From 5c7ffdde0b9642a42e8f5987e06eb01220ff7776 Mon Sep 17 00:00:00 2001 From: Adam Frisby Date: Wed, 11 Jul 2007 08:02:47 +0000 Subject: * Wiping trunk in prep for Sugilite --- Common/OpenSim.Framework/Remoting.cs | 137 ----------------------------------- 1 file changed, 137 deletions(-) delete mode 100644 Common/OpenSim.Framework/Remoting.cs (limited to 'Common/OpenSim.Framework/Remoting.cs') diff --git a/Common/OpenSim.Framework/Remoting.cs b/Common/OpenSim.Framework/Remoting.cs deleted file mode 100644 index 660cdde..0000000 --- a/Common/OpenSim.Framework/Remoting.cs +++ /dev/null @@ -1,137 +0,0 @@ -/* -* Copyright (c) Contributors, http://www.openmetaverse.org/ -* See CONTRIBUTORS.TXT for a full list of copyright holders. -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions are met: -* * Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* * Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in the -* documentation and/or other materials provided with the distribution. -* * Neither the name of the OpenSim Project nor the -* names of its contributors may be used to endorse or promote products -* derived from this software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS AND ANY -* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED -* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY -* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND -* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -* -*/ - -using System; -using System.Collections.Generic; -using System.Text; -using System.Security.Cryptography; - -namespace OpenSim.Framework -{ - /// - /// NEEDS AUDIT. - /// - /// - /// Suggested implementation - /// Store two digests for each foreign host. A local copy of the local hash using the local challenge (when issued), and a local copy of the remote hash using the remote challenge. - /// When sending data to the foreign host - run 'Sign' on the data and affix the returned byte[] to the message. - /// When recieving data from the foreign host - run 'Authenticate' against the data and the attached byte[]. - /// Both hosts should be performing these operations for this to be effective. - /// - class RemoteDigest - { - private byte[] currentHash; - private byte[] secret; - - private SHA512Managed SHA512; - - /// - /// Initialises a new RemoteDigest authentication mechanism - /// - /// Needs an audit by a cryptographic professional - was not "roll your own"'d by choice but rather a serious lack of decent authentication mechanisms in .NET remoting - /// The shared secret between systems (for inter-sim, this is provided in encrypted form during connection, for grid this is input manually in setup) - /// Binary salt - some common value - to be decided what - /// The challenge key provided by the third party - public RemoteDigest(string sharedSecret, byte[] salt, string challenge) - { - SHA512 = new SHA512Managed(); - Rfc2898DeriveBytes RFC2898 = new Rfc2898DeriveBytes(sharedSecret,salt); - secret = RFC2898.GetBytes(512); - ASCIIEncoding ASCII = new ASCIIEncoding(); - - currentHash = SHA512.ComputeHash(AppendArrays(secret, ASCII.GetBytes(challenge))); - } - - /// - /// Authenticates a piece of incoming data against the local digest. Upon successful authentication, digest string is incremented. - /// - /// The incoming data - /// The remote digest - /// - public bool Authenticate(byte[] data, byte[] digest) - { - byte[] newHash = SHA512.ComputeHash(AppendArrays(AppendArrays(currentHash, secret), data)); - if (digest == newHash) - { - currentHash = newHash; - return true; - } - else - { - throw new Exception("Hash comparison failed. Key resync required."); - } - } - - /// - /// Signs a new bit of data with the current hash. Returns a byte array which should be affixed to the message. - /// Signing a piece of data will automatically increment the hash - if you sign data and do not send it, the - /// hashes will get out of sync and throw an exception when validation is attempted. - /// - /// The outgoing data - /// The local digest - public byte[] Sign(byte[] data) - { - currentHash = SHA512.ComputeHash(AppendArrays(AppendArrays(currentHash, secret), data)); - return currentHash; - } - - /// - /// Generates a new challenge string to be issued to a foreign host. Challenges are 1024-bit (effective strength of less than 512-bits) messages generated using the Crytographic Random Number Generator. - /// - /// A 128-character hexadecimal string containing the challenge. - public static string GenerateChallenge() - { - RNGCryptoServiceProvider RNG = new RNGCryptoServiceProvider(); - byte[] bytes = new byte[64]; - RNG.GetBytes(bytes); - - StringBuilder sb = new StringBuilder(bytes.Length * 2); - foreach (byte b in bytes) - { - sb.AppendFormat("{0:x2}", b); - } - return sb.ToString(); - } - - /// - /// Helper function, merges two byte arrays - /// - /// Sourced from MSDN Forum - /// A - /// B - /// C - private byte[] AppendArrays(byte[] a, byte[] b) - { - byte[] c = new byte[a.Length + b.Length]; - Buffer.BlockCopy(a, 0, c, 0, a.Length); - Buffer.BlockCopy(b, 0, c, a.Length, b.Length); - return c; - } - - } -} -- cgit v1.1