wok view wpa_supplicant/stuff/rebased-v2.6-0001-hostapd-Avoid-key-reinstallation-in-FT-handshake.patch @ rev 21612

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author Pascal Bellard <pascal.bellard@slitaz.org>
date Thu May 23 17:32:52 2019 +0200 (2019-05-23)
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1 From cf4cab804c7afd5c45505528a8d16e46163243a2 Mon Sep 17 00:00:00 2001
2 From: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
3 Date: Fri, 14 Jul 2017 15:15:35 +0200
4 Subject: [PATCH 1/8] hostapd: Avoid key reinstallation in FT handshake
5
6 Do not reinstall TK to the driver during Reassociation Response frame
7 processing if the first attempt of setting the TK succeeded. This avoids
8 issues related to clearing the TX/RX PN that could result in reusing
9 same PN values for transmitted frames (e.g., due to CCM nonce reuse and
10 also hitting replay protection on the receiver) and accepting replayed
11 frames on RX side.
12
13 This issue was introduced by the commit
14 0e84c25434e6a1f283c7b4e62e483729085b78d2 ('FT: Fix PTK configuration in
15 authenticator') which allowed wpa_ft_install_ptk() to be called multiple
16 times with the same PTK. While the second configuration attempt is
17 needed with some drivers, it must be done only if the first attempt
18 failed.
19
20 Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
21 ---
22 src/ap/ieee802_11.c | 16 +++++++++++++---
23 src/ap/wpa_auth.c | 11 +++++++++++
24 src/ap/wpa_auth.h | 3 ++-
25 src/ap/wpa_auth_ft.c | 10 ++++++++++
26 src/ap/wpa_auth_i.h | 1 +
27 5 files changed, 37 insertions(+), 4 deletions(-)
28
29 diff --git a/src/ap/ieee802_11.c b/src/ap/ieee802_11.c
30 index 4e04169..333035f 100644
31 --- a/src/ap/ieee802_11.c
32 +++ b/src/ap/ieee802_11.c
33 @@ -1841,6 +1841,7 @@ static int add_associated_sta(struct hostapd_data *hapd,
34 {
35 struct ieee80211_ht_capabilities ht_cap;
36 struct ieee80211_vht_capabilities vht_cap;
37 + int set = 1;
38
39 /*
40 * Remove the STA entry to ensure the STA PS state gets cleared and
41 @@ -1848,9 +1849,18 @@ static int add_associated_sta(struct hostapd_data *hapd,
42 * FT-over-the-DS, where a station re-associates back to the same AP but
43 * skips the authentication flow, or if working with a driver that
44 * does not support full AP client state.
45 + *
46 + * Skip this if the STA has already completed FT reassociation and the
47 + * TK has been configured since the TX/RX PN must not be reset to 0 for
48 + * the same key.
49 */
50 - if (!sta->added_unassoc)
51 + if (!sta->added_unassoc &&
52 + (!(sta->flags & WLAN_STA_AUTHORIZED) ||
53 + !wpa_auth_sta_ft_tk_already_set(sta->wpa_sm))) {
54 hostapd_drv_sta_remove(hapd, sta->addr);
55 + wpa_auth_sm_event(sta->wpa_sm, WPA_DRV_STA_REMOVED);
56 + set = 0;
57 + }
58
59 #ifdef CONFIG_IEEE80211N
60 if (sta->flags & WLAN_STA_HT)
61 @@ -1873,11 +1883,11 @@ static int add_associated_sta(struct hostapd_data *hapd,
62 sta->flags & WLAN_STA_VHT ? &vht_cap : NULL,
63 sta->flags | WLAN_STA_ASSOC, sta->qosinfo,
64 sta->vht_opmode, sta->p2p_ie ? 1 : 0,
65 - sta->added_unassoc)) {
66 + set)) {
67 hostapd_logger(hapd, sta->addr,
68 HOSTAPD_MODULE_IEEE80211, HOSTAPD_LEVEL_NOTICE,
69 "Could not %s STA to kernel driver",
70 - sta->added_unassoc ? "set" : "add");
71 + set ? "set" : "add");
72
73 if (sta->added_unassoc) {
74 hostapd_drv_sta_remove(hapd, sta->addr);
75 diff --git a/src/ap/wpa_auth.c b/src/ap/wpa_auth.c
76 index 3587086..707971d 100644
77 --- a/src/ap/wpa_auth.c
78 +++ b/src/ap/wpa_auth.c
79 @@ -1745,6 +1745,9 @@ int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event)
80 #else /* CONFIG_IEEE80211R */
81 break;
82 #endif /* CONFIG_IEEE80211R */
83 + case WPA_DRV_STA_REMOVED:
84 + sm->tk_already_set = FALSE;
85 + return 0;
86 }
87
88 #ifdef CONFIG_IEEE80211R
89 @@ -3250,6 +3253,14 @@ int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm)
90 }
91
92
93 +int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm)
94 +{
95 + if (!sm || !wpa_key_mgmt_ft(sm->wpa_key_mgmt))
96 + return 0;
97 + return sm->tk_already_set;
98 +}
99 +
100 +
101 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
102 struct rsn_pmksa_cache_entry *entry)
103 {
104 diff --git a/src/ap/wpa_auth.h b/src/ap/wpa_auth.h
105 index 0de8d97..97461b0 100644
106 --- a/src/ap/wpa_auth.h
107 +++ b/src/ap/wpa_auth.h
108 @@ -267,7 +267,7 @@ void wpa_receive(struct wpa_authenticator *wpa_auth,
109 u8 *data, size_t data_len);
110 enum wpa_event {
111 WPA_AUTH, WPA_ASSOC, WPA_DISASSOC, WPA_DEAUTH, WPA_REAUTH,
112 - WPA_REAUTH_EAPOL, WPA_ASSOC_FT
113 + WPA_REAUTH_EAPOL, WPA_ASSOC_FT, WPA_DRV_STA_REMOVED
114 };
115 void wpa_remove_ptk(struct wpa_state_machine *sm);
116 int wpa_auth_sm_event(struct wpa_state_machine *sm, enum wpa_event event);
117 @@ -280,6 +280,7 @@ int wpa_auth_pairwise_set(struct wpa_state_machine *sm);
118 int wpa_auth_get_pairwise(struct wpa_state_machine *sm);
119 int wpa_auth_sta_key_mgmt(struct wpa_state_machine *sm);
120 int wpa_auth_sta_wpa_version(struct wpa_state_machine *sm);
121 +int wpa_auth_sta_ft_tk_already_set(struct wpa_state_machine *sm);
122 int wpa_auth_sta_clear_pmksa(struct wpa_state_machine *sm,
123 struct rsn_pmksa_cache_entry *entry);
124 struct rsn_pmksa_cache_entry *
125 diff --git a/src/ap/wpa_auth_ft.c b/src/ap/wpa_auth_ft.c
126 index 42242a5..e63b99a 100644
127 --- a/src/ap/wpa_auth_ft.c
128 +++ b/src/ap/wpa_auth_ft.c
129 @@ -780,6 +780,14 @@ void wpa_ft_install_ptk(struct wpa_state_machine *sm)
130 return;
131 }
132
133 + if (sm->tk_already_set) {
134 + /* Must avoid TK reconfiguration to prevent clearing of TX/RX
135 + * PN in the driver */
136 + wpa_printf(MSG_DEBUG,
137 + "FT: Do not re-install same PTK to the driver");
138 + return;
139 + }
140 +
141 /* FIX: add STA entry to kernel/driver here? The set_key will fail
142 * most likely without this.. At the moment, STA entry is added only
143 * after association has been completed. This function will be called
144 @@ -792,6 +800,7 @@ void wpa_ft_install_ptk(struct wpa_state_machine *sm)
145
146 /* FIX: MLME-SetProtection.Request(TA, Tx_Rx) */
147 sm->pairwise_set = TRUE;
148 + sm->tk_already_set = TRUE;
149 }
150
151
152 @@ -898,6 +907,7 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
153
154 sm->pairwise = pairwise;
155 sm->PTK_valid = TRUE;
156 + sm->tk_already_set = FALSE;
157 wpa_ft_install_ptk(sm);
158
159 buflen = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) +
160 diff --git a/src/ap/wpa_auth_i.h b/src/ap/wpa_auth_i.h
161 index 72b7eb3..7fd8f05 100644
162 --- a/src/ap/wpa_auth_i.h
163 +++ b/src/ap/wpa_auth_i.h
164 @@ -65,6 +65,7 @@ struct wpa_state_machine {
165 struct wpa_ptk PTK;
166 Boolean PTK_valid;
167 Boolean pairwise_set;
168 + Boolean tk_already_set;
169 int keycount;
170 Boolean Pair;
171 struct wpa_key_replay_counter {
172 --
173 2.7.4
174