131 lines
4.8 KiB
Python
131 lines
4.8 KiB
Python
# Copyright (c) 2010-2014 OpenStack Foundation.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from swift.common.http import HTTP_OK
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from swift.common.middleware.acl import parse_acl, referrer_allowed
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from swift.common.utils import public
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from swift.common.middleware.s3api.exception import ACLError
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from swift.common.middleware.s3api.controllers.base import Controller
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from swift.common.middleware.s3api.s3response import HTTPOk, S3NotImplemented, \
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MalformedACLError, UnexpectedContent, MissingSecurityHeader
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from swift.common.middleware.s3api.etree import Element, SubElement, tostring
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from swift.common.middleware.s3api.acl_utils import swift_acl_translate, \
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XMLNS_XSI
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MAX_ACL_BODY_SIZE = 200 * 1024
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def get_acl(account_name, headers):
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"""
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Attempts to construct an S3 ACL based on what is found in the swift headers
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"""
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elem = Element('AccessControlPolicy')
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owner = SubElement(elem, 'Owner')
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SubElement(owner, 'ID').text = account_name
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SubElement(owner, 'DisplayName').text = account_name
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access_control_list = SubElement(elem, 'AccessControlList')
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# grant FULL_CONTROL to myself by default
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grant = SubElement(access_control_list, 'Grant')
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grantee = SubElement(grant, 'Grantee', nsmap={'xsi': XMLNS_XSI})
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grantee.set('{%s}type' % XMLNS_XSI, 'CanonicalUser')
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SubElement(grantee, 'ID').text = account_name
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SubElement(grantee, 'DisplayName').text = account_name
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SubElement(grant, 'Permission').text = 'FULL_CONTROL'
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referrers, _ = parse_acl(headers.get('x-container-read'))
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if referrer_allowed('unknown', referrers):
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# grant public-read access
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grant = SubElement(access_control_list, 'Grant')
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grantee = SubElement(grant, 'Grantee', nsmap={'xsi': XMLNS_XSI})
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grantee.set('{%s}type' % XMLNS_XSI, 'Group')
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SubElement(grantee, 'URI').text = \
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'http://acs.amazonaws.com/groups/global/AllUsers'
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SubElement(grant, 'Permission').text = 'READ'
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referrers, _ = parse_acl(headers.get('x-container-write'))
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if referrer_allowed('unknown', referrers):
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# grant public-write access
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grant = SubElement(access_control_list, 'Grant')
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grantee = SubElement(grant, 'Grantee', nsmap={'xsi': XMLNS_XSI})
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grantee.set('{%s}type' % XMLNS_XSI, 'Group')
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SubElement(grantee, 'URI').text = \
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'http://acs.amazonaws.com/groups/global/AllUsers'
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SubElement(grant, 'Permission').text = 'WRITE'
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body = tostring(elem)
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return HTTPOk(body=body, content_type="text/plain")
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class AclController(Controller):
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"""
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Handles the following APIs:
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* GET Bucket acl
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* PUT Bucket acl
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* GET Object acl
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* PUT Object acl
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Those APIs are logged as ACL operations in the S3 server log.
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"""
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@public
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def GET(self, req):
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"""
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Handles GET Bucket acl and GET Object acl.
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"""
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resp = req.get_response(self.app, method='HEAD')
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return get_acl(req.user_id, resp.headers)
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@public
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def PUT(self, req):
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"""
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Handles PUT Bucket acl and PUT Object acl.
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"""
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if req.is_object_request:
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# Handle Object ACL
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raise S3NotImplemented()
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else:
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# Handle Bucket ACL
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xml = req.xml(MAX_ACL_BODY_SIZE)
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if all(['HTTP_X_AMZ_ACL' in req.environ, xml]):
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# S3 doesn't allow to give ACL with both ACL header and body.
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raise UnexpectedContent()
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elif not any(['HTTP_X_AMZ_ACL' in req.environ, xml]):
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# Both canned ACL header and xml body are missing
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raise MissingSecurityHeader(missing_header_name='x-amz-acl')
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else:
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# correct ACL exists in the request
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if xml:
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# We very likely have an XML-based ACL request.
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# let's try to translate to the request header
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try:
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translated_acl = swift_acl_translate(xml, xml=True)
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except ACLError:
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raise MalformedACLError()
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for header, acl in translated_acl:
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req.headers[header] = acl
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resp = req.get_response(self.app, 'POST')
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resp.status = HTTP_OK
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resp.headers.update({'Location': req.container_name})
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return resp
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