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Introduction Integrating our Linux instances with Microsoft Active Directory (AD) can streamline user management, here will walk you through the steps needed to integrate a Linux instance with an AD domain, allowing centralized authentication and authorization using AD credentials.Why we use AD integration For improving security and ensure consistent access controls across hybrid environment.PrerequisitesBefore starting the integration process, ensure you have the following:Active Directory Domain: An existing AD domain that you want to integrate with.Linux Instance: A Linux instance with network connectivity to the AD domain controller.Administrator Access: Sudo or root access to the Linux instance.Domain Admin Credentials: Access to an AD account with permissions to join devices to the domain. Install Required PackagesInstall the necessary packages on Linux instance to enable communication with AD.For RHEL/CentOS:sudo yum install realmd sssd sssd-tools samba-common oddjob oddjob-mkhomedir adcli ntp -yFor Ubuntu/Debian:sudo apt-get updatesudo apt-get install realmd sssd sssd-tools samba-common packagekit oddjob oddjob-mkhomedir adcli ntp -yNote: (These packages include tools for joining the domain (`realmd`), a service for managing domain authentication (`sssd`), and dependencies for handling AD communication) Discover the Active Directory DomainDiscover the AD domain to ensure your Linux instance can see and communicate with it.Run the following command to discover the domain:sudo realm discover “your_domain.com”Note: (Replace `your_domain.com` with the actual domain name. This command should return information about the domain, including its fully qualified domain name (FQDN) and configured services.) Join the Linux Instance to the AD DomainAfter discovering the domain, proceed to join the Linux instance to the AD domain.Use the following command to join the domain:sudo realm join –user=your_admin_user “your_domain.com”Note: (Replace `your_admin_user` with your AD admin username and `your_domain.com` with your actual domain name. You’ll be prompted to enter the password for the AD admin account).After joining the domain, verify the join status:realm listNote: (This command should show that the Linux instance is now part of the domain).Configure SSSD for AuthenticationThe System Security Services Daemon (SSSD) handles authentication to the AD domain. After joining the domain, ensure SSSD is properly configured.Edit the `/etc/sssd/sssd.conf` file (it may be auto configured during the join process):sudo vi /etc/sssd/sssd.confEnsure the following settings are configured:[sssd]domains

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Continuing my previous post walking through a Linux server install with an eye toward creating a standard build, this post contains a set of easy steps to configure Active Directory (AD) authentication on Linux for your standard user accounts. This post makes a great companion piece because it's the first thing I do after completing my Linux builds. Let's get right to it, shall we?Note: this post is specific to Debian and derivatives (verified working on Ubuntu 24.04 also), but should be fairly easily adapted to other Linux distros.Step 1 - Create a BackupAfter completing your initial server build and installing the base packages, it's a great time to create a backup/snapshot, if you haven't already. Step 2 - PrerequisitesIn order to complete these steps, you'll need to ensure a few prerequisites are in place:Pretty obviously, a working Active Directory domain; you'll need to know both hostname and IP address for your AD DNS server and at least one domain controller.Your Linux server, configured with a static IP address, a hostname that's unique among your domain-joined computers, configured for DNS resolution against your AD DNS server.On the Linux server, we'll enable root to login via SSH temporarily for troubleshooting/configuration purposes.Create an AD group to contain the user accounts permitted to authenticate to the Linux servers. (Optional) Create an AD account with permission to query AD for troubleshooting, both now and for future tasks; see my previous article about searching AD with Linux using ldapsearch for reference.An AD account with permission to query AD, for testing/troubleshooting purposes. I've uploaded sample copies of all the files referenced in this post to the Solo Admin Github repository, under the "posts/active-directory-authentication-on-linux" folder. Feel free to grab them and customize them for your environment.For the purposes of this post, the AD domain will be domain.com, the Linux server will be called server.domain.com, and the AD domain controller will be called dc.domain.com. Do NOT keep these default values! They must be updated for your environment.Now that the prerequisites are in place, we'll be following the steps at rather than reinvent the wheel with an identical walkthrough. Here are some notes on the process:Make sure and explicitly update /etc/hosts, modifying the entry with your server's name to reflect its IP, instead of 127.0.0.1. Ping by name to verify that it no longer resolves to 127.0.0.1. 192.168.0.1 server.domain.com serverIn my environment, I've replaced the ntp package with ntpsec. The ntp.conf file in the repo works identically for either.When changing ownership after the first successful login, I've always used Domain Users for my group designation, e.g.chown -R :"Domain Users" /home//.sshAs I mentioned previously, having an account for AD integration can come in handy at any step of this process when trying to troubleshoot, and the excellent ldapsearch Linux utility is your friend. NOTE - this guide, and the linked Debian HOW-TO page, are for authentication only, and not SAMBA file servers/domain controllers, etc. Your server, by virtue of the final join-ad.sh script, will have a computer account in the

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= your_domain.comconfig_file_version = 2services = nss, pam[domain/your_domain.com]ad_domain = your_domain.comkrb5_realm = YOUR_DOMAIN.COMrealmd_tags = manages-system joined-with-sambacache_credentials = trueid_provider = adkrb5_store_password_if_offline = truedefault_shell = /bin/bashldap_id_mapping = trueuse_fully_qualified_names = falsefallback_homedir = XXXXXaccess_provider = simpleSet appropriate permissions on the `sssd.conf` file:sudo chmod 600 /etc/sssd/sssd.confRestart SSSD to apply the changes:sudo systemctl restart sssd Update PAM ConfigurationPAM (Pluggable Authentication Modules) needs to be updated to use SSSD for authentication.Enable automatic home directory creation for AD users:sudo authconfig –enablemkhomedir –updateTest the IntegrationTo ensure that the integration is successful, test logging in with an AD user account.Try switching to an AD user:su – ad_userNote: Replace `ad_user` with an actual AD user account. If the integration is successful, you should be logged in as that user, and a home directory should be created automatically.(Optional) Restrict Login AccessIf you want to restrict which AD users can log in to the Linux instance, you can configure access controls in `/etc/sssd/sssd.conf`.For example, to allow only certain AD groups:access_provider = simplesimple_allow_groups = ad_group1, ad_group2Note: (Replace `ad_group1` and `ad_group2` with the actual AD group names). ConclusionIntegrating a Linux instance with Active Directory can significantly simplify user management and enhance security by centralizing authentication and authorization. By following this guide, you can ensure a smooth integration, allowing AD users to log in to your Linux instance with their domain credentials Recent Posts

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Linux Distros Subscribe to PIA VPN and download our Linux app. Log in and connect to any server location.Enjoy added security and privacy on Linux. Install an Ad & Malware BlockerWhile Linux is considered one of the most secure OSs, it’s still vulnerable to malware. Having a bit of backup if you click on, or download, something you shouldn’t is a good idea. Most malware infections on Linux are rooted in user error. For example, not vetting an app properly or downloading from an untrustworthy source. Look for a multipurpose malware blocker that includes anti-tracking tools and allows you to customize your settings. PIA VPN for Linux includes MACE, an all-in-one ad, malware, and tracker blocker. MACE stops threats at the DNS level before they can reach your device and do damage. FAQWhat is the best Linux distro for privacy?One of the best Linux distro for privacy is Kodachi, but it requires some knowledge of Linux operating systems, so it may not be the best OS for first-time users. If you’re looking for an easy-to-use, privacy-friendly Linux distro, try QubesOS. Which Linux distro has Tor built in?Kodachi, QubesOS, Tails, and several other Linux distros have Tor built directly into them, often as the default search engine. You can manually install Tor on other Linux distros, or buy a VPN for Linux to encrypt your traffic and use any browser more safely. Which Linux is best for defensive security?QubesOS is the best Linux distro for defensive security. It allows you to contain specific apps in so-called qubes (e.g. Work or Unsecure) which run independently, so if you visit an unknown site in one qube and get malware, it doesn’t spread to others. Another way to prevent malware is to use PIA MACE. It blocks ads, malware, and trackers at the DNS

Linux - AD Authentication - LinuxQuestions.org

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