// (C) Ximian, Inc. http://www.ximian.com
// Copyright (C) 2001 Nick Drochak, All Rights Reserved
// Portions (C) 2004 Motus Technologies Inc. (http://www.motus.com)
-// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
+// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
using System.Diagnostics;
using System.Globalization;
using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
using System.Security.Permissions;
-using System.Text;
+using System.Threading;
namespace System.Security {
[Serializable]
+ [SecurityPermission (SecurityAction.InheritanceDemand, ControlEvidence = true, ControlPolicy = true)]
+ [ComVisible (true)]
+ [MonoTODO ("CAS support is experimental (and unsupported).")]
public abstract class CodeAccessPermission : IPermission, ISecurityEncodable, IStackWalk {
+
protected CodeAccessPermission ()
{
}
- // LAMESPEC: Documented as virtual
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public void Assert ()
{
- // Not everyone can assert freely so we must check for
- // System.Security.Permissions.SecurityPermissionFlag.Assertion
- new SecurityPermission (SecurityPermissionFlag.Assertion).Demand ();
-
- // TODO: Only one Assert can be active in a stack frame
- // throw new SecurityException (Locale.GetText (
- // "Only one Assert can be active in a stack frame"));
+ new PermissionSet (this).Assert ();
}
-#if NET_2_0
- public
-#else
- internal
-#endif
- virtual bool CheckAssert (CodeAccessPermission asserted)
+ internal bool CheckAssert (CodeAccessPermission asserted)
{
if (asserted == null)
return false;
- if (asserted.GetType() != this.GetType ())
+ if (asserted.GetType () != this.GetType ())
return false;
return IsSubsetOf (asserted);
}
-#if NET_2_0
- public
-#else
- internal
-#endif
- virtual bool CheckDemand (CodeAccessPermission target)
+ internal bool CheckDemand (CodeAccessPermission target)
{
if (target == null)
return false;
return IsSubsetOf (target);
}
-#if NET_2_0
- public
-#else
- internal
-#endif
- virtual bool CheckDeny (CodeAccessPermission denied)
+ internal bool CheckDeny (CodeAccessPermission denied)
{
if (denied == null)
return true;
- if (denied.GetType () != this.GetType ())
+ Type t = denied.GetType ();
+ if (t != this.GetType ())
return true;
- return (Intersect (denied) == null);
+ IPermission inter = Intersect (denied);
+ if (inter == null)
+ return true;
+ // sadly that's not enough :( at this stage we must also check
+ // if an empty (PermissionState.None) is a subset of the denied
+ // (which is like a empty intersection looks like for flag based
+ // permissions, e.g. AspNetHostingPermission).
+ return denied.IsSubsetOf (PermissionBuilder.Create (t));
}
-#if NET_2_0
- public
-#else
- internal
-#endif
- virtual bool CheckPermitOnly (CodeAccessPermission target)
+ internal bool CheckPermitOnly (CodeAccessPermission target)
{
if (target == null)
return false;
public abstract IPermission Copy ();
- // LAMESPEC: Documented as virtual
- [MonoTODO ("Assert, Deny and PermitOnly aren't yet supported")]
public void Demand ()
{
+ // note: here we're sure it's a CAS demand
if (!SecurityManager.SecurityEnabled)
return;
- Assembly a = null;
- StackTrace st = new StackTrace (1); // skip ourself
- StackFrame[] frames = st.GetFrames ();
- foreach (StackFrame sf in frames) {
- MethodBase mb = sf.GetMethod ();
- // declarative security checks, when present, must be checked
- // for each stack frame
- if ((MethodAttributes.HasSecurity & mb.Attributes) == MethodAttributes.HasSecurity) {
- // TODO
- }
- // however the "final" grant set is resolved by assembly, so
- // there's no need to check it every time (just when we're
- // changing assemblies between frames).
- Assembly af = mb.ReflectedType.Assembly;
- if (a != af) {
- a = af;
- if (!a.Demand (this)) {
- Type t = this.GetType ();
- throw new SecurityException ("Demand failed", t);
- }
- }
- }
+ // skip frames until we get the caller (of our caller)
+ new PermissionSet (this).CasOnlyDemand (3);
}
- // LAMESPEC: Documented as virtual
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public void Deny ()
{
+ new PermissionSet (this).Deny ();
}
-#if NET_2_0
- [MonoTODO]
+ [ComVisible (false)]
public override bool Equals (object obj)
{
if (obj == null)
return false;
if (obj.GetType () != this.GetType ())
return false;
- // TODO: compare
- return true;
+ CodeAccessPermission cap = (obj as CodeAccessPermission);
+ return (IsSubsetOf (cap) && cap.IsSubsetOf (this));
}
-#endif
public abstract void FromXml (SecurityElement elem);
-#if NET_2_0
- [MonoTODO]
+ [ComVisible (false)]
public override int GetHashCode ()
{
return base.GetHashCode ();
}
-#endif
public abstract IPermission Intersect (IPermission target);
return null;
}
- // LAMESPEC: Documented as virtual
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public void PermitOnly ()
{
+ new PermissionSet (this).PermitOnly ();
}
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public static void RevertAll ()
{
+ if (!SecurityManager.SecurityEnabled)
+ return;
+
+ SecurityFrame sf = new SecurityFrame (1);
+ bool revert = false;
+ if ((sf.Assert != null) && !sf.Assert.DeclarativeSecurity) {
+ revert = true;
+ throw new NotSupportedException ("Currently only declarative Assert are supported.");
+ }
+ if ((sf.Deny != null) && !sf.Deny.DeclarativeSecurity) {
+ revert = true;
+ throw new NotSupportedException ("Currently only declarative Deny are supported.");
+ }
+ if ((sf.PermitOnly != null) && !sf.PermitOnly.DeclarativeSecurity) {
+ revert = true;
+ throw new NotSupportedException ("Currently only declarative PermitOnly are supported.");
+ }
+
+ if (!revert) {
+ string msg = Locale.GetText ("No stack modifiers are present on the current stack frame.");
+ // FIXME: we don't (yet) support imperative stack modifiers
+ msg += Environment.NewLine + "Currently only declarative stack modifiers are supported.";
+ throw new ExecutionEngineException (msg);
+ }
}
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public static void RevertAssert ()
{
+ if (!SecurityManager.SecurityEnabled)
+ return;
+
+ SecurityFrame sf = new SecurityFrame (1);
+ if ((sf.Assert != null) && !sf.Assert.DeclarativeSecurity) {
+ throw new NotSupportedException ("Currently only declarative Assert are supported.");
+ } else {
+ // we can't revert declarative security (or an empty frame) imperatively
+ ThrowExecutionEngineException (SecurityAction.Assert);
+ }
}
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public static void RevertDeny ()
{
+ if (!SecurityManager.SecurityEnabled)
+ return;
+
+ SecurityFrame sf = new SecurityFrame (1);
+ if ((sf.Deny != null) && !sf.Deny.DeclarativeSecurity) {
+ throw new NotSupportedException ("Currently only declarative Deny are supported.");
+ } else {
+ // we can't revert declarative security (or an empty frame) imperatively
+ ThrowExecutionEngineException (SecurityAction.Deny);
+ }
}
- [MonoTODO]
+ [MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public static void RevertPermitOnly ()
{
+ if (!SecurityManager.SecurityEnabled)
+ return;
+
+ SecurityFrame sf = new SecurityFrame (1);
+ if ((sf.PermitOnly != null) && sf.PermitOnly.DeclarativeSecurity) {
+ throw new NotSupportedException ("Currently only declarative PermitOnly are supported.");
+ } else {
+ // we can't revert declarative security (or an empty frame) imperatively
+ ThrowExecutionEngineException (SecurityAction.PermitOnly);
+ }
}
// Internal helpers methods
internal static PermissionState CheckPermissionState (PermissionState state, bool allowUnrestricted)
{
+ string msg;
switch (state) {
case PermissionState.None:
break;
case PermissionState.Unrestricted:
- if (!allowUnrestricted) {
- string msg = Locale.GetText ("Unrestricted isn't not allowed for identity permissions.");
- throw new ArgumentException (msg, "state");
- }
+ // unrestricted permissions are possible for identiy permissions
break;
default:
- string msg = String.Format (Locale.GetText ("Invalid enum {0}"), state);
+ msg = String.Format (Locale.GetText ("Invalid enum {0}"), state);
throw new ArgumentException (msg, "state");
}
return state;
return (String.Compare (value, Boolean.TrueString, true, CultureInfo.InvariantCulture) == 0);
}
+ internal bool ProcessFrame (SecurityFrame frame)
+ {
+ // 1. CheckPermitOnly
+ if (frame.PermitOnly != null) {
+ // the demanded permission must be in one of the permitted...
+ bool permit = frame.PermitOnly.IsUnrestricted ();
+ if (!permit) {
+ // check individual permissions
+ foreach (IPermission p in frame.PermitOnly) {
+ if (CheckPermitOnly (p as CodeAccessPermission)) {
+ permit = true;
+ break;
+ }
+ }
+ }
+ if (!permit) {
+ // ...or else we throw
+ ThrowSecurityException (this, "PermitOnly", frame, SecurityAction.Demand, null);
+ }
+ }
+
+ // 2. CheckDeny
+ if (frame.Deny != null) {
+ // special case where everything is denied (i.e. no child to be processed)
+ if (frame.Deny.IsUnrestricted ())
+ ThrowSecurityException (this, "Deny", frame, SecurityAction.Demand, null);
+ foreach (IPermission p in frame.Deny) {
+ if (!CheckDeny (p as CodeAccessPermission))
+ ThrowSecurityException (this, "Deny", frame, SecurityAction.Demand, p);
+ }
+ }
+
+ // 3. CheckAssert
+ if (frame.Assert != null) {
+ if (frame.Assert.IsUnrestricted ())
+ return true; // remove permission and continue stack walk
+ foreach (IPermission p in frame.Assert) {
+ if (CheckAssert (p as CodeAccessPermission)) {
+ return true; // remove permission and continue stack walk
+ }
+ }
+ }
+
+ // continue the stack walk
+ return false;
+ }
+
internal static void ThrowInvalidPermission (IPermission target, Type expected)
{
string msg = Locale.GetText ("Invalid permission type '{0}', expected type '{1}'.");
msg = String.Format (msg, target.GetType (), expected);
throw new ArgumentException (msg, "target");
}
+
+ internal static void ThrowExecutionEngineException (SecurityAction stackmod)
+ {
+ string msg = Locale.GetText ("No {0} modifier is present on the current stack frame.");
+ // FIXME: we don't (yet) support imperative stack modifiers
+ msg += Environment.NewLine + "Currently only declarative stack modifiers are supported.";
+ throw new ExecutionEngineException (String.Format (msg, stackmod));
+ }
+
+ internal static void ThrowSecurityException (object demanded, string message, SecurityFrame frame,
+ SecurityAction action, IPermission failed)
+ {
+#if NET_2_1
+ throw new SecurityException (message);
+#else
+ Assembly a = frame.Assembly;
+ throw new SecurityException (Locale.GetText (message),
+ a.UnprotectedGetName (), a.GrantedPermissionSet,
+ a.DeniedPermissionSet, frame.Method, action, demanded,
+ failed, a.UnprotectedGetEvidence ());
+#endif
+ }
}
}
projects / mono.git / blobdiff