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eapol: Build FT-version step 2 of 4-way handshake

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If an FT AKM suite is selected, build the FT version of the step 2
of the 4-way handshake frame.  Step 1 is same as non-FT version.
This commit is contained in:
Andrew Zaborowski 2016-11-02 23:46:13 +01:00 committed by Denis Kenzior
parent 0d2e5b9849
commit 9d54a3082e
1 changed files with 78 additions and 15 deletions
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87
src/eapol.c
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@ -732,6 +732,10 @@ struct eapol_sm {
uint8_t snonce[32];
uint8_t anonce[32];
uint8_t ptk[64];
uint8_t pmk_r0[32];
uint8_t pmk_r0_name[16];
uint8_t pmk_r1[32];
uint8_t pmk_r1_name[16];
eapol_sm_event_func_t event_func;
void *user_data;
struct l_timeout *timeout;
@ -997,26 +1001,26 @@ static void eapol_handle_ptk_1_of_4(uint32_t ifindex, struct eapol_sm *sm,
struct eapol_key *step2;
uint8_t mic[16];
bool use_sha256;
uint8_t *ies;
size_t ies_len;
enum crypto_cipher cipher;
size_t ptk_size;
if (!eapol_verify_ptk_1_of_4(ek)) {
handshake_failed(ifindex, sm, MPDU_REASON_CODE_UNSPECIFIED);
return;
}
if (!eapol_verify_ptk_1_of_4(ek))
goto error_unspecified;
if (!get_nonce(sm->snonce)) {
handshake_failed(ifindex, sm, MPDU_REASON_CODE_UNSPECIFIED);
return;
}
if (!get_nonce(sm->snonce))
goto error_unspecified;
sm->have_snonce = true;
sm->ptk_complete = false;
memcpy(sm->anonce, ek->key_nonce, sizeof(ek->key_nonce));
if (sm->akm_suite == IE_RSN_AKM_SUITE_8021X_SHA256 ||
sm->akm_suite == IE_RSN_AKM_SUITE_PSK_SHA256)
if (sm->akm_suite & (IE_RSN_AKM_SUITE_8021X_SHA256 |
IE_RSN_AKM_SUITE_PSK_SHA256 |
IE_RSN_AKM_SUITE_SAE_SHA256 |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256))
use_sha256 = true;
else
use_sha256 = false;
@ -1025,16 +1029,70 @@ static void eapol_handle_ptk_1_of_4(uint32_t ifindex, struct eapol_sm *sm,
ptk_size = sizeof(struct crypto_ptk) + crypto_cipher_key_len(cipher);
if (sm->akm_suite & (IE_RSN_AKM_SUITE_FT_OVER_8021X |
IE_RSN_AKM_SUITE_FT_USING_PSK |
IE_RSN_AKM_SUITE_FT_OVER_SAE_SHA256)) {
uint16_t mdid;
uint8_t ptk_name[16];
struct ie_rsn_info rsn_info;
if (!sm->mde || !sm->fte)
goto error_unspecified;
ie_parse_mobility_domain_from_data(sm->mde, sm->mde[1] + 2,
&mdid, NULL, NULL);
if (!crypto_derive_pmk_r0(sm->pmk, sm->ssid, sm->ssid_len, mdid,
sm->r0khid, sm->r0khid_len,
sm->spa,
sm->pmk_r0, sm->pmk_r0_name))
goto error_unspecified;
if (!crypto_derive_pmk_r1(sm->pmk_r0, sm->r1khid, sm->spa,
sm->pmk_r0_name,
sm->pmk_r1, sm->pmk_r1_name))
goto error_unspecified;
if (!crypto_derive_ft_ptk(sm->pmk_r1, sm->pmk_r1_name, sm->aa,
sm->spa, sm->snonce, sm->anonce,
ptk, ptk_size, ptk_name))
goto error_unspecified;
/*
* Rebuild the RSNE to include the PMKR1Name and append
* MDE + FTE.
*/
ies = alloca(512);
if (ie_parse_rsne_from_data(sm->own_ie, sm->own_ie[1] + 2,
&rsn_info) < 0)
goto error_unspecified;
rsn_info.num_pmkids = 1;
rsn_info.pmkids = sm->pmk_r1_name;
ie_build_rsne(&rsn_info, ies);
ies_len = ies[1] + 2;
memcpy(ies + ies_len, sm->mde, sm->mde[1] + 2);
ies_len += sm->mde[1] + 2;
memcpy(ies + ies_len, sm->fte, sm->fte[1] + 2);
ies_len += sm->fte[1] + 2;
} else {
crypto_derive_pairwise_ptk(sm->pmk, sm->spa, sm->aa,
sm->anonce, sm->snonce,
ptk, ptk_size, use_sha256);
ies_len = sm->own_ie[1] + 2;
ies = sm->own_ie;
}
step2 = eapol_create_ptk_2_of_4(sm->protocol_version,
ek->key_descriptor_version,
sm->replay_counter,
sm->snonce,
sm->own_ie[1] + 2, sm->own_ie,
sm->wpa_ie);
ies_len, ies, sm->wpa_ie);
if (!eapol_calculate_mic(ptk->kck, step2, mic)) {
l_info("MIC calculation failed. "
@ -1051,6 +1109,11 @@ static void eapol_handle_ptk_1_of_4(uint32_t ifindex, struct eapol_sm *sm,
l_timeout_remove(sm->timeout);
sm->timeout = NULL;
return;
error_unspecified:
handshake_failed(ifindex, sm, MPDU_REASON_CODE_UNSPECIFIED);
}
static const uint8_t *eapol_find_kde(const uint8_t *data, size_t data_len,