/etc/one/group.default is in opennebula 3.4.1-3.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # This rule allows users in the new group to create common resources
VM+NET+IMAGE+TEMPLATE/* CREATE
# This rule allows users in the group to deploy VMs in any host in the cloud
HOST/* MANAGE
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