CODEWITHSUNDEEP
c#sslftpcertificate
Evgeni Dimitrov
Evgeni Dimitrov

Reputation: 22516

FTPS using fingerpring

I have to communicate to an FTP server with SSL.

I've received an example on how to do that that uses, I believe, the WinScp command:

open ftpes://SomeUser:[email protected]/ -certificate="xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"

The question is how to use the -certificate part in an application? Do I have to save the string in a file or...?

For example if we use C#'s FtpWebRequest:

FtpWebRequest ftp = (FtpWebRequest)WebRequest.Create(downlaodLocation);

how can we use this fingerprint?

X509Certificate class has a constructor that accepts byte[].

byte[] toBytes = Encoding.ASCII.GetBytes("xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx");
ftp.ClientCertificates.Add(new X509Certificate(toBytes));

Is this the right way to use the certificate fingerprint?

Upvotes: 3

Views: 1630

Answers (1)

Evgeni Dimitrov
Evgeni Dimitrov

Reputation: 22516

Eventually I took a different approach for uploading the file and used WinScp for c# lib for that.

            SessionOptions sessionOptions = new SessionOptions
            {
                Protocol = Protocol.Sftp,
                HostName = ConfigurationManager.AppSettings["FTP.HOSTNAME"],
                UserName = ConfigurationManager.AppSettings["FTP.USERNAME"],
                Password = ConfigurationManager.AppSettings["FTP.PASSWORD"],
            };
            if (port.HasValue)
            {
                sessionOptions.PortNumber = port.Value;
            }

                sessionOptions.SshHostKeyFingerprint = ConfigurationManager.AppSettings["FTP.CERT.FINGERPRINT"].Trim();

            using (Session session = new Session())
            {
                if (!string.IsNullOrWhiteSpace(ConfigurationManager.AppSettings["LOG.PATH"]))
                {
                    session.SessionLogPath = ConfigurationManager.AppSettings["LOG.PATH"];
                }
                session.Open(sessionOptions);
                TransferOptions transferOptions = new TransferOptions
                {
                    TransferMode = TransferMode.Binary
                };

                TransferOperationResult transferResult = session.PutFiles(ConfigurationManager.AppSettings["FILE.TO.UPLOAD"], ConfigurationManager.AppSettings["FILE.DESTINATION.NAME"], true, transferOptions);

                transferResult.Check();

                StringBuilder result = new StringBuilder();
                foreach (TransferEventArgs transfer in transferResult.Transfers)
                {
                    result.Append(string.Format("Upload of {0} : {1}", transfer.FileName, transfer.Error));
                }
                Console.WriteLine(result.ToString());
            }

Upvotes: 1

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