File Gateway Share with valid_user_list Groups

Question

Hello,
when trying to limit an Active Directory Share to some users groups, it doesn't work.
my tests:
- limit access to a single user DOMAIN\user --> ok
- limit access to a single group DOMAIN\group -> ko
when valid_user_list parameter is set, an authentication popup is launch during share access.

It's like FileGateway can't validate my user group membership.

File Gateway is domain integrated
AD domain level 2016
smb acl are disabled

any ideas?

Thanks for you help

Best regards

Harshi · Accepted Answer

Hello,

Groups must be prefixed with the @ character. Acceptable formats include: DOMAIN\User1, user1, @group1, and @DOMAIN\group1.

Try updating accordingly and test.

Ref - https://docs.aws.amazon.com/filegateway/latest/files3/enable-ad-settings.html

Thank you

Harshi · Answer

When a File Share is created the default user permission, groups is everyone. Any user with the UNC path to do the mapping will succeed as long as the user is a part of the same AD as that of the Gateway.  When you check the NTFS permissions of the share mapped to a windows machine the default is Everyone Full Control.

[File Share access](https://docs.aws.amazon.com/filegateway/latest/files3/enable-ad-settings.html) permissions take precedence over Windows NTFS permissions. When Allowed and Denied Users and Groups lists is configured at the file share, then Windows ACLs will not grant any access that overrides those lists. The Allowed and Denied Users and Groups lists are evaluated before ACLs, and control which users can mount or access the file share. If any users or groups are placed on the Allowed list, the list is considered active, and only those users can mount the file share.

The behavior you have experienced is expected (popup for valid user password) if the User that is trying to access the share is not in the valid user/group configured on the file share.

To further explain, for example, you have two users, ```User1``` and ```User2```. If ```User1``` is added as allowed user through File Share access settings via the Storage Gateway console. And if ```User2``` tries to map/access the file share, it will not succeed even if in NTFS permissions Everyone is Full Control.

For User2 to map/access the share successfully, it will be prompted to enter the password of ```User1``` to mount the share.  Or ```User2``` either needs to be allowed as a valid user on the file share or need to allow any domain group that ```User2``` is part of for it to mount the share successfully.

Additional Ref:

1. https://docs.aws.amazon.com/filegateway/latest/files3/using-smb-fileshare.html
2. https://docs.aws.amazon.com/filegateway/latest/files3/edit-file-share-access-smb.html

Thank You

File Gateway Share with valid_user_list Groups

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