This page is for working out the migration of UCC authentication to LDAP.

Current status

OpenLDAP servers set up on mussel (master) and martello (replica) under the DN dc=ucc,dc=gu,dc=uwa,dc=edu,dc=au. All machines are pointing to mussel, most to martello as well.

The original Sun LDAP server on manbo which was used to init the database is still around, but not being used. TableOfContents

Configuration Details

OpenLDAP is configured in /etc/ldap/slapd.conf in a near-defeault configuration, with the exception of using smbk5pwd, ppolicy and syncprov overlays. There's no fancy console thing, but there's other tools you can use, like GQ and LBE. Admin password available upon application to [TRS]. Data is stored in /var/lib/ldap, and there's a syncagent for martello and a proxyagent for the suns.

On manbo, the server root is /var/mps/serverroot, /usr/sbin/directoryserver startconsole starts the managery console thing.

Referrals to UWA

dc=uwa,dc=edu,dc=au goes to ldap://directory.uwa.edu.au:389/o=The%20University%20of%20Western%20Australia eg: ldapsearch -C -x -h manbo -b dc=uwa,dc=edu,dc=au '(cn=Alex Dawson)' also works on mussel.

To Do

• initialize OU entries - done
• load user data from nis and samba - done
• New user creation script, run on manbo?, can use either:

  • [http://cpu.sourceforge.net/ cpu] and smbpasswd

  • smbldap-tools.

  • initial version in /home/wheel/bin/ucc-adduser.ldap, to be used on mussel.

• test password changing - successful
• SSL - our own CA or pay for a cert? our own, investigate free certs for *.uwa.edu.au
• Replication? between mussel and martello - done

• Bonus crack - user address book, see (minimally functional) demo at https://mussel.ucc.asn.au/contagged-0.5

• Enable LPK on sshds.

User objectClasses

• Structural
  • inetOrgPerson
• Auxiliary
  • sambaSamAccount
  • shadowAccount

Attribute Abuse

• Stick dovecot mail_location in preferredDeliveryMethod - done
• Stick coke balance into directory, use RFC 4527 methods to update

Client configuration

• libnss-ldap
• libpam-ldap

All clients are using SSL, with a copy of the UCC CA which is run from mooneye:/etc/ssl/CA.pl. CAs are managed on Solaris and Tru64 using certutil.

Solaris LDAP clients

Arrgh the documentation is not very clear about what's going on until you already understand it, particularly if you come from an OpenLDAP backgroud.

Basically, instead of binding as the user to the server, the client somehow magically binds with a proxy agent (which doesn't need read access to the user's password mind) and then authenticates the user. So binding as anonymous won't work, since anonymous can't actually bind to the server in a fashion that allows later authentication. Fortunately idsconfig will create the proxy user for you, but you have to understand that you want one first. The exception is if you have SASL/GSSAPI set up, but I think that means you're running kerberos, which we're not.

So, to set up a solaris client, run ldapclient -v init -a proxyDN=cn=proxyagent,ou=profile,dc=ucc,dc=gu,dc=uwa,dc=edu,dc=au 130.95.13.7, edit /etc/nsswitch.conf and replace the hosts: entry with files dns, then add in pam_ldap.so.1 to /etc/pam.conf as detailed [http://www.opensolaris.org/jive/thread.jspa?threadID=23434 here] or in pam_ldap(4). For googlejuice - this may show itself as the error pam_ldap: no legal authentication method configured

Notes on Sun Directory Server and other LDAP servers

The Sun LDAP server supports several private LDAP control OIDs (1.3.6.1.4.1.42.2.27.9.5.8, 2.16.840.1.113730.3.4.4 and 2.16.840.1.113730.3.4.5) for the proxy account to obtain account validity information before attempting authentication. If these controls are available, the proxy account doesn't need read access to userPassword, which is good from a security point of view. Unforunately Sun DS doesn't support the LDAP Password Modifiy Extended Operation (defined as 1.3.6.1.4.1.4203.1.11.1 in [http://www.faqs.org/rfcs/rfc3062.html RFC 3062]) which PADL libpam_ldap and samba both use to change unix passwords.

In theory the extensions could be added, but even [http://www.directorymanager.org/blogs/ldap_controls.html Sun] admits the [http://cvs.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/lib/libsldap/common/ns_sldap.h#312 header files] is all documentation there is. At least opensolaris being free software lets us read the client source to understand why it's not working. Plus the RFC-track password policy seems to do all the private controls do and more. Further testing indicates it actually does work, and ssh keys can be made to work by just skipping libpam_ldap.so in /etc/pam.conf with a specific sshd-keygen account sections.

So what about Fedora DS? Being a fork of iPlanet, it's very similar to SunDS, including being just as painful as Sun DS to install under Linux, so no real gain there. Plus, it's being converted to FHS at the moment, so we'd just have to reinstall anyway. The documentation is also a little lackluster. Finally, it doesn't support 1.3.6.1.4.1.42.2.27.9.5.8 (which was only [http://opensolaris.org/jive/thread.jspa?threadID=614&tstart=0 added to SunDS recently] so ssh keys wouldn't work with libpam_ldap.so, not that that's actually a problem.

Useful URLs

http://lists.samba.org/archive/samba/2005-March/101579.html BR http://www.unav.es/cti/ldap-smb/smb-ldap-3-howto.html BR http://samba.org/samba/docs/man/Samba-Guide/happy.html BR http://www.samba.org/samba/docs/man/Samba-HOWTO-Collection/passdb.html BR http://www.nabble.com/anonymous-binding---is-it-needed---t1261737.html BR http://groups.google.com/group/comp.unix.solaris/msg/10e8a62bad96f288 BR [http://docs.sun.com/app/docs/doc/816-4556/6maort2to?a=view Solaris offers a nis server syncing from LDAP] BR [http://www.zytrax.com/books/ldap/ LDAP for Rocket Scientists], easily the most comprehensive of the readable LDAP guides