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This incorporates various nits from the post-merge review on #21986.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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If we're consuming an on-disk seed, we usually write out a new one after
consuming it. In that case, we might be at early boot and the randomness
could be rather poor, and the kernel doesn't guarantee that it'll use
the new randomness right away for us. In order to prevent the new
entropy from getting any worse, hash together the old seed and the new
seed, and replace the final bytes of the new seed with the hash output.
This way, entropy strictly increases and never regresses.
Fixes: https://github.com/systemd/systemd/issues/21983
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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No changes in code, just some splitting out.
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We would print "...: Success", which is not too terrible, but not pretty
either.
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It may be useful when debugging daemons.
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to the kernel's pool
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GRND_NONBLOCK has been introduced with the 3.17 kernel version [1]
while adding getrandom(2) system call.
The header missing_random.h is needed for random-seed.c when building
with old toolchain, such Sourcery CodeBench ARM 2014.05 (kernel headers
3.13).
Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/454255917
[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=c6e9d6f38894798696f23c8084ca7edbf16ee895
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This makes two major changes to the way systemd-random-seed operates:
1. We now optionally credit entropy if this is configured (via an env
var). Previously we never would do that, with this change we still don't
by default, but it's possible to enable this if people acknowledge that
they shouldn't replicate an image with a contained random seed to
multiple systems. Note that in this patch crediting entropy is a boolean
thing (unlike in previous attempts such as #1062), where only a relative
amount of bits was credited. The simpler scheme implemented here should
be OK though as the random seeds saved to disk are now written only with
data from the kernel's entropy pool retrieved after the pool is fully
initialized. Specifically:
2. This makes systemd-random-seed.service a synchronization point for
kernel entropy pool initialization. It was already used like this, for
example by systemd-cryptsetup-generator's /dev/urandom passphrase
handling, with this change it explicitly operates like that (at least
systems which provide getrandom(), where we can support this). This
means services that rely on an initialized random pool should now place
After=systemd-random-seed.service and everything should be fine. Note
that with this change sysinit.target (and thus early boot) is NOT
systematically delayed until the entropy pool is initialized, i.e.
regular services need to add explicit ordering deps on this service if
they require an initialized random pool.
Fixes: #4271
Replaces: #10621 #4513
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work
There's no reason why writing should work if reading and writing
doesn't. Let's simplify this hence. /dev/urandom is generally an r/w
device, and everything else would be a serious system misconfiguration.
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That way we can reuse it elsewhere.
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Doing this properly is hard, hence let's unify the code.
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We don't load the selinux label database anyway, hence this is not going
to do anything at all. Let's simplify this hence and drop the explicit
request.
Also note that today SELinux can take the filename into account when
automatically deducing the label for a new file, hence even if this code
actually would have done something it is redundant today.
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Ideally, coccinelle would strip unnecessary braces too. But I do not see any
option in coccinelle for this, so instead, I edited the patch text using
search&replace to remove the braces. Unfortunately this is not fully automatic,
in particular it didn't deal well with if-else-if-else blocks and ifdefs, so
there is an increased likelikehood be some bugs in such spots.
I also removed part of the patch that coccinelle generated for udev, where we
returns -1 for failure. This should be fixed independently.
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Let's reduce the common boilerplate and have a single setup function
used by all service code to setup logging.
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This way, we can extend the macro a bit with stuff pulled in from other
headers without this affecting everything which pulls in macro.h, which
is one of our most basic headers.
This is just refactoring, no change in behaviour, in prepartion for
later changes.
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This is some extra protection for sloppy "golden master" systems, where
images are duplicated many times but the random seed is not
deleted (or reset for each copy). That golden master systems have to
reset /etc/machine-id is better known, and easier to notice (as having
the same ID will result in address conflicts and suchlike quite often).
Hence let's write the machine ID into /dev/urandom, in case it has been
initialized and unlikely the stored random seed has been provisioned
differently on each image.
Note that we don't credit the entropy either way, hence in the case
there's a cycle of a) generating the machine-id early at boot and b)
writing it back into /dev/urandom late at boot it shouldn't matter. It's
never going to make things worse, just in a few cases better.
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Previously, we'd only ever read 512 byte from the random seed file,
under the assumption we won't need more. With this change we'll read the
full file, even if it is larger.
The idea behind htis change is that people can dump additional data into the
random seed file offline if they like, and it can be low quality, and
we'll seed the pool with it anyway. Moreover, if people are paranoid and
want us to save/restore a bigger seed, it's easy to do: just truncate
the file to the right size and we'll save/restore as much in the future.
This also reworks the file a bit, introducing two clear if blocks that
load and that save the random seed, and that each are conditionalized
more carefully.
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These lines are generally out-of-date, incomplete and unnecessary. With
SPDX and git repository much more accurate and fine grained information
about licensing and authorship is available, hence let's drop the
per-file copyright notice. Of course, removing copyright lines of others
is problematic, hence this commit only removes my own lines and leaves
all others untouched. It might be nicer if sooner or later those could
go away too, making git the only and accurate source of authorship
information.
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This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
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Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
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This follows what the kernel is doing, c.f.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fd54ace4721fc5ce2bb5aef6318fcf17f421460.
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v2:
- also mention m4
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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If /var is read-only, and the seed file does not exist, we would print
a misleading error message for ENOENT. Print both messages instead, to
make it easy to diagonose.
Also, treat the cases of missing seed file the same as empty seed file
and exit successfully. Initialize the return code properly.
Fixes https://github.com/systemd/systemd/issues/2530,
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813599.
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There are more than enough to deserve their own .c file, hence move them
over.
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string-util.[ch]
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
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Patch via coccinelle.
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When we call 'systemd-random-seed load' with a read-only /var/lib/systemd,
the cleanup code (which rewrites the random-seed file) will fail and exit.
Arguably, if the filesystem is read-only and the random-seed file exists
then this will be possibly be quite bad for entroy on subsequent reboots
but it should still not make the unit fail.
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loop_write() didn't follow the usual systemd rules and returned status
partially in errno and required extensive checks from callers. Some of
the callers dealt with this properly, but many did not, treating
partial writes as successful. Simplify things by conforming to usual rules.
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If the format string contains %m, clearly errno must have a meaningful
value, so we might as well use log_*_errno to have ERRNO= logged.
Using:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\((".*%m.*")/log_\1_errno(errno, \2/'
Plus some whitespace, linewrap, and indent adjustments.
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It corrrectly handles both positive and negative errno values.
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As a followup to 086891e5c1 "log: add an "error" parameter to all
low-level logging calls and intrdouce log_error_errno() as log calls
that take error numbers", use sed to convert the simple cases to use
the new macros:
find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/'
Multi-line log_*() invocations are not covered.
And we also should add log_unit_*_errno().
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The file node is /dev/urandom, not /dev/random.
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context
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