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POAuthenticate server (peer) with SSL
 

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    <p>I would want my C/C++ client to authenticate the server via SSL. I first downloaded the certificate file from the server with<br> <code>openssl s_client -showcerts -connect www.openssl.org:443 &lt;/dev/null 2&gt;/dev/null | openssl x509 -outform PEM &gt; mycertfile.pem</code></p> <p>Then in my application I do the following API invocations (pseudo code):</p> <pre><code> // Register the error strings for libcrypto & libssl SSL_load_error_strings(); // Register the available ciphers and digests SSL_library_init(); // New context saying we are a client, and using SSL 2 or 3 ctx = SSL_CTX_new(SSLv23_client_method()); // load the certificate if(!SSL_CTX_load_verify_locations(ctx, "mycertfile.pem", 0)) ... // Create an SSL struct for the connection ssl = SSL_new(ctx); // Connect the SSL struct to our pre-existing TCP/IP socket connection if (!SSL_set_fd(ssl, sd)) ... // Initiate SSL handshake if(SSL_connect(ssl) != 1) ... // form this point onwards the SSL connection is established and works // perfectly, I would be able to send and receive encrypted data // **Crucial point now** // Get certificate (it works) X509 *cert = SSL_get_peer_certificate(ssl); if(cert) { // the below API returns code 19 const long cert_res = SSL_get_verify_result(ssl); if(cert_res == X509_V_OK) { printf("Certificate verified!\n"); } X509_free(cert); } </code></pre> <p>Above code works fine if I don't mind checking the certificate and I'm just interested in an encrypted connection.<br> Problem with it is that when I try to verify the authenticity of the server, I <em>do</em> get the certificate from <code>SSL_get_peer_certificate</code> but then the verification of results doesn't work <em>even</em> if I've just downloaded the certificate 5 minutes before.</p> <p>What am I doing wrong?</p> <p>All this is on Ubuntu 12.04.03 x86-64 with gcc and <em>openssl</em>.</p> <p>Thanks, Ema</p>
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