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//
// System.Security.SecurityManager.cs
//
// Authors:
// Nick Drochak(ndrochak@gol.com)
// Sebastien Pouliot <sebastien@ximian.com>
//
// (C) Nick Drochak
// Portions (C) 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.
//
#if !MOBILE
using System.Collections;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using System.Security.Policy;
using System.Text;
using Mono.Xml;
namespace System.Security {
// Must match MonoDeclSecurityActions in /mono/metadata/reflection.h
internal struct RuntimeDeclSecurityActions {
public RuntimeDeclSecurityEntry cas;
public RuntimeDeclSecurityEntry noncas;
public RuntimeDeclSecurityEntry choice;
}
[ComVisible (true)]
public static class SecurityManager {
private static object _lockObject;
private static ArrayList _hierarchy;
private static IPermission _unmanagedCode;
private static Hashtable _declsecCache;
private static PolicyLevel _level;
static SecurityManager ()
{
// lock(this) is bad
// http://msdn.microsoft.com/library/en-us/dnaskdr/html/askgui06032003.asp?frame=true
_lockObject = new object ();
}
// properties
[Obsolete]
public static bool CheckExecutionRights {
get {
return false;
}
set {
}
}
[Obsolete ("The security manager cannot be turned off on MS runtime")]
extern public static bool SecurityEnabled {
[MethodImplAttribute (MethodImplOptions.InternalCall)]
get;
[MethodImplAttribute (MethodImplOptions.InternalCall)]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
set;
}
internal static bool CheckElevatedPermissions ()
{
return true; // always true outside Moonlight
}
[Conditional ("ENABLE_SANDBOX")] //??
internal static void EnsureElevatedPermissions ()
{
// do nothing outside of Moonlight
}
// methods
// NOTE: This method doesn't show in the class library status page because
// it cannot be "found" with the StrongNameIdentityPermission for ECMA key.
// But it's there!
// FIXME works for fulltrust (empty), documentation doesn't really make sense, type wise
[MonoTODO ("CAS support is experimental (and unsupported). This method only works in FullTrust.")]
[StrongNameIdentityPermission (SecurityAction.LinkDemand, PublicKey = "0x00000000000000000400000000000000")]
public static void GetZoneAndOrigin (out ArrayList zone, out ArrayList origin)
{
zone = new ArrayList ();
origin = new ArrayList ();
}
[Obsolete]
public static bool IsGranted (IPermission perm)
{
if (perm == null)
return true;
if (!SecurityEnabled)
return true;
// - Policy driven
// - Only check the caller (no stack walk required)
// - Not affected by overrides (like Assert, Deny and PermitOnly)
// - calls IsSubsetOf even for non CAS permissions
// (i.e. it does call Demand so any code there won't be executed)
// with 2.0 identity permission are unrestrictable
return IsGranted (Assembly.GetCallingAssembly (), perm);
}
// note: in 2.0 *all* permissions (including identity permissions) support unrestricted
internal static bool IsGranted (Assembly a, IPermission perm)
{
PermissionSet granted = a.GrantedPermissionSet;
if ((granted != null) && !granted.IsUnrestricted ()) {
CodeAccessPermission grant = (CodeAccessPermission) granted.GetPermission (perm.GetType ());
if (!perm.IsSubsetOf (grant)) {
return false;
}
}
PermissionSet denied = a.DeniedPermissionSet;
if ((denied != null) && !denied.IsEmpty ()) {
if (denied.IsUnrestricted ())
return false;
CodeAccessPermission refuse = (CodeAccessPermission) a.DeniedPermissionSet.GetPermission (perm.GetType ());
if ((refuse != null) && perm.IsSubsetOf (refuse))
return false;
}
return true;
}
[Obsolete]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
public static PolicyLevel LoadPolicyLevelFromFile (string path, PolicyLevelType type)
{
if (path == null)
throw new ArgumentNullException ("path");
PolicyLevel pl = null;
try {
pl = new PolicyLevel (type.ToString (), type);
pl.LoadFromFile (path);
}
catch (Exception e) {
throw new ArgumentException (Locale.GetText ("Invalid policy XML"), e);
}
return pl;
}
[Obsolete]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
public static PolicyLevel LoadPolicyLevelFromString (string str, PolicyLevelType type)
{
if (null == str)
throw new ArgumentNullException ("str");
PolicyLevel pl = null;
try {
pl = new PolicyLevel (type.ToString (), type);
pl.LoadFromString (str);
}
catch (Exception e) {
throw new ArgumentException (Locale.GetText ("Invalid policy XML"), e);
}
return pl;
}
[Obsolete]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
public static IEnumerator PolicyHierarchy ()
{
return Hierarchy;
}
[Obsolete]
public static PermissionSet ResolvePolicy (Evidence evidence)
{
// no evidence, no permission
if (evidence == null)
return new PermissionSet (PermissionState.None);
PermissionSet ps = null;
// Note: can't call PolicyHierarchy since ControlPolicy isn't required to resolve policies
IEnumerator ple = Hierarchy;
while (ple.MoveNext ()) {
PolicyLevel pl = (PolicyLevel) ple.Current;
if (ResolvePolicyLevel (ref ps, pl, evidence)) {
break; // i.e. PolicyStatementAttribute.LevelFinal
}
}
ResolveIdentityPermissions (ps, evidence);
return ps;
}
[Obsolete]
[MonoTODO ("(2.0) more tests are needed")]
public static PermissionSet ResolvePolicy (Evidence[] evidences)
{
if ((evidences == null) || (evidences.Length == 0) ||
((evidences.Length == 1) && (evidences [0].Count == 0))) {
return new PermissionSet (PermissionState.None);
}
// probably not optimal
PermissionSet ps = ResolvePolicy (evidences [0]);
for (int i=1; i < evidences.Length; i++) {
ps = ps.Intersect (ResolvePolicy (evidences [i]));
}
return ps;
}
[Obsolete]
public static PermissionSet ResolveSystemPolicy (Evidence evidence)
{
// no evidence, no permission
if (evidence == null)
return new PermissionSet (PermissionState.None);
// Note: can't call PolicyHierarchy since ControlPolicy isn't required to resolve policies
PermissionSet ps = null;
IEnumerator ple = Hierarchy;
while (ple.MoveNext ()) {
PolicyLevel pl = (PolicyLevel) ple.Current;
if (pl.Type == PolicyLevelType.AppDomain)
break;
if (ResolvePolicyLevel (ref ps, pl, evidence))
break; // i.e. PolicyStatementAttribute.LevelFinal
}
ResolveIdentityPermissions (ps, evidence);
return ps;
}
static private SecurityPermission _execution = new SecurityPermission (SecurityPermissionFlag.Execution);
[Obsolete]
public static PermissionSet ResolvePolicy (Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, out PermissionSet denied)
{
PermissionSet resolved = ResolvePolicy (evidence);
// do we have the minimal permission requested by the assembly ?
if ((reqdPset != null) && !reqdPset.IsSubsetOf (resolved)) {
throw new PolicyException (Locale.GetText (
"Policy doesn't grant the minimal permissions required to execute the assembly."));
}
// do we check for execution rights ?
if (CheckExecutionRights) {
bool execute = false;
// an empty permissionset doesn't include Execution
if (resolved != null) {
// unless we have "Full Trust"...
if (resolved.IsUnrestricted ()) {
execute = true;
} else {
// ... we need to find a SecurityPermission
IPermission security = resolved.GetPermission (typeof (SecurityPermission));
execute = _execution.IsSubsetOf (security);
}
}
if (!execute) {
throw new PolicyException (Locale.GetText (
"Policy doesn't grant the right to execute the assembly."));
}
}
denied = denyPset;
return resolved;
}
[Obsolete]
public static IEnumerator ResolvePolicyGroups (Evidence evidence)
{
if (evidence == null)
throw new ArgumentNullException ("evidence");
ArrayList al = new ArrayList ();
// Note: can't call PolicyHierarchy since ControlPolicy isn't required to resolve policies
IEnumerator ple = Hierarchy;
while (ple.MoveNext ()) {
PolicyLevel pl = (PolicyLevel) ple.Current;
CodeGroup cg = pl.ResolveMatchingCodeGroups (evidence);
al.Add (cg);
}
return al.GetEnumerator ();
}
[Obsolete]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
public static void SavePolicy ()
{
IEnumerator e = Hierarchy;
while (e.MoveNext ()) {
PolicyLevel level = (e.Current as PolicyLevel);
level.Save ();
}
}
[Obsolete]
[SecurityPermission (SecurityAction.Demand, ControlPolicy = true)]
public static void SavePolicyLevel (PolicyLevel level)
{
// Yes this will throw a NullReferenceException, just like MS (see FDBK13121)
level.Save ();
}
// private/internal stuff
private static IEnumerator Hierarchy {
get {
lock (_lockObject) {
if (_hierarchy == null)
InitializePolicyHierarchy ();
}
return _hierarchy.GetEnumerator ();
}
}
private static void InitializePolicyHierarchy ()
{
string machinePolicyPath = Path.GetDirectoryName (Environment.GetMachineConfigPath ());
// note: use InternalGetFolderPath to avoid recursive policy initialization
string userPolicyPath = Path.Combine (Environment.UnixGetFolderPath (Environment.SpecialFolder.ApplicationData, Environment.SpecialFolderOption.Create), "mono");
PolicyLevel enterprise = new PolicyLevel ("Enterprise", PolicyLevelType.Enterprise);
_level = enterprise;
enterprise.LoadFromFile (Path.Combine (machinePolicyPath, "enterprisesec.config"));
PolicyLevel machine = new PolicyLevel ("Machine", PolicyLevelType.Machine);
_level = machine;
machine.LoadFromFile (Path.Combine (machinePolicyPath, "security.config"));
PolicyLevel user = new PolicyLevel ("User", PolicyLevelType.User);
_level = user;
user.LoadFromFile (Path.Combine (userPolicyPath, "security.config"));
ArrayList al = new ArrayList ();
al.Add (enterprise);
al.Add (machine);
al.Add (user);
_hierarchy = ArrayList.Synchronized (al);
_level = null;
}
internal static bool ResolvePolicyLevel (ref PermissionSet ps, PolicyLevel pl, Evidence evidence)
{
PolicyStatement pst = pl.Resolve (evidence);
if (pst != null) {
if (ps == null) {
// only for initial (first) policy level processed
ps = pst.PermissionSet;
} else {
ps = ps.Intersect (pst.PermissionSet);
if (ps == null) {
// null is equals to None - exist that null can throw NullReferenceException ;-)
ps = new PermissionSet (PermissionState.None);
}
}
if ((pst.Attributes & PolicyStatementAttribute.LevelFinal) == PolicyStatementAttribute.LevelFinal)
return true;
}
return false;
}
internal static void ResolveIdentityPermissions (PermissionSet ps, Evidence evidence)
{
// in 2.0 identity permissions can now be unrestricted
if (ps.IsUnrestricted ())
return;
// Only host evidence are used for policy resolution
IEnumerator ee = evidence.GetHostEnumerator ();
while (ee.MoveNext ()) {
IIdentityPermissionFactory ipf = (ee.Current as IIdentityPermissionFactory);
if (ipf != null) {
IPermission p = ipf.CreateIdentityPermission (evidence);
ps.AddPermission (p);
}
}
}
internal static PolicyLevel ResolvingPolicyLevel {
get { return _level; }
set { _level = value; }
}
internal static PermissionSet Decode (IntPtr permissions, int length)
{
// Permission sets from the runtime (declarative security) can be cached
// for performance as they can never change (i.e. they are read-only).
PermissionSet ps = null;
lock (_lockObject) {
if (_declsecCache == null) {
_declsecCache = new Hashtable ();
}
object key = (object) (int) permissions;
ps = (PermissionSet) _declsecCache [key];
if (ps == null) {
// create permissionset and add it to the cache
byte[] data = new byte [length];
Marshal.Copy (permissions, data, 0, length);
ps = Decode (data);
ps.DeclarativeSecurity = true;
_declsecCache.Add (key, ps);
}
}
return ps;
}
internal static PermissionSet Decode (byte[] encodedPermissions)
{
if ((encodedPermissions == null) || (encodedPermissions.Length < 1))
throw new SecurityException ("Invalid metadata format.");
switch (encodedPermissions [0]) {
case 60:
// Fx 1.0/1.1 declarative security permissions metadata is in Unicode-encoded XML
string xml = Encoding.Unicode.GetString (encodedPermissions);
return new PermissionSet (xml);
case 0x2E:
// Fx 2.0 are encoded "somewhat, but not enough, like" custom attributes
// note: we still support the older format!
return PermissionSet.CreateFromBinaryFormat (encodedPermissions);
default:
throw new SecurityException (Locale.GetText ("Unknown metadata format."));
}
}
private static IPermission UnmanagedCode {
get {
lock (_lockObject) {
if (_unmanagedCode == null)
_unmanagedCode = new SecurityPermission (SecurityPermissionFlag.UnmanagedCode);
}
return _unmanagedCode;
}
}
// called by the runtime when CoreCLR is enabled
private static void ThrowException (Exception ex)
{
throw ex;
}
#pragma warning restore 169
public static PermissionSet GetStandardSandbox (Evidence evidence)
{
if (evidence == null)
throw new ArgumentNullException ("evidence");
throw new NotImplementedException ();
}
public static bool CurrentThreadRequiresSecurityContextCapture ()
{
throw new NotImplementedException ();
}
}
}
#endif
|