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An FTP secure client library for C#

, 10 Dec 2008 CPOL
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How to implement an FTP secure connection with an SSL stream class.

Introduction

The purpose of this article is to create a C # FTP client in Secure mode, so if you don’t have much knowledge of FTPS, I advise you to take a look at this: FTPS.

In the .NET Framework, to upload a file in FTPS mode, we generally use the FtpWebRequest class, but you can not send commands with « quote » arguments, and even if you search on the web, you will not find a concrete example of a secured C# FTP client.

It’s for those reasons I decided to create this article.

SSL Stream?

To send a socket in Secure Socket Layer (SSL) mode, we use the class System.Net.Security.SslStream.

Provides a stream used for client-server communication that uses the Secure Socket Layer (SSL) security protocol to authenticate the server and optionally the client”.

For more information, refer to MSDN.

Using the Code

1. Pre-Authenticate

FTPFactory ftp = new FTPFactory();
ftp.setDebug(true);
ftp.setRemoteHost(Settings.Default.TargetFtpSource);

//Connect to SSL Port (990)
ftp.setRemotePort(990);
ftp.loginWithoutUser();

//Send "AUTH SSL" Command
string cmd = "AUTH SSL";
ftp.sendCommand(cmd);

Before connecting to the FTP server in SSL mode, you have to define the 990 SSL port and send the « AUTH SSL » command authentication using SSL.

WelcomeFTPSecure.JPG

2. Create SSL Stream

//Create SSL Stream
ftp.getSslStream();
ftp.setUseStream(true);
//Login to FTP Secure
ftp.setRemoteUser(Settings.Default.TargetFtpSecureUser);
ftp.setRemotePass(Settings.Default.TargetFtpSecurePass);
ftp.login();

ftp.getSslStream() creates an SSL stream from client socket which will be used for exchange between the client and the server FTPS. Then, you have to enter a login and password to authenticate on the FTPS server.

Note: if the SSL stream is well established, then I display all the information about the server certificate.

CertificatInfos.JPG

3. Upload File

//Set ASCII Mode
ftp.setBinaryMode(false);

//Send Arguments if you want
//cmd = "site arg1 arg2";
//ftp.sendCommand(cmd);

//Upload file
ftp.uploadSecure(@"Filepath", false);

ftp.close();

Before uploading a file, you have to specify the mode: ftp.setBinaryMode(bool value).

  • value is false --> ASCII mode
  • value is true --> Binary mode

By default, it’s binary. Now, you upload the file using:

ftp.uploadSecure(@"Filepath", false)

Note: you can upload in non secured mode using ftp.upload().

Points of Interest

I learned how an SSL stream and the RAW FTP communication works between a client and an FTP server. Searching on the web, I found many who were stuck on the issue of SSL communication with an FTP server, so I hope this article will be of great help.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

kadaoui el mehdi
Architect
Belgium Belgium
in 2005, I started my career. Net and I could improve in this technology through the project WinFroms. Net 2.0 / MVC2 for "Nestle".

After obtaining my diploma MASTER "MBDS" from the University of Nice Sophia Anti-police, I left to Belguim to work as Expert .Net Analyst Developer.

Currently I specialize in architecture Asp.net to the lowest level.

Meanwhile I remain very active in the community. Net, I created the 1st community. Net Morocco "on Facebook and LinkedIn and twitter, called "Morocco .Net User Group (MONUG)"

Comments and Discussions

 
GeneralRe: Code hangs up on readReply() PinmemberMember 3728808-Dec-09 9:54 
GeneralRe: Code hangs up on readReply() PinmemberMagicPT13-Jan-10 6:46 
GeneralRe: Code hangs up on readReply() [modified] PinmemberSilve_X17-Jul-10 23:52 
GeneralError on port=990 PinmemberSameera Homa25-Sep-09 9:37 
GeneralRe: Error on port=990 Pinmemberkadaoui el mehdi25-Sep-09 9:46 
GeneralRe: Error on port=990 PinmemberSameera Homa25-Sep-09 10:02 
GeneralRe: Error on port=990 Pinmemberkadaoui el mehdi25-Sep-09 10:04 
GeneralRe: Error on port=990 PinmemberSonnyDude13-Jul-10 21:13 
GeneralRe: Error on port=990 Pinmembermendick200016-Nov-10 4:49 
GeneralRe: Error on port=990 Pinmembermaximus.dec.meridius9-Mar-11 5:11 
Answer(Solution) The code hang on the function AuthenticateAsClient of the data stream. Pinmembersonnguyen7917-Jul-09 12:48 
GeneralRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. PinmemberKris Munroe22-Sep-09 8:13 
AnswerRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. PinmemberJonathan.wilkins28-Jan-10 21:37 
GeneralRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. PinmemberMember 383304120-Oct-09 12:16 
QuestionUsing the lib to connect a non secure ftp server Pinmemberdavid_864015-Jul-09 2:33 
QuestionFTP Client and Server Pinmemberaschreiber25-Jun-09 13:10 
GeneralNotImplementedException PinmemberSimpleData6-May-09 2:10 
GeneralExplicit mode Pinmemberadhager21-Apr-09 18:16 
GeneralRe: Explicit mode Pinmemberkadaoui el mehdi5-May-09 3:00 
GeneralNo welcome message received Pinmemberoptionj8515-Apr-09 1:52 
GeneralRe: No welcome message received Pinmemberkadaoui el mehdi16-Apr-09 23:17 
GeneralRe: No welcome message received Pinmemberoptionj8517-Apr-09 1:11 
GeneralRe: No welcome message received Pinmemberkadaoui el mehdi17-Apr-09 2:26 
GeneralRe: No welcome message received Pinmemberoptionj8517-Apr-09 3:05 
GeneralRe: No welcome message received PinmemberdesarrolloJL13-Sep-10 6:37 

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