mcs/class/System/ReferenceSources/SSPISafeHandles.cs

   1 //
   2 // SafeHandles.cs
   3 //
   4 // Author:
   5 //       Martin Baulig <martin.baulig@xamarin.com>
   6 //
   7 // Copyright (c) 2015 Xamarin Inc. (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26 #if MONO_FEATURE_NEW_TLS && SECURITY_DEP
  27 #if MONO_SECURITY_ALIAS
  28 extern alias MonoSecurity;
  29 using IMonoTlsContext = MonoSecurity::Mono.Security.Interface.IMonoTlsContext;
  30 #else
  31 using IMonoTlsContext = Mono.Security.Interface.IMonoTlsContext;
  32 #endif
  33
  34 using System.Runtime.InteropServices;
  35 using System.Security.Cryptography.X509Certificates;
  36
  37 namespace System.Net.Security
  38 {
  39         class DummySafeHandle : SafeHandle
  40         {
  41                 protected DummySafeHandle ()
  42                         : base ((IntPtr)(-1), true)
  43                 {
  44                 }
  45
  46                 protected override bool ReleaseHandle ()
  47                 {
  48                         return true;
  49                 }
  50
  51                 public override bool IsInvalid {
  52                         get { return handle == (IntPtr)(-1); }
  53                 }
  54         }
  55
  56         class SafeFreeCertContext : DummySafeHandle
  57         {
  58         }
  59
  60         class SafeFreeCredentials : DummySafeHandle
  61         {
  62                 SecureCredential credential;
  63
  64                 public X509Certificate2 Certificate {
  65                         get {
  66                                 if (IsInvalid)
  67                                         throw new ObjectDisposedException ("Certificate");
  68                                 return credential.certificate;
  69                         }
  70                 }
  71
  72                 public SafeFreeCredentials (SecureCredential credential)
  73                 {
  74                         this.credential = credential;
  75                         bool success = true;
  76                         DangerousAddRef (ref success);
  77                 }
  78
  79                 public override bool IsInvalid {
  80                         get {
  81                                 return credential.certificate == null;
  82                         }
  83                 }
  84
  85                 protected override bool ReleaseHandle ()
  86                 {
  87                         credential.Clear ();
  88                         return base.ReleaseHandle ();
  89                 }
  90         }
  91
  92         class SafeDeleteContext : DummySafeHandle
  93         {
  94                 IMonoTlsContext context;
  95
  96                 public IMonoTlsContext Context {
  97                         get {
  98                                 if (IsInvalid)
  99                                         throw new ObjectDisposedException ("TlsContext");
 100                                 return context;
 101                         }
 102                 }
 103
 104                 public SafeDeleteContext (IMonoTlsContext context)
 105                 {
 106                         this.context = context;
 107                 }
 108
 109                 public override bool IsInvalid {
 110                         get {
 111                                 return context == null || !context.IsValid;
 112                         }
 113                 }
 114
 115                 protected override bool ReleaseHandle ()
 116                 {
 117                         context.Dispose ();
 118                         context = null;
 119                         return base.ReleaseHandle ();
 120                 }
 121         }
 122
 123         struct SecureCredential
 124         {
 125                 public const int CurrentVersion = 0x4;
 126
 127                 [Flags]
 128                 public enum Flags
 129                 {
 130                         Zero = 0,
 131                         NoSystemMapper = 0x02,
 132                         NoNameCheck = 0x04,
 133                         ValidateManual = 0x08,
 134                         NoDefaultCred = 0x10,
 135                         ValidateAuto = 0x20,
 136                         SendAuxRecord = 0x00200000,
 137                         UseStrongCrypto = 0x00400000
 138                 }
 139
 140                 int version;
 141                 internal X509Certificate2 certificate;
 142                 SchProtocols protocols;
 143                 EncryptionPolicy policy;
 144
 145                 public SecureCredential (int version, X509Certificate2 certificate, SecureCredential.Flags flags, SchProtocols protocols, EncryptionPolicy policy)
 146                 {
 147                         this.version = version;
 148                         this.certificate = certificate;
 149                         this.protocols = protocols;
 150                         this.policy = policy;
 151                 }
 152
 153                 public void Clear ()
 154                 {
 155                         certificate = null;
 156                 }
 157         }
 158
 159         internal class SafeCredentialReference : DummySafeHandle
 160         {
 161                 //
 162                 // Static cache will return the target handle if found the reference in the table.
 163                 //
 164                 internal SafeFreeCredentials _Target;
 165
 166                 //
 167                 //
 168                 internal static SafeCredentialReference CreateReference (SafeFreeCredentials target)
 169                 {
 170                         SafeCredentialReference result = new SafeCredentialReference (target);
 171                         if (result.IsInvalid)
 172                                 return null;
 173
 174                         return result;
 175                 }
 176
 177                 private SafeCredentialReference (SafeFreeCredentials target)
 178                         : base ()
 179                 {
 180                         // Bumps up the refcount on Target to signify that target handle is statically cached so
 181                         // its dispose should be postponed
 182                         bool b = false;
 183                         try {
 184                                 target.DangerousAddRef (ref b);
 185                         } catch {
 186                                 if (b) {
 187                                         target.DangerousRelease ();
 188                                         b = false;
 189                                 }
 190                         } finally {
 191                                 if (b) {
 192                                         _Target = target;
 193                                         SetHandle (new IntPtr (0));   // make this handle valid
 194                                 }
 195                         }
 196                 }
 197
 198                 override protected bool ReleaseHandle ()
 199                 {
 200                         SafeFreeCredentials target = _Target;
 201                         if (target != null)
 202                                 target.DangerousRelease ();
 203                         _Target = null;
 204                         return true;
 205                 }
 206         }
 207
 208 }
 209 #endif