关于.net2.0中Webconfig中连接串的加密
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**，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 **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" %> <mce: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('/')); //Getconfiguration. 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 "); } } private void UpdateUI() { String path = Request.CurrentExecutionFilePath; path = path.Substring(0, path.LastIndexOf('/')); //Getconfiguration. Configuration config = WebConfigurationManager.OpenWebConfiguration(path); //ShowXMLforappsettings. ConfigurationSection appSettings = config.GetSection("appSettings"); //Setprotectbuttonappropriately. if (appSettings.SectionInformation.IsProtected) { Encrypted.Text = "Yes"; ProtectButton.Text = "Unprotect"; } else { Encrypted.Text = "No"; ProtectButton.Text = "Protect"; } //ShowXMLforappsettings. AppSettingsXml.Text = "" + Server.HtmlEncode(appSettings.SectionInformation.GetRawXml()); //LoadXMLdirectlyfromconfigfile,toshowencryptedXML. 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); } // --></mce: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> CurrentXML(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>
对应配置文件如下：
<?xml version="1.0" encoding="utf-8" ?> <configuration> <configProtectedData/> <appSettings> <add key="currencyService" value="http://www.microsoft.com/services/currencyService.asmx " /> <add key="creditCardValidationService" value="http://www.microsoft.com/services/cc.asmx " /> </appSettings> <connectionStrings /> <system.web> <compilation debug="true"> </compilation> <authentication mode="Windows"/> </system.web> </configuration>
效果如图：