Do not fail an ongoing handshake when an invalid EAPoL frame is
received. Instead, follow the intent of 802.11-2020 section 12.7.2:
"EAPOL-Key frames containing invalid field values shall be silently
discarded."
This prevents a denial-of-service attack where receipt of an invalid,
unencrypted EAPoL 1/4 frame generated by an adversary results in iwd
terminating an ongoing connection.
Reported-by: Domien Schepers <schepers.d@northeastern.edu>
Periodic scan requests are meant to be performed with a lower priority
than normal scan requests. They're thus given a different priority when
inserting them into the wiphy work queue. Unfortunately, the priority
is not taken into account when they are inserted into the
sr->requests queue. This can result in the scanning code being confused
since it assumes the top of the queue is always the next scheduled or
currently ongoing scan. As a result any further wiphy_work might never be
started properly.
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 3
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_next() Starting work item 3
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/scan.c:scan_periodic_timeout() 1
Apr 27 16:34:40 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 4
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_insert() Inserting work item 5
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_done() Work item 3 done
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/wiphy.c:wiphy_radio_work_next() Starting work item 5
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_notify() Scan notification Trigger Scan(33)
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_request_triggered() Passive scan triggered for wdev 1
Apr 27 16:34:43 iwd[5117]: ../iwd-1.26/src/scan.c:scan_periodic_triggered() Periodic scan triggered for wdev 1
In the above log, scan request 5 (triggered by dbus) is started before
scan request 4 (periodic scan). Yet the scanning code thinks scan
request 4 was triggered.
Fix this by using the wiphy_work priority to sort the sr->requests queue
so that the scans are ordered in the same manner.
Reported-by: Alvin Šipraga <ALSI@bang-olufsen.dk>
The upstream code immediately retransmitted any no-ACK frames.
This would work in cases where the peer wasn't actively switching
channels (e.g. the ACK was simply lost) but caused unintended
behavior in the case of a channel switch when the peer was not
listening.
If either IWD or the peer needed to switch channels based on the
authenticate request the response may end up not getting ACKed
because the peer is idle, or in the middle of the hardware changing
channels. IWD would get no-ACK and immediately send the frame again
and most likely the same behavior would result. This would very
quickly increment frame_retry past the maximum and DPP would fail.
Instead when no ACK is received wait 1 second before sending out
the next frame. This can re-use the existing frame_pending buffer
and the same logic for re-transmitting.
There is a potential corner case of an offchannel frame callback
being called after ROC has ended.
This could happen in theory if a received frame is queued right as
the ROC session expires. If the ROC cancel event makes it to user
space before the frame IWD will schedule another ROC then receive
the frame. This doesn't prevent IWD from sending out another
frame since OFFCHANNEL_TX_OK is used, but it will prevent IWD from
receiving a response frame since no dwell duration is used with DPP.
To handle this an roc_started bool was added to the dpp_sm which
tracks the ROC state. If dpp_send_frame is called when roc_started
is false the frame will be saved and sent out once the ROC session
is started again.
ConnectHiddenNetwork creates a temporary network object and initiates a
connection with it. If the connection fails (due to an incorrect
passphrase or other reasons), then this temporary object is destroyed.
Delay its destruction until network_disconnected() since
network_connect_failed is called too early. Also, re-order the sequence
in station_reset_connection_state() in order to avoid using the network
object after it has been freed by network_disconnected().
Fixes: 85d9d6461f ("network: Hide hidden networks on connection error")
station_hide_network will remove and free the network object, so calling
network_close_settings will result in a crash. Make sure this is done
prior to network object's destruction.
Fixes: 85d9d6461f ("network: Hide hidden networks on connection error")
If a user connection fails on a freshly scanned psk or open hidden
network, during passphrase request or after, it shall be removed from
the network list. Otherwise, it would be possible to directly connect
to that known network, which will appear as not hidden.
p2p_peer_update_existing may be called with a scan_bss struct built from
a Probe Request frame so it can't access bss->p2p_probe_resp_info even
if peer->bss was built from a Probe Response. Check the source frame
type of the scan_bss struct before updating the Device Address.
This fixes one timing issue that would make the autotest fail often.
Since l_malloc is used the frame contents are not zero'ed automatically
which could result in random bytes being present in the frame which were
expected to be zero. This poses a problem when calculating the MIC as the
crypto operations are done on the entire frame with the expectation of
the MIC being zero.
Fixes: 83212f9b23 ("eapol: change eapol_create_common to support FILS")
explicit_bzero is used in src/storage.c since commit
01cd858760 but src/missing.h is not
included, as a result build with uclibc fails on:
/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/powerpc-buildroot-linux-uclibc/10.3.0/../../../../powerpc-buildroot-linux-uclibc/bin/ld: src/storage.o: in function `storage_init':
storage.c:(.text+0x13a4): undefined reference to `explicit_bzero'
Fixes:
- http://autobuild.buildroot.org/results/2aff8d3d7c33c95e2c57f7c8a71e69939f0580a1
This is used to hold the current BSS frequency which will be
used after IWD receives a presence announcement. Since this was
not being set, the logic was always thinking there was a channel
mismatch (0 != current_freq) and attempting to go offchannel to
'0' which resulted in -EINVAL, and ultimately protocol termination.
The logic here assumed any BSS's in the roam scan were identical to
ones in station's bss_list with the same address. Usually this is true
but, for example, if the BSS changed frequency the one in station's
list is invalid.
Instead when a match is found remove the old BSS and re-insert the new
one.
With the addition of 6GHz '6000' is no longer the maximum frequency
that could be in .known_network.freq. For more robustness
band_freq_to_channel is used to validate the frequency.
Scanning while in AP mode is somewhat of an edge case, but it does
have some usefulness specifically with onboarding new devices, i.e.
a new device starts an AP, a station connects and provides the new
device with network credentials, the new device switches to station
mode and connects to the desired network.
In addition this could be used later for ACS (though this is a bit
overkill for IWD's access point needs).
Since AP performance is basically non-existant while scanning this
feature is meant to be used in a limited scope.
Two DBus API's were added which mirror the station interface: Scan and
GetOrderedNetworks.
Scan is no different than the station variant, and will perform an active
scan on all channels.
GetOrderedNetworks diverges from station and simply returns an array of
dictionaries containing basic information about networks:
{
Name: <ssid>
SignalStrength: <mBm>
Security: <psk, open, or 8021x>
}
Limitations:
- Hidden networks are not supported. This isn't really possible since
the SSID's are unknown from the AP perspective.
- Sharing scan results with station is not supported. This would be a
convenient improvement in the future with respect to onboarding new
devices. The scan could be performed in AP mode, then switch to
station and connect immediately without needing to rescan. A quick
hack could better this situation by not flushing scan results in
station (if the kernel retains these on an iftype change).
This was already implemented in station but with no dependency on
that module at all. AP will need this for a scanning API so its
being moved into scan.c.
The 802.11ax standards adds some restrictions for the 6GHz band. In short
stations must use SAE, OWE, or 8021x on this band and frame protection is
required.
All uses of this macro will work with a bitwise comparison which is
needed for 6GHz checks and somewhat more flexible since it can be
used to compare RSN info, not only single AKM values.
This adds checks if MFP is set to 0 or 1:
0 - Always fail if the frequency is 6GHz
1 - Fail if MFPC=0 and the frequency is 6GHz.
If HW is capable set MFPR=1 for 6GHz
This is a new band defined in the WiFi 6E (ax) amendment. A completely
new value is needed due to channel reuse between 2.4/5 and 6GHz.
util.c needed minimal updating to prevent compile errors which will
be fixed later to actually handle this band. WSC also needed a case
added for 6GHz but the spec does not outline any RF Band value for
6GHz so the 5GHz value will be returned in this case.
sae.c was failing to build on some platforms:
error: implicit declaration of function 'reallocarray'; did you mean 'realloc'?
[-Werror=implicit-function-declaration]
In certain rare cases IWD gets a link down event before nl80211 ever sends
a disconnect event. Netdev notifies station of the link down which causes
station to be freed, but netdev remains in the same state. Then later the
disconnect event arrives and netdev still thinks its connected, calls into
(the now freed) station object and causes a crash.
To fix this netdev_connect_free() is now called on any link down events
which will reset the netdev object to a proper state.
src/netdev.c:netdev_link_notify() event 16 on ifindex 16
src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
src/netdev.c:netdev_link_notify() event 16 on ifindex 16
src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
src/netdev.c:netdev_deauthenticate_event()
src/netdev.c:netdev_link_notify() event 16 on ifindex 16
src/station.c:station_free()
src/netconfig.c:netconfig_destroy()
src/resolve.c:resolve_systemd_revert() ifindex: 16
src/station.c:station_roam_state_clear() 16
src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
src/netdev.c:netdev_disconnect_event()
Received Deauthentication event, reason: 3, from_ap: false
0 0x472fa4 in station_disconnect_event src/station.c:2916
1 0x472fa4 in station_netdev_event src/station.c:2954
2 0x43a262 in netdev_disconnect_event src/netdev.c:1213
3 0x43a262 in netdev_mlme_notify src/netdev.c:5471
4 0x6706eb in process_multicast ell/genl.c:1029
5 0x6706eb in received_data ell/genl.c:1096
6 0x65e630 in io_callback ell/io.c:120
7 0x65a94e in l_main_iterate ell/main.c:478
8 0x65b0b3 in l_main_run ell/main.c:525
9 0x65b0b3 in l_main_run ell/main.c:507
10 0x65b5cc in l_main_run_with_signal ell/main.c:647
11 0x4124d7 in main src/main.c:532
The difference between the existing code is that IWD will send the
authentication request, making it the initiator.
This handles the use case where IWD is provided a peers URI containing
its bootstrapping key rather than IWD always providing its own URI.
A new DBus API was added, ConfigureEnrollee().
Using ConfigureEnrollee() IWD will act as a configurator but begin by
traversing a channel list (URI provided or default) and waiting for
presence announcements (with one caveat). When an announcement is
received IWD will send an authentication request to the peer, receive
its reply, and send an authentication confirm.
As with being a responder, IWD only supports configuration to the
currently connected BSS and will request the enrollee switch to this
BSS's frequency to preserve network performance.
The caveat here is that only one driver (ath9k) supports multicast frame
registration which prevents presence frame from being received. In this
case it will be required the the peer URI contains a MAC and channel
information. This is because IWD will jump right into sending auth
requests rather than waiting for a presence announcement.
The frame watch which covers the presence procedure (and most
frames for that matter) needs to support multicast frames for
presence to work. Doing this in frame-xchg seems like the right
choice but only ath9k supports multicast frame registration.
Because of this limited support DPP will register for these frames
manually.
Parses K (key), M (mac), C (class/channels), and V (version) tokens
into a new structure dpp_uri_info. H/I are not parsed since there
currently isn't any use for them.
