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An FTP secure client library for C#

, 10 Dec 2008 CPOL 224.5K 9.1K 124
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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

 
GeneralDuring PASV I get: 500 You need to use a client supporting PRET (PRE Transfer) to use PASV Pin
AndreasLink14-Nov-09 4:56
memberAndreasLink14-Nov-09 4:56 
GeneralRe: During PASV I get: 500 You need to use a client supporting PRET (PRE Transfer) to use PASV Pin
AndreasLink14-Nov-09 5:23
memberAndreasLink14-Nov-09 5:23 
GeneralCode hangs up on readReply() Pin
Ericc196928-Oct-09 16:57
memberEricc196928-Oct-09 16:57 
GeneralRe: Code hangs up on readReply() Pin
AndreasLink14-Nov-09 5:00
memberAndreasLink14-Nov-09 5:00 
GeneralRe: Code hangs up on readReply() Pin
Member 3728808-Dec-09 10:54
memberMember 3728808-Dec-09 10:54 
GeneralRe: Code hangs up on readReply() Pin
MagicPT13-Jan-10 7:46
memberMagicPT13-Jan-10 7:46 
GeneralRe: Code hangs up on readReply() [modified] Pin
Silve_X18-Jul-10 0:52
memberSilve_X18-Jul-10 0:52 
GeneralError on port=990 Pin
Sameera Homa25-Sep-09 10:37
memberSameera Homa25-Sep-09 10:37 
Hi,

I am getting error at

IPEndPoint ep = new IPEndPoint(serverHostEntry.AddressList[0], remotePort);
try
{
clientSocket.Connect(ep);
}

as "A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 000.0.000.000:990"

I get above error when i use remortPort=990.

When I changed remortPort=21 it got connected to socket, but getting error in getSslStream(Socket Csocket)

_sslStream.AuthenticateAsClient(
remoteHost,
null,
System.Security.Authentication.SslProtocols.Ssl3 | System.Security.Authentication.SslProtocols.Tls,
true);

Do you have any solution to make it work with port=990.

Thanks in advance.



"Unable to read data from the transport connection: A non-blocking socket operation could not be completed immediately."

hi

GeneralRe: Error on port=990 Pin
kadaoui el mehdi25-Sep-09 10:46
memberkadaoui el mehdi25-Sep-09 10:46 
GeneralRe: Error on port=990 Pin
Sameera Homa25-Sep-09 11:02
memberSameera Homa25-Sep-09 11:02 
GeneralRe: Error on port=990 Pin
kadaoui el mehdi25-Sep-09 11:04
memberkadaoui el mehdi25-Sep-09 11:04 
GeneralRe: Error on port=990 Pin
SonnyDude13-Jul-10 22:13
memberSonnyDude13-Jul-10 22:13 
GeneralRe: Error on port=990 Pin
mendick200016-Nov-10 5:49
membermendick200016-Nov-10 5:49 
GeneralRe: Error on port=990 Pin
maximus.dec.meridius9-Mar-11 6:11
membermaximus.dec.meridius9-Mar-11 6:11 
Answer(Solution) The code hang on the function AuthenticateAsClient of the data stream. Pin
sonnguyen7917-Jul-09 13:48
membersonnguyen7917-Jul-09 13:48 
GeneralRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. Pin
Kris Munroe22-Sep-09 9:13
memberKris Munroe22-Sep-09 9:13 
AnswerRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. Pin
Jonathan.wilkins28-Jan-10 22:37
memberJonathan.wilkins28-Jan-10 22:37 
GeneralRe: (Solution) The code hang on the function AuthenticateAsClient of the data stream. Pin
Member 383304120-Oct-09 13:16
memberMember 383304120-Oct-09 13:16 
QuestionUsing the lib to connect a non secure ftp server Pin
david_864015-Jul-09 3:33
memberdavid_864015-Jul-09 3:33 
QuestionFTP Client and Server Pin
aschreiber25-Jun-09 14:10
memberaschreiber25-Jun-09 14:10 
GeneralNotImplementedException Pin
SimpleData6-May-09 3:10
memberSimpleData6-May-09 3:10 
GeneralExplicit mode Pin
adhager21-Apr-09 19:16
memberadhager21-Apr-09 19:16 
GeneralRe: Explicit mode Pin
kadaoui el mehdi5-May-09 4:00
memberkadaoui el mehdi5-May-09 4:00 
GeneralNo welcome message received Pin
optionj8515-Apr-09 2:52
memberoptionj8515-Apr-09 2:52 
GeneralRe: No welcome message received Pin
kadaoui el mehdi17-Apr-09 0:17
memberkadaoui el mehdi17-Apr-09 0:17 

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