[RFC PATCH 4/4] keep and use list of PSK entries per station

[Michael Braun]

This updates struct sta_info to keep a linked list of PSKs per station and
lets hostapd_wpa_auth_get_psk iterate over all those entries, too.

---
 src/ap/ieee802_11.c    |   13 +++++++------
 src/ap/sta_info.c      |    6 +++++-
 src/ap/sta_info.h      |    2 +-
 src/ap/wpa_auth_glue.c |   15 +++++++++++----
 4 files changed, 24 insertions(+), 12 deletions(-)

diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
index 246b773..5379cbf 100644
--- a/src/ap/ieee802_11.c
+++ b/src/ap/ieee802_11.c
@@ -412,13 +412,14 @@ static void handle_auth(struct hostapd_data *hapd,
 			       HOSTAPD_LEVEL_INFO, "VLAN ID %d", sta->vlan_id);
 	}
 
-	if (psk && hapd->conf->wpa_psk_radius != PSK_RADIUS_IGNORED) {
-		os_free(sta->psk);
-		sta->psk = os_malloc(PMK_LEN);
-		if (sta->psk)
-			os_memcpy(sta->psk, psk->psk, PMK_LEN);
+	while (sta->psk) {
+		struct hostapd_sta_wpa_psk_short *prev = sta->psk;
+		sta->psk = sta->psk->next;
+		os_free(prev);
+	}
+	if (hapd->conf->wpa_psk_radius != PSK_RADIUS_IGNORED) {
+		sta->psk = psk; psk = NULL;
 	} else {
-		os_free(sta->psk);
 		sta->psk = NULL;
 	}
 
diff --git a/src/ap/sta_info.c b/src/ap/sta_info.c
index d61177f..b033f7c 100644
--- a/src/ap/sta_info.c
+++ b/src/ap/sta_info.c
@@ -234,7 +234,11 @@ void ap_free_sta(struct hostapd_data *hapd, struct sta_info *sta)
 	wpabuf_free(sta->p2p_ie);
 
 	os_free(sta->ht_capabilities);
-	os_free(sta->psk);
+	while (sta->psk) {
+		struct hostapd_sta_wpa_psk_short* prev = sta->psk;
+		sta->psk = sta->psk->next;
+		os_free(prev);
+	}
 	os_free(sta->identity);
 	os_free(sta->radius_cui);
 
diff --git a/src/ap/sta_info.h b/src/ap/sta_info.h
index b3c57b4..e5213d4 100644
--- a/src/ap/sta_info.h
+++ b/src/ap/sta_info.h
@@ -95,7 +95,7 @@ struct sta_info {
 	struct hostapd_ssid *ssid_probe; /* SSID selection based on ProbeReq */
 
 	int vlan_id;
-	u8 *psk; /* PSK from RADIUS authentication server */
+	struct hostapd_sta_wpa_psk_short *psk; /* PSKs from RADIUS authentication server */
 
 	char *identity; /* User-Name from RADIUS */
 	char *radius_cui; /* Chargeable-User-Identity from RADIUS */
diff --git a/src/ap/wpa_auth_glue.c b/src/ap/wpa_auth_glue.c
index bdc89e4..21eb3b2 100644
--- a/src/ap/wpa_auth_glue.c
+++ b/src/ap/wpa_auth_glue.c
@@ -16,12 +16,12 @@
 #include "l2_packet/l2_packet.h"
 #include "drivers/driver.h"
 #include "hostapd.h"
+#include "ap_config.h"
 #include "ieee802_1x.h"
 #include "preauth_auth.h"
 #include "sta_info.h"
 #include "tkip_countermeasures.h"
 #include "ap_drv_ops.h"
-#include "ap_config.h"
 #include "wpa_auth.h"
 #include "wpa_auth_glue.h"
 
@@ -188,10 +188,17 @@ static const u8 * hostapd_wpa_auth_get_psk(void *ctx, const u8 *addr,
 	/*
 	 * This is about to iterate over all psks, prev_psk gives the last
 	 * returned psk which should not be returned again.
-	 * logic list (all hostapd_get_psk; sta->psk)
+	 * logic list (all hostapd_get_psk; all sta->psk)
 	 */
-	if (sta && sta->psk && !psk && sta->psk != prev_psk)
-		psk = sta->psk;
+	if (sta && sta->psk && !psk) {
+		struct hostapd_sta_wpa_psk_short* pos;
+		for (pos = sta->psk; pos; pos = pos->next) {
+			if (pos->psk == prev_psk && pos->next)  {
+				psk = pos->next->psk;
+				break;
+			}
+		}
+	}
 	return psk;
 }