| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="vbox-auth">
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| 4 | <title>RDP Authentication</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>For each virtual machine that is remotely accessible using RDP, you can individually determine if and how client connections are authenticated. For this, use the <userinput>VBoxManage modifyvm</userinput> command with the <codeph>--vrde-auth-type</codeph> option. See <xref href="../cli_topics/vboxmanage-modifyvm.dita"/>. The following methods of authentication are available: </p>
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| 8 | <ul>
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| 9 | <li>
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| 10 | <p>The <b outputclass="bold">null</b> method means that there is no authentication at all. Any client can
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| 11 | connect to the VRDP server and thus the virtual machine. This is very insecure and only to be recommended for
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| 12 | private networks. </p>
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| 13 | </li>
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| 14 | <li>
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| 15 | <p>The <b outputclass="bold">external</b> method provides external authentication through a special
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| 16 | authentication library. <ph conkeyref="vbox-conkeyref-phrases/product-name"/> ships with two special
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| 17 | authentication libraries: </p>
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| 18 | <ol>
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| 19 | <li>
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| 20 | <p>The default authentication library, <userinput>VBoxAuth</userinput>, authenticates against user
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| 21 | credentials of the hosts. Depending on the host platform, this means the following: </p>
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| 22 | <ul>
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| 23 | <li>
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| 24 | <p>On Linux and Oracle Solaris hosts, <userinput>VBoxAuth.so</userinput> authenticates users against the host's PAM system. </p>
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| 25 | </li>
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| 26 | <li>
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| 27 | <p>On Windows hosts, <userinput>VBoxAuth.dll</userinput> authenticates users against the host's WinLogon
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| 28 | system. </p>
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| 29 | </li>
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| 30 | <li>
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| 31 | <p>On macOS hosts, <userinput>VBoxAuth.dylib</userinput> authenticates users against the host's
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| 32 | directory service. </p>
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| 33 | </li>
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| 34 | </ul>
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| 35 | <p>In other words, the external method by default performs authentication with the user accounts that exist
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| 36 | on the host system. Any user with valid authentication credentials is accepted. For example, the username
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| 37 | does not have to correspond to the user running the VM. </p>
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| 38 | </li>
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| 39 | <li>
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| 40 | <p>An additional library called <userinput>VBoxAuthSimple</userinput> performs authentication against
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| 41 | credentials configured in the <codeph>extradata</codeph> section of a virtual machine's XML settings file.
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| 42 | This is probably the simplest way to get authentication that does not depend on a running and supported
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| 43 | guest. The following steps are required: </p>
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| 44 | <ol>
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| 45 | <li>
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| 46 | <p>Enable <userinput>VBoxAuthSimple</userinput> with the following command: </p>
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| 47 | <pre xml:space="preserve">VBoxManage setproperty vrdeauthlibrary "VBoxAuthSimple"</pre>
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| 48 | </li>
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| 49 | <li>
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| 50 | <p>To enable the library for a particular VM, you must switch authentication to external, as follows: </p>
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| 51 | <pre xml:space="preserve">VBoxManage modifyvm <varname>VM-name</varname> --vrde-auth-type external</pre>
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| 52 | <p>Replace <varname>VM-name</varname> with the VM name or UUID. </p>
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| 53 | </li>
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| 54 | <li>
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| 55 | <p>You then need to configure users and passwords by writing items into the machine's extradata. Since
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| 56 | the XML machine settings file, into whose <codeph>extradata</codeph> section the password needs to be
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| 57 | written, is a plain text file, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> uses hashes to
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| 58 | encrypt passwords. The following command must be used: </p>
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| 59 | <pre xml:space="preserve">VBoxManage setextradata <varname>VM-name</varname> "VBoxAuthSimple/users/<varname>user</varname>" <varname>hash</varname>
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| 60 | </pre>
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| 61 | <p>Replace <varname>VM-name</varname> with the VM name or UUID, <varname>user</varname> with the user
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| 62 | name who should be allowed to log in and <varname>hash</varname> with the encrypted password. The
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| 63 | following command example obtains the hash value for the password <codeph>secret</codeph>: </p>
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| 64 | <pre xml:space="preserve">$ VBoxManage internalcommands passwordhash "secret"
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| 65 | 2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b</pre>
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| 66 | <p>You then use <userinput>VBoxManage setextradata</userinput> to store this value in the machine's
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| 67 | <codeph>extradata</codeph> section. </p>
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| 68 | <p>As a combined example, to set the password for the user <codeph>john</codeph> and the machine
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| 69 | <codeph>My VM</codeph> to <codeph>secret</codeph>, use this command: </p>
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| 70 | <pre xml:space="preserve">VBoxManage setextradata "My VM" "VBoxAuthSimple/users/john"
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| 71 | 2bb80d537b1da3e38bd30361aa855686bde0eacd7162fef6a25fe97bf527a25b</pre>
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| 72 | </li>
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| 73 | </ol>
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| 74 | </li>
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| 75 | </ol>
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| 76 | </li>
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| 77 | <li>
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| 78 | <p>The <b outputclass="bold">guest</b> authentication method performs authentication with a special component
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| 79 | that comes with the Guest Additions. As a result, authentication is not performed on the host, but with the
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| 80 | guest user accounts. </p>
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| 81 | <p>This method is currently still in testing and not yet supported. </p>
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| 82 | </li>
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| 83 | </ul>
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| 84 | <p>In addition to the methods described above, you can replace the default external authentication module with any
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| 85 | other module. For this, <ph conkeyref="vbox-conkeyref-phrases/product-name"/> provides a well-defined interface
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| 86 | that enables you to write your own authentication module. This is described in detail in the <ph
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| 87 | conkeyref="vbox-conkeyref-phrases/product-name"/> Software Development Kit (SDK) reference. See <xref
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| 88 | href="VirtualBoxAPI.dita#VirtualBoxAPI"/>. </p>
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| 89 | </body>
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| 90 |
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| 91 | </topic>
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