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(Unicode C) Accept TLS Connection with Client AuthenticationDemonstrates how to accept a TLS connection requiring client authentication. This is the case where the TLS client sends a certificate. It is also known as "Two-Way SSL".
#include <C_CkSocketW.h> #include <C_CkCertW.h> void ChilkatSample(void) { HCkSocketW listenSslSocket; HCkCertW cert; BOOL success; int myPort; int backLog; HCkSocketW clientSock; int maxWaitMillisec; const wchar_t *receivedMsg; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. listenSslSocket = CkSocketW_Create(); // An SSL/TLS server needs a digital certificate. This example loads it from a PFX file. // Note: This is the server's certificate. cert = CkCertW_Create(); // The 1st argument is the file path, the 2nd arg is the // PFX file's password: success = CkCertW_LoadPfxFile(cert,L"chilkat.pfx",L"test"); if (success != TRUE) { wprintf(L"%s\n",CkCertW_lastErrorText(cert)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } // To accept client client certificates in the TLS handshake, // we must indicate a list of acceptable client certificate root CA DN's // that are allowed. (DN is an acronym for Distinguished Name.) // Call AddSslAcceptableClientCaDn once for each acceptable CA DN. // Here are a few examples so you can see the general format of a DN. CkSocketW_AddSslAcceptableClientCaDn(listenSslSocket,L"C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root"); CkSocketW_AddSslAcceptableClientCaDn(listenSslSocket,L"O=Digital Signature Trust Co., CN=DST Root CA X3"); // Use the certificate: success = CkSocketW_InitSslServer(listenSslSocket,cert); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } // Bind and listen on a port: myPort = 8123; // Allow for a max of 5 queued connect requests. backLog = 5; success = CkSocketW_BindAndListen(listenSslSocket,myPort,backLog); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } // If accepting an SSL/TLS connection, the SSL handshake is part of the connection // establishment process. This involves a few back-and-forth messages between the // client and server to establish algorithms and a shared key to create the secure // channel. The sending and receiving of these messages are governed by the // MaxReadIdleMs and MaxSendIdleMs properties. If these properties are set to 0 // (and this is the default unless changed by your application), then the // AcceptNextConnection can hang indefinitely during the SSL handshake process. // Make sure these properties are set to appropriate values before calling AcceptNextConnection. // Set a 10 second max for waiting to read/write. This is for the SSL/TLS handshake establishment. CkSocketW_putMaxReadIdleMs(listenSslSocket,10000); CkSocketW_putMaxSendIdleMs(listenSslSocket,10000); // Accept a single client connection and establish the secure SSL/TLS channel: maxWaitMillisec = 20000; clientSock = CkSocketW_AcceptNextConnection(listenSslSocket,maxWaitMillisec); if (CkSocketW_getLastMethodSuccess(listenSslSocket) == FALSE) { wprintf(L"%s\n",CkSocketW_lastErrorText(listenSslSocket)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } // The client (in this example) is going to send a "Hello Server! -EOM-" // message. Read it: receivedMsg = CkSocketW_receiveUntilMatch(clientSock,L"-EOM-"); if (CkSocketW_getLastMethodSuccess(clientSock) != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(clientSock)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } wprintf(L"%s\n",receivedMsg); // Send a "Hello Client! -EOM-" message: success = CkSocketW_SendString(clientSock,L"Hello Client! -EOM-"); if (success != TRUE) { wprintf(L"%s\n",CkSocketW_lastErrorText(clientSock)); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); return; } // Close the connection with the client // Wait a max of 20 seconds (20000 millsec) success = CkSocketW_Close(clientSock,20000); CkSocketW_Dispose(clientSock); CkSocketW_Dispose(listenSslSocket); CkCertW_Dispose(cert); } |
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