SAML Enhanced Client SASL and GSS-API Mechanisms
draft-ietf-kitten-sasl-saml-ec-19
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Network Working Group S. Cantor
Internet-Draft Shibboleth Consortium
Intended status: Standards Track S. Josefsson
Expires: February 29, 2020 SJD AB
August 28, 2019
SAML Enhanced Client SASL and GSS-API Mechanisms
draft-ietf-kitten-sasl-saml-ec-19
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.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on February 29, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
Cantor & Josefsson Expires February 29, 2020 [Page 1]
Internet-Draft SAML ECP SASL & GSS-API Mechanisms August 2019
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Applicability for Non-HTTP Use Cases . . . . . . . . . . . . 5
4. SAML Enhanced Client SASL Mechanism Specification . . . . . . 8
4.1. Advertisement . . . . . . . . . . . . . . . . . . . . . . 8
4.2. Initiation . . . . . . . . . . . . . . . . . . . . . . . 8
4.3. Server Response . . . . . . . . . . . . . . . . . . . . . 9
4.4. User Authentication with Identity Provider . . . . . . . 9
4.5. Client Response . . . . . . . . . . . . . . . . . . . . . 9
4.6. Outcome . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.7. Additional Notes . . . . . . . . . . . . . . . . . . . . 10
5. SAML EC GSS-API Mechanism Specification . . . . . . . . . . . 10
5.1. GSS-API Credential Delegation . . . . . . . . . . . . . . 11
5.2. GSS-API Channel Binding . . . . . . . . . . . . . . . . . 12
5.3. Session Key Derivation . . . . . . . . . . . . . . . . . 12
5.3.1. Generated by Identity Provider . . . . . . . . . . . 13
5.3.2. Alternate Key Derivation Mechanisms . . . . . . . . . 14
5.4. Per-Message Tokens . . . . . . . . . . . . . . . . . . . 14
5.5. Pseudo-Random Function (PRF) . . . . . . . . . . . . . . 15
5.6. GSS-API Principal Name Types for SAML EC . . . . . . . . 15
5.6.1. User Naming Considerations . . . . . . . . . . . . . 16
5.6.2. Service Naming Considerations . . . . . . . . . . . . 17
6. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7. Security Considerations . . . . . . . . . . . . . . . . . . . 25
7.1. Risks Left Unaddressed . . . . . . . . . . . . . . . . . 26
7.2. User Privacy . . . . . . . . . . . . . . . . . . . . . . 26
7.3. Collusion between RPs . . . . . . . . . . . . . . . . . . 27
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 27
8.1. GSS-API and SASL Mechanism Registration . . . . . . . . . 27
8.2. XML Namespace Name for SAML-EC . . . . . . . . . . . . . 27
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 28
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