openstack-manuals/doc/common/section_trusted-compute-pools.xml

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    xml:id="trusted-compute-pools">
    <title>Trusted compute pools</title>
    <para>Trusted compute pools enable administrators to designate a
        group of compute hosts as trusted. These hosts use hardware-based
        security features, such as the Intel Trusted Execution
        Technology (TXT), to provide an additional level of security.
        Combined with an external stand-alone web-based remote
        attestation server, cloud providers can ensure that the
        compute node runs only software with verified measurements and
        can ensure a secure cloud stack.</para>
    <para>Through the trusted compute pools, cloud subscribers can
        request services to run on verified compute nodes.</para>
    <para>The remote attestation server performs node verification as
        follows:</para>
    <orderedlist>
        <listitem>
            <para>Compute nodes boot with Intel TXT technology
                enabled.</para>
        </listitem>
        <listitem>
            <para>The compute node BIOS, hypervisor, and OS are
                measured.</para>
        </listitem>
        <listitem>
            <para>Measured data is sent to the attestation server when
                challenged by attestation server.</para>
        </listitem>
        <listitem>
            <para>The attestation server verifies those measurements
                against a good and known database to determine nodes'
                trustworthiness.</para>
        </listitem>
    </orderedlist>
    <para>A description of how to set up an attestation service is
        beyond the scope of this document. For an open source project
        that you can use to implement an attestation service, see the
            <link
            xlink:href="https://github.com/OpenAttestation/OpenAttestation"
            >Open Attestation</link> project.</para>
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    <section xml:id="configure_trusted_compute_pools">
        <title>Configure Compute to use trusted compute pools</title>
        <procedure>
            <step>
                <para>Configure the Compute service with the
                    connection information for the attestation
                    service.</para>
                <para>Specify these connection options in the
                        <literal>trusted_computing</literal> section
                    in the <filename>nova.conf</filename>
                    configuration file:</para>
                <variablelist>
                    <varlistentry>
                        <term>server</term>
                        <listitem>
                            <para>Host name or IP address of the host
                                that runs the attestation
                                service</para>
                        </listitem>
                    </varlistentry>
                    <varlistentry>
                        <term>port</term>
                        <listitem>
                            <para>HTTPS port for the attestation
                                service</para>
                        </listitem>
                    </varlistentry>
                    <varlistentry>
                        <term>server_ca_file</term>
                        <listitem>
                            <para>Certificate file used to verify the
                                attestation server's identity.</para>
                        </listitem>
                    </varlistentry>
                    <varlistentry>
                        <term>api_url</term>
                        <listitem>
                            <para>The attestation service URL
                                path.</para>
                        </listitem>
                    </varlistentry>
                    <varlistentry>
                        <term>auth_blob</term>
                        <listitem>
                            <para>An authentication blob, which is
                                required by the attestation
                                service.</para>
                        </listitem>
                    </varlistentry>
                </variablelist>
            </step>
            <step>
                <para>To enable scheduling support for trusted compute
                    pools, add the following lines to the
                        <literal>DEFAULT</literal> and
                        <literal>trusted_computing</literal> sections
                    in the <filename>/etc/nova/nova.conf</filename>
                    file. Edit the details in the
                        <literal>trusted_computing</literal> section
                    based on the details of your attestation
                    service:</para>
                <programlisting language="ini">[DEFAULT]
compute_scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler
scheduler_available_filters=nova.scheduler.filters.all_filters
scheduler_default_filters=AvailabilityZoneFilter,RamFilter,ComputeFilter,TrustedFilter

[trusted_computing]
server=10.1.71.206
port=8443
server_ca_file=/etc/nova/ssl.10.1.71.206.crt
# If using OAT v1.5, use this api_url:
api_url=/AttestationService/resources
# If using OAT pre-v1.5, use this api_url:
#api_url=/OpenAttestationWebServices/V1.0
auth_blob=i-am-openstack</programlisting>
            </step>
            <step>
                <para>Restart the <systemitem class="service"
                        >nova-compute</systemitem> and <systemitem
                        class="service">nova-scheduler</systemitem>
                    services.</para>
            </step>
        </procedure>
        <section xml:id="config_ref">
            <title>Configuration reference</title>
            <para>To customize the trusted compute pools, use the configuration
                option settings documented in <xref
                    linkend="config_table_nova_trustedcomputing"/>.</para>
        </section>
    </section>
    <section xml:id="trusted_flavors">
        <title>Specify trusted flavors</title>
        <para>You must configure one or more flavors as
                trusted. Users can request
            trusted nodes by specifying a trusted flavor when they
            boot an instance.</para>
        <para>Use the <command>nova flavor-key set</command> command
            to set a flavor as trusted. For example, to set the
                <literal>m1.tiny</literal> flavor as trusted:</para>
        <screen><prompt>$</prompt> <userinput>nova flavor-key m1.tiny set trust:trusted_host trusted</userinput></screen>
        <para>To request that their instances run on a trusted host,
            users can specify a trusted flavor on the <command>nova
                boot</command> command:</para>
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