mirror of
https://github.com/ceph/ceph
synced 2024-12-14 23:46:28 +00:00
76 lines
3.8 KiB
ReStructuredText
76 lines
3.8 KiB
ReStructuredText
=========================
|
|
Authentication and ACLs
|
|
=========================
|
|
|
|
Requests to the RADOS Gateway (RGW) can be either authenticated or
|
|
unauthenticated. RGW assumes unauthenticated requests are sent by an anonymous
|
|
user. RGW supports canned ACLs.
|
|
|
|
Authentication
|
|
--------------
|
|
Authenticating a request requires including an access key and a Hash-based
|
|
Message Authentication Code (HMAC) in the request before it is sent to the
|
|
RGW server. RGW uses an S3-compatible authentication approach.
|
|
|
|
::
|
|
|
|
HTTP/1.1
|
|
PUT /buckets/bucket/object.mpeg
|
|
Host: cname.domain.com
|
|
Date: Mon, 2 Jan 2012 00:01:01 +0000
|
|
Content-Encoding: mpeg
|
|
Content-Length: 9999999
|
|
|
|
Authorization: AWS {access-key}:{hash-of-header-and-secret}
|
|
|
|
In the foregoing example, replace ``{access-key}`` with the value for your access
|
|
key ID followed by a colon (``:``). Replace ``{hash-of-header-and-secret}`` with
|
|
a hash of the header string and the secret corresponding to the access key ID.
|
|
|
|
To generate the hash of the header string and secret, you must:
|
|
|
|
#. Get the value of the header string.
|
|
#. Normalize the request header string into canonical form.
|
|
#. Generate an HMAC using a SHA-1 hashing algorithm.
|
|
See `RFC 2104`_ and `HMAC`_ for details.
|
|
#. Encode the ``hmac`` result as base-64.
|
|
|
|
To normalize the header into canonical form:
|
|
|
|
#. Get all fields beginning with ``x-amz-``.
|
|
#. Ensure that the fields are all lowercase.
|
|
#. Sort the fields lexicographically.
|
|
#. Combine multiple instances of the same field name into a
|
|
single field and separate the field values with a comma.
|
|
#. Replace white space and line breaks in field values with a single space.
|
|
#. Remove white space before and after colons.
|
|
#. Append a new line after each field.
|
|
#. Merge the fields back into the header.
|
|
|
|
Replace the ``{hash-of-header-and-secret}`` with the base-64 encoded HMAC string.
|
|
|
|
Access Control Lists (ACLs)
|
|
---------------------------
|
|
|
|
RGW supports S3-compatible ACL functionality. An ACL is a list of access grants
|
|
that specify which operations a user can perform on a bucket or on an object.
|
|
Each grant has a different meaning when applied to a bucket versus applied to
|
|
an object:
|
|
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
| Permission | Bucket | Object |
|
|
+==================+========================================================+==============================================+
|
|
| ``READ`` | Grantee can list the objects in the bucket. | Grantee can read the object. |
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
| ``WRITE`` | Grantee can write or delete objects in the bucket. | N/A |
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
| ``READ_ACP`` | Grantee can read bucket ACL. | Grantee can read the object ACL. |
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
| ``WRITE_ACP`` | Grantee can write bucket ACL. | Grantee can write to the object ACL. |
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
| ``FULL_CONTROL`` | Grantee has full permissions for object in the bucket. | Grantee can read or write to the object ACL. |
|
|
+------------------+--------------------------------------------------------+----------------------------------------------+
|
|
|
|
.. _RFC 2104: http://www.ietf.org/rfc/rfc2104.txt
|
|
.. _HMAC: http://en.wikipedia.org/wiki/HMAC
|