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(Unicode C) Trust Specific Root CA CertificatesDemonstrates how to trust specific root CA certificates and none others.
#include <C_CkTrustedRootsW.h> #include <C_CkCertW.h> #include <C_CkHttpW.h> void ChilkatSample(void) { HCkTrustedRootsW tRoots; HCkCertW caCert; BOOL success; HCkHttpW http; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // This example will trust the Amazon root CA certificates provided at // https://www.amazontrust.com/repository/ // I've previously downloaded the root CA certificates to DER format. // Add each to the Chilkat TrustedRoots singleton object. tRoots = CkTrustedRootsW_Create(); caCert = CkCertW_Create(); success = CkCertW_LoadFromFile(caCert,L"qa_data/certs/aws_root_ca/AmazonRootCA1.cer"); if (success == FALSE) { wprintf(L"%s\n",CkCertW_lastErrorText(caCert)); CkTrustedRootsW_Dispose(tRoots); CkCertW_Dispose(caCert); return; } success = CkTrustedRootsW_AddCert(tRoots,caCert); // Continue with the others. // For brevity, we're not checking return values for success/failure. success = CkCertW_LoadFromFile(caCert,L"qa_data/certs/aws_root_ca/AmazonRootCA2.cer"); success = CkTrustedRootsW_AddCert(tRoots,caCert); success = CkCertW_LoadFromFile(caCert,L"qa_data/certs/aws_root_ca/AmazonRootCA3.cer"); success = CkTrustedRootsW_AddCert(tRoots,caCert); success = CkCertW_LoadFromFile(caCert,L"qa_data/certs/aws_root_ca/AmazonRootCA4.cer"); success = CkTrustedRootsW_AddCert(tRoots,caCert); success = CkCertW_LoadFromFile(caCert,L"qa_data/certs/aws_root_ca/SFSRootCAG2.cer"); success = CkTrustedRootsW_AddCert(tRoots,caCert); // Indicate we don't want to automatically trust the operating system's installed root CA certificates. // On a Windows operating system, this would be the registry-based CA certificate stores. // On a Linux system, this could be /etc/ssl/certs/ca-certificates.crt, if it exists. CkTrustedRootsW_putTrustSystemCaRoots(tRoots,FALSE); // Activate the trusted roots object. // Once activated, all Chilkat objects that use TLS connections (HTTP, REST, Socket, MailMan, IMAP, FTP, etc.) // will fail the TLS handshake if the server certificate is not verified and rooted with one of our explicitly trusted root certificates. success = CkTrustedRootsW_Activate(tRoots); http = CkHttpW_Create(); // Note: We also need to explicitly indicate that server certificates are to be verified. CkHttpW_putRequireSslCertVerify(http,TRUE); // For example, the following should fail because www.chilkatsoft.com's server certificate is not rooted in one of the explicitly trusted root CA certs. success = CkHttpW_Download(http,L"https://www.chilkatsoft.com/helloWorld.txt",L"qa_output/helloWorld.txt"); if (success != TRUE) { // The above Download should fail. wprintf(L"%s\n",CkHttpW_lastErrorText(http)); // There should be a message in the LastErrorText indicating that we were "Unable to build certificate chain to root.." } // However, we should be able to make TLS connections to good.sca1a.amazontrust.com success = CkHttpW_Download(http,L"https://good.sca1a.amazontrust.com/",L"qa_output/valid.html"); if (success != TRUE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkTrustedRootsW_Dispose(tRoots); CkCertW_Dispose(caCert); CkHttpW_Dispose(http); return; } // We can still examine the LastErrorText and we'll find this message within: // "The public key was successfully validated against the public key of the explicitly trusted root cert." wprintf(L"%s\n",CkHttpW_lastErrorText(http)); wprintf(L"Success!\n"); CkTrustedRootsW_Dispose(tRoots); CkCertW_Dispose(caCert); CkHttpW_Dispose(http); } |
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