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External login providers

Umbraco supports supports external login providers (OAuth) for performing authentication of your users and members.

Both the Umbraco backoffice users and website members support external login providers (OAuth) for performing authentication. This could be any OpenIDConnect provider such as Entra ID/Azure Active Directory, Identity Server, Google, or Facebook.

Unlike previous major releases of Umbraco the use of the Identity Extensions package is no longer required.

Install an appropriate Nuget package for the provider you wish to use. Some popular ones found in Nuget include:

Try it out

Add Microsoft Entra ID authentication (Members)Add Google Authentication (Users)
Umbraco OpenIdConnect Example [Community-made]

This community-created package with a complete Umbraco solution incl. an SQLite database demonstrates how OpenID Connect can be used: Umbraco OpenIdConnect Example.

It is great for testing and for trying out the implementation before building it into your own project.

This project is not managed or maintained by Umbraco HQ.

Umbraco Entra ID (Azure AD) Example [Community-made]

This community-created package will allow you to automatically create Umbraco user accounts for users in your directory. This will then associate the Umbraco users with groups based on their AD group: Umbraco.Community.AzureSSO.

This project is not managed or maintained by Umbraco HQ.

Extend core functionality

When you are implementing your own custom authentication on Users and/or Members on your Umbraco CMS website, you are effectively extending existing features.

The process requires adding a couple of new classes (.cs files) to your Umbraco project:

To register these two classes in Umbraco CMS you need to add them to the Program.cs file.

It is also possible to register the configuration class directly into the extension class. See examples of how this is done in the generic examples for the static extension class.

Auto-linking

Traditionally, a backoffice User or frontend Member will need to exist in Umbraco first. Once they exist there, they can link their user account to an external login provider.

In many cases, however, the external login provider you install will be the source of truth for all of your users and members.

In this case, you will want to provide a Single Sign On (SSO) approach to logging in. This would enable the creating of user accounts on the external login provider and then automatically give them access to Umbraco. This is called auto-Linking.

Local logins

When have auto-linking configured, then any auto-linked user or member will have an empty password assigned. This means that they will not be able to log in locally (via username and password). In order to log in locally, they will have to assign a password to their account in the backoffice or the edit profile page.

For users specifically, if the DenyLocalLogin option is enabled, all password-changing functionality in the backoffice is disabled and local login is not possible.

Transferring Claims from External identities

In some cases, you may want to flow a Claim returned in your external login provider to the Umbraco backoffice identity's Claims. This could be the authentication cookie. Flowing Claims between the two can be done during the OnAutoLinking and OnExternalLogin.

The reason for wanted to flow a Claim could be to store the external login provider user ID into the backoffice identity cookie. It can then be retrieved on each request to look up data in another system needing the current user ID from the external login provider.

Do not flow large amounts of data into the backoffice identity. This information is stored in the backoffice authentication cookie and cookie limits will apply. Data like Json Web Tokens (JWT) needs to be persisted somewhere to be looked up and not stored within the backoffice identity itself.

Example

This is a simplistic example of brevity including no null checks, etc.

OnAutoLinking = (user, loginInfo) => {
    // You can customize the user before it's linked.
    // i.e. Modify the user's groups based on the Claims returned
    // in the externalLogin info
    var extClaim = externalLogin
        .Principal
        .FindFirst("MyClaim");
    user.Claims.Add(new IdentityUserClaim<string>
    {
        ClaimType = extClaim.Type,
        ClaimValue = extClaim.Value,
        UserId = user.Id
    });
},
OnExternalLogin = (user, loginInfo) => {
    // You can customize the user before it's saved whenever they have
    // logged in with the external provider.
    // i.e. Sync the user's name based on the Claims returned
    // in the externalLogin info
    var extClaim = externalLogin
        .Principal
        .FindFirst("MyClaim");
    user.Claims.Add(new IdentityUserClaim<string>
    {
        ClaimType = extClaim.Type,
        ClaimValue = extClaim.Value,
        UserId = user.Id
    });
    return true;
}

Storing external login provider data

In some cases, you may need to persist data from your external login provider like Access Tokens, etc.

You can persist this data to the affiliated user's external login data via the IExternalLoginWithKeyService. The void Save(Guid userOrMemberKey,IEnumerable<IExternalLoginToken> tokens) overload takes a new model of type IEnumerable<IExternalLogin>.

IExternalLogin contains a property called UserData. This is a blob text column which can store any arbitrary data for the external login provider.

Be aware that the local Umbraco user must already exist and be linked to the external login provider before data can be stored here. In cases where auto-linking occurs and the user isn't yet created, you need to store the data in memory first during auto-linking. Then you can persist the data to the service once the user is linked and created.

Auto-linking on backoffice authentication

For some providers, it does not make sense to use auto-linking. This is especially true for public providers such as Google or Facebook.

In those cases, it would mean that anyone who has a Google or Facebook account can log into your site.

If auto-linking for public providers such as these was needed you would need to limit the access. This can be done by domain or other information provided in the claims using the options/callbacks specified in those provider's authentication options.

Auto-linking on Member authentication

Auto-linking on Member authentication only makes sense if you have a public member registration already or the provider does not have public account creation.

Generic examples

The following section presents a series of generic examples.

"Provider" is used to replace place of the names of actual external login providers. When you implement your own custom authentication, you will need to use the correct method names for the chosen provider.

Custom-named configuration

The configuration file is used to configure a handful of different options for the authentication setup. A generic example of such file is shown below.

In earlier versions of Umbraco up to version 12, the options included only a "ButtonStyle" property to style the button. In version 13+ the default button is now rendered using the Umbraco UI library. This means that the "ButtonStyle" property has been deprecated and should not be used. You can override the default styling of the button by using the "ButtonColor" and "ButtonLook" properties. We recommend leaving these properties empty to use the default styling. The default styling will give your users an optimal login experience.

ProviderBackOfficeExternalLoginProviderOptions.cs
using Microsoft.Extensions.Options;
using Umbraco.Cms.Core;
using Umbraco.Cms.Web.BackOffice.Security;

namespace MyUmbracoProject.CustomAuthentication;

public class ProviderBackOfficeExternalLoginProviderOptions : IConfigureNamedOptions<BackOfficeExternalLoginProviderOptions>
{
    public const string SchemeName = "OpenIdConnect";
    public void Configure(string name, BackOfficeExternalLoginProviderOptions options)
    {
        if (name != Constants.Security.BackOfficeExternalAuthenticationTypePrefix + SchemeName)
        {
            return;
        }

        Configure(options);
    }

    public void Configure(BackOfficeExternalLoginProviderOptions options)
    {
        // Customize the login button
        options.Icon = "icon-cloud";

        // The following options are relevant if you
        // want to configure auto-linking on the authentication.
        options.AutoLinkOptions = new ExternalSignInAutoLinkOptions(

            // Set to true to enable auto-linking
            autoLinkExternalAccount: true,

            // [OPTIONAL]
            // Default: "Editor"
            // Specify User Group.
            defaultUserGroups: new[] { Constants.Security.EditorGroupAlias },

            // [OPTIONAL]
            // Default: The culture specified in appsettings.json.
            // Specify the default culture to create the User as.
            // It can be dynamically assigned in the OnAutoLinking callback.
            defaultCulture: null,

            // [OPTIONAL]
            // Disable the ability to link/unlink manually from within
            // the Umbraco backoffice.
            // Set this to false if you don't want the user to unlink
            // from this external provider.
            allowManualLinking: false
        )
        {
            // [OPTIONAL] Callback
            OnAutoLinking = (autoLinkUser, loginInfo) =>
            {
                // Customize the user before it's linked.
                // Modify the User's groups based on the Claims returned
                // in the external login info.
            },

            // [OPTIONAL] Callback
            OnExternalLogin = (user, loginInfo) =>
            {
                // Customize the User before it is saved whenever they have
                // logged in with the external provider.
                // Sync the Users name based on the Claims returned
                // in the external login info

                // Returns a boolean indicating if sign-in should continue or not.
                return true;
            }
        };

        // [OPTIONAL]
        // Disable the ability for users to login with a username/password.
        // If set to true, it will disable username/password login
        // even if there are other external login providers installed.
        options.DenyLocalLogin = false;

        // [OPTIONAL]
        // Choose to automatically redirect to the external login provider
        // effectively removing the login button.
        options.AutoRedirectLoginToExternalProvider = false;
    }
}

Icons

If you want to use a custom icon for the login button, you need to add the icon to the Umbraco backoffice. You can do this by adding the icon to the ~/App_Plugins/MyPlugin/BackOffice/Icons folder. The icon should be a SVG file. The icon should be named the same as the icon name you specify in the options.Icon property.

You can use the Umbraco Icon Picker to see available icons.

Advanced properties

Additionally, more advanced custom properties can be added to the BackOfficeExternalLoginProviderOptions.

BackOfficeExternalLoginProviderOptions.CustomBackOfficeView

In earlier versions of Umbraco up to version 12, this property had to define an AngularJS HTML view. This is no longer the case. You can now define a JavaScript module to render a Custom Element instead of the default external login button.

It is still supported to load an HTML file as a view. However, Umbraco no longer supports AngularJS and the HTML file will be loaded into the DOM as-is. You will have to implement all the logic yourself.

The CustomBackofficeView allows for specifying a JavaScript module to render a Custom Element instead default external login button. Use this in case you want to change the UI or one of the following:

  • You want to display something different where external login providers are listed: in the login screen vs the backoffice panel vs on the logged-out screen. This same view will render in all of these cases but you can use the current route parameters to customize what is shown.

  • You want to change how the button interacts with the external login provider. For example, instead of having the site redirect on button-click, you want to open a popup window to load the external login provider.

The path to the custom view is a virtual path, like this example: "~/App_Plugins/MyPlugin/BackOffice/my-external-login.js".

When a custom view is specified it is 100% up to this module to perform all required logic.

The module should define a Custom Element and export it as default. The Custom Element can optionally declare a number of properties to be passed to it. These properties are:

  • providerName: The name of the provider. This is the same name as the provider's scheme name.

  • displayName: The display name of the provider. This is the same display name as the provider's display name.

  • externalLoginUrl: The URL to redirect to when the button is clicked.

  • userViewState: The current view state of the user. This can be one of the following values:

    • loggingIn: The user is on the login screen.

    • loggedIn: The user is on the backoffice panel.

    • loggedOut: The user clicked the logout button and is on the logged-out screen.

    • timedOut: The user's session has timed out and they are on the timed-out screen.

TypeScript

If you use TypeScript, you can use this interface to define the properties:

login-types.ts
type UserViewState = 'loggingIn' | 'loggedIn' | 'loggedOut' | 'timedOut';

interface IExternalLoginCustomViewElement {
  displayName?: string;
  providerName?: string;
  externalLoginUrl?: string;
  userViewState?: UserViewState;
};

Examples

The Custom Element can be implemented in a number of ways with many different libraries or frameworks. The following examples show how to make a button appear and redirect to the external login provider. You will learn how to use the externalLoginUrl property to redirect to the external login provider. The login form should look like this when you open Umbraco:

When you click the button, the form will submit a POST request to the externalLoginUrl property. The external login provider will then redirect back to the Umbraco site with the user logged in.

You have access to the Umbraco UI Library in the custom element. You can use the components directly in your custom element.

We have to define a template first and then the custom element itself. The template is a small HTML form with a button. The button will submit the form to the externalLoginUrl property. The custom element will then render the template and attach it to the shadow DOM and wire up the externalLoginUrl property in the connectedCallback method.

~/App_Plugins/MyPlugin/BackOffice/my-external-login.js
const template = document.createElement('template');
template.innerHTML = `
  <style>
    :host {
      display: block;
      width: 100%;
    }
    #button {
      width: 100%;
    }
  </style>
  <form method="post" action="/404">
    <input type="hidden" name="provider" value="" />
    <h3>My Company's Provider</h3>
    <p>If you have signed up with MyProvider, you can sign in to Umbraco by clicking the button below.</p>
    <uui-button type="submit" id="button" look="primary">
      <uui-icon name="icon-cloud"></uui-icon>
      Sign in with MyProvider
    </uui-button>
  </form>
`;

export class MyCustomView extends HTMLElement {
  externalLoginUrl;

  constructor() {
    super();
    this.attachShadow({ mode: 'open' });
    this.shadowRoot.appendChild(template.content.cloneNode(true));
  }

  connectedCallback() {
    this.shadowRoot.querySelector('form').setAttribute('action', this.externalLoginUrl);
    this.shadowRoot.querySelector('input[name="provider"]').setAttribute('value', this.providerName);
  }
}

customElements.define('my-custom-view', MyCustomView);

export default MyCustomView;

Static extension class

The extension class is required to extend on the default authentication implementation in Umbraco CMS. A generic example of such extension class can be seen below.

ProviderBackofficeAuthenticationExtensions.cs
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Extensions;
using Umbraco.Cms.Web.BackOffice.Security;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;

namespace MyUmbracoProject.CustomAuthentication;

public static class ProviderBackofficeAuthenticationExtensions
{
    public static IUmbracoBuilder AddProviderBackofficeAuthentication(this IUmbracoBuilder builder)
    {
        // Register ProviderBackOfficeExternalLoginProviderOptions here rather than require it in startup
        builder.Services.ConfigureOptions<ProviderBackOfficeExternalLoginProviderOptions>();

        builder.AddBackOfficeExternalLogins(logins =>
        {
            logins.AddBackOfficeLogin(
                backOfficeAuthenticationBuilder =>
                {
                    // The scheme must be set with this method to work for the back office
                    var schemeName =
                        backOfficeAuthenticationBuilder.SchemeForBackOffice(GoogleBackOfficeExternalLoginProviderOptions
                            .SchemeName);

                    ArgumentNullException.ThrowIfNull(schemeName);

                    backOfficeAuthenticationBuilder.AddProvider(
                        schemeName,
                        options =>
                        {
                            // Callback path: Represents the URL to which the browser should be redirected to.
                            // The default value is '/signin-provider'.
                            // The value here should match what you have configured in you external login provider.
                            // The value needs to be unique.
                            options.CallbackPath = "/umbraco-provider-signin";
                            options.ClientId = "YOURCLIENTID"; // Replace with your client id generated while creating OAuth client ID
                            options.ClientSecret = "YOURCLIENTSECRET"; // Replace with your client secret generated while creating OAuth client ID

                            // Example: Map Claims
                            // Relevant when using auto-linking.
                            options.GetClaimsFromUserInfoEndpoint = true;
                            options.TokenValidationParameters.NameClaimType = "name";

                            // Example: Add scopes
                            options.Scope.Add("email");
                        });
                });
        });
        return builder;
    }
}

For a more in-depth article on how to set up OAuth providers in .NET refer to the Microsoft Documentation.

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