IdentityServer.LdapExtension 1.0.0

There is a newer version of this package available.
See the version list below for details.
dotnet add package IdentityServer.LdapExtension --version 1.0.0
NuGet\Install-Package IdentityServer.LdapExtension -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="IdentityServer.LdapExtension" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add IdentityServer.LdapExtension --version 1.0.0
#r "nuget: IdentityServer.LdapExtension, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install IdentityServer.LdapExtension as a Cake Addin
#addin nuget:?package=IdentityServer.LdapExtension&version=1.0.0

// Install IdentityServer.LdapExtension as a Cake Tool
#tool nuget:?package=IdentityServer.LdapExtension&version=1.0.0

Build status


IdentityServer4 Ldap Extension (OpenLdap or ActiveDirectory).

Table of content


<a name="installation"/>

The plugin is easy to install to your solution. Built using .Net Standard 2.0. The Nuget package can be installed by either searching the package IdentityServer.LdapExtension or by typing the following command in your package console:

Install-Package IdentityServer.LdapExtension

Configuration on IdentityServer4 server

<a name="IS.BaseConfiguration"/>

An easy extension method have been created in order to add the LDAP as a provider to your IdentityServer. For this you simply have to use the AddLdapUsers<TApplicationUser>(LdapConfigSection, StoreTypeOrCustomStore). The configuration has to be provided or it won't work. The configuration is described here.

In the Startup.cs under ConfigureServices method, you will have something similar to the following by default (Starter pack for IdentityServer). The last line is what you will need to add in order to get started.

// ... Code ...
    .AddLdapUsers<OpenLdapAppUser>(Configuration.GetSection("ldap"), UserStore.InMemory);
// ... Code ...

Application User: 2 (OpenLdapAppUser, ActiveDirectoryAppUser) have been provided with this extension, but you can use your own as long as you implement the interface IAppUser. I encourrage you to provide your own implementation. You might want to have claims/roles based on an active directory group or your attributes within LDAP are not the one I have defined.

Store types:

  1. UserStore.InMemory: Can be used when you test locally. It stores the logged in user in memory in order to avoid querying the LDAP server over and over. It is also used in order to store the external logged in user details (Google, Facebook, etc.).
  2. UserStore.Redis: Same as in memory, but is persisted and will be ready when you restart.
  3. ILdapUserStore implementation: Build your own store implementation and pass it as a parameter.

AppSettings Configuration

<a name="IS.AppSettings"/>

The appsettings.json will require a configuration for the extension. Here's an example using OpenLdap:

  "ldap": { // Name can be of your choosing
    "url": "localhost",
    "port": 389,
    "bindDn": "cn=ldap-ro,dc=contoso,dc=com",
    "bindCredentials": "P@ss1W0Rd!",
    "searchBase": "ou=users,DC=contoso,dc=com",
    "searchFilter": "(&(objectClass=posixAccount)(objectClass=person)(uid={0}))"
    // "redis": "localhost:32771,ssl=false", // Required if using UserStore.Redis 

If you want to see a working demo, you can open the implementation available the sample folder. It is based on the QuickStart from IdentityServer4 WebSite.

You don't have a LDAP for your tests?

<a name="Ldap.Test"/>

It's not a big problem. I wrote a small tutorial/article in order to setup an entire OpenLdap server within Docker in order to not pollute your PC and also to avoid relying on network admnistrator. That way you can play with existing users or create your own users directory. The tutorial/article is available at

Features in progress

<a name="NewFeature"/>

I plan to work on the following:

  • Create a demo page using VueJS + Dotnet instead of Angular demo.
  • Implement the SSL
  • Implement a cache invalidation based on time (After x time without being hit, remove from redis or from memory).


  • Me, the author of the package (@Nordes)

Thanks to:

  • @marianahycit


<a name="license"/>


Regarding the IdentityServer4 Sample - Apache 2 (due to original code a bit updated)

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last updated
3.1.0 26,483 4/14/2021
2.1.49 40,928 6/10/2020
2.1.29 15,803 1/29/2020
2.1.13 3,171 11/29/2019
2.1.8 16,944 4/11/2019
2.1.7 5,362 3/5/2019
2.1.0 3,117 12/1/2018
2.0.0 2,051 11/10/2018
1.0.0 4,753 4/22/2018