In this article, we will take a deep dive into the security assertion markup language (SAML) and lightweight dictionary access protocol (LDAP) authentication methods, their differences, similarities, and implications. You'll learn about each use case and which access protocol to use for your organization's network. By the end of this article, you'll have a comprehensive understanding of SAML vs. LDAP in terms of how they work and how each can enable secure user authentication.
SAML and LDAP are separate methods for securely authenticating users to network resources such as devices, applications, or databases. Each protocol controls how the users and resources communicate with one another by connecting them with a directory service such as Active Directory.
Security assertion markup language (SAML) is an open-standard protocol for facilitating communication between a user, identity provider, and application. SAML can support virtual private network (VPN), Wi-Fi, and web application services to execute a secure connection—making it useful for cloud-based servers and applications.
SAML simplifies the authentication process by exchanging information between an identity provider (IdP) and a service provider (SP), such as a web application. In this setup, a user will request a service from a service provider, which must then request authentication from the identity provider. SAML streamlines this communication process by only requiring users to log in once with a single set of credentials. When the same protocol is applied to access multiple services with just one login, SAML can enable single sign-on (SSO) verification.
Lightweight directory access protocol (LDAP) is an open-standard and vendor-agnostic application protocol for both verifying users' identities and giving access to on-premises servers, applications, and even some devices. After installing an LDAP client on a user device, it can use transmission control protocol/internet protocol (TCP/IP) to communicate with a directory on the network to access a resource such as an email server, printer, or data set.
Since LDAP doubles as a secure authenticator, the protocol is also used to verify credentials stored in a dictionary service, such as Active Directory. Upon an access request by a user to an LDAP server, the protocol evaluates whether the credential data matches information stored in the directory and if that user is authorized to access that particular network resource.
The difference between SAML and LDAP is that SAML is designed for cloud-based connections using only an IdP and SP to communicate user data. LDAP, however, is typically used for accessing on-premises resources by installing a client on the user's device to connect with a directory service.
SAML is a communication link that uses extensible markup language (XML) to share data formats known as SAML assertions through the internet and between the IdP and SP—enabling it to support server connections through a web application or Wi-Fi services.
On the other hand, LDAP acts as an authentication authority that requires a user and physically installed client to connect to a server through an established LDAP port. From there, they can make an authentication request to the directory to access data, applications, or devices on the network—typically on-premises.
The main similarities between SAML and LDAP are rooted in their purpose—to give users access to a network of organizational resources through secure authentication. They each do this by establishing communication between an IdP (to manage and store user information) and a device, server, or SP (to perform a function).
Another similarity is that both protocols can facilitate SSO verification depending on the configuration of the directory service. Regarding technical operations for managing user access to resources, both are used during authentication and authorization but not for accounting. In other words, the protocols will help verify, add, or reject users but not actually track their activity.
Organizations need to weigh the advantages and disadvantages of each authentication protocol to understand their respective implications fully.
Some of the pros of using SAML include:
SAML also has some cons associated with it such as:
Here are some benefits of using LDAP:
Alternately, some challenges of LDAP include:
SAML and LDAP protocols are primarily used to authorize users' access to an organization's resources and securely authenticate that each user is who they say they are. SAML acts as a communicator that allows IdPs to perform their function—confirm users’ identities. In this way, SAML uses its communication process to create SSO solutions for online applications.
LDAP, in a sense, is an IdP and authority for organizations by helping store and verify credentials in their network. Upon request and authentication, those credentials give users the ability to retrieve information and gain functionality from their software applications and specific devices such as printers.
With these main functions presented, you can organize SAML and LDAP capabilities into a few prominent use cases:
Are you a DevOps manager working on internal or service applications? Or an IT director looking to manage your users and IT resources securely? Each protocol will be better suited for certain circumstances, though both can be used simultaneously or in conjunction to access different types of resources.
However, SAML should be utilized individually if your business or internal applications operate using many storage solutions or servers running in the cloud. SAML is also a better choice for lean teams that may not have the personnel, resources, or expertise to set up an elaborate and highly-secure architecture since most of the work for SAML is completed and operated by the IdP.
On the other hand, LDAP is a more effective protocol route for those still operating in on-premises environments, as that was its initial support purpose. It's also an excellent option for customization since it's entirely open-sourced and compatible with many applications and systems.
Yes. SAML acts as a communicator that sends assertion data between the SP and IdP to authenticate a user. LDAP, however, is considered an authority that actually does the validation. In that sense, LDAP servers can support SAML protocol by acting as the IdP and authority system.
SSO is a convenient authentication method that allows users to access multiple applications and systems using just one login. LDAP is the protocol or communication process that will enable users to access a network resource through a directory service. Developers could use LDAP to allow SSO if a single login were to grant the user access to all databases, apps, and devices on that server.
SAML refers to the process of granting and authenticating user access specifically to cloud and web applications. Developers commonly use SAML protocols to provide access to multiple applications or systems at once with just one login through a directory service—which would be the equivalent of SSO verification.
Since SAML and LDAP require IdPs to verify users, it's crucial to work with a Zero Trust Privileged Access Management (PAM) platform with relevant communication and integration capabilities. Delinea helps control and monitor user authorization by connecting your directory services with essential network resources using LDAP, SAML, and other standard protocols.
Organizations and development teams can securely manage infrastructure access using SSO requirements while obtaining real-time visibility on user activity, all thanks to Delinea's standard protocol compatibility. Everything, including databases, servers, websites, cloud apps, and software tools, can be easily distributed to users and accessed securely through Delinea and its SAML or LDAP communication processing.
Though each has its unique roles, functions, and capabilities, SAML and LDAP provide secure methods for authenticating and authorizing users to access critical network resources. Delinea offers a central infrastructure access platform that is able to use SAML, LDAP, and other protocols to communicate with identity and directory service providers—ensuring connectivity, visibility, and managed access in all your systems.
Want to learn more about using SAML and LDAP protocols to secure your environment? Book a demo today.