Security Assertion Markup Language (SAML) 2.0 Profile for OAuth 2.0 Client Authentication and Authorization Grants
RFC 7522
Internet Engineering Task Force (IETF) B. Campbell
Request for Comments: 7522 Ping Identity
Category: Standards Track C. Mortimore
ISSN: 2070-1721 Salesforce
M. Jones
Microsoft
May 2015
Security Assertion Markup Language (SAML) 2.0 Profile
for OAuth 2.0 Client Authentication and Authorization Grants
Abstract
This specification defines the use of a Security Assertion Markup
Language (SAML) 2.0 Bearer Assertion as a means for requesting an
OAuth 2.0 access token as well as for client authentication.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7522.
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Campbell, et al. Standards Track [Page 1]
RFC 7522 OAuth SAML Assertion Profiles May 2015
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Notational Conventions . . . . . . . . . . . . . . . . . 4
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
2. HTTP Parameter Bindings for Transporting Assertions . . . . . 4
2.1. Using SAML Assertions as Authorization Grants . . . . . . 4
2.2. Using SAML Assertions for Client Authentication . . . . . 5
3. Assertion Format and Processing Requirements . . . . . . . . 6
3.1. Authorization Grant Processing . . . . . . . . . . . . . 8
3.2. Client Authentication Processing . . . . . . . . . . . . 9
4. Authorization Grant Example . . . . . . . . . . . . . . . . . 9
5. Interoperability Considerations . . . . . . . . . . . . . . . 11
6. Security Considerations . . . . . . . . . . . . . . . . . . . 11
7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 12
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
8.1. Sub-Namespace Registration of
urn:ietf:params:oauth:grant-type:saml2-bearer . . . . . . 12
8.2. Sub-Namespace Registration of
urn:ietf:params:oauth:client-assertion-type:saml2-bearer 13
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
9.1. Normative References . . . . . . . . . . . . . . . . . . 13
9.2. Informative References . . . . . . . . . . . . . . . . . 14
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
The Security Assertion Markup Language (SAML) 2.0
[OASIS.saml-core-2.0-os] is an XML-based framework that allows
identity and security information to be shared across security
domains. The SAML specification, while primarily targeted at
providing cross domain Web browser single sign-on (SSO), was also
designed to be modular and extensible to facilitate use in other
contexts.
The Assertion, an XML security token, is a fundamental construct of
SAML that is often adopted for use in other protocols and
specifications. (Some examples include [OASIS.WSS-SAMLTokenProfile]
and [OASIS.WS-Fed].) An Assertion is generally issued by an Identity
Provider and consumed by a Service Provider that relies on its
content to identify the Assertion's subject for security-related
purposes.
The OAuth 2.0 Authorization Framework [RFC6749] provides a method for
making authenticated HTTP requests to a resource using an access
token. Access tokens are issued to third-party clients by an
authorization server (AS) with the (sometimes implicit) approval of
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