Resilience on metadata refresh

This document highlights the best practices for refreshing stale metadata across ASP.NET Core, ASP.NET FW, and Microsoft.IdentityModel.

Microsoft.IdentityModel

Recommended: Use latest version 6.10.0+ and follow the metadata guidance.

Code Sample:

ConfigurationManager<OpenIdConnectConfiguration> configManager = 
  new ConfigurationManager<OpenIdConnectConfiguration>("http://someaddress.com", 
                                                       new OpenIdConnectConfigurationRetriever());
OpenIdConnectConfiguration config = await configManager.GetConfigurationAsync().ConfigureAwait(false);
TokenValidationParameters validationParameters = new TokenValidationParameters()
{
  …
  IssuerSigningKeys = config.SigningKeys;
  …
}

JsonWebTokenHandler tokenHandler = new JsonWebTokenHandler();
result = Handler.ValidateToken(jwtToken, validationParameters);
if (result.Exception != null && result.Exception is SecurityTokenSignatureKeyNotFoundException)
{
  configManager.RequestRefresh();
  config = await configManager.GetConfigurationAsync().ConfigureAwait(false);
  validationParameters = new TokenValidationParameters()
  {
    …
    IssuerSigningKeys = config.SigningKeys,
    …
  };
// attempt to validate token again after refresh
  result = Handler.ValidateToken(jwtToken, validationParameters);
}

ASP.NET Core

Recommended: Use latest Wilson (6.10.0+) and manually ensure that you follow the guidelines above.

Ensure that JwtBearerOptions.RefreshOnIssuerKeyNotFound is set to true, and that you are using the latest Microsoft.IdentityModel.* library. This should be enabled by default. All 1p should use SAL with asp.net core.

  services.Configure<JwtBearerOptions>(AzureADDefaults.JwtBearerAuthenticationScheme, options =>
  {
	…
	// shouldn’t be necessary as it’s true by default
	options.RefreshOnIssuerKeyNotFound = true;
	…
   };

ASP.NET/ OWIN

Note: ASP.NET/OWIN is in maintenance mode. Recommended: Use latest Wilson (6.10.0+) and manually ensure that you follow the guidelines above.

OWIN has an automatic 24 hour refresh interval for the OpenIdConnectConfiguration. This refresh will only be triggered if a request is received after the 24 hour time span has passed. As far as we know, there is no way to change this value or trigger a refresh early, aside from restarting the application.