/* Copyright (c) 2017 Ahmed Kh. Zamil Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ using Esiur.Data; using Esiur.Security.Authority; using System; using System.Collections.Generic; using System.ComponentModel.DataAnnotations; using System.Data.Common; using System.Linq; using System.Security.Cryptography; using System.Text; using System.Threading.Tasks; using System.Timers; namespace Esiur.Net.Packets; public class IIPAuthPacket : Packet { public IIPAuthPacketCommand Command { get; set; } public IIPAuthPacketInitialize Initialization { get; set; } public IIPAuthPacketAcknowledge Acknowledgement { get; set; } public IIPAuthPacketAction Action { get; set; } public IIPAuthPacketEvent Event { get; set; } public AuthenticationMethod LocalMethod { get; set; } public AuthenticationMethod RemoteMethod { get; set; } public byte ErrorCode { get; set; } public string Message { get; set; } public IIPAuthPacketPublicKeyAlgorithm PublicKeyAlgorithm { get; set; } public IIPAuthPacketHashAlgorithm HashAlgorithm { get; set; } public byte[] Certificate { get; set; } public byte[] Challenge { get; set; } public byte[] AsymetricEncryptionKey { get; set; } public byte[] SessionId { get; set; } public byte[] AccountId { get; set; } public TransmissionType? DataType { get; set; } // IAuth Reference public uint Reference { get; set; } private uint dataLengthNeeded; bool NotEnough(uint offset, uint ends, uint needed) { if (offset + needed > ends) { dataLengthNeeded = needed - (ends - offset); return true; } else return false; } public override string ToString() { return Command.ToString() + " " + Action.ToString(); } public override long Parse(byte[] data, uint offset, uint ends) { var oOffset = offset; if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; Command = (IIPAuthPacketCommand)(data[offset] >> 6); if (Command == IIPAuthPacketCommand.Initialize) { LocalMethod = (AuthenticationMethod)(data[offset] >> 4 & 0x3); RemoteMethod = (AuthenticationMethod)(data[offset] >> 2 & 0x3); Initialization = (IIPAuthPacketInitialize)(data[offset++] & 0xFC); // remove last two reserved LSBs if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; (var size, DataType) = TransmissionType.Parse(data, offset, ends); if (DataType == null) return -(int)size; offset += (uint)size; } else if (Command == IIPAuthPacketCommand.Acknowledge) { LocalMethod = (AuthenticationMethod)(data[offset] >> 4 & 0x3); RemoteMethod = (AuthenticationMethod)(data[offset] >> 2 & 0x3); Acknowledgement = (IIPAuthPacketAcknowledge)(data[offset++] & 0xFC); // remove last two reserved LSBs if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; (var size, DataType) = TransmissionType.Parse(data, offset, ends); if (DataType == null) return -(int)size; offset += (uint)size; } else if (Command == IIPAuthPacketCommand.Action) { Action = (IIPAuthPacketAction)data[offset++]; // (IIPAuthPacketAction)(data[offset++] & 0x3f); if (Action == IIPAuthPacketAction.AuthenticateHash || Action == IIPAuthPacketAction.AuthenticatePublicHash || Action == IIPAuthPacketAction.AuthenticatePrivateHash || Action == IIPAuthPacketAction.AuthenticatePublicPrivateHash) { if (NotEnough(offset, ends, 3)) return -dataLengthNeeded; HashAlgorithm = (IIPAuthPacketHashAlgorithm)data[offset++]; var hashLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, hashLength)) return -dataLengthNeeded; Challenge = data.Clip(offset, hashLength); offset += hashLength; } else if (Action == IIPAuthPacketAction.AuthenticatePrivateHashCert || Action == IIPAuthPacketAction.AuthenticatePublicPrivateHashCert) { if (NotEnough(offset, ends, 3)) return -dataLengthNeeded; HashAlgorithm = (IIPAuthPacketHashAlgorithm)data[offset++]; var hashLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, hashLength)) return -dataLengthNeeded; Challenge = data.Clip(offset, hashLength); offset += hashLength; if (NotEnough(offset, ends, 2)) return -dataLengthNeeded; var certLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, certLength)) return -dataLengthNeeded; Certificate = data.Clip(offset, certLength); offset += certLength; } else if (Action == IIPAuthPacketAction.IAuthPlain) { if (NotEnough(offset, ends, 5)) return -dataLengthNeeded; Reference = data.GetUInt32(offset, Endian.Little); offset += 4; (var size, DataType) = TransmissionType.Parse(data, offset, ends); if (DataType == null) return -(int)size; offset += (uint)size; } else if (Action == IIPAuthPacketAction.IAuthHashed) { if (NotEnough(offset, ends, 7)) return -dataLengthNeeded; Reference = data.GetUInt32(offset, Endian.Little); offset += 4; HashAlgorithm = (IIPAuthPacketHashAlgorithm)data[offset++]; var cl = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, cl)) return -dataLengthNeeded; Challenge = data.Clip(offset, cl); offset += cl; } else if (Action == IIPAuthPacketAction.IAuthEncrypted) { if (NotEnough(offset, ends, 7)) return -dataLengthNeeded; Reference = data.GetUInt32(offset, Endian.Little); offset += 4; PublicKeyAlgorithm = (IIPAuthPacketPublicKeyAlgorithm)data[offset++]; var cl = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, cl)) return -dataLengthNeeded; Challenge = data.Clip(offset, cl); offset += cl; } else if (Action == IIPAuthPacketAction.EstablishNewSession) { // Nothing here } else if (Action == IIPAuthPacketAction.EstablishResumeSession) { if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; var sessionLength = data[offset++]; if (NotEnough(offset, ends, sessionLength)) return -dataLengthNeeded; SessionId = data.Clip(offset, sessionLength); offset += sessionLength; } else if (Action == IIPAuthPacketAction.EncryptKeyExchange) { if (NotEnough(offset, ends, 2)) return -dataLengthNeeded; var keyLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, keyLength)) return -dataLengthNeeded; AsymetricEncryptionKey = data.Clip(offset, keyLength); offset += keyLength; } else if (Action == IIPAuthPacketAction.RegisterEndToEndKey || Action == IIPAuthPacketAction.RegisterHomomorphic) { if (NotEnough(offset, ends, 3)) return -dataLengthNeeded; PublicKeyAlgorithm = (IIPAuthPacketPublicKeyAlgorithm)data[offset++]; var keyLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, keyLength)) return -dataLengthNeeded; AsymetricEncryptionKey = data.Clip(offset, keyLength); offset += keyLength; } } else if (Command == IIPAuthPacketCommand.Event) { Event = (IIPAuthPacketEvent)data[offset++]; if (Event == IIPAuthPacketEvent.ErrorTerminate || Event == IIPAuthPacketEvent.ErrorMustEncrypt || Event == IIPAuthPacketEvent.ErrorRetry) { if (NotEnough(offset, ends, 3)) return -dataLengthNeeded; ErrorCode = data[offset++]; var msgLength = data.GetUInt16(offset, Endian.Little); offset += 2; if (NotEnough(offset, ends, msgLength)) return -dataLengthNeeded; Message = data.GetString(offset, msgLength); offset += msgLength; } else if (Event == IIPAuthPacketEvent.IndicationEstablished) { if (NotEnough(offset, ends, 2)) return -dataLengthNeeded; var sessionLength = data[offset++]; if (NotEnough(offset, ends, sessionLength)) return -dataLengthNeeded; SessionId = data.Clip(offset, sessionLength); offset += sessionLength; if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; var accountLength = data[offset++]; if (NotEnough(offset, ends, accountLength)) return -dataLengthNeeded; AccountId = data.Clip(offset, accountLength); offset += accountLength; } else if (Event == IIPAuthPacketEvent.IAuthPlain || Event == IIPAuthPacketEvent.IAuthHashed || Event == IIPAuthPacketEvent.IAuthEncrypted) { if (NotEnough(offset, ends, 1)) return -dataLengthNeeded; (var size, DataType) = TransmissionType.Parse(data, offset, ends); if (DataType == null) return -(int)size; offset += (uint)size; } } return offset - oOffset; } }