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FT: PMK-R0 derivation using SHA384-based AKM

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Signed-off-by: Jouni Malinen <j@w1.fi>
master
Jouni Malinen 6 years ago
parent 1655e81c97
commit 994eac7e61
7 changed files with 72 additions and 23 deletions
Show Stats Download Patch File Download Diff File

10
src/ap/wpa_auth.c
Unescape Escape View File

@ -2126,17 +2126,21 @@ int fils_auth_pmk_to_ptk(struct wpa_state_machine *sm, const u8 *pmk,
if (fils_ft_len) {
struct wpa_authenticator *wpa_auth = sm->wpa_auth;
struct wpa_auth_config *conf = &wpa_auth->conf;
u8 pmk_r0[PMK_LEN], pmk_r0_name[WPA_PMK_NAME_LEN];
u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
int use_sha384 = wpa_key_mgmt_sha384(sm->wpa_key_mgmt);
size_t pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
if (wpa_derive_pmk_r0(fils_ft, fils_ft_len,
conf->ssid, conf->ssid_len,
conf->mobility_domain,
conf->r0_key_holder,
conf->r0_key_holder_len,
sm->addr, pmk_r0, pmk_r0_name) < 0)
sm->addr, pmk_r0, pmk_r0_name,
use_sha384) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0", pmk_r0, PMK_LEN);
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0",
pmk_r0, pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name",
pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_fils(sm, pmk_r0, pmk_r0_name);

11
src/ap/wpa_auth_ft.c
Unescape Escape View File

@ -1980,7 +1980,8 @@ int wpa_ft_store_pmk_fils(struct wpa_state_machine *sm,
const u8 *identity, *radius_cui;
size_t identity_len, radius_cui_len;
int session_timeout;
size_t pmk_r0_len = PMK_LEN;
size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
SHA384_MAC_LEN : PMK_LEN;
if (wpa_ft_get_vlan(sm->wpa_auth, sm->addr, &vlan) < 0) {
wpa_printf(MSG_DEBUG, "FT: vlan not available for STA " MACSTR,
@ -2004,7 +2005,8 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
struct wpa_ptk *ptk)
{
u8 pmk_r0[PMK_LEN_MAX], pmk_r0_name[WPA_PMK_NAME_LEN];
size_t pmk_r0_len = PMK_LEN;
size_t pmk_r0_len = wpa_key_mgmt_sha384(sm->wpa_key_mgmt) ?
SHA384_MAC_LEN : PMK_LEN;
size_t pmk_r1_len = pmk_r0_len;
u8 pmk_r1[PMK_LEN_MAX];
u8 ptk_name[WPA_PMK_NAME_LEN];
@ -2040,7 +2042,8 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
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)
pmk_r0, pmk_r0_name,
wpa_key_mgmt_sha384(sm->wpa_key_mgmt)) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name, WPA_PMK_NAME_LEN);
@ -2512,7 +2515,7 @@ static int wpa_ft_psk_pmk_r1(struct wpa_state_machine *sm,
if (wpa_derive_pmk_r0(pmk, PMK_LEN, ssid, ssid_len, mdid, r0kh,
r0kh_len, sm->addr,
pmk_r0, pmk_r0_name) < 0 ||
pmk_r0, pmk_r0_name, 0) < 0 ||
wpa_derive_pmk_r1(pmk_r0, PMK_LEN, pmk_r0_name, r1kh,
sm->addr, pmk_r1, pmk_r1_name) < 0 ||
os_memcmp_const(pmk_r1_name, req_pmk_r1_name,

56
src/common/wpa_common.c
Unescape Escape View File

@ -1420,24 +1420,36 @@ int wpa_parse_wpa_ie_wpa(const u8 *wpa_ie, size_t wpa_ie_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)
const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name,
int use_sha384)
{
u8 buf[1 + SSID_MAX_LEN + MOBILITY_DOMAIN_ID_LEN + 1 +
FT_R0KH_ID_MAX_LEN + ETH_ALEN];
u8 *pos, r0_key_data[48], hash[32];
u8 *pos, r0_key_data[64], hash[32];
const u8 *addr[2];
size_t len[2];
size_t q = use_sha384 ? 48 : 32;
size_t r0_key_data_len = q + 16;
/*
* R0-Key-Data = KDF-384(XXKey, "FT-R0",
* SSIDlength || SSID || MDID || R0KHlength ||
* R0KH-ID || S0KH-ID)
* XXKey is either the second 256 bits of MSK or PSK.
* PMK-R0 = L(R0-Key-Data, 0, 256)
* PMK-R0Name-Salt = L(R0-Key-Data, 256, 128)
* XXKey is either the second 256 bits of MSK or PSK; or the first
* 384 bits of MSK for FT-EAP-SHA384.
* PMK-R0 = L(R0-Key-Data, 0, Q)
* PMK-R0Name-Salt = L(R0-Key-Data, Q, 128)
* Q = 384 for FT-EAP-SHA384; otherwise, 256
*/
if (ssid_len > SSID_MAX_LEN || r0kh_id_len > FT_R0KH_ID_MAX_LEN)
return -1;
wpa_printf(MSG_DEBUG, "FT: Derive PMK-R0 using KDF-%s",
use_sha384 ? "SHA384" : "SHA256");
wpa_hexdump_key(MSG_DEBUG, "FT: XXKey", xxkey, xxkey_len);
wpa_hexdump_ascii(MSG_DEBUG, "FT: SSID", ssid, ssid_len);
wpa_hexdump(MSG_DEBUG, "FT: MDID", mdid, MOBILITY_DOMAIN_ID_LEN);
wpa_hexdump_ascii(MSG_DEBUG, "FT: R0KH-ID", r0kh_id, r0kh_id_len);
wpa_printf(MSG_DEBUG, "FT: S0KH-ID: " MACSTR, MAC2STR(s0kh_id));
pos = buf;
*pos++ = ssid_len;
os_memcpy(pos, ssid, ssid_len);
@ -1450,22 +1462,46 @@ int wpa_derive_pmk_r0(const u8 *xxkey, size_t xxkey_len,
os_memcpy(pos, s0kh_id, ETH_ALEN);
pos += ETH_ALEN;
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);
#ifdef CONFIG_SHA384
if (use_sha384) {
if (xxkey_len != SHA384_MAC_LEN) {
wpa_printf(MSG_ERROR,
"FT: Unexpected XXKey length %d (expected %d)",
(int) xxkey_len, SHA384_MAC_LEN);
return -1;
}
if (sha384_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
r0_key_data, r0_key_data_len) < 0)
return -1;
}
#endif /* CONFIG_SHA384 */
if (!use_sha384) {
if (xxkey_len != PMK_LEN) {
wpa_printf(MSG_ERROR,
"FT: Unexpected XXKey length %d (expected %d)",
(int) xxkey_len, PMK_LEN);
return -1;
}
if (sha256_prf(xxkey, xxkey_len, "FT-R0", buf, pos - buf,
r0_key_data, r0_key_data_len) < 0)
return -1;
}
os_memcpy(pmk_r0, r0_key_data, q);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", pmk_r0, q);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0Name-Salt", &r0_key_data[q], 16);
/*
* PMKR0Name = Truncate-128(SHA-256("FT-R0N" || PMK-R0Name-Salt)
*/
addr[0] = (const u8 *) "FT-R0N";
len[0] = 6;
addr[1] = r0_key_data + PMK_LEN;
addr[1] = &r0_key_data[q];
len[1] = 16;
if (sha256_vector(2, addr, len, hash) < 0)
return -1;
os_memcpy(pmk_r0_name, hash, WPA_PMK_NAME_LEN);
os_memset(r0_key_data, 0, sizeof(r0_key_data));
return 0;
}

3
src/common/wpa_common.h
Unescape Escape View File

@ -364,7 +364,8 @@ int wpa_ft_mic(const u8 *kck, size_t kck_len, const u8 *sta_addr,
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);
const u8 *s0kh_id, u8 *pmk_r0, u8 *pmk_r0_name,
int use_sha384);
int wpa_derive_pmk_r1_name(const u8 *pmk_r0_name, const u8 *r1kh_id,
const u8 *s1kh_id, u8 *pmk_r1_name);
int wpa_derive_pmk_r1(const u8 *pmk_r0, size_t pmk_r0_len,

7
src/rsn_supp/wpa.c
Unescape Escape View File

@ -3747,6 +3747,7 @@ static int fils_ft_build_assoc_req_rsne(struct wpa_sm *sm, struct wpabuf *buf)
struct rsn_ie_hdr *rsnie;
u16 capab;
u8 *pos;
int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
/* RSNIE[PMKR0Name/PMKR1Name] */
rsnie = wpabuf_put(buf, sizeof(*rsnie));
@ -3814,11 +3815,13 @@ static int fils_ft_build_assoc_req_rsne(struct wpa_sm *sm, struct wpabuf *buf)
if (wpa_derive_pmk_r0(sm->fils_ft, sm->fils_ft_len, sm->ssid,
sm->ssid_len, sm->mobility_domain,
sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
sm->pmk_r0, sm->pmk_r0_name) < 0) {
sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0) {
wpa_printf(MSG_WARNING, "FILS+FT: Could not derive PMK-R0");
return -1;
}
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0", sm->pmk_r0, PMK_LEN);
sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
wpa_hexdump_key(MSG_DEBUG, "FILS+FT: PMK-R0",
sm->pmk_r0, sm->pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FILS+FT: PMKR0Name",
sm->pmk_r0_name, WPA_PMK_NAME_LEN);
wpa_printf(MSG_DEBUG, "FILS+FT: R1KH-ID: " MACSTR,

6
src/rsn_supp/wpa_ft.c
Unescape Escape View File

@ -10,6 +10,7 @@
#include "common.h"
#include "crypto/aes_wrap.h"
#include "crypto/sha384.h"
#include "crypto/random.h"
#include "common/ieee802_11_defs.h"
#include "common/ieee802_11_common.h"
@ -23,6 +24,7 @@ int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
{
u8 ptk_name[WPA_PMK_NAME_LEN];
const u8 *anonce = key->key_nonce;
int use_sha384 = wpa_key_mgmt_sha384(sm->key_mgmt);
if (sm->xxkey_len == 0) {
wpa_printf(MSG_DEBUG, "FT: XXKey not available for key "
@ -30,11 +32,11 @@ int wpa_derive_ptk_ft(struct wpa_sm *sm, const unsigned char *src_addr,
return -1;
}
sm->pmk_r0_len = PMK_LEN;
sm->pmk_r0_len = use_sha384 ? SHA384_MAC_LEN : PMK_LEN;
if (wpa_derive_pmk_r0(sm->xxkey, sm->xxkey_len, sm->ssid,
sm->ssid_len, sm->mobility_domain,
sm->r0kh_id, sm->r0kh_id_len, sm->own_addr,
sm->pmk_r0, sm->pmk_r0_name) < 0)
sm->pmk_r0, sm->pmk_r0_name, use_sha384) < 0)
return -1;
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R0", sm->pmk_r0, sm->pmk_r0_len);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name",

2
wlantest/rx_eapol.c
Unescape Escape View File

@ -109,7 +109,7 @@ static int try_pmk(struct wlantest *wt, struct wlantest_bss *bss,
wpa_derive_pmk_r0(pmk->pmk, PMK_LEN,
bss->ssid, bss->ssid_len, bss->mdid,
bss->r0kh_id, bss->r0kh_id_len,
sta->addr, pmk_r0, pmk_r0_name);
sta->addr, pmk_r0, pmk_r0_name, 0);
wpa_hexdump(MSG_DEBUG, "FT: PMK-R0", pmk_r0, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR0Name", pmk_r0_name,
WPA_PMK_NAME_LEN);

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