139 lines
4.1 KiB
C#
139 lines
4.1 KiB
C#
// Transport Security Layer (TLS)
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// Copyright (c) 2003-2004 Carlos Guzman Alvarez
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Net;
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using System.Security.Cryptography;
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namespace Mono.Security.Protocol.Tls.Handshake.Client
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{
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internal class TlsClientHello : HandshakeMessage
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{
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#region Fields
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private byte[] random;
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#endregion
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#region Constructors
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public TlsClientHello(Context context)
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: base(context, HandshakeType.ClientHello)
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{
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}
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#endregion
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#region Methods
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public override void Update()
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{
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ClientContext context = (ClientContext)this.Context;
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base.Update();
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context.ClientRandom = random;
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context.ClientHelloProtocol = this.Context.Protocol;
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random = null;
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}
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#endregion
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#region Protected Methods
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protected override void ProcessAsSsl3()
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{
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// Client Version
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this.Write(this.Context.Protocol);
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// Random bytes - Unix time + Radom bytes [28]
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TlsStream clientRandom = new TlsStream();
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clientRandom.Write(this.Context.GetUnixTime());
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clientRandom.Write(this.Context.GetSecureRandomBytes(28));
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this.random = clientRandom.ToArray();
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clientRandom.Reset();
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this.Write(this.random);
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// Session id
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// Check if we have a cache session we could reuse
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this.Context.SessionId = ClientSessionCache.FromHost (this.Context.ClientSettings.TargetHost);
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if (this.Context.SessionId != null)
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{
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this.Write((byte)this.Context.SessionId.Length);
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if (this.Context.SessionId.Length > 0)
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{
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this.Write(this.Context.SessionId);
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}
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}
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else
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{
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this.Write((byte)0);
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}
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// Write length of Cipher suites
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this.Write((short)(this.Context.SupportedCiphers.Count*2));
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// Write Supported Cipher suites
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for (int i = 0; i < this.Context.SupportedCiphers.Count; i++)
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{
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this.Write((short)this.Context.SupportedCiphers[i].Code);
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}
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// Compression methods length
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this.Write((byte)1);
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// Compression methods ( 0 = none )
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this.Write((byte)this.Context.CompressionMethod);
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}
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protected override void ProcessAsTls1()
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{
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ProcessAsSsl3 ();
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// If applicable add the "server_name" extension to the hello message
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// http://www.ietf.org/rfc/rfc3546.txt
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string host = Context.ClientSettings.TargetHost;
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// Our TargetHost might be an address (not a host *name*) - see bug #8553
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// RFC3546 -> Literal IPv4 and IPv6 addresses are not permitted in "HostName".
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IPAddress addr;
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if (IPAddress.TryParse (host, out addr))
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return;
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TlsStream extensions = new TlsStream ();
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byte[] server_name = System.Text.Encoding.UTF8.GetBytes (host);
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extensions.Write ((short) 0x0000); // ExtensionType: server_name (0)
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extensions.Write ((short) (server_name.Length + 5)); // ServerNameList (length)
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extensions.Write ((short) (server_name.Length + 3)); // ServerName (length)
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extensions.Write ((byte) 0x00); // NameType: host_name (0)
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extensions.Write ((short) server_name.Length); // HostName (length)
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extensions.Write (server_name); // HostName (UTF8)
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this.Write ((short) extensions.Length);
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this.Write (extensions.ToArray ());
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}
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#endregion
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}
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} |