[openwrt/staging/hauke.git] /

From: Jouni Malinen <j@w1.fi>
Date: Sun, 1 Oct 2017 12:12:24 +0300
Subject: [PATCH] Extend protection of GTK/IGTK reinstallation of WNM-Sleep
 Mode cases

This extends the protection to track last configured GTK/IGTK value
separately from EAPOL-Key frames and WNM-Sleep Mode frames to cover a
corner case where these two different mechanisms may get used when the
GTK/IGTK has changed and tracking a single value is not sufficient to
detect a possible key reconfiguration.

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

--- a/src/rsn_supp/wpa.c
+++ b/src/rsn_supp/wpa.c
@@ -795,14 +795,17 @@ struct wpa_gtk_data {
 
 static int wpa_supplicant_install_gtk(struct wpa_sm *sm,
                                      const struct wpa_gtk_data *gd,
-                                     const u8 *key_rsc)
+                                     const u8 *key_rsc, int wnm_sleep)
 {
        const u8 *_gtk = gd->gtk;
        u8 gtk_buf[32];
 
        /* Detect possible key reinstallation */
-       if (sm->gtk.gtk_len == (size_t) gd->gtk_len &&
-           os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) {
+       if ((sm->gtk.gtk_len == (size_t) gd->gtk_len &&
+            os_memcmp(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len) == 0) ||
+           (sm->gtk_wnm_sleep.gtk_len == (size_t) gd->gtk_len &&
+            os_memcmp(sm->gtk_wnm_sleep.gtk, gd->gtk,
+                      sm->gtk_wnm_sleep.gtk_len) == 0)) {
                wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
                        "WPA: Not reinstalling already in-use GTK to the driver (keyidx=%d tx=%d len=%d)",
                        gd->keyidx, gd->tx, gd->gtk_len);
@@ -843,8 +846,14 @@ static int wpa_supplicant_install_gtk(st
        }
        os_memset(gtk_buf, 0, sizeof(gtk_buf));
 
-       sm->gtk.gtk_len = gd->gtk_len;
-       os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len);
+       if (wnm_sleep) {
+               sm->gtk_wnm_sleep.gtk_len = gd->gtk_len;
+               os_memcpy(sm->gtk_wnm_sleep.gtk, gd->gtk,
+                         sm->gtk_wnm_sleep.gtk_len);
+       } else {
+               sm->gtk.gtk_len = gd->gtk_len;
+               os_memcpy(sm->gtk.gtk, gd->gtk, sm->gtk.gtk_len);
+       }
 
        return 0;
 }
@@ -938,7 +947,7 @@ static int wpa_supplicant_pairwise_gtk(s
            (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
                                               gtk_len, gtk_len,
                                               &gd.key_rsc_len, &gd.alg) ||
-            wpa_supplicant_install_gtk(sm, &gd, key_rsc))) {
+            wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0))) {
                wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
                        "RSN: Failed to install GTK");
                os_memset(&gd, 0, sizeof(gd));
@@ -954,14 +963,18 @@ static int wpa_supplicant_pairwise_gtk(s
 
 #ifdef CONFIG_IEEE80211W
 static int wpa_supplicant_install_igtk(struct wpa_sm *sm,
-                                      const struct wpa_igtk_kde *igtk)
+                                      const struct wpa_igtk_kde *igtk,
+                                      int wnm_sleep)
 {
        size_t len = wpa_cipher_key_len(sm->mgmt_group_cipher);
        u16 keyidx = WPA_GET_LE16(igtk->keyid);
 
        /* Detect possible key reinstallation */
-       if (sm->igtk.igtk_len == len &&
-           os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) {
+       if ((sm->igtk.igtk_len == len &&
+            os_memcmp(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len) == 0) ||
+           (sm->igtk_wnm_sleep.igtk_len == len &&
+            os_memcmp(sm->igtk_wnm_sleep.igtk, igtk->igtk,
+                      sm->igtk_wnm_sleep.igtk_len) == 0)) {
                wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
                        "WPA: Not reinstalling already in-use IGTK to the driver (keyidx=%d)",
                        keyidx);
@@ -986,8 +999,14 @@ static int wpa_supplicant_install_igtk(s
                return -1;
        }
 
-       sm->igtk.igtk_len = len;
-       os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len);
+       if (wnm_sleep) {
+               sm->igtk_wnm_sleep.igtk_len = len;
+               os_memcpy(sm->igtk_wnm_sleep.igtk, igtk->igtk,
+                         sm->igtk_wnm_sleep.igtk_len);
+       } else {
+               sm->igtk.igtk_len = len;
+               os_memcpy(sm->igtk.igtk, igtk->igtk, sm->igtk.igtk_len);
+       }
 
        return 0;
 }
@@ -1010,7 +1029,7 @@ static int ieee80211w_set_keys(struct wp
                        return -1;
 
                igtk = (const struct wpa_igtk_kde *) ie->igtk;
-               if (wpa_supplicant_install_igtk(sm, igtk) < 0)
+               if (wpa_supplicant_install_igtk(sm, igtk, 0) < 0)
                        return -1;
        }
 
@@ -1659,7 +1678,7 @@ static void wpa_supplicant_process_1_of_
        if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
                key_rsc = null_rsc;
 
-       if (wpa_supplicant_install_gtk(sm, &gd, key_rsc) ||
+       if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0) ||
            wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0)
                goto failed;
        os_memset(&gd, 0, sizeof(gd));
@@ -2580,8 +2599,10 @@ void wpa_sm_notify_assoc(struct wpa_sm *
                sm->tptk_set = 0;
                os_memset(&sm->tptk, 0, sizeof(sm->tptk));
                os_memset(&sm->gtk, 0, sizeof(sm->gtk));
+               os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
 #ifdef CONFIG_IEEE80211W
                os_memset(&sm->igtk, 0, sizeof(sm->igtk));
+               os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
 #endif /* CONFIG_IEEE80211W */
        }
 
@@ -3160,8 +3181,10 @@ void wpa_sm_drop_sa(struct wpa_sm *sm)
        os_memset(&sm->ptk, 0, sizeof(sm->ptk));
        os_memset(&sm->tptk, 0, sizeof(sm->tptk));
        os_memset(&sm->gtk, 0, sizeof(sm->gtk));
+       os_memset(&sm->gtk_wnm_sleep, 0, sizeof(sm->gtk_wnm_sleep));
 #ifdef CONFIG_IEEE80211W
        os_memset(&sm->igtk, 0, sizeof(sm->igtk));
+       os_memset(&sm->igtk_wnm_sleep, 0, sizeof(sm->igtk_wnm_sleep));
 #endif /* CONFIG_IEEE80211W */
 #ifdef CONFIG_IEEE80211R
        os_memset(sm->xxkey, 0, sizeof(sm->xxkey));
@@ -3226,7 +3249,7 @@ int wpa_wnmsleep_install_key(struct wpa_
 
                wpa_hexdump_key(MSG_DEBUG, "Install GTK (WNM SLEEP)",
                                gd.gtk, gd.gtk_len);
-               if (wpa_supplicant_install_gtk(sm, &gd, key_rsc)) {
+               if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 1)) {
                        os_memset(&gd, 0, sizeof(gd));
                        wpa_printf(MSG_DEBUG, "Failed to install the GTK in "
                                   "WNM mode");
@@ -3238,7 +3261,7 @@ int wpa_wnmsleep_install_key(struct wpa_
                const struct wpa_igtk_kde *igtk;
 
                igtk = (const struct wpa_igtk_kde *) (buf + 2);
-               if (wpa_supplicant_install_igtk(sm, igtk) < 0)
+               if (wpa_supplicant_install_igtk(sm, igtk, 1) < 0)
                        return -1;
 #endif /* CONFIG_IEEE80211W */
        } else {
@@ -4121,7 +4144,7 @@ int fils_process_assoc_resp(struct wpa_s
        os_memcpy(gd.gtk, kde.gtk + 2, kde.gtk_len - 2);
 
        wpa_printf(MSG_DEBUG, "FILS: Set GTK to driver");
-       if (wpa_supplicant_install_gtk(sm, &gd, elems.key_delivery) < 0) {
+       if (wpa_supplicant_install_gtk(sm, &gd, elems.key_delivery, 0) < 0) {
                wpa_printf(MSG_DEBUG, "FILS: Failed to set GTK");
                goto fail;
        }
--- a/src/rsn_supp/wpa_i.h
+++ b/src/rsn_supp/wpa_i.h
@@ -32,8 +32,10 @@ struct wpa_sm {
        int rx_replay_counter_set;
        u8 request_counter[WPA_REPLAY_COUNTER_LEN];
        struct wpa_gtk gtk;
+       struct wpa_gtk gtk_wnm_sleep;
 #ifdef CONFIG_IEEE80211W
        struct wpa_igtk igtk;
+       struct wpa_igtk igtk_wnm_sleep;
 #endif /* CONFIG_IEEE80211W */
 
        struct eapol_sm *eapol; /* EAPOL state machine from upper level code */