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    <p><strong>Short answer</strong>: The Boost callback function, from the link you cited, doesn't verify anything. It returns whatever preliminary verification result was supplied to it by OpenSSL (via <code>bool preverified</code>). If there is any fine grained verification required (like the CN match, etc.), it has to be done explicitly by the callback.</p> <p><strong>Long answer</strong>: By the time the OpenSSL (or the Boost wrapper for OpenSSL) calls the verification function, in this case, <code>bool verify_certificate(bool preverified, boost::asio::ssl::verify_context&amp; ctx)</code>, a set of preliminary (or mandatory) verification is already done by OpenSSL. This is explained in the <a href="http://www.openssl.org/docs/ssl/SSL_CTX_set_verify.html">documentation</a>.</p> <blockquote> <p>The certificate chain is checked starting with the deepest nesting level (the root CA certificate) and worked upward to the peer's certificate. At each level signatures and issuer attributes are checked. Whenever a verification error is found, the error number is stored in x509_ctx and verify_callback is called with preverify_ok=0. By applying X509_CTX_store_* functions verify_callback can locate the certificate in question and perform additional steps (see EXAMPLES). If no error is found for a certificate, verify_callback is called with preverify_ok=1 before advancing to the next level.</p> </blockquote> <p>The documentation also cites an example of how a more fine-grained verification callback could be written. You can draw inspiration from that depending on what your needs are.</p> <p><strong>EDIT:</strong> To be sure that Boost's internal callback function doesn't do anything special other than calling the application callback function, I took a look at <a href="http://www.boost.org/doc/libs/1_51_0_beta1/boost/asio/ssl/detail/impl/engine.ipp">engine.ipp</a>, the C++ module that invokes OpenSSL's <code>SSL_set_verify</code> to set up callback functions. Take a look at how <code>verify_callback_function</code> is implemented. It simply invokes the application callback.</p>
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    1. COSorry about the late reply/thumbs up. Stackoverflow changed something with their site, and their page is now broken under the EFF's [HTTPS Everywhere](https://www.eff.org/https-everywhere). I had to wait until I got on a different machine.
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    2. COI believe it is broken even if you implement the callback. I'm fairly certain `SSL_get_peer_certificate` still needs to be called (even though the callback is invoked); `SSL_get_verify_result` still needs to be called (even though the callback is invoked); and both happen outside the callback.
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    3. CONothing, in my understanding, is broken. The callback is called after OpenSSL does the preliminary verification. The callback is called with the preverification status to allow the application to finally decide whether to accept the certificate or not. If you don't have anything more to verify, you don't even have to implement the callback. ``SSL_get_peer_certificate`` and ``SSL_get_verify_result`` are helper functions to aid you in getting additional information about the certificate and verification process. It has nothing to do with callback. This is how OpenSSL without boost works as well.
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