Network Working Group S. Cantor
Internet-Draft Shibboleth Consortium
Intended status: Standards Track S. Josefsson
Expires: November 14, 2013 SJD AB
May 13, 2013
SAML Enhanced Client SASL and GSS-API Mechanisms
draft-ietf-kitten-sasl-saml-ec-09.txt
Abstract
Security Assertion Markup Language (SAML) 2.0 is a generalized
framework for the exchange of security-related information between
asserting and relying parties. Simple Authentication and Security
Layer (SASL) and the Generic Security Service Application Program
Interface (GSS-API) are application frameworks to facilitate an
extensible authentication model. This document specifies a SASL and
GSS-API mechanism for SAML 2.0 that leverages the capabilities of a
SAML-aware "enhanced client" to address significant barriers to
federated authentication in a manner that encourages reuse of
existing SAML bindings and profiles designed for non-browser
scenarios.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on November 14, 2013.
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This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Applicability for Non-HTTP Use Cases . . . . . . . . . . . . . 7
4. SAML SASL Mechanism Specification . . . . . . . . . . . . . . 10
4.1. Advertisement . . . . . . . . . . . . . . . . . . . . . . 10
4.2. Initiation . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3. Server Response . . . . . . . . . . . . . . . . . . . . . 11
4.4. User Authentication with Identity Provider . . . . . . . . 11
4.5. Client Response . . . . . . . . . . . . . . . . . . . . . 11
4.6. Outcome . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.7. Additional Notes . . . . . . . . . . . . . . . . . . . . . 11
5. SAML EC GSS-API Mechanism Specification . . . . . . . . . . . 13
5.1. GSS-API Credential Delegation . . . . . . . . . . . . . . 13
5.2. GSS-API Channel Binding . . . . . . . . . . . . . . . . . 14
5.3. Session Key Derivation . . . . . . . . . . . . . . . . . . 15
5.3.1. Generated by Identity Provider . . . . . . . . . . . . 16
5.3.2. Alternate Key Derivation Mechanisms . . . . . . . . . 16
5.4. Per-Message Tokens . . . . . . . . . . . . . . . . . . . . 17
5.5. Pseudo-Random Function (PRF) . . . . . . . . . . . . . . . 17
5.6. GSS-API Principal Name Types for SAML EC . . . . . . . . . 18
5.6.1. User Naming Considerations . . . . . . . . . . . . . . 18
5.6.2. Service Naming Considerations . . . . . . . . . . . . 19
6. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7. Security Considerations . . . . . . . . . . . . . . . . . . . 28
7.1. Risks Left Unaddressed . . . . . . . . . . . . . . . . . . 28
7.2. User Privacy . . . . . . . . . . . . . . . . . . . . . . . 28
7.3. Collusion between RPs . . . . . . . . . . . . . . . . . . 29
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 30
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