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eapol: Add checking that first RSNE is as expected

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This commit is contained in:
Denis Kenzior 2015-02-24 22:09:10 -06:00
parent 7f9b8117fd
commit 9760bcb5c3
1 changed files with 105 additions and 1 deletions
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106
src/eapol.c
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@ -564,6 +564,104 @@ static const uint8_t *eapol_find_gtk_kde(const uint8_t *data, size_t data_len,
return NULL;
}
static const uint8_t *eapol_find_rsne(const uint8_t *data, size_t data_len)
{
struct ie_tlv_iter iter;
ie_tlv_iter_init(&iter, data, data_len);
while (ie_tlv_iter_next(&iter)) {
if (ie_tlv_iter_get_tag(&iter) != IE_TYPE_RSN)
continue;
return ie_tlv_iter_get_data(&iter) - 2;
}
return NULL;
}
/*
* This function performs a match of the RSN IE obtained from the scan
* results vs the RSN IE obtained as part of the 4-way handshake. If they
* don't match, the EAPoL packet must be silently discarded.
*/
static bool eapol_ap_rsne_matches(const uint8_t *eapol_rsne,
const uint8_t *scan_rsne)
{
struct ie_rsn_info eapol_info;
struct ie_rsn_info scan_info;
/*
* First check that the sizes match, if they do, run a bitwise
* comparison.
*/
if (eapol_rsne[1] == scan_rsne[1] &&
!memcmp(eapol_rsne + 2, scan_rsne + 2, eapol_rsne[1]))
return true;
/*
* Otherwise we have to parse the RSN IEs and compare the individual
* fields
*/
if (ie_parse_rsne_from_data(eapol_rsne, eapol_rsne[1] + 2,
&eapol_info) < 0)
return false;
if (ie_parse_rsne_from_data(scan_rsne, scan_rsne[1] + 2,
&scan_info) < 0)
return false;
if (eapol_info.group_cipher != scan_info.group_cipher)
return false;
if (eapol_info.pairwise_ciphers != scan_info.pairwise_ciphers)
return false;
if (eapol_info.akm_suites != scan_info.akm_suites)
return false;
if (eapol_info.preauthentication != scan_info.preauthentication)
return false;
if (eapol_info.no_pairwise != scan_info.no_pairwise)
return false;
if (eapol_info.ptksa_replay_counter != scan_info.ptksa_replay_counter)
return false;
if (eapol_info.gtksa_replay_counter != scan_info.gtksa_replay_counter)
return false;
if (eapol_info.mfpr != scan_info.mfpr)
return false;
if (eapol_info.mfpc != scan_info.mfpc)
return false;
if (eapol_info.peerkey_enabled != scan_info.peerkey_enabled)
return false;
if (eapol_info.spp_a_msdu_capable != scan_info.spp_a_msdu_capable)
return false;
if (eapol_info.spp_a_msdu_required != scan_info.spp_a_msdu_required)
return false;
if (eapol_info.pbac != scan_info.pbac)
return false;
if (eapol_info.extended_key_id != scan_info.extended_key_id)
return false;
/* We don't check the PMKIDs since these might actually be different */
if (eapol_info.group_management_cipher !=
scan_info.group_management_cipher)
return false;
return true;
}
static void eapol_handle_ptk_3_of_4(int ifindex, struct eapol_sm *sm,
const struct eapol_key *ek,
const uint8_t *decrypted_key_data,
@ -574,6 +672,7 @@ static void eapol_handle_ptk_3_of_4(int ifindex, struct eapol_sm *sm,
uint8_t mic[16];
const uint8_t *gtk;
size_t gtk_len;
const uint8_t *rsne;
if (!eapol_verify_ptk_3_of_4(ek))
return;
@ -587,12 +686,17 @@ static void eapol_handle_ptk_3_of_4(int ifindex, struct eapol_sm *sm,
return;
/*
* TODO: Check that first RSNE matches ap_rsne
* 11.6.6.4: "Verifies the RSNE. If it is part of a Fast BSS Transition
* Initial Mobility Domain Association, see 12.4.2. Otherwise, if it is
* not identical to that the STA received in the Beacon or Probe
* Response frame, the STA shall disassociate.
*/
rsne = eapol_find_rsne(decrypted_key_data, decrypted_key_data_size);
if (!rsne)
return;
if (!eapol_ap_rsne_matches(rsne, sm->ap_rsn))
return;
/*
* TODO: Parse second RSNE