LDAP

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For use with Spacenet we've installed OpenLDAP on NURDServer. On the new NURDServices we're going serious with LDAP.

Status

Slapd and FusionDirectory are running on NURDServices. FusionDirectory can be accessed on https://ldap.nurdspace.nl.

Connected machines and services

Workstations

The workstations listed above are set up as follows:

  • Homedirs mounted over NFS from Proxmox1 (except user 'printer' on PrinterPC)
  • Users in the LDAP 'sudo' group can sudo.
  • Homedirs are created on the NFS-export when adding a user to LDAP (like this)

Setting up other workstations in this way

To get this to work you need to:

  • create all local users in LDAP (if they don't exist already)
  • delete local users (optional)
  • move homedirs to nurdservices (fix ownership because LDAP-users have a different UID)
  • delete local homedirs
  • mount /home from proxmox1:/mnt/md0/homedirs over nfs (put it in /etc/fstab)
  • put https://www.sslcertificaten.nl/files/PositiveSSLCA2.crt in /etc/ssl/certs/ with permissions 644
  • install libnss-ldapd and libpam-ldap (URI ldaps://ldap.nurdspace.nl/)
  • the installation of libnss-ldap and libpam-ldap don't offer all required settings, so fix nslcd.conf and pam_ldap.conf to mention at least the following:
uri ldaps://ldap.nurdspace.nl/
base dc=nurdspace,dc=lan
binddn cn=read-user,ou=systems,dc=nurdspace,dc=lan
bindpw (obtain from other machine)
ssl on
tls_reqcert demand
tls_cacertfile /etc/ssl/certs/PositiveSSLCA2.crt

Useful reading: http://www.debian-administration.org/article/OpenLDAP_installation_on_Debian

In certain cases sudo can break. This can be fixed with a patch while it's not fixed properly.

Wiki

  • Port 636 (ldaps) is forwarded to NURDServices for usage by the Wiki.
  • [1] is installed on the Wiki
  • Users in the group 'wikiusers' can log in. Admins, bureaucrats and sysops are locally managed.
  • Full addition to LocalSettings.php:
#LDAP Auth
require_once( "$IP/extensions/LdapAuthentication/LdapAuthentication.php" );
$wgAuth = new LdapAuthenticationPlugin();
$wgLDAPDebug = 9;
$wgDebugLogGroups['ldap'] = '/tmp/debug.log';

$wgLDAPDomainNames = array( 'nurdspace.lan', );
$wgLDAPServerNames = array( 'nurdspace.lan' => 'ldap.nurdspace.nl', );
$wgLDAPUseLocal = false;
$wgLDAPEncryptionType = array( 'nurdspace.lan' => 'ssl', );
$wgLDAPSearchStrings = array( 'nurdspace.lan' => 'uid=USER-NAME,ou=people,dc=nurdspace,dc=lan', );
$wgLDAPLowerCaseUsername = array( 'nurdspace.lan' => true );
$wgLDAPRequiredGroups = array( 'nurdspace.lan' => array( 'cn=wikiusers,ou=groups,dc=nurdspace,dc=lan', ) );
$wgLDAPGroupUseFullDN = array( "nurdspace.lan"=>false );
$wgLDAPGroupObjectclass = array( "nurdspace.lan"=>"posixGroup" );
$wgLDAPGroupAttribute = array( "nurdspace.lan"=>"memberUid" );
$wgLDAPGroupSearchNestedGroups = array( "nurdspace.lan"=>false );
$wgLDAPGroupNameAttribute = array( "nurdspace.lan"=>"cn" );
$wgLDAPBaseDNs = array( "nurdspace.lan"=>"dc=nurdspace,dc=lan" );
$wgLDAPUseLDAPGroups = array( "nurdspace.lan"=>true );
$wgGroupPermissions['wikiusers']['edit'] = true;
$wgGroupPermissions['admins'] = $wgGroupPermissions['sysop'];

# This hook is called by the LdapAuthentication plugin. It is a configuration hook. Here we
# are specifying what attibute we want to use for a username in the wiki.
# Note that this hook is NOT called on a straight bind.
# The hook calls the function defined below.
$wgHooks['SetUsernameAttributeFromLDAP'][] = 'SetUsernameAttribute';

Some settings might not be necessary, such as the wgGroupPermissions and wgHooks. I'll do some experimenting to see if it can be cleaned up.

Limitations

Wifi

The LDAP serves as a userdb for Spacenet, which is connected via FreeRADIUS. For full details see the Spacenet-page.

To do

  • Read http://www.openldap.org/doc/admin24/slapdconf2.html
  • FTPd nevermind
  • Samba nevermind
  • Cert installed for ldap.nurdspace.nl. Allow access only over TLS as soon as this works (ldapsearch -v -H ldaps://ldap.nurdspace.nl/ -D uid=fwd,ou=people,dc=nurdspace,dc=lan -W -b dc=nurdspace,dc=lan)
  • Fix "nurdservices slapd[32524]: <= bdb_equality_candidates: (uid) not indexed" errors in /var/log/syslog
  • Connect machines to LDAP over ldaps instead of ldap.
  • Disable non-SSL ldap
  • Migrate all local users on Infra machines to LDAP
  • Migrate all homedirs to Proxmox1
  • Maintain sudo'ers only through the LDAP and disable local root accounts (backdoor in case of emergency?)
  • Disable all relevant services on Nurdserver v1
  • Upgrade FusionDirectory from 1.0.4 to 1.0.5
  • Add all relevant fields of Wiki users to LDAP profiles (this will require Schema extending the schema) we shouldn't want this
  • Exclude weak ciphers from olcTLSCipherSuite in cn=config
  • Setting "change password on first login" in FusionDirectory doesn't get enforced through PAM
  • Create group 'wikiusers' in LDAP
  • Add already existing LDAP users to 'wikiusers' group
  • Upgrade FusionDirectory from 1.0.5 to 1.0.6
  • Set up VM to test the intended set-up (done on 192.168.1.223) -> Wiki_test_VM
  • Merge all unwanted users to user 'history' (running into a bug with some users)
  • Inform wiki users that will be renamed
  • Migrate/merge wiki users to LDAP
  • Create necessary wiki groups (bureaucrats, admins, other?) -> authorization is done in the wiki
  • Use LDAP as userdb back-end for wiki (like so)
  • Maintain Members page from LDAP (Like so, but this only displays 1 entry. Could be fixed like so.)
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