configuring FT-EAP with hostapd

Wed Mar 15 08:14:25 PDT 2017

Hi,

I am trying to configure Fast Transition between 2 AccessPoints.
I was able to get working config for FT-PSK with local key generation
(ft_psk_generate_local=1)

However, for FT-EAP its not an option. So I set following configuration:

AP-1

#MAC Addresses used
#wlan0        ether 30:b5:c2:15:73:1c  txqueuelen 1000  (Ethernet)
#wlan1        ether 30:b5:c2:15:da:b2  txqueuelen 1000  (Ethernet)
#wlan2        ether 30:b5:c2:18:b3:34  txqueuelen 1000  (Ethernet)
#-----------------------------------------------------------------------------
interface=wlan0
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
ctrl_interface=/var/run/hostapd

eapol_key_index_workaround=0
eap_server=1
eap_user_file=/opt/eap/peap-alpha/hostapd.eap_user
ca_cert=/opt/eap/peap-alpha/CA.crt
server_cert=/opt/eap/peap-alpha/CA.crt
private_key=/opt/eap/peap-alpha/CA.key
ieee8021x=1
wpa=2
#changes for 802.11r:
#only FT-clients:
wpa_key_mgmt=FT-EAP
#push R1 key to other APs:
pmk_r1_push=1

#list of keyholders, AES-128 keys: openet1, openet2:
r0kh=30:b5:c2:15:da:b2 ap2.example.com 1FC4BBA69DB8EB396A24249B406BA2A5
r0kh=30:b5:c2:15:73:1c ap1.example.com 1FC4BBA69DB8EB396A24249B406BA2A5
r1kh=30:b5:c2:15:73:1c 30:b5:c2:15:da:b2 1FC4BBA69DB8EB396A24249B406BA2A5
r1kh=30:b5:c2:15:da:b2 30:b5:c2:15:73:1c 1FC4BBA69DB8EB396A24249B406BA2A5
#NAS ID:
nas_identifier=ap1.example.com
#mobility domain:
mobility_domain=a1b2
#interface to send/receive packets
r0_key_lifetime=10000
ft_over_ds=0
r1_key_holder=30b5c215731c
ft_psk_generate_local=1

#reassociation deadline in time units (TUs / 1.024 ms; range 1000..65535)
reassociation_deadline=1000
wpa_pairwise=CCMP
wpa_group_rekey=3600
rsn_pairwise=CCMP
rsn_preauth=0
ctrl_interface_group=0
macaddr_acl=0

ssid=802.11R_AP
country_code=IE
ieee80211n=1
ieee80211d=1
hw_mode=g
channel=7

AP-2

#MAC Addresses used
#wlan0        ether 30:b5:c2:15:73:1c  txqueuelen 1000  (Ethernet)
#wlan1        ether 30:b5:c2:15:da:b2  txqueuelen 1000  (Ethernet)
#wlan2        ether 30:b5:c2:18:b3:34  txqueuelen 1000  (Ethernet)
#-----------------------------------------------------------------------------
interface=wlan0
logger_syslog=-1
logger_syslog_level=2
logger_stdout=-1
logger_stdout_level=2
ctrl_interface=/var/run/hostapd

eapol_key_index_workaround=0
eap_server=1
eap_user_file=/opt/eap/peap-alpha/hostapd.eap_user
ca_cert=/opt/eap/peap-alpha/CA.crt
server_cert=/opt/eap/peap-alpha/CA.crt
private_key=/opt/peap-alpha/CA.key
ieee8021x=1
wpa=2
#changes for 802.11r:
#only FT-clients:
wpa_key_mgmt=FT-EAP
#push R1 key to other APs:
pmk_r1_push=1

#list of keyholders, AES-128 keys: openet1, openet2:
r0kh=30:b5:c2:15:da:b2 ap2.example.com 1FC4BBA69DB8EB396A24249B406BA2A5
r0kh=30:b5:c2:15:73:1c ap1.example.com 1FC4BBA69DB8EB396A24249B406BA2A5
r1kh=30:b5:c2:15:73:1c 30:b5:c2:15:da:b2 1FC4BBA69DB8EB396A24249B406BA2A5
r1kh=30:b5:c2:15:da:b2 30:b5:c2:15:73:1c 1FC4BBA69DB8EB396A24249B406BA2A5

#NAS ID:
nas_identifier=ap2.example.com
#mobility domain:
mobility_domain=a1b2
#interface to send/receive packets
r0_key_lifetime=10000
ft_over_ds=0
r1_key_holder=30b5c215dab2
ft_psk_generate_local=1

#reassociation deadline in time units (TUs / 1.024 ms; range 1000..65535)
reassociation_deadline=1000
wpa_pairwise=CCMP
wpa_group_rekey=3600
rsn_pairwise=CCMP
rsn_preauth=0
ctrl_interface_group=0
macaddr_acl=0

ssid=802.11R_AP
country_code=IE
ieee80211n=1
ieee80211d=1
hw_mode=g
channel=7

Unfortunately when trying to execute fast transition, I have following
issue (AP2 hostapd log):

FT: STA R0KH-ID - hexdump(len=15): 61 70 31 2e 65 78 61 6d 70 6c 65 2e 63 6f 6d
FT: Requested PMKR0Name - hexdump(len=16): 47 ad 87 45 3b ed d3 6d 36
0b 12 6c 40 78 10 e3
FT: Derived requested PMKR1Name - hexdump(len=16): 8f ee a9 44 89 6f
ec 3e 8b 60 5f 9d fc 6e b7 8b
FT: Send PMK-R1 pull request to remote R0KH address 30:b5:c2:15:73:1c
FT: RRB send to 30:b5:c2:15:73:1c
FT: Callback postponed until response is available res=-1
FT: Received authentication frame: STA=60:a3:7d:8c:6d:38
BSSID=30:b5:c2:18:a6:56 transaction=1
FT: Received authentication frame IEs - hexdump(len=167): 30 26 01 00
00 0f ac 04 01 00 00 0f ac 04 01 00 00 0f ac 03 0c 00 01 00 47 ad 87
45 3b ed d3 6d 36 0b 12 6c 40 78 10 e3 36 03 a1 b2 00 37 63 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 19 9b 8c db 66 d8 9b 63 24 e6 d8 cd 9c c9 e6 4b cd a5 36 95 4b 50
2d 43 6a 1d 50 e8 bc 5e e2 f4 03 0f 61 70 31 2e 65 78 61 6d 70 6c 65
2e 63 6f 6d 7f 08 04 00 00 00 00 00 00 40 dd 09 00 10 18 02 01 00 10
00 00

So I see there is a pull request send to AP-1. This request shall be
made over air, as ft_over_ds=0. Unfortunately I cant even see such a
request in wireshark... and there is no reply either...
The phone connects to AP-2 with full authentication, so FT failed.

Any advice? Does exchange of keys works over air or I need to setup it over DS?
If setting it up over DS, do I need to have some special vlan
configuration? Both APs are connected by Ethernet and a single switch.

Best Regards
Wojciech Zyszczynski