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412
Esiur/Net/Packets/IIPAuthPacket.cs
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412
Esiur/Net/Packets/IIPAuthPacket.cs
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/*
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Copyright (c) 2017 Ahmed Kh. Zamil
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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using Esiur.Data;
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using Esiur.Security.Authority;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using System.Threading.Tasks;
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namespace Esiur.Net.Packets
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{
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class IIPAuthPacket : Packet
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{
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public enum IIPAuthPacketCommand : byte
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{
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Action = 0,
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Declare,
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Acknowledge,
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Error,
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}
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public enum IIPAuthPacketAction : byte
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{
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// Authenticate
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AuthenticateHash,
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//Challenge,
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//CertificateRequest,
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//CertificateReply,
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//EstablishRequest,
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//EstablishReply
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NewConnection = 0x20,
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ResumeConnection,
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ConnectionEstablished = 0x28
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}
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public IIPAuthPacketCommand Command
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{
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get;
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set;
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}
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public IIPAuthPacketAction Action
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{
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get;
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set;
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}
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public byte ErrorCode { get; set; }
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public string ErrorMessage { get; set; }
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public AuthenticationMethod LocalMethod
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{
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get;
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set;
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}
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public byte[] SourceInfo
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{
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get;
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set;
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}
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public byte[] Hash
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{
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get;
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set;
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}
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public byte[] SessionId
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{
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get;
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set;
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}
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public AuthenticationMethod RemoteMethod
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{
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get;
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set;
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}
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public string Domain
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{
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get;
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set;
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}
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public long CertificateId
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{
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get; set;
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}
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public string LocalUsername
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{
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get;
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set;
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}
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public string RemoteUsername
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{
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get;
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set;
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}
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public byte[] LocalPassword
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{
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get;
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set;
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}
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public byte[] RemotePassword
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{
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get;
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set;
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}
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public byte[] LocalToken
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{
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get;
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set;
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}
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public byte[] RemoteToken
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{
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get;
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set;
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}
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public byte[] AsymetricEncryptionKey
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{
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get;
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set;
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}
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public byte[] LocalNonce
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{
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get;
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set;
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}
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public byte[] RemoteNonce
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{
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get;
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set;
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}
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public ulong RemoteTokenIndex { get; set; }
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private uint dataLengthNeeded;
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bool NotEnough(uint offset, uint ends, uint needed)
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{
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if (offset + needed > ends)
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{
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dataLengthNeeded = needed - (ends - offset);
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return true;
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}
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else
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return false;
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}
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public override string ToString()
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{
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return Command.ToString() + " " + Action.ToString();
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}
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public override long Parse(byte[] data, uint offset, uint ends)
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{
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var oOffset = offset;
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if (NotEnough(offset, ends, 1))
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return -dataLengthNeeded;
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Command = (IIPAuthPacketCommand)(data[offset] >> 6);
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if (Command == IIPAuthPacketCommand.Action)
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{
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Action = (IIPAuthPacketAction)(data[offset++] & 0x3f);
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if (Action == IIPAuthPacketAction.AuthenticateHash)
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{
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if (NotEnough(offset, ends, 32))
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return -dataLengthNeeded;
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Hash = data.Clip(offset, 32);
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//var hash = new byte[32];
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//Buffer.BlockCopy(data, (int)offset, hash, 0, 32);
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//Hash = hash;
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offset += 32;
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}
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else if (Action == IIPAuthPacketAction.NewConnection)
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{
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if (NotEnough(offset, ends, 2))
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return -dataLengthNeeded;
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var length = data.GetUInt16(offset);
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offset += 2;
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if (NotEnough(offset, ends, length))
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return -dataLengthNeeded;
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SourceInfo = data.Clip(offset, length);
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//var sourceInfo = new byte[length];
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//Buffer.BlockCopy(data, (int)offset, sourceInfo, 0, length);
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//SourceInfo = sourceInfo;
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offset += 32;
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}
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else if (Action == IIPAuthPacketAction.ResumeConnection
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|| Action == IIPAuthPacketAction.ConnectionEstablished)
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{
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//var sessionId = new byte[32];
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if (NotEnough(offset, ends, 32))
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return -dataLengthNeeded;
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SessionId = data.Clip(offset, 32);
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//Buffer.BlockCopy(data, (int)offset, sessionId, 0, 32);
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//SessionId = sessionId;
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offset += 32;
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}
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}
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else if (Command == IIPAuthPacketCommand.Declare)
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{
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RemoteMethod = (AuthenticationMethod)((data[offset] >> 4) & 0x3);
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LocalMethod = (AuthenticationMethod)((data[offset] >> 2) & 0x3);
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var encrypt = ((data[offset++] & 0x2) == 0x2);
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if (NotEnough(offset, ends, 1))
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return -dataLengthNeeded;
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var domainLength = data[offset++];
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if (NotEnough(offset, ends, domainLength))
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return -dataLengthNeeded;
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var domain = data.GetString(offset, domainLength);
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Domain = domain;
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offset += domainLength;
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if (RemoteMethod == AuthenticationMethod.Credentials)
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{
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if (LocalMethod == AuthenticationMethod.None)
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{
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if (NotEnough(offset, ends, 33))
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return -dataLengthNeeded;
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//var remoteNonce = new byte[32];
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//Buffer.BlockCopy(data, (int)offset, remoteNonce, 0, 32);
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//RemoteNonce = remoteNonce;
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RemoteNonce = data.Clip(offset, 32);
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offset += 32;
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var length = data[offset++];
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if (NotEnough(offset, ends, length))
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return -dataLengthNeeded;
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RemoteUsername = data.GetString(offset, length);
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offset += length;
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}
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}
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else if (RemoteMethod == AuthenticationMethod.Token)
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{
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if (LocalMethod == AuthenticationMethod.None)
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{
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if (NotEnough(offset, ends, 37))
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return -dataLengthNeeded;
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RemoteNonce = data.Clip(offset, 32);
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offset += 32;
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RemoteTokenIndex = data.GetUInt64(offset);
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offset += 8;
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}
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}
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if (encrypt)
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{
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if (NotEnough(offset, ends, 2))
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return -dataLengthNeeded;
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var keyLength = data.GetUInt16(offset);
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offset += 2;
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if (NotEnough(offset, ends, keyLength))
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return -dataLengthNeeded;
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//var key = new byte[keyLength];
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//Buffer.BlockCopy(data, (int)offset, key, 0, keyLength);
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//AsymetricEncryptionKey = key;
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AsymetricEncryptionKey = data.Clip(offset, keyLength);
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offset += keyLength;
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}
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}
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else if (Command == IIPAuthPacketCommand.Acknowledge)
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{
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RemoteMethod = (AuthenticationMethod)((data[offset] >> 4) & 0x3);
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LocalMethod = (AuthenticationMethod)((data[offset] >> 2) & 0x3);
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var encrypt = ((data[offset++] & 0x2) == 0x2);
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if (NotEnough(offset, ends, 1))
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return -dataLengthNeeded;
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if (RemoteMethod == AuthenticationMethod.Credentials
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|| RemoteMethod == AuthenticationMethod.Token)
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{
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if (LocalMethod == AuthenticationMethod.None)
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{
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if (NotEnough(offset, ends, 32))
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return -dataLengthNeeded;
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RemoteNonce = data.Clip(offset, 32);
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offset += 32;
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}
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}
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if (encrypt)
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{
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if (NotEnough(offset, ends, 2))
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return -dataLengthNeeded;
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var keyLength = data.GetUInt16(offset);
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offset += 2;
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if (NotEnough(offset, ends, keyLength))
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return -dataLengthNeeded;
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//var key = new byte[keyLength];
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//Buffer.BlockCopy(data, (int)offset, key, 0, keyLength);
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//AsymetricEncryptionKey = key;
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AsymetricEncryptionKey = data.Clip(offset, keyLength);
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offset += keyLength;
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}
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}
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else if (Command == IIPAuthPacketCommand.Error)
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{
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if (NotEnough(offset, ends, 4))
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return -dataLengthNeeded;
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offset++;
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ErrorCode = data[offset++];
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var cl = data.GetUInt16(offset);
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offset += 2;
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if (NotEnough(offset, ends, cl))
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return -dataLengthNeeded;
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ErrorMessage = data.GetString(offset, cl);
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offset += cl;
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}
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return offset - oOffset;
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}
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}
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}
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