关于.net2.0中Webconfig中连接串加密

2008-01-25 11:43:57　来源:互联网　作者:邀月博客点击:

ASP.NET 2.0 现在允许您对配置文件的单个节进行加密，这样，几乎不可能使用文本编辑器来读取这些配置节。

　　ASP.NET 包括两个内置的受保护配置提供程序：RSA 和 DPAPI DPAPI 提供程序使用特定于计算机的密钥，因此您必须在每台计算机上实际加密配置设置。默认使用的 RSA 提供程序允许您选择创建 RSA 密钥并将其安装在其他计算机上，这样您就可以在这些计算机之间复制相同的配置文件。此外，您还可以安装其他受保护配置提供程序供系统使用。

　　调用配置管理 API 可透明地使用加密的节，因为该 API 自动处理加密和解密。若要通过编程方式将配置节设置为加密的，可获取 ConfigurationSection.SectionInformation 属性，然后传入您选择的保护提供程序调用 ProtectSection 方法。若要使用默认提供程序，可以传入 null 或空字符串。UnprotectSection 方法禁用配置节的加密。

　　下面的示例演示如何以编程方式对配置节进行加密，配置 API 如何自动处理加密的节。

　　 <% @ Import Namespace = " System.Configuration " %>
<% @ Import Namespace = " System.Web.Configuration " %>
<% @ Import Namespace = " System.Xml " %>
< script runat ="server" language ="C#" >
public void Page_Load(object source, EventArgs e)
...{
if ( ! IsPostBack) ...{
UpdateUI();
}
}
void ProtectButton_OnClick(Object source, EventArgs e)
...{
String path = Request.CurrentExecutionFilePath;
path = path.Substring( 0 , path.LastIndexOf(' / '));
// Get configuration.
        Configuration config = WebConfigurationManager.OpenWebConfiguration(path);
ConfigurationSection appSettings = config.GetSection( " appSettings " );
if (appSettings.SectionInformation.IsProtected)
...{
appSettings.SectionInformation.UnprotectSection();
}
else
...{
appSettings.SectionInformation.ProtectSection( " DataProtectionConfigurationProvider " );
}
try
...{
config.Save();
UpdateUI();
}
catch (Exception ex)
...{
Response.Write( " In order to modify configuration settings, the ASP.NET process account (either the local ASPNET or Network Service account, by default) " );
Response.Write( " must have write permission granted for the Web.config file in the sample directory " );
}
}
void UpdateUI()
...{
String path = Request.CurrentExecutionFilePath;
path = path.Substring( 0 , path.LastIndexOf(' / '));
// Get configuration.
        Configuration config = WebConfigurationManager.OpenWebConfiguration(path);
// Show XML for app settings.
        ConfigurationSection appSettings = config.GetSection( " appSettings " );
// Set protect button appropriately.
        if (appSettings.SectionInformation.IsProtected)
...{
Encrypted.Text = " Yes " ;
ProtectButton.Text = " Unprotect " ;
}
else
...{
Encrypted.Text = " No " ;
ProtectButton.Text = " Protect " ;
}
// Show XML for app settings.
        AppSettingsXml.Text = " " + Server.HtmlEncode(appSettings.SectionInformation.GetRawXml());
// Load XML directly from config file, to show encrypted XML.

String configPath = Server.MapPath( " web.config " );
XmlDocument doc = new XmlDocument();
doc.PreserveWhitespace = true ;
doc.Load(configPath);
XmlNode appSettingsXml = doc.SelectSingleNode( " configuration/appSettings " );
AppSettingsEncrypted.Text = " " + Server.HtmlEncode(appSettingsXml.OuterXml);
}
</ script >
< html >
< head >
< title > Encrypted Configuration Sections </ title >
</ head >
< body >
< form id ="form1" runat ="server" >
< div >
< h2 > Encrypted: < asp:Label runat ="server" id ="Encrypted" /></ h2 >< asp:Button runat ="server" id ="ProtectButton" OnClick ="ProtectButton_OnClick" />
< h2 > Current XML (decrypted): </ h2 >
< pre >
< asp:Label runat ="server" ID ="AppSettingsXml" />
</ pre >
< h2 > Encrypted contents: </ h2 >
< pre >
< asp:Label runat ="server" ID ="AppSettingsEncrypted" />
</ pre >
</ div >
</ form >
</ body >
</ html >

9 7 3 1 2 4 8 :