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  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • mto: This revision was merged to the branch mainline in revision 412.
  • Revision ID: teddy@recompile.se-20241117165300-02hxm96s8cj9528e
mandos: Avoid closing configured server network socket

If we are passed a pre-created created network socket as a file
descriptor, we must avoid later closing it (when stdin, stdout and
stderr are dup2()ed over with /dev/null) by making sure that the
network file descriptor is not 0, 1, or 2, by creating a new file
descriptor if necessary.

However, when we create a new file descriptor we must check that the
new file descriptor is not 0, 1, or 2 either, and try again until we
get a suitable file descriptor.

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plugins.d/password-prompt.xml
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY COMMANDNAME "password-prompt">
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<!ENTITY TIMESTAMP "2018-02-08">
 
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<!ENTITY TIMESTAMP "2019-07-27">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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      <year>2016</year>
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      <year>2017</year>
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      <year>2018</year>
 
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      <year>2019</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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        >PREFIX</replaceable></arg>
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      </group>
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      <sbr/>
 
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      <arg choice="opt">
 
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        <option>--prompt <replaceable>PROMPT</replaceable></option>
 
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      </arg>
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      <arg choice="opt"><option>--debug</option></arg>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      wrapper, although actual use of that function is not guaranteed
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      or implied.
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    </para>
 
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    <para>
 
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      This program tries to detect if a Plymouth daemon
 
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      (<citerefentry><refentrytitle
 
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      >plymouthd</refentrytitle><manvolnum>8</manvolnum></citerefentry>)
 
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      is running, by looking for a
 
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      <filename>/run/plymouth/pid</filename> file or a process named
 
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      <quote><literal>plymouthd</literal></quote>.  If it is detected,
 
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      this process will immediately exit without doing anything.
 
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    </para>
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  </refsect1>
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  <refsect1 id="options">
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      </varlistentry>
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      <varlistentry>
 
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        <term><option>--prompt=<replaceable
 
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        >PROMPT</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            The password prompt.  Using this option will make this
 
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            program ignore the <envar>CRYPTTAB_SOURCE</envar> and
 
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            <envar>CRYPTTAB_NAME</envar> environment variables.
 
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          </para>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
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        <term><option>--debug</option></term>
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        <listitem>
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          <para>
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        <term><envar>CRYPTTAB_NAME</envar></term>
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        <listitem>
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          <para>
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            If set, these environment variables will be assumed to
 
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            If set, and if the <option>--prompt</option> option is not
 
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            used, 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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          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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          <manvolnum>8mandos</manvolnum></citerefentry>, which might
 
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          have in turn inherited them from its calling process.
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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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          <command>askpass</command>, the default password prompter
 
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          from initramfs-tools.
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        </para>
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        </listitem>
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      </varlistentry>
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    <title>SEE ALSO</title>
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    <para>
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      <citerefentry><refentrytitle>intro</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>
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      <citerefentry><refentrytitle>crypttab</refentrytitle>
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      <manvolnum>5</manvolnum></citerefentry>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>mandos-client</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>
 
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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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      <citerefentry><refentrytitle>plymouthd</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry>
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    </para>
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  </refsect1>
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</refentry>