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FILS: Use FILS Cache Identifier to extend PMKSA applicability

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This allows PMKSA cache entries for FILS-enabled BSSs to be shared
within an ESS when the BSSs advertise the same FILS Cache Identifier
value.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Jouni Malinen 2017-02-21 12:22:19 +02:00 committed by Jouni Malinen
parent 6bb32582df
commit 869af30728
13 changed files with 140 additions and 22 deletions
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66
src/rsn_supp/pmksa_cache.c
View file

@ -117,6 +117,7 @@ static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)
* @spa: Supplicant address
* @network_ctx: Network configuration context for this PMK
* @akmp: WPA_KEY_MGMT_* used in key derivation
* @cache_id: Pointer to FILS Cache Identifier or %NULL if not advertised
* Returns: Pointer to the added PMKSA cache entry or %NULL on error
*
* This function create a PMKSA entry for a new PMK and adds it to the PMKSA
@ -127,7 +128,8 @@ static void pmksa_cache_set_expiration(struct rsn_pmksa_cache *pmksa)
struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
const u8 *pmkid, const u8 *kck, size_t kck_len,
const u8 *aa, const u8 *spa, void *network_ctx, int akmp)
const u8 *aa, const u8 *spa, void *network_ctx, int akmp,
const u8 *cache_id)
{
struct rsn_pmksa_cache_entry *entry;
struct os_reltime now;
@ -157,6 +159,10 @@ pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
entry->reauth_time = now.sec + pmksa->sm->dot11RSNAConfigPMKLifetime *
pmksa->sm->dot11RSNAConfigPMKReauthThreshold / 100;
entry->akmp = akmp;
if (cache_id) {
entry->fils_cache_id_set = 1;
os_memcpy(entry->fils_cache_id, cache_id, FILS_CACHE_ID_LEN);
}
os_memcpy(entry->aa, aa, ETH_ALEN);
entry->network_ctx = network_ctx;
@ -362,7 +368,9 @@ pmksa_cache_clone_entry(struct rsn_pmksa_cache *pmksa,
new_entry = pmksa_cache_add(pmksa, old_entry->pmk, old_entry->pmk_len,
NULL, NULL, 0,
aa, pmksa->sm->own_addr,
old_entry->network_ctx, old_entry->akmp);
old_entry->network_ctx, old_entry->akmp,
old_entry->fils_cache_id_set ?
old_entry->fils_cache_id : NULL);
if (new_entry == NULL)
return NULL;
@ -410,6 +418,24 @@ pmksa_cache_get_opportunistic(struct rsn_pmksa_cache *pmksa, void *network_ctx,
}
static struct rsn_pmksa_cache_entry *
pmksa_cache_get_fils_cache_id(struct rsn_pmksa_cache *pmksa,
const void *network_ctx, const u8 *cache_id)
{
struct rsn_pmksa_cache_entry *entry;
for (entry = pmksa->pmksa; entry; entry = entry->next) {
if (network_ctx == entry->network_ctx &&
entry->fils_cache_id_set &&
os_memcmp(cache_id, entry->fils_cache_id,
FILS_CACHE_ID_LEN) == 0)
return entry;
}
return NULL;
}
/**
* pmksa_cache_get_current - Get the current used PMKSA entry
* @sm: Pointer to WPA state machine data from wpa_sm_init()
@ -442,11 +468,12 @@ void pmksa_cache_clear_current(struct wpa_sm *sm)
* @bssid: BSSID for PMKSA or %NULL if not used
* @network_ctx: Network configuration context
* @try_opportunistic: Whether to allow opportunistic PMKSA caching
* @fils_cache_id: Pointer to FILS Cache Identifier or %NULL if not used
* Returns: 0 if PMKSA was found or -1 if no matching entry was found
*/
int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
const u8 *bssid, void *network_ctx,
int try_opportunistic)
int try_opportunistic, const u8 *fils_cache_id)
{
struct rsn_pmksa_cache *pmksa = sm->pmksa;
wpa_printf(MSG_DEBUG, "RSN: PMKSA cache search - network_ctx=%p "
@ -457,6 +484,10 @@ int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
if (bssid)
wpa_printf(MSG_DEBUG, "RSN: Search for BSSID " MACSTR,
MAC2STR(bssid));
if (fils_cache_id)
wpa_printf(MSG_DEBUG,
"RSN: Search for FILS Cache Identifier %02x%02x",
fils_cache_id[0], fils_cache_id[1]);
sm->cur_pmksa = NULL;
if (pmkid)
@ -469,6 +500,10 @@ int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
sm->cur_pmksa = pmksa_cache_get_opportunistic(pmksa,
network_ctx,
bssid);
if (sm->cur_pmksa == NULL && fils_cache_id)
sm->cur_pmksa = pmksa_cache_get_fils_cache_id(pmksa,
network_ctx,
fils_cache_id);
if (sm->cur_pmksa) {
wpa_hexdump(MSG_DEBUG, "RSN: PMKSA cache entry found - PMKID",
sm->cur_pmksa->pmkid, PMKID_LEN);
@ -495,11 +530,20 @@ int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
char *pos = buf;
struct rsn_pmksa_cache_entry *entry;
struct os_reltime now;
int cache_id_used = 0;
for (entry = pmksa->pmksa; entry; entry = entry->next) {
if (entry->fils_cache_id_set) {
cache_id_used = 1;
break;
}
}
os_get_reltime(&now);
ret = os_snprintf(pos, buf + len - pos,
"Index / AA / PMKID / expiration (in seconds) / "
"opportunistic\n");
"opportunistic%s\n",
cache_id_used ? " / FILS Cache Identifier" : "");
if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
@ -514,12 +558,24 @@ int pmksa_cache_list(struct rsn_pmksa_cache *pmksa, char *buf, size_t len)
pos += ret;
pos += wpa_snprintf_hex(pos, buf + len - pos, entry->pmkid,
PMKID_LEN);
ret = os_snprintf(pos, buf + len - pos, " %d %d\n",
ret = os_snprintf(pos, buf + len - pos, " %d %d",
(int) (entry->expiration - now.sec),
entry->opportunistic);
if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
if (entry->fils_cache_id_set) {
ret = os_snprintf(pos, buf + len - pos, " %02x%02x",
entry->fils_cache_id[0],
entry->fils_cache_id[1]);
if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
}
ret = os_snprintf(pos, buf + len - pos, "\n");
if (os_snprintf_error(buf + len - pos, ret))
return pos - buf;
pos += ret;
entry = entry->next;
}
return pos - buf;

19
src/rsn_supp/pmksa_cache.h
View file

@ -21,6 +21,14 @@ struct rsn_pmksa_cache_entry {
int akmp; /* WPA_KEY_MGMT_* */
u8 aa[ETH_ALEN];
/*
* If FILS Cache Identifier is included (fils_cache_id_set), this PMKSA
* cache entry is applicable to all BSSs (any BSSID/aa[]) that
* advertise the same FILS Cache Identifier within the same ESS.
*/
u8 fils_cache_id[2];
unsigned int fils_cache_id_set:1;
os_time_t reauth_time;
/**
@ -59,7 +67,8 @@ struct rsn_pmksa_cache_entry * pmksa_cache_head(struct rsn_pmksa_cache *pmksa);
struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
const u8 *pmkid, const u8 *kck, size_t kck_len,
const u8 *aa, const u8 *spa, void *network_ctx, int akmp);
const u8 *aa, const u8 *spa, void *network_ctx, int akmp,
const u8 *cache_id);
struct rsn_pmksa_cache_entry *
pmksa_cache_add_entry(struct rsn_pmksa_cache *pmksa,
struct rsn_pmksa_cache_entry *entry);
@ -67,7 +76,7 @@ struct rsn_pmksa_cache_entry * pmksa_cache_get_current(struct wpa_sm *sm);
void pmksa_cache_clear_current(struct wpa_sm *sm);
int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
const u8 *bssid, void *network_ctx,
int try_opportunistic);
int try_opportunistic, const u8 *fils_cache_id);
struct rsn_pmksa_cache_entry *
pmksa_cache_get_opportunistic(struct rsn_pmksa_cache *pmksa,
void *network_ctx, const u8 *aa);
@ -123,7 +132,8 @@ pmksa_cache_add_entry(struct rsn_pmksa_cache *pmksa,
static inline struct rsn_pmksa_cache_entry *
pmksa_cache_add(struct rsn_pmksa_cache *pmksa, const u8 *pmk, size_t pmk_len,
const u8 *pmkid, const u8 *kck, size_t kck_len,
const u8 *aa, const u8 *spa, void *network_ctx, int akmp)
const u8 *aa, const u8 *spa, void *network_ctx, int akmp,
const u8 *cache_id)
{
return NULL;
}
@ -135,7 +145,8 @@ static inline void pmksa_cache_clear_current(struct wpa_sm *sm)
static inline int pmksa_cache_set_current(struct wpa_sm *sm, const u8 *pmkid,
const u8 *bssid,
void *network_ctx,
int try_opportunistic)
int try_opportunistic,
const u8 *fils_cache_id)
{
return -1;
}

2
src/rsn_supp/preauth.c
View file

@ -97,7 +97,7 @@ static void rsn_preauth_eapol_cb(struct eapol_sm *eapol,
NULL, 0,
sm->preauth_bssid, sm->own_addr,
sm->network_ctx,
WPA_KEY_MGMT_IEEE8021X);
WPA_KEY_MGMT_IEEE8021X, NULL);
} else {
wpa_msg(sm->ctx->msg_ctx, MSG_INFO,
"RSN: failed to get master session key from "

26
src/rsn_supp/wpa.c
View file

@ -315,6 +315,13 @@ static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
}
if (res == 0) {
struct rsn_pmksa_cache_entry *sa = NULL;
const u8 *fils_cache_id = NULL;
#ifdef CONFIG_FILS
if (sm->fils_cache_id_set)
fils_cache_id = sm->fils_cache_id;
#endif /* CONFIG_FILS */
wpa_hexdump_key(MSG_DEBUG, "WPA: PMK from EAPOL state "
"machines", sm->pmk, pmk_len);
sm->pmk_len = pmk_len;
@ -327,7 +334,8 @@ static int wpa_supplicant_get_pmk(struct wpa_sm *sm,
NULL, 0,
src_addr, sm->own_addr,
sm->network_ctx,
sm->key_mgmt);
sm->key_mgmt,
fils_cache_id);
}
if (!sm->cur_pmksa && pmkid &&
pmksa_cache_get(sm->pmksa, src_addr, pmkid, NULL))
@ -1371,7 +1379,7 @@ static void wpa_supplicant_process_3_of_4(struct wpa_sm *sm,
sa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len, NULL,
sm->ptk.kck, sm->ptk.kck_len,
sm->bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt);
sm->network_ctx, sm->key_mgmt, NULL);
if (!sm->cur_pmksa)
sm->cur_pmksa = sa;
}
@ -2573,7 +2581,7 @@ void wpa_sm_set_pmk(struct wpa_sm *sm, const u8 *pmk, size_t pmk_len,
if (bssid) {
pmksa_cache_add(sm->pmksa, pmk, pmk_len, pmkid, NULL, 0,
bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt);
sm->network_ctx, sm->key_mgmt, NULL);
}
}
@ -2656,6 +2664,15 @@ void wpa_sm_set_config(struct wpa_sm *sm, struct rsn_supp_config *config)
sm->wpa_ptk_rekey = config->wpa_ptk_rekey;
sm->p2p = config->p2p;
sm->wpa_rsc_relaxation = config->wpa_rsc_relaxation;
#ifdef CONFIG_FILS
if (config->fils_cache_id) {
sm->fils_cache_id_set = 1;
os_memcpy(sm->fils_cache_id, config->fils_cache_id,
FILS_CACHE_ID_LEN);
} else {
sm->fils_cache_id_set = 0;
}
#endif /* CONFIG_FILS */
} else {
sm->network_ctx = NULL;
sm->peerkey_enabled = 0;
@ -3456,7 +3473,8 @@ int fils_process_auth(struct wpa_sm *sm, const u8 *bssid, const u8 *data,
sm->cur_pmksa = pmksa_cache_add(sm->pmksa, sm->pmk, sm->pmk_len,
sm->fils_erp_pmkid, NULL, 0,
sm->bssid, sm->own_addr,
sm->network_ctx, sm->key_mgmt);
sm->network_ctx, sm->key_mgmt,
NULL);
}
if (!sm->cur_pmksa) {

1
src/rsn_supp/wpa.h
View file

@ -109,6 +109,7 @@ struct rsn_supp_config {
int wpa_ptk_rekey;
int p2p;
int wpa_rsc_relaxation;
const u8 *fils_cache_id;
};
#ifndef CONFIG_NO_WPA

2
src/rsn_supp/wpa_i.h
View file

@ -148,7 +148,9 @@ struct wpa_sm {
size_t fils_key_auth_len;
unsigned int fils_completed:1;
unsigned int fils_erp_pmkid_set:1;
unsigned int fils_cache_id_set:1;
u8 fils_erp_pmkid[PMKID_LEN];
u8 fils_cache_id[FILS_CACHE_ID_LEN];
#endif /* CONFIG_FILS */
};

16
wpa_supplicant/bss.c
View file

@ -1317,3 +1317,19 @@ int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates)
*rates = r;
return len;
}
#ifdef CONFIG_FILS
const u8 * wpa_bss_get_fils_cache_id(struct wpa_bss *bss)
{
const u8 *ie;
if (bss) {
ie = wpa_bss_get_ie(bss, WLAN_EID_FILS_INDICATION);
if (ie && ie[1] >= 4 && WPA_GET_LE16(ie + 2) & BIT(7))
return ie + 4;
}
return NULL;
}
#endif /* CONFIG_FILS */

1
wpa_supplicant/bss.h
View file

@ -145,6 +145,7 @@ int wpa_bss_get_max_rate(const struct wpa_bss *bss);
int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates);
struct wpa_bss_anqp * wpa_bss_anqp_alloc(void);
int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss);
const u8 * wpa_bss_get_fils_cache_id(struct wpa_bss *bss);
static inline int bss_is_dmg(const struct wpa_bss *bss)
{

2
wpa_supplicant/events.c
View file

@ -327,7 +327,7 @@ static void wpa_find_assoc_pmkid(struct wpa_supplicant *wpa_s)
for (i = 0; i < ie.num_pmkid; i++) {
pmksa_set = pmksa_cache_set_current(wpa_s->wpa,
ie.pmkid + i * PMKID_LEN,
NULL, NULL, 0);
NULL, NULL, 0, NULL);
if (pmksa_set == 0) {
eapol_sm_notify_pmkid_attempt(wpa_s->eapol);
break;

4
wpa_supplicant/preauth_test.c
View file

@ -344,8 +344,8 @@ int main(int argc, char *argv[])
if (preauth_test.auth_timed_out)
ret = -2;
else {
ret = pmksa_cache_set_current(wpa_s.wpa, NULL, bssid, NULL, 0)
? 0 : -3;
ret = pmksa_cache_set_current(wpa_s.wpa, NULL, bssid, NULL, 0,
NULL) ? 0 : -3;
}
test_eapol_clean(&wpa_s);

16
wpa_supplicant/sme.c
View file

@ -301,13 +301,19 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
wpa_bss_get_ie(bss, WLAN_EID_RSN)) &&
wpa_key_mgmt_wpa(ssid->key_mgmt)) {
int try_opportunistic;
const u8 *cache_id = NULL;
try_opportunistic = (ssid->proactive_key_caching < 0 ?
wpa_s->conf->okc :
ssid->proactive_key_caching) &&
(ssid->proto & WPA_PROTO_RSN);
#ifdef CONFIG_FILS
if (wpa_key_mgmt_fils(ssid->key_mgmt))
cache_id = wpa_bss_get_fils_cache_id(bss);
#endif /* CONFIG_FILS */
if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
wpa_s->current_ssid,
try_opportunistic) == 0)
try_opportunistic, cache_id) == 0)
eapol_sm_notify_pmkid_attempt(wpa_s->eapol);
wpa_s->sme.assoc_req_ie_len = sizeof(wpa_s->sme.assoc_req_ie);
if (wpa_supplicant_set_suites(wpa_s, bss, ssid,
@ -516,8 +522,8 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
#ifdef CONFIG_SAE
if (!skip_auth && params.auth_alg == WPA_AUTH_ALG_SAE &&
pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid, ssid, 0) == 0)
{
pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid, ssid, 0,
NULL) == 0) {
wpa_dbg(wpa_s, MSG_DEBUG,
"PMKSA cache entry found - try to use PMKSA caching instead of new SAE authentication");
params.auth_alg = WPA_AUTH_ALG_OPEN;
@ -552,7 +558,9 @@ static void sme_send_authentication(struct wpa_supplicant *wpa_s,
if (params.auth_alg == WPA_AUTH_ALG_OPEN &&
wpa_key_mgmt_fils(ssid->key_mgmt)) {
if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
ssid, 0) == 0)
ssid, 0,
wpa_bss_get_fils_cache_id(bss)) ==
0)
wpa_printf(MSG_DEBUG,
"SME: Try to use FILS with PMKSA caching");
resp = fils_build_auth(wpa_s->wpa);

2
wpa_supplicant/wpa_supplicant.c
View file

@ -2290,7 +2290,7 @@ static void wpas_start_assoc_cb(struct wpa_radio_work *work, int deinit)
ssid->proactive_key_caching) &&
(ssid->proto & WPA_PROTO_RSN);
if (pmksa_cache_set_current(wpa_s->wpa, NULL, bss->bssid,
ssid, try_opportunistic) == 0)
ssid, try_opportunistic, NULL) == 0)
eapol_sm_notify_pmkid_attempt(wpa_s->eapol);
wpa_ie_len = sizeof(wpa_ie);
if (wpa_supplicant_set_suites(wpa_s, bss, ssid,

5
wpa_supplicant/wpas_glue.c
View file

@ -1232,6 +1232,11 @@ void wpa_supplicant_rsn_supp_set_config(struct wpa_supplicant *wpa_s,
}
#endif /* CONFIG_P2P */
conf.wpa_rsc_relaxation = wpa_s->conf->wpa_rsc_relaxation;
#ifdef CONFIG_FILS
if (wpa_key_mgmt_fils(wpa_s->key_mgmt))
conf.fils_cache_id =
wpa_bss_get_fils_cache_id(wpa_s->current_bss);
#endif /* CONFIG_FILS */
}
wpa_sm_set_config(wpa_s->wpa, ssid ? &conf : NULL);
}