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FT: Check key derivation results explicitly in AP operations

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Previously, any potential (even if very unlikely) local operation error
was ignored. Now these will result in aborting the negotiation.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2017-02-14 11:09:30 +02:00 committed by Jouni Malinen
parent f229f2c67d
commit 364c064a41
4 changed files with 73 additions and 51 deletions
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6
src/ap/wpa_auth.c
View File

@ -857,7 +857,8 @@ static int wpa_try_alt_snonce(struct wpa_state_machine *sm, u8 *data,
pmk_len = sm->pmk_len;
}
wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK);
if (wpa_derive_ptk(sm, sm->alt_SNonce, pmk, pmk_len, &PTK) < 0)
break;
if (wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK, data, data_len)
== 0) {
@ -2464,7 +2465,8 @@ SM_STATE(WPA_PTK, PTKCALCNEGOTIATING)
pmk_len = sm->pmk_len;
}
wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK);
if (wpa_derive_ptk(sm, sm->SNonce, pmk, pmk_len, &PTK) < 0)
break;
if (mic_len &&
wpa_verify_key_mic(sm->wpa_key_mgmt, &PTK,

43
src/ap/wpa_auth_ft.c
View File

@ -392,16 +392,19 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
return -1;
}
wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, ssid, ssid_len, mdid,
r0kh, r0kh_len, sm->addr,
pmk_r0, pmk_r0_name) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
if (!psk_local || !wpa_key_mgmt_ft_psk(sm->wpa_key_mgmt))
wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name,
sm->pairwise);
wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
pmk_r1, sm->pmk_r1_name);
if (wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
pmk_r1, sm->pmk_r1_name) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", sm->pmk_r1_name,
WPA_PMK_NAME_LEN);
@ -834,12 +837,12 @@ static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
if (pmk == NULL)
break;
wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
r0kh_len, sm->addr,
pmk_r0, pmk_r0_name) < 0 ||
wpa_derive_pmk_r1(pmk_r0, pmk_r0_name, r1kh, sm->addr,
pmk_r1, pmk_r1_name);
if (os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
pmk_r1, pmk_r1_name) < 0 ||
os_memcmp_const(pmk_r1_name, req_pmk_r1_name,
WPA_PMK_NAME_LEN) != 0)
continue;
@ -958,9 +961,10 @@ static int wpa_ft_process_auth_req(struct wpa_state_machine *sm,
wpa_hexdump(MSG_DEBUG, "FT: Requested PMKR0Name",
parse.rsn_pmkid, WPA_PMK_NAME_LEN);
wpa_derive_pmk_r1_name(parse.rsn_pmkid,
if (wpa_derive_pmk_r1_name(parse.rsn_pmkid,
sm->wpa_auth->conf.r1_key_holder, sm->addr,
pmk_r1_name);
pmk_r1_name) < 0)
return WLAN_STATUS_UNSPECIFIED_FAILURE;
wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
pmk_r1_name, WPA_PMK_NAME_LEN);
@ -1483,8 +1487,11 @@ static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
return -1;
}
wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
r.pmk_r1, r.pmk_r1_name);
if (wpa_derive_pmk_r1(pmk_r0, f.pmk_r0_name, f.r1kh_id, f.s1kh_id,
r.pmk_r1, r.pmk_r1_name) < 0) {
os_memset(pmk_r0, 0, PMK_LEN);
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", r.pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", r.pmk_r1_name,
WPA_PMK_NAME_LEN);
@ -1825,7 +1832,7 @@ int wpa_ft_rrb_rx(struct wpa_authenticator *wpa_auth, const u8 *src_addr,
}
static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
static int wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
struct wpa_ft_pmk_r0_sa *pmk_r0,
struct ft_remote_r1kh *r1kh,
const u8 *s1kh_id, int pairwise)
@ -1846,8 +1853,9 @@ static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
os_memcpy(f.r1kh_id, r1kh->id, FT_R1KH_ID_LEN);
os_memcpy(f.s1kh_id, s1kh_id, ETH_ALEN);
os_memcpy(f.pmk_r0_name, pmk_r0->pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
s1kh_id, f.pmk_r1, f.pmk_r1_name);
if (wpa_derive_pmk_r1(pmk_r0->pmk_r0, pmk_r0->pmk_r0_name, r1kh->id,
s1kh_id, f.pmk_r1, f.pmk_r1_name) < 0)
return -1;
wpa_printf(MSG_DEBUG, "FT: R1KH-ID " MACSTR, MAC2STR(r1kh->id));
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", f.pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", f.pmk_r1_name,
@ -1863,9 +1871,10 @@ static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
if (aes_wrap(r1kh->key, sizeof(r1kh->key),
(FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
plain, crypt) < 0)
return;
return -1;
wpa_ft_rrb_send(wpa_auth, r1kh->addr, (u8 *) &frame, sizeof(frame));
return 0;
}

35
src/common/wpa_common.c
View File

@ -1104,7 +1104,7 @@ int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_len,
*
* IEEE Std 802.11r-2008 - 8.5.1.5.3
*/
void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
const u8 *ssid, size_t ssid_len,
const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len,
const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name)
@ -1124,7 +1124,7 @@ void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
* PMK-R0Name-Salt = L(R0-Key-Data, 256, 128)
*/
if (ssid_len > SSID_MAX_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN)
return;
return -1;
pos = buf;
*pos++ = ssid_len;
os_memcpy(pos, ssid, ssid_len);
@ -1137,8 +1137,9 @@ void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
os_memcpy(pos, s0kh_id, ETH_ALEN);
pos += ETH_ALEN;
sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
r0_key_data, sizeof(r0_key_data));
if (sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
r0_key_data, sizeof(r0_key_data)) < 0)
return -1;
os_memcpy(pmk_r0, r0_key_data, PMK_LEN);
/*
@ -1149,8 +1150,10 @@ void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
addr[1] = r0_key_data + PMK_LEN;
len[1] = 16;
sha256_vector(2, addr, len, hash);
if (sha256_vector(2, addr, len, hash) < 0)
return -1;
os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN);
return 0;
}
@ -1159,7 +1162,7 @@ void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
*
* IEEE Std 802.11r-2008 - 8.5.1.5.4
*/
void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
int wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
const u8 *s1kh_id, u8 *pmk_r1_name)
{
u8 hash[32];
@ -1179,8 +1182,10 @@ void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
addr[3] = s1kh_id;
len[3] = ETH_ALEN;
sha256_vector(4, addr, len, hash);
if (sha256_vector(4, addr, len, hash) < 0)
return -1;
os_memcpy(pmk_r1_name, hash, WPA_PMK_NAME_LEN);
return 0;
}
@ -1189,7 +1194,7 @@ void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
*
* IEEE Std 802.11r-2008 - 8.5.1.5.4
*/
void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
int wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
const u8 *r1kh_id, const u8 *s1kh_id,
u8 *pmk_r1, u8 *pmk_r1_name)
{
@ -1203,9 +1208,12 @@ void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
os_memcpy(pos, s1kh_id, ETH_ALEN);
pos += ETH_ALEN;
sha256_prf(pmk_r0, PMK_LEN, "FT-R1", buf, pos - buf, pmk_r1, PMK_LEN);
if (sha256_prf(pmk_r0, PMK_LEN, "FT-R1", buf, pos - buf,
pmk_r1, PMK_LEN) < 0)
return -1;
wpa_derive_pmk_r1_name(pmk_r0_name, r1kh_id, s1kh_id, pmk_r1_name);
return wpa_derive_pmk_r1_name(pmk_r0_name, r1kh_id, s1kh_id,
pmk_r1_name);
}
@ -1245,7 +1253,9 @@ int wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce,
ptk->tk_len = wpa_cipher_key_len(cipher);
ptk_len = ptk->kck_len + ptk->kek_len + ptk->tk_len;
sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf, tmp, ptk_len);
if (sha256_prf(pmk_r1, PMK_LEN, "FT-PTK", buf, pos - buf,
tmp, ptk_len) < 0)
return -1;
/*
* PTKName = Truncate-128(SHA-256(PMKR1Name || "FT-PTKN" || SNonce ||
@ -1264,7 +1274,8 @@ int wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce,
addr[5] = sta_addr;
len[5] = ETH_ALEN;
sha256_vector(6, addr, len, hash);
if (sha256_vector(6, addr, len, hash) < 0)
return -1;
os_memcpy(ptk_name, hash, WPA_PMK_NAME_LEN);
os_memcpy(ptk->kck, tmp, ptk->kck_len);

6
src/common/wpa_common.h
View File

@ -358,13 +358,13 @@ int wpa_ft_mic(const u8 *kck, size_t kck_len, const u8 *sta_addr,
const u8 *ftie, size_t ftie_len,
const u8 *rsnie, size_t rsnie_len,
const u8 *ric, size_t ric_len, u8 *mic);
void wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
const u8 *ssid, size_t ssid_len,
const u8 *mdid, const u8 *r0kh_id, size_t r0kh_id_len,
const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name);
void wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
int wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
const u8 *s1kh_id, u8 *pmk_r1_name);
void wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
int wpa_derive_pmk_r1(const u8 *pmk_r0, const u8 *pmk_r0_name,
const u8 *r1kh_id, const u8 *s1kh_id,
u8 *pmk_r1, u8 *pmk_r1_name);
int wpa_pmk_r1_to_ptk(const u8 *pmk_r1, const u8 *snonce, const u8 *anonce,