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(.NET Core C#) Verify FTP SSL Server CertificateThis example demonstrates how to verify the FTP server's certificate and authenticity. The intent is to verify the authenticity of the server before passing a login/password to it.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Ftp2 ftp = new Chilkat.Ftp2(); ftp.Hostname = "ftp.myftpserver.com"; ftp.Username = "myUsername"; ftp.Password = "myPassword"; // Establish an AUTH SSL secure channel after connection // on the standard FTP port 21. ftp.AuthSsl = true; // The Ssl property is for establishing an implicit SSL connection // on port 990. Do not set it. ftp.Ssl = false; // Indicate that the FTP server must have a verifiable SSL certificate. // Do not accept self-signed certs or certificates that are // expired, revoked, or cannot be verified to a root authority: ftp.RequireSslCertVerify = true; // You may also set a requirement. In this example, // the certificate's Common Name (CN) must match the // required string exactly: ftp.SetSslCertRequirement("subjectcn","Chilkat Software, Inc."); // Connect and login to the FTP server. bool success = ftp.Connect(); if (success != true) { Debug.WriteLine(ftp.LastErrorText); return; } else { // LastErrorText contains information even when // successful. This allows you to visually verify // that the secure connection actually occurred. Debug.WriteLine(ftp.LastErrorText); } // After logging on, you may examine the FTP server's cert: Chilkat.Cert cert = null; cert = ftp.GetSslServerCert(); if (ftp.LastMethodSuccess != true) { Debug.WriteLine("No server certificate!"); } else { // Display the distinguished name of the SSL cert. Debug.WriteLine(cert.SubjectDN); } Debug.WriteLine("Secure FTP Channel Established!"); // Do whatever you're doing to do ... // upload files, download files, etc... success = ftp.Disconnect(); |
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