PublicAccessBlock: test access deny via bucket policy

Make sure 403 is returned when access is denied via s3:GetBucketPublicAccessBlock action on GetBucketPublicAccessBlock

Refs: ceph/ceph#55652
Signed-off-by: Seena Fallah <seenafallah@gmail.com>
(cherry picked from commit 3af4231)

s3tests_boto3/functional/policy.py

@@ -37,10 +37,10 @@ def to_json(self):
 
         return json.dumps(policy_dict)
 
-def make_json_policy(action, resource, principal={"AWS": "*"}, conditions=None):
+def make_json_policy(action, resource, principal={"AWS": "*"}, effect="Allow", conditions=None):
     """
     Helper function to make single statement policies
     """
-    s = Statement(action, resource, principal, condition=conditions)
+    s = Statement(action, resource, principal, effect=effect, condition=conditions)
     p = Policy()
     return p.add_statement(s).to_json()

s3tests_boto3/functional/test_s3.py

@@ -12607,6 +12607,34 @@ def test_get_undefined_public_block():
 
     assert response_code == 'NoSuchPublicAccessBlockConfiguration'
 
+def test_get_public_block_deny_bucket_policy():
+    bucket_name = get_new_bucket()
+    client = get_client()
+
+    access_conf = {'BlockPublicAcls': True,
+                   'IgnorePublicAcls': True,
+                   'BlockPublicPolicy': True,
+                   'RestrictPublicBuckets': False}
+    client.put_public_access_block(Bucket=bucket_name, PublicAccessBlockConfiguration=access_conf)
+
+    # make sure we can get the public access block
+    resp = client.get_public_access_block(Bucket=bucket_name)
+    assert resp['PublicAccessBlockConfiguration']['BlockPublicAcls'] == access_conf['BlockPublicAcls']
+    assert resp['PublicAccessBlockConfiguration']['BlockPublicPolicy'] == access_conf['BlockPublicPolicy']
+    assert resp['PublicAccessBlockConfiguration']['IgnorePublicAcls'] == access_conf['IgnorePublicAcls']
+    assert resp['PublicAccessBlockConfiguration']['RestrictPublicBuckets'] == access_conf['RestrictPublicBuckets']
+
+    # make bucket policy to deny access
+    resource = _make_arn_resource(bucket_name)
+    policy_document = make_json_policy("s3:GetBucketPublicAccessBlock",
+                                       resource, effect="Deny")
+    client.put_bucket_policy(Bucket=bucket_name, Policy=policy_document)
+
+    # check if the access is denied
+    e = assert_raises(ClientError, client.get_public_access_block, Bucket=bucket_name)
+    status, error_code = _get_status_and_error_code(e.response)
+    assert status == 403
+
 def test_put_public_block():
     #client = get_svc_client(svc='s3control', client_config=Config(s3={'addressing_style': 'path'}))
     bucket_name = get_new_bucket()