[Bug] MSAL .NET versions < 4.5.0 do not support system browser on iOS 13 #1399

mtanml · 2019-09-24T20:49:15Z

Edit to original post

If you are using the system browser with iOS 13, please update to MSAL.NET 4.5.0, which uses the required presentation context when authenticating on system browser with iOS 13.

If you are not using 4.5.0+, you will run into the issue listed below:

Starting with iOS 13, when authenticating using the system browser, MSAL .NET is required to provide a presentation context when using ASWebAuthenticationSession. Apple added multi-window support, and therefore they need to specifically know where to present the context (this is a breaking change).

In iOS 12, the AuthenticationSession API was iOS only and apps drew into a single window. However, now, with iPadiOS and macOS support, MSAL .NET will need to give the session a presentationContextProvider, and that presentationContextProvider will provide a window via the PresentationAnchor method.

Customer impact

Your app is impacted if all of the below are true:

You have a Xamarin iOS App, and
You are targeting iOS 13+, and
You use system browser (default in MSAL .NET) for interactive authentication
You are using a version lower then 4.5.0 of MSAL .NET

Workaround

Update to MSAL.NET 4.5.0, or higher, which includes the necessary fixes for handling the presentation context on iOS 13.

Or,

Use the embedded webview. Please see the documentation on enabling the embedded webview on Xamarin iOS

Example:

AuthenticationResult authResult;
authResult = app.AcquireTokenInteractively(scopes)
                .WithUseEmbeddedWebView(true)
                .ExecuteAsync();

Notable Concerns Regarding the Workaround to Use the Embedded Webview

Caution when targeting B2C using embedded webview and Google auth
Loss of SSO The great benefit of the system browser, and the reason why it is used by default in MSAL .NET, is the sharing of the SSO state with other applications and with web applications without needing a broker. More information provided here on SSO and the system browser

========

Original Post

Which Version of MSAL are you using ?
MSAL 4.4.0 (also occurs in 4.3.1)

Platform
Xamarin iOS

What authentication flow has the issue?

Desktop / Mobile
- [X ] Interactive
- Integrated Windows Auth
- Username Password
- Device code flow (browserless)
Web App
- Authorization code
- OBO
Web API
- OBO

Other? - please describe;

Is this a new or existing app?
The app is in production, and works fine on physical iOS devices (on both iOS 12.x and 13.0). I have upgraded my iPhone emulator to iOS 13, and that is where the issue occurs. Everything still works fine in iOS 12.2 on the emulator.

Repro

                    AuthenticationResult ar = await App.PCA.AcquireTokenInteractive(App.Scopes)
                        .WithAccount(Utils.GetAccountByPolicy(accounts, App.PolicySignUpSignIn))
                        .WithParentActivityOrWindow(App.ParentActivityOrWindow)
                        .ExecuteAsync();

Expected behavior
Authentication process initiates

Actual behavior
Immediately returns "authentication_canceled"

Possible Solution

Additional context/ Logs / Screenshots

The text was updated successfully, but these errors were encountered:

andresbj16 · 2019-09-25T00:20:09Z

I receive the same error, initially I thought it was for the version of the nuget package but even updating it to version 4.4.0 of MSAL the same error still occurs

zachgreencbt · 2019-09-25T02:51:10Z

I updated to Xcode 11/iOS 13 last night, and my code is now also returning this error. Was working fine prior to the upgrade.

rulasg · 2019-09-25T07:25:10Z

We are having the same issue. Since Xcode update to 11 with iOS 13, now code that works on iOS 12 Emulator return authentication_canceled exception. Repro with Microsoft.Identity.client 4.3.1 and 4.4

jmprieur · 2019-09-25T07:57:57Z

@zachgreencbt @rulasg @andresbj16 @mtanml : does the iOS emulator have the latest version of Microsoft Authenticator?

jmprieur · 2019-09-25T07:58:38Z

Also adding the Supportability tab as we'd want better error messages if possible than authentication_canceled.

lperezj · 2019-09-25T09:08:46Z

Mee too. I have the same problem. I update XCode and with the new simulator with IOS 13, not working. I update MSAL from 4.3.x to 4.4.0 and the problem is the same.

jmprieur · 2019-09-25T09:27:48Z

@lperezj : does the new simulator have the latest Authenticator app?

uarcho · 2019-09-25T10:20:38Z

Same here, getting the authentication_cancelled error in simulator, still have to test on a phisical device

lperezj · 2019-09-25T14:05:37Z

@lperezj : does the new simulator have the latest Authenticator app?

I'm testing with IOS 13 simulator. If i test with IOS 12.2 simulator working fine.

jennyf19 · 2019-09-25T14:12:25Z

@jmprieur i don't believe this is related to the iOS broker, looks like an issue with the iOS 13 simulator, as @lperezj points out.
Will investigate.

jmprieur · 2019-09-25T14:15:21Z

@jennyf19 : and it seems at at least some of the affected apps are B2C apps:
@andresbj16, @zachgreencbt @rulasg @lperezj @uarcho are you building b2C apps?

rulasg · 2019-09-25T14:16:58Z

On our case, same project as @lperezj, we are using a corp app using corporative AAD Tenant.

mtanml · 2019-09-25T14:17:39Z

My app is B2C

jmprieur · 2019-09-25T14:18:26Z

Thanks for confirming that both cases are impacted, @rulasg and @mtanml

zachgreencbt · 2019-09-25T14:19:29Z

If it helps, this sample from Microsoft has the same problem, https://github.com/Azure-Samples/active-directory-xamarin-native-v2

jmprieur · 2019-09-25T14:23:23Z

yes, @zachgreencbt, I've noticed your issue there: Azure-Samples/active-directory-xamarin-native-v2#84, and other confirmations

mandel-macaque · 2019-09-25T14:34:32Z

Hello,

Can you please provide the full information of your xamarin.iOS installation, would be good to know if this is happening with a package that support xcode11 or with an older one.

The easiest way to get exact version information:

On Visual Studio for Mac: "Visual Studio" menu, "About Visual Studio" item, "Show Details" button.
On Visual Studio for Windows: "Help menu", "About Microsoft Visual Studio" item.

Then copy/paste the version information (you can use the "Copy Information" button).

The Xcode version information will also be helpful since we have had several releases from Apple. (GM, GM2 or Xcode11 final).

jennyf19 · 2019-09-25T14:35:23Z

@mtanml @andresbj16 @zachgreencbt @rulasg (see above ^) Thanks @mandel-macaque

mtanml · 2019-09-25T14:36:12Z

Hello,

Can you please provide the full information of your xamarin.iOS installation, would be good to know if this is happening with a package that support xcode11 or with an older one.

The easiest way to get exact version information:

On Visual Studio for Mac: "Visual Studio" menu, "About Visual Studio" item, "Show Details" button.

On Visual Studio for Windows: "Help menu", "About Microsoft Visual Studio" item.

Then copy/paste the version information (you can use the "Copy Information" button).

The Xcode version information will also be helpful since we have had several releases from Apple. (GM, GM2 or Xcode11 final).

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mandel-macaque · 2019-09-25T14:38:51Z

@mtanml thanks, that is the correct xamarin.ios for xcode11, we will try to reproduce it in the xamarin-ios side to try and get to the bottom of the issue.

zachgreencbt · 2019-09-25T14:41:13Z

Hello,

Can you please provide the full information of your xamarin.iOS installation, would be good to know if this is happening with a package that support xcode11 or with an older one.

The easiest way to get exact version information:

On Visual Studio for Mac: "Visual Studio" menu, "About Visual Studio" item, "Show Details" button.

On Visual Studio for Windows: "Help menu", "About Microsoft Visual Studio" item.

Then copy/paste the version information (you can use the "Copy Information" button).

The Xcode version information will also be helpful since we have had several releases from Apple. (GM, GM2 or Xcode11 final).

Microsoft Visual Studio Professional 2019
Version 16.3.0
VisualStudio.16.Release/16.3.0+29318.209
Microsoft .NET Framework
Version 4.8.03752

Installed Version: Professional

Visual C++ 2019 00435-20150-13783-AA224
Microsoft Visual C++ 2019

ADL Tools Service Provider 1.0
This package contains services used by Data Lake tools

Application Insights Tools for Visual Studio Package 9.1.00913.1
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 2019 16.3.282.33872
ASP.NET and Web Tools 2019

ASP.NET Web Frameworks and Tools 2019 16.3.282.33872
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0 16.3.282.33872
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Azure Data Lake Node 1.0
This package contains the Data Lake integration nodes for Server Explorer.

Azure Data Lake Tools for Visual Studio 2.3.9000.0
Microsoft Azure Data Lake Tools for Visual Studio

Azure Functions and Web Jobs Tools 16.3.282.33872
Azure Functions and Web Jobs Tools

Azure Stream Analytics Tools for Visual Studio 2.3.9000.0
Microsoft Azure Stream Analytics Tools for Visual Studio

C# Tools 3.3.1-beta3-19461-02+2fd12c210e22f7d6245805c60340f6a34af6875b
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools 1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus 1.2.0 (d16-2@8b56e20)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

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