CodeAccessPermission.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Security / CodeAccessPermission.cs / 1305376 / CodeAccessPermission.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// [....]
namespace System.Security 
{ 
    using System.IO;
    using System.Threading; 
    using System.Security;
    using System.Security.Util;
    using System.Security.Permissions;
    using System.Runtime.CompilerServices; 
    using System.Collections;
    using System.Text; 
    using System; 
    using  System.Diagnostics;
    using System.Diagnostics.Contracts; 
    using IUnrestrictedPermission = System.Security.Permissions.IUnrestrictedPermission;

    [Serializable]
    [SecurityPermissionAttribute( SecurityAction.InheritanceDemand, ControlEvidence = true, ControlPolicy = true )] 
[System.Runtime.InteropServices.ComVisible(true)]
    abstract public class CodeAccessPermission 
        : IPermission, ISecurityEncodable, IStackWalk 
    {
        // Static methods for manipulation of stack 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        public static void RevertAssert()
        { 
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
            SecurityRuntime.RevertAssert(ref stackMark); 
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        [Obsolete("Deny is obsolete and will be removed in a future release of the .NET Framework.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 static void RevertDeny()
        { 
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
            SecurityRuntime.RevertDeny(ref stackMark); 
        } 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        public static void RevertPermitOnly()
        {
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            SecurityRuntime.RevertPermitOnly(ref stackMark);
        } 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        public static void RevertAll()
        {
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
            SecurityRuntime.RevertAll(ref stackMark); 
        }
 
        // 
        // Standard implementation of IPermission methods for
        // code-access permissions. 
        //

        // Mark this method as requiring a security object on the caller's frame
        // so the caller won't be inlined (which would mess up stack crawling). 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [DynamicSecurityMethodAttribute()] 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        public void Demand()
        { 
            if (!this.CheckDemand( null ))
            {
                StackCrawlMark stackMark = StackCrawlMark.LookForMyCallersCaller;
                CodeAccessSecurityEngine.Check(this, ref stackMark); 
            }
        } 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [DynamicSecurityMethodAttribute()] 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        internal static void Demand(PermissionType permissionType)
        {
            //    The intent of the method is to be an internal mscorlib helper that Demands a specific permissiontype 
            //    without having to create objects.
            //    The security annotation fxcop rule that flags all methods with a Demand() has logic 
            //    which checks for methods named Demand in types that implement IPermission or IStackWalk. 
            Contract.Assert(new StackFrame().GetMethod().Name.Equals("Demand"), "This method needs to be named Demand");
 
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCallersCaller;
            CodeAccessSecurityEngine.SpecialDemand(permissionType, ref stackMark);
        }
 
        // Metadata for this method should be flaged with REQ_SQ so that
        // EE can allocate space on the stack frame for FrameSecurityDescriptor 
 
        [System.Security.SecuritySafeCritical]  // auto-generated
        [DynamicSecurityMethodAttribute()] 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        public void Assert()
        {
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            CodeAccessSecurityEngine.Assert(this, ref stackMark);
        } 
 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        static internal void Assert(bool allPossible)
        { 
            //    The intent of the method is to be an internal mscorlib helper that easily asserts for all possible permissions
            //    without having to new a PermissionSet. 
            //    The security annotation fxcop rule that flags all methods with an Assert() has logic 
            //    which checks for methods named Assert in types that implement IPermission or IStackWalk.
            Contract.Assert(new StackFrame().GetMethod().Name.Equals("Assert"), "This method needs to be named Assert"); 

            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller;
            SecurityRuntime.AssertAllPossible(ref stackMark);
        } 

        // Metadata for this method should be flaged with REQ_SQ so that 
        // EE can allocate space on the stack frame for FrameSecurityDescriptor 

        [System.Security.SecuritySafeCritical]  // auto-generated 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        [Obsolete("Deny is 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 void Deny() 
        {
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            CodeAccessSecurityEngine.Deny(this, ref stackMark); 
        }
 
        // Metadata for this method should be flaged with REQ_SQ so that
        // EE can allocate space on the stack frame for FrameSecurityDescriptor

        [System.Security.SecuritySafeCritical]  // auto-generated 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        public void PermitOnly() 
        {
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            CodeAccessSecurityEngine.PermitOnly(this, ref stackMark);
        }

        // IPermission interfaces 

        // We provide a default implementation of Union here. 
        // Any permission that doesn't provide its own representation 
        // of Union will get this one and trigger CompoundPermission
        // We can take care of simple cases here... 

        public virtual IPermission Union(IPermission other) {
            // The other guy could be null
            if (other == null) return(this.Copy()); 

            // otherwise we don't support it. 
            throw new NotSupportedException(Environment.GetResourceString( "NotSupported_SecurityPermissionUnion" )); 
        }
 
#if FEATURE_CAS_POLICY
        static internal SecurityElement CreatePermissionElement( IPermission perm, String permname )
        {
            SecurityElement root = new SecurityElement( "IPermission" ); 
            XMLUtil.AddClassAttribute( root, perm.GetType(), permname );
            // If you hit this assert then most likely you are trying to change the name of this class. 
            // This is ok as long as you change the hard coded string above and change the assert below. 
            Contract.Assert( perm.GetType().FullName.Equals( permname ), "Incorrect class name passed in! Was: " + permname + " Should be " + perm.GetType().FullName);
 
            root.AddAttribute( "version", "1" );
            return root;
        }
 
        static internal void ValidateElement( SecurityElement elem, IPermission perm )
        { 
            if (elem == null) 
                throw new ArgumentNullException( "elem" );
            Contract.EndContractBlock(); 

            if (!XMLUtil.IsPermissionElement( perm, elem ))
                throw new ArgumentException( Environment.GetResourceString( "Argument_NotAPermissionElement"));
 
            String version = elem.Attribute( "version" );
 
            if (version != null && !version.Equals( "1" )) 
                throw new ArgumentException( Environment.GetResourceString( "Argument_InvalidXMLBadVersion") );
        } 

        abstract public SecurityElement ToXml();
        abstract public void FromXml( SecurityElement elem );
 
        //
        // Unimplemented interface methods 
        // (as a reminder only) 
        //
 
        public override String ToString()
        {
            return ToXml().ToString();
        } 
#endif // FEATURE_CAS_POLICY
 
        // 
        // HELPERS FOR IMPLEMENTING ABSTRACT METHODS
        // 

        //
        // Protected helper
        // 

        internal bool VerifyType(IPermission perm) 
        { 
            // if perm is null, then obviously not of the same type
            if ((perm == null) || (perm.GetType() != this.GetType())) { 
                return(false);
            } else {
                return(true);
            } 
        }
 
        // The IPermission Interface 
        public abstract IPermission Copy();
        public abstract IPermission Intersect(IPermission target); 
        public abstract bool IsSubsetOf(IPermission target);

        [System.Runtime.InteropServices.ComVisible(false)]
        public override bool Equals(Object obj) 
        {
            IPermission perm = obj as IPermission; 
            if(obj != null && perm == null) 
                return false;
            try { 
                if(!this.IsSubsetOf(perm))
                    return false;
                if(perm != null && !perm.IsSubsetOf(this))
                    return false; 
            }
            catch (ArgumentException) 
            { 
                // Any argument exception implies inequality
                // Note that we require a try/catch block here because we have to deal with 
                // custom permissions that may throw exceptions indiscriminately.
                return false;
            }
            return true; 
        }
 
        [System.Runtime.InteropServices.ComVisible(false)] 
        public override int GetHashCode()
        { 
            // This implementation is only to silence a compiler warning.
            return base.GetHashCode();
        }
 

        internal bool CheckDemand(CodeAccessPermission grant) 
        { 
            Contract.Assert( grant == null || grant.GetType().Equals( this.GetType() ), "CheckDemand not defined for permissions of different type" );
            return IsSubsetOf( grant ); 
        }

        internal bool CheckPermitOnly(CodeAccessPermission permitted)
        { 
            Contract.Assert( permitted == null || permitted.GetType().Equals( this.GetType() ), "CheckPermitOnly not defined for permissions of different type" );
            return IsSubsetOf( permitted ); 
        } 

        internal bool CheckDeny(CodeAccessPermission denied) 
        {
            Contract.Assert( denied == null || denied.GetType().Equals( this.GetType() ), "CheckDeny not defined for permissions of different type" );
            IPermission intersectPerm = Intersect(denied);
            return (intersectPerm == null || intersectPerm.IsSubsetOf(null)); 
        }
 
        internal bool CheckAssert(CodeAccessPermission asserted) 
        {
            Contract.Assert( asserted == null || asserted.GetType().Equals( this.GetType() ), "CheckPermitOnly not defined for permissions of different type" ); 
            return IsSubsetOf( asserted );
        }
    }
} 

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK