public async Task <Response> ExecuteAsync(NancyContext context, IResponseFormatter response)
{
if (ConfigurationStore.GetIsEnabled() == false)
{
log.Warn($"{ConfigurationStore.ConfigurationSettingsName} user authentication API was called while the provider was disabled.");
return(ResponseCreator.BadRequest(new string[] { "This authentication provider is disabled." }));
}
var model = modelBinder.Bind <LoginRedirectLinkRequestModel>(context);
var state = model.RedirectAfterLoginTo;
if (string.IsNullOrWhiteSpace(state))
{
state = "/";
}
var whitelist = webPortalConfigurationStore.GetTrustedRedirectUrls();
if (!Requests.IsLocalUrl(state, whitelist))
{
log.WarnFormat("Prevented potential Open Redirection attack on an authentication request, to the non-local url {0}", state);
return(ResponseCreator.BadRequest("Request not allowed, due to potential Open Redirection attack"));
}
var nonce = Nonce.GenerateUrlSafeNonce();
try
{
var issuer = ConfigurationStore.GetIssuer();
var issuerConfig = await identityProviderConfigDiscoverer.GetConfigurationAsync(issuer);
var url = urlBuilder.Build(model.ApiAbsUrl, issuerConfig, nonce, state);
return(ResponseCreator.AsOctopusJson(response, new LoginRedirectLinkResponseModel {
ExternalAuthenticationUrl = url
})
.WithCookie(new NancyCookie("s", State.Protect(state), true, false, DateTime.UtcNow.AddMinutes(20)))
.WithCookie(new NancyCookie("n", Nonce.Protect(nonce), true, false, DateTime.UtcNow.AddMinutes(20))));
}
catch (Exception ex)
{
log.Error(ex);
return(response.AsRedirect($"{state}?error=Login failed. Please see the Octopus Server logs for more details."));
}
}