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If people use nspawn in their $HOME we should allow this inodes owned by
this special UID to be created temporarily, so that UID mapped nspawn
containers just work.
When using user namespaces in conjunction with uidmapped mounts, nspawn
so far set up two uidmappings:
1. One that is used for the uidmapped mount and that maps the UID range
0…65535 on the backing fs to some high UID range X…X+65535 on the
uidmapped fs. (Let's call this mapping the "mount mapping")
2. One that is used for the userns namespace the container payload
processes run in, that maps X…X+65535 back to 0…65535. (Let's call
this one the "process mapping").
These mappings hence are pretty much identical, one just moves things up
and one back down. (Reminder: we do all this so that the processes can
run under high UIDs while running off file systems that require no
recursive chown()ing, i.e. we want processes with high UID range but
files with low UID range.)
This creates one problem, i.e. issue #20989: if nspawn (which runs as
host root, i.e. host UID 0) wants to add inodes to the uidmapped mount
it can't do that, since host UID 0 is not defined in the mount mapping
(only the X…X+65536 range is, after all, and X > 0), and processes whose
UID is not mapped in a uidmapped fs cannot create inodes in it since
those would be owned by an unmapped UID, which then triggers
the famous EOVERFLOW error.
Let's fix this, by explicitly including an entry for the host UID 0 in
the mount mapping. Specifically, we'll extend the mount mapping to map
UID 2147483646 (which is INT32_MAX-1, see code for an explanation why I
picked this one) of the backing fs to UID 0 on the uidmapped fs. This
way nspawn can creates inode on the uidmapped as it likes (which will
then actually be owned by UID 2147483646 on the backing fs), and as it
always did. Note that we do *not* create a similar entry in the process
mapping. Thus any files created by nspawn that way (and not chown()ed to
something better) will appear as unmapped (i.e. as overflowuid/"nobody")
in the container payload. And that's good. Of course, the latter is
mostly theoretic, as nspawn should generally chown() the inodes it
creates to UID ranges that actually make sense for the container (and we
generally already do this correctly), but it#s good to know that we are
safe here, given we might accidentally forget to chown() some inodes we
create.
Net effect: the two mappings will not be identical anymore. The mount
mapping has one entry more, and the only reason it exists is so that
nspawn can access the uidmapped fs reasonably independently from any
process mapping.
Fixes: #20989
And enable cgroup delegation for udevd.
Then, processes invoked through ExecReload= are assigned .control
subcgroup, and they are not killed by cg_kill().
Fixes#16867 and #22686.
varlink_error(...) expects a json object as the third parameter. Passing a string variant causes
parameter sanitization to fail, and it returns -EINVAL. Pass object variant instead.
If the prefix is only referenced by sd_radv, then the returned pointer
is already freed.
networkd does not uses the returned value. Let's voidify the function.
Use a salted, unbound HMAC session with the primary key used as tpmKey,
which mean that the random salt will be encrypted with the primary
key while in transit. Decrypt/encrypt flags are set on the new session
with AES in CFB mode. There is no fallback to XOR mode.
This provides confidentiality and replay protection, both when sealing
and unsealing. There is no protection against man in the middle
attacks since we have no way to authenticate the TPM at the moment.
The exception is unsealing with PIN, as an attacker will be unable
to generate the proper HMAC digest.
Conceptually the feature is great and should exist, but in its current
form should be worked to be generic (i.e. not specific to
Windows/Bitlocker, but appliable to any boot entry), not be global (but
be a per-entry thing), not require a BootXXXX entry to exist, and not
check for the BitLocker signature (as TPMs are not just used for
BitLocker).
Since we want to get 251 released, mark it in the documentation, in NEWS
and in code as experimental and make clear it will be reworked in a
future release. Also, make it opt-in to make it less likely people come
to rely on it without reading up on it, and understanding that it will
likely change sooner or later.
Follow-up for: #22043
See: #22390
Apparently Grub is measuring all kinds of garbage into PCR 8. Since people
apparently chainload sd-boot from grub, let's thus stay away from PCR 8,
and use PCR 12 instead for the kernel command line.
As discussed here: #22635Fixes: #22635
It's not a pointer after all, but a numeric value. As such the const
applies to the value and not the target, but we genreally don#t do that
for value parameters. Hence drop the const.
So far we set the "trusted.delegate" xattr on cgroups where delegation
is on. This duplicates this behaviour with the "user.delegate" xattr.
This has two benefits:
1. unprivileged clients can *read* the xattr. "systemd-cgls" can thus
show delegated cgroups as such properly, even when invoked without
privs
2. unprivileged systemd instances can set the xattr, i.e. when systemd
--user delegates a cgroup to further payloads.
This weakens security a tiny bit, given that code that got a cgroup
delegated can manipulate the xattr, but I think that's OK, given they
have a higher trust level regarding cgroups anyway, if they got a
subtree delegated, and access controls on the cgroup itself are still
enforced. Moreover PID 1 as the cgroup manager only sets these xattrs,
never reads them — the xattr is primarily a way to tell payloads about
the delegation, and it's strictly this one way.
Add tests for enrolling and unlocking. Various cases are tested:
- Default PCR 7 policy w/o PIN, good and bad cases (wrong PCR)
- PCR 7 + PIN policy, good and bad cases (wrong PCR, wrong PIN)
- Non-default PCR 0+7 policy w/o PIN, good and bad cases (wrong PCR 0)
v2: rename test, fix tss2 library installation, fix CI failures
v3: fix ppc64, load module
Handle the case where TPM2 metadata is not available and explicitly
provided in crypttab. This adds a new "tpm2-pin" option to crypttab
options for this purpose.
This is unfinished: we don't have any way to actually query for PINs
interactively this way. It is similar to FIDO2 and PKCS#11 in this
regard.
Nonetheless, this code is capable of validating and dumping tokens, so
it is already useful as-is.
Add support for PIN enrollment with TPM2. A new "tpm2-pin" field is
introduced into metadata to signal that the policy needs to include a
PIN.
v2: fix tpm2_make_luks2_json in sd-repart
