Authentification Problem with Cisco AP, freeradius and LDAP

11 Oct 2012

      Hello,

i have got a realy annoing authentification problem and i would be glad if
you could help me.

I use a Cisco Aironet 1130ag Access Point, the radius-server is a Debian
Squeeze (6.0.5) and i installed FreeRadius Version 2.1.10 from the packet
sources.

After i made some changes to the /etc/freeradius/modules/ldap to let my
radius know where the LDAP is and some other things it looks like this:

---------->  /etc/freeradius/modules/ldap
ldap {

        server      = 172.26.100.1
        identity    = "uid=binduser,cn=users,ou=
Infrastruktur,dc=tarent,dc=de"
        password    = xxxxxxxx
        basedn      = "dc=tarent,dc=de"
        filter      = "(uid=%{%{Stripped-User-Name}:-%{User-Name}})"
        base_filter = "(objectclass=posixAccount)"

        groupname_attribute         = cn

      # groupmembership_filter      =
"(|(&(objectClass=GroupOfNames)(member=%{control:Ldap-UserDn}))(&(objectClass=GroupOfUniqueNames)(uniquemember=%{control:Ldap-UserDn})))"
        groupmembership_filter      =
"(&(objectClass=posixGroup)(memberUid=%{%{Stripped-User-Name}:-%{User-Name}}))"

      # groupmembership_attribute   = radiusGroupName
        groupmembership_attribute   = WLAN

      # compare_check_items         = yes
      # do_xlat                     = yes
      # access_attr_used_for_allow  = yes

        dictionary_mapping = /etc/freeradius/ldap.attrmap
        password_attribute = CleartextPassword
        set_auth_type      = yes
     }

when i start the freeradius with freeradius -X this is the output i get:

FreeRADIUS Version 2.1.10, for host x86_64-pc-linux-gnu, built on Sep 11
2012 at 17:06:46
Copyright (C) 1999-2009 The FreeRADIUS server project and contributors.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
You may redistribute copies of FreeRADIUS under the terms of the
GNU General Public License v2.
Starting - reading configuration files ...
including configuration file /etc/freeradius/radiusd.conf
including configuration file /etc/freeradius/proxy.conf
including configuration file /etc/freeradius/clients.conf
including files in directory /etc/freeradius/modules/
including configuration file /etc/freeradius/modules/attr_rewrite
including configuration file /etc/freeradius/modules/sradutmp
including configuration file /etc/freeradius/modules/expr
including configuration file /etc/freeradius/modules/opendirectory
including configuration file /etc/freeradius/modules/dynamic_clients
including configuration file /etc/freeradius/modules/chap
including configuration file /etc/freeradius/modules/detail
including configuration file
/etc/freeradius/modules/sqlcounter_expire_on_login
including configuration file /etc/freeradius/modules/exec
including configuration file /etc/freeradius/modules/linelog
including configuration file /etc/freeradius/modules/ntlm_auth
including configuration file /etc/freeradius/modules/preprocess
including configuration file /etc/freeradius/modules/detail.log
including configuration file /etc/freeradius/modules/expiration
including configuration file /etc/freeradius/modules/acct_unique
including configuration file /etc/freeradius/modules/logintime
including configuration file /etc/freeradius/modules/smsotp
including configuration file /etc/freeradius/modules/echo
including configuration file /etc/freeradius/modules/always
including configuration file /etc/freeradius/modules/etc_group
including configuration file /etc/freeradius/modules/detail.example.com
including configuration file /etc/freeradius/modules/mac2ip
including configuration file /etc/freeradius/modules/policy
including configuration file /etc/freeradius/modules/attr_filter
including configuration file /etc/freeradius/modules/digest
including configuration file /etc/freeradius/modules/mschap
including configuration file /etc/freeradius/modules/mac2vlan
including configuration file /etc/freeradius/modules/krb5
including configuration file /etc/freeradius/modules/radutmp
including configuration file /etc/freeradius/modules/unix
including configuration file /etc/freeradius/modules/realm
including configuration file /etc/freeradius/modules/inner-eap
including configuration file /etc/freeradius/modules/wimax
including configuration file /etc/freeradius/modules/passwd
including configuration file /etc/freeradius/modules/cui
including configuration file /etc/freeradius/modules/counter
including configuration file /etc/freeradius/modules/ldap
including configuration file /etc/freeradius/modules/files
including configuration file /etc/freeradius/modules/checkval
including configuration file /etc/freeradius/modules/pap
including configuration file /etc/freeradius/modules/perl
including configuration file /etc/freeradius/modules/pam
including configuration file /etc/freeradius/modules/smbpasswd
including configuration file /etc/freeradius/modules/otp
including configuration file /etc/freeradius/modules/ippool
including configuration file /etc/freeradius/modules/sql_log
including configuration file /etc/freeradius/eap.conf
including configuration file /etc/freeradius/policy.conf
including files in directory /etc/freeradius/sites-enabled/
including configuration file /etc/freeradius/sites-enabled/inner-tunnel
including configuration file /etc/freeradius/sites-enabled/default
main {
        user = "freerad"
        group = "freerad"
        allow_core_dumps = no
}
including dictionary file /etc/freeradius/dictionary
main {
        prefix = "/usr"
        localstatedir = "/var"
        logdir = "/var/log/freeradius"
        libdir = "/usr/lib/freeradius"
        radacctdir = "/var/log/freeradius/radacct"
        hostname_lookups = no
        max_request_time = 30
        cleanup_delay = 5
        max_requests = 1024
        pidfile = "/var/run/freeradius/freeradius.pid"
        checkrad = "/usr/sbin/checkrad"
        debug_level = 0
        proxy_requests = no
 log {
        stripped_names = no
        auth = yes
        auth_badpass = no
        auth_goodpass = no
 }
 security {
        max_attributes = 200
        reject_delay = 1
        status_server = yes
 }
}
radiusd: #### Loading Realms and Home Servers ####
 proxy server {
        retry_delay = 5
        retry_count = 3
        default_fallback = no
        dead_time = 120
        wake_all_if_all_dead = no
 }
 home_server localhost {
        ipaddr = 127.0.0.1
        port = 1812
        type = "auth"
        secret = "testing123"
        response_window = 20
        max_outstanding = 65536
        require_message_authenticator = yes
        zombie_period = 40
        status_check = "status-server"
        ping_interval = 30
        check_interval = 30
        num_answers_to_alive = 3
        num_pings_to_alive = 3
        revive_interval = 120
        status_check_timeout = 4
        irt = 2
        mrt = 16
        mrc = 5
        mrd = 30
 }
 home_server_pool my_auth_failover {
        type = fail-over
        home_server = localhost
 }
 realm example.com {
        auth_pool = my_auth_failover
 }
 realm LOCAL {
 }
radiusd: #### Loading Clients ####
 client localhost {
        ipaddr = 127.0.0.1
        require_message_authenticator = no
        secret = "testing123"
        nastype = "other"
 }
 client man-netz {
        ipaddr = 10.10.20.0
        netmask = 23
        require_message_authenticator = no
        secret = "testing123"
        nastype = "cisco"
 }
radiusd: #### Instantiating modules ####
 instantiate {
 Module: Linked to module rlm_exec
 Module: Instantiating module "exec" from file /etc/freeradius/modules/exec
  exec {
        wait = no
        input_pairs = "request"
        shell_escape = yes
  }
 Module: Linked to module rlm_expr
 Module: Instantiating module "expr" from file /etc/freeradius/modules/expr
 Module: Linked to module rlm_expiration
 Module: Instantiating module "expiration" from file
/etc/freeradius/modules/expiration
  expiration {
        reply-message = "Password Has Expired  "
  }
 Module: Linked to module rlm_logintime
 Module: Instantiating module "logintime" from file
/etc/freeradius/modules/logintime
  logintime {
        reply-message = "You are calling outside your allowed timespan  "
        minimum-timeout = 60
  }
 }
radiusd: #### Loading Virtual Servers ####
server { # from file /etc/freeradius/radiusd.conf
 modules {
 Module: Checking authenticate {...} for more modules to load
 Module: Linked to module rlm_mschap
 Module: Instantiating module "mschap" from file
/etc/freeradius/modules/mschap
  mschap {
        use_mppe = yes
        require_encryption = no
        require_strong = no
        with_ntdomain_hack = yes
  }
 Module: Linked to module rlm_ldap
 Module: Instantiating module "ldap" from file /etc/freeradius/modules/ldap
  ldap {
        server = "172.26.100.1"
        port = 389
        password = "AhRohr7Z"
        identity = "uid=binduser,cn=users,ou=Infrastruktur,dc=tarent,dc=de"
        net_timeout = 10
        timeout = 20
        timelimit = 20
        tls_mode = no
        start_tls = no
        tls_require_cert = "allow"
        basedn = "dc=tarent,dc=de"
        filter = "(uid=%{%{Stripped-User-Name}:-%{User-Name}})"
        base_filter = "(objectclass=posixAccount)"
        password_attribute = "CleartextPassword"
        auto_header = no
        access_attr_used_for_allow = yes
        groupname_attribute = "cn"
        groupmembership_filter =
"(&(objectClass=posixGroup)(memberUid=%{%{Stripped-User-Name}:-%{User-Name}}))"
        groupmembership_attribute = "WLAN"
        dictionary_mapping = "/etc/freeradius/ldap.attrmap"
        ldap_debug = 0
        ldap_connections_number = 5
        compare_check_items = no
        do_xlat = yes
        edir_account_policy_check = yes
        set_auth_type = yes
  }
rlm_ldap: Registering ldap_groupcmp for Ldap-Group
rlm_ldap: Registering ldap_xlat with xlat_name ldap
rlm_ldap: reading ldap<->radius mappings from file
/etc/freeradius/ldap.attrmap
rlm_ldap: LDAP radiusCheckItem mapped to RADIUS $GENERIC$
rlm_ldap: LDAP radiusReplyItem mapped to RADIUS $GENERIC$
rlm_ldap: LDAP radiusAuthType mapped to RADIUS Auth-Type
rlm_ldap: LDAP radiusSimultaneousUse mapped to RADIUS Simultaneous-Use
rlm_ldap: LDAP radiusCalledStationId mapped to RADIUS Called-Station-Id
rlm_ldap: LDAP radiusCallingStationId mapped to RADIUS Calling-Station-Id
rlm_ldap: LDAP lmPassword mapped to RADIUS LM-Password
rlm_ldap: LDAP ntPassword mapped to RADIUS NT-Password
rlm_ldap: LDAP sambaLmPassword mapped to RADIUS LM-Password
rlm_ldap: LDAP sambaNtPassword mapped to RADIUS NT-Password
rlm_ldap: LDAP dBCSPwd mapped to RADIUS LM-Password
rlm_ldap: LDAP userPassword mapped to RADIUS Password-With-Header
rlm_ldap: LDAP acctFlags mapped to RADIUS SMB-Account-CTRL-TEXT
rlm_ldap: LDAP radiusExpiration mapped to RADIUS Expiration
rlm_ldap: LDAP radiusNASIpAddress mapped to RADIUS NAS-IP-Address
rlm_ldap: LDAP radiusServiceType mapped to RADIUS Service-Type
rlm_ldap: LDAP radiusFramedProtocol mapped to RADIUS Framed-Protocol
rlm_ldap: LDAP radiusFramedIPAddress mapped to RADIUS Framed-IP-Address
rlm_ldap: LDAP radiusFramedIPNetmask mapped to RADIUS Framed-IP-Netmask
rlm_ldap: LDAP radiusFramedRoute mapped to RADIUS Framed-Route
rlm_ldap: LDAP radiusFramedRouting mapped to RADIUS Framed-Routing
rlm_ldap: LDAP radiusFilterId mapped to RADIUS Filter-Id
rlm_ldap: LDAP radiusFramedMTU mapped to RADIUS Framed-MTU
rlm_ldap: LDAP radiusFramedCompression mapped to RADIUS Framed-Compression
rlm_ldap: LDAP radiusLoginIPHost mapped to RADIUS Login-IP-Host
rlm_ldap: LDAP radiusLoginService mapped to RADIUS Login-Service
rlm_ldap: LDAP radiusLoginTCPPort mapped to RADIUS Login-TCP-Port
rlm_ldap: LDAP radiusCallbackNumber mapped to RADIUS Callback-Number
rlm_ldap: LDAP radiusCallbackId mapped to RADIUS Callback-Id
rlm_ldap: LDAP radiusFramedIPXNetwork mapped to RADIUS Framed-IPX-Network
rlm_ldap: LDAP radiusClass mapped to RADIUS Class
rlm_ldap: LDAP radiusSessionTimeout mapped to RADIUS Session-Timeout
rlm_ldap: LDAP radiusIdleTimeout mapped to RADIUS Idle-Timeout
rlm_ldap: LDAP radiusTerminationAction mapped to RADIUS Termination-Action
rlm_ldap: LDAP radiusLoginLATService mapped to RADIUS Login-LAT-Service
rlm_ldap: LDAP radiusLoginLATNode mapped to RADIUS Login-LAT-Node
rlm_ldap: LDAP radiusLoginLATGroup mapped to RADIUS Login-LAT-Group
rlm_ldap: LDAP radiusFramedAppleTalkLink mapped to RADIUS
Framed-AppleTalk-Link
rlm_ldap: LDAP radiusFramedAppleTalkNetwork mapped to RADIUS
Framed-AppleTalk-Network
rlm_ldap: LDAP radiusFramedAppleTalkZone mapped to RADIUS
Framed-AppleTalk-Zone
rlm_ldap: LDAP radiusPortLimit mapped to RADIUS Port-Limit
rlm_ldap: LDAP radiusLoginLATPort mapped to RADIUS Login-LAT-Port
rlm_ldap: LDAP radiusReplyMessage mapped to RADIUS Reply-Message
rlm_ldap: LDAP radiusTunnelType mapped to RADIUS Tunnel-Type
rlm_ldap: LDAP radiusTunnelMediumType mapped to RADIUS Tunnel-Medium-Type
rlm_ldap: LDAP radiusTunnelPrivateGroupId mapped to RADIUS
Tunnel-Private-Group-Id
conns: 0x1c6dbf0
 Module: Linked to module rlm_eap
 Module: Instantiating module "eap" from file /etc/freeradius/eap.conf
  eap {
        default_eap_type = "md5"
        timer_expire = 60
        ignore_unknown_eap_types = no
        cisco_accounting_username_bug = no
        max_sessions = 4096
  }
 Module: Linked to sub-module rlm_eap_md5
 Module: Instantiating eap-md5
 Module: Linked to sub-module rlm_eap_leap
 Module: Instantiating eap-leap
 Module: Linked to sub-module rlm_eap_gtc
 Module: Instantiating eap-gtc
   gtc {
        challenge = "Password: "
        auth_type = "PAP"
   }
 Module: Linked to sub-module rlm_eap_tls
 Module: Instantiating eap-tls
   tls {
        rsa_key_exchange = no
        dh_key_exchange = yes
        rsa_key_length = 512
        dh_key_length = 512
        verify_depth = 0
        CA_path = "/etc/freeradius/certs"
        pem_file_type = yes
        private_key_file = "/etc/freeradius/certs/server.key"
        certificate_file = "/etc/freeradius/certs/server.pem"
        private_key_password = "3TBR4yYD1ok1Ki5H"
        dh_file = "/etc/freeradius/certs/dh"
        random_file = "/dev/urandom"
        fragment_size = 1024
        include_length = yes
        check_crl = yes
        check_cert_cn = "%{User-Name}"
        cipher_list = "DEFAULT"
        make_cert_command = "/etc/freeradius/certs/bootstrap"
    cache {
        enable = no
        lifetime = 24
        max_entries = 255
    }
    verify {
    }
   }
 Module: Linked to sub-module rlm_eap_ttls
 Module: Instantiating eap-ttls
   ttls {
        default_eap_type = "md5"
        copy_request_to_tunnel = no
        use_tunneled_reply = no
        include_length = yes
   }
 Module: Linked to sub-module rlm_eap_peap
 Module: Instantiating eap-peap
   peap {
        default_eap_type = "mschapv2"
        copy_request_to_tunnel = no
        use_tunneled_reply = no
        proxy_tunneled_request_as_eap = yes
        virtual_server = "inner-tunnel"
   }
 Module: Linked to sub-module rlm_eap_mschapv2
 Module: Instantiating eap-mschapv2
   mschapv2 {
        with_ntdomain_hack = yes
   }
 Module: Checking authorize {...} for more modules to load
 Module: Linked to module rlm_chap
 Module: Instantiating module "chap" from file /etc/freeradius/modules/chap
 Module: Checking post-auth {...} for more modules to load
 Module: Linked to module rlm_always
 Module: Instantiating module "fail" from file
/etc/freeradius/modules/always
  always fail {
        rcode = "fail"
        simulcount = 0
        mpp = no
  }
 } # modules
} # server
radiusd: #### Opening IP addresses and Ports ####
listen {
        type = "auth"
        ipaddr = *
        port = 0
}
listen {
        type = "acct"
        ipaddr = *
        port = 0
}
listen {
        type = "auth"
        ipaddr = *
        port = 1645
}
listen {
        type = "acct"
        ipaddr = *
        port = 1646
}
Listening on authentication address * port 1812
Listening on accounting address * port 1813
Listening on authentication address * port 1645
Listening on accounting address * port 1646
Ready to process requests.

I dont see any critical errors so i tried the radtest command.

------  radtest -x testuser password123 127.0.0.1 10 testing123
Sending Access-Request of id 247 to 127.0.0.1 port 1812
        User-Name = "testuser"
        User-Password = "password123"
        NAS-IP-Address = 10.10.20.36
        NAS-Port = 10
rad_recv: Access-Accept packet from host 127.0.0.1 port 1812, id=247,
length=20

------- radius output:
rad_recv: Access-Request packet from host 127.0.0.1 port 58762, id=247,
length=58
        User-Name = "testuser"
        User-Password = "password123"
        NAS-IP-Address = 10.10.20.36
        NAS-Port = 10
# Executing section authorize from file
/etc/freeradius/sites-enabled/inner-tunnel
+- entering group authorize {...}
++[chap] returns noop
++[mschap] returns noop
[eap] No EAP-Message, not doing EAP
++[eap] returns noop
[ldap] performing user authorization for whaeri
[ldap]  expand: %{Stripped-User-Name} ->
[ldap]  ... expanding second conditional
[ldap]  expand: %{User-Name} -> testuser
[ldap]  expand: (uid=%{%{Stripped-User-Name}:-%{User-Name}}) ->
(uid=testuser)
[ldap]  expand: dc=tarent,dc=de -> dc=tarent,dc=de
  [ldap] ldap_get_conn: Checking Id: 0
  [ldap] ldap_get_conn: Got Id: 0
  [ldap] attempting LDAP reconnection
  [ldap] (re)connect to 172.26.100.1:389, authentication 0
  [ldap] bind as
uid=binduser,cn=users,ou=Infrastruktur,dc=tarent,dc=de/xxxxxxxxx to
172.26.100.1:389
  [ldap] waiting for bind result ...
  [ldap] Bind was successful
  [ldap] performing search in dc=tarent,dc=de, with filter (uid=testuser)
[ldap] No default NMAS login sequence
[ldap] looking for check items in directory...
  [ldap] userPassword -> Password-With-Header ==
"{crypt}$1$l4Je/bMr$IEKzWS2SQ78eEfM/a6VB7/"
[ldap] looking for reply items in directory...
[ldap] Setting Auth-Type = LDAP
[ldap] user whaeri authorized to use remote access
  [ldap] ldap_release_conn: Release Id: 0
++[ldap] returns ok
Found Auth-Type = LDAP
# Executing group from file /etc/freeradius/sites-enabled/inner-tunnel
+- entering group LDAP {...}
[ldap] login attempt by "testuser" with password "password123"
[ldap] user DN: uid=whaeri,cn=users,dc=tarent,dc=de
  [ldap] (re)connect to 172.26.100.1:389, authentication 1
  [ldap] bind as uid=testuser,cn=users,dc=tarent,dc=de/password123 to
172.26.100.1:389
  [ldap] waiting for bind result ...
  [ldap] Bind was successful
[ldap] user testuser authenticated succesfully
++[ldap] returns ok
Login OK: [testuser] (from client localhost port 10)
# Executing section post-auth from file
/etc/freeradius/sites-enabled/inner-tunnel
+- entering group post-auth {...}
++? if (!(Ldap-Group == WLAN))
  [ldap] Entering ldap_groupcmp()
        expand: dc=tarent,dc=de -> dc=tarent,dc=de
        expand: %{Stripped-User-Name} ->
        ... expanding second conditional
        expand: %{User-Name} -> whaeri
        expand:
(&(objectClass=posixGroup)(memberUid=%{%{Stripped-User-Name}:-%{User-Name}}))
-> (&(objectClass=posixGroup)(memberUid=testuser))
  [ldap] ldap_get_conn: Checking Id: 0
  [ldap] ldap_get_conn: Got Id: 0
  [ldap] performing search in dc=tarent,dc=de, with filter
(&(cn=WLAN)(&(objectClass=posixGroup)(memberUid=testuser)))
rlm_ldap::ldap_groupcmp: User found in group WLAN
  [ldap] ldap_release_conn: Release Id: 0
?? Evaluating (Ldap-Group == WLAN) -> TRUE
? Converting !TRUE -> FALSE
++? if (!(Ldap-Group == WLAN)) -> FALSE
Sending Access-Accept of id 247 to 127.0.0.1 port 58762
Finished request 0.
Going to the next request

I am very happy to see that my request was accepted, so i configured my
Cisco Access Point so i could access the w-lan with my mobile phone or my
linux laptop.

----- Login attempt with eap tls

rad_recv: Access-Request packet from host 10.10.20.43 port 1645, id=134,
length=151
        User-Name = "farenz"
        Framed-MTU = 1400
        Called-Station-Id = "001b.8f8a.ac30"
        Calling-Station-Id = "1cb0.9475.d65a"
        Service-Type = Login-User
        Message-Authenticator = 0x5dfdd286bcfbe2d2ec991382dfdb612a
        EAP-Message = 0x02020006030d
        NAS-Port-Type = Wireless-802.11
        NAS-Port = 335
        NAS-Port-Id = "335"
        State = 0x8775567a8777525d448a92d78bfaa32e
        NAS-IP-Address = 10.10.20.43
        NAS-Identifier = "ap-bn-test"
# Executing section authorize from file
/etc/freeradius/sites-enabled/inner-tunnel
+- entering group authorize {...}
++[chap] returns noop
++[mschap] returns noop
[eap] EAP packet type response id 2 length 6
[eap] No EAP Start, assuming it's an on-going EAP conversation
++[eap] returns updated
[ldap] performing user authorization for farenz
[ldap]  expand: %{Stripped-User-Name} ->
[ldap]  ... expanding second conditional
[ldap]  expand: %{User-Name} -> farenz
[ldap]  expand: (uid=%{%{Stripped-User-Name}:-%{User-Name}}) -> (uid=farenz)
[ldap]  expand: dc=tarent,dc=de -> dc=tarent,dc=de
  [ldap] ldap_get_conn: Checking Id: 0
  [ldap] ldap_get_conn: Got Id: 0
  [ldap] performing search in dc=tarent,dc=de, with filter (uid=farenz)
[ldap] No default NMAS login sequence
[ldap] looking for check items in directory...
  [ldap] userPassword -> Password-With-Header ==
"{crypt}$1$wNTQUAjn$f0ragZNFWuArJ3FMbA2WW1"
[ldap] looking for reply items in directory...
[ldap] user farenz authorized to use remote access
  [ldap] ldap_release_conn: Release Id: 0
++[ldap] returns ok
Found Auth-Type = EAP
# Executing group from file /etc/freeradius/sites-enabled/inner-tunnel
+- entering group authenticate {...}
[eap] Request found, released from the list
[eap] EAP NAK
[eap] EAP-NAK asked for EAP-Type/tls
[eap] processing type tls
[tls] Requiring client certificate
[tls] Initiate
[tls] Start returned 1
++[eap] returns handled
Sending Access-Challenge of id 134 to 10.10.20.43 port 1645
        EAP-Message = 0x010300060d20
        Message-Authenticator = 0x00000000000000000000000000000000
        State = 0x8775567a86765b5d448a92d78bfaa32e
Finished request 4.
Going to the next request

Near the end the Radius output says:
...
[tls] Requiring client certificate
Then i've read http://deployingradius.com/documents/configuration/eap.htmlbut
i cant finde such a Validate Server Certificate option to uncheck.
Now even if i am able to create a good certificate, i had to deploy it on
about 500 Computers.

Is it possible to use freeradius without such certificates?
And if not, you might show me how to create a certificate and get this
server running?

Thank you in advance.

With best regards,
Florian

Authentification Problem with Cisco AP, freeradius and LDAP

Florian Arenz