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46
<refname><command>&COMMANDNAME;</command></refname>
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Passprompt for luks during boot sequence
47
<refpurpose>Prompt for a password and output it.</refpurpose>
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52
<command>&COMMANDNAME;</command>
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<arg choice='opt'>--prefix<arg choice='plain'>PREFIX</arg></arg>
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<arg choice='opt'>--debug</arg>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--help</arg>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--usage</arg>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--version</arg>
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<arg choice="plain"><option>--prefix <replaceable
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>PREFIX</replaceable></option></arg>
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<arg choice="plain"><option>-p </option><replaceable
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>PREFIX</replaceable></arg>
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<arg choice="opt"><option>--debug</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--help</option></arg>
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<arg choice="plain"><option>-?</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--usage</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--version</option></arg>
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<arg choice="plain"><option>-V</option></arg>
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<refsect1 id="description">
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<title>DESCRIPTION</title>
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<command>&COMMANDNAME;</command> is a terminal program that ask for
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passwords during boot sequence. It is a plugin to
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<firstterm>mandos</firstterm>, and is used as a fallback and
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alternative to retriving passwords from a mandos server. During
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boot sequence the user is prompted for the disk password, and
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when a password is given it then gets forwarded to
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<acronym>LUKS</acronym>.
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All <command>&COMMANDNAME;</command> does is prompt for a
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password and output any given password to standard output. This
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is not very useful on its own. This program is really meant to
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run as a plugin in the <application>Mandos</application>
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client-side system, where it is used as a fallback and
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alternative to retriving passwords from a <application
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>Mandos</application> server.
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This program is little more than a <citerefentry><refentrytitle
95
>getpass</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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wrapper, although actual use of that function is not guaranteed
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<refsect1 id="options">
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102
<title>OPTIONS</title>
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Commonly not invoked as command lines but from configuration
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file of plugin runner.
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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
107
>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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<term><literal>-p</literal>, <literal>--prefix=<replaceable>PREFIX
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</replaceable></literal></term>
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Prefix used before the passprompt
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<term><literal>--debug</literal></term>
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<term><literal>-?</literal>, <literal>--help</literal></term>
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<term><literal>--usage</literal></term>
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Gives a short usage message
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<term><literal>-V</literal>, <literal>--version</literal></term>
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Prints the program version
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<term><option>--prefix=<replaceable
116
>PREFIX</replaceable></option></term>
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<replaceable>PREFIX</replaceable></option></term>
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Prefix string shown before the password prompt.
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<term><option>--debug</option></term>
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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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<term><option>--help</option></term>
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<term><option>-?</option></term>
142
Gives a help message about options and their meanings.
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<term><option>--usage</option></term>
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Gives a short usage message.
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<term><option>--version</option></term>
158
<term><option>-V</option></term>
161
Prints the program version.
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<refsect1 id="exit_status">
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<title>EXIT STATUS</title>
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If exit status is 0, the output from the program is the password
172
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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<refsect1 id="environment">
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<title>ENVIRONMENT</title>
174
<refsect1 id="files">
182
<term><envar>cryptsource</envar></term>
183
<term><envar>crypttarget</envar></term>
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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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These variables will normally be inherited from
193
<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 RAM disk environment, which will have set them from
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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
203
>/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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This behavior is meant to exactly mirror the behavior of
209
<command>askpass</command>, the default password prompter.
180
216
<refsect1 id="bugs">
181
217
<title>BUGS</title>
219
None are known at this time.
186
223
<refsect1 id="example">
187
224
<title>EXAMPLE</title>
226
Note that normally, command line options will not be given
227
directly, but via options for the Mandos <citerefentry
228
><refentrytitle>plugin-runner</refentrytitle>
229
<manvolnum>8mandos</manvolnum></citerefentry>.
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Normal invocation needs no options:
236
<userinput>&COMMANDNAME;</userinput>
241
Show a prefix before the prompt; in this case, a host name.
242
It might be useful to be reminded of which host needs a
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password, in case of KVM switches, etc.
247
<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --prefix=host.example.org:</userinput>
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<!-- do not wrap this line -->
258
<userinput>&COMMANDNAME; --debug</userinput>
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263
<refsect1 id="security">
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264
<title>SECURITY</title>
266
On its own, this program is very simple, and does not exactly
267
present any security risks. The one thing that could be
268
considered worthy of note is this: This program is meant to be
269
run by <citerefentry><refentrytitle
270
>plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>
271
</citerefentry>, and will, when run standalone, outside, in a
272
normal environment, immediately output on its standard output
273
any presumably secret password it just recieved. Therefore,
274
when running this program standalone (which should never
275
normally be done), take care not to type in any real secret
276
password by force of habit, since it would then immediately be
280
To further alleviate any risk of being locked out of a system,
281
the <citerefentry><refentrytitle>plugin-runner</refentrytitle>
282
<manvolnum>8mandos</manvolnum></citerefentry> has a fallback
283
mode which does the same thing as this program, only with less
198
288
<refsect1 id="see_also">
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289
<title>SEE ALSO</title>
201
<citerefentry><refentrytitle>mandos</refentrytitle>
202
<manvolnum>8</manvolnum></citerefentry>, <citerefentry>
203
<refentrytitle>plugin-runner</refentrytitle>
204
<manvolnum>8mandos</manvolnum></citerefentry> and <citerefentry>
205
<refentrytitle>password-request</refentrytitle>
291
<citerefentry><refentrytitle>crypttab</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>
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<citerefentry><refentrytitle>password-request</refentrytitle>
206
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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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