lldap/example_configs/nextcloud.md

Nextcloud LLDAP example config

lldap users & groups

This example is using following users & groups in lldap :

• A technical user (ex: ro_admin), member of lldap_strict_readonly or lldap_password_manager
• A catch-all group called nextcloud_users.
• Members of nextcloud_users group will be authorized to log in Nextcloud.
• Some "application" groups, let's say friends and family: users in Nextcloud will be able to share files and view people in dynamic lists only to members of their own group(s).
• Users in family and friends should also be users in nextcloud_users group!

If you plan on following this tutorial line-by-line, you will now have the following:

• 6 groups:
  1. nextcloud_users
  2. family
  3. friends
  4. lldap_strict_readonly
  5. lldap_password_manager
  6. ldap_admin
• 1 admin user in any of the following groups:
  1. lldap_password_manager
  2. lldap_strict_readonly
• (Atleast) 1 user in the nextcloud_users group
• (Optional) Any number of users in the friends or family group.

Nextcloud config : the cli way

TL;DR let's script it. The "user_ldap" application is shipped with default Nextcloud installation (at least using Docker official stable images), you just have to install & enable it :

occ app:install user_ldap
occ app:enable user_ldap
occ ldap:create-empty-config

# EDIT: domain
occ ldap:set-config s01 ldapHost "ldap://lldap.example.net."
occ ldap:set-config s01 ldapPort 3890
# EDIT: admin user
occ ldap:set-config s01 ldapAgentName "uid=ro_admin,ou=people,dc=example,dc=com"
# EDIT: password
occ ldap:set-config s01 ldapAgentPassword "password"
# EDIT: Base DN
occ ldap:set-config s01 ldapBase "dc=example,dc=com"
occ ldap:set-config s01 ldapBaseUsers "dc=example,dc=com"
occ ldap:set-config s01 ldapBaseGroups "dc=example,dc=com"
occ ldap:set-config s01 ldapConfigurationActive 1
occ ldap:set-config s01 ldapLoginFilter "(&(objectclass=person)(uid=%uid))"
# EDIT: nextcloud_users group, contains the users who can login to Nextcloud
occ ldap:set-config s01 ldapUserFilter "(&(objectclass=person)(memberOf=cn=nextcloud_users,ou=groups,dc=example,dc=com))"
occ ldap:set-config s01 ldapUserFilterMode 0
occ ldap:set-config s01 ldapUserFilterObjectclass person
occ ldap:set-config s01 turnOnPasswordChange 0
occ ldap:set-config s01 ldapCacheTTL 600
occ ldap:set-config s01 ldapExperiencedAdmin 0
occ ldap:set-config s01 ldapGidNumber gidNumber
# EDIT: list of application groups
occ ldap:set-config s01 ldapGroupFilter "(&(objectclass=groupOfUniqueNames)(|(cn=friends)(cn=family)))"
# EDIT: list of application groups
occ ldap:set-config s01 ldapGroupFilterGroups "friends;family"
occ ldap:set-config s01 ldapGroupFilterMode 0
occ ldap:set-config s01 ldapGroupDisplayName cn
occ ldap:set-config s01 ldapGroupFilterObjectclass groupOfUniqueNames
occ ldap:set-config s01 ldapGroupMemberAssocAttr uniqueMember
occ ldap:set-config s01 ldapEmailAttribute "mail" 
occ ldap:set-config s01 ldapLoginFilterEmail 0
occ ldap:set-config s01 ldapLoginFilterUsername 1
occ ldap:set-config s01 ldapMatchingRuleInChainState unknown
occ ldap:set-config s01 ldapNestedGroups 0
occ ldap:set-config s01 ldapPagingSize 500
occ ldap:set-config s01 ldapTLS 0
occ ldap:set-config s01 ldapUserAvatarRule default
occ ldap:set-config s01 ldapUserDisplayName displayname
occ ldap:set-config s01 ldapUserFilterMode 1
occ ldap:set-config s01 ldapUuidGroupAttribute auto
occ ldap:set-config s01 ldapUuidUserAttribute auto
occ ldap:set-config s01 ldapExpertUsernameAttr user_id

With a bit of of luck, you should be able to log in your nextcloud instance with LLDAP accounts in the nextcloud_users group.

Nextcloud config : the GUI way

1. enable LDAP application (installed but not enabled by default)
2. setup your ldap server in Settings > Administration > LDAP / AD integration
3. setup Group limitations

LDAP server config

Fill the LLDAP domain and port, DN + password of your technical account and base DN (as usual : change example.com by your own domain) :

Users tab

Select person as object class and then choose Edit LDAP Query : the only from these groups option is not functional. We want only users from the nextcloud_users group to be allowed to log in Nextcloud :

(&(objectclass=person)(memberOf=cn=nextcloud_users,ou=groups,dc=example,dc=com))

You can check with Verify settings and count users that your filter is working properly (here your accounts admin and ro_admin will not be counted as users).

Login attributes

Select Edit LDAP Query and enter :

(&(objectclass=person)(uid=%uid))

Enter a valid username in lldap and check if your filter is working.

Groups

You can use the menus for this part : select groupOfUniqueNames in the first menu and check every group you want members to be allowed to view their group member / share files with. For example:

(&(|(objectclass=groupOfUniqueNames))(|(cn=family)(cn=friends)))

Expert

Set Internal Username to user_id. This is needed to that the user ID used by Nextcloud corresponds to the user_id field and not the UUID field.

Sharing restrictions

Go to Settings > Administration > Sharing and check following boxes :

• "Allow username autocompletion to users within the same groups"