1 // Transport Security Layer (TLS)
2 // Copyright (c) 2003-2004 Carlos Guzman Alvarez
3 // Copyright (C) 2006 Novell, Inc (http://www.novell.com)
5 // Permission is hereby granted, free of charge, to any person obtaining
6 // a copy of this software and associated documentation files (the
7 // "Software"), to deal in the Software without restriction, including
8 // without limitation the rights to use, copy, modify, merge, publish,
9 // distribute, sublicense, and/or sell copies of the Software, and to
10 // permit persons to whom the Software is furnished to do so, subject to
11 // the following conditions:
13 // The above copyright notice and this permission notice shall be
14 // included in all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 using System
.Security
.Cryptography
;
28 namespace Mono
.Security
.Protocol
.Tls
.Handshake
.Server
30 internal class TlsClientHello
: HandshakeMessage
32 #region Private Fields
34 private byte[] random
;
35 private byte[] sessionId
;
36 private short[] cipherSuites
;
37 private byte[] compressionMethods
;
43 public TlsClientHello(Context context
, byte[] buffer
)
44 : base(context
, HandshakeType
.ClientHello
, buffer
)
52 public override void Update()
56 this.selectCipherSuite();
57 this.selectCompressionMethod();
59 this.Context
.SessionId
= this.sessionId
;
60 this.Context
.ClientRandom
= this.random
;
61 this.Context
.ProtocolNegotiated
= true;
66 #region Protected Methods
68 protected override void ProcessAsSsl3()
73 protected override void ProcessAsTls1()
76 this.processProtocol(this.ReadInt16());
78 // Random bytes - Unix time + Radom bytes [28]
79 this.random
= this.ReadBytes(32);
82 // Send the session ID empty
83 this.sessionId
= this.ReadBytes(this.ReadByte());
85 // Read Supported Cipher Suites count
86 this.cipherSuites
= new short[this.ReadInt16()/2];
89 for (int i
= 0; i
< this.cipherSuites
.Length
; i
++)
91 this.cipherSuites
[i
] = this.ReadInt16();
94 // Compression methods length
95 this.compressionMethods
= new byte[this.ReadByte()];
97 for (int i
= 0; i
< this.compressionMethods
.Length
; i
++)
99 this.compressionMethods
[i
] = this.ReadByte();
105 #region Private Methods
107 private void processProtocol(short protocol
)
109 SecurityProtocolType clientProtocol
= this.Context
.DecodeProtocolCode(protocol
);
111 if ((clientProtocol
& this.Context
.SecurityProtocolFlags
) == clientProtocol
||
112 (this.Context
.SecurityProtocolFlags
& SecurityProtocolType
.Default
) == SecurityProtocolType
.Default
)
114 this.Context
.SecurityProtocol
= clientProtocol
;
115 this.Context
.SupportedCiphers
.Clear();
116 this.Context
.SupportedCiphers
= null;
117 this.Context
.SupportedCiphers
= CipherSuiteFactory
.GetSupportedCiphers(clientProtocol
);
121 throw new TlsException(AlertDescription
.ProtocolVersion
, "Incorrect protocol version received from server");
125 private void selectCipherSuite()
129 for (int i
= 0; i
< this.cipherSuites
.Length
; i
++)
131 if ((index
= this.Context
.SupportedCiphers
.IndexOf(this.cipherSuites
[i
])) != -1)
133 this.Context
.Negotiating
.Cipher
= this.Context
.SupportedCiphers
[index
];
138 if (this.Context
.Negotiating
.Cipher
== null)
140 throw new TlsException(AlertDescription
.InsuficientSecurity
, "Insuficient Security");
144 private void selectCompressionMethod()
146 this.Context
.CompressionMethod
= SecurityCompressionType
.None
;