wpa_ft.c

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#include "includes.h"

#include "common.h"
#include "wpa.h"
#include "wpa_i.h"
#include "wpa_ie.h"
#include "aes_wrap.h"
#include "ieee802_11_defs.h"
#include "ieee802_11_common.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 pmk_r1_name[WPA_PMK_NAME_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, pmk_r1_name);
        wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", sm->pmk_r1, PMK_LEN);
        wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
        wpa_pmk_r1_to_ptk(sm->pmk_r1, sm->snonce, anonce, sm->own_addr,
                          sm->bssid, 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;
}


int wpa_sm_set_ft_params(struct wpa_sm *sm, const u8 *mobility_domain,
                         const u8 *r0kh_id, size_t r0kh_id_len,
                         const u8 *r1kh_id)
{
        if (sm && mobility_domain) {
                wpa_hexdump(MSG_DEBUG, "FT: Mobility domain",
                            mobility_domain, MOBILITY_DOMAIN_ID_LEN);
                os_memcpy(sm->mobility_domain, mobility_domain,
                          MOBILITY_DOMAIN_ID_LEN);
        } else if (sm)
                os_memset(sm->mobility_domain, 0, MOBILITY_DOMAIN_ID_LEN);

        if (sm && r0kh_id) {
                if (r0kh_id_len > FT_R0KH_ID_MAX_LEN)
                        return -1;
                wpa_hexdump(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
                os_memcpy(sm->r0kh_id, r0kh_id, r0kh_id_len);
                sm->r0kh_id_len = r0kh_id_len;
        } else if (sm) {
                /* 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 (sm && r1kh_id) {
                wpa_hexdump(MSG_DEBUG, "FT: R1KH-ID", r1kh_id, FT_R1KH_ID_LEN);
                os_memcpy(sm->r1kh_id, r1kh_id, FT_R1KH_ID_LEN);
        } else if (sm)
                os_memset(sm->r1kh_id, 0, FT_R1KH_ID_LEN);

        return 0;
}


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)
{
        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)
                RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
        else if (sm->group_cipher == WPA_CIPHER_TKIP)
                RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
        else {
                wpa_printf(MSG_WARNING, "FT: Invalid group cipher (%d)",
                           sm->group_cipher);
                os_free(buf);
                return NULL;
        }
        pos += RSN_SELECTOR_LEN;

        /* Pairwise Suite Count */
        WPA_PUT_LE16(pos, 1);
        pos += 2;

        /* Pairwise Suite List */
        if (sm->pairwise_cipher == WPA_CIPHER_CCMP)
                RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_CCMP);
        else if (sm->pairwise_cipher == WPA_CIPHER_TKIP)
                RSN_SELECTOR_PUT(pos, RSN_CIPHER_SUITE_TKIP);
        else {
                wpa_printf(MSG_WARNING, "FT: Invalid pairwise cipher (%d)",
                           sm->pairwise_cipher);
                os_free(buf);
                return NULL;
        }
        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 = 0; /* FIX: copy from the target AP's MDIE */

        /* FTIE[SNonce, 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);
        /* 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;
}


struct wpa_ft_ies {
        const u8 *mdie;
        size_t mdie_len;
        const u8 *ftie;
        size_t ftie_len;
        const u8 *r1kh_id;
        const u8 *gtk;
        size_t gtk_len;
        const u8 *r0kh_id;
        size_t r0kh_id_len;
        const u8 *rsn;
        size_t rsn_len;
        const u8 *rsn_pmkid;
        const u8 *tie;
        size_t tie_len;
        const u8 *igtk;
        size_t igtk_len;
        const u8 *ric;
        size_t ric_len;
};


static int wpa_ft_parse_ftie(const u8 *ie, size_t ie_len,
                             struct wpa_ft_ies *parse)
{
        const u8 *end, *pos;

        parse->ftie = ie;
        parse->ftie_len = ie_len;

        pos = ie + sizeof(struct rsn_ftie);
        end = ie + ie_len;

        while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
                switch (pos[0]) {
                case FTIE_SUBELEM_R1KH_ID:
                        if (pos[1] != FT_R1KH_ID_LEN) {
                                wpa_printf(MSG_DEBUG, "FT: Invalid R1KH-ID "
                                           "length in FTIE: %d", pos[1]);
                                return -1;
                        }
                        parse->r1kh_id = pos + 2;
                        break;
                case FTIE_SUBELEM_GTK:
                        parse->gtk = pos + 2;
                        parse->gtk_len = pos[1];
                        break;
                case FTIE_SUBELEM_R0KH_ID:
                        if (pos[1] < 1 || pos[1] > FT_R0KH_ID_MAX_LEN) {
                                wpa_printf(MSG_DEBUG, "FT: Invalid R0KH-ID "
                                           "length in FTIE: %d", pos[1]);
                                return -1;
                        }
                        parse->r0kh_id = pos + 2;
                        parse->r0kh_id_len = pos[1];
                        break;
#ifdef CONFIG_IEEE80211W
                case FTIE_SUBELEM_IGTK:
                        parse->igtk = pos + 2;
                        parse->igtk_len = pos[1];
                        break;
#endif /* CONFIG_IEEE80211W */
                }

                pos += 2 + pos[1];
        }

        return 0;
}


static int wpa_ft_parse_ies(const u8 *ies, size_t ies_len,
                            struct wpa_ft_ies *parse)
{
        const u8 *end, *pos;
        struct wpa_ie_data data;
        int ret;
        const struct rsn_ftie *ftie;
        int prot_ie_count = 0;

        os_memset(parse, 0, sizeof(*parse));
        if (ies == NULL)
                return 0;

        pos = ies;
        end = ies + ies_len;
        while (pos + 2 <= end && pos + 2 + pos[1] <= end) {
                switch (pos[0]) {
                case WLAN_EID_RSN:
                        parse->rsn = pos + 2;
                        parse->rsn_len = pos[1];
                        ret = wpa_parse_wpa_ie_rsn(parse->rsn - 2,
                                                   parse->rsn_len + 2,
                                                   &data);
                        if (ret < 0) {
                                wpa_printf(MSG_DEBUG, "FT: Failed to parse "
                                           "RSN IE: %d", ret);
                                return -1;
                        }
                        if (data.num_pmkid == 1 && data.pmkid)
                                parse->rsn_pmkid = data.pmkid;
                        break;
                case WLAN_EID_MOBILITY_DOMAIN:
                        parse->mdie = pos + 2;
                        parse->mdie_len = pos[1];
                        break;
                case WLAN_EID_FAST_BSS_TRANSITION:
                        if (pos[1] < sizeof(*ftie))
                                return -1;
                        ftie = (const struct rsn_ftie *) (pos + 2);
                        prot_ie_count = ftie->mic_control[1];
                        if (wpa_ft_parse_ftie(pos + 2, pos[1], parse) < 0)
                                return -1;
                        break;
                case WLAN_EID_TIMEOUT_INTERVAL:
                        parse->tie = pos + 2;
                        parse->tie_len = pos[1];
                        break;
                case WLAN_EID_RIC_DATA:
                        if (parse->ric == NULL)
                                parse->ric = pos;
                }

                pos += 2 + pos[1];
        }

        if (prot_ie_count == 0)
                return 0; /* no MIC */

        /*
         * Check that the protected IE count matches with IEs included in the
         * frame.
         */
        if (parse->rsn)
                prot_ie_count--;
        if (parse->mdie)
                prot_ie_count--;
        if (parse->ftie)
                prot_ie_count--;
        if (parse->tie)
                prot_ie_count--;
        if (prot_ie_count < 0) {
                wpa_printf(MSG_DEBUG, "FT: Some required IEs not included in "
                           "the protected IE count");
                return -1;
        }

        if (prot_ie_count == 0 && parse->ric) {
                wpa_printf(MSG_DEBUG, "FT: RIC IE(s) in the frame, but not "
                           "included in protected IE count");
                return -1;
        }

        /* Determine the end of the RIC IE(s) */
        pos = parse->ric;
        while (pos && pos + 2 <= end && pos + 2 + pos[1] <= end &&
               prot_ie_count) {
                prot_ie_count--;
                pos += 2 + pos[1];
        }
        parse->ric_len = pos - parse->ric;
        if (prot_ie_count) {
                wpa_printf(MSG_DEBUG, "FT: %d protected IEs missing from "
                           "frame", (int) prot_ie_count);
                return -1;
        }

        return 0;
}


static int wpa_ft_install_ptk(struct wpa_sm *sm, const u8 *bssid)
{
        int keylen;
        wpa_alg alg;
        u8 null_rsc[6] = { 0, 0, 0, 0, 0, 0 };

        wpa_printf(MSG_DEBUG, "FT: Installing PTK to the driver.");

        switch (sm->pairwise_cipher) {
        case WPA_CIPHER_CCMP:
                alg = WPA_ALG_CCMP;
                keylen = 16;
                break;
        case WPA_CIPHER_TKIP:
                alg = WPA_ALG_TKIP;
                keylen = 32;
                break;
        default:
                wpa_printf(MSG_WARNING, "FT: Unsupported pairwise cipher %d",
                           sm->pairwise_cipher);
                return -1;
        }

        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;
}


int wpa_ft_prepare_auth_request(struct wpa_sm *sm)
{
        u8 *ft_ies;
        size_t ft_ies_len;

        /* Generate a new SNonce */
        if (os_get_random(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);
        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 (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);
        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_CCMP ? 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);
        if (ft_ies) {
                wpa_sm_update_ft_ies(sm, sm->mobility_domain,
                                     ft_ies, ft_ies_len);
                os_free(ft_ies);
        }

        ret = wpa_ft_install_ptk(sm, bssid);

        if (ret == 0) {
                sm->ft_completed = 1;
                if (ft_action) {
                        /* TODO: trigger re-association to the Target AP;
                         * MLME is now doing this automatically, but it should
                         * really be done only if we get here successfully. */
                        os_memcpy(sm->bssid, target_ap, ETH_ALEN);
                }
        }

        return ret;
}


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;
}


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;
        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 < 10 + 24 || (gtk_elem_len - 10) % 8 ||
            gtk_elem_len - 18 > 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 - 18;
        if (aes_unwrap(sm->ptk.kek, gtk_len / 8, gtk_elem + 10, gtk)) {
                wpa_printf(MSG_WARNING, "FT: AES unwrap failed - could not "
                           "decrypt GTK");
                return -1;
        }

        switch (sm->group_cipher) {
        case WPA_CIPHER_CCMP:
                keylen = 16;
                rsc_len = 6;
                alg = WPA_ALG_CCMP;
                break;
        case WPA_CIPHER_TKIP:
                keylen = 32;
                rsc_len = 6;
                alg = WPA_ALG_TKIP;
                break;
        case WPA_CIPHER_WEP104:
                keylen = 13;
                rsc_len = 0;
                alg = WPA_ALG_WEP;
                break;
        case WPA_CIPHER_WEP40:
                keylen = 5;
                rsc_len = 0;
                alg = WPA_ALG_WEP;
                break;
        default:
                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[1] | Key Length[1] | RSC[8] | Key[5..32]. */

        keyidx = gtk_elem[0] & 0x03;

        if (gtk_elem[1] != keylen) {
                wpa_printf(MSG_DEBUG, "FT: GTK length mismatch: received %d "
                           "negotiated %lu",
                           gtk_elem[1], (unsigned long) keylen);
                return -1;
        }

        wpa_hexdump_key(MSG_DEBUG, "FT: GTK from Reassoc Resp", gtk, keylen);
        if (wpa_sm_set_key(sm, alg, (u8 *) "\xff\xff\xff\xff\xff\xff",
                           keyidx, 0, gtk_elem + 2, 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, (u8 *) "\xff\xff\xff\xff\xff\xff",
                           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;
        size_t 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 (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.tie)
                count++;

        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 (parse.ric) {
                wpa_hexdump(MSG_MSGDUMP, "FT: RIC Response",
                            parse.ric, parse.ric_len);
                /* TODO: parse response and inform driver about results */
        }

        return 0;
}


int wpa_ft_start_over_ds(struct wpa_sm *sm, const u8 *target_ap)
{
        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 (os_get_random(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);
        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 */