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+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-ask-password"
+    xmlns:xi="http://www.w3.org/2001/XInclude">
+
+  <refentryinfo>
+    <title>systemd-ask-password</title>
+    <productname>systemd</productname>
+
+    <authorgroup>
+      <author>
+        <contrib>Developer</contrib>
+        <firstname>Lennart</firstname>
+        <surname>Poettering</surname>
+        <email>lennart@poettering.net</email>
+      </author>
+    </authorgroup>
+  </refentryinfo>
+
+  <refmeta>
+    <refentrytitle>systemd-ask-password</refentrytitle>
+    <manvolnum>1</manvolnum>
+  </refmeta>
+
+  <refnamediv>
+    <refname>systemd-ask-password</refname>
+    <refpurpose>Query the user for a system password</refpurpose>
+  </refnamediv>
+
+  <refsynopsisdiv>
+    <cmdsynopsis>
+      <command>systemd-ask-password <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt">MESSAGE</arg></command>
+    </cmdsynopsis>
+  </refsynopsisdiv>
+
+  <refsect1>
+    <title>Description</title>
+
+    <para><command>systemd-ask-password</command> may be used to query
+    a system password or passphrase from the user, using a question
+    message specified on the command line. When run from a TTY it will
+    query a password on the TTY and print it to standard output. When
+    run with no TTY or with <option>--no-tty</option> it will query
+    the password system-wide and allow active users to respond via
+    several agents. The latter is only available to privileged
+    processes.</para>
+
+    <para>The purpose of this tool is to query system-wide passwords
+    — that is passwords not attached to a specific user account.
+    Examples include: unlocking encrypted hard disks when they are
+    plugged in or at boot, entering an SSL certificate passphrase for
+    web and VPN servers.</para>
+
+    <para>Existing agents are:
+    <itemizedlist>
+
+      <listitem><para>A boot-time password agent asking the user for
+      passwords using Plymouth</para></listitem>
+
+      <listitem><para>A boot-time password agent querying the user
+      directly on the console</para></listitem>
+
+      <listitem><para>An agent requesting password input via a
+      <citerefentry
+      project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+      message</para></listitem>
+
+      <listitem><para>A command line agent which can be started
+      temporarily to process queued password
+      requests</para></listitem>
+
+      <listitem><para>A TTY agent that is temporarily spawned during
+      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+      invocations</para></listitem>
+    </itemizedlist></para>
+
+    <para>Additional password agents may be implemented according to
+    the <ulink
+    url="http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents">systemd
+    Password Agent Specification</ulink>.</para>
+
+    <para>If a password is queried on a TTY, the user may press TAB to
+    hide the asterisks normally shown for each character typed.
+    Pressing Backspace as first key achieves the same effect.</para>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Options</title>
+
+    <para>The following options are understood:</para>
+
+    <variablelist>
+      <varlistentry>
+        <term><option>--icon=</option></term>
+
+        <listitem><para>Specify an icon name alongside the password
+        query, which may be used in all agents supporting graphical
+        display. The icon name should follow the <ulink
+        url="http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html">XDG
+        Icon Naming Specification</ulink>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--id=</option></term>
+        <listitem><para>Specify an identifier for this password
+        query. This identifier is freely choosable and allows
+        recognition of queries by involved agents. It should include
+        the subsystem doing the query and the specific object the
+        query is done for. Example:
+        <literal>--id=cryptsetup:/dev/sda5</literal>.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--keyname=</option></term>
+        <listitem><para>Configure a kernel keyring key name to use as
+        cache for the password. If set, then the tool will try to push
+        any collected passwords into the kernel keyring of the root
+        user, as a key of the specified name. If combined with
+        <option>--accept-cached</option>, it will also try to retrieve
+        such cached passwords from the key in the kernel keyring
+        instead of querying the user right away. By using this option,
+        the kernel keyring may be used as effective cache to avoid
+        repeatedly asking users for passwords, if there are multiple
+        objects that may be unlocked with the same password. The
+        cached key will have a timeout of 2.5min set, after which it
+        will be purged from the kernel keyring. Note that it is
+        possible to cache multiple passwords under the same keyname,
+        in which case they will be stored as NUL-separated list of
+        passwords. Use
+        <citerefentry project='die-net'><refentrytitle>keyctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+        to access the cached key via the kernel keyring
+        directly. Example: <literal>--keyname=cryptsetup</literal></para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--timeout=</option></term>
+
+        <listitem><para>Specify the query timeout in seconds. Defaults
+        to 90s. A timeout of 0 waits indefinitely. </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--echo</option></term>
+
+        <listitem><para>Echo the user input instead of masking it.
+        This is useful when using
+        <filename>systemd-ask-password</filename> to query for
+        usernames. </para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--no-tty</option></term>
+
+        <listitem><para>Never ask for password on current TTY even if
+        one is available. Always use agent system.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--accept-cached</option></term>
+
+        <listitem><para>If passed, accept cached passwords, i.e.
+        passwords previously entered.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--multiple</option></term>
+
+        <listitem><para>When used in conjunction with
+        <option>--accept-cached</option> accept multiple passwords.
+        This will output one password per line.</para></listitem>
+      </varlistentry>
+
+      <varlistentry>
+        <term><option>--no-output</option></term>
+
+	<listitem><para>Do not print passwords to standard output.
+	This is useful if you want to store a password in kernel
+	keyring with <option>--keyname</option> but do not want it
+	to show up on screen or in logs.</para></listitem>
+      </varlistentry>
+
+      <xi:include href="standard-options.xml" xpointer="help" />
+    </variablelist>
+
+  </refsect1>
+
+  <refsect1>
+    <title>Exit status</title>
+
+    <para>On success, 0 is returned, a non-zero failure code
+    otherwise.</para>
+  </refsect1>
+
+  <refsect1>
+    <title>See Also</title>
+    <para>
+      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry project='die-net'><refentrytitle>keyctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+      <citerefentry project='die-net'><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+      <citerefentry project='man-pages'><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
+    </para>
+  </refsect1>
+
+</refentry>