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eapol: IP Allocation KDE support authenticator side

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Again the hs->support_ip_allocation flag is used for two purposes here,
first the user signals whether to support this mechanism through this
flag, then it reads the flag to find out if an IP was allocated.
This commit is contained in:
Andrew Zaborowski 2020-09-14 15:51:17 +02:00 committed by Denis Kenzior
parent ddf111d2c4
commit 159afd7f18
1 changed files with 31 additions and 1 deletions
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32
src/eapol.c
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@ -1322,6 +1322,21 @@ static void eapol_send_ptk_3_of_4(struct eapol_sm *sm)
key_data_len += gtk_kde[1] + 2;
}
if (sm->handshake->support_ip_allocation) {
/* Wi-Fi P2P Technical Specification v1.7 Table 59 */
key_data_buf[key_data_len++] = IE_TYPE_VENDOR_SPECIFIC;
key_data_buf[key_data_len++] = 4 + 12;
l_put_be32(HANDSHAKE_KDE_IP_ADDRESS_ALLOC,
key_data_buf + key_data_len + 0);
l_put_be32(sm->handshake->client_ip_addr,
key_data_buf + key_data_len + 4);
l_put_be32(sm->handshake->subnet_mask,
key_data_buf + key_data_len + 8);
l_put_be32(sm->handshake->go_ip_addr,
key_data_buf + key_data_len + 12);
key_data_len += 4 + 12;
}
kek = handshake_state_get_kek(sm->handshake);
key_data_len = eapol_encrypt_key_data(kek, key_data_buf,
key_data_len, ek, sm->mic_len);
@ -1450,11 +1465,26 @@ static void eapol_handle_ptk_2_of_4(struct eapol_sm *sm,
if (!rsne || rsne[1] != sm->handshake->supplicant_ie[1] ||
memcmp(rsne + 2, sm->handshake->supplicant_ie + 2,
rsne[1])) {
handshake_failed(sm, MMPDU_REASON_CODE_IE_DIFFERENT);
return;
}
if (sm->handshake->support_ip_allocation) {
const uint8_t *ip_req_kde =
eapol_find_wfa_kde(EAPOL_KEY_DATA(ek, sm->mic_len),
EAPOL_KEY_DATA_LEN(ek, sm->mic_len),
HANDSHAKE_KDE_IP_ADDRESS_REQ & 255);
if (ip_req_kde &&
(ip_req_kde[1] < 5 || ip_req_kde[6] != 0x01)) {
l_debug("Invalid IP Address Request KDE in frame 2/4");
handshake_failed(sm, MMPDU_REASON_CODE_INVALID_IE);
return;
}
sm->handshake->support_ip_allocation = ip_req_kde != NULL;
}
memcpy(sm->handshake->snonce, ek->key_nonce,
sizeof(sm->handshake->snonce));
sm->handshake->have_snonce = true;