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Viewing changes to plugins.d/password-prompt.xml

Committer: Teddy Hogeborn
Date: 2008-09-06 15:41:27 UTC
Revision ID: teddy@fukt.bsnet.se-20080906154127-oxfrwsrbu0inhljv

* plugin-runner.c (main): Bug fix: use built-in default value if
"--plugin-dir" was not used.

files added:
.bzrignore

COPYING

README

default-mandos

init.d-mandos

initramfs-tools-hook

initramfs-tools-hook-conf

initramfs-tools-script

legalnotice.xml

mandos-clients.conf.xml

mandos-keygen

mandos-keygen.xml

mandos-options.xml

mandos.conf.xml

mandos.xml

overview.xml

plugin-runner.conf

plugin-runner.xml

plugins.d/password-prompt.xml

plugins.d/password-request.xml

plugins.d/usplash

files removed:
network-protocol.txt

files renamed:
mandos-client.c => plugin-runner.c

files modified:
Makefile

TODO

clients.conf

mandos

mandos.conf

plugins.d/password-prompt.c

plugins.d/password-request.c

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added added

removed removed

plugins.d/password-prompt.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"

"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [

<!ENTITY VERSION "1.0">

<!ENTITY COMMANDNAME "password-prompt">

<!ENTITY TIMESTAMP "2008-09-04">

<title>Mandos Manual</title>

<productname>Mandos</productname>

<productnumber>&VERSION;</productnumber>

<date>&TIMESTAMP;</date>

<firstname>Björn</firstname>

<surname>Påhlsson</surname>

<email>belorn@fukt.bsnet.se</email>

</address>

</author>

<firstname>Teddy</firstname>

<surname>Hogeborn</surname>

<email>teddy@fukt.bsnet.se</email>

</address>

</author>

</authorgroup>

<holder>Teddy Hogeborn</holder>

<holder>Björn Påhlsson</holder>

</copyright>

<xi:include href="../legalnotice.xml"/>

</refentryinfo>

<refentrytitle>&COMMANDNAME;</refentrytitle>

<manvolnum>8mandos</manvolnum>

</refmeta>

<refname><command>&COMMANDNAME;</command></refname>

<refpurpose>Prompt for a password and output it.</refpurpose>

</refnamediv>

<command>&COMMANDNAME;</command>

<arg choice="plain"><option>--prefix <replaceable

>PREFIX</replaceable></option></arg>

<arg choice="plain"><option>-p </option><replaceable

>PREFIX</replaceable></arg>

</group>

<sbr/>

<arg choice="opt"><option>--debug</option></arg>

</cmdsynopsis>

<command>&COMMANDNAME;</command>

</group>

</cmdsynopsis>

<command>&COMMANDNAME;</command>

<arg choice="plain"><option>--usage</option></arg>

</cmdsynopsis>

<command>&COMMANDNAME;</command>

<arg choice="plain"><option>--version</option></arg>

</group>

</cmdsynopsis>

</refsynopsisdiv>

<title>DESCRIPTION</title>

<para>

All <command>&COMMANDNAME;</command> does is prompt for a

password and output any given password to standard output. This

is not very useful on its own. This program is really meant to

run as a plugin in the <application>Mandos</application>

client-side system, where it is used as a fallback and

alternative to retrieving passwords from a <application

>Mandos</application> server.

</para>

<para>

This program is little more than a <citerefentry><refentrytitle

>getpass</refentrytitle><manvolnum>3</manvolnum></citerefentry>

wrapper, although actual use of that function is not guaranteed

or implied.

</para>

</refsect1>

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<title>OPTIONS</title>

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<para>

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This program is commonly not invoked from the command line; it

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is normally started by the <application>Mandos</application>

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plugin runner, see <citerefentry><refentrytitle

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>plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>

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</citerefentry>. Any command line options this program accepts

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are therefore normally provided by the plugin runner, and not

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directly.

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</para>

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<term><option>--prefix=<replaceable

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>PREFIX</replaceable></option></term>

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<term><option>-p

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<replaceable>PREFIX</replaceable></option></term>

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<para>

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Prefix string shown before the password prompt.

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</para>

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</listitem>

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</varlistentry>

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<term><option>--debug</option></term>

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<para>

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Enable debug mode. This will enable a lot of output to

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standard error about what the program is doing. The

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program will still perform all other functions normally.

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</para>

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</listitem>

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</varlistentry>

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<para>

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Gives a help message about options and their meanings.

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</para>

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</listitem>

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</varlistentry>

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<term><option>--usage</option></term>

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<para>

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Gives a short usage message.

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</para>

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</listitem>

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</varlistentry>

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<term><option>--version</option></term>

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<para>

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Prints the program version.

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</para>

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</listitem>

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</varlistentry>

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</variablelist>

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</refsect1>

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<title>EXIT STATUS</title>

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<para>

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If exit status is 0, the output from the program is the password

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as it was read. Otherwise, if exit status is other than 0, the

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program has encountered an error, and any output so far could be

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corrupt and/or truncated, and should therefore be ignored.

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</para>

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</refsect1>

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<title>ENVIRONMENT</title>

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<term><envar>cryptsource</envar></term>

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<term><envar>crypttarget</envar></term>

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<para>

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If set, these environment variables will be assumed to

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contain the source device name and the target device

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mapper name, respectively, and will be shown as part of

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the prompt.

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</para>

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<para>

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These variables will normally be inherited from

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<citerefentry><refentrytitle>plugin-runner</refentrytitle>

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<manvolnum>8mandos</manvolnum></citerefentry>, which will

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normally have inherited them from

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<filename>/scripts/local-top/cryptroot</filename> in the

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initial <acronym>RAM</acronym> disk environment, which will

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have set them from parsing kernel arguments and

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<filename>/conf/conf.d/cryptroot</filename> (also in the

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initial RAM disk environment), which in turn will have been

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created when the initial RAM disk image was created by

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<filename

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>/usr/share/initramfs-tools/hooks/cryptroot</filename>, by

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extracting the information of the root file system from

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<filename >/etc/crypttab</filename>.

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</para>

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<para>

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This behavior is meant to exactly mirror the behavior of

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<command>askpass</command>, the default password prompter.

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</para>

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</listitem>

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</varlistentry>

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</variablelist>

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</refsect1>

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<para>

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None are known at this time.

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</para>

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</refsect1>

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<title>EXAMPLE</title>

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<para>

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Note that normally, command line options will not be given

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directly, but via options for the Mandos <citerefentry

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><refentrytitle>plugin-runner</refentrytitle>

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<manvolnum>8mandos</manvolnum></citerefentry>.

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</para>

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<para>

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Normal invocation needs no options:

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</para>

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<para>

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<userinput>&COMMANDNAME;</userinput>

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</para>

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</informalexample>

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<para>

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Show a prefix before the prompt; in this case, a host name.

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It might be useful to be reminded of which host needs a

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password, in case of <acronym>KVM</acronym> switches, etc.

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</para>

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<para>

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<userinput>&COMMANDNAME; --prefix=host.example.org:</userinput>

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</para>

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</informalexample>

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<para>

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Run in debug mode.

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</para>

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<para>

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<userinput>&COMMANDNAME; --debug</userinput>

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</para>

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</informalexample>

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</refsect1>

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<title>SECURITY</title>

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<para>

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On its own, this program is very simple, and does not exactly

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present any security risks. The one thing that could be

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considered worthy of note is this: This program is meant to be

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run by <citerefentry><refentrytitle

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>plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>

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</citerefentry>, and will, when run standalone, outside, in a

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normal environment, immediately output on its standard output

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any presumably secret password it just received. Therefore,

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when running this program standalone (which should never

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normally be done), take care not to type in any real secret

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password by force of habit, since it would then immediately be

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shown as output.

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</para>

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<para>

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To further alleviate any risk of being locked out of a system,

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the <citerefentry><refentrytitle>plugin-runner</refentrytitle>

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<manvolnum>8mandos</manvolnum></citerefentry> has a fallback

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mode which does the same thing as this program, only with less

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features.

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</para>

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</refsect1>

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<para>

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<citerefentry><refentrytitle>crypttab</refentrytitle>

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<citerefentry><refentrytitle>password-request</refentrytitle>

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<manvolnum>8mandos</manvolnum></citerefentry>

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<citerefentry><refentrytitle>plugin-runner</refentrytitle>

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<manvolnum>8mandos</manvolnum></citerefentry>,

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</para>

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</refsect1>

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</refentry>

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