CodeAccessPermission.cs source code in C# .NET

                        
Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / whidbey / NetFxQFE / ndp / clr / src / BCL / System / Security / CodeAccessPermission.cs / 1 / 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 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
        [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);
        }

        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        public static void RevertDeny()
        { 
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            SecurityRuntime.RevertDeny(ref stackMark);
        } 

        [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); 
        } 

        [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). 
        [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);
            } 
        }
 
        [DynamicSecurityMethodAttribute()] 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        internal static void DemandInternal(PermissionType permissionType) 
        {
            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 

        [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);
        } 
 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        static internal void AssertAllPossible()
        {
            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
 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        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

        [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" ));
        } 
 
        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. 
            BCLDebug.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" );
 
            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();
        } 

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

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

        internal static bool CanUnrestrictedOverride(IPermission ip) 
        {
            if(CodeAccessSecurityEngine.DoesFullTrustMeanFullTrust()) 
                return true; 
            if(ip is IUnrestrictedPermission)
                return true; 
            return false;
        }
    }
} 

 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++== 
//
//   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 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
        [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);
        }

        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        public static void RevertDeny()
        { 
            StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; 
            SecurityRuntime.RevertDeny(ref stackMark);
        } 

        [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); 
        } 

        [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). 
        [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);
            } 
        }
 
        [DynamicSecurityMethodAttribute()] 
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        internal static void DemandInternal(PermissionType permissionType) 
        {
            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 

        [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);
        } 
 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable 
        static internal void AssertAllPossible()
        {
            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
 
        [DynamicSecurityMethodAttribute()]
        [MethodImplAttribute(MethodImplOptions.NoInlining)] // Methods containing StackCrawlMark local var has to be marked non-inlineable
        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

        [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" ));
        } 
 
        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. 
            BCLDebug.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" );
 
            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();
        } 

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

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

        internal static bool CanUnrestrictedOverride(IPermission ip) 
        {
            if(CodeAccessSecurityEngine.DoesFullTrustMeanFullTrust()) 
                return true; 
            if(ip is IUnrestrictedPermission)
                return true; 
            return false;
        }
    }
} 

 

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

                        

                        
                        

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