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VOMS importer

This is a python script that can be used to import data from a VOMS Admin VO into an IAM organization.

Devcontainer support

For those who use VSCode, there is support for a remote Devcontainer, which comes preconfigured with the test VOMS at meteora.cloud.cnaf.infn.it.

Note (and beware) that $HOME/.globus and $HOME/.config/oidc-agent are mounted from the host.

To run the vomsimporter script, you first need to obtain an admin VOMS proxy with voms-proxy-init and an admin access token with oidc-token.

Installing the importer

vomsimporter requires a Python 2.7 environment as some of its dependencies are available only for Python 2. The following Python modules are required and can be installed from EL7 RPMs:

  • ldap (from OS repository)
  • voms-admin-client
  • python2-zsi (from UMD-4 repository)

In addition it is necessary to build the executable dn_converter from docker/rfc2253/rfc2253.cpp and move it to the path (or add its path to PATH environment variable). The command to build the executable (see also the source file) is:

g++ -std=c++11 rfc2253.cpp -lcrypto -o dn_converter

You also need to have access to the grid-proxy-init command. Alternatively, you can use this command on another server where it is available and copy the proxy file in /tmp on the machine where you run vomsimporter.

Running the importer

This is an example to import users from the test.vo hosted in meteora, into iam-dev.

Pre-requisites

  • be an admin of meteora
  • be an admin of iam-dev
  • the X.509 certificate linked to the VOMS admin has to be the same as for the IAM admin
  • have a local oidc-configuration (generated with Centos7) whith at least the following scopes allowed: openid iam:admin.read iam:admin.write scim:read scim:write proxy:generate
  • Load a proxy certificate into INDIGO IAM with a lifetime long enough to complete the VOMS migration (or you will have to refresh it once it is expired). This is done by clicking on button Add managed proxy certificate and pasting the contents of your grid proxy. To get a 1 week grid proxy, use the following command:
grid-proxy-init -valid 240:0

Define the following environment variables:

OIDC_AGENT_ALIAS=<your-client-alias>
OIDC_AGENT_SECRET=<your-client-secret>
IAM_ENDPOINT=https://iam-dev.cloud.cnaf.infn.it
IAM_HOST=iam-dev.cloud.cnaf.infn.it
VOMS_HOST=meteora.cloud.cnaf.infn.it
VOMS_VO=test.vo
X509_USER_PROXY=/tmp/x509up_u1000

Initialize your admin credentials with

$ ./docker/init-credentials.sh

This will initialize a proxy from the certificate loaded in INDIGO IAM and create a token.

Run the importer with

python vomsimporter.py --vo ${VOMS_VO} --voms-host ${VOMS_HOST} --iam-host ${IAM_HOST} --skip-duplicate-accounts-checks --username-attr nickname --debug --voms-port 8443

If you have SSL errors running this command, you can use curl to validate that everything is ok in your configuration. After obtaining a proxy with the command grid-proxy-init (the proxy build by init-credentials does not work with curl), enter the following command (/path/to/user/certificate is the certificate used to generate the proxy in PEM format):

curl --cert /tmp/x509up_u1000  --cacert /path/to/user/certificate --capath /etc/grid-security/certificates/  https://meteora.cloud.cnaf.infn.it/voms/test.vo

Once you have fixed the problems with the curl command, try again to run vomsimporter. If it still fails, try to add the option --insecure which disables SSL certificate verification.