Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Policy / FileCodeGroup.cs / 1 / FileCodeGroup.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // FileCodeGroup.cs // // Representation for code groups used for the policy mechanism. // namespace System.Security.Policy { using System; using System.Collections; using System.Globalization; using System.Security.Permissions; using System.Security.Util; using System.Runtime.Serialization; using System.Runtime.Versioning; [Serializable] [System.Runtime.InteropServices.ComVisible(true)] sealed public class FileCodeGroup : CodeGroup, IUnionSemanticCodeGroup { private FileIOPermissionAccess m_access; internal FileCodeGroup() : base() {} public FileCodeGroup(IMembershipCondition membershipCondition, FileIOPermissionAccess access) : base(membershipCondition, (PolicyStatement)null) { m_access = access; } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] public override PolicyStatement Resolve(Evidence evidence) { if (evidence == null) throw new ArgumentNullException("evidence"); if (this.MembershipCondition.Check(evidence)) { PolicyStatement thisPolicy = CalculateAssemblyPolicy(evidence); IEnumerator enumerator = this.Children.GetEnumerator(); while (enumerator.MoveNext()) { PolicyStatement childPolicy = ((CodeGroup)enumerator.Current).Resolve(evidence); if (childPolicy != null) { if (((thisPolicy.Attributes & childPolicy.Attributes) & PolicyStatementAttribute.Exclusive) == PolicyStatementAttribute.Exclusive) throw new PolicyException(Environment.GetResourceString("Policy_MultipleExclusive")); thisPolicy.GetPermissionSetNoCopy().InplaceUnion(childPolicy.GetPermissionSetNoCopy()); thisPolicy.Attributes = thisPolicy.Attributes | childPolicy.Attributes; } } return thisPolicy; } else { return null; } } ///[ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] PolicyStatement IUnionSemanticCodeGroup.InternalResolve(Evidence evidence) { if (evidence == null) throw new ArgumentNullException("evidence"); if (this.MembershipCondition.Check(evidence)) { return CalculateAssemblyPolicy(evidence); } return null; } public override CodeGroup ResolveMatchingCodeGroups(Evidence evidence) { if (evidence == null) throw new ArgumentNullException("evidence"); if (this.MembershipCondition.Check(evidence)) { CodeGroup retGroup = this.Copy(); retGroup.Children = new ArrayList(); IEnumerator enumerator = this.Children.GetEnumerator(); while (enumerator.MoveNext()) { CodeGroup matchingGroups = ((CodeGroup)enumerator.Current).ResolveMatchingCodeGroups(evidence); // If the child has a policy, we are done. if (matchingGroups != null) retGroup.AddChild(matchingGroups); } return retGroup; } else { return null; } } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] internal PolicyStatement CalculatePolicy(Url url) { URLString urlString = url.GetURLString(); if (String.Compare(urlString.Scheme, "file", StringComparison.OrdinalIgnoreCase) != 0) return null; string directory = urlString.GetDirectoryName(); PermissionSet permSet = new PermissionSet(PermissionState.None); permSet.SetPermission(new FileIOPermission(m_access, System.IO.Path.GetFullPath(directory))); return new PolicyStatement(permSet, PolicyStatementAttribute.Nothing); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] private PolicyStatement CalculateAssemblyPolicy(Evidence evidence) { PolicyStatement thisPolicy = null; IEnumerator evidenceEnumerator = evidence.GetHostEnumerator(); while (evidenceEnumerator.MoveNext()) { Url url = evidenceEnumerator.Current as Url; if (url != null) thisPolicy = CalculatePolicy(url); } if (thisPolicy == null) thisPolicy = new PolicyStatement(new PermissionSet(false), PolicyStatementAttribute.Nothing); return thisPolicy; } public override CodeGroup Copy() { FileCodeGroup group = new FileCodeGroup(this.MembershipCondition, this.m_access); group.Name = this.Name; group.Description = this.Description; IEnumerator enumerator = this.Children.GetEnumerator(); while (enumerator.MoveNext()) { group.AddChild((CodeGroup)enumerator.Current); } return group; } public override string MergeLogic { get { return Environment.GetResourceString("MergeLogic_Union"); } } public override string PermissionSetName { get { return String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("FileCodeGroup_PermissionSet"), XMLUtil.BitFieldEnumToString(typeof(FileIOPermissionAccess), m_access)); } } public override string AttributeString { get { return null; } } protected override void CreateXml(SecurityElement element, PolicyLevel level) { element.AddAttribute("Access", XMLUtil.BitFieldEnumToString(typeof(FileIOPermissionAccess), m_access)); } protected override void ParseXml(SecurityElement e, PolicyLevel level) { string access = e.Attribute("Access"); if (access != null) m_access = (FileIOPermissionAccess) Enum.Parse(typeof(FileIOPermissionAccess), access); else m_access = FileIOPermissionAccess.NoAccess; } public override bool Equals(Object o) { FileCodeGroup that = (o as FileCodeGroup); if (that != null && base.Equals(that)) { if (this.m_access == that.m_access) return true; } return false; } public override int GetHashCode() { return base.GetHashCode() + m_access.GetHashCode(); } internal override string GetTypeName() { return "System.Security.Policy.FileCodeGroup"; } } }
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