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2127425434
While these changes are not included in the advisory, upstream encourages users to merge them. See http://lists.infradead.org/pipermail/hostap/2017-October/037989.html Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
54 lines
1.8 KiB
Diff
54 lines
1.8 KiB
Diff
From b488a12948751f57871f09baa345e59b23959a41 Mon Sep 17 00:00:00 2001
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From: Jouni Malinen <j@w1.fi>
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Date: Sun, 8 Oct 2017 13:18:02 +0300
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Subject: [PATCH] Clear PMK length and check for this when deriving PTK
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Instead of setting the default PMK length for the cleared PMK, set the
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length to 0 and explicitly check for this when deriving PTK to avoid
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unexpected key derivation with an all-zeroes key should it be possible
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to somehow trigger PTK derivation to happen before PMK derivation.
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Signed-off-by: Jouni Malinen <j@w1.fi>
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---
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src/common/wpa_common.c | 5 +++++
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src/rsn_supp/wpa.c | 7 ++++---
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2 files changed, 9 insertions(+), 3 deletions(-)
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--- a/src/common/wpa_common.c
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+++ b/src/common/wpa_common.c
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@@ -225,6 +225,11 @@ int wpa_pmk_to_ptk(const u8 *pmk, size_t
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u8 tmp[WPA_KCK_MAX_LEN + WPA_KEK_MAX_LEN + WPA_TK_MAX_LEN];
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size_t ptk_len;
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+ if (pmk_len == 0) {
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+ wpa_printf(MSG_ERROR, "WPA: No PMK set for PT derivation");
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+ return -1;
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+ }
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+
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if (os_memcmp(addr1, addr2, ETH_ALEN) < 0) {
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os_memcpy(data, addr1, ETH_ALEN);
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os_memcpy(data + ETH_ALEN, addr2, ETH_ALEN);
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--- a/src/rsn_supp/wpa.c
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+++ b/src/rsn_supp/wpa.c
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@@ -584,7 +584,8 @@ static void wpa_supplicant_process_1_of_
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/* Calculate PTK which will be stored as a temporary PTK until it has
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* been verified when processing message 3/4. */
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ptk = &sm->tptk;
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- wpa_derive_ptk(sm, src_addr, key, ptk);
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+ if (wpa_derive_ptk(sm, src_addr, key, ptk) < 0)
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+ goto failed;
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if (sm->pairwise_cipher == WPA_CIPHER_TKIP) {
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u8 buf[8];
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/* Supplicant: swap tx/rx Mic keys */
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@@ -2705,8 +2706,8 @@ void wpa_sm_set_pmk_from_pmksa(struct wp
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sm->pmk_len = sm->cur_pmksa->pmk_len;
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os_memcpy(sm->pmk, sm->cur_pmksa->pmk, sm->pmk_len);
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} else {
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- sm->pmk_len = PMK_LEN;
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- os_memset(sm->pmk, 0, PMK_LEN);
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+ sm->pmk_len = 0;
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+ os_memset(sm->pmk, 0, PMK_LEN_MAX);
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}
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}
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