Code:
/ WCF / WCF / 3.5.30729.1 / untmp / Orcas / SP / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Tokens / KerberosRequestorSecurityToken.cs / 2 / KerberosRequestorSecurityToken.cs
//------------------------------------------------------------ // Copyright (c) Microsoft Corporation. All rights reserved. //----------------------------------------------------------- namespace System.IdentityModel.Tokens { using System.ComponentModel; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Net; using System.Runtime.InteropServices; using System.Security.Cryptography; using System.Security.Principal; public class KerberosRequestorSecurityToken : SecurityToken { string id; byte[] apreq; readonly string servicePrincipalName; SymmetricSecurityKey symmetricSecurityKey; ReadOnlyCollectionsecurityKeys; DateTime effectiveTime; DateTime expirationTime; public KerberosRequestorSecurityToken(string servicePrincipalName) : this(servicePrincipalName, TokenImpersonationLevel.Impersonation, null, SecurityUniqueId.Create().Value) { } public KerberosRequestorSecurityToken(string servicePrincipalName, TokenImpersonationLevel tokenImpersonationLevel, NetworkCredential networkCredential, string id) : this(servicePrincipalName, tokenImpersonationLevel, networkCredential, id, null) { } internal KerberosRequestorSecurityToken(string servicePrincipalName, TokenImpersonationLevel tokenImpersonationLevel, NetworkCredential networkCredential, string id, SafeFreeCredentials credentialsHandle) { if (servicePrincipalName == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("servicePrincipalName"); if (tokenImpersonationLevel != TokenImpersonationLevel.Identification && tokenImpersonationLevel != TokenImpersonationLevel.Impersonation) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("tokenImpersonationLevel", SR.GetString(SR.ImpersonationLevelNotSupported, tokenImpersonationLevel))); } if (id == null) throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("id"); this.servicePrincipalName = servicePrincipalName; if (networkCredential != null && networkCredential != CredentialCache.DefaultNetworkCredentials) { if (String.IsNullOrEmpty(networkCredential.UserName)) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.GetString(SR.ProvidedNetworkCredentialsForKerberosHasInvalidUserName)); } // Note: we don't check the domain, since Lsa accepts // FQ userName. } this.id = id; try { Initialize(tokenImpersonationLevel, networkCredential, credentialsHandle); } catch (Win32Exception e) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenValidationException(SR.GetString(SR.UnableToCreateKerberosCredentials), e)); } catch (SecurityTokenException ste) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenValidationException(SR.GetString(SR.UnableToCreateKerberosCredentials), ste)); } } public override string Id { get { return this.id; } } public override ReadOnlyCollection SecurityKeys { get { if (this.securityKeys == null) { List temp = new List (1); temp.Add(this.symmetricSecurityKey); this.securityKeys = temp.AsReadOnly(); } return this.securityKeys; } } public override DateTime ValidFrom { get { return this.effectiveTime; } } public override DateTime ValidTo { get { return this.expirationTime; } } public string ServicePrincipalName { get { return this.servicePrincipalName; } } public SymmetricSecurityKey SecurityKey { get { return this.symmetricSecurityKey; } } public byte[] GetRequest() { return SecurityUtils.CloneBuffer(this.apreq); } void Initialize(TokenImpersonationLevel tokenImpersonationLevel, NetworkCredential networkCredential, SafeFreeCredentials credentialsHandle) { bool ownCredentialsHandle = false; SafeDeleteContext securityContext = null; try { if (credentialsHandle == null) { if (networkCredential == null || networkCredential == CredentialCache.DefaultNetworkCredentials) { credentialsHandle = SspiWrapper.AcquireDefaultCredential( "Kerberos", CredentialUse.Outbound); } else { AuthIdentityEx authIdentity = new AuthIdentityEx(networkCredential.UserName, networkCredential.Password, networkCredential.Domain); credentialsHandle = SspiWrapper.AcquireCredentialsHandle( "Kerberos", CredentialUse.Outbound, ref authIdentity); } ownCredentialsHandle = true; } SspiContextFlags fContextReq = SspiContextFlags.AllocateMemory | SspiContextFlags.Confidentiality | SspiContextFlags.ReplayDetect | SspiContextFlags.SequenceDetect; // we only accept Identity or Impersonation (Impersonation is default). if (tokenImpersonationLevel == TokenImpersonationLevel.Identification) { fContextReq |= SspiContextFlags.InitIdentify; } SspiContextFlags contextFlags = SspiContextFlags.Zero; SecurityBuffer inSecurityBuffer = null; SecurityBuffer outSecurityBuffer = new SecurityBuffer(0, BufferType.Token); int statusCode = SspiWrapper.InitializeSecurityContext(credentialsHandle, ref securityContext, this.servicePrincipalName, fContextReq, Endianness.Native, inSecurityBuffer, outSecurityBuffer, ref contextFlags); if (statusCode != (int)SecurityStatus.OK) { if (statusCode == (int)SecurityStatus.ContinueNeeded) { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SecurityTokenException(SR.GetString(SR.KerberosMultilegsNotSupported), new Win32Exception(statusCode))); } else { throw DiagnosticUtility.ExceptionUtility.ThrowHelperError( new SecurityTokenException(SR.GetString(SR.FailInitializeSecurityContext), new Win32Exception(statusCode))); } } #if REMOVEGSS // // ... and strip GSS-framing from it // int offset = 0; int len = outSecurityBuffer.token.Length; DEREncoding.VerifyTokenHeader(outSecurityBuffer.token, ref offset, ref len); this.apreq = SecurityUtils.CloneBuffer(outSecurityBuffer.token, offset, len); #else this.apreq = outSecurityBuffer.token; #endif // Expiration LifeSpan lifeSpan = (LifeSpan)SspiWrapper.QueryContextAttributes(securityContext, ContextAttribute.Lifespan); this.effectiveTime = lifeSpan.EffectiveTimeUtc; this.expirationTime = lifeSpan.ExpiryTimeUtc; // SessionKey SecuritySessionKeyClass sessionKey = (SecuritySessionKeyClass)SspiWrapper.QueryContextAttributes(securityContext, ContextAttribute.SessionKey); this.symmetricSecurityKey = new InMemorySymmetricSecurityKey(sessionKey.SessionKey); } finally { if (securityContext != null) securityContext.Close(); if (ownCredentialsHandle && credentialsHandle != null) credentialsHandle.Close(); } } public override bool CanCreateKeyIdentifierClause () { if (typeof(T) == typeof(KerberosTicketHashKeyIdentifierClause)) return true; return base.CanCreateKeyIdentifierClause (); } public override T CreateKeyIdentifierClause () { if (typeof(T) == typeof(KerberosTicketHashKeyIdentifierClause)) return new KerberosTicketHashKeyIdentifierClause(CryptoHelper.ComputeHash(this.apreq), false, null, 0) as T; return base.CreateKeyIdentifierClause (); } public override bool MatchesKeyIdentifierClause(SecurityKeyIdentifierClause keyIdentifierClause) { KerberosTicketHashKeyIdentifierClause kerbKeyIdentifierClause = keyIdentifierClause as KerberosTicketHashKeyIdentifierClause; if (kerbKeyIdentifierClause != null) return kerbKeyIdentifierClause.Matches(CryptoHelper.ComputeHash(this.apreq)); return base.MatchesKeyIdentifierClause(keyIdentifierClause); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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