iam: test bucket policy principal for iam user with path

Signed-off-by: Casey Bodley <cbodley@redhat.com>

s3tests_boto3/functional/test_iam.py

@@ -1,5 +1,6 @@
 import json
 import datetime
+import time
 
 from botocore.exceptions import ClientError
 import pytest
@@ -1276,3 +1277,59 @@ def test_account_user_access_key_list(iam_root):
     keys = sorted([id1, id2])
     assert keys == sorted(user_list_key_ids(iam_root, UserName=name))
     assert keys == sorted(user_list_key_ids(iam_root, UserName=name, PaginationConfig={'PageSize': 1}))
+
+def retry_on(code, tries, func, *args, **kwargs):
+    for i in range(tries):
+        try:
+            return func(*args, **kwargs)
+        except ClientError as e:
+            err = e.response['Error']['Code']
+            if i + 1 < tries and err in code:
+                print(f'Got {err}, retrying in {i}s..')
+                time.sleep(i)
+                continue
+            raise
+
+
+@pytest.mark.iam_account
+@pytest.mark.iam_user
+def test_account_user_bucket_policy_allow(iam_root):
+    path = get_iam_path_prefix()
+    name = make_iam_name('name')
+    response = iam_root.create_user(UserName=name, Path=path)
+    user_arn = response['User']['Arn']
+    assert user_arn.startswith('arn:aws:iam:')
+    assert user_arn.endswith(f':user{path}{name}')
+
+    key = iam_root.create_access_key(UserName=name)['AccessKey']
+    client = get_iam_s3client(aws_access_key_id=key['AccessKeyId'],
+                              aws_secret_access_key=key['SecretAccessKey'])
+
+    # create a bucket with the root user
+    roots3 = get_iam_root_client(service_name='s3')
+    bucket = get_new_bucket(roots3)
+    try:
+        # the access key may take a bit to start working. retry until it returns
+        # something other than InvalidAccessKeyId
+        e = assert_raises(ClientError, retry_on, 'InvalidAccessKeyId', 10, client.list_objects, Bucket=bucket)
+        # expect AccessDenied because no identity policy allows s3 actions
+        status, error_code = _get_status_and_error_code(e.response)
+        assert status == 403
+        assert error_code == 'AccessDenied'
+
+        # add a bucket policy that allows s3:ListBucket for the iam user's arn
+        policy = json.dumps({
+            'Version': '2012-10-17',
+            'Statement': [{
+                'Effect': 'Allow',
+                'Principal': {'AWS': user_arn},
+                'Action': 's3:ListBucket',
+                'Resource': f'arn:aws:s3:::{bucket}'
+                }]
+            })
+        roots3.put_bucket_policy(Bucket=bucket, Policy=policy)
+
+        # verify that the iam user can eventually access it
+        retry_on('AccessDenied', 10, client.list_objects, Bucket=bucket)
+    finally:
+        roots3.delete_bucket(Bucket=bucket)