Hi Benno,
If for example you had a TDS running, there is standard middleware for ESG that
you could front it with to secure it. If you also had a portal for users to
sign in to you would almost certainly have a MyProxy server configured too.
Probably best if I pass on more details off list…
Phil
From: Benno Blumenthal <benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx>>
Date: Mon, 14 Mar 2011 15:12:59 -0400
To: Philip Kershaw <philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx>>
Cc: <thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx>>,
<caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx>>
Subject: Re: [thredds] Proposal for handling authorization credentials in
thredds....
The shortness of the OAuth chain worried me, it is nice to know there is an
alternative.
Could you let me know when your proof-of-concept project works? Or even
before then, once it is clear what a third-party data processor needs to do in
order to implement access ? As a third party, am I running a MyProxy service,
or merely using it? Needless to say, I do not yet get it.
Benno
On Mon, Mar 14, 2011 at 11:53 AM,
<philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx>> wrote:
Hi Benno,
I was hoping there were others who had been doing work with OAuth! :)
The WMS client mentioned in the presentation did indeed share the same domain
as the WMS. It worked but obviously not a satisfactory solution for accessing
secured services across multiple sites. I'm working on a short proof of
concept project now where we are using the 'classic' Grid-based solution for
delegation with proxy certificates. The ESGF security model already supports
authentication with PKI credentials – standard X.509 certificates. It's a
small change to enable support for proxy certificates and thus enable full
delegation capability.
The scenario is, a user signs in at a portal with OpenID. A special MyProxy
service is then used to do a credential translation from the OpenID to PKI
based credentials. The portal can use these on the behalf of the user to
access other ESGF-security aware services be they WMS or OPeNDAP based. With
proxy certificates you can have a longer chain: the portal calls a WPS which
executes a job which itself retrieves data from secured OPeNDAP services.
OAuth could be a viable alternative but for the moment proxy certificates have
the most straightforward approach.
Cheers,
Phil
From: Benno Blumenthal
<benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx><mailto:benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx>>>
Date: Mon, 14 Mar 2011 10:37:33 -0400
To: Philip Kershaw
<philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx><mailto:philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx>>>
Cc:
<thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx><mailto:thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx>>>,
<caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx><mailto:caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx>>>
Subject: Re: [thredds] Proposal for handling authorization credentials in
thredds....
Hi Phil, John,
As I was about to tell John, this is all triggered by the work Phil is doing,
namely
http://www.allhands.org.uk/2009/09/Kershaw89AccessControlForCMIP5PhilipKershaw.pdf
and Phil is definitely the one to talk to.
My immediate problem is that in CMIP3 there was a THREDDS/OPendap service of
aggregated datasets,
http://esgcet.llnl.gov/dap/ipcc4/?thredds
which my opendap web client converts to a set of webpages that allows analysis
of the data
http://iridl.ldeo.columbia.edu/SOURCES/.WCRP/.CMIP3/
Because security is Basic Authentication, my client uses the security on the
original data to protect the derived pages/analyses, i.e. userids/passwords are
from the original site, not my web server.
CMIP5 is a different story, because if/when it becomes available as a
THREDDS/Opendap service, it will be protected by OpenID (near as I can tell
from the outside, anyway). My understanding is that this requires something
like MyProxy for standalone opendap clients. OpenID works for a browser
directly interacting with a CMIP5 Federation server, but my understanding is
that, in order for a third party (like my opendap web client) to access the
data, something more is required. My efforts to understand the implications of
what Phil has done lead me to see that OAuth is designed to solve that
three-legged problem -- how well, remains to be seen.
So Phil, It seems to me that already you have a WMS client accessing the CMIP5
data, but my guess is that that client is within the same openid security as
the data. If you separated the WMS client and the data server into different
security domains, then you would have the three-legged problem that I have,
i.e. your WMS server accessing data on another machine in the federation. Is
that what you were referring to?
So yes, I am working on OAuth, but what you are doing is crucial (and it is all
your doing, anyway). It does not seem like much of a change for you to handle
OAuth -- it is a longer, three-way conversation with a series of tokens along
the way, but it ends up with a AuthorizedAcessToken to access the data, which
must be about the same as what you have already done. But maybe you have done
that already for WMS?
Benno
On Mon, Mar 14, 2011 at 4:04 AM,
<philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx><mailto:philip.kershaw@xxxxxxxxxx<mailto:philip.kershaw@xxxxxxxxxx>>>
wrote:
Hi Benno,
I'd be very interested to hear if you've done work with OAuth too.
I've looked at it for a particular project recently but this option hasn't got
past the design stage, instead we are going for a solution using proxy
certificates. Interesting what you say about discovery. That's something that
really has to be resolved.
For Earth System Grid we have leveraged OpenID to enable discovery of
additional Identity Provider services via the XRDS document retrieved with
Yadis: when you HTTP GET the user's OpenID URL it returns an XRDS document
containing a list of service endpoints. It doesn't help in the OAuth scenario
though as far as I can see because you want to discover services at the
resource being protected.
There was also work with OpenID/OAuth in a recent OGC interoperability
experiment.
Phil
From: John Caron
<caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx><mailto:caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx>><mailto:caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx><mailto:caron@xxxxxxxxxxxxxxxx<mailto:caron@xxxxxxxxxxxxxxxx>>>>
Date: Sat, 12 Mar 2011 07:01:05 -0700
To:
<thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx><mailto:thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx>><mailto:thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx><mailto:thredds@xxxxxxxxxxxxxxxx<mailto:thredds@xxxxxxxxxxxxxxxx>>>>
Subject: Re: [thredds] Proposal for handling authorization credentials in
thredds....
thanks Benno, we'll check out OAuth. are you currently implementing it?
On 3/10/2011<tel:3%2F10%2F2011><tel:3%2F10%2F2011> 3:23 PM, Benno Blumenthal
wrote:
I am pretty sure the essential scheme is OAuth -- authorizing a third party to
access data on the user's behalf -- though the primary implementation would be
OpenID with OAuth extensions. Unfortunately OAuth 2.0 is still being hammered
out, so we are stuck with OAuth 1.0, which does not have any real discovery in
it, i.e. you cannot figure out from the denial what to do, but that will get
fixed in 2.0. At least, they are arguing about it. But at least you (we) can
get the pieces into place.
Benno
On Thu, Mar 10, 2011 at 4:53 PM, Dennis Heimbigner
<dmh@xxxxxxxxxxxxxxxx<mailto:dmh@xxxxxxxxxxxxxxxx><mailto:dmh@xxxxxxxxxxxxxxxx<mailto:dmh@xxxxxxxxxxxxxxxx>><mailto:dmh@xxxxxxxxxxxxxxxx<mailto:dmh@xxxxxxxxxxxxxxxx><mailto:dmh@xxxxxxxxxxxxxxxx<mailto:dmh@xxxxxxxxxxxxxxxx>>>>
wrote:
I am in the process of refactoring the
remote data access functionality for
thredds. This currently will affect
opendap, but others may occur in the future.
My goal for this initial message is to solicit
comments about the following proposal to make
sure I am not missing any. Please post comments
on this newsgroup or send them directly to me
(dmh@xxxxxxxx<mailto:dmh@xxxxxxxx><mailto:dmh@xxxxxxxx<mailto:dmh@xxxxxxxx>><mailto:dmh@xxxxxxxx<mailto:dmh@xxxxxxxx><mailto:dmh@xxxxxxxx<mailto:dmh@xxxxxxxx>>>).
Additionally, I do not have access to
servers that use the auth mechanisms
listed below. I have ESG, but not the others.
If you are game, and can provide me with an
account on your server, so I can do testing,
it would be much appreciated.
=Dennis Heimbigner
Unidata
------------------------------
Proposal:
The primary issue here is providing various kinds of authorization
credentials (broadly construed) to servers by clients.
Currently, I have identified the following scenarios that must be
supported (pardon me if I am a bit loose with terminology).
1. client-side credentials:
- basic password credentials
- java keystore for ESG credentials
- OPEN-ID credentials (probably restricted
to web-browser access only).
2. server-side credentials support:
- currently basic and keystore are already supported
in apache httpclient-3.
- OPEN-ID support will require additional server-side code.
3. Proxy support
- providing password access to get through proxies.
There is an additional factor. It is desirable to support both "global"
and "dynamic" credentialing.
Global - this means that a single set of credentials is set globally and
is adequate for all code running within a single program
(i.e. linux or windows process).
Dynamic - this means that each connection to a server may have a
separate set of credentials. Further, it must be guaranteed
that no connection is re-used to avoid inadvertent access to
some other set of credentials.
My refactoring involves the following changes:
1. wrap the HttpClient class within a new class called HTTPSession to
give better control over the parameters for the HttpClient objects.
Methods are also wrapped using an HTTPMethod class.
2. Remove all static HttpClient (HTTPSession) class variables. This so
far is affecting NetcdfDataset.java, HttpClientManager.java
HTTPRandomAccessFile.java, and NetcdfFile.java.
3. Modify the api's of the above classes to provide an extra parameter
to pass in authorization information. The authorization information
is passed using an instance of the HttpConnectionParams class so that
it can hold arbitrary (key,value) pairs.
4. The authorization information is passed along ultimately into where
it is needed, namely the HTTPSession object, the HTTPMethod object
and into the SSLProtocolFactory.
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International Research Institute for climate and society
The Earth Institute at Columbia University
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Dr. M. Benno Blumenthal
benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx><mailto:benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx>>
International Research Institute for climate and society
The Earth Institute at Columbia University
Lamont Campus, Palisades NY 10964-8000 (845)
680-4450<tel:%28845%29%20680-4450>
--
Scanned by iCritical.
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Dr. M. Benno Blumenthal
benno@xxxxxxxxxxxxxxxx<mailto:benno@xxxxxxxxxxxxxxxx>
International Research Institute for climate and society
The Earth Institute at Columbia University
Lamont Campus, Palisades NY 10964-8000 (845) 680-4450
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