365 lines
9.8 KiB
C#
365 lines
9.8 KiB
C#
//
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// System.Security.Permissions.EnvironmentPermission.cs
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//
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// Authors:
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// Tim Coleman <tim@timcoleman.com>
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// Sebastien Pouliot <sebastien@ximian.com>
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//
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// Copyright (C) 2002, Tim Coleman
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// Portions Copyright (C) 2003 Motus Technologies (http://www.motus.com)
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// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Collections;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace System.Security.Permissions {
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[ComVisible (true)]
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[Serializable]
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public sealed class EnvironmentPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
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#region Fields
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private const int version = 1;
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// EnvironmentPermissionAccess flags;
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PermissionState _state;
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ArrayList readList;
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ArrayList writeList;
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#endregion // Fields
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#region Constructors
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public EnvironmentPermission (PermissionState state) : base ()
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{
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_state = CheckPermissionState (state, true);
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readList = new ArrayList ();
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writeList = new ArrayList ();
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}
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public EnvironmentPermission (EnvironmentPermissionAccess flag, string pathList) : base ()
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{
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readList = new ArrayList ();
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writeList = new ArrayList ();
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SetPathList (flag, pathList);
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}
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#endregion // Constructors
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#region Methods
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public void AddPathList (EnvironmentPermissionAccess flag, string pathList)
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{
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if (pathList == null)
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throw new ArgumentNullException ("pathList");
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string[] paths;
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switch (flag) {
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case EnvironmentPermissionAccess.AllAccess:
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paths = pathList.Split (';');
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foreach (string path in paths) {
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if (!readList.Contains (path))
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readList.Add (path);
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if (!writeList.Contains (path))
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writeList.Add (path);
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}
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break;
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case EnvironmentPermissionAccess.NoAccess:
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// ??? unit tests doesn't show removal using NoAccess ???
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break;
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case EnvironmentPermissionAccess.Read:
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paths = pathList.Split (';');
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foreach (string path in paths) {
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if (!readList.Contains (path))
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readList.Add (path);
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}
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break;
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case EnvironmentPermissionAccess.Write:
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paths = pathList.Split (';');
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foreach (string path in paths) {
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if (!writeList.Contains (path))
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writeList.Add (path);
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}
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break;
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default:
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ThrowInvalidFlag (flag, false);
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break;
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}
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}
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public override IPermission Copy ()
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{
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EnvironmentPermission ep = new EnvironmentPermission (_state);
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string path = GetPathList (EnvironmentPermissionAccess.Read);
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if (path != null)
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ep.SetPathList (EnvironmentPermissionAccess.Read, path);
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path = GetPathList (EnvironmentPermissionAccess.Write);
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if (path != null)
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ep.SetPathList (EnvironmentPermissionAccess.Write, path);
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return ep;
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}
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public override void FromXml (SecurityElement esd)
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{
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// General validation in CodeAccessPermission
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CheckSecurityElement (esd, "esd", version, version);
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// Note: we do not (yet) care about the return value
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// as we only accept version 1 (min/max values)
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if (IsUnrestricted (esd))
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_state = PermissionState.Unrestricted;
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string read = esd.Attribute ("Read");
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if ((read != null) && (read.Length > 0))
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SetPathList (EnvironmentPermissionAccess.Read, read);
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string write = esd.Attribute ("Write");
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if ((write != null) && (write.Length > 0))
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SetPathList (EnvironmentPermissionAccess.Write, write);
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}
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public string GetPathList (EnvironmentPermissionAccess flag)
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{
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switch (flag) {
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case EnvironmentPermissionAccess.AllAccess:
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case EnvironmentPermissionAccess.NoAccess:
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ThrowInvalidFlag (flag, true);
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break;
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case EnvironmentPermissionAccess.Read:
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return GetPathList (readList);
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case EnvironmentPermissionAccess.Write:
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return GetPathList (writeList);
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default:
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ThrowInvalidFlag (flag, false);
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break;
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}
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return null; // never reached
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}
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public override IPermission Intersect (IPermission target)
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{
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EnvironmentPermission ep = Cast (target);
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if (ep == null)
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return null;
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if (IsUnrestricted ())
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return ep.Copy ();
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if (ep.IsUnrestricted ())
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return Copy ();
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int n = 0;
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EnvironmentPermission result = new EnvironmentPermission (PermissionState.None);
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string readTarget = ep.GetPathList (EnvironmentPermissionAccess.Read);
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if (readTarget != null) {
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string[] targets = readTarget.Split (';');
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foreach (string t in targets) {
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if (readList.Contains (t)) {
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result.AddPathList (EnvironmentPermissionAccess.Read, t);
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n++;
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}
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}
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}
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string writeTarget = ep.GetPathList (EnvironmentPermissionAccess.Write);
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if (writeTarget != null) {
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string[] targets = writeTarget.Split (';');
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foreach (string t in targets) {
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if (writeList.Contains (t)) {
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result.AddPathList (EnvironmentPermissionAccess.Write, t);
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n++;
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}
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}
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}
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return ((n > 0) ? result : null);
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}
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public override bool IsSubsetOf (IPermission target)
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{
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EnvironmentPermission ep = Cast (target);
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if (ep == null)
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return false;
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if (IsUnrestricted ())
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return ep.IsUnrestricted ();
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else if (ep.IsUnrestricted ())
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return true;
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foreach (string s in readList) {
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if (!ep.readList.Contains (s))
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return false;
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}
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foreach (string s in writeList) {
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if (!ep.writeList.Contains (s))
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return false;
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}
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return true;
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}
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public bool IsUnrestricted ()
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{
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return (_state == PermissionState.Unrestricted);
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}
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public void SetPathList (EnvironmentPermissionAccess flag, string pathList)
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{
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if (pathList == null)
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throw new ArgumentNullException ("pathList");
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string[] paths;
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switch (flag) {
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case EnvironmentPermissionAccess.AllAccess:
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readList.Clear ();
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writeList.Clear ();
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paths = pathList.Split (';');
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foreach (string path in paths) {
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readList.Add (path);
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writeList.Add (path);
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}
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break;
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case EnvironmentPermissionAccess.NoAccess:
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// ??? unit tests doesn't show removal using NoAccess ???
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break;
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case EnvironmentPermissionAccess.Read:
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readList.Clear ();
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paths = pathList.Split (';');
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foreach (string path in paths) {
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readList.Add (path);
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}
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break;
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case EnvironmentPermissionAccess.Write:
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writeList.Clear ();
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paths = pathList.Split (';');
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foreach (string path in paths) {
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writeList.Add (path);
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}
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break;
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default:
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ThrowInvalidFlag (flag, false);
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break;
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}
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}
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public override SecurityElement ToXml ()
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{
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SecurityElement se = Element (version);
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if (_state == PermissionState.Unrestricted) {
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se.AddAttribute ("Unrestricted", "true");
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}
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else {
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string path = GetPathList (EnvironmentPermissionAccess.Read);
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if (path != null)
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se.AddAttribute ("Read", path);
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path = GetPathList (EnvironmentPermissionAccess.Write);
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if (path != null)
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se.AddAttribute ("Write", path);
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}
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return se;
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}
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public override IPermission Union (IPermission other)
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{
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EnvironmentPermission ep = Cast (other);
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if (ep == null)
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return Copy ();
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if (IsUnrestricted () || ep.IsUnrestricted ())
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return new EnvironmentPermission (PermissionState.Unrestricted);
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if (IsEmpty () && ep.IsEmpty ())
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return null;
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EnvironmentPermission result = (EnvironmentPermission) Copy ();
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string path = ep.GetPathList (EnvironmentPermissionAccess.Read);
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if (path != null)
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result.AddPathList (EnvironmentPermissionAccess.Read, path);
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path = ep.GetPathList (EnvironmentPermissionAccess.Write);
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if (path != null)
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result.AddPathList (EnvironmentPermissionAccess.Write, path);
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return result;
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}
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// IBuiltInPermission
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int IBuiltInPermission.GetTokenIndex ()
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{
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return (int) BuiltInToken.Environment;
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}
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// helpers
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private bool IsEmpty ()
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{
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return ((_state == PermissionState.None) && (readList.Count == 0) && (writeList.Count == 0));
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}
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private EnvironmentPermission Cast (IPermission target)
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{
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if (target == null)
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return null;
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EnvironmentPermission ep = (target as EnvironmentPermission);
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if (ep == null) {
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ThrowInvalidPermission (target, typeof (EnvironmentPermission));
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}
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return ep;
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}
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internal void ThrowInvalidFlag (EnvironmentPermissionAccess flag, bool context)
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{
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string msg = null;
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if (context)
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msg = Locale.GetText ("Unknown flag '{0}'.");
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else
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msg = Locale.GetText ("Invalid flag '{0}' in this context.");
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throw new ArgumentException (String.Format (msg, flag), "flag");
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}
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private string GetPathList (ArrayList list)
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{
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if (IsUnrestricted ())
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return String.Empty;
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if (list.Count == 0)
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return String.Empty;
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StringBuilder sb = new StringBuilder ();
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foreach (string path in list) {
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sb.Append (path);
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sb.Append (";");
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}
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string result = sb.ToString ();
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// remove last ';'
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int n = result.Length;
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if (n > 0)
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return result.Substring (0, n - 1);
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return String.Empty;
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}
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#endregion // Methods
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}
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}
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