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cfg80211: Fix Extended Key ID key install checks 

Fix two shortcomings in the Extended Key ID API:

 1) Allow the userspace to install pairwise keys using keyid 1 without
    NL80211_KEY_NO_TX set. This allows the userspace to install and
    activate pairwise keys with keyid 1 in the same way as for keyid 0,
    simplifying the API usage for e.g. FILS and FT key installs.

 2) IEEE 802.11 - 2016 restricts Extended Key ID usage to CCMP/GCMP
    ciphers in IEEE 802.11 - 2016 "9.4.2.25.4 RSN capabilities".
    Enforce that when installing a key.

Cc: stable@vger.kernel.org # 5.2
Fixes: 6cdd3979a2 ("nl80211/cfg80211: Extended Key ID support")
Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
Link: https://lore.kernel.org/r/20190805123400.51567-1-alexander@wetzel-home.de
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexander Wetzel 2019-08-05 14:34:00 +02:00 committed by Johannes Berg
parent 5fd2f91ad4
commit b67fd72e84
1 changed files with 14 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
net/wireless/util.c
View File

@ -233,25 +233,30 @@ int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
switch (params->cipher) {
case WLAN_CIPHER_SUITE_TKIP:
/* Extended Key ID can only be used with CCMP/GCMP ciphers */
if ((pairwise && key_idx) ||
params->mode != NL80211_KEY_RX_TX)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
/* IEEE802.11-2016 allows only 0 and - when using Extended Key
* ID - 1 as index for pairwise keys.
/* IEEE802.11-2016 allows only 0 and - when supporting
* Extended Key ID - 1 as index for pairwise keys.
* @NL80211_KEY_NO_TX is only allowed for pairwise keys when
* the driver supports Extended Key ID.
* @NL80211_KEY_SET_TX can't be set when installing and
* validating a key.
*/
if (params->mode == NL80211_KEY_NO_TX) {
if (!wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_EXT_KEY_ID))
if ((params->mode == NL80211_KEY_NO_TX && !pairwise) ||
params->mode == NL80211_KEY_SET_TX)
return -EINVAL;
if (wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_EXT_KEY_ID)) {
if (pairwise && (key_idx < 0 || key_idx > 1))
return -EINVAL;
else if (!pairwise || key_idx < 0 || key_idx > 1)
return -EINVAL;
} else if ((pairwise && key_idx) ||
params->mode == NL80211_KEY_SET_TX) {
} else if (pairwise && key_idx) {
return -EINVAL;
}
break;