Re: [Id-event] SAML subject identifier type

Yaron Sheffer <yaronf.ietf@gmail.com> Tue, 14 July 2020 19:32 UTC

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Date: Tue, 14 Jul 2020 22:31:56 +0300
From: Yaron Sheffer <yaronf.ietf@gmail.com>
To: Atul Tulshibagwale <atultulshi=40google.com@dmarc.ietf.org>, Chris Phillips <Chris.Phillips@canarie.ca>
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Thread-Topic: [Id-event] SAML subject identifier type
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Subject: Re: [Id-event] SAML subject identifier type
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I need a lot more context here. So far, subject IDs have denoted durable entities, such as email addresses, phone numbers, account. This is adding a subject ID that denotes an ephemeral entity, basically similar to a session ID. This looks weird from an architectural point of view, and also begs the question, why specifically SAML and not other session types.

 

Thanks,

                Yaron 

 

From: Id-event <id-event-bounces@ietf.org> on behalf of Atul Tulshibagwale <atultulshi=40google.com@dmarc.ietf.org>
Date: Tuesday, July 14, 2020 at 00:14
To: Chris Phillips <Chris.Phillips@canarie.ca>
Cc: "id-event@ietf.org" <id-event@ietf.org>
Subject: Re: [Id-event] SAML subject identifier type

 

Just clarifying the proposal as it stands today (before incorporating Chris's input):

The following section should be added in the "Subject Identifier Types" section:

4.9.  SAML Subject Identifier Type

   The SAML [SAML.REF] Subject Identifier Type describes a subject by
   the assertion identifier in the SAML assertion that was used to
   convey the subject's information to the Receiver.  Subject
   Identifiers of this type MUST contain an ` assertion_id"claim.  The
   value of this claim is a string that is equal to the Assertion
   Identifier in the SAML assertion.  The SAML Subject Identifier Type
   is identified by the name "saml`.

   Below is a non-normative example Subject Identifier for the SAML
   Subject Identifier Type:

   {
     "subject_type": "saml",
     "assertion_id": "_f551d88963ab4e3decb7cfe8f4dcc3f5",
   }

     Figure 8: Example: Subject Identifier for SAML Subject Identifier
                                   Type.

 

 

On Mon, Jul 13, 2020 at 1:22 PM Atul Tulshibagwale <atultulshi@google.com> wrote:

Hi Chris,

I was proposing using the "assertion id" (SAML Core spec, line 553) in the proposal, not the "subject-id" as defined in SAML (spec section 3.3). The main reason was to be able to refer to a session that was established using a specific assertion. If it's useful, we could perhaps extend the SAML subject identifier type in this spec to include either the assertion_id or the subject_id claim.

 

Thanks,

Atul

 

 

On Mon, Jul 13, 2020 at 10:30 AM Chris Phillips <Chris.Phillips@canarie.ca> wrote:

Hi.

Quiet lurker observing..

Thanks for consider the SAML elements.. 

 

Atul, are you referring to the actual session identifier that someone may have where the Subject-Id was exchanged OR the actual Subject-id itself in your reference in the proposal with the github link?

 

I’m trying to square what I see on the git delta on line 294-296 in https://github.com/richanna/secevent/pull/1/commits/b20b6692eb50628927476ca78f9be077ace88994

 

 

And a Subject-id as shown in the example in 3.3.3 here: https://docs.oasis-open.org/security/saml-subject-id-attr/v1.0/cs01/saml-subject-id-attr-v1.0-cs01.html#_Toc536097229

 

What you offered in the example is not a Subject-id  per the OASIS SAML spec as written in section 3.3.1

 

Am I mis-interpreting something?

 

C

 

 

From: Id-event <id-event-bounces@ietf.org> on behalf of Atul Tulshibagwale <atultulshi=40google.com@dmarc.ietf.org>
Date: Monday, July 13, 2020 at 12:17 PM
To: "id-event@ietf.org" <id-event@ietf.org>
Subject: [Id-event] SAML subject identifier type

 

Hi all,

Based on the discussions in the SSE working group within the OpenID Foundation, we would like to propose that the subject identifier specification include a SAML subject identifier type. This is so that sessions established across peers using SAML may be identified in events that include the subject identifier.

 

 A SAML subject identifier has only one claim within it, the assertion id of the SAML assertion used to establish the single sign-on session.

 

This change is also included in my proposal here.

 

Thanks,

Atul

 

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