Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / 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.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 public static void RevertAssert() { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; SecurityRuntime.RevertAssert(ref stackMark); } public static void RevertDeny() { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; SecurityRuntime.RevertDeny(ref stackMark); } public static void RevertPermitOnly() { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; SecurityRuntime.RevertPermitOnly(ref stackMark); } 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()] public void Demand() { if (!this.CheckDemand( null )) { StackCrawlMark stackMark = StackCrawlMark.LookForMyCallersCaller; CodeAccessSecurityEngine.Check(this, ref stackMark); } } [DynamicSecurityMethodAttribute()] 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()] public void Assert() { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; CodeAccessSecurityEngine.Assert(this, ref stackMark); } [DynamicSecurityMethodAttribute()] 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()] 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()] 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; } } }
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