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//------------------------------------------------------------------------------
// <copyright file="ProtectedConfigurationSection.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Configuration
{
using System.Collections;
using System.Collections.Specialized;
using System.Xml;
using System.Globalization;
using System.Security.Permissions;
using System.Diagnostics.CodeAnalysis;
public sealed class ProtectedConfigurationSection : ConfigurationSection
{
internal ProtectedConfigurationProvider GetProviderFromName(string providerName)
{
ProviderSettings ps = Providers[providerName];
if (ps == null) {
throw new Exception(SR.GetString(SR.ProtectedConfigurationProvider_not_found, providerName));
}
return InstantiateProvider(ps);
}
internal ProtectedConfigurationProviderCollection GetAllProviders()
{
ProtectedConfigurationProviderCollection coll = new ProtectedConfigurationProviderCollection();
foreach(ProviderSettings ps in Providers)
{
coll.Add(InstantiateProvider(ps));
}
return coll;
}
[PermissionSet(SecurityAction.Assert, Unrestricted=true)]
[SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts", Justification = "This assert is potentially dangerous and shouldn't be present but is necessary for back-compat.")]
private ProtectedConfigurationProvider CreateAndInitializeProviderWithAssert(Type t, ProviderSettings pn) {
ProtectedConfigurationProvider provider = (ProtectedConfigurationProvider)TypeUtil.CreateInstanceWithReflectionPermission(t);
NameValueCollection pars = pn.Parameters;
NameValueCollection cloneParams = new NameValueCollection(pars.Count);
foreach (string key in pars) {
cloneParams[key] = pars[key];
}
provider.Initialize(pn.Name, cloneParams);
return provider;
}
private ProtectedConfigurationProvider InstantiateProvider(ProviderSettings pn)
{
Type t = TypeUtil.GetTypeWithReflectionPermission(pn.Type, true);
if (!typeof(ProtectedConfigurationProvider).IsAssignableFrom(t)) {
throw new Exception(SR.GetString(SR.WrongType_of_Protected_provider));
}
// Needs to check APTCA bit. See VSWhidbey 429996.
if (!TypeUtil.IsTypeAllowedInConfig(t)) {
throw new Exception(SR.GetString(SR.Type_from_untrusted_assembly, t.FullName));
}
// Needs to check Assert Fulltrust in order for runtime to work. See VSWhidbey 429996.
return CreateAndInitializeProviderWithAssert(t, pn);
}
internal static string DecryptSection(string encryptedXml, ProtectedConfigurationProvider provider) {
XmlDocument doc = new XmlDocument();
doc.LoadXml(encryptedXml);
XmlNode resultNode = provider.Decrypt(doc.DocumentElement);
return resultNode.OuterXml;
}
private const string EncryptedSectionTemplate = "<{0} {1}=\"{2}\"> {3} </{0}>";
internal static string FormatEncryptedSection(string encryptedXml, string sectionName, string providerName) {
return String.Format(CultureInfo.InvariantCulture, EncryptedSectionTemplate,
sectionName, // The section to encrypt
BaseConfigurationRecord.KEYWORD_PROTECTION_PROVIDER, // protectionProvider keyword
providerName, // The provider name
encryptedXml // the encrypted xml
);
}
internal static string EncryptSection(string clearXml, ProtectedConfigurationProvider provider) {
XmlDocument xmlDocument = new XmlDocument();
xmlDocument.PreserveWhitespace = true;
xmlDocument.LoadXml(clearXml);
string sectionName = xmlDocument.DocumentElement.Name;
XmlNode encNode = provider.Encrypt(xmlDocument.DocumentElement);
return encNode.OuterXml;
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
private static ConfigurationPropertyCollection _properties;
private static readonly ConfigurationProperty _propProviders =
new ConfigurationProperty("providers",
typeof(ProtectedProviderSettings),
new ProtectedProviderSettings(),
ConfigurationPropertyOptions.None);
private static readonly ConfigurationProperty _propDefaultProvider =
new ConfigurationProperty("defaultProvider",
typeof(string),
"RsaProtectedConfigurationProvider",
null,
ConfigurationProperty.NonEmptyStringValidator,
ConfigurationPropertyOptions.None);
static ProtectedConfigurationSection()
{
// Property initialization
_properties = new ConfigurationPropertyCollection();
_properties.Add(_propProviders);
_properties.Add(_propDefaultProvider);
}
public ProtectedConfigurationSection()
{
}
protected internal override ConfigurationPropertyCollection Properties
{
get
{
return _properties;
}
}
private ProtectedProviderSettings _Providers
{
get
{
return (ProtectedProviderSettings)base[_propProviders];
}
}
[ConfigurationProperty("providers")]
public ProviderSettingsCollection Providers
{
get
{
return _Providers.Providers;
}
}
[ConfigurationProperty("defaultProvider", DefaultValue = "RsaProtectedConfigurationProvider")]
public string DefaultProvider
{
get
{
return (string)base[_propDefaultProvider];
}
set
{
base[_propDefaultProvider] = value;
}
}
}
}
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