hostap/hostapd/wps_hostapd.c
Jouni Malinen 08bec36178 WPS: Added support for wildcard PINs that work with any UUID-E
Since the Registrar may not yet know the UUID-E when a new PIN is
entered, use of a wildcard PIN that works with any UUID-E can be useful.
Such a PIN will be bound to the first Enrollee trying to use it and it
will be invalidated after the first use.
2008-11-30 20:32:03 +02:00

613 lines
16 KiB
C

/*
* hostapd / WPS integration
* Copyright (c) 2008, 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 "hostapd.h"
#include "driver.h"
#include "eloop.h"
#include "uuid.h"
#include "wpa_ctrl.h"
#include "ctrl_iface.h"
#include "ieee802_11_defs.h"
#include "wps/wps.h"
#include "wps/wps_defs.h"
#include "wps/wps_dev_attr.h"
#include "wps_hostapd.h"
static int hostapd_wps_new_psk_cb(void *ctx, const u8 *mac_addr, const u8 *psk,
size_t psk_len)
{
struct hostapd_data *hapd = ctx;
struct hostapd_wpa_psk *p;
struct hostapd_ssid *ssid = &hapd->conf->ssid;
wpa_printf(MSG_DEBUG, "Received new WPA/WPA2-PSK from WPS for STA "
MACSTR, MAC2STR(mac_addr));
wpa_hexdump_key(MSG_DEBUG, "Per-device PSK", psk, psk_len);
if (psk_len != PMK_LEN) {
wpa_printf(MSG_DEBUG, "Unexpected PSK length %lu",
(unsigned long) psk_len);
return -1;
}
/* Add the new PSK to runtime PSK list */
p = os_zalloc(sizeof(*p));
if (p == NULL)
return -1;
os_memcpy(p->addr, mac_addr, ETH_ALEN);
os_memcpy(p->psk, psk, PMK_LEN);
p->next = ssid->wpa_psk;
ssid->wpa_psk = p;
if (ssid->wpa_psk_file) {
FILE *f;
char hex[PMK_LEN * 2 + 1];
/* Add the new PSK to PSK list file */
f = fopen(ssid->wpa_psk_file, "a");
if (f == NULL) {
wpa_printf(MSG_DEBUG, "Failed to add the PSK to "
"'%s'", ssid->wpa_psk_file);
return -1;
}
wpa_snprintf_hex(hex, sizeof(hex), psk, psk_len);
fprintf(f, MACSTR " %s\n", MAC2STR(mac_addr), hex);
fclose(f);
}
return 0;
}
static int hostapd_wps_set_ie_cb(void *ctx, const u8 *beacon_ie,
size_t beacon_ie_len, const u8 *probe_resp_ie,
size_t probe_resp_ie_len)
{
struct hostapd_data *hapd = ctx;
os_free(hapd->wps_beacon_ie);
if (beacon_ie_len == 0) {
hapd->wps_beacon_ie = NULL;
hapd->wps_beacon_ie_len = 0;
} else {
hapd->wps_beacon_ie = os_malloc(beacon_ie_len);
if (hapd->wps_beacon_ie == NULL) {
hapd->wps_beacon_ie_len = 0;
return -1;
}
os_memcpy(hapd->wps_beacon_ie, beacon_ie, beacon_ie_len);
hapd->wps_beacon_ie_len = beacon_ie_len;
}
hostapd_set_wps_beacon_ie(hapd, hapd->wps_beacon_ie,
hapd->wps_beacon_ie_len);
os_free(hapd->wps_probe_resp_ie);
if (probe_resp_ie_len == 0) {
hapd->wps_probe_resp_ie = NULL;
hapd->wps_probe_resp_ie_len = 0;
} else {
hapd->wps_probe_resp_ie = os_malloc(probe_resp_ie_len);
if (hapd->wps_probe_resp_ie == NULL) {
hapd->wps_probe_resp_ie_len = 0;
return -1;
}
os_memcpy(hapd->wps_probe_resp_ie, probe_resp_ie,
probe_resp_ie_len);
hapd->wps_probe_resp_ie_len = probe_resp_ie_len;
}
hostapd_set_wps_probe_resp_ie(hapd, hapd->wps_probe_resp_ie,
hapd->wps_probe_resp_ie_len);
return 0;
}
static void hostapd_wps_pin_needed_cb(void *ctx, const u8 *uuid_e,
const struct wps_device_data *dev)
{
struct hostapd_data *hapd = ctx;
char uuid[40], txt[400];
int len;
if (uuid_bin2str(uuid_e, uuid, sizeof(uuid)))
return;
wpa_printf(MSG_DEBUG, "WPS: PIN needed for E-UUID %s", uuid);
len = os_snprintf(txt, sizeof(txt), WPS_EVENT_PIN_NEEDED
"%s " MACSTR " [%s|%s|%s|%s|%s|%d-%08X-%d]",
uuid, MAC2STR(dev->mac_addr), dev->device_name,
dev->manufacturer, dev->model_name,
dev->model_number, dev->serial_number,
dev->categ, dev->oui, dev->sub_categ);
if (len > 0 && len < (int) sizeof(txt))
hostapd_ctrl_iface_send(hapd, MSG_INFO, txt, len);
if (hapd->conf->wps_pin_requests) {
FILE *f;
struct os_time t;
f = fopen(hapd->conf->wps_pin_requests, "a");
if (f == NULL)
return;
os_get_time(&t);
fprintf(f, "%ld\t%s\t" MACSTR "\t%s\t%s\t%s\t%s\t%s"
"\t%d-%08X-%d\n",
t.sec, uuid, MAC2STR(dev->mac_addr), dev->device_name,
dev->manufacturer, dev->model_name, dev->model_number,
dev->serial_number,
dev->categ, dev->oui, dev->sub_categ);
fclose(f);
}
}
static int str_starts(const char *str, const char *start)
{
return os_strncmp(str, start, os_strlen(start)) == 0;
}
static void wps_reload_config(void *eloop_data, void *user_ctx)
{
struct hostapd_iface *iface = eloop_data;
wpa_printf(MSG_DEBUG, "WPS: Reload configuration data");
if (hostapd_reload_config(iface) < 0) {
wpa_printf(MSG_WARNING, "WPS: Failed to reload the updated "
"configuration");
}
}
static int hostapd_wps_cred_cb(void *ctx, const struct wps_credential *cred)
{
struct hostapd_data *hapd = ctx;
FILE *oconf, *nconf;
size_t len, i;
char *tmp_fname;
char buf[1024];
int multi_bss;
int wpa;
wpa_printf(MSG_DEBUG, "WPS: Received new AP Settings");
wpa_hexdump_ascii(MSG_DEBUG, "WPS: SSID", cred->ssid, cred->ssid_len);
wpa_printf(MSG_DEBUG, "WPS: Authentication Type 0x%x",
cred->auth_type);
wpa_printf(MSG_DEBUG, "WPS: Encryption Type 0x%x", cred->encr_type);
wpa_printf(MSG_DEBUG, "WPS: Network Key Index %d", cred->key_idx);
wpa_hexdump_key(MSG_DEBUG, "WPS: Network Key",
cred->key, cred->key_len);
wpa_printf(MSG_DEBUG, "WPS: MAC Address " MACSTR,
MAC2STR(cred->mac_addr));
hostapd_ctrl_iface_send(hapd, MSG_INFO, WPS_EVENT_NEW_AP_SETTINGS,
os_strlen(WPS_EVENT_NEW_AP_SETTINGS));
len = os_strlen(hapd->iface->config_fname) + 5;
tmp_fname = os_malloc(len);
if (tmp_fname == NULL)
return -1;
os_snprintf(tmp_fname, len, "%s-new", hapd->iface->config_fname);
oconf = fopen(hapd->iface->config_fname, "r");
if (oconf == NULL) {
wpa_printf(MSG_WARNING, "WPS: Could not open current "
"configuration file");
os_free(tmp_fname);
return -1;
}
nconf = fopen(tmp_fname, "w");
if (nconf == NULL) {
wpa_printf(MSG_WARNING, "WPS: Could not write updated "
"configuration file");
os_free(tmp_fname);
fclose(oconf);
return -1;
}
fprintf(nconf, "# WPS configuration - START\n");
fprintf(nconf, "wps_state=2\n");
fprintf(nconf, "ssid=");
for (i = 0; i < cred->ssid_len; i++)
fputc(cred->ssid[i], nconf);
fprintf(nconf, "\n");
if ((cred->auth_type & (WPS_AUTH_WPA2 | WPS_AUTH_WPA2PSK)) &&
(cred->auth_type & (WPS_AUTH_WPA | WPS_AUTH_WPAPSK)))
wpa = 3;
else if (cred->auth_type & (WPS_AUTH_WPA2 | WPS_AUTH_WPA2PSK))
wpa = 2;
else if (cred->auth_type & (WPS_AUTH_WPA | WPS_AUTH_WPAPSK))
wpa = 1;
else
wpa = 0;
if (wpa) {
char *prefix;
fprintf(nconf, "wpa=%d\n", wpa);
fprintf(nconf, "wpa_key_mgmt=");
prefix = "";
if (cred->auth_type & (WPS_AUTH_WPA2 | WPS_AUTH_WPA)) {
fprintf(nconf, "WPA-EAP");
prefix = " ";
}
if (cred->auth_type & (WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK))
fprintf(nconf, "%sWPA-PSK", prefix);
fprintf(nconf, "\n");
fprintf(nconf, "wpa_pairwise=");
prefix = "";
if (cred->encr_type & WPS_ENCR_AES) {
fprintf(nconf, "CCMP");
prefix = " ";
}
if (cred->encr_type & WPS_ENCR_TKIP) {
fprintf(nconf, "%sTKIP", prefix);
}
fprintf(nconf, "\n");
if (cred->key_len >= 8 && cred->key_len < 64) {
fprintf(nconf, "wpa_passphrase=");
for (i = 0; i < cred->key_len; i++)
fputc(cred->key[i], nconf);
fprintf(nconf, "\n");
} else if (cred->key_len == 64) {
fprintf(nconf, "wpa_psk=");
for (i = 0; i < cred->key_len; i++)
fputc(cred->key[i], nconf);
fprintf(nconf, "\n");
} else {
wpa_printf(MSG_WARNING, "WPS: Invalid key length %lu "
"for WPA/WPA2",
(unsigned long) cred->key_len);
}
fprintf(nconf, "auth_algs=1\n");
} else {
if ((cred->auth_type & WPS_AUTH_OPEN) &&
(cred->auth_type & WPS_AUTH_SHARED))
fprintf(nconf, "auth_algs=3\n");
else if (cred->auth_type & WPS_AUTH_SHARED)
fprintf(nconf, "auth_algs=2\n");
else
fprintf(nconf, "auth_algs=1\n");
if (cred->encr_type & WPS_ENCR_WEP && cred->key_idx < 4) {
fprintf(nconf, "wep_default_key=%d\n", cred->key_idx);
fprintf(nconf, "wep_key%d=", cred->key_idx);
if (cred->key_len != 10 && cred->key_len != 26)
fputc('"', nconf);
for (i = 0; i < cred->key_len; i++)
fputc(cred->key[i], nconf);
if (cred->key_len != 10 && cred->key_len != 26)
fputc('"', nconf);
fprintf(nconf, "\n");
}
}
fprintf(nconf, "# WPS configuration - END\n");
multi_bss = 0;
while (fgets(buf, sizeof(buf), oconf)) {
if (os_strncmp(buf, "bss=", 4) == 0)
multi_bss = 1;
if (!multi_bss &&
(str_starts(buf, "ssid=") ||
str_starts(buf, "auth_algs=") ||
str_starts(buf, "wps_state=") ||
str_starts(buf, "wpa=") ||
str_starts(buf, "wpa_psk=") ||
str_starts(buf, "wpa_pairwise=") ||
str_starts(buf, "rsn_pairwise=") ||
str_starts(buf, "wpa_key_mgmt=") ||
str_starts(buf, "wpa_passphrase="))) {
fprintf(nconf, "#WPS# %s", buf);
} else
fprintf(nconf, "%s", buf);
}
fclose(nconf);
fclose(oconf);
if (rename(tmp_fname, hapd->iface->config_fname) < 0) {
wpa_printf(MSG_WARNING, "WPS: Failed to rename the updated "
"configuration file: %s", strerror(errno));
os_free(tmp_fname);
return -1;
}
os_free(tmp_fname);
/* Schedule configuration reload after short period of time to allow
* EAP-WSC to be finished.
*/
eloop_register_timeout(0, 100000, wps_reload_config, hapd->iface,
NULL);
/* TODO: dualband AP may need to update multiple configuration files */
wpa_printf(MSG_DEBUG, "WPS: AP configuration updated");
return 0;
}
static void hostapd_wps_clear_ies(struct hostapd_data *hapd)
{
os_free(hapd->wps_beacon_ie);
hapd->wps_beacon_ie = NULL;
hapd->wps_beacon_ie_len = 0;
hostapd_set_wps_beacon_ie(hapd, NULL, 0);
os_free(hapd->wps_probe_resp_ie);
hapd->wps_probe_resp_ie = NULL;
hapd->wps_probe_resp_ie_len = 0;
hostapd_set_wps_probe_resp_ie(hapd, NULL, 0);
}
int hostapd_init_wps(struct hostapd_data *hapd,
struct hostapd_bss_config *conf)
{
struct wps_context *wps;
struct wps_registrar_config cfg;
if (conf->wps_state == 0) {
hostapd_wps_clear_ies(hapd);
return 0;
}
wps = os_zalloc(sizeof(*wps));
if (wps == NULL)
return -1;
wps->cred_cb = hostapd_wps_cred_cb;
wps->cb_ctx = hapd;
os_memset(&cfg, 0, sizeof(cfg));
wps->wps_state = hapd->conf->wps_state;
wps->ap_setup_locked = hapd->conf->ap_setup_locked;
os_memcpy(wps->uuid, hapd->conf->uuid, UUID_LEN);
wps->ssid_len = hapd->conf->ssid.ssid_len;
os_memcpy(wps->ssid, hapd->conf->ssid.ssid, wps->ssid_len);
wps->ap = 1;
os_memcpy(wps->dev.mac_addr, hapd->own_addr, ETH_ALEN);
wps->dev.device_name = os_strdup(hapd->conf->device_name);
wps->dev.manufacturer = os_strdup(hapd->conf->manufacturer);
wps->dev.model_name = os_strdup(hapd->conf->model_name);
wps->dev.model_number = os_strdup(hapd->conf->model_number);
wps->dev.serial_number = os_strdup(hapd->conf->serial_number);
if (hapd->conf->config_methods) {
char *m = hapd->conf->config_methods;
if (os_strstr(m, "label"))
wps->config_methods |= WPS_CONFIG_LABEL;
if (os_strstr(m, "display"))
wps->config_methods |= WPS_CONFIG_DISPLAY;
if (os_strstr(m, "push_button"))
wps->config_methods |= WPS_CONFIG_PUSHBUTTON;
if (os_strstr(m, "keypad"))
wps->config_methods |= WPS_CONFIG_KEYPAD;
}
if (hapd->conf->device_type) {
char *pos;
u8 oui[4];
/* <categ>-<OUI>-<subcateg> */
wps->dev.categ = atoi(hapd->conf->device_type);
pos = os_strchr(hapd->conf->device_type, '-');
if (pos == NULL) {
wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
os_free(wps);
return -1;
}
pos++;
if (hexstr2bin(pos, oui, 4)) {
wpa_printf(MSG_ERROR, "WPS: Invalid device_type OUI");
os_free(wps);
return -1;
}
wps->dev.oui = WPA_GET_BE32(oui);
pos = os_strchr(pos, '-');
if (pos == NULL) {
wpa_printf(MSG_ERROR, "WPS: Invalid device_type");
os_free(wps);
return -1;
}
pos++;
wps->dev.sub_categ = atoi(pos);
}
wps->dev.os_version = WPA_GET_BE32(hapd->conf->os_version);
wps->dev.rf_bands = hapd->iconf->hw_mode == HOSTAPD_MODE_IEEE80211A ?
WPS_RF_50GHZ : WPS_RF_24GHZ; /* FIX: dualband AP */
if (conf->wpa & WPA_PROTO_RSN) {
if (conf->wpa_key_mgmt & WPA_KEY_MGMT_PSK)
wps->auth_types |= WPS_AUTH_WPA2PSK;
if (conf->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X)
wps->auth_types |= WPS_AUTH_WPA2;
if (conf->rsn_pairwise & WPA_CIPHER_CCMP)
wps->encr_types |= WPS_ENCR_AES;
if (conf->rsn_pairwise & WPA_CIPHER_TKIP)
wps->encr_types |= WPS_ENCR_TKIP;
}
if (conf->wpa & WPA_PROTO_WPA) {
if (conf->wpa_key_mgmt & WPA_KEY_MGMT_PSK)
wps->auth_types |= WPS_AUTH_WPAPSK;
if (conf->wpa_key_mgmt & WPA_KEY_MGMT_IEEE8021X)
wps->auth_types |= WPS_AUTH_WPA;
if (conf->wpa_pairwise & WPA_CIPHER_CCMP)
wps->encr_types |= WPS_ENCR_AES;
if (conf->wpa_pairwise & WPA_CIPHER_TKIP)
wps->encr_types |= WPS_ENCR_TKIP;
}
if (conf->ssid.security_policy == SECURITY_PLAINTEXT) {
wps->encr_types |= WPS_ENCR_NONE;
wps->auth_types |= WPS_AUTH_OPEN;
} else if (conf->ssid.security_policy == SECURITY_STATIC_WEP) {
wps->encr_types |= WPS_ENCR_WEP;
if (conf->auth_algs & WPA_AUTH_ALG_OPEN)
wps->auth_types |= WPS_AUTH_OPEN;
if (conf->auth_algs & WPA_AUTH_ALG_SHARED)
wps->auth_types |= WPS_AUTH_SHARED;
} else if (conf->ssid.security_policy == SECURITY_IEEE_802_1X) {
wps->auth_types |= WPS_AUTH_OPEN;
if (conf->default_wep_key_len)
wps->encr_types |= WPS_ENCR_WEP;
else
wps->encr_types |= WPS_ENCR_NONE;
}
if (conf->ssid.wpa_psk_file) {
/* Use per-device PSKs */
} else if (conf->ssid.wpa_passphrase) {
wps->network_key = (u8 *) os_strdup(conf->ssid.wpa_passphrase);
wps->network_key_len = os_strlen(conf->ssid.wpa_passphrase);
} else if (conf->ssid.wpa_psk) {
wps->network_key = os_malloc(2 * PMK_LEN + 1);
if (wps->network_key == NULL) {
os_free(wps);
return -1;
}
wpa_snprintf_hex((char *) wps->network_key, 2 * PMK_LEN + 1,
conf->ssid.wpa_psk->psk, PMK_LEN);
wps->network_key_len = 2 * PMK_LEN;
} else if (conf->ssid.wep.keys_set && conf->ssid.wep.key[0]) {
wps->network_key = os_malloc(conf->ssid.wep.len[0]);
if (wps->network_key == NULL) {
os_free(wps);
return -1;
}
os_memcpy(wps->network_key, conf->ssid.wep.key[0],
conf->ssid.wep.len[0]);
wps->network_key_len = conf->ssid.wep.len[0];
}
if (conf->wps_state == WPS_STATE_NOT_CONFIGURED) {
/* Override parameters to enable security by default */
wps->auth_types = WPS_AUTH_WPA2PSK | WPS_AUTH_WPAPSK;
wps->encr_types = WPS_ENCR_AES | WPS_ENCR_TKIP;
}
cfg.new_psk_cb = hostapd_wps_new_psk_cb;
cfg.set_ie_cb = hostapd_wps_set_ie_cb;
cfg.pin_needed_cb = hostapd_wps_pin_needed_cb;
cfg.cb_ctx = hapd;
wps->registrar = wps_registrar_init(wps, &cfg);
if (wps->registrar == NULL) {
printf("Failed to initialize WPS Registrar\n");
os_free(wps->network_key);
os_free(wps);
return -1;
}
hapd->wps = wps;
return 0;
}
void hostapd_deinit_wps(struct hostapd_data *hapd)
{
if (hapd->wps == NULL)
return;
wps_registrar_deinit(hapd->wps->registrar);
os_free(hapd->wps->network_key);
wps_device_data_free(&hapd->wps->dev);
os_free(hapd->wps);
hapd->wps = NULL;
hostapd_wps_clear_ies(hapd);
}
int hostapd_wps_add_pin(struct hostapd_data *hapd, const char *uuid,
const char *pin)
{
u8 u[UUID_LEN];
int any = 0;
if (hapd->wps == NULL)
return -1;
if (os_strcmp(uuid, "any") == 0)
any = 1;
else if (uuid_str2bin(uuid, u))
return -1;
return wps_registrar_add_pin(hapd->wps->registrar, any ? NULL : u,
(const u8 *) pin, os_strlen(pin));
}
int hostapd_wps_button_pushed(struct hostapd_data *hapd)
{
if (hapd->wps == NULL)
return -1;
return wps_registrar_button_pushed(hapd->wps->registrar);
}
void hostapd_wps_probe_req_rx(struct hostapd_data *hapd, const u8 *addr,
const u8 *ie, size_t ie_len)
{
struct wpabuf *wps_ie;
const u8 *end, *pos, *wps;
if (hapd->wps == NULL)
return;
pos = ie;
end = ie + ie_len;
wps = NULL;
while (pos + 1 < end) {
if (pos + 2 + pos[1] > end)
return;
if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
WPA_GET_BE32(&pos[2]) == WPS_DEV_OUI_WFA) {
wps = pos;
break;
}
pos += 2 + pos[1];
}
if (wps == NULL)
return; /* No WPS IE in Probe Request */
wps_ie = wpabuf_alloc(ie_len);
if (wps_ie == NULL)
return;
/* There may be multiple WPS IEs in the message, so need to concatenate
* their WPS Data fields */
while (pos + 1 < end) {
if (pos + 2 + pos[1] > end)
break;
if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
WPA_GET_BE32(&pos[2]) == WPS_DEV_OUI_WFA)
wpabuf_put_data(wps_ie, pos + 6, pos[1] - 4);
pos += 2 + pos[1];
}
if (wpabuf_len(wps_ie) > 0)
wps_registrar_probe_req_rx(hapd->wps->registrar, addr, wps_ie);
wpabuf_free(wps_ie);
}