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netdev: fixed key setting failure

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If netdev fails to set the keys, there was no way for device/ap to
know. A new handshake event was added for this. The key setting
failure function was also fixed to support both AP/station iftypes.
It will now automatically send either a disconnect or del_station
depending on the interface type.

In similar manner, netdev_handshake_failed was also modified to
support both AP/station iftypes. Now, any handshake event listeners
should call netdev_handshake_failed upon a handshake failure
event, including AP.
This commit is contained in:
James Prestwood 2018-07-03 14:36:33 -07:00 committed by Denis Kenzior
parent d4e521027b
commit b2f27f3abe
6 changed files with 67 additions and 22 deletions
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16
src/ap.c
View File

@ -151,6 +151,16 @@ static bool ap_sta_match_addr(const void *a, const void *b)
return !memcmp(sta->addr, b, 6);
}
static void ap_remove_sta(struct sta_state *sta)
{
if (!l_queue_remove(sta->ap->sta_states, sta)) {
l_error("tried to remove station that doesnt exist");
return;
}
ap_sta_free(sta);
}
static void ap_set_sta_cb(struct l_genl_msg *msg, void *user_data)
{
if (l_genl_msg_get_error(msg) < 0)
@ -398,8 +408,10 @@ static void ap_handshake_event(struct handshake_state *hs,
ap_new_rsna(sta);
break;
case HANDSHAKE_EVENT_FAILED:
ap_deauthenticate_sta(sta, l_get_u16(event_data));
break;
netdev_handshake_failed(hs, l_get_u16(event_data));
/* fall through */
case HANDSHAKE_EVENT_SETTING_KEYS_FAILED:
ap_remove_sta(sta);
default:
break;
}

4
src/device.c
View File

@ -670,9 +670,9 @@ static void device_handshake_event(struct handshake_state *hs,
network_sync_psk(network);
break;
case HANDSHAKE_EVENT_FAILED:
netdev_handshake_failed(device_get_netdev(device),
l_get_u16(event_data));
netdev_handshake_failed(hs, l_get_u16(event_data));
break;
case HANDSHAKE_EVENT_SETTING_KEYS_FAILED:
case HANDSHAKE_EVENT_COMPLETE:
/*
* currently we dont care about any other events. The

1
src/handshake.h
View File

@ -45,6 +45,7 @@ enum handshake_kde {
enum handshake_event {
HANDSHAKE_EVENT_STARTED,
HANDSHAKE_EVENT_SETTING_KEYS,
HANDSHAKE_EVENT_SETTING_KEYS_FAILED,
HANDSHAKE_EVENT_COMPLETE,
HANDSHAKE_EVENT_FAILED
};

61
src/netdev.c
View File

@ -893,6 +893,25 @@ static struct l_genl_msg *netdev_build_cmd_deauthenticate(struct netdev *netdev,
return msg;
}
static struct l_genl_msg *netdev_build_cmd_del_station(struct netdev *netdev,
const uint8_t *sta,
uint16_t reason_code,
bool disassociate)
{
struct l_genl_msg *msg;
uint8_t subtype = disassociate ?
MPDU_MANAGEMENT_SUBTYPE_DISASSOCIATION :
MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION;
msg = l_genl_msg_new_sized(NL80211_CMD_DEL_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &netdev->index);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta);
l_genl_msg_append_attr(msg, NL80211_ATTR_MGMT_SUBTYPE, 1, &subtype);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
return msg;
}
static void netdev_operstate_cb(bool success, void *user_data)
{
struct netdev *netdev = user_data;
@ -945,14 +964,21 @@ static void netdev_setting_keys_failed(struct netdev_handshake_state *nhs,
netdev->result = NETDEV_RESULT_KEY_SETTING_FAILED;
if (netdev->type != NL80211_IFTYPE_STATION)
return;
handshake_event(&nhs->super, HANDSHAKE_EVENT_SETTING_KEYS_FAILED, NULL);
msg = netdev_build_cmd_disconnect(netdev,
MMPDU_REASON_CODE_UNSPECIFIED);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
msg = netdev_build_cmd_disconnect(netdev, reason_code);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_connect_failed,
netdev, NULL);
break;
case NL80211_IFTYPE_AP:
msg = netdev_build_cmd_del_station(netdev, nhs->super.spa,
reason_code, false);
if (!l_genl_family_send(nl80211, msg, NULL, NULL, NULL))
l_error("error sending DEL_STATION");
}
}
static void netdev_set_station_cb(struct l_genl_msg *msg, void *user_data)
@ -1277,8 +1303,11 @@ invalid_key:
netdev_setting_keys_failed(nhs, rc);
}
void netdev_handshake_failed(struct netdev *netdev, uint16_t reason_code)
void netdev_handshake_failed(struct handshake_state *hs, uint16_t reason_code)
{
struct netdev_handshake_state *nhs =
container_of(hs, struct netdev_handshake_state, super);
struct netdev *netdev = nhs->netdev;
struct l_genl_msg *msg;
l_error("4-Way handshake failed for ifindex: %d, reason: %u",
@ -1288,13 +1317,19 @@ void netdev_handshake_failed(struct netdev *netdev, uint16_t reason_code)
netdev->result = NETDEV_RESULT_HANDSHAKE_FAILED;
if (netdev->type != NL80211_IFTYPE_STATION)
return;
msg = netdev_build_cmd_disconnect(netdev, reason_code);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_connect_failed,
netdev, NULL);
switch (netdev->type) {
case NL80211_IFTYPE_STATION:
msg = netdev_build_cmd_disconnect(netdev, reason_code);
netdev->disconnect_cmd_id = l_genl_family_send(nl80211, msg,
netdev_connect_failed,
netdev, NULL);
break;
case NL80211_IFTYPE_AP:
msg = netdev_build_cmd_del_station(netdev, nhs->super.spa,
reason_code, false);
if (!l_genl_family_send(nl80211, msg, NULL, NULL, NULL))
l_error("error sending DEL_STATION");
}
}
static void hardware_rekey_cb(struct l_genl_msg *msg, void *data)

2
src/netdev.h
View File

@ -145,7 +145,7 @@ uint32_t netdev_frame_watch_add(struct netdev *netdev, uint16_t frame_type,
void *user_data);
bool netdev_frame_watch_remove(struct netdev *netdev, uint32_t id);
void netdev_handshake_failed(struct netdev *netdev, uint16_t reason_code);
void netdev_handshake_failed(struct handshake_state *hs, uint16_t reason_code);
struct netdev *netdev_find(int ifindex);

5
src/wsc.c
View File

@ -387,12 +387,9 @@ static void wsc_netdev_event(struct netdev *netdev, enum netdev_event event,
static void wsc_handshake_event(struct handshake_state *hs,
enum handshake_event event, void *event_data, void *user_data)
{
struct wsc *wsc = user_data;
switch (event) {
case HANDSHAKE_EVENT_FAILED:
netdev_handshake_failed(device_get_netdev(wsc->device),
l_get_u16(event_data));
netdev_handshake_failed(hs, l_get_u16(event_data));
break;
default:
break;