--- /dev/null
+/*
+ * hostapd - PeerKey for Direct Link Setup (DLS)
+ * Copyright (c) 2006-2009, 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 "utils/includes.h"
+
+#include "utils/common.h"
+#include "utils/eloop.h"
+#include "crypto/sha1.h"
+#include "crypto/sha256.h"
+#include "wpa_auth.h"
+#include "wpa_auth_i.h"
+#include "wpa_auth_ie.h"
+
+#ifdef CONFIG_PEERKEY
+
+static void wpa_stsl_step(void *eloop_ctx, void *timeout_ctx)
+{
+#if 0
+ struct wpa_authenticator *wpa_auth = eloop_ctx;
+ struct wpa_stsl_negotiation *neg = timeout_ctx;
+#endif
+
+ /* TODO: ? */
+}
+
+
+struct wpa_stsl_search {
+ const u8 *addr;
+ struct wpa_state_machine *sm;
+};
+
+
+static int wpa_stsl_select_sta(struct wpa_state_machine *sm, void *ctx)
+{
+ struct wpa_stsl_search *search = ctx;
+ if (os_memcmp(search->addr, sm->addr, ETH_ALEN) == 0) {
+ search->sm = sm;
+ return 1;
+ }
+ return 0;
+}
+
+
+static void wpa_smk_send_error(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm, const u8 *peer,
+ u16 mui, u16 error_type)
+{
+ u8 kde[2 + RSN_SELECTOR_LEN + ETH_ALEN +
+ 2 + RSN_SELECTOR_LEN + sizeof(struct rsn_error_kde)];
+ u8 *pos;
+ struct rsn_error_kde error;
+
+ wpa_auth_logger(wpa_auth, sm->addr, LOGGER_DEBUG,
+ "Sending SMK Error");
+
+ pos = kde;
+
+ if (peer) {
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN,
+ NULL, 0);
+ }
+
+ error.mui = host_to_be16(mui);
+ error.error_type = host_to_be16(error_type);
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_ERROR,
+ (u8 *) &error, sizeof(error), NULL, 0);
+
+ __wpa_send_eapol(wpa_auth, sm,
+ WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
+ WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_ERROR,
+ NULL, NULL, kde, pos - kde, 0, 0, 0);
+}
+
+
+void wpa_smk_m1(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm, struct wpa_eapol_key *key)
+{
+ struct wpa_eapol_ie_parse kde;
+ struct wpa_stsl_search search;
+ u8 *buf, *pos;
+ size_t buf_len;
+
+ if (wpa_parse_kde_ies((const u8 *) (key + 1),
+ WPA_GET_BE16(key->key_data_length), &kde) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M1");
+ return;
+ }
+
+ if (kde.rsn_ie == NULL || kde.mac_addr == NULL ||
+ kde.mac_addr_len < ETH_ALEN) {
+ wpa_printf(MSG_INFO, "RSN: No RSN IE or MAC address KDE in "
+ "SMK M1");
+ return;
+ }
+
+ /* Initiator = sm->addr; Peer = kde.mac_addr */
+
+ search.addr = kde.mac_addr;
+ search.sm = NULL;
+ if (wpa_auth_for_each_sta(wpa_auth, wpa_stsl_select_sta, &search) ==
+ 0 || search.sm == NULL) {
+ wpa_printf(MSG_DEBUG, "RSN: SMK handshake with " MACSTR
+ " aborted - STA not associated anymore",
+ MAC2STR(kde.mac_addr));
+ wpa_smk_send_error(wpa_auth, sm, kde.mac_addr, STK_MUI_SMK,
+ STK_ERR_STA_NR);
+ /* FIX: wpa_stsl_remove(wpa_auth, neg); */
+ return;
+ }
+
+ buf_len = kde.rsn_ie_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
+ buf = os_malloc(buf_len);
+ if (buf == NULL)
+ return;
+ /* Initiator RSN IE */
+ os_memcpy(buf, kde.rsn_ie, kde.rsn_ie_len);
+ pos = buf + kde.rsn_ie_len;
+ /* Initiator MAC Address */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, sm->addr, ETH_ALEN,
+ NULL, 0);
+
+ /* SMK M2:
+ * EAPOL-Key(S=1, M=1, A=1, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
+ * MIC=MIC, DataKDs=(RSNIE_I, MAC_I KDE)
+ */
+
+ wpa_auth_logger(wpa_auth, search.sm->addr, LOGGER_DEBUG,
+ "Sending SMK M2");
+
+ __wpa_send_eapol(wpa_auth, search.sm,
+ WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
+ WPA_KEY_INFO_ACK | WPA_KEY_INFO_SMK_MESSAGE,
+ NULL, key->key_nonce, buf, pos - buf, 0, 0, 0);
+
+ os_free(buf);
+}
+
+
+static void wpa_send_smk_m4(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm,
+ struct wpa_eapol_key *key,
+ struct wpa_eapol_ie_parse *kde,
+ const u8 *smk)
+{
+ u8 *buf, *pos;
+ size_t buf_len;
+ u32 lifetime;
+
+ /* SMK M4:
+ * EAPOL-Key(S=1, M=1, A=0, I=1, K=0, SM=1, KeyRSC=0, Nonce=PNonce,
+ * MIC=MIC, DataKDs=(MAC_I KDE, INonce KDE, SMK KDE,
+ * Lifetime KDE)
+ */
+
+ buf_len = 2 + RSN_SELECTOR_LEN + ETH_ALEN +
+ 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN +
+ 2 + RSN_SELECTOR_LEN + PMK_LEN + WPA_NONCE_LEN +
+ 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
+ pos = buf = os_malloc(buf_len);
+ if (buf == NULL)
+ return;
+
+ /* Initiator MAC Address */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, kde->mac_addr, ETH_ALEN,
+ NULL, 0);
+
+ /* Initiator Nonce */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_NONCE, kde->nonce, WPA_NONCE_LEN,
+ NULL, 0);
+
+ /* SMK with PNonce */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_SMK, smk, PMK_LEN,
+ key->key_nonce, WPA_NONCE_LEN);
+
+ /* Lifetime */
+ lifetime = htonl(43200); /* dot11RSNAConfigSMKLifetime */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
+ (u8 *) &lifetime, sizeof(lifetime), NULL, 0);
+
+ wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
+ "Sending SMK M4");
+
+ __wpa_send_eapol(wpa_auth, sm,
+ WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
+ WPA_KEY_INFO_INSTALL | WPA_KEY_INFO_SMK_MESSAGE,
+ NULL, key->key_nonce, buf, pos - buf, 0, 1, 0);
+
+ os_free(buf);
+}
+
+
+static void wpa_send_smk_m5(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm,
+ struct wpa_eapol_key *key,
+ struct wpa_eapol_ie_parse *kde,
+ const u8 *smk, const u8 *peer)
+{
+ u8 *buf, *pos;
+ size_t buf_len;
+ u32 lifetime;
+
+ /* SMK M5:
+ * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
+ * MIC=MIC, DataKDs=(RSNIE_P, MAC_P KDE, PNonce, SMK KDE,
+ * Lifetime KDE))
+ */
+
+ buf_len = kde->rsn_ie_len +
+ 2 + RSN_SELECTOR_LEN + ETH_ALEN +
+ 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN +
+ 2 + RSN_SELECTOR_LEN + PMK_LEN + WPA_NONCE_LEN +
+ 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
+ pos = buf = os_malloc(buf_len);
+ if (buf == NULL)
+ return;
+
+ /* Peer RSN IE */
+ os_memcpy(buf, kde->rsn_ie, kde->rsn_ie_len);
+ pos = buf + kde->rsn_ie_len;
+
+ /* Peer MAC Address */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN, NULL, 0);
+
+ /* PNonce */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_NONCE, key->key_nonce,
+ WPA_NONCE_LEN, NULL, 0);
+
+ /* SMK and INonce */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_SMK, smk, PMK_LEN,
+ kde->nonce, WPA_NONCE_LEN);
+
+ /* Lifetime */
+ lifetime = htonl(43200); /* dot11RSNAConfigSMKLifetime */
+ pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
+ (u8 *) &lifetime, sizeof(lifetime), NULL, 0);
+
+ wpa_auth_logger(sm->wpa_auth, sm->addr, LOGGER_DEBUG,
+ "Sending SMK M5");
+
+ __wpa_send_eapol(wpa_auth, sm,
+ WPA_KEY_INFO_SECURE | WPA_KEY_INFO_MIC |
+ WPA_KEY_INFO_SMK_MESSAGE,
+ NULL, kde->nonce, buf, pos - buf, 0, 1, 0);
+
+ os_free(buf);
+}
+
+
+void wpa_smk_m3(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm, struct wpa_eapol_key *key)
+{
+ struct wpa_eapol_ie_parse kde;
+ struct wpa_stsl_search search;
+ u8 smk[32], buf[ETH_ALEN + 8 + 2 * WPA_NONCE_LEN], *pos;
+
+ if (wpa_parse_kde_ies((const u8 *) (key + 1),
+ WPA_GET_BE16(key->key_data_length), &kde) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M3");
+ return;
+ }
+
+ if (kde.rsn_ie == NULL ||
+ kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
+ kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN) {
+ wpa_printf(MSG_INFO, "RSN: No RSN IE, MAC address KDE, or "
+ "Nonce KDE in SMK M3");
+ return;
+ }
+
+ /* Peer = sm->addr; Initiator = kde.mac_addr;
+ * Peer Nonce = key->key_nonce; Initiator Nonce = kde.nonce */
+
+ search.addr = kde.mac_addr;
+ search.sm = NULL;
+ if (wpa_auth_for_each_sta(wpa_auth, wpa_stsl_select_sta, &search) ==
+ 0 || search.sm == NULL) {
+ wpa_printf(MSG_DEBUG, "RSN: SMK handshake with " MACSTR
+ " aborted - STA not associated anymore",
+ MAC2STR(kde.mac_addr));
+ wpa_smk_send_error(wpa_auth, sm, kde.mac_addr, STK_MUI_SMK,
+ STK_ERR_STA_NR);
+ /* FIX: wpa_stsl_remove(wpa_auth, neg); */
+ return;
+ }
+
+ if (os_get_random(smk, PMK_LEN)) {
+ wpa_printf(MSG_DEBUG, "RSN: Failed to generate SMK");
+ return;
+ }
+
+ /* SMK = PRF-256(Random number, "SMK Derivation",
+ * AA || Time || INonce || PNonce)
+ */
+ os_memcpy(buf, wpa_auth->addr, ETH_ALEN);
+ pos = buf + ETH_ALEN;
+ wpa_get_ntp_timestamp(pos);
+ pos += 8;
+ os_memcpy(pos, kde.nonce, WPA_NONCE_LEN);
+ pos += WPA_NONCE_LEN;
+ os_memcpy(pos, key->key_nonce, WPA_NONCE_LEN);
+#ifdef CONFIG_IEEE80211W
+ sha256_prf(smk, PMK_LEN, "SMK Derivation", buf, sizeof(buf),
+ smk, PMK_LEN);
+#else /* CONFIG_IEEE80211W */
+ sha1_prf(smk, PMK_LEN, "SMK Derivation", buf, sizeof(buf),
+ smk, PMK_LEN);
+#endif /* CONFIG_IEEE80211W */
+
+ wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", smk, PMK_LEN);
+
+ wpa_send_smk_m4(wpa_auth, sm, key, &kde, smk);
+ wpa_send_smk_m5(wpa_auth, search.sm, key, &kde, smk, sm->addr);
+
+ /* Authenticator does not need SMK anymore and it is required to forget
+ * it. */
+ os_memset(smk, 0, sizeof(*smk));
+}
+
+
+void wpa_smk_error(struct wpa_authenticator *wpa_auth,
+ struct wpa_state_machine *sm, struct wpa_eapol_key *key)
+{
+ struct wpa_eapol_ie_parse kde;
+ struct wpa_stsl_search search;
+ struct rsn_error_kde error;
+ u16 mui, error_type;
+
+ if (wpa_parse_kde_ies((const u8 *) (key + 1),
+ WPA_GET_BE16(key->key_data_length), &kde) < 0) {
+ wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error");
+ return;
+ }
+
+ if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
+ kde.error == NULL || kde.error_len < sizeof(error)) {
+ wpa_printf(MSG_INFO, "RSN: No MAC address or Error KDE in "
+ "SMK Error");
+ return;
+ }
+
+ search.addr = kde.mac_addr;
+ search.sm = NULL;
+ if (wpa_auth_for_each_sta(wpa_auth, wpa_stsl_select_sta, &search) ==
+ 0 || search.sm == NULL) {
+ wpa_printf(MSG_DEBUG, "RSN: Peer STA " MACSTR " not "
+ "associated for SMK Error message from " MACSTR,
+ MAC2STR(kde.mac_addr), MAC2STR(sm->addr));
+ return;
+ }
+
+ os_memcpy(&error, kde.error, sizeof(error));
+ mui = be_to_host16(error.mui);
+ error_type = be_to_host16(error.error_type);
+ wpa_auth_vlogger(wpa_auth, sm->addr, LOGGER_INFO,
+ "STA reported SMK Error: Peer " MACSTR
+ " MUI %d Error Type %d",
+ MAC2STR(kde.mac_addr), mui, error_type);
+
+ wpa_smk_send_error(wpa_auth, search.sm, sm->addr, mui, error_type);
+}
+
+
+int wpa_stsl_remove(struct wpa_authenticator *wpa_auth,
+ struct wpa_stsl_negotiation *neg)
+{
+ struct wpa_stsl_negotiation *pos, *prev;
+
+ if (wpa_auth == NULL)
+ return -1;
+ pos = wpa_auth->stsl_negotiations;
+ prev = NULL;
+ while (pos) {
+ if (pos == neg) {
+ if (prev)
+ prev->next = pos->next;
+ else
+ wpa_auth->stsl_negotiations = pos->next;
+
+ eloop_cancel_timeout(wpa_stsl_step, wpa_auth, pos);
+ os_free(pos);
+ return 0;
+ }
+ prev = pos;
+ pos = pos->next;
+ }
+
+ return -1;
+}
+
+#endif /* CONFIG_PEERKEY */
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