//
// System.Security.Permissions.RegistryPermission.cs
//
// Author
// Sebastien Pouliot <sebastien@ximian.com>
//
// Copyright (C) 2003 Motus Technologies. http://www.motus.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
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System.Collections;
using System.Globalization;
using System.Text;
using System.Runtime.InteropServices;
using System.Security.AccessControl;
namespace System.Security.Permissions{
[Serializable]
[ComVisible (true)]
public sealed class RegistryPermission
: CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission {
private const int version = 1;
private PermissionState _state;
// private RegistryPermissionAccess _access;
private ArrayList createList;
private ArrayList readList;
private ArrayList writeList;
// private AccessControlActions _control;
// Constructors
public RegistryPermission (PermissionState state)
{
_state = CheckPermissionState (state, true);
createList = new ArrayList ();
readList = new ArrayList ();
writeList = new ArrayList ();
}
public RegistryPermission (RegistryPermissionAccess access, string pathList)
{
_state = PermissionState.None;
createList = new ArrayList ();
readList = new ArrayList ();
writeList = new ArrayList ();
AddPathList (access, pathList);
}
public RegistryPermission (RegistryPermissionAccess access, AccessControlActions control, string pathList)
{
if (!Enum.IsDefined (typeof (AccessControlActions), control)) {
string msg = String.Format (Locale.GetText ("Invalid enum {0}"), control);
throw new ArgumentException (msg, "AccessControlActions");
}
_state = PermissionState.None;
AddPathList (access, control, pathList);
}
// Properties
// Methods
public void AddPathList (RegistryPermissionAccess access, string pathList)
{
if (pathList == null)
throw new ArgumentNullException ("pathList");
switch (access) {
case RegistryPermissionAccess.AllAccess:
AddWithUnionKey (createList, pathList);
AddWithUnionKey (readList, pathList);
AddWithUnionKey (writeList, pathList);
break;
case RegistryPermissionAccess.NoAccess:
// ??? unit tests doesn't show removal using NoAccess ???
break;
case RegistryPermissionAccess.Create:
AddWithUnionKey (createList, pathList);
break;
case RegistryPermissionAccess.Read:
AddWithUnionKey (readList, pathList);
break;
case RegistryPermissionAccess.Write:
AddWithUnionKey (writeList, pathList);
break;
default:
ThrowInvalidFlag (access, false);
break;
}
}
[MonoTODO ("(2.0) Access Control isn't implemented")]
public void AddPathList (RegistryPermissionAccess access, AccessControlActions control, string pathList)
{
throw new NotImplementedException ();
}
public string GetPathList (RegistryPermissionAccess access)
{
switch (access) {
case RegistryPermissionAccess.AllAccess:
case RegistryPermissionAccess.NoAccess:
ThrowInvalidFlag (access, true);
break;
case RegistryPermissionAccess.Create:
return GetPathList (createList);
case RegistryPermissionAccess.Read:
return GetPathList (readList);
case RegistryPermissionAccess.Write:
return GetPathList (writeList);
default:
ThrowInvalidFlag (access, false);
break;
}
return null; // never reached
}
public void SetPathList (RegistryPermissionAccess access, string pathList)
{
if (pathList == null)
throw new ArgumentNullException ("pathList");
string[] paths;
switch (access) {
case RegistryPermissionAccess.AllAccess:
createList.Clear ();
readList.Clear ();
writeList.Clear ();
paths = pathList.Split (';');
foreach (string path in paths) {
createList.Add (path);
readList.Add (path);
writeList.Add (path);
}
break;
case RegistryPermissionAccess.NoAccess:
// ??? unit tests doesn't show removal using NoAccess ???
break;
case RegistryPermissionAccess.Create:
createList.Clear ();
paths = pathList.Split (';');
foreach (string path in paths) {
createList.Add (path);
}
break;
case RegistryPermissionAccess.Read:
readList.Clear ();
paths = pathList.Split (';');
foreach (string path in paths) {
readList.Add (path);
}
break;
case RegistryPermissionAccess.Write:
writeList.Clear ();
paths = pathList.Split (';');
foreach (string path in paths) {
writeList.Add (path);
}
break;
default:
ThrowInvalidFlag (access, false);
break;
}
}
public override IPermission Copy ()
{
RegistryPermission rp = new RegistryPermission (_state);
string path = GetPathList (RegistryPermissionAccess.Create);
if (path != null)
rp.SetPathList (RegistryPermissionAccess.Create, path);
path = GetPathList (RegistryPermissionAccess.Read);
if (path != null)
rp.SetPathList (RegistryPermissionAccess.Read, path);
path = GetPathList (RegistryPermissionAccess.Write);
if (path != null)
rp.SetPathList (RegistryPermissionAccess.Write, path);
return rp;
}
public override void FromXml (SecurityElement esd)
{
// General validation in CodeAccessPermission
CheckSecurityElement (esd, "esd", version, version);
// Note: we do not (yet) care about the return value
// as we only accept version 1 (min/max values)
// General validation in CodeAccessPermission
CheckSecurityElement (esd, "esd", version, version);
// Note: we do not (yet) care about the return value
// as we only accept version 1 (min/max values)
if (IsUnrestricted (esd))
_state = PermissionState.Unrestricted;
string create = esd.Attribute ("Create");
if ((create != null) && (create.Length > 0))
SetPathList (RegistryPermissionAccess.Create, create);
string read = esd.Attribute ("Read");
if ((read != null) && (read.Length > 0))
SetPathList (RegistryPermissionAccess.Read, read);
string write = esd.Attribute ("Write");
if ((write != null) && (write.Length > 0))
SetPathList (RegistryPermissionAccess.Write, write);
}
public override IPermission Intersect (IPermission target)
{
RegistryPermission rp = Cast (target);
if (rp == null)
return null;
if (IsUnrestricted ())
return rp.Copy ();
if (rp.IsUnrestricted ())
return Copy ();
RegistryPermission result = new RegistryPermission (PermissionState.None);
IntersectKeys (createList, rp.createList, result.createList);
IntersectKeys (readList, rp.readList, result.readList);
IntersectKeys (writeList, rp.writeList, result.writeList);
return (result.IsEmpty () ? null : result);
}
public override bool IsSubsetOf (IPermission target)
{
RegistryPermission rp = Cast (target);
if (rp == null)
return false;
if (rp.IsEmpty ())
return IsEmpty ();
if (IsUnrestricted ())
return rp.IsUnrestricted ();
else if (rp.IsUnrestricted ())
return true;
if (!KeyIsSubsetOf (createList, rp.createList))
return false;
if (!KeyIsSubsetOf (readList, rp.readList))
return false;
if (!KeyIsSubsetOf (writeList, rp.writeList))
return false;
return true;
}
public bool IsUnrestricted ()
{
return (_state == PermissionState.Unrestricted);
}
public override SecurityElement ToXml ()
{
SecurityElement se = Element (version);
if (_state == PermissionState.Unrestricted) {
se.AddAttribute ("Unrestricted", "true");
}
else {
string path = GetPathList (RegistryPermissionAccess.Create);
if (path != null)
se.AddAttribute ("Create", path);
path = GetPathList (RegistryPermissionAccess.Read);
if (path != null)
se.AddAttribute ("Read", path);
path = GetPathList (RegistryPermissionAccess.Write);
if (path != null)
se.AddAttribute ("Write", path);
}
return se;
}
public override IPermission Union (IPermission other)
{
RegistryPermission rp = Cast (other);
if (rp == null)
return Copy ();
if (IsUnrestricted () || rp.IsUnrestricted ())
return new RegistryPermission (PermissionState.Unrestricted);
if (IsEmpty () && rp.IsEmpty ())
return null;
RegistryPermission result = (RegistryPermission) Copy ();
string path = rp.GetPathList (RegistryPermissionAccess.Create);
if (path != null)
result.AddPathList (RegistryPermissionAccess.Create, path);
path = rp.GetPathList (RegistryPermissionAccess.Read);
if (path != null)
result.AddPathList (RegistryPermissionAccess.Read, path);
path = rp.GetPathList (RegistryPermissionAccess.Write);
if (path != null)
result.AddPathList (RegistryPermissionAccess.Write, path);
return result;
}
// IBuiltInPermission
int IBuiltInPermission.GetTokenIndex ()
{
return (int) BuiltInToken.Registry;
}
// helpers
private bool IsEmpty ()
{
return ((_state == PermissionState.None) && (createList.Count == 0) &&
(readList.Count == 0) && (writeList.Count == 0));
}
private RegistryPermission Cast (IPermission target)
{
if (target == null)
return null;
RegistryPermission rp = (target as RegistryPermission);
if (rp == null) {
ThrowInvalidPermission (target, typeof (RegistryPermission));
}
return rp;
}
internal void ThrowInvalidFlag (RegistryPermissionAccess flag, bool context)
{
string msg = null;
if (context)
msg = Locale.GetText ("Unknown flag '{0}'.");
else
msg = Locale.GetText ("Invalid flag '{0}' in this context.");
throw new ArgumentException (String.Format (msg, flag), "flag");
}
private string GetPathList (ArrayList list)
{
if (IsUnrestricted ())
return String.Empty;
if (list.Count == 0)
return String.Empty;
StringBuilder sb = new StringBuilder ();
foreach (string path in list) {
sb.Append (path);
sb.Append (";");
}
string result = sb.ToString ();
// remove last ';'
int n = result.Length;
if (n > 0)
return result.Substring (0, n - 1);
return String.Empty;
}
internal bool KeyIsSubsetOf (IList local, IList target)
{
bool result = false;
foreach (string l in local) {
foreach (string t in target) {
if (l.StartsWith (t)) {
result = true;
break;
}
}
if (!result)
return false;
}
return true;
}
internal void AddWithUnionKey (IList list, string pathList)
{
string[] paths = pathList.Split (';');
foreach (string path in paths) {
int len = list.Count;
if (len == 0) {
list.Add (path);
}
else {
for (int i=0; i < len; i++) {
string s = (string) list [i];
if (s.StartsWith (path)) {
// replace (with reduced version)
list [i] = path;
}
else if (path.StartsWith (s)) {
// no need to add
}
else {
list.Add (path);
}
}
}
}
}
internal void IntersectKeys (IList local, IList target, IList result)
{
foreach (string l in local) {
foreach (string t in target) {
if (t.Length > l.Length) {
if (t.StartsWith (l))
result.Add (t);
}
else {
if (l.StartsWith (t))
result.Add (l);
}
}
}
}
}
}
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