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// Copyright 2006 Alp Toker <alp@atoker.com>
// This software is made available under the MIT License
// See COPYING for details
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Globalization;
namespace NDesk.DBus.Authentication
{
enum ClientState
{
WaitingForData,
WaitingForOK,
WaitingForReject,
}
enum ServerState
{
WaitingForAuth,
WaitingForData,
WaitingForBegin,
}
class SaslClient
{
protected Connection conn;
protected SaslClient ()
{
}
public SaslClient (Connection conn)
{
this.conn = conn;
}
public void Run ()
{
StreamReader sr = new StreamReader (conn.Transport.Stream, Encoding.ASCII);
StreamWriter sw = new StreamWriter (conn.Transport.Stream, Encoding.ASCII);
sw.NewLine = "\r\n";
string str = conn.Transport.AuthString ();
byte[] bs = Encoding.ASCII.GetBytes (str);
string authStr = ToHex (bs);
sw.WriteLine ("AUTH EXTERNAL {0}", authStr);
sw.Flush ();
string ok_rep = sr.ReadLine ();
string[] parts;
parts = ok_rep.Split (' ');
if (parts.Length < 1 || parts[0] != "OK")
throw new Exception ("Authentication error: AUTH EXTERNAL was not OK: \"" + ok_rep + "\"");
/*
string guid = parts[1];
byte[] guidData = FromHex (guid);
uint unixTime = BitConverter.ToUInt32 (guidData, 0);
Console.Error.WriteLine ("guid: " + guid + ", " + "unixTime: " + unixTime + " (" + UnixToDateTime (unixTime) + ")");
*/
sw.WriteLine ("BEGIN");
sw.Flush ();
}
//From Mono.Unix.Native.NativeConvert
//should these methods use long or (u)int?
public static DateTime UnixToDateTime (long time)
{
DateTime LocalUnixEpoch = new DateTime (1970, 1, 1);
TimeSpan LocalUtcOffset = TimeZone.CurrentTimeZone.GetUtcOffset (DateTime.UtcNow);
return LocalUnixEpoch.AddSeconds ((double) time + LocalUtcOffset.TotalSeconds);
}
public static long DateTimeToUnix (DateTime time)
{
DateTime LocalUnixEpoch = new DateTime (1970, 1, 1);
TimeSpan LocalUtcOffset = TimeZone.CurrentTimeZone.GetUtcOffset (DateTime.UtcNow);
TimeSpan unixTime = time.Subtract (LocalUnixEpoch) - LocalUtcOffset;
return (long) unixTime.TotalSeconds;
}
//From Mono.Security.Cryptography
//Modified to output lowercase hex
static public string ToHex (byte[] input)
{
if (input == null)
return null;
StringBuilder sb = new StringBuilder (input.Length * 2);
foreach (byte b in input) {
sb.Append (b.ToString ("x2", CultureInfo.InvariantCulture));
}
return sb.ToString ();
}
//From Mono.Security.Cryptography
static private byte FromHexChar (char c)
{
if ((c >= 'a') && (c <= 'f'))
return (byte) (c - 'a' + 10);
if ((c >= 'A') && (c <= 'F'))
return (byte) (c - 'A' + 10);
if ((c >= '0') && (c <= '9'))
return (byte) (c - '0');
throw new ArgumentException ("Invalid hex char");
}
//From Mono.Security.Cryptography
static public byte[] FromHex (string hex)
{
if (hex == null)
return null;
if ((hex.Length & 0x1) == 0x1)
throw new ArgumentException ("Length must be a multiple of 2");
byte[] result = new byte [hex.Length >> 1];
int n = 0;
int i = 0;
while (n < result.Length) {
result [n] = (byte) (FromHexChar (hex [i++]) << 4);
result [n++] += FromHexChar (hex [i++]);
}
return result;
}
}
}
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