Steve Loughran commented on HADOOP-14556:

AWS extended Assume role lifespans from 1h to 12h in march. So starts to become 
possible to do something clever with a bucket issuing role credentials locked 
down to just that bucket and the matching DDB table, then we could have the FS 
issue that as some token.

Once HADOOP-15583 is in I'll revisit this, see if I can make it a plugin point 
and allow for something to generate restricted assumed role secrets. So if I 
try to access stevel ireland, it'd create some role with R/W/D access to that, 
the matching S3Guard DDB table and full KMS access, marshall that along with 
any encryption options and keys & so let you spark-submit with the credentials 
passed in *only* for the buckets you are working with. This can guarantee that 
queries sent to a cluster can't access any of the other AWS services to which a 
user has access to.

> S3A to support Delegation Tokens
> --------------------------------
>                 Key: HADOOP-14556
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14556
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 2.8.1
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-14556-001.patch, HADOOP-14556-002.patch
> S3A to support delegation tokens where
> * an authenticated client can request a token via 
> {{FileSystem.getDelegationToken()}}
> * Amazon's token service is used to request short-lived session secret & id; 
> these will be saved in the token and  marshalled with jobs
> * A new authentication provider will look for a token for the current user 
> and authenticate the user if found
> This will not support renewals; the lifespan of a token will be limited to 
> the initial duration. Also, as you can't request an STS token from a 
> temporary session, IAM instances won't be able to issue tokens.

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