ApplicationSecurityManager.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / ApplicationSecurityManager.cs / 1 / 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; 

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

        // 
        // Public static methods.
        // 
 
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.ControlPolicy | SecurityPermissionFlag.ControlEvidence)]
        [SecurityPermissionAttribute(SecurityAction.Assert, Unrestricted=true)] 
        public static bool DetermineApplicationTrust (ActivationContext activationContext, TrustManagerContext context) {
            if (activationContext == null)
                throw new ArgumentNullException("activationContext");
 
            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 { 
            [SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.ControlPolicy)]
            get {
                return new ApplicationTrustCollection(true);
            } 
        }
 
        public static IApplicationTrustManager ApplicationTrustManager { 
            [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
        //
 
        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";
 
        [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. 
            FileStream contents = new FileStream(s_machineConfigFile, FileMode.Open, FileAccess.Read);
 
            SecurityElement elRoot = SecurityElement.FromString(new StreamReader(contents).ReadToEnd()); 
            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());
        }
 
        private static SecurityElement CreateDefaultApplicationTrustManagerElement() {
            SecurityElement elTrustManager = new SecurityElement("IApplicationTrustManager"); 
            elTrustManager.AddAttribute("class", 
                                        "System.Security.Policy.TrustManager, System.Windows.Forms, Version=" + System.Reflection.Assembly.GetExecutingAssembly().GetVersion() + ", Culture=neutral, PublicKeyToken=" + AssemblyRef.EcmaPublicKeyToken);
            elTrustManager.AddAttribute("version", "1"); 
            return elTrustManager;
        }

        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;
        } 
    } 
}

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