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ft: update for larger MIC/FILS-FT

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James Prestwood 2019-05-22 15:24:01 -07:00 committed by Denis Kenzior
parent 1accf534dc
commit 7f7a5c861d
1 changed files with 15 additions and 10 deletions
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25
src/ft.c
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@ -55,7 +55,8 @@ static bool ft_calculate_fte_mic(struct handshake_state *hs, uint8_t seq_num,
int iov_elems = 0; int iov_elems = 0;
struct l_checksum *checksum; struct l_checksum *checksum;
const uint8_t *kck = handshake_state_get_kck(hs); const uint8_t *kck = handshake_state_get_kck(hs);
uint8_t zero_mic[16] = {}; size_t kck_len = handshake_state_get_kck_len(hs);
uint8_t zero_mic[24] = {};
iov[iov_elems].iov_base = hs->spa; iov[iov_elems].iov_base = hs->spa;
iov[iov_elems++].iov_len = 6; iov[iov_elems++].iov_len = 6;
@ -79,10 +80,10 @@ static bool ft_calculate_fte_mic(struct handshake_state *hs, uint8_t seq_num,
iov[iov_elems++].iov_len = 4; iov[iov_elems++].iov_len = 4;
iov[iov_elems].iov_base = zero_mic; iov[iov_elems].iov_base = zero_mic;
iov[iov_elems++].iov_len = 16; iov[iov_elems++].iov_len = kck_len;
iov[iov_elems].iov_base = (void *) (fte + 20); iov[iov_elems].iov_base = (void *) (fte + 4 + kck_len);
iov[iov_elems++].iov_len = fte[1] + 2 - 20; iov[iov_elems++].iov_len = fte[1] + 2 - 4 - kck_len;
} }
if (ric) { if (ric) {
@ -90,12 +91,16 @@ static bool ft_calculate_fte_mic(struct handshake_state *hs, uint8_t seq_num,
iov[iov_elems++].iov_len = ric[1] + 2; iov[iov_elems++].iov_len = ric[1] + 2;
} }
checksum = l_checksum_new_cmac_aes(kck, 16); if (kck_len == 16)
checksum = l_checksum_new_cmac_aes(kck, kck_len);
else
checksum = l_checksum_new_hmac(L_CHECKSUM_SHA384, kck, kck_len);
if (!checksum) if (!checksum)
return false; return false;
l_checksum_updatev(checksum, iov, iov_elems); l_checksum_updatev(checksum, iov, iov_elems);
l_checksum_get_digest(checksum, out_mic, 16); l_checksum_get_digest(checksum, out_mic, kck_len);
l_checksum_free(checksum); l_checksum_free(checksum);
return true; return true;
@ -430,7 +435,7 @@ static int ft_process_ies(struct ft_sm *ft, const uint8_t *ies, size_t ies_len)
*/ */
if (is_rsn) { if (is_rsn) {
struct ie_ft_info ft_info; struct ie_ft_info ft_info;
uint8_t zeros[16] = {}; uint8_t zeros[24] = {};
if (!fte) if (!fte)
goto ft_error; goto ft_error;
@ -440,7 +445,7 @@ static int ft_process_ies(struct ft_sm *ft, const uint8_t *ies, size_t ies_len)
goto ft_error; goto ft_error;
if (ft_info.mic_element_count != 0 || if (ft_info.mic_element_count != 0 ||
memcmp(ft_info.mic, zeros, 16)) memcmp(ft_info.mic, zeros, kck_len))
goto ft_error; goto ft_error;
if (hs->r0khid_len != ft_info.r0khid_len || if (hs->r0khid_len != ft_info.r0khid_len ||
@ -589,7 +594,7 @@ static int ft_rx_associate(struct auth_proto *ap, const uint8_t *frame,
if (fte) { if (fte) {
struct ie_ft_info ft_info; struct ie_ft_info ft_info;
uint8_t mic[16]; uint8_t mic[24];
if (ie_parse_fast_bss_transition_from_data(fte, fte[1] + 2, if (ie_parse_fast_bss_transition_from_data(fte, fte[1] + 2,
kck_len, &ft_info) < 0) kck_len, &ft_info) < 0)
@ -606,7 +611,7 @@ static int ft_rx_associate(struct auth_proto *ap, const uint8_t *frame,
return -EBADMSG; return -EBADMSG;
if (ft_info.mic_element_count != 3 || if (ft_info.mic_element_count != 3 ||
memcmp(ft_info.mic, mic, 16)) memcmp(ft_info.mic, mic, kck_len))
return -EBADMSG; return -EBADMSG;
if (hs->r0khid_len != ft_info.r0khid_len || if (hs->r0khid_len != ft_info.r0khid_len ||