[Bug 1847544] Re: backport: S3 policy evaluated incorrectly

[gerald.yang]

** Description changed:

- ## DRAFT ##
+ [Impact]
+ If a user tries to access a non-existent bucket, it should get a 'NoSuchBucket' error message (404)
+ But if there is such a bucket which is belonged to another user, radosgw will return 'AccessDenied' error (403)
+ This is an incorrect error message, radosgw should return 404
  
- [Impact]
  
  [Test Case]
+ Create a user by radosgw-admin, then create a bucket through S3 by this user
+ Create another user and try to access the bucket created by the above user
+ The error message must be 'NoSuchBucket', not 'AccessDenied'
  
  [Regression Potential]
+ Low
  
- [Other Info]
- 
- [Original Description]
+ [Other Information]
  Backport Ceph issue 38638 to Luminous.
  
  If a user different from the owner (or even an anonymous user) does a
  GetObject/HeadObject on a non existing object, Radosgw returns status
  code 403, rather than the correct status 404.
  
  A version of this was merged into Ceph master:
  https://tracker.ceph.com/issues/38638
  https://github.com/ceph/ceph/commit/5eb50b7d10da51db72f705807c87775562b79b63
  
- And backported (acceptance pending):
+ And backported to luminous has been accepted:
  https://tracker.ceph.com/issues/39272
  https://github.com/ceph/ceph/commit/a752b21f549cc83745e35324387b85b3d039dfd2

** Tags added: sts-sru-needed

** Also affects: ceph (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: ceph (Ubuntu Bionic)
     Assignee: (unassigned) => gerald.yang (gerald-yang-tw)

** Changed in: ceph (Ubuntu Bionic)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1847544

Title:
  backport: S3 policy evaluated incorrectly

Status in ceph package in Ubuntu:
  In Progress
Status in ceph source package in Bionic:
  In Progress

Bug description:
  [Impact]
  If a user tries to access a non-existent bucket, it should get a 'NoSuchBucket' error message (404)
  But if there is such a bucket which is belonged to another user, radosgw will return 'AccessDenied' error (403)
  This is an incorrect error message, radosgw should return 404

  
  [Test Case]
  Create a user by radosgw-admin, then create a bucket through S3 by this user
  Create another user and try to access the bucket created by the above user
  The error message must be 'NoSuchBucket', not 'AccessDenied'

  [Regression Potential]
  Low

  [Other Information]
  Backport Ceph issue 38638 to Luminous.

  If a user different from the owner (or even an anonymous user) does a
  GetObject/HeadObject on a non existing object, Radosgw returns status
  code 403, rather than the correct status 404.

  A version of this was merged into Ceph master:
  https://tracker.ceph.com/issues/38638
  https://github.com/ceph/ceph/commit/5eb50b7d10da51db72f705807c87775562b79b63

  And backported to luminous has been accepted:
  https://tracker.ceph.com/issues/39272
  https://github.com/ceph/ceph/commit/a752b21f549cc83745e35324387b85b3d039dfd2

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