/// <summary>
/// Called when a server requests user authorization
/// </summary>
/// <param name="sender">Server of type <see cref="Server"/> requiring authorization</param>
/// <param name="e">Authorization request event arguments</param>
public void OnRequestAuthorization(object sender, RequestAuthorizationEventArgs e)
{
if (!(sender is Server authenticatingServer))
{
return;
}
e.TokenOrigin = RequestAuthorizationEventArgs.TokenOriginType.None;
e.AccessToken = null;
lock (Properties.Settings.Default.AccessTokenCache)
{
if (e.SourcePolicy != RequestAuthorizationEventArgs.SourcePolicyType.ForceAuthorization)
{
var key = authenticatingServer.Base.AbsoluteUri;
if (Properties.Settings.Default.AccessTokenCache.TryGetValue(key, out var accessToken))
{
if (!e.ForceRefresh && DateTimeOffset.Now < accessToken.Expires)
{
e.TokenOrigin = RequestAuthorizationEventArgs.TokenOriginType.Saved;
e.AccessToken = accessToken;
return;
}
// Token refresh was explicitly requested or the token expired. Refresh it.
if (accessToken is InvalidToken)
{
// Invalid token is not refreshable.
Properties.Settings.Default.AccessTokenCache.Remove(key);
}
else
{
// Get API endpoints. (Not called from the UI thread or already cached by now. Otherwise it would need to be spawned as a background task to avoid deadlock.)
var api = authenticatingServer.GetEndpoints(Window.Abort.Token);
// Prepare web request.
var request = Xml.Response.CreateRequest(api.TokenEndpoint);
try
{
accessToken = accessToken.RefreshToken(request, null, Window.Abort.Token);
// Update access token cache.
Properties.Settings.Default.AccessTokenCache[key] = accessToken;
// If we got here, return the token.
e.TokenOrigin = RequestAuthorizationEventArgs.TokenOriginType.Refreshed;
e.AccessToken = accessToken;
return;
}
catch (AccessTokenException ex)
{
if (ex.ErrorCode == AccessTokenException.ErrorCodeType.InvalidGrant)
{
// The grant has been revoked. Drop the access token.
Properties.Settings.Default.AccessTokenCache.Remove(key);
}
else
{
throw;
}
}
}
}
}
if (e.SourcePolicy != RequestAuthorizationEventArgs.SourcePolicyType.SavedOnly)
{
AuthorizationInProgress = new CancellationTokenSource();
Wizard.TryInvoke((Action)(() =>
{
Wizard.TaskCount++;
ReturnPage = Wizard.CurrentPage;
Wizard.CurrentPage = this;
}));
try
{
// Get API endpoints. (Not called from the UI thread. Otherwise it would need to be spawned as a background task to avoid deadlock.)
var api = authenticatingServer.GetEndpoints(Window.Abort.Token);
// Prepare new authorization grant.
AuthorizationGrant authorizationGrant = null;
Uri callbackUri = null;
var httpListener = new eduOAuth.HttpListener(IPAddress.Loopback, 0);
httpListener.HttpCallback += (object _, HttpCallbackEventArgs eHTTPCallback) =>
{
callbackUri = eHTTPCallback.Uri;
AuthorizationInProgress.Cancel();
Wizard.TryInvoke((Action)(() => Wizard.CurrentPage = ReturnPage));
};
httpListener.HttpRequest += (object _, HttpRequestEventArgs eHTTPRequest) =>
{
if (eHTTPRequest.Uri.AbsolutePath.ToLowerInvariant() == "/favicon.ico")
{
var res = System.Windows.Application.GetResourceStream(new Uri("pack://*****:*****@RETURN_TO@", HttpUtility.UrlEncode(authorizationUri.ToString()))
.Replace("@ORG_ID@", HttpUtility.UrlEncode(srv.OrganizationId)));
}
// Trigger authorization.
Process.Start(authorizationUri.ToString());
// Wait for a change: either callback is invoked, either user cancels.
CancellationTokenSource.CreateLinkedTokenSource(AuthorizationInProgress.Token, Window.Abort.Token).Token.WaitHandle.WaitOne();
}
finally
{
// Delay HTTP server shutdown allowing browser to finish loading content.
new Thread(new ThreadStart(() =>
{
Window.Abort.Token.WaitHandle.WaitOne(5 * 1000);
httpListener.Stop();
})).Start();
}
if (callbackUri == null)
{
throw new OperationCanceledException();
}
// Get access token from authorization grant.
var request = Xml.Response.CreateRequest(api.TokenEndpoint);
e.AccessToken = authorizationGrant.ProcessResponse(
HttpUtility.ParseQueryString(callbackUri.Query),
request,
null,
Window.Abort.Token);
Window.Abort.Token.ThrowIfCancellationRequested();
// Save access token to the cache.
e.TokenOrigin = RequestAuthorizationEventArgs.TokenOriginType.Authorized;
Properties.Settings.Default.AccessTokenCache[authenticatingServer.Base.AbsoluteUri] = e.AccessToken;
}
finally { Wizard.TryInvoke((Action)(() => Wizard.TaskCount--)); }
}
}
}
public void AuthorizationGrantTest()
{
var ag = new AuthorizationGrant(
new Uri("https://test.eduvpn.org/?param=1"),
new Uri("org.eduvpn.app:/api/callback"),
"org.eduvpn.app",
new HashSet <string>()
{
"scope1", "scope2"
});
var uriBuilder = new UriBuilder(ag.AuthorizationUri);
Assert.AreEqual("https", uriBuilder.Scheme);
Assert.AreEqual("test.eduvpn.org", uriBuilder.Host);
Assert.AreEqual("/", uriBuilder.Path);
var query = HttpUtility.ParseQueryString(uriBuilder.Query);
Assert.AreEqual("1", query["param"]);
Assert.AreEqual("code", query["response_type"]);
Assert.AreEqual("org.eduvpn.app", query["client_id"]);
Assert.AreEqual("org.eduvpn.app:/api/callback", query["redirect_uri"]);
CollectionAssert.AreEqual(new List <string>()
{
"scope1", "scope2"
}, query["scope"].Split(null));
Assert.IsTrue(AuthorizationGrant.Base64UriDecodeNoPadding(query["state"]).Length > 0);
Assert.AreEqual("S256", query["code_challenge_method"]);
Assert.IsTrue(AuthorizationGrant.Base64UriDecodeNoPadding(query["code_challenge"]).Length > 0);
var request = new Mock <HttpWebRequest>();
request.Setup(obj => obj.RequestUri).Returns(new Uri("https://demo.eduvpn.nl/portal/oauth.php/token"));
request.SetupSet(obj => obj.Method = "POST");
request.SetupProperty(obj => obj.Credentials);
request.SetupProperty(obj => obj.PreAuthenticate, false);
request.SetupSet(obj => obj.ContentType = "application/x-www-form-urlencoded");
request.SetupProperty(obj => obj.ContentLength);
var request_buffer = new byte[1048576];
request.Setup(obj => obj.GetRequestStream()).Returns(new MemoryStream(request_buffer, true));
var response = new Mock <HttpWebResponse>();
response.Setup(obj => obj.GetResponseStream()).Returns(new MemoryStream(Encoding.UTF8.GetBytes(Global.AccessTokenJSON)));
response.SetupGet(obj => obj.StatusCode).Returns(HttpStatusCode.OK);
request.Setup(obj => obj.GetResponse()).Returns(response.Object);
AccessToken
token1 = new BearerToken(Global.AccessTokenObj, DateTimeOffset.Now),
token2 = ag.ProcessResponse(new NameValueCollection()
{
{ "state", query["state"] }, { "code", "1234567890" }
}, request.Object, new NetworkCredential("", "password").SecurePassword);
var request_param = HttpUtility.ParseQueryString(Encoding.ASCII.GetString(request_buffer, 0, (int)request.Object.ContentLength));
Assert.AreEqual("authorization_code", request_param["grant_type"]);
Assert.IsNotNull(request_param["code"]);
Assert.AreEqual(ag.RedirectEndpoint, request_param["redirect_uri"]);
Assert.AreEqual(ag.ClientId, request_param["client_id"]);
Assert.IsNotNull(request_param["code_verifier"]);
Assert.AreEqual(token1, token2);
Assert.IsTrue((token1.Authorized - token2.Authorized).TotalSeconds < 60);
Assert.IsTrue((token1.Expires - token2.Expires).TotalSeconds < 60);
Assert.IsTrue(token2.Scope != null);
Assert.IsTrue(token1.Scope.SetEquals(token2.Scope));
Assert.ThrowsException <eduJSON.MissingParameterException>(() => ag.ProcessResponse(new NameValueCollection()
{
{ "code", "1234567890" }
}, request.Object));
Assert.ThrowsException <eduJSON.MissingParameterException>(() => ag.ProcessResponse(new NameValueCollection()
{
{ "state", query["state"] }
}, request.Object));
Assert.ThrowsException <InvalidStateException>(() => ag.ProcessResponse(new NameValueCollection()
{
{ "state", AuthorizationGrant.Base64UrlEncodeNoPadding(new byte[] { 0x01, 0x02, 0x03 }) }, { "code", "1234567890" }
}, request.Object));
Assert.ThrowsException <AuthorizationGrantException>(() => ag.ProcessResponse(new NameValueCollection()
{
{ "state", query["state"] }, { "error", "error" }, { "code", "1234567890" }
}, request.Object));
Assert.ThrowsException <eduJSON.MissingParameterException>(() => ag.ProcessResponse(new NameValueCollection()
{
{ "state", query["state"] }
}, request.Object));
}
