ftp: Add no_check_certificate option for FTPS

backend/ftp/ftp.go

@@ -49,13 +49,18 @@ func init() {
 				Required:   true,
 			}, {
 				Name:    "tls",
-				Help:    "Use FTP over TLS, leave blank for (false)",
+				Help:    "Use FTP over TLS (Implicit)",
 				Default: false,
 			}, {
 				Name:     "concurrency",
 				Help:     "Maximum number of FTP simultaneous connections, 0 for unlimited",
 				Default:  0,
 				Advanced: true,
+			}, {
+				Name:     "no_check_certificate",
+				Help:     "Do not verify the TLS certificate of the server",
+				Default:  false,
+				Advanced: true,
 			},
 		},
 	})
@@ -69,6 +74,7 @@ type Options struct {
 	Port              string `config:"port"`
 	TLS               bool   `config:"tls"`
 	Concurrency       int    `config:"concurrency"`
+	SkipVerifyTLSCert bool   `config:"no_check_certificate"`
 }
 
 // Fs represents a remote FTP server
@@ -130,6 +136,7 @@ func (f *Fs) ftpConnection() (*ftp.ServerConn, error) {
 	if f.opt.TLS {
 		tlsConfig := &tls.Config{
 			ServerName:         f.opt.Host,
+			InsecureSkipVerify: f.opt.SkipVerifyTLSCert,
 		}
 		ftpConfig = append(ftpConfig, ftp.DialWithTLS(tlsConfig))
 	}