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eapol: Basic EAP support in authenticator mode

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Handle EAPoL-EAP frames using our eap.c methods in authenticator mode
same as we do on the supplicant side.  The user (ap.c) will only need to
set a valid 8021x_settings in the handshake object, same as on the
supplicant side.
This commit is contained in:
Andrew Zaborowski 2020-08-17 12:06:41 +02:00 committed by Denis Kenzior
parent 17c569ba4c
commit 4c64e0d560
1 changed files with 49 additions and 6 deletions
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55
src/eapol.c
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@ -876,7 +876,7 @@ struct eapol_sm *eapol_sm_new(struct handshake_state *hs)
sm->handshake = hs;
if (hs->settings_8021x)
if (hs->settings_8021x && !hs->authenticator)
sm->use_eapol_start = true;
sm->require_handshake = true;
@ -2074,6 +2074,18 @@ static void eapol_eap_complete_cb(enum eap_result result, void *user_data)
}
eap_reset(sm->eap);
if (sm->handshake->authenticator) {
if (L_WARN_ON(!sm->handshake->have_pmk)) {
handshake_failed(sm, MMPDU_REASON_CODE_UNSPECIFIED);
return;
}
/* sm->mic_len will have been set in eapol_eap_results_cb */
/* Kick off 4-Way Handshake */
eapol_ptk_1_of_4_retry(NULL, sm);
}
}
/* This respresentes the eapResults message */
@ -2209,7 +2221,34 @@ static void eapol_rx_auth_packet(uint16_t proto, const uint8_t *from,
{
struct eapol_sm *sm = user_data;
if (proto != ETH_P_PAE || memcmp(from, sm->handshake->spa, 6))
return;
switch (frame->header.packet_type) {
case 0: /* EAPOL-EAP */
if (!sm->eap) {
l_error("Authenticator received an unexpected "
"EAPOL-EAP frame from %s",
util_address_to_string(from));
return;
}
eap_rx_packet(sm->eap, frame->data,
L_BE16_TO_CPU(frame->header.packet_len));
break;
case 1: /* EAPOL-Start */
/*
* The supplicant might have sent an EAPoL-Start even before
* we queued our EAP Identity Request, so this should happen
* mostly while we wait for the EAP Identity Response or before.
* It's safe to ignore this frame in either case.
*
* TODO: if we're already past the full handshake, send a
* new msg 1/4.
*/
break;
case 3: /* EAPOL-Key */
eapol_auth_key_handle(sm, frame);
break;
@ -2396,14 +2435,18 @@ bool eapol_start(struct eapol_sm *sm)
}
if (sm->handshake->authenticator) {
if (L_WARN_ON(!sm->handshake->have_pmk))
return false;
if (!sm->protocol_version)
sm->protocol_version = EAPOL_PROTOCOL_VERSION_2004;
/* Kick off handshake */
eapol_ptk_1_of_4_retry(NULL, sm);
if (sm->handshake->settings_8021x)
eap_start(sm->eap);
else {
if (L_WARN_ON(!sm->handshake->have_pmk))
return false;
/* Kick off handshake */
eapol_ptk_1_of_4_retry(NULL, sm);
}
}
return true;