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eapol: Add __eapol_rx_packet

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This commit is contained in:
Denis Kenzior 2015-02-24 11:13:19 -06:00
parent 4a540526fe
commit 9e6cbc5b60
2 changed files with 84 additions and 0 deletions
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80
src/eapol.c
View File

@ -488,6 +488,86 @@ void eapol_start(int ifindex, struct eapol_sm *sm)
l_hashmap_insert(state_machines, L_UINT_TO_PTR(ifindex), sm);
}
void __eapol_rx_packet(int ifindex, const uint8_t *sta_addr,
const uint8_t *aa_addr,
const uint8_t *frame, size_t len)
{
const struct eapol_key *ek;
struct eapol_sm *sm;
struct crypto_ptk *ptk;
uint8_t *decrypted_key_data = NULL;
uint64_t replay_counter;
ek = eapol_key_validate(frame, len);
if (!ek)
return;
sm = l_hashmap_lookup(state_machines, L_UINT_TO_PTR(ifindex));
if (!sm)
return;
if (memcmp(sm->sta_addr, sta_addr, sizeof(sm->sta_addr)))
return;
if (memcmp(sm->aa_addr, aa_addr, sizeof(sm->aa_addr)))
return;
/* Wrong direction */
if (!ek->key_ack)
return;
replay_counter = L_BE64_TO_CPU(ek->key_replay_counter);
/*
* 11.6.6.2: "If the Key Replay Counter field value is less than or
* equal to the current local value, the Supplicant discards the
* message.
*
* 11.6.6.4: "On reception of Message 3, the Supplicant silently
* discards the message if the Key Replay Counter field value has
* already been used...
*/
if (sm->have_replay && sm->replay_counter >= replay_counter)
return;
sm->replay_counter = replay_counter;
sm->have_replay = true;
ptk = (struct crypto_ptk *) sm->ptk;
if (ek->key_mic) {
/* Haven't received step 1 yet, so no ptk */
if (!sm->have_snonce)
return;
if (!eapol_verify_mic(ptk->kck, ek))
return;
}
if (ek->encrypted_key_data) {
/* Haven't received step 1 yet, so no ptk */
if (!sm->have_snonce)
return;
decrypted_key_data = eapol_decrypt_key_data(ptk->kek, ek);
if (!decrypted_key_data)
return;
}
/* TODO: Handle Group Key Handshake */
if (ek->key_type == 0)
goto done;
/* If no MIC, then assume packet 1, otherwise packet 3 */
if (!ek->key_mic)
eapol_handle_ptk_1_of_4(ifindex, sm, ek);
else
eapol_handle_ptk_3_of_4(ifindex, sm, ek, decrypted_key_data);
done:
l_free(decrypted_key_data);
}
void __eapol_set_tx_packet_func(eapol_tx_packet_func_t func)
{
tx_packet = func;

4
src/eapol.h
View File

@ -127,6 +127,10 @@ struct eapol_key *eapol_create_ptk_4_of_4(
enum eapol_key_descriptor_version version,
uint64_t key_replay_counter);
void __eapol_rx_packet(int ifindex, const uint8_t *sta_addr,
const uint8_t *aa_addr,
const uint8_t *frame, size_t len);
void __eapol_set_tx_packet_func(eapol_tx_packet_func_t func);
void __eapol_set_get_nonce_func(eapol_get_nonce_func_t func);
void __eapol_set_protocol_version(enum eapol_protocol_version version);