stupid ldap

[ link: ldap-upgrade-to-2.3.23-brakage | tags: ldap linux debian | updated: Thu, 27 Jul 2006 12:50:09 ]

For some very stupid reason I decided to upgrade my fileserver, which happens to run my ldap database as well.

Setting up slapd (2.3.23-1) ...
  Backing up /etc/ldap/slapd.conf in /var/backups/slapd-2.2.26-5... done.
  Moving old database directories to /var/backups:

  Backup path /var/backups/dc=jukie-2.2.26-5.ldapdb exists. Giving up...
dpkg: error processing slapd (--configure):
 subprocess post-installation script returned error exit status 1
Errors were encountered while processing:
 slapd
E: Sub-process /usr/bin/dpkg returned an error code (1)

Frig!

Ehh, ok... so now what?

# cp /var/backups/slapd-2.2.26-5/dc\=jukie.ldif /etc/ldap/backup-20060612.ldif
# slapadd -l /etc/ldap/backup-20060612.ldif
bdb_db_open: Warning - No DB_CONFIG file found in directory /var/lib/ldap: (2)
Expect poor performance for suffix dc=jukie.
slapadd: dn="uid=root,ou=Users,dc=jukie" (line=111): (65) invalid structural object class chain (inetOrgPerson/account)
meson:/etc/ldap# man bdb_db_open
No manual entry for bdb_db_open

So it turns out that I used to use account as an objectClass, and for whatever reason you cannot mix that with inetOrgPerson. If you can, I have no idea how.

dn: uid=root,ou=Users,dc=jukie
objectClass: inetOrgPerson
objectClass: sambaSamAccount
objectClass: posixAccount
objectClass: shadowAccount
objectClass: account
gidNumber: 0
uid: root
uidNumber: 0
homeDirectory: /home/root
creatorsName: cn=admin,dc=jukie
loginShell: /bin/bash
...
host: alpha.jukie.net
host: beta.jukie.net

And the only reason I wanted to keep the account schema was for the host fields. I use these to filter accounts at machines. A host would only allow an account if the account contained the host: field with it's name. It's pretty simple:

# grep ^pam_filter /etc/pam_ldap.conf 
pam_filter |(host=alpha.jukie.net)(host=\*)

Note, the * indicates any host. My root account actually has a *, but I changed the example above to show the more interesting case.

After a bit of searching I found a suitable replacement called sambaUserWorkstations; here is the definition:

Here you can give a comma-separated list of machines on which the user is allowed to login. You may observe problems when you try to connect to a Samba domain member. Because domain members are not in this list, the domain controllers will reject them. Where this attribute is omitted, the default implies no restrictions.

sambaUserWorkstations is part of the sambaSamAccount objectClass which I already had. Good.

The only problem I found with it is that it does not permit this:

sambaUserWorkstations: alpha.jukie.net
sambaUserWorkstations: beta.jukie.net

...but this...

sambaUserWorkstations: alpha.jukie.net,beta.jukie.net

And that screws up my pam_filter. It should still work for my account because I have a * in the sambaUserWorkstations field but I have to figure out how to do partial matches for everyone that has access to multiple machines. And I would love to modify my schema to fix this but I am warned by OpenLDAP not to....

    Caution Caution
        You should not modify any of the schema items defined in the schema files installed by OpenLDAP. 

...TO BE CONTINUED.

Bart's Blog

/ldap-upgrade-to-2.3.23-brakage

About

I am an embedded Linux software developer and consultant operating under Jukie Networks Inc in Ottawa, Canada.

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first post!





Bart Trojanowski
http://www.jukie.net/~bart
bart@jukie.net