5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
184 lines
7.9 KiB
XML
184 lines
7.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="systemd-ask-password">
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<refentryinfo>
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<title>systemd-ask-password</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-ask-password</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-ask-password</refname>
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<refpurpose>Query the user for a system password</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-ask-password <arg choice="opt" rep="repeat">OPTIONS</arg> <arg choice="opt">MESSAGE</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>systemd-ask-password</command> may be
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used to query a system password or passphrase from the
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user, using a question message specified on the
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command line. When run from a TTY it will query a
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password on the TTY and print it to STDOUT. When run
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with no TTY or with <option>--no-tty</option> it will
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query the password system-wide and allow active users
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to respond via several agents. The latter is
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only available to privileged processes.</para>
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<para>The purpose of this tool is to query system-wide
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passwords -- that is passwords not attached to a
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specific user account. Examples include: unlocking
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encrypted hard disks when they are plugged in or at
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boot, entering an SSL certificate passphrase for web
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and VPN servers.</para>
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<para>Existing agents are: a boot-time password agent
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asking the user for passwords using Plymouth; a
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boot-time password agent querying the user directly on
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the console; an agent requesting password input via a
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<citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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message; an agent suitable for running in a GNOME
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session; a command line agent which can be started
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temporarily to process queued password requests; a TTY
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agent that is temporarily spawned during
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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invocations.</para>
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<para>Additional password agents may be implemented
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according to the <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/PasswordAgents">systemd
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Password Agent Specification</ulink>.</para>
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<para>If a password is queried on a tty the user may
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press TAB to hide the asterisks normally shown for
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each character typed. Pressing Backspace as first key
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achieves the same effect.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--h</option></term>
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<term><option>--help</option></term>
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<listitem><para>Prints a short help
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text and exits.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--icon=</option></term>
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<listitem><para>Specify an icon name
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alongside the password query, which may
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be used in all agents supporting
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graphical display. The icon name
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should follow the <ulink
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url="http://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html">XDG
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Icon Naming
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Specification</ulink>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--timeout=</option></term>
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<listitem><para>Specify the query
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timeout in seconds. Defaults to
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90s.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-tty</option></term>
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<listitem><para>Never ask for password
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on current TTY even if one is
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available. Always use agent
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system.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--accept-cached</option></term>
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<listitem><para>If passed accept
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cached passwords, i.e. passwords
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previously typed in.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--multiple</option></term>
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<listitem><para>When used in
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conjunction with
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<option>--accept-cached</option>
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accept multiple passwords. This will
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output one password per
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line.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>On success 0 is returned, a non-zero failure
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code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>wall</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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