Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Tokens / RsaSecurityToken.cs / 1305376 / RsaSecurityToken.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.IdentityModel.Tokens { using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Diagnostics; using System.Runtime.InteropServices; using System.Security.Cryptography; using System.Runtime.CompilerServices; public class RsaSecurityToken : SecurityToken { string id; DateTime effectiveTime; ReadOnlyCollectionrsaKey; RSA rsa; CspKeyContainerInfo keyContainerInfo; GCHandle rsaHandle; public RsaSecurityToken(RSA rsa) : this(rsa, SecurityUniqueId.Create().Value) { } public RsaSecurityToken(RSA rsa, string id) { if (rsa == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("rsa"); if (id == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("id"); this.rsa = rsa; this.id = id; this.effectiveTime = DateTime.UtcNow; GC.SuppressFinalize(this); } // This is defense-in-depth. // Rsa finalizer can throw and bring down the process if in finalizer context. // This internal ctor is used by SM's IssuedSecurityTokenProvider. // If ownsRsa=true, this class will take ownership of the Rsa object and provides // a reliable finalizing/disposing of Rsa object. The GCHandle is used to ensure // order in finalizer sequence. RsaSecurityToken(RSACryptoServiceProvider rsa, bool ownsRsa) { if (rsa == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("rsa"); this.rsa = rsa; this.id = SecurityUniqueId.Create().Value; this.effectiveTime = DateTime.UtcNow; if (ownsRsa) { // This also key pair generation. // This must be called before PersistKeyInCsp to avoid a handle to go out of scope. this.keyContainerInfo = rsa.CspKeyContainerInfo; // We will handle key file deletion rsa.PersistKeyInCsp = true; this.rsaHandle = GCHandle.Alloc(rsa); } else { GC.SuppressFinalize(this); } } ~RsaSecurityToken() { Dispose(false); } internal void Dispose() { Dispose(true); GC.SuppressFinalize(this); } void Dispose(bool disposing) { if (this.rsaHandle.IsAllocated) { try { // keyContainerInfo is a wrapper over a member of Rsa. // this is to be safe that rsa.Dispose won't clean up that member. string keyContainerName = this.keyContainerInfo.KeyContainerName; string providerName = this.keyContainerInfo.ProviderName; uint providerType = (uint)this.keyContainerInfo.ProviderType; ((IDisposable)this.rsa).Dispose(); // Best effort delete key file in user context SafeProvHandle provHandle; if (!NativeMethods.CryptAcquireContextW(out provHandle, keyContainerName, providerName, providerType, NativeMethods.CRYPT_DELETEKEYSET)) { int error = Marshal.GetLastWin32Error(); try { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new InvalidOperationException(SR.GetString(SR.FailedToDeleteKeyContainerFile), new Win32Exception(error))); } catch (InvalidOperationException ex) { if (DiagnosticUtility.ShouldTraceWarning) { DiagnosticUtility.ExceptionUtility.TraceHandledException(ex, TraceEventType.Warning); } } } System.ServiceModel.Diagnostics.Utility.CloseInvalidOutSafeHandle(provHandle); } finally { this.rsaHandle.Free(); } } } internal static RsaSecurityToken CreateSafeRsaSecurityToken(int keySize) { RsaSecurityToken token; RSACryptoServiceProvider rsa = null; RuntimeHelpers.PrepareConstrainedRegions(); try { try { } finally { rsa = new RSACryptoServiceProvider(keySize); } token = new RsaSecurityToken(rsa, true); rsa = null; } finally { if (rsa != null) { ((IDisposable)rsa).Dispose(); } } return token; } public override string Id { get { return this.id; } } public override DateTime ValidFrom { get { return this.effectiveTime; } } public override DateTime ValidTo { // Never expire get { return SecurityUtils.MaxUtcDateTime; } } public override ReadOnlyCollection SecurityKeys { get { if (this.rsaKey == null) { List keys = new List (1); keys.Add(new RsaSecurityKey(this.rsa)); this.rsaKey = keys.AsReadOnly(); } return this.rsaKey; } } public RSA Rsa { get { return this.rsa; } } public override bool CanCreateKeyIdentifierClause () { return typeof(T) == typeof(RsaKeyIdentifierClause); } public override T CreateKeyIdentifierClause () { if (typeof(T) == typeof(RsaKeyIdentifierClause)) return (T)((object)new RsaKeyIdentifierClause(this.rsa)); throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException( SR.GetString(SR.TokenDoesNotSupportKeyIdentifierClauseCreation, GetType().Name, typeof(T).Name))); } public override bool MatchesKeyIdentifierClause(SecurityKeyIdentifierClause keyIdentifierClause) { RsaKeyIdentifierClause rsaKeyIdentifierClause = keyIdentifierClause as RsaKeyIdentifierClause; if (rsaKeyIdentifierClause != null) return rsaKeyIdentifierClause.Matches(this.rsa); return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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