+++ /dev/null
-/*
- * hostapd - PeerKey for Direct Link Setup (DLS)
- * Copyright (c) 2006-2009, 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"
-
-#include "utils/common.h"
-#include "utils/eloop.h"
-#include "crypto/sha1.h"
-#include "crypto/sha256.h"
-#include "crypto/random.h"
-#include "wpa_auth.h"
-#include "wpa_auth_i.h"
-#include "wpa_auth_ie.h"
-
-#ifdef CONFIG_PEERKEY
-
-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,
- const u8 *key_data, size_t key_data_len)
-{
- struct wpa_eapol_ie_parse kde;
- struct wpa_stsl_search search;
- u8 *buf, *pos;
- size_t buf_len;
-
- if (wpa_parse_kde_ies(key_data, key_data_len, &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);
- 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(pos, kde->rsn_ie, kde->rsn_ie_len);
- pos += 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,
- const u8 *key_data, size_t key_data_len)
-{
- 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(key_data, key_data_len, &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);
- return;
- }
-
- if (random_get_bytes(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,
- const u8 *key_data, size_t key_data_len)
-{
- 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(key_data, key_data_len, &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);
-}
-
-#endif /* CONFIG_PEERKEY */
+++ /dev/null
-/*
- * WPA Supplicant - PeerKey for Direct Link Setup (DLS)
- * Copyright (c) 2006-2015, Jouni Malinen <j@w1.fi>
- *
- * This software may be distributed under the terms of the BSD license.
- * See README for more details.
- */
-
-#include "includes.h"
-
-#ifdef CONFIG_PEERKEY
-
-#include "common.h"
-#include "eloop.h"
-#include "crypto/sha1.h"
-#include "crypto/sha256.h"
-#include "crypto/random.h"
-#include "common/ieee802_11_defs.h"
-#include "wpa.h"
-#include "wpa_i.h"
-#include "wpa_ie.h"
-#include "peerkey.h"
-
-
-static u8 * wpa_add_ie(u8 *pos, const u8 *ie, size_t ie_len)
-{
- os_memcpy(pos, ie, ie_len);
- return pos + ie_len;
-}
-
-
-static u8 * wpa_add_kde(u8 *pos, u32 kde, const u8 *data, size_t data_len)
-{
- *pos++ = WLAN_EID_VENDOR_SPECIFIC;
- *pos++ = RSN_SELECTOR_LEN + data_len;
- RSN_SELECTOR_PUT(pos, kde);
- pos += RSN_SELECTOR_LEN;
- os_memcpy(pos, data, data_len);
- pos += data_len;
- return pos;
-}
-
-
-static void wpa_supplicant_smk_timeout(void *eloop_ctx, void *timeout_ctx)
-{
-#if 0
- struct wpa_sm *sm = eloop_ctx;
- struct wpa_peerkey *peerkey = timeout_ctx;
-#endif
- /* TODO: time out SMK and any STK that was generated using this SMK */
-}
-
-
-static void wpa_supplicant_peerkey_free(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey)
-{
- eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
- os_free(peerkey);
-}
-
-
-static int wpa_supplicant_send_smk_error(struct wpa_sm *sm, const u8 *dst,
- const u8 *peer,
- u16 mui, u16 error_type, int ver)
-{
- size_t rlen;
- struct wpa_eapol_key *err;
- struct rsn_error_kde error;
- u8 *rbuf, *pos, *mic;
- size_t kde_len, mic_len = 16;
- u16 key_info;
-
- kde_len = 2 + RSN_SELECTOR_LEN + sizeof(error);
- if (peer)
- kde_len += 2 + RSN_SELECTOR_LEN + ETH_ALEN;
-
- rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
- NULL, sizeof(*err) + mic_len + 2 + kde_len,
- &rlen, (void *) &err);
- if (rbuf == NULL)
- return -1;
- mic = (u8 *) (err + 1);
-
- err->type = EAPOL_KEY_TYPE_RSN;
- key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
- WPA_KEY_INFO_SECURE | WPA_KEY_INFO_ERROR |
- WPA_KEY_INFO_REQUEST;
- WPA_PUT_BE16(err->key_info, key_info);
- WPA_PUT_BE16(err->key_length, 0);
- os_memcpy(err->replay_counter, sm->request_counter,
- WPA_REPLAY_COUNTER_LEN);
- inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
-
- WPA_PUT_BE16(mic + mic_len, (u16) kde_len);
- pos = mic + mic_len + 2;
-
- if (peer) {
- /* Peer MAC Address KDE */
- pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
- }
-
- /* Error KDE */
- error.mui = host_to_be16(mui);
- error.error_type = host_to_be16(error_type);
- wpa_add_kde(pos, RSN_KEY_DATA_ERROR, (u8 *) &error, sizeof(error));
-
- if (peer) {
- wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error (peer "
- MACSTR " mui %d error_type %d)",
- MAC2STR(peer), mui, error_type);
- } else {
- wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK Error "
- "(mui %d error_type %d)", mui, error_type);
- }
-
- wpa_eapol_key_send(sm, &sm->ptk, ver, dst, ETH_P_EAPOL, rbuf, rlen,
- mic);
-
- return 0;
-}
-
-
-static int wpa_supplicant_send_smk_m3(struct wpa_sm *sm,
- const unsigned char *src_addr,
- const struct wpa_eapol_key *key,
- int ver, struct wpa_peerkey *peerkey)
-{
- size_t rlen;
- struct wpa_eapol_key *reply;
- u8 *rbuf, *pos, *mic;
- size_t kde_len, mic_len = 16;
- u16 key_info;
-
- /* KDEs: Peer RSN IE, Initiator MAC Address, Initiator Nonce */
- kde_len = peerkey->rsnie_p_len +
- 2 + RSN_SELECTOR_LEN + ETH_ALEN +
- 2 + RSN_SELECTOR_LEN + WPA_NONCE_LEN;
-
- rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY,
- NULL, sizeof(*reply) + mic_len + 2 + kde_len,
- &rlen, (void *) &reply);
- if (rbuf == NULL)
- return -1;
-
- reply->type = EAPOL_KEY_TYPE_RSN;
- key_info = ver | WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
- WPA_KEY_INFO_SECURE;
- WPA_PUT_BE16(reply->key_info, key_info);
- WPA_PUT_BE16(reply->key_length, 0);
- os_memcpy(reply->replay_counter, key->replay_counter,
- WPA_REPLAY_COUNTER_LEN);
-
- os_memcpy(reply->key_nonce, peerkey->pnonce, WPA_NONCE_LEN);
-
- mic = (u8 *) (reply + 1);
- WPA_PUT_BE16(mic + mic_len, (u16) kde_len);
- pos = mic + mic_len + 2;
-
- /* Peer RSN IE */
- pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
-
- /* Initiator MAC Address KDE */
- pos = wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peerkey->addr, ETH_ALEN);
-
- /* Initiator Nonce */
- wpa_add_kde(pos, RSN_KEY_DATA_NONCE, peerkey->inonce, WPA_NONCE_LEN);
-
- wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key SMK M3");
- wpa_eapol_key_send(sm, &sm->ptk, ver, src_addr, ETH_P_EAPOL, rbuf, rlen,
- mic);
-
- return 0;
-}
-
-
-static int wpa_supplicant_process_smk_m2(
- struct wpa_sm *sm, const unsigned char *src_addr,
- const struct wpa_eapol_key *key, const u8 *key_data,
- size_t key_data_len, int ver)
-{
- struct wpa_peerkey *peerkey;
- struct wpa_eapol_ie_parse kde;
- struct wpa_ie_data ie;
- int cipher;
- struct rsn_ie_hdr *hdr;
- u8 *pos;
-
- wpa_printf(MSG_DEBUG, "RSN: Received SMK M2");
-
- if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
- wpa_printf(MSG_INFO, "RSN: SMK handshake not allowed for "
- "the current network");
- return -1;
- }
-
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M2");
- return -1;
- }
-
- 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 M2");
- return -1;
- }
-
- wpa_printf(MSG_DEBUG, "RSN: SMK M2 - SMK initiator " MACSTR,
- MAC2STR(kde.mac_addr));
-
- if (kde.rsn_ie_len > PEERKEY_MAX_IE_LEN) {
- wpa_printf(MSG_INFO, "RSN: Too long Initiator RSN IE in SMK "
- "M2");
- return -1;
- }
-
- if (wpa_parse_wpa_ie_rsn(kde.rsn_ie, kde.rsn_ie_len, &ie) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to parse RSN IE in SMK M2");
- return -1;
- }
-
- cipher = wpa_pick_pairwise_cipher(ie.pairwise_cipher &
- sm->allowed_pairwise_cipher, 0);
- if (cipher < 0) {
- wpa_printf(MSG_INFO, "RSN: No acceptable cipher in SMK M2");
- wpa_supplicant_send_smk_error(sm, src_addr, kde.mac_addr,
- STK_MUI_SMK, STK_ERR_CPHR_NS,
- ver);
- return -1;
- }
- wpa_printf(MSG_DEBUG, "RSN: Using %s for PeerKey",
- wpa_cipher_txt(cipher));
-
- /* TODO: find existing entry and if found, use that instead of adding
- * a new one; how to handle the case where both ends initiate at the
- * same time? */
- peerkey = os_zalloc(sizeof(*peerkey));
- if (peerkey == NULL)
- return -1;
- os_memcpy(peerkey->addr, kde.mac_addr, ETH_ALEN);
- os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
- os_memcpy(peerkey->rsnie_i, kde.rsn_ie, kde.rsn_ie_len);
- peerkey->rsnie_i_len = kde.rsn_ie_len;
- peerkey->cipher = cipher;
- peerkey->akmp = ie.key_mgmt;
-
- if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
- "WPA: Failed to get random data for PNonce");
- wpa_supplicant_peerkey_free(sm, peerkey);
- return -1;
- }
-
- hdr = (struct rsn_ie_hdr *) peerkey->rsnie_p;
- hdr->elem_id = WLAN_EID_RSN;
- WPA_PUT_LE16(hdr->version, RSN_VERSION);
- pos = (u8 *) (hdr + 1);
- /* Group Suite can be anything for SMK RSN IE; receiver will just
- * ignore it. */
- RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
- pos += RSN_SELECTOR_LEN;
- /* Include only the selected cipher in pairwise cipher suite */
- WPA_PUT_LE16(pos, 1);
- pos += 2;
- RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, cipher));
- pos += RSN_SELECTOR_LEN;
-
- hdr->len = (pos - peerkey->rsnie_p) - 2;
- peerkey->rsnie_p_len = pos - peerkey->rsnie_p;
- wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
- peerkey->rsnie_p, peerkey->rsnie_p_len);
-
- wpa_supplicant_send_smk_m3(sm, src_addr, key, ver, peerkey);
-
- peerkey->next = sm->peerkey;
- sm->peerkey = peerkey;
-
- return 0;
-}
-
-
-/**
- * rsn_smkid - Derive SMK identifier
- * @smk: Station master key (32 bytes)
- * @pnonce: Peer Nonce
- * @mac_p: Peer MAC address
- * @inonce: Initiator Nonce
- * @mac_i: Initiator MAC address
- * @akmp: Negotiated AKM
- *
- * 8.5.1.4 Station to station (STK) key hierarchy
- * SMKID = HMAC-SHA1-128(SMK, "SMK Name" || PNonce || MAC_P || INonce || MAC_I)
- */
-static void rsn_smkid(const u8 *smk, const u8 *pnonce, const u8 *mac_p,
- const u8 *inonce, const u8 *mac_i, u8 *smkid,
- int akmp)
-{
- char *title = "SMK Name";
- const u8 *addr[5];
- const size_t len[5] = { 8, WPA_NONCE_LEN, ETH_ALEN, WPA_NONCE_LEN,
- ETH_ALEN };
- unsigned char hash[SHA256_MAC_LEN];
-
- addr[0] = (u8 *) title;
- addr[1] = pnonce;
- addr[2] = mac_p;
- addr[3] = inonce;
- addr[4] = mac_i;
-
-#ifdef CONFIG_IEEE80211W
- if (wpa_key_mgmt_sha256(akmp))
- hmac_sha256_vector(smk, PMK_LEN, 5, addr, len, hash);
- else
-#endif /* CONFIG_IEEE80211W */
- hmac_sha1_vector(smk, PMK_LEN, 5, addr, len, hash);
- os_memcpy(smkid, hash, PMKID_LEN);
-}
-
-
-static void wpa_supplicant_send_stk_1_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey)
-{
- size_t mlen;
- struct wpa_eapol_key *msg;
- u8 *mbuf, *mic;
- size_t kde_len, mic_len = 16;
- u16 key_info, ver;
-
- kde_len = 2 + RSN_SELECTOR_LEN + PMKID_LEN;
-
- mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
- sizeof(*msg) + mic_len + 2 + kde_len, &mlen,
- (void *) &msg);
- if (mbuf == NULL)
- return;
-
- mic = (u8 *) (msg + 1);
- msg->type = EAPOL_KEY_TYPE_RSN;
-
- if (peerkey->cipher != WPA_CIPHER_TKIP)
- ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
- else
- ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
-
- key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK;
- WPA_PUT_BE16(msg->key_info, key_info);
-
- if (peerkey->cipher != WPA_CIPHER_TKIP)
- WPA_PUT_BE16(msg->key_length, 16);
- else
- WPA_PUT_BE16(msg->key_length, 32);
-
- os_memcpy(msg->replay_counter, peerkey->replay_counter,
- WPA_REPLAY_COUNTER_LEN);
- inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
-
- WPA_PUT_BE16(mic + mic_len, kde_len);
- wpa_add_kde(mic + mic_len + 2, RSN_KEY_DATA_PMKID,
- peerkey->smkid, PMKID_LEN);
-
- if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
- "RSN: Failed to get random data for INonce (STK)");
- os_free(mbuf);
- return;
- }
- wpa_hexdump(MSG_DEBUG, "RSN: INonce for STK 4-Way Handshake",
- peerkey->inonce, WPA_NONCE_LEN);
- os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
-
- wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 1/4 to " MACSTR,
- MAC2STR(peerkey->addr));
- wpa_eapol_key_send(sm, NULL, ver, peerkey->addr, ETH_P_EAPOL,
- mbuf, mlen, NULL);
-}
-
-
-static void wpa_supplicant_send_stk_3_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey)
-{
- size_t mlen;
- struct wpa_eapol_key *msg;
- u8 *mbuf, *pos, *mic;
- size_t kde_len, mic_len = 16;
- u16 key_info, ver;
- be32 lifetime;
-
- kde_len = peerkey->rsnie_i_len +
- 2 + RSN_SELECTOR_LEN + sizeof(lifetime);
-
- mbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
- sizeof(*msg) + mic_len + 2 + kde_len, &mlen,
- (void *) &msg);
- if (mbuf == NULL)
- return;
-
- mic = (u8 *) (msg + 1);
- msg->type = EAPOL_KEY_TYPE_RSN;
-
- if (peerkey->cipher != WPA_CIPHER_TKIP)
- ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
- else
- ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
-
- key_info = ver | WPA_KEY_INFO_KEY_TYPE | WPA_KEY_INFO_ACK |
- WPA_KEY_INFO_MIC | WPA_KEY_INFO_SECURE;
- WPA_PUT_BE16(msg->key_info, key_info);
-
- if (peerkey->cipher != WPA_CIPHER_TKIP)
- WPA_PUT_BE16(msg->key_length, 16);
- else
- WPA_PUT_BE16(msg->key_length, 32);
-
- os_memcpy(msg->replay_counter, peerkey->replay_counter,
- WPA_REPLAY_COUNTER_LEN);
- inc_byte_array(peerkey->replay_counter, WPA_REPLAY_COUNTER_LEN);
-
- WPA_PUT_BE16(mic + mic_len, kde_len);
- pos = mic + mic_len + 2;
- pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
- lifetime = host_to_be32(peerkey->lifetime);
- wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
- (u8 *) &lifetime, sizeof(lifetime));
-
- os_memcpy(msg->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
-
- wpa_printf(MSG_DEBUG, "RSN: Sending EAPOL-Key STK 3/4 to " MACSTR,
- MAC2STR(peerkey->addr));
- wpa_eapol_key_send(sm, &peerkey->stk, ver, peerkey->addr, ETH_P_EAPOL,
- mbuf, mlen, mic);
-}
-
-
-static int wpa_supplicant_process_smk_m4(struct wpa_peerkey *peerkey,
- struct wpa_eapol_ie_parse *kde)
-{
- wpa_printf(MSG_DEBUG, "RSN: Received SMK M4 (Initiator " MACSTR ")",
- MAC2STR(kde->mac_addr));
-
- if (os_memcmp(kde->smk + PMK_LEN, peerkey->pnonce, WPA_NONCE_LEN) != 0)
- {
- wpa_printf(MSG_INFO, "RSN: PNonce in SMK KDE does not "
- "match with the one used in SMK M3");
- return -1;
- }
-
- if (os_memcmp(kde->nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
- wpa_printf(MSG_INFO, "RSN: INonce in SMK M4 did not "
- "match with the one received in SMK M2");
- return -1;
- }
-
- return 0;
-}
-
-
-static int wpa_supplicant_process_smk_m5(struct wpa_sm *sm,
- const unsigned char *src_addr,
- const struct wpa_eapol_key *key,
- int ver,
- struct wpa_peerkey *peerkey,
- struct wpa_eapol_ie_parse *kde)
-{
- int cipher;
- struct wpa_ie_data ie;
-
- wpa_printf(MSG_DEBUG, "RSN: Received SMK M5 (Peer " MACSTR ")",
- MAC2STR(kde->mac_addr));
- if (kde->rsn_ie == NULL || kde->rsn_ie_len > PEERKEY_MAX_IE_LEN ||
- wpa_parse_wpa_ie_rsn(kde->rsn_ie, kde->rsn_ie_len, &ie) < 0) {
- wpa_printf(MSG_INFO, "RSN: No RSN IE in SMK M5");
- /* TODO: abort negotiation */
- return -1;
- }
-
- if (os_memcmp(key->key_nonce, peerkey->inonce, WPA_NONCE_LEN) != 0) {
- wpa_printf(MSG_INFO, "RSN: Key Nonce in SMK M5 does "
- "not match with INonce used in SMK M1");
- return -1;
- }
-
- if (os_memcmp(kde->smk + PMK_LEN, peerkey->inonce, WPA_NONCE_LEN) != 0)
- {
- wpa_printf(MSG_INFO, "RSN: INonce in SMK KDE does not "
- "match with the one used in SMK M1");
- return -1;
- }
-
- os_memcpy(peerkey->rsnie_p, kde->rsn_ie, kde->rsn_ie_len);
- peerkey->rsnie_p_len = kde->rsn_ie_len;
- os_memcpy(peerkey->pnonce, kde->nonce, WPA_NONCE_LEN);
-
- cipher = wpa_pick_pairwise_cipher(ie.pairwise_cipher &
- sm->allowed_pairwise_cipher, 0);
- if (cipher < 0) {
- wpa_printf(MSG_INFO, "RSN: SMK Peer STA " MACSTR " selected "
- "unacceptable cipher", MAC2STR(kde->mac_addr));
- wpa_supplicant_send_smk_error(sm, src_addr, kde->mac_addr,
- STK_MUI_SMK, STK_ERR_CPHR_NS,
- ver);
- /* TODO: abort negotiation */
- return -1;
- }
- wpa_printf(MSG_DEBUG, "RSN: Using %s for PeerKey",
- wpa_cipher_txt(cipher));
- peerkey->cipher = cipher;
-
- return 0;
-}
-
-
-static int wpa_supplicant_process_smk_m45(
- struct wpa_sm *sm, const unsigned char *src_addr,
- const struct wpa_eapol_key *key, const u8 *key_data,
- size_t key_data_len, int ver)
-{
- struct wpa_peerkey *peerkey;
- struct wpa_eapol_ie_parse kde;
- u32 lifetime;
-
- if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
- wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
- "the current network");
- return -1;
- }
-
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK M4/M5");
- return -1;
- }
-
- if (kde.mac_addr == NULL || kde.mac_addr_len < ETH_ALEN ||
- kde.nonce == NULL || kde.nonce_len < WPA_NONCE_LEN ||
- kde.smk == NULL || kde.smk_len < PMK_LEN + WPA_NONCE_LEN ||
- kde.lifetime == NULL || kde.lifetime_len < 4) {
- wpa_printf(MSG_INFO, "RSN: No MAC Address, Nonce, SMK, or "
- "Lifetime KDE in SMK M4/M5");
- return -1;
- }
-
- for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
- if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) == 0 &&
- os_memcmp(peerkey->initiator ? peerkey->inonce :
- peerkey->pnonce,
- key->key_nonce, WPA_NONCE_LEN) == 0)
- break;
- }
- if (peerkey == NULL) {
- wpa_printf(MSG_INFO, "RSN: No matching SMK handshake found "
- "for SMK M4/M5: peer " MACSTR,
- MAC2STR(kde.mac_addr));
- return -1;
- }
-
- if (peerkey->initiator) {
- if (wpa_supplicant_process_smk_m5(sm, src_addr, key, ver,
- peerkey, &kde) < 0)
- return -1;
- } else {
- if (wpa_supplicant_process_smk_m4(peerkey, &kde) < 0)
- return -1;
- }
-
- os_memcpy(peerkey->smk, kde.smk, PMK_LEN);
- peerkey->smk_complete = 1;
- wpa_hexdump_key(MSG_DEBUG, "RSN: SMK", peerkey->smk, PMK_LEN);
- lifetime = WPA_GET_BE32(kde.lifetime);
- wpa_printf(MSG_DEBUG, "RSN: SMK lifetime %u seconds", lifetime);
- if (lifetime > 1000000000)
- lifetime = 1000000000; /* avoid overflowing eloop time */
- peerkey->lifetime = lifetime;
- eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
- sm, peerkey);
-
- if (peerkey->initiator) {
- rsn_smkid(peerkey->smk, peerkey->pnonce, peerkey->addr,
- peerkey->inonce, sm->own_addr, peerkey->smkid,
- peerkey->akmp);
- wpa_supplicant_send_stk_1_of_4(sm, peerkey);
- } else {
- rsn_smkid(peerkey->smk, peerkey->pnonce, sm->own_addr,
- peerkey->inonce, peerkey->addr, peerkey->smkid,
- peerkey->akmp);
- }
- wpa_hexdump(MSG_DEBUG, "RSN: SMKID", peerkey->smkid, PMKID_LEN);
-
- return 0;
-}
-
-
-static int wpa_supplicant_process_smk_error(
- struct wpa_sm *sm, const unsigned char *src_addr,
- const u8 *key_data, size_t key_data_len)
-{
- struct wpa_eapol_ie_parse kde;
- struct rsn_error_kde error;
- u8 peer[ETH_ALEN];
- u16 error_type;
-
- wpa_printf(MSG_DEBUG, "RSN: Received SMK Error");
-
- if (!sm->peerkey_enabled || sm->proto != WPA_PROTO_RSN) {
- wpa_printf(MSG_DEBUG, "RSN: SMK handshake not allowed for "
- "the current network");
- return -1;
- }
-
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to parse KDEs in SMK Error");
- return -1;
- }
-
- if (kde.error == NULL || kde.error_len < sizeof(error)) {
- wpa_printf(MSG_INFO, "RSN: No Error KDE in SMK Error");
- return -1;
- }
-
- if (kde.mac_addr && kde.mac_addr_len >= ETH_ALEN)
- os_memcpy(peer, kde.mac_addr, ETH_ALEN);
- else
- os_memset(peer, 0, ETH_ALEN);
- os_memcpy(&error, kde.error, sizeof(error));
- error_type = be_to_host16(error.error_type);
- wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
- "RSN: SMK Error KDE received: MUI %d error_type %d peer "
- MACSTR,
- be_to_host16(error.mui), error_type,
- MAC2STR(peer));
-
- if (kde.mac_addr &&
- (error_type == STK_ERR_STA_NR || error_type == STK_ERR_STA_NRSN ||
- error_type == STK_ERR_CPHR_NS)) {
- struct wpa_peerkey *peerkey;
-
- for (peerkey = sm->peerkey; peerkey; peerkey = peerkey->next) {
- if (os_memcmp(peerkey->addr, kde.mac_addr, ETH_ALEN) ==
- 0)
- break;
- }
- if (peerkey == NULL) {
- wpa_printf(MSG_DEBUG, "RSN: No matching SMK handshake "
- "found for SMK Error");
- return -1;
- }
- /* TODO: abort SMK/STK handshake and remove all related keys */
- }
-
- return 0;
-}
-
-
-static void wpa_supplicant_process_stk_1_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- const struct wpa_eapol_key *key,
- u16 ver, const u8 *key_data,
- size_t key_data_len)
-{
- struct wpa_eapol_ie_parse ie;
- size_t kde_buf_len;
- struct wpa_ptk *stk;
- u8 buf[8], *kde_buf, *pos;
- be32 lifetime;
-
- wpa_printf(MSG_DEBUG, "RSN: RX message 1 of STK 4-Way Handshake from "
- MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
-
- os_memset(&ie, 0, sizeof(ie));
-
- /* RSN: msg 1/4 should contain SMKID for the selected SMK */
- wpa_hexdump(MSG_DEBUG, "RSN: msg 1/4 key data", key_data, key_data_len);
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0 ||
- ie.pmkid == NULL) {
- wpa_printf(MSG_DEBUG, "RSN: No SMKID in STK 1/4");
- return;
- }
- if (os_memcmp_const(ie.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
- wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 1/4",
- ie.pmkid, PMKID_LEN);
- return;
- }
-
- if (random_get_bytes(peerkey->pnonce, WPA_NONCE_LEN)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
- "RSN: Failed to get random data for PNonce");
- return;
- }
- wpa_hexdump(MSG_DEBUG, "WPA: Renewed PNonce",
- peerkey->pnonce, WPA_NONCE_LEN);
-
- /* Calculate STK which will be stored as a temporary STK until it has
- * been verified when processing message 3/4. */
- stk = &peerkey->tstk;
- wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
- sm->own_addr, peerkey->addr,
- peerkey->pnonce, key->key_nonce,
- stk, peerkey->akmp, peerkey->cipher);
- /* Supplicant: swap tx/rx Mic keys */
- os_memcpy(buf, &stk->tk[16], 8);
- os_memcpy(&stk->tk[16], &stk->tk[24], 8);
- os_memcpy(&stk->tk[24], buf, 8);
- peerkey->tstk_set = 1;
-
- kde_buf_len = peerkey->rsnie_p_len +
- 2 + RSN_SELECTOR_LEN + sizeof(lifetime) +
- 2 + RSN_SELECTOR_LEN + PMKID_LEN;
- kde_buf = os_malloc(kde_buf_len);
- if (kde_buf == NULL)
- return;
- pos = kde_buf;
- pos = wpa_add_ie(pos, peerkey->rsnie_p, peerkey->rsnie_p_len);
- lifetime = host_to_be32(peerkey->lifetime);
- pos = wpa_add_kde(pos, RSN_KEY_DATA_LIFETIME,
- (u8 *) &lifetime, sizeof(lifetime));
- wpa_add_kde(pos, RSN_KEY_DATA_PMKID, peerkey->smkid, PMKID_LEN);
-
- if (wpa_supplicant_send_2_of_4(sm, peerkey->addr, key, ver,
- peerkey->pnonce, kde_buf, kde_buf_len,
- stk) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to send STK message 2/4");
- os_free(kde_buf);
- return;
- }
- os_free(kde_buf);
-
- os_memcpy(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN);
-}
-
-
-static void wpa_supplicant_update_smk_lifetime(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- struct wpa_eapol_ie_parse *kde)
-{
- u32 lifetime;
-
- if (kde->lifetime == NULL || kde->lifetime_len < sizeof(lifetime))
- return;
-
- lifetime = WPA_GET_BE32(kde->lifetime);
-
- if (lifetime >= peerkey->lifetime) {
- wpa_printf(MSG_DEBUG, "RSN: Peer used SMK lifetime %u seconds "
- "which is larger than or equal to own value %u "
- "seconds - ignored", lifetime, peerkey->lifetime);
- return;
- }
-
- wpa_printf(MSG_DEBUG, "RSN: Peer used shorter SMK lifetime %u seconds "
- "(own was %u seconds) - updated",
- lifetime, peerkey->lifetime);
- peerkey->lifetime = lifetime;
-
- eloop_cancel_timeout(wpa_supplicant_smk_timeout, sm, peerkey);
- eloop_register_timeout(lifetime, 0, wpa_supplicant_smk_timeout,
- sm, peerkey);
-}
-
-
-static void wpa_supplicant_process_stk_2_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- const struct wpa_eapol_key *key,
- u16 ver, const u8 *key_data,
- size_t key_data_len)
-{
- struct wpa_eapol_ie_parse kde;
-
- wpa_printf(MSG_DEBUG, "RSN: RX message 2 of STK 4-Way Handshake from "
- MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
-
- os_memset(&kde, 0, sizeof(kde));
-
- /* RSN: msg 2/4 should contain SMKID for the selected SMK and RSN IE
- * from the peer. It may also include Lifetime KDE. */
- wpa_hexdump(MSG_DEBUG, "RSN: msg 2/4 key data", key_data, key_data_len);
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0 ||
- kde.pmkid == NULL || kde.rsn_ie == NULL) {
- wpa_printf(MSG_DEBUG, "RSN: No SMKID or RSN IE in STK 2/4");
- return;
- }
-
- if (os_memcmp_const(kde.pmkid, peerkey->smkid, PMKID_LEN) != 0) {
- wpa_hexdump(MSG_DEBUG, "RSN: Unknown SMKID in STK 2/4",
- kde.pmkid, PMKID_LEN);
- return;
- }
-
- if (kde.rsn_ie_len != peerkey->rsnie_p_len ||
- os_memcmp(kde.rsn_ie, peerkey->rsnie_p, kde.rsn_ie_len) != 0) {
- wpa_printf(MSG_INFO, "RSN: Peer RSN IE in SMK and STK "
- "handshakes did not match");
- wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in SMK handshake",
- peerkey->rsnie_p, peerkey->rsnie_p_len);
- wpa_hexdump(MSG_DEBUG, "RSN: Peer RSN IE in STK handshake",
- kde.rsn_ie, kde.rsn_ie_len);
- return;
- }
-
- wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
-
- wpa_supplicant_send_stk_3_of_4(sm, peerkey);
- os_memcpy(peerkey->pnonce, key->key_nonce, WPA_NONCE_LEN);
-}
-
-
-static void wpa_supplicant_process_stk_3_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- const struct wpa_eapol_key *key,
- u16 ver, const u8 *key_data,
- size_t key_data_len)
-{
- struct wpa_eapol_ie_parse kde;
- size_t key_len;
- const u8 *_key;
- u8 key_buf[32], rsc[6];
-
- wpa_printf(MSG_DEBUG, "RSN: RX message 3 of STK 4-Way Handshake from "
- MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
-
- os_memset(&kde, 0, sizeof(kde));
-
- /* RSN: msg 3/4 should contain Initiator RSN IE. It may also include
- * Lifetime KDE. */
- wpa_hexdump(MSG_DEBUG, "RSN: msg 3/4 key data", key_data, key_data_len);
- if (wpa_supplicant_parse_ies(key_data, key_data_len, &kde) < 0) {
- wpa_printf(MSG_DEBUG, "RSN: Failed to parse key data in "
- "STK 3/4");
- return;
- }
-
- if (kde.rsn_ie_len != peerkey->rsnie_i_len ||
- os_memcmp(kde.rsn_ie, peerkey->rsnie_i, kde.rsn_ie_len) != 0) {
- wpa_printf(MSG_INFO, "RSN: Initiator RSN IE in SMK and STK "
- "handshakes did not match");
- wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in SMK "
- "handshake",
- peerkey->rsnie_i, peerkey->rsnie_i_len);
- wpa_hexdump(MSG_DEBUG, "RSN: Initiator RSN IE in STK "
- "handshake",
- kde.rsn_ie, kde.rsn_ie_len);
- return;
- }
-
- if (os_memcmp(peerkey->inonce, key->key_nonce, WPA_NONCE_LEN) != 0) {
- wpa_printf(MSG_WARNING, "RSN: INonce from message 1 of STK "
- "4-Way Handshake differs from 3 of STK 4-Way "
- "Handshake - drop packet (src=" MACSTR ")",
- MAC2STR(peerkey->addr));
- wpa_hexdump(MSG_DEBUG, "RSN: INonce from message 1",
- peerkey->inonce, WPA_NONCE_LEN);
- wpa_hexdump(MSG_DEBUG, "RSN: INonce from message 3",
- key->key_nonce, WPA_NONCE_LEN);
- return;
- }
-
- wpa_supplicant_update_smk_lifetime(sm, peerkey, &kde);
-
- if (wpa_supplicant_send_4_of_4(sm, peerkey->addr, key, ver,
- WPA_GET_BE16(key->key_info),
- &peerkey->stk) < 0) {
- wpa_printf(MSG_INFO, "RSN: Failed to send STK message 4/4");
- return;
- }
-
- _key = peerkey->stk.tk;
- if (peerkey->cipher == WPA_CIPHER_TKIP) {
- /* Swap Tx/Rx keys for Michael MIC */
- os_memcpy(key_buf, _key, 16);
- os_memcpy(key_buf + 16, _key + 24, 8);
- os_memcpy(key_buf + 24, _key + 16, 8);
- _key = key_buf;
- key_len = 32;
- } else
- key_len = 16;
-
- os_memset(rsc, 0, 6);
- if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
- rsc, sizeof(rsc), _key, key_len) < 0) {
- os_memset(key_buf, 0, sizeof(key_buf));
- wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
- "driver.");
- return;
- }
- os_memset(key_buf, 0, sizeof(key_buf));
-}
-
-
-static void wpa_supplicant_process_stk_4_of_4(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- const struct wpa_eapol_key *key,
- u16 ver)
-{
- u8 rsc[6];
-
- wpa_printf(MSG_DEBUG, "RSN: RX message 4 of STK 4-Way Handshake from "
- MACSTR " (ver=%d)", MAC2STR(peerkey->addr), ver);
-
- os_memset(rsc, 0, 6);
- if (wpa_sm_set_key(sm, peerkey->cipher, peerkey->addr, 0, 1,
- rsc, sizeof(rsc), peerkey->stk.tk,
- peerkey->cipher == WPA_CIPHER_TKIP ? 32 : 16) < 0) {
- wpa_printf(MSG_WARNING, "RSN: Failed to set STK to the "
- "driver.");
- return;
- }
-}
-
-
-/**
- * peerkey_verify_eapol_key_mic - Verify PeerKey MIC
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * @peerkey: Pointer to the PeerKey data for the peer
- * @key: Pointer to the EAPOL-Key frame header
- * @ver: Version bits from EAPOL-Key Key Info
- * @buf: Pointer to the beginning of EAPOL-Key frame
- * @len: Length of the EAPOL-Key frame
- * Returns: 0 on success, -1 on failure
- */
-int peerkey_verify_eapol_key_mic(struct wpa_sm *sm,
- struct wpa_peerkey *peerkey,
- struct wpa_eapol_key *key, u16 ver,
- const u8 *buf, size_t len)
-{
- u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN], *mic_pos;
- size_t mic_len = 16;
- int ok = 0;
-
- if (peerkey->initiator && !peerkey->stk_set) {
- wpa_pmk_to_ptk(peerkey->smk, PMK_LEN, "Peer key expansion",
- sm->own_addr, peerkey->addr,
- peerkey->inonce, key->key_nonce,
- &peerkey->stk, peerkey->akmp, peerkey->cipher);
- peerkey->stk_set = 1;
- }
-
- mic_pos = (u8 *) (key + 1);
- os_memcpy(mic, mic_pos, mic_len);
- if (peerkey->tstk_set) {
- os_memset(mic_pos, 0, mic_len);
- wpa_eapol_key_mic(peerkey->tstk.kck, peerkey->tstk.kck_len,
- sm->key_mgmt, ver, buf, len, mic_pos);
- if (os_memcmp_const(mic, mic_pos, mic_len) != 0) {
- wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
- "when using TSTK - ignoring TSTK");
- } else {
- ok = 1;
- peerkey->tstk_set = 0;
- peerkey->stk_set = 1;
- os_memcpy(&peerkey->stk, &peerkey->tstk,
- sizeof(peerkey->stk));
- os_memset(&peerkey->tstk, 0, sizeof(peerkey->tstk));
- }
- }
-
- if (!ok && peerkey->stk_set) {
- os_memset(mic_pos, 0, mic_len);
- wpa_eapol_key_mic(peerkey->stk.kck, peerkey->stk.kck_len,
- sm->key_mgmt, ver, buf, len, mic_pos);
- if (os_memcmp_const(mic, mic_pos, mic_len) != 0) {
- wpa_printf(MSG_WARNING, "RSN: Invalid EAPOL-Key MIC "
- "- dropping packet");
- return -1;
- }
- ok = 1;
- }
-
- if (!ok) {
- wpa_printf(MSG_WARNING, "RSN: Could not verify EAPOL-Key MIC "
- "- dropping packet");
- return -1;
- }
-
- os_memcpy(peerkey->replay_counter, key->replay_counter,
- WPA_REPLAY_COUNTER_LEN);
- peerkey->replay_counter_set = 1;
- return 0;
-}
-
-
-/**
- * wpa_sm_stkstart - Send EAPOL-Key Request for STK handshake (STK M1)
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- * @peer: MAC address of the peer STA
- * Returns: 0 on success, or -1 on failure
- *
- * Send an EAPOL-Key Request to the current authenticator to start STK
- * handshake with the peer.
- */
-int wpa_sm_stkstart(struct wpa_sm *sm, const u8 *peer)
-{
- size_t rlen, kde_len, mic_len;
- struct wpa_eapol_key *req;
- int key_info, ver;
- u8 bssid[ETH_ALEN], *rbuf, *pos, *count_pos, *mic;
- u16 count;
- struct rsn_ie_hdr *hdr;
- struct wpa_peerkey *peerkey;
- struct wpa_ie_data ie;
-
- if (sm->proto != WPA_PROTO_RSN || !sm->ptk_set || !sm->peerkey_enabled)
- return -1;
-
- if (sm->ap_rsn_ie &&
- wpa_parse_wpa_ie_rsn(sm->ap_rsn_ie, sm->ap_rsn_ie_len, &ie) == 0 &&
- !(ie.capabilities & WPA_CAPABILITY_PEERKEY_ENABLED)) {
- wpa_printf(MSG_DEBUG, "RSN: Current AP does not support STK");
- return -1;
- }
-
- mic_len = wpa_mic_len(sm->key_mgmt, sm->pmk_len);
- if (sm->pairwise_cipher != WPA_CIPHER_TKIP)
- ver = WPA_KEY_INFO_TYPE_HMAC_SHA1_AES;
- else
- ver = WPA_KEY_INFO_TYPE_HMAC_MD5_RC4;
-
- if (wpa_sm_get_bssid(sm, bssid) < 0) {
- wpa_printf(MSG_WARNING, "Failed to read BSSID for EAPOL-Key "
- "SMK M1");
- return -1;
- }
-
- /* TODO: find existing entry and if found, use that instead of adding
- * a new one */
- peerkey = os_zalloc(sizeof(*peerkey));
- if (peerkey == NULL)
- return -1;
- peerkey->initiator = 1;
- os_memcpy(peerkey->addr, peer, ETH_ALEN);
- peerkey->akmp = sm->key_mgmt;
-
- /* SMK M1:
- * EAPOL-Key(S=1, M=1, A=0, I=0, K=0, SM=1, KeyRSC=0, Nonce=INonce,
- * MIC=MIC, DataKDs=(RSNIE_I, MAC_P KDE))
- */
-
- hdr = (struct rsn_ie_hdr *) peerkey->rsnie_i;
- hdr->elem_id = WLAN_EID_RSN;
- WPA_PUT_LE16(hdr->version, RSN_VERSION);
- pos = (u8 *) (hdr + 1);
- /* Group Suite can be anything for SMK RSN IE; receiver will just
- * ignore it. */
- RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
- pos += RSN_SELECTOR_LEN;
- count_pos = pos;
- pos += 2;
-
- count = rsn_cipher_put_suites(pos, sm->allowed_pairwise_cipher);
- pos += count * RSN_SELECTOR_LEN;
- WPA_PUT_LE16(count_pos, count);
-
- hdr->len = (pos - peerkey->rsnie_i) - 2;
- peerkey->rsnie_i_len = pos - peerkey->rsnie_i;
- wpa_hexdump(MSG_DEBUG, "WPA: RSN IE for SMK handshake",
- peerkey->rsnie_i, peerkey->rsnie_i_len);
-
- kde_len = peerkey->rsnie_i_len + 2 + RSN_SELECTOR_LEN + ETH_ALEN;
-
- rbuf = wpa_sm_alloc_eapol(sm, IEEE802_1X_TYPE_EAPOL_KEY, NULL,
- sizeof(*req) + mic_len + 2 + kde_len, &rlen,
- (void *) &req);
- if (rbuf == NULL) {
- wpa_supplicant_peerkey_free(sm, peerkey);
- return -1;
- }
-
- req->type = EAPOL_KEY_TYPE_RSN;
- key_info = WPA_KEY_INFO_SMK_MESSAGE | WPA_KEY_INFO_MIC |
- WPA_KEY_INFO_SECURE | WPA_KEY_INFO_REQUEST | ver;
- WPA_PUT_BE16(req->key_info, key_info);
- WPA_PUT_BE16(req->key_length, 0);
- os_memcpy(req->replay_counter, sm->request_counter,
- WPA_REPLAY_COUNTER_LEN);
- inc_byte_array(sm->request_counter, WPA_REPLAY_COUNTER_LEN);
-
- if (random_get_bytes(peerkey->inonce, WPA_NONCE_LEN)) {
- wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
- "WPA: Failed to get random data for INonce");
- os_free(rbuf);
- wpa_supplicant_peerkey_free(sm, peerkey);
- return -1;
- }
- os_memcpy(req->key_nonce, peerkey->inonce, WPA_NONCE_LEN);
- wpa_hexdump(MSG_DEBUG, "WPA: INonce for SMK handshake",
- req->key_nonce, WPA_NONCE_LEN);
-
- mic = pos = (u8 *) (req + 1);
- pos += mic_len;
- WPA_PUT_BE16(pos, (u16) kde_len);
- pos += 2;
-
- /* Initiator RSN IE */
- pos = wpa_add_ie(pos, peerkey->rsnie_i, peerkey->rsnie_i_len);
- /* Peer MAC address KDE */
- wpa_add_kde(pos, RSN_KEY_DATA_MAC_ADDR, peer, ETH_ALEN);
-
- wpa_printf(MSG_INFO, "RSN: Sending EAPOL-Key SMK M1 Request (peer "
- MACSTR ")", MAC2STR(peer));
- wpa_eapol_key_send(sm, &sm->ptk, ver, bssid, ETH_P_EAPOL, rbuf, rlen,
- mic);
-
- peerkey->next = sm->peerkey;
- sm->peerkey = peerkey;
-
- return 0;
-}
-
-
-/**
- * peerkey_deinit - Free PeerKey values
- * @sm: Pointer to WPA state machine data from wpa_sm_init()
- */
-void peerkey_deinit(struct wpa_sm *sm)
-{
- struct wpa_peerkey *prev, *peerkey = sm->peerkey;
- while (peerkey) {
- prev = peerkey;
- peerkey = peerkey->next;
- wpa_supplicant_peerkey_free(sm, prev);
- }
- sm->peerkey = NULL;
-}
-
-
-void peerkey_rx_eapol_4way(struct wpa_sm *sm, struct wpa_peerkey *peerkey,
- struct wpa_eapol_key *key, u16 key_info, u16 ver,
- const u8 *key_data, size_t key_data_len)
-{
- if ((key_info & (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) ==
- (WPA_KEY_INFO_MIC | WPA_KEY_INFO_ACK)) {
- /* 3/4 STK 4-Way Handshake */
- wpa_supplicant_process_stk_3_of_4(sm, peerkey, key, ver,
- key_data, key_data_len);
- } else if (key_info & WPA_KEY_INFO_ACK) {
- /* 1/4 STK 4-Way Handshake */
- wpa_supplicant_process_stk_1_of_4(sm, peerkey, key, ver,
- key_data, key_data_len);
- } else if (key_info & WPA_KEY_INFO_SECURE) {
- /* 4/4 STK 4-Way Handshake */
- wpa_supplicant_process_stk_4_of_4(sm, peerkey, key, ver);
- } else {
- /* 2/4 STK 4-Way Handshake */
- wpa_supplicant_process_stk_2_of_4(sm, peerkey, key, ver,
- key_data, key_data_len);
- }
-}
-
-
-void peerkey_rx_eapol_smk(struct wpa_sm *sm, const u8 *src_addr,
- struct wpa_eapol_key *key, const u8 *key_data,
- size_t key_data_len,
- u16 key_info, u16 ver)
-{
- if (key_info & WPA_KEY_INFO_ERROR) {
- /* SMK Error */
- wpa_supplicant_process_smk_error(sm, src_addr, key_data,
- key_data_len);
- } else if (key_info & WPA_KEY_INFO_ACK) {
- /* SMK M2 */
- wpa_supplicant_process_smk_m2(sm, src_addr, key, key_data,
- key_data_len, ver);
- } else {
- /* SMK M4 or M5 */
- wpa_supplicant_process_smk_m45(sm, src_addr, key, key_data,
- key_data_len, ver);
- }
-}
-
-#endif /* CONFIG_PEERKEY */
projects / thirdparty / hostap.git / commitdiff
