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(.NET Core C#) Trust Specific Root CA CertificatesDemonstrates how to trust specific root CA certificates and none others.
// 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. Chilkat.TrustedRoots tRoots = new Chilkat.TrustedRoots(); Chilkat.Cert caCert = new Chilkat.Cert(); bool success = caCert.LoadFromFile("qa_data/certs/aws_root_ca/AmazonRootCA1.cer"); if (success == false) { Debug.WriteLine(caCert.LastErrorText); return; } success = tRoots.AddCert(caCert); // Continue with the others. // For brevity, we're not checking return values for success/failure. success = caCert.LoadFromFile("qa_data/certs/aws_root_ca/AmazonRootCA2.cer"); success = tRoots.AddCert(caCert); success = caCert.LoadFromFile("qa_data/certs/aws_root_ca/AmazonRootCA3.cer"); success = tRoots.AddCert(caCert); success = caCert.LoadFromFile("qa_data/certs/aws_root_ca/AmazonRootCA4.cer"); success = tRoots.AddCert(caCert); success = caCert.LoadFromFile("qa_data/certs/aws_root_ca/SFSRootCAG2.cer"); success = tRoots.AddCert(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. tRoots.TrustSystemCaRoots = 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 = tRoots.Activate(); Chilkat.Http http = new Chilkat.Http(); // Note: We also need to explicitly indicate that server certificates are to be verified. http.RequireSslCertVerify = 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 = http.Download("https://www.chilkatsoft.com/helloWorld.txt","qa_output/helloWorld.txt"); if (success != true) { // The above Download should fail. Debug.WriteLine(http.LastErrorText); // 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 = http.Download("https://good.sca1a.amazontrust.com/","qa_output/valid.html"); if (success != true) { Debug.WriteLine(http.LastErrorText); 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." Debug.WriteLine(http.LastErrorText); Debug.WriteLine("Success!"); |
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