From 114d124186f652b3eb55d7dc00da740e4df756e0 Mon Sep 17 00:00:00 2001 From: Jouni Malinen Date: Fri, 28 Feb 2020 16:37:28 +0200 Subject: [PATCH] SAE: Fix PMKID derivation for OKC SAE authentication derives PMKID differently from the EAP cases. The value comes from information exchanged during SAE authentication and does not bind in the MAC addresses of the STAs. As such, the same PMKID is used with different BSSIDs. Fix both the hostapd and wpa_supplicant to use the previous PMKID as is for OKC instead of deriving a new PMKID using an incorrect derivation method when using an SAE AKM. This fixes use of opportunistic key caching with SAE. Signed-off-by: Jouni Malinen --- src/ap/pmksa_cache_auth.c | 5 +++++ src/rsn_supp/pmksa_cache.c | 5 ++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/src/ap/pmksa_cache_auth.c b/src/ap/pmksa_cache_auth.c index 15e2c4943..fe5f81717 100644 --- a/src/ap/pmksa_cache_auth.c +++ b/src/ap/pmksa_cache_auth.c @@ -516,6 +516,11 @@ struct rsn_pmksa_cache_entry * pmksa_cache_get_okc( for (entry = pmksa->pmksa; entry; entry = entry->next) { if (os_memcmp(entry->spa, spa, ETH_ALEN) != 0) continue; + if (wpa_key_mgmt_sae(entry->akmp)) { + if (os_memcmp(entry->pmkid, pmkid, PMKID_LEN) == 0) + return entry; + continue; + } rsn_pmkid(entry->pmk, entry->pmk_len, aa, spa, new_pmkid, entry->akmp); if (os_memcmp(new_pmkid, pmkid, PMKID_LEN) == 0) diff --git a/src/rsn_supp/pmksa_cache.c b/src/rsn_supp/pmksa_cache.c index cd4b0508f..862fdec02 100644 --- a/src/rsn_supp/pmksa_cache.c +++ b/src/rsn_supp/pmksa_cache.c @@ -371,9 +371,12 @@ pmksa_cache_clone_entry(struct rsn_pmksa_cache *pmksa, { struct rsn_pmksa_cache_entry *new_entry; os_time_t old_expiration = old_entry->expiration; + const u8 *pmkid = NULL; + if (wpa_key_mgmt_sae(old_entry->akmp)) + pmkid = old_entry->pmkid; new_entry = pmksa_cache_add(pmksa, old_entry->pmk, old_entry->pmk_len, - NULL, NULL, 0, + pmkid, NULL, 0, aa, pmksa->sm->own_addr, old_entry->network_ctx, old_entry->akmp, old_entry->fils_cache_id_set ? -- 2.39.2