|
//------------------------------------------------------------------------------
// <copyright file="DefaultProxySection.cs" company="Microsoft Corporation">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
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 Microsoft.
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;
}
}
|