univention / container-ldap

Disclaimer - Work in progress

The repository you are looking into is work in progress.

It contains proof of concept and preview builds in development created in context of the openDesk project.

The repository's content provides you with first insights into the containerized cloud IAM from Univention, derived from the UCS appliance.

Containers for Univention LDAP

The repository does contain the following two containers:

• ldap-server runs OpenLDAP.
• ldap-notifier does run the Univention Directory Notifier.

Start based on docker compose

The repository does include a compose file to start things up quickly. It will start three services:

• ldap-server - The OpenLDAP server.
• ldap-notifier - The Univention Directory Notifier.
• ldap-admin - An instance of phpLDAPadmin as a web UI to access ldap-server.

To set it up:

1. Copy the .env file .env.ldap-server.example to .env.ldap-server and adjust as needed.

2. Bring up the services by running:

   docker compose up
   

The web UI is by default available at http://localhost:8001.

Interacting with ldap-server

From the command line if you have the required tools available:

ldapwhoami -H ldap://localhost:389 -x -D cn=admin,dc=univention-organization,dc=intranet -w univention

ldapsearch -H ldap://localhost:389 -x -D cn=admin,dc=univention-organization,dc=intranet -w univention -b dc=univention-organization,dc=intranet

Interacting with the ldap-notifier

One option is to connect the base listener to the running notifier, this does involve manual tweaking at the moment though. The process is roughly as follows:

• Have the container-listener-base repository available and be able to run it via docker compose. Set the .env.listener according to your local containers.

Manually testing a full round trip

The easiest way is to open phpLDAPadmin and change the description of the admin user.

Have the container-listener-base and the services from this repository running.

1. Open the web UI, by default http://localhost:8001.

2. Log in, typically using cn=admin,dc=univention-organization,dc=intranet and the password matching your setting from the file .env.ldap-server.

3. Find the object cn=admin,dc=univention=organization,dc=intranet.

4. Add or change the attribute "description" and save the new value.

5. Don't forget to confirm that you want to change the value. ;-)

6. Observe that the base-listener logs details about the change. This means the change went into ldap-server and arrived in ldap-notifier and finally made its way to base-listener.

Linting

You may run the pre-commit linter as follows:

docker compose run pre-commit

Testing

The tests are grouped in the folder ./tests. Details are described in the file ./tests/README.md.

TLS

If TLS termination by the LDAP server is required, you need to set TLS_MODE=secure and provide the following secrets:

• CA_CERT_FILE: The CA certificate in PEM format.
• CERT_PEM_FILE: The server's (public) certificate in PEM format.
• PRIVATE_KEY_FILE: The private key to the server's certificate.
• DH_PARAM_FILE: Diffie-Hellman parameters.

The file ./generate-secrets.sh can be used to generate a set of secrets. Then enable the respective options in .env.ldap-server.

In order for clients to connect properly

• the CA certificate must also be known and trusted by the client,
• the LDAP server must be reachable by the hostname listed in its certificate. (Maybe Subject Alternative Names can be useful here.)

Setting the UCR variable uldap/start-tols to 0 disables TLS support. In this case, no certificate files need to be provided.

Logging

The log level can be set through the UCR variable ldap/debug/level as a comma-separated list of values found in the OpenLDAP documentation.

The default is ldap/debug/level: stats.

Notifier Data Files

OpenLDAP translog output file

Location: /var/lib/univention-ldap/listener/listener

Needs to be shared between ldap-server and ldap-notifier container. Lines get added by the translog-slapd-overlay on LDAP-Object change. The notifier removes lines after processing them.

Translog lock-file

Location: /var/lib/univention-ldap/listener/listener.lock

Needs to be shared between ldap-server and ldap-notifier container. Created by the entrypoint script of the ldap-server container. Written by the translog-slapd-overlay and the notifier.

Processed notifier transactions (db)

Location: /var/lib/univention-ldap/notify/transaction.index

Written by the notifier. Binary data.

Notifier lock-file

Location: /var/lib/univention-ldap/notify/transaction.lock

Written by the notifier.

Processed notifier transactions (flat file)

Location: /var/lib/univention-ldap/notify/transaction

Written by the notifier. Contains transaction lines. A line contains transaction-id, DN and change-type separated by space.

Notifier log-file

Location: /var/log/univention/notifier.log

The log-path is hard-coded but should be configurable to use stdout instead. See management/univention-directory-notifier/src/univention-directory-notifier.c in the ucs-repository!

LDAP-API

Location: /var/run/slapd/ldapi

The notifier is hard-coded to connect via ldapapi:///. Therefore the ldapi file needs to be shared from the OpenLDAP server container.