Network Working Group A. Backman, Ed.
Internet-Draft Amazon
Intended status: Standards Track M. Jones, Ed.
Expires: October 18, 2018 Microsoft
P. Hunt, Ed.
Oracle
M. Scurtescu
Google
M. Ansari
Cisco
A. Nadalin
Microsoft
April 16, 2018
Push-Based SET Token Delivery Using HTTP
draft-ietf-secevent-http-push-00
Abstract
This specification defines how a series of security event tokens
(SETs) may be delivered to a previously registered receiver using
HTTP POST over TLS initiated as a push to the receiver.
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 October 18, 2018.
Copyright Notice
Copyright (c) 2018 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
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(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction and Overview . . . . . . . . . . . . . . . . . . 2
1.1. Notational Conventions . . . . . . . . . . . . . . . . . 3
1.2. Definitions . . . . . . . . . . . . . . . . . . . . . . . 3
2. SET Event Stream Protocol . . . . . . . . . . . . . . . . . . 4
2.1. Event Delivery Process . . . . . . . . . . . . . . . . . 4
2.2. Push Delivery using HTTP . . . . . . . . . . . . . . . . 5
2.3. Error Response Handling . . . . . . . . . . . . . . . . . 7
3. Authentication and Authorization . . . . . . . . . . . . . . 8
3.1. Use of Tokens as Authorizations . . . . . . . . . . . . . 9
4. Security Considerations . . . . . . . . . . . . . . . . . . . 10
4.1. Authentication Using Signed SETs . . . . . . . . . . . . 10
4.2. HTTP Considerations . . . . . . . . . . . . . . . . . . . 10
4.3. TLS Support Considerations . . . . . . . . . . . . . . . 10
4.4. Authorization Token Considerations . . . . . . . . . . . 11
4.4.1. Bearer Token Considerations . . . . . . . . . . . . . 11
5. Privacy Considerations . . . . . . . . . . . . . . . . . . . 11
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Normative References . . . . . . . . . . . . . . . . . . 12
7.2. Informative References . . . . . . . . . . . . . . . . . 13
Appendix A. Other Streaming Specifications . . . . . . . . . . . 14
Appendix B. Acknowledgments . . . . . . . . . . . . . . . . . . 16
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 16
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction and Overview
This specification defines how a stream of SETs (see
[I-D.ietf-secevent-token]) can be transmitted to a previously
registered Event Receiver using HTTP [RFC7231] over TLS. The
specification defines a method to push SETs via HTTP POST.
This specification defines a method for SET delivery in what is known
as Event Streams.
This specification does not define the method by which Event Streams
are defined, provisioned, managed, monitored, and configured and is
out of scope of this specification.
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[[This work is TBD by the SECEVENTS WG]]
1.1. Notational Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
For purposes of readability examples are not URL encoded.
Implementers MUST percent encode URLs as described in Section 2.1 of
[RFC3986] .
Throughout this documents all figures MAY contain spaces and extra
line-wrapping for readability and space limitations. Similarly, some
URI's contained within examples, have been shortened for space and
readability reasons.
1.2. Definitions
This specification assumes terminology defined in the Security Event
Token specification[I-D.ietf-secevent-token] .
The following definitions are defined for Security Event
distribution:
Event Transmitter
A service provider that delivers SETs to other providers known as
Event Receivers. An Event Transmitter is responsible for offering
a service that allows the Event Receiver to check the Event Stream
configuration and status known as the "Control Plane".
Event Receiver
A service provider that registers to receive SETs from an Event
Transmitter and provides an endpoint to receive SETs via HTTP
POST. Event Receivers can check current Event Stream
configuration and status by accessing the Event Transmitters
"Control Plane".
Event Stream
An Event Stream is a defined location, distribution method and
whereby an Event Transmitter and Event Receiver exchange a pre-
defined family of SETs. A Stream is assumed to have configuration
data such as HTTP endpoints, timeouts, public key sets for signing
and encryption, and Event Families.
Subject
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The security subject around which a security event has occurred.
For example, a security subject might per a user, a person, an
email address, a service provider entity, an IP address, an OAuth
Client, a mobile device, or any identifiable thing referenced in
security and authorization systems.
Event
An Event is defined to be an event as represented by a security
event token (SET). See [I-D.ietf-secevent-token].
NumericDate
A JSON numeric value representing the number of seconds from
1970-01-01T00:00:00Z UTC until the specified UTC date/time,
ignoring leap seconds. This is equivalent to the IEEE Std 1003.1,
2013 Edition [POSIX.1] definition "Seconds Since the Epoch", in
which each day is accounted for by exactly 86400 seconds, other
than that non-integer values can be represented. See [RFC3339]
for details regarding date/times in general and UTC in particular.
2. SET Event Stream Protocol
An Event Stream represents the communication channel over which a
series of SETs are delivered to a configured Event Receiver.
2.1. Event Delivery Process
When an Event occurs, the Event Transmitter constructs a SET token
[I-D.ietf-secevent-token] that describes the Event. The Event
Transmitter determines the Event Streams over which the SET should be
distributed to.
How SETs are defined and the process by which Events are identified
for Event Receivers is out-of-scope of this specification.
When a SET is available for an Event Receiver, the Event Transmitter
attempts to deliver the SET based on the Event Receiver's registered
delivery mechanism:
o The Event Transmitter uses an HTTP/1.1 POST to the Event Receiver
endpoint to deliver the SET;
o Or, the Event Transmitter delivers the Event through a different
method not defined by this specification.
In Push-Based SET Delivery Using HTTP, SETs are delivered one at a
time using HTTP POST requests by an Event Transmitter to an Event
Receiver. The HTTP request body is a JSON Web Token [RFC7519] with a
"Content-Type" header of "application/secevent+jwt" as defined in
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Section 2.2 and 6.2 of [I-D.ietf-secevent-token]. Upon receipt, the
Event Receiver acknowledges receipt with a response with HTTP Status
202, as described below in Section 2.2.
After successful (acknowledged) SET delivery, Event Transmitters
SHOULD NOT be required to maintain or record SETs for recovery. Once
a SET is acknowledged, the Event Receiver SHALL be responsible for
retention and recovery.
Transmitted SETs SHOULD be self-validating (e.g. signed) if there is
a requirement to verify they were issued by the Event Transmitter at
a later date when de-coupled from the original delivery where
authenticity could be checked via the HTTP or TLS mutual
authentication.
Upon receiving a SET, the Event Receiver reads the SET and validates
it. The Event Receiver MUST acknowledge receipt to the Event
Transmitter, using the defined acknowledgement or error method.
The Event Receiver SHALL NOT use the Event acknowledgement mechanism
to report Event errors other than relating to the parsing and
validation of the SET.
2.2. Push Delivery using HTTP
This method allows an Event Transmitter to use HTTP POST
(Section 4.3.3 [RFC7231]) to deliver SETs to a previously registered
web callback URI supplied by the Event Receiver as part of an Event
Stream configuration process (not defined by this document).
The SET to be delivered MAY be signed and/or encrypted as defined in
[I-D.ietf-secevent-token].
The Event Stream configuration defines a URI of an Event Receiver
provided endpoint which accepts HTTP POST requests (e.g.
"https://rp.example.com/Events").
The HTTP Content-Type (see Section 3.1.1.5 [RFC7231]) for the HTTP
POST is "application/secevent+jwt" and SHALL consist of a single SET
(see [I-D.ietf-secevent-token]). As per Section 5.3.2 [RFC7231], the
expected media type ("Accept" header) response is "application/json".
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To deliver an Event, the Event Transmitter generates an event
delivery message and uses HTTP POST to the configured endpoint with
the appropriate "Accept" and "Content-Type" headers.
POST /Events HTTP/1.1
Host: notify.examplerp.com
Accept: application/json
Authorization: Bearer h480djs93hd8
Content-Type: application/secevent+jwt
eyJhbGciOiJub25lIn0
.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.
Figure 1: Example HTTP POST Request
Upon receipt of the request, the Event Receiver SHALL validate the
JWT structure of the SET as defined in Section 7.2 [RFC7519]. The
Event Receiver SHALL also validate the SET information as described
in Section 2 [I-D.ietf-secevent-token].
If the SET is determined to be valid, the Event Receiver SHALL
"acknowledge" successful submission by responding with HTTP Status
202 as "Accepted" (see Section 6.3.3 [RFC7231]).
In order to maintain compatibility with other methods of
transmission, the Event Receiver SHOULD NOT include an HTTP response
body representation of the submitted SET or what the SET's pending
status is when acknowledging success. In the case of an error (e.g.
HTTP Status 400), the purpose of the HTTP response body is to
indicate any SET parsing, validation, or cryptographic errors.
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The following is a non-normative example of a successful receipt of a
SET.
HTTP/1.1 202 Accepted
Figure 2: Example Successful Delivery Response
Note that the purpose of the "acknowledgement" response is to let the
Event Transmitter know that a SET has been delivered and the
information no longer needs to be retained by the Event Transmitter.
Before acknowledgement, Event Receivers SHOULD ensure they have
validated received SETs and retained them in a manner appropriate to
information retention requirements appropriate to the SET event types
signaled. The level and method of retention of SETs by Event
Receivers is out-of-scope of this specification.
In the Event of a general HTTP error condition, the Event Receiver
MAY respond with an appropriate HTTP Status code as defined in
Section 6 [RFC7231].
When the Event Receiver detects an error parsing or validating a
received SET (as defined by [I-D.ietf-secevent-token]), the Event
Receiver SHALL indicate an HTTP Status 400 error with an error code
as described in Section 2.3.
The following is an example non-normative error response.
HTTP/1.1 400 Bad Request
Content-Type: application/json
{
"err":"dup",
"description":"SET already received. Ignored."
}
Figure 3: Example HTTP Status 400 Response
2.3. Error Response Handling
If a SET is invalid, the following error codes are defined:
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+-----------+-------------------------------------------------------+
| Err Value | Description |
+-----------+-------------------------------------------------------+
| json | Invalid JSON object. |
| jwtParse | Invalid or unparsable JWT or JSON structure. |
| jwtHdr | In invalid JWT header was detected. |
| jwtCrypto | Unable to parse due to unsupported algorithm. |
| jws | Signature was not validated. |
| jwe | Unable to decrypt JWE encoded data. |
| jwtAud | Invalid audience value. |
| jwtIss | Issuer not recognized. |
| setType | An unexpected Event type was received. |
| setParse | Invalid structure was encountered such as an |
| | inability to parse or an incomplete set of Event |
| | claims. |
| setData | SET event claims incomplete or invalid. |
| dup | A duplicate SET was received and has been ignored. |
+-----------+-------------------------------------------------------+
Table 1: SET Errors
An error response SHALL include a JSON object which provides details
about the error. The JSON object includes the JSON attributes:
err
A value which is a keyword that describes the error (see Table 1).
description
A human-readable text that provides additional diagnostic
information.
When included as part of an HTTP Status 400 response, the above JSON
is the HTTP response body (see Figure 3).
3. Authentication and Authorization
The SET delivery method described in this specification is based upon
HTTP and depends on the use of TLS and/or standard HTTP
authentication and authorization schemes as per [RFC7235]. For
example, the following methodologies could be used among others:
TLS Client Authentication
Event delivery endpoints MAY request TLS mutual client
authentication. See Section 7.3 [RFC5246].
Bearer Tokens
Bearer tokens [RFC6750] MAY be used when combined with TLS and a
token framework such as OAuth 2.0 [RFC6749]. For security
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considerations regarding the use of bearer tokens in SET delivery
see Section 4.4.1.
Basic Authentication
Usage of basic authentication should be avoided due to its use of
a single factor that is based upon a relatively static, symmetric
secret. Implementers SHOULD combine the use of basic
authentication with other factors. The security considerations of
HTTP BASIC, are well documented in [RFC7617] and SHOULD be
considered along with using signed SETs (see SET Payload
Authentication below).
SET Payload Authentication
In scenarios where SETs are signed and the delivery method is HTTP
POST (see Section 2.2), Event Receivers MAY elect to use Basic
Authentication or not to use HTTP or TLS based authentication at
all. See Section 4.1 for considerations.
As per Section 4.1 of [RFC7235], a SET delivery endpoint SHALL
indicate supported HTTP authentication schemes via the "WWW-
Authenticate" header.
Because SET Delivery describes a simple function, authorization for
the ability to pick-up or deliver SETs can be derived by considering
the identity of the SET issuer, or via an authentication method
above. This specification considers authentication as a feature to
prevent denial-of-service attacks. Because SETs are not commands
(see ), Event Receivers are free to ignore SETs that are not of
interest.
For illustrative purposes only, SET delivery examples show an OAuth2
bearer token value [RFC6750] in the authorization header. This is
not intended to imply that bearer tokens are preferred. However, the
use of bearer tokens in the specification does reflect common
practice.
3.1. Use of Tokens as Authorizations
When using bearer tokens or proof-of-possession tokens that represent
an authorization grant such as issued by OAuth (see [RFC6749]),
implementers SHOULD consider the type of authorization granted, any
authorized scopes (see Section 3.3 of [RFC6749]), and the security
subject(s) that SHOULD be mapped from the authorization when
considering local access control rules. Section 6 of the OAuth
Assertions draft [RFC7521], documents common scenarios for
authorization including:
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o Clients using an assertion to authenticate and/or act on behalf of
itself;
o Clients acting on behalf of a user; and,
o A Client acting on behalf of an anonymous user (e.g., see next
section).
When using OAuth authorization tokens, implementers MUST take into
account the threats and countermeasures documented in the security
considerations for the use of client authorizations (see Section 8 of
[RFC7521]). When using other token formats or frameworks,
implementers MUST take into account similar threats and
countermeasures, especially those documented by the relevant
specifications.
4. Security Considerations
4.1. Authentication Using Signed SETs
In scenarios where HTTP authorization or TLS mutual authentication
are not used or are considered weak, JWS signed SETs SHOULD be used
(see [RFC7515] and Security Considerations
[I-D.ietf-secevent-token]). This enables the Event Receiver to
validate that the SET issuer is authorized to deliver SETs.
4.2. HTTP Considerations
SET delivery depends on the use of Hypertext Transfer Protocol and
thus subject to the security considerations of HTTP Section 9
[RFC7230] and its related specifications.
As stated in Section 2.7.1 [RFC7230], an HTTP requestor MUST NOT
generate the "userinfo" (i.e., username and password) component (and
its "@" delimiter) when an "http" URI reference is generated with a
message as they are now disallowed in HTTP.
4.3. TLS Support Considerations
SETs contain sensitive information that is considered PII (e.g.
subject claims). Therefore, Event Transmitters and Event Receivers
MUST require the use of a transport-layer security mechanism. Event
delivery endpoints MUST support TLS 1.2 [RFC5246] and MAY support
additional transport-layer mechanisms meeting its security
requirements. When using TLS, the client MUST perform a TLS/SSL
server certificate check, per [RFC6125]. Implementation security
considerations for TLS can be found in "Recommendations for Secure
Use of TLS and DTLS" [RFC7525].
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4.4. Authorization Token Considerations
When using authorization tokens such as those issued by OAuth 2.0
[RFC6749], implementers MUST take into account threats and
countermeasures documented in Section 8 of [RFC7521].
4.4.1. Bearer Token Considerations
Due to the possibility of interception, Bearer tokens MUST be
exchanged using TLS.
Bearer tokens MUST have a limited lifetime that can be determined
directly or indirectly (e.g., by checking with a validation service)
by the service provider. By expiring tokens, clients are forced to
obtain a new token (which usually involves re-authentication) for
continued authorized access. For example, in OAuth2, a client MAY
use OAuth token refresh to obtain a new bearer token after
authenticating to an authorization server. See Section 6 of
[RFC6749].
Implementations supporting OAuth bearer tokens need to factor in
security considerations of this authorization method [RFC7521].
Since security is only as good as the weakest link, implementers also
need to consider authentication choices coupled with OAuth bearer
tokens. The security considerations of the default authentication
method for OAuth bearer tokens, HTTP BASIC, are well documented in
[RFC7617], therefore implementers are encouraged to prefer stronger
authentication methods. Designating the specific methods of
authentication and authorization are out-of-scope for the delivery of
SET tokens, however this information is provided as a resource to
implementers.
5. Privacy Considerations
If a SET needs to be retained for audit purposes, JWS MAY be used to
provide verification of its authenticity.
Event Transmitters SHOULD attempt to specialize Event Streams so that
the content is targeted to the specific business and protocol needs
of subscribers.
When sharing personally identifiable information or information that
is otherwise considered confidential to affected users, Event
Transmitters and Receivers MUST have the appropriate legal agreements
and user consent or terms of service in place.
The propagation of subject identifiers can be perceived as personally
identifiable information. Where possible, Event Transmitters and
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Receivers SHOULD devise approaches that prevent propagation -- for
example, the passing of a hash value that requires the subscriber to
already know the subject.
6. IANA Considerations
There are no IANA considerations.
7. References
7.1. Normative References
[I-D.ietf-secevent-token]
Hunt, P., Denniss, W., Ansari, M., and M. Jones, "Security
Event Token (SET)", draft-ietf-secevent-token-00 (work in
progress), January 2017.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
Resource Identifier (URI): Generic Syntax", STD 66,
RFC 3986, DOI 10.17487/RFC3986, January 2005,
<https://www.rfc-editor.org/info/rfc3986>.
[RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security
(TLS) Protocol Version 1.2", RFC 5246,
DOI 10.17487/RFC5246, August 2008,
<https://www.rfc-editor.org/info/rfc5246>.
[RFC5988] Nottingham, M., "Web Linking", RFC 5988,
DOI 10.17487/RFC5988, October 2010,
<https://www.rfc-editor.org/info/rfc5988>.
[RFC6125] Saint-Andre, P. and J. Hodges, "Representation and
Verification of Domain-Based Application Service Identity
within Internet Public Key Infrastructure Using X.509
(PKIX) Certificates in the Context of Transport Layer
Security (TLS)", RFC 6125, DOI 10.17487/RFC6125, March
2011, <https://www.rfc-editor.org/info/rfc6125>.
[RFC7159] Bray, T., Ed., "The JavaScript Object Notation (JSON) Data
Interchange Format", RFC 7159, DOI 10.17487/RFC7159, March
2014, <https://www.rfc-editor.org/info/rfc7159>.
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[RFC7231] Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
Protocol (HTTP/1.1): Semantics and Content", RFC 7231,
DOI 10.17487/RFC7231, June 2014,
<https://www.rfc-editor.org/info/rfc7231>.
[RFC7517] Jones, M., "JSON Web Key (JWK)", RFC 7517,
DOI 10.17487/RFC7517, May 2015,
<https://www.rfc-editor.org/info/rfc7517>.
[RFC7519] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
(JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
<https://www.rfc-editor.org/info/rfc7519>.
[RFC7525] Sheffer, Y., Holz, R., and P. Saint-Andre,
"Recommendations for Secure Use of Transport Layer
Security (TLS) and Datagram Transport Layer Security
(DTLS)", BCP 195, RFC 7525, DOI 10.17487/RFC7525, May
2015, <https://www.rfc-editor.org/info/rfc7525>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
7.2. Informative References
[openid-connect-core]
NRI, "OpenID Connect Core 1.0", Nov 2014.
[POSIX.1] Institute of Electrical and Electronics Engineers, "The
Open Group Base Specifications Issue 7", IEEE Std 1003.1,
2013 Edition, 2013.
[RFC3339] Klyne, G. and C. Newman, "Date and Time on the Internet:
Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002,
<https://www.rfc-editor.org/info/rfc3339>.
[RFC6749] Hardt, D., Ed., "The OAuth 2.0 Authorization Framework",
RFC 6749, DOI 10.17487/RFC6749, October 2012,
<https://www.rfc-editor.org/info/rfc6749>.
[RFC6750] Jones, M. and D. Hardt, "The OAuth 2.0 Authorization
Framework: Bearer Token Usage", RFC 6750,
DOI 10.17487/RFC6750, October 2012,
<https://www.rfc-editor.org/info/rfc6750>.
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[RFC7230] Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
Protocol (HTTP/1.1): Message Syntax and Routing",
RFC 7230, DOI 10.17487/RFC7230, June 2014,
<https://www.rfc-editor.org/info/rfc7230>.
[RFC7235] Fielding, R., Ed. and J. Reschke, Ed., "Hypertext Transfer
Protocol (HTTP/1.1): Authentication", RFC 7235,
DOI 10.17487/RFC7235, June 2014,
<https://www.rfc-editor.org/info/rfc7235>.
[RFC7515] Jones, M., Bradley, J., and N. Sakimura, "JSON Web
Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May
2015, <https://www.rfc-editor.org/info/rfc7515>.
[RFC7516] Jones, M. and J. Hildebrand, "JSON Web Encryption (JWE)",
RFC 7516, DOI 10.17487/RFC7516, May 2015,
<https://www.rfc-editor.org/info/rfc7516>.
[RFC7521] Campbell, B., Mortimore, C., Jones, M., and Y. Goland,
"Assertion Framework for OAuth 2.0 Client Authentication
and Authorization Grants", RFC 7521, DOI 10.17487/RFC7521,
May 2015, <https://www.rfc-editor.org/info/rfc7521>.
[RFC7617] Reschke, J., "The 'Basic' HTTP Authentication Scheme",
RFC 7617, DOI 10.17487/RFC7617, September 2015,
<https://www.rfc-editor.org/info/rfc7617>.
[saml-core-2.0]
Internet2, "Assertions and Protocols for the OASIS
Security Assertion Markup Language (SAML) V2.0", March
2005.
Appendix A. Other Streaming Specifications
[[EDITORS NOTE: This section to be removed prior to publication]]
The following pub/sub, queuing, streaming systems were reviewed as
possible solutions or as input to the current draft:
XMPP Events
The WG considered the XMPP events ands its ability to provide a
single messaging solution without the need for both polling and push
modes. The feeling was the size and methodology of XMPP was to far
apart from the current capabilities of the SECEVENTs community which
focuses in on HTTP based service delivery and authorization.
Amazon Simple Notification Service
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Simple Notification Service, is a pub/sub messaging product from AWS.
SNS supports a variety of subscriber types: HTTP/HTTPS endpoints, AWS
Lambda functions, email addresses (as JSON or plain text), phone
numbers (via SMS), and AWS SQS standard queues. It doesn't directly
support pull, but subscribers can get the pull model by creating an
SQS queue and subscribing it to the topic. Note that this puts the
cost of pull support back onto the subscriber, just as it is in the
push model. It is not clear that one way is strictly better than the
other; larger, sophisticated developers may be happy to own message
persistence so they can have their own internal delivery guarantees.
The long tail of OIDC clients may not care about that, or may fail to
get it right. Regardless, I think we can learn something from the
Delivery Policies supported by SNS, as well as the delivery controls
that SQS offers (e.g. Visibility Timeout, Dead-Letter Queues). I'm
not suggesting that we need all of these things in the spec, but they
give an idea of what features people have found useful.
Other information:
o API Reference:
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/
APIReference/Welcome.html
o Visibility Timeouts:
http://docs.aws.amazon.com/AWSSimpleQueueService/latest/
SQSDeveloperGuide/sqs-visibility-timeout.html
Apache Kafka
Apache Kafka is an Apache open source project based upon TCP for
distributed streaming. It prescribes some interesting general
purpose features that seem to extend far beyond the simpler streaming
model SECEVENTs is after. A comment from MS has been that Kafka does
an acknowledge with poll combination event which seems to be a
performance advantage. See: https://kafka.apache.org/intro
Google Pub/Sub
Google Pub Sub system favours a model whereby polling and
acknowledgement of events is done as separate endpoints as separate
functions.
Information:
o Cloud Overview - https://cloud.google.com/pubsub/
o Subscriber Overview - https://cloud.google.com/pubsub/docs/
subscriber
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o Subscriber Pull(poll) - https://cloud.google.com/pubsub/docs/pull
Appendix B. Acknowledgments
The editors would like to thanks the members of the SCIM WG which
began discussions of provisioning events starting with: draft-hunt-
scim-notify-00 in 2015.
The editors would like to thank the authors of draft-ietf-secevent-
delivery-02, on which this draft is based.
The editor would like to thank the participants in the the SECEVENTS
working group for their support of this specification.
Appendix C. Change Log
Draft 00 - AB - Based on draft-ietf-secevent-delivery-02 with the
following changes:
o Renamed to "Push-Based SET Token Delivery Using HTTP"
o Removed references to the HTTP Polling delivery method.
o Removed informative reference to RFC6202.
Authors' Addresses
Annabelle Backman (editor)
Amazon
Email: richanna@amazon.com
Michael B. Jones (editor)
Microsoft
Email: mbj@microsoft.com
URI: http://self-issued.info/
Phil Hunt (editor)
Oracle Corporation
Email: phil.hunt@yahoo.com
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Marius Scurtescu
Google
Email: mscurtescu@google.com
Morteza Ansari
Cisco
Email: morteza.ansari@cisco.com
Anthony Nadalin
Microsoft
Email: tonynad@microsoft.com
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