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nl80211: Migrate from set_tx to key_flag API

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Migrate nl80211 driver to key_flag API and add additional sanity checks.

I'm still not sure why we install unicast WEP keys also as default
unicast keys. Based on how I understand how mac80211 handles that it
should be pointless. I just stuck to how we do things prior to the patch
for WEP keys to not break anything. After all other drivers may need it.

Signed-off-by: Alexander Wetzel <alexander@wetzel-home.de>
This commit is contained in:
Alexander Wetzel 2020-03-04 18:16:56 +01:00 committed by Jouni Malinen
parent 9757f18db4
commit 81621eab7c
1 changed files with 44 additions and 14 deletions
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58
src/drivers/driver_nl80211.c
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@ -3055,7 +3055,7 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
struct nl_msg *msg;
struct nl_msg *key_msg;
int ret;
int tdls = 0;
int skip_set_key = 1;
const char *ifname = params->ifname;
enum wpa_alg alg = params->alg;
const u8 *addr = params->addr;
@ -3066,6 +3066,7 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
const u8 *key = params->key;
size_t key_len = params->key_len;
int vlan_id = params->vlan_id;
enum key_flag key_flag = params->key_flag;
/* Ignore for P2P Device */
if (drv->nlmode == NL80211_IFTYPE_P2P_DEVICE)
@ -3073,15 +3074,17 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
ifindex = if_nametoindex(ifname);
wpa_printf(MSG_DEBUG, "%s: ifindex=%d (%s) alg=%d addr=%p key_idx=%d "
"set_tx=%d seq_len=%lu key_len=%lu",
"set_tx=%d seq_len=%lu key_len=%lu key_flag=0x%x",
__func__, ifindex, ifname, alg, addr, key_idx, set_tx,
(unsigned long) seq_len, (unsigned long) key_len);
(unsigned long) seq_len, (unsigned long) key_len, key_flag);
#ifdef CONFIG_TDLS
if (key_idx == -1) {
if (key_idx == -1)
key_idx = 0;
tdls = 1;
}
#endif /* CONFIG_TDLS */
if (check_key_flag(key_flag)) {
wpa_printf(MSG_DEBUG, "%s: invalid key_flag", __func__);
return -EINVAL;
}
#ifdef CONFIG_DRIVER_NL80211_QCA
if (alg == WPA_ALG_PMK &&
@ -3096,13 +3099,23 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
if (alg == WPA_ALG_PMK &&
(drv->capa.flags & WPA_DRIVER_FLAGS_4WAY_HANDSHAKE_8021X))
return nl80211_set_pmk(drv, key, key_len, addr);
if (key_flag & KEY_FLAG_PMK) {
/* The driver does not have any offload mechanism for PMK, so
* there is no need to configure this key. */
return 0;
}
ret = -ENOBUFS;
key_msg = nlmsg_alloc();
if (!key_msg)
return ret;
if (alg == WPA_ALG_NONE) {
if (alg == WPA_ALG_NONE && (key_flag & KEY_FLAG_RX_TX)) {
wpa_printf(MSG_DEBUG, "%s: invalid key_flag to delete key",
__func__);
ret = -EINVAL;
goto fail2;
} else if (alg == WPA_ALG_NONE) {
msg = nl80211_ifindex_msg(drv, ifindex, 0, NL80211_CMD_DEL_KEY);
if (!msg)
goto fail2;
@ -3135,14 +3148,33 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
if (nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, addr))
goto fail;
if (alg != WPA_ALG_WEP && key_idx && !set_tx) {
if ((key_flag & KEY_FLAG_GROUP_MASK) == KEY_FLAG_GROUP_RX) {
wpa_printf(MSG_DEBUG, " RSN IBSS RX GTK");
if (nla_put_u32(key_msg, NL80211_KEY_TYPE,
NL80211_KEYTYPE_GROUP))
goto fail;
} else if (!(key_flag & KEY_FLAG_PAIRWISE)) {
wpa_printf(MSG_DEBUG,
" key_flag missing PAIRWISE when setting a pairwise key");
ret = -EINVAL;
goto fail;
} else if (alg == WPA_ALG_WEP &&
(key_flag & KEY_FLAG_RX_TX) == KEY_FLAG_RX_TX) {
wpa_printf(MSG_DEBUG, " unicast WEP key");
skip_set_key = 0;
} else {
wpa_printf(MSG_DEBUG, " pairwise key");
}
} else if (addr && is_broadcast_ether_addr(addr)) {
} else if ((key_flag & KEY_FLAG_PAIRWISE) ||
!(key_flag & KEY_FLAG_GROUP)) {
wpa_printf(MSG_DEBUG,
" invalid key_flag for a broadcast key");
ret = -EINVAL;
goto fail;
} else {
wpa_printf(MSG_DEBUG, " broadcast key");
if (key_flag & KEY_FLAG_DEFAULT)
skip_set_key = 0;
}
if (nla_put_u8(key_msg, NL80211_KEY_IDX, key_idx) ||
nla_put_nested(msg, NL80211_ATTR_KEY, key_msg))
@ -3165,14 +3197,12 @@ static int wpa_driver_nl80211_set_key(struct i802_bss *bss,
ret, strerror(-ret));
/*
* If we failed or don't need to set the default TX key (below),
* If we failed or don't need to set the key as default (below),
* we're done here.
*/
if (ret || !set_tx || alg == WPA_ALG_NONE || tdls)
return ret;
if (is_ap_interface(drv->nlmode) && addr &&
!is_broadcast_ether_addr(addr))
if (ret || skip_set_key)
return ret;
wpa_printf(MSG_DEBUG, "nl80211: NL80211_CMD_SET_KEY - default key");
ret = -ENOBUFS;
key_msg = nlmsg_alloc();