Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / SecurityRuntime.cs / 1 / SecurityRuntime.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Security { using System; using System.Globalization; using System.Threading; using System.Reflection; using System.Collections; using System.Runtime.CompilerServices; using System.Security.Permissions; internal class SecurityRuntime { private SecurityRuntime(){} // Returns the security object for the caller of the method containing // 'stackMark' on its frame. // // THE RETURNED OBJECT IS THE LIVE RUNTIME OBJECT. BE CAREFUL WITH IT! // // Internal only, do not doc. // [MethodImplAttribute(MethodImplOptions.InternalCall)] internal static extern FrameSecurityDescriptor GetSecurityObjectForFrame(ref StackCrawlMark stackMark, bool create); // Constants used to return status to native internal const bool StackContinue = true; internal const bool StackHalt = false; // Returns the number of negative overrides(deny/permitonly) in this secDesc private static int OverridesHelper(FrameSecurityDescriptor secDesc) { // check imperative int count = OverridesHelper2(secDesc, false); // add declarative count += OverridesHelper2(secDesc, true); return count; } private static int OverridesHelper2(FrameSecurityDescriptor secDesc, bool fDeclarative) { PermissionSet permSet; int count = 0; permSet = secDesc.GetPermitOnly(fDeclarative); if (permSet != null) count++; permSet = secDesc.GetDenials(fDeclarative); if (permSet != null) count++; return count; } // this method is a big perf hit, so don't call unnecessarily internal static MethodInfo GetMethodInfo(RuntimeMethodHandle rmh) { if(rmh.IsNullHandle()) return null; #if _DEBUG try { #endif // Assert here because reflection will check grants and if we fail the check, // there will be an infinite recursion that overflows the stack. PermissionSet.s_fullTrust.Assert(); RuntimeTypeHandle rth = rmh.GetDeclaringType(); return(System.RuntimeType.GetMethodBase(rth, rmh) as MethodInfo); #if _DEBUG } catch(Exception) { return null; } #endif } private static bool FrameDescSetHelper(FrameSecurityDescriptor secDesc, PermissionSet demandSet, out PermissionSet alteredDemandSet, RuntimeMethodHandle rmh) { return secDesc.CheckSetDemand(demandSet, out alteredDemandSet, rmh); } private static bool FrameDescHelper(FrameSecurityDescriptor secDesc, IPermission demandIn, PermissionToken permToken, RuntimeMethodHandle rmh) { return secDesc.CheckDemand((CodeAccessPermission) demandIn, permToken, rmh); } // // API for PermissionSets // internal static void Assert(PermissionSet permSet, ref StackCrawlMark stackMark) { // Note: if the "AssertPermission" is not a permission that implements IUnrestrictedPermission // you need to change the fourth parameter to a zero. FrameSecurityDescriptor secObj = CodeAccessSecurityEngine.CheckNReturnSO( CodeAccessSecurityEngine.AssertPermissionToken, CodeAccessSecurityEngine.AssertPermission, ref stackMark, 1, 1 ); BCLDebug.Assert(secObj != null || !SecurityManager._IsSecurityOn(),"Failure in SecurityRuntime.Assert() - secObj != null"); if (secObj == null) { if (SecurityManager._IsSecurityOn()) // Security: REQ_SQ flag is missing. Bad compiler ? throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } else { if (secObj.HasImperativeAsserts()) throw new SecurityException( Environment.GetResourceString( "Security_MustRevertOverride" ) ); secObj.SetAssert(permSet); } } internal static void AssertAllPossible(ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = SecurityRuntime.GetSecurityObjectForFrame(ref stackMark, true); BCLDebug.Assert(secObj != null || !SecurityManager._IsSecurityOn(),"Failure in SecurityRuntime.AssertAllPossible() - secObj != null"); if (secObj == null) { if (SecurityManager._IsSecurityOn()) // Security: REQ_SQ flag is missing. Bad compiler ? throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } else { if (secObj.GetAssertAllPossible()) throw new SecurityException( Environment.GetResourceString( "Security_MustRevertOverride" ) ); secObj.SetAssertAllPossible(); } } internal static void Deny(PermissionSet permSet, ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = SecurityRuntime.GetSecurityObjectForFrame(ref stackMark, true); BCLDebug.Assert(secObj != null || !SecurityManager._IsSecurityOn(),"Failure in SecurityRuntime.Deny() - secObj != null"); if (secObj == null) { if (SecurityManager._IsSecurityOn()) // Security: REQ_SQ flag is missing. Bad compiler ? throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } else { if (secObj.HasImperativeDenials()) throw new SecurityException( Environment.GetResourceString( "Security_MustRevertOverride" ) ); secObj.SetDeny(permSet); } } internal static void PermitOnly(PermissionSet permSet, ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = SecurityRuntime.GetSecurityObjectForFrame(ref stackMark, true); BCLDebug.Assert(secObj != null || !SecurityManager._IsSecurityOn(),"Failure in SecurityRuntime.PermitOnly() - secObj != null"); if (secObj == null) { if (SecurityManager._IsSecurityOn()) // Security: REQ_SQ flag is missing. Bad compiler ? throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } else { if (secObj.HasImperativeRestrictions()) throw new SecurityException( Environment.GetResourceString( "Security_MustRevertOverride" ) ); secObj.SetPermitOnly(permSet); } } // // Revert API // internal static void RevertAssert(ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = GetSecurityObjectForFrame(ref stackMark, false); if (secObj != null) { secObj.RevertAssert(); } else if (SecurityManager._IsSecurityOn()) throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } internal static void RevertDeny(ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = GetSecurityObjectForFrame(ref stackMark, false); if (secObj != null) { secObj.RevertDeny(); } else if (SecurityManager._IsSecurityOn()) throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } internal static void RevertPermitOnly(ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = GetSecurityObjectForFrame(ref stackMark, false); if (secObj != null) { secObj.RevertPermitOnly(); } else if (SecurityManager._IsSecurityOn()) throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } internal static void RevertAll(ref StackCrawlMark stackMark) { FrameSecurityDescriptor secObj = GetSecurityObjectForFrame(ref stackMark, false); if (secObj != null) { secObj.RevertAll(); } else if (SecurityManager._IsSecurityOn()) throw new ExecutionEngineException( Environment.GetResourceString( "ExecutionEngine_MissingSecurityDescriptor" ) ); } } }
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