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SAE: Use H2E whenever Password Identifier is used

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IEEE P802.11-REVmd was modified to require H2E to be used whenever
Password Identifier is used with SAE.

See this document for more details of the approved changes:
https://mentor.ieee.org/802.11/dcn/19/11-19-2154-02-000m-sae-anti-clogging-token.docx

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-01-20 21:15:04 +02:00 committed by Jouni Malinen
parent 6a673d0fb0
commit e36a5894d0
9 changed files with 60 additions and 25 deletions
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6
hostapd/hostapd.conf
View file

@ -1784,11 +1784,13 @@ own_ip_addr=127.0.0.1
#sae_confirm_immediate=0
# SAE mechanism for PWE derivation
# 0 = hunting-and-pecking loop only (default)
# 1 = hash-to-element only
# 0 = hunting-and-pecking loop only (default without password identifier)
# 1 = hash-to-element only (default with password identifier)
# 2 = both hunting-and-pecking loop and hash-to-element enabled
# Note: The default value is likely to change from 0 to 2 once the new
# hash-to-element mechanism has received more interoperability testing.
# When using SAE password identifier, the hash-to-element mechanism is used
# regardless of the sae_pwe parameter value.
#sae_pwe=0
# FILS Cache Identifier (16-bit value in hexdump format)

3
src/ap/ap_config.c
View file

@ -441,7 +441,8 @@ int hostapd_setup_sae_pt(struct hostapd_bss_config *conf)
struct hostapd_ssid *ssid = &conf->ssid;
struct sae_password_entry *pw;
if (conf->sae_pwe == 0 || !wpa_key_mgmt_sae(conf->wpa_key_mgmt))
if ((conf->sae_pwe == 0 && !hostapd_sae_pw_id_in_use(conf)) ||
!wpa_key_mgmt_sae(conf->wpa_key_mgmt))
return 0; /* PT not needed */
sae_deinit_pt(ssid->pt);

40
src/ap/ieee802_11.c
View file

@ -88,6 +88,7 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
int i, num, count;
int h2e_required;
if (hapd->iface->current_rates == NULL)
return eid;
@ -98,8 +99,10 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid)
num++;
if (hapd->iconf->ieee80211ac && hapd->iconf->require_vht)
num++;
if (hapd->conf->sae_pwe == 1 &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt))
h2e_required = (hapd->conf->sae_pwe == 1 ||
hostapd_sae_pw_id_in_use(hapd->conf) == 2) &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt);
if (h2e_required)
num++;
if (num > 8) {
/* rest of the rates are encoded in Extended supported
@ -127,9 +130,7 @@ u8 * hostapd_eid_supp_rates(struct hostapd_data *hapd, u8 *eid)
*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY;
}
if (hapd->conf->sae_pwe == 1 &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt) &&
count < 8) {
if (h2e_required && count < 8) {
count++;
*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_SAE_H2E_ONLY;
}
@ -142,6 +143,7 @@ u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid)
{
u8 *pos = eid;
int i, num, count;
int h2e_required;
if (hapd->iface->current_rates == NULL)
return eid;
@ -151,8 +153,10 @@ u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid)
num++;
if (hapd->iconf->ieee80211ac && hapd->iconf->require_vht)
num++;
if (hapd->conf->sae_pwe == 1 &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt))
h2e_required = (hapd->conf->sae_pwe == 1 ||
hostapd_sae_pw_id_in_use(hapd->conf) == 2) &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt);
if (h2e_required)
num++;
if (num <= 8)
return eid;
@ -183,8 +187,7 @@ u8 * hostapd_eid_ext_supp_rates(struct hostapd_data *hapd, u8 *eid)
*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY;
}
if (hapd->conf->sae_pwe == 1 &&
wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt)) {
if (h2e_required) {
count++;
if (count > 8)
*pos++ = 0x80 | BSS_MEMBERSHIP_SELECTOR_SAE_H2E_ONLY;
@ -453,7 +456,9 @@ static struct wpabuf * auth_build_sae_commit(struct hostapd_data *hapd,
use_pt = sta->sae->tmp->h2e;
}
if (status_code == WLAN_STATUS_SUCCESS)
if (rx_id)
use_pt = 1;
else if (status_code == WLAN_STATUS_SUCCESS)
use_pt = 0;
else if (status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT)
use_pt = 1;
@ -1060,11 +1065,20 @@ static void sae_pick_next_group(struct hostapd_data *hapd, struct sta_info *sta)
static int sae_status_success(struct hostapd_data *hapd, u16 status_code)
{
return (hapd->conf->sae_pwe == 0 &&
int sae_pwe = hapd->conf->sae_pwe;
int id_in_use;
id_in_use = hostapd_sae_pw_id_in_use(hapd->conf);
if (id_in_use == 2)
sae_pwe = 1;
else if (id_in_use == 1 && sae_pwe == 0)
sae_pwe = 2;
return (sae_pwe == 0 &&
status_code == WLAN_STATUS_SUCCESS) ||
(hapd->conf->sae_pwe == 1 &&
(sae_pwe == 1 &&
status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT) ||
(hapd->conf->sae_pwe == 2 &&
(sae_pwe == 2 &&
(status_code == WLAN_STATUS_SUCCESS ||
status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT));
}

3
src/ap/ieee802_11_shared.c
View file

@ -1014,7 +1014,8 @@ u8 * hostapd_eid_rsnxe(struct hostapd_data *hapd, u8 *eid, size_t len)
if (!(hapd->conf->wpa & WPA_PROTO_RSN) ||
!wpa_key_mgmt_sae(hapd->conf->wpa_key_mgmt) ||
(hapd->conf->sae_pwe != 1 && hapd->conf->sae_pwe != 2) ||
(hapd->conf->sae_pwe != 1 && hapd->conf->sae_pwe != 2 &&
!hostapd_sae_pw_id_in_use(hapd->conf)) ||
len < 3)
return pos;

7
src/ap/wpa_auth_glue.c
View file

@ -37,6 +37,8 @@ static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
struct hostapd_config *iconf,
struct wpa_auth_config *wconf)
{
int sae_pw_id;
os_memset(wconf, 0, sizeof(*wconf));
wconf->wpa = conf->wpa;
wconf->wpa_key_mgmt = conf->wpa_key_mgmt;
@ -155,6 +157,11 @@ static void hostapd_wpa_auth_conf(struct hostapd_bss_config *conf,
FILS_CACHE_ID_LEN);
#endif /* CONFIG_FILS */
wconf->sae_pwe = conf->sae_pwe;
sae_pw_id = hostapd_sae_pw_id_in_use(conf);
if (sae_pw_id == 2)
wconf->sae_pwe = 1;
else if (sae_pw_id == 1 && wconf->sae_pwe == 0)
wconf->sae_pwe = 2;
}

3
wpa_supplicant/events.c
View file

@ -854,6 +854,7 @@ static int rate_match(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,
if (flagged && ((rate_ie[j] & 0x7f) ==
BSS_MEMBERSHIP_SELECTOR_SAE_H2E_ONLY)) {
if (wpa_s->conf->sae_pwe == 0 &&
!ssid->sae_password_id &&
wpa_key_mgmt_sae(ssid->key_mgmt)) {
if (debug_print)
wpa_dbg(wpa_s, MSG_DEBUG,
@ -1299,7 +1300,7 @@ struct wpa_ssid * wpa_scan_res_match(struct wpa_supplicant *wpa_s,
}
#ifdef CONFIG_SAE
if (wpa_s->conf->sae_pwe == 1 &&
if ((wpa_s->conf->sae_pwe == 1 || ssid->sae_password_id) &&
wpa_key_mgmt_sae(ssid->key_mgmt) &&
(!(ie = wpa_bss_get_ie(bss, WLAN_EID_RSNX)) ||
ie[1] < 1 ||

8
wpa_supplicant/sme.c
View file

@ -131,7 +131,10 @@ static struct wpabuf * sme_auth_build_sae_commit(struct wpa_supplicant *wpa_s,
return NULL;
}
if (wpa_s->conf->sae_pwe == 1 || wpa_s->conf->sae_pwe == 2) {
if (ssid->sae_password_id)
use_pt = 1;
if (use_pt || 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;
@ -142,7 +145,8 @@ static struct wpabuf * sme_auth_build_sae_commit(struct wpa_supplicant *wpa_s,
BIT(WLAN_RSNX_CAPAB_SAE_H2E));
}
if (wpa_s->conf->sae_pwe == 1 && !use_pt) {
if ((wpa_s->conf->sae_pwe == 1 || ssid->sae_password_id) &&
!use_pt) {
wpa_printf(MSG_DEBUG,
"SAE: Cannot use H2E with the selected AP");
return NULL;

9
wpa_supplicant/wpa_supplicant.c
View file

@ -1272,7 +1272,7 @@ int wpa_supplicant_set_suites(struct wpa_supplicant *wpa_s,
u8 *wpa_ie, size_t *wpa_ie_len)
{
struct wpa_ie_data ie;
int sel, proto;
int sel, proto, sae_pwe;
const u8 *bss_wpa, *bss_rsn, *bss_rsnx, *bss_osen;
if (bss) {
@ -1617,7 +1617,10 @@ int wpa_supplicant_set_suites(struct wpa_supplicant *wpa_s,
#ifdef CONFIG_OCV
wpa_sm_set_param(wpa_s->wpa, WPA_PARAM_OCV, ssid->ocv);
#endif /* CONFIG_OCV */
wpa_sm_set_param(wpa_s->wpa, WPA_PARAM_SAE_PWE, wpa_s->conf->sae_pwe);
sae_pwe = wpa_s->conf->sae_pwe;
if (ssid->sae_password_id)
sae_pwe = 1;
wpa_sm_set_param(wpa_s->wpa, WPA_PARAM_SAE_PWE, sae_pwe);
if (wpa_sm_set_assoc_wpa_ie_default(wpa_s->wpa, wpa_ie, wpa_ie_len)) {
wpa_msg(wpa_s, MSG_WARNING, "WPA: Failed to generate WPA IE");
@ -1993,7 +1996,7 @@ static void wpa_s_setup_sae_pt(struct wpa_config *conf, struct wpa_ssid *ssid)
if (!password)
password = ssid->passphrase;
if (conf->sae_pwe == 0 || !password) {
if ((conf->sae_pwe == 0 && !ssid->sae_password_id) || !password) {
/* PT derivation not needed */
sae_deinit_pt(ssid->pt);
ssid->pt = NULL;

6
wpa_supplicant/wpa_supplicant.conf
View file

@ -426,11 +426,13 @@ fast_reauth=1
#sae_groups=19 20 21
# SAE mechanism for PWE derivation
# 0 = hunting-and-pecking loop only (default)
# 1 = hash-to-element only
# 0 = hunting-and-pecking loop only (default without password identifier)
# 1 = hash-to-element only (default with password identifier)
# 2 = both hunting-and-pecking loop and hash-to-element enabled
# Note: The default value is likely to change from 0 to 2 once the new
# hash-to-element mechanism has received more interoperability testing.
# When using SAE password identifier, the hash-to-element mechanism is used
# regardless of the sae_pwe parameter value.
#sae_pwe=0
# Default value for DTIM period (if not overridden in network block)