The new unit is nice, but it might not be appropriate in all scenarios. It
requires a new kernel, which might be known to not be available, and also
changes sysctl kernel.core_pattern at runtime, which might not be desired.
Replace static enablement by a normal [Install] section and add the unit
to presets to enable it by default.
The awkward instructions in the man page are simplified and adjusted.
This adds an initial TPM2 implementation of the io.systemd.Report.Signer
interface, which returns a set of signed TPM attestations that also
includes the supplied report digest.
The returned report consists of multiple components:
- A signed PCR quote generated with TPM2_Quote.
- Signed NvPCR attestations generated with TPM2_NV_Certify.
- A signed audit session attestation generated with
TPM2_GetSessionAuditDigest.
Each signed report component includes the JSON encoded TPMS_ATTEST
attestation structure and corresponding signature, in both PEM encoded
form and as a JSON encoded TPMT_SIGNATURE structure.
NvPCR report components also include the readable name of the NvPCR, the
NV index public area as the JSON encoded TPMS_NV_PUBLIC structure, and some
additional authenticated data that is digested and supplied as the
qualifying data to the TPM2_NV_Certify command. This authenticated data
includes the NvPCR name and priority.
The report digest that is supplied via varlink is supplied as the
qualifying data to the audit session attestation.
The returned report also includes the event log which is retrieved from
pcrlock's varlink interface, and the public area of the signing key in
both PEM encoded form and as a JSON encoded TPMT_PUBLIC structure.
The audit session attestation is always the last component. The
preceding components are all executed with the audit session, and the
signer requires the audit session to remain exclusive whilst generating
the report. What this does is provide evidence to a verifier that the
overall report is a single, consistent snapshot of the system (ie, no
other TPM commands executed whilst generating the report) because the
audit session attestation contains a field that indicates that the
session was exclusive at the time it was attested.
The set of attested PCRs and NvPCRs are currently hardcoded. It includes
all firmware PCRs with the exception of PCR6, and all other PCRs with
the exception of the IMA one (which isn't useful on its own without the
IMA log). All defined NvPCRs are included.
A verifier can verify the signed attestation components individually by
verifying their signatures against the supplied attestation data, using
the supplied public key.
For the PCR report component, a verifier can replay the measurements in
the log in order to reconstruct the PCR values, and then use this and
the PCR selection from the attestation in order to calculate the PCR
digest, and then check that this matches the one in the attestation.
For the NvPCR report components, a verifier checks that the NV index
name in the attestation matches one that is anchored in PCR9 to be sure
that the attestation is for a valid NvPCR. A verifier can then replay
the measurements in the log to ensure that the resulting NvPCR value
matches the one supplied in the attestation. The authenticated data is a
JSON blob containing the NvPCR name and priority. A verifier can digest
this and ensure it matches the qualifying data in the attestation.
The audit session attestation includes the audit session digest and
whether the audit session was still exclusive when the attestation was
generated. A verifier should confirm exclusivity. The digest includes a
record of all TPM commands executed with the audit session, as each
command results in it being extended with the command parameter hash and
the result parameter hash. A verifier should replay the preceding report
components to compute an expected audit digest and make sure that this
digest matches the one in the attestation in order to be sure that the
overall report represents a single, consistent snapshot. The other
report components provide sufficient information for a verifier to
reconstruct the cpHash and rpHash.
When reconstructing the cpHash for the PCR and NvPCR components, the
signing scheme is the NULL scheme (they use the attestation key's
signing scheme). The required signing key public area is supplied in
the report. The supplied qualifying data is in the extra data field of
the attestation.
The PCR selection is also required to reconstruct the cpHash for the
PCR component. The PCR selection is available in the attestation.
The name of the NV index is also required to reconstruct the cpHash for
the NvPCR components. The name is available in the attestation.
The rpHash for each component can be reconstructed from the supplied
attestation blob and signature.
In the future, we might want to add more report component types. Eg, we
could add report components for ordinary NV indexes. Using the audit
session means that we could also add additional components that the TPM
can't attest directly, such as the values of interesting TPM properties
(as the TPM2_GetCapability calls will appear in the audit session digest).
The attestation signing key is stored as a JSON file in the report
signer's state directory. Different types of keys are supported:
- Ordinary keys that are protected by an existing persistent TPM key
such as the SRK or EK.
- Persistent TPM keys.
- Primary keys, which are recreated using a template on use.
When an ordinary or primary key is used, the report signer saves the
object context in its runtime directory. This context is used on future
invocations. This has the benefit that where a primary key is used, it
doesn't need to be recreated on each use. When an ordinary key is used,
we don't need to run TPM2_Load, which requires authorization with the
parent key, on each This authorization currently requires a policy
session for low-range EKs.
Regardless of the key type, it must be a restricted signing key. If no
key exists, an ordinary key is generated automatically.
The attestation key can also have an associated credential which is
attached to the signed report. The credential can be issued by a CA or
some other party during onboarding, and is presented to a verifier as
proof that the attestation key is authentic. It is considered an opaque
blob in order to not require it to be a specific format, such as a X.509
certificate. I've called this a "voucher" though because "cred" or
"credential" has other meanings in systemd.
As a follow-up to this, I plan to add a varlink interface for creating
attestation keys that can be used for report signing.
Bind the io.systemd.SysUpdate.Notify.OnCompletedUpdate() method in the
sysext Varlink server. systemd-sysext provides a single Varlink service
covering both the sysext and confext image classes, so one notification
refreshes both (equivalent to "systemd-sysext refresh" plus
"systemd-confext refresh"). Hook a socket into
/run/systemd/sysupdate/notify/ via systemd-sysupdate-notify-sysext.socket,
enabled by default via the preset.
Add a "bootctl link-auto" verb and a matching io.systemd.BootControl.LinkAuto()
Varlink method that behave exactly like "bootctl link" / Link(), except that
the UKI and extra resources are discovered automatically instead of being
passed in. The following directories are searched, in decreasing priority:
/etc/systemd/uki/, /run/systemd/uki/, /var/lib/systemd/uki/ (where
systemd-sysupdate stages downloaded resources), /usr/local/lib/systemd/uki/
and /usr/lib/systemd/uki/.
- the UKI is taken from kernel.efi, or the best version in kernel.efi.v/
(resolved via vpick, without honouring boot-counting suffixes), from the
highest-priority directory that has one;
- extra resources are picked up from extras.d/, matching *.sysext.raw,
*.confext.raw and *.cred, each either as a plain file or as a versioned
*.v/ directory resolved via vpick, combined across all directories with
higher-priority directories winning on conflicts.
Everything is resolved relative to the pinned root directory fd. Files passed
via --extra= on the command line are linked in addition to the auto-discovered
ones.
Also bind io.systemd.SysUpdate.Notify.OnCompletedUpdate() in the boot control
Varlink server, which simply does the same as LinkAuto(), and hook a socket
into /run/systemd/sysupdate/notify/ via systemd-sysupdate-notify-bootctl.socket
(enabled by default via the preset) so a freshly downloaded kernel is linked
into $BOOT automatically after a sysupdate run.
Bind the io.systemd.SysUpdate.Notify.OnCompletedUpdate() method in the
pcrlock Varlink server and hook a socket into
/run/systemd/sysupdate/notify/ via systemd-sysupdate-notify-pcrlock.socket,
enabled by default via the preset. When sysupdate signals a completed
update, we unconditionally re-run make-policy, since the set of measured
components may have changed.
This commit exposes the last 10 high priority logs as metrics
so that the systemd-report reports them. The entries are
reported as `io.systemd.Journal.HighPriorityMessage` and
include all field as the new METRIC_FAMILY_TYPE_OBJECT.
Individual fields from a journal entry that are unprintable
(invalid utf-8) are skipped.
This is archived via a new socket-activated unit listens on
/run/systemd/report/io.systemd.Journal
A report signing backend that returns a confidential-computing
attestation report obtained via configfs-tsm. Implements
io.systemd.Report.Signer.Sign(): embeds the digest as the report's
inblob and returns the outblob (plus provider and any aux/manifest
blobs). Wired up as the "tsm" mechanism with a socket-activated service.
Signed-off-by: Paul Meyer <katexochen0@gmail.com>
This stuff is so useful, and should work out of the box I am sure. Given
that the metrics are only generated on request this shouldn't create any
additional burden by default.
Yes, this might enlarge reports a bit, if generated with everything on,
but we really should solve that at the report generation level, not at
the point where we make the metrics available.
Follow-up for: 4409e52494
In https://github.com/systemd/systemd/pull/41688 we merged metrics
and facts for systemd-report. However while some metric sources
are enabled by default (like `io.systemd.{Manager,Network}`) the
`io.systemd.Basic` service is not enabled by default.
This commit changes this and enables it by default.
We could also enable the systemd-report-cgroup.socket but that sends
a lot more data not sure that is a good default.
The new services are used to activate system and configuration extensions
for the main system from the initrd, this allows to overcome the limitation
that sysext/confext cannot be used to update the resources which are required
in the earliest boot of the system (before systemd-sysext/systemd-confext
start).
You can configure the sysfail boot entry using the bootctl command:
$ bootctl set-sysfail sysfail.conf
The value will be stored in the `LoaderEntrySysFail` EFI variable.
The `LoaderEntrySysFail` EFI variable would be unset automatically
during next boot by `systemd-boot-clear-sysfail.service` if no
system failure occured, otherwise it would be kept as it is and a system
failure reason will be saved to `LoaderSysFailReason` EFI variable.
Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Let's make the three subsystems more alike, and add remote-*setup.traget
for all three, enable them all three in the presets, and make them
behave in a similar fashion.
Let's make cryptsetup and veritysetup more symmetric, and enable the
remote target for the latter the same way we enable the remote target
for the former by default.
Enabling this service by default means every CI image without a
regular user now gets stuck on first boot due to the password prompt
from systemd-homed-firstboot.service. Let's not enable the service
by default but instead require users to enable it explicitly if they
want its behavior.
Fixes#33249
This adds a small, socket-activated Varlink daemon that can delegate UID
ranges for user namespaces to clients asking for it.
The primary call is AllocateUserRange() where the user passes in an
uninitialized userns fd, which is then set up.
There are other calls that allow assigning a mount fd to a userns
allocated that way, to set up permissions for a cgroup subtree, and to
allocate a veth for such a user namespace.
Since the UID assignments are supposed to be transitive, i.e. not
permanent, care is taken to ensure that users cannot create inodes owned
by these UIDs, so that persistancy cannot be acquired. This is
implemented via a BPF-LSM module that ensures that any member of a
userns allocated that way cannot create files unless the mount it
operates on is owned by the userns itself, or is explicitly
allowelisted.
BPF LSM program with contributions from Alexei Starovoitov.
As described in https://github.com/systemd/systemd/issues/31235, the preset
state for systemd-homed-activate.service was unclear. On the one hand, we have
a preset with 'enable systemd-homed.service', and systemd-homed.service has
'Also=systemd-homed-activate.service systemd-homed-firstboot.service', so
'preset systemd-homed.service' would also enable those two services, but
'preset systemd-homed-activate.service' would disable it, because the presets
don't say it is enabled. It seems that this configuration is internally
inconsistent. As described in the issue, maybe systemctl should be smarter
here, or warn about such configs. Either way, let's make our config consistent.
Follow-up for d1f6e01e47 and
3ccadbce33.
I think the existing sections in the preset file make sense, but
alphabetical ordering is kinda cool too.
try to find a middle ground, and at least sort within each section.
No actual change of behaviour, just some reordering of lines.
As #25459 points out our default preset is contradictory. Let's fix
that.
This enables systemd-networkd-wait-online.service, as we enable
systemd-networkd.service which enables that anyway.
This is safe since network-online.target should not be pulled in by
default.
Fixes: #25459
Before this patch the only way to prevent journald from reading the audit
messages was to mask systemd-journald-audit.socket. However this had main
drawback that downstream couldn't ship the socket disabled by default (beside
the fact that masking units is not supposed to be the usual way to disable
them).
Fixes#15777
It is used by udevd and networkd. Since udevd is enabled statically, let's also
change the preset to "on". networkd is opt-in, so let's pull in the generator
when enabling networkd too.
Boot loaders are software like any other, and hence muse be updated in
regular intervals. Let's add a simple (optional) service that updates
sd-boot automatically from the host if it is found installed but
out-of-date in the ESP.
Note that traditional distros probably should invoke "bootctl update"
directly from the package scripts whenver they update the sd-boot
package. This new service is primarily intended for image-based update
systems, i.e. where the rootfs or /usr are atomically updated in A/B
style and where the current boot loader should be synced into the ESP
from the currently booted image every now and then. It can also act as
safety net if the packaging scripts in classic systems are't doing the
bootctl update stuff themselves.
Since updating boot loaders mit be a tiny bit risky (even though we try
really hard to make them robust, by fsck'ing the ESP and mounting it only on
demand, by doing updates mostly as single file updates and by fsync()ing
heavily) this is an optional feature, i.e. subject to "systemctl
enable". However, since it's the right thing to do I think, it's enabled
by default via the preset logic.
Note that the updating logic is implemented gracefully: i.e. it's a NOP
if the boot loader is already new enough, or was never installed.
The proc-sys-fs-binfmt_misc.mount unit should not be enabled by
preset-all because it should only be used as fallback in case
proc-sys-fs-binfmt_misc.automount cannot be used on a system. In these
cases it should be enabled manually by an administrator.
This reverts commit 61c3e2c8bf.
The original commit doesn't make sense to me, none of the listed units
have an [Install] section, they hence are not subject to enable/disable
and hence not preset either. This commit hence has no effect whatsoever,
let's undo it to avoid further confusion.
let's make sure we list all singleton units we define in the preset
list, either as disable or as enable. Only four were missing, let's add
them in.
Also, let's group the pstore one with the other ones that are enabled,
right at the top.
This reverts commit 7e1ed1f3b2.
systemd-repart is not a user service that should be something people
enable/disable, instead it should just work if there's configuration for
it. It's like systemd-tmpfiles, systemd-sysusers, systemd-load-modules,
systemd-binfmt, systemd-systemd-sysctl which are NOPs if they have no
configuration, and thus don't hurt, but cannot be disabled since they
are too deep part of the OS.
This doesn't mean people couldn't disable the service if they really
want to, there's after all "systemctl mask" and build-time disabling,
but those are OS developer facing instead of admin facing, that's how it
should be.
Note that systemd-repart is in particular an initrd service, and so far
enable/disable state of those is not managed anyway via "systemctl
enable/disable" but more what dracut decides to package up and what not.
It's lightweight and generally useful, so it should be enabled by default. But
users might want to disable it for whatever reason, and things should be fine
without it, so let's make it installable so it can be disabled if wanted.
Fixes#15175.
This essentially adds another layer of configurability:
build disable, this, presence of configuration. The default is
set to enabled, because the service does nothing w/o config.
Officially we default to a "enable *", even though pretty much everybody
overrides this with "disable *". We have a bunch of targets and services which
should not be enabled by default. In case the default policy is not overriden,
our passive units would be enabled by presets, which is generally not useful at
all. So let's explicitly mark them as disabled.
Note that this effectively changes very little. E.g. on Fedora, all the units
listed in this patch were "disabled" already.
Fixes#14648.
I want to add presets/user/ later. This mirrors the layout for units:
we have units/ and units/user. The advantage is that we avoid having yet
another directory at the top level.
Lennart Poettering
Zbigniew Jędrzejewski-Szmek
Chris Coulson
Michael Vogt
Paul Meyer
Vitaly Kuznetsov
Igor Opaniuk
Lennart Poettering
Daan De Meyer
Zbigniew Jędrzejewski-Szmek
Maanya Goenka
Franck Bui
Yu Watanabe
Harald Seiler