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eapol: Send / Validate RSNXE in STA mode

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This commit is contained in:
Denis Kenzior 2021-07-08 22:15:46 -05:00
parent 1a7c5786f6
commit 636c6eb645
1 changed files with 73 additions and 32 deletions
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105
src/eapol.c
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@ -1098,6 +1098,15 @@ static void eapol_ptk_1_of_4_retry(struct l_timeout *timeout, void *user_data)
eapol_set_key_timeout(sm, eapol_ptk_1_of_4_retry);
}
static inline size_t append_ie(uint8_t *ies, const uint8_t *ie)
{
if (!ie)
return 0;
memcpy(ies, ie, ie[1] + 2);
return ie[1] + 2;
}
static void eapol_handle_ptk_1_of_4(struct eapol_sm *sm,
const struct eapol_key *ek,
bool unencrypted)
@ -1105,7 +1114,7 @@ static void eapol_handle_ptk_1_of_4(struct eapol_sm *sm,
const uint8_t *kck;
struct eapol_key *step2;
uint8_t mic[MIC_MAXLEN];
uint8_t ies[512];
uint8_t ies[1024];
size_t ies_len;
const uint8_t *own_ie = sm->handshake->supplicant_ie;
const uint8_t *pmkid;
@ -1210,9 +1219,6 @@ static void eapol_handle_ptk_1_of_4(struct eapol_sm *sm,
(IE_RSN_AKM_SUITE_FT_OVER_8021X |
IE_RSN_AKM_SUITE_FT_USING_PSK |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)) {
const uint8_t *mde = sm->handshake->mde;
const uint8_t *fte = sm->handshake->fte;
/*
* Rebuild the RSNE to include the PMKR1Name and append
* MDE + FTE.
@ -1223,14 +1229,10 @@ static void eapol_handle_ptk_1_of_4(struct eapol_sm *sm,
ie_build_rsne(&rsn_info, ies);
ies_len = ies[1] + 2;
memcpy(ies + ies_len, mde, mde[1] + 2);
ies_len += mde[1] + 2;
memcpy(ies + ies_len, fte, fte[1] + 2);
ies_len += fte[1] + 2;
ies_len += append_ie(ies + ies_len, sm->handshake->mde);
ies_len += append_ie(ies + ies_len, sm->handshake->fte);
} else {
ies_len = own_ie[1] + 2;
memcpy(ies, own_ie, ies_len);
ies_len = append_ie(ies, own_ie);
}
if (sm->handshake->support_ip_allocation) {
@ -1242,6 +1244,14 @@ static void eapol_handle_ptk_1_of_4(struct eapol_sm *sm,
ies[ies_len++] = 0x01;
}
/*
* 802.11-2020, Section 12.7.6.3:
* "The RSNXE that the Supplicant sent in its (Re)Association Request
* frame, if this element is present in the (Re)Association Request
* frame that the Supplicant sent."
*/
ies_len += append_ie(ies + ies_len, sm->handshake->supplicant_rsnxe);
step2 = eapol_create_ptk_2_of_4(sm->protocol_version,
ek->key_descriptor_version,
L_BE64_TO_CPU(ek->key_replay_counter),
@ -1552,6 +1562,33 @@ static bool eapol_check_ip_mask(const uint8_t *mask,
(uint32_t) (mask_uint << __builtin_popcountl(mask_uint)) == 0;
}
static int eapol_ie_matches(const void *ies, size_t ies_len,
enum ie_type type, uint8_t *target_ie)
{
struct ie_tlv_iter iter;
ie_tlv_iter_init(&iter, ies, ies_len);
while (ie_tlv_iter_next(&iter)) {
if (ie_tlv_iter_get_tag(&iter) != type)
continue;
if (!target_ie)
return -EINVAL;
if (memcmp(ie_tlv_iter_get_data(&iter) - 2,
target_ie, target_ie[1] + 2))
return -EBADMSG;
return 0;
}
if (!target_ie)
return 0;
return -ENOENT;
}
static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
const struct eapol_key *ek,
const uint8_t *decrypted_key_data,
@ -1618,10 +1655,7 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
(IE_RSN_AKM_SUITE_FT_OVER_8021X |
IE_RSN_AKM_SUITE_FT_USING_PSK |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)) {
struct ie_tlv_iter iter;
struct ie_rsn_info ie_info;
const uint8_t *mde = hs->mde;
const uint8_t *fte = hs->fte;
if (ie_parse_rsne_from_data(rsne, rsne[1] + 2, &ie_info) < 0)
goto error_ie_different;
@ -1630,27 +1664,34 @@ static void eapol_handle_ptk_3_of_4(struct eapol_sm *sm,
hs->pmk_r1_name, 16))
goto error_ie_different;
ie_tlv_iter_init(&iter, decrypted_key_data,
decrypted_key_data_size);
if (eapol_ie_matches(decrypted_key_data,
decrypted_key_data_size,
IE_TYPE_MOBILITY_DOMAIN,
hs->mde) < 0)
goto error_ie_different;
while (ie_tlv_iter_next(&iter))
switch (ie_tlv_iter_get_tag(&iter)) {
case IE_TYPE_MOBILITY_DOMAIN:
if (memcmp(ie_tlv_iter_get_data(&iter) - 2,
mde, mde[1] + 2))
goto error_ie_different;
break;
case IE_TYPE_FAST_BSS_TRANSITION:
if (memcmp(ie_tlv_iter_get_data(&iter) - 2,
fte, fte[1] + 2))
goto error_ie_different;
break;
}
if (eapol_ie_matches(decrypted_key_data,
decrypted_key_data_size,
IE_TYPE_FAST_BSS_TRANSITION,
hs->fte) < 0)
goto error_ie_different;
}
/*
* 802.11-2020, Section 12.7.6.4:
* "If the RSNXE is present, the Supplicant verifies that the RSNXE is
* identical to that the STA received in the Beacon or Probe Response
* frame."
*
* Verify only if RSN is used
*/
if (!hs->osen_ie && !hs->wpa_ie &&
eapol_ie_matches(decrypted_key_data,
decrypted_key_data_size,
IE_TYPE_RSNX,
hs->authenticator_rsnxe) < 0)
goto error_ie_different;
/*
* If ptk_complete is set, then we are receiving Message 3 again.
* It must be a retransmission, otherwise the anonce wouldn't match