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[BUG] 500 Error when GetToken called in Azure App Service, but not when run locally in VS 2022 #44685

Closed MikeYeager closed 2 months ago

MikeYeager commented 3 months ago

Library name and version

Azure.Identity 1.12.0

Describe the bug

I'm using Managed Identities to get a token in an Azure App Service. This code runs fine locally, but crashes ungracefully when deployed to Azure. My client has their own tenant and have added my login (email) from my azure tenant to their Entra. I found that it's necessary to pass my client's TenantId or the call fails locally. Access to SQL Server via Managed Identities works in newer ASP.NET Core apps, from SSMS, etc. It's only this old ASP.NET 4.8 app using Entity Framework 6 that I have a problem.

I followed these instructions https://learn.microsoft.com/en-us/azure/app-service/tutorial-connect-msi-sql-database?tabs=windowsclient%2Cef%2Cdotnet#3-modify-your-project 

            var credential = new DefaultAzureCredential(new DefaultAzureCredentialOptions
            {
                TenantId = "85cXXXXX-XXXX-XXXX-XXXX-XXXX4c16"    //Client's Azure Tenant ID
            });
            var conn = (System.Data.SqlClient.SqlConnection)Database.Connection;
            var token = credential.GetToken(new Azure.Core.TokenRequestContext(new[] { "https://database.windows.net/.default" }));
            conn.AccessToken = token.Token;

I found this article which recommends changing scope to api://***. That was a slightly more graceful crash that actually allowed logging an error (still a 500 error though). https://github.com/Azure/azure-sdk-for-net/issues/41521

Expected behavior

I would expect to be able to log whatever is causing the issue by getting a .NET exception, not get a 500 error as a result of crashing the process.

Actual behavior

Crashes with 500 error.

Reproduction Steps

Create a new WebAPI project using .NET Framework 4.8. Add these lines of code to one of the sample methods. Run locally - success. Publish to Azure App Service and run from there - 500 error.

Environment

ASP.NET 4.8 Azure Web App

github-actions[bot] commented 3 months ago

Thank you for your feedback. Tagging and routing to the team member best able to assist.

jsquire commented 3 months ago

@MikeYeager: Would you please provide the full error message and stack trace that you're seeing? This sounds like an issue with the MI endpoint on the host rather than the request being made by the credential. The additional context will help us to validate the best path forward for assistance.

github-actions[bot] commented 3 months ago

Hi @MikeYeager. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

MikeYeager commented 3 months ago

Here is the exception info:

Exception Stack:

ManagedIdentityCredential authentication failed: Service request failed. Status: 500 (Internal Server Error)

Content: {"statusCode":500,"message":"An unexpected error occured while fetching the AAD Token.","correlationId":"8997f3a2-4774-4406-bcc2-14da6f7c387a"}

Headers: Transfer-Encoding: chunked X-CORRELATION-ID: REDACTED Content-Type: application/json; charset=utf-8 Date: Thu, 20 Jun 2024 22:40:35 GMT Server: Kestrel

See the troubleshooting guide for more information. https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fu19054072.ct.sendgrid.net%2Fls%2Fclick%3Fupn%3Du001.jY5FA2o0QMCl0M6PhFnw5dYkXNFw1nMhCoCogaarRkW81prb5tlqi1sy4ecWk0aPdP615-2Bnz43gKJGtQkVg7xDOGn-2B-2FNhbkP1haa6zQzj-2F3SZTyZ5fEGOR-2FR2Fiujwog0myc_zqcr9iRqRSjyoMdNqqwpCIDehA9svmT3MXccNrdqzLviqeGMtqlPGrw1HKD8dk853ejwaVBpRgaQ5KgL1jFTUxIEYpvi-2FHpeVKYbtYTNqvfhN0IYuH2U2TyQvGIDgnuYpvRCAp2Xw0bpKCA9el4wTqABu9dMKn6RwH9TPsWVMiYcWqoyA4JuBP6kuTR5h6-2BYjBdBlutdf1BKDXpcHv77qw-3D-3D&data=05%7C02%7Cmyeager%40eps-software.com%7Ccbdef1e062af4c2807c708dc917a0118%7C24db396bb79545c9bcfad3559193f2f7%7C0%7C0%7C638545200432695770%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=C3o0R9HasdbY%2BO2gfG2Bv8XbAtv3Qgr9zIDVGuZovxk%3D&reserved=0 Exception Attributes: Message: ManagedIdentityCredential authentication failed: Service request failed. Status: 500 (Internal Server Error)

Content: {"statusCode":500,"message":"An unexpected error occured while fetching the AAD Token.","correlationId":"8997f3a2-4774-4406-bcc2-14da6f7c387a"}

Headers: Transfer-Encoding: chunked X-CORRELATION-ID: REDACTED Content-Type: application/json; charset=utf-8 Date: Thu, 20 Jun 2024 22:40:35 GMT Server: Kestrel

See the troubleshooting guide for more information. https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fu19054072.ct.sendgrid.net%2Fls%2Fclick%3Fupn%3Du001.jY5FA2o0QMCl0M6PhFnw5dYkXNFw1nMhCoCogaarRkW81prb5tlqi1sy4ecWk0aPdP615-2Bnz43gKJGtQkVg7xDOGn-2B-2FNhbkP1haa6zQzj-2F3SZTyZ5fEGOR-2FR2FiujwogSxe9_zqcr9iRqRSjyoMdNqqwpCIDehA9svmT3MXccNrdqzLviqeGMtqlPGrw1HKD8dk853ejwaVBpRgaQ5KgL1jFTU-2BA3ewbCWE9oFHFITqmLtI9VLHU9v-2FKfMWiU5QhK-2FqO-2BdwdnxRlepk-2BdhEENzaGMZGUlkUjPfm-2FYOv9F4AC4nm6Lr5XeAW5HgQwvyCOf04tILY-2FNu-2B5reqBkw6Hrd-2Fcb-2Fg-3D-3D&data=05%7C02%7Cmyeager%40eps-software.com%7Ccbdef1e062af4c2807c708dc917a0118%7C24db396bb79545c9bcfad3559193f2f7%7C0%7C0%7C638545200432706092%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=Vnrkg%2FNzSaMvbv%2B1zWpDoG1M3aPvZwWZWYzMq%2BOfvfo%3D&reserved=0 Exception type: Azure.Identity.AuthenticationFailedException Source: Azure.Identity Thrown by code in method: FailWrapAndThrow Thrown by code in class: CredentialDiagnosticScope Stack Trace: Method: Azure.Identity.CredentialDiagnosticScope.FailWrapAndThrow(Exception ex, String additionalMessage, Boolean isCredentialUnavailable) Method: Azure.Identity.ManagedIdentityCredential.d16.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentityCredential.GetToken(TokenRequestContext requestContext, CancellationToken cancellationToken) Method: Azure.Identity.DefaultAzureCredential.d14.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.DefaultAzureCredential.d12.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: Azure.Identity.CredentialDiagnosticScope.FailWrapAndThrow(Exception ex, String additionalMessage, Boolean isCredentialUnavailable) Method: Azure.Identity.DefaultAzureCredential.d12.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.DefaultAzureCredential.GetToken(TokenRequestContext requestContext, CancellationToken cancellationToken) Line #: 18 -- Method: RDNG.Reporting.ORM.CIARedDogEntities..ctor() -- Source File: C:\Repos\CIA\RDNG\Reporting\RDNG.Reporting.ORM\Partials\CIARedDogEntities.cs Line #: 24 -- Method: RDNG.ReportGenerator.Reports.IncomeStatementModel.GenerateReport(IncomeStatementParameters parameters, String userLogin) -- Source File: C:\Repos\CIA\RDNG\Reporting\RDNG.ReportGenerator\ReportModels\Accounting\IncomeStatementModel.cs Line #: 170 -- Method: RDNG.ReportingServices.WebAPI.Controllers.AccountingController.IncomeStatement(IncomeStatementParameters parms) -- Source File: C:\Repos\CIA\RDNG\Reporting\RDNG.ReportingServices.WebAPI\Controllers\AccountingController.cs

Service request failed. Status: 500 (Internal Server Error)

Content: {"statusCode":500,"message":"An unexpected error occured while fetching the AAD Token.","correlationId":"8997f3a2-4774-4406-bcc2-14da6f7c387a"}

Headers: Transfer-Encoding: chunked X-CORRELATION-ID: REDACTED Content-Type: application/json; charset=utf-8 Date: Thu, 20 Jun 2024 22:40:35 GMT Server: Kestrel Exception Attributes: Message: Service request failed. Status: 500 (Internal Server Error)

Content: {"statusCode":500,"message":"An unexpected error occured while fetching the AAD Token.","correlationId":"8997f3a2-4774-4406-bcc2-14da6f7c387a"}

Headers: Transfer-Encoding: chunked X-CORRELATION-ID: REDACTED Content-Type: application/json; charset=utf-8 Date: Thu, 20 Jun 2024 22:40:35 GMT Server: Kestrel

Exception type: Azure.RequestFailedException
Source: Azure.Identity
Thrown by code in method: MoveNext
Thrown by code in class: <HandleResponseAsync>d__11

Stack Trace: Method: Azure.Identity.ManagedIdentitySource.d11.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentitySource.d10.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentityClient.d17.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentityClient.d18.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Internal.Requests.ClientCredentialRequest.d5.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Internal.Requests.ClientCredentialRequest.d4.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Internal.Requests.ClientCredentialRequest.d3.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Internal.Requests.RequestBase.<>cDisplayClass11_1.<b1>d.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Utils.StopwatchService.d4.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.Internal.Requests.RequestBase.d11.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Microsoft.Identity.Client.ApiConfig.Executors.ConfidentialClientExecutor.d3.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.AbstractAcquireTokenParameterBuilderExtensions.d0`1.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.MsalConfidentialClient.d21.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.MsalConfidentialClient.d20.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentityClient.d16.MoveNext() Method: --- End of stack trace from previous location where exception was thrown --- Method: System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() Method: System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) Method: Azure.Identity.ManagedIdentityCredential.d__16.MoveNext()

christothes commented 3 months ago

Hi @MikeYeager - Could you try this step from the troubleshooting guide to see if you get a token this way?

github-actions[bot] commented 3 months ago

Hi @MikeYeager. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

MikeYeager commented 3 months ago

Hi @christothes Thanks for responding. I'm just getting back from a trip and want to try this, but am not sure how. It says this: Verify the App Service managed identity endpoint is available If you have access to SSH into the App Service, you can verify managed identity is available in the environment. First ensure the environment variables MSI_ENDPOINT and MSI_SECRET have been set in the environment. Then you can verify the managed identity endpoint is available using curl.

curl 'http://169.254.169.254/metadata/identity/oauth2/token?resource=https://management.core.windows.net&api-version=2018-02-01' -H "Metadata: true"

I don't know where to get the values for MSI_ENDPOINT and MSI_SECRET. Also, the CURL command doesn't seem to use them. Can you give me some guidance?

Thank you, Mike

christothes commented 2 months ago

Hi @MikeYeager - It looks like the docs need to be updated slightly. The environment variables should be set on the host, which should be accessible via your SSH session. For example: echo MSI_ENDPOINT .

The URI you'll want to curl is as follows: curl '{MSI_ENDPOINT}?resource=https://management.core.windows.net&api-version=2019-08-01' -H "Metadata: true" -H "X-IDENTITY-HEADER: {MSI_SECRET}"

github-actions[bot] commented 2 months ago

Hi @MikeYeager. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

MikeYeager commented 2 months ago

Hi @christothes , It's a Windows App Service, but I was able to get into the console, retrieve the environment variables and run it successfully:

image

christothes commented 2 months ago

Hi @MikeYeager - please don't post your actual access token unless it is already expired.

If the endpoint is properly returning a token I'm not sure why you'd be getting the 500 error. Can you reproduce this with logging enabled so that we can see what request is being made to the endpoint? Details can be found here.

github-actions[bot] commented 2 months ago

Hi @MikeYeager. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

MikeYeager commented 2 months ago

@christothes I'm trying to test the logging locally, but not getting any useful output. To be clear, this is a .NET Framework 4.8 services project that's using EF 6. Everything works fine in .NET Core. When I create a console logger and use these diagnostics settings, I get output like this:

The parameters to the Event method do not match the parameters to the WriteEvent method. This may cause the event to be displayed incorrectly.
The parameters to the Event method do not match the parameters to the WriteEvent method. This may cause the event to be displayed incorrectly.
The parameters to the Event method do not match the parameters to the WriteEvent method. This may cause the event to be displayed incorrectly.
The parameters to the Event method do not match the parameters to the WriteEvent method. This may cause the event to be displayed incorrectly.
The parameters to the Event method do not match the parameters to the WriteEvent method. This may cause the event to be displayed incorrectly.

My code looks like this now:

public CIARedDogEntities() : base("name=CIARedDogEntities")
{
    // Setup a listener to monitor logged events.
    using (AzureEventSourceListener listener = AzureEventSourceListener.CreateConsoleLogger())
    {
        //https://github.com/Azure/azure-sdk-for-net/issues/41521 - 500 error when Managed Identities credential get token
        //System-assigned managed identity or logged-in identity of Visual Studio, Visual Studio Code, Azure CLI or Azure PowerShell
        var credential = new DefaultAzureCredential(new DefaultAzureCredentialOptions
        {
            Diagnostics =
            {
                LoggedHeaderNames = { "x-ms-request-id" },
                LoggedQueryParameters = { "api-version" },
                IsAccountIdentifierLoggingEnabled = true
            },
            TenantId = "85cXXXXX-XXXX-XXXX-XXXX-XXXXXXXX4c16"    //Client's Azure Tenant ID
        });
        var conn = (System.Data.SqlClient.SqlConnection)Database.Connection;
        var token = credential.GetToken(new Azure.Core.TokenRequestContext(new[] { "https://database.windows.net/.default" }));
        conn.AccessToken = token.Token;
    }
}
christothes commented 2 months ago

I'm not sure why you are getting the logging errors, but if you are attempting to reproduce this locally, it will not be the same since the managed identity is only available when the app is deployed.

Do you have any logging framework or ILogger in your application? If so, you may need to wire the log output up to that provider using a more advanced logger command as described here. You'd want to replace the Console.Log with whatever you normal logging method is there.

Everything works fine in .NET Core

Just to clarify, are you saying this problem doesn't reproduce at all on .NET Core?

github-actions[bot] commented 2 months ago

Hi @MikeYeager. Thank you for opening this issue and giving us the opportunity to assist. To help our team better understand your issue and the details of your scenario please provide a response to the question asked above or the information requested above. This will help us more accurately address your issue.

MikeYeager commented 2 months ago

@christothes Thank you for all of your help. We never did get logging to work, either locally or when deployed to Azure, but in our attempts to do so, we got an exception message indicating that the User Id was still present in the db connection string in Azure. Once we removed that in the App Service's Environment Variables, it started working. Perhaps someday we'll be able to replace the SSRS reports and get rid of our old .NET Framework 4.8 code. Thank you for all of your help with this.