/etc/one/auth/ldap_auth.conf is in ruby-opennebula 4.12.3+dfsg-3.1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright 2010-2015, C12G Labs S.L                                           #
#                                                                              #
# Licensed under the Apache License, Version 2.0 (the "License"); you may      #
# not use this file except in compliance with the License. You may obtain      #
# a copy of the License at                                                     #
#                                                                              #
# http://www.apache.org/licenses/LICENSE-2.0                                   #
#                                                                              #
# Unless required by applicable law or agreed to in writing, software          #
# distributed under the License is distributed on an "AS IS" BASIS,            #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.     #
# See the License for the specific language governing permissions and          #
# limitations under the License.                                               #
# ---------------------------------------------------------------------------- #
server 1:
    # Ldap user able to query, if not set connects as anonymous. For
    # Active Directory append the domain name. Example:
    # Administrator@my.domain.com
    #:user: 'admin'
    #:password: 'password'
    # Ldap authentication method
    :auth_method: :simple
    # Ldap server
    :host: localhost
    :port: 389
    # Uncomment this line for tsl conections
    #:encryption: :simple_tls
    # base hierarchy where to search for users and groups
    :base: 'dc=domain'
    # group the users need to belong to. If not set any user will do
    #:group: 'cn=cloud,ou=groups,dc=domain'
    # field that holds the user name, if not set 'cn' will be used
    :user_field: 'cn'
    # for Active Directory use this user_field instead
    #:user_field: 'sAMAccountName'
    # field name for group membership, by default it is 'member'
    #:group_field: 'member'
    # user field that that is in in the group group_field, if not set 'dn' will be used
    #:user_group_field: 'dn'
    # Generate mapping file from group template info
    :mapping_generate: true
    # Seconds a mapping file remain untouched until the next regeneration
    :mapping_timeout: 300
    # Name of the mapping file in OpenNebula var diretory
    :mapping_filename: server1.yaml
    # Key from the OpenNebula template to map to an AD group
    :mapping_key: GROUP_DN
    # Default group ID used for users in an AD group not mapped
    :mapping_default: 1
# this example server wont be called as it is not in the :order list
server 2:
    :auth_method: :simple
    :host: localhost
    :port: 389
    :base: 'dc=domain'
    #:group: 'cn=cloud,ou=groups,dc=domain'
    :user_field: 'cn'
# List the order the servers are queried
:order:
    - server 1
    #- server 2
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