X509CertificateValidator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / IdentityModel / System / IdentityModel / Selectors / X509CertificateValidator.cs / 1305376 / X509CertificateValidator.cs
                        
                        
                            //------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------

namespace System.IdentityModel.Selectors 
{
    using System.Collections.ObjectModel; 
    using System.Diagnostics; 
    using System.IdentityModel.Tokens;
    using System.Security.Cryptography; 
    using System.Security.Cryptography.X509Certificates;
    using System.Text;

    // This is to allow easy rollback to CLR implementation by commenting out the below. 
    using X509Chain = System.IdentityModel.Selectors.X509CertificateChain;
 
    public abstract class X509CertificateValidator 
    {
        static X509CertificateValidator peerTrust; 
        static X509CertificateValidator chainTrust;
        static X509CertificateValidator ntAuthChainTrust;
        static X509CertificateValidator peerOrChainTrust;
        static X509CertificateValidator none; 

        public static X509CertificateValidator None 
        { 
            get
            { 
                if (none == null)
                    none = new NoneX509CertificateValidator();
                return none;
            } 
        }
 
        public static X509CertificateValidator PeerTrust 
        {
            get 
            {
                if (peerTrust == null)
                    peerTrust = new PeerTrustValidator();
                return peerTrust; 
            }
        } 
 
        public static X509CertificateValidator ChainTrust
        { 
            get
            {
                if (chainTrust == null)
                    chainTrust = new ChainTrustValidator(); 
                return chainTrust;
            } 
        } 

        internal static X509CertificateValidator NTAuthChainTrust 
        {
            get
            {
                if (ntAuthChainTrust == null) 
                    ntAuthChainTrust = new ChainTrustValidator(false, null, CAPI.CERT_CHAIN_POLICY_NT_AUTH);
                return ntAuthChainTrust; 
            } 
        }
 
        public static X509CertificateValidator PeerOrChainTrust
        {
            get
            { 
                if (peerOrChainTrust == null)
                    peerOrChainTrust = new PeerOrChainTrustValidator(); 
                return peerOrChainTrust; 
            }
        } 

        public static X509CertificateValidator CreateChainTrustValidator(bool useMachineContext, X509ChainPolicy chainPolicy)
        {
            if (chainPolicy == null) 
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("chainPolicy");
            return new ChainTrustValidator(useMachineContext, chainPolicy, X509CertificateChain.DefaultChainPolicyOID); 
        } 

        public static X509CertificateValidator CreatePeerOrChainTrustValidator(bool useMachineContext, X509ChainPolicy chainPolicy) 
        {
            if (chainPolicy == null)
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("chainPolicy");
            return new PeerOrChainTrustValidator(useMachineContext, chainPolicy); 
        }
 
        public abstract void Validate(X509Certificate2 certificate); 

        class NoneX509CertificateValidator : X509CertificateValidator 
        {
            public override void Validate(X509Certificate2 certificate)
            {
                if (certificate == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate");
            } 
        } 

        class PeerTrustValidator : X509CertificateValidator 
        {
            public override void Validate(X509Certificate2 certificate)
            {
                if (certificate == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate");
 
                Exception exception; 
                if (!TryValidate(certificate, out exception))
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(exception); 
            }

            static bool StoreContainsCertificate(StoreName storeName, X509Certificate2 certificate)
            { 
                X509CertificateStore store = new X509CertificateStore(storeName, StoreLocation.CurrentUser);
                X509Certificate2Collection certificates = null; 
                try 
                {
                    store.Open(OpenFlags.ReadOnly); 
                    certificates = store.Find(X509FindType.FindByThumbprint, certificate.GetCertHash(), false);
                    return certificates.Count > 0;
                }
                finally 
                {
                    SecurityUtils.ResetAllCertificates(certificates); 
                    store.Close(); 
                }
            } 

            internal bool TryValidate(X509Certificate2 certificate, out Exception exception)
            {
                // Checklist 
                // 1) time validity of cert
                // 2) in trusted people store 
                // 3) not in disallowed store 

                // The following code could be written as: 
                // DateTime now = DateTime.UtcNow;
                // if (now > certificate.NotAfter.ToUniversalTime() || now < certificate.NotBefore.ToUniversalTime())
                //
                // this is because X509Certificate2.xxx doesn't return UT.  However this would be a SMALL perf hit. 
                // I put a DebugAssert so that this will ensure that the we are compatible with the CLR we shipped with
 
                DateTime now = DateTime.Now; 
                DiagnosticUtility.DebugAssert(now.Kind == certificate.NotAfter.Kind && now.Kind == certificate.NotBefore.Kind, "");
 
                if (now > certificate.NotAfter || now < certificate.NotBefore )
                {
                    exception = new SecurityTokenValidationException(SR.GetString(SR.X509InvalidUsageTime,
                        SecurityUtils.GetCertificateId(certificate), now, certificate.NotBefore, certificate.NotAfter)); 
                    return false;
                } 
 
                if (!StoreContainsCertificate(StoreName.TrustedPeople, certificate))
                { 
                    exception = new SecurityTokenValidationException(SR.GetString(SR.X509IsNotInTrustedStore,
                        SecurityUtils.GetCertificateId(certificate)));
                    return false;
                } 

                if (StoreContainsCertificate(StoreName.Disallowed, certificate)) 
                { 
                    exception = new SecurityTokenValidationException(SR.GetString(SR.X509IsInUntrustedStore,
                        SecurityUtils.GetCertificateId(certificate))); 
                    return false;
                }
                exception = null;
                return true; 
            }
        } 
 
        class ChainTrustValidator : X509CertificateValidator
        { 
            bool useMachineContext;
            X509ChainPolicy chainPolicy;
            uint chainPolicyOID = X509CertificateChain.DefaultChainPolicyOID;
 
            public ChainTrustValidator()
            { 
                this.chainPolicy = null; 
            }
 
            public ChainTrustValidator(bool useMachineContext, X509ChainPolicy chainPolicy, uint chainPolicyOID)
            {
                this.useMachineContext = useMachineContext;
                this.chainPolicy = chainPolicy; 
                this.chainPolicyOID = chainPolicyOID;
            } 
 
            public override void Validate(X509Certificate2 certificate)
            { 
                if (certificate == null)
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate");

                X509Chain chain = new X509Chain(this.useMachineContext, this.chainPolicyOID); 
                if (this.chainPolicy != null)
                { 
                    chain.ChainPolicy = this.chainPolicy; 
                }
 
                if (!chain.Build(certificate))
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenValidationException(SR.GetString(SR.X509ChainBuildFail,
                        SecurityUtils.GetCertificateId(certificate), GetChainStatusInformation(chain.ChainStatus)))); 
                }
            } 
 
            static string GetChainStatusInformation(X509ChainStatus[] chainStatus)
            { 
                if (chainStatus != null)
                {
                    StringBuilder error = new StringBuilder(128);
                    for (int i = 0; i < chainStatus.Length; ++i) 
                    {
                        error.Append(chainStatus[i].StatusInformation); 
                        error.Append(" "); 
                    }
                    return error.ToString(); 
                }
                return String.Empty;
            }
        } 

        class PeerOrChainTrustValidator : X509CertificateValidator 
        { 
            X509CertificateValidator chain;
            PeerTrustValidator peer; 

            public PeerOrChainTrustValidator()
            {
                this.chain = X509CertificateValidator.ChainTrust; 
                this.peer = (PeerTrustValidator)X509CertificateValidator.PeerTrust;
            } 
 
            public PeerOrChainTrustValidator(bool useMachineContext, X509ChainPolicy chainPolicy)
            { 
                this.chain = X509CertificateValidator.CreateChainTrustValidator(useMachineContext, chainPolicy);
                this.peer = (PeerTrustValidator)X509CertificateValidator.PeerTrust;
            }
 
            public override void Validate(X509Certificate2 certificate)
            { 
                if (certificate == null) 
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("certificate");
 
                Exception exception;
                if (this.peer.TryValidate(certificate, out exception))
                    return;
 
                try
                { 
                    this.chain.Validate(certificate); 
                }
                catch (SecurityTokenValidationException ex) 
                {
                    throw  DiagnosticUtility.ExceptionUtility.ThrowHelperError(new SecurityTokenValidationException(exception.Message + " " + ex.Message));
                }
            } 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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