76 lines
4.1 KiB
HTML
76 lines
4.1 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>Dovecot Master User: Access user's mailbox without owner's password.</title>
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<link rel="stylesheet" type="text/css" href="./css/markdown.css" />
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</head>
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<body>
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<div id="navigation">
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<a href="https://www.iredmail.org" target="_blank">
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<img alt="iRedMail web site"
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src="./images/logo-iredmail.png"
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style="vertical-align: middle; height: 30px;"
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/>
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<span>iRedMail</span>
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</a>
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// <a href="./index.html">Document Index</a></div><h1 id="dovecot-master-user-access-users-mailbox-without-owners-password">Dovecot Master User: Access user's mailbox without owner's password.</h1>
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<p>iRedMail-0.8.6 and later releases have Dovecot Master User enabled for all
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backends (OpenLDAP, MySQL/MariaDB, PostgreSQL) by default, what you need to do
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is adding new master user.</p>
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<p>Dovecot is configured to query master user accounts from file
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<code>/etc/dovecot/dovecot-master-users</code>, you can update this file to add or remove
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master user.</p>
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<p>The format is simple:</p>
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<pre><code>username:password
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</code></pre>
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<p>You can generate a password supported by Dovecot first. for example, SSHA512.
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Let's generate password hash for our password <code>my_master_password</code>:</p>
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<pre><code># doveadm pw -s SSHA512
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Enter new password: my_master_password
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Retype new password: my_master_password
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{SSHA512}B0VHomJaMk6aLXOPglgNgJtCUA8JRnOweAwJxRW6NPWSNZ25rG/L6T05DJXH+t8WCQkemBilgkcEi6mq4Kadssivtts=
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</code></pre>
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<p>You can now pick up any username you like, for example, <code>my_master_user@not-exist.com</code>.
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Now add new master user in file
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<code>/etc/dovecot/dovecot-master-users</code> like below:</p>
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<pre><code>my_master_user@not-exist.com:{SSHA512}B0VHomJaMk6aLXOPglgNgJtCU...
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</code></pre>
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<p>Now you can access <code>user@domain.ltd</code>'s mailbox (via either IMAP or POP3
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protocol) as user <code>user@domain.ltd*my_master_user@not-exist.com</code> with password
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<code>my_master_password</code> with Roundcube webmail (it should work with other MUAs).</p>
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<p>WARNING:</p>
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<ul>
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<li>
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<p>Make sure file <code>/etc/dovecot/dovecot-master-users</code> is owned by Dovecot
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daemon user and group, with file permission <code>0500</code>, so that others cannot view
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the file content.</p>
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<ul>
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<li>on Linux/FreeBSD, Dovecot daemon user/group is <code>dovecot/dovecot</code>.</li>
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<li>on OpenBSD, Dovecot daemon user/group is <code>_dovecot/_dovecot</code>.</li>
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</ul>
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</li>
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<li>
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<p>If you don't append a (non-exist) mail domain name in Dovecot Master User
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account, Dovecot will use the domain name of your login username. For example,
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if your real user is <code>myuser@mydomain.com</code>, when you try to access this user's
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mailbox as Dovecot Master User <code>myuser@mydomain.com*my_master_user</code>, it will
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trigger Dovecot to verify user <code>my_master_user@mydomain.com</code> which doesn't
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exist on your server, then this login attempt fails.</p>
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</li>
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</ul>
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<h2 id="troubleshooting">Troubleshooting</h2>
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<p>If it doesn't work for you, please enable debug mode in Dovecot and check
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its log file. If you don't understand what the log says, please create a new
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topic in our forum and paste related log:</p>
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<ul>
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<li><a href="./debug.dovecot.html">Debug Dovecot</a></li>
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<li><a href="https://forum.iredmail.org/">iRedMail online support forum</a></li>
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</ul>
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<h2 id="references">References</h2>
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<ul>
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<li>Dovecot document: <a href="https://doc.dovecot.org/configuration_manual/authentication/master_users/">Master users/passwords</a></li>
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</ul><div class="footer">
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<p style="text-align: center; color: grey;">All documents are available in <a href="https://github.com/iredmail/docs/">GitHub repository</a>, and published under <a href="http://creativecommons.org/licenses/by-nd/3.0/us/" target="_blank">Creative Commons</a> license. You can <a href="https://github.com/iredmail/docs/archive/master.zip">download the latest version</a> for offline reading. If you found something wrong, please do <a href="https://www.iredmail.org/contact.html">contact us</a> to fix it.</p>
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</div></body></html> |