PMKSA: Flush AP/mesh PMKSA cache by PMKSA_FLUSH command

This extends the wpa_supplicant PMKSA_FLUSH control interface command to
allow the PMKSA list from the authenticator side to be flushed for AP
and mesh mode. In addition, this adds a hostapd PMKSA_FLUSH control
interface command to flush the PMKSA entries.

Signed-off-by: Masashi Honma <masashi.honma@gmail.com>

hostapd/ctrl_iface.c

@@ -2310,6 +2310,8 @@ static int hostapd_ctrl_iface_receive_process(struct hostapd_data *hapd,
 	} else if (os_strcmp(buf, "PMKSA") == 0) {
 		reply_len = hostapd_ctrl_iface_pmksa_list(hapd, reply,
 							  reply_size);
+	} else if (os_strcmp(buf, "PMKSA_FLUSH") == 0) {
+		hostapd_ctrl_iface_pmksa_flush(hapd);
 	} else {
 		os_memcpy(reply, "UNKNOWN COMMAND\n", 16);
 		reply_len = 16;

hostapd/hostapd_cli.c

@@ -1136,6 +1136,13 @@ static int hostapd_cli_cmd_pmksa(struct wpa_ctrl *ctrl, int argc, char *argv[])
 }
 
 
+static int hostapd_cli_cmd_pmksa_flush(struct wpa_ctrl *ctrl, int argc,
+				       char *argv[])
+{
+	return wpa_ctrl_command(ctrl, "PMKSA_FLUSH");
+}
+
+
 struct hostapd_cli_cmd {
 	const char *cmd;
 	int (*handler)(struct wpa_ctrl *ctrl, int argc, char *argv[]);
@@ -1196,6 +1203,7 @@ static const struct hostapd_cli_cmd hostapd_cli_commands[] = {
 	{ "erp_flush", hostapd_cli_cmd_erp_flush },
 	{ "log_level", hostapd_cli_cmd_log_level },
 	{ "pmksa", hostapd_cli_cmd_pmksa },
+	{ "pmksa_flush", hostapd_cli_cmd_pmksa_flush },
 	{ NULL, NULL }
 };
 

src/ap/ctrl_iface_ap.c

@@ -575,3 +575,9 @@ int hostapd_ctrl_iface_pmksa_list(struct hostapd_data *hapd, char *buf,
 {
 	return wpa_auth_pmksa_list(hapd->wpa_auth, buf, len);
 }
+
+
+void hostapd_ctrl_iface_pmksa_flush(struct hostapd_data *hapd)
+{
+	wpa_auth_pmksa_flush(hapd->wpa_auth);
+}

src/ap/ctrl_iface_ap.h

@@ -26,5 +26,6 @@ int hostapd_parse_csa_settings(const char *pos,
 int hostapd_ctrl_iface_stop_ap(struct hostapd_data *hapd);
 int hostapd_ctrl_iface_pmksa_list(struct hostapd_data *hapd, char *buf,
 				  size_t len);
+void hostapd_ctrl_iface_pmksa_flush(struct hostapd_data *hapd);
 
 #endif /* CTRL_IFACE_AP_H */

src/ap/pmksa_cache_auth.c

@@ -92,6 +92,20 @@ void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
 }
 
 
+/**
+ * pmksa_cache_auth_flush - Flush all PMKSA cache entries
+ * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
+ */
+void pmksa_cache_auth_flush(struct rsn_pmksa_cache *pmksa)
+{
+	while (pmksa->pmksa) {
+		wpa_printf(MSG_DEBUG, "RSN: Flush PMKSA cache entry for "
+			   MACSTR, MAC2STR(pmksa->pmksa->spa));
+		pmksa_cache_free_entry(pmksa, pmksa->pmksa);
+	}
+}
+
+
 static void pmksa_cache_expire(void *eloop_ctx, void *timeout_ctx)
 {
 	struct rsn_pmksa_cache *pmksa = eloop_ctx;

src/ap/pmksa_cache_auth.h

@@ -64,5 +64,6 @@ void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
 int pmksa_cache_auth_radius_das_disconnect(struct rsn_pmksa_cache *pmksa,
 					   struct radius_das_attrs *attr);
 int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len);
+void pmksa_cache_auth_flush(struct rsn_pmksa_cache *pmksa);
 
 #endif /* PMKSA_CACHE_H */

src/ap/wpa_auth.c

@@ -3368,6 +3368,13 @@ int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
 }
 
 
+void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth)
+{
+	if (wpa_auth && wpa_auth->pmksa)
+		pmksa_cache_auth_flush(wpa_auth->pmksa);
+}
+
+
 /*
  * Remove and free the group from wpa_authenticator. This is triggered by a
  * callback to make sure nobody is currently iterating the group list while it

src/ap/wpa_auth.h

@@ -300,6 +300,7 @@ void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
 			   const u8 *sta_addr);
 int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
 			size_t len);
+void wpa_auth_pmksa_flush(struct wpa_authenticator *wpa_auth);
 int wpa_auth_sta_set_vlan(struct wpa_state_machine *sm, int vlan_id);
 void wpa_auth_eapol_key_tx_status(struct wpa_authenticator *wpa_auth,
 				  struct wpa_state_machine *sm, int ack);

wpa_supplicant/ap.c

@@ -1404,6 +1404,20 @@ int wpas_ap_pmksa_cache_list(struct wpa_supplicant *wpa_s, char *buf,
 }
 
 
+void wpas_ap_pmksa_cache_flush(struct wpa_supplicant *wpa_s)
+{
+	size_t i;
+
+	if (wpa_s->ap_iface) {
+		for (i = 0; i < wpa_s->ap_iface->num_bss; i++)
+			hostapd_ctrl_iface_pmksa_flush(wpa_s->ap_iface->bss[i]);
+	}
+
+	if (wpa_s->ifmsh)
+		hostapd_ctrl_iface_pmksa_flush(wpa_s->ifmsh->bss[0]);
+}
+
+
 #ifdef NEED_AP_MLME
 void wpas_event_dfs_radar_detected(struct wpa_supplicant *wpa_s,
 				   struct dfs_event *radar)

wpa_supplicant/ap.h

@@ -84,6 +84,7 @@ int wpas_ap_stop_ap(struct wpa_supplicant *wpa_s);
 
 int wpas_ap_pmksa_cache_list(struct wpa_supplicant *wpa_s, char *buf,
 			     size_t len);
+void wpas_ap_pmksa_cache_flush(struct wpa_supplicant *wpa_s);
 
 void wpas_event_dfs_radar_detected(struct wpa_supplicant *wpa_s,
 				   struct dfs_event *radar);

wpa_supplicant/ctrl_iface.c

@@ -8368,6 +8368,15 @@ static int wpas_ctrl_iface_pmksa(struct wpa_supplicant *wpa_s,
 }
 
 
+static void wpas_ctrl_iface_pmksa_flush(struct wpa_supplicant *wpa_s)
+{
+	wpa_sm_pmksa_cache_flush(wpa_s->wpa, NULL);
+#ifdef CONFIG_AP
+	wpas_ap_pmksa_cache_flush(wpa_s);
+#endif /* CONFIG_AP */
+}
+
+
 static int wpas_ctrl_cmd_debug_level(const char *cmd)
 {
 	if (os_strcmp(cmd, "PING") == 0 ||
@@ -8441,7 +8450,7 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 	} else if (os_strcmp(buf, "PMKSA") == 0) {
 		reply_len = wpas_ctrl_iface_pmksa(wpa_s, reply, reply_size);
 	} else if (os_strcmp(buf, "PMKSA_FLUSH") == 0) {
-		wpa_sm_pmksa_cache_flush(wpa_s->wpa, NULL);
+		wpas_ctrl_iface_pmksa_flush(wpa_s);
 	} else if (os_strncmp(buf, "SET ", 4) == 0) {
 		if (wpa_supplicant_ctrl_iface_set(wpa_s, buf + 4))
 			reply_len = -1;