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eapol: detect message 2/4 retransmits

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If the authenticator has already set an snonce then the packet must
be a retransmit. Handle this by sending 3/4 again but making sure
to not reset the frame counter.
This commit is contained in:
James Prestwood 2023-01-12 11:32:10 -08:00 committed by Denis Kenzior
parent 0930d0dffc
commit c31ae041a2
1 changed files with 8 additions and 2 deletions
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10
src/eapol.c
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@ -1606,12 +1606,18 @@ static void eapol_handle_ptk_2_of_4(struct eapol_sm *sm,
sm->handshake->support_ip_allocation = ip_req_kde != NULL; sm->handshake->support_ip_allocation = ip_req_kde != NULL;
} }
/*
* If the snonce is already set don't reset the retry counter as this
* is a rekey. To be safe take the most recent snonce (in this frame)
* in case the station created a new one.
*/
if (!sm->handshake->have_snonce)
sm->frame_retry = 0;
memcpy(sm->handshake->snonce, ek->key_nonce, memcpy(sm->handshake->snonce, ek->key_nonce,
sizeof(sm->handshake->snonce)); sizeof(sm->handshake->snonce));
sm->handshake->have_snonce = true; sm->handshake->have_snonce = true;
sm->frame_retry = 0;
eapol_ptk_3_of_4_retry(NULL, sm); eapol_ptk_3_of_4_retry(NULL, sm);
} }