Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Net / System / Net / Configuration / DefaultProxySection.cs / 1305376 / DefaultProxySection.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net.Configuration { using System.Collections.Generic; using System.Configuration; using System.Globalization; using System.Net; using System.Reflection; using System.Threading; using System.Security; using System.Security.Permissions; using System.Security.Principal; using System.ComponentModel; public sealed class DefaultProxySection : ConfigurationSection { public DefaultProxySection() { this.properties.Add(this.bypasslist); this.properties.Add(this.module); this.properties.Add(this.proxy); this.properties.Add(this.enabled); this.properties.Add(this.useDefaultCredentials); } protected override void PostDeserialize() { // Perf optimization. If the configuration is coming from machine.config // It is safe and we don't need to check for permissions. if (EvaluationContext.IsMachineLevel) return; try { ExceptionHelper.WebPermissionUnrestricted.Demand(); } catch (Exception exception) { throw new ConfigurationErrorsException( SR.GetString(SR.net_config_section_permission, ConfigurationStrings.DefaultProxySectionName), exception); } } [ConfigurationProperty(ConfigurationStrings.BypassList)] public BypassElementCollection BypassList { get { return (BypassElementCollection)this[this.bypasslist]; } } [ConfigurationProperty(ConfigurationStrings.Module)] public ModuleElement Module { get { return (ModuleElement)this[this.module]; } } protected override ConfigurationPropertyCollection Properties { get { return this.properties; } } [ConfigurationProperty(ConfigurationStrings.Proxy)] public ProxyElement Proxy { get { return (ProxyElement)this[this.proxy]; } } [ConfigurationProperty(ConfigurationStrings.Enabled, DefaultValue = true)] public bool Enabled { get { return (bool) this[this.enabled]; } set { this[this.enabled] = value; } } [ConfigurationProperty(ConfigurationStrings.UseDefaultCredentials, DefaultValue = false)] public bool UseDefaultCredentials { get { return (bool) this[this.useDefaultCredentials]; } set { this[this.useDefaultCredentials] = value; } } ConfigurationPropertyCollection properties = new ConfigurationPropertyCollection(); readonly ConfigurationProperty bypasslist = new ConfigurationProperty(ConfigurationStrings.BypassList, typeof(BypassElementCollection), null, ConfigurationPropertyOptions.None); readonly ConfigurationProperty module = new ConfigurationProperty(ConfigurationStrings.Module, typeof(ModuleElement), null, ConfigurationPropertyOptions.None); readonly ConfigurationProperty proxy = new ConfigurationProperty(ConfigurationStrings.Proxy, typeof(ProxyElement), null, ConfigurationPropertyOptions.None); readonly ConfigurationProperty enabled = new ConfigurationProperty(ConfigurationStrings.Enabled, typeof(bool), true, ConfigurationPropertyOptions.None); readonly ConfigurationProperty useDefaultCredentials = new ConfigurationProperty(ConfigurationStrings.UseDefaultCredentials, typeof(bool), false, ConfigurationPropertyOptions.None); // This allows us to prevent parent settings (machine.config) from propegating to higher config (app.config), unless // the higher config doesn't contain the section at all. That is, overriding defaultProxy is all-or-nothing. // Template from [....]. protected override void Reset(ConfigurationElement parentElement) { // Ignore the parentElement parameter by changing it to the default settings DefaultProxySection defaultElement = new DefaultProxySection(); // Initialize the parentElement to the right set of defaults (not needed now, // but this will avoid errors in the future if SetDefaults is ever overridden in this class. // ConfigurationElement::InitializeDefault is a no-op, so you aren�t hurting perf by anything // measurable. defaultElement.InitializeDefault(); // Finally, pass it to the base class to do the �right things� base.Reset(defaultElement); } } internal sealed class DefaultProxySectionInternal { [SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.ControlPrincipal)] internal DefaultProxySectionInternal(DefaultProxySection section) { // If enabled is false, skip everything. if (!section.Enabled) { return; } // If nothing else is set, use the system default. if (section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.Unspecified && section.Proxy.ScriptLocation == null && String.IsNullOrEmpty(section.Module.Type) && section.Proxy.UseSystemDefault != ProxyElement.UseSystemDefaultValues.True && section.Proxy.ProxyAddress == null && section.Proxy.BypassOnLocal == ProxyElement.BypassOnLocalValues.Unspecified && section.BypassList.Count == 0) { // Old-style indication to turn off the proxy. if (section.Proxy.UseSystemDefault == ProxyElement.UseSystemDefaultValues.False) { this.webProxy = new EmptyWebProxy(); // Intentionally ignoring UseDefaultCredentials in this case. return; } // Suspend impersonation. try { new SecurityPermission(SecurityPermissionFlag.ControlPrincipal | SecurityPermissionFlag.UnmanagedCode).Assert(); #if !FEATURE_PAL using(WindowsIdentity.Impersonate(IntPtr.Zero)) #endif // !FEATURE_PAL { CodeAccessPermission.RevertAssert(); this.webProxy = new WebRequest.WebProxyWrapper(new WebProxy(true)); } } catch { throw; } } else { // First, check out if we are using a different module type if (!String.IsNullOrEmpty(section.Module.Type)) { Type theType = Type.GetType(section.Module.Type, true, true); if ((theType.Attributes & TypeAttributes.VisibilityMask) != TypeAttributes.Public) throw new ConfigurationErrorsException(SR.GetString(SR.net_config_proxy_module_not_public)); // verify that its of the proper type of IWebProxy if (!typeof(IWebProxy).IsAssignableFrom(theType)) { throw new InvalidCastException(SR.GetString(SR.net_invalid_cast, theType.FullName, "IWebProxy")); } this.webProxy = (IWebProxy)Activator.CreateInstance( theType, BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, // Binder new object[0], // no arguments CultureInfo.InvariantCulture ); } else if (section.Proxy.UseSystemDefault == ProxyElement.UseSystemDefaultValues.True && section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.Unspecified && section.Proxy.ScriptLocation == null) { // Suspend impersonation. This setting is deprecated but required for Everett compat. try { new SecurityPermission(SecurityPermissionFlag.ControlPrincipal | SecurityPermissionFlag.UnmanagedCode).Assert(); #if !FEATURE_PAL using(WindowsIdentity.Impersonate(IntPtr.Zero)) #endif // !FEATURE_PAL { CodeAccessPermission.RevertAssert(); this.webProxy = new WebProxy(false); } } catch { throw; } } else { this.webProxy = new WebProxy(); } WebProxy tempProxy = this.webProxy as WebProxy; if (tempProxy != null) { if (section.Proxy.AutoDetect != ProxyElement.AutoDetectValues.Unspecified) { tempProxy.AutoDetect = section.Proxy.AutoDetect == ProxyElement.AutoDetectValues.True; } if (section.Proxy.ScriptLocation != null) { tempProxy.ScriptLocation = section.Proxy.ScriptLocation; } if (section.Proxy.BypassOnLocal != ProxyElement.BypassOnLocalValues.Unspecified) { tempProxy.BypassProxyOnLocal = section.Proxy.BypassOnLocal == ProxyElement.BypassOnLocalValues.True; } if (section.Proxy.ProxyAddress != null) { tempProxy.Address = section.Proxy.ProxyAddress; } int bypassListSize = section.BypassList.Count; if (bypassListSize > 0) { string[] bypassList = new string[section.BypassList.Count]; for (int index = 0; index < bypassListSize; ++index) { bypassList[index] = section.BypassList[index].Address; } tempProxy.BypassList = bypassList; } // Wrap it if type not explicitly specified in Module. if (section.Module.Type == null) { this.webProxy = new WebRequest.WebProxyWrapper(tempProxy); } } } // Now apply UseDefaultCredentials if there's a proxy. if (this.webProxy != null && section.UseDefaultCredentials) { this.webProxy.Credentials = SystemNetworkCredential.defaultCredential; } } internal static object ClassSyncObject { get { if (classSyncObject == null) { object o = new object(); Interlocked.CompareExchange(ref classSyncObject, o, null); } return classSyncObject; } } static internal DefaultProxySectionInternal GetSection() { lock (DefaultProxySectionInternal.ClassSyncObject) { DefaultProxySection section = PrivilegedConfigurationManager.GetSection(ConfigurationStrings.DefaultProxySectionPath) as DefaultProxySection; if (section == null) return null; try { return new DefaultProxySectionInternal(section); } catch (Exception exception) { if (NclUtilities.IsFatal(exception)) throw; throw new ConfigurationErrorsException(SR.GetString(SR.net_config_proxy), exception); } } } internal IWebProxy WebProxy { get { return this.webProxy; } } private IWebProxy webProxy; private static object classSyncObject; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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