(SQL Server) FTP Connect, Examine Server Certificate, and then Authenticate

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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes Chilkat Ftp2 to have been previously unlocked.
    -- See Unlock Ftp2 for sample code.

    DECLARE @ftp int
    -- Use "Chilkat_9_5_0.Ftp2" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Ftp2', @ftp OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @ftp, 'Hostname', 'www.authtls-ftps-server.com'
    EXEC sp_OASetProperty @ftp, 'Username', 'FTP_LOGIN'
    EXEC sp_OASetProperty @ftp, 'Password', 'FTP_PASSWORD'
    EXEC sp_OASetProperty @ftp, 'AuthTls', 1
    EXEC sp_OASetProperty @ftp, 'Port', 21

    -- Connect to the FTP server using explicit TLS (AUTH TLS).
    DECLARE @success int
    EXEC sp_OAMethod @ftp, 'ConnectOnly', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ftp
        RETURN
      END

    -- Get the FTP server's certificate.
    DECLARE @serverCert int
    EXEC sp_OAMethod @ftp, 'GetSslServerCert', @serverCert OUT
    EXEC sp_OAGetProperty @ftp, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @ftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ftp
        RETURN
      END

    -- 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.
    EXEC sp_OAMethod @ftp, 'LoginAfterConnectOnly', @success OUT
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @ftp, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @ftp
        RETURN
      END

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

    EXEC sp_OAMethod @ftp, 'Disconnect', @success OUT

    PRINT 'Success.'

    EXEC @hr = sp_OADestroy @ftp


END
GO