/* * WPA Supplicant - IEEE 802.11r - Fast BSS Transition * Copyright (c) 2006-2007, 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" #include "common.h" #include "crypto/aes_wrap.h" #include "crypto/random.h" #include "common/ieee802_11_defs.h" #include "common/ieee802_11_common.h" #include "wpa.h" #include "wpa_i.h" #ifdef CONFIG_IEEE80211R int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr, const struct wpa_eapol_key *key, struct wpa_ptk *ptk, size_t ptk_len) { u8 ptk_name[WPA_PMK_NAME_LEN]; const u8 *anonce = key->key_nonce; if (sm->xxkey_len == 0) { wpa_printf(MSG_DEBUG, "FT: XXKey not available for key " "derivation"); return -1; } wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid, sm->ssid_len, sm->mobility_domain, sm->r0kh_id, sm->r0kh_id_len, sm->own_addr, sm->pmk_r0, sm->pmk_r0_name); wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, PMK_LEN); wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", sm->pmk_r0_name, WPA_PMK_NAME_LEN); wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, WPA_PMK_NAME_LEN); wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, sm->bssid, sm->pmk_r1_name, (u8 *) ptk, ptk_len, ptk_name); wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) ptk, ptk_len); wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); return 0; } /** * wpa_sm_set_ft_params - Set FT (IEEE 802.11r) parameters * @sm: Pointer to WPA state machine data from wpa_sm_init() * @ies: Association Response IEs or %NULL to clear FT parameters * @ies_len: Length of ies buffer in octets * Returns: 0 on success, -1 on failure */ int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *ies, size_t ies_len) { struct wpa_ft_ies ft; if (sm == NULL) return 0; if (wpa_ft_parse_ies(ies, ies_len, &ft) < 0) return -1; if (ft.mdie && ft.mdie_len < MOBILITY_DOMAIN_ID_LEN + 1) return -1; if (ft.mdie) { wpa_hexdump(MSG_DEBUG, "FT: Mobility domain", ft.mdie, MOBILITY_DOMAIN_ID_LEN); os_memcpy(sm->mobility_domain, ft.mdie, MOBILITY_DOMAIN_ID_LEN); sm->mdie_ft_capab = ft.mdie[MOBILITY_DOMAIN_ID_LEN]; wpa_printf(MSG_DEBUG, "FT: Capability and Policy: 0x%02x", sm->mdie_ft_capab); } else os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN); if (ft.r0kh_id) { wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", ft.r0kh_id, ft.r0kh_id_len); os_memcpy(sm->r0kh_id, ft.r0kh_id, ft.r0kh_id_len); sm->r0kh_id_len = ft.r0kh_id_len; } else { /* FIX: When should R0KH-ID be cleared? We need to keep the * old R0KH-ID in order to be able to use this during FT. */ /* * os_memset(sm->r0kh_id, 0, FT_R0KH_ID_LEN); * sm->r0kh_id_len = 0; */ } if (ft.r1kh_id) { wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", ft.r1kh_id, FT_R1KH_ID_LEN); os_memcpy(sm->r1kh_id, ft.r1kh_id, FT_R1KH_ID_LEN); } else os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN); os_free(sm->assoc_resp_ies); sm->assoc_resp_ies = os_malloc(ft.mdie_len + 2 + ft.ftie_len + 2); if (sm->assoc_resp_ies) { u8 *pos = sm->assoc_resp_ies; if (ft.mdie) { os_memcpy(pos, ft.mdie - 2, ft.mdie_len + 2); pos += ft.mdie_len + 2; } if (ft.ftie) { os_memcpy(pos, ft.ftie - 2, ft.ftie_len + 2); pos += ft.ftie_len + 2; } sm->assoc_resp_ies_len = pos - sm->assoc_resp_ies; wpa_hexdump(MSG_DEBUG, "FT: Stored MDIE and FTIE from " "(Re)Association Response", sm->assoc_resp_ies, sm->assoc_resp_ies_len); } return 0; } /** * wpa_ft_gen_req_ies - Generate FT (IEEE 802.11r) IEs for Auth/ReAssoc Request * @sm: Pointer to WPA state machine data from wpa_sm_init() * @len: Buffer for returning the length of the IEs * @anonce: ANonce or %NULL if not yet available * @pmk_name: PMKR0Name or PMKR1Name to be added into the RSN IE PMKID List * @kck: 128-bit KCK for MIC or %NULL if no MIC is used * @target_ap: Target AP address * @ric_ies: Optional IE(s), e.g., WMM TSPEC(s), for RIC-Request or %NULL * @ric_ies_len: Length of ric_ies buffer in octets * @ap_mdie: Mobility Domain IE from the target AP * Returns: Pointer to buffer with IEs or %NULL on failure * * Caller is responsible for freeing the returned buffer with os_free(); */ static u8 * wpa_ft_gen_req_ies(struct wpa_sm *sm, size_t *len, const u8 *anonce, const u8 *pmk_name, const u8 *kck, const u8 *target_ap, const u8 *ric_ies, size_t ric_ies_len, const u8 *ap_mdie) { size_t buf_len; u8 *buf, *pos, *ftie_len, *ftie_pos; struct rsn_mdie *mdie; struct rsn_ftie *ftie; struct rsn_ie_hdr *rsnie; u16 capab; sm->ft_completed = 0; buf_len = 2 + sizeof(struct rsn_mdie) + 2 + sizeof(struct rsn_ftie) + 2 + sm->r0kh_id_len + ric_ies_len + 100; buf = os_zalloc(buf_len); if (buf == NULL) return NULL; pos = buf; /* RSNIE[PMKR0Name/PMKR1Name] */ rsnie = (struct rsn_ie_hdr *) pos; rsnie->elem_id = WLAN_EID_RSN; WPA_PUT_LE16(rsnie->version, RSN_VERSION); pos = (u8 *) (rsnie + 1); /* Group Suite Selector */ if (sm->group_cipher != WPA_CIPHER_CCMP && sm->group_cipher != WPA_CIPHER_GCMP && sm->group_cipher != WPA_CIPHER_TKIP) { wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)", sm->group_cipher); os_free(buf); return NULL; } RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, sm->group_cipher)); pos += RSN_SELECTOR_LEN; /* Pairwise Suite Count */ WPA_PUT_LE16(pos, 1); pos += 2; /* Pairwise Suite List */ if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)", sm->pairwise_cipher); os_free(buf); return NULL; } RSN_SELECTOR_PUT(pos, wpa_cipher_to_suite(WPA_PROTO_RSN, sm->pairwise_cipher)); pos += RSN_SELECTOR_LEN; /* Authenticated Key Management Suite Count */ WPA_PUT_LE16(pos, 1); pos += 2; /* Authenticated Key Management Suite List */ if (sm->key_mgmt == WPA_KEY_MGMT_FT_IEEE8021X) RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_802_1X); else if (sm->key_mgmt == WPA_KEY_MGMT_FT_PSK) RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_PSK); else { wpa_printf(MSG_WARNING, "FT: Invalid key management type (%d)", sm->key_mgmt); os_free(buf); return NULL; } pos += RSN_SELECTOR_LEN; /* RSN Capabilities */ capab = 0; #ifdef CONFIG_IEEE80211W if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) capab |= WPA_CAPABILITY_MFPC; #endif /* CONFIG_IEEE80211W */ WPA_PUT_LE16(pos, capab); pos += 2; /* PMKID Count */ WPA_PUT_LE16(pos, 1); pos += 2; /* PMKID List [PMKR0Name/PMKR1Name] */ os_memcpy(pos, pmk_name, WPA_PMK_NAME_LEN); pos += WPA_PMK_NAME_LEN; #ifdef CONFIG_IEEE80211W if (sm->mgmt_group_cipher == WPA_CIPHER_AES_128_CMAC) { /* Management Group Cipher Suite */ RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_AES_128_CMAC); pos += RSN_SELECTOR_LEN; } #endif /* CONFIG_IEEE80211W */ rsnie->len = (pos - (u8 *) rsnie) - 2; /* MDIE */ *pos++ = WLAN_EID_MOBILITY_DOMAIN; *pos++ = sizeof(*mdie); mdie = (struct rsn_mdie *) pos; pos += sizeof(*mdie); os_memcpy(mdie->mobility_domain, sm->mobility_domain, MOBILITY_DOMAIN_ID_LEN); mdie->ft_capab = ap_mdie && ap_mdie[1] >= 3 ? ap_mdie[4] : sm->mdie_ft_capab; /* FTIE[SNonce, [R1KH-ID,] R0KH-ID ] */ ftie_pos = pos; *pos++ = WLAN_EID_FAST_BSS_TRANSITION; ftie_len = pos++; ftie = (struct rsn_ftie *) pos; pos += sizeof(*ftie); os_memcpy(ftie->snonce, sm->snonce, WPA_NONCE_LEN); if (anonce) os_memcpy(ftie->anonce, anonce, WPA_NONCE_LEN); if (kck) { /* R1KH-ID sub-element in third FT message */ *pos++ = FTIE_SUBELEM_R1KH_ID; *pos++ = FT_R1KH_ID_LEN; os_memcpy(pos, sm->r1kh_id, FT_R1KH_ID_LEN); pos += FT_R1KH_ID_LEN; } /* R0KH-ID sub-element */ *pos++ = FTIE_SUBELEM_R0KH_ID; *pos++ = sm->r0kh_id_len; os_memcpy(pos, sm->r0kh_id, sm->r0kh_id_len); pos += sm->r0kh_id_len; *ftie_len = pos - ftie_len - 1; if (ric_ies) { /* RIC Request */ os_memcpy(pos, ric_ies, ric_ies_len); pos += ric_ies_len; } if (kck) { /* * IEEE Std 802.11r-2008, 11A.8.4 * MIC shall be calculated over: * non-AP STA MAC address * Target AP MAC address * Transaction seq number (5 for ReassocReq, 3 otherwise) * RSN IE * MDIE * FTIE (with MIC field set to 0) * RIC-Request (if present) */ /* Information element count */ ftie->mic_control[1] = 3 + ieee802_11_ie_count(ric_ies, ric_ies_len); if (wpa_ft_mic(kck, sm->own_addr, target_ap, 5, ((u8 *) mdie) - 2, 2 + sizeof(*mdie), ftie_pos, 2 + *ftie_len, (u8 *) rsnie, 2 + rsnie->len, ric_ies, ric_ies_len, ftie->mic) < 0) { wpa_printf(MSG_INFO, "FT: Failed to calculate MIC"); os_free(buf); return NULL; } } *len = pos - buf; return buf; } static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid) { int keylen; enum wpa_alg alg; u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 }; wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver."); if (!wpa_cipher_valid_pairwise(sm->pairwise_cipher)) { wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d", sm->pairwise_cipher); return -1; } alg = wpa_cipher_to_alg(sm->pairwise_cipher); keylen = wpa_cipher_key_len(sm->pairwise_cipher); if (wpa_sm_set_key(sm, alg, bssid, 0, 1, null_rsc, sizeof(null_rsc), (u8 *) sm->ptk.tk1, keylen) < 0) { wpa_printf(MSG_WARNING, "FT: Failed to set PTK to the driver"); return -1; } return 0; } /** * wpa_ft_prepare_auth_request - Generate over-the-air auth request * @sm: Pointer to WPA state machine data from wpa_sm_init() * @mdie: Target AP MDIE * Returns: 0 on success, -1 on failure */ int wpa_ft_prepare_auth_request(struct wpa_sm *sm, const u8 *mdie) { u8 *ft_ies; size_t ft_ies_len; /* Generate a new SNonce */ if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); return -1; } ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, NULL, sm->bssid, NULL, 0, mdie); if (ft_ies) { wpa_sm_update_ft_ies(sm, sm->mobility_domain, ft_ies, ft_ies_len); os_free(ft_ies); } return 0; } int wpa_ft_process_response(struct wpa_sm *sm, const u8 *ies, size_t ies_len, int ft_action, const u8 *target_ap, const u8 *ric_ies, size_t ric_ies_len) { u8 *ft_ies; size_t ft_ies_len, ptk_len; struct wpa_ft_ies parse; struct rsn_mdie *mdie; struct rsn_ftie *ftie; u8 ptk_name[WPA_PMK_NAME_LEN]; int ret; const u8 *bssid; wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); wpa_hexdump(MSG_DEBUG, "FT: RIC IEs", ric_ies, ric_ies_len); if (ft_action) { if (!sm->over_the_ds_in_progress) { wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " "- drop FT Action Response"); return -1; } if (os_memcmp(target_ap, sm->target_ap, ETH_ALEN) != 0) { wpa_printf(MSG_DEBUG, "FT: No over-the-DS in progress " "with this Target AP - drop FT Action " "Response"); return -1; } } if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " "enabled for this connection"); return -1; } if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); return -1; } mdie = (struct rsn_mdie *) parse.mdie; if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || os_memcmp(mdie->mobility_domain, sm->mobility_domain, MOBILITY_DOMAIN_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); return -1; } ftie = (struct rsn_ftie *) parse.ftie; if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return -1; } if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", ftie->snonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", sm->snonce, WPA_NONCE_LEN); return -1; } if (parse.r0kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); return -1; } if (parse.r0kh_id_len != sm->r0kh_id_len || os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " "the current R0KH-ID"); wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", parse.r0kh_id, parse.r0kh_id_len); wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", sm->r0kh_id, sm->r0kh_id_len); return -1; } if (parse.r1kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); return -1; } if (parse.rsn_pmkid == NULL || os_memcmp(parse.rsn_pmkid, sm->pmk_r0_name, WPA_PMK_NAME_LEN)) { wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name (PMKID) in " "RSNIE"); return -1; } os_memcpy(sm->r1kh_id, parse.r1kh_id, FT_R1KH_ID_LEN); wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", sm->r1kh_id, FT_R1KH_ID_LEN); wpa_hexdump(MSG_DEBUG, "FT: SNonce", sm->snonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: ANonce", ftie->anonce, WPA_NONCE_LEN); os_memcpy(sm->anonce, ftie->anonce, WPA_NONCE_LEN); wpa_derive_pmk_r1(sm->pmk_r0, sm->pmk_r0_name, sm->r1kh_id, sm->own_addr, sm->pmk_r1, sm->pmk_r1_name); wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN); wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name, WPA_PMK_NAME_LEN); bssid = target_ap; ptk_len = sm->pairwise_cipher != WPA_CIPHER_TKIP ? 48 : 64; wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, sm->own_addr, bssid, sm->pmk_r1_name, (u8 *) &sm->ptk, ptk_len, ptk_name); wpa_hexdump_key(MSG_DEBUG, "FT: PTK", (u8 *) &sm->ptk, ptk_len); wpa_hexdump(MSG_DEBUG, "FT: PTKName", ptk_name, WPA_PMK_NAME_LEN); ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, sm->pmk_r1_name, sm->ptk.kck, bssid, ric_ies, ric_ies_len, parse.mdie ? parse.mdie - 2 : NULL); if (ft_ies) { wpa_sm_update_ft_ies(sm, sm->mobility_domain, ft_ies, ft_ies_len); os_free(ft_ies); } wpa_sm_mark_authenticated(sm, bssid); ret = wpa_ft_install_ptk(sm, bssid); if (ret) { /* * Some drivers do not support key configuration when we are * not associated with the target AP. Work around this by * trying again after the following reassociation gets * completed. */ wpa_printf(MSG_DEBUG, "FT: Failed to set PTK prior to " "association - try again after reassociation"); sm->set_ptk_after_assoc = 1; } else sm->set_ptk_after_assoc = 0; sm->ft_completed = 1; if (ft_action) { /* * The caller is expected trigger re-association with the * Target AP. */ os_memcpy(sm->bssid, target_ap, ETH_ALEN); } return 0; } int wpa_ft_is_completed(struct wpa_sm *sm) { if (sm == NULL) return 0; if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) return 0; return sm->ft_completed; } void wpa_reset_ft_completed(struct wpa_sm *sm) { if (sm != NULL) sm->ft_completed = 0; } static int wpa_ft_process_gtk_subelem(struct wpa_sm *sm, const u8 *gtk_elem, size_t gtk_elem_len) { u8 gtk[32]; int keyidx; enum wpa_alg alg; size_t gtk_len, keylen, rsc_len; if (gtk_elem == NULL) { wpa_printf(MSG_DEBUG, "FT: No GTK included in FTIE"); return 0; } wpa_hexdump_key(MSG_DEBUG, "FT: Received GTK in Reassoc Resp", gtk_elem, gtk_elem_len); if (gtk_elem_len < 11 + 24 || (gtk_elem_len - 11) % 8 || gtk_elem_len - 19 > sizeof(gtk)) { wpa_printf(MSG_DEBUG, "FT: Invalid GTK sub-elem " "length %lu", (unsigned long) gtk_elem_len); return -1; } gtk_len = gtk_elem_len - 19; if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 11, gtk)) { wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " "decrypt GTK"); return -1; } keylen = wpa_cipher_key_len(sm->group_cipher); rsc_len = wpa_cipher_rsc_len(sm->group_cipher); alg = wpa_cipher_to_alg(sm->group_cipher); if (alg == WPA_ALG_NONE) { wpa_printf(MSG_WARNING, "WPA: Unsupported Group Cipher %d", sm->group_cipher); return -1; } if (gtk_len < keylen) { wpa_printf(MSG_DEBUG, "FT: Too short GTK in FTIE"); return -1; } /* Key Info[2] | Key Length[1] | RSC[8] | Key[5..32]. */ keyidx = WPA_GET_LE16(gtk_elem) & 0x03; if (gtk_elem[2] != keylen) { wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d " "negotiated %lu", gtk_elem[2], (unsigned long) keylen); return -1; } wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen); if (sm->group_cipher == WPA_CIPHER_TKIP) { /* Swap Tx/Rx keys for Michael MIC */ u8 tmp[8]; os_memcpy(tmp, gtk + 16, 8); os_memcpy(gtk + 16, gtk + 24, 8); os_memcpy(gtk + 24, tmp, 8); } if (wpa_sm_set_key(sm, alg, broadcast_ether_addr, keyidx, 0, gtk_elem + 3, rsc_len, gtk, keylen) < 0) { wpa_printf(MSG_WARNING, "WPA: Failed to set GTK to the " "driver."); return -1; } return 0; } #ifdef CONFIG_IEEE80211W static int wpa_ft_process_igtk_subelem(struct wpa_sm *sm, const u8 *igtk_elem, size_t igtk_elem_len) { u8 igtk[WPA_IGTK_LEN]; u16 keyidx; if (sm->mgmt_group_cipher != WPA_CIPHER_AES_128_CMAC) return 0; if (igtk_elem == NULL) { wpa_printf(MSG_DEBUG, "FT: No IGTK included in FTIE"); return 0; } wpa_hexdump_key(MSG_DEBUG, "FT: Received IGTK in Reassoc Resp", igtk_elem, igtk_elem_len); if (igtk_elem_len != 2 + 6 + 1 + WPA_IGTK_LEN + 8) { wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem " "length %lu", (unsigned long) igtk_elem_len); return -1; } if (igtk_elem[8] != WPA_IGTK_LEN) { wpa_printf(MSG_DEBUG, "FT: Invalid IGTK sub-elem Key Length " "%d", igtk_elem[8]); return -1; } if (aes_unwrap(sm->ptk.kek, WPA_IGTK_LEN / 8, igtk_elem + 9, igtk)) { wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not " "decrypt IGTK"); return -1; } /* KeyID[2] | IPN[6] | Key Length[1] | Key[16+8] */ keyidx = WPA_GET_LE16(igtk_elem); wpa_hexdump_key(MSG_DEBUG, "FT: IGTK from Reassoc Resp", igtk, WPA_IGTK_LEN); if (wpa_sm_set_key(sm, WPA_ALG_IGTK, broadcast_ether_addr, keyidx, 0, igtk_elem + 2, 6, igtk, WPA_IGTK_LEN) < 0) { wpa_printf(MSG_WARNING, "WPA: Failed to set IGTK to the " "driver."); return -1; } return 0; } #endif /* CONFIG_IEEE80211W */ int wpa_ft_validate_reassoc_resp(struct wpa_sm *sm, const u8 *ies, size_t ies_len, const u8 *src_addr) { struct wpa_ft_ies parse; struct rsn_mdie *mdie; struct rsn_ftie *ftie; unsigned int count; u8 mic[16]; wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); if (sm->key_mgmt != WPA_KEY_MGMT_FT_IEEE8021X && sm->key_mgmt != WPA_KEY_MGMT_FT_PSK) { wpa_printf(MSG_DEBUG, "FT: Reject FT IEs since FT is not " "enabled for this connection"); return -1; } if (wpa_ft_parse_ies(ies, ies_len, &parse) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to parse IEs"); return -1; } mdie = (struct rsn_mdie *) parse.mdie; if (mdie == NULL || parse.mdie_len < sizeof(*mdie) || os_memcmp(mdie->mobility_domain, sm->mobility_domain, MOBILITY_DOMAIN_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MDIE"); return -1; } ftie = (struct rsn_ftie *) parse.ftie; if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); return -1; } if (os_memcmp(ftie->snonce, sm->snonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", ftie->snonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", sm->snonce, WPA_NONCE_LEN); return -1; } if (os_memcmp(ftie->anonce, sm->anonce, WPA_NONCE_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", ftie->anonce, WPA_NONCE_LEN); wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", sm->anonce, WPA_NONCE_LEN); return -1; } if (parse.r0kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); return -1; } if (parse.r0kh_id_len != sm->r0kh_id_len || os_memcmp(parse.r0kh_id, sm->r0kh_id, parse.r0kh_id_len) != 0) { wpa_printf(MSG_DEBUG, "FT: R0KH-ID in FTIE did not match with " "the current R0KH-ID"); wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID in FTIE", parse.r0kh_id, parse.r0kh_id_len); wpa_hexdump(MSG_DEBUG, "FT: The current R0KH-ID", sm->r0kh_id, sm->r0kh_id_len); return -1; } if (parse.r1kh_id == NULL) { wpa_printf(MSG_DEBUG, "FT: No R1KH-ID subelem in FTIE"); return -1; } if (os_memcmp(parse.r1kh_id, sm->r1kh_id, FT_R1KH_ID_LEN) != 0) { wpa_printf(MSG_DEBUG, "FT: Unknown R1KH-ID used in " "ReassocResp"); return -1; } if (parse.rsn_pmkid == NULL || os_memcmp(parse.rsn_pmkid, sm->pmk_r1_name, WPA_PMK_NAME_LEN)) { wpa_printf(MSG_DEBUG, "FT: No matching PMKR1Name (PMKID) in " "RSNIE (pmkid=%d)", !!parse.rsn_pmkid); return -1; } count = 3; if (parse.ric) count += ieee802_11_ie_count(parse.ric, parse.ric_len); if (ftie->mic_control[1] != count) { wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " "Control: received %u expected %u", ftie->mic_control[1], count); return -1; } if (wpa_ft_mic(sm->ptk.kck, sm->own_addr, src_addr, 6, parse.mdie - 2, parse.mdie_len + 2, parse.ftie - 2, parse.ftie_len + 2, parse.rsn - 2, parse.rsn_len + 2, parse.ric, parse.ric_len, mic) < 0) { wpa_printf(MSG_DEBUG, "FT: Failed to calculate MIC"); return -1; } if (os_memcmp(mic, ftie->mic, 16) != 0) { wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", ftie->mic, 16); wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, 16); return -1; } if (wpa_ft_process_gtk_subelem(sm, parse.gtk, parse.gtk_len) < 0) return -1; #ifdef CONFIG_IEEE80211W if (wpa_ft_process_igtk_subelem(sm, parse.igtk, parse.igtk_len) < 0) return -1; #endif /* CONFIG_IEEE80211W */ if (sm->set_ptk_after_assoc) { wpa_printf(MSG_DEBUG, "FT: Try to set PTK again now that we " "are associated"); if (wpa_ft_install_ptk(sm, src_addr) < 0) return -1; sm->set_ptk_after_assoc = 0; } if (parse.ric) { wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response", parse.ric, parse.ric_len); /* TODO: parse response and inform driver about results when * using wpa_supplicant SME */ } wpa_printf(MSG_DEBUG, "FT: Completed successfully"); return 0; } /** * wpa_ft_start_over_ds - Generate over-the-DS auth request * @sm: Pointer to WPA state machine data from wpa_sm_init() * @target_ap: Target AP Address * @mdie: Mobility Domain IE from the target AP * Returns: 0 on success, -1 on failure */ int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap, const u8 *mdie) { u8 *ft_ies; size_t ft_ies_len; wpa_printf(MSG_DEBUG, "FT: Request over-the-DS with " MACSTR, MAC2STR(target_ap)); /* Generate a new SNonce */ if (random_get_bytes(sm->snonce, WPA_NONCE_LEN)) { wpa_printf(MSG_INFO, "FT: Failed to generate a new SNonce"); return -1; } ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, NULL, sm->pmk_r0_name, NULL, target_ap, NULL, 0, mdie); if (ft_ies) { sm->over_the_ds_in_progress = 1; os_memcpy(sm->target_ap, target_ap, ETH_ALEN); wpa_sm_send_ft_action(sm, 1, target_ap, ft_ies, ft_ies_len); os_free(ft_ies); } return 0; } #endif /* CONFIG_IEEE80211R */