For symmetry with IPv4, save the command id for this netlink command so
we can later add logic to the callback as well as be able to cancel the
command. No functional change in this commit alone.
FT/FILS handle their own PMK derivation but rekeys still require
using the 4-way handshake. There is some ambiguity in the spec whether
or not the PMKID needs to be included in message 1/4 and it appears
that when rekeying after FT/FILS hostapd does not include a PMKID.
The handshake contains the current BSS's RSNE/WPA which may differ
from the FT-over-DS target. When verifying the target BSS's RSNE/WPA
IE needs to be checked, not the current BSS.
If the deauth path was triggered IWD would deauth but end up
calling the connect callback with whatever result netdev had
set, e.g. 'NETDEV_RESULT_OK'. This, of course, caused station
some confusion.
FT-over-DS cannot use OCV due to how the kernel works. This means
we could connect initially with OCVC set, but a FT-over-DS attempt
needs to unset OCVC. Set OCVC false when rebuilding the RSNE for
reassociation.
The FT-over-DS action stage builds an FT-Request which contains an
RSNE. Since FT-over-DS will not support OCV add a boolean to
ft_build_authenticate_ies so the OCVC bit can be disabled rather
than relying on the handshake setting.
This modifies the FT logic to fist call get_oci() before
reassociation. This allows the OCI to be included in reassociation
and in the 4-way handshake later on.
The code path for getting the OCI had to be slightly changed to
handle an OCI that is already set. First the handshake chandef is
NULL'ed out for any new connection. This prevents a stale OCI from
being used. Then some checks were added for this case in
netdev_connect_event and if chandef is already set, start the 4-way
handshake.
netconfig_load_settings is called when establishing a new initial
association to a network. This function tries to update dhcp/dhcpv6
clients with the MAC address of the netdev being used. However, it is
too early to update the MAC here since netdev might need to powercycle
the underlying network device in order to update the MAC (i.e. when
AddressRandomization="network" is used).
If the MAC is set incorrectly, DHCP clients are unable to obtain the
lease properly and station is stuck in "connecting" mode indefinitely.
Fix this by delaying MAC address update until netconfig_configure() is
invoked.
Fixes: ad228461abbf ("netconfig: Move loading settings to new method, refactor")
If the AP advertises FT-over-DS support it likely wants us to use
it. Additionally signal_low is probably going to be true since IWD
has started a roam attempt.
When netdev goes down so does station, but prior to netdev calling
the neighbor report callback. The way the logic was written station
is dereferenced prior to checking for any errors, causing a use
after free.
Since -ENODEV is used in this case check for that early before
accessing station.
This adds a utility to convert a chandef obtained from the kernel into a
3 byte OCI element format containing the operating class, primary
channel and secondary channel center frequency index.
This changes scan_bss from using separate members for each
OWE transition element data type (ssid, ssid_len, and bssid)
to a structure that holds them all.
This is being done because OWE transition has option operating
class and channel bytes which will soon be parsed. This would
end up needing 5 separate members in scan_bss which is a bit
much for a single IE that needs to be parsed.
This makes checking the presense of the IE more convenient
as well since it can be done with a simple NULL pointer check
rather than having to l_memeqzero the BSSID.
These members are currently stored in scan_bss but with the
addition of operating class/band info this will become 5
separate members. This is a bit excessive to store in scan_bss
separately so instead this structure can hold everything related
to the OWE transition IE.
Add a utility for setting the OCI obtained from the hardware (prior to
handshake starting) as well as a utility to validate the OCI obtained
from the peer.
This adds a utility that can convert an operating class + channel
combination to a frequency. Operating class is assumed to be a global
operating class from 802.11 Appendix E4.
This information can be found in Operating Channel Information (OCI) IEs,
as well as OWE Transition Mode IEs.
Calling handshake_state_setup_own_ciphers from within
handshate_state_set_authenticator_ie was misleading. In all cases the
supplicant chooses the AKM. This worked since our AP code only ever
advertises a single AKM, but would not work in the general case.
Similarly, the supplicant would choose which authentication type to use
by either sending the WPA1 or WPA2 IE (or OSEN). Thus the setting of
the related variables in handshake_state_set_authenticator_ie was also
incorrect. In iwd, the supplicant_ie would be set after the
authenticator_ie, so these settings would be overwritten in most cases.
Refactor these two setters so that the supplicant's chosen rsn_info
would be used to drive the handshake.
reallocarray has been added to glibc relatively recently (version 2.26,
from 2017) and apparently not all users run new enough glibc. Moreover,
reallocarray is not available with uclibc-ng. So use realloc if
reallocarray is not available to avoid the following build failure
raised since commit 891b78e9e892a3bcd800eb3a298e6380e9a15dd1:
/home/giuliobenetti/autobuild/run/instance-3/output-1/host/lib/gcc/xtensa-buildroot-linux-uclibc/10.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: src/sae.o: in function `sae_rx_authenticate':
sae.c:(.text+0xd74): undefined reference to `reallocarray'
Fixes:
- http://autobuild.buildroot.org/results/c6d3f86282c44645b4f1c61882dc63ccfc8eb35a
There isn't much control station has with how BSS's are inserted to
a network object. The rank algorithm makes that decision. Because of
this we could end up in a situation where the Open BSS is preferred
over the OWE transition BSS.
In attempt to better handle this any Open BSS in this type of network
will not be chosen unless its the only candidate (e.g. no other BSSs,
inability to connect with OWE, or an improperly configured network).
OWE Transition is described in the WiFi Alliance OWE Specification
version 1.1. The idea behind it is to support both legacy devices
without any concept of OWE as well as modern ones which support the
OWE protocol.
OWE is a somewhat special type of network. Where it advertises an
RSN element but is still "open". This apparently confuses older
devices so the OWE transition procedure was created.
The idea is simple: have two BSS's, one open, and one as a hidden
OWE network. Each network advertises a vendor IE which points to the
other. A device sees the open network and can connect (legacy) or
parse the IE, scan for the hidden OWE network, and connect to that
instead.
Care was taken to handle connections to hidden networks directly.
The policy is being set that any hidden network with the WFA OWE IE
is not connectable via ConnectHiddenNetwork(). These networks are
special, and can only be connected to via the network object for
the paired open network.
When scan results come in from any source (DBus, quick, autoconnect)
each BSS is checked for the OWE Transition IE. A few paths can be
taken here when the IE is found:
1. The BSS is open. The BSSID in the IE is checked against the
current scan results (excluding hidden networks). If a match is
found we should already have the hidden OWE BSS and nothing
else needs to be done (3).
2. The BSS is open. The BSSID in the IE is not found in the
current scan results, and the open network also has no OWE BSS
in it. This will be processed after scan results.
3. The BSS is not open and contains the OWE IE. This BSS will
automatically get added to the network object and nothing else
needs to be done.
After the scan results each network is checked for any non-paired
open BSS's. If found a scan is started for these BSS's per-network.
Once these scan results come in the network is notified.
From here network.c can detect that this is an OWE transition
network and connect to the OWE BSS rather than the open one.
