| /* |
| * WPA Supplicant - IEEE 802.11r - Fast BSS Transition |
| * 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" |
| |
| #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) |
| { |
| 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); |
| return wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr, |
| sm->bssid, sm->pmk_r1_name, ptk, ptk_name, |
| sm->key_mgmt, sm->pairwise_cipher); |
| } |
| |
| |
| /** |
| * 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 |
| * @kck_len: KCK length in octets |
| * @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, size_t kck_len, |
| 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 if (sm->key_mgmt == WPA_KEY_MGMT_FT_SAE) |
| RSN_SELECTOR_PUT(pos, RSN_AUTH_KEY_MGMT_FT_SAE); |
| 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, kck_len, 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.tk, 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, 0, 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; |
| 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 (!wpa_key_mgmt_ft(sm->key_mgmt)) { |
| 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_const(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_const(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; |
| if (wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, ftie->anonce, |
| sm->own_addr, bssid, sm->pmk_r1_name, &sm->ptk, |
| ptk_name, sm->key_mgmt, sm->pairwise_cipher) < 0) |
| return -1; |
| |
| ft_ies = wpa_ft_gen_req_ies(sm, &ft_ies_len, ftie->anonce, |
| sm->pmk_r1_name, |
| sm->ptk.kck, sm->ptk.kck_len, 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 (!wpa_key_mgmt_ft(sm->key_mgmt)) |
| 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, sm->ptk.kek_len, 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, sm->ptk.kek_len, 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[WPA_EAPOL_KEY_MIC_MAX_LEN]; |
| |
| wpa_hexdump(MSG_DEBUG, "FT: Response IEs", ies, ies_len); |
| |
| if (!wpa_key_mgmt_ft(sm->key_mgmt)) { |
| 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_const(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_const(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_const(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->ptk.kck_len, 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_const(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, 0, 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 */ |