Fix#9993. When this code was split out to user-runtime-dir, it forgot to
include the call to mac_selinux_init(). So mkdir_label() stopped working.
Fixes: a9f0f5e501 ("logind: split %t directory creation to a helper
unit")
Let's fold get_user_creds_clean() into get_user_creds(), and introduce a
flags argument for it to select "clean" behaviour. This flags parameter
also learns to other new flags:
- USER_CREDS_SYNTHESIZE_FALLBACK: in this mode the user records for
root/nobody are only synthesized as fallback. Normally, the synthesized
records take precedence over what is in the user database. With this
flag set this is reversed, and the user database takes precedence, and
the synthesized records are only used if they are missing there. This
flag should be set in cases where doing NSS is deemed safe, and where
there's interest in knowing the correct shell, for example if the
admin changed root's shell to zsh or suchlike.
- USER_CREDS_ALLOW_MISSING: if set, and a UID/GID is specified by
numeric value, and there's no user/group record for it accept it
anyway. This allows us to fix#9767
This then also ports all users to set the most appropriate flags.
Fixes: #9767
[zj: remove one isempty() call]
This is a bit like the info link in most of GNU's --help texts, but we
don't do info but man pages, and we make them properly clickable on
terminal supporting that, because awesome.
I think it's generally advisable to link up our (brief) --help texts and
our (more comprehensive) man pages a bit, so this should be an easy and
straight-forward way to do it.
As the comments already say it might be quite likely that
$XDG_RUNTIME_DIR is not set up as mount, and we shouldn't complain about
that.
Moreover, let's make this idempotent, so that a runtime dir that is
already gone and is removed again doesn't cause failure.
This makes hibernation unavailable if the kernel image we are currently
running was removed. This is supposed to be superficial protection
against hibernating a system we can never return from because the kernel
has been updated and the kernel we currently run is not available
anymore.
We look at a couple of places for the kernel, which should cover all
distributions I know off. Should I have missed a path I am sure people
will quickly notice and we can add more places to check. (or maybe
convince those distros to stick their kernels at a standard place)
We so far had various placed we'd parse percentages with
parse_percent(). Let's make them use parse_permille() instead, which is
downward compatible (as it also parses percent values), and increases
the granularity a bit. Given that on the wire we usually normalize
relative specifications to something like UINT32_MAX anyway changing
from base-100 to base-1000 calculations can be done easily without
breaking compat.
This commit doesn't document this change in the man pages. While
allowing more precise specifcations permille is not as commonly
understood as perent I guess, hence let's keep this out of the docs for
now.
We likely get the data from the env block, but we might also determine
it from elsewhere (such as PAM module parameters). Let's set the env
vars on the env block explicitly, so that they are available always, and
apps can rely on it.
Let's make this symmetric with XDG_SESSION_CLASS and XDG_SESSION_TYPE,
so that PAM stacks can configure this easily without involving env vars,
in case there are PAM session managers which only support a single
desktop anyway.
Since D-Bus 1.9.14 (2015-03-02) dbus looks in $XDG_RUNTIME_DIR/bus for
the system bus on its own, hence we can finally drop setting this
environment variable. gdbus since glib 2.45.3 (June 2015) also supports
it.
Currently to set the flag to reboot into the firmware setup an
authentication by an administrative user is required. Since we are
already enabling active users to reboot the system, it is advisable to
let the user decide if he wants to boot into the firmware setup without
any more hassle.
When unmounting user runtime directory, only UID is necessary,
and the corresponding user may not exist anymore.
This makes first try to parse the input by parse_uid(), and only if it
fails, prase the input by get_user_creds().
Fixes#9541.
If --dev-kvm-mode is set to something different then 0666, which we
explicitly support, it makes sense to still apply the uaccess tag to
/dev/kvm. For distros which opt to use the default 0666, this change is
a nop.
This partially reverts commit b8fd3d8220.
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.
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.
They are not needed, because anything that is non-zero is converted
to true.
C11:
> 6.3.1.2: When any scalar value is converted to _Bool, the result is 0 if the
> value compares equal to 0; otherwise, the result is 1.
https://stackoverflow.com/questions/31551888/casting-int-to-bool-in-c-c
Let's show a message at the time of logout i.e. entering the "closing"
state, not just e.g. once the user closes `tmux` and the session can be
removed completely. (At least when KillUserProcesses=no applies. My
thinking was we can spare the log noise if we're killing the processes
anyway).
These are two independent events. I think the logout event is quite
significant in the session lifecycle. It will be easier for a user who
does not know logind details to understand why "Removed session" doesn't
appear at logout time, if we have a specific message we can show at this
time :).
Tested using tmux and KillUserProcesses=no. I can also confirm the extra
message doesn't show when using KillUserProcesses=yes. Maybe it looks a
bit mysterious when you use KillOnlyUsers= / KillExcludeUsers=, but
hopefully not alarmingly so.
I was looking at systemd-logind messages on my system, because I can
reproduce two separate problems with Gnome on Fedora 28 where
sessions are unexpectedly in state "closing". (One where a GUI session
limps along in a degraded state[1], and another where spice-vdagent is left
alive after logout, keeping the session around[2]). It logged when
sessions were created and removed, but it didn't log when the session
entered the "closing" state.
[1] https://bugzilla.redhat.com/show_bug.cgi?id=1583240#c1
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1583261Closes#9096
Most our other parsing functions do this, let's do this here too,
internally we accept that anyway. Also, the closely related
load_env_file() and load_env_file_pairs() also do this, so let's be
systematic.
Externally it's an uint64_t anyway, and internally we most just
initialize it to physical_memory() which returns uint64_t, hence there's
exactly zero value in using it as size_t internally. Hence, let's fix
that, and use uint64_t everywhere.
