Since run0 --help now goes through the pager, provide a way to turn that
off from the command line, like all other commands that page --help. The
option is documented the same way as for systemd-run.
--slice and --slice-inherit are intended to make the new service unit
part of a specific slice. Logind is incompatible with that goal, as a
session of any kind will prompt logind to immediately yoink the new
command from the service unit into a new session scope, which does not
inherit from run0's own slice. The use can still explicitly request a
session with --setenv=XDG_SESSION_CLASS=<class>.
Also make --slice and --slice-inherit conflict with --lightweight and
--area, which depend on logind to be effective.
This is meant to mirror sudo's -k/--reset-timestamp and
-K/--remove-timestamp options, which revoke the temporary authorization
provided by the timestamp files in /var/run/sudo/ts.
To achieve the same effect in run0, we ask polkit to revoke our
temporary authorization. If used with a command, run0 will revoke the
temporary auth and then immediately authorize the user again, just like
sudo -k. All the bus calls are completed synchronously, as they need to
complete before authorizing the user anyway.
Like sudo, the effect of -k/--reset-timestamp is to revoke only the
tmpauthz that polkit would have used to authorize the command, if
available. The -K/--remove-timestamp option will revoke all temporary
authorizations across all ttys.
I expressed the issue I have with parse_tristate_argument()
in #37751: it doesn't add any value to direct use of parse_tristate();
on the contrary, it doesn't support means to reset the arg to "auto"/-1 state.
The mere reason it existed is that we need a int type ret param.
Since the previous attempt to address this mess failed, let's
try to make the function more useful by making it accept "auto".
I figure this is useful on its own.
As requested in
https://github.com/systemd/systemd/pull/40652#discussion_r2831833996,
the function name is suffixed with _with_auto() to establish
that "auto" is handled internally.
This enables running something like
"mkosi box -- run0 --empower --same-root-dir -E PATH" to get an
empowered session as the current user within the "mkosi box" environment.
A --empower session is effectively root without being UID 0, so it
doesn't make sense to enforce polkit authentication in those. Let's
add the empower group, add --empower sessions to that group and ship
a polkit rule to skip authentication for all users in the empower
group.
(As a side-effect this will also allow users to add themselves to this
group outside of 'run0 --empower' to mimick NOPASSWD from sudo)
--empower gives full privileges to a non-root user. Currently this
includes all capabilities but we leave the option open to add more
privileges via this option in the future.
Why is this useful? When running privileged development or debugging
commands from your home directory (think bpftrace, strace and such),
you want any files written by these tools to be owned by your current
user, and not by the root user. run0 --empower will allow you to run
all privileged operations (assuming the tools check for capabilities
and not UIDs), while any files written by the tools will still be owned
by the current user.
Follow-up for f44e7a8c11
This breaks the rule stated at the beginning of help_sudo_mode():
> NB: Let's not go overboard with short options: we try to keep a modicum of compatibility with
> sudo's short switches, hence please do not introduce new short switches unless they have a roughly
> equivalent purpose on sudo. Use long options for everything private to run0.
When services start up they might query for passwords, or issue polkit
requests. Hence it makese sense to run the password query agent and
polkit agent from systemd-run. We already ran the polkit agent, this
also ensures we run the password query agent.
There's one tweak to the story though: running the agents and the pty
forwarder concurrently is messy, since they both try to read from stdin
(one potentially, the other definitely). Hence, let's time the agents
properly: invoke them when we initialize, but stop them once the start
job for the unit we are supposed to run is complete, and only then run
the pty forwarder.
With this in place, the following series of commands starts to work
really nicely (which previously deadlocked):
# homectl create foobar
# run0 -u foobar
What happens in the background in run0 is this: a new session is invoked
for "foobar", which pulls in the user@.service instance for the user.
That user@.service instance will need to unlock the homedir first. Since
8af1b296cb this will happen via the askpw
logic. With this commit here this prompt will now be shown by run0. Once
the password is entered the directory is unlocked and the real session
begins. Nice!
This new behaviour is conditioned behind --pty-late (distinct from the
existing --pty switches). For systemd-run we will never enable this mode
by default, for compat with command lines that use ExecStartPre=
(because we won't process the pty anymore during that command) For
run0 however this changes the default to --pty-late (unless
--no-ask-password is specified). This reflects the fact that run0 is
more of an interctive tool and unlikely to be used in more complex
service start-up situations with ExecStartPre= and suchlike.
This also merges JobDoneContext into RunContext, since it doesn't really
make sense to have two contexts around to communicate between outer
stack frame and event handlers. Let's just have one, and pass it around
to all handlers the same way. In particular as we should delay exit only
until both the unit's job is complete *and* in case of --wait the unit
is exited, one of the two should not suffice.
This adds a new --lightweight=yes/no switch which allows controlling
whether the invoked service will have the service manager around or not.
Moreover, this changes that if the target user is root it will now
support to the lightweight mode, i.e. run0 towards root will no longer
pull in the service manager (a real tty login via getty still will
though!).
My thinking here is that quickly raising privileges via run0 probably
shouldn't be considered a proper login but just something short lived,
temporary for a single command or similar.
This makes use of the infra introduced in 229d4a9806 to indicate visually on each prompt that we are in superuser mode temporarily.
pick ad5de3222f userdbctl: add some basic client-side filtering
For run0 (as opposed to systemd-run in general), connecting to
the system bus (of localhost or container) as a different user
than root and then trying to elevate privilege from that
makes little sense:
https://github.com/systemd/systemd/issues/32997#issuecomment-2127992973
The @ syntax is mostly useful when connecting to the user bus,
which is not a use case for run0. Hence, let's remove the example.
The syntax will be properly refused in #32999.
Naming is always a matter of preference, and the old name would certainly work,
but I think the new one has the following advantages:
- A verb is better than a noun.
- The name more similar to "the competition", i.e. 'sudo', 'pkexec', 'runas',
'doas', which generally include an action verb.
- The connection between 'systemd-run' and 'run0' is more obvious.
There has been no release yet with the old name, so we can rename without
caring for backwards compatibility.
Yu Watanabe
Luca Boccassi
Zbigniew Jędrzejewski-Szmek
Ronan Pigott
Mike Yuan
Christian Hesse
Daan De Meyer
Lennart Poettering
Jan Engelhardt
Thayne McCombs
Zbigniew Jędrzejewski-Szmek