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FT: Include pairwise cipher suite in PMK-R0 SA and PMK-R1 SA

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This is needed to fix PTK derivation to use correct length. Previously,
64-octet PTK may have been derived if the authenticator did not already
have a STA entry. Now, the correct pairwise cipher suite is learned when
then PMK-R1 SA is received.
master
Jouni Malinen 15 years ago
parent 5205c4f98a
commit 1b484d60e5
2 changed files with 45 additions and 20 deletions
Show Stats Download Patch File Download Diff File

9
src/ap/wpa_auth.h
Unescape Escape View File

@ -47,7 +47,7 @@ struct ft_rrb_frame {
#define FT_R0KH_R1KH_PULL_DATA_LEN 44
#define FT_R0KH_R1KH_RESP_DATA_LEN 76
#define FT_R0KH_R1KH_PUSH_DATA_LEN 80
#define FT_R0KH_R1KH_PUSH_DATA_LEN 88
struct ft_r0kh_r1kh_pull_frame {
u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
@ -74,14 +74,15 @@ struct ft_r0kh_r1kh_resp_frame {
u8 s1kh_id[ETH_ALEN]; /* copied from pull */
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 pad[4]; /* 8-octet boundary for AES key wrap */
le16 pairwise;
u8 pad[2]; /* 8-octet boundary for AES key wrap */
u8 key_wrap_extra[8];
} STRUCT_PACKED;
struct ft_r0kh_r1kh_push_frame {
u8 frame_type; /* RSN_REMOTE_FRAME_TYPE_FT_RRB */
u8 packet_type; /* FT_PACKET_R0KH_R1KH_PUSH */
le16 data_length; /* little endian length of data (80) */
le16 data_length; /* little endian length of data (88) */
u8 ap_address[ETH_ALEN];
/* Encrypted with AES key-wrap */
@ -92,6 +93,8 @@ struct ft_r0kh_r1kh_push_frame {
u8 pmk_r0_name[WPA_PMK_NAME_LEN];
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
le16 pairwise;
u8 pad[6]; /* 8-octet boundary for AES key wrap */
u8 key_wrap_extra[8];
} STRUCT_PACKED;

56
src/ap/wpa_auth_ft.c
Unescape Escape View File

@ -151,6 +151,7 @@ struct wpa_ft_pmk_r0_sa {
u8 pmk_r0[PMK_LEN];
u8 pmk_r0_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
int pmk_r1_pushed;
};
@ -160,6 +161,7 @@ struct wpa_ft_pmk_r1_sa {
u8 pmk_r1[PMK_LEN];
u8 pmk_r1_name[WPA_PMK_NAME_LEN];
u8 spa[ETH_ALEN];
int pairwise; /* Pairwise cipher suite, WPA_CIPHER_* */
/* TODO: expiration, identity, radius_class, EAP type, VLAN ID */
};
@ -205,7 +207,7 @@ void wpa_ft_pmk_cache_deinit(struct wpa_ft_pmk_cache *cache)
static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0,
const u8 *pmk_r0_name)
const u8 *pmk_r0_name, int pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
@ -219,6 +221,7 @@ static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
os_memcpy(r0->pmk_r0, pmk_r0, PMK_LEN);
os_memcpy(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN);
os_memcpy(r0->spa, spa, ETH_ALEN);
r0->pairwise = pairwise;
r0->next = cache->pmk_r0;
cache->pmk_r0 = r0;
@ -229,7 +232,7 @@ static int wpa_ft_store_pmk_r0(struct wpa_authenticator *wpa_auth,
static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r0_name,
u8 *pmk_r0)
u8 *pmk_r0, int *pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r0_sa *r0;
@ -240,6 +243,8 @@ static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
os_memcmp(r0->pmk_r0_name, pmk_r0_name, WPA_PMK_NAME_LEN)
== 0) {
os_memcpy(pmk_r0, r0->pmk_r0, PMK_LEN);
if (pairwise)
*pairwise = r0->pairwise;
return 0;
}
@ -252,7 +257,7 @@ static int wpa_ft_fetch_pmk_r0(struct wpa_authenticator *wpa_auth,
static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1,
const u8 *pmk_r1_name)
const u8 *pmk_r1_name, int pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r1_sa *r1;
@ -266,6 +271,7 @@ static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
os_memcpy(r1->pmk_r1, pmk_r1, PMK_LEN);
os_memcpy(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN);
os_memcpy(r1->spa, spa, ETH_ALEN);
r1->pairwise = pairwise;
r1->next = cache->pmk_r1;
cache->pmk_r1 = r1;
@ -276,7 +282,7 @@ static int wpa_ft_store_pmk_r1(struct wpa_authenticator *wpa_auth,
static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
const u8 *spa, const u8 *pmk_r1_name,
u8 *pmk_r1)
u8 *pmk_r1, int *pairwise)
{
struct wpa_ft_pmk_cache *cache = wpa_auth->ft_pmk_cache;
struct wpa_ft_pmk_r1_sa *r1;
@ -287,6 +293,8 @@ static int wpa_ft_fetch_pmk_r1(struct wpa_authenticator *wpa_auth,
os_memcmp(r1->pmk_r1_name, pmk_r1_name, WPA_PMK_NAME_LEN)
== 0) {
os_memcpy(pmk_r1, r1->pmk_r1, PMK_LEN);
if (pairwise)
*pairwise = r1->pairwise;
return 0;
}
@ -368,13 +376,15 @@ int wpa_auth_derive_ptk_ft(struct wpa_state_machine *sm, const u8 *pmk,
r0kh, r0kh_len, sm->addr, pmk_r0, pmk_r0_name);
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);
wpa_ft_store_pmk_r0(sm->wpa_auth, sm->addr, pmk_r0, pmk_r0_name);
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, pmk_r1_name);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1", pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMKR1Name", pmk_r1_name, WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name);
wpa_ft_store_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1, pmk_r1_name,
sm->pairwise);
wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
sm->wpa_auth->addr, pmk_r1_name,
@ -884,6 +894,7 @@ static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
size_t buflen, ptk_len;
int ret;
u8 *pos, *end;
int pairwise;
*resp_ies = NULL;
*resp_ies_len = 0;
@ -939,8 +950,8 @@ static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
wpa_hexdump(MSG_DEBUG, "FT: Derived requested PMKR1Name",
pmk_r1_name, WPA_PMK_NAME_LEN);
if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1) <
0) {
if (wpa_ft_fetch_pmk_r1(sm->wpa_auth, sm->addr, pmk_r1_name, pmk_r1,
&pairwise) < 0) {
if (wpa_ft_pull_pmk_r1(sm->wpa_auth, sm->addr, sm->r0kh_id,
sm->r0kh_id_len, parse.rsn_pmkid) < 0) {
wpa_printf(MSG_DEBUG, "FT: Did not have matching "
@ -971,7 +982,7 @@ static u16 wpa_ft_process_auth_req(struct wpa_state_machine *sm,
wpa_hexdump(MSG_DEBUG, "FT: Generated ANonce",
sm->ANonce, WPA_NONCE_LEN);
ptk_len = sm->pairwise == WPA_CIPHER_CCMP ? 48 : 64;
ptk_len = pairwise != WPA_CIPHER_CCMP ? 64 : 48;
wpa_pmk_r1_to_ptk(pmk_r1, sm->SNonce, sm->ANonce, sm->addr,
sm->wpa_auth->addr, pmk_r1_name,
(u8 *) &sm->PTK, ptk_len, ptk_name);
@ -1265,6 +1276,7 @@ static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
struct ft_remote_r1kh *r1kh;
struct ft_r0kh_r1kh_resp_frame resp, r;
u8 pmk_r0[PMK_LEN];
int pairwise;
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull");
@ -1312,8 +1324,8 @@ static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
os_memcpy(r.nonce, f.nonce, sizeof(f.nonce));
os_memcpy(r.r1kh_id, f.r1kh_id, FT_R1KH_ID_LEN);
os_memcpy(r.s1kh_id, f.s1kh_id, ETH_ALEN);
if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0) <
0) {
if (wpa_ft_fetch_pmk_r0(wpa_auth, f.s1kh_id, f.pmk_r0_name, pmk_r0,
&pairwise) < 0) {
wpa_printf(MSG_DEBUG, "FT: No matching PMKR0Name found for "
"PMK-R1 pull");
return -1;
@ -1324,6 +1336,7 @@ static int wpa_ft_rrb_rx_pull(struct wpa_authenticator *wpa_auth,
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);
r.pairwise = pairwise;
if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_RESP_DATA_LEN + 7) / 8,
r.nonce, resp.nonce) < 0) {
@ -1345,6 +1358,7 @@ static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
{
struct ft_r0kh_r1kh_resp_frame *frame, f;
struct ft_remote_r0kh *r0kh;
int pairwise;
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 pull response");
@ -1385,16 +1399,19 @@ static int wpa_ft_rrb_rx_resp(struct wpa_authenticator *wpa_auth,
* and call this requests callback function to finish request
* processing */
pairwise = le_to_host16(f.pairwise);
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - nonce",
f.nonce, sizeof(f.nonce));
wpa_printf(MSG_DEBUG, "FT: PMK-R1 pull - R1KH-ID=" MACSTR "S1KH-ID="
MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
MACSTR " pairwise=0x%x",
MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 pull - PMK-R1",
f.pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 pull - PMKR1Name",
f.pmk_r1_name, WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
pairwise);
os_memset(f.pmk_r1, 0, PMK_LEN);
return 0;
@ -1409,6 +1426,7 @@ static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
struct ft_remote_r0kh *r0kh;
struct os_time now;
os_time_t tsend;
int pairwise;
wpa_printf(MSG_DEBUG, "FT: Received PMK-R1 push");
@ -1457,14 +1475,17 @@ static int wpa_ft_rrb_rx_push(struct wpa_authenticator *wpa_auth,
return -1;
}
pairwise = le_to_host16(f.pairwise);
wpa_printf(MSG_DEBUG, "FT: PMK-R1 push - R1KH-ID=" MACSTR " S1KH-ID="
MACSTR, MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id));
MACSTR " pairwise=0x%x",
MAC2STR(f.r1kh_id), MAC2STR(f.s1kh_id), pairwise);
wpa_hexdump_key(MSG_DEBUG, "FT: PMK-R1 push - PMK-R1",
f.pmk_r1, PMK_LEN);
wpa_hexdump(MSG_DEBUG, "FT: PMK-R1 push - PMKR1Name",
f.pmk_r1_name, WPA_PMK_NAME_LEN);
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name);
wpa_ft_store_pmk_r1(wpa_auth, f.s1kh_id, f.pmk_r1, f.pmk_r1_name,
pairwise);
os_memset(f.pmk_r1, 0, PMK_LEN);
return 0;
@ -1594,7 +1615,7 @@ 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,
struct wpa_ft_pmk_r0_sa *pmk_r0,
struct ft_remote_r1kh *r1kh,
const u8 *s1kh_id)
const u8 *s1kh_id, int pairwise)
{
struct ft_r0kh_r1kh_push_frame frame, f;
struct os_time now;
@ -1618,6 +1639,7 @@ static void wpa_ft_generate_pmk_r1(struct wpa_authenticator *wpa_auth,
WPA_PMK_NAME_LEN);
os_get_time(&now);
WPA_PUT_LE32(f.timestamp, now.sec);
f.pairwise = pairwise;
if (aes_wrap(r1kh->key, (FT_R0KH_R1KH_PUSH_DATA_LEN + 7) / 8,
f.timestamp, frame.timestamp) < 0)
return;
@ -1650,7 +1672,7 @@ void wpa_ft_push_pmk_r1(struct wpa_authenticator *wpa_auth, const u8 *addr)
r1kh = wpa_auth->conf.r1kh_list;
while (r1kh) {
wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr);
wpa_ft_generate_pmk_r1(wpa_auth, r0, r1kh, addr, r0->pairwise);
r1kh = r1kh->next;
}
}

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