using System; using System.Collections.Generic; using System.Linq; using Android.AccessibilityServices; using Android.App; using Android.Content; using Android.OS; using Android.Views.Accessibility; namespace Bit.Android { [Service(Permission = "android.permission.BIND_ACCESSIBILITY_SERVICE", Label = "bitwarden")] [IntentFilter(new string[] { "android.accessibilityservice.AccessibilityService" })] [MetaData("android.accessibilityservice", Resource = "@xml/accessibilityservice")] public class AutofillService : AccessibilityService { private const int AutoFillNotificationId = 34573; private const string SystemUiPackage = "com.android.systemui"; private const string BitwardenPackage = "com.x8bit.bitwarden"; private const string BitwardenWebsite = "bitwarden.com"; public static bool Enabled { get; set; } = false; private static Dictionary SupportedBrowsers => new List { new Browser("com.android.chrome", "url_bar"), new Browser("com.chrome.beta", "url_bar"), new Browser("com.android.browser", "url"), new Browser("com.brave.browser", "url_bar"), new Browser("com.opera.browser", "url_field"), new Browser("com.opera.browser.beta", "url_field"), new Browser("com.opera.mini.native", "url_field"), new Browser("com.chrome.dev", "url_bar"), new Browser("com.chrome.canary", "url_bar"), new Browser("com.google.android.apps.chrome", "url_bar"), new Browser("com.google.android.apps.chrome_dev", "url_bar"), new Browser("org.iron.srware", "url_bar"), new Browser("com.sec.android.app.sbrowser", "sbrowser_url_bar"), new Browser("com.yandex.browser", "bro_omnibar_address_title_text", (s) => s.Split(' ').FirstOrDefault()), new Browser("org.mozilla.firefox", "url_bar_title"), new Browser("org.mozilla.firefox_beta", "url_bar_title"), new Browser("com.ghostery.android.ghostery", "search_field"), new Browser("org.adblockplus.browser", "url_bar_title"), new Browser("com.htc.sense.browser", "title"), new Browser("com.amazon.cloud9", "url"), new Browser("mobi.mgeek.TunnyBrowser", "title"), new Browser("com.nubelacorp.javelin", "enterUrl"), new Browser("com.jerky.browser2", "enterUrl"), new Browser("com.mx.browser", "address_editor_with_progress"), new Browser("com.mx.browser.tablet", "address_editor_with_progress"), new Browser("com.linkbubble.playstore", "url_text"), new Browser("com.ksmobile.cb", "address_bar_edit_text") }.ToDictionary(n => n.PackageName); public override void OnAccessibilityEvent(AccessibilityEvent e) { Enabled = true; var root = RootInActiveWindow; if(string.IsNullOrWhiteSpace(e.PackageName) || e.PackageName == SystemUiPackage || root?.PackageName != e.PackageName) { return; } /* var testNodes = GetWindowNodes(root, e, n => n.ViewIdResourceName != null && n.Text != null) .Select(n => new { id = n.ViewIdResourceName, text = n.Text }); */ switch(e.EventType) { case EventTypes.WindowContentChanged: case EventTypes.WindowStateChanged: var cancelNotification = true; if(e.PackageName == BitwardenPackage) { CancelNotification(); break; } var passwordNodes = GetWindowNodes(root, e, n => n.Password); if(passwordNodes.Any()) { var uri = GetUri(root); if(uri != null && !uri.Contains(BitwardenWebsite)) { if(NeedToAutofill(AutofillActivity.LastCredentials, uri)) { var allEditTexts = GetWindowNodes(root, e, n => EditText(n)); var usernameEditText = allEditTexts.TakeWhile(n => !n.Password).LastOrDefault(); FillCredentials(usernameEditText, passwordNodes); } else { NotifyToAutofill(uri); cancelNotification = false; } } AutofillActivity.LastCredentials = null; } if(cancelNotification) { CancelNotification(); } break; default: break; } } public override void OnInterrupt() { } protected override void OnServiceConnected() { base.OnServiceConnected(); Enabled = true; } public override void OnDestroy() { base.OnDestroy(); Enabled = false; } private void CancelNotification() { var notificationManager = ((NotificationManager)GetSystemService(NotificationService)); notificationManager.Cancel(AutoFillNotificationId); } private string GetUri(AccessibilityNodeInfo root) { var uri = string.Concat(App.Constants.AndroidAppProtocol, root.PackageName); if(SupportedBrowsers.ContainsKey(root.PackageName)) { var addressNode = root.FindAccessibilityNodeInfosByViewId( $"{root.PackageName}:id/{SupportedBrowsers[root.PackageName].UriViewId}").FirstOrDefault(); if(addressNode != null) { uri = ExtractUri(uri, addressNode, SupportedBrowsers[root.PackageName]); } } return uri; } private string ExtractUri(string uri, AccessibilityNodeInfo addressNode, Browser browser) { if(addressNode?.Text != null) { uri = browser.GetUriFunction(addressNode.Text); if(uri != null && uri.Contains(".")) { if(!uri.Contains("://")) { uri = string.Concat("http://", uri); } else if(Build.VERSION.SdkInt <= BuildVersionCodes.KitkatWatch) { var parts = uri.Split(new string[] { ". " }, StringSplitOptions.None); if(parts.Length > 1) { var urlPart = parts.FirstOrDefault(p => p.StartsWith("http")); if(urlPart != null) { uri = urlPart.Trim(); } } } } } return uri; } /// /// Check to make sure it is ok to autofill still on the current screen /// private bool NeedToAutofill(AutofillCredentials creds, string currentUriString) { if(creds == null) { return false; } Uri lastUri, currentUri; if(Uri.TryCreate(creds.LastUri, UriKind.Absolute, out lastUri) && Uri.TryCreate(currentUriString, UriKind.Absolute, out currentUri) && lastUri.Host == currentUri.Host) { return true; } return false; } private static bool EditText(AccessibilityNodeInfo n) { return n.ClassName != null && n.ClassName.Contains("EditText"); } private void NotifyToAutofill(string uri) { var intent = new Intent(this, typeof(AutofillActivity)); intent.PutExtra("uri", uri); intent.SetFlags(ActivityFlags.NewTask | ActivityFlags.SingleTop | ActivityFlags.ClearTop); var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.UpdateCurrent); var builder = new Notification.Builder(this); builder.SetSmallIcon(Resource.Drawable.notification_sm) .SetContentTitle(App.Resources.AppResources.BitwardenAutofillService) .SetContentText(App.Resources.AppResources.BitwardenAutofillServiceNotificationContent) .SetTicker(App.Resources.AppResources.BitwardenAutofillServiceNotificationContent) .SetWhen(Java.Lang.JavaSystem.CurrentTimeMillis()) .SetContentIntent(pendingIntent); if(Build.VERSION.SdkInt > BuildVersionCodes.KitkatWatch) { builder.SetVisibility(NotificationVisibility.Secret) .SetColor(global::Android.Support.V4.Content.ContextCompat.GetColor(ApplicationContext, Resource.Color.primary)); } var notificationManager = (NotificationManager)GetSystemService(NotificationService); notificationManager.Notify(AutoFillNotificationId, builder.Build()); } private void FillCredentials(AccessibilityNodeInfo usernameNode, IEnumerable passwordNodes) { FillEditText(usernameNode, AutofillActivity.LastCredentials.Username); foreach(var n in passwordNodes) { FillEditText(n, AutofillActivity.LastCredentials.Password); } } private static void FillEditText(AccessibilityNodeInfo editTextNode, string value) { if(editTextNode == null || value == null) { return; } var bundle = new Bundle(); bundle.PutString(AccessibilityNodeInfo.ActionArgumentSetTextCharsequence, value); editTextNode.PerformAction(global::Android.Views.Accessibility.Action.SetText, bundle); } private IEnumerable GetWindowNodes(AccessibilityNodeInfo n, AccessibilityEvent e, Func condition) { if(n != null) { if(n.WindowId == e.WindowId && !(n.ViewIdResourceName?.StartsWith(SystemUiPackage) ?? false) && condition(n)) { yield return n; } for(int i = 0; i < n.ChildCount; i++) { foreach(var node in GetWindowNodes(n.GetChild(i), e, condition)) { yield return node; } } } } public class Browser { public Browser(string packageName, string uriViewId) { PackageName = packageName; UriViewId = uriViewId; } public Browser(string packageName, string uriViewId, Func getUriFunction) : this(packageName, uriViewId) { GetUriFunction = getUriFunction; } public string PackageName { get; set; } public string UriViewId { get; set; } public Func GetUriFunction { get; set; } = (s) => s; } } }