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The WLCG Virtual Organization

An instance of IAM has been deployed in support of WLCG development and integration activities in support of the migration to token-based authentication and authorization.

The WLCG IAM instance is integrated with CERN SSO.

Registration is active.

IAM documentation is available here.

Clients applications can be registered following these instructions, or using oidc-agent.

VOMS support is enabled. To link an X.509 certificate to an existing IAM WLCG account, follow these instructions. As in VOMS, multiple certificates can be linked to an account.

WLCG VO VOMS configuration

New LSC files will be rolled out on Nov. 22nd, 2021

On Monday Nov. 22nd, 2021 at 11 we will update the WLCC VO LSC configuration. The reason for the update is that the current certificate is going to expire and that the Sectigo CA INFN currently uses has changed the structure of the DNs of the issued certificates.

The updated configuration that you find here is compliant with the new certificate.

Do not roll out this configuration before Nov. 22nd, or VOMS validation will break at your site.

To have a working VOMS configuration for the WLCG VO:

  1. place the lsc file in the /etc/grid-security/vomsdir/wlcg directory
  2. place the vomses file in the /etc/vomses directory (only needed if you need to do voms-proxy-init)

RPM installation

You can use the following RPM package to enable support for the WLCG VO on your RHEL machine:

VOMS clients compatibility

The latest supported VOMS clients are required.

Also note that this VO is supported by IAM, i.e. there are no VOMS Admin endpoints that can be used to generate Gridmap files.


$ voms-proxy-init -voms wlcg
Enter GRID pass phrase for this identity:
Contacting [/DC=org/DC=terena/DC=tcs/C=IT/L=Frascati/O=Istituto Nazionale di Fisica Nucleare/] "wlcg"...
Remote VOMS server contacted succesfully.

Created proxy in /tmp/x509up_u501.

Your proxy is valid until Thu Jan 30 03:47:58 CET 2020

$ voms-proxy-info -all
subject   : /DC=org/DC=terena/DC=tcs/C=IT/O=Istituto Nazionale di Fisica Nucleare/CN=Andrea Ceccanti
issuer    : /DC=org/DC=terena/DC=tcs/C=IT/O=Istituto Nazionale di Fisica Nucleare/CN=Andrea Ceccanti
identity  : /DC=org/DC=terena/DC=tcs/C=IT/O=Istituto Nazionale di Fisica Nucleare/CN=Andrea Ceccanti
type      : RFC3820 compliant impersonation proxy
strength  : 1024
path      : /tmp/x509up_u501
timeleft  : 11:59:55
key usage : Digital Signature, Key Encipherment, Data Encipherment
=== VO wlcg extension information ===
VO        : wlcg
subject   : /DC=org/DC=terena/DC=tcs/C=IT/O=Istituto Nazionale di Fisica Nucleare/CN=Andrea Ceccanti
issuer    : /DC=org/DC=terena/DC=tcs/C=IT/L=Frascati/O=Istituto Nazionale di Fisica Nucleare/
attribute : /wlcg
attribute : /wlcg/xfers
timeleft  : 11:59:55
uri       :