/// <summary>
/// Logs the authentication result.
/// </summary>
/// <param name="authenticationResult">
/// The authentication result to be logged.
/// </param>
private void LogAuthenticationResult(AuthenticationResult authenticationResult)
{
}
/// <summary>
/// Authenticates the request using Bearer scheme.
/// </summary>
/// <param name="request">The request to be authenticated.</param>
/// <returns>
/// An instance of AuthenticationResult which specifies if the authentication was successful or not.
/// If successful, it will contain the IPrincipal.
/// If not successful, it will contain the error message.
/// </returns>
public override AuthenticationResult Authenticate(HttpRequestMessage request)
{
// Validate the request first.
AuthenticationResult authenticationResult;
if (!this.ValidateRequest(request, out authenticationResult))
{
return(authenticationResult);
}
// Validate the token (note that the signature is verified only further down).
SimpleWebToken token;
try
{
string tokenString = request.Headers.Authorization.Parameter;
token = SimpleWebToken.Parse(tokenString);
}
catch (FormatException)
{
return
(AuthenticationResult.CreateFailedAuthenticationResult(
"The bearer token is not in a valid format."));
}
catch (SecurityException exception)
{
return(AuthenticationResult.CreateFailedAuthenticationResult(exception.Message));
}
catch (Exception exception)
{
if (exception.IsFatal())
{
throw;
}
return
(AuthenticationResult.CreateFailedAuthenticationResult(
"An unexpected error occurred while parsing the token."));
}
// Validate issuer.
TokenIssuer tokenIssuer;
if ((!Enum.TryParse(token.Issuer, true, out tokenIssuer)) || (!Enum.IsDefined(typeof(TokenIssuer), token.Issuer)))
{
return(AuthenticationResult.CreateFailedAuthenticationResult(
"Unrecognized token issuer: '{0}'",
token.Issuer));
}
// Validate audience
TokenAudience tokenAudience;
if ((!Enum.TryParse(token.Audience, true, out tokenAudience)) || (!Enum.IsDefined(typeof(TokenAudience), token.Audience)))
{
return(AuthenticationResult.CreateFailedAuthenticationResult(
"Unrecognized token audience: '{0}'",
token.Audience));
}
// Now validate the signature using the specified issuer's keys
bool isSignatureValid = this.IsSignatureValidForIssuer(token, tokenIssuer);
if (!isSignatureValid)
{
return(AuthenticationResult.CreateFailedAuthenticationResult("The token signature is not valid."));
}
// Make sure the token is not expired.
if (token.IsExpiredNow)
{
// Token expired.
return(AuthenticationResult.CreateFailedAuthenticationResult(
"The token expired at {0}",
token.ExpiresOn.ToRoundtripFormatString()));
}
// Identify the roles for this principal.
IEnumerable <Claim> roleClaims = GetRoleClaims(tokenIssuer, tokenAudience);
if (roleClaims == null)
{
return(AuthenticationResult.CreateFailedAuthenticationResult(
"This combination of token issuer and audience is not allowed for this service."));
}
var claims = new List <Claim>();
// We wont allow the caller to specify roles, we will assign the roles here.
claims.AddRange(token.Claims.Where(c => c.Type != HolMonClaimTypes.Role));
// Adding claims as we see fit.
claims.AddRange(roleClaims);
claims.Add(new Claim(HolMonClaimTypes.AuthenticationScheme, this.AuthenticationScheme));
claims.Add(new Claim(HolMonClaimTypes.TokenAudience, token.Audience));
claims.Add(new Claim(HolMonClaimTypes.TokenIssuer, token.Issuer));
this.LogClaims(claims);
var identity = new ClaimsIdentity(claims, request.Headers.Authorization.Scheme);
var principal = new ClaimsPrincipal(identity);
return(AuthenticationResult.CreateSuccessfulAuthenticationResult(principal));
}
