ApplicationSecurityManager.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / Policy / ApplicationSecurityManager.cs / 1305376 / ApplicationSecurityManager.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
// 
 
//
// ApplicationSecurityManager.cs 
//

namespace System.Security.Policy {
    using System.Deployment.Internal.Isolation; 
    using System.Deployment.Internal.Isolation.Manifest;
    using System.IO; 
    using System.Runtime.Versioning; 
    using System.Security.Permissions;
    using System.Security.Util; 
    using System.Diagnostics.Contracts;
    using System.Reflection;

    [System.Runtime.InteropServices.ComVisible(true)] 
    public static class ApplicationSecurityManager {
        private static IApplicationTrustManager m_appTrustManager = null; 
 
        //
        // Public static methods. 
        //

        [System.Security.SecuritySafeCritical]  // auto-generated
        static ApplicationSecurityManager() 
        {
        } 
 
        [System.Security.SecurityCritical]  // auto-generated_required
        [SecurityPermissionAttribute(SecurityAction.Assert, Unrestricted=true)] 
        public static bool DetermineApplicationTrust (ActivationContext activationContext, TrustManagerContext context) {
            if (activationContext == null)
                throw new ArgumentNullException("activationContext");
            Contract.EndContractBlock(); 

            ApplicationTrust appTrust = null; 
            AppDomainManager domainManager = AppDomain.CurrentDomain.DomainManager; 
            if (domainManager != null) {
                HostSecurityManager securityManager = domainManager.HostSecurityManager; 
                if ((securityManager != null) && ((securityManager.Flags & HostSecurityManagerOptions.HostDetermineApplicationTrust) == HostSecurityManagerOptions.HostDetermineApplicationTrust)) {
                    appTrust = securityManager.DetermineApplicationTrust(CmsUtils.MergeApplicationEvidence(null, activationContext.Identity, activationContext, null), null, context);
                    if (appTrust == null)
                        return false; 
                    return appTrust.IsApplicationTrustedToRun;
                } 
            } 

            appTrust = DetermineApplicationTrustInternal(activationContext, context); 
            if (appTrust == null)
                return false;
            return appTrust.IsApplicationTrustedToRun;
        } 

        // 
        // Public static properties. 
        //
 
        public static ApplicationTrustCollection UserApplicationTrusts {
            [System.Security.SecuritySafeCritical]  // auto-generated
            [SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.ControlPolicy)]
            get { 
                return new ApplicationTrustCollection(true);
            } 
        } 

        public static IApplicationTrustManager ApplicationTrustManager { 
            [System.Security.SecuritySafeCritical]  // auto-generated
            [SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.ControlPolicy)]
            get {
                if (m_appTrustManager == null) { 
                    m_appTrustManager = DecodeAppTrustManager();
                    if (m_appTrustManager == null) 
                        throw new PolicyException(Environment.GetResourceString("Policy_NoTrustManager")); 
                }
                return m_appTrustManager; 
            }
        }

        // 
        // Internal
        // 
 
        [System.Security.SecurityCritical]  // auto-generated
        internal static ApplicationTrust DetermineApplicationTrustInternal (ActivationContext activationContext, TrustManagerContext context) { 
            ApplicationTrust trust = null;
            ApplicationTrustCollection userTrusts = new ApplicationTrustCollection(true);

            // See if there is a persisted trust decision for this application. 
            if ((context == null || !context.IgnorePersistedDecision)) {
                trust = userTrusts[activationContext.Identity.FullName]; 
                if (trust != null) 
                    return trust;
            } 

            // There is no cached trust decision so invoke the trust manager.
            trust = ApplicationTrustManager.DetermineApplicationTrust(activationContext, context);
            if (trust == null) 
                trust = new ApplicationTrust(activationContext.Identity);
            // make sure the application identity is correctly set. 
            trust.ApplicationIdentity = activationContext.Identity; 
            if (trust.Persist)
                userTrusts.Add(trust); 

            return trust;
        }
 
        //
        // Private. 
        // 

        private static string s_machineConfigFile = Config.MachineDirectory + "applicationtrust.config"; 

        [System.Security.SecurityCritical]  // auto-generated
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        private static IApplicationTrustManager DecodeAppTrustManager () {
            if (!File.InternalExists(s_machineConfigFile)) 
                goto defaultTrustManager; 

            // A config file exists. Decode the trust manager from its Xml. 
            String configFileStr;
            using (FileStream contents = new FileStream(s_machineConfigFile, FileMode.Open, FileAccess.Read))
            {
                configFileStr = new StreamReader(contents).ReadToEnd(); 
            }
 
            SecurityElement elRoot = SecurityElement.FromString(configFileStr); 
            SecurityElement elMscorlib = elRoot.SearchForChildByTag("mscorlib");
            if (elMscorlib == null) 
                goto defaultTrustManager;
            SecurityElement elSecurity = elMscorlib.SearchForChildByTag("security");
            if (elSecurity == null)
                goto defaultTrustManager; 
            SecurityElement elPolicy = elSecurity.SearchForChildByTag("policy");
            if (elPolicy == null) 
                goto defaultTrustManager; 
            SecurityElement elSecurityManager = elPolicy.SearchForChildByTag("ApplicationSecurityManager");
            if (elSecurityManager == null) 
                goto defaultTrustManager;
            SecurityElement elTrustManager = elSecurityManager.SearchForChildByTag("IApplicationTrustManager");
            if (elTrustManager == null)
                goto defaultTrustManager; 
            IApplicationTrustManager appTrustManager = DecodeAppTrustManagerFromElement(elTrustManager);
            if (appTrustManager == null) 
                goto defaultTrustManager; 
            return appTrustManager;
 
defaultTrustManager:
            return DecodeAppTrustManagerFromElement(CreateDefaultApplicationTrustManagerElement());
        }
 
        [System.Security.SecurityCritical]  // auto-generated
        private static SecurityElement CreateDefaultApplicationTrustManagerElement() { 
            SecurityElement elTrustManager = new SecurityElement("IApplicationTrustManager"); 
            elTrustManager.AddAttribute("class",
                                        "System.Security.Policy.TrustManager, System.Windows.Forms, Version=" + ((RuntimeAssembly)Assembly.GetExecutingAssembly()).GetVersion() + ", Culture=neutral, PublicKeyToken=" + AssemblyRef.EcmaPublicKeyToken); 
            elTrustManager.AddAttribute("version", "1");
            return elTrustManager;
        }
 
        [System.Security.SecurityCritical]  // auto-generated
        private static IApplicationTrustManager DecodeAppTrustManagerFromElement (SecurityElement elTrustManager) { 
            new ReflectionPermission(ReflectionPermissionFlag.MemberAccess).Assert(); 
            string trustManagerName = elTrustManager.Attribute("class");
            Type tmClass = Type.GetType(trustManagerName, false, false); 
            if (tmClass == null)
                return null;

            IApplicationTrustManager appTrustManager = Activator.CreateInstance(tmClass) as IApplicationTrustManager; 
            if (appTrustManager != null)
                appTrustManager.FromXml(elTrustManager); 
            return appTrustManager; 
        }
    } 
}

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

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