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diff --git a/doc/radosgw/swift/tempurl.rst b/doc/radosgw/swift/tempurl.rst new file mode 100644 index 00000000..79b392de --- /dev/null +++ b/doc/radosgw/swift/tempurl.rst @@ -0,0 +1,102 @@ +==================== + Temp URL Operations +==================== + +To allow temporary access (for eg for `GET` requests) to objects +without the need to share credentials, temp url functionality is +supported by swift endpoint of radosgw. For this functionality, +initially the value of `X-Account-Meta-Temp-URL-Key` and optionally +`X-Account-Meta-Temp-URL-Key-2` should be set. The Temp URL +functionality relies on a HMAC-SHA1 signature against these secret +keys. + +.. note:: If you are planning to expose Temp URL functionality for the + Swift API, it is strongly recommended to include the Swift + account name in the endpoint definition, so as to most + closely emulate the behavior of native OpenStack Swift. To + do so, set the ``ceph.conf`` configuration option ``rgw + swift account in url = true``, and update your Keystone + endpoint to the URL suffix ``/v1/AUTH_%(tenant_id)s`` + (instead of just ``/v1``). + + +POST Temp-URL Keys +================== + +A ``POST`` request to the Swift account with the required key will set +the secret temp URL key for the account, against which temporary URL +access can be provided to accounts. Up to two keys are supported, and +signatures are checked against both the keys, if present, so that keys +can be rotated without invalidating the temporary URLs. + +.. note:: Native OpenStack Swift also supports the option to set + temporary URL keys at the container level, issuing a + ``POST`` or ``PUT`` request against a container that sets + ``X-Container-Meta-Temp-URL-Key`` or + ``X-Container-Meta-Temp-URL-Key-2``. This functionality is + not supported in radosgw; temporary URL keys can only be set + and used at the account level. + +Syntax +~~~~~~ + +:: + + POST /{api version}/{account} HTTP/1.1 + Host: {fqdn} + X-Auth-Token: {auth-token} + +Request Headers +~~~~~~~~~~~~~~~ + +``X-Account-Meta-Temp-URL-Key`` + +:Description: A user-defined key that takes an arbitrary string value. +:Type: String +:Required: Yes + +``X-Account-Meta-Temp-URL-Key-2`` + +:Description: A user-defined key that takes an arbitrary string value. +:Type: String +:Required: No + + +GET Temp-URL Objects +==================== + +Temporary URL uses a cryptographic HMAC-SHA1 signature, which includes +the following elements: + +#. The value of the Request method, "GET" for instance +#. The expiry time, in format of seconds since the epoch, ie Unix time +#. The request path starting from "v1" onwards + +The above items are normalized with newlines appended between them, +and a HMAC is generated using the SHA-1 hashing algorithm against one +of the Temp URL Keys posted earlier. + +A sample python script to demonstrate the above is given below: + + +.. code-block:: python + + import hmac + from hashlib import sha1 + from time import time + + method = 'GET' + host = 'https://objectstore.example.com/swift' + duration_in_seconds = 300 # Duration for which the url is valid + expires = int(time() + duration_in_seconds) + path = '/v1/your-bucket/your-object' + key = 'secret' + hmac_body = '%s\n%s\n%s' % (method, expires, path) + sig = hmac.new(key, hmac_body, sha1).hexdigest() + rest_uri = "{host}{path}?temp_url_sig={sig}&temp_url_expires={expires}".format( + host=host, path=path, sig=sig, expires=expires) + print rest_uri + + # Example Output + # https://objectstore.example.com/swift/v1/your-bucket/your-object?temp_url_sig=ff4657876227fc6025f04fcf1e82818266d022c6&temp_url_expires=1423200992 + |