Hans de Goede [Mon, 29 Aug 2022 15:28:37 +0000 (17:28 +0200)]
hwdb: Fix Acer Aspire One AOD270/Packard Bell Dot keymappings
The Acer Aspire One AOD270 and the same hardware rebranded as
Packard Bell Dot SC need a couple of keymap fixups:
1. The switch-video-mode key does not do anything. Standard acer-wmi
maps scancode 0x61 to KEY_IGNORE since typically these events are
duplicate with the ACPI video bus. But on these models the ACPI video
bus does not send events for this key, so map it.
2. The Brightness up / down hotkeys send atkbd scancode 0xce / 0xef
which by default are mapped to KEY_KPPLUSMINUS and KEY_MACRO.
These actually are duplicate events with the ACPI video bus,
so map these to KEY_IGNORE.
udev-watch: remove symlink for saving inotify watch handle only when it is owned by the processing device
Before removing symlinks that stores watch handles, this makes udev
worker check if the symlink is owned by the processing device.
Then, we can avoid TOCTOU and drop the try-and-wait loop.
test: make the resolved notifications check a bit more robust
Let's parse the resolved JSON notifications via `jq` and check them in a
bit more "controlled" manner - e.g. until now the `grep` was checking just
a one gigantic JSON string, as all received notifications via the
varlink socket are terminated by a NUL character, not a newline.
Also, as the notification delivery is asynchronous, retry the check
a couple of times if it fails (spotted in C8S jobs):
We support PCR measurements for both classic TPM1.2 and TPM2, hence just
say "TPM" generically in that context. But the signed policies are
exclusive to TPM2, hence always say TPM2 there.
We mostly got that right, except at one place. Fix that.
tmpfiles: copy PCR sig/pkey from initrd /.extra/ into /run/
Now that sd-stub will place the PCR signature and its public key in
the initrd's /.extra/ directory, let's copy it from there into /run/
from userspace. This is done because /.extra/ is on the initrd's tmpfs
which will be emptied during the initrd → host transition. Since we want
these two files to survive we'll copy them – if they exist – into /run/
where they will survive the transition.
Thus, with this last change the files will have safely propagated from
their PE sections into files in /run/ where userspace can find them
The paths in /run/ happen to be the exact ones that
systemd-cryptenroll/systemd-cryptsetup/systemd-creds look for them.
stub: pass .pcrsig and .pcrpkey PE sections as cpio into invoked kernel
Pick up the two new sections in sd-stub and pass them as initrds into
the booted kernels, where they'll show up as
/.extra/tpm2-pcr-signature.json and /.extra/tpm2-pcr-public-key.pem in
the initrd file system.
The initrd is then supposed to pick these files up from there and save
them at a place that will survive into the host OS.
stub: add new special PE sections ".pcrsig" and ".pcrpkey" in unified kernels
These aren't wired up yet to do anything useful. For now we just define
them.
This sections are supposed to carry a signature for expected
measurements on PCR 11 if this kernel is booted, in the JSON format
"systemd-measure sign" generates, and the public key used for the
signature.
The idea is to embedd the signature and the public key in unified
kernels and making them available to userspace, so that userspace can
easily access them and enroll (for which the public key is needed) or
unlock (for which the PCR signature is needed) LUKS2 volumes and
credentials that are bound to the currently used kernel version stream.
Why put these files in PE sections rather than just into simple files in
the initrd or into the host fs?
The signature cannot be in the initrd, since it is after all covering
the initrd, and thus the initrd as input for the calculation cannot
carry the result of the calculation. Putting the signature onto the root
fs sucks too, since we typically want to unlock the root fs with it,
hence it would be inaccessible for it's primary purpose then.
The public key could be in the initrd or in the root fs, there's no
technical restriction for that. However, I still think it's a good idea
to put it in a PE section as well, because this means the piece of code
that attaches the signature can also attach the public key easily in one
step, which is nice since it allows separating the roles of the
kernel/initrd/root fs builder, and the role of the signer, and the
former doesn't have to have knowledge about what the latter is going to
add to the image.
Note that the signature section is excluded from the TPM measurements
sd-stub does about its resource sections, since – as mentioned – it's
the expected output of the signing operation whose input are the
measurements, hence it cannot also be input to them. The public key
section is included in the measurements however.
Implement DNS notifications from resolved via varlink
* The new varlink interface exposes a method to subscribe to DNS
resolutions on the system. The socket permissions are open for owner and
group only.
* Notifications are sent to subscriber(s), if any, after successful
resolution of A and AAAA records.
This feature could be used by applications for auditing/logging services
downstream of the resolver. It could also be used to asynchronously
update the firewall. For example, a system that has a tightly configured
firewall could open up connections selectively to known good hosts based
on a known allow-list of hostnames. Of course, updating the firewall
asynchronously will require other design considerations (such as
queueing packets in the user space while a verdict is made).
See also:
https://lists.freedesktop.org/archives/systemd-devel/2022-August/048202.html
https://lists.freedesktop.org/archives/systemd-devel/2022-February/047441.html
repart: make existing partition can be also 'dropped'
Previously, when an existing partition cannot grow, then entire process
fails. This makes such an existing partion handled as an foreign
partition, i.e. it is not managed by us.
repart: reset assignments by previous context_allocate_partitions()
The function context_allocate_partitions() may be called multiple times.
If this is called multiple times, then dropped partitions may still
assigned to free area.
loop-util: save the flag about if LOOP_CONFIGURE ioctl works or not in loop_configure()
When LOOP_CONFIGURE fail, then it is not necessary to call it on any
later call of loop_configure(). Let's save the flag in a static variable
in the function.
In a couple of recent CI runs I noticed TEST-36 failing due to a missed
service exit notification and a subsequent fail of the `grep` command:
```
[ 257.112153] H systemd[1]: Started numa-test.service.
[ 257.114343] H systemd[899]: numa-test.service: Failed to set NUMA memory policy: Invalid argument
[ 257.118270] H systemd[899]: numa-test.service: Failed at step NUMA_POLICY spawning /bin/sleep: Invalid argument
[ 257.126170] H systemd[1]: Bus private-bus-connection: changing state RUNNING → CLOSING
[ 257.130290] H systemd[1]: numa-test.service: Failed to send unit change signal for numa-test.service: Connection reset by peer
[ 257.131567] H systemd[1]: Received SIGCHLD from PID 899 ((sleep)).
[ 257.132870] H systemd[1]: Got disconnect on private connection.
[ 257.134299] H systemd[1]: systemd-journald.service: Got notification message from PID 498 (FDSTORE=1)
[ 257.135611] H systemd[1]: systemd-journald.service: Added fd 38 (n/a) to fd store.
[ 257.136999] H systemd[1]: systemd-journald.service: Received EPOLLHUP on stored fd 38 (stored), closing.
[ 257.366996] H testsuite-36.sh[536]: + stopJournalctl
[ 257.366996] H testsuite-36.sh[536]: + local unit=init.scope
[ 257.366996] H testsuite-36.sh[536]: + echo 'Force journald to write all queued messages'
[ 257.366996] H testsuite-36.sh[536]: Force journald to write all queued messages
[ 257.366996] H testsuite-36.sh[536]: + journalctl --sync
[ 257.488642] H systemd-journald[498]: Received client request to rotate journal.
[ 257.520821] H testsuite-36.sh[536]: + journalctl -u init.scope --cursor-file=jounalCursorFile
[ 257.981399] H testsuite-36.sh[536]: + pid1StopUnit numa-test.service
[ 257.984533] H testsuite-36.sh[536]: + systemctl stop numa-test.service
[ 258.173656] H systemd[1]: Bus private-bus-connection: changing state AUTHENTICATING → RUNNING
[ 258.180710] H systemd[1]: numa-test.service: Trying to enqueue job numa-test.service/stop/replace
[ 258.182424] H systemd[1]: Added job numa-test.service/stop to transaction.
[ 258.185234] H systemd[1]: numa-test.service: Installed new job numa-test.service/stop as 738
[ 258.187017] H systemd[1]: numa-test.service: Enqueued job numa-test.service/stop as 738
[ 258.239930] H testsuite-36.sh[536]: + grep 'numa-test.service: Main process exited, code=exited, status=242/NUMA' journal.log
```
Let's mitigate this by checking the test service exit status directly
instead of relying on the notification.
tpm2-util: add common parser for the LUKS2 TPM2 JSON structure
This splits out the JSON parser used by the systemd-cryptsetup code.
This is preparation for later work to reuse it in the tpm2 cryptsetup
token module, which currently uses a separate but very similar parser
for the same data.
tpm2-util: extend TPM2 policies to optionally check PCR values against signed values
Traditionally, TPM2 PCR policies are bound against literal PCR values,
which makes them hard to work with when updating software that is
measured into PCRs: each update will change the PCR values, and thus
break TPM2 policies of existing objects.
Let's improve the situation: let's allow signed PCR policies. Secrets
and other TPM2 objects can be associated with a public key that signs a
PCR policy. Thus, if the signed policy and the public key is presented,
access to the TPM2 object can be granted. This allows a less brittle
handling of updates: for example, whenever a kernel image is updated a
new signed PCR policy can be shipped along with it, signed by a private
key owned by the kernel vendor (ideally: same private key that is used
to sign the kernel image itself). TPM2 objects can then be bound to the
associated public key, thus allowing objects that can only be unlocked
by kernels of the same vendor. This makes it very easy to update kernels
without affecting locked secrets.
This does not hook up any of the consuming code (just passes NULL/0
everywhere). This is for later commits.
bootctl: don't start "bootctl list" output with a title line
Let's not output a title line given that we don't output multiple
different things here anyway, and the "bootctl list" command is about
listing boot entries anyway and it's documented that way.
Having titles for sections if we have mutliple sections of output
definitely makes sense, but if there's only one kind of information we
list it's redundant clutter.
Let's better be safe than sorry, and follow symlinks in ESP + XBOOTLDR
via chase_symlinks() relative to the root of these files systems. This is
not a big issue given that ESP/XBOOTLDR are supposed to be VFAT where
symlinks don't exist, but the specs don't strictly require this, and by
loading efifs drivers in uefi it would be possible to support symlinks,
but we'd rather not have that here.
No real change in behaviour, just stricter rules to make me sleep better
at night.
William Roberts [Wed, 7 Sep 2022 12:52:16 +0000 (07:52 -0500)]
tpm2: add bind key
Currently, the tpm2 support will use encrypted sessions by creating a
primary key that is used to encrypt traffic. This creates a problem as
the key created for encrypting the traffic could be faked by an active
interposer on the bus. In cases when a pin is used, we can introduce the
bind key. The pin is used as the auth value for the seal key, aka the
disk encryption key, and that auth value can be used in the session
establishment. An attacker would need the pin value to create the secure
session and thus an active interposer without the pin could not
interpose on TPM traffic.
Related-to: #22637 Signed-off-by: William Roberts <william.c.roberts@intel.com>
projects / thirdparty / systemd.git / log
