Freeradius issues related with DMZ firewall

29 Sep 2017

      Hi Experts,

I have a 'funny' problem with my freeradius 3.0.4 and our Aruba controller.

I am testing a freeradius  with 802.1x (EAP-MSCHAPv2: WPA2-Ent+AES+PEAP)
configuration that works pretty well when both, radius & Aruba, are in our
internal network.

So works fine with Mac,Win7,Android,iphone, etc

The problem came when we moved the Machine to DMZ (Pfsense fw). Lots of
small problems (dns's, hosts,etc) raised and were solved.

I used the eapol_test successfully on an internal  linux that connects
successfully to de radius in DMZ, so I went ahead.

But when we do the same Mac,Win7,Android,etc  WiFIi connection tests with
the radius in DMZ, the authentication fails (see radius -X  log below).  

To test if it was a Firewall issues, UDP/TCP ports are fully open between
radius(DMZ) & Aruba(internal), in both ways.

We opened dmz radius to the internal DNS, 

I used a Firewall catch all rule to get any ipv4+6 that goes missing by the
Firewall rules, but nothing shows up.

I tried to Wireshark the Wifi connection from the client win7 without
success.

Well, I hope someone else had a similar problem and could share the
solution, or any clue.

Logs of the failing connection ( Win7 -> Aruba ->radius DMZ) , maybe you can
see something strange:

10.10.10.10: Aruba

84.84.84.84: Radius at DMZ

Received Access-Request Id 111 from 10.10.10.10:32866 to 84.84.84.84:1812
length 205

        User-Name = 'test@acme.com'

        NAS-IP-Address = 10.10.10.10

        NAS-Port = 0

        NAS-Identifier = '10.10.10.10'

        NAS-Port-Type = Wireless-802.11

        Calling-Station-Id = 'A4C494Exxxxx'

        Called-Station-Id = '000B866xxxxx'

        Service-Type = Login-User

        Framed-MTU = 1100

        EAP-Message = 0x0xx400xxxxxx146xxxxxxxxxxxc673

        Aruba-Essid-Name = 'TEST_SSID'

        Aruba-Location-Id = 'AP1'

        Aruba-AP-Group = 'default'

        Message-Authenticator = 0xbxxx268xxxxxxxxxxxxc10f08dae88

(0) Received Access-Request packet from host 10.10.10.10 port 32866, id=111,
length=205

(0)     User-Name = 'test@acme.com'

(0)     NAS-IP-Address = 10.10.10.10

(0)     NAS-Port = 0

(0)     NAS-Identifier = '10.10.10.10'

(0)     NAS-Port-Type = Wireless-802.11

(0)     Calling-Station-Id = 'A4C494XXXXXX'

(0)     Called-Station-Id = ''000B86xxxxxx'

(0)     Service-Type = Login-User

(0)     Framed-MTU = 1100

(0)     EAP-Message = 0x02040019017465xxxxxxxxxxxx4063656c6c732e6573

(0)     Aruba-Essid-Name = 'TEST_SSID'

(0)     Aruba-Location-Id = 'AP1'

(0)     Aruba-AP-Group = 'default'

(0)     Message-Authenticator = 0xb268fe2779551dxxxxxxxxxxxx08dae88

(0) # Executing section authorize from file /etc/raddb/sites-enabled/default

(0)   authorize {

(0)   filter_username filter_username {

(0)     if (!&User-Name)

(0)     if (!&User-Name)  -> FALSE

(0)     if (&User-Name =~ / /)

(0)     if (&User-Name =~ / /)  -> FALSE

(0)     if (&User-Name =~ /@.*@/ )

(0)     if (&User-Name =~ /@.*@/ )  -> FALSE

(0)     if (&User-Name =~ /\\.\\./ )

(0)     if (&User-Name =~ /\\.\\./ )  -> FALSE

(0)     if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\\.(.+)$/))

(0)     if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\\.(.+)$/))   ->
FALSE

(0)     if (&User-Name =~ /\\.$/)

(0)     if (&User-Name =~ /\\.$/)   -> FALSE

(0)     if (&User-Name =~ /@\\./)

(0)     if (&User-Name =~ /@\\./)   -> FALSE

(0)   } # filter_username filter_username = notfound

(0)   [preprocess] = ok

(0)  auth_log : EXPAND
/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Addres
s}}/auth-detail-%Y%m%d

(0)  auth_log :    -->
/var/log/radius/radacct/10.10.10.10/auth-detail-20170929

(0)  auth_log :
/var/log/radius/radacct/%{%{Packet-Src-IP-Address}:-%{Packet-Src-IPv6-Addres
s}}/auth-detail-%Y%m%d expands to
/var/log/radius/radacct/10.10.10.10/auth-detail-20170929

(0)  auth_log : EXPAND %t

(0)  auth_log :    --> Fri Sep 29 16:42:40 2017

(0)   [auth_log] = ok

(0)   [mschap] = noop

(0)  suffix : Checking for suffix after "@"

(0)  suffix : Looking up realm "acme.com" for User-Name = "test@acme.com"

(0)  suffix : Found realm "acme.com"

(0)  suffix : Adding Realm = "acme.com"

(0)  suffix : Authentication realm is LOCAL

(0)   [suffix] = ok

(0)  eap : Peer sent code Response (2) ID 4 length 25

(0)  eap : EAP-Identity reply, returning 'ok' so we can short-circuit the
rest of authorize

(0)   [eap] = ok

(0)  } #  authorize = ok

(0) Found Auth-Type = EAP

(0) # Executing group from file /etc/raddb/sites-enabled/default

(0)   authenticate {

(0)  eap : Peer sent method Identity (1)

(0)  eap : Calling eap_peap to process EAP data

(0)  eap_peap : Flushing SSL sessions (of #0)

(0)  eap_peap : Initiate

(0)  eap_peap : Start returned 1

(0)  eap : New EAP session, adding 'State' attribute to reply
0x7317e1da7312f877

(0)   [eap] = handled

(0)  } #  authenticate = handled

(0) Sending Access-Challenge packet to host 10.10.10.10 port 32866, id=111,
length=0

(0)     EAP-Message = 0x010500061920

(0)     Message-Authenticator = 0x00000000000000000000000000000000

(0)     State = 0x7317e1da7312f877fca7b6e2bbfa846d

Sending Access-Challenge Id 111 from 84.84.84.84:1812 to 10.10.10.10:32866

        EAP-Message = 0x010500061920

        Message-Authenticator = 0x00000000000000000000000000000000

        State = 0x7317e1da7312f877fca7b6e2bbfa846d

(0) Finished request

Waking up in 0.3 seconds.

Waking up in 6.6 seconds.

Received Access-Request Id 111 from 10.10.10.10:32866 to 84.84.84.84:1812
length 205

Sending Access-Challenge Id 111 from 84.84.84.84:1812 to 10.10.10.10:32866

Waking up in 999993.0 seconds.

Received Access-Request Id 111 from 10.10.10.10:32866 to 84.84.84.84:1812
length 205

Sending Access-Challenge Id 111 from 84.84.84.84:1812 to 10.10.10.10:32866

Waking up in 1999986.0 seconds.

Received Access-Request Id 111 from 10.10.10.10:32866 to 84.84.84.84:1812
length 205

Sending Access-Challenge Id 111 from 84.84.84.84:1812 to 10.10.10.10:32866

Waking up in 3999977.0 seconds.

Ramon Escriba

Alan Buxey

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