Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Permissions / SecurityPermission.cs / 1 / SecurityPermission.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // SecurityPermission.cs // namespace System.Security.Permissions { using System; using System.IO; using System.Security.Util; using System.Text; using System.Threading; using System.Runtime.Remoting; using System.Security; using System.Runtime.Serialization; using System.Reflection; using System.Globalization; [Flags, Serializable] [System.Runtime.InteropServices.ComVisible(true)] public enum SecurityPermissionFlag { NoFlags = 0x00, /* The following enum value is used in the EE (ASSERT_PERMISSION in security.cpp) * Should this value change, make corresponding changes there */ Assertion = 0x01, UnmanagedCode = 0x02, // Update vm\Security.h if you change this ! SkipVerification = 0x04, // Update vm\Security.h if you change this ! Execution = 0x08, ControlThread = 0x10, ControlEvidence = 0x20, ControlPolicy = 0x40, SerializationFormatter = 0x80, ControlDomainPolicy = 0x100, ControlPrincipal = 0x200, ControlAppDomain = 0x400, RemotingConfiguration = 0x800, Infrastructure = 0x1000, BindingRedirects = 0x2000, AllFlags = 0x3fff, } [System.Runtime.InteropServices.ComVisible(true)] [Serializable()] sealed public class SecurityPermission : CodeAccessPermission, IUnrestrictedPermission, IBuiltInPermission { private SecurityPermissionFlag m_flags; // // Public Constructors // public SecurityPermission(PermissionState state) { if (state == PermissionState.Unrestricted) { SetUnrestricted( true ); } else if (state == PermissionState.None) { SetUnrestricted( false ); Reset(); } else { throw new ArgumentException(Environment.GetResourceString("Argument_InvalidPermissionState")); } } // SecurityPermission // public SecurityPermission(SecurityPermissionFlag flag) { VerifyAccess(flag); SetUnrestricted(false); m_flags = flag; } //------------------------------------------------------ // // PRIVATE AND PROTECTED MODIFIERS // //----------------------------------------------------- private void SetUnrestricted(bool unrestricted) { if (unrestricted) { m_flags = SecurityPermissionFlag.AllFlags; } } private void Reset() { m_flags = SecurityPermissionFlag.NoFlags; } public SecurityPermissionFlag Flags { set { VerifyAccess(value); m_flags = value; } get { return m_flags; } } // // CodeAccessPermission methods // /* * IPermission interface implementation */ public override bool IsSubsetOf(IPermission target) { if (target == null) { return m_flags == 0; } SecurityPermission operand = target as SecurityPermission; if (operand != null) { return (((int)this.m_flags) & ~((int)operand.m_flags)) == 0; } else { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } } public override IPermission Union(IPermission target) { if (target == null) return(this.Copy()); if (!VerifyType(target)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } SecurityPermission sp_target = (SecurityPermission) target; if (sp_target.IsUnrestricted() || IsUnrestricted()) { return(new SecurityPermission(PermissionState.Unrestricted)); } SecurityPermissionFlag flag_union = (SecurityPermissionFlag)(m_flags | sp_target.m_flags); return(new SecurityPermission(flag_union)); } public override IPermission Intersect(IPermission target) { if (target == null) return null; else if (!VerifyType(target)) { throw new ArgumentException( String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_WrongType"), this.GetType().FullName) ); } SecurityPermission operand = (SecurityPermission)target; SecurityPermissionFlag isectFlags = SecurityPermissionFlag.NoFlags; if (operand.IsUnrestricted()) { if (this.IsUnrestricted()) return new SecurityPermission(PermissionState.Unrestricted); else isectFlags = (SecurityPermissionFlag)this.m_flags; } else if (this.IsUnrestricted()) { isectFlags = (SecurityPermissionFlag)operand.m_flags; } else { isectFlags = (SecurityPermissionFlag)m_flags & (SecurityPermissionFlag)operand.m_flags; } if (isectFlags == 0) return null; else return new SecurityPermission(isectFlags); } public override IPermission Copy() { if (IsUnrestricted()) return new SecurityPermission(PermissionState.Unrestricted); else return new SecurityPermission((SecurityPermissionFlag)m_flags); } public bool IsUnrestricted() { return m_flags == SecurityPermissionFlag.AllFlags; } private void VerifyAccess(SecurityPermissionFlag type) { if ((type & ~SecurityPermissionFlag.AllFlags) != 0) throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_EnumIllegalVal"), (int)type)); } //----------------------------------------------------- // // PUBLIC ENCODING METHODS // //----------------------------------------------------- private const String _strHeaderAssertion = "Assertion"; private const String _strHeaderUnmanagedCode = "UnmanagedCode"; private const String _strHeaderExecution = "Execution"; private const String _strHeaderSkipVerification = "SkipVerification"; private const String _strHeaderControlThread = "ControlThread"; private const String _strHeaderControlEvidence = "ControlEvidence"; private const String _strHeaderControlPolicy = "ControlPolicy"; private const String _strHeaderSerializationFormatter = "SerializationFormatter"; private const String _strHeaderControlDomainPolicy = "ControlDomainPolicy"; private const String _strHeaderControlPrincipal = "ControlPrincipal"; private const String _strHeaderControlAppDomain = "ControlAppDomain"; public override SecurityElement ToXml() { SecurityElement esd = CodeAccessPermission.CreatePermissionElement( this, "System.Security.Permissions.SecurityPermission" ); if (!IsUnrestricted()) { esd.AddAttribute( "Flags", XMLUtil.BitFieldEnumToString( typeof( SecurityPermissionFlag ), m_flags ) ); } else { esd.AddAttribute( "Unrestricted", "true" ); } return esd; } public override void FromXml(SecurityElement esd) { CodeAccessPermission.ValidateElement( esd, this ); if (XMLUtil.IsUnrestricted( esd )) { m_flags = SecurityPermissionFlag.AllFlags; return; } Reset () ; SetUnrestricted (false) ; String flags = esd.Attribute( "Flags" ); if (flags != null) m_flags = (SecurityPermissionFlag)Enum.Parse( typeof( SecurityPermissionFlag ), flags ); } // // Object Overrides // #if ZERO // Do not remove this code, usefull for debugging public override String ToString() { StringBuilder sb = new StringBuilder(); sb.Append("SecurityPermission("); if (IsUnrestricted()) { sb.Append("Unrestricted"); } else { if (GetFlag(SecurityPermissionFlag.Assertion)) sb.Append("Assertion; "); if (GetFlag(SecurityPermissionFlag.UnmanagedCode)) sb.Append("UnmangedCode; "); if (GetFlag(SecurityPermissionFlag.SkipVerification)) sb.Append("SkipVerification; "); if (GetFlag(SecurityPermissionFlag.Execution)) sb.Append("Execution; "); if (GetFlag(SecurityPermissionFlag.ControlThread)) sb.Append("ControlThread; "); if (GetFlag(SecurityPermissionFlag.ControlEvidence)) sb.Append("ControlEvidence; "); if (GetFlag(SecurityPermissionFlag.ControlPolicy)) sb.Append("ControlPolicy; "); if (GetFlag(SecurityPermissionFlag.SerializationFormatter)) sb.Append("SerializationFormatter; "); if (GetFlag(SecurityPermissionFlag.ControlDomainPolicy)) sb.Append("ControlDomainPolicy; "); if (GetFlag(SecurityPermissionFlag.ControlPrincipal)) sb.Append("ControlPrincipal; "); } sb.Append(")"); return sb.ToString(); } #endif ///int IBuiltInPermission.GetTokenIndex() { return SecurityPermission.GetTokenIndex(); } internal static int GetTokenIndex() { return BuiltInPermissionIndex.SecurityPermissionIndex; } // This can be used as a place-holder for SkipVerification permission [SecurityPermission(SecurityAction.LinkDemand, SkipVerification = true)] static internal void MethodWithSkipVerificationLinkDemand() {} } }
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