hostap/wpa_supplicant/sme.c
Jouni Malinen a0b2f99bd7 nl80211: Fix static WEP key configuration when using SME
Need to set WEP keys before requesting authentication in order to get
Shared Key authentication working. Previously, the WEP keys were not set
at all when using SME in wpa_supplicant.
2009-04-04 16:58:16 +03:00

363 lines
11 KiB
C

/*
* wpa_supplicant - SME
* Copyright (c) 2009, 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 "ieee802_11_defs.h"
#include "eapol_supp/eapol_supp_sm.h"
#include "wpa_common.h"
#include "wpa.h"
#include "pmksa_cache.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "wpas_glue.h"
#include "wps_supplicant.h"
#include "sme.h"
void sme_authenticate(struct wpa_supplicant *wpa_s,
struct wpa_scan_res *bss, struct wpa_ssid *ssid)
{
struct wpa_driver_auth_params params;
const u8 *ie;
#ifdef CONFIG_IEEE80211R
const u8 *md = NULL;
#endif /* CONFIG_IEEE80211R */
int i;
if (bss == NULL) {
wpa_printf(MSG_ERROR, "SME: No scan result available for the "
"network");
return;
}
os_memset(&params, 0, sizeof(params));
wpa_s->reassociate = 0;
params.freq = bss->freq;
params.bssid = bss->bssid;
ie = wpa_scan_get_ie(bss, WLAN_EID_SSID);
if (ie == NULL) {
wpa_printf(MSG_ERROR, "SME: SSID not available for the BSS");
return;
}
params.ssid = ie + 2;
params.ssid_len = ie[1];
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 = AUTH_ALG_OPEN_SYSTEM;
#ifdef IEEE8021X_EAPOL
if (ssid->key_mgmt & WPA_KEY_MGMT_IEEE8021X_NO_WPA) {
if (ssid->leap) {
if (ssid->non_leap == 0)
params.auth_alg = AUTH_ALG_LEAP;
else
params.auth_alg |= 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 = 0;
if (ssid->auth_alg & WPA_AUTH_ALG_OPEN)
params.auth_alg |= AUTH_ALG_OPEN_SYSTEM;
if (ssid->auth_alg & WPA_AUTH_ALG_SHARED)
params.auth_alg |= AUTH_ALG_SHARED_KEY;
if (ssid->auth_alg & WPA_AUTH_ALG_LEAP)
params.auth_alg |= AUTH_ALG_LEAP;
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;
os_memset(wpa_s->bssid, 0, ETH_ALEN);
os_memcpy(wpa_s->pending_bssid, bss->bssid, ETH_ALEN);
if (bss && (wpa_scan_get_vendor_ie(bss, WPA_IE_VENDOR_TYPE) ||
wpa_scan_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_scan_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, md, NULL, 0, NULL);
if (md) {
/* Prepare for the next transition */
wpa_ft_prepare_auth_request(wpa_s->wpa);
}
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 = 0;
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_printf(MSG_DEBUG, "SME: Trying to use FT "
"over-the-air");
params.auth_alg = 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
switch (ssid->ieee80211w) {
case NO_IEEE80211W:
wpa_s->sme.mfp = NO_MGMT_FRAME_PROTECTION;
break;
case IEEE80211W_OPTIONAL:
wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_OPTIONAL;
break;
case IEEE80211W_REQUIRED:
wpa_s->sme.mfp = MGMT_FRAME_PROTECTION_REQUIRED;
break;
}
if (ssid->ieee80211w != NO_IEEE80211W && bss) {
const u8 *rsn = wpa_scan_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 */
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);
wpa_s->current_ssid = ssid;
wpa_supplicant_rsn_supp_set_config(wpa_s, wpa_s->current_ssid);
wpa_supplicant_initiate_eapol(wpa_s);
if (wpa_drv_authenticate(wpa_s, &params) < 0) {
wpa_msg(wpa_s, MSG_INFO, "Authentication request to the "
"driver failed");
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_driver_associate_params params;
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);
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 */
os_memset(&params, 0, sizeof(params));
params.bssid = data->auth.peer;
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;
#ifdef CONFIG_IEEE80211R
if (data->auth.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 = ssid->mode;
params.mgmt_frame_protection = wpa_s->sme.mfp;
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 (wpa_drv_associate(wpa_s, &params) < 0) {
wpa_msg(wpa_s, MSG_INFO, "Association request to the driver "
"failed");
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)
{
wpa_printf(MSG_DEBUG, "SME: Association failed: status code %d",
data->assoc_reject.status_code);
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);
/*
* TODO: if more than one possible AP is available in scan results,
* could try the other ones before requesting a new scan.
*/
wpa_supplicant_req_scan(wpa_s, 5, 0);
}