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POOpenSSL, RSA and Winsock and C++
 

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  1. POOpenSSL, RSA and Winsock and C++
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    <p>I found this source floating about the net and I was hoping someone could solve why this program simply shuts down instead of listening for a connection. This source was meant to open a server socket but, doesn't.</p> <pre><code>#include &lt;openssl/bio.h&gt; #include &lt;openssl/ssl.h&gt; #include &lt;openssl/err.h&gt; #include &lt;iostream&gt; #include &lt;stdio.h&gt; #include &lt;winsock2.h&gt; #define PASSWORD "passme" int main(int argc, char** argv) { CRYPTO_malloc_init(); // Initialize malloc, free, etc for OpenSSL's use SSL_library_init(); // Initialize OpenSSL's SSL libraries SSL_load_error_strings(); // Load SSL error strings ERR_load_BIO_strings(); // Load BIO error strings OpenSSL_add_all_algorithms(); // Load all available encryption algorithms return 0; } void serverThread() { // First, we need to initialize Winsock. WSADATA wsadata; int ret = WSAStartup(0x101, &amp;wsadata); if (ret != 0) { printf("WSAStartup() failed with: %d!\n", GetLastError()); return; } // Next we need to create a server socket. SOCKET server = socket(AF_INET, SOCK_STREAM, 0); sockaddr_in sockaddrin; // Internet socket sockaddrin.sin_family = AF_INET; // Accept any IP sockaddrin.sin_addr.s_addr = INADDR_ANY; // Use port 6789 sockaddrin.sin_port = htons(6789); // Valid socket? if (server == INVALID_SOCKET) { printf("Error creating server socket!"); return; } // Now bind to the port ret = bind(server, (sockaddr*) &amp;(sockaddrin), sizeof(sockaddrin)); if (ret != 0) { printf("Error binding to port!\n"); return; } // Start listening for connections // Second param is max number of connections ret = listen(server, 50); if (ret != 0) { printf("Error listening for connections!\n"); return; } // Set up to accept connections SOCKET client; sockaddr_in clientsockaddrin; int len = sizeof(clientsockaddrin); printf("Server ready to accept connections!\n"); while (1) { // Block until a connection is ready client = accept(server, (sockaddr*) &amp;clientsockaddrin, &amp;len); printf("Connection recieved from %s!\n", inet_ntoa(clientsockaddrin.sin_addr)); // Notice that we use server_method instead of client_method SSL_CTX* ctx = SSL_CTX_new(SSLv23_server_method()); BIO* bio = BIO_new_file("dh1024.pem", "r"); // Did we get a handle to the file? if (bio == NULL) { printf("Couldn't open DH param file!\n"); break; } // Read in the DH params. DH* ret = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); // Free up the BIO object. BIO_free(bio); // Set up our SSL_CTX to use the DH parameters. if (SSL_CTX_set_tmp_dh(ctx, ret) &lt; 0) { printf("Couldn't set DH parameters!\n"); break; } // Now we need to generate a RSA key for use. // 1024-bit key. If you want to use something stronger, go ahead but it must be a power of 2. Upper limit should be 4096. RSA* rsa = RSA_generate_key(1024, RSA_F4, NULL, NULL); // Set up our SSL_CTX to use the generated RSA key. if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) { printf("Couldn't set RSA key!\n"); // We don't break out here because it's not a requirement for the RSA key to be set. It does help to have it. } // Free up the RSA structure. RSA_free(rsa); SSL_CTX_set_cipher_list(ctx, "ALL"); // Set up our SSL object as before SSL* ssl = SSL_new(ctx); // Set up our BIO object to use the client socket BIO* sslclient = BIO_new_socket(client, BIO_NOCLOSE); // Set up our SSL object to use the BIO. SSL_set_bio(ssl, sslclient, sslclient); // Do SSL handshaking. int r = SSL_accept(ssl); // Something failed. Print out all the error information, since all of it may be relevant to the problem. if (r != 1) { printf("SSL_accept() returned %d\n", r); printf("Error in SSL_accept(): %d\n", SSL_get_error(ssl, r)); char error[65535]; ERR_error_string_n(ERR_get_error(), error, 65535); printf("Error: %s\n\n", error); ERR_print_errors(sslclient); int err = WSAGetLastError(); printf("WSA: %d\n", err); break; } } } int password_callback(char* buffer, int num, int rwflag, void* userdata) { if (num &lt; (strlen(PASSWORD) + 1)) { return(0); } strcpy(buffer, PASSWORD); return strlen(PASSWORD); } int verify_callback(int ok, X509_STORE_CTX* store) { char data[255]; if (!ok) { X509* cert = X509_STORE_CTX_get_current_cert(store); int depth = X509_STORE_CTX_get_error_depth(store); int err = X509_STORE_CTX_get_error(store); printf("Error with certificate at depth: %d!\n", depth); X509_NAME_oneline(X509_get_issuer_name(cert), data, 255); printf("\tIssuer: %s\n", data); X509_NAME_oneline(X509_get_subject_name(cert), data, 255); printf("\tSubject: %s\n", data); printf("\tError %d: %s\n", err, X509_verify_cert_error_string(err)); } return ok; } </code></pre>
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