tests: Verify PMKSA caching

Signed-hostap: Jouni Malinen <j@w1.fi>

tests/hwsim/test_pmksa_cache.py

@@ -0,0 +1,186 @@
+#!/usr/bin/python
+#
+# WPA2-Enterprise PMKSA caching tests
+# Copyright (c) 2013, Jouni Malinen <j@w1.fi>
+#
+# This software may be distributed under the terms of the BSD license.
+# See README for more details.
+
+import logging
+logger = logging.getLogger()
+
+import hostapd
+
+def test_pmksa_cache_on_roam_back(dev, apdev):
+    """PMKSA cache to skip EAP on reassociation back to same AP"""
+    params = hostapd.wpa2_eap_params(ssid="test-pmksa-cache")
+    hostapd.add_ap(apdev[0]['ifname'], params)
+    bssid = apdev[0]['bssid']
+    dev[0].connect("test-pmksa-cache", proto="RSN", key_mgmt="WPA-EAP",
+                   eap="GPSK", identity="gpsk user",
+                   password="abcdefghijklmnop0123456789abcdef",
+                   scan_freq="2412")
+    pmksa = dev[0].get_pmksa(bssid)
+    if pmksa is None:
+        raise Exception("No PMKSA cache entry created")
+    if pmksa['opportunistic'] != '0':
+        raise Exception("Unexpected opportunistic PMKSA cache entry")
+
+    hostapd.add_ap(apdev[1]['ifname'], params)
+    bssid2 = apdev[1]['bssid']
+
+    dev[0].dump_monitor()
+    logger.info("Roam to AP2")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid2)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=10)
+    if ev is None:
+        raise Exception("EAP success timed out")
+    ev = dev[0].wait_event(["CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    pmksa2 = dev[0].get_pmksa(bssid2)
+    if pmksa2 is None:
+        raise Exception("No PMKSA cache entry found")
+    if pmksa2['opportunistic'] != '0':
+        raise Exception("Unexpected opportunistic PMKSA cache entry")
+
+    dev[0].dump_monitor()
+    logger.info("Roam back to AP1")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-STARTED",
+                            "CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    if "CTRL-EVENT-EAP-STARTED" in ev:
+        raise Exception("Unexpected EAP exchange")
+    pmksa1b = dev[0].get_pmksa(bssid)
+    if pmksa1b is None:
+        raise Exception("No PMKSA cache entry found")
+    if pmksa['pmkid'] != pmksa1b['pmkid']:
+        raise Exception("Unexpected PMKID change for AP1")
+
+def test_pmksa_cache_opportunistic_only_on_sta(dev, apdev):
+    """Opportunistic PMKSA caching enabled only on station"""
+    params = hostapd.wpa2_eap_params(ssid="test-pmksa-cache")
+    hostapd.add_ap(apdev[0]['ifname'], params)
+    bssid = apdev[0]['bssid']
+    dev[0].connect("test-pmksa-cache", proto="RSN", key_mgmt="WPA-EAP",
+                   eap="GPSK", identity="gpsk user",
+                   password="abcdefghijklmnop0123456789abcdef", okc=True,
+                   scan_freq="2412")
+    pmksa = dev[0].get_pmksa(bssid)
+    if pmksa is None:
+        raise Exception("No PMKSA cache entry created")
+    if pmksa['opportunistic'] != '0':
+        raise Exception("Unexpected opportunistic PMKSA cache entry")
+
+    hostapd.add_ap(apdev[1]['ifname'], params)
+    bssid2 = apdev[1]['bssid']
+
+    dev[0].dump_monitor()
+    logger.info("Roam to AP2")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid2)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-SUCCESS"], timeout=10)
+    if ev is None:
+        raise Exception("EAP success timed out")
+    ev = dev[0].wait_event(["CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    pmksa2 = dev[0].get_pmksa(bssid2)
+    if pmksa2 is None:
+        raise Exception("No PMKSA cache entry found")
+    if pmksa2['opportunistic'] != '0':
+        raise Exception("Unexpected opportunistic PMKSA cache entry")
+
+    dev[0].dump_monitor()
+    logger.info("Roam back to AP1")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-STARTED",
+                            "CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    if "CTRL-EVENT-EAP-STARTED" in ev:
+        raise Exception("Unexpected EAP exchange")
+    pmksa1b = dev[0].get_pmksa(bssid)
+    if pmksa1b is None:
+        raise Exception("No PMKSA cache entry found")
+    if pmksa['pmkid'] != pmksa1b['pmkid']:
+        raise Exception("Unexpected PMKID change for AP1")
+
+def test_pmksa_cache_opportunistic(dev, apdev):
+    """Opportunistic PMKSA caching"""
+    params = hostapd.wpa2_eap_params(ssid="test-pmksa-cache")
+    params['okc'] = "1"
+    hostapd.add_ap(apdev[0]['ifname'], params)
+    bssid = apdev[0]['bssid']
+    dev[0].connect("test-pmksa-cache", proto="RSN", key_mgmt="WPA-EAP",
+                   eap="GPSK", identity="gpsk user",
+                   password="abcdefghijklmnop0123456789abcdef", okc=True,
+                   scan_freq="2412")
+    pmksa = dev[0].get_pmksa(bssid)
+    if pmksa is None:
+        raise Exception("No PMKSA cache entry created")
+    if pmksa['opportunistic'] != '0':
+        raise Exception("Unexpected opportunistic PMKSA cache entry")
+
+    hostapd.add_ap(apdev[1]['ifname'], params)
+    bssid2 = apdev[1]['bssid']
+
+    dev[0].dump_monitor()
+    logger.info("Roam to AP2")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid2)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-STARTED",
+                            "CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    if "CTRL-EVENT-EAP-STARTED" in ev:
+        raise Exception("Unexpected EAP exchange")
+    pmksa2 = dev[0].get_pmksa(bssid2)
+    if pmksa2 is None:
+        raise Exception("No PMKSA cache entry created")
+
+    dev[0].dump_monitor()
+    logger.info("Roam back to AP1")
+    dev[0].scan(freq="2412")
+    dev[0].request("ROAM " + bssid)
+    ev = dev[0].wait_event(["CTRL-EVENT-EAP-STARTED",
+                            "CTRL-EVENT-CONNECTED"], timeout=10)
+    if ev is None:
+        raise Exception("Roaming with the AP timed out")
+    if "CTRL-EVENT-EAP-STARTED" in ev:
+        raise Exception("Unexpected EAP exchange")
+
+    pmksa1b = dev[0].get_pmksa(bssid)
+    if pmksa1b is None:
+        raise Exception("No PMKSA cache entry found")
+    if pmksa['pmkid'] != pmksa1b['pmkid']:
+        raise Exception("Unexpected PMKID change for AP1")
+
+def test_pmksa_cache_expiration(dev, apdev):
+    """PMKSA cache entry expiration"""
+    params = hostapd.wpa2_eap_params(ssid="test-pmksa-cache")
+    hostapd.add_ap(apdev[0]['ifname'], params)
+    bssid = apdev[0]['bssid']
+    dev[0].request("SET dot11RSNAConfigPMKLifetime 10")
+    dev[0].connect("test-pmksa-cache", proto="RSN", key_mgmt="WPA-EAP",
+                   eap="GPSK", identity="gpsk user",
+                   password="abcdefghijklmnop0123456789abcdef",
+                   scan_freq="2412")
+    pmksa = dev[0].get_pmksa(bssid)
+    if pmksa is None:
+        raise Exception("No PMKSA cache entry created")
+    logger.info("Wait for PMKSA cache entry to expire")
+    ev = dev[0].wait_event(["WPA: Key negotiation completed",
+                            "CTRL-EVENT-DISCONNECTED"], timeout=15)
+    if ev is None:
+        raise Exception("No EAP reauthentication seen")
+    if "CTRL-EVENT-DISCONNECTED" in ev:
+        raise Exception("Unexpected disconnection")
+    pmksa2 = dev[0].get_pmksa(bssid)
+    if pmksa['pmkid'] == pmksa2['pmkid']:
+        raise Exception("PMKID did not change")

tests/hwsim/wpasupplicant.py

@@ -532,7 +532,7 @@ class WpaSupplicant:
                 eap=None, identity=None, anonymous_identity=None,
                 password=None, phase1=None, phase2=None, ca_cert=None,
                 domain_suffix_match=None, password_hex=None,
-                client_cert=None, private_key=None, peerkey=False,
+                client_cert=None, private_key=None, peerkey=False, okc=False,
                 wait_connect=True, only_add_network=False):
         logger.info("Connect STA " + self.ifname + " to AP")
         id = self.add_network()
@@ -579,6 +579,8 @@ class WpaSupplicant:
                                     domain_suffix_match)
         if peerkey:
             self.set_network(id, "peerkey", "1")
+        if okc:
+            self.set_network(id, "proactive_key_caching", "1")
         if only_add_network:
             return id
         if wait_connect:
@@ -666,3 +668,18 @@ class WpaSupplicant:
             [name,value] = l.split('=', 1)
             vals[name] = value
         return vals
+
+    def get_pmksa(self, bssid):
+        res = self.request("PMKSA")
+        lines = res.splitlines()
+        for l in lines:
+            if bssid not in l:
+                continue
+            vals = dict()
+            [index,aa,pmkid,expiration,opportunistic] = l.split(' ')
+            vals['index'] = index
+            vals['pmkid'] = pmkid
+            vals['expiration'] = expiration
+            vals['opportunistic'] = opportunistic
+            return vals
+        return None