private async Task InvokeCryptographyEndpointAsync()
{
var notification = new CryptographyEndpointContext(Context, Options);
// 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("Cryptography endpoint: invalid method used.");
return;
}
foreach (var credentials in Options.SigningCredentials)
{
// Ignore the key if it's not supported.
if (!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha256Signature) &&
!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha384Signature) &&
!credentials.Key.IsSupportedAlgorithm(SecurityAlgorithms.RsaSha512Signature))
{
Logger.LogDebug("Cryptography endpoint: unsupported signing key ignored. " +
"Only asymmetric security keys supporting RS256, RS384 " +
"or RS512 can be exposed via the JWKS endpoint.");
continue;
}
// Determine whether the security key is a RSA key embedded in a X.509 certificate.
var x509SecurityKey = credentials.Key as X509SecurityKey;
if (x509SecurityKey != null)
{
// Create a new JSON Web Key exposing the
// certificate instead of its public RSA key.
notification.Keys.Add(new JsonWebKey {
Use = JsonWebKeyUseNames.Sig,
Kty = JsonWebAlgorithmsKeyTypes.RSA,
// Resolve the JWA identifier from the algorithm specified in the credentials.
Alg = OpenIdConnectServerHelpers.GetJwtAlgorithm(credentials.Algorithm),
// By default, use the key identifier specified in the signing credentials. If none is specified,
// use the hexadecimal representation of the certificate's SHA-1 hash as the unique key identifier.
Kid = credentials.Kid ?? x509SecurityKey.KeyId ?? x509SecurityKey.Certificate.Thumbprint,
// x5t must be base64url-encoded.
// See http://tools.ietf.org/html/draft-ietf-jose-json-web-key-31#section-4.8
X5t = Base64UrlEncoder.Encode(x509SecurityKey.Certificate.GetCertHash()),
// Unlike E or N, the certificates contained in x5c
// must be base64-encoded and not base64url-encoded.
// See http://tools.ietf.org/html/draft-ietf-jose-json-web-key-31#section-4.7
X5c = { Convert.ToBase64String(x509SecurityKey.Certificate.RawData) }
});
}
var rsaSecurityKey = credentials.Key as RsaSecurityKey;
if (rsaSecurityKey != null)
{
// Export the RSA public key.
notification.Keys.Add(new JsonWebKey {
Use = JsonWebKeyUseNames.Sig,
Kty = JsonWebAlgorithmsKeyTypes.RSA,
// Resolve the JWA identifier from the algorithm specified in the credentials.
Alg = OpenIdConnectServerHelpers.GetJwtAlgorithm(credentials.Algorithm),
// By default, use the key identifier specified in the signing credentials.
// If none is specified, try to extract it from the security key itself or
// create one using the base64url-encoded representation of the modulus.
Kid = credentials.Kid ?? rsaSecurityKey.KeyId ??
// Note: use the first 40 chars to avoid using a too long identifier.
Base64UrlEncoder.Encode(rsaSecurityKey.Parameters.Modulus)
.Substring(0, 40).ToUpperInvariant(),
// Both E and N must be base64url-encoded.
// See http://tools.ietf.org/html/draft-ietf-jose-json-web-key-31#appendix-A.1
E = Base64UrlEncoder.Encode(rsaSecurityKey.Parameters.Exponent),
N = Base64UrlEncoder.Encode(rsaSecurityKey.Parameters.Modulus)
});
}
}
await Options.Provider.CryptographyEndpoint(notification);
if (notification.HandledResponse)
{
return;
}
var payload = new JObject();
var keys = new JArray();
foreach (var key in notification.Keys)
{
var item = new JObject();
// Ensure a key type has been provided.
// See http://tools.ietf.org/html/draft-ietf-jose-json-web-key-31#section-4.1
if (string.IsNullOrEmpty(key.Kty))
{
Logger.LogWarning("Cryptography endpoint: a JSON Web Key didn't " +
"contain the mandatory 'Kty' parameter and has been ignored.");
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.X5t] = key.X5t,
[JsonWebKeyParameterNames.X5u] = key.X5u,
[JsonWebKeyParameterNames.E] = key.E,
[JsonWebKeyParameterNames.N] = key.N
};
foreach (var parameter in parameters)
{
if (!string.IsNullOrEmpty(parameter.Value))
{
item.Add(parameter.Key, parameter.Value);
}
}
if (key.KeyOps.Any())
{
item.Add(JsonWebKeyParameterNames.KeyOps, JArray.FromObject(key.KeyOps));
}
if (key.X5c.Any())
{
item.Add(JsonWebKeyParameterNames.X5c, JArray.FromObject(key.X5c));
}
keys.Add(item);
}
payload.Add(JsonWebKeyParameterNames.Keys, keys);
var context = new CryptographyEndpointResponseContext(Context, Options, payload);
await Options.Provider.CryptographyEndpointResponse(context);
if (context.HandledResponse)
{
return;
}
using (var buffer = new MemoryStream())
using (var writer = new JsonTextWriter(new StreamWriter(buffer))) {
payload.WriteTo(writer);
writer.Flush();
Response.ContentLength = buffer.Length;
Response.ContentType = "application/json;charset=UTF-8";
buffer.Seek(offset: 0, loc: SeekOrigin.Begin);
await buffer.CopyToAsync(Response.Body, 4096, Context.RequestAborted);
}
}
/// <summary> /// Called before the authorization server starts emitting the OpenID Connect JSON Web Key set associated with this instance. /// If the web application wishes to produce the JSON Web Key set directly in this call, it may write to the /// context.Response directly and should call context.RequestCompleted to stop the default behavior from executing. /// </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 CryptographyEndpointResponse(CryptographyEndpointResponseContext context) => OnCryptographyEndpointResponse(context);
/// <summary> /// Called before the authorization server starts emitting the OpenID Connect JSON Web Key set associated with this instance. /// If the web application wishes to produce the JSON Web Key set directly in this call, it may write to the /// context.Response directly and should call context.RequestCompleted to stop the default behavior from executing. /// </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 CryptographyEndpointResponse(CryptographyEndpointResponseContext context) => OnCryptographyEndpointResponse(context);