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sae: support reception of Confirm frame by AP

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Experimental AP-mode support for receiving a Confirm frame when in the
COMMITTED state. The AP will reply with a Confirm frame.

Note that when acting as an AP, on reception of a Commit frame, the AP
only replies with a Commit frame. The protocols allows to also already
send the Confirm frame, but older clients may not support simultaneously
receiving a Commit and Confirm frame.
This commit is contained in:
John Brandt 2024-05-05 17:30:31 -07:00 committed by Denis Kenzior
parent 2e80a09184
commit b9e4dfbd40
1 changed files with 39 additions and 13 deletions
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42
src/sae.c
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@ -887,9 +887,14 @@ static int sae_process_confirm(struct sae_sm *sm, const uint8_t *from,
sm->state = SAE_STATE_ACCEPTED;
sae_debug("Sending Associate to "MAC, MAC_STR(sm->handshake->aa));
if (!sm->handshake->authenticator) {
sae_debug("Sending Associate to "
MAC, MAC_STR(sm->handshake->aa));
sm->tx_assoc(sm->user_data);
} else {
if (!sae_send_confirm(sm))
return -EPROTO;
}
return 0;
}
@ -1039,16 +1044,37 @@ static int sae_verify_committed(struct sae_sm *sm, uint16_t transaction,
unsigned int skip;
struct ie_tlv_iter iter;
if (sm->handshake->authenticator &&
transaction == SAE_STATE_CONFIRMED) {
enum l_checksum_type hash =
crypto_sae_hash_from_ecc_prime_len(sm->sae_type,
l_ecc_curve_get_scalar_bytes(sm->curve));
size_t hash_len = l_checksum_digest_length(hash);
if (len < hash_len + 2) {
l_error("SAE: Confirm packet too short");
return -EBADMSG;
}
/*
* TODO: Add extra functionality such as supporting
* anti-clogging tokens and tracking rejected groups. Note
* that the cryptographic confirm field value will be checked
* at a later point.
*/
return 0;
} else if (transaction == SAE_STATE_CONFIRMED) {
/*
* Upon receipt of a Con event...
* Then the protocol instance checks the value of Sync. If it
* is greater than dot11RSNASAESync, the protocol instance shall send a
* Del event to the parent process and transition back to Nothing state.
* If Sync is not greater than dot11RSNASAESync, the protocol instance
* shall increment Sync, transmit the last SAE Commit message sent to
* the peer...
* is greater than dot11RSNASAESync, the protocol instance
* shall send a Del event to the parent process and transition
* back to Nothing state.
* If Sync is not greater than dot11RSNASAESync, the protocol
* instance shall increment Sync, transmit the last SAE Commit
* message sent to the peer...
*/
if (transaction == SAE_STATE_CONFIRMED) {
if (sm->sync > SAE_SYNC_MAX)
return -ETIMEDOUT;