLStatus.cert_id
+                                                     host:host
+                                           usingCertChain:chain];
       }
     }
-  } else {
-    SSLStatus.security_style = web::SECURITY_STYLE_UNAUTHENTICATED;
+  }
+
+  if (!cert) {
     SSLStatus.cert_id = 0;
+    if (!item->GetURL().SchemeIsCryptographic()) {
+      // HTTP or other non-secure connection.
+      SSLStatus.security_style = web::SECURITY_STYLE_UNAUTHENTICATED;
+    } else if (base::ios::IsRunningOnIOS9OrLater()) {
+      // HTTPS, iOS9 and no certificate (this use-case has not been observed).
+      [self reportHasCertForSecureConnectionUMAWithValue:false];
+      SSLStatus.security_style = web::SECURITY_STYLE_UNKNOWN;
+    } else {
+      // HTTPS, iOS8.
+      // iOS8 cannot load unauthenticated HTTPS content.
+      SSLStatus.security_style = web::SECURITY_STYLE_AUTHENTICATED;
+    }
   }
 
   if (!previousSSLStatus.Equals(SSLStatus)) {
     [self didUpdateSSLStatusForCurrentNavigationItem];
   }
 }
+
+- (void)reportHasCertForSecureConnectionUMAWithValue:(bool)value {
+  UMA_HISTOGRAM_BOOLEAN("WebController.WKWebViewHasCertForSecureConnection",
+                        value);
+}
+
 #endif  // !defined(ENABLE_CHROME_NET_STACK_FOR_WKWEBVIEW)
 
 - (void)registerLoadRequest:(const GURL&)url {
   // If load request is registered via WKWebViewWebController, assume transition
   // is link or client redirect as other transitions will already be registered
   // by web controller or delegates.
   // TODO(stuartmorgan): Remove guesswork and replace with information from
   // decidePolicyForNavigationAction:.
   ui::PageTransition transition = self.userInteractionRegistered
                                       ? ui::PAGE_TRANSITION_LINK
@@ skipping 570 matching lines @@
                               placeholderText:defaultText
                                    requestURL:
             net::GURLWithNSURL(frame.request.URL)
                             completionHandler:completionHandler];
   } else if (completionHandler) {
     completionHandler(nil);
   }
 }
 
 @end