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WPA: Support deriving KDK based on capabilities

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Derive the KDK as part of PMK to PTK derivation if forced by
configuration or in case both the local station and the AP declare
support for secure LTF.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
This commit is contained in:
Ilan Peer 2020-12-16 13:01:39 +02:00 committed by Jouni Malinen
parent 9e7b980d65
commit dccb6cde03
5 changed files with 43 additions and 14 deletions
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27
src/rsn_supp/wpa.c
View file

@ -579,7 +579,7 @@ static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
const struct wpa_eapol_key *key, struct wpa_ptk *ptk)
{
const u8 *z = NULL;
size_t z_len = 0;
size_t z_len = 0, kdk_len;
int akmp;
#ifdef CONFIG_IEEE80211R
@ -603,11 +603,19 @@ static int wpa_derive_ptk(struct wpa_sm *sm, const unsigned char *src_addr,
akmp |= WPA_KEY_MGMT_PSK_SHA256;
}
#endif /* CONFIG_OWE */
if (sm->force_kdk_derivation ||
(sm->secure_ltf && sm->ap_rsnxe && sm->ap_rsnxe_len >= 4 &&
sm->ap_rsnxe[3] & BIT(WLAN_RSNX_CAPAB_SECURE_LTF - 8)))
kdk_len = WPA_KDK_MAX_LEN;
else
kdk_len = 0;
return wpa_pmk_to_ptk(sm->pmk, sm->pmk_len, "Pairwise key expansion",
sm->own_addr, sm->bssid, sm->snonce,
key->key_nonce, ptk, akmp,
sm->pairwise_cipher, z, z_len,
sm->kdk ? WPA_KDK_MAX_LEN : 0);
kdk_len);
}
@ -3188,7 +3196,7 @@ void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
sm->p2p = config->p2p;
sm->wpa_rsc_relaxation = config->wpa_rsc_relaxation;
sm->owe_ptk_workaround = config->owe_ptk_workaround;
sm->kdk = config->kdk;
sm->force_kdk_derivation = config->force_kdk_derivation;
#ifdef CONFIG_FILS
if (config->fils_cache_id) {
sm->fils_cache_id_set = 1;
@ -3211,7 +3219,7 @@ void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
sm->wpa_rsc_relaxation = 0;
sm->owe_ptk_workaround = 0;
sm->beacon_prot = 0;
sm->kdk = false;
sm->force_kdk_derivation = false;
}
}
@ -4134,7 +4142,7 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
const u8 *g_sta = NULL;
size_t g_sta_len = 0;
const u8 *g_ap = NULL;
size_t g_ap_len = 0;
size_t g_ap_len = 0, kdk_len;
struct wpabuf *pub = NULL;
os_memcpy(sm->bssid, bssid, ETH_ALEN);
@ -4362,6 +4370,13 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
goto fail;
}
if (sm->force_kdk_derivation ||
(sm->secure_ltf && sm->ap_rsnxe && sm->ap_rsnxe_len >= 4 &&
sm->ap_rsnxe[3] & BIT(WLAN_RSNX_CAPAB_SECURE_LTF - 8)))
kdk_len = WPA_KDK_MAX_LEN;
else
kdk_len = 0;
if (fils_pmk_to_ptk(sm->pmk, sm->pmk_len, sm->own_addr, sm->bssid,
sm->fils_nonce, sm->fils_anonce,
dh_ss ? wpabuf_head(dh_ss) : NULL,
@ -4369,7 +4384,7 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
&sm->ptk, ick, &ick_len,
sm->key_mgmt, sm->pairwise_cipher,
sm->fils_ft, &sm->fils_ft_len,
sm->kdk ? WPA_KDK_MAX_LEN : 0) < 0) {
kdk_len) < 0) {
wpa_printf(MSG_DEBUG, "FILS: Failed to derive PTK");
goto fail;
}

2
src/rsn_supp/wpa.h
View file

@ -132,7 +132,7 @@ struct rsn_supp_config {
int owe_ptk_workaround;
const u8 *fils_cache_id;
int beacon_prot;
bool kdk;
bool force_kdk_derivation;
};
#ifndef CONFIG_NO_WPA

22
src/rsn_supp/wpa_ft.c
View file

@ -40,7 +40,7 @@ int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
const u8 *anonce = key->key_nonce;
int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
const u8 *mpmk;
size_t mpmk_len;
size_t mpmk_len, kdk_len;
if (sm->xxkey_len > 0) {
mpmk = sm->xxkey;
@ -68,10 +68,17 @@ int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
wpa_ft_pasn_store_r1kh(sm, src_addr);
if (sm->force_kdk_derivation ||
(sm->secure_ltf && sm->ap_rsnxe && sm->ap_rsnxe_len >= 4 &&
sm->ap_rsnxe[3] & BIT(WLAN_RSNX_CAPAB_SECURE_LTF - 8)))
kdk_len = WPA_KDK_MAX_LEN;
else
kdk_len = 0;
return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce, anonce,
sm->own_addr, sm->bssid, sm->pmk_r1_name, ptk,
ptk_name, sm->key_mgmt, sm->pairwise_cipher,
sm->kdk ? WPA_KDK_MAX_LEN : 0);
kdk_len);
}
@ -539,7 +546,7 @@ int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
int ret;
const u8 *bssid;
const u8 *kck;
size_t kck_len;
size_t kck_len, kdk_len;
int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
const u8 *anonce, *snonce;
@ -664,11 +671,18 @@ int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len,
wpa_ft_pasn_store_r1kh(sm, bssid);
if (sm->force_kdk_derivation ||
(sm->secure_ltf && sm->ap_rsnxe && sm->ap_rsnxe_len >= 4 &&
sm->ap_rsnxe[3] & BIT(WLAN_RSNX_CAPAB_SECURE_LTF - 8)))
kdk_len = WPA_KDK_MAX_LEN;
else
kdk_len = 0;
if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->pmk_r1_len, sm->snonce,
anonce, sm->own_addr, bssid,
sm->pmk_r1_name, &sm->ptk, ptk_name, sm->key_mgmt,
sm->pairwise_cipher,
sm->kdk ? WPA_KDK_MAX_LEN : 0) < 0)
kdk_len) < 0)
return -1;
if (wpa_key_mgmt_fils(sm->key_mgmt)) {

4
src/rsn_supp/wpa_i.h
View file

@ -80,9 +80,9 @@ struct wpa_sm {
/*
* If set Key Derivation Key should be derived as part of PMK to
* PTK derivation.
* PTK derivation regardless of advertised capabilities.
*/
bool kdk;
bool force_kdk_derivation;
u8 own_addr[ETH_ALEN];
const char *ifname;

2
wpa_supplicant/wpas_glue.c
View file

@ -1477,7 +1477,7 @@ void wpa_supplicant_rsn_supp_set_config(struct wpa_supplicant *wpa_s,
}
#ifdef CONFIG_PASN
#ifdef CONFIG_TESTING_OPTIONS
conf.kdk = wpa_s->conf->force_kdk_derivation;
conf.force_kdk_derivation = wpa_s->conf->force_kdk_derivation;
#endif /* CONFIG_TESTING_OPTIONS */
#endif /* CONFIG_PASN*/
wpa_sm_set_config(wpa_s->wpa, ssid ? &conf : NULL);