public string GetClientIdFromClientAssertion(AuthenticateInstruction instruction)
{
if (instruction.ClientAssertionType != "urn:ietf:params:oauth:client-assertion-type:jwt-bearer" || string.IsNullOrWhiteSpace(instruction.ClientAssertion))
{
return(string.Empty);
}
var clientAssertion = instruction.ClientAssertion;
var isJweToken = _jwtParser.IsJweToken(clientAssertion);
var isJwsToken = _jwtParser.IsJwsToken(clientAssertion);
if (isJweToken && isJwsToken)
{
return(string.Empty);
}
if (isJweToken)
{
return(instruction.ClientIdFromHttpRequestBody);
}
var payload = _jwsGenerator.ExtractPayload(clientAssertion);
if (payload == null)
{
return(string.Empty);
}
return(payload.GetClaimValue("iss"));
}
private string TryGettingClientId(AuthenticateInstruction instruction)
{
var clientId = GetClientIdFromClientAssertion(instruction);
if (!string.IsNullOrWhiteSpace(clientId))
{
return(clientId);
}
clientId = instruction.ClientIdFromAuthorizationHeader;
if (!string.IsNullOrWhiteSpace(clientId))
{
return(clientId);
}
return(instruction.ClientIdFromHttpRequestBody);
}
public async Task <BaseClient> Authenticate(AuthenticateInstruction authenticateInstruction, string issuerName, CancellationToken cancellationToken, bool isAuthorizationCodeGrantType = false, string errorCode = ErrorCodes.INVALID_CLIENT)
{
if (authenticateInstruction == null)
{
throw new ArgumentNullException(nameof(authenticateInstruction));
}
BaseClient client = null;
var clientId = TryGettingClientId(authenticateInstruction);
if (!string.IsNullOrWhiteSpace(clientId))
{
client = await _oauthClientRepository.FindOAuthClientById(clientId, cancellationToken);
}
if (client == null)
{
throw new OAuthException(errorCode, string.Format(ErrorMessages.UNKNOWN_CLIENT, clientId));
}
if (isAuthorizationCodeGrantType)
{
return(client);
}
var tokenEndPointAuthMethod = client.TokenEndPointAuthMethod;
var handler = _handlers.FirstOrDefault(h => h.AuthMethod == tokenEndPointAuthMethod);
if (handler == null)
{
throw new OAuthException(errorCode, string.Format(ErrorMessages.UNKNOWN_AUTH_METHOD, tokenEndPointAuthMethod));
}
if (!await handler.Handle(authenticateInstruction, client, issuerName, cancellationToken, errorCode))
{
throw new OAuthException(errorCode, ErrorMessages.BAD_CLIENT_CREDENTIAL);
}
return(client);
}