# GCP - Storage Post Exploitation

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## Cloud Storage

For more information about CLoud Storage check this page:

{% content-ref url="../gcp-services/gcp-storage-enum.md" %}
[gcp-storage-enum.md](../gcp-services/gcp-storage-enum.md)
{% endcontent-ref %}

### Give Public Access

It's possible to give external users (logged in GCP or not) access to buckets content. However, by default bucket will have disabled the option to expose publicly a bucket:

```bash
# Disable public prevention
gcloud storage buckets update gs://BUCKET_NAME --no-public-access-prevention

# Make all objects in a bucket public
gcloud storage buckets add-iam-policy-binding gs://BUCKET_NAME --member=allUsers --role=roles/storage.objectViewer
## I don't think you can make specific objects public just with IAM

# Make a bucket or object public (via ACL)
gcloud storage buckets update gs://BUCKET_NAME --add-acl-grant=entity=AllUsers,role=READER
gcloud storage objects update gs://BUCKET_NAME/OBJECT_NAME --add-acl-grant=entity=AllUsers,role=READER
```

If you try to give **ACLs to a bucket with disabled ACLs** you will find this error: `ERROR: HTTPError 400: Cannot use ACL API to update bucket policy when uniform bucket-level access is enabled. Read more at https://cloud.google.com/storage/docs/uniform-bucket-level-access`

To access open buckets via browser, access the URL `https://<bucket_name>.storage.googleapis.com/` or `https://<bucket_name>.storage.googleapis.com/<object_name>`

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