WrappedKeySecurityToken.cs :  » 2.6.4-mono-.net-core » System.ServiceModel » System » ServiceModel » Security » Tokens » C# / CSharp Open Source

//
// WrappedKeySecurityToken.cs
//
// Author:
//  Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2006 Novell, Inc.  http://www.novell.com
//
// 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 System;
using System.Collections.ObjectModel;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Xml;
using System.IdentityModel.Policy;
using System.IdentityModel.Tokens;

namespace System.ServiceModel.Security.Tokens{
  public class WrappedKeySecurityToken : SecurityToken
  {
    string id;
    byte [] raw_key;
    byte [] wrapped_key;
    string wrap_alg;
    SecurityToken wrap_token;
    SecurityKeyIdentifier wrap_token_ref;
    DateTime valid_from = DateTime.Now.ToUniversalTime ();
    ReadOnlyCollection<SecurityKey> keys;
    ReferenceList reference_list;
    byte [] keyhash;

    public WrappedKeySecurityToken (
      string id,
      byte [] keyToWrap,
      string wrappingAlgorithm,
      SecurityToken wrappingToken,
      SecurityKeyIdentifier wrappingTokenReference)
    {
      if (id == null)
        throw new ArgumentNullException ("id");
      if (keyToWrap == null)
        throw new ArgumentNullException ("keyToWrap");
      if (wrappingAlgorithm == null)
        throw new ArgumentNullException ("wrappingAlgorithm");
      if (wrappingToken == null)
        throw new ArgumentNullException ("wrappingToken");

      raw_key = keyToWrap;
      this.id = id;
      wrap_alg = wrappingAlgorithm;
      wrap_token = wrappingToken;
      wrap_token_ref = wrappingTokenReference;
      Collection<SecurityKey> l = new Collection<SecurityKey> ();
      foreach (SecurityKey sk in wrappingToken.SecurityKeys) {
        if (sk.IsSupportedAlgorithm (wrappingAlgorithm)) {
          wrapped_key = sk.EncryptKey (wrappingAlgorithm, keyToWrap);
          l.Add (new InMemorySymmetricSecurityKey (keyToWrap));
          break;
        }
      }
      keys = new ReadOnlyCollection<SecurityKey> (l);
      if (wrapped_key == null)
        throw new ArgumentException (String.Format ("None of the security keys in the argument token supports specified wrapping algorithm '{0}'", wrappingAlgorithm));
    }

    internal byte [] RawKey {
      get { return raw_key; }
    }

    // It is kind of compromised solution to output
    // ReferenceList inside e:EncryptedKey and might disappear
    // when non-wrapped key is represented by another token type.
    internal ReferenceList ReferenceList {
      get { return reference_list; }
      set { reference_list = value; }
    }

    public override DateTime ValidFrom {
      get { return valid_from; }
    }

    public override DateTime ValidTo {
      get { return DateTime.MaxValue.AddDays (-1); }
    }

    public override string Id {
      get { return id; }
    }

    public override ReadOnlyCollection<SecurityKey> SecurityKeys {
      get { return keys; }
    }

    public string WrappingAlgorithm {
      get { return wrap_alg; }
    }

    public SecurityToken WrappingToken {
      get { return wrap_token; }
    }

    public SecurityKeyIdentifier WrappingTokenReference {
      get { return wrap_token_ref; }
    }

    public byte [] GetWrappedKey ()
    {
      return (byte []) wrapped_key.Clone ();
    }

    internal void SetWrappedKey (byte [] value)
    {
      wrapped_key = (byte []) value.Clone ();
    }

    [MonoTODO]
    public override bool CanCreateKeyIdentifierClause<T> ()
    {
      /*
      foreach (SecurityKeyIdentifierClause k in WrappingTokenReference) {
        Type t = k.GetType ();
        if (t == typeof (T) || t.IsSubclassOf (typeof (T)))
          return true;
      }
      */
      return false;
    }

    [MonoTODO]
    public override T CreateKeyIdentifierClause<T> ()
    {
      /*
      foreach (SecurityKeyIdentifierClause k in WrappingTokenReference) {
        Type t = k.GetType ();
        if (t == typeof (T) || t.IsSubclassOf (typeof (T)))
          return (T) k;
      }
      */
      throw new NotSupportedException (String.Format ("WrappedKeySecurityToken cannot create '{0}'", typeof (T)));
    }

    public override bool MatchesKeyIdentifierClause (SecurityKeyIdentifierClause keyIdentifierClause)
    {
      LocalIdKeyIdentifierClause lkic = keyIdentifierClause as LocalIdKeyIdentifierClause;
      if (lkic != null && lkic.LocalId == Id)
        return true;

      InternalEncryptedKeyIdentifierClause khic = keyIdentifierClause as InternalEncryptedKeyIdentifierClause;
      if (keyhash == null)
        keyhash = SHA1.Create ().ComputeHash (wrapped_key);
      if (khic != null && khic.Matches (keyhash))
        return true;

      return false;
    }
  }
}