hostap/wpa_supplicant/sme.c
Jouni Malinen aca0160548 nl80211: Set cipher suites when using user space SME
Previously, pairwise and group cipher suites were configured only
when kernel SME (nl80211 connect API) was used. However, mac80211
needs this information even in the user space SME case for one
thing: to disable HT when TKIP/WEP is used. Add
NL80211_ATTR_CIPHER_SUITES_PAIRWISE to fix this special case with
user space SME. This allows mac80211 to disable HT properly when
the AP is configured with configuration that is not allowed.
2010-12-13 21:08:53 +02:00

502 lines
15 KiB
C

/*
* wpa_supplicant - SME
* Copyright (c) 2009-2010, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "common/wpa_common.h"
#include "rsn_supp/wpa.h"
#include "rsn_supp/pmksa_cache.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "wpas_glue.h"
#include "wps_supplicant.h"
#include "p2p_supplicant.h"
#include "notify.h"
#include "blacklist.h"
#include "bss.h"
#include "scan.h"
#include "sme.h"
void sme_authenticate(struct wpa_supplicant *wpa_s,
struct wpa_bss *bss, struct wpa_ssid *ssid)
{
struct wpa_driver_auth_params params;
struct wpa_ssid *old_ssid;
#ifdef CONFIG_IEEE80211R
const u8 *ie;
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211R
const u8 *md = NULL;
#endif /* CONFIG_IEEE80211R */
int i, bssid_changed;
if (bss == NULL) {
wpa_printf(MSG_ERROR, "SME: No scan result available for the "
"network");
return;
}
wpa_s->current_bss = bss;
os_memset(&params, 0, sizeof(params));
wpa_s->reassociate = 0;
params.freq = bss->freq;
params.bssid = bss->bssid;
params.ssid = bss->ssid;
params.ssid_len = bss->ssid_len;
if (wpa_s->sme.ssid_len != params.ssid_len ||
os_memcmp(wpa_s->sme.ssid, params.ssid, params.ssid_len) != 0)
wpa_s->sme.prev_bssid_set = 0;
wpa_s->sme.freq = params.freq;
os_memcpy(wpa_s->sme.ssid, params.ssid, params.ssid_len);
wpa_s->sme.ssid_len = params.ssid_len;
params.auth_alg = WPA_AUTH_ALG_OPEN;
#ifdef IEEE8021X_EAPOL
if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
if (ssid->leap) {
if (ssid->non_leap == 0)
params.auth_alg = WPA_AUTH_ALG_LEAP;
else
params.auth_alg |= WPA_AUTH_ALG_LEAP;
}
}
#endif /* IEEE8021X_EAPOL */
wpa_printf(MSG_DEBUG, "Automatic auth_alg selection: 0x%x",
params.auth_alg);
if (ssid->auth_alg) {
params.auth_alg = ssid->auth_alg;
wpa_printf(MSG_DEBUG, "Overriding auth_alg selection: 0x%x",
params.auth_alg);
}
for (i = 0; i < NUM_WEP_KEYS; i++) {
if (ssid->wep_key_len[i])
params.wep_key[i] = ssid->wep_key[i];
params.wep_key_len[i] = ssid->wep_key_len[i];
}
params.wep_tx_keyidx = ssid->wep_tx_keyidx;
bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
os_memset(wpa_s->bssid, 0, ETH_ALEN);
os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
if (bssid_changed)
wpas_notify_bssid_changed(wpa_s);
if ((wpa_bss_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
(ssid->key_mgmt & (WPA_KEY_MGMT_IEEE8021X | WPA_KEY_MGMT_PSK |
WPA_KEY_MGMT_FT_IEEE8021X |
WPA_KEY_MGMT_FT_PSK |
WPA_KEY_MGMT_IEEE8021X_SHA256 |
WPA_KEY_MGMT_PSK_SHA256))) {
int try_opportunistic;
try_opportunistic = ssid->proactive_key_caching &&
(ssid->proto & WPA_PROTO_RSN);
if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
wpa_s->current_ssid,
try_opportunistic) == 0)
eapol_sm_notify_pmkid_attempt(wpa_s->eapol, 1);
wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
wpa_s->sme.assoc_req_ie,
&wpa_s->sme.assoc_req_ie_len)) {
wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
"management and encryption suites");
return;
}
} else if (ssid->key_mgmt &
(WPA_KEY_MGMT_PSK | WPA_KEY_MGMT_IEEE8021X |
WPA_KEY_MGMT_WPA_NONE | WPA_KEY_MGMT_FT_PSK |
WPA_KEY_MGMT_FT_IEEE8021X | WPA_KEY_MGMT_PSK_SHA256 |
WPA_KEY_MGMT_IEEE8021X_SHA256)) {
wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
if (wpa_supplicant_set_suites(wpa_s, NULL, ssid,
wpa_s->sme.assoc_req_ie,
&wpa_s->sme.assoc_req_ie_len)) {
wpa_printf(MSG_WARNING, "SME: Failed to set WPA key "
"management and encryption suites (no scan "
"results)");
return;
}
#ifdef CONFIG_WPS
} else if (ssid->key_mgmt & WPA_KEY_MGMT_WPS) {
struct wpabuf *wps_ie;
wps_ie = wps_build_assoc_req_ie(wpas_wps_get_req_type(ssid));
if (wps_ie && wpabuf_len(wps_ie) <=
sizeof(wpa_s->sme.assoc_req_ie)) {
wpa_s->sme.assoc_req_ie_len = wpabuf_len(wps_ie);
os_memcpy(wpa_s->sme.assoc_req_ie, wpabuf_head(wps_ie),
wpa_s->sme.assoc_req_ie_len);
} else
wpa_s->sme.assoc_req_ie_len = 0;
wpabuf_free(wps_ie);
wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
#endif /* CONFIG_WPS */
} else {
wpa_supplicant_set_non_wpa_policy(wpa_s, ssid);
wpa_s->sme.assoc_req_ie_len = 0;
}
#ifdef CONFIG_IEEE80211R
ie = wpa_bss_get_ie(bss, WLAN_EID_MOBILITY_DOMAIN);
if (ie && ie[1] >= MOBILITY_DOMAIN_ID_LEN)
md = ie + 2;
wpa_sm_set_ft_params(wpa_s->wpa, ie, ie ? 2 + ie[1] : 0);
if (md) {
/* Prepare for the next transition */
wpa_ft_prepare_auth_request(wpa_s->wpa, ie);
}
if (md && ssid->key_mgmt & (WPA_KEY_MGMT_FT_PSK |
WPA_KEY_MGMT_FT_IEEE8021X)) {
if (wpa_s->sme.assoc_req_ie_len + 5 <
sizeof(wpa_s->sme.assoc_req_ie)) {
struct rsn_mdie *mdie;
u8 *pos = wpa_s->sme.assoc_req_ie +
wpa_s->sme.assoc_req_ie_len;
*pos++ = WLAN_EID_MOBILITY_DOMAIN;
*pos++ = sizeof(*mdie);
mdie = (struct rsn_mdie *) pos;
os_memcpy(mdie->mobility_domain, md,
MOBILITY_DOMAIN_ID_LEN);
mdie->ft_capab = md[MOBILITY_DOMAIN_ID_LEN];
wpa_s->sme.assoc_req_ie_len += 5;
}
if (wpa_s->sme.ft_used &&
os_memcmp(md, wpa_s->sme.mobility_domain, 2) == 0 &&
wpa_sm_has_ptk(wpa_s->wpa)) {
wpa_printf(MSG_DEBUG, "SME: Trying to use FT "
"over-the-air");
params.auth_alg = WPA_AUTH_ALG_FT;
params.ie = wpa_s->sme.ft_ies;
params.ie_len = wpa_s->sme.ft_ies_len;
}
}
#endif /* CONFIG_IEEE80211R */
#ifdef CONFIG_IEEE80211W
wpa_s->sme.mfp = ssid->ieee80211w;
if (ssid->ieee80211w != NO_MGMT_FRAME_PROTECTION) {
const u8 *rsn = wpa_bss_get_ie(bss, WLAN_EID_RSN);
struct wpa_ie_data _ie;
if (rsn && wpa_parse_wpa_ie(rsn, 2 + rsn[1], &_ie) == 0 &&
_ie.capabilities &
(WPA_CAPABILITY_MFPC | WPA_CAPABILITY_MFPR)) {
wpa_printf(MSG_DEBUG, "WPA: Selected AP supports MFP: "
"require MFP");
wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
}
}
#endif /* CONFIG_IEEE80211W */
#ifdef CONFIG_P2P
if (wpa_s->global->p2p) {
u8 *pos;
size_t len;
int res;
int p2p_group;
p2p_group = wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE;
pos = wpa_s->sme.assoc_req_ie + wpa_s->sme.assoc_req_ie_len;
len = sizeof(wpa_s->sme.assoc_req_ie) -
wpa_s->sme.assoc_req_ie_len;
res = wpas_p2p_assoc_req_ie(wpa_s, bss, pos, len, p2p_group);
if (res >= 0)
wpa_s->sme.assoc_req_ie_len += res;
}
#endif /* CONFIG_P2P */
wpa_supplicant_cancel_scan(wpa_s);
wpa_msg(wpa_s, MSG_INFO, "Trying to authenticate with " MACSTR
" (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
wpa_ssid_txt(params.ssid, params.ssid_len), params.freq);
wpa_clear_keys(wpa_s, bss->bssid);
wpa_supplicant_set_state(wpa_s, WPA_AUTHENTICATING);
old_ssid = wpa_s->current_ssid;
wpa_s->current_ssid = ssid;
wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
wpa_supplicant_initiate_eapol(wpa_s);
if (old_ssid != wpa_s->current_ssid)
wpas_notify_network_changed(wpa_s);
wpa_s->sme.auth_alg = params.auth_alg;
if (wpa_drv_authenticate(wpa_s, &params) < 0) {
wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
"driver failed");
wpa_supplicant_req_scan(wpa_s, 1, 0);
return;
}
/* TODO: add timeout on authentication */
/*
* Association will be started based on the authentication event from
* the driver.
*/
}
void sme_event_auth(struct wpa_supplicant *wpa_s, union wpa_event_data *data)
{
struct wpa_ssid *ssid = wpa_s->current_ssid;
if (ssid == NULL) {
wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
"network is not selected");
return;
}
if (wpa_s->wpa_state != WPA_AUTHENTICATING) {
wpa_printf(MSG_DEBUG, "SME: Ignore authentication event when "
"not in authenticating state");
return;
}
if (os_memcmp(wpa_s->pending_bssid, data->auth.peer, ETH_ALEN) != 0) {
wpa_printf(MSG_DEBUG, "SME: Ignore authentication with "
"unexpected peer " MACSTR,
MAC2STR(data->auth.peer));
return;
}
wpa_printf(MSG_DEBUG, "SME: Authentication response: peer=" MACSTR
" auth_type=%d status_code=%d",
MAC2STR(data->auth.peer), data->auth.auth_type,
data->auth.status_code);
wpa_hexdump(MSG_MSGDUMP, "SME: Authentication response IEs",
data->auth.ies, data->auth.ies_len);
if (data->auth.status_code != WLAN_STATUS_SUCCESS) {
wpa_printf(MSG_DEBUG, "SME: Authentication failed (status "
"code %d)", data->auth.status_code);
if (data->auth.status_code !=
WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG ||
wpa_s->sme.auth_alg == data->auth.auth_type ||
wpa_s->current_ssid->auth_alg == WPA_AUTH_ALG_LEAP) {
wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
return;
}
switch (data->auth.auth_type) {
case WLAN_AUTH_OPEN:
wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_SHARED;
wpa_printf(MSG_DEBUG, "SME: Trying SHARED auth");
wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
wpa_s->current_ssid);
return;
case WLAN_AUTH_SHARED_KEY:
wpa_s->current_ssid->auth_alg = WPA_AUTH_ALG_LEAP;
wpa_printf(MSG_DEBUG, "SME: Trying LEAP auth");
wpa_supplicant_associate(wpa_s, wpa_s->current_bss,
wpa_s->current_ssid);
return;
default:
return;
}
}
#ifdef CONFIG_IEEE80211R
if (data->auth.auth_type == WLAN_AUTH_FT) {
union wpa_event_data edata;
os_memset(&edata, 0, sizeof(edata));
edata.ft_ies.ies = data->auth.ies;
edata.ft_ies.ies_len = data->auth.ies_len;
os_memcpy(edata.ft_ies.target_ap, data->auth.peer, ETH_ALEN);
wpa_supplicant_event(wpa_s, EVENT_FT_RESPONSE, &edata);
}
#endif /* CONFIG_IEEE80211R */
sme_associate(wpa_s, ssid->mode, data->auth.peer,
data->auth.auth_type);
}
void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
const u8 *bssid, u16 auth_type)
{
struct wpa_driver_associate_params params;
struct ieee802_11_elems elems;
os_memset(&params, 0, sizeof(params));
params.bssid = bssid;
params.ssid = wpa_s->sme.ssid;
params.ssid_len = wpa_s->sme.ssid_len;
params.freq = wpa_s->sme.freq;
params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
wpa_s->sme.assoc_req_ie : NULL;
params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;
params.pairwise_suite = cipher_suite2driver(wpa_s->pairwise_cipher);
params.group_suite = cipher_suite2driver(wpa_s->group_cipher);
#ifdef CONFIG_IEEE80211R
if (auth_type == WLAN_AUTH_FT && wpa_s->sme.ft_ies) {
params.wpa_ie = wpa_s->sme.ft_ies;
params.wpa_ie_len = wpa_s->sme.ft_ies_len;
}
#endif /* CONFIG_IEEE80211R */
params.mode = mode;
params.mgmt_frame_protection = wpa_s->sme.mfp;
if (wpa_s->sme.prev_bssid_set)
params.prev_bssid = wpa_s->sme.prev_bssid;
wpa_msg(wpa_s, MSG_INFO, "Trying to associate with " MACSTR
" (SSID='%s' freq=%d MHz)", MAC2STR(params.bssid),
params.ssid ? wpa_ssid_txt(params.ssid, params.ssid_len) : "",
params.freq);
wpa_supplicant_set_state(wpa_s, WPA_ASSOCIATING);
if (params.wpa_ie == NULL ||
ieee802_11_parse_elems(params.wpa_ie, params.wpa_ie_len, &elems, 0)
< 0) {
wpa_printf(MSG_DEBUG, "SME: Could not parse own IEs?!");
os_memset(&elems, 0, sizeof(elems));
}
if (elems.rsn_ie)
wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.rsn_ie - 2,
elems.rsn_ie_len + 2);
else if (elems.wpa_ie)
wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, elems.wpa_ie - 2,
elems.wpa_ie_len + 2);
else
wpa_sm_set_assoc_wpa_ie(wpa_s->wpa, NULL, 0);
if (elems.p2p &&
(wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE))
params.p2p = 1;
if (wpa_s->parent->set_sta_uapsd)
params.uapsd = wpa_s->parent->sta_uapsd;
else
params.uapsd = -1;
if (wpa_drv_associate(wpa_s, &params) < 0) {
wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
"failed");
wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
return;
}
/* TODO: add timeout on association */
}
int sme_update_ft_ies(struct wpa_supplicant *wpa_s, const u8 *md,
const u8 *ies, size_t ies_len)
{
if (md == NULL || ies == NULL) {
wpa_printf(MSG_DEBUG, "SME: Remove mobility domain");
os_free(wpa_s->sme.ft_ies);
wpa_s->sme.ft_ies = NULL;
wpa_s->sme.ft_ies_len = 0;
wpa_s->sme.ft_used = 0;
return 0;
}
os_memcpy(wpa_s->sme.mobility_domain, md, MOBILITY_DOMAIN_ID_LEN);
wpa_hexdump(MSG_DEBUG, "SME: FT IEs", ies, ies_len);
os_free(wpa_s->sme.ft_ies);
wpa_s->sme.ft_ies = os_malloc(ies_len);
if (wpa_s->sme.ft_ies == NULL)
return -1;
os_memcpy(wpa_s->sme.ft_ies, ies, ies_len);
wpa_s->sme.ft_ies_len = ies_len;
return 0;
}
void sme_event_assoc_reject(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
int bssid_changed;
wpa_printf(MSG_DEBUG, "SME: Association with " MACSTR " failed: "
"status code %d", MAC2STR(wpa_s->pending_bssid),
data->assoc_reject.status_code);
bssid_changed = !is_zero_ether_addr(wpa_s->bssid);
/*
* For now, unconditionally terminate the previous authentication. In
* theory, this should not be needed, but mac80211 gets quite confused
* if the authentication is left pending.. Some roaming cases might
* benefit from using the previous authentication, so this could be
* optimized in the future.
*/
if (wpa_drv_deauthenticate(wpa_s, wpa_s->pending_bssid,
WLAN_REASON_DEAUTH_LEAVING) < 0) {
wpa_msg(wpa_s, MSG_INFO,
"Deauth request to the driver failed");
}
wpa_s->sme.prev_bssid_set = 0;
wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
os_memset(wpa_s->bssid, 0, ETH_ALEN);
os_memset(wpa_s->pending_bssid, 0, ETH_ALEN);
if (bssid_changed)
wpas_notify_bssid_changed(wpa_s);
}
void sme_event_auth_timed_out(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
wpa_printf(MSG_DEBUG, "SME: Authentication timed out");
wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
}
void sme_event_assoc_timed_out(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
wpa_printf(MSG_DEBUG, "SME: Association timed out");
wpas_connection_failed(wpa_s, wpa_s->pending_bssid);
wpa_supplicant_mark_disassoc(wpa_s);
}
void sme_event_disassoc(struct wpa_supplicant *wpa_s,
union wpa_event_data *data)
{
wpa_printf(MSG_DEBUG, "SME: Disassociation event received");
if (wpa_s->sme.prev_bssid_set &&
!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_USER_SPACE_MLME)) {
/*
* cfg80211/mac80211 can get into somewhat confused state if
* the AP only disassociates us and leaves us in authenticated
* state. For now, force the state to be cleared to avoid
* confusing errors if we try to associate with the AP again.
*/
wpa_printf(MSG_DEBUG, "SME: Deauthenticate to clear driver "
"state");
wpa_drv_deauthenticate(wpa_s, wpa_s->sme.prev_bssid,
WLAN_REASON_DEAUTH_LEAVING);
}
}