[rgw] the swift key remains after removing a subuser

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Hi Yehuda,

I believe you noticed this issue (http://tracker.ceph.com/issues/12890) as you changed the priority to high. I need your help about the following related questions:
1. When removing a subuser, is it okay to set '--purge-keys' as the default option?
If we do so, there is no way to keep the keys since we don't have options like --keep-keys. IMO that is acceptable, but I'm not sure if there exist some scenarios that users want to just delete a subuser but preserve its keys.

2. Do we need to purge both S3 keys and swift keys at the same time?
Though ceph documents claim that subuser is designed for swift API, it is allowed to create s3 access-secret key pairs for subusers, and they can be used through s3 interface without any problem. Moreover, when creating a subuser with the command 'radosgw-admin subuser create --uid=test --subuser=test:sub', ceph would by default create an s3 key pair for the subuser. Thus, if we do want to purge keys, I think it is necessary to check both s3 and swift keys and delete all associate entries.

3. Do we need to prevent a subuser without any permission from obtaining the account information?
Currently a subuser with permission <none> can get some of the account metadata and its bucket list. The following shows a part of my testing result:
        sandy@ceph20:~$ curl -i $url -X GET -H "X-Auth-Token: $token"
        HTTP/1.1 200 OK
        X-Timestamp: 1442367990.90740
        X-Account-Container-Count: 1
        X-Account-Object-Count: 2
        X-Account-Bytes-Used: 41943040
        X-Account-Bytes-Used-Actual: 41943040
        X-Trans-Id: ts-default.64171.86-20150916:014630:904
        Content-type: text/plain; charset=utf-8
        Content-Length: 9
        Date: Wed, 16 Sep 2015 01:46:30 GMT

        bkt_test


When doing the tests, I also encountered several other issues that I cannot tell whether are bugs or designed on purpose.
i1: As mentioned in question 2, a subuser is created with s3 keys rather than a swift key.
i2: The auto-generated s3 secret key is empty, and it is regarded as valid.
i3: The account metadata obtained from swift API contains doubled object count and bytes used. For a subuser possessing one container and one object, the results may look like this:
        sandy@ceph20:~$ curl -i $url -X GET -H "X-Auth-Token: $token2"
        HTTP/1.1 200 OK
        X-Timestamp: 1442371316.79489
        X-Account-Container-Count: 1
        X-Account-Object-Count: 2
        X-Account-Bytes-Used: 41943040
        X-Account-Bytes-Used-Actual: 41943040
        X-Trans-Id: ts-default.64171.99-20150916:024156:790
        Content-type: text/plain; charset=utf-8
        Content-Length: 9
        Date: Wed, 16 Sep 2015 02:41:56 GMT

        bkt_test

        sandy@ceph20:~$ curl -i $url/bkt_test -X GET -H "X-Auth-Token: $token2"
        HTTP/1.1 200 OK
        X-Timestamp: 1442280690.00000
        X-Container-Object-Count: 1
        X-Container-Bytes-Used: 20971520
        X-Container-Bytes-Used-Actual: 20971520
        X-Storage-Policy: default-placement
        X-Trans-Id: ts-default.64171.100-20150916:024200:482
        Content-Length: 9
        Accept-Ranges: bytes
        Content-type: text/plain; charset=utf-8
        Date: Wed, 16 Sep 2015 02:42:00 GMT

        file_test

As you can see, the container has only one object of 20M, but the account owns two objects of 40M in total. I checked the .rgw.buckets pool and it contains only one file:
        sandy@ceph20:~$ rados -p .rgw.buckets ls
        default.64171.1__shadow_.bSI8b1u0Wff4-2LuEDCYtYkqhpuqPAK_4
        default.64171.1__shadow_.bSI8b1u0Wff4-2LuEDCYtYkqhpuqPAK_1
        default.64171.1__shadow_.bSI8b1u0Wff4-2LuEDCYtYkqhpuqPAK_5
        default.64171.1__shadow_.bSI8b1u0Wff4-2LuEDCYtYkqhpuqPAK_3
        default.64171.1_file_test
        default.64171.1__shadow_.bSI8b1u0Wff4-2LuEDCYtYkqhpuqPAK_2


Your comments and suggestions would be sincerely appreciated, thank you.

-----
Best regards,
Sangdi
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