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eapol: Use a separate hs variable

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Instead of using sm->handshake everywhere, use a short-hand hs variable.
This makes some lines a bit more readable.  No functional changes.
This commit is contained in:
Denis Kenzior 2021-07-13 18:29:54 -05:00
parent 10fd485d7d
commit 1a7c5786f6
1 changed files with 35 additions and 40 deletions
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69
src/eapol.c
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@ -1558,6 +1558,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
size_t decrypted_key_data_size, size_t decrypted_key_data_size,
bool unencrypted) bool unencrypted)
{ {
struct handshake_state *hs = sm->handshake;
const uint8_t *kck; const uint8_t *kck;
const uint8_t *kek; const uint8_t *kek;
struct eapol_key *step4; struct eapol_key *step4;
@ -1571,9 +1572,9 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
uint8_t gtk_key_index; uint8_t gtk_key_index;
uint16_t igtk_key_index; uint16_t igtk_key_index;
l_debug("ifindex=%u", sm->handshake->ifindex); l_debug("ifindex=%u", hs->ifindex);
if (!eapol_verify_ptk_3_of_4(ek, sm->handshake->wpa_ie, sm->mic_len)) { if (!eapol_verify_ptk_3_of_4(ek, hs->wpa_ie, sm->mic_len)) {
handshake_failed(sm, MMPDU_REASON_CODE_UNSPECIFIED); handshake_failed(sm, MMPDU_REASON_CODE_UNSPECIFIED);
return; return;
} }
@ -1585,7 +1586,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
* or if the ANonce value in message 3 differs from the ANonce value * or if the ANonce value in message 3 differs from the ANonce value
* in message 1." * in message 1."
*/ */
if (memcmp(sm->handshake->anonce, ek->key_nonce, sizeof(ek->key_nonce))) if (memcmp(hs->anonce, ek->key_nonce, sizeof(ek->key_nonce)))
return; return;
/* /*
@ -1594,10 +1595,10 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
* not identical to that the STA received in the Beacon or Probe * not identical to that the STA received in the Beacon or Probe
* Response frame, the STA shall disassociate. * Response frame, the STA shall disassociate.
*/ */
if (sm->handshake->wpa_ie) if (hs->wpa_ie)
rsne = eapol_find_wpa_ie(decrypted_key_data, rsne = eapol_find_wpa_ie(decrypted_key_data,
decrypted_key_data_size); decrypted_key_data_size);
else if (sm->handshake->osen_ie) else if (hs->osen_ie)
rsne = eapol_find_wfa_kde(decrypted_key_data, rsne = eapol_find_wfa_kde(decrypted_key_data,
decrypted_key_data_size, decrypted_key_data_size,
IE_WFA_OI_OSEN); IE_WFA_OI_OSEN);
@ -1609,24 +1610,24 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
if (!rsne) if (!rsne)
goto error_ie_different; goto error_ie_different;
if (!handshake_util_ap_ie_matches(rsne, sm->handshake->authenticator_ie, if (!handshake_util_ap_ie_matches(rsne, hs->authenticator_ie,
sm->handshake->wpa_ie)) hs->wpa_ie))
goto error_ie_different; goto error_ie_different;
if (sm->handshake->akm_suite & if (hs->akm_suite &
(IE_RSN_AKM_SUITE_FT_OVER_8021X | (IE_RSN_AKM_SUITE_FT_OVER_8021X |
IE_RSN_AKM_SUITE_FT_USING_PSK | IE_RSN_AKM_SUITE_FT_USING_PSK |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)) { IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)) {
struct ie_tlv_iter iter; struct ie_tlv_iter iter;
struct ie_rsn_info ie_info; struct ie_rsn_info ie_info;
const uint8_t *mde = sm->handshake->mde; const uint8_t *mde = hs->mde;
const uint8_t *fte = sm->handshake->fte; const uint8_t *fte = hs->fte;
if (ie_parse_rsne_from_data(rsne, rsne[1] + 2, &ie_info) < 0) if (ie_parse_rsne_from_data(rsne, rsne[1] + 2, &ie_info) < 0)
goto error_ie_different; goto error_ie_different;
if (ie_info.num_pmkids != 1 || memcmp(ie_info.pmkids, if (ie_info.num_pmkids != 1 || memcmp(ie_info.pmkids,
sm->handshake->pmk_r1_name, 16)) hs->pmk_r1_name, 16))
goto error_ie_different; goto error_ie_different;
ie_tlv_iter_init(&iter, decrypted_key_data, ie_tlv_iter_init(&iter, decrypted_key_data,
@ -1656,7 +1657,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
* and we wouldn't get here. Skip processing the rest of the message * and we wouldn't get here. Skip processing the rest of the message
* and send our reply. Do not install the keys again. * and send our reply. Do not install the keys again.
*/ */
if (sm->handshake->ptk_complete) if (hs->ptk_complete)
goto retransmit; goto retransmit;
/* /*
@ -1709,11 +1710,10 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
return; return;
} }
handshake_state_override_pairwise_cipher(sm->handshake, handshake_state_override_pairwise_cipher(hs, override);
override);
} }
if (!sm->handshake->wpa_ie && sm->handshake->group_cipher != if (!hs->wpa_ie && hs->group_cipher !=
IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC) { IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC) {
gtk = handshake_util_find_gtk_kde(decrypted_key_data, gtk = handshake_util_find_gtk_kde(decrypted_key_data,
decrypted_key_data_size, decrypted_key_data_size,
@ -1731,7 +1731,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
} else } else
gtk = NULL; gtk = NULL;
if (sm->handshake->mfp) { if (hs->mfp) {
igtk = handshake_util_find_igtk_kde(decrypted_key_data, igtk = handshake_util_find_igtk_kde(decrypted_key_data,
decrypted_key_data_size, decrypted_key_data_size,
&igtk_len); &igtk_len);
@ -1746,7 +1746,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
} else } else
igtk = NULL; igtk = NULL;
if (sm->handshake->support_ip_allocation) { if (hs->support_ip_allocation) {
const uint8_t *ip_alloc_kde = const uint8_t *ip_alloc_kde =
eapol_find_wfa_kde(decrypted_key_data, eapol_find_wfa_kde(decrypted_key_data,
decrypted_key_data_size, decrypted_key_data_size,
@ -1762,15 +1762,12 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
return; return;
} }
sm->handshake->support_ip_allocation = ip_alloc_kde != NULL; hs->support_ip_allocation = ip_alloc_kde != NULL;
if (ip_alloc_kde) { if (ip_alloc_kde) {
sm->handshake->client_ip_addr = hs->client_ip_addr = l_get_be32(ip_alloc_kde + 6);
l_get_be32(ip_alloc_kde + 6); hs->subnet_mask = l_get_be32(ip_alloc_kde + 10);
sm->handshake->subnet_mask = hs->go_ip_addr = l_get_be32(ip_alloc_kde + 14);
l_get_be32(ip_alloc_kde + 10);
sm->handshake->go_ip_addr =
l_get_be32(ip_alloc_kde + 14);
} else } else
l_debug("Authenticator ignored our IP Address Request"); l_debug("Authenticator ignored our IP Address Request");
} }
@ -1791,13 +1788,13 @@ retransmit:
step4 = eapol_create_ptk_4_of_4(sm->protocol_version, step4 = eapol_create_ptk_4_of_4(sm->protocol_version,
ek->key_descriptor_version, ek->key_descriptor_version,
sm->replay_counter, sm->replay_counter,
sm->handshake->wpa_ie, sm->mic_len); hs->wpa_ie, sm->mic_len);
kck = handshake_state_get_kck(sm->handshake); kck = handshake_state_get_kck(hs);
kek = handshake_state_get_kek(sm->handshake); kek = handshake_state_get_kek(hs);
if (sm->mic_len) { if (sm->mic_len) {
if (!eapol_calculate_mic(sm->handshake->akm_suite, kck, if (!eapol_calculate_mic(hs->akm_suite, kck,
step4, mic, sm->mic_len)) { step4, mic, sm->mic_len)) {
l_debug("MIC Calculation failed"); l_debug("MIC Calculation failed");
l_free(step4); l_free(step4);
@ -1807,9 +1804,8 @@ retransmit:
memcpy(EAPOL_KEY_MIC(step4), mic, sm->mic_len); memcpy(EAPOL_KEY_MIC(step4), mic, sm->mic_len);
} else { } else {
if (!eapol_aes_siv_encrypt( if (!eapol_aes_siv_encrypt(handshake_state_get_kek(hs),
handshake_state_get_kek(sm->handshake), handshake_state_get_kek_len(hs),
handshake_state_get_kek_len(sm->handshake),
step4, NULL, 0)) { step4, NULL, 0)) {
l_debug("AES-SIV encryption failed"); l_debug("AES-SIV encryption failed");
l_free(step4); l_free(step4);
@ -1821,7 +1817,7 @@ retransmit:
eapol_sm_write(sm, (struct eapol_frame *) step4, unencrypted); eapol_sm_write(sm, (struct eapol_frame *) step4, unencrypted);
l_free(step4); l_free(step4);
if (sm->handshake->ptk_complete) if (hs->ptk_complete)
return; return;
/* /*
@ -1829,9 +1825,8 @@ retransmit:
* ptk, this flag tells netdev to wait for the gtk/igtk before * ptk, this flag tells netdev to wait for the gtk/igtk before
* completing the connection. * completing the connection.
*/ */
if (!gtk && sm->handshake->group_cipher != if (!gtk && hs->group_cipher != IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC)
IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC) hs->wait_for_gtk = true;
sm->handshake->wait_for_gtk = true;
if (gtk) if (gtk)
eapol_install_gtk(sm, gtk_key_index, gtk, gtk_len, ek->key_rsc); eapol_install_gtk(sm, gtk_key_index, gtk, gtk_len, ek->key_rsc);
@ -1839,10 +1834,10 @@ retransmit:
if (igtk) if (igtk)
eapol_install_igtk(sm, igtk_key_index, igtk, igtk_len); eapol_install_igtk(sm, igtk_key_index, igtk, igtk_len);
handshake_state_install_ptk(sm->handshake); handshake_state_install_ptk(hs);
if (rekey_offload) if (rekey_offload)
rekey_offload(sm->handshake->ifindex, kek, kck, rekey_offload(hs->ifindex, kek, kck,
sm->replay_counter, sm->user_data); sm->replay_counter, sm->user_data);
l_timeout_remove(sm->timeout); l_timeout_remove(sm->timeout);