Xojo Plugin

Verify FTP SSL Server Certificate

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This 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. Xojo Plugin

Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim ftp As 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.
success = ftp.Connect()
If (success = False) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

// After logging on, you may examine the FTP server's cert:
Dim cert As New Chilkat.Cert
success = ftp.GetServerCert(cert)
If (success = False) Then
    System.DebugLog("No server certificate!")
Else
    // Display the distinguished name of the SSL cert.
    System.DebugLog(cert.SubjectDN)
End If

System.DebugLog("Secure FTP Channel Established!")

// Do whatever you're doing to do ...
// upload files, download files, etc...

success = ftp.Disconnect()