Here's a simplified version of what that response looks like: node (isolated on its own line above) is the pertinent part of this response. The IdP generates a SAML response with authentication information and forwards it via the user's browser to the assertion consumer service URL (an address given by the SP) provided in the first SAML request. The user then logs in via a form on the identity provider's site. This request forwards info about the service provider to the identity provider and initiates the login process. The Basics of SAMLįirst, a user attempts to access a secured page on the SP server and is redirected to the IdP login page with a SAML request: Let's walk through the flow of a SAML exchange. This XML-based communication usually happens through the user's browser, which allows attackers to intercept and modify it. SAML, or Security Assertion Markup Language, is a common standard that lets an identity provider (IdP) communicate securely with a service provider (SP) and pass on a user's authorization. Hackers, however, see a possible avenue for exploitation, and you'll soon learn how an attacker can exploit a SAML vulnerability to assume another user's identity. I'm sure most of us appreciate the convenience of seeing "Sign in with …" buttons that let us login with a single username. Single sign-on (SSO) lets users login across different sites without having to manage multiple accounts.
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