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fragattacks/tests/hwsim/test_erp.py
Jouni Malinen 8e416cecdb tests: Make key-lifetime-in-memory more robust for GTK check 
The decrypted copy of a GTK from EAPOL-Key is cleared from memory only
after having sent out CTRL-EVENT-CONNECTED. As such, there was a race
condition on the test case reading the wpa_supplicant process memory
after the connection. This was unlikely to occur due to the one second
sleep, but even with that, it would be at least theorically possible to
hit this race under heavy load (e.g., when using large number of VMs to
run parallel testing). Avoid this by running a PING command to make sure
wpa_supplicant has returned to eloop before reading the process memory.
This should make it less likely to report false positives on GTK being
found in memory.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
2015-12-14 17:23:47 +02:00

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# EAP Re-authentication Protocol (ERP) tests
# Copyright (c) 2014-2015, Jouni Malinen <j@w1.fi>
#
# This software may be distributed under the terms of the BSD license.
# See README for more details.
import binascii
import logging
logger = logging.getLogger()
import os
import time
import hostapd
from utils import HwsimSkip
from test_ap_eap import int_eap_server_params
from test_ap_psk import find_wpas_process, read_process_memory, verify_not_present, get_key_locations
def check_erp_capa(dev):
capab = dev.get_capability("erp")
if not capab or 'ERP' not in capab:
raise HwsimSkip("ERP not supported in the build")
def test_erp_initiate_reauth_start(dev, apdev):
"""Authenticator sending EAP-Initiate/Re-auth-Start, but ERP disabled on peer"""
params = hostapd.wpa2_eap_params(ssid="test-wpa2-eap")
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("ERP_FLUSH")
dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP",
eap="PAX", identity="pax.user@example.com",
password_hex="0123456789abcdef0123456789abcdef",
scan_freq="2412")
def test_erp_enabled_on_server(dev, apdev):
"""ERP enabled on internal EAP server, but disabled on peer"""
params = int_eap_server_params()
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
params['eap_server_erp'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("ERP_FLUSH")
dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP",
eap="PAX", identity="pax.user@example.com",
password_hex="0123456789abcdef0123456789abcdef",
scan_freq="2412")
def test_erp(dev, apdev):
"""ERP enabled on server and peer"""
check_erp_capa(dev[0])
params = int_eap_server_params()
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
params['eap_server_erp'] = '1'
params['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("ERP_FLUSH")
dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP",
eap="PSK", identity="psk.user@example.com",
password_hex="0123456789abcdef0123456789abcdef",
erp="1", scan_freq="2412")
for i in range(3):
dev[0].request("DISCONNECT")
dev[0].wait_disconnected(timeout=15)
dev[0].request("RECONNECT")
ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15)
if ev is None:
raise Exception("EAP success timed out")
if "EAP re-authentication completed successfully" not in ev:
raise Exception("Did not use ERP")
dev[0].wait_connected(timeout=15, error="Reconnection timed out")
def test_erp_server_no_match(dev, apdev):
"""ERP enabled on server and peer, but server has no key match"""
check_erp_capa(dev[0])
params = int_eap_server_params()
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
params['eap_server_erp'] = '1'
params['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("ERP_FLUSH")
id = dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP",
eap="PSK", identity="psk.user@example.com",
password_hex="0123456789abcdef0123456789abcdef",
erp="1", scan_freq="2412")
dev[0].request("DISCONNECT")
dev[0].wait_disconnected(timeout=15)
hapd.request("ERP_FLUSH")
dev[0].request("RECONNECT")
ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS",
"CTRL-EVENT-EAP-FAILURE"], timeout=15)
if ev is None:
raise Exception("EAP result timed out")
if "CTRL-EVENT-EAP-SUCCESS" in ev:
raise Exception("Unexpected EAP success")
dev[0].request("DISCONNECT")
dev[0].select_network(id)
ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15)
if ev is None:
raise Exception("EAP success timed out")
if "EAP re-authentication completed successfully" in ev:
raise Exception("Unexpected use of ERP")
dev[0].wait_connected(timeout=15, error="Reconnection timed out")
def start_erp_as(apdev):
params = { "ssid": "as", "beacon_int": "2000",
"radius_server_clients": "auth_serv/radius_clients.conf",
"radius_server_auth_port": '18128',
"eap_server": "1",
"eap_user_file": "auth_serv/eap_user.conf",
"ca_cert": "auth_serv/ca.pem",
"server_cert": "auth_serv/server.pem",
"private_key": "auth_serv/server.key",
"eap_sim_db": "unix:/tmp/hlr_auc_gw.sock",
"dh_file": "auth_serv/dh.conf",
"pac_opaque_encr_key": "000102030405060708090a0b0c0d0e0f",
"eap_fast_a_id": "101112131415161718191a1b1c1d1e1f",
"eap_fast_a_id_info": "test server",
"eap_server_erp": "1",
"erp_domain": "example.com" }
hostapd.add_ap(apdev['ifname'], params)
def test_erp_radius(dev, apdev):
"""ERP enabled on RADIUS server and peer"""
check_erp_capa(dev[0])
start_erp_as(apdev[1])
params = hostapd.wpa2_eap_params(ssid="test-wpa2-eap")
params['auth_server_port'] = "18128"
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
params['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("ERP_FLUSH")
dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP",
eap="PSK", identity="psk.user@example.com",
password_hex="0123456789abcdef0123456789abcdef",
erp="1", scan_freq="2412")
for i in range(3):
dev[0].request("DISCONNECT")
dev[0].wait_disconnected(timeout=15)
dev[0].request("RECONNECT")
ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15)
if ev is None:
raise Exception("EAP success timed out")
if "EAP re-authentication completed successfully" not in ev:
raise Exception("Did not use ERP")
dev[0].wait_connected(timeout=15, error="Reconnection timed out")
def erp_test(dev, hapd, **kwargs):
res = dev.get_capability("eap")
if kwargs['eap'] not in res:
logger.info("Skip ERP test with %s due to missing support" % kwargs['eap'])
return
hapd.dump_monitor()
dev.dump_monitor()
dev.request("ERP_FLUSH")
id = dev.connect("test-wpa2-eap", key_mgmt="WPA-EAP", erp="1",
scan_freq="2412", **kwargs)
dev.request("DISCONNECT")
dev.wait_disconnected(timeout=15)
hapd.dump_monitor()
dev.request("RECONNECT")
ev = dev.wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15)
if ev is None:
raise Exception("EAP success timed out")
if "EAP re-authentication completed successfully" not in ev:
raise Exception("Did not use ERP")
dev.wait_connected(timeout=15, error="Reconnection timed out")
ev = hapd.wait_event([ "AP-STA-CONNECTED" ], timeout=5)
if ev is None:
raise Exception("No connection event received from hostapd")
dev.request("DISCONNECT")
def test_erp_radius_eap_methods(dev, apdev):
"""ERP enabled on RADIUS server and peer"""
check_erp_capa(dev[0])
eap_methods = dev[0].get_capability("eap")
start_erp_as(apdev[1])
params = hostapd.wpa2_eap_params(ssid="test-wpa2-eap")
params['auth_server_port'] = "18128"
params['erp_send_reauth_start'] = '1'
params['erp_domain'] = 'example.com'
params['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
erp_test(dev[0], hapd, eap="AKA", identity="0232010000000000@example.com",
password="90dca4eda45b53cf0f12d7c9c3bc6a89:cb9cccc4b9258e6dca4760379fb82581:000000000123")
erp_test(dev[0], hapd, eap="AKA'", identity="6555444333222111@example.com",
password="5122250214c33e723a5dd523fc145fc0:981d464c7c52eb6e5036234984ad0bcf:000000000123")
erp_test(dev[0], hapd, eap="EKE", identity="erp-eke@example.com",
password="hello")
if "FAST" in eap_methods:
erp_test(dev[0], hapd, eap="FAST", identity="erp-fast@example.com",
password="password", ca_cert="auth_serv/ca.pem",
phase2="auth=GTC",
phase1="fast_provisioning=2",
pac_file="blob://fast_pac_auth_erp")
erp_test(dev[0], hapd, eap="GPSK", identity="erp-gpsk@example.com",
password="abcdefghijklmnop0123456789abcdef")
erp_test(dev[0], hapd, eap="IKEV2", identity="erp-ikev2@example.com",
password="password")
erp_test(dev[0], hapd, eap="PAX", identity="erp-pax@example.com",
password_hex="0123456789abcdef0123456789abcdef")
# TODO: PEAP (EMSK)
#if "MSCHAPV2" in eap_methods:
# erp_test(dev[0], hapd, eap="PEAP", identity="erp-peap@example.com",
# password="password", ca_cert="auth_serv/ca.pem",
# phase2="auth=MSCHAPV2")
erp_test(dev[0], hapd, eap="PSK", identity="erp-psk@example.com",
password_hex="0123456789abcdef0123456789abcdef")
if "PWD" in eap_methods:
erp_test(dev[0], hapd, eap="PWD", identity="erp-pwd@example.com",
password="secret password")
erp_test(dev[0], hapd, eap="SAKE", identity="erp-sake@example.com",
password_hex="0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef")
erp_test(dev[0], hapd, eap="SIM", identity="1232010000000000@example.com",
password="90dca4eda45b53cf0f12d7c9c3bc6a89:cb9cccc4b9258e6dca4760379fb82581")
erp_test(dev[0], hapd, eap="TLS", identity="erp-tls@example.com",
ca_cert="auth_serv/ca.pem", client_cert="auth_serv/user.pem",
private_key="auth_serv/user.key")
erp_test(dev[0], hapd, eap="TTLS", identity="erp-ttls@example.com",
password="password", ca_cert="auth_serv/ca.pem", phase2="auth=PAP")
def test_erp_key_lifetime_in_memory(dev, apdev, params):
"""ERP and key lifetime in memory"""
check_erp_capa(dev[0])
p = int_eap_server_params()
p['erp_send_reauth_start'] = '1'
p['erp_domain'] = 'example.com'
p['eap_server_erp'] = '1'
p['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], p)
password = "63d2d21ac3c09ed567ee004a34490f1d16e7fa5835edf17ddba70a63f1a90a25"
pid = find_wpas_process(dev[0])
dev[0].request("ERP_FLUSH")
dev[0].connect("test-wpa2-eap", key_mgmt="WPA-EAP", eap="TTLS",
identity="pap-secret@example.com", password=password,
ca_cert="auth_serv/ca.pem", phase2="auth=PAP",
erp="1", scan_freq="2412")
# The decrypted copy of GTK is freed only after the CTRL-EVENT-CONNECTED
# event has been delivered, so verify that wpa_supplicant has returned to
# eloop before reading process memory.
time.sleep(1)
dev[0].ping()
buf = read_process_memory(pid, password)
dev[0].request("DISCONNECT")
dev[0].wait_disconnected(timeout=15)
dev[0].relog()
msk = None
emsk = None
rRK = None
rIK = None
pmk = None
ptk = None
gtk = None
with open(os.path.join(params['logdir'], 'log0'), 'r') as f:
for l in f.readlines():
if "EAP-TTLS: Derived key - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
msk = binascii.unhexlify(val)
if "EAP-TTLS: Derived EMSK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
emsk = binascii.unhexlify(val)
if "EAP: ERP rRK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
rRK = binascii.unhexlify(val)
if "EAP: ERP rIK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
rIK = binascii.unhexlify(val)
if "WPA: PMK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
pmk = binascii.unhexlify(val)
if "WPA: PTK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
ptk = binascii.unhexlify(val)
if "WPA: Group Key - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
gtk = binascii.unhexlify(val)
if not msk or not emsk or not rIK or not rRK or not pmk or not ptk or not gtk:
raise Exception("Could not find keys from debug log")
if len(gtk) != 16:
raise Exception("Unexpected GTK length")
kck = ptk[0:16]
kek = ptk[16:32]
tk = ptk[32:48]
fname = os.path.join(params['logdir'],
'erp_key_lifetime_in_memory.memctx-')
logger.info("Checking keys in memory while associated")
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
get_key_locations(buf, msk, "MSK")
get_key_locations(buf, emsk, "EMSK")
get_key_locations(buf, rRK, "rRK")
get_key_locations(buf, rIK, "rIK")
if password not in buf:
raise HwsimSkip("Password not found while associated")
if pmk not in buf:
raise HwsimSkip("PMK not found while associated")
if kck not in buf:
raise Exception("KCK not found while associated")
if kek not in buf:
raise Exception("KEK not found while associated")
if tk in buf:
raise Exception("TK found from memory")
if gtk in buf:
get_key_locations(buf, gtk, "GTK")
raise Exception("GTK found from memory")
logger.info("Checking keys in memory after disassociation")
buf = read_process_memory(pid, password)
# Note: Password is still present in network configuration
# Note: PMK is in EAP fast re-auth data
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
get_key_locations(buf, msk, "MSK")
get_key_locations(buf, emsk, "EMSK")
get_key_locations(buf, rRK, "rRK")
get_key_locations(buf, rIK, "rIK")
verify_not_present(buf, kck, fname, "KCK")
verify_not_present(buf, kek, fname, "KEK")
verify_not_present(buf, tk, fname, "TK")
verify_not_present(buf, gtk, fname, "GTK")
dev[0].request("RECONNECT")
ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=15)
if ev is None:
raise Exception("EAP success timed out")
if "EAP re-authentication completed successfully" not in ev:
raise Exception("Did not use ERP")
dev[0].wait_connected(timeout=15, error="Reconnection timed out")
dev[0].request("DISCONNECT")
dev[0].wait_disconnected(timeout=15)
dev[0].relog()
pmk = None
ptk = None
gtk = None
with open(os.path.join(params['logdir'], 'log0'), 'r') as f:
for l in f.readlines():
if "WPA: PMK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
pmk = binascii.unhexlify(val)
if "WPA: PTK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
ptk = binascii.unhexlify(val)
if "WPA: GTK in EAPOL-Key - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
gtk = binascii.unhexlify(val)
if not pmk or not ptk or not gtk:
raise Exception("Could not find keys from debug log")
kck = ptk[0:16]
kek = ptk[16:32]
tk = ptk[32:48]
logger.info("Checking keys in memory after ERP and disassociation")
buf = read_process_memory(pid, password)
# Note: Password is still present in network configuration
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
get_key_locations(buf, msk, "MSK")
get_key_locations(buf, emsk, "EMSK")
get_key_locations(buf, rRK, "rRK")
get_key_locations(buf, rIK, "rIK")
verify_not_present(buf, kck, fname, "KCK")
verify_not_present(buf, kek, fname, "KEK")
verify_not_present(buf, tk, fname, "TK")
verify_not_present(buf, gtk, fname, "GTK")
dev[0].request("REMOVE_NETWORK all")
logger.info("Checking keys in memory after network profile removal")
buf = read_process_memory(pid, password)
# Note: rRK and rIK are still in memory
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
get_key_locations(buf, msk, "MSK")
get_key_locations(buf, emsk, "EMSK")
get_key_locations(buf, rRK, "rRK")
get_key_locations(buf, rIK, "rIK")
verify_not_present(buf, password, fname, "password")
verify_not_present(buf, pmk, fname, "PMK")
verify_not_present(buf, kck, fname, "KCK")
verify_not_present(buf, kek, fname, "KEK")
verify_not_present(buf, tk, fname, "TK")
verify_not_present(buf, gtk, fname, "GTK")
verify_not_present(buf, msk, fname, "MSK")
verify_not_present(buf, emsk, fname, "EMSK")
dev[0].request("ERP_FLUSH")
logger.info("Checking keys in memory after ERP_FLUSH")
buf = read_process_memory(pid, password)
get_key_locations(buf, rRK, "rRK")
get_key_locations(buf, rIK, "rIK")
verify_not_present(buf, rRK, fname, "rRK")
verify_not_present(buf, rIK, fname, "rIK")
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