/// <summary>
/// Performs identifier discovery, creates associations and generates authentication requests
/// on-demand for as long as new ones can be generated based on the results of Identifier discovery.
/// </summary>
/// <param name="userSuppliedIdentifier">The user supplied identifier.</param>
/// <param name="relyingParty">The relying party.</param>
/// <param name="realm">The realm.</param>
/// <param name="returnToUrl">The return_to base URL.</param>
/// <param name="createNewAssociationsAsNeeded">if set to <c>true</c>, associations that do not exist between this Relying Party and the asserting Providers are created before the authentication request is created.</param>
/// <returns>A sequence of authentication requests, any of which constitutes a valid identity assertion on the Claimed Identifier.</returns>
internal static IEnumerable <AuthenticationRequest> Create(Identifier userSuppliedIdentifier, OpenIdRelyingParty relyingParty, Realm realm, Uri returnToUrl, bool createNewAssociationsAsNeeded)
{
// We have a long data validation and preparation process
ErrorUtilities.VerifyArgumentNotNull(userSuppliedIdentifier, "userSuppliedIdentifier");
ErrorUtilities.VerifyArgumentNotNull(relyingParty, "relyingParty");
ErrorUtilities.VerifyArgumentNotNull(realm, "realm");
// Normalize the portion of the return_to path that correlates to the realm for capitalization.
// (so that if a web app base path is /MyApp/, but the URL of this request happens to be
// /myapp/login.aspx, we bump up the return_to Url to use /MyApp/ so it matches the realm.
UriBuilder returnTo = new UriBuilder(returnToUrl);
if (returnTo.Path.StartsWith(realm.AbsolutePath, StringComparison.OrdinalIgnoreCase) &&
!returnTo.Path.StartsWith(realm.AbsolutePath, StringComparison.Ordinal))
{
returnTo.Path = realm.AbsolutePath + returnTo.Path.Substring(realm.AbsolutePath.Length);
returnToUrl = returnTo.Uri;
}
userSuppliedIdentifier = userSuppliedIdentifier.TrimFragment();
if (relyingParty.SecuritySettings.RequireSsl)
{
// Rather than check for successful SSL conversion at this stage,
// We'll wait for secure discovery to fail on the new identifier.
userSuppliedIdentifier.TryRequireSsl(out userSuppliedIdentifier);
}
if (Logger.IsWarnEnabled && returnToUrl.Query != null)
{
NameValueCollection returnToArgs = HttpUtility.ParseQueryString(returnToUrl.Query);
foreach (string key in returnToArgs)
{
if (OpenIdRelyingParty.IsOpenIdSupportingParameter(key))
{
Logger.WarnFormat("OpenID argument \"{0}\" found in return_to URL. This can corrupt an OpenID response.", key);
}
}
}
// Throw an exception now if the realm and the return_to URLs don't match
// as required by the provider. We could wait for the provider to test this and
// fail, but this will be faster and give us a better error message.
ErrorUtilities.VerifyProtocol(realm.Contains(returnToUrl), OpenIdStrings.ReturnToNotUnderRealm, returnToUrl, realm);
// Perform discovery right now (not deferred).
var serviceEndpoints = userSuppliedIdentifier.Discover(relyingParty.WebRequestHandler);
// Call another method that defers request generation.
return(CreateInternal(userSuppliedIdentifier, relyingParty, realm, returnToUrl, serviceEndpoints, createNewAssociationsAsNeeded));
}
/// <summary>
/// Gets all the callback arguments that were previously added using
/// <see cref="IAuthenticationRequest.AddCallbackArguments(string, string)"/> or as a natural part
/// of the return_to URL.
/// </summary>
/// <returns>A name-value dictionary. Never null.</returns>
/// <remarks>
/// Callback parameters are only available if they are complete and untampered with
/// since the original request message (as proven by a signature).
/// If the relying party is operating in stateless mode an empty dictionary is always
/// returned since the callback arguments could not be signed to protect against
/// tampering.
/// </remarks>
public IDictionary <string, string> GetUntrustedCallbackArguments()
{
var args = new Dictionary <string, string>();
// Return all the return_to arguments, except for the OpenID-supporting ones.
// The only arguments that should be returned here are the ones that the host
// web site adds explicitly.
foreach (string key in this.response.GetReturnToParameterNames().Where(key => !OpenIdRelyingParty.IsOpenIdSupportingParameter(key)))
{
args[key] = this.response.GetReturnToArgument(key);
}
return(args);
}
/// <summary>
/// Performs identifier discovery, creates associations and generates authentication requests
/// on-demand for as long as new ones can be generated based on the results of Identifier discovery.
/// </summary>
/// <param name="userSuppliedIdentifier">The user supplied identifier.</param>
/// <param name="relyingParty">The relying party.</param>
/// <param name="realm">The realm.</param>
/// <param name="returnToUrl">The return_to base URL.</param>
/// <param name="createNewAssociationsAsNeeded">if set to <c>true</c>, associations that do not exist between this Relying Party and the asserting Providers are created before the authentication request is created.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A sequence of authentication requests, any of which constitutes a valid identity assertion on the Claimed Identifier.
/// Never null, but may be empty.
/// </returns>
internal static async Task <IEnumerable <AuthenticationRequest> > CreateAsync(Identifier userSuppliedIdentifier, OpenIdRelyingParty relyingParty, Realm realm, Uri returnToUrl, bool createNewAssociationsAsNeeded, CancellationToken cancellationToken)
{
Requires.NotNull(userSuppliedIdentifier, "userSuppliedIdentifier");
Requires.NotNull(relyingParty, "relyingParty");
Requires.NotNull(realm, "realm");
// Normalize the portion of the return_to path that correlates to the realm for capitalization.
// (so that if a web app base path is /MyApp/, but the URL of this request happens to be
// /myapp/login.aspx, we bump up the return_to Url to use /MyApp/ so it matches the realm.
UriBuilder returnTo = new UriBuilder(returnToUrl);
if (returnTo.Path.StartsWith(realm.AbsolutePath, StringComparison.OrdinalIgnoreCase) &&
!returnTo.Path.StartsWith(realm.AbsolutePath, StringComparison.Ordinal))
{
returnTo.Path = realm.AbsolutePath + returnTo.Path.Substring(realm.AbsolutePath.Length);
returnToUrl = returnTo.Uri;
}
userSuppliedIdentifier = userSuppliedIdentifier.TrimFragment();
if (relyingParty.SecuritySettings.RequireSsl)
{
// Rather than check for successful SSL conversion at this stage,
// We'll wait for secure discovery to fail on the new identifier.
if (!userSuppliedIdentifier.TryRequireSsl(out userSuppliedIdentifier))
{
// But at least log the failure.
Logger.OpenId.WarnFormat("RequireSsl mode is on, so discovery on insecure identifier {0} will yield no results.", userSuppliedIdentifier);
}
}
if (Logger.OpenId.IsWarnEnabled && returnToUrl.Query != null)
{
NameValueCollection returnToArgs = HttpUtility.ParseQueryString(returnToUrl.Query);
foreach (string key in returnToArgs)
{
if (OpenIdRelyingParty.IsOpenIdSupportingParameter(key))
{
Logger.OpenId.WarnFormat("OpenID argument \"{0}\" found in return_to URL. This can corrupt an OpenID response.", key);
}
}
}
// Throw an exception now if the realm and the return_to URLs don't match
// as required by the provider. We could wait for the provider to test this and
// fail, but this will be faster and give us a better error message.
ErrorUtilities.VerifyProtocol(realm.Contains(returnToUrl), OpenIdStrings.ReturnToNotUnderRealm, returnToUrl, realm);
// Perform discovery right now (not deferred).
IEnumerable <IdentifierDiscoveryResult> serviceEndpoints;
try {
var identifierDiscoveryResults = await relyingParty.DiscoverAsync(userSuppliedIdentifier, cancellationToken);
var results = identifierDiscoveryResults.CacheGeneratedResults();
// If any OP Identifier service elements were found, we must not proceed
// to use any Claimed Identifier services, per OpenID 2.0 sections 7.3.2.2 and 11.2.
// For a discussion on this topic, see
// http://groups.google.com/group/dotnetopenid/browse_thread/thread/4b5a8c6b2210f387/5e25910e4d2252c8
// Usually the Discover method we called will automatically filter this for us, but
// just to be sure, we'll do it here as well since the RP may be configured to allow
// these dual identifiers for assertion verification purposes.
var opIdentifiers = results.Where(result => result.ClaimedIdentifier == result.Protocol.ClaimedIdentifierForOPIdentifier).CacheGeneratedResults();
var claimedIdentifiers = results.Where(result => result.ClaimedIdentifier != result.Protocol.ClaimedIdentifierForOPIdentifier);
serviceEndpoints = opIdentifiers.Any() ? opIdentifiers : claimedIdentifiers;
} catch (ProtocolException ex) {
Logger.Yadis.ErrorFormat("Error while performing discovery on: \"{0}\": {1}", userSuppliedIdentifier, ex);
serviceEndpoints = Enumerable.Empty <IdentifierDiscoveryResult>();
}
// Filter disallowed endpoints.
serviceEndpoints = relyingParty.SecuritySettings.FilterEndpoints(serviceEndpoints);
// Call another method that defers request generation.
return(await CreateInternalAsync(userSuppliedIdentifier, relyingParty, realm, returnToUrl, serviceEndpoints, createNewAssociationsAsNeeded, cancellationToken));
}