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<?php
// Copyright © 2021 Adam Spragg
//
// This file is part of emailautoconf
//
// emailautoconf is free software: you can redistribute it and/or modify
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// emailautoconf is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with emailautoconf. If not, see
// <https://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: LGPL-3.0-or-later
// Outlook autoconfiguration described at:
// https://docs.microsoft.com/en-us/previous-versions/office/office-2010/cc511507(v=office.14)
//
// Should be installed at:
// https://[domain]/autodiscover/autodiscover.xml
// https://autodiscover.[domain]/autodiscover/autodiscover.xml
if ($_SERVER['REQUEST_URI'] == "/autodiscover/autodiscover.xml"
&& preg_match('/^autodiscover\.(.*)$/', $_SERVER['HTTP_HOST'], $matches))
{
$domain = $matches[1];
}
else if ($_SERVER['REQUEST_URI'] == "/autodiscover/autodiscover.xml") {
$domain = $_SERVER['HTTP_HOST'];
}
else {
http_response_code(500);
header('Content-Type: text/plain');
echo "Unable to determine email domain from //".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
exit(1);
}
$IMAP = dns_get_record("_imaps._tcp.".$domain, DNS_SRV)
?: dns_get_record("_imap._tcp.".$domain, DNS_SRV);
$SMTP = dns_get_record("_submission._tcp.".$domain, DNS_SRV);
if (!$IMAP || !$SMTP) {
http_response_code(500);
header('Content-Type: text/plain');
if (!$IMAP) {
echo "Missing/unavailable IMAP(S) SRV record for ".$domain;
}
if (!$SMTP) {
echo "Missing/unavailable Submission SRV record for ".$domain;
}
exit(1);
}
$sitename = getenv("EMAIL_SITENAME") ?: $domain;
$shortname = getenv("EMAIL_SHORTNAME") ?: $sitename;
if (($xml = simplexml_load_string(file_get_contents('php://input'))) != false
&& $xml->registerXPathNamespace('a',
'http://schemas.microsoft.com/exchange/autodiscover/outlook/requestschema/2006')
&& ($emails = $xml->xpath("/a:Autodiscover/a:Request/a:EMailAddress")) != false
&& $emails != null
&& count($emails) == 1
&& preg_match("/^([^@]*)@([^@]*)$/", $emails[0], $parts))
{
$login = $parts[1];
}
else {
$login = "";
}
header('Content-Type: application/xml');
?>
<?xml version="1.0"?>
<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006">
<Response xmlns="http://schemas.microsoft.com/exchange/autodiscover/outlook/responseschema/2006a">
<User>
<DisplayName><?= htmlspecialchars($sitename, ENT_XML1) ?></DisplayName>
</User>
<Account>
<AccountType>email</AccountType>
<Action>settings</Action>
<?php foreach ($IMAP as $srv) { ?>
<Protocol>
<Type>IMAP</Type>
<Server><?= htmlspecialchars($srv['target'], ENT_XML1) ?></Server>
<Port><?= htmlspecialchars($srv['port'], ENT_XML1) ?></Port>
<DomainRequired>off</DomainRequired>
<SPA>off</SPA>
<SSL>on</SSL>
<AuthRequired>on</AuthRequired>
<LoginName><?= htmlspecialchars($login, ENT_XML1) ?></LoginName>
</Protocol>
<?php } ?>
<?php foreach ($SMTP as $srv) { ?>
<Protocol>
<Type>SMTP</Type>
<Server><?= htmlspecialchars($srv['target'], ENT_XML1) ?></Server>
<Port><?= htmlspecialchars($srv['port'], ENT_XML1) ?></Port>
<DomainRequired>off</DomainRequired>
<SPA>off</SPA>
<SSL>on</SSL>
<AuthRequired>on</AuthRequired>
<LoginName><?= htmlspecialchars($login, ENT_XML1) ?></LoginName>
</Protocol>
<?php } ?>
</Account>
</Response>
</Autodiscover>
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