2 * hostapd - Authenticator for IEEE 802.11i RSN pre-authentication
3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
15 #include "utils/includes.h"
17 #ifdef CONFIG_RSN_PREAUTH
19 #include "utils/common.h"
20 #include "utils/eloop.h"
21 #include "l2_packet/l2_packet.h"
22 #include "common/wpa_common.h"
23 #include "eapol_auth/eapol_auth_sm.h"
24 #include "eapol_auth/eapol_auth_sm_i.h"
26 #include "ap_config.h"
27 #include "ieee802_1x.h"
30 #include "preauth_auth.h"
33 #define ETH_P_PREAUTH 0x88C7 /* IEEE 802.11i pre-authentication */
34 #endif /* ETH_P_PREAUTH */
36 static const int dot11RSNAConfigPMKLifetime = 43200;
38 struct rsn_preauth_interface {
39 struct rsn_preauth_interface *next;
40 struct hostapd_data *hapd;
41 struct l2_packet_data *l2;
47 static void rsn_preauth_receive(void *ctx, const u8 *src_addr,
48 const u8 *buf, size_t len)
50 struct rsn_preauth_interface *piface = ctx;
51 struct hostapd_data *hapd = piface->hapd;
52 struct ieee802_1x_hdr *hdr;
54 struct l2_ethhdr *ethhdr;
56 wpa_printf(MSG_DEBUG, "RSN: receive pre-auth packet "
57 "from interface '%s'", piface->ifname);
58 if (len < sizeof(*ethhdr) + sizeof(*hdr)) {
59 wpa_printf(MSG_DEBUG, "RSN: too short pre-auth packet "
60 "(len=%lu)", (unsigned long) len);
64 ethhdr = (struct l2_ethhdr *) buf;
65 hdr = (struct ieee802_1x_hdr *) (ethhdr + 1);
67 if (os_memcmp(ethhdr->h_dest, hapd->own_addr, ETH_ALEN) != 0) {
68 wpa_printf(MSG_DEBUG, "RSN: pre-auth for foreign address "
69 MACSTR, MAC2STR(ethhdr->h_dest));
73 sta = ap_get_sta(hapd, ethhdr->h_source);
74 if (sta && (sta->flags & WLAN_STA_ASSOC)) {
75 wpa_printf(MSG_DEBUG, "RSN: pre-auth for already association "
76 "STA " MACSTR, MAC2STR(sta->addr));
79 if (!sta && hdr->type == IEEE802_1X_TYPE_EAPOL_START) {
80 sta = ap_sta_add(hapd, ethhdr->h_source);
83 sta->flags = WLAN_STA_PREAUTH;
85 ieee802_1x_new_station(hapd, sta);
86 if (sta->eapol_sm == NULL) {
87 ap_free_sta(hapd, sta);
90 sta->eapol_sm->radius_identifier = -1;
91 sta->eapol_sm->portValid = TRUE;
92 sta->eapol_sm->flags |= EAPOL_SM_PREAUTH;
97 sta->preauth_iface = piface;
98 ieee802_1x_receive(hapd, ethhdr->h_source, (u8 *) (ethhdr + 1),
99 len - sizeof(*ethhdr));
103 static int rsn_preauth_iface_add(struct hostapd_data *hapd, const char *ifname)
105 struct rsn_preauth_interface *piface;
107 wpa_printf(MSG_DEBUG, "RSN pre-auth interface '%s'", ifname);
109 piface = os_zalloc(sizeof(*piface));
114 piface->ifname = os_strdup(ifname);
115 if (piface->ifname == NULL) {
119 piface->l2 = l2_packet_init(piface->ifname, NULL, ETH_P_PREAUTH,
120 rsn_preauth_receive, piface, 1);
121 if (piface->l2 == NULL) {
122 wpa_printf(MSG_ERROR, "Failed to open register layer 2 access "
127 piface->next = hapd->preauth_iface;
128 hapd->preauth_iface = piface;
132 os_free(piface->ifname);
139 void rsn_preauth_iface_deinit(struct hostapd_data *hapd)
141 struct rsn_preauth_interface *piface, *prev;
143 piface = hapd->preauth_iface;
144 hapd->preauth_iface = NULL;
147 piface = piface->next;
148 l2_packet_deinit(prev->l2);
149 os_free(prev->ifname);
155 int rsn_preauth_iface_init(struct hostapd_data *hapd)
157 char *tmp, *start, *end;
159 if (hapd->conf->rsn_preauth_interfaces == NULL)
162 tmp = os_strdup(hapd->conf->rsn_preauth_interfaces);
167 while (*start == ' ')
171 end = os_strchr(start, ' ');
175 if (rsn_preauth_iface_add(hapd, start)) {
176 rsn_preauth_iface_deinit(hapd);
191 static void rsn_preauth_finished_cb(void *eloop_ctx, void *timeout_ctx)
193 struct hostapd_data *hapd = eloop_ctx;
194 struct sta_info *sta = timeout_ctx;
195 wpa_printf(MSG_DEBUG, "RSN: Removing pre-authentication STA entry for "
196 MACSTR, MAC2STR(sta->addr));
197 ap_free_sta(hapd, sta);
201 void rsn_preauth_finished(struct hostapd_data *hapd, struct sta_info *sta,
206 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
207 HOSTAPD_LEVEL_INFO, "pre-authentication %s",
208 success ? "succeeded" : "failed");
210 key = ieee802_1x_get_key(sta->eapol_sm, &len);
213 if (success && key) {
214 if (wpa_auth_pmksa_add_preauth(hapd->wpa_auth, key, len,
216 dot11RSNAConfigPMKLifetime,
217 sta->eapol_sm) == 0) {
218 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
220 "added PMKSA cache entry (pre-auth)");
222 hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
224 "failed to add PMKSA cache entry "
230 * Finish STA entry removal from timeout in order to avoid freeing
231 * STA data before the caller has finished processing.
233 eloop_register_timeout(0, 0, rsn_preauth_finished_cb, hapd, sta);
237 void rsn_preauth_send(struct hostapd_data *hapd, struct sta_info *sta,
240 struct rsn_preauth_interface *piface;
241 struct l2_ethhdr *ethhdr;
243 piface = hapd->preauth_iface;
245 if (piface == sta->preauth_iface)
247 piface = piface->next;
250 if (piface == NULL) {
251 wpa_printf(MSG_DEBUG, "RSN: Could not find pre-authentication "
252 "interface for " MACSTR, MAC2STR(sta->addr));
256 ethhdr = os_malloc(sizeof(*ethhdr) + len);
260 os_memcpy(ethhdr->h_dest, sta->addr, ETH_ALEN);
261 os_memcpy(ethhdr->h_source, hapd->own_addr, ETH_ALEN);
262 ethhdr->h_proto = host_to_be16(ETH_P_PREAUTH);
263 os_memcpy(ethhdr + 1, buf, len);
265 if (l2_packet_send(piface->l2, sta->addr, ETH_P_PREAUTH, (u8 *) ethhdr,
266 sizeof(*ethhdr) + len) < 0) {
267 wpa_printf(MSG_ERROR, "Failed to send preauth packet using "
274 void rsn_preauth_free_station(struct hostapd_data *hapd, struct sta_info *sta)
276 eloop_cancel_timeout(rsn_preauth_finished_cb, hapd, sta);
279 #endif /* CONFIG_RSN_PREAUTH */