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AspNetSaml

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Very simple SAML 2.0 consumer module for ASP.NET/C#

파일 탐색기

최종 버전 다운로드 (.zip)

- - dotnet.yml
  - release.yml
- AspNetSaml.csproj
- Saml.cs
- AspNetSaml.Tests.csproj
- UnitTests.cs
- Usings.cs
- - launchSettings.json
- appsettings.json
- AspNetSaml.WebExample.csproj
- Program.cs
- README
.gitignore
AspNetSaml.sln
LICENSE
README.md
testenvironments.json

# 설치 가이드

1. 코드 내려받기

git clone https://github.com/jitbit/AspNetSaml

깃허브에서 프로젝트 코드 전체를 내 컴퓨터로 내려받습니다.

cd AspNetSaml

방금 내려받은 프로젝트 폴더 안으로 이동합니다.

2. .NET

보통 추천

사전 준비물

Git GitHub에서 프로젝트 코드를 내려받으려면 필요합니다.
.NET SDK dotnet 명령어를 쓰기 위한 SDK입니다.

cd AspNetSaml.Tests

이 프로젝트의 관련 파일이 하위 폴더 안에 있어서, 먼저 그 폴더로 이동합니다.

dotnet restore

프로젝트에 필요한 패키지를 내려받습니다.

dotnet run

프로젝트를 빌드하고 바로 실행합니다.

✅ dotnet run 실행 후 터미널에 나타나는 안내 메시지나 주소를 확인하세요.

// repository documentation

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![](https://github.com/jitbit/AspNetSaml/actions/workflows/dotnet.yml/badge.svg)

# AspNetSaml

Very short and simple SAML 2.0 "consumer" implementation in C#.

It's a *SAML client* library, not a *SAML server*. As in - allows adding SAML single-sign-on to your ASP.NET app, but *not* to provide auth services to other apps. In other words, it's a library for "service-providers" not for "identity providers".

## Installation

`Install-Package AspNetSaml`

Adds a very small .NET Standard 2.0 library (11KB dll) that works with both ASP.NET Core and the "old" ASP.NET Framework. Please refer to [releases](https://github.com/jitbit/AspNetSaml/releases) for the change log.

# Usage

## How SAML works? (please read this)

SAML workflow has 2 steps:

1. User is redirected to the SAML provider (with some magic in the query-string) where he authenticates
2. User is redirected back to your app, where you validate the payload

Here's how you do it (this example is for ASP.NET Core MVC):

## 1. Redirecting the user to the saml provider:

```c#
//this example is an ASP.NET Core MVC action method
public IActionResult Login()
{
	//TODO: specify the SAML provider url here, aka "Endpoint"
	var samlEndpoint = "http://saml-provider-that-we-use.com/login/";

var request = new AuthRequest(
		"http://www.myapp.com", //TODO: put your app's "entity ID" here
		"http://www.myapp.com/SamlConsume" //TODO: put Assertion Consumer URL (where the provider should redirect users after authenticating)
	);

//now send the user to the SAML provider
	return Redirect(request.GetRedirectUrl(samlEndpoint));
}
```

## 2. User has been redirected back

User is sent back to your app - you need to validate the SAML response ("assertion") that you recieved via POST.

Here's an example of how you do it in ASP.NET Core MVC

```c#
//ASP.NET Core MVC action method... But you can easily modify the code for old .NET Framework, minimal API etc.
public async Task<IActionResult> SamlConsume()
{
	// 1. TODO: specify the certificate that your SAML provider gave you
	string samlCertificate = @"-----BEGIN CERTIFICATE-----
BLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAHBLAH123543==
-----END CERTIFICATE-----";

// 2. Let's read the data - SAML providers usually POST it into the "SAMLResponse" var
	var samlResponse = new Response(samlCertificate, Request.Form["SAMLResponse"]);

// 3. Validate the response. "audienceEntityId" is your app's EntityID.
	var audienceEntityId = "http://www.myapp.com";
	if (samlResponse.IsValid(audienceEntityId)) //all good?
	{
		//WOOHOO!!! the user is logged in
		var username = samlResponse.GetNameID(); //let's get the username
		
		//the user has been authenticated, now what?
		//we can call context.SignInAsync() for ASP.NET Core
		//or call FormsAuthentication.SetAuthCookie() for .NET Framework
		//or do something else, like set a cookie or something...
		
		//FOR EXAMPLE this is how you sign-in a user in ASP.NET Core 3,5,6,7,8
		await context.SignInAsync(new ClaimsPrincipal(
			new ClaimsIdentity(
				new[] { new Claim(ClaimTypes.Name, username) },
				CookieAuthenticationDefaults.AuthenticationScheme)));
		//Yeah, it's a mouthful, sorry, not my fault
		
		return Redirect("~/"); //redirect authenticated user back to homapage for example
	}
	
	return Content("Unauthorized");
}
```

# Bonus: reading more attributes from the provider

SAML providers usually send more data with their response: username, first/last names etc. Here's how to get it:

```c#
if (samlResponse.IsValid("http://www.myapp.com")) //your app's EntityID
{
	//WOOHOO!!! user is logged in

//Some more optional stuff
	//let's extract username/firstname etc
	try
	{
		var username = samlResponse.GetNameID();
		var email = samlResponse.GetEmail();
		var firstname = samlResponse.GetFirstName();
		var lastname = samlResponse.GetLastName();
		
		//or read some custom-named data that you know the IdP sends
		var officeLocation = samlResponse.GetCustomAttribute("OfficeAddress");
	}
	catch (Exception ex)
	{
		//insert error handling code
		//in case some extra attributes are not present in XML, for example
		return null;
	}
}
```

# Notes about the source code

All the functionality sits in one single short file [Saml.cs](https://github.com/jitbit/AspNetSaml/blob/master/AspNetSaml/Saml.cs) other stuff in this repo are just unit tests, nuget-packaging etc. You can take that file and throw it in your project, it should work just fine.

P.S. This library has been battle-tested for years in production in our [helpdesk app](https://www.jitbit.com/helpdesk/) please check it out if you're looking for a ticketing system for your team. Cheers.