/// <summary>
/// Parses a URL and turns it into authority and discovery endpoint URL.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="path">The path to the discovery document. If not specified this defaults to .well-known/open-id-configuration</param>
/// <returns></returns>
/// <exception cref="System.InvalidOperationException">
/// Malformed URL
/// </exception>
public static DiscoveryEndpoint ParseUrl(string input, string path = null)
{
if (String.IsNullOrEmpty(path))
{
path = OidcConstants.Discovery.DiscoveryEndpoint;
}
var success = Uri.TryCreate(input, UriKind.Absolute, out var uri);
if (success == false)
{
throw new InvalidOperationException("Malformed URL");
}
if (!DiscoveryEndpoint.IsValidScheme(uri))
{
throw new InvalidOperationException("Malformed URL");
}
var url = input.RemoveTrailingSlash();
if (path.StartsWith("/"))
{
path = path.Substring(1);
}
if (url.EndsWith(path, StringComparison.OrdinalIgnoreCase))
{
return(new DiscoveryEndpoint(url.Substring(0, url.Length - path.Length - 1), url));
}
else
{
return(new DiscoveryEndpoint(url, url.EnsureTrailingSlash() + path));
}
}
/// <summary>
/// Validates the endoints and jwks_uri according to the security policy.
/// </summary>
/// <param name="json">The json.</param>
/// <param name="policy">The policy.</param>
/// <returns></returns>
public string ValidateEndpoints(JsonElement json, DiscoveryPolicy policy)
{
// allowed hosts
var allowedHosts = new HashSet <string>(policy.AdditionalEndpointBaseAddresses.Select(e => new Uri(e).Authority))
{
new Uri(policy.Authority).Authority
};
// allowed authorities (hosts + base address)
var allowedAuthorities = new HashSet <string>(policy.AdditionalEndpointBaseAddresses)
{
policy.Authority
};
foreach (var element in json.EnumerateObject())
{
if (element.Name.EndsWith("endpoint", StringComparison.OrdinalIgnoreCase) ||
element.Name.Equals(OidcConstants.Discovery.JwksUri, StringComparison.OrdinalIgnoreCase) ||
element.Name.Equals(OidcConstants.Discovery.CheckSessionIframe, StringComparison.OrdinalIgnoreCase))
{
var endpoint = element.Value.ToString();
var isValidUri = Uri.TryCreate(endpoint, UriKind.Absolute, out Uri uri);
if (!isValidUri)
{
return($"Malformed endpoint: {endpoint}");
}
if (!DiscoveryEndpoint.IsValidScheme(uri))
{
return($"Malformed endpoint: {endpoint}");
}
if (!DiscoveryEndpoint.IsSecureScheme(uri, policy))
{
return($"Endpoint does not use HTTPS: {endpoint}");
}
if (policy.ValidateEndpoints)
{
// if endpoint is on exclude list, don't validate
if (policy.EndpointValidationExcludeList.Contains(element.Name))
{
continue;
}
bool isAllowed = false;
foreach (var host in allowedHosts)
{
if (string.Equals(host, uri.Authority))
{
isAllowed = true;
}
}
if (!isAllowed)
{
return($"Endpoint is on a different host than authority: {endpoint}");
}
IAuthorityValidationStrategy strategy = policy.AuthorityValidationStrategy ?? DiscoveryPolicy.DefaultAuthorityValidationStrategy;
AuthorityValidationResult endpointValidationResult = strategy.IsEndpointValid(endpoint, allowedAuthorities);
if (!endpointValidationResult.Success)
{
return(endpointValidationResult.ErrorMessage);
}
}
}
}
if (policy.RequireKeySet)
{
if (string.IsNullOrWhiteSpace(JwksUri))
{
return("Keyset is missing");
}
}
return(string.Empty);
}
