DESCRIPTION¶
System and Service Credentials[1] are data objects that may
be passed into booted systems or system services as they are invoked. They
can be acquired from various external sources, and propagated into the
system and from there into system services. Credentials may optionally be
encrypted with a machine-specific key and/or locked to the local TPM2
device, and are only decrypted when the consuming service is invoked.
System credentials may be used to provision and configure various
aspects of the system. Depending on the consuming component credentials are
only used on initial invocations or are needed for all invocations.
Credentials may be used for any kind of data, binary or text, and
may carry passwords, secrets, certificates, cryptographic key material,
identity information, configuration, and more.
WELL KNOWN SYSTEM CREDENTIALS¶
firstboot.keymap
The console key mapping to set (e.g. "de").
Read by
systemd-firstboot(1), and only honoured if no console keymap
has been configured before.
Added in version 252.
firstboot.locale, firstboot.locale-messages
The system locale to set (e.g. "de_DE.UTF-8").
Read by
systemd-firstboot(1), and only honoured if no locale has been
configured before.
firstboot.locale sets "LANG", while
firstboot.locale-message sets "LC_MESSAGES".
Added in version 252.
firstboot.timezone
The system timezone to set (e.g.
"Europe/Berlin"). Read by
systemd-firstboot(1), and only
honoured if no system timezone has been configured before.
Added in version 252.
login.issue
The data of this credential is written to
/etc/issue.d/50-provision.conf, if the file doesn't exist yet.
agetty(8) reads this file and shows its contents at the login prompt of
terminal logins. See
issue(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
login.motd
The data of this credential is written to
/etc/motd.d/50-provision.conf, if the file doesn't exist yet.
pam_motd(8) reads this file and shows its contents as "message of
the day" during terminal logins. See
motd(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
network.hosts
The data of this credential is written to /etc/hosts, if
the file doesn't exist yet. See
hosts(5) for details.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
network.dns, network.search_domains
network.conf.*, network.link.*,
network.netdev.*, network.network.*
Configures network devices. Read by
systemd-network-generator.service(8). These credentials should contain
valid
networkd.conf(5),
systemd.link(5),
systemd.netdev(5),
systemd.network(5) configuration data. From
each matching credential a separate file is created. Example: the contents of
a credential network.link.50-foobar will be copied into a file 50-foobar.link.
Note that the resulting files are created world-readable, it's
hence recommended to not include secrets in these credentials, but supply
them via separate credentials directly to systemd-networkd.service, e.g.
network.wireguard.* as described below.
Added in version 256.
network.wireguard.*
passwd.hashed-password.root,
passwd.plaintext-password.root
May contain the password (either in UNIX hashed format,
or in plaintext) for the root users. Read by both
systemd-firstboot(1)
and
systemd-sysusers(1), and only honoured if no root password has been
configured before.
Added in version 252.
passwd.shell.root
The path to the shell program (e.g.
"/bin/bash") for the root user. Read by both
systemd-firstboot(1) and
systemd-sysusers(1), and only honoured
if no root shell has been configured before.
Added in version 252.
ssh.authorized_keys.root
The data of this credential is written to
/root/.ssh/authorized_keys, if the file doesn't exist yet. This allows
provisioning SSH access for the system's root user.
Consumed by /usr/lib/tmpfiles.d/provision.conf, see
tmpfiles.d(5).
Added in version 252.
ssh.listen
May be used to configure SSH sockets the system shall be
reachable on. See
systemd-ssh-generator(8) for details.
Added in version 256.
sysusers.extra
Additional
sysusers.d(5) lines to process during
boot.
Added in version 252.
sysctl.extra
Additional
sysctl.d(5) lines to process during
boot.
Added in version 252.
tmpfiles.extra
Additional
tmpfiles.d(5) lines to process during
boot.
Added in version 252.
fstab.extra
vconsole.keymap, vconsole.keymap_toggle,
vconsole.font, vconsole.font_map,
vconsole.font_unimap
Console settings to apply, see
systemd-vconsole-setup.service(8) for details.
Added in version 253.
getty.ttys.serial, getty.ttys.container
journal.forward_to_socket
vmm.notify_socket
Configures an
sd_notify(3) compatible
AF_VSOCK socket the service manager will report status information,
ready notification and exit status on. For details see
systemd(1).
Added in version 253.
system.machine_id
Takes a 128bit ID to initialize the machine ID from (if
it is not set yet). Interpreted by the service manager (PID 1). For details
see
systemd(1).
Added in version 254.
system.hostname
Accepts a (transient) hostname to configure during early
boot. The static hostname specified in /etc/hostname, if configured, takes
precedence over this setting. Interpreted by the service manager (PID 1). For
details see
systemd(1).
Added in version 254.
home.create.*
Creates a home area for the specified user with the user
record data passed in. For details see
homectl(1).
Added in version 256.
cryptsetup.passphrase, cryptsetup.tpm2-pin,
cryptsetup.fido2-pin, cryptsetup.pkcs11-pin,
cryptsetup.luks2-pin
Specifies the passphrase/PINs to use for unlock encrypted
storage volumes. For details see
systemd-cryptsetup(8).
Added in version 256.
systemd.extra-unit.*, systemd.unit-dropin.*
These credentials specify extra units and drop-ins to add
to the system. For details see
systemd-debug-generator(8).
Added in version 256.
udev.conf.*, udev.rules.*
Configures udev configuration file and udev rules. Read
by systemd-udev-load-credentials.service, which invokes
udevadm control
--load-credentials. These credentials directly translate to a matching
udev.conf(5) or
udev(7) rules file. Example: the contents of a
credential udev.conf.50-foobar will be copied into a file
/run/udev/udev.conf.d/50-foobar.conf, and udev.rules.50-foobar will be copied
into a file /run/udev/rules.d/50-foobar.rules. See
udev(7),
udev.conf(5), and
udevadm(8) for details.
Added in version 256.
