You say, "No, I just moved to town." The librarian says, "Well, I can't let you check out the book until you have a library card. The librarian asks if you have your library card. You find a book that you want to read and take it up to the counter. You can compare a SAML sign-on experience to that of checking out a library book: After they’re received, the SP gives users access to the resources they requested. The IdP issues SAML assertions, or tokens, which contain the information necessary to confirm user identities, including the time the assertions were issued and the conditions that make the assertions valid. When users attempt to access these applications or services, the SP asks the IdP to verify their identities. It’s the SPs’ job to say, “You can access these applications or services for a specified period of time without having to sign-on again.” These applications or services might include email platforms, such as Google or Microsoft Office, or communications apps, such as Slack or Skype. The SP hosts the applications and services that users want to access. It's the IdPs’ job to say, “I know this person, and they should be able to access these resources.” The IdP stores all of the user credentials and information necessary for authorization and provides it to the SP, when requested. Instead, they’re handled by identity providers (IdPs) and service providers (SPs): Most importantly, SAML sign-on experiences are secure because user credentials are never transmitted. Designed to simplify user sign-on experiences, SAML is most widely used in enterprise organizations and allows users to access applications and services that they pay for. ![]() SSO allows users to sign on to multiple web-based applications and services using a single set of credentials. User authenticates using one of the configured login options, and may see a consent prompt listing the permissions Auth0 will give to the application.Īuth0 Authorization Server redirects user back to application with single-use authorization code.Īuth0's SDK sends authorization code, application's client ID, and application's credentials, such as client secret or Private Key JWT, to Auth0 Authorization Server ( /oauth/token endpoint).Īuth0 Authorization Server verifies authorization code, application's client ID, and application's credentials.Īuth0 Authorization Server responds with an ID token and access token (and optionally, a refresh token).Īpplication can use the access token to call an API to access information about the user.SAML (Security Assertion Markup Language) is an open authentication standard that makes single sign-on (SSO) to web applications possible.
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