OpenLDAP check item

12 May 2009

      Hi All,

I want to use FreeRadius to administer network equipement. I use also OpenLDAP to stock information about users. FreeRADIUS and OpenLDAP are installed on the same server FreeBSD 7.0.
I contact a Network equipement (like catalyst cisco 2950 v12.1) with putty (ssh/telnet).

To resume :

Windows XP -> ssh or telnet -> Cisco 2950 (client radius/authenticator/NAS) -> EAPoRadius (I suppose) -> FreeRADIUS & OpenLDAP

For the moment, I don't install/configure supplicant on the Windows XP, I don't know if it's require because I don't want to use FreeRADIUS to auhtenticate my Windows session. I have an active directory to do this.

I configure slapd.conf, radius.conf, clients.conf, module ldap etc ... and it's works. And now I would like to add some check-item like NAS-IP-Address and Caliing-Station-ID. But I don't succeed :s, I use checkval to do this.

I have 2 questions :

-          Why my calling-station-id in the request is a IP and not a MAC ?

-          When I authenticate on the cisco 2950, I have in my log « rlm_checkval: Item Name: NAS-IP-Address, Value: À¨ » instead of 192.168.0.50, what is the problem ???

I think I have numerous problem, If you see one of them, could you inform me ? I am a novice with freeradius (and openldap also :s ). I could give you all information you need to help me to fix my problem.

Thanks for your help,

Regards

Francçois MEHAULT

On my cisco 2950 :

aaa new-model
aaa authentication login default local group radius
aaa authorization exec default group radius local
aaa authorization network default group radius

My ldap.attrmap :

checkItem       Calling-Station-Id              radiusCallingStationId
checkItem       NAS-IP-Address                  radiusNASIpAddress

Extract of my openldap :

dn: cn=Francois MEHAULT,ou=Utilisateurs,dc=netplus,dc=fr

givenName:: RnJhbsOnb2lz

sn: MEHAULT

uid: fmehault

cn: Francois MEHAULT

homeDirectory: /home/admins/fmehault

loginShell: /usr/local/bin/zsh

gidNumber: 1203

uidNumber: 1203

objectClass: inetOrgPerson

objectClass: posixAccount

objectClass: top

objectClass: radiusprofile

radiusGroupName: stagiaire

radiusCallingStationId: 192.168.0.80   -> I put a IP address and not a Mac address because in the request it's a IP and not a mac, I don't know why...

radiusNASIpAddress: 192.168.0.60   -> in fact, the NAS IP is 192.168.0.50, but I put .60 to have Access-Reject

userPassword: {SSHA}tOoPUvtVW5O3+StoxScmQLiGFTO5l/+z

<12:34>[labobe2:~]# radiusd -X
FreeRADIUS Version 2.1.4, for host i386-portbld-freebsd7.0, built on Apr 16 2009 at 12:03:36
Copyright (C) 1999-2008 The FreeRADIUS server project and contributors.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
[...]
radiusd: #### Loading Clients ####
 client 192.168.0.50 {
        require_message_authenticator = no
        secret = "cherche"
        shortname = "swlabo"
        nastype = "cisco"
 }
radiusd: #### Instantiating modules ####
[...]
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_ldap
 Module: Instantiating ldap
  ldap {
        server = "127.0.0.1"
        port = 389
        password = "secret"
        identity = "cn=root,dc=netplus,dc=fr"
        net_timeout = 1
        timeout = 4
        timelimit = 3
        tls_mode = no
        start_tls = no
        tls_require_cert = "allow"
   tls {
        start_tls = no
        require_cert = "allow"
   }
        basedn = "dc=netplus,dc=fr"
        filter = "(uid=%{Stripped-User-Name:-%{User-Name}})"
        base_filter = "(objectclass=radiusprofile)"
        auto_header = no
        access_attr_used_for_allow = yes
        groupname_attribute = "cn"
        groupmembership_filter = "(|(&(objectClass=GroupOfNames)(member=%{control:Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{control:Ldap-UserDn})))"
        groupmembership_attribute = "radiusGroupName"
        dictionary_mapping = "/usr/local/etc/raddb/ldap.attrmap"
        ldap_debug = 0
        ldap_connections_number = 5
        compare_check_items = no
        do_xlat = yes
        set_auth_type = yes
  }
rlm_ldap: Registering ldap_groupcmp for Ldap-Group
[...]
rlm_ldap: LDAP radiusVSA mapped to RADIUS Cisco-AVPair
conns: 0x2852c240
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_preprocess
 Module: Instantiating preprocess
  preprocess {
        huntgroups = "/usr/local/etc/raddb/huntgroups"
        hints = "/usr/local/etc/raddb/hints"
        with_ascend_hack = no
        ascend_channels_per_line = 23
        with_ntdomain_hack = no
        with_specialix_jetstream_hack = no
        with_cisco_vsa_hack = no
        with_alvarion_vsa_hack = no
  }
 Module: Linked to module rlm_checkval
 Module: Instantiating station-check
  checkval station-check {
        item-name = "Calling-Station-Id"
        check-name = "Calling-Station-Id"
        data-type = "string"
        notfound-reject = no
  }
rlm_checkval: Registered name Calling-Station-Id for attribute 31
 Module: Instantiating nas-check
  checkval nas-check {
        item-name = "NAS-IP-Address"
        check-name = "NAS-IP-Address"
        data-type = "ipaddr"
        notfound-reject = no
  }
rlm_checkval: Registered name NAS-IP-Address for attribute 4
 Module: Checking preacct {...} for more modules to load
 Module: Linked to module rlm_acct_unique
 Module: Instantiating acct_unique
  acct_unique {
        key = "User-Name, Acct-Session-Id, NAS-IP-Address, Client-IP-Address, NAS-Port"
  }
 Module: Checking accounting {...} for more modules to load
 Module: Linked to module rlm_detail
 [...]

Then I launch my putty and log on the cisco :

rad_recv: Access-Request packet from host 192.168.0.50 port 1812, id=117, length=80
        NAS-IP-Address = 192.168.0.50
        NAS-Port = 1
        NAS-Port-Type = Virtual
        User-Name = "fmehault"
        Calling-Station-Id = "192.168.0.80"      -->  it's not a MAC address, why ???
        User-Password = "toto"
+- entering group authorize {...}
++[preprocess] returns ok
[...]
 [ldap] WARNING: Deprecated conditional expansion ":-".  See "man unlang" for details
[ldap]  expand: (uid=%{Stripped-User-Name:-%{User-Name}}) -> (uid=fmehault)
[ldap]  expand: dc=netplus,dc=fr -> dc=netplus,dc=fr
rlm_ldap: ldap_get_conn: Checking Id: 0
rlm_ldap: ldap_get_conn: Got Id: 0
rlm_ldap: performing search in dc=netplus,dc=fr, with filter (uid=fmehault)
rlm_ldap: performing search in cn=stagiaire,ou=Profiles,dc=netplus,dc=fr, with filter (objectclass=radiusprofile)
rlm_ldap: radiusServiceType -> Service-Type = NAS-Prompt-User
[ldap] looking for check items in directory...
rlm_ldap: radiusNASIpAddress -> NAS-IP-Address == 192.168.0.60
rlm_ldap: radiusCallingStationId -> Calling-Station-Id == "192.168.0.80"
[ldap] looking for reply items in directory...
WARNING: No "known good" password was found in LDAP.  Are you sure that the user is configured correctly?
[ldap] Setting Auth-Type = LDAP
[ldap] user fmehault authorized to use remote access
rlm_ldap: ldap_release_conn: Release Id: 0
++[ldap] returns ok
rlm_checkval: Item Name: Calling-Station-Id, Value: 192.168.0.80
rlm_checkval: Value Name: Calling-Station-Id, Value: 192.168.0.80
++[station-check] returns ok
rlm_checkval: Item Name: NAS-IP-Address, Value: À¨     --> what is the problem ???
rlm_checkval: Value Name: NAS-IP-Address, Value: 192.168.0.60   (I put 192.168.0.60 instead of 192.168.0.50 to be reject )
[...]
Sending Access-Accept of id 117 to 192.168.0.50 port 1812
        Reply-Message = "Utilisateur: fmehault, group: Stagiaire"
        Service-Type = NAS-Prompt-User
Finished request 0.
Going to the next request
Waking up in 4.9 seconds.
Cleaning up request 0 ID 117 with timestamp +237
Ready to process requests.

OpenLDAP check item

François Mehault