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An FTP secure client library for C#

, 10 Dec 2008
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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

 
QuestionUpload File - Nothing Happens PinmemberSergio Marchetti22-Aug-11 12:04 
AnswerRe: Upload File - Nothing Happens PinmemberMember 76555695-Apr-12 10:56 
QuestionCannot Upload File Pinmemberluis hernandez11-Aug-11 9:20 
AnswerRe: Cannot Upload File PinmemberMember 76555695-Apr-12 10:56 
QuestionError: A non-blocking socket operation could not be completed immediately PinmemberbigMoey27-Jun-11 18:29 
GeneralI can not run this project. Pinmemberwertyk12-May-11 3:16 
GeneralRe: I can not run this project. Pinmemberkadaoui el mehdi12-May-11 6:24 
GeneralRe: I can not run this project. Pinmemberwertyk12-May-11 20:25 
I cannot connect WithoutUseron FTP SSL site, i write that:
            FTPFactory ftp = new FTPFactory();
 
            ftp.setDebug(true);
            ftp.setRemoteHost("ftps.server.com");
 
            ftp.setRemotePort(21);
            ftp.loginWithoutUser();
Where is a problem?
GeneralRe: I can not run this project. Pinmemberkadaoui el mehdi12-May-11 21:58 
QuestionError on ftp.loginWihtoutUser Pinmemberjayson pryde28-Oct-10 11:45 
AnswerRe: Error on ftp.loginWihtoutUser PinmembergyingLiow9-Apr-13 20:15 
GeneralOriginal FTPFactory.cs written by Jaimon Mathew. PinmemberJulianPo23-Nov-09 5:40 
General"An existing connection was forcibly closed by the remote host." [modified] PinmemberHoang dinh Trung18-Nov-09 21:43 
GeneralRe: "An existing connection was forcibly closed by the remote host." Pinmemberkadaoui el mehdi19-Nov-09 1:06 
GeneralRe: "An existing connection was forcibly closed by the remote host." PinmemberHoang dinh Trung19-Nov-09 19:37 
GeneralRe: "An existing connection was forcibly closed by the remote host." Pinmemberkadaoui el mehdi19-Nov-09 20:43 
GeneralRe: "An existing connection was forcibly closed by the remote host." PinmemberHoang dinh Trung21-Nov-09 4:21 
GeneralRe: "An existing connection was forcibly closed by the remote host." Pinmemberkadaoui el mehdi24-Nov-09 21:02 
GeneralRe: "An existing connection was forcibly closed by the remote host." Pinmembermdbaskaran30-Dec-09 9:55 
GeneralRe: "An existing connection was forcibly closed by the remote host." PinmemberSonnyDude13-Jul-10 21:11 
GeneralGetting a file listing returning odd characters Pinmemberhankgrav16-Nov-09 7:40 
GeneralRe: Getting a file listing returning odd characters Pinmemberkadaoui el mehdi16-Nov-09 9:20 
GeneralRe: Getting a file listing returning odd characters Pinmemberhankgrav16-Nov-09 9:26 
GeneralRe: Getting a file listing returning odd characters Pinmemberkadaoui el mehdi16-Nov-09 9:47 
GeneralRe: Getting a file listing returning odd characters Pinmemberhankgrav16-Nov-09 9:56 

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