mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-29 11:21:33 +03:00
85 lines
3.8 KiB
XML
85 lines
3.8 KiB
XML
<?xml version="1.0"?>
|
|
<!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1+ -->
|
|
<refentry id="systemd-cryptsetup@.service" conditional='HAVE_LIBCRYPTSETUP'>
|
|
|
|
<refentryinfo>
|
|
<title>systemd-cryptsetup@.service</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-cryptsetup@.service</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-cryptsetup@.service</refname>
|
|
<refname>systemd-cryptsetup</refname>
|
|
<refpurpose>Full disk decryption logic</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>systemd-cryptsetup@.service</filename></para>
|
|
<para><filename>/usr/lib/systemd/systemd-cryptsetup</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><filename>systemd-cryptsetup@.service</filename> is a
|
|
service responsible for setting up encrypted block devices. It is
|
|
instantiated for each device that requires decryption for
|
|
access.</para>
|
|
|
|
<para><filename>systemd-cryptsetup@.service</filename> will ask
|
|
for hard disk passwords via the <ulink
|
|
url="https://systemd.io/PASSWORD_AGENTS/">password agent logic</ulink>, in
|
|
order to query the user for the password using the right mechanism at boot
|
|
and during runtime.</para>
|
|
|
|
<para>At early boot and when the system manager configuration is reloaded, <filename>/etc/crypttab</filename> is
|
|
translated into <filename>systemd-cryptsetup@.service</filename> units by
|
|
<citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
|
|
|
|
<para>In order to unlock a volume a password or binary key is
|
|
required. <filename>systemd-cryptsetup@.service</filename> tries to acquire a suitable password or binary
|
|
key via the following mechanisms, tried in order:</para>
|
|
|
|
<orderedlist>
|
|
<listitem><para>If a key file is explicitly configured (via the third column in
|
|
<filename>/etc/crypttab</filename>), a key read from it is used. If a PKCS#11 token is configured
|
|
(using the <varname>pkcs11-uri=</varname> option) the key is decrypted before use.</para></listitem>
|
|
|
|
<listitem><para>If no key file is configured explicitly this way, a key file is automatically loaded
|
|
from <filename>/etc/cryptsetup-keys.d/<replaceable>volume</replaceable>.key</filename> and
|
|
<filename>/run/cryptsetup-keys.d/<replaceable>volume</replaceable>.key</filename>, if present. Here
|
|
too, if a PKCS#11 token is configured, any key found this way is decrypted before
|
|
use.</para></listitem>
|
|
|
|
<listitem><para>If the <varname>try-empty-password</varname> option is specified it is then attempted
|
|
to unlock the volume with an empty password.</para></listitem>
|
|
|
|
<listitem><para>The kernel keyring is then checked for a suitable cached password from previous
|
|
attempts.</para></listitem>
|
|
|
|
<listitem><para>Finally, the user is queried for a password, possibly multiple times.</para></listitem>
|
|
</orderedlist>
|
|
|
|
<para>If no suitable key may be acquired via any of the mechanisms describes above, volume activation fails.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>systemd-cryptsetup-generator</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
|
<citerefentry project='die-net'><refentrytitle>cryptsetup</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
</para>
|
|
</refsect1>
|
|
|
|
</refentry>
|