private async Task <AuthenticationTicket> DeserializeAccessTokenAsync(string token, OpenIdConnectRequest request)
{
var notification = new DeserializeAccessTokenContext(Context, Scheme, Options, request, token)
{
DataFormat = Options.AccessTokenFormat,
SecurityTokenHandler = Options.AccessTokenHandler
};
// Note: ValidateAudience and ValidateLifetime are always set to false:
// if necessary, the audience and the expiration can be validated
// in InvokeIntrospectionEndpointAsync or InvokeTokenEndpointAsync.
notification.TokenValidationParameters = new TokenValidationParameters
{
IssuerSigningKeys = Options.SigningCredentials.Select(credentials => credentials.Key),
NameClaimType = OpenIdConnectConstants.Claims.Name,
RoleClaimType = OpenIdConnectConstants.Claims.Role,
TokenDecryptionKeys = Options.EncryptingCredentials.Select(credentials => credentials.Key)
.Where(key => key is SymmetricSecurityKey),
ValidIssuer = Context.GetIssuer(Options),
ValidateAudience = false,
ValidateLifetime = false
};
await Provider.DeserializeAccessToken(notification);
if (notification.IsHandled || notification.Ticket != null)
{
notification.Ticket?.SetTokenUsage(OpenIdConnectConstants.TokenUsages.AccessToken);
return(notification.Ticket);
}
var handler = notification.SecurityTokenHandler as ISecurityTokenValidator;
if (handler == null)
{
if (notification.DataFormat == null)
{
throw new InvalidOperationException("A security token handler or data formatter must be provided.");
}
var value = notification.DataFormat.Unprotect(token);
if (value == null)
{
Logger.LogTrace("The received token was invalid or malformed: {Token}.", token);
return(null);
}
// Note: since the data formatter relies on a data protector using different "purposes" strings
// per token type, the ticket returned by Unprotect() is guaranteed to be an access token.
value.SetTokenUsage(OpenIdConnectConstants.TokenUsages.AccessToken);
Logger.LogTrace("The access token '{Token}' was successfully validated using " +
"the specified token data format: {Claims} ; {Properties}.",
token, value.Principal.Claims, value.Properties.Items);
return(value);
}
SecurityToken securityToken;
ClaimsPrincipal principal;
try
{
if (!handler.CanReadToken(token))
{
Logger.LogTrace("The access token '{Token}' was rejected by the security token handler.", token);
return(null);
}
principal = handler.ValidateToken(token, notification.TokenValidationParameters, out securityToken);
}
catch (Exception exception)
{
Logger.LogDebug("An exception occured while deserializing an identity token: {Exception}.", exception);
return(null);
}
// Parameters stored in AuthenticationProperties are lost
// when the identity token is serialized using a security token handler.
// To mitigate that, they are inferred from the claims or the security token.
var properties = new AuthenticationProperties
{
ExpiresUtc = securityToken.ValidTo,
IssuedUtc = securityToken.ValidFrom
};
var ticket = new AuthenticationTicket(principal, properties, Scheme.Name)
.SetAudiences(principal.FindAll(OpenIdConnectConstants.Claims.Audience).Select(claim => claim.Value))
.SetConfidentialityLevel(principal.GetClaim(OpenIdConnectConstants.Claims.ConfidentialityLevel))
.SetPresenters(principal.FindAll(OpenIdConnectConstants.Claims.AuthorizedParty).Select(claim => claim.Value))
.SetScopes(principal.FindAll(OpenIdConnectConstants.Claims.Scope).Select(claim => claim.Value))
.SetTokenId(principal.GetClaim(OpenIdConnectConstants.Claims.JwtId))
.SetTokenUsage(principal.GetClaim(OpenIdConnectConstants.Claims.TokenUsage));
// Ensure that the received ticket is an access token.
if (!ticket.IsAccessToken())
{
Logger.LogTrace("The received token was not an access token: {Token}.", token);
return(null);
}
Logger.LogTrace("The access token '{Token}' was successfully validated using " +
"the specified security token handler: {Claims} ; {Properties}.",
token, ticket.Principal.Claims, ticket.Properties.Items);
return(ticket);
}
/// <summary> /// Represents an event called when deserializing an access token. /// </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 DeserializeAccessToken(DeserializeAccessTokenContext context) => OnDeserializeAccessToken(context);
