SecurityRuntime.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 / 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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