In the Windows AD domain environment, how to use the Kerberos protocol to achieve automatic login of web applications?

Use Kerberos to achieve automatic login of web applications in Windows AD domain environment

This article introduces how to use the Kerberos protocol to achieve seamless and automatic login of web applications in the Windows Active Directory domain environment, and focuses on the Web server scenarios developed using Go and Node.js. We assume that you already have a Windows AD domain and have mastered the method of exporting keytab files from the domain.

The following answers address the key questions raised in the article:

1. setspn command execution location: The setspn command must be run on the Windows domain controller. This is because the service principal name (SPN) is stored in the domain controller's Active Directory database and is used to associate the service with Kerberos credentials. The client machine does not have permission to directly modify the domain controller database.

2. Host name in SPN: In the command setspn -A HTTP/host.domain.local domain\\user , host.domain.local represents the fully qualified domain name (FQDN) of the web application server. It explicitly identifies the server that provides HTTP services.

3. Go Web server-side Kerberos library: Go language jcmturner/gokrb5 library is a powerful Kerberos client library that handles the details of Kerberos authentication, such as obtaining and verifying tickets. Go web servers do not need to use Kerberos command line tools (such as kinit ). The gokrb5 library will do this for you.

4. Go Web Server Deployment Location: The Go Web Server does not have to be deployed on a domain-joined Windows machine. It can be deployed on any machine that has access to a domain controller and uses the Kerberos library, including Linux machines. This is the advantage of using cross-platform libraries such as jcmturner/gokrb5 . Make sure your server can resolve domain names and communicate with the domain controller network.

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