+1
________________________________
From: oauth-boun...@ietf.org [mailto:oauth-boun...@ietf.org] On
Behalf Of Eran Hammer-Lahav
Sent: Tuesday, July 13, 2010 7:21 AM
To: Brian Eaton; OAuth WG; b...@google.com
Subject: Re: [OAUTH-WG] expired_token error code
I'm fine with this. Any objections?
EHL
On 7/12/10 11:01 PM, "Brian Eaton" <bea...@google.com> wrote:
http://tools.ietf.org/html/draft-ietf-oauth-v2-10#section-5.2.1
The "expired_token" error code doesn't scale well and
won't be
implemented reliably. It should be merged with
"invalid_token".
Suggested language:
invalid_token
The access token provided is invalid. Resource
servers
SHOULD use this error code when receiving a token which
is expired,
revoked, malformed, or invalid for other reasons. The
resource server
MUST respond with the HTTP 401 (Unauthorized) status
code. The client
MAY request a new access token and retry the protected
resource
request.
"expired_token" can't be implemented reliably for a few
reasons.
1) If you're using server-side storage of tokens (which
you need to do
if you want to keep your tokens very short...) you have
to throw away
tokens after they expire. Just because you can't
validate the token
doesn't mean the client can't refresh the token.
2) If you're using cryptographic access tokens, you need
to throw away
your old token signing keys at some point. Again, just
because you
can't validate a token doesn't mean the client can't
refresh the
token.
3) One common deployment model will have limited
communication between
authorization servers and protected resource servers.
The protected
resource server might not be able to contact the
authorization server
to figure out whether refresh tokens are available or
not.
4) The access token may not have enough information in
it to look-up
the corresponding refresh token and see if it's still
valid.
Remembering that information requires extra space in the
access token
for cryptographic token implementations. Space is
tight.
Cheers,
Brian
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