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Description:

apricotserver 0.0.6

Apricot
Apricot is a proxy for delegating LDAP requests to an OpenID Connect backend.
The name is a slightly tortured acronym for: LDAP proxy for OpenID Connect.
Usage
Start the Apricot server on port 1389 by running:
python run.py --client-id "<your client ID>" --client-secret "<your client secret>" --backend "<your backend>" --port 1389 --domain "<your domain name>" --redis-host "<your Redis server>"

If you prefer to use Docker, you can edit docker/docker-compose.yaml and run:
docker compose up

from the docker directory.
Using Redis [Optional]
You can use a Redis server to store generated uidNumber and gidNumber values in a more persistent way.
To do this, you will need to provide the --redis-host and --redis-port arguments to run.py.
Configure background refresh [Optional]
By default Apricot will refresh the LDAP tree whenever it is accessed and it contains data older than 60 seconds.
If it takes a long time to fetch all users and groups, or you want to ensure that each request gets a prompt response, you may want to configure background refresh to have it periodically be refreshed in the background.
This is enabled with the --background-refresh flag, which uses the --refresh-interval parameter as the interval to refresh the ldap database.
Using TLS [Optional]
You can set up a TLS listener to communicate with encryption enabled over the configured port.
To enable it you need to configure the tls port ex. --tls-port=1636, and provide a path to the pem files for the certificate --tls-certificate=<path> and the private key --tls-private-key=<path>.
Outputs
This will create an LDAP tree that looks like this:
dn: DC=<your domain>
objectClass: dcObject

dn: OU=users,DC=<your domain>
objectClass: organizationalUnit
ou: users

dn: OU=groups,DC=<your domain>
objectClass: organizationalUnit
ou: groups

Each user will have an entry like
dn: CN=<user name>,OU=users,DC=<your domain>
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
objectClass: posixAccount
objectClass: top
<user data fields here>
memberOf: <DN for each group that this user belongs to>

Each group will have an entry like
dn: CN=<group name>,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: posixGroup
objectClass: top
<group data fields here>
member: <DN for each user belonging to this group>

Primary groups
:exclamation: You can disable the creation of mirrored groups with the --disable-primary-groups command line option :exclamation:
Apricot creates an associated group for each user, which acts as its POSIX user primary group.
For example:
dn: CN=sherlock.holmes,OU=users,DC=<your domain>
objectClass: inetOrgPerson
objectClass: organizationalPerson
objectClass: person
objectClass: posixAccount
objectClass: top
...
memberOf: CN=sherlock.holmes,OU=groups,DC=<your domain>
...

will have an associated group
dn: CN=sherlock.holmes,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: posixGroup
objectClass: top
...
member: CN=sherlock.holmes,OU=users,DC=<your domain>
...

Mirrored groups
:exclamation: You can disable the creation of mirrored groups with the --disable-mirrored-groups command line option :exclamation:
Each group of users will have an associated group-of-groups where each user in the group will have its user primary group in the group-of-groups.
Note that these groups-of-groups are not posixGroups as POSIX does not allow nested groups.
For example:
dn:CN=Detectives,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: posixGroup
objectClass: top
...
member: CN=sherlock.holmes,OU=users,DC=<your domain>
...

will have an associated group-of-groups
dn: CN=Primary user groups for Detectives,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: top
...
member: CN=sherlock.holmes,OU=groups,DC=<your domain>
...

This allows a user to make a request for "all primary user groups needed by members of group X" without getting a large number of primary user groups for unrelated users. To do this, you will need an LDAP request that looks like:
(&(objectClass=posixGroup)(|(CN=Detectives)(memberOf=Primary user groups for Detectives)))

which will return:
dn:CN=Detectives,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: posixGroup
objectClass: top
...
member: CN=sherlock.holmes,OU=users,DC=<your domain>
...

dn: CN=sherlock.holmes,OU=groups,DC=<your domain>
objectClass: groupOfNames
objectClass: posixGroup
objectClass: top
...
member: CN=sherlock.holmes,OU=users,DC=<your domain>
...

OpenID Connect
Instructions for specific OpenID Connect backends below.
Microsoft Entra
You will need to use the following command line arguments:
--backend MicrosoftEntra --entra-tenant-id "<your tenant ID>"

You will need to register an application to interact with Microsoft Entra.
Do this as follows:

Create a new App Registration in your Microsoft Entra.

Set the name to whatever you choose (e.g. apricot)
Set access to Accounts in this organizational directory only.
Set Redirect URI to Public client/native (mobile & desktop) with a value of urn:ietf:wg:oauth:2.0:oob

Under Certificates & secrets add a New client secret

Set the description to whatever you choose (e.g. Apricot Authentication Secret)
Set the expiry time to whatever is relevant for your use-case
You must record the value of this secret at creation time, as it will not be visible later.

Under API permissions:

Enable the following permissions:

Microsoft Graph > User.Read.All (application)
Microsoft Graph > GroupMember.Read.All (application)
Microsoft Graph > User.Read.All (delegated)

Select this and click the Grant admin consent button (otherwise each user will need to manually consent)

Keycloak
You will need to use the following command line arguments:
--backend Keycloak --keycloak-base-url "<your hostname>/<path to keycloak>" --keycloak-realm "<your realm>"

You will need to register an application to interact with Keycloak.
Do this as follows:

Create a new Client in your Keycloak instance.

Set the name to whatever you choose (e.g. apricot)
Enable Client authentication
Enable the following authentication flows and disable the rest:

Direct access grants
Service account roles

Under Credentials copy client secret
Under Service account roles:

Click on Assign role then Filter by clients
Assign the following roles:

realm-management > view-users
realm-management > manage-users
realm-management > query-groups
realm-management > query-users