如何将Webcredentials从活动用户传递到Windows服务？

我需要从当前登录用户获取默认凭据并将其传递给我的Windows服务以检查互联网连接并将文件上传到Dropbox。 我不希望用户每次都确认他/她的凭据。 那么如何才能获得当前活动用户的代理设置+用户名+密码？

这是我的代码，用于检索当前用户

private static string UserName() { string userName = null; ManagementScope ms = new ManagementScope(); ObjectQuery qry = new ObjectQuery("Select * from Win32_ComputerSystem"); ManagementObjectSearcher search = new ManagementObjectSearcher(ms, qry); ManagementObjectCollection result = search.Get(); foreach (ManagementObject rec in result) userName = rec["UserName"] as string; string[] buffer = userName.Split('\\'); return buffer[1]; } 

并且此代码用于获取WindowsIdentity：

 private static WindowsIdentity GetWindowsIdentity() { string userName = UserName(); PrincipalContext ctx = new PrincipalContext(ContextType.Domain); using (UserPrincipal user = UserPrincipal.FindByIdentity(ctx, IdentityType.SamAccountName, userName) ?? UserPrincipal.FindByIdentity(UserPrincipal.Current.Context, IdentityType.UserPrincipalName, userName)) { return user == null ? null : new WindowsIdentity(user.UserPrincipalName); } } 

这是我想通过服务做的事情：

  System.Diagnostics.Debugger.Launch(); //launch debugger when service runs WindowsImpersonationContext impersonationContext; impersonationContext = GetWindowsIdentity().Impersonate(); //try to use the currently logged in user's credentials WebRequest.DefaultWebProxy.Credentials = CredentialCache.DefaultCredentials; try { WebClient wClient = new WebClient(); string xx = wClient.DownloadString(@"https://dropbox.com"); if (xx == "") //just download the sourcecode to chek if this page is available return false; } catch (Exception ex) { using (StreamWriter sw = new StreamWriter(@"C:\Users\Testuser\Desktop\DownloadError.txt", true)) { sw.WriteLine(ex.ToString()); } return false; } impersonationContext.Undo(); 

errorLog始终显示该服务无法连接。 当我从控制台或WinForms应用程序运行它时，它没有任何问题。

错误日志：

  System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it 172.217.17.238:80 at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception) --- End of inner exception stack trace --- at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) at System.Net.WebClient.DownloadString(Uri address) at System.Net.WebClient.DownloadString(String address) at BeeShotService.Sender.TrySend(String s) in C:\Users\Testuser\Documents\Visual Studio 2017\Projects\Project_BackupUploder\UploaderService\Sender.cs:Zeile 70. 

Answer 1

我已经成功解决了带有附加类的简单webRequests的问题：

 class GetProxySettings { private const int INTERNET_OPTION_PROXY = 38; [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] private static extern bool InternetQueryOption(IntPtr hInternet, uint dwOption, IntPtr lpBuffer, ref int lpdwBufferLength); /// 
 /// Access types supported by InternetOpen function. /// 
 private enum InternetOpenType { INTERNET_OPEN_TYPE_PRECONFIG = 0, INTERNET_OPEN_TYPE_DIRECT = 1, INTERNET_OPEN_TYPE_PROXY = 3, } /// 
 /// Contains information that is supplied with the INTERNET_OPTION_PROXY value /// to get or set proxy information on a handle obtained from a call to /// the InternetOpen function. /// 
 private struct INTERNET_PROXY_INFO { public InternetOpenType DwAccessType { get; set; } public string LpszProxy { get; set; } public string LpszProxyBypass { get; set; } } internal string[] GetV(WindowsIdentity windowsIdentity) { string[] settings = new string[] { "", "" }; using (windowsIdentity.Impersonate()) { int bufferLength = 0; IntPtr buffer = IntPtr.Zero; InternetQueryOption(IntPtr.Zero, INTERNET_OPTION_PROXY, IntPtr.Zero, ref bufferLength); try { buffer = Marshal.AllocHGlobal(bufferLength); if (InternetQueryOption(IntPtr.Zero, INTERNET_OPTION_PROXY, buffer, ref bufferLength)) { INTERNET_PROXY_INFO proxyInfo = (INTERNET_PROXY_INFO) // Converting structure to IntPtr. Marshal.PtrToStructure(buffer, typeof(INTERNET_PROXY_INFO)); // Getting the proxy details. settings[0] = proxyInfo.LpszProxy.Split(':')[0]; settings[1] = proxyInfo.LpszProxy.Split(':')[1]; } } catch { } } return settings; } } 

您需要添加当前登录用户的WindowsIdentity，并返回带有[0] = proxystring＆[1] =代理端口的字符串[]。 以下适用于服务：

  WebClient wClient = new WebClient(); wClient.Proxy = new WebProxy( GetProxySettings.GetV(GetWindowsIdentity())[0],GetProxySettings.GetV(GetWindowsIdentity())[1]); string xx = wClient.DownloadString(@"https://www.dropbox.com");