From b139eadf0b00aacb4e9b78c476a8832e5f60fbd1 Mon Sep 17 00:00:00 2001
From: Kyle Spearrin <kyle.spearrin@gmail.com>
Date: Thu, 8 Jun 2017 11:43:26 -0400
Subject: [PATCH] KeyStoreBackedStorageService email crash reports

---
 .../Services/KeyStoreBackedStorageService.cs  | 68 ++++++++++++++++---
 1 file changed, 57 insertions(+), 11 deletions(-)

diff --git a/src/Android/Services/KeyStoreBackedStorageService.cs b/src/Android/Services/KeyStoreBackedStorageService.cs
index b0225da9b..0ffed7ecb 100644
--- a/src/Android/Services/KeyStoreBackedStorageService.cs
+++ b/src/Android/Services/KeyStoreBackedStorageService.cs
@@ -12,6 +12,7 @@ using Android.App;
 using Plugin.Settings.Abstractions;
 using Java.Util;
 using Javax.Crypto.Spec;
+using Android.Content;
 
 namespace Bit.Android.Services
 {
@@ -30,17 +31,59 @@ namespace Bit.Android.Services
 
         public KeyStoreBackedStorageService(ISettings settings)
         {
-            _oldAndroid = Build.VERSION.SdkInt < BuildVersionCodes.M;
-            _rsaMode = _oldAndroid ? "RSA/ECB/PKCS1Padding" : "RSA/ECB/OAEPWithSHA-1AndMGF1Padding";
+            try
+            {
+                _oldAndroid = Build.VERSION.SdkInt < BuildVersionCodes.M;
+                _rsaMode = _oldAndroid ? "RSA/ECB/PKCS1Padding" : "RSA/ECB/OAEPWithSHA-1AndMGF1Padding";
 
-            _oldKeyStorageService = new KeyStoreStorageService(new char[] { });
-            _settings = settings;
+                _oldKeyStorageService = new KeyStoreStorageService(new char[] { });
+                _settings = settings;
 
-            _keyStore = KeyStore.GetInstance(AndroidKeyStore);
-            _keyStore.Load(null);
+                _keyStore = KeyStore.GetInstance(AndroidKeyStore);
+                _keyStore.Load(null);
 
-            GenerateRsaKey();
-            GenerateAesKey();
+                GenerateRsaKey();
+                GenerateAesKey();
+            }
+            catch(Exception e)
+            {
+                SendEmail(e.Message + "\n\n" + e.StackTrace);
+                throw;
+            }
+        }
+
+        private void SendEmail(string text, bool includeSecurityProviders = true)
+        {
+            var crashMessage = "bitwarden has crashed. Please send this email to our support team so that we can help " +
+                "resolve the problem for you. Thank you.";
+
+            text = crashMessage + "\n\n =============================================== \n\n" + text;
+
+            if(includeSecurityProviders)
+            {
+                text += "\n\n";
+                var providers = Security.GetProviders();
+                foreach(var provider in providers)
+                {
+                    text += ("provider: " + provider.Name + "\n");
+                    var services = provider.Services;
+                    foreach(var service in provider.Services)
+                    {
+                        text += ("- alg: " + service.Algorithm + "\n");
+                    }
+                }
+            }
+
+            text += "\n\n ==================================================== \n\n" + crashMessage;
+
+            var emailIntent = new Intent(Intent.ActionSend);
+
+            emailIntent.SetType("plain/text");
+            emailIntent.PutExtra(Intent.ExtraEmail, new String[] { "hello@bitwarden.com" });
+            emailIntent.PutExtra(Intent.ExtraSubject, "bitwarden Crash Report");
+            emailIntent.PutExtra(Intent.ExtraText, text);
+
+            Application.Context.StartActivity(Intent.CreateChooser(emailIntent, "Send mail..."));
         }
 
         public bool Contains(string key)
@@ -78,10 +121,11 @@ namespace Bit.Android.Services
             {
                 return App.Utilities.Crypto.AesCbcDecrypt(new App.Models.CipherString(cs), aesKey);
             }
-            catch
+            catch(Exception e)
             {
                 Console.WriteLine("Failed to decrypt from secure storage.");
                 _settings.Remove(formattedKey);
+                SendEmail(e.Message + "\n\n" + e.StackTrace);
                 return null;
             }
         }
@@ -107,9 +151,10 @@ namespace Bit.Android.Services
                 var cipherString = App.Utilities.Crypto.AesCbcEncrypt(dataBytes, aesKey);
                 _settings.AddOrUpdateValue(formattedKey, cipherString.EncryptedString);
             }
-            catch
+            catch (Exception e)
             {
                 Console.WriteLine("Failed to encrypt to secure storage.");
+                SendEmail(e.Message + "\n\n" + e.StackTrace);
             }
         }
 
@@ -183,11 +228,12 @@ namespace Bit.Android.Services
                 var key = RsaDecrypt(encKeyBytes);
                 return new App.Models.SymmetricCryptoKey(key);
             }
-            catch
+            catch (Exception e)
             {
                 Console.WriteLine("Cannot get AesKey.");
                 _keyStore.DeleteEntry(KeyAlias);
                 _settings.Remove(AesKey);
+                SendEmail(e.Message + "\n\n" + e.StackTrace);
                 return null;
             }
         }