In some situations its convenient for the same work item to be
inserted (rescheduled) while its in progress. FT for example does
this now if a roam fails. The same ft_work item gets re-inserted
which, currently, is not safe to do since the item is modified
and removed once completed.
Fix this by introducing wiphy_radio_work_reschedule which is an
explicit API for re-inserting work items from within the do_work
callback.
The wiphy work logic was changed around slightly to remove the item
at the head of the queue prior to starting and note the ID going
into do_work. If do_work signaled done and ID changed we know it
was re-inserted and can skip the destroy logic and move onto the
next item. If the item is not done continue as normal but set the
priority to INT_MIN, as usual, to prevent other items from getting
to the head of the queue.
This adds another radio so IWD hits the FT failure path after
authentication to the first BSS fails. This causes a wiphy work
item to be rescheduled which previously was unsafe.
If IWD connects under bad RF conditions and netconfig takes
a while to complete (e.g. slow DHCP), the roam timeout
could fire before DHCP is done. Then, after the roam,
IWD would transition automatically to connected before
DHCP was finished. In theory DHCP could still complete after
this point but any process depending on IWD's connected
state would be uninformed and assume IP networking is up.
Fix this by stopping netconfig prior to a roam if IWD is not
in a connected state. Then, once the roam either failed or
succeeded, start netconfig again.
iwctl quit (running quit non-interactively) isn't a useful command,
but it shouldn't segfault. Let's avoid calling readline functions if
we haven't initialized readline in this run.
When acting as a configurator the enrollee can start on a different
channel than IWD is connected to. IWD will begin the auth process
on this channel but tell the enrollee to transition to the current
channel after the auth request. Since a configurator must be
connected (a requirement IWD enforces) we can assume a channel
transition will always be to the currently connected channel. This
allows us to simply cancel the offchannel request and wait for a
response (rather than start another offchannel).
Doing this improves the DPP performance and reduces the potential
for a lost frame during the channel transition.
This patch also addresses the comment that we should wait for the
auth request ACK before canceling the offchannel. Now a flag is
set and IWD will cancel the offchannel once the ACK is received.
If IWD gets a disconnect during FT the roaming state will be
cleared, as well as any ft_info's during ft_clear_authentications.
This includes canceling the offchannel operation which also
destroys any pending ft_info's if !info->parsed. This causes a
double free afterwards. In addition the l_queue_remove inside the
foreach callback is not a safe operation either.
To fix this don't remove the ft_info inside the offchannel
destroy callback. The info will get freed by ft_associate regardless
of the outcome (parsed or !parsed). This is also consistent with
how the onchannel logic works.
Log and crash backtrace below:
iwd[488]: src/station.c:station_try_next_transition() 5, target aa:46:8d:37:7c:87
iwd[488]: src/wiphy.c:wiphy_radio_work_insert() Inserting work item 16668
iwd[488]: src/wiphy.c:wiphy_radio_work_insert() Inserting work item 16669
iwd[488]: src/wiphy.c:wiphy_radio_work_done() Work item 16667 done
iwd[488]: src/wiphy.c:wiphy_radio_work_next() Starting work item 16668
iwd[488]: src/netdev.c:netdev_mlme_notify() MLME notification Remain on Channel(55)
iwd[488]: src/netdev.c:netdev_mlme_notify() MLME notification Del Station(20)
iwd[488]: src/netdev.c:netdev_link_notify() event 16 on ifindex 5
iwd[488]: src/netdev.c:netdev_mlme_notify() MLME notification Deauthenticate(39)
iwd[488]: src/netdev.c:netdev_deauthenticate_event()
iwd[488]: src/netdev.c:netdev_mlme_notify() MLME notification Disconnect(48)
iwd[488]: src/netdev.c:netdev_disconnect_event()
iwd[488]: Received Deauthentication event, reason: 6, from_ap: true
iwd[488]: src/station.c:station_disconnect_event() 5
iwd[488]: src/station.c:station_disassociated() 5
iwd[488]: src/station.c:station_reset_connection_state() 5
iwd[488]: src/station.c:station_roam_state_clear() 5
iwd[488]: double free or corruption (fasttop)
5 0x0000555b3dbf44a4 in ft_info_destroy ()
6 0x0000555b3dbf45b3 in remove_ifindex ()
7 0x0000555b3dc4653c in l_queue_foreach_remove ()
8 0x0000555b3dbd0dd1 in station_reset_connection_state ()
9 0x0000555b3dbd37e5 in station_disassociated ()
10 0x0000555b3dbc8bb8 in netdev_mlme_notify ()
11 0x0000555b3dc4e80b in received_data ()
12 0x0000555b3dc4b430 in io_callback ()
13 0x0000555b3dc4a5ed in l_main_iterate ()
14 0x0000555b3dc4a6bc in l_main_run ()
15 0x0000555b3dc4a8e0 in l_main_run_with_signal ()
16 0x0000555b3dbbe888 in main ()
Hostapd commit bc36991791 now properly sets the secure bit on
message 1/4. This was addressed in an earlier IWD commit but
neglected to allow for backwards compatibility. The check is
fatal which now breaks earlier hostapd version (older than 2.10).
Instead warn on this condition rather than reject the rekey.
Fixes: 7fad6590bd ("eapol: allow 'secure' to be set on rekeys")
After adding prefix matching the rule structure contained allocated
memory which was not being cleaned up on exit if rules still
remained in the list (removing the rule via DBus was done correctly)
The following commit:
80db8fd86c ("build: Use -Wvariadic-macros warning")
added a warning about variadic-macros. But it isn't quite clear why
since variadic macros are used throghout iwd. GCC doesn't honor this
option, but clang does. Since there's no real reason to stop using
variadic macros at this time, drop this warning.
The HT40+/- flags were reversed when checking against the 802.11
behavior flags.
HT40+ means the secondary channel is above (+) the primary channel
therefore corresponds to the PRIMARY_CHANNEL_LOWER behavior. And
the opposite for HT40-.
Reported-By: Alagu Sankar <alagusankar@gmail.com>
Use a more appropriate printf conversion string in order to avoid
unnecessary implicit conversion which can lead to a buffer overflow.
Reasons similar to commit:
98b758f893 ("knownnetworks: fix printing SSID in hex")
In the case that the FT target is on the same channel as we're currently
operating on, use ft_authenticate_onchannel instead of ft_authenticate.
Going offchannel in this case can confuse some drivers.
Currently when we try FT-over-Air, the Authenticate frame is always
sent via offchannel infrastructure We request the driver to go
offchannel, then send the Authenticate frame. This works fine as long
as the target AP is on a different channel. On some networks some (or
all) APs might actually be located on the same channel. In this case
going offchannel will result in some drivers not actually sending the
Authenticate frame until after the offchannel operation completes.
Work around this by introducing a new ft_authenticate variant that will
not request an offchannel operation first.
Force conversion to unsigned char before printing to avoid sign
extension when printing SSID in hex. For example, if there are CJK
characters in SSID, it will generate a very long string like
/net/connman/iwd/ffffffe8ffffffaeffffffa1.
If a very long ssid was used (e.g. CJK characters in SSID), it might do
out of bounds write to static variable for lack of checking the position
before the last snprintf() call.
Seeing that some authenticators can't handle TLS session caching
properly, allow the EAP-TLS-based methods session caching support to be
disabled per-network using a method specific FastReauthentication setting.
Defaults to true.
With the previous commit, authentication should succeed at least every
other attempt. I'd also expect that EAP-TLS is not usually affected
because there's no phase2, unlike with EAP-PEAP/EAP-TTLS.
If we have a TLS session cached from this attempt or a previous
successful connection attempt but the overall EAP method fails, forget
the session to improve the chances that authentication succeeds on the
next attempt considering that some authenticators strangely allow
resumption but can't handle it all the way to EAP method success.
Logically the session resumption in the TLS layers on the server should
be transparent to the EAP layers so I guess those may be failed
attempts to further optimise phase 2 when the server thinks it can
already trust the client.
The extra IE length for the WMM IE was being set to 26 which is
the HT IE length, not WMM. Fix this and use the proper size for
the WMM IE of 50 bytes.
This shouldn't have caused any problems prior as the tail length
is always allocated with 256 or 512 extra bytes of headroom.
Since channels numbers are used as indexes into the array, and given
that channel numbers start at '1' instead of 0, make sure to allocate a
buffer large enough to not overflow when the max channel number for a
given band is accessed.
src/manager.c:manager_wiphy_dump_callback() New wiphy phy1 added (1)
==22290== Invalid write of size 2
==22290== at 0x4624B2: nl80211_parse_supported_frequencies (nl80211util.c:570)
==22290== by 0x417CA5: parse_supported_bands (wiphy.c:1636)
==22290== by 0x418594: wiphy_parse_attributes (wiphy.c:1805)
==22290== by 0x418E20: wiphy_update_from_genl (wiphy.c:1991)
==22290== by 0x464589: manager_wiphy_dump_callback (manager.c:564)
==22290== by 0x4CBDDA: process_unicast (genl.c:944)
==22290== by 0x4CC19C: received_data (genl.c:1056)
==22290== by 0x4C7140: io_callback (io.c:120)
==22290== by 0x4C5A97: l_main_iterate (main.c:476)
==22290== by 0x4C5BDC: l_main_run (main.c:523)
==22290== by 0x4C5F0F: l_main_run_with_signal (main.c:645)
==22290== by 0x40503B: main (main.c:600)
==22290== Address 0x4aa76ec is 0 bytes after a block of size 28 alloc'd
==22290== at 0x48417B5: malloc (vg_replace_malloc.c:393)
==22290== by 0x4BC4D1: l_malloc (util.c:62)
==22290== by 0x417BE4: parse_supported_bands (wiphy.c:1619)
==22290== by 0x418594: wiphy_parse_attributes (wiphy.c:1805)
==22290== by 0x418E20: wiphy_update_from_genl (wiphy.c:1991)
==22290== by 0x464589: manager_wiphy_dump_callback (manager.c:564)
==22290== by 0x4CBDDA: process_unicast (genl.c:944)
==22290== by 0x4CC19C: received_data (genl.c:1056)
==22290== by 0x4C7140: io_callback (io.c:120)
==22290== by 0x4C5A97: l_main_iterate (main.c:476)
==22290== by 0x4C5BDC: l_main_run (main.c:523)
==22290== by 0x4C5F0F: l_main_run_with_signal (main.c:645)
==22290==
This adds support for rekeys to AP mode. A single timer is used and
reset to the next station needing a rekey. A default rekey timer of
600 seconds is used unless the profile sets a timeout.
The only changes required was to set the secure bit for message 1,
reset the frame retry counter, and change the 2/4 verifier to use
the rekey flag rather than ptk_complete. This is because we must
set ptk_complete false in order to detect retransmissions of the
4/4 frame.
Initiating a rekey can now be done by simply calling eapol_start().
