KerberosRequestorSecurityToken.cs source code in C# .NET

                        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;
        ReadOnlyCollection securityKeys;
        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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KerberosRequestorSecurityToken.cs source code in C# .NET

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