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May 8 – 12, 2023
Norfolk Waterside Marriott
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POSIX access to remote storage with OpenID Connect AuthN/AuthZ

May 8, 2023, 11:30 AM
Norfolk Ballroom III-V (Norfolk Waterside Marriott)

Norfolk Ballroom III-V

Norfolk Waterside Marriott

235 East Main Street Norfolk, VA 23510
Oral Track 1 - Data and Metadata Organization, Management and Access Track 1 - Data and Metadata Organization, Management and Access


Dr Fornari, Federico (INFN-CNAF)


INFN-CNAF is one of the Worldwide LHC Computing Grid (WLCG) Tier-1 data centers, providing support in terms of computing, networking, storage resources and services also to a wide variety of scientific collaborations, ranging from physics to bioinformatics and industrial engineering.
Recently, several collaborations working with our data center have developed computing and data management workflows that require access to S3 storage services and the integration with POSIX capabilities.
To accomplish this requirement in distributed environments, where computing and storage resources are located at geographically distant physical sites, the possibility to locally mount a file system from a remote site to directly perform operations on files and directories becomes crucial.
Nevertheless, the access to the data must be regulated by standard, federated authentication and authorization mechanisms, such as OpenID Connect (OIDC), which is already adopted as AuthN/AuthZ mechanism within WLCG and the European Open Science Cloud (EOSC).
Starting from such principles, we evaluated the possibility to regulate data access by integrating JSON Web Token (JWT) authentication, provided by INDIGO-IAM as Identity Provider (IdP), with solutions based on S3 (for object storage) and HTTP (for hierarchical storage) protocols.
In particular, in regard to S3 data exposition, we integrated MinIO and CEPH RADOS Gateway with s3fs-fuse, providing the needed custom libraries to mount an S3 bucket via FUSE by preserving the native object format for files. Both solutions support Secure Token Service (STS), providing a client with temporary credentials to perform a given operation on a storage resource by checking the value of a JWT claim associated with the request.
Native MinIO STS does not support IAM JWT profile, thus we delegated STS service to Hashicorp Vault in the case of MinIO.
RADOS Gateway is an object storage interface for Ceph. It provides a RESTful S3-compatible API and a feature for integration with OIDC IdP. Access tokens produced for OIDC clients can be used by the STS implemented within RADOS Gateway for authorizing specific S3 operations.
On the other hand, HTTP data access has been managed by using Rclone and WebDAV protocol, to mount a storage area via INDIGO-IAM token authentication. In this case the storage area is exposed via HTTP by using the StoRM-WebDAV application, but the solution is general enough to be used with other HTTP data management servers (e.g. Apache, NGINX).
In such respect, a comparison between the performances yielded by S3 and WebDAV protocols has been carried out within the same Red Hat OpenShift environment, in order to better understand which solution is most suitable for each of the use cases of interest.

Consider for long presentation Yes

Primary author

Dr Fornari, Federico (INFN-CNAF)


Dr Alkhansa, Ahmad (INFN-CNAF) Dr Pellegrino, Carmelo (INFN-CNAF) Prof. Salomoni, Davide (INFN-CNAF) Costantini, Alessandro (INFN CNAF)

Presentation materials