HostSecurityManager.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / HostSecurityManager.cs / 1305376 / HostSecurityManager.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// A HostSecurityManager gives a hosting application the chance to 
// participate in the security decisions in the AppDomain.
//

namespace System.Security { 
    using System.Collections;
#if FEATURE_CLICKONCE 
    using System.Deployment.Internal.Isolation; 
    using System.Deployment.Internal.Isolation.Manifest;
    using System.Runtime.Hosting; 
#endif
    using System.Reflection;
    using System.Security;
    using System.Security.Permissions; 
    using System.Security.Policy;
    using System.Runtime.Versioning; 
    using System.Diagnostics.Contracts; 

 
[Serializable]
    [Flags]
    [System.Runtime.InteropServices.ComVisible(true)]
    public enum HostSecurityManagerOptions { 
        None                            = 0x0000,
        HostAppDomainEvidence           = 0x0001, 
        [Obsolete("AppDomain policy levels are obsolete and will be removed in a future release of the .NET Framework. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] 
        HostPolicyLevel                 = 0x0002,
        HostAssemblyEvidence            = 0x0004, 
        HostDetermineApplicationTrust   = 0x0008,
        HostResolvePolicy               = 0x0010,
        AllFlags                        = 0x001F
    } 

    [System.Security.SecurityCritical]  // auto-generated_required 
    [Serializable] 
    [SecurityPermissionAttribute(SecurityAction.InheritanceDemand, Flags=SecurityPermissionFlag.Infrastructure)]
    [System.Runtime.InteropServices.ComVisible(true)] 
    public class HostSecurityManager {
        public HostSecurityManager () {}

        // The host can choose which events he wants to participate in. This property can be set when 
        // the host only cares about a subset of the capabilities exposed through the HostSecurityManager.
        public virtual HostSecurityManagerOptions Flags { 
            get { 
                // We use AllFlags as the default.
                return HostSecurityManagerOptions.AllFlags; 
            }
        }

#if FEATURE_CAS_POLICY 
        // provide policy for the AppDomain.
        [Obsolete("AppDomain policy levels are obsolete and will be removed in a future release of the .NET Framework. See http://go.microsoft.com/fwlink/?LinkID=155570 for more information.")] 
        public virtual PolicyLevel DomainPolicy { 
            get {
                if (!AppDomain.CurrentDomain.IsLegacyCasPolicyEnabled) 
                {
                    throw new NotSupportedException(Environment.GetResourceString("NotSupported_RequiresCasPolicyExplicit"));
                }
 
                return null;
            } 
        } 
#endif
        public virtual Evidence ProvideAppDomainEvidence (Evidence inputEvidence) { 
            // The default implementation does not modify the input evidence.
            return inputEvidence;
        }
 
        public virtual Evidence ProvideAssemblyEvidence (Assembly loadedAssembly, Evidence inputEvidence) {
            // The default implementation does not modify the input evidence. 
            return inputEvidence; 
        }
 
#if !FEATURE_PAL && FEATURE_CLICKONCE
        [System.Security.SecurityCritical]  // auto-generated
        [SecurityPermissionAttribute(SecurityAction.Assert, Unrestricted=true)]
        [ResourceExposure(ResourceScope.None)] 
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
        public virtual ApplicationTrust DetermineApplicationTrust(Evidence applicationEvidence, Evidence activatorEvidence, TrustManagerContext context) 
        { 
            if (applicationEvidence == null)
                throw new ArgumentNullException("applicationEvidence"); 
            Contract.EndContractBlock();

            // This method looks for a trust decision for the ActivationContext in three locations, in order
            // of preference: 
            //
            // 1. Supplied by the host in the AppDomainSetup. If the host supplied a decision this way, it 
            //    will be in the applicationEvidence. 
            // 2. Reuse the ApplicationTrust from the current AppDomain
            // 3. Ask the TrustManager for a trust decision 

            // get the activation context from the application evidence.
            // The default HostSecurityManager does not examine the activatorEvidence
            // but other security managers could use it to figure out the 
            // evidence of the domain attempting to activate the application.
 
            ActivationArguments activationArgs = applicationEvidence.GetHostEvidence(); 
            if (activationArgs == null)
                throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence")); 

            ActivationContext actCtx = activationArgs.ActivationContext;
            if (actCtx == null)
                throw new ArgumentException(Environment.GetResourceString("Policy_MissingActivationContextInAppEvidence")); 

            // Make sure that any ApplicationTrust we find applies to the ActivationContext we're 
            // creating the new AppDomain for. 
            ApplicationTrust appTrust = applicationEvidence.GetHostEvidence();
            if (appTrust != null && 
                !CmsUtils.CompareIdentities(appTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion))
            {
                appTrust = null;
            } 

            // If there was not a trust decision supplied in the Evidence, we can reuse the existing trust 
            // decision from this domain if its identity matches the ActivationContext of the new domain. 
            // Otherwise consult the TrustManager for a trust decision
            if (appTrust == null) 
            {
                if (AppDomain.CurrentDomain.ApplicationTrust != null &&
                    CmsUtils.CompareIdentities(AppDomain.CurrentDomain.ApplicationTrust.ApplicationIdentity, activationArgs.ApplicationIdentity, ApplicationVersionMatch.MatchExactVersion))
                { 
                    appTrust = AppDomain.CurrentDomain.ApplicationTrust;
                } 
                else 
                {
                    appTrust = ApplicationSecurityManager.DetermineApplicationTrustInternal(actCtx, context); 
                }
            }

            // If the trust decision allows the application to run, then it should also have a permission set 
            // which is at least the permission set the application requested.
            ApplicationSecurityInfo appRequest = new ApplicationSecurityInfo(actCtx); 
            if (appTrust != null && 
                appTrust.IsApplicationTrustedToRun &&
                !appRequest.DefaultRequestSet.IsSubsetOf(appTrust.DefaultGrantSet.PermissionSet)) 
            {
                throw new InvalidOperationException(Environment.GetResourceString("Policy_AppTrustMustGrantAppRequest"));
            }
 
                return appTrust;
        } 
#endif //!FEATURE_PAL && FEATURE_CLICKONCE 

#if FEATURE_CAS_POLICY 
        // Query the CLR to see what it would have granted a specific set of evidence
        public virtual PermissionSet ResolvePolicy(Evidence evidence)
        {
            if (evidence == null) 
                throw new ArgumentNullException("evidence");
            Contract.EndContractBlock(); 
 
            //
            // If the evidence is from the GAC then the result is full trust. 
            // In a homogenous domain, then the application trust object provides the grant set.
            // When CAS policy is disabled, the result is full trust.
            // Otherwise, the result comes from evaluating CAS policy.
            // 

            if (evidence.GetHostEvidence() != null) 
            { 
                return new PermissionSet(PermissionState.Unrestricted);
            } 
            else if (AppDomain.CurrentDomain.IsHomogenous)
            {
                return AppDomain.CurrentDomain.GetHomogenousGrantSet(evidence);
            } 
            else if (!AppDomain.CurrentDomain.IsLegacyCasPolicyEnabled)
            { 
                return new PermissionSet(PermissionState.Unrestricted); 
            }
            else 
            {
                return SecurityManager.PolicyManager.CodeGroupResolve(evidence, false);
            }
        } 
#endif
 
        ///  
        ///     Determine what types of evidence the host might be able to supply for the AppDomain if requested
        ///  
        /// 
        public virtual Type[] GetHostSuppliedAppDomainEvidenceTypes() {
            return null;
        } 

        ///  
        ///     Determine what types of evidence the host might be able to supply for an assembly if requested 
        /// 
        public virtual Type[] GetHostSuppliedAssemblyEvidenceTypes(Assembly assembly) { 
            return null;
        }

        ///  
        ///     Ask the host to supply a specific type of evidence for the AppDomain
        ///  
        public virtual EvidenceBase GenerateAppDomainEvidence(Type evidenceType) { 
            return null;
        } 

        /// 
        ///     Ask the host to supply a specific type of evidence for an assembly
        ///  
        public virtual EvidenceBase GenerateAssemblyEvidence(Type evidenceType, Assembly assembly) {
            return null; 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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HostSecurityManager.cs source code in C# .NET

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