Proxying inner requests from EAP-TTLS

Martin Merkel martin.merkel at
Mon Jun 7 19:47:20 CEST 2010


I'm currently working on a test setup for a study thesis. The goal is to
use wired 802.1X and EAP-TTLS with a local AAA server which proxies the
tunneled requests to the appropriate home servers. My problem right now
is that I can't get freeradius to proxy the inner requests. The TTLS
tunnel is successfully established and the inner request is sent to the
virtual server. Freeradius recognizes that the inner request should be
proxied but it says that it can't create a new socket. So my question
is: Can requests in virtual servers be proxied at all or is there
another way to do it?

The version of freeradius is 2.1.9.

The configuration on the local AAA server is:

default site
authorize {
        eap {
                ok = return
authenticate {

inner tunnel
authorize {
        eap {
                ok = return
authenticate {

home_server homeaaa {
        type = auth
        ipaddr =
        port = 1812
        secret = proxy
        require_message_authenticator = no
        response_window = 20
        zombie_period = 40
        revive_interval = 120
        status_check = status-server
        check_interval = 30
        num_answers_to_alive = 3
home_server_pool aaa_pool {
        type = fail-over
        home_server = homeaaa
realm home {
        auth_pool = aaa_pool

The debug output:

rad_recv: Access-Request packet from host port 1645, id=12,
    User-Name = "anonymous at home"
    Service-Type = Framed-User
    Framed-MTU = 1504
    Called-Station-Id = "00-16-C8-3D-1B-82"
    Calling-Station-Id = "00-1B-21-15-CF-1D"
    EAP-Message =
    Message-Authenticator = 0x6a3417e727dc739f3e989254b644b56f
    NAS-Port-Type = Ethernet
    NAS-Port = 50002
    State = 0x47887413438f612a688db3fc6f33d684
    NAS-IP-Address =
+- entering group authorize {...}
++[preprocess] returns ok
[eap] EAP packet type response id 7 length 112
[eap] Continuing tunnel setup.
++[eap] returns ok
Found Auth-Type = EAP
+- entering group authenticate {...}
[eap] Request found, released from the list
[eap] EAP/ttls
[eap] processing type ttls
[ttls] Authenticate
[ttls] processing EAP-TLS
[ttls] eaptls_verify returned 7
[ttls] Done initial handshake
[ttls] eaptls_process returned 7
[ttls] Session established.  Proceeding to decode tunneled attributes.
[ttls] Got tunneled request
    EAP-Message = 0x0200000e0164656d6f40686f6d65
    FreeRADIUS-Proxied-To =
[ttls] Got tunneled identity of demo at home
[ttls] Setting default EAP type for tunneled EAP session.
[ttls] Sending tunneled request
    EAP-Message = 0x0200000e0164656d6f40686f6d65
    FreeRADIUS-Proxied-To =
    User-Name = "demo at home"
server inner-tunnel {
+- entering group authorize {...}
[suffix] Looking up realm "home" for User-Name = "demo at home"
[suffix] Found realm "home"
[suffix] Adding Realm = "home"
[suffix] Proxying request from user demo to realm home
[suffix] Preparing to proxy authentication request to realm "home"
++[suffix] returns updated
[eap] Request is supposed to be proxied to Realm home.  Not doing EAP.
++[eap] returns noop
++[files] returns noop
} # server inner-tunnel
[ttls] Got tunneled reply code 0
[ttls] Tunneled authentication will be proxied to home
[eap]   Tunneled session will be proxied.  Not doing EAP.
++[eap] returns handled
+- entering group pre-proxy {...}
[pre_proxy_log]     expand:
expands to
[pre_proxy_log]     expand: %t -> Mon Jun  7 18:22:01 2010
++[pre_proxy_log] returns ok
Failed to create a new socket for proxying requests.
ERROR: Failed inserting request into proxy hash.
ERROR: Failed to proxy request 5
There was no response configured: rejecting request 5
Using Post-Auth-Type Reject
+- entering group REJECT {...}
[attr_filter.access_reject]     expand: %{User-Name} -> anonymous at home
 attr_filter: Matched entry DEFAULT at line 11
++[attr_filter.access_reject] returns updated
Delaying reject of request 5 for 1 seconds
Going to the next request
Waking up in 0.9 seconds.
Sending delayed reject for request 5
Sending Access-Reject of id 12 to port 1645
Waking up in 3.8 seconds.
Cleaning up request 0 ID 7 with timestamp +32
Cleaning up request 1 ID 8 with timestamp +32
Cleaning up request 2 ID 9 with timestamp +32
Cleaning up request 3 ID 10 with timestamp +32
Cleaning up request 4 ID 11 with timestamp +32
Waking up in 1.0 seconds.
Cleaning up request 5 ID 12 with timestamp +32
rlm_eap_ttls: Freeing handler for user demo at home
Ready to process requests.

If I read the code correctly, the problem should originate in listen.c
in function

  rad_listen_t *proxy_new_listener(fr_ipaddr_t *ipaddr, int exists)

I hope that I included all the neccessary information.

Kind regards,

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