private static async Task<OpenIdConnectConfiguration> GetOpenIdConnectConfigurationAsync(RedirectContext context, string defaultPolicy)
{
var manager = (PolicyConfigurationManager)context.Options.ConfigurationManager;
var policy = context.Properties.Items.ContainsKey(AuthenticationConstants.B2CPolicy) ? context.Properties.Items[AuthenticationConstants.B2CPolicy] : defaultPolicy;
var configuration = await manager.GetConfigurationByPolicyAsync(CancellationToken.None, policy);
return configuration;
}
private async Task OnRedirectToIdentityProviderForSignOut(RedirectContext context)
{
AzureAdSettings azureADSettings = GetAdSettings(context);
var configuration = await GetOpenIdConnectConfigurationAsync(context, azureADSettings.B2CPolicySettings.SignInOrSignUpPolicy);
context.ProtocolMessage.IssuerAddress = configuration.EndSessionEndpoint;
}
/// <summary>
/// Called prior to the OIDC middleware redirecting to the authentication endpoint. In the event we are signing up a tenant, we need to
/// put the "admin_consent" value for the prompt query string parameter. AAD uses this to show the admin consent flow.
/// </summary>
/// <param name="context">The <see cref="Microsoft.AspNetCore.Authentication.OpenIdConnect.RedirectContext"/> for this event.</param>
/// <returns>A completed <see cref="System.Threading.Tasks.Task"/></returns>
public override Task RedirectToIdentityProvider(RedirectContext context)
{
if (context.IsSigningUp())
{
context.ProtocolMessage.Prompt = "admin_consent";
}
_logger.RedirectToIdentityProvider();
return Task.FromResult(0);
}
internal static Task RedirectToIdentityProvider(RedirectContext context)
{
eventsFired.Add(nameof(RedirectToIdentityProvider));
if (context.ProtocolMessage.RequestType == OpenIdConnectRequestType.LogoutRequest)
{
context.ProtocolMessage.PostLogoutRedirectUri =
context.Request.Scheme + "://" + context.Request.Host + context.Request.PathBase + new PathString("/Account/Login");
}
return Task.FromResult(0);
}
private static Task Redirect(IConfiguration configuration,
Microsoft.AspNetCore.Authentication.OpenIdConnect.RedirectContext ctx)
{
//ctx.ProtocolMessage.RedirectUri = String.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}{1}", configuration.GetValue<String>(ConfigurationSectionKeys.RedirectHost), configuration.GetValue<String>("AzureAd:CallbackPath"));
return(Task.CompletedTask);
}
/// <summary> /// Invoked before redirecting to the identity provider to sign out. /// </summary> public virtual Task RedirectToIdentityProviderForSignOut(RedirectContext context) => OnRedirectToIdentityProviderForSignOut(context);
/// <summary> /// Invoked before redirecting to the identity provider to authenticate. This can be used to set ProtocolMessage.State /// that will be persisted through the authentication process. The ProtocolMessage can also be used to add or customize /// parameters sent to the identity provider. /// </summary> public virtual Task RedirectToIdentityProvider(RedirectContext context) => OnRedirectToIdentityProvider(context);
/// <summary>
/// Handles Signout
/// </summary>
/// <returns></returns>
protected override async Task HandleSignOutAsync(SignOutContext signout)
{
if (signout != null)
{
if (_configuration == null && Options.ConfigurationManager != null)
{
_configuration = await Options.ConfigurationManager.GetConfigurationAsync(Context.RequestAborted);
}
var message = new OpenIdConnectMessage()
{
IssuerAddress = _configuration == null ? string.Empty : (_configuration.EndSessionEndpoint ?? string.Empty),
};
// Set End_Session_Endpoint in order:
// 1. properties.Redirect
// 2. Options.PostLogoutRedirectUri
var properties = new AuthenticationProperties(signout.Properties);
var logoutRedirectUri = properties.RedirectUri;
if (!string.IsNullOrEmpty(logoutRedirectUri))
{
// Relative to PathBase
if (logoutRedirectUri.StartsWith("/", StringComparison.Ordinal))
{
logoutRedirectUri = BuildRedirectUri(logoutRedirectUri);
}
message.PostLogoutRedirectUri = logoutRedirectUri;
}
else if (!string.IsNullOrEmpty(Options.PostLogoutRedirectUri))
{
logoutRedirectUri = Options.PostLogoutRedirectUri;
// Relative to PathBase
if (logoutRedirectUri.StartsWith("/", StringComparison.Ordinal))
{
logoutRedirectUri = BuildRedirectUri(logoutRedirectUri);
}
message.PostLogoutRedirectUri = logoutRedirectUri;
}
message.IdTokenHint = await Context.Authentication.GetTokenAsync(OpenIdConnectParameterNames.IdToken);
var redirectContext = new RedirectContext(Context, Options, properties)
{
ProtocolMessage = message
};
await Options.Events.RedirectToIdentityProviderForSignOut(redirectContext);
if (redirectContext.HandledResponse)
{
Logger.RedirectToIdentityProviderForSignOutHandledResponse();
return;
}
else if (redirectContext.Skipped)
{
Logger.RedirectToIdentityProviderForSignOutSkipped();
return;
}
message = redirectContext.ProtocolMessage;
if (Options.AuthenticationMethod == OpenIdConnectRedirectBehavior.RedirectGet)
{
var redirectUri = message.CreateLogoutRequestUrl();
if (!Uri.IsWellFormedUriString(redirectUri, UriKind.Absolute))
{
Logger.InvalidLogoutQueryStringRedirectUrl(redirectUri);
}
Response.Redirect(redirectUri);
}
else if (Options.AuthenticationMethod == OpenIdConnectRedirectBehavior.FormPost)
{
var inputs = new StringBuilder();
foreach (var parameter in message.Parameters)
{
var name = HtmlEncoder.Encode(parameter.Key);
var value = HtmlEncoder.Encode(parameter.Value);
var input = string.Format(CultureInfo.InvariantCulture, InputTagFormat, name, value);
inputs.AppendLine(input);
}
var issuer = HtmlEncoder.Encode(message.IssuerAddress);
var content = string.Format(CultureInfo.InvariantCulture, HtmlFormFormat, issuer, inputs);
var buffer = Encoding.UTF8.GetBytes(content);
Response.ContentLength = buffer.Length;
Response.ContentType = "text/html;charset=UTF-8";
// Emit Cache-Control=no-cache to prevent client caching.
Response.Headers[HeaderNames.CacheControl] = "no-cache";
Response.Headers[HeaderNames.Pragma] = "no-cache";
Response.Headers[HeaderNames.Expires] = "-1";
await Response.Body.WriteAsync(buffer, 0, buffer.Length);
}
}
}
/// <summary>
/// Responds to a 401 Challenge. Sends an OpenIdConnect message to the 'identity authority' to obtain an identity.
/// </summary>
/// <returns></returns>
protected override async Task <bool> HandleUnauthorizedAsync(ChallengeContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
Logger.EnteringOpenIdAuthenticationHandlerHandleUnauthorizedAsync(GetType().FullName);
// order for local RedirectUri
// 1. challenge.Properties.RedirectUri
// 2. CurrentUri if RedirectUri is not set)
var properties = new AuthenticationProperties(context.Properties)
{
ExpiresUtc = Options.SystemClock.UtcNow.Add(Options.RemoteAuthenticationTimeout)
};
if (string.IsNullOrEmpty(properties.RedirectUri))
{
properties.RedirectUri = CurrentUri;
}
Logger.PostAuthenticationLocalRedirect(properties.RedirectUri);
if (_configuration == null && Options.ConfigurationManager != null)
{
_configuration = await Options.ConfigurationManager.GetConfigurationAsync(Context.RequestAborted);
}
var message = new OpenIdConnectMessage
{
ClientId = Options.ClientId,
IssuerAddress = _configuration?.AuthorizationEndpoint ?? string.Empty,
RedirectUri = BuildRedirectUri(Options.CallbackPath),
Resource = Options.Resource,
ResponseType = Options.ResponseType,
Scope = string.Join(" ", Options.Scope)
};
// Omitting the response_mode parameter when it already corresponds to the default
// response_mode used for the specified response_type is recommended by the specifications.
// See http://openid.net/specs/oauth-v2-multiple-response-types-1_0.html#ResponseModes
if (!string.Equals(Options.ResponseType, OpenIdConnectResponseTypes.Code, StringComparison.Ordinal) ||
!string.Equals(Options.ResponseMode, OpenIdConnectResponseModes.Query, StringComparison.Ordinal))
{
message.ResponseMode = Options.ResponseMode;
}
if (Options.ProtocolValidator.RequireNonce)
{
message.Nonce = Options.ProtocolValidator.GenerateNonce();
WriteNonceCookie(message.Nonce);
}
GenerateCorrelationId(properties);
var redirectContext = new RedirectContext(Context, Options, properties)
{
ProtocolMessage = message
};
await Options.Events.RedirectToIdentityProvider(redirectContext);
if (redirectContext.HandledResponse)
{
Logger.RedirectToIdentityProviderHandledResponse();
return(true);
}
else if (redirectContext.Skipped)
{
Logger.RedirectToIdentityProviderSkipped();
return(false);
}
message = redirectContext.ProtocolMessage;
if (!string.IsNullOrEmpty(message.State))
{
properties.Items[OpenIdConnectDefaults.UserstatePropertiesKey] = message.State;
}
// When redeeming a 'code' for an AccessToken, this value is needed
properties.Items.Add(OpenIdConnectDefaults.RedirectUriForCodePropertiesKey, message.RedirectUri);
message.State = Options.StateDataFormat.Protect(properties);
if (Options.AuthenticationMethod == OpenIdConnectRedirectBehavior.RedirectGet)
{
var redirectUri = message.CreateAuthenticationRequestUrl();
if (!Uri.IsWellFormedUriString(redirectUri, UriKind.Absolute))
{
Logger.InvalidAuthenticationRequestUrl(redirectUri);
}
Response.Redirect(redirectUri);
return(true);
}
else if (Options.AuthenticationMethod == OpenIdConnectRedirectBehavior.FormPost)
{
var inputs = new StringBuilder();
foreach (var parameter in message.Parameters)
{
var name = HtmlEncoder.Encode(parameter.Key);
var value = HtmlEncoder.Encode(parameter.Value);
var input = string.Format(CultureInfo.InvariantCulture, InputTagFormat, name, value);
inputs.AppendLine(input);
}
var issuer = HtmlEncoder.Encode(message.IssuerAddress);
var content = string.Format(CultureInfo.InvariantCulture, HtmlFormFormat, issuer, inputs);
var buffer = Encoding.UTF8.GetBytes(content);
Response.ContentLength = buffer.Length;
Response.ContentType = "text/html;charset=UTF-8";
// Emit Cache-Control=no-cache to prevent client caching.
Response.Headers[HeaderNames.CacheControl] = "no-cache";
Response.Headers[HeaderNames.Pragma] = "no-cache";
Response.Headers[HeaderNames.Expires] = "-1";
await Response.Body.WriteAsync(buffer, 0, buffer.Length);
return(true);
}
throw new NotImplementedException($"An unsupported authentication method has been configured: {Options.AuthenticationMethod}");
}
public virtual Task RedirectToIdentityProviderForSignOut(RedirectContext context) => OnRedirectToIdentityProviderForSignOut(context);
public virtual Task RedirectToIdentityProvider(RedirectContext context) => OnRedirectToIdentityProvider(context);
