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
If an event is in response to some command which is returning an
unexpected value (unexpected with respect to wpas.py) handle_eow
would raise an exception.
Specifically with DPP this was being hit when the URI was being
returned.
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.
This was caught by static analysis. As is common this should never
happen in the real world since the only way this can fail (apart from
extreme circumstances like OOM) is if the key size is incorrect, which
it will never be.
Static analysis flagged that 'path' was never being checked (which
should not ever be NULL) but during that review I noticed stat()
was being called, then fstat afterwards.
Adds a new wait argument which, if false, will call the DBus method
and return immediately. This allows the caller to create multiple
radios very quickly, simulating (as close as we can) a wifi card
with dual phy's which appear in the kernel simultaneously.
The name argument was also changed to be mandatory, which is now
required by hwsim.
Currently CreateRadio only allows a single outstanding DBus message
until the radio is fully created. 99% of the time this is just fine
but in order to test dual phy cards there needs to be support for
phy's appearing at the same time.
This required storing the pending DBus message inside the radio object
rather than a single static variable.
The code was refactored to handle the internal radio info objects better
for the various cases:
- Creation from CreateRadio()
- Radio already existed before hwsim started, or created externally
- Existing radio changed name, address, etc.
First, Name is now a required option to CreateRadio(). This allows
the radio info to be pushed to the queue immediately (also allowing the
pending DBus message to be tracked). Then, when the NEW_RADIO event
fires the pending radio can be looked up (by name) and filled with the
remaining info.
If the radio was not found by name but a matching ID was found this is
the 'changed' case and the radio is re-initialized with the changed
values.
If neither name or ID matches the radio was created externally, or
prior to hwsim starting. A radio info object is created at this time
and initialized.
The ID was changed to a signed integer in order to initialize it to an
invalid number -1. Doing this was required since a pending uninitalized
radio ID (0) could match an existing radio ID. This required some
bounds checks in case the kernels counter reaches an extremely high value.
This isn't likely to ever happen in practice.
This tool will decrypt an IWD network profile which was previously
encrypted using a systemd provided key. Either a text passphrase
can be provided (--pass) or a file containing the secret (--file).
This can be useful for debugging, or recovering an encrypted
profile after enabling SystemdEncrypt.
Recently systemd added the ability to pass secret credentials to
services via LoadCredentialEncrypted/SetCredentialEncrypted. Once
set up the service is able to read the decrypted credentials from
a file. The file path is found in the environment variable
CREDENTIALS_DIRECTORY + an identifier. The value of SystemdEncrypt
should be set to the systemd key ID used when the credential was
created.
When SystemdEncrypt is set IWD will attempt to read the decrypted
secret from systemd. If at any point this fails warnings will be
printed but IWD will continue normally. Its expected that any failures
will result in the inability to connect to any networks which have
previously encrypted the passphrase/PSK without re-entering
the passphrase manually. This could happen, for example, if the
systemd secret was changed.
Once the secret is read in it is set into storage to be used for
profile encryption/decryption.
Using storage_decrypt() hotspot can also support profile encyption.
The hotspot consortium name is used as the 'ssid' since this stays
consistent between hotspot networks for any profile.
Some users don't like the idea of storing network credentials in
plaintext on the file system. This patch implements an option to
encrypt such profiles using a secret key. The origin of the key can in
theory be anything, but would typically be provided by systemd via
'LoadEncryptedCredential' setting in the iwd unit file.
The encryption operates on the entire [Security] group as well as all
embedded groups. Once encrypted the [Security] group will be replaced
with two key/values:
EncryptedSalt - A random string of bytes used for the encryption
EncryptedSecurity - A string of bytes containing the encrypted
[Security] group, as well as all embedded groups.
After the profile has been encrypted these values should not be
modified. Note that any values added to [Security] after encryption
has no effect. Once the profile is encrypted there is no way to modify
[Security] without manually decrypting first, or just re-creating it
entirely which effectively treated a 'new' profile.
The encryption/decryption is done using AES-SIV with a salt value and
the network SSID as the IV.
Once a key is set any profiles opened will automatically be encrypted
and re-written to disk. Modules using network_storage_open will be
provided the decrypted profile, and will be unaware it was ever
encrypted in the first place. Similarly when network_storage_sync is
called the profile will by automatically encrypted and written to disk
without the caller needing to do anything special.
A few private storage.c helpers were added to serve several purposes:
storage_init/exit():
This sets/cleans up the encryption key direct from systemd then uses
extract and expand to create a new fixed length key to perform
encryption/decryption.
__storage_decrypt():
Low level API to decrypt an l_settings object using a previously set
key and the SSID/name for the network. This returns a 'changed' out
parameter signifying that the settings need to be encrypted and
re-written to disk. The purpose of exposing this is for a standalone
decryption tool which does not re-write any settings.
storage_decrypt():
Wrapper around __storage_decrypt() that handles re-writing a new
profile to disk. This was exposed in order to support hotspot profiles.
__storage_encrypt():
Encrypts an l_settings object and returns the full profile as data
This got merged without a few additional fixes, in particular an
over 80 character line and incorrect length check.
Fixes: d8116e8828 ("dpp-util: add dpp_point_from_asn1()")
When we detect a new phy being added, we schedule a filtered dump of
the newly detected WIPHY and associated INTERFACEs. This code path and
related processing of the dumps was mostly shared with the un-filtered
dump of all WIPHYs and INTERFACEs which is performed when iwd starts.
This normally worked fine as long as a single WIPHY was created at a
time. However, if multiphy new phys were detected in a short amount of
time, the logic would get confused and try to process phys that have not
been probed yet. This resulted in iwd trying to create devices or not
detecting devices properly.
Fix this by only processing the target WIPHY and related INTERFACEs
when the filtered dump is performed, and not any additional ones that
might still be pending.
While here, remove a misleading comment:
manager_wiphy_check_setup_done() would succeed only if iwd decided to
keep the default interfaces created by the kernel.
This simulates the conditions that trigger a free-after-use which was
fixed with:
2c355db7 ("scan: remove periodic scans from queue on abort")
This behavior can be reproduced reliably using this test with the above
patch reverted.
This debug print was before any checks which could bail out prior to
autoconnect starting. This was confusing because debug logs would
contain multiple "station_autoconnect_start()" prints making you think
autoconnect was started several times.
The periodic scan code was refactored to make normal scans and
periodic scans consistent by keeping both in the same queue. But
that change left out the abort path where periodic scans were not
actually removed from the queue.
This fixes a rare crash when a periodic scan has been triggered and
the device goes down. This path never removes the request from the
queue but still frees it. Then when the scan context is removed the
stale request is freed again.
0 0x4bb65b in scan_request_cancel src/scan.c:202
1 0x64313c in l_queue_clear ell/queue.c:107
2 0x643348 in l_queue_destroy ell/queue.c:82
3 0x4bbfb7 in scan_context_free src/scan.c:209
4 0x4c9a78 in scan_wdev_remove src/scan.c:2115
5 0x42fecd in netdev_free src/netdev.c:965
6 0x445827 in netdev_destroy src/netdev.c:6507
7 0x52beb9 in manager_config_notify src/manager.c:765
8 0x67084b in process_multicast ell/genl.c:1029
9 0x67084b in received_data ell/genl.c:1096
10 0x65e790 in io_callback ell/io.c:120
11 0x65aaae in l_main_iterate ell/main.c:478
12 0x65b213 in l_main_run ell/main.c:525
13 0x65b213 in l_main_run ell/main.c:507
14 0x65b72c in l_main_run_with_signal ell/main.c:647
15 0x4124e7 in main src/main.c:532
If netdev_connect_failed is called before netdev_get_oci_cb() the
netdev's handshake will be destroyed and ultimately crash when the
callback is called.
This patch moves the cancelation into netdev_connect_free rather than
netdev_free.
++++++++ backtrace ++++++++
0 0x7f4e1787d320 in /lib64/libc.so.6
1 0x42634c in handshake_state_set_chandef() at src/handshake.c:1057
2 0x40a11b in netdev_get_oci_cb() at src/netdev.c:2387
3 0x483d7b in process_unicast() at ell/genl.c:986
4 0x480d3c in io_callback() at ell/io.c:120
5 0x48004d in l_main_iterate() at ell/main.c:472 (discriminator 2)
6 0x4800fc in l_main_run() at ell/main.c:521
7 0x48032c in l_main_run_with_signal() at ell/main.c:649
8 0x403e95 in main() at src/main.c:532
9 0x7f4e17867b75 in /lib64/libc.so.6
+++++++++++++++++++++++++++
Commit 4d2176df29 ("handshake: Allow event handler to free handshake")
introduced a re-entrancy guard so that handshake_state objects that are
destroyed as a result of the event do not cause a crash. It rightly
used a temporary object to store the passed in handshake. Unfortunately
this caused variable shadowing which resulted in crashes fixed by commit
d22b174a73 ("handshake: use _hs directly in handshake_event").
However, since the temporary was no longer used, this fix itself caused
a crash:
#0 0x00005555f0ba8b3d in eapol_handle_ptk_1_of_4 (sm=sm@entry=0x5555f2b4a920, ek=0x5555f2b62588, ek@entry=0x16, unencrypted=unencrypted@entry=false) at src/eapol.c:1236
1236 handshake_event(sm->handshake,
(gdb) bt
#0 0x00005555f0ba8b3d in eapol_handle_ptk_1_of_4 (sm=sm@entry=0x5555f2b4a920, ek=0x5555f2b62588, ek@entry=0x16, unencrypted=unencrypted@entry=false) at src/eapol.c:1236
#1 0x00005555f0bab118 in eapol_key_handle (unencrypted=<optimized out>, frame=<optimized out>, sm=0x5555f2b4a920) at src/eapol.c:2343
#2 eapol_rx_packet (proto=<optimized out>, from=<optimized out>, frame=<optimized out>, unencrypted=<optimized out>, user_data=0x5555f2b4a920) at src/eapol.c:2665
#3 0x00005555f0bac497 in __eapol_rx_packet (ifindex=62, src=src@entry=0x5555f2b62574 "x\212 J\207\267", proto=proto@entry=34958, frame=frame@entry=0x5555f2b62588 "\002\003",
len=len@entry=121, noencrypt=noencrypt@entry=false) at src/eapol.c:3017
#4 0x00005555f0b8c617 in netdev_control_port_frame_event (netdev=0x5555f2b64450, msg=0x5555f2b62588) at src/netdev.c:5574
#5 netdev_unicast_notify (msg=msg@entry=0x5555f2b619a0, user_data=<optimized out>) at src/netdev.c:5613
#6 0x00007f60084c9a51 in dispatch_unicast_watches (msg=0x5555f2b619a0, id=<optimized out>, genl=0x5555f2b3fc80) at ell/genl.c:954
#7 process_unicast (nlmsg=0x7fff61abeac0, genl=0x5555f2b3fc80) at ell/genl.c:973
#8 received_data (io=<optimized out>, user_data=0x5555f2b3fc80) at ell/genl.c:1098
#9 0x00007f60084c61bd in io_callback (fd=<optimized out>, events=1, user_data=0x5555f2b3fd20) at ell/io.c:120
#10 0x00007f60084c536d in l_main_iterate (timeout=<optimized out>) at ell/main.c:478
#11 0x00007f60084c543e in l_main_run () at ell/main.c:525
#12 l_main_run () at ell/main.c:507
#13 0x00007f60084c5670 in l_main_run_with_signal (callback=callback@entry=0x5555f0b89150 <signal_handler>, user_data=user_data@entry=0x0) at ell/main.c:647
#14 0x00005555f0b886a4 in main (argc=<optimized out>, argv=<optimized out>) at src/main.c:532
This happens when the driver does not support rekeying, which causes iwd to
attempt a disconnect and re-connect. The disconnect action is
taken during the event callback and destroys the underlying eapol state
machine. Since a temporary isn't used, attempting to dereference
sm->handshake results in a crash.
Fix this by introducing a UNIQUE_ID macro which should prevent shadowing
and using a temporary variable as originally intended.
Fixes: d22b174a73 ("handshake: use _hs directly in handshake_event")
Fixes: 4d2176df29 ("handshake: Allow event handler to free handshake")
Reported-By: Toke Høiland-Jørgensen <toke@toke.dk>
Tested-by: Toke Høiland-Jørgensen <toke@toke.dk>
There is no need to punch the holes for netdev/wheel groups to send to
the .Agent interface. This is only done by the iwd daemon itself and
the policy for user 'root' already takes care of this.
A select few drivers send this instead of SIGNAL_MBM. The docs say this
value is the signal 'in unspecified units, scaled to 0..100'. The range
for SIGNAL_MBM is -10000..0 so this can be scaled to the MBM range easy
enough...
Now, this isn't exactly correct because this value ultimately gets
returned from GetOrderedNetworks() and is documented as 100 * dBm where
in reality its just a unit-less signal strength value. Its not ideal, but
this patch at least will fix BSS ranking for these few drivers.
The 'at_console' D-Bus policy setting has been deprecated for more then
10 years and could be ignored at any time in the future. Moreover, while
the intend was to allow locally logged on users to interact with iwd, it
didn't actually do that.
More info at https://www.spinics.net/lists/linux-bluetooth/msg75267.html
and https://gitlab.freedesktop.org/dbus/dbus/-/issues/52
Therefor remove the 'at_console' setting block.
On Debian (based) systems, there is a standard defined group which is
allowed to manage network interfaces, and that is the 'netdev' group.
So add a D-Bus setting block to grant the 'netdev' group that access.
Building on GCC 8 resulted in this compiler error.
src/sae.c:107:25: error: implicit declaration of function 'reallocarray';
did you mean 'realloc'? [-Werror=implicit-function-declaration]
sm->rejected_groups = reallocarray(NULL, 2, sizeof(uint16_t));
src/erp.c:134:10: error: comparison of integer expressions of different
signedness: 'unsigned int' and 'int' [-Werror=sign-compare]
src/eap-ttls.c:378:10: error: comparison of integer expressions of different signedness: 'uint32_t' {aka 'unsigned int'} and 'int' [-Werror=sign-compare]
Fixes the following crash:
#0 0x000211c4 in netdev_connect_event (msg=<optimized out>, netdev=0x2016940) at src/netdev.c:2915
#1 0x76f11220 in process_multicast (nlmsg=0x7e8acafc, group=<optimized out>, genl=<optimized out>) at ell/genl.c:1029
#2 received_data (io=<optimized out>, user_data=<optimized out>) at ell/genl.c:1096
#3 0x76f0da08 in io_callback (fd=<optimized out>, events=1, user_data=0x200a560) at ell/io.c:120
#4 0x76f0ca78 in l_main_iterate (timeout=<optimized out>) at ell/main.c:478
#5 0x76f0cb74 in l_main_run () at ell/main.c:525
#6 l_main_run () at ell/main.c:507
#7 0x76f0cdd4 in l_main_run_with_signal (callback=callback@entry=0x18c94 <signal_handler>, user_data=user_data@entry=0x0)
at ell/main.c:647
#8 0x00018178 in main (argc=<optimized out>, argv=<optimized out>) at src/main.c:532
This crash was introduced in commit:
4d2176df29 ("handshake: Allow event handler to free handshake")
The culprit seems to be that 'hs' is being used both in the caller and
in the macro. Since the macro defines a variable 'hs' in local block
scope, it overrides 'hs' from function scope. Yet (_hs) still evaluates
to 'hs' leading the local variable to be initialized with itself. Only
the 'handshake_event(hs, HANDSHAKE_EVENT_SETTING_KEYS))' is affected
since it is the only macro invocation that uses 'hs' from function
scope. Thus, the crash would only happen on hardware supporting handshake
offload (brcmfmac).
Fix this by removing the local scope variable declaration and evaluate
(_hs) instead.
Fixes: 4d2176df29 ("handshake: Allow event handler to free handshake")
- Ensure that input isn't an empty string
- Ensure that EINVAL errno (which could be optionally returned by
strto{ul|l} is also checked.
- Since strtoul allows '+' and '-' characters in input, ensure that
input which is expected to be an unsigned number doesn't start with
'-'
