Most cloud providers support context-based authorization, enabling applications to benefit from strong access controls applied to a given context (e.g. Virtual Machine), without the need of managing authentication tokens and credentials.
For example, by granting a given Virtual Machine (or principal that such machine operates under) access to AWS S3, applications running inside that machine can request a token on-demand, which would grant them access to the AWS S3 buckets without having to store long lived credentials anywhere.
By leveraging such capability, Flux users can focus on the big picture, which is access controls enforcement with a least-privileged approach, whilst not having to do deal with security hygiene topics such as encrypting authentication secrets, and ensure they are being rotated regularly. All that is taken care of automatically by the cloud providers, as the tokens provided are context- and time-bound.
Below is a list of Flux features that support this functionality and their documentation:
|Supported||Source Controller||Bucket Repository Authentication||AWS||Guide|
|Supported||Source Controller||Bucket Repository Authentication||Azure||Guide|
|Supported||Source Controller||Bucket Repository Authentication||GCP||Guide|
|Supported||Source Controller||OCI Repository Authentication||AWS||Guide|
|Supported||Source Controller||OCI Repository Authentication||Azure||Guide|
|Supported||Source Controller||OCI Repository Authentication||GCP||Guide|
|Supported||Source Controller||Helm Repository Authentication||AWS||Guide|
|Supported||Source Controller||Helm Repository Authentication||Azure||Guide|
|Supported||Source Controller||Helm Repository Authentication||GCP||Guide|
|Supported||Image Reflector Controller||Container Registry Authentication||AWS||Guide|
|Supported||Image Reflector Controller||Container Registry Authentication||Azure||Guide|
|Supported||Image Reflector Controller||Container Registry Authentication||GCP||Guide|
|Supported||Kustomize Controller||SOPS Integration with Cloud KMS||AWS||Guide|
|Supported||Kustomize Controller||SOPS Integration with Cloud KMS||Azure||Guide|
|Supported||Kustomize Controller||SOPS Integration with Cloud KMS||GCP||Guide|
Support for context-based authorization should only increase over time.
For more information, please visit the tracking issue: https://github.com/fluxcd/flux2/issues/3003.