Static analysis complains that 'last' could be NULL which is true.
This really could only happen if every frequency was disabled which
likely is impossible but in any case, check before dereferencing
the pointer.
Since these are all stack variables they are not zero initialized.
If parsing fails there may be invalid pointers within the structures
which can get dereferenced by p2p_clear_*
The input queue pointer was being initialized unconditionally so if
parsing fails the out pointer is still set after the queue is
destroyed. This causes a crash during cleanup.
Instead use a temporary pointer while parsing and only after parsing
has finished do we set the out pointer.
Reported-By: Alex Radocea <alex@supernetworks.org>
When HUP is received the IO read callback was never completing which
caused it to block indefinitely until waited for. This didn't matter
for most transient processes but for IWD, hostapd, wpa_supplicant
it would cause test-runner to hang if the process crashed.
Detecting a crash is somewhat hacky because we have no process
management like systemd and the return code isn't reliable as some
processes return non-zero under normal circumstances. So to detect
a crash the process output is being checked for the string:
"++++++++ backtrace ++++++++". This isn't 100% reliable obviously
since its dependent on how the binary is compiled, but even if the
crash itself isn't detected any test should still fail if written
correctly.
Doing this allows auto-tests to handle IWD crashes gracefully by
failing the test, printing the exception (event without debugging)
and continue with other tests.
The slaac_test was one that would occationally fail, but very rarely,
due to the resolvconf log values appearing in an unexpected order.
This appears to be related to a typo in netconfig-commit which would
not set netconfig-domains and instead set dns_list. This was fixed
with a pending patch:
https://lore.kernel.org/iwd/20240227204242.1509980-1-denkenz@gmail.com/T/#u
But applying this now leads to testNetconfig failing slaac_test
100% of the time.
I'm not familiar enough with resolveconf to know if this test change
is ok, but based on the test behavior the expected log and disk logs
are the same, just in the incorrect order. I'm not sure if this the
log order is deterministic so instead the check now iterates the
expected log and verifies each value appears once in the resolvconf
log.
Here is an example of the expected vs disk logs after running the
test:
Expected:
-a wlan1.dns
nameserver 192.168.1.2
nameserver 3ffe:501:ffff💯:10
nameserver 3ffe:501:ffff💯:50
-a wlan1.domain
search test1
search test2
Resolvconf log:
-a wlan1.domain
search test1
search test2
-a wlan1.dns
nameserver 192.168.1.2
nameserver 3ffe:501:ffff💯:10
nameserver 3ffe:501:ffff💯:50
static analysis complains that authenticator is used uninitialized.
This isn't strictly true as memory region is reserved for the
authenticator using the contents of the passed in structure. This
region is then overwritten once the authenticator is actually computed
by authenticator_put(). Silence this warning by explicitly setting
authenticator bytes to 0.
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
This shouldn't be possible in theory since the roam_bss_list being
iterated is a subset of entire scan_bss list station/network has
but to be safe, and catch any issues due to future changes warn on
this condition.
For some encrypt operations DPP passes no AD iovecs (both are
NULL/0). But since the iovec itself is on the stack 'ad' is a
valid pointer from within aes_siv_encrypt. This causes memcpy
to be called which coverity complains about. Since the copy
length is zero it was effectively a no-op, but check num_ad to
prevent the call.
Tests the 3 possible options to UseDefaultEccGroup behave as
expected:
- When not provided use the "auto" behavior.
- When false, always use higher order groups
- When true, always use default group
The SAE test made some assumptions on certain conditions due to
there being no way of checking if those conditions were met
Mainly the use of H2E/hunt-and-peck.
We assumed that when we told hostapd to use H2E or hunt/peck it
would but in reality it was not. Hostapd is apparently not very
good at swapping between the two with a simple "reload" command.
Once H2E is enabled it appears that it cannot be undone.
Similarly the vendor elements seem to carry over from test to
test, and sometimes not which causes unintended behavior.
To fix this create separate APs for the specific scenario being
tested:
- Hunt and peck
- H2E
- Special vendor_element simulating buggy APs
Another issue found was that if password identifies are used
hostapd automatically chooses H2E which was not intented, at
least based on the test names (in reality it wasn't causing any
problems).
The tests have also been improved to use hostapds "sta_status"
command which contains the group number used when authenticating,
so now that at least can be verified.
In order to complete the learned default group behavior station needs
to be aware of when an SAE/OWE connection retried. This is all
handled within netdev/sae so add a new netdev event so station can
set the appropriate network flags to prevent trying the non-default
group again.
If either the settings specify it, or the scan_bss is flagged, set
the use_default_ecc_group flag in the handshake.
This also renames the flag to cover both OWE and SAE
There is special handling for buggy OWE APs which set a network flag
to use the default OWE group. Utilize the more persistent setting
within known-networks as well as the network object (in case there
is no profile).
This also renames the get/set APIs to be generic to ECC groups rather
than only OWE.
This adds the option [Settings].UseDefaultEccGroup which allows a
network profile to specify the behavior when using an ECC-based
protocol. If unset (default) IWD will learn the behavior of the
network for the lifetime of its process.
Many APs do not support group 20 which IWD tries first by default.
This leads to an initial failure followed by a retry using group 19.
This option will allow the user to configure IWD to use group 19
first or learn the network capabilities, if the authentication fails
with group 20 IWD will always use group 19 for the process lifetime.
The information specific to auth/assoc/connect timeouts isn't
communicated to station so emit the notice events within netdev.
We could communicate this to station by adding separate netdev
events, but this does not seem worth it for this use case as
these notice events aren't strictly limited to station.
For anyone debugging or trying to identify network infrastructure
problems the IWD DBus API isn't all that useful and ultimately
requires going through debug logs to figure out exactly what
happened. Having a concise set of debug logs containing only
relavent information would be very useful. In addition, having
some kind of syntax for these logs to be parsed by tooling could
automate these tasks.
This is being done, starting with station, by using iwd_notice
which internally uses l_notice. The use of the notice log level
(5) in IWD will be strictly for the type of messages described
above.
iwd_notice is being added so modules can communicate internal
state or event information via the NOTICE log level. This log
level will be reserved in IWD for only these type of messages.
The iwd_notice macro aims to help enforce some formatting
requirements for these type of log messages. The messages
should be one or more comma-separated "key: value" pairs starting
with "event: <name>" and followed by any additional info that
pertains to that event.
iwd_notice only enforces the initial event key/value format and
additional arguments are left to the caller to be formatted
correctly.
The --logger,-l flag can now be used to specify the logger type.
Unset (default) will set log output to stderr as it is today. The
other valid options are "syslog" and "journal".
basename use is considered harmful. There are two versions of
basename (see man 3 basename for details). The more intuitive version,
which is currently being used inside wiphy.c, is not supported by musl
libc implementation. Use of the libgen version is not preferred, so
drop use of basename entirely. Since wiphy.c is the only call site of
basename() inside iwd, open code the required logic.
ELL now has a setting to limit the number of DHCP attempts. This
will now be set in IWD and if reached will result in a failure
event, and in turn a disconnect.
IWD will set a maximum of 4 retries which should keep the maximum
DHCP time to ~60 seconds roughly.
The known frequency list is now a sorted list and the roam scan
results were not complying with this new requirement. The fix is
easy though since the iteration order of the scan results does
not matter (the roam candidates are inserted by rank). To fix
the known frequencies order we can simply reverse the scan results
list before iterating it.
When operating as an AP, drop message 4 of the 4-way handshake if the AP
has not yet received message 2. Otherwise an attacker can skip message 2
and immediately send message 4 to bypass authentication (the AP would be
using an all-zero ptk to verify the authenticity of message 4).
Modify the existing frequency test to check that the ordering
lines up with the ranking of the BSS.
Add a test to check that quick scans limit the number of known
frequencies.
In very large network deployments there could be a vast amount of APs
which could create a large known frequency list after some time once
all the APs are seen in scan results. This then increases the quick
scan time significantly, in the very worst case (but unlikely) just
as long as a full scan.
To help with this support in knownnetworks was added to limit the
number of frequencies per network. Station will now only get 5
recent frequencies per network making the maximum frequencies 25
in the worst case (~2.5s scan).
The magic values are now defines, and the recent roam frequencies
was also changed to use this define as well.
James Prestwood