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/*
* hostapd / IEEE 802.11 Management
* Copyright (c) 2002-2017, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "utils/includes.h"
#include "common/sae.h"
#include "common/ieee802_11_defs.h"
#include "esp_wifi_driver.h"
#include "ap/wpa_auth.h"
#include "ap/hostapd.h"
#include "ap/sta_info.h"
#include "crypto/sha256.h"
#include "ap/pmksa_cache_auth.h"
#include "ap/comeback_token.h"
#include "crypto/random.h"
#include "esp_wpa3_i.h"
#include "esp_hostap.h"
#ifdef CONFIG_SAE
static void sae_set_state(struct sta_info *sta, enum sae_state state,
const char *reason)
{
wpa_printf(MSG_DEBUG, "SAE: State %s -> %s for peer " MACSTR " (%s)",
sae_state_txt(sta->sae->state), sae_state_txt(state),
MAC2STR(sta->addr), reason);
sta->sae->state = state;
}
static const char * sae_get_password(struct hostapd_data *hapd,
struct sta_info *sta,
const char *rx_id,
struct sae_pt **s_pt)
{
const char *password = NULL;
struct sae_pt *pt = NULL;
if (!password) {
password = hapd->conf->ssid.wpa_passphrase;
pt = hapd->conf->ssid.pt;
}
if (s_pt) {
*s_pt = pt;
}
return password;
}
static struct wpabuf *auth_build_sae_commit(struct hostapd_data *hapd,
struct sta_info *sta, int update, int status_code)
{
struct wpabuf *buf;
const char *password = NULL;
const char *rx_id = NULL;
int use_pt = 0;
struct sae_pt *pt = NULL;
if (sta->sae->tmp) {
rx_id = sta->sae->tmp->pw_id;
use_pt = sta->sae->h2e;
}
if (rx_id && hapd->conf->sae_pwe != SAE_PWE_FORCE_HUNT_AND_PECK)
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;
password = sae_get_password(hapd, sta, rx_id, &pt);
if (!password || (use_pt && !pt)) {
wpa_printf(MSG_DEBUG, "SAE: No password available");
return NULL;
}
if (update && use_pt &&
sae_prepare_commit_pt(sta->sae, pt, hapd->own_addr, sta->addr,
NULL, NULL) < 0) {
return NULL;
}
if (update && !use_pt &&
sae_prepare_commit(hapd->own_addr, sta->addr,
(u8 *) password, os_strlen((const char *)password),
sta->sae) < 0) {
wpa_printf(MSG_DEBUG, "SAE: Could not pick PWE");
return NULL;
}
buf = wpabuf_alloc(SAE_COMMIT_MAX_LEN +
(rx_id ? 3 + os_strlen(rx_id) : 0));
if (buf &&
sae_write_commit(sta->sae, buf, sta->sae->tmp ?
sta->sae->tmp->anti_clogging_token : NULL,
rx_id) < 0) {
wpabuf_free(buf);
buf = NULL;
}
return buf;
}
static struct wpabuf *auth_build_sae_confirm(struct hostapd_data *hapd,
struct sta_info *sta)
{
struct wpabuf *buf;
buf = wpabuf_alloc(SAE_CONFIRM_MAX_LEN);
if (buf == NULL) {
return NULL;
}
if (sae_write_confirm(sta->sae, buf) < 0) {
wpabuf_free(buf);
return NULL;
}
return buf;
}
static int auth_sae_send_commit(struct hostapd_data *hapd,
struct sta_info *sta,
const u8 *bssid, int update, int status_code)
{
struct wpabuf *data;
int reply_res;
u16 status;
data = auth_build_sae_commit(hapd, sta, update, status_code);
if (!data && sta->sae->tmp && sta->sae->tmp->pw_id) {
return WLAN_STATUS_UNKNOWN_PASSWORD_IDENTIFIER;
}
if (data == NULL) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
if (sta->sae->tmp && sta->sae->h2e) {
status = WLAN_STATUS_SAE_HASH_TO_ELEMENT;
} else {
status = WLAN_STATUS_SUCCESS;
}
#ifdef ESP_SUPPLICANT
if (sta->remove_pending) {
reply_res = -1;
} else {
reply_res = esp_send_sae_auth_reply(hapd, sta->addr, bssid, WLAN_AUTH_SAE, 1,
status, wpabuf_head(data),
wpabuf_len(data));
}
#endif /* ESP_SUPPLICANT */
wpabuf_free(data);
return reply_res;
}
static int auth_sae_send_confirm(struct hostapd_data *hapd,
struct sta_info *sta,
const u8 *bssid)
{
struct wpabuf *data;
int reply_res;
data = auth_build_sae_confirm(hapd, sta);
if (data == NULL) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
#ifdef ESP_SUPPLICANT
if (sta->remove_pending) {
reply_res = -1;
wpabuf_free(data);
} else {
if (sta->sae_data)
wpabuf_free(sta->sae_data);
sta->sae_data = data;
reply_res = 0;
/* confirm is sent in later stage when all the required processing for a sta is done*/
}
#else
wpabuf_free(data);
#endif /* ESP_SUPPLICANT */
return reply_res;
}
static int use_sae_anti_clogging(struct hostapd_data *hapd)
{
struct sta_info *sta;
unsigned int open = 0;
if (hapd->conf->sae_anti_clogging_threshold == 0) {
return 1;
}
for (sta = hapd->sta_list; sta; sta = sta->next) {
if (sta->sae &&
(sta->sae->state == SAE_COMMITTED ||
sta->sae->state == SAE_CONFIRMED)) {
open++;
}
if (open >= hapd->conf->sae_anti_clogging_threshold) {
return 1;
}
}
/* In addition to already existing open SAE sessions, check whether
* there are enough pending commit messages in the processing queue to
* potentially result in too many open sessions. */
if (open + dl_list_len(&hapd->sae_commit_queue) >=
hapd->conf->sae_anti_clogging_threshold) {
return 1;
}
return 0;
}
static int sae_check_big_sync(struct hostapd_data *hapd, struct sta_info *sta)
{
if (sta->sae->sync > hapd->conf->sae_sync) {
sae_set_state(sta, SAE_NOTHING, "Sync > dot11RSNASAESync");
sta->sae->sync = 0;
return -1;
}
return 0;
}
void sae_accept_sta(struct hostapd_data *hapd, struct sta_info *sta)
{
sta->flags |= WLAN_STA_AUTH;
#ifdef ESP_SUPPLICANT
sta->sae_commit_processing = false;
#endif /* ESP_SUPPLICANT */
sta->auth_alg = WLAN_AUTH_SAE;
sae_set_state(sta, SAE_ACCEPTED, "Accept Confirm");
wpa_auth_pmksa_add_sae(hapd->wpa_auth, sta->addr,
sta->sae->pmk, sta->sae->pmkid, false);
}
static int sae_sm_step(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *bssid, u8 auth_transaction, u16 status_code,
int allow_reuse, int *sta_removed)
{
int ret = WLAN_STATUS_SUCCESS;
*sta_removed = 0;
if (auth_transaction != 1 && auth_transaction != 2) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
wpa_printf(MSG_DEBUG, "SAE: Peer " MACSTR " state=%s auth_trans=%u",
MAC2STR(sta->addr), sae_state_txt(sta->sae->state),
auth_transaction);
switch (sta->sae->state) {
case SAE_NOTHING:
if (auth_transaction == 1) {
if (sta->sae->tmp) {
sta->sae->h2e =
(status_code ==
WLAN_STATUS_SAE_HASH_TO_ELEMENT);
}
ret = auth_sae_send_commit(hapd, sta, bssid,
!allow_reuse, status_code);
if (ret) {
return ret;
}
sae_set_state(sta, SAE_COMMITTED, "Sent Commit");
if (sae_process_commit(sta->sae) < 0) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->sae->sync = 0;
} else {
wpa_printf(MSG_DEBUG, "SAE confirm before commit");
}
break;
case SAE_COMMITTED:
if (auth_transaction == 1) {
if (sae_process_commit(sta->sae) < 0) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
ret = auth_sae_send_confirm(hapd, sta, bssid);
if (ret) {
return ret;
}
sae_set_state(sta, SAE_CONFIRMED, "Sent Confirm");
sta->sae->sync = 0;
} else {
/*
* For instructure BSS, send the postponed Confirm from
* Nothing -> Confirmed transition that was reduced to
* Nothing -> Committed above.
*/
ret = auth_sae_send_confirm(hapd, sta, bssid);
if (ret) {
return ret;
}
sae_set_state(sta, SAE_CONFIRMED, "Sent Confirm");
/*
* Since this was triggered on Confirm RX, run another
* step to get to Accepted without waiting for
* additional events.
*/
return sae_sm_step(hapd, sta, bssid, auth_transaction,
WLAN_STATUS_SUCCESS, 0, sta_removed);
}
break;
case SAE_CONFIRMED:
if (auth_transaction == 1) {
if (sae_check_big_sync(hapd, sta)) {
return WLAN_STATUS_SUCCESS;
}
sta->sae->sync++;
ret = auth_sae_send_commit(hapd, sta, bssid, 1,
status_code);
if (ret) {
return ret;
}
if (sae_process_commit(sta->sae) < 0) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
ret = auth_sae_send_confirm(hapd, sta, bssid);
if (ret) {
return ret;
}
} else {
sta->sae->send_confirm = 0xffff;
sae_accept_sta(hapd, sta);
}
break;
case SAE_ACCEPTED:
if (auth_transaction == 1) {
wpa_printf(MSG_DEBUG, "SAE: Start reauthentication");
ret = auth_sae_send_commit(hapd, sta, bssid, 1,
status_code);
if (ret) {
return ret;
}
sae_set_state(sta, SAE_COMMITTED, "Sent Commit");
if (sae_process_commit(sta->sae) < 0) {
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->sae->sync = 0;
} else {
if (sae_check_big_sync(hapd, sta)) {
return WLAN_STATUS_SUCCESS;
}
sta->sae->sync++;
ret = auth_sae_send_confirm(hapd, sta, bssid);
sae_clear_temp_data(sta->sae);
if (ret) {
return ret;
}
}
break;
default:
wpa_printf(MSG_ERROR, "SAE: invalid state %d",
sta->sae->state);
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
return WLAN_STATUS_SUCCESS;
}
static int sae_status_success(struct hostapd_data *hapd, u16 status_code)
{
enum sae_pwe sae_pwe = hapd->conf->sae_pwe;
return ((sae_pwe == SAE_PWE_HUNT_AND_PECK ||
sae_pwe == SAE_PWE_FORCE_HUNT_AND_PECK) &&
status_code == WLAN_STATUS_SUCCESS) ||
(sae_pwe == SAE_PWE_HASH_TO_ELEMENT &&
(status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT)) ||
(sae_pwe == SAE_PWE_BOTH &&
(status_code == WLAN_STATUS_SUCCESS ||
status_code == WLAN_STATUS_SAE_HASH_TO_ELEMENT));
}
static int sae_is_group_enabled(struct hostapd_data *hapd, int group)
{
int *groups = NULL;
int default_groups[] = { 19, 0 };
int i;
if (!groups) {
groups = default_groups;
}
for (i = 0; groups[i] > 0; i++) {
if (groups[i] == group)
return 1;
}
return 0;
}
static int check_sae_rejected_groups(struct hostapd_data *hapd,
struct sae_data *sae)
{
const struct wpabuf *groups;
size_t i, count, len;
const u8 *pos;
if (!sae->tmp)
return 0;
groups = sae->tmp->peer_rejected_groups;
if (!groups)
return 0;
pos = wpabuf_head(groups);
len = wpabuf_len(groups);
if (len & 1) {
wpa_printf(MSG_DEBUG,
"SAE: Invalid length of the Rejected Groups element payload: %zu",
len);
return 1;
}
count = len / 2;
for (i = 0; i < count; i++) {
int enabled;
u16 group;
group = WPA_GET_LE16(pos);
pos += 2;
enabled = sae_is_group_enabled(hapd, group);
wpa_printf(MSG_DEBUG, "SAE: Rejected group %u is %s",
group, enabled ? "enabled" : "disabled");
if (enabled)
return 1;
}
return 0;
}
int handle_auth_sae(struct hostapd_data *hapd, struct sta_info *sta,
u8 *buf, size_t len, u8 *bssid,
u16 auth_transaction, u16 status)
{
int resp = WLAN_STATUS_SUCCESS;
struct wpabuf *data = NULL;
int *groups = hapd->conf->sae_groups;
int default_group[] = { IANA_SECP256R1, 0};
const u8 *pos, *end;
int sta_removed = 0;
if (!groups) {
groups = default_group;
}
if (!sta->sae) {
if (auth_transaction != 1 ||
!sae_status_success(hapd, status)) {
wpa_printf(MSG_DEBUG, "SAE: Unexpected Status Code %u",
status);
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto reply;
}
sta->sae = os_zalloc(sizeof(*sta->sae));
if (!sta->sae) {
resp = WLAN_STATUS_AP_UNABLE_TO_HANDLE_NEW_STA;
goto remove_sta;
}
sae_set_state(sta, SAE_NOTHING, "Init");
sta->sae->sync = 0;
}
if (auth_transaction == 1) {
const u8 *token = NULL;
size_t token_len = 0;
int allow_reuse = 0;
if (!sae_status_success(hapd, status)) {
goto remove_sta;
}
if (sta->sae->state == SAE_COMMITTED) {
/* This is needed in the infrastructure BSS case to
* address a sequence where a STA entry may remain in
* hostapd across two attempts to do SAE authentication
* by the same STA. The second attempt may end up trying
* to use a different group and that would not be
* allowed if we remain in Committed state with the
* previously set parameters. */
pos = buf;
end = buf + len;
if (end - pos >= (int) sizeof(le16) &&
sae_group_allowed(sta->sae, groups,
WPA_GET_LE16(pos)) ==
WLAN_STATUS_SUCCESS) {
/* Do not waste resources deriving the same PWE
* again since the same group is reused. */
sae_set_state(sta, SAE_NOTHING,
"Allow previous PWE to be reused");
allow_reuse = 1;
} else {
sae_set_state(sta, SAE_NOTHING,
"Clear existing state to allow restart");
sae_clear_data(sta->sae);
}
}
resp = sae_parse_commit(sta->sae, buf, len, &token, &token_len, default_group,
status == WLAN_STATUS_SAE_HASH_TO_ELEMENT);
if (resp == SAE_SILENTLY_DISCARD) {
wpa_printf(MSG_DEBUG,
"SAE: Drop commit message from " MACSTR " due to reflection attack",
MAC2STR(sta->addr));
resp = WLAN_STATUS_SUCCESS;
goto remove_sta;
}
if (resp == WLAN_STATUS_UNKNOWN_PASSWORD_IDENTIFIER) {
sae_set_state(sta, SAE_NOTHING,
"Unknown Password Identifier");
goto remove_sta;
}
if (token &&
check_comeback_token(hapd->comeback_key,
hapd->comeback_pending_idx, sta->addr,
token, token_len) < 0) {
wpa_printf(MSG_DEBUG, "SAE: Drop commit message with "
"incorrect token from " MACSTR,
MAC2STR(sta->addr));
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto remove_sta;
}
if (check_sae_rejected_groups(hapd, sta->sae)) {
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto reply;
}
if (resp != WLAN_STATUS_SUCCESS) {
goto reply;
}
if (!token && use_sae_anti_clogging(hapd) && !allow_reuse) {
int h2e = 0;
wpa_printf(MSG_DEBUG,
"SAE: Request anti-clogging token from "
MACSTR, MAC2STR(sta->addr));
if (sta->sae->tmp)
h2e = sta->sae->h2e;
if (status == WLAN_STATUS_SAE_HASH_TO_ELEMENT)
h2e = 1;
data = auth_build_token_req(
&hapd->last_comeback_key_update,
hapd->comeback_key,
hapd->comeback_idx,
hapd->comeback_pending_idx,
sizeof(hapd->comeback_pending_idx),
sta->sae->group,
sta->addr, h2e);
resp = WLAN_STATUS_ANTI_CLOGGING_TOKEN_REQ;
#ifdef ESP_SUPPLICANT
sta->sae_commit_processing = false;
#endif /* ESP_SUPPLICANT */
goto reply;
}
resp = sae_sm_step(hapd, sta, bssid, auth_transaction,
status, allow_reuse, &sta_removed);
} else if (auth_transaction == 2) {
if (status != WLAN_STATUS_SUCCESS) {
goto remove_sta;
}
const u8 *var;
size_t var_len;
u16 peer_send_confirm;
var = buf;
var_len = len;
if (var_len < 2) {
resp = WLAN_STATUS_UNSPECIFIED_FAILURE;
goto reply;
}
peer_send_confirm = WPA_GET_LE16(var);
if (sta->sae->state == SAE_ACCEPTED &&
(peer_send_confirm <= sta->sae->rc ||
peer_send_confirm == 0xffff)) {
wpa_printf(MSG_DEBUG,
"SAE: Silently ignore unexpected Confirm from peer "
MACSTR
" (peer-send-confirm=%u Rc=%u)",
MAC2STR(sta->addr),
peer_send_confirm, sta->sae->rc);
return 0;
}
if (sae_check_confirm(sta->sae, buf, len) < 0) {
resp = WLAN_STATUS_CHALLENGE_FAIL;
wifi_event_ap_wrong_password_t evt = {0};
os_memcpy(evt.mac, bssid, ETH_ALEN);
esp_event_post(WIFI_EVENT, WIFI_EVENT_AP_WRONG_PASSWORD, &evt,
sizeof(evt), 0);
goto reply;
}
sta->sae->rc = peer_send_confirm;
resp = sae_sm_step(hapd, sta, bssid, auth_transaction,
status, 0, &sta_removed);
} else {
wpa_printf(MSG_ERROR, "unexpected SAE authentication transaction %u (status=%u )", auth_transaction, status);
if (status != WLAN_STATUS_SUCCESS) {
goto remove_sta;
}
resp = WLAN_STATUS_UNKNOWN_AUTH_TRANSACTION;
}
reply:
if (!sta_removed && resp != WLAN_STATUS_SUCCESS) {
pos = buf;
end = buf + len;
/* Copy the Finite Cyclic Group field from the request if we
* rejected it as unsupported group. */
if (resp == WLAN_STATUS_FINITE_CYCLIC_GROUP_NOT_SUPPORTED &&
!data && end - pos >= 2) {
data = wpabuf_alloc_copy(pos, 2);
}
#ifdef ESP_SUPPLICANT
if (!sta->remove_pending) {
esp_send_sae_auth_reply(hapd, bssid, bssid, WLAN_AUTH_SAE,
auth_transaction, resp,
data ? wpabuf_head(data) : (u8 *) "",
data ? wpabuf_len(data) : 0);
}
#endif /* ESP_SUPPLICANT */
}
remove_sta:
wpabuf_free(data);
return resp;
}
int auth_sae_queue(struct hostapd_data *hapd,
u8 *buf, size_t len, u8 *bssid, u16 status, u32 auth_transaction)
{
struct hostapd_sae_commit_queue *q, *q2;
unsigned int queue_len;
queue_len = dl_list_len(&hapd->sae_commit_queue);
if (queue_len >= hapd->conf->max_num_sta) {
wpa_printf(MSG_DEBUG,
"SAE: No more room in message queue - drop the new frame from "
MACSTR, MAC2STR(bssid));
return 0;
}
wpa_printf(MSG_DEBUG, "SAE: Queue Authentication message from "
MACSTR " for processing (queue_len %u)", MAC2STR(bssid),
queue_len);
q = os_zalloc(sizeof(*q) + len);
if (!q) {
return -1;
}
q->len = len;
os_memcpy(q->msg, buf, len);
os_memcpy(q->bssid, bssid, ETH_ALEN);
q->auth_transaction = auth_transaction;
q->status = status;
/* Check whether there is already a queued Authentication frame from the
* same station with the same transaction number and if so, replace that
* queue entry with the new one. This avoids issues with a peer that
* sends multiple times (e.g., due to frequent SAE retries). There is no
* point in us trying to process the old attempts after a new one has
* obsoleted them. */
dl_list_for_each(q2, &hapd->sae_commit_queue,
struct hostapd_sae_commit_queue, list) {
if (os_memcmp(bssid, q2->bssid, ETH_ALEN) == 0 &&
auth_transaction == q2->auth_transaction) {
wpa_printf(MSG_DEBUG,
"SAE: Replace queued message from same STA with same transaction number");
dl_list_add(&q2->list, &q->list);
dl_list_del(&q2->list);
os_free(q2);
goto queued;
}
}
/* No pending identical entry, so add to the end of the queue */
dl_list_add_tail(&hapd->sae_commit_queue, &q->list);
queued:
#ifdef ESP_SUPPLICANT
/* posting event to the task to handle commit */
if (wpa3_hostap_post_evt(SIG_WPA3_RX_COMMIT, 0) != 0) {
wpa_printf(MSG_ERROR, "failed to queue commit build event");
return -1;
}
return 0;
#endif /* ESP_SUPPLICANT */
}
#endif /* CONFIG_SAE */
u16 wpa_res_to_status_code(enum wpa_validate_result res)
{
switch (res) {
case WPA_IE_OK:
return WLAN_STATUS_SUCCESS;
case WPA_INVALID_IE:
return WLAN_STATUS_INVALID_IE;
case WPA_INVALID_GROUP:
return WLAN_STATUS_GROUP_CIPHER_NOT_VALID;
case WPA_INVALID_PAIRWISE:
return WLAN_STATUS_PAIRWISE_CIPHER_NOT_VALID;
case WPA_INVALID_AKMP:
return WLAN_STATUS_AKMP_NOT_VALID;
case WPA_NOT_ENABLED:
return WLAN_STATUS_INVALID_IE;
case WPA_ALLOC_FAIL:
return WLAN_STATUS_UNSPECIFIED_FAILURE;
case WPA_MGMT_FRAME_PROTECTION_VIOLATION:
return WLAN_STATUS_ROBUST_MGMT_FRAME_POLICY_VIOLATION;
case WPA_INVALID_MGMT_GROUP_CIPHER:
return WLAN_STATUS_CIPHER_REJECTED_PER_POLICY;
case WPA_INVALID_MDIE:
return WLAN_STATUS_INVALID_MDIE;
case WPA_INVALID_PROTO:
return WLAN_STATUS_INVALID_IE;
case WPA_INVALID_PMKID:
return WLAN_STATUS_INVALID_PMKID;
case WPA_DENIED_OTHER_REASON:
return WLAN_STATUS_ASSOC_DENIED_UNSPEC;
}
return WLAN_STATUS_INVALID_IE;
}
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