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eapol: Handle Step 2 & 4 of the 4-way Handshake

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This commit is contained in:
Denis Kenzior 2015-02-24 11:14:11 -06:00
parent da1180841d
commit f997816a7f
1 changed files with 48 additions and 0 deletions
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48
src/eapol.c
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@ -527,6 +527,54 @@ fail:
l_free(step2);
}
static void eapol_handle_ptk_3_of_4(int ifindex, struct eapol_sm *sm,
const struct eapol_key *ek,
const uint8_t *decrypted_key_data)
{
struct crypto_ptk *ptk = (struct crypto_ptk *) sm->ptk;
struct eapol_key *step4;
uint8_t mic[16];
if (!eapol_verify_ptk_3_of_4(ek))
return;
/*
* 11.6.6.4: "On reception of Message 3, the Supplicant silently
* discards the message if ... or if the ANonce value in Message 3
* differs from the ANonce value in Message 1"
*/
if (memcmp(sm->anonce, ek->key_nonce, sizeof(ek->key_nonce)))
return;
/*
* TODO: Check that first RSNE matches ap_rsne
* 11.6.6.4: "Verifies the RSNE. If it is part of a Fast BSS Transition
* Initial Mobility Domain Association, see 12.4.2. Otherwise, if it is
* not identical to that the STA received in the Beacon or Probe
* Response frame, the STA shall disassociate.
*/
/*
* TODO: Parse second RSNE
* 11.6.6.4: "If a second RSNE is provided in the message, the
* Supplicant uses the pairwise cipher suite specified in the second
* RSNE or deauthenticates."
*/
step4 = eapol_create_ptk_4_of_4(protocol_version,
ek->key_descriptor_version,
sm->replay_counter);
if (!eapol_calculate_mic(ptk->kck, step4, mic))
goto fail;
memcpy(step4->key_mic_data, mic, sizeof(mic));
tx_packet(ifindex, sm->aa_addr, sm->sta_addr, step4);
fail:
l_free(step4);
}
void __eapol_rx_packet(int ifindex, const uint8_t *sta_addr,
const uint8_t *aa_addr,
const uint8_t *frame, size_t len)