ldap double bind (rebind) problem

30 Jun 2009

      I run FreeRADIUS Version 2.0.5, for host i686-pc-linux-gnu and testing
FreeRADIUS Version 2.1.3 both on gentoo systems, I want to peap
authenticate, authorize and set VLANs on a Cisco Cat 4500 according to a
ldap Attribute.

* What does work already:
I can authenticate peap using certificates from an XP machine store as
well as from the user store.

Adding the machine and user to users file
DEFAULT Auth-Type := EAP, User-Password == ""
        Service-Type = Shell-User,
        Fall-Through = Yes,
        Tunnel-Type = 13,
        Tunnel-Medium-Type = 6
#        Tunnel-Private-Group-Id = 101
user@domain    Auth-Type := EAP, User-Password == ""
        Service-Type = Shell-User,
        Fall-Through = Yes,
        Tunnel-Type = 13,
        Tunnel-Medium-Type = 6,
        Tunnel-Private-Group-Id = 101

sets the VLAN correctly on the Cisco; removing user uses DEFAULT and
works as well when the Tunnel-Private-Group-Id is enabled.

* What does not work:
removing the users entry and setting up ldpa:

sites-enabled/MySite
authorize {
        preprocess
        mschap
        eap {
                ok = return
        }
        files
        Autz-Type LDAP1 {
                ldap_client1
        }
        ldap_client1
        expiration
        logintime
        pap
}
authenticate {
        Auth-Type PAP {
                pap
        }
        Auth-Type CHAP {
                chap
        }
        Auth-Type MS-CHAP {
                mschap
        }
        digest
        pam
        unix
       Auth-Type LDAP1{
               ldap_client1
       }
        eap
}

modules/ldap
ldap ldap_client1 {
        server = "ldapserver"
        identity = "cn=ldapuser,ou=users,...."
        password = "password"
        basedn = "dc=ad,..."
        dictionary_mapping = ${raddbdir}/ldap.attrmap
        filter = "(userPrincipalName=%{Stripped-User-Name:-%{User-Name}})"

        ldap_connections_number = 5
        timeout = 4
        timelimit = 3
        net_timeout = 1
        ldap_debug = 0xFFFF
}

ldap.attrmap
checkItem       Tunnel-Private-Group-Id         comment

My VLAN is in the comment Attribute:
ldapsearch -h ldaserver -b "dc=casedn" -D "ldapuser@ldaserver" -w
"password" -x '(userPrincipalName=user@domain)'  comment
--> .... comment: 101

Major problem in the debug:
new result:  res_errno: 1, res_error: <000004DC: LdapErr: DSID-0C0906DD,
comment: In order to perform this operation a successful bind must be
completed on the connection., data 0, v1772>, res_matched: <>
read1msg: ld 0x81c1068 0 new referrals

In tcpdump from ldapsearch there is one bind + one searchRequest
In tcpdump from radiusd there is one bind + one searchRequest with
searchResDone ... vals 101 - This is perfect. But right thereafter is an
anonymous bind which uses the searchResRef and issues the same query
again and fails, as it is not allowed for anonymous bind.

Is there any idea how to resolve this or how to use ldap differently.

Thanks
Joerg

ldap double bind (rebind) problem

Joerg Spatschil