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FILS: Fix Key-Auth derivation for SK+PFS for supplicant side

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The conditional gSTA and gAP (DH public keys) were not previously
included in Key-Auth derivation, but they are needed for the PFS case.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2017-05-07 17:02:47 +03:00
parent 4d0a61c501
commit e6b6231338
1 changed files with 30 additions and 1 deletions
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31
src/rsn_supp/wpa.c
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@ -3422,6 +3422,11 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
size_t ick_len;
int res;
struct wpabuf *dh_ss = NULL;
const u8 *g_sta = NULL;
size_t g_sta_len = 0;
const u8 *g_ap = NULL;
size_t g_ap_len = 0;
struct wpabuf *pub = NULL;
os_memcpy(sm->bssid, bssid, ETH_ALEN);
@ -3469,6 +3474,8 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
goto fail;
}
wpa_hexdump_buf_key(MSG_DEBUG, "FILS: DH_SS", dh_ss);
g_ap = pos;
g_ap_len = sm->fils_dh_elem_len;
pos += sm->fils_dh_elem_len;
}
#endif /* CONFIG_FILS_SK_PFS */
@ -3605,15 +3612,37 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
sm->tptk_set = 0;
os_memset(&sm->tptk, 0, sizeof(sm->tptk));
#ifdef CONFIG_FILS_SK_PFS
if (sm->fils_dh_group) {
if (!sm->fils_ecdh) {
wpa_printf(MSG_INFO, "FILS: ECDH not initialized");
goto fail;
}
pub = crypto_ecdh_get_pubkey(sm->fils_ecdh, 1);
if (!pub)
goto fail;
wpa_hexdump_buf(MSG_DEBUG, "FILS: gSTA", pub);
g_sta = wpabuf_head(pub);
g_sta_len = wpabuf_len(pub);
if (!g_ap) {
wpa_printf(MSG_INFO, "FILS: gAP not available");
goto fail;
}
wpa_hexdump(MSG_DEBUG, "FILS: gAP", g_ap, g_ap_len);
}
#endif /* CONFIG_FILS_SK_PFS */
res = fils_key_auth_sk(ick, ick_len, sm->fils_nonce,
sm->fils_anonce, sm->own_addr, sm->bssid,
NULL, 0, NULL, 0, /* TODO: PK */
g_sta, g_sta_len, g_ap, g_ap_len,
sm->key_mgmt, sm->fils_key_auth_sta,
sm->fils_key_auth_ap,
&sm->fils_key_auth_len);
wpabuf_free(pub);
os_memset(ick, 0, sizeof(ick));
return res;
fail:
wpabuf_free(pub);
wpabuf_clear_free(dh_ss);
return -1;
}