PMKSA: Show AP/mesh PMKSA list in PMKSA command

This extends the wpa_supplicant PMKSA control interface command to allow
the PMKSA list from the authenticator side to be listed for AP and mesh
mode. In addition, this adds a hostapd PMKSA control interface command
to show the same list for the AP case.

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

src/ap/ctrl_iface_ap.c

@@ -568,3 +568,10 @@ int hostapd_ctrl_iface_stop_ap(struct hostapd_data *hapd)
 {
 	return hostapd_drv_stop_ap(hapd);
 }
+
+
+int hostapd_ctrl_iface_pmksa_list(struct hostapd_data *hapd, char *buf,
+				  size_t len)
+{
+	return wpa_auth_pmksa_list(hapd->wpa_auth, buf, len);
+}

src/ap/ctrl_iface_ap.h

@@ -24,5 +24,7 @@ int hostapd_ctrl_iface_status(struct hostapd_data *hapd, char *buf,
 int hostapd_parse_csa_settings(const char *pos,
 			       struct csa_settings *settings);
 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);
 
 #endif /* CTRL_IFACE_AP_H */

src/ap/pmksa_cache_auth.c

@@ -547,3 +547,48 @@ int pmksa_cache_auth_radius_das_disconnect(struct rsn_pmksa_cache *pmksa,
 
 	return found ? 0 : -1;
 }
+
+
+/**
+ * pmksa_cache_auth_list - Dump text list of entries in PMKSA cache
+ * @pmksa: Pointer to PMKSA cache data from pmksa_cache_auth_init()
+ * @buf: Buffer for the list
+ * @len: Length of the buffer
+ * Returns: Number of bytes written to buffer
+ *
+ * This function is used to generate a text format representation of the
+ * current PMKSA cache contents for the ctrl_iface PMKSA command.
+ */
+int pmksa_cache_auth_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
+{
+	int i, ret;
+	char *pos = buf;
+	struct rsn_pmksa_cache_entry *entry;
+	struct os_reltime now;
+
+	os_get_reltime(&now);
+	ret = os_snprintf(pos, buf + len - pos,
+			  "Index / SPA / PMKID / expiration (in seconds) / opportunistic\n");
+	if (os_snprintf_error(buf + len - pos, ret))
+		return pos - buf;
+	pos += ret;
+	i = 0;
+	entry = pmksa->pmksa;
+	while (entry) {
+		ret = os_snprintf(pos, buf + len - pos, "%d " MACSTR " ",
+				  i, MAC2STR(entry->spa));
+		if (os_snprintf_error(buf + len - pos, ret))
+			return pos - buf;
+		pos += ret;
+		pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,
+					PMKID_LEN);
+		ret = os_snprintf(pos, buf + len - pos, " %d %d\n",
+				  (int) (entry->expiration - now.sec),
+				  entry->opportunistic);
+		if (os_snprintf_error(buf + len - pos, ret))
+			return pos - buf;
+		pos += ret;
+		entry = entry->next;
+	}
+	return pos - buf;
+}

src/ap/pmksa_cache_auth.h

@@ -63,5 +63,6 @@ void pmksa_cache_free_entry(struct rsn_pmksa_cache *pmksa,
 			    struct rsn_pmksa_cache_entry *entry);
 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);
 
 #endif /* PMKSA_CACHE_H */

src/ap/wpa_auth.c

@@ -3359,6 +3359,15 @@ void wpa_auth_pmksa_remove(struct wpa_authenticator *wpa_auth,
 }
 
 
+int wpa_auth_pmksa_list(struct wpa_authenticator *wpa_auth, char *buf,
+			size_t len)
+{
+	if (!wpa_auth || !wpa_auth->pmksa)
+		return 0;
+	return pmksa_cache_auth_list(wpa_auth->pmksa, buf, len);
+}
+
+
 /*
  * 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

@@ -298,6 +298,8 @@ int wpa_auth_pmksa_add_sae(struct wpa_authenticator *wpa_auth, const u8 *addr,
 			   const u8 *pmk, const u8 *pmkid);
 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);
 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);