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ConnectionInfo.cs
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ConnectionInfo.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using Renci.SshNet.Abstractions;
using Renci.SshNet.Security;
using Renci.SshNet.Messages.Connection;
using Renci.SshNet.Common;
using Renci.SshNet.Messages.Authentication;
using Renci.SshNet.Security.Cryptography.Ciphers.Modes;
using Renci.SshNet.Security.Cryptography.Ciphers;
namespace Renci.SshNet
{
/// <summary>
/// Represents remote connection information class.
/// </summary>
/// <remarks>
/// This class is NOT thread-safe. Do not use the same <see cref="ConnectionInfo"/> with multiple
/// client instances.
/// </remarks>
public class ConnectionInfo : IConnectionInfoInternal
{
internal static int DefaultPort = 22;
/// <summary>
/// The default connection timeout.
/// </summary>
/// <value>
/// 30 seconds.
/// </value>
private static readonly TimeSpan DefaultTimeout = TimeSpan.FromSeconds(30);
/// <summary>
/// The default channel close timeout.
/// </summary>
/// <value>
/// 1 second.
/// </value>
private static readonly TimeSpan DefaultChannelCloseTimeout = TimeSpan.FromSeconds(1);
/// <summary>
/// Gets supported key exchange algorithms for this connection.
/// </summary>
public IDictionary<string, Type> KeyExchangeAlgorithms { get; private set; }
/// <summary>
/// Gets supported encryptions for this connection.
/// </summary>
public IDictionary<string, CipherInfo> Encryptions { get; private set; }
/// <summary>
/// Gets supported hash algorithms for this connection.
/// </summary>
public IDictionary<string, HashInfo> HmacAlgorithms { get; private set; }
/// <summary>
/// Gets supported host key algorithms for this connection.
/// </summary>
public IDictionary<string, Func<byte[], KeyHostAlgorithm>> HostKeyAlgorithms { get; private set; }
/// <summary>
/// Gets supported authentication methods for this connection.
/// </summary>
public IList<AuthenticationMethod> AuthenticationMethods { get; private set; }
/// <summary>
/// Gets supported compression algorithms for this connection.
/// </summary>
public IDictionary<string, Type> CompressionAlgorithms { get; private set; }
/// <summary>
/// Gets the supported channel requests for this connection.
/// </summary>
/// <value>
/// The supported channel requests for this connection.
/// </value>
public IDictionary<string, RequestInfo> ChannelRequests { get; private set; }
/// <summary>
/// Gets a value indicating whether connection is authenticated.
/// </summary>
/// <value>
/// <c>true</c> if connection is authenticated; otherwise, <c>false</c>.
/// </value>
public bool IsAuthenticated { get; private set; }
/// <summary>
/// Gets connection host.
/// </summary>
/// <value>
/// The connection host.
/// </value>
public string Host { get; private set; }
/// <summary>
/// Gets connection port.
/// </summary>
/// <value>
/// The connection port. The default value is 22.
/// </value>
public int Port { get; private set; }
/// <summary>
/// Gets connection username.
/// </summary>
public string Username { get; private set; }
/// <summary>
/// Gets proxy type.
/// </summary>
/// <value>
/// The type of the proxy.
/// </value>
public ProxyTypes ProxyType { get; private set; }
/// <summary>
/// Gets proxy connection host.
/// </summary>
public string ProxyHost { get; private set; }
/// <summary>
/// Gets proxy connection port.
/// </summary>
public int ProxyPort { get; private set; }
/// <summary>
/// Gets proxy connection username.
/// </summary>
public string ProxyUsername { get; private set; }
/// <summary>
/// Gets proxy connection password.
/// </summary>
public string ProxyPassword { get; private set; }
/// <summary>
/// Gets or sets connection timeout.
/// </summary>
/// <value>
/// The connection timeout. The default value is 30 seconds.
/// </value>
/// <example>
/// <code source="..\..\src\Renci.SshNet.Tests\Classes\SshClientTest.cs" region="Example SshClient Connect Timeout" language="C#" title="Specify connection timeout" />
/// </example>
public TimeSpan Timeout { get; set; }
/// <summary>
/// Gets or sets the timeout to use when waiting for a server to acknowledge closing a channel.
/// </summary>
/// <value>
/// The channel close timeout. The default value is 1 second.
/// </value>
/// <remarks>
/// If a server does not send a <c>SSH_MSG_CHANNEL_CLOSE</c> message before the specified timeout
/// elapses, the channel will be closed immediately.
/// </remarks>
public TimeSpan ChannelCloseTimeout { get; set; }
/// <summary>
/// Gets or sets the character encoding.
/// </summary>
/// <value>
/// The character encoding. The default is <see cref="System.Text.Encoding.UTF8"/>.
/// </value>
public Encoding Encoding { get; set; }
/// <summary>
/// Gets or sets number of retry attempts when session channel creation failed.
/// </summary>
/// <value>
/// The number of retry attempts when session channel creation failed. The default
/// value is 10.
/// </value>
public int RetryAttempts { get; set; }
/// <summary>
/// Gets or sets maximum number of session channels to be open simultaneously.
/// </summary>
/// <value>
/// The maximum number of session channels to be open simultaneously. The default
/// value is 10.
/// </value>
public int MaxSessions { get; set; }
/// <summary>
/// Occurs when authentication banner is sent by the server.
/// </summary>
/// <example>
/// <code source="..\..\src\Renci.SshNet.Tests\Classes\PasswordConnectionInfoTest.cs" region="Example PasswordConnectionInfo AuthenticationBanner" language="C#" title="Display authentication banner" />
/// </example>
public event EventHandler<AuthenticationBannerEventArgs> AuthenticationBanner;
/// <summary>
/// Gets the current key exchange algorithm.
/// </summary>
public string CurrentKeyExchangeAlgorithm { get; internal set; }
/// <summary>
/// Gets the current server encryption.
/// </summary>
public string CurrentServerEncryption { get; internal set; }
/// <summary>
/// Gets the current client encryption.
/// </summary>
public string CurrentClientEncryption { get; internal set; }
/// <summary>
/// Gets the current server hash algorithm.
/// </summary>
public string CurrentServerHmacAlgorithm { get; internal set; }
/// <summary>
/// Gets the current client hash algorithm.
/// </summary>
public string CurrentClientHmacAlgorithm { get; internal set; }
/// <summary>
/// Gets the current host key algorithm.
/// </summary>
public string CurrentHostKeyAlgorithm { get; internal set; }
/// <summary>
/// Gets the current server compression algorithm.
/// </summary>
public string CurrentServerCompressionAlgorithm { get; internal set; }
/// <summary>
/// Gets the server version.
/// </summary>
public string ServerVersion { get; internal set; }
/// <summary>
/// Get the client version.
/// </summary>
public string ClientVersion { get; internal set; }
/// <summary>
/// Gets the current client compression algorithm.
/// </summary>
public string CurrentClientCompressionAlgorithm { get; internal set; }
/// <summary>
/// Initializes a new instance of the <see cref="ConnectionInfo"/> class.
/// </summary>
/// <param name="host">The host.</param>
/// <param name="username">The username.</param>
/// <param name="authenticationMethods">The authentication methods.</param>
/// <exception cref="ArgumentNullException"><paramref name="host"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException"><paramref name="host"/> is a zero-length string.</exception>
/// <exception cref="ArgumentException"><paramref name="username" /> is <c>null</c>, a zero-length string or contains only whitespace characters.</exception>
/// <exception cref="ArgumentNullException"><paramref name="authenticationMethods"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException">No <paramref name="authenticationMethods"/> specified.</exception>
public ConnectionInfo(string host, string username, params AuthenticationMethod[] authenticationMethods)
: this(host, DefaultPort, username, ProxyTypes.None, null, 0, null, null, authenticationMethods)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ConnectionInfo"/> class.
/// </summary>
/// <param name="host">The host.</param>
/// <param name="port">The port.</param>
/// <param name="username">The username.</param>
/// <param name="authenticationMethods">The authentication methods.</param>
/// <exception cref="ArgumentNullException"><paramref name="host"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException"><paramref name="username" /> is <c>null</c>, a zero-length string or contains only whitespace characters.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="port" /> is not within <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
/// <exception cref="ArgumentNullException"><paramref name="authenticationMethods"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException">No <paramref name="authenticationMethods"/> specified.</exception>
public ConnectionInfo(string host, int port, string username, params AuthenticationMethod[] authenticationMethods)
: this(host, port, username, ProxyTypes.None, null, 0, null, null, authenticationMethods)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="ConnectionInfo" /> class.
/// </summary>
/// <param name="host">Connection host.</param>
/// <param name="port">Connection port.</param>
/// <param name="username">Connection username.</param>
/// <param name="proxyType">Type of the proxy.</param>
/// <param name="proxyHost">The proxy host.</param>
/// <param name="proxyPort">The proxy port.</param>
/// <param name="proxyUsername">The proxy username.</param>
/// <param name="proxyPassword">The proxy password.</param>
/// <param name="authenticationMethods">The authentication methods.</param>
/// <exception cref="ArgumentNullException"><paramref name="host"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException"><paramref name="username" /> is <c>null</c>, a zero-length string or contains only whitespace characters.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="port" /> is not within <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
/// <exception cref="ArgumentNullException"><paramref name="proxyType"/> is not <see cref="ProxyTypes.None"/> and <paramref name="proxyHost" /> is <c>null</c>.</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="proxyType"/> is not <see cref="ProxyTypes.None"/> and <paramref name="proxyPort" /> is not within <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
/// <exception cref="ArgumentNullException"><paramref name="authenticationMethods"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentException">No <paramref name="authenticationMethods"/> specified.</exception>
public ConnectionInfo(string host, int port, string username, ProxyTypes proxyType, string proxyHost, int proxyPort, string proxyUsername, string proxyPassword, params AuthenticationMethod[] authenticationMethods)
{
if (host == null)
throw new ArgumentNullException("host");
port.ValidatePort("port");
if (username == null)
throw new ArgumentNullException("username");
if (username.All(char.IsWhiteSpace))
throw new ArgumentException("Cannot be empty or contain only whitespace.", "username");
if (proxyType != ProxyTypes.None)
{
if (proxyHost == null)
throw new ArgumentNullException("proxyHost");
proxyPort.ValidatePort("proxyPort");
}
if (authenticationMethods == null)
throw new ArgumentNullException("authenticationMethods");
if (authenticationMethods.Length == 0)
throw new ArgumentException("At least one authentication method should be specified.", "authenticationMethods");
// Set default connection values
Timeout = DefaultTimeout;
ChannelCloseTimeout = DefaultChannelCloseTimeout;
RetryAttempts = 10;
MaxSessions = 10;
Encoding = Encoding.UTF8;
KeyExchangeAlgorithms = new Dictionary<string, Type>
{
{"curve25519-sha256", typeof(KeyExchangeECCurve25519)},
{"curve25519-sha256@libssh.org", typeof(KeyExchangeECCurve25519)},
{"ecdh-sha2-nistp256", typeof(KeyExchangeECDH256)},
{"ecdh-sha2-nistp384", typeof(KeyExchangeECDH384)},
{"ecdh-sha2-nistp521", typeof(KeyExchangeECDH521)},
{"diffie-hellman-group-exchange-sha256", typeof (KeyExchangeDiffieHellmanGroupExchangeSha256)},
{"diffie-hellman-group-exchange-sha1", typeof (KeyExchangeDiffieHellmanGroupExchangeSha1)},
{"diffie-hellman-group16-sha512", typeof(KeyExchangeDiffieHellmanGroup16Sha512)},
{"diffie-hellman-group14-sha256", typeof (KeyExchangeDiffieHellmanGroup14Sha256)},
{"diffie-hellman-group14-sha1", typeof (KeyExchangeDiffieHellmanGroup14Sha1)},
{"diffie-hellman-group1-sha1", typeof (KeyExchangeDiffieHellmanGroup1Sha1)},
};
Encryptions = new Dictionary<string, CipherInfo>
{
{"aes256-ctr", new CipherInfo(256, (key, iv) => new AesCipher(key, new CtrCipherMode(iv), null))},
{"3des-cbc", new CipherInfo(192, (key, iv) => new TripleDesCipher(key, new CbcCipherMode(iv), null))},
{"aes128-cbc", new CipherInfo(128, (key, iv) => new AesCipher(key, new CbcCipherMode(iv), null))},
{"aes192-cbc", new CipherInfo(192, (key, iv) => new AesCipher(key, new CbcCipherMode(iv), null))},
{"aes256-cbc", new CipherInfo(256, (key, iv) => new AesCipher(key, new CbcCipherMode(iv), null))},
{"blowfish-cbc", new CipherInfo(128, (key, iv) => new BlowfishCipher(key, new CbcCipherMode(iv), null))},
{"twofish-cbc", new CipherInfo(256, (key, iv) => new TwofishCipher(key, new CbcCipherMode(iv), null))},
{"twofish192-cbc", new CipherInfo(192, (key, iv) => new TwofishCipher(key, new CbcCipherMode(iv), null))},
{"twofish128-cbc", new CipherInfo(128, (key, iv) => new TwofishCipher(key, new CbcCipherMode(iv), null))},
{"twofish256-cbc", new CipherInfo(256, (key, iv) => new TwofishCipher(key, new CbcCipherMode(iv), null))},
////{"serpent256-cbc", typeof(CipherSerpent256CBC)},
////{"serpent192-cbc", typeof(...)},
////{"serpent128-cbc", typeof(...)},
{"arcfour", new CipherInfo(128, (key, iv) => new Arc4Cipher(key, false))},
{"arcfour128", new CipherInfo(128, (key, iv) => new Arc4Cipher(key, true))},
{"arcfour256", new CipherInfo(256, (key, iv) => new Arc4Cipher(key, true))},
////{"idea-cbc", typeof(...)},
{"cast128-cbc", new CipherInfo(128, (key, iv) => new CastCipher(key, new CbcCipherMode(iv), null))},
////{"rijndael-cbc@lysator.liu.se", typeof(...)},
{"aes128-ctr", new CipherInfo(128, (key, iv) => new AesCipher(key, new CtrCipherMode(iv), null))},
{"aes192-ctr", new CipherInfo(192, (key, iv) => new AesCipher(key, new CtrCipherMode(iv), null))},
};
HmacAlgorithms = new Dictionary<string, HashInfo>
{
{"hmac-md5", new HashInfo(16*8, CryptoAbstraction.CreateHMACMD5)},
{"hmac-md5-96", new HashInfo(16*8, key => CryptoAbstraction.CreateHMACMD5(key, 96))},
{"hmac-sha1", new HashInfo(20*8, CryptoAbstraction.CreateHMACSHA1)},
{"hmac-sha1-96", new HashInfo(20*8, key => CryptoAbstraction.CreateHMACSHA1(key, 96))},
{"hmac-sha2-256", new HashInfo(32*8, CryptoAbstraction.CreateHMACSHA256)},
{"hmac-sha2-256-96", new HashInfo(32*8, key => CryptoAbstraction.CreateHMACSHA256(key, 96))},
{"hmac-sha2-512", new HashInfo(64 * 8, CryptoAbstraction.CreateHMACSHA512)},
{"hmac-sha2-512-96", new HashInfo(64 * 8, key => CryptoAbstraction.CreateHMACSHA512(key, 96))},
//{"umac-64@openssh.com", typeof(HMacSha1)},
{"hmac-ripemd160", new HashInfo(160, CryptoAbstraction.CreateHMACRIPEMD160)},
{"hmac-ripemd160@openssh.com", new HashInfo(160, CryptoAbstraction.CreateHMACRIPEMD160)},
//{"none", typeof(...)},
};
HostKeyAlgorithms = new Dictionary<string, Func<byte[], KeyHostAlgorithm>>
{
{"ssh-ed25519", data => new KeyHostAlgorithm("ssh-ed25519", new ED25519Key(), data)},
#if FEATURE_ECDSA
{"ecdsa-sha2-nistp256", data => new KeyHostAlgorithm("ecdsa-sha2-nistp256", new EcdsaKey(), data)},
{"ecdsa-sha2-nistp384", data => new KeyHostAlgorithm("ecdsa-sha2-nistp384", new EcdsaKey(), data)},
{"ecdsa-sha2-nistp521", data => new KeyHostAlgorithm("ecdsa-sha2-nistp521", new EcdsaKey(), data)},
#endif
{"ssh-rsa", data => new KeyHostAlgorithm("ssh-rsa", new RsaKey(), data)},
{"ssh-dss", data => new KeyHostAlgorithm("ssh-dss", new DsaKey(), data)},
//{"x509v3-sign-rsa", () => { ... },
//{"x509v3-sign-dss", () => { ... },
//{"spki-sign-rsa", () => { ... },
//{"spki-sign-dss", () => { ... },
//{"pgp-sign-rsa", () => { ... },
//{"pgp-sign-dss", () => { ... },
};
CompressionAlgorithms = new Dictionary<string, Type>
{
//{"zlib@openssh.com", typeof(ZlibOpenSsh)},
//{"zlib", typeof(Zlib)},
{"none", null},
};
ChannelRequests = new Dictionary<string, RequestInfo>
{
{EnvironmentVariableRequestInfo.Name, new EnvironmentVariableRequestInfo()},
{ExecRequestInfo.Name, new ExecRequestInfo()},
{ExitSignalRequestInfo.Name, new ExitSignalRequestInfo()},
{ExitStatusRequestInfo.Name, new ExitStatusRequestInfo()},
{PseudoTerminalRequestInfo.Name, new PseudoTerminalRequestInfo()},
{ShellRequestInfo.Name, new ShellRequestInfo()},
{SignalRequestInfo.Name, new SignalRequestInfo()},
{SubsystemRequestInfo.Name, new SubsystemRequestInfo()},
{WindowChangeRequestInfo.Name, new WindowChangeRequestInfo()},
{X11ForwardingRequestInfo.Name, new X11ForwardingRequestInfo()},
{XonXoffRequestInfo.Name, new XonXoffRequestInfo()},
{EndOfWriteRequestInfo.Name, new EndOfWriteRequestInfo()},
{KeepAliveRequestInfo.Name, new KeepAliveRequestInfo()},
};
Host = host;
Port = port;
Username = username;
ProxyType = proxyType;
ProxyHost = proxyHost;
ProxyPort = proxyPort;
ProxyUsername = proxyUsername;
ProxyPassword = proxyPassword;
AuthenticationMethods = authenticationMethods;
}
/// <summary>
/// Authenticates the specified session.
/// </summary>
/// <param name="session">The session to be authenticated.</param>
/// <param name="serviceFactory">The factory to use for creating new services.</param>
/// <exception cref="ArgumentNullException"><paramref name="session"/> is <c>null</c>.</exception>
/// <exception cref="ArgumentNullException"><paramref name="serviceFactory"/> is <c>null</c>.</exception>
/// <exception cref="SshAuthenticationException">No suitable authentication method found to complete authentication, or permission denied.</exception>
internal void Authenticate(ISession session, IServiceFactory serviceFactory)
{
if (serviceFactory == null)
throw new ArgumentNullException("serviceFactory");
IsAuthenticated = false;
var clientAuthentication = serviceFactory.CreateClientAuthentication();
clientAuthentication.Authenticate(this, session);
IsAuthenticated = true;
}
/// <summary>
/// Signals that an authentication banner message was received from the server.
/// </summary>
/// <param name="sender">The session in which the banner message was received.</param>
/// <param name="e">The banner message.{</param>
void IConnectionInfoInternal.UserAuthenticationBannerReceived(object sender, MessageEventArgs<BannerMessage> e)
{
var authenticationBanner = AuthenticationBanner;
if (authenticationBanner != null)
{
authenticationBanner(this,
new AuthenticationBannerEventArgs(Username, e.Message.Message, e.Message.Language));
}
}
IAuthenticationMethod IConnectionInfoInternal.CreateNoneAuthenticationMethod()
{
return new NoneAuthenticationMethod(Username);
}
IList<IAuthenticationMethod> IConnectionInfoInternal.AuthenticationMethods
{
get { return AuthenticationMethods.Cast<IAuthenticationMethod>().ToList(); }
}
/// <summary>
/// Prioritises a specified algorithm
/// </summary>
public bool PrioritiseHostKeyAlgorithm(string algorithm)
{
var newOrderedAlgorithms = new Dictionary<string, Func<byte[], KeyHostAlgorithm>>();
if (HostKeyAlgorithms.ContainsKey(algorithm))
{
Func<byte[], KeyHostAlgorithm> value;
var found = HostKeyAlgorithms.TryGetValue(algorithm, out value);
if (found)
{
newOrderedAlgorithms.Add(algorithm, value);
HostKeyAlgorithms.Remove(algorithm);
foreach (var pair in HostKeyAlgorithms)
{
newOrderedAlgorithms.Add(pair.Key, pair.Value);
}
HostKeyAlgorithms = newOrderedAlgorithms;
return true;
}
}
return false;
}
/// <summary>
/// Limit the used algorithms to those allowed by FIPS.
/// </summary>
public void UseFipsMode()
{
var encryptionAlgorithms = new[] { "aes256-ctr", "aes256-cbc", "aes192-cbc", "aes128-cbc", "3des-cbc"};
var hmacAlgorithms = new[] {"hmac-sha2-256", "hmac-sha2-512", "hmac-sha1"};
var hostKeyAlgorithms = new[] {"ssh-dss", "ssh-rsa"};
var kexAlgorithms = new[]
{
"diffie-hellman-group-exchange-sha256",
"diffie-hellman-group-exchange-sha1",
"diffie-hellman-group14-sha1",
"diffie-hellman-group1-sha1"
};
foreach (var key in Encryptions.Keys.ToArray())
{
if (!encryptionAlgorithms.Contains(key))
{
Encryptions.Remove(key);
}
}
foreach (var key in HmacAlgorithms.Keys.ToArray())
{
if (!hmacAlgorithms.Contains(key))
{
HmacAlgorithms.Remove(key);
}
}
foreach (var key in HostKeyAlgorithms.Keys.ToArray())
{
if (!hostKeyAlgorithms.Contains(key))
{
HostKeyAlgorithms.Remove(key);
}
}
foreach (var key in KeyExchangeAlgorithms.Keys.ToArray())
{
if (!kexAlgorithms.Contains(key))
{
KeyExchangeAlgorithms.Remove(key);
}
}
}
}
}