Greetings,

I'm new to OpenLDAP and am trying to implement the following:

User authentication (PAM + SSSD) on CentOS Linux servers via OpenLDAP proxy to Active Directory. I am able to perform the following search from the OpenLDAP proxy without any apparent issues:

[root@openldap ~]# ldapsearch -x -h mydomaincontroller -LLL -b dc=msad,dc=inet,dc=com -D cn=ldap,cn=users,dc=msad,dc=inet,dc=com -W '(sAMAccountName=jonathanv)' cn sAMAccountName

Enter LDAP Password:
dn: CN=jonathan,CN=Users,DC=msad,DC=inet,DC=com
cn: jonathan
sAMAccountName: jonathanv

# refldap://ForestDnsZones.msad.inet.com/DC=ForestDnsZones,DC=msad,DC=inet,DC=com

# refldap://DomainDnsZones.msad.inet.com/DC=DomainDnsZones,DC=msad,DC=inet,DC=com

# refldap://msad.inet.com/CN=Configuration,DC=msad,DC=inet,DC=com

However, when asking the OpenLDAP proxy:

[root@openldap ~]# ldapsearch -x -h localhost -LLL -b dc=msad,dc=inet,dc=com -D cn=ldap,cn=users,dc=msad,dc=inet,dc=com -W '(sAMAccountName=jonathanv)' cn sAMAccountName

Enter LDAP Password:
# refldap://ForestDnsZones.msad.inet.com/DC=ForestDnsZones,DC=msad,DC=inet,DC=com

# refldap://DomainDnsZones.msad.inet.com/DC=DomainDnsZones,DC=msad,DC=inet,DC=com

# refldap://msad.inet.com/CN=Configuration,DC=msad,DC=inet,DC=com

Also, I've configured my CentOS server's using SSSD. When trying to authenticate as user jonathanv, I receive a message that user jonathanv is not found.

I am using OpenLDAP server version 2.4.23-20.

I am starting the OpenLDAP from the command line as follows:

slapd -f -d 2 -f /etc/openldap/slapd.conf -g ldap -h ldap:/// -l LOCAL4 -u ldap -n slapd-ldap

Here is the output of my slapd.conf file:

#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#

include        /etc/openldap/schema/corba.schema
include        /etc/openldap/schema/core.schema
include        /etc/openldap/schema/cosine.schema
include        /etc/openldap/schema/duaconf.schema
include        /etc/openldap/schema/dyngroup.schema
include        /etc/openldap/schema/inetorgperson.schema
include        /etc/openldap/schema/java.schema
include        /etc/openldap/schema/misc.schema
include        /etc/openldap/schema/nis.schema
include        /etc/openldap/schema/openldap.schema
include        /etc/openldap/schema/ppolicy.schema
include        /etc/openldap/schema/collective.schema

# Allow LDAPv2 client connections.  This is NOT the default.
allow bind_v2

# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral    ldap://root.openldap.org

pidfile        /var/run/openldap/slapd.pid
argsfile    /var/run/openldap/slapd.args

# Load dynamic backend modules
# - modulepath is architecture dependent value (32/64-bit system)
# - back_sql.la overlay requires openldap-server-sql package
# - dyngroup.la and dynlist.la cannot be used at the same time

# modulepath /usr/lib/openldap
# modulepath /usr/lib64/openldap

# moduleload accesslog.la
# moduleload auditlog.la
# moduleload back_sql.la
# moduleload chain.la
# moduleload collect.la
# moduleload constraint.la
# moduleload dds.la
# moduleload deref.la
# moduleload dyngroup.la
# moduleload dynlist.la
# moduleload memberof.la
# moduleload pbind.la
# moduleload pcache.la
# moduleload ppolicy.la
# moduleload refint.la
# moduleload retcode.la
moduleload rwm.la
# moduleload seqmod.la
# moduleload smbk5pwd.la
# moduleload sssvlv.la
# moduleload syncprov.la
# moduleload translucent.la
# moduleload unique.la
# moduleload valsort.la

# The next three lines allow use of TLS for encrypting connections using a
# dummy test certificate which you can generate by changing to
# /etc/pki/tls/certs, running "make slapd.pem", and fixing permissions on
# slapd.pem so that the ldap user or group can read it.  Your client software
# may balk at self-signed certificates, however.
# TLSCACertificateFile /etc/pki/tls/certs/ca-bundle.crt
# TLSCertificateFile /etc/pki/tls/certs/slapd.pem
# TLSCertificateKeyFile /etc/pki/tls/certs/slapd.pem

# Sample security restrictions
#    Require integrity protection (prevent hijacking)
#    Require 112-bit (3DES or better) encryption for updates
#    Require 63-bit encryption for simple bind
# security ssf=1 update_ssf=112 simple_bind=64

# Sample access control policy:
#    Root DSE: allow anyone to read it
#    Subschema (sub)entry DSE: allow anyone to read it
#    Other DSEs:
#        Allow self write access
#        Allow authenticated users read access
#        Allow anonymous users to authenticate
#    Directives needed to implement policy:
# access to dn.base="" by * read
# access to dn.base="cn=Subschema" by * read
# access to *
#    by self write
#    by users read
#    by anonymous auth
#
# if no access controls are present, the default policy
# allows anyone and everyone to read anything but restricts
# updates to rootdn.  (e.g., "access to * by * read")
#
# rootdn can always read and write EVERYTHING!

# enable on-the-fly configuration (cn=config)
database config
access to *
    by dn.exact="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" manage
    by * none

# enable server status monitoring (cn=monitor)
database monitor
access to *
    by dn.exact="gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth" read
        by dn.exact="cn=Manager,dc=my-domain,dc=com" read
        by * none

#######################################################################
# database definitions
#######################################################################
database    bdb
suffix        "dc=inet,dc=local"
checkpoint    1024 15
rootdn        "cn=Manager,dc=inet,dc=local"
rootpw        xxxxxxxxxxxxxxxx

# Cleartext passwords, especially for the rootdn, should
# be avoided.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
# rootpw        secret
# rootpw        {crypt}ijFYNcSNctBYg

# The database directory MUST exist prior to running slapd AND
# should only be accessible by the slapd and slap tools.
# Mode 700 recommended.
directory    /var/lib/ldap

# Indices to maintain for this database

index objectClass                       eq,pres
index ou,cn,mail,surname,givenname      eq,pres,sub
index uidNumber,gidNumber,loginShell    eq,pres
index uid,memberUid                     eq,pres,sub
index nisMapName,nisMapEntry            eq,pres,sub

# Our slapd-ldap back end to connect to AD

database        ldap
suffix          "dc=msad,dc=inet,dc=com"
#subordinate
rebind-as-user
uri             "ldap://172.16.132.253/"
chase-referrals        yes

overlay rwm
rwm-suffixmassage   dc=msad,dc=inet,dc=com
rwm-map     attribute         uid sAMAccountName
rwm-map     attribute       cn      cn
rwm-map     attribute       displayName      displayName
rwm-map     attribute       givenName      givenName
rwm-map     attribute       sn      sn
rwm-map     attribute       mail    mail
rwm-map     attribute       userPassword      userPassword
rwm-map attribute  *
rwm-map objectclass inetOrgPerson user

# Replicas of this database
#replogfile /var/lib/ldap/openldap-master-replog
#replica host=ldap-1.example.com:389 starttls=critical
#     bindmethod=sasl saslmech=GSSAPI
#     authcId=host/ldap-master.example.com@EXAMPLE.COM
#

Any ideas as to why I'm unable to authenticate my user against the AD? Any advice or info on this topic would be greatly appreciated.

Greetings,

Jonathan


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