Previously resp was a simple array of bytes allocated on the stack.
This was changed to a dynamically allocated array, but the sizeof(resp)
argument to ap_build_beacon_pr_head() was never changed appropriately.
Fix this by introducing a new resp_len variable that holds the number of
bytes allocated for resp. Also, move the allocation after the basic
sanity checks have been performed to avoid allocating/freeing memory
unnecessarily.
Fixes: 18a63f91fd ("ap: Write extra frame IEs from the user")
Prior to this netdev_connect_ok set setting this which really
only applies to station mode. In addition this happens for each
new station that connects to the AP. Instead set the operstate /
link mode when AP starts and stops.
Change ap_start to load all of the AP configuration from a struct
l_settings, moving the 6 or so parameters from struct ap_config members
to the l_settings groups and keys. This extends the ap profile concept
used for the DHCP settings. ap_start callers create the l_settings
object and fill the values in it or read the settings in from a file.
Since ap_setup_dhcp and ap_load_profile_and_dhcp no longer do the
settings file loading, they needed to be refactored and some issues were
fixed in their logic, e.g. l_dhcp_server_set_ip_address() was never
called when the "IP pool" was used. Also the IP pool was previously only
used if the ap->config->profile was NULL and this didn't match what the
docs said:
"If [IPv4].Address is not provided and no IP address is set on the
interface prior to calling StartProfile the IP pool will be used."
It was seen that some full mac cards/drivers do not include any
rate information with the NEW_STATION event. This was causing
the NEW_STATION event to be ignored, preventing AP mode from
working on these cards.
Since the full mac path does not even require sta->rates the
parsing can be removed completely.
Make the WSC IE processing and writing more self-contained (i.e. so that
it can be more easily moved to a separate file if desired) by using the
new ap_write_extra_ies() mechanism.
Pass the string IEs from the incoming STA association frames to
the user in the AP event data. I drop
ap_event_station_added_data.rsn_ie because that probably wasn't
going to ever be useful and the RSN IE is included in the .assoc_ies
array in any case.
There is no functional change here but checking the return
value makes static analysis much happier. Checking the
return and setting the default inside the if clause is also
consistent with how IWD does it many other places.
The diagnostic interface serves no purpose until the AP has
been started. Any calls on it will return an error so instead
it makes more sense to bring it up when the AP is started, and
down when the AP is stopped.
Its useful being able to refer to the network Name/SSID once
an AP is started. For example opening an iwctl session with an
already started AP provides no way of obtaining the SSID.
Rather than the previous hack which disabled group traffic it
was found that the GTK RSC could be manually set to zero which
allows group traffic. This appears to fix AP mode on brcmfmac
along with the previous fixes. This is not documented in
nl80211, but appears to work with this driver.
This is how a fullmac card tells userspace that a station has
left. This fixes the issue where the same client cannot re-connect
to the same AP multiple times. ap_new_station was renamed to
ap_handle_new_station for consistency.
Some fullmac cards were found to be buggy with getting the GTK
where it returns a BIP key for the GTK index, even after creating
a GTK with NEW_KEY explicitly. In an effort to get these cards
semi-working we can treat this just as a warning and continue with
the handshake without a GTK set which disables group traffic. A
warning is printed in this case so the user is not completely in
the dark.
Since fullmac cards handle auth/assoc in firmware IWD must
react differently while in AP mode just as it does in station.
For fullmac cards a NEW_STATION event is emitted post association
and from here the 4-way handshake can begin. In this NEW_STATION
handler a new sta_state is created and the needed members are
set in order to inject us back into the normal code execution
for softmac post association (i.e. creating group keys and
starting the 4-way handshake). From here everything works the
same as softmac.
This adds a new AccessPointDiagnostic interface. This interface
provides similar low level functionality as StationDiagnostic, but
for when IWD is in AP mode. This uses netdev_get_all_stations
which will dump all stations, parse, and return each station in
an individual callback. Once the dump is complete the destroy is
called and all data is packaged as an array of dictionaries.
handshake_state_set_authenticator_ie must be called to set group_cipher
in struct handshake_shake before handshake_set_gtk_state, otherwise
handshake_set_gtk_state is unable to determine the key length to set
handshake state gtk.
Fixes: 4bc20a0979 ("ap: Start EAP-WSC authentication with WSC enrollees")
If EnableNetworkConfiguration was enabled ap.c required that
APRanges also be set. This prevents IWD from starting which
effects a perfectly valid station configuration. Instead if
APRanges is not provided IWD still allows ap_init to pass but
DHCP just will not be enabled.
Users can now supply an AP provisioning file containing an [IPv4]
section and define various DHCP settings:
[IPv4]
Address=<address>
Netmask=<netmask>
Gateway=<gateway>
IPRange=<start_address>,<end_address>
DNSList=<dns1>,<dns2>,...<dnsN>
LeaseTime=<lease_time>
There are a few notes/requirements to keep in mind when using a
provisioning file:
- All settings are optional but [IPv4].Address is required if the
interface does not already have an address set.
- If no [IPv4].Address is defined in the provisioning file and the AP
interface does not already have an address set, StartWithConfig()
will fail with -EINVAL.
- If a provisioning file is provided it will take precedence, and the
AP will not pull from the IP pool.
- A provisioning file containing an IPv4 section assumes DHCP is being
enabled and will override [General].EnableNetworkConfiguration.
- Any address that AP sets on the interface will be deleted when the AP
is stopped.
Users can now start an AP from settings based on a profile
on disk. The only argument is the SSID which will be used to
lookup the profile. If no profile is found a NotFound error
will be returned. Any invalid profiles will result in an
Invalid return.
The DHCP server can be enabled by enabling network configuration
with [General].EnableNetworkConfiguration. If an IP is not set
on the interface before the AP is started a valid IP range must
also be provided under [General].APRanges in IP prefix format e.g.
[General]
EnableNetworkConfiguration=true
APRanges=192.168.1.1/24
Each AP started will get assigned a new subnet within the range
specified by APRanges as to not conflict with other AP interfaces.
If there are no subnets left in the pool when an AP is started
it will fail with -EEXIST. Any AP's that are stopped will release
their subnet back into the pool to be used with other APs.
The DHCP IP pool will be automatically chosen by the ELL DHCP
implementation (+1 the AP's IP to *.254). The remaining DHCP
settings will be defaults chosen by ELL (DNS, lease time, etc).
Convert ap_send_mgmt_frame() to use frame_xchg_start for sending frames,
this fixes among other things the ACK-received checks.
One side effect is that we're no longer sending Probe Responses with the
don't-wait-for-ack flag because frame-xchg doesn't support it, but other
AP implementations don't use that flag either.
Another side-effect is that we do use the no-cck-rate flag
unconditionally, something we may want to fix but would need to add
another parameter to frame-xchg.
Add a "psk" setting to allow the user to pass the binary PSK directly
instead of generating it from the passphrase and the SSID. In that case
we'll only send the PSK to WSC enrollees.
explicit_bzero is used in src/ap.c since commit
d55e00b31d but src/missing.h is not
included, as a result build with uclibc fails on:
/srv/storage/autobuild/run/instance-1/output-1/host/lib/gcc/xtensa-buildroot-linux-uclibc/9.3.0/../../../../xtensa-buildroot-linux-uclibc/bin/ld: src/ap.o: in function `ap_probe_req_cb':
ap.c:(.text+0x23d8): undefined reference to `explicit_bzero'
Fixes:
- http://autobuild.buildroot.org/results/c7a0096a269bfc52bd8e23d453d36d5bfb61441d
Add the special case "DIRECT-" SSID, called the P2P Wildcard SSID, in
ap_probe_req_cb so as not to reject those Probe Requests on the basis of
ssid mismatch. I'd have preferred to keep all the P2P-specific bits in
p2p.c but in this case there's little point in adding a generic
config setting for SSID-matching quirks.
Check the conditions for PBC enrollee registration when we receive the
Association Request with WSC IE and indicate to the enrollee whether we
accept the association using a WSC IE in the Association Response.
After this, a NULL sta->assoc_rsne indicates that the station is not
establishing the RSNA and is a WSC enrollee.
Implement the caching of WSC probe requests -- when an Enrollee later
associates to start registration we need to have its Probe Request on
file. Also use this cache for PBC "Session Overlap" detection.
This adds the API for putting the AP in Push Button mode, which we'll
need to P2P GO side but may be useful on its own too. A WSC IE is added
to our beacons and probe responses indicating whether the PBC mode is
active.
On a new association or re-association, in addition to forgetting a
complete RSN Association, also stop the EAPoL SM to stop any ongoing
handshake.
Do this in a new function ap_stop_handshake that is now used in a few
places that had copies of the same few lines. I'll be adding some more
lines to this function for WSC support.
Setting 'match' false wouldn't do anything because it was already false.
If the frame is addressed to some other non-broadcast address ignore it
directly and exit ap_probe_req_cb.
To limit the number of ap_start parameters, group basic AP config
parameters in the ap_config struct that is passed as a pointer and owned
by the ap_state.
On the supplicant side eapol_register would only register the eapol_sm
on a given netdev to start receiving frames and an eapol_start call is
required for the state machine to start executing. On the authenticator
side we shouldn't have the "early frame" problem but there's no reason
for the semantics of the two methods to be different. Somehow we were
doing everything in eapol_register and not using eapol_start if
hs->authenticator was true, so bring this in line with the supplicant
side and require eapol_start to be called also from ap.c.
Convert the handshake event callback type to use variable argument
list to allow for more flexibility in event-specific arguments
passed to the callbacks.
Note the uint16_t reason code is promoted to an int when using variable
arguments so va_arg(args, int) has to be used.
The handshake object had 4 setters for authenticator/supplicant IE.
Since the IE ultimately gets put into the same buffer, there really
only needs to be a single setter for authenticator/supplicant. The
handshake object can deal with parsing to decide what kind of IE it
is (WPA or RSN).
AP still relies on the get_data/set_length semantics. Its more convenient
to still use these since it avoids the need for extra temporary buffers
when building the rates IE.
The TLV builder APIs were not very intuative, and in some (or all)
cases required access to the builder structure directly, either to
set the TLV buffer or to get the buffer at the end.
This change adds a new API, ie_tlv_builder_set_data, which both sets
the length for the current TLV and copies the TLV data in one go.
This will avoid the need for memcpy(ie_tlv_builder_get_data(...),...)
ie_tlv_builder_finalize was also changed to return a pointer to the
start of the build buffer. This will eliminate the need to access
builder.tlv after building the TLVs.
ie_tlv_builder_init was changed to take an optional buffer to hold
the TLV data. Passing NULL/0 will build the TLV in the internal
buffer. Passing in a pointer and length will build into the passed
in buffer.
Supported rates will soon be parsed along with HT/VHT capabilities
to determine the best data rate. This will remove the need for the
supported_rates uintset element in scan_bss, as well as the single
API to only parse the supported rates IE. AP still does rely on
this though (since it only supports basic rates), so the parsing
function was moved into ap.c.
The AP structure was getting cleaned up twice. When the DBus stop method came
in we do AP_STOP on nl80211. In this callback the AP was getting freed in
ap_reset. Also when the DBus interface was cleaned up it triggered ap_reset.
Since ap->started gets set to false in ap_reset, we now check this and bail
out if the AP is already stopped.
Fixes:
++++++++ backtrace ++++++++
0 0x7f099c11ef20 in /lib/x86_64-linux-gnu/libc.so.6
1 0x43fed0 in l_queue_foreach() at ell/queue.c:441 (discriminator 3)
2 0x423a6c in ap_reset() at src/ap.c:140
3 0x423b69 in ap_free() at src/ap.c:162
4 0x44ee86 in interface_instance_free() at ell/dbus-service.c:513
5 0x451730 in _dbus_object_tree_remove_interface() at ell/dbus-service.c:1650
6 0x405c07 in netdev_newlink_notify() at src/netdev.c:4449 (discriminator 9)
7 0x440775 in l_hashmap_foreach() at ell/hashmap.c:534
8 0x4455d3 in process_broadcast() at ell/netlink.c:158
9 0x4439b3 in io_callback() at ell/io.c:126
10 0x442c4e in l_main_iterate() at ell/main.c:473
11 0x442d1c in l_main_run() at ell/main.c:516
12 0x442f2b in l_main_run_with_signal() at ell/main.c:644
13 0x403ab3 in main() at src/main.c:504
14 0x7f099c101b97 in /lib/x86_64-linux-gnu/libc.so.6
+++++++++++++++++++++++++++
AdHoc will also need the same functionality to verify and parse the
key sequence from GET_KEY. This block of code was moved from AP's
GET_KEY callback into nl80211_parse_get_key_seq.
Netdev/AP share several NL80211 commands and each has their own
builder API's. These were moved into a common file nl80211_util.[ch].
A helper was added to AP for building NEW_STATION to make the associate
callback look cleaner (rather than manually building NEW_STATION).
Set a default GTK cipher type same as our current PTK type, generate a
random GTK when the first STA connects and set it up in the kernel, then
pass the values that EAPoL is going to need to the handshake_state.
As a consequence of the previous commit, netdev watches are always
called when the device object is valid. As a result, we can drop the
netdev_get_device calls and checks from individual AP/AdHoc/Station/WSC
netdev watches
Since the interfaces are not supposed to exist when the device is DOWN
(we destroy the interfaces on NETDEV_WATCH_EVENT_DOWN too), don't
create the interfaces if the device hasn't been brought up yet.
To avoid confusion in case of an authenticator side handshake_state
structure and eapol_sm structure, rename own_ie to supplicant_ie and
ap_ie to authenticator_ie. Also rename
handshake_state_set_{own,ap}_{rsn,wpa} and fix when we call
handshake_state_setup_own_ciphers. As a result
handshake_state_set_authenticator, if needed, should be called before
handshake_state_set_{own,ap}_{rsn,wpa}.
After EAPOL logic was moved to eapol.c a check was added to
ap_associate_sta_cb to bitwise compare the AP's RSNE to the RSNE
received in the (Re)Association frame. There is as far as I know no
reason for them to be the same (although they are in our autotest) and
if there was a reason we'd rather validate the (Re)Association RSNE
immediately when received. We also must set different RSNEs as the
"own" (supplicant) and "ap" RSNEs in the handshake_state for validation
of step 2/4 in eapol.c (fixes wpa_supplicant's and MS Windows
connections being rejected)
Make sure we interrupt eapol traffic (4-way handshake) if we receive a
Disassociation from station. Actually do this in ap_del_station because
it's called from both ap_disassoc_cb and ap_success_assoc_resp_cb and
seems to make sense in both cases.
On one hand when we're called with HANDSHAKE_EVENT_FAILED or
HANDSHAKE_EVENT_SETTING_KEYS_FAILED the eapol_sm will be freed in
eapol.c, fix a double-free by setting it to NULL before ap_free_sta
is called.
On the other hand make sure we call eapol_sm_free before setting
sta->sm to NULL in ap_drop_rsna to avoid potential leak and avoid
the eapol_sm continuing to use the handshake_state we freed.
There was somewhat overlapping functionality in the device_watch
infrastructure as well as the netdev_event_watch. This commit combines
the two into a single watch based on the netdev object and cleans up the
various interface additions / removals.
With this commit the interfaces are created when the netdev/device is
switched to Powered=True state AND when the netdev iftype is also in the
correct state for that interface. If the device is brought down, then
all interfaces except the .Device interface are removed.
This will make it easy to implement Device.Mode property properly since
most nl80211 devices need to be brought into Powered=False state prior
to switching the iftype.
This removes the authenticator bit in eapol_sm as well as unifies
eapol_register_authenticator and eapol_register. Taking advantage
of the handshake state authenticator bit we no longer have a need
for 2 separate register functions.
ap, and adhoc were also updated to set the authenticator bit in
the handshake and only use eapol_register to register their sm's.
netdev was updated to use the authenticator bit when choosing the
correct key address for adhoc.
If the sm object (or the handshake object) is NULL, don't call the
corresponding function.
0 0x7fb6cd37da80 in /lib64/libc.so.6
1 0x414764 in eapol_sm_destroy() at eapol.c:673
2 0x42e402 in ap_sta_free() at ap.c:97
3 0x439dbe in l_queue_clear() at /home/parallels/wrk/iwd/ell/queue.c:109
4 0x439e09 in l_queue_destroy() at /home/parallels/wrk/iwd/ell/queue.c:83
5 0x42e4bf in ap_reset() at ap.c:132
6 0x42e519 in ap_free() at ap.c:147
7 0x447456 in interface_instance_free() at /home/parallels/wrk/iwd/ell/dbus-service.c:513
8 0x449be0 in _dbus_object_tree_remove_interface() at /home/parallels/wrk/iwd/ell/dbus-service.c:1595
9 0x449ced in _dbus_object_tree_object_destroy() at /home/parallels/wrk/iwd/ell/dbus-service.c:787
10 0x40fb8c in device_free() at device.c:2717
11 0x405cdb in netdev_free() at netdev.c:605
12 0x439dbe in l_queue_clear() at /home/parallels/wrk/iwd/ell/queue.c:109
13 0x439e09 in l_queue_destroy() at /home/parallels/wrk/iwd/ell/queue.c:83
14 0x40aac2 in netdev_shutdown() at netdev.c:4483
15 0x403b75 in iwd_shutdown() at main.c:80
16 0x43d9f3 in signal_callback() at /home/parallels/wrk/iwd/ell/signal.c:83
17 0x43d4ee in l_main_iterate() at /home/parallels/wrk/iwd/ell/main.c:376
18 0x43d5ac in l_main_run() at /home/parallels/wrk/iwd/ell/main.c:419
19 0x40379b in main() at main.c:454
20 0x7fb6cd36788a in /lib64/libc.so.6
If the device mode it toggled from 'ap' back to 'station' without actually
starting the access point ap_free attempts to zero out the psk, which
causes a crash because it had never been allocated (Start() never was
called). Since ap->psk is actually never used this was removed. Also added
a memset to zero out the pmk on cleanup.
This is the crash observed:
++++++++ backtrace ++++++++
0 0x7f6ffe978a80 in /lib64/libc.so.6
1 0x7f6ffe9d6766 in /lib64/libc.so.6
2 0x42dd51 in memset() at /usr/include/bits/string3.h:90
3 0x42ddd9 in ap_free() at src/ap.c:144
4 0x445ec6 in interface_instance_free() at ell/dbus-service.c:513
5 0x448650 in _dbus_object_tree_remove_interface() at ell/dbus-service.c:1595
6 0x40d980 in device_set_mode_sta() at src/device.c:2113
7 0x447d4c in properties_set() at ell/dbus-service.c:1861
8 0x448a33 in _dbus_object_tree_dispatch() at ell/dbus-service.c:1691
9 0x442587 in message_read_handler() at ell/dbus.c:285
10 0x43cac9 in io_callback() at ell/io.c:123
11 0x43bf5e in l_main_iterate() at ell/main.c:376
12 0x43c01c in l_main_run() at ell/main.c:419
13 0x40379d in main() at src/main.c:460
14 0x7f6ffe96288a in /lib64/libc.so.6
+++++++++++++++++++++++++++
Rather than have device.c manage the creation/removal of
AP/AdHoc interfaces this new event was introduced. Now
anyone can listen for device events and if the mode changes
handle accordingly. This fixes potential memory leaks
in WSC when switching modes as well.
