Can I use Azure AD with LDAP?

Is Azure AD compatible with LDAP? To make a long story short: Kinda, but it’s not worth the effort because there are better solutions.

Want more details about why LDAP doesn’t work with Azure and the best workaround for LDAP on Azure? Keep reading.

LDAP Doesn’t Work in the Cloud

Simply put, the architecture of cloud-based directories was not built to accommodate LDAP (Lightweight Directory Access Protocol) and LDAP is too old to be compatible with most cloud-based systems.

There’s no single point of failure that makes LDAP untenable, it is technically possible, but just about every aspect of LDAP has been improved upon and replaced by more modern protocols. The reason LDAP is still around is because it is so integral to legacy, on-premises Active Domain environments that are still ubiquitous.

LDAP Is Not Compatible with Azure AD

Straight from the source – Microsoft says that Azure AD does not support LDAP. They offer an alternative solution: set up an Azure AD Domain Services (Azure AD DS) instance and configure some security groups with Azure Networking, then connect LDAP to that.

Using LDAP with Azure AD DS is the only method to connect LDAP to Azure and it’s a tenuous one at best. It does not allow for full utilization of LDAP or Azure features, so it’s really just a bandaid for organizations too stubborn to rework their network infrastructure.

Furthermore, LDAP isn’t secure by today’s standards. The traffic it sends is unencrypted by default, though “Secure LDAP” also exists and uses SSL/TLS. Using an inherently insecure protocol reduces the overall security of your network down to the level of that weakest link.

LDAP relies on PEAP-MSCHAPv2 as its end user authentication protocol, which has several known vulnerabilities. One is that the MSCHAPv2 Hash has been cracked for some time now, allowing hackers to decipher credentials used for network authentication. The second is that it’s incredibly easy for end users to misconfigure their devices network authentication settings, putting themselves at high risk for over-the-air credential theft.

Instead, most organizations today are switching to the EAP-TLS protocol, which replaces credentials with X.509 digital certificates, eliminating the risk of over-the-air credential theft and MITM attacks. In an era where digital certificates are the uncontested frontrunners of secure network authentication, using an antiquated protocol like LDAP is just asking for trouble.

Cloud-Based LDAP Alternatives

azure ad ldapThere’s little reason to keep LDAP around; even organizations that have (or want) to maintain on-premise network infrastructure have better options more suited to modern-day cloud architecture.

Azure AD Connect

Azure AD isn’t a 1:1 replacement for LDAP, but it’s pretty close. It serves as a connector between Azure and Active Directory Federation Services (AD FS). You’ll note that AD FS isn’t the same thing as AD, so it’s not a direct connection to AD, but many AD environments use AD FS anyway.

Azure AD Connect is more than just a federation integration, however. It has other identity management features like user, group, and device synchronization and a convenient pass-through authentication sign-in method that can simplify federated environments.

It’s a good alternative to LDAP because it accomplishes the same primary functions while bridging the gap between cloud and on-premise networks with modern security standards.

SSO Protocols

SAML, OAuth, and OpenID are the most popular Single Sign-On protocols. Comparing them to LDAP is a little bit of an “apples to oranges” comparison, but in the context of an Azure environment, they would be performing similar functions: connecting the user directory to external applications for user authentication.

One potential use case for SSO protocols is to use SAML to issue digital certificates to users, allowing them to self-enroll with their old AD credentials. SAML can be used with Azure AD to authenticate via any cloud RADIUS server.

Given that these protocols were designed to interface with internal identity providers and external web services, it goes without saying that security is a primary consideration. SSO has proven both secure and convenient enough to warrant industry-wide adoption, so it’s likely your organization would benefit from its inclusion.

Dynamic Policy Enforcement for Azure AD

SecureW2 has also developed a solution to fill the hole left by LDAP. Our Cloud RADIUS servers come equipped with the new Dynamic Policy Engine that enables it to perform runtime-level policy decisions like dynamic VLAN segmentation. Using OAuth, it communicates with Azure AD in real-time.

Much like the well-loved user lookup function of LDAP, SecureW2’s Cloud RADIUS can lookup user attributes stored in the directory and use them to implement group policy and user segmentation at the moment of authentication. Our RADIUS comes with a fully-featured Cloud PKI that enables the superior certificate-based authentication, enhancing both security and user experience.

Perhaps the best aspect of our solution is that it is totally vendor-neutral and able to be integrated into any network infrastructure. SecureW2 can utilize your on-prem components or replace them with managed cloud equivalents to suit your organization’s needs. Our robust, single-pane management suite will give you full control over every aspect of your network – local and cloud.

We have affordable options for organization of every size. Click here to see our pricing.


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*** This is a Security Bloggers Network syndicated blog from SecureW2 authored by Patrick Grubbs. Read the original post at: