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(Lianja) Verify FTP SSL Server Certificate

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.

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Chilkat Lianja Extension

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

loFtp = createobject("CkFtp2")

loFtp.Hostname = "ftp.myftpserver.com"
loFtp.Username = "myUsername"
loFtp.Password = "myPassword"

// Establish an AUTH SSL secure channel after connection
// on the standard FTP port 21.
loFtp.AuthSsl = .T.

// The Ssl property is for establishing an implicit SSL connection
// on port 990.  Do not set it.
loFtp.Ssl = .F.

// 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:
loFtp.RequireSslCertVerify = .T.

// You may also set a requirement.  In this example,
// the certificate's Common Name (CN) must match the
// required string exactly:
loFtp.SetSslCertRequirement("subjectcn","Chilkat Software, Inc.")

// Connect and login to the FTP server.
llSuccess = loFtp.Connect()
if (llSuccess <> .T.) then
    ? loFtp.LastErrorText
    release loFtp
    return
else
    // LastErrorText contains information even when
    // successful. This allows you to visually verify
    // that the secure connection actually occurred.
    ? loFtp.LastErrorText
endif

// After logging on, you may examine the FTP server's cert:

loCert = loFtp.GetSslServerCert()
if (loFtp.LastMethodSuccess <> .T.) then
    ? "No server certificate!"
else
    // Display the distinguished name of the SSL cert.
    ? loCert.SubjectDN
endif

? "Secure FTP Channel Established!"

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

llSuccess = loFtp.Disconnect()


release loFtp

 

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