Lianja

Verify and Pin the FTPS Server Certificate

Demonstrates the certificate-verification properties RequireSslCertVerify, TlsPinSet, and the read-only SslServerCertVerified.

Background: By default a TLS connection is not rejected merely because certificate-chain verification fails, so RequireSslCertVerify = true is the important hardening step — it makes an expired, unsigned, or untrusted certificate abort the connection. TlsPinSet adds public-key pinning on top: the handshake fails unless the server's SPKI fingerprint matches one you configured, defending against a mis-issued certificate that would otherwise validate. Pinning supplements verification rather than replacing it. SslServerCertVerified reports the outcome.

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llSuccess = .F.

loFtp = createobject("CkFtp2")

loFtp.Hostname = "ftp.example.com"
loFtp.Username = "myFtpLogin"

loFtp.AuthTls = .T.

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
loFtp.Password = "myPassword"

//  Reject the connection if the server certificate cannot be verified (expired, bad signature,
//  untrusted chain, etc.).  The default is .F., which does not reject on verification
//  failure -- set .T. for security.
loFtp.RequireSslCertVerify = .T.

//  Optionally pin the server's public key.  If none of the configured SPKI fingerprints matches,
//  the TLS handshake fails.  Pinning supplements normal verification; it does not replace it.
loFtp.TlsPinSet = "sha256//YLh1dUR9y6Kja30RrAn7JKnbQG/uEtLMkBgFF2Fuihg="

llSuccess = loFtp.Connect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif

//  SslServerCertVerified reports whether the certificate chain was successfully verified.
if (loFtp.SslServerCertVerified) then
    ? "The server certificate was verified."
endif

llSuccess = loFtp.Disconnect()
if (llSuccess = .F.) then
    ? loFtp.LastErrorText
    release loFtp
    return
endif



release loFtp