private async Task InvokeValidationEndpointAsync()
{
OpenIdConnectMessage request;
// See https://tools.ietf.org/html/rfc7662#section-2.1
// and https://tools.ietf.org/html/rfc7662#section-4
if (string.Equals(Request.Method, "GET", StringComparison.OrdinalIgnoreCase))
{
request = new OpenIdConnectMessage(Request.Query.ToDictionary())
{
RequestType = OpenIdConnectRequestType.AuthenticationRequest
};
}
else if (string.Equals(Request.Method, "POST", StringComparison.OrdinalIgnoreCase))
{
// See http://openid.net/specs/openid-connect-core-1_0.html#FormSerialization
if (string.IsNullOrEmpty(Request.ContentType))
{
await SendErrorPayloadAsync(new OpenIdConnectMessage {
Error = OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = "A malformed validation request has been received: " +
"the mandatory 'Content-Type' header was missing from the POST request."
});
return;
}
// May have media/type; charset=utf-8, allow partial match.
if (!Request.ContentType.StartsWith("application/x-www-form-urlencoded", StringComparison.OrdinalIgnoreCase))
{
await SendErrorPayloadAsync(new OpenIdConnectMessage {
Error = OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = "A malformed validation request has been received: " +
"the 'Content-Type' header contained an unexcepted value. " +
"Make sure to use 'application/x-www-form-urlencoded'."
});
return;
}
var form = await Request.ReadFormAsync(Context.RequestAborted);
request = new OpenIdConnectMessage(form.ToDictionary())
{
RequestType = OpenIdConnectRequestType.AuthenticationRequest
};
}
else
{
Logger.LogInformation("A malformed request has been received by the validation endpoint.");
await SendErrorPageAsync(new OpenIdConnectMessage {
Error = OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = "A malformed validation request has been received: " +
"make sure to use either GET or POST."
});
return;
}
if (string.IsNullOrWhiteSpace(request.GetToken()))
{
await SendErrorPayloadAsync(new OpenIdConnectMessage {
Error = OpenIdConnectConstants.Errors.InvalidRequest,
ErrorDescription = "A malformed validation request has been received: " +
"a 'token' parameter with an access, refresh, or identity token is required."
});
return;
}
// When client_id and client_secret are both null, try to extract them from the Authorization header.
// See http://tools.ietf.org/html/rfc6749#section-2.3.1 and
// http://openid.net/specs/openid-connect-core-1_0.html#ClientAuthentication
if (string.IsNullOrEmpty(request.ClientId) && string.IsNullOrEmpty(request.ClientSecret))
{
string header = Request.Headers[HeaderNames.Authorization];
if (!string.IsNullOrEmpty(header) && header.StartsWith("Basic ", StringComparison.OrdinalIgnoreCase))
{
try {
var value = header.Substring("Basic ".Length).Trim();
var data = Encoding.UTF8.GetString(Convert.FromBase64String(value));
var index = data.IndexOf(':');
if (index >= 0)
{
request.ClientId = data.Substring(0, index);
request.ClientSecret = data.Substring(index + 1);
}
}
catch (FormatException) { }
catch (ArgumentException) { }
}
}
var clientNotification = new ValidateClientAuthenticationContext(Context, Options, request);
await Options.Provider.ValidateClientAuthentication(clientNotification);
// Reject the request if client authentication was rejected.
if (clientNotification.IsRejected)
{
Logger.LogError("The validation request was rejected " +
"because client authentication was invalid.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
// Ensure that the client_id has been set from the ValidateClientAuthentication event.
else if (clientNotification.IsValidated && string.IsNullOrEmpty(request.ClientId))
{
Logger.LogError("Client authentication was validated but the client_id was not set.");
await SendErrorPayloadAsync(new OpenIdConnectMessage {
Error = OpenIdConnectConstants.Errors.ServerError,
ErrorDescription = "An internal server error occurred."
});
return;
}
AuthenticationTicket ticket = null;
// Note: use the "token_type_hint" parameter to determine
// the type of the token sent by the client application.
// See https://tools.ietf.org/html/rfc7662#section-2.1
switch (request.GetTokenTypeHint())
{
case OpenIdConnectConstants.Usages.AccessToken:
ticket = await DeserializeAccessTokenAsync(request.GetToken(), request);
break;
case OpenIdConnectConstants.Usages.RefreshToken:
ticket = await DeserializeRefreshTokenAsync(request.GetToken(), request);
break;
case OpenIdConnectConstants.Usages.IdToken:
ticket = await DeserializeIdentityTokenAsync(request.GetToken(), request);
break;
}
// Note: if the token can't be found using "token_type_hint",
// the search must be extended to all supported token types.
// See https://tools.ietf.org/html/rfc7662#section-2.1
if (ticket == null)
{
ticket = await DeserializeAccessTokenAsync(request.GetToken(), request) ??
await DeserializeIdentityTokenAsync(request.GetToken(), request) ??
await DeserializeRefreshTokenAsync(request.GetToken(), request);
}
if (ticket == null)
{
Logger.LogInformation("The validation request was rejected because the token was invalid.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
// Note: unlike refresh or identity tokens that can only be validated by client applications,
// access tokens can be validated by either resource servers or client applications:
// in both cases, the caller must be authenticated if the ticket is marked as confidential.
if (clientNotification.IsSkipped && ticket.IsConfidential())
{
Logger.LogWarning("The validation request was rejected " +
"because the caller was not authenticated.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
// If the ticket is already expired, directly return active=false.
if (ticket.Properties.ExpiresUtc.HasValue &&
ticket.Properties.ExpiresUtc < Options.SystemClock.UtcNow)
{
Logger.LogDebug("expired token");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
switch (ticket.GetUsage())
{
case OpenIdConnectConstants.Usages.AccessToken: {
// When the caller is authenticated, ensure it is
// listed as a valid audience or authorized presenter.
if (clientNotification.IsValidated && !ticket.HasAudience(clientNotification.ClientId) &&
!ticket.HasPresenter(clientNotification.ClientId))
{
Logger.LogWarning("The validation request was rejected because the access token " +
"was issued to a different client or for another resource server.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
break;
}
case OpenIdConnectConstants.Usages.IdToken: {
// When the caller is authenticated, reject the validation
// request if the caller is not listed as a valid audience.
if (clientNotification.IsValidated && !ticket.HasAudience(clientNotification.ClientId))
{
Logger.LogWarning("The validation request was rejected because the " +
"identity token was issued to a different client.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
break;
}
case OpenIdConnectConstants.Usages.RefreshToken: {
// When the caller is authenticated, reject the validation request if the caller
// doesn't correspond to the client application the token was issued to.
if (clientNotification.IsValidated && !ticket.HasPresenter(clientNotification.ClientId))
{
Logger.LogWarning("The validation request was rejected because the " +
"refresh token was issued to a different client.");
await SendPayloadAsync(new JObject {
[OpenIdConnectConstants.Claims.Active] = false
});
return;
}
break;
}
}
// Insert the validation request in the ASP.NET context.
Context.SetOpenIdConnectRequest(request);
var notification = new ValidationEndpointContext(Context, Options, request, ticket);
notification.Active = true;
// Note: "token_type" may be null when the received token is not an access token.
// See https://tools.ietf.org/html/rfc7662#section-2.2 and https://tools.ietf.org/html/rfc6749#section-5.1
notification.TokenType = ticket.Principal.GetClaim(OpenIdConnectConstants.Claims.TokenType);
notification.Issuer = Context.GetIssuer(Options);
notification.Subject = ticket.Principal.GetClaim(ClaimTypes.NameIdentifier);
notification.IssuedAt = ticket.Properties.IssuedUtc;
notification.ExpiresAt = ticket.Properties.ExpiresUtc;
// Copy the audiences extracted from the "aud" claim.
foreach (var audience in ticket.GetAudiences())
{
notification.Audiences.Add(audience);
}
// Note: non-metadata claims are only added if the caller is authenticated AND is in the specified audiences.
if (clientNotification.IsValidated && notification.Audiences.Contains(clientNotification.ClientId))
{
// Extract the main identity associated with the principal.
var identity = (ClaimsIdentity)ticket.Principal.Identity;
notification.Username = identity.Name;
notification.Scope = ticket.GetProperty(OpenIdConnectConstants.Properties.Scopes);
// Potentially sensitive claims are only exposed to trusted callers
// if the ticket corresponds to an access or identity token.
if (ticket.IsAccessToken() || ticket.IsIdentityToken())
{
foreach (var claim in ticket.Principal.Claims)
{
// Exclude standard claims, that are already handled via strongly-typed properties.
// Make sure to always update this list when adding new built-in claim properties.
if (string.Equals(claim.Type, identity.NameClaimType, StringComparison.Ordinal) ||
string.Equals(claim.Type, ClaimTypes.NameIdentifier, StringComparison.Ordinal))
{
continue;
}
if (string.Equals(claim.Type, JwtRegisteredClaimNames.Aud, StringComparison.Ordinal) ||
string.Equals(claim.Type, JwtRegisteredClaimNames.Exp, StringComparison.Ordinal) ||
string.Equals(claim.Type, JwtRegisteredClaimNames.Iat, StringComparison.Ordinal) ||
string.Equals(claim.Type, JwtRegisteredClaimNames.Iss, StringComparison.Ordinal) ||
string.Equals(claim.Type, JwtRegisteredClaimNames.Nbf, StringComparison.Ordinal) ||
string.Equals(claim.Type, JwtRegisteredClaimNames.Sub, StringComparison.Ordinal))
{
continue;
}
if (string.Equals(claim.Type, OpenIdConnectConstants.Claims.TokenType, StringComparison.Ordinal) ||
string.Equals(claim.Type, OpenIdConnectConstants.Claims.Scope, StringComparison.Ordinal))
{
continue;
}
string type;
// Try to resolve the short name associated with the claim type:
// if none can be found, the claim type is used as-is.
if (!JwtSecurityTokenHandler.DefaultOutboundClaimTypeMap.TryGetValue(claim.Type, out type))
{
type = claim.Type;
}
// Note: make sure to use the indexer
// syntax to avoid duplicate properties.
notification.Claims[type] = claim.Value;
}
}
}
await Options.Provider.ValidationEndpoint(notification);
// Flow the changes made to the authentication ticket.
ticket = notification.AuthenticationTicket;
if (notification.HandledResponse)
{
return;
}
var payload = new JObject();
payload.Add(OpenIdConnectConstants.Claims.Active, notification.Active);
// Only add the other properties if
// the token is considered as active.
if (notification.Active)
{
if (!string.IsNullOrEmpty(notification.Issuer))
{
payload.Add(JwtRegisteredClaimNames.Iss, notification.Issuer);
}
if (!string.IsNullOrEmpty(notification.Username))
{
payload.Add(OpenIdConnectConstants.Claims.Username, notification.Username);
}
if (!string.IsNullOrEmpty(notification.Subject))
{
payload.Add(JwtRegisteredClaimNames.Sub, notification.Subject);
}
if (!string.IsNullOrEmpty(notification.Scope))
{
payload.Add(OpenIdConnectConstants.Claims.Scope, notification.Scope);
}
if (notification.IssuedAt.HasValue)
{
payload.Add(JwtRegisteredClaimNames.Iat, EpochTime.GetIntDate(notification.IssuedAt.Value.UtcDateTime));
payload.Add(JwtRegisteredClaimNames.Nbf, EpochTime.GetIntDate(notification.IssuedAt.Value.UtcDateTime));
}
if (notification.ExpiresAt.HasValue)
{
payload.Add(JwtRegisteredClaimNames.Exp, EpochTime.GetIntDate(notification.ExpiresAt.Value.UtcDateTime));
}
if (!string.IsNullOrEmpty(notification.TokenType))
{
payload.Add(OpenIdConnectConstants.Claims.TokenType, notification.TokenType);
}
switch (notification.Audiences.Count)
{
case 0: break;
case 1:
payload.Add(JwtRegisteredClaimNames.Aud, notification.Audiences[0]);
break;
default:
payload.Add(JwtRegisteredClaimNames.Aud, JArray.FromObject(notification.Audiences));
break;
}
foreach (var claim in notification.Claims)
{
// Ignore claims whose value is null.
if (claim.Value == null)
{
continue;
}
// Note: make sure to use the indexer
// syntax to avoid duplicate properties.
payload[claim.Key] = claim.Value;
}
}
var context = new ValidationEndpointResponseContext(Context, Options, payload);
await Options.Provider.ValidationEndpointResponse(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";
Response.Headers[HeaderNames.CacheControl] = "no-cache";
Response.Headers[HeaderNames.Pragma] = "no-cache";
Response.Headers[HeaderNames.Expires] = "-1";
buffer.Seek(offset: 0, loc: SeekOrigin.Begin);
await buffer.CopyToAsync(Response.Body, 4096, Context.RequestAborted);
}
}
/// <summary> /// Called before the authorization server starts emitting the claims associated with the tokens received. /// If the web application wishes to produce the configuration metadata 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 ValidationEndpointResponse(ValidationEndpointResponseContext context) => OnValidationEndpointResponse(context);
/// <summary> /// Called before the authorization server starts emitting the status and metadata associated with the token received. /// Validation conforms to the OAuth 2.0 Token Introspection specification with some additions. See documentation for details. /// If the web application wishes to produce the status and metadata 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 ValidationEndpointResponse(ValidationEndpointResponseContext context) => OnValidationEndpointResponse(context);
