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From b372ab0b7daea719749194dc554b26e6367603f2 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <j@w1.fi>
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Date: Fri, 22 Sep 2017 12:06:37 +0300
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Subject: [PATCH 8/8] FT: Do not allow multiple Reassociation Response frames
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The driver is expected to not report a second association event without
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the station having explicitly request a new association. As such, this
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case should not be reachable. However, since reconfiguring the same
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pairwise or group keys to the driver could result in nonce reuse issues,
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be extra careful here and do an additional state check to avoid this
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even if the local driver ends up somehow accepting an unexpected
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Reassociation Response frame.
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Signed-off-by: Jouni Malinen <j@w1.fi>
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---
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src/rsn_supp/wpa.c | 3 +++
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src/rsn_supp/wpa_ft.c | 8 ++++++++
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src/rsn_supp/wpa_i.h | 1 +
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3 files changed, 12 insertions(+)
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diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c
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index 0550a41..2a53c6f 100644
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--- a/src/rsn_supp/wpa.c
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+++ b/src/rsn_supp/wpa.c
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@@ -2440,6 +2440,9 @@ void wpa_sm_notify_disassoc(struct wpa_sm *sm)
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#ifdef CONFIG_TDLS
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wpa_tdls_disassoc(sm);
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#endif /* CONFIG_TDLS */
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+#ifdef CONFIG_IEEE80211R
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+ sm->ft_reassoc_completed = 0;
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+#endif /* CONFIG_IEEE80211R */
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/* Keys are not needed in the WPA state machine anymore */
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wpa_sm_drop_sa(sm);
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diff --git a/src/rsn_supp/wpa_ft.c b/src/rsn_supp/wpa_ft.c
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index 205793e..d45bb45 100644
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--- a/src/rsn_supp/wpa_ft.c
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+++ b/src/rsn_supp/wpa_ft.c
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@@ -153,6 +153,7 @@ static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len,
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u16 capab;
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sm->ft_completed = 0;
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+ sm->ft_reassoc_completed = 0;
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buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
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2 + sm->r0kh_id_len + ric_ies_len + 100;
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@@ -681,6 +682,11 @@ int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
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return -1;
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}
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+ if (sm->ft_reassoc_completed) {
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+ wpa_printf(MSG_DEBUG, "FT: Reassociation has already been completed for this FT protocol instance - ignore unexpected retransmission");
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+ return 0;
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+ }
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+
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if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) {
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wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs");
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return -1;
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@@ -781,6 +787,8 @@ int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies,
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return -1;
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}
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+ sm->ft_reassoc_completed = 1;
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+
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if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0)
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return -1;
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diff --git a/src/rsn_supp/wpa_i.h b/src/rsn_supp/wpa_i.h
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index 41f371f..56f88dc 100644
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--- a/src/rsn_supp/wpa_i.h
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+++ b/src/rsn_supp/wpa_i.h
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@@ -128,6 +128,7 @@ struct wpa_sm {
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size_t r0kh_id_len;
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u8 r1kh_id[FT_R1KH_ID_LEN];
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int ft_completed;
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+ int ft_reassoc_completed;
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int over_the_ds_in_progress;
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u8 target_ap[ETH_ALEN]; /* over-the-DS target AP */
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int set_ptk_after_assoc;
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--
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2.7.4
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