guacamole-client/guacamole/doc/example/user-mapping.xml

<?xml version="1.0" encoding="UTF-8"?>
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-->
<user-mapping>

    <!-- Per-user authentication and config information -->
    <authorize username="USERNAME" password="PASSWORD">
        <protocol>vnc</protocol>
        <param name="hostname">localhost</param>
        <param name="port">5900</param>
        <param name="password">VNCPASS</param>
    </authorize>

    <!-- Another user, but using md5 to hash the password
         (example below uses the md5 hash of "PASSWORD") -->
    <authorize 
            username="USERNAME2"
            password="319f4d26e3c536b5dd871bb2c52e3178"
            encoding="md5">

        <!-- First authorized connection -->
        <connection name="localhost">
            <protocol>vnc</protocol>
            <param name="hostname">localhost</param>
            <param name="port">5901</param>
            <param name="password">VNCPASS</param>
        </connection>

        <!-- Second authorized connection -->
        <connection name="otherhost">
            <protocol>vnc</protocol>
            <param name="hostname">otherhost</param>
            <param name="port">5900</param>
            <param name="password">VNCPASS</param>
        </connection>

     </authorize>

     <!-- Another user, but using SHA-256 to hash the password -->
     <authorize
            username="USERNAME3"
            password="5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8"
            encoding="sha256">

        <connection name="localhost">
            <protocol>vnc</protocol>
            <param name="hostname">localhost</param>
            <param name="port">5900</param>
            <param name="password">VNCPASS</param>
        </connection>

    </authorize>

</user-mapping>