--- /dev/null
+/*
+ * hostapd - Authenticator for IEEE 802.11i RSN pre-authentication
+ * Copyright (c) 2004-2007, 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"
+
+#ifdef CONFIG_RSN_PREAUTH
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "l2_packet/l2_packet.h"
+#include "common/wpa_common.h"
+#include "eapol_auth/eapol_auth_sm.h"
+#include "eapol_auth/eapol_auth_sm_i.h"
+#include "hostapd.h"
+#include "ap_config.h"
+#include "ieee802_1x.h"
+#include "sta_info.h"
+#include "wpa_auth.h"
+#include "preauth_auth.h"
+
+#ifndef ETH_P_PREAUTH
+#define ETH_P_PREAUTH 0x88C7 /* IEEE 802.11i pre-authentication */
+#endif /* ETH_P_PREAUTH */
+
+static const int dot11RSNAConfigPMKLifetime = 43200;
+
+struct rsn_preauth_interface {
+ struct rsn_preauth_interface *next;
+ struct hostapd_data *hapd;
+ struct l2_packet_data *l2;
+ char *ifname;
+ int ifindex;
+};
+
+
+static void rsn_preauth_receive(void *ctx, const u8 *src_addr,
+ const u8 *buf, size_t len)
+{
+ struct rsn_preauth_interface *piface = ctx;
+ struct hostapd_data *hapd = piface->hapd;
+ struct ieee802_1x_hdr *hdr;
+ struct sta_info *sta;
+ struct l2_ethhdr *ethhdr;
+
+ wpa_printf(MSG_DEBUG, "RSN: receive pre-auth packet "
+ "from interface '%s'", piface->ifname);
+ if (len < sizeof(*ethhdr) + sizeof(*hdr)) {
+ wpa_printf(MSG_DEBUG, "RSN: too short pre-auth packet "
+ "(len=%lu)", (unsigned long) len);
+ return;
+ }
+
+ ethhdr = (struct l2_ethhdr *) buf;
+ hdr = (struct ieee802_1x_hdr *) (ethhdr + 1);
+
+ if (os_memcmp(ethhdr->h_dest, hapd->own_addr, ETH_ALEN) != 0) {
+ wpa_printf(MSG_DEBUG, "RSN: pre-auth for foreign address "
+ MACSTR, MAC2STR(ethhdr->h_dest));
+ return;
+ }
+
+ sta = ap_get_sta(hapd, ethhdr->h_source);
+ if (sta && (sta->flags & WLAN_STA_ASSOC)) {
+ wpa_printf(MSG_DEBUG, "RSN: pre-auth for already association "
+ "STA " MACSTR, MAC2STR(sta->addr));
+ return;
+ }
+ if (!sta && hdr->type == IEEE802_1X_TYPE_EAPOL_START) {
+ sta = ap_sta_add(hapd, ethhdr->h_source);
+ if (sta == NULL)
+ return;
+ sta->flags = WLAN_STA_PREAUTH;
+
+ ieee802_1x_new_station(hapd, sta);
+ if (sta->eapol_sm == NULL) {
+ ap_free_sta(hapd, sta);
+ sta = NULL;
+ } else {
+ sta->eapol_sm->radius_identifier = -1;
+ sta->eapol_sm->portValid = TRUE;
+ sta->eapol_sm->flags |= EAPOL_SM_PREAUTH;
+ }
+ }
+ if (sta == NULL)
+ return;
+ sta->preauth_iface = piface;
+ ieee802_1x_receive(hapd, ethhdr->h_source, (u8 *) (ethhdr + 1),
+ len - sizeof(*ethhdr));
+}
+
+
+static int rsn_preauth_iface_add(struct hostapd_data *hapd, const char *ifname)
+{
+ struct rsn_preauth_interface *piface;
+
+ wpa_printf(MSG_DEBUG, "RSN pre-auth interface '%s'", ifname);
+
+ piface = os_zalloc(sizeof(*piface));
+ if (piface == NULL)
+ return -1;
+ piface->hapd = hapd;
+
+ piface->ifname = os_strdup(ifname);
+ if (piface->ifname == NULL) {
+ goto fail1;
+ }
+
+ piface->l2 = l2_packet_init(piface->ifname, NULL, ETH_P_PREAUTH,
+ rsn_preauth_receive, piface, 1);
+ if (piface->l2 == NULL) {
+ wpa_printf(MSG_ERROR, "Failed to open register layer 2 access "
+ "to ETH_P_PREAUTH");
+ goto fail2;
+ }
+
+ piface->next = hapd->preauth_iface;
+ hapd->preauth_iface = piface;
+ return 0;
+
+fail2:
+ os_free(piface->ifname);
+fail1:
+ os_free(piface);
+ return -1;
+}
+
+
+void rsn_preauth_iface_deinit(struct hostapd_data *hapd)
+{
+ struct rsn_preauth_interface *piface, *prev;
+
+ piface = hapd->preauth_iface;
+ hapd->preauth_iface = NULL;
+ while (piface) {
+ prev = piface;
+ piface = piface->next;
+ l2_packet_deinit(prev->l2);
+ os_free(prev->ifname);
+ os_free(prev);
+ }
+}
+
+
+int rsn_preauth_iface_init(struct hostapd_data *hapd)
+{
+ char *tmp, *start, *end;
+
+ if (hapd->conf->rsn_preauth_interfaces == NULL)
+ return 0;
+
+ tmp = os_strdup(hapd->conf->rsn_preauth_interfaces);
+ if (tmp == NULL)
+ return -1;
+ start = tmp;
+ for (;;) {
+ while (*start == ' ')
+ start++;
+ if (*start == '\0')
+ break;
+ end = os_strchr(start, ' ');
+ if (end)
+ *end = '\0';
+
+ if (rsn_preauth_iface_add(hapd, start)) {
+ rsn_preauth_iface_deinit(hapd);
+ os_free(tmp);
+ return -1;
+ }
+
+ if (end)
+ start = end + 1;
+ else
+ break;
+ }
+ os_free(tmp);
+ return 0;
+}
+
+
+static void rsn_preauth_finished_cb(void *eloop_ctx, void *timeout_ctx)
+{
+ struct hostapd_data *hapd = eloop_ctx;
+ struct sta_info *sta = timeout_ctx;
+ wpa_printf(MSG_DEBUG, "RSN: Removing pre-authentication STA entry for "
+ MACSTR, MAC2STR(sta->addr));
+ ap_free_sta(hapd, sta);
+}
+
+
+void rsn_preauth_finished(struct hostapd_data *hapd, struct sta_info *sta,
+ int success)
+{
+ const u8 *key;
+ size_t len;
+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
+ HOSTAPD_LEVEL_INFO, "pre-authentication %s",
+ success ? "succeeded" : "failed");
+
+ key = ieee802_1x_get_key(sta->eapol_sm, &len);
+ if (len > PMK_LEN)
+ len = PMK_LEN;
+ if (success && key) {
+ if (wpa_auth_pmksa_add_preauth(hapd->wpa_auth, key, len,
+ sta->addr,
+ dot11RSNAConfigPMKLifetime,
+ sta->eapol_sm) == 0) {
+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
+ HOSTAPD_LEVEL_DEBUG,
+ "added PMKSA cache entry (pre-auth)");
+ } else {
+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_WPA,
+ HOSTAPD_LEVEL_DEBUG,
+ "failed to add PMKSA cache entry "
+ "(pre-auth)");
+ }
+ }
+
+ /*
+ * Finish STA entry removal from timeout in order to avoid freeing
+ * STA data before the caller has finished processing.
+ */
+ eloop_register_timeout(0, 0, rsn_preauth_finished_cb, hapd, sta);
+}
+
+
+void rsn_preauth_send(struct hostapd_data *hapd, struct sta_info *sta,
+ u8 *buf, size_t len)
+{
+ struct rsn_preauth_interface *piface;
+ struct l2_ethhdr *ethhdr;
+
+ piface = hapd->preauth_iface;
+ while (piface) {
+ if (piface == sta->preauth_iface)
+ break;
+ piface = piface->next;
+ }
+
+ if (piface == NULL) {
+ wpa_printf(MSG_DEBUG, "RSN: Could not find pre-authentication "
+ "interface for " MACSTR, MAC2STR(sta->addr));
+ return;
+ }
+
+ ethhdr = os_malloc(sizeof(*ethhdr) + len);
+ if (ethhdr == NULL)
+ return;
+
+ os_memcpy(ethhdr->h_dest, sta->addr, ETH_ALEN);
+ os_memcpy(ethhdr->h_source, hapd->own_addr, ETH_ALEN);
+ ethhdr->h_proto = host_to_be16(ETH_P_PREAUTH);
+ os_memcpy(ethhdr + 1, buf, len);
+
+ if (l2_packet_send(piface->l2, sta->addr, ETH_P_PREAUTH, (u8 *) ethhdr,
+ sizeof(*ethhdr) + len) < 0) {
+ wpa_printf(MSG_ERROR, "Failed to send preauth packet using "
+ "l2_packet_send\n");
+ }
+ os_free(ethhdr);
+}
+
+
+void rsn_preauth_free_station(struct hostapd_data *hapd, struct sta_info *sta)
+{
+ eloop_cancel_timeout(rsn_preauth_finished_cb, hapd, sta);
+}
+
+#endif /* CONFIG_RSN_PREAUTH */
projects / mech_eap.git / blobdiff