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FT: Reassociation Request frame parsing for FT-SAE-EXT-KEY

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Handle the new MIC field length option for the SHA512-based variant.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
This commit is contained in:
Jouni Malinen 2022-10-16 16:38:27 +03:00 committed by Jouni Malinen
parent e8f23c9480
commit 879363bbc1
1 changed files with 26 additions and 43 deletions
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67
src/ap/wpa_auth_ft.c
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@ -3409,21 +3409,16 @@ int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
struct wpa_ft_ies parse; struct wpa_ft_ies parse;
struct rsn_mdie *mdie; struct rsn_mdie *mdie;
u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN]; u8 mic[WPA_EAPOL_KEY_MIC_MAX_LEN];
size_t mic_len = 16; size_t mic_len;
unsigned int count; unsigned int count;
const u8 *kck; const u8 *kck;
size_t kck_len; size_t kck_len;
int use_sha384;
const u8 *anonce, *snonce, *fte_mic;
u8 fte_elem_count;
int rsnxe_used;
struct wpa_auth_config *conf; struct wpa_auth_config *conf;
if (sm == NULL) if (sm == NULL)
return WLAN_STATUS_UNSPECIFIED_FAILURE; return WLAN_STATUS_UNSPECIFIED_FAILURE;
conf = &sm->wpa_auth->conf; conf = &sm->wpa_auth->conf;
use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len); wpa_hexdump(MSG_DEBUG, "FT: Reassoc Req IEs", ies, ies_len);
@ -3458,55 +3453,42 @@ int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
return WLAN_STATUS_INVALID_MDIE; return WLAN_STATUS_INVALID_MDIE;
} }
if (use_sha384) { if (sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
struct rsn_ftie_sha384 *ftie; sm->pmk_r1_len == SHA512_MAC_LEN)
mic_len = 32;
else if ((sm->wpa_key_mgmt == WPA_KEY_MGMT_FT_SAE_EXT_KEY &&
sm->pmk_r1_len == SHA384_MAC_LEN) ||
wpa_key_mgmt_sha384(sm->wpa_key_mgmt))
mic_len = 24;
else
mic_len = 16;
ftie = (struct rsn_ftie_sha384 *) parse.ftie; if (!parse.ftie || !parse.fte_anonce || !parse.fte_snonce ||
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) { parse.fte_mic_len != mic_len) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE"); wpa_printf(MSG_DEBUG,
"FT: Invalid FTE (fte_mic_len=%zu mic_len=%zu)",
parse.fte_mic_len, mic_len);
return WLAN_STATUS_INVALID_FTIE; return WLAN_STATUS_INVALID_FTIE;
} }
anonce = ftie->anonce; if (os_memcmp(parse.fte_snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
snonce = ftie->snonce;
rsnxe_used = ftie->mic_control[0] & 0x01;
fte_elem_count = ftie->mic_control[1];
fte_mic = ftie->mic;
} else {
struct rsn_ftie *ftie;
ftie = (struct rsn_ftie *) parse.ftie;
if (ftie == NULL || parse.ftie_len < sizeof(*ftie)) {
wpa_printf(MSG_DEBUG, "FT: Invalid FTIE");
return WLAN_STATUS_INVALID_FTIE;
}
anonce = ftie->anonce;
snonce = ftie->snonce;
rsnxe_used = ftie->mic_control[0] & 0x01;
fte_elem_count = ftie->mic_control[1];
fte_mic = ftie->mic;
}
if (os_memcmp(snonce, sm->SNonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE"); wpa_printf(MSG_DEBUG, "FT: SNonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received SNonce", wpa_hexdump(MSG_DEBUG, "FT: Received SNonce",
snonce, WPA_NONCE_LEN); parse.fte_snonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce", wpa_hexdump(MSG_DEBUG, "FT: Expected SNonce",
sm->SNonce, WPA_NONCE_LEN); sm->SNonce, WPA_NONCE_LEN);
return WLAN_STATUS_INVALID_FTIE; return WLAN_STATUS_INVALID_FTIE;
} }
if (os_memcmp(anonce, sm->ANonce, WPA_NONCE_LEN) != 0) { if (os_memcmp(parse.fte_anonce, sm->ANonce, WPA_NONCE_LEN) != 0) {
wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE"); wpa_printf(MSG_DEBUG, "FT: ANonce mismatch in FTIE");
wpa_hexdump(MSG_DEBUG, "FT: Received ANonce", wpa_hexdump(MSG_DEBUG, "FT: Received ANonce",
anonce, WPA_NONCE_LEN); parse.fte_anonce, WPA_NONCE_LEN);
wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce", wpa_hexdump(MSG_DEBUG, "FT: Expected ANonce",
sm->ANonce, WPA_NONCE_LEN); sm->ANonce, WPA_NONCE_LEN);
return WLAN_STATUS_INVALID_FTIE; return WLAN_STATUS_INVALID_FTIE;
} }
if (parse.r0kh_id == NULL) { if (parse.r0kh_id == NULL) {
wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE"); wpa_printf(MSG_DEBUG, "FT: No R0KH-ID subelem in FTIE");
return WLAN_STATUS_INVALID_FTIE; return WLAN_STATUS_INVALID_FTIE;
@ -3553,10 +3535,10 @@ int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
count += ieee802_11_ie_count(parse.ric, parse.ric_len); count += ieee802_11_ie_count(parse.ric, parse.ric_len);
if (parse.rsnxe) if (parse.rsnxe)
count++; count++;
if (fte_elem_count != count) { if (parse.fte_elem_count != count) {
wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC " wpa_printf(MSG_DEBUG, "FT: Unexpected IE count in MIC "
"Control: received %u expected %u", "Control: received %u expected %u",
fte_elem_count, count); parse.fte_elem_count, count);
return WLAN_STATUS_UNSPECIFIED_FAILURE; return WLAN_STATUS_UNSPECIFIED_FAILURE;
} }
@ -3580,12 +3562,12 @@ int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
return WLAN_STATUS_UNSPECIFIED_FAILURE; return WLAN_STATUS_UNSPECIFIED_FAILURE;
} }
if (os_memcmp_const(mic, fte_mic, mic_len) != 0) { if (os_memcmp_const(mic, parse.fte_mic, mic_len) != 0) {
wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE"); wpa_printf(MSG_DEBUG, "FT: Invalid MIC in FTIE");
wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR, wpa_printf(MSG_DEBUG, "FT: addr=" MACSTR " auth_addr=" MACSTR,
MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr)); MAC2STR(sm->addr), MAC2STR(sm->wpa_auth->addr));
wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC", wpa_hexdump(MSG_MSGDUMP, "FT: Received MIC",
fte_mic, mic_len); parse.fte_mic, mic_len);
wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len); wpa_hexdump(MSG_MSGDUMP, "FT: Calculated MIC", mic, mic_len);
wpa_hexdump(MSG_MSGDUMP, "FT: MDIE", wpa_hexdump(MSG_MSGDUMP, "FT: MDIE",
parse.mdie - 2, parse.mdie_len + 2); parse.mdie - 2, parse.mdie_len + 2);
@ -3599,7 +3581,8 @@ int wpa_ft_validate_reassoc(struct wpa_state_machine *sm, const u8 *ies,
return WLAN_STATUS_INVALID_FTIE; return WLAN_STATUS_INVALID_FTIE;
} }
if (rsnxe_used && (conf->sae_pwe == 1 || conf->sae_pwe == 2) && if (parse.fte_rsnxe_used &&
(conf->sae_pwe == 1 || conf->sae_pwe == 2) &&
!parse.rsnxe) { !parse.rsnxe) {
wpa_printf(MSG_INFO, wpa_printf(MSG_INFO,
"FT: FTE indicated that STA uses RSNXE, but RSNXE was not included"); "FT: FTE indicated that STA uses RSNXE, but RSNXE was not included");