103 lines
3.3 KiB
C#
103 lines
3.3 KiB
C#
// Transport Security Layer (TLS)
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// Copyright (c) 2003-2004 Carlos Guzman Alvarez
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// Copyright (C) 2006 Novell, Inc (http://www.novell.com)
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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.Security.Cryptography;
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using Mono.Security.Cryptography;
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namespace Mono.Security.Protocol.Tls.Handshake.Client
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{
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internal class TlsServerFinished : HandshakeMessage
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{
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#region Constructors
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public TlsServerFinished(Context context, byte[] buffer)
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: base(context, HandshakeType.Finished, buffer)
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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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base.Update();
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// Hahdshake is finished
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this.Context.HandshakeState = HandshakeState.Finished;
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}
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#endregion
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#region Protected Methods
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static private byte[] Ssl3Marker = new byte [4] { 0x53, 0x52, 0x56, 0x52 };
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protected override void ProcessAsSsl3()
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{
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// Compute handshake messages hashes
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HashAlgorithm hash = new SslHandshakeHash(this.Context.MasterSecret);
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byte[] data = this.Context.HandshakeMessages.ToArray ();
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hash.TransformBlock (data, 0, data.Length, data, 0);
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hash.TransformBlock (Ssl3Marker, 0, Ssl3Marker.Length, Ssl3Marker, 0);
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// hack to avoid memory allocation
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hash.TransformFinalBlock (CipherSuite.EmptyArray, 0, 0);
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byte[] serverHash = this.ReadBytes((int)Length);
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byte[] clientHash = hash.Hash;
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// Check server prf against client prf
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if (!Compare (clientHash, serverHash))
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{
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// TODO: Review that selected alert is correct
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throw new TlsException(AlertDescription.InsuficientSecurity, "Invalid ServerFinished message received.");
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}
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}
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protected override void ProcessAsTls1()
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{
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byte[] serverPRF = this.ReadBytes((int)Length);
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HashAlgorithm hash = new MD5SHA1();
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// note: we could call HashAlgorithm.ComputeHash(Stream) but that would allocate (on Mono)
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// a 4096 bytes buffer to process the hash - which is bigger than HandshakeMessages
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byte[] data = this.Context.HandshakeMessages.ToArray ();
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byte[] digest = hash.ComputeHash (data, 0, data.Length);
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byte[] clientPRF = this.Context.Current.Cipher.PRF(this.Context.MasterSecret, "server finished", digest, 12);
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// Check server prf against client prf
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if (!Compare (clientPRF, serverPRF))
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{
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throw new TlsException("Invalid ServerFinished message received.");
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}
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}
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#endregion
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}
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}
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