static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
const u8 *gtk, size_t gtk_len,
int key_info)
{
#ifndef CONFIG_NO_WPA2
struct wpa_gtk_data gd;
/*
* IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
* GTK KDE format:
* KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
* Reserved [bits 0-7]
* GTK
*/
os_memset(&gd, 0, sizeof(gd));
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake",
gtk, gtk_len);
if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
return -1;
gd.keyidx = gtk[0] & 0x3;
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(gtk[0] & BIT(2)));
gtk += 2;
gtk_len -= 2;
os_memcpy(gd.gtk, gtk, gtk_len);
gd.gtk_len = gtk_len;
if (wpa_supplicant_check_group_cipher(sm->group_cipher,
gtk_len, gtk_len,
&gd.key_rsc_len, &gd.alg) ||
wpa_supplicant_install_gtk(sm, &gd, key->key_rsc)) {
wpa_printf(MSG_DEBUG, "RSN: Failed to install GTK");
return -1;
}
wpa_supplicant_key_neg_complete(sm, sm->bssid,
key_info & WPA_KEY_INFO_SECURE);
return 0;
#else /* CONFIG_NO_WPA2 */
return -1;
#endif /* CONFIG_NO_WPA2 */
}
static int wpa_supplicant_process_1_of_2_rsn(struct wpa_sm *sm,
const u8 *keydata,
size_t keydatalen,
u16 key_info,
struct wpa_gtk_data *gd)
{
int maxkeylen;
struct wpa_eapol_ie_parse ie;
wpa_hexdump(MSG_DEBUG, "RSN: msg 1/2 key data", keydata, keydatalen);
wpa_supplicant_parse_ies(keydata, keydatalen, &ie);
if (ie.gtk && !(key_info & WPA_KEY_INFO_ENCR_KEY_DATA)) {
wpa_printf(MSG_WARNING, "WPA: GTK IE in unencrypted key data");
return -1;
}
if (ie.gtk == NULL) {
wpa_printf(MSG_INFO, "WPA: No GTK IE in Group Key msg 1/2");
return -1;
}
maxkeylen = gd->gtk_len = ie.gtk_len - 2;
if (wpa_supplicant_check_group_cipher(sm->group_cipher,
gd->gtk_len, maxkeylen,
&gd->key_rsc_len, &gd->alg))
return -1;
wpa_hexdump(MSG_DEBUG, "RSN: received GTK in group key handshake",
ie.gtk, ie.gtk_len);
gd->keyidx = ie.gtk[0] & 0x3;
gd->tx = wpa_supplicant_gtk_tx_bit_workaround(sm,
!!(ie.gtk[0] & BIT(2)));
if (ie.gtk_len - 2 > sizeof(gd->gtk)) {
wpa_printf(MSG_INFO, "RSN: Too long GTK in GTK IE "
"(len=%lu)", (unsigned long) ie.gtk_len - 2);
return -1;
}
os_memcpy(gd->gtk, ie.gtk + 2, ie.gtk_len - 2);
if (ieee80211w_set_keys(sm, &ie) < 0)
wpa_printf(MSG_INFO, "RSN: Failed to configure IGTK");
return 0;
}
static int wpa_supplicant_pairwise_gtk(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
const u8 *gtk, size_t gtk_len,
int key_info)
{
struct wpa_gtk_data gd;
/*
* IEEE Std 802.11i-2004 - 8.5.2 EAPOL-Key frames - Figure 43x
* GTK KDE format:
* KeyID[bits 0-1], Tx [bit 2], Reserved [bits 3-7]
* Reserved [bits 0-7]
* GTK
*/
//printf("wpa_supplicant_pairwise_gtk\n");
printf("gk\n");
os_memset(&gd, 0, sizeof(gd));
wpa_hexdump_key(MSG_DEBUG, "RSN: received GTK in pairwise handshake", gtk, gtk_len);
if (gtk_len < 2 || gtk_len - 2 > sizeof(gd.gtk))
return -1;
gd.keyidx = gtk[0] & 0x3;
gd.tx = wpa_supplicant_gtk_tx_bit_workaround(sm, !!(gtk[0] & BIT(2)));
gtk += 2;
gtk_len -= 2;
os_memcpy(gd.gtk, gtk, gtk_len);
gd.gtk_len = gtk_len;
if (wpa_supplicant_check_group_cipher(sm->group_cipher, gtk_len, gtk_len, &gd.key_rsc_len, &gd.alg)
|| wpa_supplicant_install_gtk(sm, &gd, key->key_rsc))
{
printf("RSN: Failed to install GTK\n");
return -1;
}
return 0;
}
static int wpa_supplicant_process_1_of_2_wpa(struct wpa_sm *sm,
const struct wpa_eapol_key *key,
size_t keydatalen, int key_info,
size_t extra_len, u16 ver,
struct wpa_gtk_data *gd)
{
size_t maxkeylen;
u8 ek[32];
gd->gtk_len = WPA_GET_BE16(key->key_length);
maxkeylen = keydatalen;
if (keydatalen > extra_len) {
wpa_printf(MSG_INFO, "WPA: Truncated EAPOL-Key packet:"
" key_data_length=%lu > extra_len=%lu",
(unsigned long) keydatalen,
(unsigned long) extra_len);
return -1;
}
if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
if (maxkeylen < 8) {
wpa_printf(MSG_INFO, "WPA: Too short maxkeylen (%lu)",
(unsigned long) maxkeylen);
return -1;
}
maxkeylen -= 8;
}
if (wpa_supplicant_check_group_cipher(sm->group_cipher,
gd->gtk_len, maxkeylen,
&gd->key_rsc_len, &gd->alg))
return -1;
gd->keyidx = (key_info & WPA_KEY_INFO_KEY_INDEX_MASK) >>
WPA_KEY_INFO_KEY_INDEX_SHIFT;
if (ver == WPA_KEY_INFO_TYPE_HMAC_MD5_RC4) {
os_memcpy(ek, key->key_iv, 16);
os_memcpy(ek + 16, sm->ptk.kek, 16);
if (keydatalen > sizeof(gd->gtk)) {
wpa_printf(MSG_WARNING, "WPA: RC4 key data "
"too long (%lu)",
(unsigned long) keydatalen);
return -1;
}
os_memcpy(gd->gtk, key + 1, keydatalen);
if (rc4_skip(ek, 32, 256, gd->gtk, keydatalen)) {
wpa_printf(MSG_ERROR, "WPA: RC4 failed");
return -1;
}
} else if (ver == WPA_KEY_INFO_TYPE_HMAC_SHA1_AES) {
if (keydatalen % 8) {
wpa_printf(MSG_WARNING, "WPA: Unsupported AES-WRAP "
"len %lu", (unsigned long) keydatalen);
return -1;
}
if (maxkeylen > sizeof(gd->gtk)) {
wpa_printf(MSG_WARNING, "WPA: AES-WRAP key data "
"too long (keydatalen=%lu maxkeylen=%lu)",
(unsigned long) keydatalen,
(unsigned long) maxkeylen);
return -1;
}
if (aes_unwrap(sm->ptk.kek, maxkeylen / 8,
(const u8 *) (key + 1), gd->gtk)) {
wpa_printf(MSG_WARNING, "WPA: AES unwrap "
"failed - could not decrypt GTK");
return -1;
}
} else {
wpa_printf(MSG_WARNING, "WPA: Unsupported key_info type %d",
ver);
return -1;
}
gd->tx = wpa_supplicant_gtk_tx_bit_workaround(
sm, !!(key_info & WPA_KEY_INFO_TXRX));
return 0;
}
