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Expand on ACL issues

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Jake Howard 2024-02-21 11:46:18 +00:00
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docs/notes/infrastructure/cross-account-transfer.md → docs/notes/infrastructure/s3-cross-account-transfer.md
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@ -1,5 +1,5 @@
---
title: Cross-account data transfer
title: Cross-account data transfer in S3
tags:
- AWS
sources:
@ -49,11 +49,14 @@ To copy bucket contents from a bucket in account A to a bucket in account B:
Now, you can run `aws s3 sync` as the account in account B, and access both buckets.
!!! warning
Whilst it might seem counter-intuitive, a **pull**-based transfer is significantly simpler than a **push**-based transfer. Notably, it avoids [issues](https://stackoverflow.com/a/63804619) with ownership issues and ACLs.
## ACLs
These can be solved by overwriting the file's ACLs to enforce the bucket owner owns the file:
Whilst it might seem counter-intuitive, a **pull**-based transfer is significantly simpler than a **push**-based transfer. Notably, it avoids [issues](https://stackoverflow.com/a/63804619) with ownership issues and ACLs. Bucket policies don't seem to apply if the object is owned by a different account, which is the case when ACLs are enabled and the object is written by a user not in the organisation (hence pull-based being best).
```
aws s3 cp --recursive 's3://<destination_bucket>` 's3://<destination_bucket>` --acl bucket-owner-full-control --metadata-directive REPLACE
```
These can be solved by overwriting the file's ACLs to enforce the bucket owner owns the file:
```
aws s3 cp --recursive 's3://<destination_bucket>` 's3://<destination_bucket>` --acl bucket-owner-full-control --metadata-directive REPLACE
```
It's then good practice to make sure the ACLs are as you expect (eg [`./manage.py fix_document_acls`](https://github.com/torchbox/wagtail-storages?tab=readme-ov-file#django-admin-fix_document_acls)).