jeltz/hostap
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity
hostap/tests/hwsim/test_sae.py
Jouni Malinen 5b3c40a65b tests: Verify that wpa_supplicant clears keys from memory 
Check that PMK and PTK and not left in memory (heap or stack)
unnecessarily after they are not needed anymore.

Signed-off-by: Jouni Malinen <j@w1.fi>
2014-12-30 10:37:02 +02:00

286 lines
11 KiB
Python
Raw Blame History

# Test cases for SAE
# Copyright (c) 2013-2014, 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 os
import time
import subprocess
import logging
logger = logging.getLogger()
import hwsim_utils
import hostapd
from test_ap_psk import find_wpas_process, read_process_memory, verify_not_present, get_key_locations
def test_sae(dev, apdev):
"""SAE with default group"""
params = hostapd.wpa2_params(ssid="test-sae",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
key_mgmt = hapd.get_config()['key_mgmt']
if key_mgmt.split(' ')[0] != "SAE":
raise Exception("Unexpected GET_CONFIG(key_mgmt): " + key_mgmt)
dev[0].request("SET sae_groups ")
id = dev[0].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
if dev[0].get_status_field('sae_group') != '19':
raise Exception("Expected default SAE group not used")
bss = dev[0].get_bss(apdev[0]['bssid'])
if 'flags' not in bss:
raise Exception("Could not get BSS flags from BSS table")
if "[WPA2-SAE-CCMP]" not in bss['flags']:
raise Exception("Unexpected BSS flags: " + bss['flags'])
def test_sae_pmksa_caching(dev, apdev):
"""SAE and PMKSA caching"""
params = hostapd.wpa2_params(ssid="test-sae",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("SET sae_groups ")
dev[0].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
dev[0].request("DISCONNECT")
dev[0].request("RECONNECT")
dev[0].wait_connected(timeout=15, error="Reconnect timed out")
if dev[0].get_status_field('sae_group') is not None:
raise Exception("SAE group claimed to have been used")
def test_sae_pmksa_caching_disabled(dev, apdev):
"""SAE and PMKSA caching disabled"""
params = hostapd.wpa2_params(ssid="test-sae",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
params['disable_pmksa_caching'] = '1'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("SET sae_groups ")
dev[0].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
dev[0].request("DISCONNECT")
dev[0].request("RECONNECT")
dev[0].wait_connected(timeout=15, error="Reconnect timed out")
if dev[0].get_status_field('sae_group') != '19':
raise Exception("Expected default SAE group not used")
def test_sae_groups(dev, apdev):
"""SAE with all supported groups"""
# This would be the full list of supported groups, but groups 14-16
# (2048-4096 bit MODP) are a bit too slow on some VMs and can result in
# hitting mac80211 authentication timeout, so skip them for now.
#sae_groups = [ 19, 25, 26, 20, 21, 2, 5, 14, 15, 16, 22, 23, 24 ]
sae_groups = [ 19, 25, 26, 20, 21, 2, 5, 22, 23, 24 ]
groups = [str(g) for g in sae_groups]
params = hostapd.wpa2_params(ssid="test-sae-groups",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
params['sae_groups'] = ' '.join(groups)
hostapd.add_ap(apdev[0]['ifname'], params)
for g in groups:
logger.info("Testing SAE group " + g)
dev[0].request("SET sae_groups " + g)
id = dev[0].connect("test-sae-groups", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
if dev[0].get_status_field('sae_group') != g:
raise Exception("Expected SAE group not used")
dev[0].remove_network(id)
def test_sae_group_nego(dev, apdev):
"""SAE group negotiation"""
params = hostapd.wpa2_params(ssid="test-sae-group-nego",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
params['sae_groups'] = '19'
hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("SET sae_groups 25 26 20 19")
dev[0].connect("test-sae-group-nego", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
if dev[0].get_status_field('sae_group') != '19':
raise Exception("Expected SAE group not used")
def test_sae_anti_clogging(dev, apdev):
"""SAE anti clogging"""
params = hostapd.wpa2_params(ssid="test-sae", passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
params['sae_anti_clogging_threshold'] = '1'
hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("SET sae_groups ")
dev[1].request("SET sae_groups ")
id = {}
for i in range(0, 2):
dev[i].scan(freq="2412")
id[i] = dev[i].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412", only_add_network=True)
for i in range(0, 2):
dev[i].select_network(id[i])
for i in range(0, 2):
dev[i].wait_connected(timeout=10)
def test_sae_forced_anti_clogging(dev, apdev):
"""SAE anti clogging (forced)"""
params = hostapd.wpa2_params(ssid="test-sae", passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE WPA-PSK'
params['sae_anti_clogging_threshold'] = '0'
hostapd.add_ap(apdev[0]['ifname'], params)
dev[2].connect("test-sae", psk="12345678", scan_freq="2412")
for i in range(0, 2):
dev[i].request("SET sae_groups ")
dev[i].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
def test_sae_mixed(dev, apdev):
"""Mixed SAE and non-SAE network"""
params = hostapd.wpa2_params(ssid="test-sae", passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE WPA-PSK'
params['sae_anti_clogging_threshold'] = '0'
hostapd.add_ap(apdev[0]['ifname'], params)
dev[2].connect("test-sae", psk="12345678", scan_freq="2412")
for i in range(0, 2):
dev[i].request("SET sae_groups ")
dev[i].connect("test-sae", psk="12345678", key_mgmt="SAE",
scan_freq="2412")
def test_sae_missing_password(dev, apdev):
"""SAE and missing password"""
params = hostapd.wpa2_params(ssid="test-sae",
passphrase="12345678")
params['wpa_key_mgmt'] = 'SAE'
hapd = hostapd.add_ap(apdev[0]['ifname'], params)
dev[0].request("SET sae_groups ")
id = dev[0].connect("test-sae",
raw_psk="46b4a73b8a951ad53ebd2e0afdb9c5483257edd4c21d12b7710759da70945858",
key_mgmt="SAE", scan_freq="2412", wait_connect=False)
ev = dev[0].wait_event(['CTRL-EVENT-SSID-TEMP-DISABLED'], timeout=10)
if ev is None:
raise Exception("Invalid network not temporarily disabled")
def test_sae_key_lifetime_in_memory(dev, apdev, params):
"""SAE and key lifetime in memory"""
password = "5ad144a7c1f5a5503baa6fa01dabc15b1843e8c01662d78d16b70b5cd23cf8b"
p = hostapd.wpa2_params(ssid="test-sae", passphrase=password)
p['wpa_key_mgmt'] = 'SAE'
hapd = hostapd.add_ap(apdev[0]['ifname'], p)
pid = find_wpas_process(dev[0])
dev[0].request("SET sae_groups ")
id = dev[0].connect("test-sae", psk=password, key_mgmt="SAE",
scan_freq="2412")
time.sleep(0.1)
buf = read_process_memory(pid, password)
dev[0].request("DISCONNECT")
dev[0].wait_disconnected()
dev[0].relog()
sae_k = None
sae_keyseed = None
sae_kck = None
pmk = None
ptk = None
gtk = None
with open(os.path.join(params['logdir'], 'log0'), 'r') as f:
for l in f.readlines():
if "SAE: k - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
sae_k = binascii.unhexlify(val)
if "SAE: keyseed - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
sae_keyseed = binascii.unhexlify(val)
if "SAE: KCK - hexdump" in l:
val = l.strip().split(':')[3].replace(' ', '')
sae_kck = binascii.unhexlify(val)
if "SAE: 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 sae_k or not sae_keyseed or not sae_kck 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'],
'sae_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")
if password not in buf:
print("Password not found while associated")
return "skip"
if pmk not in buf:
print("PMK not found while associated")
return "skip"
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:
raise Exception("GTK found from memory")
verify_not_present(buf, sae_k, fname, "SAE(k)")
verify_not_present(buf, sae_keyseed, fname, "SAE(keyseed)")
verify_not_present(buf, sae_kck, fname, "SAE(KCK)")
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 PMKSA cache
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "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, sae_k, fname, "SAE(k)")
verify_not_present(buf, sae_keyseed, fname, "SAE(keyseed)")
verify_not_present(buf, sae_kck, fname, "SAE(KCK)")
dev[0].request("PMKSA_FLUSH")
logger.info("Checking keys in memory after PMKSA cache flush")
buf = read_process_memory(pid, password)
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
verify_not_present(buf, pmk, fname, "PMK")
dev[0].request("REMOVE_NETWORK all")
logger.info("Checking keys in memory after network profile removal")
buf = read_process_memory(pid, password)
get_key_locations(buf, password, "Password")
get_key_locations(buf, pmk, "PMK")
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, sae_k, fname, "SAE(k)")
verify_not_present(buf, sae_keyseed, fname, "SAE(keyseed)")
verify_not_present(buf, sae_kck, fname, "SAE(KCK)")
Reference in a new issue View git blame Copy permalink