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processes
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containers on a 64bit host
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seccomp setup
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And make use of it where appropriate for executing services and for
nspawn.
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Arch Linux uses nspawn as a container for building packages and needs
to be able to start a 32bit chroot from a 64bit host. 24fb11120756
disrupted this feature when seccomp handling was added.
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This mimics the sd-bus api, as we may need it in the future.
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This adds the host side of the veth link to the given bridge.
Also refactor the creation of the veth interfaces a bit to set it up
from the host rather than the container. This simplifies the addition
to the bridge, but otherwise the behavior is unchanged.
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We can always know the size based on the type, so let's do this inside the library.
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When invoked without -D in an arbitrary directory we should not try to
execute anything, make some validity checks first.
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containers
The kernel still doesn't support audit in containers, so let's make use
of seccomp and simply turn it off entirely. We can get rid of this big
as soon as the kernel is fixed again.
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one operation
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sd_rtnl_xxx_new_yyy()
So far we followed the rule to always indicate the "flavour" of
constructors after the "_new_" or "_open_" in the function name, so
let's keep things in sync here for rtnl and do the same.
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The "sd_" prefix is supposed to be used on exported symbols only, and
not in the middle of names. Let's drop it from the cleanup macros hence,
to make things simpler.
The bus cleanup macros don't carry the "sd_" either, so this brings the
APIs a bit nearer.
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into the container
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of this
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or services) as machine with machined
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the container with machined
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namespacing
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Let's always call the security labels the same way:
SMACK: "Smack Label"
SELINUX: "SELinux Security Context"
And the low-level encapsulation is called "seclabel". Now let's hope we
stick to this vocabulary in future, too, and don't mix "label"s and
"security contexts" and so on wildly.
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/etc/os-release is expected for the case for booting a full system, and
need not be required for thin container execution.
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the API file systems, nothing else
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- As suggested, prefix argument variables with "arg_" how we do this
usually.
- As suggested, don't involve memory allocations when storing command
line arguments.
- Break --help text at 80 chars
- man: explain that this is about SELinux
- don't do unnecessary memory allocations when putting together mount
option string
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This patch adds to new options:
-Z PROCESS_LABEL
This specifies the process label to run on processes run within the container.
-L FILE_LABEL
The file label to assign to memory file systems created within the container.
For example if you wanted to wrap an container with SELinux sandbox labels, you could execute a command line the following
chcon system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -R /srv/container
systemd-nspawn -L system_u:object_r:svirt_sandbox_file_t:s0:c0,c1 -Z system_u:system_r:svirt_lxc_net_t:s0:c0,c1 -D /srv/container /bin/sh
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Similar to PrivateNetwork=, PrivateTmp= introduce PrivateDevices= that
sets up a private /dev with only the API pseudo-devices like /dev/null,
/dev/zero, /dev/random, but not any physical devices in them.
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namespace
On kdbus user credentials are not translated across PID namespaces, but
simply invalidated if sender and receiver namespaces don't match. This
makes it impossible to properly authenticate requests from different PID
namespaces (which is probably a good thing). Hence, register the machine
in the parent and not the client and properly synchronize this.
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container to spawn
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If --link-journal=host or --link-journal=guest is used, this totally
cannot work and we exit with an error. If however --link-journal=auto
or --link-journal=no is used, just display a warning.
Having the same machine id can happen if booting from the same
filesystem as the host. Since other things mostly function correctly,
let's allow that.
https://bugs.freedesktop.org/show_bug.cgi?id=68369
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kdbus fortunately exposes the container's busses in the host fs, hence
we can access it directly instead of doing the namespacing dance.
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The only problem is that libgen.h #defines basename to point to it's
own broken implementation instead of the GNU one. This can be fixed
by #undefining basename.
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everywhere
We want to emphasize bus connections as per-thread communication
primitives, hence introduce a concept of a per-thread default bus, and
make use of it everywhere.
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bus_log_parse_error()
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Among other things this makes sure we always expose a --version command
and show it in the help texts.
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