Antiforgery token is not being generated

Marcin van de Ven 10

I'm using Blazor (Interactive Server) to create a web application. Before I went on holiday I used the general template available in Visual Studio 2022, including the authentication & authorization options, as an example for creating the application.

Now that I'm back I need to start continuing this project. However, handling forms do not work anymore, giving me A valid antiforgery token was not provided with the request. Add an antiforgery token, or disable antiforgery validation for this endpoint. when submitting the login form.

Bypassing this check by adding DisableAntiforgery() to the app.MapRazorComponents<App>() in program.cs did work to login. I enabled antiforgery again and found out that all forms do not work anymore, such as the registration form and the logout-redirect (which is using a post-method, copied from the template).

Diving into the generated HTML of the forms, I saw that the hidden input form field _requestVerificationToken is not generated, despite including <AntiforgeryToken /> in the blazor code form for the logout-button. The same is happening in the <EditForm>-forms, also there no token is being generated for the HTML.

The only solutions I have found is disabling the antiforgery (which I did to bypass), but this could become a security risk. Deleting app.UseAntiforgery() is not possible, as then Authentication and Authorization do not work anymore. Other suggestions include the location of app.UseAntiforgery() in the program.cs file, which I already placed after app.UseAuthentication() and app.UseAuthorization().

I really cannot find any reason why this is not working anymore: I had no problems with the antiforgery tokens a couple of weeks ago. Removing the global authorization requirement or disabling the <AuthorizeView> elements also do nothing.

I also tried reverting back to an earlier state where Authentication and Authorization were not used, to test again. This also did not work, as it is too integrated once enabled.

AgaveJoe 28,536 Reputation points

2024-07-29T18:33:03.43+00:00

I would create an new Interactive Server project with Identity. Verify the anti-forgery token is functioning as expected. Then compare the template code with your project code.
Ping Ni-MSFT 4,720 Reputation points Microsoft Vendor

2024-07-30T07:31:54.45+00:00

Hi @Marcin van de Ven, please share your Program.cs code. Do all the component form submit not working with this error message? Could you please how do you design the component? Also, be sure add app.UseAntiforgery() between calls to app.UseAuthorization() and app.MapRazorComponents() in program.cs.

Marcin van de Ven 10

Program.cs:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    { //TODO: Change requirements before going live
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

As stated, I've used the authorization template and used the login/registration/logout functionality. I've used @attribute [Authorize] in the _imports.cs file to redirect to a login page when a user is not logged in, and used @attribute [AllowAnonymous] on this login page to have users log in. When removing those attributes, the AntiforgeryToken still is not generated on the HTML as a hidden input. I'm using the same Routes.cs file as in the template project. I only renamed the MainLayout name.

Removing the <AuthorizeView>, <Authorized> and <NotAuthorized> tags from all HTML that should only be visible when a user is logged in, does not work either. I correctly get the login page displayed (Routes.razor), but this form/page is still not having a AntiforgeryToken generated.

For testing: I have created a new form that is not linked to any authorizations. Both on regular HTML-form including a <AntiforgeryToken>-tag, and on an <EditForm>-type form, no AntiforgeryToken is being generated in the HTML. However, when submitting, it still gives the same error message on both form types.

I did try to disable Antiforgery (https://stackoverflow.com/questions/78221910/how-to-disable-anti-forgery-cookie-for-net-8-web-app), which did work for logging in and processing the test forms. But this does not work for logging out the user, as the logout handled requires the token. Instead of giving an error, it gives an AntiforgeryValidationException: The required antiforgery request token was not provided in either form field "__RequestVerificationToken" or header value "RequestVerificationToken" exception. Which is expected, since no tokens for antiforgery/validation are generated in the HTML-forms.

Marcin van de Ven 10

Here is my program.cs file:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

I'm using a global @attribute [Authorize] in the _imports.razor file to require users to log in before accessing the application. The login page has the @attribute [AllowAnonymous] to make the login page work. Removing this did not fix the problem.

I then have tried removing all authorizations from the components, by removing the <AuthorizeView>, <Authorized> and <NotAuthorized>-tags from all components requiring user login. This resulted in a correct display of the login-page, that got redirected by the Routes.razor, which is a literal copy from the Blazor Authorization Template provided by Visual Studio 2022. There also no AntiforgeryToken was generated.

I then tried to Disable Antiforgery from the project (see https://stackoverflow.com/questions/78221910/how-to-disable-anti-forgery-cookie-for-net-8-web-app). This did work for logging in and registering a new user, but not for logging out the user, as I then get an AntiforgeryValidationException stating that no valid token is provided. Which is of course expected, since Blazor is not generating any in the code.

I also have created both a regular HTML-form and an <EditForm> which did not require any authorizations. For the HTML I included an <AntiforgeryToken /> tag. Unfortunately, on both forms no token is being produced for the HTML, and giving again the same error on submission when I want to process the input. Disabling Antiforgery does make the processing for the <EditForm>.

Of course I can try to disable Antiforgery entirely from the project, but I expect I will keep running into issues with the IdentityProvider, as shown by the exception during logout. Furthermore I expect that this might impose a security risk in a later stage, especially because this application will include an indirect remote remote control feature for industrial machinery, and Authenticating and Authorizing users safely is very important.

Marcin van de Ven 10

Here is my program.cs file:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

Marcin van de Ven 10

Here is my program.cs file:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

Marcin van de Ven 10

Here is my program.cs file:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

I then tried to Disable Antiforgery from the project. This did work for logging in and registering a new user, but not for logging out the user, as I then get an AntiforgeryValidationException stating that no valid token is provided. Which is of course expected, since Blazor is not generating any in the code.

Marcin van de Ven 10

Here is my program.cs file:

var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddServerSideBlazor();
builder.Services.AddHttpClient();
builder.Services.AddRazorComponents()
    .AddInteractiveServerComponents();
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddScoped<IdentityUserAccessor>();
builder.Services.AddScoped<IdentityRedirectManager>();
builder.Services.AddScoped<AuthenticationStateProvider, RevalidatingIdentityAuthenticationStateProvider<ApplicationUser>>();
builder.Services.AddAuthentication(options =>
    {
        options.DefaultScheme = IdentityConstants.ApplicationScheme;
        options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
    }).AddIdentityCookies();
var authDatabaseConnectionString = builder.Configuration.GetConnectionString("AuthDatabase");
builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseMySql(authDatabaseConnectionString, ServerVersion.AutoDetect(authDatabaseConnectionString)));
builder.Services.AddIdentityCore<ApplicationUser>(options =>
    {
        options.SignIn.RequireConfirmedAccount = false;
        options.Password.RequiredLength = 1;
        options.Password.RequireDigit = false;
        options.Password.RequireLowercase = false;
        options.Password.RequireUppercase = false;
        options.Password.RequireNonAlphanumeric = false;
    })
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();
builder.Services.AddLocalization();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error", createScopeForErrors: true);
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

Marcin van de Ven 10 Reputation points

2024-07-30T10:17:52.11+00:00

For some reason this site is not letting me post my program.cs-file?

To clearify:

I'm using a global @attribute [Authorize] in the _imports.razor file to require users to log in before accessing the application. The login page has the @attribute [AllowAnonymous] to make the login page work. Removing this did not fix the problem.

I then have tried removing all authorizations from the components, by removing the <AuthorizeView>, <Authorized> and <NotAuthorized>-tags from all components requiring user login. This resulted in a correct display of the login-page, that got redirected by the Routes.razor, which is a literal copy from the Blazor Authorization Template provided by Visual Studio 2022. There also no AntiforgeryToken was generated.

I then tried to Disable Antiforgery from the project (see https://stackoverflow.com/questions/78221910/how-to-disable-anti-forgery-cookie-for-net-8-web-app). This did work for logging in and registering a new user, but not for logging out the user, as I then get an AntiforgeryValidationException stating that no valid token is provided. Which is of course expected, since Blazor is not generating any in the code.

I also have created both a regular HTML-form and an <EditForm> which did not require any authorizations. For the HTML I included an <AntiforgeryToken /> tag. Unfortunately, on both forms no token is being produced for the HTML, and giving again the same error on submission when I want to process the input. Disabling Antiforgery does make the processing for the <EditForm>.

Of course I can try to disable Antiforgery entirely from the project, but I expect I will keep running into issues with the IdentityProvider, as shown by the exception during logout. Furthermore I expect that this might impose a security risk in a later stage, especially because this application will include an indirect remote remote control feature for industrial machinery, and Authenticating and Authorizing users safely is very important.
Marcin van de Ven 10 Reputation points

2024-07-30T10:18:50.0466667+00:00

I'm using a global @attribute [Authorize] in the _imports.razor file to require users to log in before accessing the application. The login page has the @attribute [AllowAnonymous] to make the login page work. Removing this did not fix the problem.

I then have tried removing all authorizations from the components, by removing the <AuthorizeView>, <Authorized> and <NotAuthorized>-tags from all components requiring user login. This resulted in a correct display of the login-page, that got redirected by the Routes.razor, which is a literal copy from the Blazor Authorization Template provided by Visual Studio 2022. There also no AntiforgeryToken was generated.

I then tried to Disable Antiforgery from the project (see https://stackoverflow.com/questions/78221910/how-to-disable-anti-forgery-cookie-for-net-8-web-app). This did work for logging in and registering a new user, but not for logging out the user, as I then get an AntiforgeryValidationException stating that no valid token is provided. Which is of course expected, since Blazor is not generating any in the code.

I also have created both a regular HTML-form and an <EditForm> which did not require any authorizations. For the HTML I included an <AntiforgeryToken /> tag. Unfortunately, on both forms no token is being produced for the HTML, and giving again the same error on submission when I want to process the input. Disabling Antiforgery does make the processing for the <EditForm>.

Of course I can try to disable Antiforgery entirely from the project, but I expect I will keep running into issues with the IdentityProvider, as shown by the exception during logout. Furthermore I expect that this might impose a security risk in a later stage, especially because this application will include an indirect remote remote control feature for industrial machinery, and Authenticating and Authorizing users safely is very important.

Marcin van de Ven 10

The middleware-part of the program.cs-file

app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseAuthentication();
app.UseAuthorization();
app.UseAntiforgery();
var supportedCultures = new[] { "en", "nl" };
var localizationOptions = new RequestLocalizationOptions()
    .SetDefaultCulture(supportedCultures[0])
    .AddSupportedCultures(supportedCultures)
    .AddSupportedUICultures(supportedCultures);
app.UseRequestLocalization(localizationOptions);
app.MapRazorComponents<App>()
    .AddInteractiveServerRenderMode();
app.MapAdditionalIdentityEndpoints();
app.Run();

Ping Ni-MSFT 4,720 Reputation points Microsoft Vendor

2024-08-01T02:07:12.7+00:00

Hi @Marcin van de Ven, maybe it is better for you to share the minimal repo which could reproduce your issue.

2 answers

Marcin van de Ven 10 Reputation points

2024-07-31T09:01:31.0733333+00:00

Problem is solved. Apparently sometime (before my holiday break) the builder.Services.AddServerSideBlazor() was added to Program.cs. This broke the Antiforgery generation.
Please sign in to rate this answer.

1 person found this answer helpful.

0 comments No comments
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.
Amanulla Asfak Ahamed 155 Reputation points

2024-07-29T13:54:03.7333333+00:00
Check Startup.cs Configuration: Ensure that your middleware configuration in Startup.cs (or Program.cs in .NET 6 onwards) is correct. The order of middleware is crucial. UseAuthentication(), UseAuthorization(), and UseAntiforgery() should be properly configured. Typically, UseRouting(), UseAuthentication(), and UseAuthorization() need to be called in this order before UseEndpoints().
app.UseRouting(); app.UseAuthentication(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapRazorPages(); endpoints.MapBlazorHub(); endpoints.MapFallbackToPage("/_Host"); });

Ensure Antiforgery Token Initialization: In Blazor Server, you might not see a direct way to work with antiforgery tokens like you would in an MVC or Razor Pages application. However, ensure that any Razor page handling form submissions initializes the antiforgery token. If you are using Razor pages for the forms, you can manually add @Html.AntiForgeryToken() in your form.

Verify Blazor Server Configuration: Since Blazor Server works differently compared to traditional web apps, check if there are any specific settings or configurations altered that might affect token generation. Make sure that the <AntiforgeryToken /> component you're using is correctly implemented or referenced, as this is not a standard Blazor component.

Investigate External Changes: Since you mentioned that the issue arose after a break, check if there have been updates to the Blazor framework, libraries, or the browser that could affect how sessions and tokens are handled. Sometimes, browser updates can affect how cookies and headers are managed.

Logging and Debugging: Add extensive logging around the point where the form is submitted and where you expect the token to be validated. This might give you more insight into what is going wrong. You can use tools like Fiddler or Chrome Developer Tools to inspect the requests being sent and ensure that tokens are being transmitted correctly.

Test in Different Environments: If possible, test the application in a different environment or machine to see if the issue persists. This can help isolate the problem to environment-specific configurations or setups.

Review Changes: Review any code changes made before the issue appeared. If you're using version control like Git, consider checking out a previous commit where the feature was known to work and compare the current state.

Community and Support: If the issue persists, consider reaching out to the community through forums like Stack Overflow or the official Blazor GitHub repository. There might be others who have faced similar issues or updates in the framework that addressed such problems.

By following these steps, you should be able to diagnose why the antiforgery token is not being generated and apply a suitable fix.
Please sign in to rate this answer.
Amanulla Asfak Ahamed 155 Reputation points

2024-07-29T13:54:27.3266667+00:00

Check Startup.cs Configuration: Ensure that your middleware configuration in Startup.cs (or Program.cs in .NET 6 onwards) is correct. The order of middleware is crucial. UseAuthentication(), UseAuthorization(), and UseAntiforgery() should be properly configured. Typically, UseRouting(), UseAuthentication(), and UseAuthorization() need to be called in this order before UseEndpoints().
app.UseRouting(); app.UseAuthentication(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapRazorPages(); endpoints.MapBlazorHub(); endpoints.MapFallbackToPage("/_Host"); });

Ensure Antiforgery Token Initialization: In Blazor Server, you might not see a direct way to work with antiforgery tokens like you would in an MVC or Razor Pages application. However, ensure that any Razor page handling form submissions initializes the antiforgery token. If you are using Razor pages for the forms, you can manually add @Html.AntiForgeryToken() in your form.

Verify Blazor Server Configuration: Since Blazor Server works differently compared to traditional web apps, check if there are any specific settings or configurations altered that might affect token generation. Make sure that the <AntiforgeryToken /> component you're using is correctly implemented or referenced, as this is not a standard Blazor component.

Investigate External Changes: Since you mentioned that the issue arose after a break, check if there have been updates to the Blazor framework, libraries, or the browser that could affect how sessions and tokens are handled. Sometimes, browser updates can affect how cookies and headers are managed.

Logging and Debugging: Add extensive logging around the point where the form is submitted and where you expect the token to be validated. This might give you more insight into what is going wrong. You can use tools like Fiddler or Chrome Developer Tools to inspect the requests being sent and ensure that tokens are being transmitted correctly.

Test in Different Environments: If possible, test the application in a different environment or machine to see if the issue persists. This can help isolate the problem to environment-specific configurations or setups.

Review Changes: Review any code changes made before the issue appeared. If you're using version control like Git, consider checking out a previous commit where the feature was known to work and compare the current state.

Community and Support: If the issue persists, consider reaching out to the community through forums like Stack Overflow or the official Blazor GitHub repository. There might be others who have faced similar issues or updates in the framework that addressed such problems.

By following these steps, you should be able to diagnose why the antiforgery token is not being generated and apply a suitable fix.

Marcin van de Ven 10 Reputation points

2024-07-29T14:29:41.9+00:00

The current list of middleware in program.cs should be in the correct order (https, StaticFiles, Authentication, Authorization, AntiForgery, Localization, MapRazorComponents, IdentityEndpoints).

I cannot use @html.AntiForgeryToken in the code, as the @html-directive does not exist (anymore) in .NET 8.x

<AntiforgeryToken /> is used in the template, as I mentioned. The EditForm component should render this automatically, but also does not in my application. See https://learn.microsoft.com/en-us/aspnet/core/blazor/security/?view=aspnetcore-8.0&source=recommendations for details.

I did try to search for any updates or changes, but I cannot find a release-page on the Github-project, and also not on the Blazor-website. I only found the blog, but that does not mention any small updates, or old new articles mentioning the release of .NET 8.

I used the developer tools to see what caused the issue of the error, which is mentioned in the title of this post: AntiforgeryToken is not being generated. The error that I mentioned is displayed that it is not the validation that is failing, it is the fact that the token is not generated in the form.

It would be very strange if this is the case, but I'll try to deploy the code (and build) to check if it will then generated the token.

You might missed it because I updated it just minutes before your reply, but I tried reverting back to before implementing Authentication and Authorization. This was almost impossible to do as those authorization-code seems to be integrated everywhere now in the application. I did try to revert back to some other commits, but that did not help.

That's why I created a post in the forums here. StackOverflow already has a similar issue mentioned, but that links to a Github-issue that is marked as closed as a bug got fixed. But here we are, if it is a bug it is not fixed.
Sign in to comment

Use comments to ask for clarification, additional information, or improvements to the question.

Share via

Antiforgery token is not being generated

2 answers

Your answer