Imported Upstream version 3.10.0

Former-commit-id: 172c8e3c300b39d5785c7a3e8dfb08ebdbc1a99b

external/ikvm/runtime/openjdk/java.security.cs

@@ -0,0 +1,154 @@
+/*
+  Copyright (C) 2007-2013 Jeroen Frijters
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+
+  Jeroen Frijters
+  jeroen@frijters.net
+  
+*/
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Reflection;
+using IKVM.Internal;
+
+static class Java_java_security_AccessController
+{
+	public static object getStackAccessControlContext(java.security.AccessControlContext context, ikvm.@internal.CallerID callerID)
+	{
+#if FIRST_PASS
+		return null;
+#else
+		List<java.security.ProtectionDomain> array = new List<java.security.ProtectionDomain>();
+		bool is_privileged = GetProtectionDomains(array, callerID, new StackTrace(1));
+		if (array.Count == 0)
+		{
+			if (is_privileged && context == null)
+			{
+				return null;
+			}
+		}
+		return CreateAccessControlContext(array, is_privileged, context);
+#endif
+	}
+
+#if !FIRST_PASS
+	private static bool GetProtectionDomains(List<java.security.ProtectionDomain> array, ikvm.@internal.CallerID callerID, StackTrace stack)
+	{
+		// first we have to skip all AccessController related frames, because we can be called from a doPrivileged implementation (not the privileged action)
+		// in which case we should ignore the doPrivileged frame
+		int skip = 0;
+		for (; skip < stack.FrameCount; skip++)
+		{
+			Type type  = stack.GetFrame(skip).GetMethod().DeclaringType;
+			if (type != typeof(Java_java_security_AccessController) && type != typeof(java.security.AccessController))
+			{
+				break;
+			}
+		}
+		java.security.ProtectionDomain previous_protection_domain = null;
+		for (int i = skip; i < stack.FrameCount; i++)
+		{
+			bool is_privileged = false;
+			java.security.ProtectionDomain protection_domain;
+			MethodBase method = stack.GetFrame(i).GetMethod();
+			if (method.DeclaringType == typeof(java.security.AccessController)
+				&& method.Name == "doPrivileged")
+			{
+				is_privileged = true;
+				java.lang.Class caller = callerID.getCallerClass();
+				protection_domain = caller == null ? null : Java_java_lang_Class.getProtectionDomain0(caller);
+			}
+			else if (Java_sun_reflect_Reflection.IsHideFromStackWalk(method))
+			{
+				continue;
+			}
+			else
+			{
+				protection_domain = GetProtectionDomainFromType(method.DeclaringType);
+			}
+
+			if (previous_protection_domain != protection_domain && protection_domain != null)
+			{
+				previous_protection_domain = protection_domain;
+				array.Add(protection_domain);
+			}
+
+			if (is_privileged)
+			{
+				return true;
+			}
+		}
+		return false;
+	}
+
+	private static object CreateAccessControlContext(List<java.security.ProtectionDomain> context, bool is_privileged, java.security.AccessControlContext privileged_context)
+	{
+		java.security.AccessControlContext acc = new java.security.AccessControlContext(context == null || context.Count == 0 ? null : context.ToArray(), is_privileged);
+		acc._privilegedContext(privileged_context);
+		return acc;
+	}
+
+	private static java.security.ProtectionDomain GetProtectionDomainFromType(Type type)
+	{
+		if (type == null
+			|| type.Assembly == typeof(object).Assembly
+			|| type.Assembly == typeof(Java_java_security_AccessController).Assembly
+			|| type.Assembly == Java_java_lang_SecurityManager.jniAssembly
+			|| type.Assembly == typeof(java.lang.Thread).Assembly)
+		{
+			return null;
+		}
+		TypeWrapper tw = ClassLoaderWrapper.GetWrapperFromType(type);
+		if (tw != null)
+		{
+			return Java_java_lang_Class.getProtectionDomain0(tw.ClassObject);
+		}
+		return null;
+	}
+#endif
+
+	public static object getInheritedAccessControlContext()
+	{
+#if FIRST_PASS
+		return null;
+#else
+		object inheritedAccessControlContext = java.lang.Thread.currentThread().inheritedAccessControlContext;
+		java.security.AccessControlContext acc = inheritedAccessControlContext as java.security.AccessControlContext;
+		if (acc != null)
+		{
+			return acc;
+		}
+		java.security.AccessController.LazyContext lc = inheritedAccessControlContext as java.security.AccessController.LazyContext;
+		if (lc == null)
+		{
+			return null;
+		}
+		List<java.security.ProtectionDomain> list = new List<java.security.ProtectionDomain>();
+		while (lc != null)
+		{
+			if (GetProtectionDomains(list, lc.callerID, lc.stackTrace))
+			{
+				return CreateAccessControlContext(list, true, lc.context);
+			}
+			lc = lc.parent;
+		}
+		return CreateAccessControlContext(list, false, null);
+#endif
+	}
+}