private async Task <bool> InvokeCryptographyEndpointAsync()
{
// Metadata requests must be made via GET.
// See http://openid.net/specs/openid-connect-discovery-1_0.html#ProviderConfigurationRequest
if (!HttpMethods.IsGet(Request.Method))
{
Logger.LogError("The cryptography request was rejected because an invalid " +
"HTTP method was specified: {Method}.", Request.Method);
return(await SendCryptographyResponseAsync(new OpenIdConnectResponse
{
Error = OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = "The specified HTTP method is not valid."
}));
}
var request = new OpenIdConnectRequest(Request.Query);
// Note: set the message type before invoking the ExtractCryptographyRequest event.
request.SetProperty(OpenIdConnectConstants.Properties.MessageType,
OpenIdConnectConstants.MessageTypes.CryptographyRequest);
// Store the cryptography request in the ASP.NET context.
Context.SetOpenIdConnectRequest(request);
var @event = new ExtractCryptographyRequestContext(Context, Scheme, Options, request);
await Provider.ExtractCryptographyRequest(@event);
if (@event.Result != null)
{
if (@event.Result.Handled)
{
Logger.LogDebug("The cryptography request was handled in user code.");
return(true);
}
else if (@event.Result.Skipped)
{
Logger.LogDebug("The default cryptography request handling was skipped from user code.");
return(false);
}
}
else if (@event.IsRejected)
{
Logger.LogError("The cryptography request was rejected with the following error: {Error} ; {Description}",
/* Error: */ @event.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
/* Description: */ @event.ErrorDescription);
return(await SendCryptographyResponseAsync(new OpenIdConnectResponse
{
Error = @event.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = @event.ErrorDescription,
ErrorUri = @event.ErrorUri
}));
}
Logger.LogInformation("The cryptography request was successfully extracted " +
"from the HTTP request: {Request}.", request);
var context = new ValidateCryptographyRequestContext(Context, Scheme, Options, request);
await Provider.ValidateCryptographyRequest(context);
if (context.Result != null)
{
if (context.Result.Handled)
{
Logger.LogDebug("The cryptography request was handled in user code.");
return(true);
}
else if (context.Result.Skipped)
{
Logger.LogDebug("The default cryptography request handling was skipped from user code.");
return(false);
}
}
else if (context.IsRejected)
{
Logger.LogError("The cryptography request was rejected with the following error: {Error} ; {Description}",
/* Error: */ context.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
/* Description: */ context.ErrorDescription);
return(await SendCryptographyResponseAsync(new OpenIdConnectResponse
{
Error = context.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = context.ErrorDescription,
ErrorUri = context.ErrorUri
}));
}
var notification = new HandleCryptographyRequestContext(Context, Scheme, Options, request);
foreach (var credentials in Options.SigningCredentials)
{
// If the signing key is not an asymmetric key, ignore it.
if (!(credentials.Key is AsymmetricSecurityKey))
{
Logger.LogDebug("A non-asymmetric signing key of type '{Type}' was excluded " +
"from the key set.", credentials.Key.GetType().FullName);
continue;
}
#if SUPPORTS_ECDSA
if (!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha256) &&
!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha256) &&
!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha384) &&
!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha512))
{
Logger.LogInformation("An unsupported signing key of type '{Type}' was ignored and excluded " +
"from the key set. Only RSA and ECDSA asymmetric security keys can be " +
"exposed via the JWKS endpoint.", credentials.Key.GetType().Name);
continue;
}
#else
if (!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha256))
{
Logger.LogInformation("An unsupported signing key of type '{Type}' was ignored and excluded " +
"from the key set. Only RSA asymmetric security keys can be exposed " +
"via the JWKS endpoint.", credentials.Key.GetType().Name);
continue;
}
#endif
var key = new JsonWebKey
{
Use = JsonWebKeyUseNames.Sig,
// Resolve the JWA identifier from the algorithm specified in the credentials.
Alg = OpenIdConnectServerHelpers.GetJwtAlgorithm(credentials.Algorithm),
// Use the key identifier specified in the signing credentials.
Kid = credentials.Kid,
};
if (credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha256))
{
RSA algorithm = null;
// Note: IdentityModel 5 doesn't expose a method allowing to retrieve the underlying algorithm
// from a generic asymmetric security key. To work around this limitation, try to cast
// the security key to the built-in IdentityModel types to extract the required RSA instance.
// See https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/395
if (credentials.Key is X509SecurityKey x509SecurityKey)
{
algorithm = x509SecurityKey.PublicKey as RSA;
}
else if (credentials.Key is RsaSecurityKey rsaSecurityKey)
{
algorithm = rsaSecurityKey.Rsa;
// If no RSA instance can be found, create one using
// the RSA parameters attached to the security key.
if (algorithm == null)
{
var rsa = RSA.Create();
rsa.ImportParameters(rsaSecurityKey.Parameters);
algorithm = rsa;
}
}
// Skip the key if an algorithm instance cannot be extracted.
if (algorithm == null)
{
Logger.LogWarning("A signing key was ignored because it was unable " +
"to provide the requested algorithm instance.");
continue;
}
// Export the RSA public key to create a new JSON Web Key
// exposing the exponent and the modulus parameters.
var parameters = algorithm.ExportParameters(includePrivateParameters: false);
Debug.Assert(parameters.Exponent != null &&
parameters.Modulus != null,
"RSA.ExportParameters() shouldn't return null parameters.");
key.Kty = JsonWebAlgorithmsKeyTypes.RSA;
// Note: both E and N must be base64url-encoded.
// See https://tools.ietf.org/html/rfc7518#section-6.3.1.1
key.E = Base64UrlEncoder.Encode(parameters.Exponent);
key.N = Base64UrlEncoder.Encode(parameters.Modulus);
}
#if SUPPORTS_ECDSA
else if (credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha256) ||
credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha384) ||
credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha512))
{
ECDsa algorithm = null;
if (credentials.Key is X509SecurityKey x509SecurityKey)
{
algorithm = x509SecurityKey.PublicKey as ECDsa;
}
else if (credentials.Key is ECDsaSecurityKey ecdsaSecurityKey)
{
algorithm = ecdsaSecurityKey.ECDsa;
}
// Skip the key if an algorithm instance cannot be extracted.
if (algorithm == null)
{
Logger.LogWarning("A signing key was ignored because it was unable " +
"to provide the requested algorithm instance.");
continue;
}
// Export the ECDsa public key to create a new JSON Web Key
// exposing the coordinates of the point on the curve.
var parameters = algorithm.ExportParameters(includePrivateParameters: false);
Debug.Assert(parameters.Q.X != null &&
parameters.Q.Y != null,
"ECDsa.ExportParameters() shouldn't return null coordinates.");
key.Kty = JsonWebAlgorithmsKeyTypes.EllipticCurve;
key.Crv = OpenIdConnectServerHelpers.GetJwtAlgorithmCurve(parameters.Curve);
// Note: both X and Y must be base64url-encoded.
// See https://tools.ietf.org/html/rfc7518#section-6.2.1.2
key.X = Base64UrlEncoder.Encode(parameters.Q.X);
key.Y = Base64UrlEncoder.Encode(parameters.Q.Y);
}
#endif
// If the signing key is embedded in a X.509 certificate, set
// the x5t and x5c parameters using the certificate details.
var certificate = (credentials.Key as X509SecurityKey)?.Certificate;
if (certificate != null)
{
// x5t must be base64url-encoded.
// See https://tools.ietf.org/html/rfc7517#section-4.8
key.X5t = Base64UrlEncoder.Encode(certificate.GetCertHash());
// Unlike E or N, the certificates contained in x5c
// must be base64-encoded and not base64url-encoded.
// See https://tools.ietf.org/html/rfc7517#section-4.7
key.X5c.Add(Convert.ToBase64String(certificate.RawData));
}
notification.Keys.Add(key);
}
await Provider.HandleCryptographyRequest(notification);
if (notification.Result != null)
{
if (notification.Result.Handled)
{
Logger.LogDebug("The cryptography request was handled in user code.");
return(true);
}
else if (notification.Result.Skipped)
{
Logger.LogDebug("The default cryptography request handling was skipped from user code.");
return(false);
}
}
else if (notification.IsRejected)
{
Logger.LogError("The cryptography request was rejected with the following error: {Error} ; {Description}",
/* Error: */ notification.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
/* Description: */ notification.ErrorDescription);
return(await SendCryptographyResponseAsync(new OpenIdConnectResponse
{
Error = notification.Error ?? OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = notification.ErrorDescription,
ErrorUri = notification.ErrorUri
}));
}
var keys = new JArray();
foreach (var key in notification.Keys)
{
var item = new JObject();
// Ensure a key type has been provided.
// See https://tools.ietf.org/html/rfc7517#section-4.1
if (string.IsNullOrEmpty(key.Kty))
{
Logger.LogError("A JSON Web Key was excluded from the key set because " +
"it didn't contain the mandatory 'kid' parameter.");
continue;
}
// Create a dictionary associating the
// JsonWebKey components with their values.
var parameters = new Dictionary <string, string>
{
[JsonWebKeyParameterNames.Kid] = key.Kid,
[JsonWebKeyParameterNames.Use] = key.Use,
[JsonWebKeyParameterNames.Kty] = key.Kty,
[JsonWebKeyParameterNames.Alg] = key.Alg,
[JsonWebKeyParameterNames.Crv] = key.Crv,
[JsonWebKeyParameterNames.E] = key.E,
[JsonWebKeyParameterNames.N] = key.N,
[JsonWebKeyParameterNames.X] = key.X,
[JsonWebKeyParameterNames.Y] = key.Y,
[JsonWebKeyParameterNames.X5t] = key.X5t,
[JsonWebKeyParameterNames.X5u] = key.X5u
};
foreach (var parameter in parameters)
{
if (!string.IsNullOrEmpty(parameter.Value))
{
item.Add(parameter.Key, parameter.Value);
}
}
if (key.KeyOps.Count != 0)
{
item.Add(JsonWebKeyParameterNames.KeyOps, new JArray(key.KeyOps));
}
if (key.X5c.Count != 0)
{
item.Add(JsonWebKeyParameterNames.X5c, new JArray(key.X5c));
}
keys.Add(item);
}
// Note: AddParameter() is used here to ensure the mandatory "keys" node
// is returned to the caller, even if the key set doesn't expose any key.
// See https://tools.ietf.org/html/rfc7517#section-5 for more information.
var response = new OpenIdConnectResponse();
response.AddParameter(OpenIdConnectConstants.Parameters.Keys, keys);
return(await SendCryptographyResponseAsync(response));
}
/// <summary> /// Represents an event called for each request to the cryptography endpoint /// to determine if the request is valid and should continue to be processed. /// </summary> /// <param name="context">The context instance associated with this event.</param> /// <returns>A <see cref="Task"/> that can be used to monitor the asynchronous operation.</returns> public virtual Task ValidateCryptographyRequest(ValidateCryptographyRequestContext context) => OnValidateCryptographyRequest(context);