HTTP Redirect Bindings transfer data using HTTP redirects and query parameters this type of binding is typically used in authentication requests. The two most popular are HTTP Redirect Binding and HTTP POST Binding. Bindingsīindings are the format in which data is transferred between service providers and identity providers. This flow is usually initiated when a user clicks on the “Login with SSO” button or something similar. In SP-initiated flows, you start out at the service provider, are redirected to the identity provider to authenticate, and are then redirected back to the service provider. In this post, we’ll cover the common SP-initiated flow. SAML supports two different types of flows: those initiated by the service provider and those initiated by the identity provider. Teleport, our SSH and Kubernetes access solution, is also a service provider. Such applications, in addition to knowing a principal name or email address, may need to request additional identity information about a principal, usually to implement role-based access control (RBAC).Įxamples of such applications include Github and Google Apps. In other words, a service provider is an application that offers a single sign-on (SSO) mechanism for its users to log in and access its resources. Service providers take authentication responses received from identity providers and use that information to create and configure sessions. Service providers frequently abbreviated as SP, are the services that are requesting authentication and identity information about the principal. The industry best practice is to consolidate all user identities of an organization in a single identity provider. A few examples of common identity providers: Auth0, Active Directory Federation Services (ADFS), and Okta. Identity providers authenticate principals and return identity information to service providers (see below). Think of identity providers as databases for identity information. Identity ProviderĪn Identity Provider, frequently abbreviated as IdP, is the service that serves as the source of identity information and authentication decision. This metadata is also called identity information and its importance will be explained below. First name, last name, email address, etc. It is helpful to think about the principal having metadata attached to it. You can think of this as the actual human behind the screen, for the remainder of this post, we’ll assume it’s John Smith. The principal is the user trying to authenticate. Unfortunately before going any further we have to define some SAML-specific terminology, of which a fair amount exists. This particular post will be focused on providing an overview of the how and why of SSO and SAML. SAML/SSO can be used to enforce consistent methods of authentication across all internal corporate services, like multifactor authentication and session duration. When an employee joins or leaves a company, you don’t have to worry about the myriad of internal services that now have to be updated, and the ones that will inevitably be missed. The advantage of adopting SAML/SSO from a security perspective is clear: SAML is frequently used to implement internal corporate single sign-on (SSO) solutions where the user logs into a service that acts as the single source of identity which then grants access to a subset of other internal services. At its core, Security Assertion Markup Language (SAML) 2.0 is a means to exchange authorization and authentication information between services.
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