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Viewing changes to mandos-clients.conf.xml

  • Committer: Teddy Hogeborn
  • Date: 2015-05-23 20:18:34 UTC
  • mto: This revision was merged to the branch mainline in revision 756.
  • Revision ID: teddy@recompile.se-20150523201834-e89ex4ito93yni8x
mandos: Use multiprocessing module to run checkers.

For a long time, the Mandos server has occasionally logged the message
"ERROR: Child process vanished".  This was never a fatal error, but it
has been annoying and slightly worrying, since a definite cause was
not found.  One potential cause could be the "multiprocessing" and
"subprocess" modules conflicting w.r.t. SIGCHLD.  To avoid this,
change the running of checkers from using subprocess.Popen
asynchronously to instead first create a multiprocessing.Process()
(which is asynchronous) calling a function, and have that function
then call subprocess.call() (which is synchronous).  In this way, the
only thing using any asynchronous subprocesses is the multiprocessing
module.

This makes it necessary to change one small thing in the D-Bus API,
since the subprocesses.call() function does not expose the raw wait(2)
status value.

DBUS-API (CheckerCompleted): Change the second value provided by this
                             D-Bus signal from the raw wait(2) status
                             to the actual terminating signal number.
mandos (subprocess_call_pipe): New function to be called by
                               multiprocessing.Process (starting a
                               separate process).
(Client.last_checker signal): New attribute for signal which
                              terminated last checker.  Like
                              last_checker_status, only not accessible
                              via D-Bus.
(Client.checker_callback): Take new "connection" argument and use it
                           to get returncode; set last_checker_signal.
                           Return False so gobject does not call this
                           callback again.
(Client.start_checker): Start checker using a multiprocessing.Process
                        instead of a subprocess.Popen.
(ClientDBus.checker_callback): Take new "connection" argument.        Call
                               Client.checker_callback early to have
                               it set last_checker_status and
                               last_checker_signal; use those.  Change
                               second value provided to D-Bus signal
                               CheckerCompleted to use
                               last_checker_signal if checker was
                               terminated by signal.
mandos-monitor: Update to reflect DBus API change.
(MandosClientWidget.checker_completed): Take "signal" instead of
                                        "condition" argument.  Use it
                                        accordingly.  Remove dead code
                                        (os.WCOREDUMP case).

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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY CONFNAME "mandos-clients.conf">
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<!ENTITY CONFPATH "<filename>/etc/mandos/clients.conf</filename>">
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<!ENTITY TIMESTAMP "2019-02-10">
 
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<!ENTITY TIMESTAMP "2014-06-22">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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      <year>2010</year>
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      <year>2011</year>
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      <year>2012</year>
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      <year>2013</year>
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      <year>2014</year>
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      <year>2015</year>
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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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            >--</option> %%(host)s</literal></quote>.  Note that
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            <command>mandos-keygen</command>, when generating output
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            to be inserted into this file, normally looks for an SSH
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            server on the Mandos client, and, if it finds one, outputs
 
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            server on the Mandos client, and, if it find one, outputs
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            a <option>checker</option> option to check for the
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            client’s SSH key fingerprint – this is more secure against
 
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            client’s key fingerprint – this is more secure against
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            spoofing.
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          </para>
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          <para>
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        ><replaceable>HEXSTRING</replaceable></option></term>
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        <listitem>
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          <para>
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            This option is <emphasis>required</emphasis> if the
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            <option>key_id</option> is not set, and
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            <emphasis>optional</emphasis> otherwise.
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          </para>
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          <para>
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            This option sets the OpenPGP fingerprint that (before
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            GnuTLS 3.6.0) identified the public key that clients
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            authenticate themselves with through TLS.  The string
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            needs to be in hexadecimal form, but spaces or upper/lower
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            case are not significant.
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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>key_id<literal> = </literal
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        ><replaceable>HEXSTRING</replaceable></option></term>
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        <listitem>
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          <para>
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            This option is <emphasis>required</emphasis> if the
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            <option>fingerprint</option> is not set, and
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            <emphasis>optional</emphasis> otherwise.
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          </para>
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          <para>
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            This option sets the certificate key ID that (with GnuTLS
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            3.6.6 or later) identifies the public key that clients
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            authenticate themselves with through TLS.  The string
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            needs to be in hexadecimal form, but spaces or upper/lower
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            case are not significant.
 
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            This option is <emphasis>required</emphasis>.
 
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          </para>
 
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          <para>
 
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            This option sets the OpenPGP fingerprint that identifies
 
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            the public key that clients authenticate themselves with
 
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            through TLS.  The string needs to be in hexidecimal form,
 
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            but spaces or upper/lower case are not significant.
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          </para>
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        </listitem>
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      </varlistentry>
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          <para>
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            If present, this option must be set to a string of
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            base64-encoded binary data.  It will be decoded and sent
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            to the client matching the above <option>key_id</option>
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            or <option>fingerprint</option>.  This should, of course,
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            be OpenPGP encrypted data, decryptable only by the client.
 
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            to the client matching the above
 
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            <option>fingerprint</option>.  This should, of course, be
 
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            OpenPGP encrypted data, decryptable only by the client.
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            The program <citerefentry><refentrytitle><command
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            >mandos-keygen</command></refentrytitle><manvolnum
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            >8</manvolnum></citerefentry> can, using its
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        <quote><literal>created</literal></quote>,
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        <quote><literal>enabled</literal></quote>,
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        <quote><literal>expires</literal></quote>,
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        <quote><literal>key_id</literal></quote>,
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        <quote><literal>fingerprint</literal></quote>,
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        <quote><literal>host</literal></quote>,
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        <quote><literal>interval</literal></quote>,
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      <literal>%(<replaceable>foo</replaceable>)s</literal> is
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      obscure.
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    </para>
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    <xi:include href="bugs.xml"/>
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  </refsect1>
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  <refsect1 id="example">
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# Client "foo"
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[foo]
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key_id = 788cd77115cd0bb7b2d5e0ae8496f6b48149d5e712c652076b1fd2d957ef7c1f
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fingerprint =  7788 2722 5BA7 DE53 9C5A  7CFA 59CF F7CD BD9A 5920
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secret =
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        hQIOA6QdEjBs2L/HEAf/TCyrDe5Xnm9esa+Pb/vWF9CUqfn4srzVgSu234
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# Client "bar"
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[bar]
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key_id = F90C7A81D72D1EA69A51031A91FF8885F36C8B46D155C8C58709A4C99AE9E361
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fingerprint = 3e393aeaefb84c7e89e2f547b3a107558fca3a27
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secfile = /etc/mandos/bar-secret
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timeout = PT15M