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As for the unbound groups concern, our initial internal Federation POCs worked well with a single group so far. The proposed hierarchical role groups, or perhaps even supporting nested user groups down the road should offer us more flexibility in terms user and permission management. For example, having a single aggregated group to map to for the federated users.

Personally, I think the max 255 characters constraint is somewhat artificial, unless I am missing something here.


Guang


From: Brant Knudson [mailto:blk at acm.org]
Sent: Friday, February 13, 2015 12:59 PM
To: OpenStack Development Mailing List (not for usage questions)
Subject: Re: [openstack-dev] [keystone] SPFE: Authenticated Encryption (AE) Tokens


We get a lot of complaints about problems caused by persistent tokens, so this would be great to see in K. Given the amount of work required to get it done, which includes taking care of some other issues, like getting revocation events working and refactoring the token code (things which could have been progressing all along...), and considering how long it takes to get changes merged, it seems unlikely that this will make it, but I've been planning all along to prioritize these reviews if that helps.
- Brant

On Fri, Feb 13, 2015 at 1:47 PM, Lance Bragstad <lbragstad at gmail.com<mailto:lbragstad at gmail.com>> wrote:
Hello all,


I'm proposing the Authenticated Encryption (AE) Token specification [1] as an SPFE. AE tokens increases scalability of Keystone by removing token persistence. This provider has been discussed prior to, and at the Paris summit [2]. There is an implementation that is currently up for review [3], that was built off a POC. Based on the POC, there has been some performance analysis done with respect to the token formats available in Keystone (UUID, PKI, PKIZ, AE) [4].

The Keystone team spent some time discussing limitations of the current POC implementation at the mid-cycle. One case that still needs to be addressed (and is currently being worked), is federated tokens. When requesting unscoped federated tokens, the token contains unbound groups which would need to be carried in the token. This case can be handled by AE tokens but it would be possible for an unscoped federated AE token to exceed an acceptable AE token length (i.e. < 255 characters). Long story short, a federation migration could be used to ensure federated AE tokens never exceed a certain length.

Feel free to leave your comments on the AE Token spec.

Thanks!

Lance

[1] https://review.openstack.org/#/c/130050/
[2] https://etherpad.openstack.org/p/kilo-keystone-authorization
[3] https://review.openstack.org/#/c/145317/
[4] http://dolphm.com/benchmarking-openstack-keystone-token-formats/

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