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<section id="chip-card-interface-device-ccid">
<h1>Chip Card Interface Device (CCID)<a class="headerlink" href="#chip-card-interface-device-ccid" title="Link to this heading"></a></h1>
<section id="usb-ccid-device">
<h2>USB CCID device<a class="headerlink" href="#usb-ccid-device" title="Link to this heading"></a></h2>
<p>The USB CCID device is a USB device implementing the CCID specification, which
lets one connect smart card readers that implement the same spec. For more
information see the specification:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Universal</span> <span class="n">Serial</span> <span class="n">Bus</span>
<span class="n">Device</span> <span class="n">Class</span><span class="p">:</span> <span class="n">Smart</span> <span class="n">Card</span>
<span class="n">CCID</span>
<span class="n">Specification</span> <span class="k">for</span>
<span class="n">Integrated</span> <span class="n">Circuit</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="n">Cards</span> <span class="n">Interface</span> <span class="n">Devices</span>
<span class="n">Revision</span> <span class="mf">1.1</span>
<span class="n">April</span> <span class="mi">22</span><span class="n">rd</span><span class="p">,</span> <span class="mi">2005</span>
</pre></div>
</div>
<p>Smartcards are used for authentication, single sign on, decryption in
public/private schemes and digital signatures. A smartcard reader on the client
cannot be used on a guest with simple usb passthrough since it will then not be
available on the client, possibly locking the computer when it is “removed”. On
the other hand this device can let you use the smartcard on both the client and
the guest machine. It is also possible to have a completely virtual smart card
reader and smart card (i.e. not backed by a physical device) using this device.</p>
</section>
<section id="building">
<h2>Building<a class="headerlink" href="#building" title="Link to this heading"></a></h2>
<p>The cryptographic functions and access to the physical card is done via the
libcacard library, whose development package must be installed prior to
building QEMU:</p>
<p>In redhat/fedora:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">yum</span> <span class="n">install</span> <span class="n">libcacard</span><span class="o">-</span><span class="n">devel</span>
</pre></div>
</div>
<p>In ubuntu:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">apt</span><span class="o">-</span><span class="n">get</span> <span class="n">install</span> <span class="n">libcacard</span><span class="o">-</span><span class="n">dev</span>
</pre></div>
</div>
<p>Configuring and building:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">./</span><span class="n">configure</span> <span class="o">--</span><span class="n">enable</span><span class="o">-</span><span class="n">smartcard</span> <span class="o">&amp;&amp;</span> <span class="n">make</span>
</pre></div>
</div>
</section>
<section id="using-ccid-card-emulated-with-hardware">
<h2>Using ccid-card-emulated with hardware<a class="headerlink" href="#using-ccid-card-emulated-with-hardware" title="Link to this heading"></a></h2>
<p>Assuming you have a working smartcard on the host with the current
user, using libcacard, QEMU acts as another client using ccid-card-emulated:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span> <span class="o">-</span><span class="n">usb</span> <span class="o">-</span><span class="n">device</span> <span class="n">usb</span><span class="o">-</span><span class="n">ccid</span> <span class="o">-</span><span class="n">device</span> <span class="n">ccid</span><span class="o">-</span><span class="n">card</span><span class="o">-</span><span class="n">emulated</span>
</pre></div>
</div>
</section>
<section id="using-ccid-card-emulated-with-certificates-stored-in-files">
<h2>Using ccid-card-emulated with certificates stored in files<a class="headerlink" href="#using-ccid-card-emulated-with-certificates-stored-in-files" title="Link to this heading"></a></h2>
<p>You must create the CA and card certificates. This is a one time process.
We use NSS certificates:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>mkdir fake-smartcard
cd fake-smartcard
certutil -N -d sql:$PWD
certutil -S -d sql:$PWD -s &quot;CN=Fake Smart Card CA&quot; -x -t TC,TC,TC -n fake-smartcard-ca
certutil -S -d sql:$PWD -t ,, -s &quot;CN=John Doe&quot; -n id-cert -c fake-smartcard-ca
certutil -S -d sql:$PWD -t ,, -s &quot;CN=John Doe (signing)&quot; --nsCertType smime -n signing-cert -c fake-smartcard-ca
certutil -S -d sql:$PWD -t ,, -s &quot;CN=John Doe (encryption)&quot; --nsCertType sslClient -n encryption-cert -c fake-smartcard-ca
</pre></div>
</div>
<p>Note: you must have exactly three certificates.</p>
<p>You can use the emulated card type with the certificates backend:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>qemu -usb -device usb-ccid -device ccid-card-emulated,backend=certificates,db=sql:$PWD,cert1=id-cert,cert2=signing-cert,cert3=encryption-cert
</pre></div>
</div>
<p>To use the certificates in the guest, export the CA certificate:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>certutil -L -r -d sql:$PWD -o fake-smartcard-ca.cer -n fake-smartcard-ca
</pre></div>
</div>
<p>and import it in the guest:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">certutil</span> <span class="o">-</span><span class="n">A</span> <span class="o">-</span><span class="n">d</span> <span class="o">/</span><span class="n">etc</span><span class="o">/</span><span class="n">pki</span><span class="o">/</span><span class="n">nssdb</span> <span class="o">-</span><span class="n">i</span> <span class="n">fake</span><span class="o">-</span><span class="n">smartcard</span><span class="o">-</span><span class="n">ca</span><span class="o">.</span><span class="n">cer</span> <span class="o">-</span><span class="n">t</span> <span class="n">TC</span><span class="p">,</span><span class="n">TC</span><span class="p">,</span><span class="n">TC</span> <span class="o">-</span><span class="n">n</span> <span class="n">fake</span><span class="o">-</span><span class="n">smartcard</span><span class="o">-</span><span class="n">ca</span>
</pre></div>
</div>
<p>In a Linux guest you can then use the CoolKey PKCS #11 module to access
the card:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">certutil</span> <span class="o">-</span><span class="n">d</span> <span class="o">/</span><span class="n">etc</span><span class="o">/</span><span class="n">pki</span><span class="o">/</span><span class="n">nssdb</span> <span class="o">-</span><span class="n">L</span> <span class="o">-</span><span class="n">h</span> <span class="nb">all</span>
</pre></div>
</div>
<p>It will prompt you for the PIN (which is the password you assigned to the
certificate database early on), and then show you all three certificates
together with the manually imported CA cert:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Certificate</span> <span class="n">Nickname</span> <span class="n">Trust</span> <span class="n">Attributes</span>
<span class="n">fake</span><span class="o">-</span><span class="n">smartcard</span><span class="o">-</span><span class="n">ca</span> <span class="n">CT</span><span class="p">,</span><span class="n">C</span><span class="p">,</span><span class="n">C</span>
<span class="n">John</span> <span class="n">Doe</span><span class="p">:</span><span class="n">CAC</span> <span class="n">ID</span> <span class="n">Certificate</span> <span class="n">u</span><span class="p">,</span><span class="n">u</span><span class="p">,</span><span class="n">u</span>
<span class="n">John</span> <span class="n">Doe</span><span class="p">:</span><span class="n">CAC</span> <span class="n">Email</span> <span class="n">Signature</span> <span class="n">Certificate</span> <span class="n">u</span><span class="p">,</span><span class="n">u</span><span class="p">,</span><span class="n">u</span>
<span class="n">John</span> <span class="n">Doe</span><span class="p">:</span><span class="n">CAC</span> <span class="n">Email</span> <span class="n">Encryption</span> <span class="n">Certificate</span> <span class="n">u</span><span class="p">,</span><span class="n">u</span><span class="p">,</span><span class="n">u</span>
</pre></div>
</div>
<p>If this does not happen, CoolKey is not installed or not registered with
NSS. Registration can be done from Firefox or the command line:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">modutil</span> <span class="o">-</span><span class="n">dbdir</span> <span class="o">/</span><span class="n">etc</span><span class="o">/</span><span class="n">pki</span><span class="o">/</span><span class="n">nssdb</span> <span class="o">-</span><span class="n">add</span> <span class="s2">&quot;CAC Module&quot;</span> <span class="o">-</span><span class="n">libfile</span> <span class="o">/</span><span class="n">usr</span><span class="o">/</span><span class="n">lib64</span><span class="o">/</span><span class="n">pkcs11</span><span class="o">/</span><span class="n">libcoolkeypk11</span><span class="o">.</span><span class="n">so</span>
<span class="n">modutil</span> <span class="o">-</span><span class="n">dbdir</span> <span class="o">/</span><span class="n">etc</span><span class="o">/</span><span class="n">pki</span><span class="o">/</span><span class="n">nssdb</span> <span class="o">-</span><span class="nb">list</span>
</pre></div>
</div>
</section>
<section id="using-ccid-card-passthru-with-client-side-hardware">
<h2>Using ccid-card-passthru with client side hardware<a class="headerlink" href="#using-ccid-card-passthru-with-client-side-hardware" title="Link to this heading"></a></h2>
<p>On the host specify the ccid-card-passthru device with a suitable chardev:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span> <span class="o">-</span><span class="n">chardev</span> <span class="n">socket</span><span class="p">,</span><span class="n">server</span><span class="o">=</span><span class="n">on</span><span class="p">,</span><span class="n">host</span><span class="o">=</span><span class="mf">0.0.0.0</span><span class="p">,</span><span class="n">port</span><span class="o">=</span><span class="mi">2001</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">ccid</span><span class="p">,</span><span class="n">wait</span><span class="o">=</span><span class="n">off</span> \
<span class="o">-</span><span class="n">usb</span> <span class="o">-</span><span class="n">device</span> <span class="n">usb</span><span class="o">-</span><span class="n">ccid</span> <span class="o">-</span><span class="n">device</span> <span class="n">ccid</span><span class="o">-</span><span class="n">card</span><span class="o">-</span><span class="n">passthru</span><span class="p">,</span><span class="n">chardev</span><span class="o">=</span><span class="n">ccid</span>
</pre></div>
</div>
<p>On the client run vscclient, built when you built QEMU:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">vscclient</span> <span class="o">&lt;</span><span class="n">qemu</span><span class="o">-</span><span class="n">host</span><span class="o">&gt;</span> <span class="mi">2001</span>
</pre></div>
</div>
</section>
<section id="using-ccid-card-passthru-with-client-side-certificates">
<h2>Using ccid-card-passthru with client side certificates<a class="headerlink" href="#using-ccid-card-passthru-with-client-side-certificates" title="Link to this heading"></a></h2>
<p>This case is not particularly useful, but you can use it to debug
your setup.</p>
<p>Follow instructions above, except run QEMU and vscclient as follows.</p>
<p>Run qemu as per above, and run vscclient from the “fake-smartcard”
directory as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">qemu</span> <span class="o">-</span><span class="n">chardev</span> <span class="n">socket</span><span class="p">,</span><span class="n">server</span><span class="o">=</span><span class="n">on</span><span class="p">,</span><span class="n">host</span><span class="o">=</span><span class="mf">0.0.0.0</span><span class="p">,</span><span class="n">port</span><span class="o">=</span><span class="mi">2001</span><span class="p">,</span><span class="nb">id</span><span class="o">=</span><span class="n">ccid</span><span class="p">,</span><span class="n">wait</span><span class="o">=</span><span class="n">off</span> \
<span class="o">-</span><span class="n">usb</span> <span class="o">-</span><span class="n">device</span> <span class="n">usb</span><span class="o">-</span><span class="n">ccid</span> <span class="o">-</span><span class="n">device</span> <span class="n">ccid</span><span class="o">-</span><span class="n">card</span><span class="o">-</span><span class="n">passthru</span><span class="p">,</span><span class="n">chardev</span><span class="o">=</span><span class="n">ccid</span>
<span class="n">vscclient</span> <span class="o">-</span><span class="n">e</span> <span class="s2">&quot;db=</span><span class="se">\&quot;</span><span class="s2">sql:$PWD</span><span class="se">\&quot;</span><span class="s2"> use_hw=no soft=(,Test,CAC,,id-cert,signing-cert,encryption-cert)&quot;</span> <span class="o">&lt;</span><span class="n">qemu</span><span class="o">-</span><span class="n">host</span><span class="o">&gt;</span> <span class="mi">2001</span>
</pre></div>
</div>
</section>
<section id="passthrough-protocol-scenario">
<h2>Passthrough protocol scenario<a class="headerlink" href="#passthrough-protocol-scenario" title="Link to this heading"></a></h2>
<p>This is a typical interchange of messages when using the passthru card device.
usb-ccid is a usb device. It defaults to an unattached usb device on startup.
usb-ccid expects a chardev and expects the protocol defined in
cac_card/vscard_common.h to be passed over that.
The usb-ccid device can be in one of three modes:</p>
<ul class="simple">
<li><p>detached</p></li>
<li><p>attached with no card</p></li>
<li><p>attached with card</p></li>
</ul>
<p>A typical interchange is (the arrow shows who started each exchange, it can be client
originated or guest originated):</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">client</span> <span class="n">event</span> <span class="o">|</span> <span class="n">vscclient</span> <span class="o">|</span> <span class="n">passthru</span> <span class="o">|</span> <span class="n">usb</span><span class="o">-</span><span class="n">ccid</span> <span class="o">|</span> <span class="n">guest</span> <span class="n">event</span>
<span class="o">------------------------------------------------------------------------------------------------</span>
<span class="o">|</span> <span class="n">VSC_Init</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">VSC_ReaderAdd</span> <span class="o">|</span> <span class="o">|</span> <span class="n">attach</span> <span class="o">|</span>
<span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="n">sees</span> <span class="n">new</span> <span class="n">usb</span> <span class="n">device</span><span class="o">.</span>
<span class="n">card</span> <span class="n">inserted</span> <span class="o">-&gt;</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">VSC_ATR</span> <span class="o">|</span> <span class="n">insert</span> <span class="o">|</span> <span class="n">insert</span> <span class="o">|</span> <span class="n">see</span> <span class="n">new</span> <span class="n">card</span>
<span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">VSC_APDU</span> <span class="o">|</span> <span class="n">VSC_APDU</span> <span class="o">|</span> <span class="o">|</span> <span class="o">&lt;-</span> <span class="n">guest</span> <span class="n">sends</span> <span class="n">APDU</span>
<span class="n">client</span> <span class="o">&lt;-&gt;</span> <span class="n">physical</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="n">card</span> <span class="n">APDU</span> <span class="n">exchange</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="n">client</span> <span class="n">response</span> <span class="o">-&gt;</span> <span class="o">|</span> <span class="n">VSC_APDU</span> <span class="o">|</span> <span class="n">VSC_APDU</span> <span class="o">|</span> <span class="o">|</span> <span class="n">receive</span> <span class="n">APDU</span> <span class="n">response</span>
<span class="o">...</span>
<span class="p">[</span><span class="n">APDU</span><span class="o">&lt;-&gt;</span><span class="n">APDU</span> <span class="n">repeats</span> <span class="n">several</span> <span class="n">times</span><span class="p">]</span>
<span class="o">...</span>
<span class="n">card</span> <span class="n">removed</span> <span class="o">-&gt;</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">VSC_CardRemove</span> <span class="o">|</span> <span class="n">remove</span> <span class="o">|</span> <span class="n">remove</span> <span class="o">|</span> <span class="n">card</span> <span class="n">removed</span>
<span class="o">...</span>
<span class="p">[(</span><span class="n">card</span> <span class="n">insert</span><span class="p">,</span> <span class="n">apdu</span><span class="s1">&#39;s, card remove) repeat]</span>
<span class="o">...</span>
<span class="n">kill</span><span class="o">/</span><span class="n">quit</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="n">vscclient</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span>
<span class="o">|</span> <span class="n">VSC_ReaderRemove</span> <span class="o">|</span> <span class="o">|</span> <span class="n">detach</span> <span class="o">|</span>
<span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="n">usb</span> <span class="n">device</span> <span class="n">removed</span><span class="o">.</span>
</pre></div>
</div>
</section>
<section id="libcacard">
<h2>libcacard<a class="headerlink" href="#libcacard" title="Link to this heading"></a></h2>
<p>Both ccid-card-emulated and vscclient use libcacard as the card emulator.
libcacard implements a completely virtual CAC (DoD standard for smart
cards) compliant card and uses NSS to retrieve certificates and do
any encryption. The backend can then be a real reader and card, or
certificates stored in files.</p>
</section>
</section>
</div>
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