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 (!string.Equals(Request.Method, "GET", StringComparison.OrdinalIgnoreCase)) { Logger.LogError("The discovery request was rejected because an invalid " + "HTTP method was used: {Method}.", Request.Method); return(await SendCryptographyResponseAsync(new OpenIdConnectResponse { Error = OpenIdConnectConstants.Errors.InvalidRequest, ErrorDescription = "Invalid HTTP method: make sure to use GET." })); } var request = new OpenIdConnectRequest(Request.Query); // Note: set the message type before invoking the ExtractCryptographyRequest event. request.SetProperty(OpenIdConnectConstants.Properties.MessageType, OpenIdConnectConstants.MessageTypes.Cryptography); // Store the discovery request in the ASP.NET context. Context.SetOpenIdConnectRequest(request); var @event = new ExtractCryptographyRequestContext(Context, Options, request); await Options.Provider.ExtractCryptographyRequest(@event); if (@event.HandledResponse) { return(true); } else if (@event.Skipped) { return(false); } else if (@event.IsRejected) { Logger.LogError("The discovery 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 })); } var context = new ValidateCryptographyRequestContext(Context, Options, request); await Options.Provider.ValidateCryptographyRequest(context); if (context.HandledResponse) { return(true); } else if (context.Skipped) { return(false); } else if (!context.IsValidated) { Logger.LogError("The discovery 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, Options, request); foreach (var credentials in Options.SigningCredentials) { // Ignore the key if it's not supported. #if SUPPORTS_ECDSA if (!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha256Signature) && !credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha256Signature) && !credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha384Signature) && !credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha512Signature)) { Logger.LogInformation("An unsupported signing key was ignored and excluded from the " + "key set: {Type}. 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.RsaSha256Signature)) { Logger.LogInformation("An unsupported signing key was ignored and excluded from the " + "key set: {Type}. 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.RsaSha256Signature)) { 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 var x509SecurityKey = credentials.Key as X509SecurityKey; if (x509SecurityKey != null) { algorithm = x509SecurityKey.PublicKey as RSA; } var rsaSecurityKey = credentials.Key as RsaSecurityKey; if (rsaSecurityKey != null) { 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.EcdsaSha256Signature) || credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha384Signature) || credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.EcdsaSha512Signature)) { ECDsa algorithm = null; var x509SecurityKey = credentials.Key as X509SecurityKey; if (x509SecurityKey != null) { algorithm = x509SecurityKey.PublicKey as ECDsa; } var ecdsaSecurityKey = credentials.Key as ECDsaSecurityKey; if (ecdsaSecurityKey != null) { 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 Options.Provider.HandleCryptographyRequest(notification); if (notification.HandledResponse) { return(true); } else if (notification.Skipped) { return(false); } else if (notification.IsRejected) { Logger.LogError("The discovery 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, JArray.FromObject(key.KeyOps)); } if (key.X5c.Count != 0) { item.Add(JsonWebKeyParameterNames.X5c, JArray.FromObject(key.X5c)); } keys.Add(item); } return(await SendCryptographyResponseAsync(new OpenIdConnectResponse { [OpenIdConnectConstants.Parameters.Keys] = keys })); }
/// <summary> /// Called for each request to the cryptography endpoint to give the application code /// a chance to manually extract the cryptography request from the ambient HTTP context. /// </summary> /// <param name="context">The context of the event carries information in and results out.</param> /// <returns>Task to enable asynchronous execution</returns> public virtual Task ExtractCryptographyRequest(ExtractCryptographyRequestContext context) => OnExtractCryptographyRequest(context);