Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Threading / CompressedStack.cs / 3 / CompressedStack.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================================== ** ** Class: CompressedStack ** ** Purpose: Managed wrapper for the security stack compression implementation ** =============================================================================*/ namespace System.Threading { using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Runtime.ConstrainedExecution; using System.Reflection; using System.Collections; using System.Threading; using System.Runtime.Serialization; internal struct CompressedStackSwitcher: IDisposable { internal CompressedStack curr_CS; internal CompressedStack prev_CS; internal IntPtr prev_ADStack; public override bool Equals(Object obj) { if (obj == null || !(obj is CompressedStackSwitcher)) return false; CompressedStackSwitcher sw = (CompressedStackSwitcher)obj; return (this.curr_CS == sw.curr_CS && this.prev_CS == sw.prev_CS && this.prev_ADStack == sw.prev_ADStack); } public override int GetHashCode() { return ToString().GetHashCode(); } public static bool operator ==(CompressedStackSwitcher c1, CompressedStackSwitcher c2) { return c1.Equals(c2); } public static bool operator !=(CompressedStackSwitcher c1, CompressedStackSwitcher c2) { return !c1.Equals(c2); } ///void IDisposable.Dispose() { Undo(); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] internal bool UndoNoThrow() { try { Undo(); } catch { return false; } return true; } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] public void Undo() { if (curr_CS == null && prev_CS == null) return; if (prev_ADStack != (IntPtr)0) CompressedStack.RestoreAppDomainStack(prev_ADStack); CompressedStack.SetCompressedStackThread(prev_CS); prev_CS = null; curr_CS = null; prev_ADStack = (IntPtr)0; } } internal class SafeCompressedStackHandle : SafeHandle { public SafeCompressedStackHandle() : base(IntPtr.Zero, true) { } public override bool IsInvalid { get { return handle == IntPtr.Zero; } } override protected bool ReleaseHandle() { CompressedStack.DestroyDelayedCompressedStack(handle); handle = IntPtr.Zero; return true; } } [Serializable()] public sealed class CompressedStack:ISerializable { private PermissionListSet m_pls; private SafeCompressedStackHandle m_csHandle; internal PermissionListSet PLS { get { return m_pls; } } internal CompressedStack( SafeCompressedStackHandle csHandle ) { m_csHandle = csHandle; } private CompressedStack(SafeCompressedStackHandle csHandle, PermissionListSet pls) { this.m_csHandle = csHandle; this.m_pls = pls; } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.SerializationFormatter)] public void GetObjectData(SerializationInfo info, StreamingContext context) { if (info==null) throw new ArgumentNullException("info"); CompleteConstruction(null); info.AddValue("PLS", this.m_pls); } private CompressedStack(SerializationInfo info, StreamingContext context) { this.m_pls = (PermissionListSet)info.GetValue("PLS", typeof(PermissionListSet)); } internal SafeCompressedStackHandle CompressedStackHandle { [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] get { return m_csHandle; } } [StrongNameIdentityPermissionAttribute(SecurityAction.LinkDemand, PublicKey = "0x00000000000000000400000000000000"), SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)] public static CompressedStack GetCompressedStack() { // This is a Capture() StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; return CompressedStack.GetCompressedStack(ref stackMark); } internal static CompressedStack GetCompressedStack(ref StackCrawlMark stackMark) { CompressedStack cs; CompressedStack innerCS = null; if (CodeAccessSecurityEngine.QuickCheckForAllDemands()) { cs = new CompressedStack(null); } else if (CodeAccessSecurityEngine.AllDomainsHomogeneousWithNoStackModifiers()) { // if all AppDomains on the stack are homogeneous, we don't need to walk the stack // however, we do need to capture the AppDomain stack. cs = new CompressedStack(GetDelayedCompressedStack(ref stackMark, false)); cs.m_pls = PermissionListSet.CreateCompressedState_HG(); } else { // regular stackwalking case cs = new CompressedStack(GetDelayedCompressedStack( ref stackMark, true )); if (cs.CompressedStackHandle != null && IsImmediateCompletionCandidate(cs.CompressedStackHandle, out innerCS)) { cs.CompleteConstruction(innerCS); DestroyDCSList(cs.CompressedStackHandle); } } return cs; } public static CompressedStack Capture() { StackCrawlMark stackMark = StackCrawlMark.LookForMyCaller; return GetCompressedStack(ref stackMark); } [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure), DynamicSecurityMethodAttribute()] public static void Run(CompressedStack compressedStack, ContextCallback callback, Object state) { if (compressedStack == null ) { throw new ArgumentException(Environment.GetResourceString("Arg_NamedParamNull"),"compressedStack"); } if (cleanupCode == null) { tryCode = new RuntimeHelpers.TryCode(runTryCode); cleanupCode = new RuntimeHelpers.CleanupCode(runFinallyCode); } CompressedStackRunData runData = new CompressedStackRunData(compressedStack, callback, state); RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(tryCode, cleanupCode, runData); } internal class CompressedStackRunData { internal CompressedStack cs; internal ContextCallback callBack; internal Object state; internal CompressedStackSwitcher cssw; internal CompressedStackRunData(CompressedStack cs, ContextCallback cb, Object state) { this.cs = cs; this.callBack = cb; this.state = state; this.cssw = new CompressedStackSwitcher(); } } static internal void runTryCode(Object userData) { CompressedStackRunData rData = (CompressedStackRunData) userData; rData.cssw = SetCompressedStack(rData.cs, GetCompressedStackThread()); rData.callBack(rData.state); } [PrePrepareMethod] static internal void runFinallyCode(Object userData, bool exceptionThrown) { CompressedStackRunData rData = (CompressedStackRunData) userData; rData.cssw.Undo(); } static internal RuntimeHelpers.TryCode tryCode; static internal RuntimeHelpers.CleanupCode cleanupCode; internal static CompressedStackSwitcher SetCompressedStack(CompressedStack cs, CompressedStack prevCS) { CompressedStackSwitcher cssw = new CompressedStackSwitcher(); RuntimeHelpers.PrepareConstrainedRegions(); try { // Order is important in this block. // Also, we dont want any THreadAborts happening when we try to set it RuntimeHelpers.PrepareConstrainedRegions(); try { // Empty try block to ensure no ThreadAborts in the finally block } finally { // SetCompressedStackThread can throw - only if it suceeds we shd update the switcher and overrides SetCompressedStackThread(cs); cssw.prev_CS = prevCS; cssw.curr_CS = cs; cssw.prev_ADStack = SetAppDomainStack(cs); } } catch { cssw.UndoNoThrow(); throw; // throw the original exception } return cssw; } [ComVisible(false)] public CompressedStack CreateCopy() { return new CompressedStack(this.m_csHandle, this.m_pls); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] internal static IntPtr SetAppDomainStack(CompressedStack cs) { //Update the AD Stack on the thread and return the previous AD Stack return Thread.CurrentThread.SetAppDomainStack((cs == null ? null:cs.CompressedStackHandle)); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] internal static void RestoreAppDomainStack(IntPtr appDomainStack) { Thread.CurrentThread.RestoreAppDomainStack(appDomainStack); //Restore the previous AD Stack } internal static CompressedStack GetCompressedStackThread() { ExecutionContext ec = Thread.CurrentThread.GetExecutionContextNoCreate(); if (ec != null && ec.SecurityContext != null) return ec.SecurityContext.CompressedStack; return null; } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)] internal static void SetCompressedStackThread(CompressedStack cs) { ExecutionContext ec = Thread.CurrentThread.ExecutionContext; if (ec.SecurityContext != null) ec.SecurityContext.CompressedStack = cs; else if (cs != null) { SecurityContext sc = new SecurityContext(); sc.CompressedStack = cs; ec.SecurityContext = sc; } } internal bool CheckDemand(CodeAccessPermission demand, PermissionToken permToken, RuntimeMethodHandle rmh) { CompleteConstruction(null); if (PLS == null) return SecurityRuntime.StackHalt; else return PLS.CheckDemand(demand, permToken, rmh); } internal bool CheckSetDemand(PermissionSet pset , RuntimeMethodHandle rmh) { CompleteConstruction(null); if (PLS == null) return SecurityRuntime.StackHalt; else return PLS.CheckSetDemand(pset, rmh); } /// /// Demand which succeeds if either a set of special permissions or a permission set is granted /// to the call stack /// /// set of flags to check (See PermissionType) /// alternate permission set to check internal void DemandFlagsOrGrantSet(int flags, PermissionSet grantSet) { CompleteConstruction(null); if (PLS == null) return; PLS.DemandFlagsOrGrantSet(flags, grantSet); } internal void GetZoneAndOrigin(ArrayList zoneList, ArrayList originList, PermissionToken zoneToken, PermissionToken originToken) { CompleteConstruction(null); if (PLS != null) PLS.GetZoneAndOrigin(zoneList,originList,zoneToken,originToken); return; } internal void CompleteConstruction(CompressedStack innerCS) { if (PLS != null) return; PermissionListSet pls = PermissionListSet.CreateCompressedState(this, innerCS); lock (this) { if (PLS == null) m_pls = pls; } } [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static SafeCompressedStackHandle GetDelayedCompressedStack(ref StackCrawlMark stackMark, bool walkStack); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static void DestroyDelayedCompressedStack( IntPtr unmanagedCompressedStack ); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static void DestroyDCSList( SafeCompressedStackHandle compressedStack ); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static int GetDCSCount(SafeCompressedStackHandle compressedStack); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static bool IsImmediateCompletionCandidate(SafeCompressedStackHandle compressedStack, out CompressedStack innerCS); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static DomainCompressedStack GetDomainCompressedStack(SafeCompressedStackHandle compressedStack, int index); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static void GetHomogeneousPLS(PermissionListSet hgPLS); } //********************************************************* // New Implementation of CompressedStack creation/demand eval - NewCompressedStack/DomainCompressedStack //********************************************************* [Serializable()] internal sealed class DomainCompressedStack { // Managed equivalent of DomainCompressedStack - used to perform demand evaluation private PermissionListSet m_pls; // Did we terminate construction on this DCS and therefore, should we terminate construction on the rest of the CS? private bool m_bHaltConstruction; // CompresedStack interacts with this class purely through the three properties marked internal // Zone, Origin, AGRList. internal PermissionListSet PLS { get { return m_pls; } } internal bool ConstructionHalted { get { return m_bHaltConstruction; } } // Called from the VM only. private static DomainCompressedStack CreateManagedObject(IntPtr unmanagedDCS) { DomainCompressedStack newDCS = new DomainCompressedStack(); newDCS.m_pls = PermissionListSet.CreateCompressedState(unmanagedDCS, out newDCS.m_bHaltConstruction); // return the created object return newDCS; } [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static int GetDescCount(IntPtr dcs); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static void GetDomainPermissionSets(IntPtr dcs, out PermissionSet granted, out PermissionSet refused); // returns true if the descriptor is a FrameSecurityDescriptor [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static bool GetDescriptorInfo(IntPtr dcs, int index, out PermissionSet granted, out PermissionSet refused, out Assembly assembly, out FrameSecurityDescriptor fsd); [MethodImplAttribute(MethodImplOptions.InternalCall)] internal extern static bool IgnoreDomain(IntPtr dcs); } }
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