LDAP tasks and administrative operations¶
In addition to maintaining the system-wide LDAP client configuration on a host,
the debops.ldap role can be used to perform tasks in the LDAP directory
ldap_attrs  Ansible modules. The LDAP
tasks are performed via Ansible task delegation functionality, on the Ansible
Controller. This behaviour can be controlled using the
default variables. Check the ldap__tasks documentation for syntax
and examples of usage.
Authentication to the LDAP directory¶
ansible_user variable is defined in the Ansible inventory, the
debops.ldap role will use it as the value of the
uid= attribute to
bind to the LDAP directory. Otherwise, the role will use the username of the
current Ansible user (from the Ansible Controller host) to do the same, by
default binding as a Distinguished Name:
The DN can be overridden in the
ldap__admin_binddn variable, either
via Ansible inventory (this should be avoided if the inventory is shared
between multiple administrators), or using an environment variable on the
The bind password is retrieved from the pass password manager on the
Ansible Controller, or from an environment variable (see below). If the bind
password is not provided (the
ldap__admin_bindpw variable is empty),
the LDAP tasks will be skipped. This allows the debops.ldap role to be
used in a playbook with other roles without the fear that lack of LDAP
credentials will break execution of said playbook.
Secure handling of LDAP admin credentials¶
The LDAP password of the current Ansible user is defined in the
ldap__admin_bindpw default variable. The role checks if the
$DEBOPS_LDAP_ADMIN_BINDPW environment variable (on the Ansible Controller)
is defined and uses its value as the password during connections to the LDAP
If the environment variable is not defined, the role will try and lookup the password using the passwordstore Ansible lookup plugin. The plugin uses the pass password manager as a backend to store credentials encrypted using the GPG key of the user.
The path in the pass storage directory where the debops.ldap
will look for credentials is defined by the
ldap__admin_passwordstore_path, by default it's
debops/ldap/credentials/. The actual encrypted files with the password
are named based on the UUID value of the current user Distinguished Name used
as the BindDN (in the
ldap__admin_binddn variable). The UUID
conversion is used because LDAP Distinguished Names can contain spaces, and the
Ansible lookups don't work too well with filenames that contain spaces.
You can use the
ldap/get-uuid.yml playbook to convert user account DNs
or arbitrary LDAP Distinguished Names to an UUID value you can use to look up
the passwords manually, if needed.
You can store new credentials in the pass password manager using the
ansible/playbooks/ldap/save-credential.yml Ansible playbook included
in the DebOps monorepo. All you need to do is run this playbook against one of
the LDAP servers:
debops ldap/save-credential -l <host>
The playbook will ask interactively for the
uid= username, and if not
provided, for the full LDAP Distinguished Name, and after that, for a password
to store encrypted using your GPG key. If you don't specify one, a random
password will be automatically generated, saved in the password store, and
displayed for you to use in the LDAP directory.
Different modes of operation¶
The role acts differently depending on the current configuration of the remote host and its own environment:
- If the debops.ldap role configuration was not applied on the host, the role will set up system-wide LDAP configuration file, and perform the default LDAP tasks, tasks defined in the Ansible inventory, and any tasks provided via role dependent variables which are usually defined by other roles (see Use as a dependent role for more details).
- If the debops.ldap role configuration was already applied on the host, and there are no LDAP tasks defined by other Ansible roles, the debops.ldap role will apply the default LDAP tasks and the tasks from Ansible inventory (standalone mode).
- If the debops.ldap role configuration was already applied on the host,
and the role is used as a dependency for another role, the default LDAP tasks
and the tasks from Ansible inventory will be ignored, and only those provided
ldap__dependent_tasksvariable by other Ansible roles will be executed in the LDAP directory (dependent mode).
This ensures that the list of LDAP tasks is short, and tasks defined by default in the role, and those defined in the Ansible inventory, which are presumed to be done previously, are not unnecessarily repeated when dependent role LDAP tasks are performed.
Because the debops.ldap role relies on the LDAP credentials of the current Ansible user, the person that executes Ansible does not require full access to the entire LDAP directory. The role can perform tasks only on specific parts of the directory depending on the Access Control List of the LDAP directory server and permissions of the current user.
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