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SAE: H2E version of SAE commit message handling for STA

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Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2019-09-06 15:40:39 +03:00 committed by Jouni Malinen
parent 447cd5f2df
commit cfe1ea5c9c
2 changed files with 64 additions and 10 deletions
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13
wpa_supplicant/events.c
View file

@ -1262,6 +1262,19 @@ struct wpa_ssid * wpa_scan_res_match(struct wpa_supplicant *wpa_s,
continue;
}
#ifdef CONFIG_SAE
if (wpa_s->conf->sae_pwe == 1 &&
wpa_key_mgmt_sae(ssid->key_mgmt) &&
(!(ie = wpa_bss_get_ie(bss, WLAN_EID_RSNX)) ||
ie[1] < 1 ||
!(ie[2] & BIT(WLAN_RSNX_CAPAB_SAE_H2E)))) {
if (debug_print)
wpa_dbg(wpa_s, MSG_DEBUG,
" skip - SAE H2E required, but not supported by the AP");
continue;
}
#endif /* CONFIG_SAE */
#ifndef CONFIG_IBSS_RSN
if (ssid->mode == WPAS_MODE_IBSS &&
!(ssid->key_mgmt & (WPA_KEY_MGMT_NONE |

61
wpa_supplicant/sme.c
View file

@ -84,11 +84,16 @@ static int sme_set_sae_group(struct wpa_supplicant *wpa_s)
static struct wpabuf * sme_auth_build_sae_commit(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid,
const u8 *bssid, int external,
int reuse)
int reuse, int *ret_use_pt)
{
struct wpabuf *buf;
size_t len;
const char *password;
struct wpa_bss *bss;
int use_pt = 0;
if (ret_use_pt)
*ret_use_pt = 0;
#ifdef CONFIG_TESTING_OPTIONS
if (wpa_s->sae_commit_override) {
@ -117,6 +122,7 @@ static struct wpabuf * sme_auth_build_sae_commit(struct wpa_supplicant *wpa_s,
os_memcmp(bssid, wpa_s->sme.sae.tmp->bssid, ETH_ALEN) == 0) {
wpa_printf(MSG_DEBUG,
"SAE: Reuse previously generated PWE on a retry with the same AP");
use_pt = wpa_s->sme.sae.tmp->h2e;
goto reuse_data;
}
if (sme_set_sae_group(wpa_s) < 0) {
@ -124,7 +130,31 @@ static struct wpabuf * sme_auth_build_sae_commit(struct wpa_supplicant *wpa_s,
return NULL;
}
if (sae_prepare_commit(wpa_s->own_addr, bssid,
if (wpa_s->conf->sae_pwe == 1 || wpa_s->conf->sae_pwe == 2) {
bss = wpa_bss_get_bssid_latest(wpa_s, bssid);
if (bss) {
const u8 *rsnxe;
rsnxe = wpa_bss_get_ie(bss, WLAN_EID_RSNX);
if (rsnxe && rsnxe[1] >= 1)
use_pt = !!(rsnxe[2] &
BIT(WLAN_RSNX_CAPAB_SAE_H2E));
}
if (wpa_s->conf->sae_pwe == 1 && !use_pt) {
wpa_printf(MSG_DEBUG,
"SAE: Cannot use H2E with the selected AP");
return NULL;
}
}
if (use_pt &&
sae_prepare_commit_pt(&wpa_s->sme.sae, ssid->pt,
wpa_s->own_addr, bssid,
wpa_s->sme.sae_rejected_groups) < 0)
return NULL;
if (!use_pt &&
sae_prepare_commit(wpa_s->own_addr, bssid,
(u8 *) password, os_strlen(password),
ssid->sae_password_id,
&wpa_s->sme.sae) < 0) {
@ -143,10 +173,13 @@ reuse_data:
return NULL;
if (!external) {
wpabuf_put_le16(buf, 1); /* Transaction seq# */
wpabuf_put_le16(buf, WLAN_STATUS_SUCCESS);
wpabuf_put_le16(buf, use_pt ? WLAN_STATUS_SAE_HASH_TO_ELEMENT :
WLAN_STATUS_SUCCESS);
}
sae_write_commit(&wpa_s->sme.sae, buf, wpa_s->sme.sae_token,
ssid->sae_password_id);
if (ret_use_pt)
*ret_use_pt = use_pt;
return buf;
}
@ -651,7 +684,7 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
if (start)
resp = sme_auth_build_sae_commit(wpa_s, ssid,
bss->bssid, 0,
start == 2);
start == 2, NULL);
else
resp = sme_auth_build_sae_confirm(wpa_s, 0);
if (resp == NULL) {
@ -905,7 +938,8 @@ void sme_authenticate(struct wpa_supplicant *wpa_s,
static int sme_external_auth_build_buf(struct wpabuf *buf,
struct wpabuf *params,
const u8 *sa, const u8 *da,
u16 auth_transaction, u16 seq_num)
u16 auth_transaction, u16 seq_num,
u16 status_code)
{
struct ieee80211_mgmt *resp;
@ -920,7 +954,7 @@ static int sme_external_auth_build_buf(struct wpabuf *buf,
resp->u.auth.auth_alg = host_to_le16(WLAN_AUTH_SAE);
resp->seq_ctrl = host_to_le16(seq_num << 4);
resp->u.auth.auth_transaction = host_to_le16(auth_transaction);
resp->u.auth.status_code = host_to_le16(WLAN_STATUS_SUCCESS);
resp->u.auth.status_code = host_to_le16(status_code);
if (params)
wpabuf_put_buf(buf, params);
@ -933,8 +967,9 @@ static int sme_external_auth_send_sae_commit(struct wpa_supplicant *wpa_s,
struct wpa_ssid *ssid)
{
struct wpabuf *resp, *buf;
int use_pt;
resp = sme_auth_build_sae_commit(wpa_s, ssid, bssid, 1, 0);
resp = sme_auth_build_sae_commit(wpa_s, ssid, bssid, 1, 0, &use_pt);
if (!resp) {
wpa_printf(MSG_DEBUG, "SAE: Failed to build SAE commit");
return -1;
@ -949,7 +984,9 @@ static int sme_external_auth_send_sae_commit(struct wpa_supplicant *wpa_s,
wpa_s->sme.seq_num++;
sme_external_auth_build_buf(buf, resp, wpa_s->own_addr,
bssid, 1, wpa_s->sme.seq_num);
bssid, 1, wpa_s->sme.seq_num,
use_pt ? WLAN_STATUS_SAE_HASH_TO_ELEMENT :
WLAN_STATUS_SUCCESS);
wpa_drv_send_mlme(wpa_s, wpabuf_head(buf), wpabuf_len(buf), 1, 0);
wpabuf_free(resp);
wpabuf_free(buf);
@ -1018,7 +1055,8 @@ static void sme_external_auth_send_sae_confirm(struct wpa_supplicant *wpa_s,
}
wpa_s->sme.seq_num++;
sme_external_auth_build_buf(buf, resp, wpa_s->own_addr,
da, 2, wpa_s->sme.seq_num);
da, 2, wpa_s->sme.seq_num,
WLAN_STATUS_SUCCESS);
wpa_drv_send_mlme(wpa_s, wpabuf_head(buf), wpabuf_len(buf), 1, 0);
wpabuf_free(resp);
wpabuf_free(buf);
@ -1135,7 +1173,8 @@ static int sme_sae_auth(struct wpa_supplicant *wpa_s, u16 auth_transaction,
return -1;
}
if (status_code != WLAN_STATUS_SUCCESS)
if (status_code != WLAN_STATUS_SUCCESS &&
status_code != WLAN_STATUS_SAE_HASH_TO_ELEMENT)
return -1;
if (auth_transaction == 1) {
@ -1177,6 +1216,8 @@ static int sme_sae_auth(struct wpa_supplicant *wpa_s, u16 auth_transaction,
sme_external_auth_send_sae_confirm(wpa_s, sa);
return 0;
} else if (auth_transaction == 2) {
if (status_code != WLAN_STATUS_SUCCESS)
return -1;
wpa_dbg(wpa_s, MSG_DEBUG, "SME SAE confirm");
if (wpa_s->sme.sae.state != SAE_CONFIRMED)
return -1;