GCP - Storage Post Exploitation

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Almacenamiento en la Nube

For more information about CLoud Storage check this page:

GCP - Storage Enum

Dar Acceso Público

Es posible dar acceso a usuarios externos (con o sin sesión en GCP) al contenido de los buckets. Sin embargo, por defecto, el bucket tendrá desactivada la opción de exponer públicamente un bucket:

# 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

Si intentas dar ACLs a un bucket con ACLs deshabilitadas encontrarás este 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

Para acceder a buckets abiertos a través del navegador, accede a la URL https://<bucket_name>.storage.googleapis.com/ o https://<bucket_name>.storage.googleapis.com/<object_name>

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