SSH.NET

SSH.NET

SSH.NET is a Secure Shell (SSH-2) library for .NET, optimized for parallelism.

Introduction

This project was inspired by Sharp.SSH library which was ported from java and it seems like was not supported for quite some time. This library is a complete rewrite, without any third party dependencies, using parallelism to achieve the best performance possible.

Features

• Execution of SSH command using both synchronous and asynchronous methods
• Return command execution exit status and other information
• Provide SFTP functionality for both synchronous and asynchronous operations
• Provides SCP functionality
• Provide status report for upload and download sftp operations to allow accurate progress bar implementation
• Remote, dynamic and local port forwarding
• Shell/Terminal implementation
• Specify key file pass phrase
• Use multiple key files to authenticate
• Supports publickey, password and keyboard-interactive authentication methods
• Supports two-factor or higher authentication
• Supports SOCKS4, SOCKS5 and HTTP Proxy

Encryption Method

SSH.NET supports the following encryption methods:

• aes256-ctr
• 3des-cbc
• aes128-cbc
• aes192-cbc
• aes256-cbc
• blowfish-cbc
• twofish-cbc
• twofish192-cbc
• twofish128-cbc
• twofish256-cbc
• arcfour
• arcfour128
• arcfour256
• cast128-cbc
• aes128-ctr
• aes192-ctr

Key Exchange Method

SSH.NET supports the following key exchange methods:

• curve25519-sha256
• curve25519-sha256@libssh.org
• ecdh-sha2-nistp256
• ecdh-sha2-nistp384
• ecdh-sha2-nistp521
• diffie-hellman-group-exchange-sha256
• diffie-hellman-group-exchange-sha1
• diffie-hellman-group14-sha1
• diffie-hellman-group1-sha1

Public Key Authenntication

SSH.NET supports the following private key formats:

• RSA in OpenSSL PEM and ssh.com format
• DSA in OpenSSL PEM and ssh.com format
• ECDSA 256/384/521 in OpenSSL PEM format
• ED25519 in OpenSSH key format

Private keys can be encrypted using one of the following cipher methods:

• DES-EDE3-CBC
• DES-EDE3-CFB
• DES-CBC
• AES-128-CBC
• AES-192-CBC
• AES-256-CBC

Host Key Algorithms

SSH.NET supports the following host key algorithms:

• ssh-ed25519
• ecdsa-sha2-nistp256
• ecdsa-sha2-nistp384
• ecdsa-sha2-nistp521
• ssh-rsa
• ssh-dss

Message Authentication Code

SSH.NET supports the following MAC algorithms:

• hmac-md5
• hmac-md5-96
• hmac-sha1
• hmac-sha1-96
• hmac-sha2-256
• hmac-sha2-256-96
• hmac-sha2-512
• hmac-sha2-512-96
• hmac-ripemd160
• hmac-ripemd160@openssh.com

Framework Support

SSH.NET supports the following target frameworks:

• .NET Framework 3.5
• .NET Framework 4.0 (and higher)
• .NET Standard 1.3
• Silverlight 4
• Silverlight 5
• Windows Phone 7.1
• Windows Phone 8.0
• Universal Windows Platform 10

Usage

Multi-factor authentication

Establish a SFTP connection using both password and public-key authentication:

var connectionInfo = new ConnectionInfo("sftp.foo.com",
                                        "guest",
                                        new PasswordAuthenticationMethod("guest", "pwd"),
                                        new PrivateKeyAuthenticationMethod("rsa.key"));
using (var client = new SftpClient(connectionInfo))
{
    client.Connect();
}

Verify host identify

Establish a SSH connection using user name and password, and reject the connection if the fingerprint of the server does not match the expected fingerprint:

byte[] expectedFingerPrint = new byte[] {
                                            0x66, 0x31, 0xaf, 0x00, 0x54, 0xb9, 0x87, 0x31,
                                            0xff, 0x58, 0x1c, 0x31, 0xb1, 0xa2, 0x4c, 0x6b
                                        };

using (var client = new SshClient("sftp.foo.com", "guest", "pwd"))
{
    client.HostKeyReceived += (sender, e) =>
        {
            if (expectedFingerPrint.Length == e.FingerPrint.Length)
            {
                for (var i = 0; i < expectedFingerPrint.Length; i++)
                {
                    if (expectedFingerPrint[i] != e.FingerPrint[i])
                    {
                        e.CanTrust = false;
                        break;
                    }
                }
            }
            else
            {
                e.CanTrust = false;
            }
        };
    client.Connect();
}

Building SSH.NET

Software	net35	net40	netstandard1.3	sl4	sl5	wp71	wp8	uap10.0
Windows Phone SDK 8.0				x	x	x	x
Visual Studio 2012 Update 5	x	x		x	x	x	x
Visual Studio 2015 Update 3	x	x			x		x	x
Visual Studio 2017		x	x