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From: Jouni Malinen <j@w1.fi>
Date: Fri, 22 Sep 2017 12:06:37 +0300
Subject: [PATCH] FT: Do not allow multiple Reassociation Response frames
The driver is expected to not report a second association event without
the station having explicitly request a new association. As such, this
case should not be reachable. However, since reconfiguring the same
pairwise or group keys to the driver could result in nonce reuse issues,
be extra careful here and do an additional state check to avoid this
even if the local driver ends up somehow accepting an unexpected
Reassociation Response frame.
Signed-off-by: Jouni Malinen <j@w1.fi>
---
--- a/src/rsn_supp/wpa.c
+++ b/src/rsn_supp/wpa.c
@@ -2568,6 +2568,9 @@ void wpa_sm_notify_assoc(struct wpa_sm *
#ifdef CONFIG_TDLS
wpa_tdls_assoc(sm);
#endif /* CONFIG_TDLS */
+#ifdef CONFIG_IEEE80211R
+ sm->ft_reassoc_completed = 0;
+#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_P2P
os_memset(sm->p2p_ip_addr, 0, sizeof(sm->p2p_ip_addr));
--- a/src/rsn_supp/wpa_ft.c
+++ b/src/rsn_supp/wpa_ft.c
@@ -153,6 +153,7 @@ static u8 * wpa_ft_gen_req_ies(struct wp
u16 capab;
sm->ft_completed = 0;
+ sm->ft_reassoc_completed = 0;
buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
2 + sm->r0kh_id_len + ric_ies_len + 100;
@@ -681,6 +682,11 @@ int wpa_ft_validate_reassoc_resp(struct
return -1;
}
+ if (sm->ft_reassoc_completed) {
+ wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
+ return 0;
+ }
+
if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
return -1;
@@ -781,6 +787,8 @@ int wpa_ft_validate_reassoc_resp(struct
return -1;
}
+ sm->ft_reassoc_completed = 1;
+
if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
return -1;
--- a/src/rsn_supp/wpa_i.h
+++ b/src/rsn_supp/wpa_i.h
@@ -128,6 +128,7 @@ struct wpa_sm {
size_t r0kh_id_len;
u8 r1kh_id[FT_R1KH_ID_LEN];
int ft_completed;
+ int ft_reassoc_completed;
int over_the_ds_in_progress;
u8 target_ap[ETH_ALEN]; /* over-the-DS target AP */
int set_ptk_after_assoc;
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