<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">This is turning into a bigger job than I imagined. "Give a mouse a cookie", and all that.<div class=""><br class=""></div><div class="">The ovms_server.pl has gotten horrendous over the years. Almost 3,000 monolithic lines of code, 4 server listeners, three different types of server, push notifications, database synchronisation, etc. I tried turning on ‘use strict’ and it showed up a bunch of bugs and errors.</div><div class=""><br class=""></div><div class="">So, I am refactoring it to a plugin architecture. That should make it more maintainable, and also provide a foundation for it to work better with the v3 MQTT. I suggest people hold off from making any changes to the server code in the next few days.</div><div class=""><br class=""></div><div class="">Regards, Mark<br class=""><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On 21 Feb 2020, at 9:48 PM, Mark Webb-Johnson <<a href="mailto:mark@webb-johnson.net" class="">mark@webb-johnson.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class=""><div dir="ltr" class="">Ok. I will rework a modular approach. Should be able to get this done over the weekend.</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">Yes, strict and warn would help.</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">Mark</div><div dir="ltr" class=""><br class=""></div><div dir="ltr" class="">P.S. Explains why nobody used the http api on my server :-)</div><div dir="ltr" class=""><br class=""><blockquote type="cite" class="">On 21 Feb 2020, at 9:35 PM, Michael Balzer <<a href="mailto:dexter@expeedo.de" class="">dexter@expeedo.de</a>> wrote:<br class=""><br class=""></blockquote></div><blockquote type="cite" class=""><div dir="ltr" class="">
  
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
  
  
    Thanks Mark,<br class="">
    <br class="">
    I must have been blind… but perl also never fails to amaze me in
    terms of "compiles fine, but won't run" -- $ph isn't defined
    anywhere else. Maybe "strict" mode would have told me about that.<br class="">
    <br class="">
    And I didn't think about meta data in the hash. You're right, we
    need to pass both values to the function. And I need to rework my
    password hashing…<br class="">
    <br class="">
    A modular solution seems to be best, easy to add custom
    implementations and to provide some standard modules.<br class="">
    <br class="">
    Regards,<br class="">
    Michael<br class="">
    <br class="">
    <br class="">
    <div class="moz-cite-prefix">Am 21.02.20 um 12:15 schrieb Mark
      Webb-Johnson:<br class="">
    </div>
    <blockquote type="cite" cite="mid:F4FAF182-04FF-4255-AAB6-6D7C1F9F565B@webb-johnson.net" class="">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
      <div class=""><br class="">
      </div>
      An alternative would be to implement a server authentication
      module, and to ‘require’ that into the system at startup:
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class=""><br class="">
        require $config->val('db',’pw_module’,’auth_none.pl’);</blockquote>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class=""><br class="">
      </blockquote>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class="">…</blockquote>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class=""><br class="">
      </blockquote>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class="">If (&auth_password_check($passwordhash,
        $password))</blockquote>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class="">  ...</blockquote>
      <div class="">
        <div class=""><br class="">
        </div>
        <div class="">Provide a ‘auto_none.pl’:</div>
        <div class=""><br class="">
        </div>
      </div>
      <blockquote style="margin: 0 0 0 40px; border: none; padding:
        0px;" class="">
        <div class="">
          <div class="">#!/usr/bin/perl</div>
        </div>
        <div class=""><br class="">
        </div>
        <div class="">sub auth_password_check</div>
        <div class="">  {</div>
        <div class="">  my ($hash,$password) = @_;</div>
        <div class=""><br class="">
        </div>
        <div class="">  return 0;</div>
        <div class="">  }</div>
      </blockquote>
      <div class="">
        <div class=""><br class="">
        </div>
        <div class="">Then a ‘auth_drupal7.pl’, ‘auth_sha1.pl’, etc.</div>
        <div class=""><br class="">
        </div>
        <div class="">This could also be done in a perl modular fashion by having
          the module provided as an object (using ‘use …’). Probably
          cleaner than the old-style require.</div>
        <div class=""><br class="">
        </div>
        <div class="">That is much more extendable and standardised. In
          particular, there is also code that syncs Drupal users to
          ovms_owners (svr_tim) and if we have a separate module that
          drupal-dependant code could be removed from ovms_server.pl.</div>
        <div class=""><br class="">
        </div>
        <div class="">Is that a better solution?</div>
        <div class=""><br class="">
        </div>
        <div class="">Regards, Mark.</div>
        <div class=""><br class="">
          <blockquote type="cite" class="">
            <div class="">On 21 Feb 2020, at 11:37 AM, Mark Webb-Johnson
              <<a href="mailto:mark@webb-johnson.net" class="" moz-do-not-send="true">mark@webb-johnson.net</a>>
              wrote:</div>
            <br class="Apple-interchange-newline">
            <div class="">
              <meta http-equiv="Content-Type" content="text/html;
                charset=UTF-8" class="">
              <div style="word-wrap: break-word; -webkit-nbsp-mode:
                space; line-break: after-white-space;" class="">Michael,
                <div class=""><br class="">
                </div>
                <div class="">Just before your commit, the server code
                  was:</div>
                <div class=""><br class="">
                </div>
                <blockquote style="margin: 0 0 0 40px; border: none;
                  padding: 0px;" class="">
                  <div class="">
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">my $passwordhash = $row->{'pass'};</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">if
                          (&drupal_password_check($passwordhash,
                          $password))</span></font></div>
                  </div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">…</span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class="">
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">sub drupal_password_check</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  {</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my ($ph,$password) = @_;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $iter_log2 =
                          index($itoa64,substr($ph,3,1));</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $iter_count = 1 <<
                          $iter_log2;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $phash = substr($ph,0,12);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $salt = substr($ph,4,8);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $hash = sha512($salt.$password);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  do</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    {</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    $hash = sha512($hash.$password);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    $iter_count--;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    } while ($iter_count > 0);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $encoded = substr($phash .
                          &drupal_password_base64_encode($hash,length($hash)),0,55);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  return ($encoded eq $ph);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  }</span></font></div>
                  </div>
                </blockquote>
                <div class=""><br class="">
                </div>
                <div class="">Your change was:</div>
                <div class=""><br class="">
                </div>
                <blockquote style="margin: 0 0 0 40px; border: none;
                  padding: 0px;" class="">
                  <div class="">
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""># User password encoding function:</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">my $pw_encode        =
                          $config->val('db','pw_encode','drupal_password($password)’);</span></font></div>
                  </div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">…</span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class="">
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">my $passwordhash = $row->{'pass'};</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">my $encoded = eval $pw_encode;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">if ($encoded eq $passwordhash)</span></font></div>
                  </div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">…</span></font></div>
                  <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                      </span></font></div>
                  <div class="">
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">sub drupal_password</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  {</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my ($password) = @_;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $iter_log2 =
                          index($itoa64,substr($ph,3,1));</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $iter_count = 1 <<
                          $iter_log2;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $phash = substr($ph,0,12);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $salt = substr($ph,4,8);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $hash = sha512($salt.$password);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  do</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    {</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    $hash = sha512($hash.$password);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    $iter_count--;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">    } while ($iter_count > 0);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  my $encoded = substr($phash .
                          &drupal_password_base64_encode($hash,length($hash)),0,55);</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class=""><br class="">
                        </span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  return $encoded;</span></font></div>
                    <div class=""><font class="" face="Andale Mono"><span style="font-style: normal; font-size: 14px;" class="">  }</span></font></div>
                  </div>
                </blockquote>
                <div class="">
                  <div class=""><br class="">
                  </div>
                  <div class="">You changed the parameters from
                    ($ph,$password) to just ($password), but the
                    drupal_password function still needs to use $ph (the
                    hash) to extract meta data to set the encoding
                    parameters.</div>
                  <div class=""><br class="">
                  </div>
                  <div class="">The problem is that Drupal (and others)
                    has a strong hashing function with multiple
                    iterations. The meta data for that is stored in the
                    password hash itself. The unix crypt library does
                    something similar (with the encoding method and salt
                    stored as meta data in the hash). Just storing
                    passwords as straight hashes (md5, sha1, etc) is
                    fundamentally not secure, as it is trivial to use
                    rainbow tables to break the hashes - so most modern
                    systems use iterations, salts, or other techniques
                    to limit the effectiveness of rainbow tables and
                    make brute force approaches computationally
                    unfeasible.</div>
                  <div class=""><br class="">
                  </div>
                  <div class="">For many systems, we can only encode a
                    password in the same way as a previous encoding if
                    we know the meta data of the previous encoding (and
                    that is stored in the hash). Hence we need the hash
                    as a parameter, to extract the meta data to be able
                    to encode the new password in the same way.</div>
                  <div class=""><br class="">
                  </div>
                  <div class="">This won’t just affect drupal, but any
                    system with a non-trivial password hashing function.</div>
                  <div class=""><br class="">
                  </div>
                  <div class="">So, pw_encode() needs both the old hash
                    as well as the plaintext password to encode. At
                    which point, I think it becomes easier to make it
                    simply pw_check() returning a boolean. It also seems
                    easier to me to do that as a plugin function
                    (pw_check vs pw_encode) as it will allow other
                    non-trivial hashing comparisons if required. For
                    example, say you needed to check the password
                    against an external lookup (ldap, etc).</div>
                  <div class=""><br class="">
                  </div>
                  <div class="">Regards, Mark.</div>
                  <div class=""><br class="">
                    <blockquote type="cite" class="">
                      <div class="">On 21 Feb 2020, at 1:12 AM, Michael
                        Balzer <<a href="mailto:dexter@expeedo.de" class="" moz-do-not-send="true">dexter@expeedo.de</a>>
                        wrote:</div>
                      <br class="Apple-interchange-newline">
                      <div class="">
                        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
                        <div class=""> Mark,<br class="">
                          <br class="">
                          I did 1b73a7f8 to split the "create &
                          compare password" function into separate
                          "create" & "compare" steps, and introduced
                          the "pw_encode" config hook to be able to
                          supply just a custom "create" operation. That
                          simplifies the config (see example).<br class="">
                          <br class="">
                          That change has been working since 2016 on my
                          server. I see you reintroduced the "create
                          & compare" function as a separate function
                          for the MQTT auth, but don't see why that was
                          needed. I also don't see why the separated
                          function was broken on your server. Can you
                          please elaborate? I'd like to understand what
                          was going wrong.<br class="">
                          <br class="">
                          With reverting to the "create & compare",
                          this breaks the configuration of servers not
                          using Drupal. Essentially, the new "pw_check"
                          hook does just the previous "pw_encode" and
                          adds the comparison to that, so I'd rather opt
                          for adding a default function here that simply
                          reuses the existing "pw_encode" hook.<br class="">
                          <br class="">
                          Regards,<br class="">
                          Michael<br class="">
                          <br class="">
                          <br class="">
                          <div class="moz-cite-prefix">Am 20.02.20 um
                            04:09 schrieb Mark Webb-Johnson:<br class="">
                          </div>
                          <blockquote type="cite" cite="mid:F48FF6EE-9CB9-4DB5-8106-BE4CD73C5AE3@webb-johnson.net" class="">
                            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
                            Even stranger. This conversation obviously
                            triggered someone to try it and then raise a
                            support ticket that HTTP API authentication
                            didn’t work.
                            <div class=""><br class="">
                            </div>
                            <div class="">It seems  a change was made
                              back in 2016-02-01 23:59:22 (1b73a7f8)
                              that broke the pw_encode function
                              (drupal_password). It was also weird
                              because we had drupal_password and
                              drupal_password_check functions, doing
                              pretty much the same thing (one used by
                              HTTP API and the other by MQ
                              authentication).</div>
                            <div class=""><br class="">
                            </div>
                            <div class="">I standardised to use a new
                              pw_check (overridable in the config)
                              parameter, which defaults to:</div>
                            <div class=""><br class="">
                            </div>
                            <blockquote style="margin: 0 0 0 40px;
                              border: none; padding: 0px;" class="">
                              <div class=""><font class="" face="Andale
                                  Mono"><span style="font-style: normal;
                                    font-size: 14px;" class="">drupal_password_check($passwordhash,$password)</span></font></div>
                            </blockquote>
                            <div class="">
                              <div class=""><br class="">
                              </div>
                              <div class="">and stopped using the
                                pw_encode config value. I also changed
                                the MQ authentication stuff to use the
                                same pw_check parameter (so both
                                authentication uses are now able to be
                                changed in the same config). If using
                                something other than drupal, just need
                                to change the pw_check parameter in the
                                config.</div>
                              <div class=""><br class="">
                              </div>
                              <div class="">I realise that this may
                                break other users of the server, but it
                                doesn’t seem a difficult fix to make,
                                and is a much better approach.</div>
                              <div class=""><br class="">
                              </div>
                              <div class="">Regards, Mark</div>
                              <div class=""><br class="">
                                <blockquote type="cite" class="">
                                  <div class="">On 19 Feb 2020, at 1:53
                                    PM, Mark Webb-Johnson <<a href="mailto:mark@webb-johnson.net" class="" moz-do-not-send="true">mark@webb-johnson.net</a>>
                                    wrote:</div>
                                  <br class="Apple-interchange-newline">
                                  <div class="">
                                    <div class="">Strange. I have zero
                                      using mine. Must be a EU thing?<br class="">
                                      <br class="">
                                      I’ll keep it in mind and try not
                                      to break anything.<br class="">
                                      <br class="">
                                      Regards, Mark.<br class="">
                                      <br class="">
                                      <blockquote type="cite" class="">On
                                        18 Feb 2020, at 8:41 PM, Michael
                                        Balzer <<a href="mailto:dexter@expeedo.de" class="" moz-do-not-send="true">dexter@expeedo.de</a>>
                                        wrote:<br class="">
                                        <br class="">
                                        Mark,<br class="">
                                        <br class="">
                                        grep "main: http" in the log:
                                        yes, I've got some users
                                        accessing the API frequently.<br class="">
                                        <br class="">
                                        Usage is mostly /api/charge
                                        followed by /api/status &
                                        /api/historical, but almost all
                                        calls have been used during the
                                        last days.<br class="">
                                        <br class="">
                                        Regards,<br class="">
                                        Michael<br class="">
                                        <br class="">
                                        <br class="">
                                        Am 18.02.20 um 04:28 schrieb
                                        Mark Webb-Johnson:<br class="">
                                        <blockquote type="cite" class="">Is
                                          anyone here using the HTTP API
                                          at all?<br class="">
                                          <br class="">
                                          It seems so tied to the v2
                                          protocol, as to not be much
                                          use.<br class="">
                                          <br class="">
                                          Regards, Mark.<br class="">
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                                        </blockquote>
                                        <br class="">
                                        <br class="">
                                        -- <br class="">
                                        Michael Balzer * Helkenberger
                                        Weg 9 * D-58256 Ennepetal<br class="">
                                        Fon 02333 / 833 5735 * Handy
                                        0176 / 206 989 26<br class="">
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                          <pre class="moz-signature" cols="160">-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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    <pre class="moz-signature" cols="160">-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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