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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
Download patch file Download diff file Expand all files Collapse all files

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 */
};