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OKC with Suite B AKMPs in hostapd

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To support Opportunistic Key Caching for Suite B key management, KCK
needs to be stored on PMKSA to derive the new PMKID correctly when
processing reassociation from a STA to a new AP.

Signed-off-by: Jouni Malinen <quic_jouni@quicinc.com>
This commit is contained in:
Jouni Malinen 2023-10-30 19:52:06 +02:00 committed by Jouni Malinen
parent 0c9df339f5
commit aac288914e
2 changed files with 17 additions and 2 deletions
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17
src/ap/pmksa_cache_auth.c
View file

@ -334,6 +334,10 @@ pmksa_cache_auth_create_entry(const u8 *pmk, size_t pmk_len, const u8 *pmkid,
return NULL;
os_memcpy(entry->pmk, pmk, pmk_len);
entry->pmk_len = pmk_len;
if (kck && kck_len && kck_len < WPA_KCK_MAX_LEN) {
os_memcpy(entry->kck, kck, kck_len);
entry->kck_len = kck_len;
}
if (pmkid)
os_memcpy(entry->pmkid, pmkid, PMKID_LEN);
else if (akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192)
@ -525,8 +529,17 @@ struct rsn_pmksa_cache_entry * pmksa_cache_get_okc(
return entry;
continue;
}
rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa, new_pmkid,
entry->akmp);
if (entry->akmp == WPA_KEY_MGMT_IEEE8021X_SUITE_B_192 &&
entry->kck_len > 0)
rsn_pmkid_suite_b_192(entry->kck, entry->kck_len,
aa, spa, new_pmkid);
else if (wpa_key_mgmt_suite_b(entry->akmp) &&
entry->kck_len > 0)
rsn_pmkid_suite_b(entry->kck, entry->kck_len, aa, spa,
new_pmkid);
else
rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa,
new_pmkid, entry->akmp);
if (os_memcmp(new_pmkid, pmkid, PMKID_LEN) == 0)
return entry;
}

2
src/ap/pmksa_cache_auth.h
View file

@ -19,6 +19,8 @@ struct rsn_pmksa_cache_entry {
u8 pmkid[PMKID_LEN];
u8 pmk[PMK_LEN_MAX];
size_t pmk_len;
u8 kck[WPA_KCK_MAX_LEN];
size_t kck_len;
os_time_t expiration;
int akmp; /* WPA_KEY_MGMT_* */
u8 spa[ETH_ALEN];