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MLD STA: Group key handshake processing for GTK/IGTK/BIGTK rekeying

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Add support for group rekeying in MLO connection. Parse per link MLO
GTK/IGTK/BIGTK KDEs from Group Key msg 1/2 and configure to the driver.

Signed-off-by: Rohan Dutta <quic_drohan@quicinc.com>
Signed-off-by: Veerendranath Jakkam <quic_vjakkam@quicinc.com>
This commit is contained in:
Rohan Dutta 2022-11-03 13:38:53 +05:30 committed by Jouni Malinen
parent f0760aa6dd
commit 2f61d703a1
1 changed files with 110 additions and 3 deletions
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109
src/rsn_supp/wpa.c
View file

@ -2788,6 +2788,106 @@ static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
}
static void wpa_supplicant_process_mlo_1_of_2(struct wpa_sm *sm,
const unsigned char *src_addr,
const struct wpa_eapol_key *key,
const u8 *key_data,
size_t key_data_len, u16 ver)
{
u16 key_info;
u8 i;
struct wpa_eapol_ie_parse ie;
if (!sm->msg_3_of_4_ok && !wpa_fils_is_completed(sm)) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"MLO RSN: Group Key Handshake started prior to completion of 4-way handshake");
goto failed;
}
wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "MLO RSN: RX message 1 of Group "
"Key Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr),
ver);
key_info = WPA_GET_BE16(key->key_info);
wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
wpa_hexdump_key(MSG_DEBUG, "MLO RSN: msg 1/2 key data", key_data,
key_data_len);
if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
goto failed;
if (!ie.valid_mlo_gtks) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"MLO RSN: No MLO GTK KDE in Group Key msg 1/2");
goto failed;
}
if (!(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"MLO RSN: MLO GTK KDE in unencrypted key data");
goto failed;
}
#ifdef CONFIG_OCV
if (wpa_sm_ocv_enabled(sm)) {
struct wpa_channel_info ci;
if (wpa_sm_channel_info(sm, &ci) != 0) {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
"Failed to get channel info to validate received OCI in EAPOL-Key group msg 1/2");
goto failed;
}
if (ocv_verify_tx_params(ie.oci, ie.oci_len, &ci,
channel_width_to_int(ci.chanwidth),
ci.seg1_idx) != OCI_SUCCESS) {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
"addr=" MACSTR " frame=eapol-key-g1 error=%s",
MAC2STR(sm->bssid), ocv_errorstr);
goto failed;
}
}
#endif /* CONFIG_OCV */
if (mlo_ieee80211w_set_keys(sm, &ie) < 0)
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"MLO RSN: Failed to configure MLO IGTK");
for (i = 0; i < MAX_NUM_MLO_LINKS; i++) {
if (!(sm->mlo.valid_links & BIT(i)))
continue;
/*
* AP may send group keys for subset of the all links during
* rekey
*/
if (!ie.mlo_gtk[i])
continue;
if (wpa_supplicant_mlo_gtk(sm, i, ie.mlo_gtk[i],
ie.mlo_gtk_len[i], key_info))
goto failed;
}
if (wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0)
goto failed;
wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "MLO RSN: Group rekeying completed "
"with " MACSTR " [GTK=%s]", MAC2STR(sm->mlo.ap_mld_addr),
wpa_cipher_txt(sm->group_cipher));
wpa_sm_cancel_auth_timeout(sm);
wpa_sm_set_state(sm, WPA_COMPLETED);
wpa_sm_set_rekey_offload(sm);
return;
failed:
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
}
static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
const unsigned char *src_addr,
const struct wpa_eapol_key *key,
@ -3420,8 +3520,15 @@ int wpa_sm_rx_eapol(struct wpa_sm *sm, const u8 *src_addr,
if ((mic_len && (key_info & WPA_KEY_INFO_MIC)) ||
(!mic_len && (key_info & WPA_KEY_INFO_ENCR_KEY_DATA))) {
/* 1/2 Group Key Handshake */
if (sm->mlo.valid_links)
wpa_supplicant_process_mlo_1_of_2(sm, src_addr,
key, key_data,
key_data_len,
ver);
else
wpa_supplicant_process_1_of_2(sm, src_addr, key,
key_data, key_data_len,
key_data,
key_data_len,
ver);
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,