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From Amila Jayasekara <>
Subject Re: Handling security context in airavata
Date Tue, 12 Feb 2013 18:46:33 GMT
Hi Raminder,

More answers inline.


On Tue, Feb 12, 2013 at 11:28 AM, Raminder Singh
<> wrote:
> Thanks Amila for describing it well. Are you planning to create the security context
per workflow(Workflow interpreter level) or per workflow application(GFAC API level)? Difference
is, GFAC knows the type of application and can create/request a particular credential as needed
fill it into the conext. Then context can be shared between input/output chain and provider.
Workflow interpreter does not know anything about the type of service and need to fill all
the different credentials into context before invoking any application and one of them will
be left unused. I thing having a single security object per application is required. I can
think about cases where user want to transfer gridftp files to EC2 provider but i dont think
we are addressing that problem yet.  Problems of having multiple security in the context will
make the context object bulky and lot of time object will be not used.

I would say a security context for each invocation. I am not sure
whether you meant the same thing by saying "per application". If not
please describe.

> How do you expect users to send security information (Format)? Means if i have workflow
with Grid and EC2 service, i need to call some API functions to set both with different object
types. How do you think this to work for non java clients?

Before invoking the WF (Workflow) credentials should be in ACS
(Airavata Credential Store). At the time of storing credentials to
ACS, user need to specify a name. This name is unique to a gateway.
Then afterwards when user invokes workflow he/she needs to send
"credential user names" as a list.

> Do you have ETA on  OA4MP service to renew proxy automatically?

No, I dont have. We may need to check with OA4MP debs how to achieve
this. Also we need to check how to renew credentials for other types
of providers. (Mainly IaaS ones)


That would be much needed for production gateways to use OAUTH credentials.
> Thanks
> Raminder
>> Hi All,
>> We had an offline discussion about handling security contexts at GFac
>> level. Some of the ideas discussed are as follows,
>> 1. In the new GFac handler architecture we can set a security context.
>> This security context is used through out handler executions. We need
>> to populate security credentials retrieved from ACS (Airavata
>> Credential Store) to the security context. But we need to make sure
>> the populated security context will work for all providers (E.g :-
>> XSEDE, EC 2, Local Cluster etc ...).
>> So we thought of storing credentials in a generic object within the
>> security context and allow provider implementation to convert
>> credentials to correct object type (Keys, Tokens etc ...).
>> 2. We also discussed about how to handle security when there are
>> multiple providers per request. E.g :- for a single request we may
>> need to transfer files between 2 GRID providers. Maybe from EC2 to
>> XSEDE. To handle such scenario we need to have more than one security
>> credentials in the security context. Inorder to support this use case
>> we can pass more than one community user names in the request.
>> 3. Another concern that arose during the chat was about renewing
>> credentials. As per now OA4MP (OAuth for My Proxy) does not support
>> credential renewing. This might have an impact on current deployments
>> once 0.7 is released. I guess the ideal solution would be to have
>> credential renewing at OA4MP side. Until we have that feature in OA4MP
>> we can use a configuration file to read my proxy data. (As we do now).
>> So if "credential store" credentials are expired or not available we
>> will use configured default my proxy security data.
>> Also it was proposed to store encrypted user name/passwords in ACS in
>> addition to SSH keys and myproxy keys.
>> Appreciate your feedback on above suggestions.
>> Thank you
>> Regards,
>> Amila

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