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Given we only need a single field off the ExecLoadCredential structure
we don't have to link it as a whole, but just copy that one bit over
directly, simplifying the struct a bit.
recurse_dir() allows specifiying a freely choosable initial path to
which to append the subdirs as it descends into the tree. If we pass the
configured id there, recurse_dir() will suffix the subdir to that for
us, so that we don't have to do that manually anymore in the callback,
simplifying things a bit.
Let's just simplify the logic and pass the fields we need as regular
arguments, even if that means the function now has a lot. It's otherwise
really weird that we have to fake a local ExecLoadCredential from the
real one.
We recently added caching for the dependencies we build from source
in mkosi's github action which speeds up builds by +-10 minutes. Let's
update to the latest commit so we benefit from this in systemd's mkosi
CI as well.
We use authenticated encryption, and that deserves mention. This in
particular relevant as the fact they are authenticated makes the
credentials useful as initrd parameterization items.
LoadCredentials= in unit files supports a syntax passing a single string
only (in which case the credentials are propagated down from the host).
but systemd-run's --property= setting doesn't allow that yet. Fix that.
The overflow check for ref counting should not be subject to NDEBUG,
hence upgrade assert() → assert_se(). (The check for zero is an
immediate bug in our code, and should be impossible to trigger, hence
it's fine if the check is optimized away if people are crazy enough to
set NDEBUG, so that can stay assert())
https://github.com/systemd/systemd/pull/23099#discussion_r854341850
It's not trivial to figure out that this function does not search
for an exact match for the given needle, but whichever object in
the given direction that's closest to the needle.
Let's add a documentation blurb to explain how the function works
for to help future developers looking at this function.
This is supposed to be useful when generating credentials for immutable
initrd environments, where it is is relevant to support credentials even
on systems lacking a TPM2 chip.
With this, if `systemd-creds encrypt --with-key=auto-initrd` is used a
credential will be encrypted/signed with the TPM2 if it is available and
recognized by the firmware. Otherwise it will be encrypted/signed with
the fixed empty key, thus providing no confidentiality or authenticity.
The idea is that distributions use this mode to generically create
credentials that are as locked down as possible on the specific
platform.
Previously, when encrypting creds you could pick which key to use for
this via a 128bit ID identifying the key type, and use an all zero ID
for rquesting automatic mode.
Let's change this to use an explicitly picked 128bit ID for automatic
mode, i.e. something other than all zeros. This is in preparation for
adding one further automatic mode with slightly different semantics.
no change in behaviour.
Note that the new 128bit id is never written to disk but only used
internally to indicate a specific case.
Sometimes it's useful from shell scripts to check if we have a working
TPM2 chip around. For example, when putting together encrypted
credentials for the initrd (after all: it might be wise to place the
root pw in a credential for the initrd to consume, but do so only if we
can lock it to the TPM2, and not otherwise, so that we risk nothing).
Hence, let's add a new "systemd-creds has-tpm2" verb: it returns zero if we
have a working TPM2 (which means: supported by kernel + firmware + us),
or non-zero otherwise. Also show which parts are available.
Use-case: in future the 'kernel-install' script should use this when
deciding whether to augment kernels with security sensitive credentials.
Let's improve the output regarding TPM2 support in "bootctl": let's show
whether we have local driver support and/or firmware support, and
colorize it.
(For now, don't show if we natively support TPM2, since the tool is
mostly bout boot time stuff, where it dosn't really matter much what we
do in userspace)
So far we were a bit sloppy regarding checks for TPM2 support. Let's
make things more precise and introduce a single helper that checks for
three axis of TPM2 support: whether we have a loaded kernel driver,
whether the firmware used it, and whether we ourselves are compiled for
it.
This only adds the helper. Follow-up patches will use it at various
places.
Follow-up for cd3c6322db
journal-def.h should be self-contained too, as it represents the journal object ABI.
Duplicate the enums, as they also need to be in config.h for it to be self-contained,
and enums are not available to the preprocessor. Use an assert to ensure they don't
diverge.
RestrictNamespaces should block clone3() like flatpak:
a10f52a756
clone3() passes arguments in a structure referenced by a pointer, so we can't
filter on the flags as with clone(). Let's disallow the whole function call.
Follow-up for 2362fdde1b
When --machine is specified with --ephemeral, no random suffix is added, so
the recently added assert would fail.
Add a top-level variable with the expected file name for nspawn files, and
compute it when the rest of the names are computed.
