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Adding Bearer Token to ASP.NET Web API that has Basic Authentication Attribute

I have an ASP.Net Web API 2 with BasicAuthenticationAttribute that is working as expected. In my application, there are different controllers and I want to add bearer token-based authentication to one of my controllers. I added those NuGet packages:
Microsoft.AspNet.WebApi.Owin
Microsoft.Owin.Host.SystemWeb
Microsoft.Owin.Security.OAuth
Here is the WebApiConfig:
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
config.Formatters.JsonFormatter.SerializerSettings.DateTimeZoneHandling =
DateTimeZoneHandling.Local;
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
"DefaultApi",
"api/{controller}/{id}",
new {id = RouteParameter.Optional}
);
config.MessageHandlers.Add(new RequestResponseHandler());
config.Filters.Add(new CustomExceptionFilter());
var resolver = config.DependencyResolver; //Assuming one is set.
var basicAuth = (BasicAuthenticationAttribute)resolver.GetService(typeof(BasicAuthenticationAttribute));
// Web API configuration and services
if (basicAuth != null) config.Filters.Add(basicAuth);
}
}
Here is the Owin Startup
public class Startup
{
public void Configuration(IAppBuilder app)
{
var configuration = GlobalConfiguration.Configuration;
WebApiConfig.Register(configuration);
app.UseWebApi(configuration);
Configure(app);
}
private static void Configure(IAppBuilder app)
{
var options = new OAuthAuthorizationServerOptions()
{
TokenEndpointPath = new Microsoft.Owin.PathString("/token"),
AccessTokenExpireTimeSpan = TimeSpan.FromHours(1),
AllowInsecureHttp = true,
Provider = new AuthorizationServerProvider()
};
app.UseOAuthAuthorizationServer(options);
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
}
}
Here is the controller
[RoutePrefix("api/v2/game/abc101")]
public class A101Controller : ApiController
{
private readonly IGameServicesABC101 _gameServices;
private readonly IMapper _mapper;
public A101Controller(IGameServicesABC101 gameServices, IMapper mapper)
{
_gameServices = gameServices;
_mapper = mapper;
}
[HttpPost]
[Authorize]
[Route("purchase")]
public async Task<IHttpActionResult> PurchaseGame(RequestDto game)
{
if (!ModelState.IsValid) return BadRequest(ModelState);
...
Basic Authentication Attribute
public class BasicAuthenticationAttribute : AuthorizationFilterAttribute
{
private const string Realm = "My Realm";
private readonly Func<IUserValidate> _factory;
public BasicAuthenticationAttribute(Func<IUserValidate> factory)
{
_factory = factory;
}
public override void OnAuthorization(HttpActionContext actionContext)
{
if (actionContext.Request.Headers.Authorization == null)
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
if (actionContext.Response.StatusCode == HttpStatusCode.Unauthorized)
actionContext.Response.Headers.Add("WWW-Authenticate",
$"Basic realm=\"{Realm}\"");
}
else
{
var authenticationToken = actionContext.Request.Headers
.Authorization.Parameter;
try
{
//Decode the string
var decodedAuthenticationToken = Encoding.UTF8.GetString(
Convert.FromBase64String(authenticationToken));
var usernamePasswordArray = decodedAuthenticationToken.Split(':');
var username = usernamePasswordArray[0];
var password = usernamePasswordArray[1];
var uv = _factory();
if (uv.Login(username, password))
{
var identity = new GenericIdentity(username);
IPrincipal principal = new GenericPrincipal(identity, null);
Thread.CurrentPrincipal = principal;
if (HttpContext.Current != null) HttpContext.Current.User = principal;
}
else
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
}
}
catch
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
}
}
}
}
I am using Unity in my application. Basic Authentication works as expected. When I make a request without a token to ...api/v2/game/abc101/purchase I get a response either. Shouldn't I get 401? What I am missing?
UPDATE
I am searching and trying to find how to use both basic authentication and token-based authentication for different controllers. Here is my status update.
There is no code in the Global.asax
Here is the Owin Startup
public class Startup
{
public void Configuration(IAppBuilder app)
{
var config = GlobalConfiguration.Configuration;
WebApiConfig.Register(config);
app.UseWebApi(config);
Configure(app, config.DependencyResolver);
config.EnsureInitialized();
}
private static void Configure(IAppBuilder app, IDependencyResolver resolver)
{
var options = new OAuthAuthorizationServerOptions()
{
TokenEndpointPath = new Microsoft.Owin.PathString("/token"),
AccessTokenExpireTimeSpan = TimeSpan.FromHours(1),
AllowInsecureHttp = true,
Provider = new AuthorizationServerProvider((IUserValidate)resolver.GetService(typeof(IUserValidate)))
};
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
app.UseOAuthAuthorizationServer(options);
}
}
Here is AuthorizationServerProvider
public class AuthorizationServerProvider : OAuthAuthorizationServerProvider
{
private readonly IUserValidate _userValidate;
public AuthorizationServerProvider(IUserValidate userValidate)
{
_userValidate = userValidate;
}
public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
{
if (!context.TryGetBasicCredentials(out var clientId, out var clientSecret))
{
context.SetError("Error", "Error...");
}
if (_userValidate.Login(clientId, clientSecret))
{
context.Validated();
}
}
public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
{
context.OwinContext.Response.Headers.Add("Access-Control-Allow-Origin", new[] { "*" });
context.OwinContext.Response.Headers.Add("Access-Control-Allow-Headers", new[] { "Content-Type" });
if (_userValidate.Login(context.UserName, context.Password))
{
var identity = new ClaimsIdentity(context.Options.AuthenticationType);
identity.AddClaim(new Claim("sub", context.UserName));
identity.AddClaim(new Claim("role", "admin"));
context.Validated(identity);
}
else
{
context.SetError("Error", "Error...");
}
}
}
The rest is the same as the previous code samples.
When I call ...api/v2/game/abc101/purchase I am getting 401, it is progress. But when I call http://localhost:52908/token I am getting unsupported_grant_type. I am sending requests via Postman and I am sending a POST requests with content-type x-www-form-urlencoded. Grant-Type is password and username/password is also correct.
When I call another controller http://localhost:52908/api/v2/game/purchase basic authentication does NOT work!
Hope someone can help.
UPDATE 1
Now I am getting the token, one step at a time :) How can I also use Basic authentication for another controller?
Here is Startup
public class Startup
{
public void Configuration(IAppBuilder app)
{
var config = GlobalConfiguration.Configuration;
Configure(app, config.DependencyResolver);
WebApiConfig.Register(config);
app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
app.UseWebApi(config);
config.EnsureInitialized();
}
private static void Configure(IAppBuilder app, IDependencyResolver resolver)
{
var options = new OAuthAuthorizationServerOptions()
{
AllowInsecureHttp = true,
TokenEndpointPath = new Microsoft.Owin.PathString("/token"),
AccessTokenExpireTimeSpan = TimeSpan.FromHours(1),
Provider = new AuthorizationServerProvider((IUserValidate)resolver.GetService(typeof(IUserValidate)))
};
app.UseOAuthAuthorizationServer(options);
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
}
}
Here is the Authorization Server Provider
public class AuthorizationServerProvider : OAuthAuthorizationServerProvider
{
private readonly IUserValidate _userValidate;
public AuthorizationServerProvider(IUserValidate userValidate)
{
_userValidate = userValidate;
}
public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
{
if (!context.TryGetBasicCredentials(out var clientId, out var clientSecret))
{
context.SetError("invalid_grant", "The user name or password is incorrect.");
}
if (_userValidate.Login(clientId, clientSecret))
{
context.Validated();
}
}
public override async Task GrantResourceOwnerCredentials(OAuthGrantResourceOwnerCredentialsContext context)
{
if (_userValidate.Login(context.UserName, context.Password))
{
var identity = new ClaimsIdentity(context.Options.AuthenticationType);
identity.AddClaim(new Claim("sub", context.UserName));
identity.AddClaim(new Claim("role", "admin"));
context.Validated(identity);
}
else
{
context.SetError("invalid_grant", "The user name or password is incorrect.");
}
}
}
As I mentioned before, I have Basic Authentication Attribute and somehow I have to use it in my other controller.
UPDATE 2
How can I use OverrideAuthentication and my basic authentication attribute?
public class BasicAuthenticationAttribute : AuthorizationFilterAttribute
{
private const string Realm = "My Realm";
private readonly Func<IUserValidate> _factory;
public BasicAuthenticationAttribute(Func<IUserValidate> factory)
{
_factory = factory;
}
...
UPDATE 3
I tried this in my basic authentication attribute OnAuthorization method;
var authentication = DependencyResolver.Current.GetService<IUserValidate>();
if (authentication.Login(username, password))
{
var identity = new GenericIdentity(username);
IPrincipal principal = new GenericPrincipal(identity, null);
Thread.CurrentPrincipal = principal;
if (HttpContext.Current != null) HttpContext.Current.User = principal;
}
There are 2 problems, authentication is null, and somehow authentication token in the attribute is the bearer authentication username/password even though I use basic authentication username/password in the request. It's very weird!
/Get the authentication token from the request header
var authenticationToken = actionContext.Request.Headers
.Authorization.Parameter;
Any help please?
Thanks in advance.

After long googling, here is how I managed to use both basic authentication and bearer authentication for my different controllers.
In Custom basic authentication Attribute I used dependency and requestScope.GetService.
public class CustomBasicAuthenticationAttribute : AuthorizationFilterAttribute
{
[Dependency] public static IUserValidate authentication { get; set; }
private const string Realm = "My Realm";
public override void OnAuthorization(HttpActionContext actionContext)
{
var requestScope = actionContext.Request.GetDependencyScope();
//If the Authorization header is empty or null
//then return Unauthorized
if (actionContext.Request.Headers.Authorization == null)
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
// If the request was unauthorized, add the WWW-Authenticate header
// to the response which indicates that it require basic authentication
if (actionContext.Response.StatusCode == HttpStatusCode.Unauthorized)
actionContext.Response.Headers.Add("WWW-Authenticate",
$"Basic realm=\"{Realm}\"");
}
else
{
//Get the authentication token from the request header
var authenticationToken = actionContext.Request.Headers
.Authorization.Parameter;
try
{
//Decode the string
var decodedAuthenticationToken = Encoding.UTF8.GetString(
Convert.FromBase64String(authenticationToken));
//Convert the string into an string array
var usernamePasswordArray = decodedAuthenticationToken.Split(':');
//First element of the array is the username
var username = usernamePasswordArray[0];
//Second element of the array is the password
var password = usernamePasswordArray[1];
authentication = requestScope.GetService(typeof(IUserValidate)) as IUserValidate;
if (authentication != null && authentication.Login(username, password))
{
var identity = new GenericIdentity(username);
IPrincipal principal = new GenericPrincipal(identity, null);
Thread.CurrentPrincipal = principal;
if (HttpContext.Current != null) HttpContext.Current.User = principal;
}
else
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
}
}
catch
{
actionContext.Response = actionContext.Request
.CreateResponse(HttpStatusCode.Unauthorized);
}
}
}
}
In one of my controller, I added those attributes
[OverrideAuthentication]
[CustomBasicAuthentication]
[HttpPost, Route("purchase")]
public async Task<IHttpActionResult> PurchaseGame(RequestDto game)
{
if (!ModelState.IsValid)
{
return BadRequest(ModelState);
}
...
Now I can use bearer token authentication for ...api/v2/game/abc101/purchase and basic authentication for ...api/v2/game/purchase.
Update
The vital part is the dependency and actionContext.Request.GetDependencyScope();. Without OverrideAuthentication it is working as expected.
Hope this solution helps for others.

I get cookie instead of token with authorization code grant

Summary
I have ASP.NET MVC 5 web app with Identity authentication and I have to develop an API with "grant_type" = "authorization_code". This API will be to provide users data to another "well-known" web service that needs a custom error responses. My IDE is Visual Studio Professional 2017. I use Postman to make requests to my Web API.
Documentation I read
In the OWIN and Katana documentation the OWIN OAuth 2.0 Authorization Server link redirects again to main OWIN and Katana page, but I think that I found the source on GitHub: OWIN OAuth 2.0 Authorization Server. I tried to follow this documentation, but there are no examples about this question.
Problem
I can create a new authorization code in my AuthorizationCodeProvider class (with Create() method) when a user authenticates and authorizes the "well-known" web service client to access user's resources. I store this code in a database. When I request a Token AuthorizationCodeProvider.Receive() method is called and the token is deserialized correctly. Then GrantAuthorizationCode() method is called, Postman receives OK response (200 status code) but without token information in body (.AspNet.ApplicationCookie is in cookies).
Detailed explanation and code
This is the Startup class:
public partial class Startup
{
public static OAuthAuthorizationServerOptions OAuthOptions { get; private set; }
public void ConfigureAuth(IAppBuilder app)
{
app.CreatePerOwinContext(ApplicationDbContext.Create);
app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
LoginPath = new PathString("/Account/Login"),
Provider = new CookieAuthenticationProvider
{
OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
validateInterval: TimeSpan.FromMinutes(30),
regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager)),
OnApplyRedirect = (context =>
{
// This code is to return custom error response
string path = null;
if (context.Request.Path.HasValue)
path = context.Request.Path.Value;
if (!(path != null && path.Contains("/api"))) // Don't redirect to login page
context.Response.Redirect(context.RedirectUri);
})
}
});
app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
app.UseTwoFactorSignInCookie(DefaultAuthenticationTypes.TwoFactorCookie, TimeSpan.FromMinutes(5));
app.UseTwoFactorRememberBrowserCookie(DefaultAuthenticationTypes.TwoFactorRememberBrowserCookie);
this.ConfigureAuthorization(app);
}
private void ConfigureAuthorization(IAppBuilder app)
{
app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
OAuthOptions = new OAuthAuthorizationServerOptions
{
AllowInsecureHttp = false,
TokenEndpointPath = new PathString("/api/token"),
AccessTokenExpireTimeSpan = TimeSpan.FromDays(1),
Provider = new TokenAuthorizationServerProvider(),
AuthorizationCodeProvider = new AuthorizationCodeProvider()
};
app.Use<AuthenticationMiddleware>(); //Customize responses in Token middleware
app.UseOAuthAuthorizationServer(OAuthOptions);
app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
}
}
ConfigureAuthorization() method configures the authorization. It uses classes implemented by me:
AuthenticationMiddleware: the well-known web service wants 401 status responses with custom error JONS instead of the usual 400 status response. It is based on the answer of the question Replace response body using owin middleware.
public class AuthenticationMiddleware : OwinMiddleware
{
public AuthenticationMiddleware(OwinMiddleware next) : base(next) { }
public override async Task Invoke(IOwinContext context)
{
var owinResponse = context.Response;
var owinResponseStream = owinResponse.Body;
var responseBuffer = new MemoryStream();
owinResponse.Body = responseBuffer;
await Next.Invoke(context);
if (context.Response.StatusCode == (int)HttpStatusCode.BadRequest &&
context.Response.Headers.ContainsKey(BearerConstants.CustomUnauthorizedHeaderKey))
{
context.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
string headerValue = context.Response.Headers.Get(BearerConstants.CustomUnauthorizedHeaderKey);
context.Response.Headers.Remove(BearerConstants.CustomUnauthorizedHeaderKey);
ErrorMessage errorMessage = new ErrorMessage(headerValue);
string json = JsonConvert.SerializeObject(errorMessage, Formatting.Indented);
var customResponseBody = new StringContent(json);
var customResponseStream = await customResponseBody.ReadAsStreamAsync();
await customResponseStream.CopyToAsync(owinResponseStream);
owinResponse.ContentType = "application/json";
owinResponse.ContentLength = customResponseStream.Length;
owinResponse.Body = owinResponseStream;
}
}
}
When ErrorMessage is serialized to JSON returns an array of errors:
{
"errors":
[
"message": "the error message"
]
}
I set the BearerConstants.CustomUnauthorizedHeaderKey header in TokenAuthorizationServerProvider.ValidateClientAuthentication() method using a extension method:
public static void Rejected(this OAuthValidateClientAuthenticationContext context, string message)
{
Debug.WriteLine($"\t\t{message}");
context.SetError(message);
context.Response.Headers.Add(BearerConstants.CustomUnauthorizedHeaderKey, new string[] { message });
context.Rejected();
}
This is how TokenAuthorizationServerProvider is implemented:
public class TokenAuthorizationServerProvider : OAuthAuthorizationServerProvider
{
public override Task AuthorizeEndpoint(OAuthAuthorizeEndpointContext context)
{
// Only for breakpoint. Never stops.
return base.AuthorizeEndpoint(context);
}
public override async Task ValidateClientAuthentication(OAuthValidateClientAuthenticationContext context)
{
// Check if grant_type is authorization_code
string grantType = context.Parameters[BearerConstants.GrantTypeKey];
if (string.IsNullOrEmpty(grantType) || grantType != BearerConstants.GrantTypeAuthorizationCode)
{
context.Rejected("Invalid grant type"); // Sets header for custom response
return;
}
// Check if client_id and client_secret are in the request
string clientId = context.Parameters[BearerConstants.ClientIdKey];
string clientSecret = context.Parameters[BearerConstants.ClientSecretKey];
if (string.IsNullOrEmpty(clientId) || string.IsNullOrEmpty(clientSecret))
{
context.Rejected("Client credentials missing"); // Sets header for custom response
return;
}
//Check if client_id and client_secret are valid
ApiClient client = await (new ApiClientService()).ValidateClient(clientId, clientSecret);
if (client != null)
{
// Client has been verified.
Debug.WriteLine($"\t\tClient has been verified");
context.OwinContext.Set<ApiClient>("oauth:client", client);
context.Validated(clientId);
}
else
{
// Client could not be validated.
context.Rejected("Invalid client"); // Sets header for custom response
}
}
public override async Task GrantAuthorizationCode(OAuthGrantAuthorizationCodeContext context)
{
TokenRequestParameters parameters = await context.Request.GetBodyParameters();
using (IUserService userService = new UserService())
{
ApplicationUser user = await userService.ValidateUser(parameters.Code);
if (user == null)
{
context.Rejected("Invalid code");
return;
}
// Initialization.
var claims = new List<Claim>();
// Setting
claims.Add(new Claim(ClaimTypes.Name, user.UserName));
// Setting Claim Identities for OAUTH 2 protocol.
ClaimsIdentity oAuthClaimIdentity = new ClaimsIdentity(claims, OAuthDefaults.AuthenticationType);
ClaimsIdentity cookiesClaimIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationType);
// Setting user authentication.
IDictionary<string, string> data = new Dictionary<string, string>{ { "userName", user.UserName } };
AuthenticationProperties properties = new AuthenticationProperties(data);
AuthenticationTicket ticket = new AuthenticationTicket(oAuthClaimIdentity, properties);
// Grant access to authorize user.
context.Validated(ticket);
context.Request.Context.Authentication.SignIn(cookiesClaimIdentity);
}
}
}
ApiClientService.ValidateClient() checks on database that cliend ID and Secret are correct.
GrantAuthorizationCode() is based on the step 8 from ASP.NET MVC - OAuth 2.0 REST Web API Authorization Using Database First Approach tutorial. But this tutorial for grant_type = password and I think that something is wrong in here.
And the AuthorizationCodeProvider class:
public class AuthorizationCodeProvider : AuthenticationTokenProvider
{
public override void Create(AuthenticationTokenCreateContext context)
{
AuthenticationTicket ticket = context.Ticket;
string serializedTicket = context.SerializeTicket();
context.SetToken(serializedTicket);
}
public override void Receive(AuthenticationTokenReceiveContext context)
{
context.DeserializeTicket(context.Token);
// At this point context.Ticket.Identity.IsAuthenticated is true
}
}
I call to create method from the AuthorizationController that shows the Allow/Deny view. It is decorated with System.Web.Mvc.Authorize attribute, so if the user isn't authenticated he or she has to login using the default login page from MVC template project (/account/login):
[Authorize]
public class AuthorizationController : Controller
{
private const string ServiceScope = "service-name";
[HttpGet]
public async Task<ActionResult> Index(string client_id, string response_type, string redirect_uri, string scope, string state)
{
AuthorizationViewModel vm = new AuthorizationViewModel()
{
ClientId = client_id,
RedirectUri = redirect_uri,
Scope = scope,
State = state
};
if (scope == ServiceScope)
{
var authentication = HttpContext.GetOwinContext().Authentication;
authentication.SignIn(
new AuthenticationProperties { IsPersistent = true, RedirectUri = redirect_uri },
new ClaimsIdentity(new[] { new Claim(ClaimsIdentity.DefaultNameClaimType, User.Identity.Name) },
"Bearer"));
}
return View(vm);
}
[HttpPost]
[ValidateAntiForgeryToken]
[MultiButton(MatchFormKey = "authorization", MatchFormValue = "Allow")]
public async Task<ActionResult> Allow(AuthorizationViewModel vm)
{
if (ModelState.IsValid)
{
string code = await this.SetAuthorizationCode(vm.ClientId, vm.RedirectUri);
if (vm.Scope == ServiceScope)
{
string url = $"{vm.RedirectUri}?code={code}&state={vm.State}";
return Redirect(url);
}
else
{
return Redirect(vm.RedirectUri);
}
}
return View(vm);
}
[HttpPost]
[ValidateAntiForgeryToken]
[MultiButton(MatchFormKey = "authorization", MatchFormValue = "Deny")]
public async Task<ActionResult> Deny(AuthorizationViewModel vm)
{
// Removed for brevity
return View(vm);
}
private async Task<string> SetAuthorizationCode(string clientId, string redirectUri)
{
string userId = User.Identity.GetUserId();
ClaimsIdentity identity = new ClaimsIdentity(new GenericIdentity(clientId, OAuthDefaults.AuthenticationType));
AuthenticationTokenCreateContext authorizeCodeContext = new AuthenticationTokenCreateContext(
HttpContext.GetOwinContext(),
Startup.OAuthOptions.AuthorizationCodeFormat,
new AuthenticationTicket(
identity,
new AuthenticationProperties(new Dictionary<string, string>
{
{ "user_id", userId },
{ "client_id", clientId },
{ "redirect_uri", redirectUri }
})
{
IssuedUtc = DateTimeOffset.UtcNow,
ExpiresUtc = DateTimeOffset.UtcNow.Add(Startup.OAuthOptions.AuthorizationCodeExpireTimeSpan)
}));
Startup.OAuthOptions.AuthorizationCodeProvider.Create(authorizeCodeContext);
string code = authorizeCodeContext.Token;
IUserService userService = new UserService();
await userService.SetAuthorization(userId, true, code); // save to database
userService.Dispose();
return code;
}
}
The authorization code is created in SetAuthorizationCode() method, which is called in Allow() action. This SetAuthorizationCode() method code is based on this answer.
Questions
I now that is very long with a lot of code, but I'm stuck for some days and I didn't find the solution. I don't know the complete flow of the authorization, I think that I'm missing something.
What happens when I call /api/token? I mean, what are the steps in this part of the authentication/authorization flow?
What happens after AuthorizationCodeProvider.GrantAuthorizationCode()?
Why a cookie returned instead of token in the body?

I found the solution of the problem, it was the AuthenticationMiddleware. Once the body of the response is read, it remains empty and does not reach the client. So you have to rewrite the response body.
public class AuthenticationMiddleware : OwinMiddleware
{
public AuthenticationMiddleware(OwinMiddleware next) : base(next) { }
public override async Task Invoke(IOwinContext context)
{
var owinResponse = context.Response;
var owinResponseStream = owinResponse.Body;
var responseBuffer = new MemoryStream();
owinResponse.Body = responseBuffer;
await Next.Invoke(context);
if (context.Response.StatusCode == (int)HttpStatusCode.BadRequest &&
context.Response.Headers.ContainsKey(BearerConstants.CustomUnauthorizedHeaderKey))
{
// Customize the response
}
else
{
// Set body again with the same content
string body = Encoding.UTF8.GetString(responseBuffer.ToArray());
StringContent customResponseBody = new StringContent(body);
Stream customResponseStream = await customResponseBody.ReadAsStreamAsync();
await customResponseStream.CopyToAsync(owinResponseStream);
}
}
}

How to implement permission based authorization in ASP.net core Identity?

I am trying to secure my webAPI using asp.net Identity Core. Now I want to create Roles Dynamically and set and remove permission from/to them and in my admin panel.
for example, I have this permissions list:
register task
assign task
change task status
verify task status
now I want to create different roles and set this permission to them as my needs and assign these roles to each user.
I searched in UserManager and RoleManager of Identity framework but there was no way to create this functionality.
is there any method for implementing this functionality?
I find this useful but this is about dotnet

I find an approach which is using claim and policy for creating a permission-based authorization in this link.
I create a custom claim type such as Application.Permission and then create some classes as following to define my permissions:
public class CustomClaimTypes
{
public const string Permission = "Application.Permission";
}
public static class UserPermissions
{
public const string Add = "users.add";
public const string Edit = "users.edit";
public const string EditRole = "users.edit.role";
}
and then I create My roles and then Assign these permissions as claims to the roles with key ApplicationPermission.
await roleManager.CreateAsync(new ApplicationRole("User"));
var userRole = await roleManager.FindByNameAsync("User");
await roleManager.AddClaimAsync(userRole, new Claim(CustomClaimTypes.Permission, Permissions.User.View));
await roleManager.AddClaimAsync(userRole, new Claim(CustomClaimTypes.Permission, Permissions.Team.View));
in the next step, I add these claims to my token when the user is trying to login to system:
var roles = await _userManager.GetRolesAsync(user);
var userRoles = roles.Select(r => new Claim(ClaimTypes.Role, r)).ToArray();
var userClaims = await _userManager.GetClaimsAsync(user).ConfigureAwait(false);
var roleClaims = await GetRoleClaimsAsync(roles).ConfigureAwait(false);
var claims = new[]
{
new Claim(ClaimTypes.NameIdentifier, user.Id.ToString()),
new Claim(ClaimTypes.Email, user.Email),
new Claim(ClaimTypes.Name, user.UserName)
}.Union(userClaims).Union(roleClaims).Union(userRoles);
var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(_jwtSettings.SigningKey));
var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);
var token = new JwtSecurityToken(
issuer: _jwtSettings.Issuer,
audience: _jwtSettings.Audience,
claims: claims,
expires: DateTime.UtcNow.AddYears(1),
signingCredentials: creds);
then I create my policies this way:
public static class PolicyTypes
{
public static class Users
{
public const string Manage = "users.manage.policy";
public const string EditRole = "users.edit.role.policy";
}
}
then I set up my authorization service inside startup.cs file in ConfigureServiceSection:
services.AddAuthorization(options =>
{
options.AddPolicy(PolicyTypes.Users.Manage, policy => { policy.RequireClaim(CustomClaimTypes.Permission, Permissions.Users.Add); });
options.AddPolicy(PolicyTypes.Users.EditRole, policy => { policy.RequireClaim(CustomClaimTypes.Permission, Permissions.Users.EditRole); });
}
finally, I set policies on my routes and finish:
[Authorize(Policy = PolicyTypes.Users.Manage)]
public async Task<IEnumerable<TeamDto>> GetSubTeams(int parentId)
{
var teams = await _teamService.GetSubTeamsAsync(parentId);
return teams;
}

Another solution could be to use funcs to fullfill a policy, see this example taken from https://learn.microsoft.com/en-us/aspnet/core/security/authorization/policies?view=aspnetcore-3.1:
services.AddAuthorization(options =>
{
options.AddPolicy("BadgeEntry", policy =>
policy.RequireAssertion(context =>
context.User.HasClaim(c =>
(c.Type == "BadgeId" ||
c.Type == "TemporaryBadgeId") &&
c.Issuer == "https://microsoftsecurity")));
});
With this in mind you could make something like the following.
First a class for all of your individual permissions:
public static class PrincipalPermission{
public static List<Func<AuthorizationHandlerContext, bool>> Criteria = new List<Func<AuthorizationHandlerContext, bool>>
{
CanCreateUser
};
public static bool CanCreateUser(this AuthorizationHandlerContext ctx)
{
return ctx.User.IsInRole(RoleEnum.Admin.ToString());
}
}
Then this should be added to your configuration:
services.AddAuthorization(options =>
{
foreach (var criterion in PrincipalPermissions.Criteria)
{
options.AddPolicy(criterion.Method.Name,
policy => policy.RequireAssertion(criterion));
}
}
now this can be added to your controller:
[Authorize(Policy = nameof(PrincipalPermissions.CanCreateUser))]
public async Task<UserDto> Create([FromBody] CreateUserCommand cmd)
{
return await HandleCreateUser(cmd);
}
By the way, if anyone thinks it is annoying to add the methods to a list of Criteria i am right there with you, and i would appreciate if anyone could come up with a better solution :)

Using Azure Active Directory OAuth with Identity Model in ASP.NET Core 2.0

The problem statement
We are developing a new enterprise level application and want to utilize Azure Active Directory for signing into the application so that we do not have to create another set of user credentials. However, our permissions model for this application is more complex than what can be handled via groups inside of AAD.
The thought
The thought was that we could use Azure Active Directory OAuth 2.0 in addition to the ASP.NET Core Identity framework to force users to authenticate through Azure Active Directory and then use the identity framework to handle authorization/permissions.
The Issues
You can create projects out of the box using Azure OpenId authentication and then you can easily add Microsoft account authentication (Not AAD) to any project using Identity framework. But there was nothing built in to add OAuth for AAD to the identity model.
After trying to hack those methods to get them to work like I needed I finally went through trying to home-brew my own solution building off of the OAuthHandler and OAuthOptions classes.
I ran into a lot of issues going down this route but managed to work through most of them. Now I am to a point where I am getting a token back from the endpoint but my ClaimsIdentity doesn't appear to be valid. Then when redirecting to the ExternalLoginCallback my SigninManager is unable to get the external login information.
There almost certainly must be something simple that I am missing but I can't seem to determine what it is.
The Code
Startup.cs
services.AddAuthentication()
.AddAzureAd(options =>
{
options.ClientId = Configuration["AzureAd:ClientId"];
options.AuthorizationEndpoint = $"{Configuration["AzureAd:Instance"]}{Configuration["AzureAd:TenantId"]}/oauth2/authorize";
options.TokenEndpoint = $"{Configuration["AzureAd:Instance"]}{Configuration["AzureAd:TenantId"]}/oauth2/token";
options.UserInformationEndpoint = $"{Configuration["AzureAd:Instance"]}{Configuration["AzureAd:TenantId"]}/openid/userinfo";
options.Resource = Configuration["AzureAd:ClientId"];
options.ClientSecret = Configuration["AzureAd:ClientSecret"];
options.CallbackPath = Configuration["AzureAd:CallbackPath"];
});
AzureADExtensions
namespace Microsoft.AspNetCore.Authentication.AzureAD
{
public static class AzureAdExtensions
{
public static AuthenticationBuilder AddAzureAd(this AuthenticationBuilder builder)
=> builder.AddAzureAd(_ => { });
public static AuthenticationBuilder AddAzureAd(this AuthenticationBuilder builder, Action<AzureAdOptions> configureOptions)
{
return builder.AddOAuth<AzureAdOptions, AzureAdHandler>(AzureAdDefaults.AuthenticationScheme, AzureAdDefaults.DisplayName, configureOptions);
}
public static ChallengeResult ChallengeAzureAD(this ControllerBase controllerBase, SignInManager<ApplicationUser> signInManager, string redirectUrl)
{
return controllerBase.Challenge(signInManager.ConfigureExternalAuthenticationProperties(AzureAdDefaults.AuthenticationScheme, redirectUrl), AzureAdDefaults.AuthenticationScheme);
}
}
}
AzureADOptions & Defaults
public class AzureAdOptions : OAuthOptions
{
public string Instance { get; set; }
public string Resource { get; set; }
public string TenantId { get; set; }
public AzureAdOptions()
{
CallbackPath = new PathString("/signin-azureAd");
AuthorizationEndpoint = AzureAdDefaults.AuthorizationEndpoint;
TokenEndpoint = AzureAdDefaults.TokenEndpoint;
UserInformationEndpoint = AzureAdDefaults.UserInformationEndpoint;
Scope.Add("https://graph.windows.net/user.read");
ClaimActions.MapJsonKey("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name", "unique_name");
ClaimActions.MapJsonKey("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname", "given_name");
ClaimActions.MapJsonKey("http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname", "family_name");
ClaimActions.MapJsonKey("http://schemas.microsoft.com/ws/2008/06/identity/claims/groups", "groups");
ClaimActions.MapJsonKey("http://schemas.microsoft.com/identity/claims/objectidentifier", "oid");
ClaimActions.MapJsonKey("http://schemas.microsoft.com/ws/2008/06/identity/claims/role", "roles");
}
}
public static class AzureAdDefaults
{
public static readonly string DisplayName = "AzureAD";
public static readonly string AuthorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/authorize";
public static readonly string TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/token";
public static readonly string UserInformationEndpoint = "https://login.microsoftonline.com/common/openid/userinfo"; // "https://graph.windows.net/v1.0/me";
public const string AuthenticationScheme = "AzureAD";
}
AzureADHandler
internal class AzureAdHandler : OAuthHandler<AzureAdOptions>
{
public AzureAdHandler(IOptionsMonitor<AzureAdOptions> options, ILoggerFactory logger, UrlEncoder encoder, ISystemClock clock)
: base(options, logger, encoder, clock)
{
}
protected override async Task<AuthenticationTicket> CreateTicketAsync(ClaimsIdentity identity, AuthenticationProperties properties, OAuthTokenResponse tokens)
{
HttpRequestMessage httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, Options.UserInformationEndpoint);
httpRequestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", tokens.AccessToken);
HttpResponseMessage httpResponseMessage = await Backchannel.SendAsync(httpRequestMessage, Context.RequestAborted);
if (!httpResponseMessage.IsSuccessStatusCode)
throw new HttpRequestException(message: $"Failed to retrived Azure AD user information ({httpResponseMessage.StatusCode}) Please check if the authentication information is correct and the corresponding Microsoft Account API is enabled.");
JObject user = JObject.Parse(await httpResponseMessage.Content.ReadAsStringAsync());
OAuthCreatingTicketContext context = new OAuthCreatingTicketContext(new ClaimsPrincipal(identity), properties, Context, Scheme, Options, Backchannel, tokens, user);
context.RunClaimActions();
await Events.CreatingTicket(context);
return new AuthenticationTicket(context.Principal, context.Properties, Scheme.Name);
}
protected override async Task<OAuthTokenResponse> ExchangeCodeAsync(string code, string redirectUri)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
dictionary.Add("grant_type", "authorization_code");
dictionary.Add("client_id", Options.ClientId);
dictionary.Add("redirect_uri", redirectUri);
dictionary.Add("client_secret", Options.ClientSecret);
dictionary.Add(nameof(code), code);
dictionary.Add("resource", Options.Resource);
HttpRequestMessage httpRequestMessage = new HttpRequestMessage(HttpMethod.Post, Options.TokenEndpoint);
httpRequestMessage.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
httpRequestMessage.Content = new FormUrlEncodedContent(dictionary);
HttpResponseMessage response = await Backchannel.SendAsync(httpRequestMessage, Context.RequestAborted);
if (response.IsSuccessStatusCode)
return OAuthTokenResponse.Success(JObject.Parse(await response.Content.ReadAsStringAsync()));
return OAuthTokenResponse.Failed(new Exception(string.Concat("OAuth token endpoint failure: ", await Display(response))));
}
protected override string BuildChallengeUrl(AuthenticationProperties properties, string redirectUri)
{
Dictionary<string, string> dictionary = new Dictionary<string, string>();
dictionary.Add("client_id", Options.ClientId);
dictionary.Add("scope", FormatScope());
dictionary.Add("response_type", "code");
dictionary.Add("redirect_uri", redirectUri);
dictionary.Add("state", Options.StateDataFormat.Protect(properties));
dictionary.Add("resource", Options.Resource);
return QueryHelpers.AddQueryString(Options.AuthorizationEndpoint, dictionary);
}
private static async Task<string> Display(HttpResponseMessage response)
{
StringBuilder output = new StringBuilder();
output.Append($"Status: { response.StatusCode };");
output.Append($"Headers: { response.Headers.ToString() };");
output.Append($"Body: { await response.Content.ReadAsStringAsync() };");
return output.ToString();
}
}
AccountController.cs
[HttpGet]
[AllowAnonymous]
public async Task<IActionResult> SignIn()
{
var redirectUrl = Url.Action(nameof(ExternalLoginCallback), "Account");
return this.ChallengeAzureAD(_signInManager, redirectUrl);
}
[HttpGet]
[AllowAnonymous]
public async Task<IActionResult> ExternalLoginCallback(string returnUrl = null, string remoteError = null)
{
if (remoteError != null)
{
_logger.LogInformation($"Error from external provider: {remoteError}");
return RedirectToAction(nameof(SignedOut));
}
var info = await _signInManager.GetExternalLoginInfoAsync();
if (info == null) //This always ends up true!
{
return RedirectToAction(nameof(SignedOut));
}
}
There you have it!
This is the code I have, and I'm almost sure that at this point there is something simple I am missing but am unsure of what it is. I know that my CreateTicketAsync method is problematic as well since I'm not hitting the correct user information endpoint (or hitting it correctly) but that's another problem all together as from what I understand the claims I care about should come back as part of the token.
Any assistance would be greatly appreciated!

I ended up resolving my own problem as it ended up being several issues. I was passing the wrong value in for the resource field, hadn't set my NameIdentifer mapping correctly and then had the wrong endpoint for pulling down user information. The user information piece being the biggest as that is the token I found out that the external login piece was looking for.
Updated Code
Startup.cs
services.AddAuthentication()
.AddAzureAd(options =>
{
options.ClientId = Configuration["AzureAd:ClientId"];
options.AuthorizationEndpoint = $"{Configuration["AzureAd:Instance"]}{Configuration["AzureAd:TenantId"]}/oauth2/authorize";
options.TokenEndpoint = $"{Configuration["AzureAd:Instance"]}{Configuration["AzureAd:TenantId"]}/oauth2/token";
options.ClientSecret = Configuration["AzureAd:ClientSecret"];
options.CallbackPath = Configuration["AzureAd:CallbackPath"];
});
AzureADOptions & Defaults
public class AzureAdOptions : OAuthOptions
{
public string Instance { get; set; }
public string Resource { get; set; }
public string TenantId { get; set; }
public AzureAdOptions()
{
CallbackPath = new PathString("/signin-azureAd");
AuthorizationEndpoint = AzureAdDefaults.AuthorizationEndpoint;
TokenEndpoint = AzureAdDefaults.TokenEndpoint;
UserInformationEndpoint = AzureAdDefaults.UserInformationEndpoint;
Resource = AzureAdDefaults.Resource;
Scope.Add("user.read");
ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
ClaimActions.MapJsonKey(ClaimTypes.Name, "displayName");
ClaimActions.MapJsonKey(ClaimTypes.GivenName, "givenName");
ClaimActions.MapJsonKey(ClaimTypes.Surname, "surname");
ClaimActions.MapJsonKey(ClaimTypes.MobilePhone, "mobilePhone");
ClaimActions.MapCustomJson(ClaimTypes.Email, user => user.Value<string>("mail") ?? user.Value<string>("userPrincipalName"));
}
}
public static class AzureAdDefaults
{
public static readonly string DisplayName = "AzureAD";
public static readonly string AuthorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/authorize";
public static readonly string TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/token";
public static readonly string Resource = "https://graph.microsoft.com";
public static readonly string UserInformationEndpoint = "https://graph.microsoft.com/v1.0/me";
public const string AuthenticationScheme = "AzureAD";
}

Authorize By Group in Azure Active Directory B2C

I am trying to figure out how to authorize using groups in Azure Active Directory B2C. I can Authorize via User, for example:
[Authorize(Users="Bill")]
However, this is not very effective and I see very few use-cases for this. An alternate solution would be Authorizing via Role. However for some reason that does not seem to work. It does not work if I give a user the Role "Global Admin" for example, and try:
[Authorize(Roles="Global Admin")]
Is there a way to authorize via Groups or Roles?

Obtaining group memberships for a user from Azure AD requires quite a bit more than just "a couple lines of code", so I thought I'd share what finally worked for me to save others a few days worth of hair-pulling and head-banging.
Let's begin by adding the following dependencies to project.json:
"dependencies": {
...
"Microsoft.IdentityModel.Clients.ActiveDirectory": "3.13.8",
"Microsoft.Azure.ActiveDirectory.GraphClient": "2.0.2"
}
The first one is necessary as we need to authenticate our application in order for it to be able to access AAD Graph API.
The second one is the Graph API client library we'll be using to query user memberships.
It goes without saying that the versions are only valid as of the time of this writing and may change in the future.
Next, in the Configure() method of the Startup class, perhaps just before we configure OpenID Connect authentication, we create the Graph API client as follows:
var authContext = new AuthenticationContext("https://login.microsoftonline.com/<your_directory_name>.onmicrosoft.com");
var clientCredential = new ClientCredential("<your_b2c_app_id>", "<your_b2c_secret_app_key>");
const string AAD_GRAPH_URI = "https://graph.windows.net";
var graphUri = new Uri(AAD_GRAPH_URI);
var serviceRoot = new Uri(graphUri, "<your_directory_name>.onmicrosoft.com");
this.aadClient = new ActiveDirectoryClient(serviceRoot, async () => await AcquireGraphAPIAccessToken(AAD_GRAPH_URI, authContext, clientCredential));
WARNING: DO NOT hard-code your secret app key but instead keep it in a secure place. Well, you already knew that, right? :)
The asynchronous AcquireGraphAPIAccessToken() method that we handed to the AD client constructor will be called as necessary when the client needs to obtain authentication token. Here's what the method looks like:
private async Task<string> AcquireGraphAPIAccessToken(string graphAPIUrl, AuthenticationContext authContext, ClientCredential clientCredential)
{
AuthenticationResult result = null;
var retryCount = 0;
var retry = false;
do
{
retry = false;
try
{
// ADAL includes an in-memory cache, so this will only send a request if the cached token has expired
result = await authContext.AcquireTokenAsync(graphAPIUrl, clientCredential);
}
catch (AdalException ex)
{
if (ex.ErrorCode == "temporarily_unavailable")
{
retry = true;
retryCount++;
await Task.Delay(3000);
}
}
} while (retry && (retryCount < 3));
if (result != null)
{
return result.AccessToken;
}
return null;
}
Note that it has a built-in retry mechanism for handling transient conditions, which you may want to tailor to your application's needs.
Now that we have taken care of application authentication and AD client setup, we can go ahead and tap into OpenIdConnect events to finally make use of it.
Back in the Configure() method where we'd typically call app.UseOpenIdConnectAuthentication() and create an instance of OpenIdConnectOptions, we add an event handler for the OnTokenValidated event:
new OpenIdConnectOptions()
{
...
Events = new OpenIdConnectEvents()
{
...
OnTokenValidated = SecurityTokenValidated
},
};
The event is fired when access token for the signing-in user has been obtained, validated and user identity established. (Not to be confused with the application's own access token required to call AAD Graph API!)
It looks like a good place for querying Graph API for user's group memberships and adding those groups onto the identity, in the form of additional claims:
private Task SecurityTokenValidated(TokenValidatedContext context)
{
return Task.Run(async () =>
{
var oidClaim = context.SecurityToken.Claims.FirstOrDefault(c => c.Type == "oid");
if (!string.IsNullOrWhiteSpace(oidClaim?.Value))
{
var pagedCollection = await this.aadClient.Users.GetByObjectId(oidClaim.Value).MemberOf.ExecuteAsync();
do
{
var directoryObjects = pagedCollection.CurrentPage.ToList();
foreach (var directoryObject in directoryObjects)
{
var group = directoryObject as Group;
if (group != null)
{
((ClaimsIdentity)context.Ticket.Principal.Identity).AddClaim(new Claim(ClaimTypes.Role, group.DisplayName, ClaimValueTypes.String));
}
}
pagedCollection = pagedCollection.MorePagesAvailable ? await pagedCollection.GetNextPageAsync() : null;
}
while (pagedCollection != null);
}
});
}
Used here is the Role claim type, however you could use a custom one.
Having done the above, if you're using ClaimType.Role, all you need to do is decorate your controller class or method like so:
[Authorize(Role = "Administrators")]
That is, of course, provided you have a designated group configured in B2C with a display name of "Administrators".
If, however, you chose to use a custom claim type, you'd need to define an authorization policy based on the claim type by adding something like this in the ConfigureServices() method, e.g.:
services.AddAuthorization(options => options.AddPolicy("ADMIN_ONLY", policy => policy.RequireClaim("<your_custom_claim_type>", "Administrators")));
and then decorate a privileged controller class or method as follows:
[Authorize(Policy = "ADMIN_ONLY")]
Ok, are we done yet? - Well, not exactly.
If you ran your application and tried signing in, you'd get an exception from Graph API claiming "Insufficient privileges to complete the operation".
It may not be obvious, but while your application authenticates successfully with AD using its app_id and app_key, it doesn't have the privileges required to read the details of users from your AD.
In order to grant the application such access, I chose to use the Azure Active Directory Module for PowerShell
The following script did the trick for me:
$tenantGuid = "<your_tenant_GUID>"
$appID = "<your_app_id>"
$userVal = "<admin_user>#<your_AD>.onmicrosoft.com"
$pass = "<admin password in clear text>"
$Creds = New-Object System.Management.Automation.PsCredential($userVal, (ConvertTo-SecureString $pass -AsPlainText -Force))
Connect-MSOLSERVICE -Credential $Creds
$msSP = Get-MsolServicePrincipal -AppPrincipalId $appID -TenantID $tenantGuid
$objectId = $msSP.ObjectId
Add-MsolRoleMember -RoleName "Company Administrator" -RoleMemberType ServicePrincipal -RoleMemberObjectId $objectId
And now we're finally done!
How's that for "a couple lines of code"? :)

This will work, however you have to write a couple of lines of code in your authentication logic in order to achieve what you're looking for.
First of all, you have to distinguish between Roles and Groups in Azure AD (B2C).
User Role is very specific and only valid within Azure AD (B2C) itself. The Role defines what permissions a user does have inside Azure AD .
Group (or Security Group) defines user group membership, which can be exposed to the external applications. The external applications can model Role based access control on top of Security Groups. Yes, I know it may sound a bit confusing, but that's what it is.
So, your first step is to model your Groups in Azure AD B2C - you have to create the groups and manually assign users to those groups. You can do that in the Azure Portal (https://portal.azure.com/):
Then, back to your application, you will have to code a bit and ask the Azure AD B2C Graph API for users memberships once the user is successfully authenticated. You can use this sample to get inspired on how to get users group memberships. It is best to execute this code in one of the OpenID Notifications (i.e. SecurityTokenValidated) and add users role to the ClaimsPrincipal.
Once you change the ClaimsPrincipal to have Azure AD Security Groups and "Role Claim" values, you will be able to use the Authrize attribute with Roles feature. This is really 5-6 lines of code.
Finally, you can give your vote for the feature here in order to get group membership claim without having to query Graph API for that.

i implmented this as written , but as of May 2017 the line
((ClaimsIdentity)context.Ticket.Principal.Identity).AddClaim(new Claim(ClaimTypes.Role, group.DisplayName, ClaimValueTypes.String));
needs to be changed to
((ClaimsIdentity)context.Ticket.Principal.Identity).AddClaim(new Claim(ClaimTypes.Role, group.DisplayName));
To make it work with latest libs
Great work to the author
Also if your having a problem with Connect-MsolService giving bad username and password update to latest lib

Alex's answer is essential to figure out a working solution, thanks for pointing to the right direction.
However it uses app.UseOpenIdConnectAuthentication() which was long time depreciated already in Core 2 and completely removed in Core 3 (Migrate authentication and Identity to ASP.NET Core 2.0)
The fundamental task we must implement is attach an event handler to OnTokenValidated using OpenIdConnectOptions which is used by ADB2C Authentication under the hood. We must do this without interfering any other configuration of ADB2C.
Here is my take:
// My (and probably everyone's) existing code in Startup:
services.AddAuthentication(AzureADB2CDefaults.AuthenticationScheme)
.AddAzureADB2C(options => Configuration.Bind("AzureAdB2C", options));
// This adds the custom event handler, without interfering any existing functionality:
services.Configure<OpenIdConnectOptions>(AzureADB2CDefaults.OpenIdScheme,
options =>
{
options.Events.OnTokenValidated =
new AzureADB2CHelper(options.Events.OnTokenValidated).OnTokenValidated;
});
All implementation is encapsulated in a helper class to keep Startup class clean. The original event handler is saved and called in case if it is not null (it is not btw)
public class AzureADB2CHelper
{
private readonly ActiveDirectoryClient _activeDirectoryClient;
private readonly Func<TokenValidatedContext, Task> _onTokenValidated;
private const string AadGraphUri = "https://graph.windows.net";
public AzureADB2CHelper(Func<TokenValidatedContext, Task> onTokenValidated)
{
_onTokenValidated = onTokenValidated;
_activeDirectoryClient = CreateActiveDirectoryClient();
}
private ActiveDirectoryClient CreateActiveDirectoryClient()
{
// TODO: Refactor secrets to settings
var authContext = new AuthenticationContext("https://login.microsoftonline.com/<yourdomain, like xxx.onmicrosoft.com>");
var clientCredential = new ClientCredential("<yourclientcredential>", #"<yourappsecret>");
var graphUri = new Uri(AadGraphUri);
var serviceRoot = new Uri(graphUri, "<yourdomain, like xxx.onmicrosoft.com>");
return new ActiveDirectoryClient(serviceRoot,
async () => await AcquireGraphAPIAccessToken(AadGraphUri, authContext, clientCredential));
}
private async Task<string> AcquireGraphAPIAccessToken(string graphAPIUrl,
AuthenticationContext authContext,
ClientCredential clientCredential)
{
AuthenticationResult result = null;
var retryCount = 0;
var retry = false;
do
{
retry = false;
try
{
// ADAL includes an in-memory cache, so this will only send a request if the cached token has expired
result = await authContext.AcquireTokenAsync(graphAPIUrl, clientCredential);
}
catch (AdalException ex)
{
if (ex.ErrorCode != "temporarily_unavailable")
{
continue;
}
retry = true;
retryCount++;
await Task.Delay(3000);
}
} while (retry && retryCount < 3);
return result?.AccessToken;
}
public Task OnTokenValidated(TokenValidatedContext context)
{
_onTokenValidated?.Invoke(context);
return Task.Run(async () =>
{
try
{
var oidClaim = context.SecurityToken.Claims.FirstOrDefault(c => c.Type == "oid");
if (!string.IsNullOrWhiteSpace(oidClaim?.Value))
{
var pagedCollection = await _activeDirectoryClient.Users.GetByObjectId(oidClaim.Value).MemberOf
.ExecuteAsync();
do
{
var directoryObjects = pagedCollection.CurrentPage.ToList();
foreach (var directoryObject in directoryObjects)
{
if (directoryObject is Group group)
{
((ClaimsIdentity) context.Principal.Identity).AddClaim(new Claim(ClaimTypes.Role,
group.DisplayName, ClaimValueTypes.String));
}
}
pagedCollection = pagedCollection.MorePagesAvailable
? await pagedCollection.GetNextPageAsync()
: null;
} while (pagedCollection != null);
}
}
catch (Exception e)
{
Debug.WriteLine(e);
}
});
}
}
You will need the appropriate packages I am using the following ones:
<PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="3.0.0" />
<PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="3.0.0" />
<PackageReference Include="Microsoft.Azure.ActiveDirectory.GraphClient" Version="2.1.1" />
<PackageReference Include="Microsoft.IdentityModel.Clients.ActiveDirectory" Version="5.2.3" />
Catch: You must give your application permission to read AD. As of Oct 2019 this application must be a 'legacy' app and not the newest B2C application. Here is a very good guide: Azure AD B2C: Use the Azure AD Graph API

There is an official sample: Azure AD B2C: Role-Based Access Control
available here from the Azure AD team.
But yes, the only solution seems to be a custom implementation by reading user groups with the help of MS Graph.

Based on all the amazing answers here, getting user groups using the new Microsoft Graph API
IConfidentialClientApplication confidentialClientApplication = ConfidentialClientApplicationBuilder
.Create("application-id")
.WithTenantId("tenant-id")
.WithClientSecret("xxxxxxxxx")
.Build();
ClientCredentialProvider authProvider = new ClientCredentialProvider(confidentialClientApplication);
GraphServiceClient graphClient = new GraphServiceClient(authProvider);
var groups = await graphClient.Users[oid].MemberOf.Request().GetAsync();

I really like the answer from #AlexLobakov but I wanted an updated answer for .NET 6 and also something that was testable but still implemented the caching features. I also wanted the roles to be sent to my front end, be compatible with any SPA like React and use standard Azure AD B2C User flows for Role-based access control (RBAC) in my application.
I also missed a start to finish guide, so many variables that can go wrong and you end up with an application not working.
Start with creating a new ASP.NET Core Web API in Visual Studio 2022 with the following settings:
You should get a dialogue like this after creation:
If you don't see this then right click on the project in Visual Studio and click on Overview and then Connected services.
Create a new App registration in your Azure AD B2C or use an existing. I registered a new one for this demo purpose.
After creating the App registration Visual Studio got stuck on Dependency configuration progress so the rest will be configured manually:
Log on to https://portal.azure.com/, Switch directory to your AD B2C, select your new App registration and then click on Authentication. Then click on Add a platform and select Web.
Add a Redirect URI and Front-channel logout URL for localhost.
Example:
https://localhost:7166/signin-oidc
https://localhost:7166/logout
If you choose Single-page application instead it will look nearly the same. However you then need to add a code_challenge as described below. A full example for this will not be shown.
Is Active Directory not supporting Authorization Code Flow with PKCE?
Authentication should look something like this:
Click on Certificates & secrets and create a new Client secret.
Click on Expose an API and then edit Application ID URI.
Default value should look something like this api://11111111-1111-1111-1111-111111111111. Edit it to be https://youradb2c.onmicrosoft.com/11111111-1111-1111-1111-111111111111. There should be a scope named access_as_user. Create if it is not there.
Now click on API permissions:
Four Microsoft Graph permissions are needed.
Two Application:
GroupMember.Read.All
User.Read.All
Two Delegated:
offline_access
openid
You also need your access_as_user permission from My APIs. When this is done click on Grant admin consent for .... Should look like this:
If you don't have a User Flow already then create either a Sign up and sign in or a Sign in and select Recommended. My user flow is default B2C_1_signin.
Verify that your AD B2C user is a member of the group you want to authenticate against:
Now you can go back to your application and verify that you can get a code to login. Use this sample and it should redirect with a code:
https://<tenant-name>.b2clogin.com/tfp/<tenant-name>.onmicrosoft.com/<user-flow-name>/oauth2/v2.0/authorize?
client_id=<application-ID>
&nonce=anyRandomValue
&redirect_uri=https://localhost:7166/signin-oidc
&scope=https://<tenant-name>.onmicrosoft.com/11111111-1111-1111-1111-111111111111/access_as_user
&response_type=code
If it works you should be redirected to something like this after login:
https://localhost:7166/signin-oidc?code=
If you get an error that says:
AADB2C99059: The supplied request must present a code_challenge
Then you have probably selected platform Single-page application and needs to add a code_challenge to the request like: &code_challenge=123. This is not enough because you also need to validate the challenge later otherwise you will get the error below when running my code.
AADB2C90183: The supplied code_verifier is invalid
Now open your application and appsettings.json. Default should look something like this:
"AzureAd": {
"Instance": "https://login.microsoftonline.com/",
"Domain": "qualified.domain.name",
"TenantId": "22222222-2222-2222-2222-222222222222",
"ClientId": "11111111-1111-1111-11111111111111111",
"Scopes": "access_as_user",
"CallbackPath": "/signin-oidc"
},
We need a few more values so it should look like this in the end:
"AzureAd": {
"Instance": "https://<tenant-name>.b2clogin.com/",
"Domain": "<tenant-name>.onmicrosoft.com",
"TenantId": "22222222-2222-2222-2222-222222222222",
"ClientId": "11111111-1111-1111-11111111111111111",
"SignUpSignInPolicyId": "B2C_1_signin",
"ClientSecret": "--SECRET--",
"ApiScope": "https://<tenant-name>.onmicrosoft.com/11111111-1111-1111-11111111111111111/access_as_user",
"TokenUrl": "https://<tenant-name>.b2clogin.com/<tenant-name>.onmicrosoft.com/B2C_1_signin/oauth2/v2.0/token",
"Scopes": "access_as_user",
"CallbackPath": "/signin-oidc"
},
I store ClientSecret in Secret Manager.
https://learn.microsoft.com/en-us/aspnet/core/security/app-secrets?view=aspnetcore-6.0&tabs=windows#manage-user-secrets-with-visual-studio
Now create these new classes:
AppSettings:
namespace AzureADB2CWebAPIGroupTest
{
public class AppSettings
{
public AzureAdSettings AzureAd { get; set; } = new AzureAdSettings();
}
public class AzureAdSettings
{
public string Instance { get; set; }
public string Domain { get; set; }
public string TenantId { get; set; }
public string ClientId { get; set; }
public string IssuerSigningKey { get; set; }
public string ValidIssuer { get; set; }
public string ClientSecret { get; set; }
public string ApiScope { get; set; }
public string TokenUrl { get; set; }
}
}
Adb2cTokenResponse:
namespace AzureADB2CWebAPIGroupTest
{
public class Adb2cTokenResponse
{
public string access_token { get; set; }
public string id_token { get; set; }
public string token_type { get; set; }
public int not_before { get; set; }
public int expires_in { get; set; }
public int ext_expires_in { get; set; }
public int expires_on { get; set; }
public string resource { get; set; }
public int id_token_expires_in { get; set; }
public string profile_info { get; set; }
public string scope { get; set; }
public string refresh_token { get; set; }
public int refresh_token_expires_in { get; set; }
}
}
CacheKeys:
namespace AzureADB2CWebAPIGroupTest
{
public static class CacheKeys
{
public const string GraphApiAccessToken = "_GraphApiAccessToken";
}
}
GraphApiService:
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Graph;
using System.Text.Json;
namespace AzureADB2CWebAPIGroupTest
{
public class GraphApiService
{
private readonly IHttpClientFactory _clientFactory;
private readonly IMemoryCache _memoryCache;
private readonly AppSettings _settings;
private readonly string _accessToken;
public GraphApiService(IHttpClientFactory clientFactory, IMemoryCache memoryCache, AppSettings settings)
{
_clientFactory = clientFactory;
_memoryCache = memoryCache;
_settings = settings;
string graphApiAccessTokenCacheEntry;
// Look for cache key.
if (!_memoryCache.TryGetValue(CacheKeys.GraphApiAccessToken, out graphApiAccessTokenCacheEntry))
{
// Key not in cache, so get data.
var adb2cTokenResponse = GetAccessTokenAsync().GetAwaiter().GetResult();
graphApiAccessTokenCacheEntry = adb2cTokenResponse.access_token;
// Set cache options.
var cacheEntryOptions = new MemoryCacheEntryOptions()
.SetAbsoluteExpiration(TimeSpan.FromSeconds(adb2cTokenResponse.expires_in));
// Save data in cache.
_memoryCache.Set(CacheKeys.GraphApiAccessToken, graphApiAccessTokenCacheEntry, cacheEntryOptions);
}
_accessToken = graphApiAccessTokenCacheEntry;
}
public async Task<List<string>> GetUserGroupsAsync(string oid)
{
var authProvider = new AuthenticationProvider(_accessToken);
GraphServiceClient graphClient = new GraphServiceClient(authProvider, new HttpClientHttpProvider(_clientFactory.CreateClient()));
//Requires GroupMember.Read.All and User.Read.All to get everything we want
var groups = await graphClient.Users[oid].MemberOf.Request().GetAsync();
if (groups == null)
{
return null;
}
var graphGroup = groups.Cast<Microsoft.Graph.Group>().ToList();
return graphGroup.Select(x => x.DisplayName).ToList();
}
private async Task<Adb2cTokenResponse> GetAccessTokenAsync()
{
var client = _clientFactory.CreateClient();
var kvpList = new List<KeyValuePair<string, string>>();
kvpList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
kvpList.Add(new KeyValuePair<string, string>("client_id", _settings.AzureAd.ClientId));
kvpList.Add(new KeyValuePair<string, string>("scope", "https://graph.microsoft.com/.default"));
kvpList.Add(new KeyValuePair<string, string>("client_secret", _settings.AzureAd.ClientSecret));
#pragma warning disable SecurityIntelliSenseCS // MS Security rules violation
var req = new HttpRequestMessage(HttpMethod.Post, $"https://login.microsoftonline.com/{_settings.AzureAd.Domain}/oauth2/v2.0/token")
{ Content = new FormUrlEncodedContent(kvpList) };
#pragma warning restore SecurityIntelliSenseCS // MS Security rules violation
using var httpResponse = await client.SendAsync(req);
var response = await httpResponse.Content.ReadAsStringAsync();
httpResponse.EnsureSuccessStatusCode();
var adb2cTokenResponse = JsonSerializer.Deserialize<Adb2cTokenResponse>(response);
return adb2cTokenResponse;
}
}
public class AuthenticationProvider : IAuthenticationProvider
{
private readonly string _accessToken;
public AuthenticationProvider(string accessToken)
{
_accessToken = accessToken;
}
public Task AuthenticateRequestAsync(HttpRequestMessage request)
{
request.Headers.Add("Authorization", $"Bearer {_accessToken}");
return Task.CompletedTask;
}
}
public class HttpClientHttpProvider : IHttpProvider
{
private readonly HttpClient http;
public HttpClientHttpProvider(HttpClient http)
{
this.http = http;
}
public ISerializer Serializer { get; } = new Serializer();
public TimeSpan OverallTimeout { get; set; } = TimeSpan.FromSeconds(300);
public void Dispose()
{
}
public Task<HttpResponseMessage> SendAsync(HttpRequestMessage request)
{
return http.SendAsync(request);
}
public Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
HttpCompletionOption completionOption,
CancellationToken cancellationToken)
{
return http.SendAsync(request, completionOption, cancellationToken);
}
}
}
At the moment only accessToken for GraphServiceClient is stored in memorycache but if the application requires better performance a users groups could also be cached.
Add a new class:
Adb2cUser:
namespace AzureADB2CWebAPIGroupTest
{
public class Adb2cUser
{
public Guid Id { get; set; }
public string GivenName { get; set; }
public string FamilyName { get; set; }
public string Email { get; set; }
public List<string> Roles { get; set; }
public Adb2cTokenResponse Adb2cTokenResponse { get; set; }
}
}
and struct:
namespace AzureADB2CWebAPIGroupTest
{
public struct ADB2CJwtRegisteredClaimNames
{
public const string Emails = "emails";
public const string Name = "name";
}
}
And now add a new API Controller
LoginController:
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using System.IdentityModel.Tokens.Jwt;
using System.Text.Json;
namespace AzureADB2CWebAPIGroupTest.Controllers
{
[Route("api/[controller]")]
[ApiController]
[Authorize]
public class LoginController : ControllerBase
{
private readonly ILogger<LoginController> _logger;
private readonly IHttpClientFactory _clientFactory;
private readonly AppSettings _settings;
private readonly GraphApiService _graphApiService;
public LoginController(ILogger<LoginController> logger, IHttpClientFactory clientFactory, AppSettings settings, GraphApiService graphApiService)
{
_logger = logger;
_clientFactory = clientFactory;
_settings = settings;
_graphApiService=graphApiService;
}
[HttpPost]
[AllowAnonymous]
public async Task<ActionResult<Adb2cUser>> Post([FromBody] string code)
{
var redirectUri = "";
if (HttpContext != null)
{
redirectUri = HttpContext.Request.Scheme + "://" + HttpContext.Request.Host + "/signin-oidc";
}
var kvpList = new List<KeyValuePair<string, string>>();
kvpList.Add(new KeyValuePair<string, string>("grant_type", "authorization_code"));
kvpList.Add(new KeyValuePair<string, string>("client_id", _settings.AzureAd.ClientId));
kvpList.Add(new KeyValuePair<string, string>("scope", "openid offline_access " + _settings.AzureAd.ApiScope));
kvpList.Add(new KeyValuePair<string, string>("code", code));
kvpList.Add(new KeyValuePair<string, string>("redirect_uri", redirectUri));
kvpList.Add(new KeyValuePair<string, string>("client_secret", _settings.AzureAd.ClientSecret));
return await UserLoginAndRefresh(kvpList);
}
[HttpPost("refresh")]
[AllowAnonymous]
public async Task<ActionResult<Adb2cUser>> Refresh([FromBody] string token)
{
var redirectUri = "";
if (HttpContext != null)
{
redirectUri = HttpContext.Request.Scheme + "://" + HttpContext.Request.Host;
}
var kvpList = new List<KeyValuePair<string, string>>();
kvpList.Add(new KeyValuePair<string, string>("grant_type", "refresh_token"));
kvpList.Add(new KeyValuePair<string, string>("client_id", _settings.AzureAd.ClientId));
kvpList.Add(new KeyValuePair<string, string>("scope", "openid offline_access " + _settings.AzureAd.ApiScope));
kvpList.Add(new KeyValuePair<string, string>("refresh_token", token));
kvpList.Add(new KeyValuePair<string, string>("redirect_uri", redirectUri));
kvpList.Add(new KeyValuePair<string, string>("client_secret", _settings.AzureAd.ClientSecret));
return await UserLoginAndRefresh(kvpList);
}
private async Task<ActionResult<Adb2cUser>> UserLoginAndRefresh(List<KeyValuePair<string, string>> kvpList)
{
var user = await TokenRequest(kvpList);
if (user == null)
{
return Unauthorized();
}
//Return access token and user information
return Ok(user);
}
private async Task<Adb2cUser> TokenRequest(List<KeyValuePair<string, string>> keyValuePairs)
{
var client = _clientFactory.CreateClient();
#pragma warning disable SecurityIntelliSenseCS // MS Security rules violation
var req = new HttpRequestMessage(HttpMethod.Post, _settings.AzureAd.TokenUrl)
{ Content = new FormUrlEncodedContent(keyValuePairs) };
#pragma warning restore SecurityIntelliSenseCS // MS Security rules violation
using var httpResponse = await client.SendAsync(req);
var response = await httpResponse.Content.ReadAsStringAsync();
httpResponse.EnsureSuccessStatusCode();
var adb2cTokenResponse = JsonSerializer.Deserialize<Adb2cTokenResponse>(response);
var handler = new JwtSecurityTokenHandler();
var jwtSecurityToken = handler.ReadJwtToken(adb2cTokenResponse.access_token);
var id = jwtSecurityToken.Claims.First(claim => claim.Type == JwtRegisteredClaimNames.Sub).Value;
var groups = await _graphApiService.GetUserGroupsAsync(id);
var givenName = jwtSecurityToken.Claims.First(claim => claim.Type == JwtRegisteredClaimNames.GivenName).Value;
var familyName = jwtSecurityToken.Claims.First(claim => claim.Type == JwtRegisteredClaimNames.FamilyName).Value;
//Unless Alternate email have been added in Azure AD there will only be one email here.
//TODO Handle multiple emails
var emails = jwtSecurityToken.Claims.First(claim => claim.Type == ADB2CJwtRegisteredClaimNames.Emails).Value;
var user = new Adb2cUser()
{
Id = Guid.Parse(id),
GivenName = givenName,
FamilyName = familyName,
Email = emails,
Roles = groups,
Adb2cTokenResponse = adb2cTokenResponse
};
return user;
}
}
}
Now it is time to edit Program.cs. Should look something like this for the new minimal hosting model in ASP.NET Core 6.0:
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddMicrosoftIdentityWebApi(builder.Configuration.GetSection("AzureAd"));
Notice that ASP.NET Core 6.0 are using JwtBearerDefaults.AuthenticationScheme and not AzureADB2CDefaults.AuthenticationScheme or AzureADB2CDefaults.OpenIdScheme.
Edit so Program.cs looks like this:
using AzureADB2CWebAPIGroupTest;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Identity.Web;
using System.Security.Claims;
var builder = WebApplication.CreateBuilder(args);
//Used for debugging
//IdentityModelEventSource.ShowPII = true;
var settings = new AppSettings();
builder.Configuration.Bind(settings);
builder.Services.AddSingleton(settings);
var services = new ServiceCollection();
services.AddMemoryCache();
services.AddHttpClient();
var serviceProvider = services.BuildServiceProvider();
var memoryCache = serviceProvider.GetService<IMemoryCache>();
var httpClientFactory = serviceProvider.GetService<IHttpClientFactory>();
var graphApiService = new GraphApiService(httpClientFactory, memoryCache, settings);
// Add services to the container.
builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddMicrosoftIdentityWebApi(options => {
builder.Configuration.Bind("AzureAd", options);
options.TokenValidationParameters.NameClaimType = "name";
options.TokenValidationParameters.ValidateIssuerSigningKey = true;
options.TokenValidationParameters.ValidateLifetime = true;
options.TokenValidationParameters.ValidateIssuer = true;
options.TokenValidationParameters.ValidateLifetime = true;
options.TokenValidationParameters.ValidateTokenReplay = true;
options.Audience = settings.AzureAd.ClientId;
options.Events = new JwtBearerEvents()
{
OnTokenValidated = async ctx =>
{
//Runs on every request, cache a users groups if needed
var oidClaim = ((System.IdentityModel.Tokens.Jwt.JwtSecurityToken)ctx.SecurityToken).Claims.FirstOrDefault(c => c.Type == "oid");
if (!string.IsNullOrWhiteSpace(oidClaim?.Value))
{
var groups = await graphApiService.GetUserGroupsAsync(oidClaim.Value);
foreach (var group in groups)
{
((ClaimsIdentity)ctx.Principal.Identity).AddClaim(new Claim(ClaimTypes.Role.ToString(), group));
}
}
}
};
},
options => {
builder.Configuration.Bind("AzureAd", options);
});
builder.Services.AddTransient<GraphApiService>();
builder.Services.AddHttpClient();
builder.Services.AddMemoryCache();
builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();
app.Run();
Now you can run your application and use the code from earlier in a request like this:
POST /api/login/ HTTP/1.1
Host: localhost:7166
Content-Type: application/json
"code"
You will then receieve a response like this with an access_token:
{
"id": "31111111-1111-1111-1111-111111111111",
"givenName": "Oscar",
"familyName": "Andersson",
"email": "oscar.andersson#example.com",
"roles": [
"Administrator",
],
"adb2cTokenResponse": {
}
}
Adding [Authorize(Roles = "Administrator")] to WeatherForecastController.cs we can now verify that only a user with the correct role is allowed to access this resource using the access_token we got earlier:
If we change to [Authorize(Roles = "Administrator2")] we get a HTTP 403 with the same user:
LoginController can handle refresh tokens as well.
With NuGets Microsoft.NET.Test.Sdk, xunit, xunit.runner.visualstudio and Moq we can also test LoginController and in turn also GraphApiService used for ClaimsIdentity in Program.cs. Unfortunately due body being limited to 30000 charcters the entire test can not be shown.
It basically looks like this:
LoginControllerTest:
using AzureADB2CWebAPIGroupTest.Controllers;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Caching.Memory;
using Moq;
using Moq.Protected;
using System.Net;
using Xunit;
namespace AzureADB2CWebAPIGroupTest
{
public class LoginControllerTest
{
[Theory]
[MemberData(nameof(PostData))]
public async Task Post(string code, string response, string expectedEmail, string expectedFamilyName, string expectedGivenName)
{
var controller = GetLoginController(response);
var result = await controller.Post(code);
var actionResult = Assert.IsType<ActionResult<Adb2cUser>>(result);
var okResult = Assert.IsType<OkObjectResult>(result.Result);
var returnValue = Assert.IsType<Adb2cUser>(okResult.Value);
Assert.Equal(returnValue.Email, expectedEmail);
Assert.Equal(returnValue.Roles[1], GraphApiServiceMock.DummyGroup2Name);
}
[Theory]
[MemberData(nameof(RefreshData))]
public async Task Refresh(string code, string response, string expectedEmail, string expectedFamilyName, string expectedGivenName)
{
var controller = GetLoginController(response);
var result = await controller.Refresh(code);
var actionResult = Assert.IsType<ActionResult<Adb2cUser>>(result);
var okResult = Assert.IsType<OkObjectResult>(result.Result);
var returnValue = Assert.IsType<Adb2cUser>(okResult.Value);
Assert.Equal(returnValue.Email, expectedEmail);
Assert.Equal(returnValue.Roles[1], GraphApiServiceMock.DummyGroup2Name);
}
//PostData and RefreshData removed for space
private LoginController GetLoginController(string expectedResponse)
{
var mockFactory = new Mock<IHttpClientFactory>();
var settings = new AppSettings();
settings.AzureAd.TokenUrl = "https://example.com";
var mockMessageHandler = new Mock<HttpMessageHandler>();
GraphApiServiceMock.MockHttpRequests(mockMessageHandler);
mockMessageHandler.Protected()
.Setup<Task<HttpResponseMessage>>("SendAsync", ItExpr.Is<HttpRequestMessage>(x => x.RequestUri.AbsoluteUri.Contains(settings.AzureAd.TokenUrl)), ItExpr.IsAny<CancellationToken>())
.ReturnsAsync(new HttpResponseMessage
{
StatusCode = HttpStatusCode.OK,
Content = new StringContent(expectedResponse)
});
var httpClient = new HttpClient(mockMessageHandler.Object);
mockFactory.Setup(_ => _.CreateClient(It.IsAny<string>())).Returns(httpClient);
var logger = Mock.Of<ILogger<LoginController>>();
var services = new ServiceCollection();
services.AddMemoryCache();
var serviceProvider = services.BuildServiceProvider();
var memoryCache = serviceProvider.GetService<IMemoryCache>();
var graphService = new GraphApiService(mockFactory.Object, memoryCache, settings);
var controller = new LoginController(logger, mockFactory.Object, settings, graphService);
return controller;
}
}
}
A GraphApiServiceMock.cs is also needed but it just adds more values like the example with mockMessageHandler.Protected() and static values like public static string DummyUserExternalId = "11111111-1111-1111-1111-111111111111";.
There are other ways to do this but they usually depend on Custom Policies:
https://learn.microsoft.com/en-us/answers/questions/469509/can-we-get-and-edit-azure-ad-b2c-roles-using-ad-b2.html
https://devblogs.microsoft.com/premier-developer/using-groups-in-azure-ad-b2c/
https://learn.microsoft.com/en-us/azure/active-directory-b2c/user-flow-overview

First of all, thank you all for the previous responses. I've spent the entire day to put this to work. I'm using ASPNET Core 3.1 and I was getting the following error when using the solution from previous response:
secure binary serialization is not supported on this platform
I've replaces to REST API queries and I was able to get the groups:
public Task OnTokenValidated(TokenValidatedContext context)
{
_onTokenValidated?.Invoke(context);
return Task.Run(async () =>
{
try
{
var oidClaim = context.SecurityToken.Claims.FirstOrDefault(c => c.Type == "oid");
if (!string.IsNullOrWhiteSpace(oidClaim?.Value))
{
HttpClient http = new HttpClient();
var domainName = _azureADSettings.Domain;
var authContext = new AuthenticationContext($"https://login.microsoftonline.com/{domainName}");
var clientCredential = new ClientCredential(_azureADSettings.ApplicationClientId, _azureADSettings.ApplicationSecret);
var accessToken = AcquireGraphAPIAccessToken(AadGraphUri, authContext, clientCredential).Result;
var url = $"https://graph.windows.net/{domainName}/users/" + oidClaim?.Value + "/$links/memberOf?api-version=1.6";
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url);
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
HttpResponseMessage response = await http.SendAsync(request);
dynamic json = JsonConvert.DeserializeObject<dynamic>(await response.Content.ReadAsStringAsync());
foreach(var group in json.value)
{
dynamic x = group.url.ToString();
request = new HttpRequestMessage(HttpMethod.Get, x + "?api-version=1.6");
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
response = await http.SendAsync(request);
dynamic json2 = JsonConvert.DeserializeObject<dynamic>(await response.Content.ReadAsStringAsync());
((ClaimsIdentity)((ClaimsIdentity)context.Principal.Identity)).AddClaim(new Claim(ClaimTypes.Role.ToString(), json2.displayName.ToString()));
}
}
}
catch (Exception e)
{
Debug.WriteLine(e);
}
});
}