[Samba] Re: Idmap backend for winbind

[Josh T]

Wong, G. MR EECS wrote:
> I'm trying to set up an Idmap Backend LDAP server for winbind.  I don't
> need a full blown SAMBA PDC; just a server to provide the SID to UID/GID
> mappings.  We're using a Windows Active Directory server to authenticate
> against but we want the above mappings to be the same across multiple
> samba machines.  Can we just stand up a simple ldap server and just add
> the mappings
> and that's it or do we have to have a full blown Samba PDC for this
> purpose?  If just the mappings are built, what are the specifics?  What
> entries do we have to add?  All the documentation I've read talks about
> an idmap backend in the context of building a PDC.

I just set this up on Debian Stable - here's what I did from my notes - 
adjust for how your OS installs openldap, etc (my ADS domain is 
MYDOMAIN.LOCAL & samba was already correctly working as an ADS member 
with a local winbindd_ipmap.tdb):

Install "slapd" & "ldap-utils" packages from backports.org (OpenLDAP 2.1)
Configuring slapd (debconf "wizard")
	DNS domain name: mydomain.local
	name of org: company (?)
	Admin password: ****
	Allow LDAPv2: No

Copy samba.schema.gz to /etc/ldap/schema & gunzip.
Edit /etc/ldap/slapd.conf to include samba.schema

Edit /etc/samba/smb.conf
smbpasswd -w **** - enter LDAP admin password

made Idmap OU with Java LDAP Browser while testing - don't know if samba 
can make this automatically?

I think you might have to delete winbindd_idmap.tdb?

I then set it up to use SSL after it was working.  Ignore the last three 
lines of slapd.conf & use "ldap ssl = off" and "idmap backend = 
ldap:ldap://ipaddress" in smb.conf to not use SSL.

This is probably very Debian specific, but hope it helps,
Josh

	
 From /etc/samba/smb.conf:
[global]
         workgroup = MYDOMAIN
         netbios name = MAIL1
         security = ADS
         realm = MYDOMAIN.LOCAL
         encrypt passwords = true
         password server = DC1.MYDOMAIN.LOCAL
         hosts allow = 192.168.0. 127.
         log file = /var/log/samba/log.%m
         log level = 0
         winbind separator = +
         winbind uid = 10000-20000
         winbind gid = 10000-20000
         winbind enum users = yes
         winbind enum groups = yes
         winbind use default domain = yes

         #testing ldap idmap backend
         ldap admin dn = cn=admin,dc=mydomain,dc=local
         ldap ssl = on
         ldap suffix = dc=mydomain,dc=local
         idmap backend = ldap:ldaps://127.0.0.1
         ldap idmap suffix = ou=Idmap




File /etc/ldap/slapd.conf:
# This is the main slapd configuration file. See slapd.conf(5) for more
# info on the configuration options.

#######################################################################
# Global Directives:

# Features to permit
#allow bind_v2

# Schema and objectClass definitions
include         /etc/ldap/schema/core.schema
include         /etc/ldap/schema/cosine.schema
include         /etc/ldap/schema/nis.schema
include         /etc/ldap/schema/inetorgperson.schema
include         /etc/ldap/schema/samba.schema

# Schema check allows for forcing entries to
# match schemas for their objectClasses's
schemacheck     on

# Where the pid file is put. The init.d script
# will not stop the server if you change this.
pidfile         /var/run/slapd/slapd.pid

# List of arguments that were passed to the server
argsfile        /var/run/slapd.args

# Read slapd.conf(5) for possible values
loglevel        0

# Where the dynamically loaded modules are stored
modulepath      /usr/lib/ldap
moduleload      back_bdb

#######################################################################
# Specific Backend Directives for bdb:
# Backend specific directives apply to this backend until another
# 'backend' directive occurs
backend         bdb

#######################################################################
# Specific Backend Directives for 'other':
# Backend specific directives apply to this backend until another
# 'backend' directive occurs
#backend                <other>

#######################################################################
# Specific Directives for database #1, of type bdb:
# Database specific directives apply to this databasse until another
# 'database' directive occurs
database        bdb

# The base of your directory in database #1
suffix          "dc=mydomain,dc=local"

# Where the database file are physically stored for database #1
#directory       "/var/lib/ldap"
directory       "/mnt/shared/ldap"

# Indexing options for database #1
index           objectClass eq

# Save the time that the entry gets modified, for database #1
lastmod         on

# Where to store the replica logs for database #1
# replogfile    /var/lib/ldap/replog

# The userPassword by default can be changed
# by the entry owning it if they are authenticated.
# Others should not be able to see it, except the
# admin entry below
# These access lines apply to database #1 only
access to attribute=userPassword
         by dn="cn=admin,dc=mydomain,dc=local" write
         by anonymous auth
         by self write
         by * none

# Ensure read access to the base for things like
# supportedSASLMechanisms.  Without this you may
# have problems with SASL not knowing what
# mechanisms are available and the like.
# Note that this is covered by the 'access to *'
# ACL below too but if you change that as people
# are wont to do you'll still need this if you
# want SASL (and possible other things) to work
# happily.
access to dn.base="" by * read

# The admin dn has full write access, everyone else
# can read everything.
access to *
         by dn="cn=admin,dc=mydomain,dc=local" write
         by * read

# For Netscape Roaming support, each user gets a roaming
# profile for which they have write access to
#access to dn=".*,ou=Roaming,o=morsnet"
#        by dn="cn=admin,dc=mydomain,dc=local" write
#        by dnattr=owner write

#######################################################################
# Specific Directives for database #2, of type 'other' (can be bdb too):
# Database specific directives apply to this databasse until another
# 'database' directive occurs
#database        <other>

# The base of your directory for database #2
#suffix         "dc=debian,dc=org"

TLSCACertificateFile    /etc/ssl/certs/openldap.pem
TLSCertificateFile      /etc/ssl/certs/openldap.pem
TLSCertificateKeyFile   /etc/ssl/certs/openldap.pem