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Detect system-assigned managed identities in AzureCredentialHelper #15885

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Merged
eerhardt merged 1 commit into from
Apr 13, 2026
Merged

Detect system-assigned managed identities in AzureCredentialHelper #15885

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11 changes: 9 additions & 2 deletions src/Shared/AzureCredentialHelper.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,13 +18,20 @@ internal static TokenCredential CreateDefaultAzureCredential()
return new DefaultAzureCredential(DefaultAzureCredential.DefaultEnvironmentVariableName);
}

if (Environment.GetEnvironmentVariable("AZURE_CLIENT_ID") is not null)
if (Environment.GetEnvironmentVariable("AZURE_CLIENT_ID") is string azureClientId)
{
// When we don't see DefaultEnvironmentVariableName, but we do see AZURE_CLIENT_ID,
// we just use ManagedIdentityCredential because that's the only credential type that
// Aspire Hosting enables by default.
// This is also used to support user assigned managed identities in Azure App Service and Azure Functions.
// If this doesn't work for applications, they can override the TokenCredential in their settings.
return new ManagedIdentityCredential(new ManagedIdentityCredentialOptions());
return new ManagedIdentityCredential(new ManagedIdentityCredentialOptions(ManagedIdentityId.FromUserAssignedClientId(azureClientId)));
}
else if (Environment.GetEnvironmentVariable("IDENTITY_ENDPOINT") is not null)
{
// When we see IDENTITY_ENDPOINT, but not AZURE_CLIENT_ID, we assume we're in an Azure
// environment with a system assigned managed identity such as Azure App Service or Azure Functions.
return new ManagedIdentityCredential(new ManagedIdentityCredentialOptions(ManagedIdentityId.SystemAssigned));
}

// when we can't detect a known Azure environment, fall back to the development credential
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