[PATCH] AP: Add testing option to delay EAPOL Tx
Andrei Otcheretianski
andrei.otcheretianski at intel.com
Thu Dec 1 08:54:35 PST 2022
From: Daniel Gabay <daniel.gabay at intel.com>
Add a testing option to delay EAPOL messages 1/4 and 3/4.
By setting delay_eapol_tx=1, the actual EAPOL Tx will occur
on the last possible attempt (wpa_pairwise_update_count) thus all
previous attempts will fail on timeout which is the wanted delay.
In addition, add an hwsim test that uses this testing option to verify
that non protected robust management frames are dropped prior to keys
installation in MFP.
Signed-off-by: Daniel Gabay <daniel.gabay at intel.com>
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski at intel.com>
---
hostapd/config_file.c | 2 ++
hostapd/hostapd.conf | 5 +++++
src/ap/ap_config.c | 1 +
src/ap/ap_config.h | 1 +
src/ap/wpa_auth.c | 19 ++++++++++++++++-
src/ap/wpa_auth.h | 1 +
src/ap/wpa_auth_glue.c | 1 +
tests/hwsim/test_ap_pmf.py | 43 ++++++++++++++++++++++++++++++++++++++
8 files changed, 72 insertions(+), 1 deletion(-)
diff --git a/hostapd/config_file.c b/hostapd/config_file.c
index 8a3357c26a..d5953bb048 100644
--- a/hostapd/config_file.c
+++ b/hostapd/config_file.c
@@ -4269,6 +4269,8 @@ static int hostapd_config_fill(struct hostapd_config *conf,
bss->oci_freq_override_wnm_sleep = atoi(pos);
} else if (os_strcmp(buf, "eap_skip_prot_success") == 0) {
bss->eap_skip_prot_success = atoi(pos);
+ } else if (os_strcmp(buf, "delay_eapol_tx") == 0) {
+ conf->delay_eapol_tx = atoi(pos);
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_SAE
} else if (os_strcmp(buf, "sae_password") == 0) {
diff --git a/hostapd/hostapd.conf b/hostapd/hostapd.conf
index 01abd585e6..21c0f8d671 100644
--- a/hostapd/hostapd.conf
+++ b/hostapd/hostapd.conf
@@ -3080,6 +3080,11 @@ own_ip_addr=127.0.0.1
# Include only ECSA IE without CSA IE where possible
# (channel switch operating class is needed)
#ecsa_ie_only=0
+#
+# Delay EAPOL messages 1/4 and 3/4 Tx by not sending the frame until the last
+# attempt (wpa_pairwise_update_count). This will trigger a timeout on all
+# previous attempts and thus delay the frame. (testing only)
+#delay_eapol_tx=0
##### Multiple BSSID support ##################################################
#
diff --git a/src/ap/ap_config.c b/src/ap/ap_config.c
index e83347b832..839b892b2a 100644
--- a/src/ap/ap_config.c
+++ b/src/ap/ap_config.c
@@ -258,6 +258,7 @@ struct hostapd_config * hostapd_config_defaults(void)
conf->ignore_reassoc_probability = 0.0;
conf->corrupt_gtk_rekey_mic_probability = 0.0;
conf->ecsa_ie_only = 0;
+ conf->delay_eapol_tx = 0;
#endif /* CONFIG_TESTING_OPTIONS */
conf->acs = 0;
diff --git a/src/ap/ap_config.h b/src/ap/ap_config.h
index 330c9ed659..2f0424994f 100644
--- a/src/ap/ap_config.h
+++ b/src/ap/ap_config.h
@@ -1075,6 +1075,7 @@ struct hostapd_config {
double ignore_reassoc_probability;
double corrupt_gtk_rekey_mic_probability;
int ecsa_ie_only;
+ bool delay_eapol_tx;
#endif /* CONFIG_TESTING_OPTIONS */
#ifdef CONFIG_ACS
diff --git a/src/ap/wpa_auth.c b/src/ap/wpa_auth.c
index e3dfd8a6a9..c9cd51b1a5 100644
--- a/src/ap/wpa_auth.c
+++ b/src/ap/wpa_auth.c
@@ -1736,10 +1736,27 @@ static void wpa_send_eapol(struct wpa_authenticator *wpa_auth,
if (!sm)
return;
+ ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
+
+#ifdef CONFIG_TESTING_OPTIONS
+ /* in case delay_eapol_tx is true, delay the EAPOL by actually
+ * sending it on the last attempt and therefore all the previous
+ * attempts will fail on timeout.
+ */
+ if (!wpa_auth->conf.delay_eapol_tx ||
+ (wpa_auth->conf.delay_eapol_tx &&
+ ctr == wpa_auth->conf.wpa_pairwise_update_count))
+ __wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde,
+ kde_len, keyidx, encr, 0);
+ else
+ wpa_msg(sm->wpa_auth->conf.msg_ctx, MSG_INFO,
+ "DELAY-EAPOL-TX-%d", ctr);
+
+#else
__wpa_send_eapol(wpa_auth, sm, key_info, key_rsc, nonce, kde, kde_len,
keyidx, encr, 0);
+#endif /* CONFIG_TESTING_OPTIONS */
- ctr = pairwise ? sm->TimeoutCtr : sm->GTimeoutCtr;
if (ctr == 1 && wpa_auth->conf.tx_status)
timeout_ms = pairwise ? eapol_key_timeout_first :
eapol_key_timeout_first_group;
diff --git a/src/ap/wpa_auth.h b/src/ap/wpa_auth.h
index d95b2567e0..eed016accb 100644
--- a/src/ap/wpa_auth.h
+++ b/src/ap/wpa_auth.h
@@ -240,6 +240,7 @@ struct wpa_auth_config {
unsigned int gtk_rsc_override_set:1;
unsigned int igtk_rsc_override_set:1;
int ft_rsnxe_used;
+ bool delay_eapol_tx;
#endif /* CONFIG_TESTING_OPTIONS */
unsigned int oci_freq_override_eapol_m3;
unsigned int oci_freq_override_eapol_g1;
diff --git a/src/ap/wpa_auth_glue.c b/src/ap/wpa_auth_glue.c
index 250d5a1580..a87d2f3899 100644
--- a/src/ap/wpa_auth_glue.c
+++ b/src/ap/wpa_auth_glue.c
@@ -117,6 +117,7 @@ static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
#ifdef CONFIG_TESTING_OPTIONS
wconf->corrupt_gtk_rekey_mic_probability =
iconf->corrupt_gtk_rekey_mic_probability;
+ wconf->delay_eapol_tx = iconf->delay_eapol_tx;
if (conf->own_ie_override &&
wpabuf_len(conf->own_ie_override) <= MAX_OWN_IE_OVERRIDE) {
wconf->own_ie_override_len = wpabuf_len(conf->own_ie_override);
diff --git a/tests/hwsim/test_ap_pmf.py b/tests/hwsim/test_ap_pmf.py
index d83df5d74e..90e629c5ce 100644
--- a/tests/hwsim/test_ap_pmf.py
+++ b/tests/hwsim/test_ap_pmf.py
@@ -1470,3 +1470,46 @@ def test_ap_pmf_sta_global_require2(dev, apdev):
raise Exception("Unexpected connection")
finally:
dev[0].set("pmf", "0")
+
+def test_ap_pmf_drop_robust_mgmt_prior_to_keys_installation(dev, apdev):
+ """Drop non protected robust management frame prior to keys installation"""
+ ssid = "test-pmf-required"
+ passphrase = '12345678'
+ params = hostapd.wpa2_params(ssid=ssid, passphrase=passphrase)
+ params['delay_eapol_tx'] = '1'
+ params['ieee80211w'] = '2'
+ params['wpa_pairwise_update_count'] = '5'
+ hapd = hostapd.add_ap(apdev[0], params, wait_enabled=False)
+
+ # spectrum mgmt with channel switch IE
+ msg = {'fc': 0x00d0,
+ 'sa': hapd.own_addr(),
+ 'da': dev[0].own_addr(),
+ 'bssid': hapd.own_addr(),
+ 'payload': binascii.unhexlify('00042503000608')
+ }
+
+ dev[0].connect(ssid, psk=passphrase, scan_freq='2412', ieee80211w='1',
+ wait_connect=False)
+
+ # wait for the first delay before sending the frame
+ ev = hapd.wait_event(['DELAY-EAPOL-TX-1'], timeout=10)
+ if ev is None:
+ raise Exception("EAPOL is not delayed")
+
+ # send the action frame while connecting (prior to keys installation)
+ hapd.mgmt_tx(msg)
+
+ dev[0].wait_connected(timeout=10, error="Timeout on connection")
+ hwsim_utils.test_connectivity(dev[0], hapd)
+
+ # verify no channel switch event
+ ev = dev[0].wait_event(['CTRL-EVENT-STARTED-CHANNEL-SWITCH'], timeout=5)
+ if ev is not None:
+ raise Exception("Unexpected CSA prior to keys installation")
+
+ # send the frame after keys installation and verify channel switch event
+ hapd.mgmt_tx(msg)
+ ev = dev[0].wait_event(['CTRL-EVENT-STARTED-CHANNEL-SWITCH'], timeout=5)
+ if ev is None:
+ raise Exception("Excpeted CSA handling after keys installation")
--
2.25.1
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