8.0 or 8.1?

This code: https://our.umbraco.com/documentation/Reference/Security/authenticate-with-AD works for 8.0. For 8.1, you need to add Mapper, after membershipProvider,. Then make sure you edit the web.config. Change it to: <add key="owin:appStartup" value="ActiveDirectoryStartup" /> where ActiveDirectoryStartup is the name of your OWIN start.

I created a custom ActiveDirectoryPasswordChecker, which also creates the user if it doesn't exist, but that might be over the top.

Full code for 8.1:

[assembly: OwinStartup("ActiveDirectoryStartup", typeof(ActiveDirectoryStartup))]

namespace ActiveDirectoryLogin { public class ActiveDirectoryStartup : UmbracoDefaultOwinStartup { public override void Configuration(IAppBuilder app) { //ensure the default options are configured base.Configuration(app);

        // active directory authentication
        ConfigureBackofficeActiveDirectoryPasswords(app);
    }

    private void ConfigureBackofficeActiveDirectoryPasswords(IAppBuilder app)
    {
        // https://our.umbraco.com/forum/extending-umbraco-and-using-the-api/96654-applicationcontextcurrent-in-umbraco-8#comment-308432
        var applicationContext = Umbraco.Core.Composing.Current.Services;
        IGlobalSettings GlobalSettings = Umbraco.Core.Composing.Current.Configs.Global();
        IUmbracoSettingsSection UmbracoSettings = Umbraco.Core.Composing.Current.Configs.Settings();

        app.ConfigureUserManagerForUmbracoBackOffice<BackOfficeUserManager, BackOfficeIdentityUser>(Umbraco.Web.Composing.Current.RuntimeState, GlobalSettings,
            (options, context) =>
            {
                var membershipProvider = MembershipProviderExtensions.GetUsersMembershipProvider().AsUmbracoMembershipProvider();
                var userManager = BackOfficeUserManager.Create(options,
                    applicationContext.UserService,
                    applicationContext.MemberTypeService,
                    applicationContext.EntityService,
                    applicationContext.ExternalLoginService,
                    membershipProvider,
                    Mapper,
                    UmbracoSettings.Content, GlobalSettings);
                //Set your own custom IBackOfficeUserPasswordChecker   
                userManager.BackOfficeUserPasswordChecker = new ActiveDirectoryPasswordChecker();
                return userManager;
            });
    }
}

}

(replace ActiveDirectoryPasswordChecker() with ActiveDirectoryBackOfficeUserPasswordChecker() for the default, or create the ActiveDirectoryPasswordChecker() to create your own)

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