Integrate with QNAP NAS - Authentik

What is QNAP NAS

QNAP Systems, Inc. is a Taiwanese corporation that specializes in network-attached storage appliances used for file sharing, virtualization, storage management and surveillance applications.

-- https://en.wikipedia.org/wiki/QNAP_Systems

Connecting a QNAP NAS to an LDAP Directory is a little bit special as it is not (well) documented what really is done behind the scenes of QNAP.

Preparation

The following placeholders are used in this guide:

ldap.baseDN is the Base DN you configure in the LDAP provider.
ldap.domain is (typically) a FQDN for your domain. Usually it is just the components of your base DN. For example, if ldap.baseDN is dc=ldap,dc=goauthentik,dc=io then the domain might be ldap.goauthentik.io.
ldap.searchGroup is the "Search Group" that can see all users and groups in authentik.
qnap.serviceAccount is a service account created in authentik
qnap.serviceAccountToken is the service account token generated by authentik.

:::info This documentation lists only the settings that you need to change from their default values. Be aware that any changes other than those explicitly mentioned in this guide could cause issues accessing your application. :::

Create an LDAP Provider if you don't already have one set up. This guide assumes you will be running with TLS. See the ldap provider docs for setting up SSL on the authentik side.

Remember the ldap.baseDN you have configured for the provider as you'll need it in the sssd configuration.

Create a new service account for all of your hosts to use to connect to LDAP and perform searches. Make sure this service account is added to ldap.searchGroup.

:::caution It seems that QNAP LDAP client configuration has issues with too long password. Max password length <= 66 characters. :::

Deployment

Create an outpost deployment for the provider you've created above, as described here. Deploy this Outpost either on the same host or a different host that your QNAP NAS can access.

The outpost will connect to authentik and configure itself.

NAS Configuration

The procedure is a two step setup:

QNAP Web UI: Used to setup and store initial data. Especially to store the encrypted bind password.
SSH config Edit: In order to adapt settings to be able to communicate with authentik LDAP Outpost.

:::info The config edit is essential, as QNAP relies on certain not configurable things. The search for users and groups relies on a fix filter for objectClass in posixAccount or posixGroup classes.

Also by default the search scope is set to one (singleLevel), which can be adapted in the config to sub (wholeSubtree).

Sample LDAP request from QNAP

Default search for users

text

Scope: 1 (singleLevel)
Deref Aliases: 0 (neverDerefAliases)
Size Limit: 0
Time Limit: 0
Types Only: false
Filter: (objectClass=posixAccount)
Attributes:
    uid
    userPassword
    uidNumber
    gidNumber
    cn
    homeDirectory
    loginShell
    gecos
    description
    objectClass

Default search for groups

text

Scope: 1 (singleLevel)
Deref Aliases: 0 (neverDerefAliases)
Size Limit: 0
Time Limit: 0
Types Only: false
Filter: (objectClass=posixGroup)
Attributes:
    cn
    userPassword
    memberUid
    gidNumber

:::

QNAP Web UI

Configure the following values and "Apply"

:::caution With each save (Apply) in the UI the /etc/config/nss_ldap.conf will be overwritten with default values. :::

:::info The UI Configuration is necessary, as it will save the Password encrypted in /etc/config/nss_ldap.ensecret. :::

SSH

Connect your QNAP NAS via SSH. First stop the LDAP Service:

bash

/sbin/setcfg LDAP Enable FALSE
/etc/init.d/ldap.sh stop

Edit the file at /etc/config/nss_ldap.conf:

conf

host                        ${ldap.domain}
base                        ${ldap.baseDN}
uri                         ldaps://${ldap.domain}/
ssl                         on
rootbinddn                  cn=${qnap.serviceAccount},ou=users,${ldap.baseDN}
# authentik has no memberUid therefore switch to
nss_schema                  rfc2307bis

# remap object classes to authentik ones
nss_map_objectclass         posixAccount    user
nss_map_objectclass         shadowAccount   user
nss_map_objectclass         posixGroup      group

# remap attributes
# uid to cn is essential otherwise only id usernames will occur
nss_map_attribute           uid             cn
# map displayName information into comments field
nss_map_attribute           gecos           displayName
# see https://ldapwiki.com/wiki/Wiki.jsp?page=GroupOfUniqueNames%20vs%20groupOfNames
nss_map_attribute           uniqueMember    member

# configure scope per search filter
nss_base_passwd             ou=users,${ldap.baseDN}?one
nss_base_shadow             ou=users,${ldap.baseDN}?one
nss_base_group              ou=groups,${ldap.baseDN}?one

tls_checkpeer               no
referrals                   no
bind_policy                 soft
timelimit                   120
tls_ciphers                 EECDH+CHACHA20:EECDH+CHACHA20-draft:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:!MD5
nss_initgroups_ignoreusers  admin,akadmin

Now start the LDAP Service:

bash

/sbin/setcfg LDAP Enable TRUE
/etc/init.d/ldap.sh start

To see if connection is working, type

bash

# list users
$ getent passwd

The output should list local users and authentik accounts.

bash

# list groups
$ getent group

The output should list local and authentik groups.