RSN: Split EAPOL-Key group msg 1/2 processing more completely for WPA(v1)
Separate more of WPA(v1) functionality away from the RSN processing code path. Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen
parent
5ab43c738e
commit
e5dfce38f7
7 changed files with 236 additions and 217 deletions
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@ -2529,173 +2529,6 @@ failed:
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}
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static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
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const u8 *keydata,
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size_t keydatalen,
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u16 key_info,
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struct wpa_gtk_data *gd)
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{
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int maxkeylen;
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struct wpa_eapol_ie_parse ie;
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u16 gtk_len;
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wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data",
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keydata, keydatalen);
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if (wpa_supplicant_parse_ies(keydata, keydatalen, &ie) < 0)
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return -1;
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if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: GTK IE in unencrypted key data");
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return -1;
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}
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if (ie.gtk == NULL) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"WPA: No GTK IE in Group Key msg 1/2");
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return -1;
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}
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gtk_len = ie.gtk_len;
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if (gtk_len < 2) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Invalid GTK KDE length (%u) in Group Key msg 1/2",
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gtk_len);
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return -1;
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}
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gtk_len -= 2;
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if (gtk_len > sizeof(gd->gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Too long GTK in GTK KDE (len=%u)", gtk_len);
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return -1;
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}
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maxkeylen = gd->gtk_len = gtk_len;
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#ifdef CONFIG_OCV
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if (wpa_sm_ocv_enabled(sm)) {
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struct wpa_channel_info ci;
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if (wpa_sm_channel_info(sm, &ci) != 0) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"Failed to get channel info to validate received OCI in EAPOL-Key group msg 1/2");
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return -1;
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}
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if (ocv_verify_tx_params(ie.oci, ie.oci_len, &ci,
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channel_width_to_int(ci.chanwidth),
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ci.seg1_idx) != OCI_SUCCESS) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
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"addr=" MACSTR " frame=eapol-key-g1 error=%s",
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MAC2STR(sm->bssid), ocv_errorstr);
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return -1;
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}
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}
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#endif /* CONFIG_OCV */
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if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
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gtk_len, maxkeylen,
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&gd->key_rsc_len, &gd->alg))
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return -1;
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wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake",
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ie.gtk, 2 + gtk_len);
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gd->keyidx = ie.gtk[0] & 0x3;
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gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
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!!(ie.gtk[0] & BIT(2)));
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os_memcpy(gd->gtk, ie.gtk + 2, gtk_len);
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if (ieee80211w_set_keys(sm, &ie) < 0)
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Failed to configure IGTK");
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return 0;
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}
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static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
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const struct wpa_eapol_key *key,
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const u8 *key_data,
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size_t key_data_len, u16 key_info,
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u16 ver, struct wpa_gtk_data *gd)
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{
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size_t maxkeylen;
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u16 gtk_len;
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gtk_len = WPA_GET_BE16(key->key_length);
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maxkeylen = key_data_len;
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if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
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if (maxkeylen < 8) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"WPA: Too short maxkeylen (%lu)",
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(unsigned long) maxkeylen);
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return -1;
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}
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maxkeylen -= 8;
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}
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if (gtk_len > maxkeylen ||
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wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
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gtk_len, maxkeylen,
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&gd->key_rsc_len, &gd->alg))
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return -1;
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gd->gtk_len = gtk_len;
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gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
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WPA_KEY_INFO_KEY_INDEX_SHIFT;
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if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
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#if defined(CONFIG_NO_RC4) || defined(CONFIG_FIPS)
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: RC4 not supported in the build");
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return -1;
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#else /* CONFIG_NO_RC4 || CONFIG_FIPS */
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u8 ek[32];
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if (key_data_len > sizeof(gd->gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: RC4 key data too long (%lu)",
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(unsigned long) key_data_len);
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return -1;
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}
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os_memcpy(ek, key->key_iv, 16);
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os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
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os_memcpy(gd->gtk, key_data, key_data_len);
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if (rc4_skip(ek, 32, 256, gd->gtk, key_data_len)) {
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forced_memzero(ek, sizeof(ek));
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wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
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"WPA: RC4 failed");
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return -1;
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}
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forced_memzero(ek, sizeof(ek));
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#endif /* CONFIG_NO_RC4 || CONFIG_FIPS */
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} else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
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if (maxkeylen % 8) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: Unsupported AES-WRAP len %lu",
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(unsigned long) maxkeylen);
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return -1;
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}
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if (maxkeylen > sizeof(gd->gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: AES-WRAP key data "
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"too long (keydatalen=%lu maxkeylen=%lu)",
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(unsigned long) key_data_len,
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(unsigned long) maxkeylen);
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return -1;
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}
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if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, maxkeylen / 8,
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key_data, gd->gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: AES unwrap failed - could not decrypt "
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"GTK");
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return -1;
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}
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} else {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: Unsupported key_info type %d", ver);
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return -1;
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}
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gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
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sm, !!(key_info & WPA_KEY_INFO_TXRX));
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return 0;
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}
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static int wpa_supplicant_send_2_of_2(struct wpa_sm *sm,
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const struct wpa_eapol_key *key,
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int ver, u16 key_info)
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@ -2879,18 +2712,20 @@ failed:
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}
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static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
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const unsigned char *src_addr,
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const struct wpa_eapol_key *key,
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const u8 *key_data,
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size_t key_data_len, u16 ver)
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static void wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
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const unsigned char *src_addr,
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const struct wpa_eapol_key *key,
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const u8 *key_data,
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size_t key_data_len, u16 ver)
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{
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u16 key_info;
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int rekey, ret;
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int rekey;
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struct wpa_gtk_data gd;
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const u8 *key_rsc;
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size_t maxkeylen;
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u16 gtk_len;
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if (!sm->msg_3_of_4_ok && !wpa_fils_is_completed(sm)) {
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if (!sm->msg_3_of_4_ok) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"WPA: Group Key Handshake started prior to completion of 4-way handshake");
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goto failed;
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@ -2899,25 +2734,88 @@ static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
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os_memset(&gd, 0, sizeof(gd));
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rekey = wpa_sm_get_state(sm) == WPA_COMPLETED;
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wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG, "WPA: RX message 1 of Group Key "
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"Handshake from " MACSTR " (ver=%d)", MAC2STR(src_addr), ver);
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wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
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"WPA: RX message 1 of Group Key Handshake from " MACSTR
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" (ver=%d)", MAC2STR(src_addr), ver);
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key_info = WPA_GET_BE16(key->key_info);
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if (sm->proto == WPA_PROTO_RSN || sm->proto == WPA_PROTO_OSEN) {
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ret = wpa_supplicant_process_1_of_2_rsn(sm, key_data,
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key_data_len, key_info,
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&gd);
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} else {
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ret = wpa_supplicant_process_1_of_2_wpa(sm, key, key_data,
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key_data_len,
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key_info, ver, &gd);
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gtk_len = WPA_GET_BE16(key->key_length);
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maxkeylen = key_data_len;
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if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
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if (maxkeylen < 8) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"WPA: Too short maxkeylen (%lu)",
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(unsigned long) maxkeylen);
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goto failed;
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}
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maxkeylen -= 8;
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}
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if (gtk_len > maxkeylen ||
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wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
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gtk_len, maxkeylen,
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&gd.key_rsc_len, &gd.alg))
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goto failed;
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wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
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if (ret)
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gd.gtk_len = gtk_len;
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gd.keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
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WPA_KEY_INFO_KEY_INDEX_SHIFT;
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if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4 && sm->ptk.kek_len == 16) {
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#if defined(CONFIG_NO_RC4) || defined(CONFIG_FIPS)
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: RC4 not supported in the build");
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goto failed;
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#else /* CONFIG_NO_RC4 || CONFIG_FIPS */
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u8 ek[32];
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if (key_data_len > sizeof(gd.gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: RC4 key data too long (%lu)",
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(unsigned long) key_data_len);
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goto failed;
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}
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os_memcpy(ek, key->key_iv, 16);
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os_memcpy(ek + 16, sm->ptk.kek, sm->ptk.kek_len);
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os_memcpy(gd.gtk, key_data, key_data_len);
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if (rc4_skip(ek, 32, 256, gd.gtk, key_data_len)) {
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forced_memzero(ek, sizeof(ek));
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wpa_msg(sm->ctx->msg_ctx, MSG_ERROR,
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"WPA: RC4 failed");
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goto failed;
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}
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forced_memzero(ek, sizeof(ek));
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#endif /* CONFIG_NO_RC4 || CONFIG_FIPS */
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} else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
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if (maxkeylen % 8) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: Unsupported AES-WRAP len %lu",
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(unsigned long) maxkeylen);
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goto failed;
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}
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if (maxkeylen > sizeof(gd.gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: AES-WRAP key data "
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"too long (keydatalen=%lu maxkeylen=%lu)",
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(unsigned long) key_data_len,
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(unsigned long) maxkeylen);
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goto failed;
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}
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if (aes_unwrap(sm->ptk.kek, sm->ptk.kek_len, maxkeylen / 8,
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key_data, gd.gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: AES unwrap failed - could not decrypt "
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"GTK");
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goto failed;
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}
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} else {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"WPA: Unsupported key_info type %d", ver);
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goto failed;
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}
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gd.tx = wpa_supplicant_gtk_tx_bit_workaround(
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sm, !!(key_info & WPA_KEY_INFO_TXRX));
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key_rsc = key->key_rsc;
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if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
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@ -2929,15 +2827,15 @@ static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
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forced_memzero(&gd, sizeof(gd));
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if (rekey) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO, "WPA: Group rekeying "
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"completed with " MACSTR " [GTK=%s]",
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"WPA: Group rekeying completed with " MACSTR
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" [GTK=%s]",
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MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
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wpa_sm_cancel_auth_timeout(sm);
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wpa_sm_set_state(sm, WPA_COMPLETED);
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} else {
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wpa_supplicant_key_neg_complete(sm, sm->bssid,
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key_info &
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WPA_KEY_INFO_SECURE);
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key_info & WPA_KEY_INFO_SECURE);
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}
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wpa_sm_set_rekey_offload(sm);
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@ -2950,6 +2848,127 @@ failed:
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}
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static void wpa_supplicant_process_1_of_2(struct wpa_sm *sm,
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const unsigned char *src_addr,
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const struct wpa_eapol_key *key,
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const u8 *key_data,
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size_t key_data_len, u16 ver)
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{
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u16 key_info;
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struct wpa_gtk_data gd;
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const u8 *key_rsc;
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int maxkeylen;
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struct wpa_eapol_ie_parse ie;
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u16 gtk_len;
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if (!sm->msg_3_of_4_ok && !wpa_fils_is_completed(sm)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Group Key Handshake started prior to completion of 4-way handshake");
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goto failed;
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}
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os_memset(&gd, 0, sizeof(gd));
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wpa_dbg(sm->ctx->msg_ctx, MSG_DEBUG,
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"RSN: RX message 1 of Group Key Handshake from " MACSTR
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" (ver=%d)", MAC2STR(src_addr), ver);
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key_info = WPA_GET_BE16(key->key_info);
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wpa_hexdump_key(MSG_DEBUG, "RSN: msg 1/2 key data",
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key_data, key_data_len);
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if (wpa_supplicant_parse_ies(key_data, key_data_len, &ie) < 0)
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goto failed;
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wpa_sm_set_state(sm, WPA_GROUP_HANDSHAKE);
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if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"RSN: GTK KDE in unencrypted key data");
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goto failed;
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}
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if (!ie.gtk) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: No GTK KDE in Group Key msg 1/2");
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goto failed;
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}
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gtk_len = ie.gtk_len;
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if (gtk_len < 2) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Invalid GTK KDE length (%u) in Group Key msg 1/2",
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gtk_len);
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goto failed;
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}
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gtk_len -= 2;
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if (gtk_len > sizeof(gd.gtk)) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
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"RSN: Too long GTK in GTK KDE (len=%u)", gtk_len);
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goto failed;
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}
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maxkeylen = gd.gtk_len = gtk_len;
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#ifdef CONFIG_OCV
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if (wpa_sm_ocv_enabled(sm)) {
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struct wpa_channel_info ci;
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if (wpa_sm_channel_info(sm, &ci) != 0) {
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wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
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"Failed to get channel info to validate received OCI in EAPOL-Key group msg 1/2");
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goto failed;
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}
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if (ocv_verify_tx_params(ie.oci, ie.oci_len, &ci,
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channel_width_to_int(ci.chanwidth),
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ci.seg1_idx) != OCI_SUCCESS) {
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wpa_msg(sm->ctx->msg_ctx, MSG_INFO, OCV_FAILURE
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"addr=" MACSTR " frame=eapol-key-g1 error=%s",
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MAC2STR(sm->bssid), ocv_errorstr);
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goto failed;
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}
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}
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#endif /* CONFIG_OCV */
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|
||||
if (wpa_supplicant_check_group_cipher(sm, sm->group_cipher,
|
||||
gtk_len, maxkeylen,
|
||||
&gd.key_rsc_len, &gd.alg))
|
||||
goto failed;
|
||||
|
||||
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in group key handshake",
|
||||
ie.gtk, 2 + gtk_len);
|
||||
gd.keyidx = ie.gtk[0] & 0x3;
|
||||
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
|
||||
!!(ie.gtk[0] & BIT(2)));
|
||||
os_memcpy(gd.gtk, ie.gtk + 2, gtk_len);
|
||||
|
||||
if (ieee80211w_set_keys(sm, &ie) < 0)
|
||||
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
|
||||
"RSN: Failed to configure IGTK");
|
||||
|
||||
key_rsc = key->key_rsc;
|
||||
if (wpa_supplicant_rsc_relaxation(sm, key->key_rsc))
|
||||
key_rsc = null_rsc;
|
||||
|
||||
if (wpa_supplicant_install_gtk(sm, &gd, key_rsc, 0) ||
|
||||
wpa_supplicant_send_2_of_2(sm, key, ver, key_info) < 0)
|
||||
goto failed;
|
||||
forced_memzero(&gd, sizeof(gd));
|
||||
|
||||
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
|
||||
"RSN: Group rekeying completed with " MACSTR " [GTK=%s]",
|
||||
MAC2STR(sm->bssid), wpa_cipher_txt(sm->group_cipher));
|
||||
wpa_sm_cancel_auth_timeout(sm);
|
||||
wpa_sm_set_state(sm, WPA_COMPLETED);
|
||||
|
||||
wpa_sm_set_rekey_offload(sm);
|
||||
|
||||
return;
|
||||
|
||||
failed:
|
||||
forced_memzero(&gd, sizeof(gd));
|
||||
wpa_sm_deauthenticate(sm, WLAN_REASON_UNSPECIFIED);
|
||||
}
|
||||
|
||||
|
||||
static int wpa_supplicant_verify_eapol_key_mic(struct wpa_sm *sm,
|
||||
struct wpa_eapol_key *key,
|
||||
u16 ver,
|
||||
|
|
@ -3318,10 +3337,10 @@ static int wpa_sm_rx_eapol_wpa(struct wpa_sm *sm, const u8 *src_addr,
|
|||
} else {
|
||||
if (key_info & WPA_KEY_INFO_MIC) {
|
||||
/* 1/2 Group Key Handshake */
|
||||
wpa_supplicant_process_1_of_2(sm, src_addr, key,
|
||||
key_data,
|
||||
key_data_len,
|
||||
ver);
|
||||
wpa_supplicant_process_1_of_2_wpa(sm, src_addr, key,
|
||||
key_data,
|
||||
key_data_len,
|
||||
ver);
|
||||
} else {
|
||||
wpa_msg(sm->ctx->msg_ctx, MSG_WARNING,
|
||||
"WPA: EAPOL-Key (Group) without Mic/Encr bit - dropped");
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue