Lianja

FTP Connect, Examine Server Certificate, and then Authenticate

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Demonstrates how to connect to an FTP server, examine the server's SSL/TLS certificate, and then, if it meets the application's security requirements, proceed to authenticate. Lianja

llSuccess = .F.

// This example assumes Chilkat Ftp2 to have been previously unlocked.
// See Unlock Ftp2 for sample code.

loFtp = createobject("CkFtp2")

loFtp.Hostname = "www.authtls-ftps-server.com"
loFtp.Username = "FTP_LOGIN"
loFtp.Password = "FTP_PASSWORD"
loFtp.AuthTls = .T.
loFtp.Port = 21

// Connect to the FTP server using explicit TLS (AUTH TLS).
llSuccess = loFtp.ConnectOnly()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif

// Get the FTP server's certificate.
loServerCert = createobject("CkCert")
llSuccess = loFtp.GetServerCert(loServerCert)
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    release loServerCert
    return
endif

// Now that we have the certificate, we can check it in any way we desire.
// (See the online reference documentation for the certificate object's methods
// and properties)...

// Assuming the certificate is OK, proceed to authenticate with the FTP server.
llSuccess = loFtp.LoginAfterConnectOnly()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    release loServerCert
    return
endif

// 
// Proceed with uploading/download files, etc...
// 

loFtp.Disconnect()
? "Success."


release loFtp
release loServerCert