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authorJohannes Berg <johannes.berg@intel.com>2017-09-05 14:54:54 +0200
committerJohannes Berg <johannes.berg@intel.com>2017-10-16 13:02:03 +0200
commitfdf7cb4185b60c68e1a75e61691c4afdc15dea0e (patch)
tree65428a5a3961cae26521908dc9cdece90eb4cca0
parentc0576e3975084d4699b7bfef578613fb8e1144f6 (diff)
downloadlinux-fdf7cb4185b60c68e1a75e61691c4afdc15dea0e.tar.bz2
mac80211: accept key reinstall without changing anything
When a key is reinstalled we can reset the replay counters etc. which can lead to nonce reuse and/or replay detection being impossible, breaking security properties, as described in the "KRACK attacks". In particular, CVE-2017-13080 applies to GTK rekeying that happened in firmware while the host is in D3, with the second part of the attack being done after the host wakes up. In this case, the wpa_supplicant mitigation isn't sufficient since wpa_supplicant doesn't know the GTK material. In case this happens, simply silently accept the new key coming from userspace but don't take any action on it since it's the same key; this keeps the PN replay counters intact. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
-rw-r--r--net/mac80211/key.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/net/mac80211/key.c b/net/mac80211/key.c
index a98fc2b5e0dc..ae995c8480db 100644
--- a/net/mac80211/key.c
+++ b/net/mac80211/key.c
@@ -4,7 +4,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007-2008 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
- * Copyright 2015 Intel Deutschland GmbH
+ * Copyright 2015-2017 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -620,9 +620,6 @@ int ieee80211_key_link(struct ieee80211_key *key,
pairwise = key->conf.flags & IEEE80211_KEY_FLAG_PAIRWISE;
idx = key->conf.keyidx;
- key->local = sdata->local;
- key->sdata = sdata;
- key->sta = sta;
mutex_lock(&sdata->local->key_mtx);
@@ -633,6 +630,21 @@ int ieee80211_key_link(struct ieee80211_key *key,
else
old_key = key_mtx_dereference(sdata->local, sdata->keys[idx]);
+ /*
+ * Silently accept key re-installation without really installing the
+ * new version of the key to avoid nonce reuse or replay issues.
+ */
+ if (old_key && key->conf.keylen == old_key->conf.keylen &&
+ !memcmp(key->conf.key, old_key->conf.key, key->conf.keylen)) {
+ ieee80211_key_free_unused(key);
+ ret = 0;
+ goto out;
+ }
+
+ key->local = sdata->local;
+ key->sdata = sdata;
+ key->sta = sta;
+
increment_tailroom_need_count(sdata);
ieee80211_key_replace(sdata, sta, pairwise, old_key, key);
@@ -648,6 +660,7 @@ int ieee80211_key_link(struct ieee80211_key *key,
ret = 0;
}
+ out:
mutex_unlock(&sdata->local->key_mtx);
return ret;