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| author | Jouni Malinen <j@w1.fi> | 2017-10-08 13:18:02 +0300 |
|---|---|---|
| committer | Dan Pasanen <dan.pasanen@gmail.com> | 2017-10-16 10:50:00 -0500 |
| commit | ac7891721bd6f9be777d9db74d4ff2768cfa49a2 (patch) | |
| tree | 38d0bec711e0c4cdc8351c30dc82d7f27a03ece8 | |
| parent | a63055191650b37a68146778bbc3069317784d76 (diff) | |
| download | android_external_wpa_supplicant_8-ac7891721bd6f9be777d9db74d4ff2768cfa49a2.tar.gz android_external_wpa_supplicant_8-ac7891721bd6f9be777d9db74d4ff2768cfa49a2.tar.bz2 android_external_wpa_supplicant_8-ac7891721bd6f9be777d9db74d4ff2768cfa49a2.zip | |
Clear PMK length and check for this when deriving PTK
Instead of setting the default PMK length for the cleared PMK, set the
length to 0 and explicitly check for this when deriving PTK to avoid
unexpected key derivation with an all-zeroes key should it be possible
to somehow trigger PTK derivation to happen before PMK derivation.
Change-Id: Ib5e1e22b2713a8b0d50683a5bfdf9cfad2023eaf
Signed-off-by: Jouni Malinen <j@w1.fi>
| -rw-r--r-- | src/common/wpa_common.c | 5 | ||||
| -rw-r--r-- | src/rsn_supp/wpa.c | 7 |
2 files changed, 9 insertions, 3 deletions
diff --git a/src/common/wpa_common.c b/src/common/wpa_common.c index fa0e6bd2..41a49d0e 100644 --- a/src/common/wpa_common.c +++ b/src/common/wpa_common.c @@ -143,6 +143,11 @@ int wpa_pmk_to_ptk(const u8 *pmk, size_t pmk_len, const char *label, u8 tmp[WPA_KCK_MAX_LEN + WPA_KEK_MAX_LEN + WPA_TK_MAX_LEN]; size_t ptk_len; + if (pmk_len == 0) { + wpa_printf(MSG_ERROR, "WPA: No PMK set for PT derivation"); + return -1; + } + if (os_memcmp(addr1, addr2, ETH_ALEN) < 0) { os_memcpy(data, addr1, ETH_ALEN); os_memcpy(data + ETH_ALEN, addr2, ETH_ALEN); diff --git a/src/rsn_supp/wpa.c b/src/rsn_supp/wpa.c index 18d1dbf0..a22e36da 100644 --- a/src/rsn_supp/wpa.c +++ b/src/rsn_supp/wpa.c @@ -499,7 +499,8 @@ static void wpa_supplicant_process_1_of_4(struct wpa_sm *sm, /* Calculate PTK which will be stored as a temporary PTK until it has * been verified when processing message 3/4. */ ptk = &sm->tptk; - wpa_derive_ptk(sm, src_addr, key, ptk); + if (wpa_derive_ptk(sm, src_addr, key, ptk) < 0) + goto failed; if (sm->pairwise_cipher == WPA_CIPHER_TKIP) { u8 buf[8]; /* Supplicant: swap tx/rx Mic keys */ @@ -2460,8 +2461,8 @@ void wpa_sm_set_pmk_from_pmksa(struct wpa_sm *sm) os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len); } else { wpa_printf(MSG_DEBUG, "WPA: No current PMKSA - clear PMK"); - sm->pmk_len = PMK_LEN; - os_memset(sm->pmk, 0, PMK_LEN); + sm->pmk_len = 0; + os_memset(sm->pmk, 0, PMK_LEN_MAX); } } |