//
// System.Security.PermissionSet.cs
//
// Authors:
// Nick Drochak(ndrochak@gol.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) Nick Drochak
// Portions (C) 2003, 2004 Motus Technologies Inc. (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.Diagnostics;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Security.Permissions;
using System.Security.Policy;
using System.Text;
using System.Threading;
namespace System.Security{
[Serializable]
// Microsoft public key - i.e. only MS signed assembly can inherit from PermissionSet (1.x) or (2.0) FullTrust assemblies
[StrongNameIdentityPermission (SecurityAction.InheritanceDemand, PublicKey="002400000480000094000000060200000024000052534131000400000100010007D1FA57C4AED9F0A32E84AA0FAEFD0DE9E8FD6AEC8F87FB03766C834C99921EB23BE79AD9D5DCC1DD9AD236132102900B723CF980957FC4E177108FC607774F29E8320E92EA05ECE4E821C0A5EFE8F1645C4C0C93C1AB99285D622CAA652C1DFAD63D745D6F2DE5F17E5EAF0FC4963D261C8A12436518206DC093344D5AD293")]
[ComVisible (true)]
[MonoTODO ("CAS support is experimental (and unsupported).")]
public class PermissionSet: ISecurityEncodable, ICollection, IEnumerable, IStackWalk, IDeserializationCallback {
private const string tagName = "PermissionSet";
private const int version = 1;
private static object[] psUnrestricted = new object [1] { PermissionState.Unrestricted };
private PermissionState state;
private ArrayList list;
private PolicyLevel _policyLevel;
private bool _declsec;
private bool _readOnly;
private bool[] _ignored; // for asserts and non-CAS permissions
// constructors
// for PolicyLevel (to avoid validation duplication)
internal PermissionSet ()
{
list = new ArrayList ();
}
public PermissionSet (PermissionState state) : this ()
{
this.state = CodeAccessPermission.CheckPermissionState (state, true);
}
public PermissionSet (PermissionSet permSet) : this ()
{
// LAMESPEC: This would be handled by the compiler. No way permSet is not a PermissionSet.
//if (!(permSet is PermissionSet))
// throw new System.ArgumentException(); // permSet is not an instance of System.Security.PermissionSet.
if (permSet != null) {
state = permSet.state;
foreach (IPermission p in permSet.list)
list.Add (p);
}
}
internal PermissionSet (string xml)
: this ()
{
state = PermissionState.None;
if (xml != null) {
SecurityElement se = SecurityElement.FromString (xml);
FromXml (se);
}
}
// Light version for creating a (non unrestricted) PermissionSet with
// a single permission. This allows to relax most validations.
internal PermissionSet (IPermission perm)
: this ()
{
if (perm != null) {
// note: we do not copy IPermission like AddPermission
list.Add (perm);
}
}
// methods
public IPermission AddPermission (IPermission perm)
{
if ((perm == null) || _readOnly)
return perm;
// we don't add to an unrestricted permission set unless...
if (state == PermissionState.Unrestricted) {
// identity permissions can be unrestricted under 2.x
{
// we return the union of the permission with unrestricted
// which results in a permission of the same type initialized
// with PermissionState.Unrestricted
return (IPermission) Activator.CreateInstance (perm.GetType (), psUnrestricted);
}
}
// we can't add two permissions of the same type in a set
// so we remove an existing one, union with it and add it back
IPermission existing = RemovePermission (perm.GetType ());
if (existing != null) {
perm = perm.Union (existing);
}
// note: Add doesn't copy
list.Add (perm);
return perm;
}
[MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
[SecurityPermission (SecurityAction.Demand, Assertion = true)]
public void Assert ()
{
int count = this.Count;
// we (current frame) must have the permission to assert it to others
// otherwise we don't assert (but we don't throw an exception)
foreach (IPermission p in list) {
// note: we ignore non-CAS permissions
if (p is IStackWalk) {
if (!SecurityManager.IsGranted (p)) {
return;
}
} else
count--;
}
// note: we must ignore the stack modifiers for the non-CAS permissions
if (SecurityManager.SecurityEnabled && (count > 0))
throw new NotSupportedException ("Currently only declarative Assert are supported.");
}
internal void Clear ()
{
list.Clear ();
}
public virtual PermissionSet Copy ()
{
return new PermissionSet (this);
}
public virtual void CopyTo (Array array, int index)
{
if (null == array)
throw new ArgumentNullException ("array");
if (list.Count > 0) {
if (array.Rank > 1) {
throw new ArgumentException (Locale.GetText (
"Array has more than one dimension"));
}
if (index < 0 || index >= array.Length) {
throw new IndexOutOfRangeException ("index");
}
list.CopyTo (array, index);
}
}
public void Demand ()
{
// Note: SecurityEnabled only applies to CAS permissions
// so we're not checking for it (yet)
if (IsEmpty ())
return;
int n = list.Count;
if ((_ignored == null) || (_ignored.Length != n)) {
_ignored = new bool [n];
}
bool call_cas_only = this.IsUnrestricted ();
// non CAS permissions (e.g. PrincipalPermission) do not requires a stack walk
for (int i = 0; i < n; i++) {
IPermission p = (IPermission) list [i];
Type t = p.GetType ();
if (t.IsSubclassOf (typeof (CodeAccessPermission))) {
_ignored [i] = false;
call_cas_only = true;
} else {
_ignored [i] = true;
p.Demand ();
}
}
// don't start the stack walk if
// - the permission set only contains non CAS permissions; or
// - security isn't enabled (applis only to CAS!)
if (call_cas_only && SecurityManager.SecurityEnabled)
CasOnlyDemand (_declsec ? 5 : 3);
}
// The number of frames to skip depends on who's calling
// - CodeAccessPermission.Demand (imperative)
// - PermissionSet.Demand (imperative)
// - SecurityManager.InternalDemand (declarative)
internal void CasOnlyDemand (int skip)
{
Assembly current = null;
AppDomain domain = null;
if (_ignored == null) {
// special case when directly called from CodeAccessPermission.Demand
_ignored = new bool [list.Count];
}
ArrayList frames = SecurityFrame.GetStack (skip);
if ((frames != null) && (frames.Count > 0)) {
SecurityFrame first = ((SecurityFrame) frames [0]);
current = first.Assembly;
domain = first.Domain;
// skip ourself, Demand and other security runtime methods
foreach (SecurityFrame sf in frames) {
if (ProcessFrame (sf, ref current, ref domain)) {
if (AllIgnored ())
return; // reached Assert
}
}
SecurityFrame last = ((SecurityFrame) frames [frames.Count - 1]);
CheckAssembly (current, last);
CheckAppDomain (domain, last);
}
// Is there a CompressedStack to handle ?
CompressedStack stack = Thread.CurrentThread.GetCompressedStack ();
if ((stack != null) && !stack.IsEmpty ()) {
foreach (SecurityFrame frame in stack.List) {
if (ProcessFrame (frame, ref current, ref domain)) {
if (AllIgnored ())
return; // reached Assert
}
}
}
}
[MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public void Deny ()
{
if (!SecurityManager.SecurityEnabled)
return;
foreach (IPermission p in list) {
// note: we ignore non-CAS permissions
if (p is IStackWalk) {
throw new NotSupportedException ("Currently only declarative Deny are supported.");
}
}
}
public virtual void FromXml (SecurityElement et)
{
if (et == null)
throw new ArgumentNullException ("et");
if (et.Tag != tagName) {
string msg = String.Format ("Invalid tag {0} expected {1}", et.Tag, tagName);
throw new ArgumentException (msg, "et");
}
list.Clear ();
if (CodeAccessPermission.IsUnrestricted (et)) {
state = PermissionState.Unrestricted;
// no need to continue for an unrestricted permission
// because identity permissions now "supports" unrestricted
return;
} else {
state = PermissionState.None;
}
if (et.Children != null) {
foreach (SecurityElement se in et.Children) {
string className = se.Attribute ("class");
if (className == null) {
throw new ArgumentException (Locale.GetText (
"No permission class is specified."));
}
if (Resolver != null) {
// policy class names do not have to be fully qualified
className = Resolver.ResolveClassName (className);
}
list.Add (PermissionBuilder.Create (className, se));
}
}
}
public IEnumerator GetEnumerator ()
{
return list.GetEnumerator ();
}
public bool IsSubsetOf (PermissionSet target)
{
// if target is empty we must be empty too
if ((target == null) || (target.IsEmpty ()))
return this.IsEmpty ();
// all permissions support unrestricted in 2.0
if (target.IsUnrestricted ())
return true;
if (this.IsUnrestricted ())
return false;
if (this.IsUnrestricted () && ((target == null) || !target.IsUnrestricted ()))
return false;
// if each of our permission is (a) present and (b) a subset of target
foreach (IPermission p in list) {
// non CAS permissions must be evaluated for unrestricted
Type t = p.GetType ();
IPermission i = null;
if (target.IsUnrestricted () && (p is CodeAccessPermission) && (p is IUnrestrictedPermission)) {
i = (IPermission) Activator.CreateInstance (t, psUnrestricted);
} else {
i = target.GetPermission (t);
}
if (!p.IsSubsetOf (i))
return false; // not a subset (condition b)
}
return true;
}
[MonoTODO ("CAS support is experimental (and unsupported). Imperative mode is not implemented.")]
public void PermitOnly ()
{
if (!SecurityManager.SecurityEnabled)
return;
foreach (IPermission p in list) {
// note: we ignore non-CAS permissions
if (p is IStackWalk) {
throw new NotSupportedException ("Currently only declarative Deny are supported.");
}
}
}
public bool ContainsNonCodeAccessPermissions ()
{
if (list.Count > 0) {
foreach (IPermission p in list) {
if (! p.GetType ().IsSubclassOf (typeof (CodeAccessPermission)))
return true;
}
}
return false;
}
// FIXME little documentation in Fx 2.0 beta 1
public static byte[] ConvertPermissionSet (string inFormat, byte[] inData, string outFormat)
{
if (inFormat == null)
throw new ArgumentNullException ("inFormat");
if (outFormat == null)
throw new ArgumentNullException ("outFormat");
if (inData == null)
return null;
if (inFormat == outFormat)
return inData;
PermissionSet ps = null;
if (inFormat == "BINARY") {
if (outFormat.StartsWith ("XML")) {
using (MemoryStream ms = new MemoryStream (inData)) {
BinaryFormatter formatter = new BinaryFormatter ();
ps = (PermissionSet) formatter.Deserialize (ms);
ms.Close ();
}
string xml = ps.ToString ();
switch (outFormat) {
case "XML":
case "XMLASCII":
return Encoding.ASCII.GetBytes (xml);
case "XMLUNICODE":
return Encoding.Unicode.GetBytes (xml);
}
}
}
else if (inFormat.StartsWith ("XML")) {
if (outFormat == "BINARY") {
string xml = null;
switch (inFormat) {
case "XML":
case "XMLASCII":
xml = Encoding.ASCII.GetString (inData);
break;
case "XMLUNICODE":
xml = Encoding.Unicode.GetString (inData);
break;
}
if (xml != null) {
ps = new PermissionSet (PermissionState.None);
ps.FromXml (SecurityElement.FromString (xml));
MemoryStream ms = new MemoryStream ();
BinaryFormatter formatter = new BinaryFormatter ();
formatter.Serialize (ms, ps);
ms.Close ();
return ms.ToArray ();
}
}
else if (outFormat.StartsWith ("XML")) {
string msg = String.Format (Locale.GetText ("Can't convert from {0} to {1}"), inFormat, outFormat);
throw new XmlSyntaxException (msg);
}
}
else {
// unknown inFormat, returns null
return null;
}
// unknown outFormat, throw
throw new SerializationException (String.Format (Locale.GetText ("Unknown output format {0}."), outFormat));
}
public IPermission GetPermission (Type permClass)
{
if ((permClass == null) || (list.Count == 0))
return null;
foreach (object o in list) {
if ((o != null) && o.GetType ().Equals (permClass))
return (IPermission) o;
}
// it's normal to return null for unrestricted sets
return null;
}
public PermissionSet Intersect (PermissionSet other)
{
// no intersection possible
if ((other == null) || (other.IsEmpty ()) || (this.IsEmpty ()))
return null;
PermissionState state = PermissionState.None;
if (this.IsUnrestricted () && other.IsUnrestricted ())
state = PermissionState.Unrestricted;
PermissionSet interSet = null;
// much simpler with 2.0
if (state == PermissionState.Unrestricted) {
interSet = new PermissionSet (state);
} else if (this.IsUnrestricted ()) {
interSet = other.Copy ();
} else if (other.IsUnrestricted ()) {
interSet = this.Copy ();
} else {
interSet = new PermissionSet (state);
InternalIntersect (interSet, this, other, false);
}
return interSet;
}
internal void InternalIntersect (PermissionSet intersect, PermissionSet a, PermissionSet b, bool unrestricted)
{
foreach (IPermission p in b.list) {
// for every type in both list
IPermission i = a.GetPermission (p.GetType ());
if (i != null) {
// add intersection for this type
intersect.AddPermission (p.Intersect (i));
}
// unrestricted is possible for indentity permissions
else if (unrestricted) {
intersect.AddPermission (p);
}
// or reject!
}
}
public bool IsEmpty ()
{
// note: Unrestricted isn't empty
if (state == PermissionState.Unrestricted)
return false;
if ((list == null) || (list.Count == 0))
return true;
// the set may include some empty permissions
foreach (IPermission p in list) {
// empty == fully restricted == IsSubsetOf(null) == true
if (!p.IsSubsetOf (null))
return false;
}
return true;
}
public bool IsUnrestricted ()
{
return (state == PermissionState.Unrestricted);
}
public IPermission RemovePermission (Type permClass)
{
if ((permClass == null) || _readOnly)
return null;
foreach (object o in list) {
if (o.GetType ().Equals (permClass)) {
list.Remove (o);
return (IPermission) o;
}
}
return null;
}
public IPermission SetPermission (IPermission perm)
{
if ((perm == null) || _readOnly)
return perm;
IUnrestrictedPermission u = (perm as IUnrestrictedPermission);
if (u == null) {
state = PermissionState.None;
} else {
state = u.IsUnrestricted () ? state : PermissionState.None;
}
RemovePermission (perm.GetType ());
list.Add (perm);
return perm;
}
public override string ToString ()
{
return ToXml ().ToString ();
}
public virtual SecurityElement ToXml ()
{
SecurityElement se = new SecurityElement (tagName);
se.AddAttribute ("class", GetType ().FullName);
se.AddAttribute ("version", version.ToString ());
if (state == PermissionState.Unrestricted)
se.AddAttribute ("Unrestricted", "true");
// required for permissions that do not implement IUnrestrictedPermission
foreach (IPermission p in list) {
se.AddChild (p.ToXml ());
}
return se;
}
public PermissionSet Union (PermissionSet other)
{
if (other == null)
return this.Copy ();
PermissionSet copy = null;
if (this.IsUnrestricted () || other.IsUnrestricted ()) {
// there are no child elements in unrestricted permission sets
return new PermissionSet (PermissionState.Unrestricted);
} else {
copy = this.Copy ();
// PermissionState.None -> copy all permissions
foreach (IPermission p in other.list) {
copy.AddPermission (p);
}
}
return copy;
}
public virtual int Count {
get { return list.Count; }
}
public virtual bool IsSynchronized {
get { return list.IsSynchronized; }
}
public virtual bool IsReadOnly {
// always false (as documented) but the PermissionSet can be read-only
// e.g. in a PolicyStatement
get { return false; }
}
public virtual object SyncRoot {
get { return this; }
}
internal bool DeclarativeSecurity {
get { return _declsec; }
set { _declsec = value; }
}
[MonoTODO ("may not be required")]
void IDeserializationCallback.OnDeserialization (object sender)
{
}
[ComVisible (false)]
public override bool Equals (object obj)
{
if (obj == null)
return false;
PermissionSet ps = (obj as PermissionSet);
if (ps == null)
return false;
if (state != ps.state)
return false;
if (list.Count != ps.Count)
return false;
for (int i=0; i < list.Count; i++) {
bool found = false;
for (int j=0; i < ps.list.Count; j++) {
if (list [i].Equals (ps.list [j])) {
found = true;
break;
}
}
if (!found)
return false;
}
return true;
}
[ComVisible (false)]
public override int GetHashCode ()
{
return (list.Count == 0) ? (int) state : base.GetHashCode ();
}
// FIXME what's it doing here? There's probably a reason this was added here.
static public void RevertAssert ()
{
CodeAccessPermission.RevertAssert ();
}
// internal
internal PolicyLevel Resolver {
get { return _policyLevel; }
set { _policyLevel = value; }
}
internal void SetReadOnly (bool value)
{
_readOnly = value;
}
private bool AllIgnored ()
{
if (_ignored == null)
throw new NotSupportedException ("bad bad bad");
for (int i=0; i < _ignored.Length; i++) {
if (!_ignored [i])
return false;
}
// everything is ignored (i.e. non-CAS permission or asserted permission).
return true;
}
internal bool ProcessFrame (SecurityFrame frame, ref Assembly current, ref AppDomain domain)
{
if (IsUnrestricted ()) {
// we request unrestricted
if (frame.Deny != null) {
// but have restrictions (some denied permissions)
CodeAccessPermission.ThrowSecurityException (this, "Deny", frame, SecurityAction.Demand, null);
} else if ((frame.PermitOnly != null) && !frame.PermitOnly.IsUnrestricted ()) {
// but have restrictions (only some permitted permissions)
CodeAccessPermission.ThrowSecurityException (this, "PermitOnly", frame, SecurityAction.Demand, null);
}
}
// skip next steps if no Assert, Deny or PermitOnly are present
if (frame.HasStackModifiers) {
for (int i = 0; i < list.Count; i++) {
CodeAccessPermission cap = (CodeAccessPermission) list [i];
if (cap.ProcessFrame (frame)) {
_ignored [i] = true; // asserted
if (AllIgnored ())
return true; // no more, abort stack walk!
}
}
}
// 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).
if (frame.Assembly != current) {
CheckAssembly (current, frame);
current = frame.Assembly;
}
if (frame.Domain != domain) {
CheckAppDomain (domain, frame);
domain = frame.Domain;
}
return false;
}
internal void CheckAssembly (Assembly a, SecurityFrame frame)
{
IPermission p = SecurityManager.CheckPermissionSet (a, this, false);
if (p != null) {
CodeAccessPermission.ThrowSecurityException (this, "Demand failed assembly permissions checks.",
frame, SecurityAction.Demand, p);
}
}
internal void CheckAppDomain (AppDomain domain, SecurityFrame frame)
{
IPermission p = SecurityManager.CheckPermissionSet (domain, this);
if (p != null) {
CodeAccessPermission.ThrowSecurityException (this, "Demand failed appdomain permissions checks.",
frame, SecurityAction.Demand, p);
}
}
// 2.0 metadata format
internal static PermissionSet CreateFromBinaryFormat (byte[] data)
{
if ((data == null) || (data [0] != 0x2E) || (data.Length < 2)) {
string msg = Locale.GetText ("Invalid data in 2.0 metadata format.");
throw new SecurityException (msg);
}
int pos = 1;
int numattr = ReadEncodedInt (data, ref pos);
PermissionSet ps = new PermissionSet (PermissionState.None);
for (int i = 0; i < numattr; i++) {
IPermission p = ProcessAttribute (data, ref pos);
if (p == null) {
string msg = Locale.GetText ("Unsupported data found in 2.0 metadata format.");
throw new SecurityException (msg);
}
ps.AddPermission (p);
}
return ps;
}
internal static int ReadEncodedInt (byte[] data, ref int position)
{
int len = 0;
if ((data [position] & 0x80) == 0) {
len = data [position];
position ++;
} else if ((data [position] & 0x40) == 0) {
len = ((data [position] & 0x3f) << 8 | data [position + 1]);
position += 2;
} else {
len = (((data [position] & 0x1f) << 24) | (data [position + 1] << 16) |
(data [position + 2] << 8) | (data [position + 3]));
position += 4;
}
return len;
}
static object[] action = new object [1] { (SecurityAction) 0 };
// TODO: add support for arrays and enums (2.0)
internal static IPermission ProcessAttribute (byte[] data, ref int position)
{
int clen = ReadEncodedInt (data, ref position);
string cnam = Encoding.UTF8.GetString (data, position, clen);
position += clen;
Type secattr = Type.GetType (cnam);
SecurityAttribute sa = (Activator.CreateInstance (secattr, action) as SecurityAttribute);
if (sa == null)
return null;
/*int optionalParametersLength =*/ ReadEncodedInt (data, ref position);
int numberOfParameters = ReadEncodedInt (data, ref position);
for (int j=0; j < numberOfParameters; j++) {
bool property = false;
switch (data [position++]) {
case 0x53: // field (technically possible and working)
property = false;
break;
case 0x54: // property (common case)
property = true;
break;
default:
return null;
}
bool array = false;
byte type = data [position++];
if (type == 0x1D) {
array = true;
type = data [position++];
}
int plen = ReadEncodedInt (data, ref position);
string pnam = Encoding.UTF8.GetString (data, position, plen);
position += plen;
int arrayLength = 1;
if (array) {
arrayLength = BitConverter.ToInt32 (data, position);
position += 4;
}
object obj = null;
object[] arrayIndex = null;
for (int i = 0; i < arrayLength; i++) {
if (array) {
// TODO - setup index (2.0)
}
// sadly type values doesn't match ther TypeCode enum :(
switch (type) {
case 0x02: // MONO_TYPE_BOOLEAN
obj = (object) Convert.ToBoolean (data [position++]);
break;
case 0x03: // MONO_TYPE_CHAR
obj = (object) Convert.ToChar (data [position]);
position += 2;
break;
case 0x04: // MONO_TYPE_I1
obj = (object) Convert.ToSByte (data [position++]);
break;
case 0x05: // MONO_TYPE_U1
obj = (object) Convert.ToByte (data [position++]);
break;
case 0x06: // MONO_TYPE_I2
obj = (object) Convert.ToInt16 (data [position]);
position += 2;
break;
case 0x07: // MONO_TYPE_U2
obj = (object) Convert.ToUInt16 (data [position]);
position += 2;
break;
case 0x08: // MONO_TYPE_I4
obj = (object) Convert.ToInt32 (data [position]);
position += 4;
break;
case 0x09: // MONO_TYPE_U4
obj = (object) Convert.ToUInt32 (data [position]);
position += 4;
break;
case 0x0A: // MONO_TYPE_I8
obj = (object) Convert.ToInt64 (data [position]);
position += 8;
break;
case 0x0B: // MONO_TYPE_U8
obj = (object) Convert.ToUInt64 (data [position]);
position += 8;
break;
case 0x0C: // MONO_TYPE_R4
obj = (object) Convert.ToSingle (data [position]);
position += 4;
break;
case 0x0D: // MONO_TYPE_R8
obj = (object) Convert.ToDouble (data [position]);
position += 8;
break;
case 0x0E: // MONO_TYPE_STRING
string s = null;
if (data [position] != 0xFF) {
int slen = ReadEncodedInt (data, ref position);
s = Encoding.UTF8.GetString (data, position, slen);
position += slen;
} else {
position++;
}
obj = (object) s;
break;
case 0x50: // special for TYPE
int tlen = ReadEncodedInt (data, ref position);
obj = (object) Type.GetType (Encoding.UTF8.GetString (data, position, tlen));
position += tlen;
break;
default:
return null; // unsupported
}
if (property) {
PropertyInfo pi = secattr.GetProperty (pnam);
pi.SetValue (sa, obj, arrayIndex);
} else {
FieldInfo fi = secattr.GetField (pnam);
fi.SetValue (sa, obj);
}
}
}
return sa.CreatePermission ();
}
}
}
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